Large-span cantilever truss type capping beam bracket system and construction method thereof

Abstract

The invention discloses a large-span cantilever truss type capping beam bracket system. The large-span cantilever truss type capping beam bracket system sequentially comprises a bearing device, an elevation adjusting device, a truss mechanism and an operation platform from bottom to top; the truss mechanism comprises two truss bodies, each truss body comprises two truss assemblies, each truss assembly comprises an upper chord member and a lower chord member, each upper chord member is provided with a plurality of upper joints, each lower chord member is provided with a plurality of lower joints, and a straight web member is arranged between each upper joint and the corresponding lower joint; and a center joint is arranged in the midpoint between every two adjacent upper joints, inclined web members distributed in a splay shape are arranged between each center joint and the two corresponding adjacent lower joints. The invention further discloses a construction method of the large-span cantilever truss type capping beam bracket system. According to the large-span cantilever truss type capping beam bracket system and the construction method thereof, demounting, mounting and construction are convenient, the amount of steel used is small, and the height of an overall truss structure can be adjusted; and normal driving of a car is not affected in a working state.

Description

technical field [0001] The invention relates to the technical field of engineering construction, in particular to a large-span cantilever truss type cover beam support system and a construction method. Background technique [0002] With the increasing urbanization of our country and the steady increase of urban population, urban expressway has become an important means to solve urban traffic congestion. The common urban expressways in China all adopt "ground road + main line elevated", that is, the cap of the main line elevated is located in the central divider of the ground road, and the cantilevered cover beam is used as the supporting structure of the elevated to realize double-layer traffic on the road. [0003] As a cast-in-place concrete structure, the traditional bowl-button-type full hall support technology has been subject to more and more constraints and challenges: [0004] 1. During the construction of the full hall support system, the entire projection range of...

AI Technical Summary

Problems solved by technology

[0004] 1. During the construction of the full hall support system, the entire projection range of the cover beam does not allow vehicles to pass: 1). For existing road reconstruction projects, this process increases the difficulty of temporary traffic protection (the tighter the surrounding land resources, the greater the degree of restriction ); 2) For new projects, this process requires additional construction of temporary access roads. This area is often the layout range of rainwater and sewage pipes, which needs to be discarded later, which not only increases construction costs, but also involves large stone and machinery investment, which is not in line with energy conservation. Environmental protection and green construction requirements;

[0005] 2. The support system of the full hall requires reliable foundation treatment. For soft soil areas, the depth of foundation treatment is often 1.5 to 2.0 times the height of the new road cushion, and the surface layer needs to be poured with a 20cm concrete cushion. All chiseled out, the temporary consumption of concrete and the additional investment of stone work not only increase the construction cost, but also consume a lot of precious social resources;

[0006] 3. The overall stability of the support system of the whole hall is affected by the surrounding area. When heavy vehicles pass frequently around the support system, the newly poured cover beams are easily disturbed and cracks appear, which poses a great hidden danger to the later elevated operation

[0007] To sum up, in order to solve the problems of large resource consumption, high construction cost and hidden dangers in the main structure of the traditional bowl button full hall support technology, a new type of cover beam support system was developed.

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