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Engineering database \ Water supply and drainage \ Water supply and drainage construction design \ construction plan \ Construction Scheme for Cast in situ Box Girder of Wujiadu Interchange

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Construction Scheme for Cast in situ Box Girder of Wujiadu Interchange

Uploaded on: March 23, 2019 13:55:31 come from: Water supply and drainage / Water supply and drainage construction design / construction plan

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The cast-in-place box girder support adopts full hall steel pipe support. When assembling 1-2 span supports, it is necessary to reserve a train passage (6m clear width)

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 1

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 1

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 2

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 2

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 3

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 3

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 4

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 4

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 5

Construction Scheme of Wujiadu Interchange Cast in situ Box Girder - Figure 5

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According to the previous construction experience and the requirements of adopting new technology and new process, the cast-in-place box girder adopts the bowl buckle steel pipe support. The bowl buckle scaffold does not need to do a large area of site leveling, and can be arranged in curves. The loading and unloading speed is more than five times faster than the cross fastener, the labor intensity is reduced, and the connector has excellent shear, bending and torsional mechanical properties, It is more than 0.5 times stronger than the fastener scaffold. All exposed formwork of the box girder shall be made of 15mm thick high-quality plywood according to the requirements of the specification "plywood and steel formwork are preferred", and 15mm thick plywood shall be used for the side formwork and top formwork of the box room.

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Construction Scheme for Cast in situ Box Girder of an Interchange Ramp Bridge in Shanghai (including checking calculation and drawings)

This interchange is located at the intersection of A16 expressway and A30 highway. The included angle between A16 expressway and A30 highway is about 7.280 °. The whole interchange will be implemented in the near future and in the long term. The recent bridge structures mainly include SW, WN, WS and NW, with a total of four ramp bridges.

Topic: Ramp bridge Construction scheme of cast-in-place box girder Cast in situ box girder
Construction Scheme for Prefabricated Box Girder of an Interchange
An interchange bridge (5-20M) crosses XXX National Highway, and its superstructure is prestressed reinforced concrete box girder, with a total of 5 × 10=50 pieces. The bridge is 5m high, divided into left and right parts, and a single bridge is 15m wide. Among them, 3 # pier is located on XXX National Highway, so the construction must be disconnected, and a service road has been built between the new and old 208 National Highway to facilitate the normal passage of vehicles. According to the calculation, the weight of each side beam of prestressed box girder is 55T, and the weight of center beam is 50T. For single hoisting, a 150t crawler crane must be used, supplemented by a 50t crawler crane.

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This project is the construction of cast-in-situ box girders of the first to fifth upper structures of LK15+894 Jianhe Super Major Bridge in Guanxi Interchange. The starting pile number is K15+348.00, and the ending pile number of cast-in-situ box girders is K15+800.00, with a total length of 452m. The cast-in-place section of this bridge needs to cross Interchange A Ramp, Laojian River and Lingang Class I Road in turn.

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The 35 # - 38 # pier (48 ＋ 80 ＋ 48) m continuous beam of the super large bridge across the right line of Mahan interconnection line undertaken by our project department is located on a circular curve with a radius of R=4500m, and the mileage interval is YDK332+737.05YDK332+914.55. It is designed as a cantilever cast-in-place single track continuous beam. The beam body adopts the structure of single box, single chamber, variable section and variable height. The beam height is R=252.516m according to the radius of the circular curve, the horizontal section of the central fulcrum is 3m, and the total length of the side span straight section is 9.65m (including 0.65m from the beam end to the center of the side support). The top width of the box girder is 8.4m, the bottom width is 4.2m, the thickness of the top plate of the box center is 36.4cm, the thickness of the web is 45-55-65cm, and the thickness of the bottom plate is 43.5-85cm. A total of 5 diaphragms are set at the end fulcrum, middle fulcrum and middle span. The diaphragms are provided with holes for inspectors to pass through. The diaphragms at the end fulcrum are 1.2 m thick, at the middle support are 2.4 m thick, and at the middle span are 0.8 m. The whole beam is divided into 47 beam sections. The length of the 0 # beam section at the central fulcrum is 11.0m, the length of the general beam section is 3.5m or 3m, the length of the closure section is 2m, and the length of the side span cast-in-situ straight section is 7.65m. The whole beam adopts a two-way prestressed system.

Topic: Construction scheme of box girder tensioning in winter Construction scheme of prestressed concrete tensioning Intelligent tensioning construction scheme of bridge
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The fourth Oujiang Bridge (pedestrian bridge) project in Qingtian County is located between the Taihe Bridge and Tashan Bridge in Hecheng Town, Qingtian County. It starts from the intersection of Xiaochang Road and Linjiang East Road in the north, ends at Jiangnan Avenue in the south, and spans the Oujiang River. From north to south, it can be divided into the north approach bridge, the main bridge across the Oujiang River, the south approach bridge, the connection between the two banks, the push slope and the landscape tower. The proposed bridge has a total length of 503.979m and a width of 10m. The main bridge is a four span continuous box girder with a span of 70m+105m+105m+70m. It mainly includes the construction of auxiliary works such as the north approach bridge, the main bridge across Oujiang River, the south approach bridge, the connection between the two banks, slope pushing and landscape towers, rainwater drainage, functional lighting, and bridge deck pavement and railings. The estimated total investment of the project is about 99.6977 million yuan.

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G210 Third Bridge passes through Shawen Zhazuo Class I Highway and Urban Trunk Road Project Lot A, starting and ending at K6+300 ～ K11+600, with a length of 5.3km. There are two overpasses in the bid section, namely Jinzhu Road overpass and Donglinsi Road overpass. Both Jinzhu Road Overpass and Donglinsi Road Overpass are of single box three room structure, and the design requires cast-in-place construction. The cross section forms of the two bridges are the same. The box girder of Jinzhu Road overpass is thicker than that of Donglinsi Road overpass. Therefore, the Jinzhu Road overpass is taken as an example in the design and calculation of support formwork. The Jinzhu Road overpass spans National Highway 210, and the whole bridge is on a straight line. The starting stake number of the bridge is AK0+295.146 of Jinzhu Road, and the ending stake number is AK0+428.746. The total length of the bridge is 133.6m. The whole bridge is a continuous beam bridge with 35+50+35m constant section. The box girder adopts a single box three cell structure. The overall width of the bridge deck is 17.3m. The highest part of the box girder is 2.93m, the lowest part is 1.83m, and the flange plates on both sides are suspended 1.6m. The thickest part of the top plate is 0.5m, the thinnest part is 0.25m, the thickest part of the bottom plate is 0.5m, and the thinnest part is 0.25m. The top and bottom plates of side spans gradually thicken at 8.5m from the beam; The middle span is gradually thicker at 6m away from the beam. The end beam is 1.5m long, the side span middle beam is 2.5m thick, the middle diaphragm is 0.3m thick, and the bridge height at the beam is 2.93m. The web at the end beam is 0.8m wide, and gradually becomes 0.5m at the section 3.71m away from the end beam. The web at the middle cross beam is 0.8m wide, and gradually becomes 0.5m at the place 5m away from the middle cross beam. 0.6m × 0.2m haunch is set at the junction of top plate and web, bottom plate and web.

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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)

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K25+838.22 Liutuan Interchange Bridge I is a prestressed cast-in-place box girder of 19.25+26.5+19.25m, with a total length of 71.06m and a deck width of 32.25m. The bridge is located in a circular curve with radius R=6713.159m, and the intersection angle with the main line is 96.79 °. The upper structure is a prestressed concrete continuous box girder with equal section, and full hall support construction.

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Topic: Special construction scheme for full support of box girder Safety construction scheme for cast-in-place full support Special construction scheme for cast-in-place box girder
Construction Scheme of Bailey Bracket for 32m Cast in situ Box Girder
The bridge body is a cast-in-place concrete simply supported box girder. The bridge site is located in dry land and crosses two rivers. Geology: the surface layer is coarse sand and silty clay with gravel, σ 0=150kPa, 1~2m thick; Under it is coarse round gravel soil, slightly dense, σ 0=350kPa; under it is pebble soil with σ 0=400kPa, boulder soil with σ 0=500kPa, and completely weathered~weakly weathered tuff, with good geology. In view of the actual situation, in order to speed up the construction progress and reduce the preloading process, the open cut foundation is set in the middle of the span as the substructure of the support, the open cut foundation and cushion cap of the pier are used as the substructure of the support on both sides, and the Bailey beam is used as the support.

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This data is the design and construction scheme of cast-in-place box girder support, which is detailed and can be used for reference.

Topic: Cast in situ construction scheme Design and construction scheme of cast-in-place concrete Box foundation construction scheme
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This data is the cast-in-place construction scheme of Bailey beam support of box girder, which can be used for reference, study and exchange.

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Construction scheme of cast-in-place box girder of an expressway

1、 Project overview There are 15 cast-in-place box girders in this section, including 3 spans of the widening section of the tenth link of the right side of K86+633.25 Jinpu railway separation overpass, with 3 × 30m bridge openings; K88+615 viaduct has 4 spans in the widened section of the first bridge deck on the left side, and the bridge opening is arranged as 4 × 30m; The AK0+337.345 ramp bridge has 8 spans on the left and right, and the bridge opening is arranged with 19+6 × 25+20m on the left and 20+6 × 25+19m on the right. 　

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Adhere to the quality standards and strictly check each process to ensure that the quality target of 100% project acceptance rate and 95% project excellence is achieved.
Special construction scheme for safety of cast-in-place support of rhombic interchange
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Xx interchange is located about 2.7 km away from xx Town, xx County. This interchange mainly serves the towns around xx. The intersected road of the interchange is S201 (Class III highway), and the interchange form adopts the A-type single trumpet interchange scheme, and the main line crosses the A-ramp. The main quantities include 1 main line cast-in-place bridge, 13 slab culverts, 3 circular pipe culverts, 1 vehicular overpass, 331059.41 cubic meters of subgrade excavation and 345651.91 cubic meters of filling.

Topic: Special construction scheme for prestressed tensioning Special construction scheme for overpass Construction method of prestressed cast-in-place box girder
Special construction scheme for single box multi cell cast-in-place box girder of overpass (double control prestressed tensioning)
Xx interchange is located about 2.7 km away from xx Town, xx County. This interchange mainly serves the towns around xx. The intersected road of the interchange is S201 (Class III highway), and the interchange form adopts the A-type single trumpet interchange scheme, and the main line crosses the A-ramp. The main quantities include 1 main line cast-in-place bridge, 13 slab culverts, 3 circular pipe culverts, 1 vehicular overpass, 331059.41 cubic meters of subgrade excavation and 345651.91 cubic meters of filling.

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Construction Scheme for Cast in situ Box Girder of Urban Flyover Project (MCC attached with detailed calculation sheet)
The line of xxxx North Link Flyover Project in xx City starts from the intersection of Neibaoshan Road and the connecting line of Daguang Expressway in xxx Industrial New Area, extends northward, crosses xxx at xxxxxxxxx with a separate tunnel scheme, crosses Maoji Machinery Plant, Yanhu Road and Laowuhuang Railway in the overhead scheme on the north side of xxx, connects xxx after crossing the ground auxiliary road on the east side of xxx on the south side of Xialu Compression Station, The total length of the north line is about 3.08 km. Two pedestrian stairways are set at the north exit of the tunnel to facilitate pedestrians to access the tunnel. This project includes the east and west main line viaducts and six ramps.

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Figure 13.3 Load distribution in transverse direction at midspan 13.2.2 Formwork load q2 (1) Internal formwork (including support frame): take q2-1=1.2KN/m2; (2) External formwork (including side formwork support frame): q2-2=1.2KN/m2; ⑶ Bottom formwork (including back timber): take q2-3=4.0KN/m2; 13.2.3 Construction load q3 is taken as q3=2.0KN/m2 (the load shall be strictly controlled during construction) because the area is widely distributed during construction and there are few personnel and mechanical equipment required. 13.2.4 Bowl buckle scaffold and distribution beam load Distribution beam load: q4=0.85KN/m2. 13.2.5 Concrete vibrating load The concrete vibrating load of horizontal formwork is taken as q5=2 KN/m2. 13.2.6 Bowl buckle scaffold is calculated according to the erection height of bracket ≤ 8m: q6=1.5KN/m2. 13.3 Calculation of stress on bowl buckle pole 13.3.1 Dead weight load of concrete on mid span web (calculated as per 5% overload): 0.589x26/0.4x1.05=40.199KN/m2 Maximum distributed load: q ＝ (q1-2+q2-1+q2-3+q4+q6) x1.2+(q3+q5) x1.4=(40.199+1.2+4.0+0.85+1.5) x1.2+(2+2) x1.4=62.90KN/m2 bowl buckle pole distribution 60cmx90cm, The layer spacing of cross bar (i.e. the step distance of upright bar) is 60cm, then the stress of single upright bar is: N ＝ 0.6x0.9x62.90=33.97KN<[N]=40KN

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Construction Scheme of Cantilever Cast in situ Box Girder of Highway Bridge ppt
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The AK0+630 ramp bridge of Baise North Interchange of Hechi Baise Expressway is located about 300m south of Nawu Village, Youjiang District, Baise City. The bridge center stake is AK0+630, and the bridge length is 431m. The route intersection stake is AK0+768.719=GRK163+488.577. The intersection angle with the main line center of Longbai Expressway is 60 °, and the span combination is (23+30+23)+7 * 30+(39+60+39) m, The superstructure is prestressed concrete cast-in-place box girder. The bridge deck is 10.5m wide, the substructure is column abutment and column pier, and the foundation is pile foundation. The plane of this bridge is located at circular curve (parameter radius 1200m, left deflection), transition curve (parameter A-120, left deflection) and circular curve (radius 240m, left deflection) respectively, the intersection angle is 90 degrees, and the piers and abutments are arranged radially.

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Construction scheme of cast-in-place box girder with full support of a bridge
Xx Outer Ring Bridge is a 50+4808+50m prestressed concrete arch bridge, which is fully covered with supports and cast-in-place. The center line of the line is oblique to the Qinhe River. The structural form of box girder is single box and single room, straight web, and uniform section box girder; The box girder is 4.4m wide at the top and 2.4m wide at the bottom. The top and bottom plates are 30cm thick and the web plates are 40cm thick. The girder at the arch camber of box girder is 3.1m high and solid, and other parts are 2.1m high.

Topic: Special construction scheme for full support of box girder Construction contract of a bridge Current construction scheme of high-speed support
Special construction scheme for cast-in-place box girder of expressway
The Jianchang Xingcheng branch line of Lingyuan Suizhong Expressway is the need to improve the expressway network in Liaoning Province, change the backward traffic conditions of Xingling Line (S318), and improve the service level and transportation capacity of the channel. It is of great significance to promote the construction of Liaoning Coastal Economic Zone, promote the implementation of the strategy of northwest Liaoning, improve the investment environment in northwest Liaoning, consolidate the achievements of economic development, promote the overall revitalization of Liaoning and even the old industrial bases in northeast China, and promote the healthy development of social economy. The starting point of the project is located in S206, Liutiaogou Tunbei Provincial Highway, Shifo Township, Jianchang County. Jianchang hub interchange is reserved in the north of Liutiaogou to connect with Lingyuan Suizhong Expressway (planned). The project terminal is connected to Beijing Shenyang Expressway through Yuantaizi Hub Interchange, connected to G102 through Xingcheng, and extended to Binhai Road. The total length of the project route is 90.019 km.

Topic: Construction scheme of cast-in-place box girder of expressway Special construction scheme for expressway Special construction scheme for expressway tunnel
Construction scheme of 30m cast-in-place continuous box girder full support
According to the construction design drawing, 1. The project belongs to the proposed section of rural road connecting line in Biekou Town, Tongnan County, Chongqing, which needs to cross a brook. It is proposed to build a new bridge. The road design is Level III and the safety level is Level II. The design reference period is 100 years, the longitudinal gradient is 1.5%, the design load is highway class II, the design speed is 30km/h, and the seismic fortification intensity is VI. In the topography of the bridge construction site, the design and survey unit only carried out a simple survey. The foundation of the substructure may be inconsistent with the geological conditions of the original survey and design. The design scope of the design drawing only includes the main design of the bridge, excluding the approach works and ancillary structures.

Topic: Special construction scheme for full support of box girder Safety construction scheme for cast-in-place full support Safety construction scheme of cast-in-place continuous box girder
Construction Scheme of Cast in situ Box Girder of Approach Bridge of Feilong Island Bridge
The cast-in-place box girder of the approach bridge of Feilong Island Bridge is structurally divided into two forms, the first and sixth are 17m wide box girders with left and right sides not separated; The second, fourth and fifth couplets are left and right separated single 13m wide box girders, with a gap of 2cm between the left and right. The width of one span box girder connecting the second and fourth couplets with the main bridge has changed from 13m to 14.5m. The spans of approach bridges are (2 × 30)+(30+2 × 35+2 × 30)+main bridge+(2 × 30+33+30)+(30+2 × 35+32+30)+(2 × 30). According to the geographical environment of box girder construction, it can be divided into four forms: land, land cross highway, water and island. Among them, 1, 2, 3, 19, 20 and 21 span land, 4 and 18 span south and north roads of Zhangjiang, 5, 6, 7, 16 and 17 span water of Zhangjiang, and 11, 12, 13, 14 and 15 span Feilong Island. The 17m box girder is a single box with double rooms, the floor width is 8.732m, the roof thickness is 22-42cm, the web thickness is 40-60cm, and the floor thickness is 20-45cm. It is designed as an inclined web, with a web slope of 0.604, a flange width of 3.5m, and a flange root thickness of 55cm. The 13m box girder is a single box with two chambers, the bottom plate is 7.06m wide, and the transition section is widened to 8.571m. The top plate is 22-42cm thick, the web is 50-60cm thick, and the bottom plate is 20-45cm thick. It is designed as an inclined web with a web slope of 0.376. The wing plate is 2.5m wide and 45cm thick at the root. The prestress is distributed in the roof, web and floor, which are longitudinal prestress. The flange plate has no transverse prestress.

Topic: Safety construction scheme of box girder bridge Construction scheme for cast-in-place concrete of bridge box girder Approach bridge formwork construction scheme
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
Special construction scheme for foundation treatment of cast-in-place box girder support
The construction mileage of bridge works in this project is AK2+594.347 - AK3+887.647, with a total of 14 couplets of 1286.5m. The width of the standard section is 33.0m and 25.5m. The bridge deck and structure are evenly divided. The width of a single bridge is 16.48m, and the clear distance between the two bridges is 0.04m. Among them, 1-4 and 6-14 are approach bridge projects, with construction mileage of AK2+597.747 - AK2+974.178 and AK3+089.178 - AK3+884.247 respectively, and the total length of the approach bridge is 1171.5m.

Topic: Special construction scheme for foundation treatment Box foundation construction scheme Cast in situ special construction scheme
Construction scheme of cast-in-place box girder deck pavement of a bridge
The total length of an interchange L bridge in this section is 338.6m, and the starting and ending stake numbers are K0+289.654 ～ K0+628.254. The left and right 6 # - 8 # spans of L line bridge are within the scope of recent construction. L bridge is a cast-in-place box girder structure, of which 14 spans are common cast-in-place concrete triplets, with beam length of 17.4m, 20m, beam width of 13.75m and height of 1.4m; The prestressed cast-in-place concrete box girder has four spans in total, with a length of 30m, a width of 13.75m, a height of 1.6m and three boxes. The top plate of box girder is 13.75m wide, and the bottom plate is 9.75m wide. At present, the left and right spans 6 #~8 # have been poured, and the tensioning and pipe grouting have been completed. The bridge deck pavement conditions are available. Other spans will gradually reach the bridge deck pavement conditions according to the construction progress. The bridge deck is paved with 4cm asphalt horseshoe asphalt macadam mixture (SMA-13) and 6cm medium grained asphalt concrete (AC-20), under which is 8cm waterproof C40 concrete with impermeability grade of W6. The deck pavement of cast-in-place box girder bridge is 5241m2, and the total concrete volume is 419.3m3.

Topic: Construction scheme of cast-in-place bridge deck works Safety construction scheme of cast-in-place beam Construction scheme of cast-in-place beam concrete
Xinjiang continuous box girder full support cast-in-situ construction scheme
The starting and ending mileage of Kuitun Viaduct is K2+904.000 ～ K6+915.700, with a total length of 4011.7m. The bridge span combination cast-in-place continuous box girder section has four sections, namely, K3+422.57 Beijing West Road Cross, K4+224.84 Urumqi West Road T-shaped Cross, K4+954.80 Zhungeer Road T-shaped Cross, and K6+641.63 North Ring Road Cross. The starting and ending mileage of Kuitun Viaduct is K2+904.000 ～ K6+915.700, with a total length of 4011.7m. The bridge span combination cast-in-place continuous box girder section has four sections, namely, K3+422.57 Beijing West Road Cross, K4+224.84 Urumqi West Road T-shaped Cross, K4+954.80 Zhungeer Road T-shaped Cross, and K6+641.63 North Ring Road Cross.

Topic: Special construction scheme for full support of box girder Safety construction scheme for cast-in-place full support Safety construction scheme of cast-in-place continuous box girder
Construction scheme of cast-in-place box girder formwork and full scaffold of bridge
The main bridge of this bridge is 40+65+40 variable cross-section box girder structure. The box girder is a single box single room structure with straight web. The width of the box girder roof is 10.99m, the box width is 6m, the outer cantilever is 2.5m, and the road centerline side cantilever is 2.49m. The middle beam at both ends and midspan is 2.2m high, and the beam at the root of the pier top is 3.8m high. The height of the main beam is changed by a secondary parabola. The diversion channel is used to change the channel, and the construction platform is built. The full support method is used for cast-in-place construction of the whole couplet, which is cast in two times

Topic: Construction scheme of cast-in-place box girder support formwork Specification for cast-in-place beam full support Construction scheme of full formwork support
Construction Scheme of Bailey Bracket Cast in situ Simply Supported Box Girder
According to the construction drawings and site conditions, it is decided to adopt the construction scheme of Bailey support method for the construction of the following bridges.

Topic: Special construction scheme for Bailey support Construction Scheme of Concrete Simply Supported Small Box Girder Safe construction scheme of box girder support
Construction Scheme for Wet Joint of a Cast in situ Box Girder of Airport Expressway
1. The concrete for middle cross beam and wet joint shall be poured in two times, with a small amount of pouring at one time; 2. The construction front is long, the material transfer volume is large, and the operators have a long way to go to and from work; 3. There are many potential safety hazards such as holes and edges; 4. The materials cannot be directly transported to the working face, and there is vertical transportation; 5. The large amount of rebar welding has a certain impact on the construction progress.

Topic: Summary of wet joint construction of t beam Tunnel joint construction scheme Concrete joint construction scheme

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