Butt joint telescopic device supported by steel cylinder

Abstract

The invention provides a novel butt-joint-type telescopic device supported by steel cylinders. The novel butt-joint-type telescopic device comprises the steel cylinders, a rubber water-stop belt, flexible polyurethane foamed plastic, a connecting steel plate, a spring, a comb-shaped steel plate, modified asphalt concrete, an asphalt concrete paving layer, and anchoring steel bars. The steel cylinders are placed at the corresponding positions of beam ends and a bridge abutment and used for providing vertical bearing force, and the load of an upper structure is transferred to a lower structure.The upper modified asphalt concrete is connected with the steel cylinders, and the layer of comb-shaped steel plate is arranged on the upper modified asphalt concrete to form a traffic lane surface. During pouring of a precast plate and a back wall, the anchoring steel bars are pre-buried, connected with the comb-shaped steel plate and used for limiting horizontal sliding and vertical flexural deflection of the steel plate, the flatness of a bridge floor is ensured, and traveling comfortableness is met. Relative stretching-contracting deformation between beam bodies is converted into verticaldeformation of the spring through elastic deformation of the flexible polyurethane foamed plastic in the rubber water-stop belt. The novel butt-joint-type telescopic device is suitable for all kinds of bridges, the force mode is clear, the force transfer path is clear and definite, structural damage is very small, and the structure is durable in use.

Description

technical field [0001] The invention belongs to the technical fields of civil engineering and bridge engineering, and in particular relates to a butt-connected expansion device supported by a steel cylinder that can adapt to the expansion and contraction deformation of a bridge under normal use conditions. Background technique [0002] At present, there are generally butt joint type, steel support type, modular support type, combined shear type (plate type) and seamless type for bridge expansion joints. [0003] The butt joint expansion joint device can be divided into two types, the filling butt joint type and the embedded butt joint type, according to its structural form and force characteristics. Filling butt joint expansion device is to fill gaps with materials such as asphalt, wood boards, hemp wadding, rubber and so on. The embedded butt joint expansion joint device uses steel members of different shapes to embed and fix rubber strips (belts) of different shapes, and ...

AI Technical Summary

Problems solved by technology

[0007] The seamless expansion device can adapt to the expansion and contraction deformation and a small amount of rotation deformation of the bridge superstructure, which makes the bridge deck pavement form a continuous body, and does not cause impact, vibration, etc. when driving. The seamless structure has better waterproof performance and simple construction. It is generally easy to repair and replace; its main disadvantage is that it has a short service life and is only suitable for small joints, and the extrusion between the pavement and asphalt concrete will affect the smoothness of the road surface under long-term use

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