Prefabricated small box girder prestress engineering construction method for intelligent expressway

Abstract

The invention discloses a prefabricated small box girder prestress engineering construction method for an intelligent expressway. The prefabricated small box girder prestress engineering construction method specifically comprises the following steps that S1, construction lofting is conducted; s2, bottom and web steel bars are bound; s3, bottom and web prestressed pipelines are installed; the pipeline installation is synchronously carried out along with the prefabricated small box girder steel bar binding; s4, a formwork is installed; s5, top plate reinforcing steel bars are bound; s6, a top plate prestress pipeline is installed; s7, mounting an anchor plate; after the pipeline is installed and before the beam end formwork is sealed, an anchor plate is installed, and the anchor plate and the prestressed pipeline are perpendicularly installed; s8, an end formwork is installed; compared with a traditional prefabricated segmental beam, the number of segments is greatly reduced, and construction is simplified; an internal prestress mode is adopted, the structural durability can be guaranteed by controlling the grouting quality, the structural maintenance cost is reduced, and the method has the advantages of being safe and convenient to construct, good in feasibility and high in reliability.

Description

technical field [0001] The invention belongs to the technical field of prestressed engineering construction, and in particular relates to a prefabricated small box girder prestressed engineering construction method for smart expressways. Background technique [0002] Prefabricated small box girders for expressways are usually prestressed small box girders, and different intensities of prestressed tensioning treatments are required during the stretching process of small box girders. The tensile strength of the steel wire varies from 10% to 100%. During the process of tensioning and increasing the strength of the steel wire, the strength of the steel wire changes greatly. If a steel wire breakage accident occurs, the rebound force of the steel wire will be large when it rebounds, and the impact force will be strong, seriously threatening To the safety of on-site staff. In the prior art, anti-collision mounds are usually set at both ends of the small box girder during the pres...

AI Technical Summary

Problems solved by technology

In the prior art, anti-collision mounds are usually set at both ends of the small box girder during the prestressed tensioning process, or special anti-collision concrete walls are built. Although these two methods can play a protective role to a certain extent , but it has the following defects as a whole: 1. The anti-collision wall is large in size and occupies an excessively large construction site; 2. The anti-collision wall is easily damaged and deformed, and needs irregular maintenance; 3. The anti-collision wall is relatively rigid, and it is easy to The collapse caused secondary damage; 4. After the construction of the anti-collision concrete is completed on site, it is difficult to handle and has a great impact on the environment

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