Large-cantilever steel web spinal box beam segment and construction technology

Abstract

The invention discloses a large-cantilever steel web spinal box beam segment and a construction technology. The large-cantilever steel web spinal box beam segment comprises a unit box beam bottom plate and a unit box beam top plate, wherein two steel webs are arranged between the unit box beam bottom plate and the unit box beam top plate, the unit box beam top plate comprises a top plate cross beam arranged in the middle of the unit box beam top plate and wing plates fixedly connected to the two transverse sides of the top plate cross beam, a reinforcing system is arranged between the transverse outer side of each wing plate and the unit box beam bottom plate, a top plate prestressed pore channel is formed in the unit box beam top plate in the longitudinal direction, bolting preformed holes are formed in the two longitudinal ends of each steel web, and a bottom plate prestressed pore channel is formed the unit box beam bottom plate in the longitudinal direction. According to the large-cantilever steel web spinal box beam segment and the construction technology, each component is of a sectional type structure, fractional hoisting can be adopted, the weight of hoisting is light, the requirements for transportation and hoisting equipment are greatly reduced, and construction can be directly finished by means of matching of a conventional truck-mounted crane or a crawler crane and a small-tonnage beam transporting vehicle.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a large cantilever steel web spine box girder segment and a construction process. Background technique [0002] At present, in the field of bridge construction technology, concrete box girder bridges and steel-concrete composite box girder bridges are the most widely used. The webs in this scheme are concrete webs, which are inconvenient for construction during transportation and hoisting. Cracking, its shear strength is low, specifically has the following disadvantages: [0003] 1. The thickness of the concrete web is 300~800mm, and its self-weight is relatively heavy, correspondingly increasing the upper and lower structural engineering of the web, correspondingly increasing the total cost of the project, and the anti-seismic effect is poor; [0004] 2. The structural performance of the concrete web is poor, and its prestressing effect is poor; [0005] 3. The on-...

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Problems solved by technology

[0003] 1. The thickness of the concrete web is 300~800mm, and its self-weight is relatively heavy, correspondingly increasing the upper and lower structural engineering of the web, correspondingly increasing the total cost of the project, and the anti-seismic effect is poor;

[0004] 2. The structural performance of the concrete web is poor, and its prestressing effect is poor;

[0005] 3. On-site construction efficiency is low, and the transportation and hoisting of concrete web and steel web are inconvenient

[0006] 4. The concrete web is affected by external force loads and other factors, and it is prone to cracking, causing corrosion of steel bars and requiring maintenance and reinforcement.

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