Concrete shrinkage stress restraint system of subway underground long longitudinal structure

Abstract

The invention discloses a concrete shrinkage stress restraint system of a subway underground long longitudinal structure. Supporting transverse beams and side columns are arranged at certain intervalsadditionally in the longitudinal direction of the long longitudinal structure, the transverse beams are arranged on a top plate and a bottom plate respectively, the side columns are arranged on sidewalls on both sides, and the transverse beams are connected with the side columns end to end to form a closed frame. According to the system, through the arrangement that the beams, the columns and the closed frame are arranged on the long longitudinal structure additionally, and anti-cracking steel bars are arranged additionally at the same time, on the one hand, the cross-sectional area and reinforcement ratio of a beam-column structure are increased, the longitudinal rigidity and tensile stress of the structure are improved, on the other hand, the shrinkage stress accumulates at the late stage of truncated structure closing, and the shrinkage effect length is shortened, so as to avoid structural cracks of the long longitudinal structure caused by the shrinkage stress, the safety and durability of a main structure are ensured, safe operation is ensured, a lot of plugging and repair costs of concrete cracks are saved, and economic benefits are good.

Description

technical field [0001] The invention relates to the technical field of engineering construction, and more specifically relates to a concrete shrinkage stress restraint system for underground long longitudinal structures of subways. Background technique [0002] The subway project is an important municipal transportation project in a modern city. It carries the important task of urban residents with a large passenger flow, and its project quality is a century-old project. [0003] In underground projects such as subways, the main waterproof parts of the concrete main structure are the bottom plate, side walls and roof. These parts consider the structural force, economy and clearance requirements of the track area, and basically adopt the one-way slab design, with a length of more than 200 meters. , part of the length is more than 500m, when the main structure is closed, a single plank structure with a length of more than 200m is formed, resulting in a situation where the main...

AI Technical Summary

Problems solved by technology

Even if it can barely pass the project acceptance when it is delivered for use, structural leakage still occurs repeatedly during the operation stage, especially after the water level reaches the design water level, and the construction unit needs to pay a huge amount of plugging fees, which is several times more than the construction stage. It will cause a great economic burden to the construction general contractor, reduce project benefits, and cause negative social impacts, threatening the safety and convenience of passengers

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