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Construction scheme of post tensioned prestressed concrete for a project

（1） Formwork fabrication, installation and removal 1. Formwork fabrication requirements (1) The section size and length should be accurate. The setting out, assembly and overall welding of steel formwork shall be carried out on the working platform or mould. The bottom beam of the working platform shall have sufficient rigidity and stability, and the table top must be flat. The setting out and blanking of steel formwork must be accurate. Considering the influence of weld shrinkage on the length of formwork fan, the blanking length of formwork fan should be 1/1000 longer than the design length. (2) The formwork surface shall be straight, the corners shall be smooth, and the welds shall be smooth. Therefore, the formwork shall be fully welded, and the welds shall be polished. (3) The fitting of the connecting bolt holes between the die fans shall be accurate. When assembling the die fans, the relative position shall be accurate and the welds shall be smooth. After the connecting angle steel at the end of the side mold sector is bent and formed, it shall be calibrated with a unified standard template and drilled in pairs. (4) The end formwork and bottom formwork shall be flat and straight, and the position of reserved holes for prestressed reinforcement shall be accurate. The pre camber of precast beam shall be taken into consideration when making bottom formwork. 2. Formwork installation (1) Formwork installation shall be carried out in coordination with reinforcement work. Formwork that hinders reinforcement binding shall be installed after reinforcement installation. Generally, the side formwork and end formwork shall be installed after the bottom plate is flat and the reinforcement framework is installed. The end formwork can also be installed after the end formwork is installed. The formwork shall not be connected with the scaffold to avoid the deformation of the formwork caused by the transportation of materials and manual operation on the scaffold. (2) The accuracy of formwork installation shall be higher than that of precast beam. The next process can be started only after the formwork is installed and passes the acceptance. The accuracy requirements of formwork can refer to the relevant provisions of the specification. (3) In order to protect the formwork and facilitate the removal of formwork, the contact surface between formwork and concrete, the overall removal of core formwork and the contact surface between plug and concrete shall be coated with isolating agent before use. 3. The quality of formwork removal involves the quality of precast beams and the turnover of formwork. The non bearing side formwork can be removed only when the concrete strength can ensure that its surface and edges will not be damaged due to formwork removal. Generally, the side formwork can be removed only when the concrete compressive strength reaches 2.5 Mpa. The core formwork and the internal formwork of the reserved duct can be pulled out only when the concrete strength can ensure that the surface will not collapse and crack, and the pulling time can be handled according to the relevant provisions of the construction specifications.

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Post tensioned prestressed concrete construction scheme of a project - Figure 1

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This is in PDF format. I hope some technologies related to bridge construction will be useful to you
Post tensioning prestress concrete Crane beam construction
Project overview: The * * * * workshop project of * * * * Tire Co., Ltd. adopts 6m post tensioned prestressed concrete crane beam, which adopts atlas 04G426 (implementation date: March 1, 2004). The project requires a total of YDL-3:30, YDL-4:30 and YDL-7:60. The post tensioned bonded prestressed construction technology is adopted. The prestressed reinforcement is: steel strand 1 × 7-15.2-1860-GB/T5224-2003. The reserved holes of the prestressed reinforcement are embedded metal bellows. The diameter of the bellows is φ 50 for 2-3 steel strands and φ 55 for 4 steel strands.

Topic: Crane beam construction Post tensioned prestressed concrete construction Crane beam bracket
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Abstract: The article mainly introduces the concept of post tensioned prestressed concrete, the construction process of post tensioned prestressed concrete small box girder, the precautions in construction and some requirements in the operating procedures. Key words: post tensioning method; Prestress; concrete; Construction technology; Tensioning text: the post tensioning prestressed concrete construction technology refers to the construction method of pouring cement concrete first, and then tensioning prestressed steel to form prestressed concrete components after reaching more than 75% of the design strength. The specific operation steps are as follows: first, make the component, and reserve corresponding holes in the component according to the position of the prestressed reinforcement. When the concrete strength of the component reaches the specified strength (generally not less than 75% of the design strength standard value), insert the prestressed reinforcement into the reserved holes for tensioning, and anchor the tensioned prestressed reinforcement at the end of the component with anchorage devices, Depending on the anchorage device at the end of the component, the pretensioning force of the prestressed reinforcement is transmitted to the concrete, so as to produce preloading stress; Finally, grout shall be poured into the duct to make the prestressed reinforcement and concrete members form a whole.

Topic: Construction technology of post tensioning prestress Construction technology of prestressed concrete Prestressed concrete according to construction process
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Content introduction ① Construction of prefabrication yard: the prefabrication yard shall be planned first. The foundation of the slab beam base shall be treated and the surface shall be leveled and smooth with concrete, and steel plates shall be laid. The beam end base shall be strengthened. The gantry crane for hoisting shall be assembled with Bailey pieces. ② Formwork processing: The external formwork for the plate beam of this bridge is fabricated by professional formwork factory, and the panel is made of 6mm steel plate. The welding joint of one template panel shall be minimized. The horizontal stiffening of the panel adopts the horizontal and vertical stiffening of channel steel. Intermittent welds are used between the stiffener and the panel. The length of each weld is 5cm, and the weld thickness is not less than 6mm. The panel is planed. Movable steel formwork is used for internal formwork. Before using the formwork, check whether the size of each part of the formwork meets the design requirements, and pay attention to the decontamination and rust removal of the formwork surface. ③ Assembly and removal of formwork: the assembly and removal of external formwork shall be carried out by using the electric hoist of simple small gantry crane. Before the installation of formwork, the reinforcement framework and end formwork shall be installed first, and then the corrugated pipe and formwork on both sides shall be installed; The internal formwork shall be installed after the bottom concrete is poured. The removal sequence is the same as the installation sequence. The formwork shall be installed in strict accordance with the setting out to ensure accurate position and firm installation. In order to ensure that the joints of the formwork are smooth and free of mortar leakage, the following measures shall be taken: A. The joints of the formwork shall be made of hard foam liner and polished with a grinder. B、 After each formwork removal, the formwork surface shall be cleaned and applied with engine oil to ensure no rust in the next use. C、 Before formwork erection, the formwork surface shall be cleaned, dirt, dirt or rust (if any) shall be removed, and proper release agent shall be coated before formwork erection.

Topic: Post tensioned prestressed concrete hollow slab beam Construction Scheme of Post tensioned Prestressed Hollow Slab Beam Prestressed concrete hollow slab 03sg435-1
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*****The * * * workshop project of Tire Co., Ltd. adopts 6m post tensioned prestressed concrete crane beam, which adopts atlas 04G426 (implementation date: March 1, 2004). The project requires a total of YDL-3:30, YDL-4:30 and YDL-7:60. The post tensioned bonded prestressed construction technology is adopted. The prestressed reinforcement is: steel strand 1 × 7-15.2-1860-GB/T5224-2003. The reserved holes of the prestressed reinforcement are embedded metal bellows. The diameter of the bellows is φ 50 for 2-3 steel strands and φ 55 for 4 steel strands. Both the tensioning end and the anchoring end of the crane beam are equipped with QM series anchors. The models are as follows: number of steel strands (pieces): 2 3 4 Anchorage model: QM15-21860MPa QM15-31860MPa QM15-41860MPa This project has a complex process, high technical content and high construction quality requirements.

Topic: Crane beam construction Post tensioned prestressed concrete construction Crane beam bracket
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Grouting shall be carried out within 24 hours after tensioning of prestressed tendons. After the prestressed reinforcement is tensioned, the surplus part shall be removed with a portable grinder to expose the prestressed reinforcement about 5cm from the anchorage. Cement mortar shall be used to seal the anchor, and the clip and exposed steel strand head shall be completely wrapped. The thickness of the covering layer shall be more than 2cm. The mix ratio of pipe grouting cement slurry is: to be used after the report is approved. ① The machines and tools required for vacuum grouting of grouting equipment include: 1 slurry mixer, 1 slurry storage tank, 1 grouting machine, 1 vacuum pump, 1 pressure gauge, 1 batch of ball valves, several grouting pipes, 1 high-strength rubber pipe, and 1 filter. ② In the grouting process, the quality of cement paste is the key to the grouting quality control. It is mainly to reduce the water cement ratio of the slurry as much as possible, and by adding a certain proportion of water reducer and expansion agent. Before mixing the cement slurry, add water and idle for several minutes to drain the accumulated water, so that the inner wall of the mixer is fully wetted. First add a certain amount of water, then pour the mixture, and then start the mixer for mixing. After the mixture is evenly mixed (about 3min), slowly pour the cement slurry into the slurry storage tank through the filter screen. The slurry storage capacity of the slurry storage tank must be greater than the volume of cement slurry required for one pipe to ensure the continuous grouting.

Topic: Post tensioned prestressed concrete construction Specification for prestressed grouting of concrete Construction organization scheme of post tensioned prestressed bridge
Pretensioning prestress concrete Simply supported plate beam
Content introduction Before pouring concrete, prestressed reinforcement (steel wire or steel strand) shall be tensioned by equipment such as tensioning pedestal to make it reach the design stress, temporarily anchored on the pedestal, and then poured concrete. When the concrete reaches a certain strength (80% of the design mark), the prestressed reinforcement shall be loosened, The prestress is transmitted to the concrete through the bond force between the reinforcement and the concrete or through the anchorage device preset in the concrete, so that the concrete can obtain the preloading stress. The steel strands are all concentrated in the lower flange of the beam, and according to the bending moment envelope diagram, after the theoretical cut-off point of the prestressed reinforcement is extended to a certain anchorage length, part of the prestressed reinforcement is separated from the concrete by plastic pipes.

Topic: Post tensioned prestressed concrete construction prestressed concrete Pretensioned prestressed concrete hollow slab
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Combined with the actual construction, this paper analyzes the construction preparation, tensioning, tension and other aspects of pretensioned prestressed beam and slab. The so-called prestressed concrete structure is to artificially introduce the internal stress into the concrete or reinforced concrete in advance, and its value and distribution can just offset the stress generated by the service load to an appropriate degree. The process of applying prestress to prestressed concrete structures can be divided into pre tensioning and post tensioning, and then pouring concrete to form prestressed concrete components.

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This R&D center project is designed by Beijing * * Architectural Engineering Design Institute. The main structure is a frame structure, of which the beam and slab from the basement and the second floor to the roof are prestressed reinforced concrete structures. The frame beams from the basement and the second/third/fourth/fifth/sixth floors to the roof of the project adopt bonded prestressed reinforced concrete structure, and the floor adopts non prestressed structure. The prestressed reinforcement adopts high-strength low relaxation steel strand with diameter of Φ j=15.2mm and standard strength of fptk=1860MPa. Anchorage at tensioning end and fixed end shall be 3-hole group anchor clip anchorage and extrusion anchor, and single hole anchorage shall be used for unbonded prestressed reinforcement. Bonded prestressed duct is formed by galvanized flat bellows. The design grade of prestressed structure concrete strength shall not be less than C40.

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Construction Scheme for First Piece of Post tensioned Prestressed 20m Box Girder Prefabrication
XX Expressway in Shandong Province is a section from xx to xx of the national expressway network. The main line is 40.396 km long. The main line is constructed according to the expressway standard. The design speed is 100 km/h, the subgrade width is 26 m, two-way four lane, and the design load of bridges and culverts: highway - Class I. This contract section is the first contract section. The starting and ending stake numbers are K0+000-K12+268, and the total length is 12.268 km, The main works of the first contract section include 3 major bridges, 4 medium bridges, 11 culverts, 2 interchanges, 1 separation interchange, 9 passages, 12 overpasses, 1 toll station on the main line, subgrade earthwork, pavement, protection and drainage, and ancillary facilities of the median. There are 168 precast small box girders in total, including 112 simply supported continuous box girders at 25m and 56 simply supported continuous box girders at 20m. The details are as follows: (1) K3+706 separate interchange, with the central stake of K3+706. The main technical indicators of the bridge are: the clear width of the bridge deck is 11.5m, the bridge slope is 75 °, and the bridge length is 152.856m. The superstructure of the bridge type arrangement adopts (3 × 20)+(4 × 20) m fabricated prestressed concrete small box girders that are simply supported first and then continuous. There are 56 20 m box girders in the whole bridge. (2) Xx River tributary bridge, with the center stake of K5+182. The main technical indicators of the bridge are: the clear width of the bridge deck is 11.5m, the bridge slope is 110 °, and the bridge length is 132.08m. The superstructure of the bridge type is 5 × 25m prefabricated prestressed concrete small box girder, which is simply supported first and then continuous. There are 40 25 meter box girders in the whole bridge. (3) Xx River Bridge, with the center chainage of K5+452. The main technical indicators of the bridge are: the clear width of the bridge deck is 11.5m, the bridge slope is 60 °, and the bridge length is 232.08m. The superstructure of the bridge type is 9 × 25m prefabricated prestressed concrete small box girder, which is simply supported first and then continuous. There are 72 25m box girders in the whole bridge. The prestressed steel strand adopts the longitudinal prestressed steel strand with the standard value of tensile strength fpk=1860MPa, the elastic modulus Ep=1.95 × 105MPa, and the nominal diameter of 15.20mm; The longitudinal prestressed reinforcement is tensioned at both ends by post tensioning method. During tensioning, the concrete strength of box girder shall meet the design requirements (i.e. 95% of the design strength), and the concrete age shall not be less than 7 days. Phase I tendons of box girder (L=20m) shall be 3-strand, 4-strand and 5-strand steel strands, equipped with corresponding clip circular anchors, and prestressed pipes shall be circular metal bellows; Phase II negative bending moment bundle adopts 4 and 5 strands of steel strand with corresponding flat anchor. The construction scheme of the first project is applicable to L=20m fabricated prestressed concrete box girder.

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This bridge is located in Jimo City, with the central chainage of K1+905. The bridge is a 6-span 20m separated interchange, with a total length of 120m. The main line crosses a river, with an intersection angle of 60 °. This bridge is located in the right deflection curve, with a curve radius of 3387.938 and a left superelevation of 2%.

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This document is the construction scheme of prestressed concrete pipe pile project. Area A is PC-400 (80) A-C70-13, 13, with 165 piles, 26 m long, the depth of pile end into the bearing stratum ≥ 1000 mm, the design bearing capacity of a single pile is 2200KN, and the elevation of pile top is -5.380 m. Area B is PC-400 (80) A-C70-10, 11, 11, 60 piles, 32m long, the depth of pile tip into the bearing stratum ≥ 1000mm, the design bearing capacity of single pile is 2200KN, and the elevation of pile top is -5.380m.

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prestress concrete Detailed construction scheme of pipe pile works
The project is divided into three zones: Zone A is PC-400 (80) A-C70-13, 13, with 165 piles, 26 m long, the depth of pile tip into the bearing stratum ≥ 1000 mm, the design bearing capacity of single pile is 2200KN, and the elevation of pile top is -5.380 m. Zone B is PC-400 (80) A-C70-10, 11, 11, and 60 piles, 32 m long, the depth of pile tip into the bearing stratum ≥ 1000 mm, the design bearing capacity of single pile is 2200KN, and the elevation of pile top is -5.380 m. Zone C is PHC-500(100)A-C80-14、 14. 14. The number of piles is 147, the pile length is 42m, the depth of the pile end into the bearing stratum is ≥ 1000mm, the design bearing capacity of a single pile is 4000KN, and the elevation of the pile top is -6.080m.

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After the preparation of construction organization design, construction process design, process quality control design, construction safety assurance measures and emergency plan, technical personnel shall be organized to study carefully before commencement. At the same time, technicians are required to read and review the construction drawings carefully, clarify relevant technical problems in time, and be familiar with specifications and technical standards. Conduct technical disclosure to construction personnel. Pre job technical training shall be carried out for the construction personnel, and the assessment system shall be implemented.

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This project: Area A is PC-400 (80) A-C70-13, 13, with 165 piles, 26 m long, the depth of pile tip into the bearing stratum ≥ 1000 mm, the design bearing capacity of a single pile is 2200KN, and the pile top elevation is -5.380 m. Area B is PC-400 (80) A-C70-10, 11, 11, 60 piles, 32 m long, the depth of pile tip into the bearing stratum ≥ 1000 mm, the design bearing capacity of a single pile is 2200KN, and the pile top elevation is -5.380 m. Area C is PHC-500 (100) A-C80-14 14. 14. The number of piles is 147, the pile length is 42m, the depth of the pile end into the bearing stratum is ≥ 1000mm, the design bearing capacity of a single pile is 4000KN, and the elevation of the pile top is -6.080m.

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Post tensioned prestressed reinforcement concrete Method statement for prefabrication and installation of hollow slab
There are two separated flyovers in this section: Beigang Flyover and Zhongnantang Flyover, the superstructure of which adopts post tensioned prestressed reinforced concrete hollow slab. The construction of hollow slab is the key and difficult point of the two bridges. 1. Beigang Interchange is located 150m to the southeast of Beigang Village, Shaokou Township, Wan'an County. It is an overpass separation overpass on the main line. The central chainage is K154+510, with a total length of 53.04m. The superstructure is a 3-16m post tensioned prestressed reinforced concrete hollow slab with a concrete strength of 40 #. There are 20 hollow slabs arranged transversely, and there are 60 hollow slabs in the whole bridge. 2. Zhongnantang Interchange, at the entrance of Zhongnantang Village, Shaokou Township, Wan'an County, is a main line overpass. The central chainage is K160+588, and the total length is 53.04m. The superstructure is a 3-16m post tensioned prestressed reinforced concrete hollow slab with a concrete strength of 40 #. There are 20 hollow slabs arranged transversely, and there are 60 hollow slabs in the whole bridge.

Topic: Construction scheme of pretensioned precast hollow slab Advantages of precast reinforced concrete hollow slab Prefabricated reinforced concrete hollow slab plug
Post tensioning method: simple support before continuous prestress concrete Construction scheme for box girder erection

The total length of the bridge is 96m, and the total length of the bridge is 3 spans: 3X30m. The superstructure is prestressed concrete (post tensioned) box girder, which is simply supported first and then continuous. The beam height is 1.6m, and the wing plate thickness is 0.18m. The bridge deck is composed of 10 transverse beams, a total of 30 beams, including 12 edge beams and 18 center beams. The center beam weighs 87 tons, and the side beam weighs 97 tons

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Post tensioning method: simple support before continuous prestress concrete Construction scheme for box girder erection
The total length of K0+695XX Bridge is 96m, and the whole bridge has 3 spans: 3 * 30m. The superstructure is prestressed concrete (post tensioned) box girder, which is simply supported and then continuous. The beam height is 1.6m, and the wing plate thickness is 0.18m. The bridge deck is composed of 10 transverse beams, a total of 30 beams, including 12 edge beams and 18 center beams. The center beam weighs 87 tons, and the side beam weighs 97 tons.

Topic: Construction of post tensioned prestressed box girder Construction scheme of prestressed concrete box girder Construction process of post tensioned prestressed concrete
30m post tensioning prestress concrete Box girder construction technology
Taking the on-site prefabrication of 30m post tensioned prestressed concrete box girder as an example, this paper introduces the main construction technology of on-site prefabrication of box girder The fabrication, reinforcement framework and other aspects of its technology are discussed, which has a certain reference role for the prefabrication of similar components.

Topic: Technical disclosure of post tensioning prestress construction Post tensioned prestressed concrete construction Technical disclosure of concrete construction
Bonded post tensioning prestress concrete Construction process standard
The construction process standard of bonded post tensioned prestressed concrete, and the tensioning machine for applying prestress has been matched and verified and recorded. The pressure gauge has been calibrated and is within the specified inspection cycle. Test run before tensioning to check whether tensioning machines and equipment are normal and reliable, and grouting machines and tools are ready

Topic: Construction technology of bonded prestressed concrete Construction technology of post tensioning prestress Construction technology of post tensioning prestress
Prefabricated post tensioning prestress concrete Bridge construction method
Content introduction 1 Foreword With the continuous improvement and development of modern bridge construction technology, long-span and high prestressed concrete beams have been more and more widely used. As the core technology in the construction of post tensioned prestressed bridges, the tensioning construction of prestressed steel strands plays a vital role in controlling the quality of bridges. The post tensioned prestressed concrete technology is to establish prestress for concrete structures by embedding pipes, threading reinforcement, tensioning, grouting and other processes to meet the design requirements. Only accurate calculation, correct operation method and strict construction technology can achieve high construction quality. Summarize the cost construction method through engineering practice. two Construction method characteristics 2.0.1 Reliable bond between prestressed reinforcement and concrete can make prestressed reinforcement give full play to its mechanical properties and provide guarantee for the established prestress. 2.0.2 The prestressed reinforcement can be designed into a variety of curve forms according to the force requirements, so that it can meet various force requirements. 2.0.3 Prestressed concrete members have good crack resistance and deformation resistance, high durability, which can effectively reduce the section of members, save materials, save energy, and have excellent use performance. three Scope of application This method is applicable to the post tensioning hydraulic tensioning construction of prestressed concrete bridges (excluding the fabrication of components and blocks). four The process principle is to produce pre compression stress in the concrete component by tensioning the prestressed reinforcement, and grout after tensioning, so that the prestressed reinforcement can bond with the concrete reliably, give full play to the material strength and ensure the established pre compression stress better.

Topic: Post tensioned prestressed concrete construction Prestressed construction method prestressed concrete
Post tensioning prestress concrete T beam construction organization design
X Bridge is located in X County, XX City, with a total length of 190.5m. It is a 6 × 30m post tensioned prestressed concrete T-beam. The starting and ending mileage of the bridge is K1+562~K1+752.5. It is designed as an open cut expanded foundation with double cylindrical piers. The maximum height of the pier is H=17m. The foundation is located on sandstone, and the groundwater is not large. The construction scheme of manual and mechanical foundation excavation, automatic metering and mixing of concrete, combined steel formwork construction of foundation concrete, pier body integral steel formwork erection in place at one time, and concrete pump delivery of concrete shall be adopted. The construction team is the first construction team, with 26 sets of mechanical equipment and 80 people at the peak of construction. The project is planned to start on November 8, 2012, and is expected to be completed on November 8, 2013, lasting 365 days.

Topic: Post tensioned prestressed concrete construction Pre tensioned prestressed construction organization design Construction organization scheme of post tensioned prestressed bridge
Prestressed construction scheme of terminal building project (post tensioning method, bonded prestress)
The terminal engineering hall area is divided into two floors underground and four floors above the ground. The plane axis size is 496m × 154.6m. The prestressed concrete frame structure is adopted. The special distribution floors of prestressed concrete are some floors above the ground, namely - 0.200m floors, 4.450m floors, 8.200m floors, 14.200m floors and 18.850m floors (roof layer). The project adopts the form of post tensioned bonded prestress, and local secondary beams are post tensioned unbonded. The span of prestressed beam in X direction is 16m, and the span of prestressed beam in Y direction is 9m, 12m and 14m.

Topic: Pre tensioned bonded prestressed construction Post tensioned prestress construction scheme Construction scheme of unbonded prestressed water tank
Prestressed construction scheme of terminal project (post tensioning method with bonded prestress)
1. Project location: XXXX International XX is 16.8 kilometers southwest of Chengdu, and the second XX of XXXX International XX (hereinafter referred to as XXXX) is located to the south of the existing first XX (hereinafter referred to as XXXX). 2. Project division: XXXXA bid section is the hall area, which can be divided into four parts from the plane: Zone 2, Zone 3, Zone 4 and Zone 5, and each part is separated by post cast strip. The hall area is divided into two floors underground and four floors above the ground. The plane axis size is 496m × 154.6m. The prestressed concrete frame structure is adopted. The basement floor elevation is -12.45m, the reinforced concrete roof elevation is 18.90m, and the top elevation of the connected steel structure roof is 35.995m. The special distribution floors of prestressed concrete are some floors above the ground, namely - 0.200m floor, 4.450m floor, 8.200m floor, 14.200m floor and 18.850m floor (roof floor). 3. Prestressed reinforcement form: the project adopts post tensioned bonded prestressed form, and local secondary beams adopt post tensioned unbonded form. The span of prestressed beam in X direction is 16m, and the span of prestressed beam in Y direction is 9m, 12m, and 14m. Most areas are two-way prestressed beams, and some are one-way prestressed beams. Vertical back tensioning prestressed forms are set in the frame columns of H axis and 2E axis (the frame column prestressed scheme is prepared separately). According to the design requirements, the prestressed reinforcement of the project adopts 1860MPa grade, φ s15.2 low relaxation steel strand. The bonded prestressed reinforcement is divided into 5 φ s15.2~13 φ s15.2 according to different positions, and the unbonded prestressed reinforcement is 5U φ s15.2. Bonded reserved duct adopts metal bellows, and the concrete strength grade is C40. The tension end shall adopt Category I clip anchorage and its supporting anchor pad and spiral reinforcement that meet the national specifications and quality requirements, and the anchor end shall adopt extrusion anchor.

Topic: Pre tensioned bonded prestressed construction Post tensioned prestress construction scheme Construction scheme of unbonded prestressed water tank
Construction Scheme for Post tensioned Prestressed T-beam Prefabrication
5. The whole bridge has 30 spans and is divided into eight sections with a total length of 1241.2m (1244.8m in the left). The substructure of the bridge adopts solid piers with constant cross section, hollow piers with variable cross section, gravity abutment and ribbed slab abutment respectively. The foundation is expanded foundation and cast-in-place pile foundation, and the upper part is prestressed concrete simply supported first and then continuous T-beam structure.

Topic: Post tensioned prestress construction scheme Precast prestressed concrete construction scheme Failure pipe of pretensioned prestressed construction
Construction scheme for post tensioning prestress tensioning, grouting and end sealing of T-beam
This data shows that 180 prestressed T beams are designed in the whole bid section of the construction scheme for post tensioning prestressed tensioning, grouting and end sealing of T beams, including 95 40m prestressed T beams and 85 30m prestressed T beams. Negative bending moment N4280, N5280, N6240, concrete design strength is C50, prestressed reinforcement is low relaxation high-strength prestressed steel strand, nominal diameter of single steel strand is 15.20mm, nominal area of steel strand A=139mm2, standard strength Fpk=1860MPa, elastic modulus Ep=1.95 × 105MPa. ······1 Preparation basis and basis 2 Project overview 3 Construction organization 4 Construction process 5 Construction preparation 6 Prestressed tendon tensioning 7 Safety and quality measures ············ 8 pages in total

Topic: Pre tensioned prestressed tensioning construction Post tensioned prestress construction scheme Special construction scheme for prestressed tensioning
Construction Scheme for T-beam Post tensioned Prestressed Tension Grouting End Sealing
A total of 180 prestressed T beams are designed in the whole bid section, including 95 40m prestressed T beams and 85 30m prestressed T beams. Negative bending moment N4280, N5280, N6240, concrete design strength is C50, prestressed reinforcement is low relaxation high-strength prestressed steel strand, nominal diameter of single steel strand is 15.20mm, nominal area of steel strand A=139mm2, standard strength Fpk=1860MPa, elastic modulus Ep=1.95 × 105MPa. After 1000 hours, the stress relaxation rate is not more than 2.5%, and its performance complies with the provisions of the national standard of the People's Republic of China (GB/T5224-2003) Prestressed Steel Strand. Corrugated pipe hole is used, and BM15-5 anchor is used for negative bending moment of roof

Topic: Post tensioned prestress construction scheme End sealing construction scheme Failure pipe of pretensioned prestressed construction
Construction Scheme for Post tensioned Prestressed T-beam Prefabrication (Page 31)
Xx Bridge is located in Wangjiaping Village, west of Xinshao County, Hunan Province, and spans xx from northeast to southwest. The center line of the bridge is orthogonal to xx. The full width of the bridge is 26m. It is divided into two bridges separated from up and down. The distance between the two bridges is 0.5m, and each bridge is 12.75m wide. The bridge starts at K207+622.8 and ends at K208+268.8. The central stake number is K207+945.8, and the total length of the bridge is 646m. The main bridge starts at K207+955.8 and ends at K208+205.8, The total length is 250m, and the structural form is 35+3 × 60+35m prestressed concrete continuous rigid frame. The Anhua side approach bridge starts from K207+622.8 and ends at K207+955.8, with a total length of 333m. The structural form is 11 × 30m fabricated simple supported continuous prestressed concrete continuous T-beam. Shaoyang side approach bridge starts from K208+205.8 and ends at K208+268.8, with a total length of 63m, and the structural form is 2 × 30m fabricated simple supported continuous prestressed concrete continuous T-beam. The bridge site of the whole bridge is located in the straight section on the plane. The longitudinal slope of the bridge deck is two-way slope, with the longitudinal slope on both sides of 2%. The radius of the vertical curve is 54699.621m. The gradient change point is at K208+045, and the elevation of the gradient change point is 226.658m.

Topic: Post tensioned prestress construction scheme Precast prestressed concrete construction scheme Failure pipe of pretensioned prestressed construction
Construction scheme of post tensioned prestressed t-beam erection
The main content of this bid section project is K26+217 XX Bay Bridge. The total length of the bridge is 1811.5 meters. The starting stake number is K25+313.5, the ending stake number is K27+125.00, and the intersection angle is 900. The superstructure is 60 holes and 30 meters prestressed concrete fabricated continuous T beam, with six holes and one link. The whole bridge has ten links, and the structure is continuous. The prefabricated beam is 200 cm high. This bridge is located on a vertical curve with a radius of 60000 meters, and the front and rear slopes are 0.3% and - 0.3% respectively. 1~10 holes of this bridge are located on the plane circular curve section, the curve radius R=2000m, the left width of the bridge deck cross slope is - 2%, and the right width is 2%; 11~21 holes are located on the plane transition curve, of which 12~14 holes are set with superelevation transition section on the left bridge deck, the cross slope of the bridge deck is from - 2% to 2%, and the cross slope of the right bridge deck is 2% unchanged; Boreholes 22~60 are straight sections with a two-way cross slope of 2%.

Topic: Post tensioned prestress construction scheme Failure pipe of pretensioned prestressed construction Animation of post tensioned prestressed box girder construction
Prestressed post tensioning method concrete T beam reinforcement processing
Technical Conditions for Simply Supported T-Beams of Prefabricated Post tensioned Prestressed Concrete Railway Bridges TB/T3043-2005???? Code for Construction of Railway Concrete and Masonry Engineering TB10210-2001 Supplementary Standard for Constructional Quality Acceptance of Railway Concrete Engineering TJS [2005] No. 160 Specification for Welding and Acceptance of Reinforcement (JGJ18-2003)

Topic: Post tensioned prestressed concrete hollow slab beam Post tensioned prestressed concrete construction Construction process of post tensioned prestressed concrete
Post tensioned prestressed reinforcement concrete Method statement for prefabrication and installation of hollow slab
There are two separated flyovers in this section: Beigang Flyover and Zhongnantang Flyover, the superstructure of which adopts post tensioned prestressed reinforced concrete hollow slab. The construction of hollow slab is the key and difficult point of the two bridges. 1. Beigang Interchange is located 150m to the southeast of Beigang Village, Shaokou Township, Wan'an County. It is an overpass separation overpass on the main line. The central chainage is K154+510, with a total length of 53.04m. The superstructure is a 3-16m post tensioned prestressed reinforced concrete hollow slab with a concrete strength of 40 #. There are 20 hollow slabs arranged transversely, and there are 60 hollow slabs in the whole bridge. 2. Zhongnantang Interchange, at the entrance of Zhongnantang Village, Shaokou Township, Wan'an County, is a main line overpass. The central chainage is K160+588, and the total length is 53.04m. The superstructure is a 3-16m post tensioned prestressed reinforced concrete hollow slab with a concrete strength of 40 #. There are 20 hollow slabs arranged transversely, and there are 60 hollow slabs in the whole bridge.

Topic: Construction scheme of pretensioned precast hollow slab Advantages of precast reinforced concrete hollow slab Prefabricated reinforced concrete hollow slab plug
Post tensioned prestressed reinforcement concrete Method statement for prefabrication and installation of hollow slab
There are two separated flyovers in this section: Beigang Flyover and Zhongnantang Flyover, the superstructure of which adopts post tensioned prestressed reinforced concrete hollow slab. The construction of hollow slab is the key and difficult point of the two bridges.

Topic: Construction scheme of pretensioned precast hollow slab Advantages of precast reinforced concrete hollow slab Prefabricated reinforced concrete hollow slab plug
Prefabrication scheme of post tensioned prestressed hollow slab
1. The position of the steel strand duct shall meet the design requirements, the duct shall be smooth, and the anchor plate at the end shall be perpendicular to the duct center. Pre embedded metal bellows or rubber pipes can be used to pull the reserved holes. 2. Bellows are used to reserve holes, and the length of the bellows is determined by the gauge. The length of the holes and the exposed length are taken into account when calculating. ① The corrugated pipe should be a whole pipe. When joints are required, the number of joints on one pipe should not exceed two; The connecting pipe at the joint should be the same type of pipe with a higher grade, and its length should be 5-7 times of the inner diameter of the connected pipe. During connection, the angle at the joint shall not be changed, and the adhesive tape shall be wrapped tightly to prevent the cement slurry from infiltrating. ② Lay corrugated pipes according to the coordinates, and fix them with steel support (spacing of 500mm). Conduct spot welding between the guide bar and the support, and bind the corrugated pipes and the guide bar and the support firmly. Before laying the pipes, ensure that there are no sundries in the pipes. ③ Measures shall be taken at the joint between the corrugated pipe and the anchor plate to ensure that the mortar does not flow into the pipe. ④ During concrete pouring, measures shall be taken to detect the condition of the duct to prevent accidental grout leakage from blocking the duct. ⑤ The bellows shall be protected during construction, and the construction personnel shall not tread on it or knock it with tools. At the same time, the bellows shall not be electrically burned during construction. To prevent the bellows from being damaged or causing holes.

Topic: Construction scheme of pretensioned precast hollow slab Pretensioned prestressed concrete hollow slab Post tensioned prestressed concrete hollow slab beam
Prestress of some place concrete Construction scheme of pipe pile works
2. Project overview Project name: Commercial Apartment Building Project Prestressed Concrete Pipe Pile Project Construction site: XX City 2.1 Design overview Pile type: Area A is PC-400 (80) A-C70-13, 13, with 165 piles, 26 m long, the depth of the pile end into the bearing layer ≥ 1000 mm, the design bearing capacity of a single pile is 2200KN, and the pile top elevation is -5.380 m. Area B is PC-400 (80) A-C70-10, 11, 11, 60 piles, 32 m long, The depth of the pile end into the bearing stratum is ≥ 1000mm, the design bearing capacity of a single pile is 2200KN, and the elevation of the pile top is -5.380m. Area C is PHC-500 (100) A-C80-14, 14, 14, with 147 piles, 42m long. The depth of the pile end into the bearing stratum is ≥ 1000mm, the design bearing capacity of a single pile is 4000KN, and the elevation of the pile top is -6.080m. 2.2 For the geological distribution of the project, please refer to the description of XX Geotechnical Engineering Investigation Report.

Topic: Prestressed concrete pipe pile Construction scheme of phc prestressed concrete pipe pile Construction Scheme of Prestressed Pipe Pile Works