Shallow-buried flexible comb-tooth plate-shaped expansion device and installation method for highway bridges

Abstract

The invention discloses a highway bridge shallow-embedded type flexible comb plate expansion and contraction device. The highway bridge shallow-embedded type flexible comb plate expansion and contraction device comprises a movable comb plate, anchoring nuts, flexible anchoring bolt assemblies, anchoring steel bars, reinforcing steel bars and a fixed comb plate. The flexible anchoring bolt assemblies penetrate through connecting through holes in the fixed comb plate and the movable comb plate correspondingly to be connected with the anchoring nuts. The movable comb plate and the fixed comb plate constitute a continuous bearing surface. The flexible anchoring bolt assemblies are fixed to the anchoring steel bars in a welded or bound mode, and reserved steel bars, the reinforcing steel bars and the anchoring steel bars are mutually nested and then are welded or bound firmly. The invention further discloses an installation method of the highway bridge shallow-embedded type flexible comb plate expansion and contraction device. According to the technical scheme, the flexible anchoring bolt assemblies are adopted, and thus stretching, resetting and horizontal twisting can be achieved, the requirement that the movable comb plate changes the position along with rotation of a beam end is met, the installation stability of the movable comb plate is ensured, the structure is simple, and shallow-embedded type installation is easy to implement.

Description

technical field [0001] The invention relates to the technical field of reconstruction and construction of old highway bridges, in particular to a shallow-buried flexible comb-tooth plate-shaped expansion device for highway bridges. Background technique [0002] With the continuous development and growth of my country's comprehensive national strength, the domestic transportation industry has also developed rapidly, and there are countless municipal bridges and super-large bridges. Bridges serve as a link to cross obstacles, realize shortcuts, and even an important "lifeline" for earthquake relief. The telescopic device that makes up the bridge deck system is a general term for various devices that ensure the smooth passage of vehicles and meet the needs of bridge deck displacement. It is an important part of the bridge. In bridge design, in order to ensure that the bridge span Under the influence of factors such as concrete shrinkage and concrete shrinkage, the length of th...

AI Technical Summary

Problems solved by technology

[0007] ①The installation depth is large, which is difficult to meet the requirements of small-span bridges and other bridge structures with shallow buried installation requirements

[0008] ②The anchoring methods are all rigid anchoring, and the anchor nut is easily damaged, resulting in the failure of the overall failure of the telescopic device

The telescopic device has to bear the action of external force repeatedly during use. When the force is transmitted and acts on the anchor structure, the nut is easy to collapse prematurely under the action of external force.

Once the anchoring system fails, the telescopic device will lose its function immediately, and even become a safety hazard after being raised

[0009] Another disadvantage of rigid anchorage is that the anchorage structure cannot adapt to the requirements of the corner of the beam end. The strength of the local concrete is lower than that of the parts of the telescopic device. In the process of repeated external forces, local concrete is prone to damage and scattering, resulting in the lower part of the telescopic device. null

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