Combined anchorage of suspension bridge tunnel anchor and its building method

Abstract

The invention provides a combined anchorage of a suspension bridge tunnel anchor and its building method. A tunnel anchor combined anchorage is formed by excavating a front anchor room at a mountain slope at a single side or double sides of the suspension bridge, and then separating into multiple small-sectional tunnel anchor holes and entering the mountain body, excavating the anchor hole and a back anchor room; pouring a concrete anchor cock body. The front section height and the bottom side width of every small section tunnel anchorage are 3-5 m, and the back section height and the bottom side width are 5-8 m; multiple small section tunnel anchorage share one front anchor room and a scattered cable saddle; the back anchor room is separated. By fully using the resistance of the rock bodyitself, the section face of the anchor hole is reduced, and it is easy to form a hole, and the construction difficulty is reduced; the rock body application scale of the tunnel type anchorage is enlarged, and the cost is greatly reduced by comparing with the regular tunnel type anchorage; therefore, the combined anchorage has big economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering and relates to the design of suspension bridge anchors, in particular to a suspension bridge tunnel anchor combined anchor and a construction method. Background technique [0002] At present, the anchorage types of suspension bridges mainly include gravity anchorage, tunnel anchorage, composite anchorage of gravity anchor or tunnel anchor + anchor cable, and composite anchorage of reinforced concrete and rock mass. Gravity anchors are used in soil and weak rock foundations, relying on the friction between their own weight and the foundation to resist the tension of the main cable. The amount of earthwork excavation and concrete construction is large, and the impact on the ecological environment is also great. Tunnel anchors are often used in canyon areas with relatively hard and complete rock mass. Most of the tension in the main cable is transmitted to the surrounding rock through the ...

AI Technical Summary

Problems solved by technology

It is difficult to guarantee the durability of the composite anchor cable of gravity anchor (tunnel anchor) + anchor cable

There are many drilling holes for the composite anchorage of rock mass and reinforced concrete slab, and the construction process is complicated

With the in-depth understanding of the mechanism of tunnel anchoring, the surrounding rock of the tunnel anchor is sufficient to withstand the pulling force of the main cable, and can be used as the main stress structure of the main cable of the suspension bridge. However, since the longitudinal section of the tunnel anchor is the deformation section of the city gate, the section of the tunnel mouth is small, and the section of the anchor plug body is large, so the requirements for the overall stability of the terrain and rock mass are high, so the tunnel anchor Generally, it can only be used in mountainous areas, where the overall stability of the rock mass is good, and it is not easy to collapse during the construction process. It cannot be used for some rock and soil masses with low engineering quality, and due to the large cross-section of the tunnel anchor, there are still large holes. chamber hole problem

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