Tunnel type composite anchorage

Abstract

The invention discloses a tunnel type composite anchorage and can effectively solve the problems of the strength and the rheological problems of a bridge location tunnel type anchorage with worse rock quality, and furthermore, the safety of tunnel cavitation is easily guaranteed. The tunnel type composite anchorage comprises a tunnel, an anchor plug body (21) and a front anchor room (22), wherein the anchor plug body (21) is formed by concrete which is filled and poured into the inner section of the tunnel; a rest pier (23) is arranged in the front anchor room (22); a main cable (10) is scattered by a rope scattering saddle at the top of the rest pier (23), and then, is anchored on the front anchor surface of the anchor plug body (21); anchor rods (31) which penetrate into a surrounding rock from the surface of a bedrock are distributed at the arch crown section and two side wall sections of the tunnel at intervals; a primary supporting structure and a secondary lining (35) are inwards arranged in sequence from the surface of the bedrock; a prestressed anchor rope (24) which penetrates through the anchor plug body (21) and the inner end surface of the tunnel and enters a deep rock mass is distributed and arranged along the axial direction of the tunnel; and two ends of the prestressed anchor rope (24) are fixedly connected with the front anchor surface of the anchor plug body (21) and the deep rock mass anchor respectively.

Description

technical field [0001] The invention relates to bridge engineering, in particular to a tunnel-type anchorage structure suitable for large-span suspension bridges in mountainous areas. Background technique [0002] Modern suspension bridges are mainly composed of four major components: anchorage, cable towers, cable systems, and stiffening beams. As an important component that transmits cable force to the foundation, anchorage is generally divided into two types: gravity anchorage and tunnel anchorage. The gravity anchorage relies on the self-weight of the anchorage to balance the huge pulling force of the main cable, while the tunnel anchorage makes full use of the interaction between the anchorage and the surrounding rock mass to anchor the main cable. [0003] Compared with the gravity anchor, the tunnel anchor is cheap. For example, the George Washington Bridge in the United States was built in 1931. The gravity anchor requires 107,000 m of concrete 3 , the tunnel ancho...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a tunnel-type composite anchorage, which can effectively solve the strength and rheological problems of the bridge-site tunnel-type anchorage with poor rock quality, and the safety of tunnel formation can be easily guaranteed

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