A kind of construction method of bridge expansion joint filling material

Abstract

The invention discloses a construction method for a bridge expansion joint filling material. The construction method solves the problems that a bridge expansion joint filling material is poor in stretch bending resistance and high in cost, and the durability of a bridge expansion joint is poor in the prior art and has the advantages that the flexure-tension resistant performance is high, and used polyvinyl alcohol fibers are few. According to the technical scheme, the construction method comprises the following steps that (1) an expansion joint is installed according to the structure design requirement, and steel bars are bond; (2) a fiber concrete composite material is mixed, and baffles are arranged in the positions, close to the two sides of the expansion joint, of a deck; (3) the fiber concrete composite material is poured, the mixed fiber concrete composite material is guided into a funnel, the bottom of the hopper is provided with grid-shaped pores, the length of the pores is 8-12 cm, the width is 4-6 cm, the hopper enables fiber concrete composite material fibers flowing through the grid-shaped pores under the action of the gravity of the fibers to be forward, and the direction of the fibers is parallel to that of the bridge expansion joint after pouring; and (4) after the fiber concrete composite material reaches initial setting, surface finishing and maintenance are conducted.

Description

technical field [0001] The invention relates to the field of bridge structures, in particular to a construction method of filling materials for bridge expansion joints. Background technique [0002] At present, due to the overload of vehicles, the increase of traffic volume, the tight road construction period and insufficient construction quality, the concrete surface of the bridge expansion joints is damaged to varying degrees, and the bridge head jumps (due to the differential settlement at the road bridge head and expansion joints. Or the expansion joint is damaged, so that the longitudinal slope of the road surface has steps, causing the vehicle to jump when passing) The phenomenon is more serious, which brings great safety hazards to traffic safety and traffic congestion. At the same time, the stress mechanism of bridge expansion joints is relatively complicated, which is not only affected by the vertical pressure of the vehicle, but also by the warping force caused by ...

AI Technical Summary

Problems solved by technology

[0002] At present, due to the overload of vehicles, the increase of traffic volume, the tight road construction period and insufficient construction quality, the concrete surface of the bridge expansion joints is damaged to varying degrees, and the bridge head jumps (due to the differential settlement at the road bridge head and expansion joints. Or the expansion joint is damaged, so that there are steps on the longitudinal slope of the road surface, causing the phenomenon of jumping when the vehicle passes) The phenomenon is more serious, which brings great safety hazards to traffic safety and traffic congestion

At the same time, the stress mechanism of bridge expansion joints is relatively complicated, which is not only affected by the vertical pressure of the vehicle, but also by the warping force caused by the impact load in the horizontal direction and temperature difference. Therefore, the requirements for the filling materials of bridge expansion joints are relatively high. Larger compressive strength, but also better tensile strain capacity, impact resistance, and wear resistance. Nowadays, most of the bridge expansion joint filling materials use ordinary concrete, because ordinary concrete only has a relatively large compressive strength. , its tensile strength is low (only 1 / 10-1 / 20 of its compressive strength), and it is prone to bending and impact damage, resulting in pits on the surface of expansion joints, which will affect the road surface and subgrade under long-term conditions. And the bridge structure is damaged, which has a great adverse effect on the performance of the road

[0003] Although steel fiber reinforced concrete is also used to replace expansion joint filling materials, the bending and tensile properties of steel fiber reinforced concrete are still very low, which cannot meet the deformation requirements of bridge expansion joints

At the same time, the use of steel fiber reinforced concrete has a great hidden danger of tire blowout, which seriously threatens traffic safety.

[0004] Although polyvinyl alcohol fiber concrete is used as the filling material of bridge expansion joints in the prior art, and the tensile and bending performance of polyvinyl alcohol fiber concrete as the filling material has been improved, but it is necessary to achieve a tensile strength that can meet the requirements. Bending performance, need to use more polyvinyl alcohol fibers, significantly increase the cost of filling materials

Moreover, due to the complex stress mechanism of bridge expansion joints, under the action of vertical pressure, horizontal impact load and warping force caused by temperature difference, it is easy to damage and fail the polyvinyl alcohol filling material, reducing the durability of bridge expansion joints. performance

[0005] To sum up, in the prior art, the bridge expansion joint filling materials have poor tensile bending resistance, high cost, and poor durability of bridge expansion joints, and there is still no effective solution

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