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Engineering database \ electrical engineering \ Electrical construction design \ Construction disclosure \ Organization design for technical disclosure of foundation formwork construction

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Organization design for technical disclosure of foundation formwork construction

Uploaded on: 2019-12-16 17:19:26 come from: electrical engineering / Electrical construction design / Construction disclosure

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The technical disclosure of foundation formwork construction is detailed for reference.

Organization design for technical disclosure of foundation formwork construction - Figure 1

Organization design for technical disclosure of foundation formwork construction - Figure 1

Organization design for technical disclosure of foundation formwork construction - Figure 2

Organization design for technical disclosure of foundation formwork construction - Figure 2

Organization design for technical disclosure of foundation formwork construction - Figure 3

Organization design for technical disclosure of foundation formwork construction - Figure 3

Organization design for technical disclosure of foundation formwork construction - Figure 4

Organization design for technical disclosure of foundation formwork construction - Figure 4

Organization design for technical disclosure of foundation formwork construction - Figure 5

Organization design for technical disclosure of foundation formwork construction - Figure 5

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The concrete shall be designed with multiple groups of mix proportion according to the design requirements such as strength grade, durability, raw material quality, construction technology, changes in environmental conditions, etc. The mix proportion selection experiment should be carried out in advance, leaving enough time for mix proportion adjustment

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The pile joints of this project are connected by welding. Before welding, the surface of the embedded iron parts shall be cleaned up. The gap between the upper and lower pile joints shall be tightly welded with iron shims. The welding requires symmetrical welding to reduce the bending of nodes caused by weld deformation.

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Safety technical disclosure of foundation formwork installation
A. The shear wall and column of the basement are supported with plywood formwork, which requires high strength, rigidity and stability of the formwork and support system. The inner formwork support is composed of steel pipes and fasteners, which is supported on the full scaffold, the outer side is supported on the slope of the foundation pit, and a base plate is set on the slope to spread the support force. The spacing between horizontal braces and diagonal braces is 0.9m.

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3.1 Process flow: preparatory work - erecting cushion formwork - handling pre inspection. 3.2 Cushion formwork erection: the formwork shall be erected according to the outer contour line of the cushion. The inner side of the formwork shall be straight and the joints shall be tight. The outer side of the formwork shall be reinforced with pegs. The spacing between pegs shall be less than 500 mm. A 500 mm long 50 * 100 cm square timber shall be attached to the outer side of the formwork joint and fixed firmly with two pegs.

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Construction preparation 1. Material requirements (1) Metal trunking and its accessories shall be galvanized stereotyped products. The specification and model shall meet the design requirements. The inside and outside of the trunking shall be smooth and flat without ridges, distortion, edge warping and other deformation phenomena. Product certificate and material certificate shall be provided. (2) Busbars shall be provided with factory certificates and installation technical documents. The technical documents shall include the rated voltage, rated capacity, test report and other technical data. (3) Various connectors, clamps, bolts and washers shall meet the technical requirements and be galvanized products.

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Formwork: 15 thick wood plywood formwork is used for column, 100 × 100mm wood rib, and the spacing is 400-500mm; 15 thick wood plywood formwork is used for beam and plate bottom formwork, and the thick wood square is used for formwork bedding; wood plywood formwork is used for beam formwork measurement, and steel pipe is used as the support frame system. During the formwork construction, when the span of the cantilever plate is greater than 1.0m, the construction shall be arched as per 1/200; Generally, beams with a span greater than 4m shall be arched according to 1/1000 to 3/1000. Before removing the formwork, the test strength of concrete test block shall reach 75%. However, in order to speed up the turnover of formwork, the quick removal system of formwork used in this project is shown in the figure below.

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The steel frame covered plywood formwork should be assembled with staggered joints, and the strength and stiffness of the support system should meet the requirements. The lifting ring shall be made of Grade I reinforcement. It is strictly prohibited to use cold processed reinforcement. The calculated tensile stress of the lifting ring shall not be greater than 50MPa.

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Excavators shall be used to excavate the foundation pit of the retaining wall in coordination with manual operation, and the slope ratio or corresponding support shall be set to ensure the stability of the soil pit wall. When the foundation pit seeps, drainage ditches and ponding pits shall be reserved around the base for pumping; Remove loose earth and rock, and tamp with a tamper if necessary. When the bearing capacity of the foundation pit is tested to be no less than 250kPa, the foundation can be laid with the consent of the supervising engineer

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Surveying and setting out, setting out the control axis, setting out the pile site of each pile from the set axis control point, setting out and numbering according to the designed plan of hole arrangement for mixing piles, nailing the mark that is not easy to change on the ground at the pile site (bamboo sticks are generally used on site), constructing in strict accordance with the design location, and organizing the working line of the drill according to the design requirements to avoid repeated movement.

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Technical disclosure of underground diaphragm wall construction (formwork)
124 diaphragm walls are designed for this project, which is planned to be completed in four phases. 13 diaphragm walls in the transfer section of Phase I construction; Phase II construction of 11 diaphragm walls at the east side of the intersection of Heping North Road and Luohan Road; In the third phase, 34 diaphragm walls are constructed at the east side of axis 1-3 and axis 8-25; Phase IV construction of 66 diaphragm walls at the west side of Line 1 and the knife handle section. It is planned to start construction on May 1, 2015 and complete it in the middle of April 2016.

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Technical disclosure of foundation pit retaining soil nailing wall construction (formwork)
The foundation pits of 0 # abutment, 1 # and 2 # piers of Yangbi 4 # extra large bridge were excavated. Due to the steep cross slope of the ground, the measures of pre reinforced piles+soil nailing walls between piles were adopted for reinforcement when excavating the above three piers and abutments.

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The retaining walls in this section are the retaining walls for the spoil ground of DK119+655.00-DK119+730.01 subgrade, DK119+302.02-DK119+518 subgrade, Shuangcun Tunnel and Laneway Ditch Tunnel. The spoil ground area is of medium low mountain valley landform. The vegetation on the slopes on both sides is relatively developed and the terrain cutting is not strong. The location of the retaining walls is roughly in a wide "U" shaped gully; The retaining wall is located in the middle of the gully, and its two ends are set on the hillside. The bedrock on the slope is exposed, and the gully is covered with fine breccia soil.

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The guide wall reinforced concrete is constructed in sections, each section is about 30m long, and the sectional construction joint is staggered with the diaphragm wall by more than 0.5m.

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The shear wall and column formwork of the project are supported vertically by 50 × 100 square timber with a spacing of 200, and horizontally by steel pipe Φ 12 through wall screws with a spacing of no more than 500.

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Formwork joints shall be tight without mortar leakage, and sealing measures shall be taken for joints larger than 5mm

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Before installation, check the quality of the formwork, and do not use the formwork that does not meet the quality standards.

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Formwork and support crossing roads and highways shall meet the following requirements: (1) During installation, special personnel must be assigned to guide traffic. (2) During construction, special personnel shall be assigned to check the supports and protective facilities at any time to confirm that they meet the requirements of the scheme. (3) Before construction, the formwork and support erection scheme and traffic diversion scheme shall be formulated and approved by the road traffic management department. (4) The clear height and span of formwork and support shall be determined according to the requirements of road traffic management department, and corresponding anti-collision facilities and safety signs shall be set. (5) Protective stakes and safety signs must be set around the supports on the road surface and on the side of the supports near the road surface. Warning lights must be set up in dark and at night.

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The concrete shall be designed according to the current national standard Specification for Mix Design of Ordinary Concrete (JGJ55) and the concrete strength grade, durability and workability.

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Slab joint formwork: (1) The width of slab joint is 4 cm, and 50 ㎜× 50 ㎜ square timber or angle steel can be used as the bottom formwork. For those larger than 4 cm, wood plate shall be used as the bottom formwork, and it is better to go deep into the bottom of the plate for 5~10 mm to leave a groove, so that the ceiling can be plastered with mortar for leveling after formwork removal. (2) The plate joint formwork should be supported by wood or steel pipe, or by suspender. (3) The lower part of the support shall be firmly padded with wood plates and wooden wedges, and brick pads are not allowed.

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This document is the technical disclosure of the formwork construction of the research institute project. The document includes: before the removal of the beam and slab formwork, the scaffold board should be laid on the crossbar at the appropriate part of the full scaffold (to meet the operation requirements) to meet the safety needs during the operation and prevent the removed formwork from falling directly from high places. When removing the formwork, the operator is strictly prohibited to stand directly below the removed part, and use a special crowbar to remove the beam and slab formwork. Rough construction is prohibited.

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Technical disclosure of open excavation foundation construction of culvert works
1. The allowable deviation of rebar spacing is ± 20mm. 2. The allowable deviation of the thickness of the protective layer of the reinforcement is+10mm, - 5mm 3. The reinforcement skeleton is arranged in a circular manner along the road according to its type and number 4. When arranging the reinforcement, attention should be paid to the accuracy of the center position of the reinforcement skeleton 5. The reinforcement skeleton is welded. 6. The skeleton with full-length bent reinforcement and short reinforcement needs to be welded intermittently with the upper and lower full-length straight reinforcement. The single side welding length is 10d, and the double side welding length is 5d 7 The offset of the axis of the welded joint shall not be greater than 0.1d and shall not be greater than 2mm.

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Technical disclosure of elevator foundation construction in a community
1. Selection of construction elevators There are 4 single buildings above the ground in this project, which are 1 # building (3 floors above the ground), 2 # building main building (24 floors above the ground), 2 # building podium building (3 floors above the ground), 3 # building (5 floors above the ground), and the basement is an integral geolibrary covering the basements of 1 # to 3 # buildings. Comprehensively considering the external contraction of each single external facade structure, site road layout, project construction plan and construction quantities of each discipline, it is planned that: ① one SC200/200 construction elevator will be installed on the east side of the main building (1/B-M axis~B-L axis) of Building 2 #; ② One SC100/100 material elevator is installed at the south side of Building 3 # (A-5 axis~A-6 axis); ③ Due to the small single floor area and low floor of the podium building 1 # and 2 #, no construction elevator is arranged, and the materials are transported by tower crane, unloading platform and manual; ④ The materials of the basement are transported by the originally designed ramp of the basement motor vehicles, and the personnel enter through the safe passages of each individual building. The construction elevator does not go down from the basement.

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Construction standards: Construction Drawing of New Railway Project for Wulongquan Huadu Section of Wuhan Guangzhou Passenger Dedicated Line, Supplementary Standards for Constructional Quality Acceptance of Railway Concrete Works, Interim Standards for Constructional Quality Acceptance of Bridge and Culvert Works of Passenger Dedicated Line

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Mainly prepare the technical disclosure of foundation treatment cast-in-place pile concrete pouring, reinforcement fabrication and installation construction; Technical disclosure for installation and construction of foundation cushion cap and ground beam formwork: technical disclosure for concrete construction of cushion cap and ground beam; Technical disclosure of lightning protection and grounding construction; 13 items including setting out construction technical disclosure.

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Check whether the soil quality of the base is consistent with the design requirements before pouring the concrete cushion or replacing the ash soil for backfilling; Whether the depth of the foundation pit and the sectional dimension of the foundation meet the design requirements.

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Technical disclosure of foundation safety construction
1. Before starting excavation, the safety officer must conduct technical disclosure, and the operator can only operate after correctly using safety protection articles. 2. Operators shall understand the classification of soil quality and adopt different construction methods according to different categories. 3. The excavated earthwork shall be sloped or supported according to the requirements of regulations according to the soil quality, groundwater level, excavation depth and the foundation where the excavation is located, so as to ensure that no collapse accident occurs during excavation.

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Uneven size of mortar joint: the elevation of the leather pole shall be consistent, the mortar joint shall be uniform when the corner is turned, and the small line shall be tightened when bricklaying to prevent one layer of line from loosening and one layer of line from tightening.
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Before manual excavation of pile holes, practical shaft wall support materials shall be prepared according to soil characteristics and groundwater conditions.

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Daihai Power Plant 2 × 600000 kW units are designed as two boilers. The foundation is a reinforced concrete structure, and the upper part is designed as a steel structure. The relative absolute elevation of positive and negative zero meters is 1227.00 meters. The buried depth of foundation is - 5.5 meters. The foundation form is independent foundation. Embedded bolts and shear support embedded parts are set on the upper part of the foundation. Concrete mixing pile is under the foundation. The pile head is 100mm higher than the foundation cushion. The minimum temperature in winter in Daihai area is minus 35 ℃, and the thickness of frozen soil layer is 1.6 meters. The groundwater level is -2.4m.

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Organization of technical measures for foundation construction of a power plant
Contents Chapter I Project Overview 2 Chapter II Preparation Basis 2 Chapter III Construction Preparation 3 Chapter IV Main Construction Scheme 4 Chapter V Schedule 17 Chapter VI Manpower and Machinery Arrangement 17 Chapter VII Quality Requirements 18 Chapter VIII Safety Assurance Measures 19 Section 1 Safe Construction 19 Section 2 Civilized Construction 19 Section 3 Environmental Factor Identification and Evaluation 20 Project Overview 1.1 Daihai Power Plant 2 X600000kW unit is designed as two boilers. The foundation is a reinforced concrete structure, and the upper part is designed as a steel structure. The relative absolute elevation of positive and negative zero meters is 1227.00 meters. The buried depth of foundation is - 5.5 meters. The foundation form is independent foundation. Embedded bolts and shear support embedded parts are set on the upper part of the foundation. Concrete mixing pile is under the foundation. The pile head is 100mm higher than the foundation cushion. The minimum temperature in winter in Daihai area is minus 35 ℃, and the thickness of frozen soil layer is 1.6 meters. The groundwater level is -2.4m. The main quantities of this project are shown in the following table: the material grade of the foundation column reinforcement of the foundation cushion foundation of the structure part is C15 C30 C40, the quantity is 165.76m3, 2610.424 m3, 343.833 m3, 220T, which is prepared according to 1.2 Code for Construction and Acceptance of Foundation and Foundation Engineering GBJ202-83 2.2 Code for Acceptance of Construction Quality of Concrete Structures GB50204-2002 2.3 Technical Code for Geotechnical Engineering Investigation of Fossil Fuel Power Plant DL/T5074-97 2.4 Boiler foundation construction drawing 10-F122S-T02361.1 construction drawing 10-F122S-T0247 construction preparation 3.1 Reasonable selection and arrangement of construction team and determination of personnel number. 3.2 The power supply is led from the # 7 box type transformer on site, and the water source is temporarily led from the well point precipitation, and the construction machinery and materials are arranged. 3.3 Preparation of turnover tools, templates, scaffold tubes and their accessories. 3.4 Scheme consideration, joint review of drawings, reinforcement entrustment, etc. 3.5 The control piles shall be made and set at axis 1, 3, 5, 7 and 10 and columns A, 2/A, B, C, K2, K4 and K6 respectively. 3.6 Manufacturing and installation materials of external support:

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1. Elevator shaft cushion cap and basement lane deep foundation: this part shall be constructed first, and the basement floor shall be constructed. The construction joint of the elevator shaft shall be 300mm above the root of the elevator shaft wall, and steel plate waterstop shall be set; The settlement joint shall be reserved at the opening and bicycle interface, and the rubber waterstop (replaceable) shall be used. 2. The construction joints of the basement floor are reserved. The outer wall is reserved 300 mm above the root and a steel waterstop is set around. The inner wall is set at the root of the wall. The outer wall uses a water stop split screw, and the inner wall split screw plus a sleeve, which can be reused. 3. The basement roof and concrete wall shall be poured with concrete at one time, except for the post cast strip, which shall be constructed in the last two. 4. Construction method: process flow: leveling and positioning → assembling wall formwork → installing tie rods and horizontal braces → correcting perpendicularity → quality pre inspection → concrete pouring → formwork removal.

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The technical disclosure and organization design of manual hole digging pile construction are detailed for reference.

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Technical disclosure of basement formwork construction
The elevation of the basement floor structure of the project is -5.450, the elevation of the top plate structure is -1.25m in the square area, and -0.850m in the main building area. Basement floor height: 4.60m below the main building, 4.20m in the square area. The dimensions of concrete members are as follows: the column section dimensions are 600 × 600, 600 × 800, 600 × 900, 800 × 800, 400 × 600, etc; The wall is 300 and 350 thick. The sectional dimensions of main beams are 500 × 1000, 400 × 1000, 400 × 1300, 500 × 800, 500 × 1000, 300 × 700, 300 × 800, 300 × 900, etc; The thickness of basement roof is 250 and 300 mm; The thickness of superstructure slab is 100 mm, 110 mm, etc.

Topic: Technical disclosure of formwork construction Technical disclosure of basement floor construction Technical disclosure of basement reinforcement construction

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