Special construction scheme for cast-in-place box girder of expressway ramp bridge

Uploaded on: 2020-08-02 21:45:36 come from: Road and bridge municipal administration / Road and bridge construction design / construction plan

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This special construction scheme is applicable to the construction of cast-in-place box girder project of XX interchange XX ramp bridge support in XX bid section XX of Fushouchang Hexi section of XX expressway in XX province, including quality, progress, safety, civilization, environmental protection and other aspects.

Special construction scheme for cast-in-place box girder of expressway ramp bridge - Figure 1

Special construction scheme for cast-in-place box girder of expressway ramp bridge - Figure 2

Special construction scheme for cast-in-place box girder of expressway ramp bridge - Figure 3

Special construction scheme for cast-in-place box girder of expressway ramp bridge - Figure 4

Special construction scheme for cast-in-place box girder of expressway ramp bridge - Figure 5

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expressway Construction Scheme for Cast in situ Box Girder of Interchange Ramp Bridge (Page 55)
This information is the construction scheme of cast-in-place box girder of expressway interchange ramp bridge. The cast-in-place box girder of this bridge is a prestressed concrete box continuous beam with single box and single room cross section. The first coupling beam is 1.7m high. The cross slope of the bridge deck is formed by the rotation of the top and bottom plates of the box girder. The web is designed vertically. The fourth coupling beam is 2.3m high. The cross slope of the bridge deck is formed by the rotation of the top and bottom plates of the box girder. The web is designed vertically. The thickness of the web is 45-60cm, the thickness of the top plate is 25cm, the thickness of the bottom plate is 22-40cm, the cantilever length of the box girder is 2m, the thickness of the cantilever end is 18cm, and the thickness of the cantilever root is 45cm······ 1、 Project overview II. Preparation basis and principle III, construction deployment IV, process flow chart V, construction scheme VI, construction points, key points and control methods VII, project quality assurance measures VIII, safety production, civilized construction and environmental protection assurance measures IX, construction hazard identification and prevention and control X, support emergency response plan XI, annex (construction drawing) XII Support calculation sheet ······· 55 pages in total

Topic: Construction Scheme for Expressway Interchange Construction scheme of high-speed box girder Construction Scheme for Prefabricated Box Girder of Expressway
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**The interchange D ramp bridge has a total length of 1057.595m and is divided into 12 sections. The fifth unit crosses * * expressway, where the 19 # pier of D ramp (pile diameter 1.3m, pile length 20m; column diameter 1.2m, column length 14m.) is located in the central separator of * * expressway.

Topic: Construction scheme of expressway interchange ramp Construction scheme of cast-in-place bridge crossing expressway Special safety construction scheme for expressway
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1. Weilai Expressway starts from National Highway 206 near Nanxujiada Road Village, Weifang City, and ends at Taipingzhuang East, Laiyang City, connecting Yantai with Qingdao first-class highway. The total length of the expressway is 147.737 kilometers. The project was started in December 1996 and completed and opened to traffic in July 1999. 2. Weilai Expressway is located in the central and western part of Shandong Peninsula. The terrain is a plain and hilly area. Along the line, it is dominated by denuded hills. Among the hills, there is a piedmont alluvial peneplain landform. The geological condition is good. The climate is characterized by warm temperate zone and semi humid monsoon climate in North China. The four seasons of the year are distinct: the spring is dry, and the wind is mostly dry in spring; It is warm and rainy in summer, with occasional summer drought; Autumn is mild and cool, with occasional dry or rainy weather; Winter is cold and dry with less rain and snow.

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A-B (Huangwei) Expressway is a section of C-D Highway in the national key highway planning. At the same time, it is also an important part of the "West Vertical" (Bozhou Fuyang A Anqing Dongzhi Highway) in the main framework planning of the highway in Anhui Province. It starts from Fuyang A Expressway and ends at B (Huangwei) Qianshan Expressway, with a total length of 72.287km. The expressway from A to B (Huangwei) adopts the expressway in mountainous and hilly areas. The starting point from K0+000 to K36+820 is 100km/h, and the subgrade is 26m wide; The section from K36+820 to terminal K72+200 is 80km/h, and the subgrade is 24.5m wide. The whole line is divided into 10 contract sections. This contract section is the 8th contract section, starting from YK59+340 (ZK59+300) to YK63+830 (ZK63+810), with a total length of 4.49 km.

Topic: Gas fire protection designer Construction organization design of expressway tunnel High speed construction organization design
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Examples of cost analysis of cast-in-place box girders of expressways (unit price of large package), including the cost analysis examples of cast-in-place box girders of main line bridges, separated overpasses, overpasses, ramp bridges, and steel arch box girders, are detailed and worthy of reference.

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Topic: Cast in situ box girder Support scheme of cast-in-place box girder Preloading scheme of cast-in-place box girder
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The XMLJ02 contract section of Xuming Expressway (K16+800 -- K30+705) has a total of one ramp bridge and four vehicular overpasses. This scheme is calculated and prepared based on the cast-in-place box girder of AK0+760.145 ramp bridge, and the rest K20+182.808, K21+510, K28+190, and K30+355 vehicular overpasses are constructed according to this scheme.

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Topic: Special construction scheme for cast-in-place box girder of support Construction scheme of cast-in-place box girder of expressway Special construction scheme for traffic organization safety
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Topic: Construction scheme of expressway interchange ramp Construction scheme of cast-in-place bridge crossing expressway Cast in situ construction scheme of expressway
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Overview of content: The super large bridge is located at K104+242, which is left and right separated. The left side is 25+75+130+75+3 × 25m, and the right side is 75+130+75+3 × 25m, which is a box shaped variable cross-section prestressed T-shaped continuous rigid frame bridge. The root height of the box girder is 7.5m, the mid span height is 2.6m, the box girder height is the height of the beam centerline, and the side to mid span ratio is 0.5769, This will facilitate the reasonable distribution of stress in the box girder. The height of the left and right sides are different, and the arm length is 3.5 m. During the construction, the hanging system of the hanging basket needs to be adjusted at any time. The bottom plate of the box girder changes according to R=351.659m, and the top surface of the bottom plate changes according to R=391.092m, which is based on the circular curve. The purpose of this design is to reduce the bending moment value of the pier top and reduce the main tensile stress in the main beam accordingly. The box girder is poured by hanging basket cantilever, with the maximum cantilever length of 58.5m and the maximum cantilever weight of 142.9t. According to the design construction sequence, the 0 # section is poured on the pier body bracket first, and then the cantilever is poured on both sides one by one and the prestressed tendons are tensioned. The side span is closed first, and then the middle span is closed. The whole construction process is carried out symmetrically with adjacent pouring sections. During bridge closure, the T-shaped statically determinate cantilever state of the bridge changes to the statically indeterminate state, realizing the system transformation. The concrete is centrally mixed in the mixing plant, and the HBT-60 concrete pump is used for vertical pumping for box girder construction. An 8t tower crane is arranged at the left 2 # (right 1 #) and left 3 # (right 2 #) pier posts to transport materials, small equipment, machines, etc. vertically.

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Topic: Construction Scheme of Beijing Taizhou Expressway Special construction scheme for beam formwork Special safety construction scheme for expressway
Special construction scheme for highway cast-in-situ box girder
The starting and ending mileage of Huangtian Suijiang Bridge in the 14th contract section of Erguang Expressway is K51+847.36~K52+714.54, with a total length of 867.18 meters. The plane integral section of the bridge is located on the right leaning R=4100m circular curve, the left line of the separated section is located on the left leaning R=4100m circular curve, and the right line is located on the left leaning R=4099m, R=4250m circular curve. The stake number of the junction point is K52+432.672; The longitudinal plane is located in the convex curve with R=12000 m and the straight line section with longitudinal slope i=- 2.0%.

Topic: Special scheme for highway construction Special construction scheme for cast-in-place beam construction Special scheme for reinforcement construction
Upspan expressway Overall construction organization design of cast-in-place box girder bridge
The bridge at K8+784.316 is one of the subprojects of the rural highway project from Chaganmiao Village to Honghaizi Village in Azhen Town, Ejin Horo Banner. The bridge is the reconstruction project of the bridge spanning Baotou Maoming Expressway. The motorway of the old bridge is 11 meters wide, the anti-collision railings on both sides are 0.5 meters, the slope angle=17.63 °, the span arrangement is 4 × 20, and the substructure is pile column type; One bridge shall be widened on both sides of the left and right lanes of the bridge, so that the original bridge is a median, and the widened bridges on both sides are two independent bridges. Two types of pile foundations with a diameter of 1.2/1.5 m are adopted for the new bridge pile foundation. The pile length is 25 m, and the concrete grade is C25. The abutment pile is directly bent cap. The pier is a pile group foundation connecting the cushion cap. The pier column is a 2.0 × 1.6m rectangular solid pier. To ensure the overall stability of the pier, a 1.2 × 1.2m tie beam is set at the top of the pier column. The concrete mark of the cushion cap, pier column, tie beam and bent cap is C30. The box girder is cast in situ as a whole, with a double width, single box and five chambers structure. The half width of the box girder is 23.5m, the bottom width and height of the box girder are equal, the beam height is 2.6m, the longitudinal span distribution is 17.2m+46m+17.2m, the box chamber at the end of the box girder is equipped with iron sand concrete as the counterweight, and the box girder concrete is marked as C50. The bridge deck system is 8cm C40 waterproof concrete+DPS waterproof coating+8cm asphalt mixture.

Topic: Construction scheme of cast-in-place box girder of expressway Overall construction organization design Overall construction scheme of expressway
expressway Construction diversion scheme of cast-in-place box girder of overpass bridge

Since the bridge crosses the provincial road, the normal traffic of the provincial road shall be maintained during the construction of the box girder, and safety protection is a key point. In order to speed up the construction progress and ensure the project quality, our department plans to erect the box girder support. Since the construction period of the support box girder is long, the traffic flow and safety during the construction of the box girder should be ensured. The original S338 should be diverted to the south side of No. 3 abutment to ensure the original traffic safety is the top priority. 　

Topic: flyover Construction scheme of cast-in-place box girder Cast in situ box girder
expressway Special construction scheme for manual hole digging
The contract section starts at K84+000 and ends at K91+477. There are 12 major bridges and 1 medium bridge, which can be converted into 12 integral bridges with a length of 2633.25m; 2 overpasses; There are 24 culverts along the line with a total length of 1370.9m, including 17 reinforced concrete slab culverts with a length of 912.4m and 7 reinforced concrete circular pipe culverts with a length of 458.5m. In this section, 110500 m3 concrete, 2022m bored piles, 3614m dug piles, 388 25m small box girders, 295 40m T-beams, 20 50mT beams, 1087788.5m3 total excavation (99914.2m3 rock excavation), and 95610.9m3 total filling.

Topic: Special construction scheme for manual excavation of expressway Special construction scheme for safety of expressway pier column Special construction scheme for manual track laying
expressway Special construction scheme for soft foundation replacement
The soft foundation of this section is K101+760-K101+810, the subgrade fill is 5.3m high, the surface layer is cultivated soil, soft plastic mucky silty clay, with a total thickness of 1.5~4.0m, and the replacement of permeable materials is 2.45m thick; K101+810-K102+060, The subgrade fill is 17.3m high, the surface layer is cultivated soil, soft plastic mucky silty clay, with a total thickness of 1.5-4.0m, and the replacement of permeable materials is 2.45m thick; K102+060-K102+240， The subgrade fill is 13.5m high, the surface layer is cultivated soil, soft plastic mucky silty clay, with a total thickness of 1.0~2.2m, and the replacement of permeable materials is 1.3m thick.

Topic: Special construction scheme for expressway
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Topic: Design of expressway service area Plan of expressway service area Plan cad of expressway service area
Special construction scheme for cast-in-place box girder formwork and support
The upper main structure of the project is a three span continuous variable cross-section prestressed concrete continuous box girder structure, with a span combination of 30m+45m+30m and a total length of 105m. The ratio of side span to middle span is 0.67, the box girder at the supporting point of middle pier is 2.6m high, and the ratio of beam height to main span is 1/17.3; The beam height at the center line of the box girder in the side span section and the middle of the main span is 1.4m, the ratio of the beam height in the middle of the span to the beam height at the middle fulcrum is 1/1.86, and the beam bottom of the facade changes in a parabola. The bridge is arranged as two bridges on the left and right, with a single beam width of 23.99m and cantilevers on both sides of 1.0m long. The whole bridge is provided with 4 beams, the width of the middle beam at the pier is 2m, and the width of the end beam at the abutment is 1.2m. Prestressed steel tendons are arranged in the beam. There are three types of longitudinal prestress: top plate tendon, bottom plate tendon and web tendon, all of which adopt Φ s15.20 steel strand and clip anchor anchorage system. The box girder structure shall be constructed by cast-in-situ support method.

Topic: Special construction scheme for cast-in-place beam of support Formwork of cast-in-place beam construction scheme Construction scheme of cast-in-place beam formwork
Cast in situ box girder span of a highway interchange ramp bridge expressway Construction scheme and safety scheme
The interchange D ramp bridge has a total length of 1057.595m and is divided into 12 sections. The fifth unit crosses * * expressway, where the 19 # pier of D ramp (pile diameter 1.3m, pile length 20m; column diameter 1.2m, column length 14m.) is located in the central separator of * * expressway

Topic: Construction scheme of expressway interchange ramp Construction Scheme for Crossing Existing Expressway Construction scheme of cast-in-place bridge crossing expressway
some expressway Detailed plan of ramp bridge
This project is a detailed plan of an expressway ramp bridge, including a plan. The content of the drawing is complete, the expression is clear, and the drawing is rigorous. Designers are welcome to download and use it.

Topic: Ramp bridge Ramp of expressway Detailed drawing of bridge
some expressway Construction scheme of cast-in-place box girder hanging basket of super large bridge
Chahe Super Major Bridge is located at K104+242, which is left and right separated. The left side is 25+75+130+75+3 × 25m, and the right side is 75+130+75+3 × 25m, which is a box shaped variable cross-section prestressed T-shaped continuous rigid frame bridge. The root height of the box girder is 7.5m, and the mid span height is 2.6m. The height of the box girder is the height of the center line of the beam, with a small side to mid span ratio of 0.5769, This will facilitate the reasonable distribution of stress in the box girder. The height of the left and right sides are different, and the arm length is 3.5 m.

Topic: Construction Scheme for Super Large Bridge of Expressway Model construction scheme for super large bridge Construction Scheme for Demolition of Super Major Bridge
expressway -Construction scheme for full support of 20m cast-in-place box girder
The xx span of xx super large bridge is a 20m span cast-in-place box girder, which is located in the horizontal curve range, and the pavement cross slope is within the superelevation transition section. The top plate of the box girder is 11.75m wide, the bottom plate is 8m wide, the outer flange cantilever is 1.875m long, and the box girder is 1.4m high. The box girder has a solid section within 1.5m of the support end, and the rest is a double cavity double chamber section. The web is 0.45m thick, and the bottom plate and bottom plate are both 0.25m thick. The box girder is a post tensioned stress structure, and each web position is 1 bundle of 12 Φ s15.2 and 2 bundles of 18 Φ s15.2 high-strength low relaxation steel strands. Quantities: cast-in-place C50 concrete 326.8m3, reinforcement 104.3T, steel strand 6.6T.

Topic: Guizhou Expressway Support Construction Scheme Construction Scheme of Full Span Bridge Support Construction scheme of tunnel full support
Huangqunan expressway Construction organization design of cast-in-place box girder project
The left side of No. 1 viaduct on the city bottom line starts at K41+083.00 and ends at K41+735.10, with a total length of 652.1 meters, the right side starts at K41+094.00 and ends at K41+750.10, with a total length of 656.1 meters. It is located in Hengzhi Village, Chengguan Town, Kaihua County. The superstructure of the bridge is a 30M simply supported continuous composite box girder+cast-in-place prestressed concrete continuous box girder, a total of 5 units, The second sheet adopts 20+30+20 integral cast box dyeing and cast-in-situ box girder. The eighth hole of the left sheet and the seventh hole of the right sheet cross the city bottom line highway, and the intersection angle is 40?

Topic: Construction organization design of highway engineering Construction Contract of Expressway Project Construction Agreement of Expressway Project
Baijing expressway Cast in situ box girder construction scheme (bowl buckle support)

Construction scheme 1 of cast-in-place box girder: foundation treatment of process flow → installation of support → installation of bottom formwork → pre pressing of support → binding of reinforcement → installation of side formwork → pouring of beam concrete in layers → curing → lowering of support → removal of bottom formwork, side formwork and support. 2. The vertical poles of the main construction control points' crossbeams and solid web sections' supports are set with a longitudinal spacing of 60cm, a transverse spacing of 90cm, a step spacing of 120cm, and a 10cm × 10cm square timber spacing of 20cm under the bottom formwork; The vertical poles of the cross bridge support of the vierendeel plate and flange plate sections are set with a longitudinal spacing of 120cm, a transverse spacing of 90cm, a step spacing of 120cm, and a spacing of 10cm × 10cm square timber under the bottom formwork of 30cm; Cross bridging shall be set every 3.6m or so, and longitudinal cross bridging shall be set 2.4m along the bridge. The base of the pole shall be made of 10cm × 15cm square wood strips, and the bottom support shall be set 20cm upward. 15 × 15cm square wood shall be laid along the bridge under the bottom support, with a horizontal spacing of 90cm. Horizontal diagonal braces are set at the intersection plane of the top of the vertical diagonal braces and the setting layer of the bottom broom to ensure the stability of the support structure. When placing the square timber and laying the bottom formwork, after the upper bracket is adjusted, the longitudinal 10 I-beam steel is laid. The horizontal 10 × 10 cm square timber is laid under the bottom formwork at a spacing of 20 cm, and the 1.2 cm thick high-strength bamboo plywood formwork is laid on the top. 　　...

Topic: Support scheme of cast-in-place box girder Construction scheme of cast-in-place box girder Cast in situ box girder
Shilin Suolong Temple, Yunnan Province expressway Special construction scheme for cast-in-place box girder of a vehicle overpass

XX vehicular overpass is located in xx interchange and spans xx expressway. The crossing stake number is XX=LK0+846.657, the bridge width is 5.5 m, the starting stake number is LK0+819.077, and the ending stake number is LK0+837.237. The superstructure uses 23+23 m prestressed concrete continuous box girder with equal section, with a total length of 54.16 m. The content is detailed and can be used for reference.

Topic: Cast in situ box girder Construction scheme of cast-in-place box girder Support scheme of cast-in-place box girder
some expressway Construction Table 3, 6. DOC

Topic: Summary of expressway construction Expressway construction safety Expressway construction process
expressway Special construction scheme for manual hole digging
The contract section starts at K84+000 and ends at K91+477. There are 12 major bridges and 1 medium bridge, which can be converted into 12 integral bridges with a length of 2633.25m; 2 overpasses; There are 24 culverts along the line with a total length of 1370.9m, including 17 reinforced concrete slab culverts with a length of 912.4m and 7 reinforced concrete circular pipe culverts with a length of 458.5m. In this section, 110500 m3 concrete, 2022m bored piles, 3614m dug piles, 388 25m small box girders, 295 40m T-beams, 20 50mT beams, 1087788.5m3 total excavation (99914.2m3 rock excavation), and 95610.9m3 total filling.

Topic: Special construction scheme for manual excavation of expressway Construction scheme in expressway Construction scheme of expressway
Beijing, Hong Kong and Macao expressway Method Statement for Removal and Displacement of Guardrail
1. Construction sequence: construction setting out, removal of the original guardrail, installation of guardrail posts 10 cm outside the outer edge line of the old road lane, installation of guardrail boards, construction of new roadbed, pavement subbase, lower base course, removal of the guardrail moved in, placement of water injection isolation piers, construction of upper base course of pavement. 2. From the beginning of construction setting out, the expressway on the construction side of the outside traffic lane shall be closed and driven as a single lane, and the speed shall be limited and overtaking is prohibited. According to the markings on the outer edge of the old road carriageway, the markings on the installation position of temporary guardrails shall be accurately set out, and white paint shall be used for marking. The temporary guardrail posts shall be set out according to the spacing between the original guardrail posts, and the cross shall be made with white paint. 3. To remove the original guardrail, first number the original guard board, then unscrew the fixing screws of the guard board, remove the guard board, and place it on the shoulder in order. The excavator is parked horizontally on the new subgrade, the original guardrail column is pulled out and placed on the shoulder in the same order. For the guardrail column that is difficult to pull out, the earth shoulder shall be excavated first and then the guardrail column shall be taken out. 4. During the installation of guardrails, the position of columns shall be strictly controlled. Firstly, drill holes to the depth required by the design according to the position of the set out column, then place the corresponding column in the empty space, and fill the gap with M10 # mortar to ensure its firmness. After the column is installed and fixed firmly, the guardrail board shall be installed in a timely manner. During installation, attention shall be paid to the original order to ensure that the screw hole position can accurately correspond and be firmly fixed. The guardrail boards are spliced with each other through splicing bolts, and fixed on the column or bracket by connecting bolts. The splicing direction of the guardrail boards shall be consistent with the driving direction. Guardrail components shall be erected as required, and shall achieve smooth and continuous installation effect. The connecting bolts and splicing bolts of the corrugated beam should not be tightened too early, so that the oblong holes of the corrugated beam can be used for timely adjustment during installation. The corrugated beam shall be coordinated with the highway alignment. When the guardrail alignment is considered satisfactory, the bolts can be tightened finally. The assembling bolts of the corrugated beam guardrail are high-strength bolts. During installation, the friction surface of the guardrail board should be kept dry and should not be operated in the rain. The high-strength bolts should be smoothly penetrated into the holes and should not be forced into them. The tightening degree of the splicing bolts should meet the requirements. The anti blocking block and bracket are fixed between the corrugated beam and the column through connecting bolts. Before tightening the connecting bolts, the anti blocking block should be adjusted to be in place accurately. The installation and construction of guardrails shall be carried out simultaneously with the removal and installation, so as to ensure the continuity of the whole road guardrail and ensure the safety of driving and construction. 5. Demolition shall be carried out according to the design requirements for the construction of new subgrade roadbed, pavement subbase and lower base. After the construction is completed, the guardrail moved in will affect the construction of the base and surface layer on the pavement, so it needs to be removed. The removal method is the same as that of the original guardrail, and attention shall be paid not to damage the old road pavement and base course. Before demolition, the water injection isolation pier shall be placed first. The water injection isolation pier is 60cm high, 60cm long, and 40cm wide at the bottom. It shall be placed close to the inside of the lane edge line outside the old road. 6 Construction precautions (1). Before the construction unit dismantles the highway production, it shall do a good job in statistics, establish a standing book, formulate a road production dismantlement plan (time, place, type, specification, quantity) and a traffic guarantee scheme, which can be implemented after being reviewed by the supervision unit, reviewed by the owner, and reported to the relevant departments for approval. (2) During the demolition, warning and construction signs shall be placed according to the requirements of the traffic protection method, the construction area shall be channelized with conical standard, and the traffic protection personnel shall be arranged to hold obvious signs (red flags) to ease the traffic and maintain the traffic safety facilities. The construction personnel shall wear reflective vests and helmets. It is strictly prohibited to enter the traffic lane to ensure smooth and safe construction of the expressway. (3) Before the demolition of the expressway production, the traffic guarantee supervisor shall complete the account registration of the road production to be demolished. During the demolition, the traffic guarantee supervisor shall supervise the construction unit to do a good job in the traffic guarantee work, urge the construction unit to properly keep the road production facilities, so that they can be handed over to the relevant units in the future.

Topic: Construction Scheme of Beijing Hong Kong Macao Expressway Method Statement for Removal and Displacement of Guardrail Construction Scheme for Demolition of Expressway Guardrail
Special construction scheme for cast-in-place box girder of xxx upper structure
1. Xxx is the main line bridge of xxx, with the starting and ending stake numbers of xxx and the total length of 289m. This bridge is divided into left and right spans, with a total of three links. The span arrangement is (40 ＋ 38.4 ＋ 29.6) m ＋ (30 ＋ 35) m ＋ (35 ＋ 30 ＋ 35) m, the bridge width is 37~47.5m, and the bridge length is 289m. The first hole of the first link of the bridge crosses C ramp, the second hole crosses Chongqing Changsha Expressway, and the third hole crosses JS ramp; The fifth and sixth holes of the third unit cross ramp A. The second bridge connects to H ramp; The third link is E ramp. The superstructure adopts prestressed concrete continuous box girder; The plane of the bridge is located on the R=4000m, R=1500m circular curve and transition curve respectively, and the longitudinal slope of the longitudinal section is 0.5%; 1~2 # piers are arranged at an angle of 103 °, and other piers and abutments are arranged radially. 2. The first couplet of this bridge is the first to third spans. The width of a single deck is 22-22.347m, the width of the bottom plate is 13.5-13.846m, the width of the flange plate is 3.5m, and the beam height is 2.2m. It is a single room with three boxes; The second couplet is the fourth to fifth spans, with a single deck width of 22.349-24.641 meters, a bottom plate width of 14.092-16.309 meters, a flange plate width of 3.5 meters, and a beam height of 2 meters. It is a single room four box; The third couplet is the sixth to eighth spans. The width of a single bridge deck is 24.635-17.5m, the width of the bottom plate is 16.321-9.18m, the width of the flange plate is 3m, and the beam height is 2m. It changes from four boxes in a single room to two boxes in a single room. 3. It is estimated that steel pipe buttress Bailey beam support will be used for the construction of cast-in-situ box girder of the bridge in the span of the pier height greater than 23 meters and the second hole of the first couplet crossing Chongqing Changsha Expressway; The construction scheme of erecting bowl buckle full scaffold shall be adopted for cast-in-place box girder within the span of other piers of the bridge whose height is not more than 23m.

Topic: Cast in situ special construction scheme Bridge superstructure construction scheme Special construction scheme for steel boxed box
Special construction scheme for cast-in-place box girder formwork and support
The upper main structure of the project is a three span continuous variable cross-section prestressed concrete continuous box girder structure, with a span combination of 30m+45m+30m and a total length of 105m. The ratio of side span to middle span is 0.67, the box girder at the supporting point of middle pier is 2.6m high, and the ratio of beam height to main span is 1/17.3; The beam height at the center line of the box girder in the side span section and the middle of the main span is 1.4m, the ratio of the beam height in the middle of the span to the beam height at the middle fulcrum is 1/1.86, and the beam bottom of the facade changes in a parabola. The bridge is arranged as two bridges on the left and right, with a single beam width of 23.99m and cantilevers on both sides of 1.0m long. The whole bridge is provided with 4 beams, the width of the middle beam at the pier is 2m, and the width of the end beam at the abutment is 1.2m. Prestressed steel tendons are arranged in the beam. There are three types of longitudinal prestress: top plate tendon, bottom plate tendon and web tendon, all of which adopt Φ s15.20 steel strand and clip anchor anchorage system. The box girder structure shall be constructed by cast-in-situ support method. In accordance with the relevant requirements of JZ [2009] No. 87 document of the Ministry of Urban and Rural Development, a special safety construction scheme shall be prepared for the construction of formwork and supports for the key points of bridge construction, and submitted to the technical director of the enterprise for review. In order to standardize the operation behavior during the erection and removal of formwork and support in this project, prevent various safety accidents, and effectively ensure the safety of personnel during construction, a special construction scheme for formwork and support is hereby formulated. General structural drawing of box girder (see attached figure)

Topic: Construction scheme of cast-in-place box girder support formwork Special construction scheme for box girder support Special construction scheme for cast-in-place box girder
xx expressway -Construction scheme for full support of 20m cast-in-place box girder
The xx span of xx super large bridge is a 20m span cast-in-place box girder, which is located in the horizontal curve range, and the pavement cross slope is within the superelevation transition section. The top plate of the box girder is 11.75m wide, the bottom plate is 8m wide, the outer flange cantilever is 1.875m long, and the box girder is 1.4m high. The box girder has a solid section within 1.5m of the support end, and the rest is a double cavity double chamber section. The web is 0.45m thick, and the bottom plate and bottom plate are both 0.25m thick. The box girder is a post tensioned stress structure, and each web position is 1 bundle of 12 Φ s15.2 and 2 bundles of 18 Φ s15.2 high-strength low relaxation steel strands. Quantities: cast-in-place C50 concrete 326.8m3, reinforcement 104.3T, steel strand 6.6T.

Topic: Construction Scheme of Full Span Bridge Support Guizhou Expressway Support Construction Scheme Construction scheme of 4m full scaffold
some expressway Construction scheme of cast-in-place prestressed concrete box girder with full support
The contract section 20 of xxxxx expressway constructed by our company starts from K167+550 to K175+975, with a total length of 8.425 km. The superstructure of 6 bridges within the scope of this section adopts prestressed concrete cast-in-place continuous beam structure, and the specific dimensions are:

Topic: Current construction scheme of high-speed support Special construction scheme for full support of box girder Special construction scheme for box girder prestress
Guangdong expressway Construction organization design of cast-in-place box girder of overpass bridge (implementation)
The construction organization design of cast-in-place box girder (implementation) of an expressway overpass in Guangdong is detailed and can be used for reference.

Topic: flyover Cast in situ box girder Construction across expressway
Jingtai expressway Supplementary Scheme for Cast in situ Box Girder Formwork of Bid Section III (Beijing Section)
The third bid section (K6+400 ～ K8+850) of Beijing Taizhou Expressway (Beijing Section) Project is designed to start at K6+400, which is located to the south of the main line toll station and the north of Xinfeng River, connecting with the end of the second bid; The design terminal K8+850 is located in the north of Zhongguo Road, with a total length of 2.45km.

Topic: Construction Scheme of Beijing Taizhou Expressway Construction Scheme for Excavation Section of Expressway Cast in situ construction scheme of expressway
Construction Scheme for Cast in situ Box Girder of Huimin Interchange A Ramp Bridge
The upper part of Huimin Interchange A Ramp Bridge is prestressed concrete continuous box girder with equal section, and the bridge deck is paved with 10cm asphalt concrete; U abutment is adopted for the lower abutment, and pile column pier is adopted for the pier. The cylindrical pier body is arranged in parallel with the pier and abutment, and the axis is 70 degrees from the design line. The pile foundation is adopted. A 60 type profiled steel expansion joint is respectively set at 0 # and 2 # abutments of this bridge. GPZ (Ⅱ) 4 pot bearings are used for abutment bearings and GPZ (Ⅱ) 9 for piers bearings; The cross slope of the bridge deck is 2%, which is formed by the top plate of the box girder.

Topic: Interchange construction scheme Construction scheme of high-speed interchange Special construction scheme for interconnection
expressway Special Scheme for Construction of Prefabricated Box Girder Yard
This contract section is the XX bid section of the XX to XX section of Hainan midline expressway, with chainage K190+700~K203+200, and a total length of 12.50 kilometers. There are 12 bridges along the line, the superstructure of which is prefabricated small box girders and cast-in-place box girders, of which 11 are prefabricated bridges: Yanglao Medium Bridge with 3 spans of 20 meters, Guoqiang Bridge with 10 spans of 20 meters, Yongweng No.1 Bridge with 10 spans of 20 meters, Yongweng No.2 Bridge with 12 spans of 20 meters, Changhua River No.5 Bridge with 14 spans of 30 meters, Daohan Bridge with 6 spans of 20 meters, 48, Yiqiu No. 1 Bridge has 80 30 meter box girders with 10 spans, Yiqiu No. 2 Bridge has 40 30 meter box girders with 5 spans, Zhiwen Bridge has 128 30 meter box girders with 16 spans, Daojie Bridge has 90 20 meter box girders with 10 spans, and Yongming Medium Bridge has 14 20 meter box girders with 1 span. There are 432 pieces of 20m box girders, 360 pieces of 30m box girders, 792 pieces in total.

Topic: Construction Scheme for Prefabricated Box Girder of Expressway Special construction scheme for precast beam yard Special construction scheme for beam yard prefabrication
some expressway Cad drawing of ramp bridge design

Drawing content: 51 drawings in total, including general layout, cross section and pavement structure, general structure of box girder, structure of reinforcement under cast-in-place box girder anchor, structure of prestressed steel tendon anchorage of box girder, structure of reinforcement at various parts, structure of expansion joints, structure of piers and abutments, and structure of deck drainage.

Topic: Ramp bridge Ramp of expressway Road and bridge cad