Large section inclined tunnel type arc seat structure for arch bridge and construction method thereof

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 arch seat structure for arch bridges and a construction method thereof. Background technique [0002] Generally, there are three types of arch abutments for arch bridges: open cut and expanded foundation, composite pile foundation, and rock-socketed foundation. Among them, the steps of open-cut and expanded foundation construction are simple, and the application is very common; but there are the following shortcomings: [0003] 1. A large amount of excavation of foundation pits or slopes often results in high slopes; [0004] 2. Large amount of masonry for backfilling of arch abutment; [0005] 3. During the construction period, it will have a greater impact on the surrounding ecological environment. [0006] 4. In some deep-cut gullies or reservoir bank areas with high environmental protection requirements, if the arch abutment adopts the method...

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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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