Large-section inclined tunnel abutment structure for arch bridge and its construction method

Abstract

The invention discloses a large section inclined tunnel type arc seat structure for an arch bridge and a construction method thereof. The large section inclined tunnel type arc seat structure comprises an arc seat body, the arc seat body comprises a tunnel chamber dug on the subgrade surface in the inclined direction and a backfill layer arranged in the tunnel chamber, the tunnel chamber comprisesa tunnel body section and a tunnel opening section, the tunnel body section and the tunnel opening section are arranged in the longitudinal direction, the tunnel body section is of a single-layer lining structure, the tunnel opening section is of a double-layer lining structure, and a tunnel opening protective shed is arranged on the outer wall of the tunnel opening section. According to the large section inclined tunnel type arc seat structure for the arch bridge and the construction method thereof, large excavation and high slope of the arc set foundation are avoided, construction risks andpotential operational risks in the construction process are lowered, and meanwhile environmental protective quality is improved.

Description

technical field [0001] The invention relates to the field of arch bridge construction, in particular to a large-section inclined tunnel-type abutment structure for an arch bridge and a construction method thereof. Background technique [0002] There are usually three types of abutments for arch bridges: open-cut enlarged foundations, composite pile foundations, and rock-socketed foundations. Among them, the construction steps of open cut enlarged foundation are simple and widely used; however, there are the following disadvantages: [0003] 1. The excavation volume of the foundation pit or side slope is large, and a high side slope is often formed; [0004] 2. The backfilling of the abutment requires a large amount of masonry; [0005] 3. During the construction period, the surrounding ecological environment will be greatly affected. [0006] 4. In some deep valley areas or reservoir bank areas with high environmental protection requirements, if the abutment adopts the me...

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Problems solved by technology

[0003] 1. The excavation volume of the foundation pit or side slope is large, and a high side slope is often formed;

[0004] 2. The backfilling of the abutment requires a large amount of masonry;

[0005] 3. During the construction period, it will have a great impact on the surrounding ecological environment

[0006] 4. In some deep valley areas or reservoir bank areas with high environmental protection requirements, if the abutment adopts the method of open excavation to expand the foundation, there will be high and steep slopes, and it will be difficult to measure earth and stone and discard slag;

[0007] 5. High security risks in the later stage of operation

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