Construction method capable of preventing hollowing at box girder support plate

Abstract

The invention relates to a construction method capable of preventing hollowing at a box girder support plate during box girder manufacturing and mainly solves the problem that a method using glue injection to solve the hollowing at the support plate is poor in effect. The construction method includes: anchoring reinforcing steel bars and horizontal reinforcing ribs are arranged on the support plate; the support plate is coated with epoxy resin glue, and gravels are added into the epoxy resin glue; bottom formwork is polished; the face, contacting with the bottom formwork, of the support plate is sufficiently coated with a release agent, and the periphery of the support plate is completely sealed by glass cement; the middle of the support plate and the bottom formwork are drilled, and blocking off is performed after cement paste flows out during concrete vibrating; using a vibrator to guide concrete vibrating, an attaching type vibrator is turned on to perform concrete vibrating after concrete completely covers embedded reinforcing steel bars at the support plate, and the attaching type vibrator is shut down after the chamfer of a girder body is filled with the concrete; two attaching type vibrators are added near the support plate, and a small skylight is formed in the formwork above the support plate. By the construction method, the hollowing at the support plate can be effectively prevented.

Description

[0001] Technical field: [0002] The invention relates to a construction method capable of preventing hollowing at the bearing plate of the box girder during the manufacturing process of the box girder. [0003] Background technique: [0004] Due to the concealment of the position of the support plate and the particularity of the construction process of the simply supported box girder, the construction quality here is often a weak link that is easily overlooked by the operators. The sound of "dong dong" is produced when the instrument is knocked. The reason for the hollow drum is mainly related to the structure and construction technology. The specific reasons are as follows: [0005] 1. The steel bars embedded in the steel plate above the support plate are too dense, and the vibrating rod is not easy to be inserted into the support plate to fully vibrate. [0006] 2. Coarse aggregate is difficult to fall during concrete pouring, too few stones, too much and too thick cement s...

AI Technical Summary

Problems solved by technology

[0005] 1. The pre-embedded steel plate above the support plate is too dense, and the vibrating rod is not easy to insert into the support plate to fully vibrate

[0006] 2. Coarse aggregate is difficult to fall during concrete pouring, too few stones, too much cement slurry, too thick, resulting in excessive shrinkage of concrete at this place

[0007] 3. The shrinkage and expansion coefficients of the support steel plate and the concrete are different, resulting in asynchronous shrinkage and expansion, resulting in a tiny gap between the concrete and the support steel plate

[0009] 5. The surface of the pre-embedded support steel plate is too smooth, and the bonding force between it and the concrete is not enough, so it cannot shrink synchronously

[0011] Since the bearing plate is a concentrated stress point, if it is not handled properly, the superstructure construction may cause sudden inset and creep indentation at the support. Glue is injected in the gap between the beams, but the result is not ideal, which will have an adverse effect on traffic safety and the stability of the beam itself