An Integral Abutment Seamless Bridge Using Double-layer Concrete Steel Tube Flexible Pile

Abstract

The invention relates to an integrated seamless abutment bridge applying a double-layer flexible concrete-filled steel tube pile. The integrated seamless abutment bridge comprises a main beam of a bridge body and a concrete-filled steel tube pile body inserted into the ground surface, wherein the section of the pile body is of a flat structure; the pile body comprises an inner steel tube and an outer steel tube which sleeves the periphery of the inner steel tube; concrete is poured into a cavity formed between the outer circumferential wall of the inner steel tube and the inner circumferential wall of the outer steel tube; the minor axis direction of the pile body is perpendicular to the length direction of the main beam. According to the integrated seamless abutment bridge applying the double-layer flexible concrete-filled steel tube pile, the compressive strength and the toughness of the concrete are improved; meanwhile, the local buckling of the steel tubes can be avoided or delayed by virtue of the concrete, the vertical bearing capacity is ensured, the lateral push resistance rigidity is low to the greatest extent, the lateral rigidity is reduced, the horizontal longitudinal displacement of the bridge body can be well absorbed, the anti-seismic property and the dissipation property of the pile are improved, the dead weight is reduced, the fire resistance is improved, the construction is simplified, and the integrated seamless abutment bridge has better economic benefits.

Description

technical field [0001] The invention relates to an integral abutment seamless bridge using double-layer steel pipe concrete flexible piles, which belongs to the field of bridges. Background technique [0002] Under the condition of temperature changes, the bridge structure will undergo deformation such as expansion and contraction. In order to eliminate the influence of deformation on the structure, expansion joints are generally set in the structure. In order for the vehicle to run smoothly, it is generally necessary to install an expansion device on the expansion joint. However, the expansion device is prone to damage or failure under environmental factors, which affects the normal use of the bridge and increases maintenance costs. At present, it is generally believed that the seamless bridge without expansion joints is the best solution, and the integral abutment bridge is the most widely used type of seamless bridge. [0003] In the integral abutment bridge, due to the ...

AI Technical Summary

Problems solved by technology

In order to meet the expansion and deformation of the bridge body and improve the seismic performance and energy consumption capacity, flexible pile foundations are often used. In foreign countries, H-shaped steel pile foundations are mainly used. In my country, due to economic considerations, reinforced concrete piles are often used as integral bridges. However, the horizontal deformation capacity of reinforced concrete piles is significantly lower than that of steel piles, and they are easily cracked, resulting in corrosion of steel bars, poor seismic performance and energy dissipation performance.

[0004] There are several deficiencies in the concrete pile foundation: 1. The horizontal push-resistance rigidity is large, which cannot well absorb the horizontal deformation of the upper structure caused by temperature changes and automobile braking; 2. The seismic performance and energy dissipation performance are relatively poor; 3. The concrete is easy to Cracks, causing corrosion to steel bars

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