Abutment earth pressure elimination based abutment structure and construction method

Abstract

The invention relates to an abutment earth pressure elimination based abutment structure. The abutment earth pressure elimination based abutment structure comprises an abutment which is connected with a bridge slab and a butt strap; a main beam which is connected with the abutment is arranged below the bridge slab; one end of the butt strap is connected with the abutment and the other end of the butt strap is arranged on a corbel; an embankment with a local reinforcement structure is arranged below the corbel; a fine sand cushion layer is arranged between the embankment and the butt strap; a gap is formed between the embankment and the abutment. According to the abutment earth pressure elimination based abutment structure and construction method, the lateral earth pressure produced by the direct contact of the integral abutment and the embankment is eliminated through reserved gap; the embankment which is close to the abutment is reinforced and is not easy to settle and fall and accordingly the abutment is directly supported on the reinforced embankment and the bending failure of the butt strap is avoided; the limitation on the horizontal direction of the butt strap is small due to the fine sand cushion layer and accordingly the butt strap can freely move vertically and the integral mechanical property of a bridge and the driving comfort are improved.

Description

technical field [0001] The invention relates to the field of bridges, in particular to an abutment structure and a construction method for integral and semi-integral bridges based on eliminating the earth pressure of the abutment. Background technique [0002] The abutment of the integral bridge is casted as a whole with the superstructure and the slab. Because the bridge structure will move longitudinally under the action of alternating temperature, especially in summer, the expansion of the superstructure of the integral bridge will cause a gap between the embankment and the abutment. Large passive earth pressure. In winter, the superstructure of the monolithic bridge shrinks, and the abutment moves away from the embankment. There will be gaps between them, and the embankment will settle under the vertical traffic load, which may cause the embankment due to the lack of lateral support of the abutment. While sliding toward the abutment, this part of the sliding soil will g...

AI Technical Summary

Problems solved by technology

Under the action of multiple repeated cycles, the main structure of the bridge will generate a large secondary stress, which will damage or even destroy the bridge itself and the abutment

[0003] The movement of the embankment soil under the integral bridge slab will cause the settlement of the embankment or the void on the surface, which will cause the slab to span the gap and cause bending failure; at the same time, the uneven settlement between the bridge and the embankment will aggravate the abutment jumping phenomenon, causing the car to jump. The impact on the bridge increases, further causing damage to the bridge structure and causing major economic losses

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