Double-hole single-anchor system and construction method thereof

Abstract

The invention discloses a double-hole single-anchor system which comprises a main cable access hole, an anchor chamber, a splay cable saddle, an anchor plug body, a main cable steel strand, an anchor plug body steel strand, a main cable and a mountain body, the main cable access hole extends backwards to form the anchor chamber, the anchor chamber is divided into a front anchor chamber and a rear anchor chamber, the front anchor chamber is communicated with the terminal of the main cable access hole, the rear anchor chamber is located at the terminal of the front anchor chamber and is in a wedge shape with the front portion smaller than the rear portion, the anchor plug body is located in the rear anchor chamber, the splay cable saddle is arranged on the side wall of the connecting position of the main cable access hole and the front anchor chamber, and a main cable is accessed from the main cable access hole and then dispersed into main cable steel strands through the splay cable saddle and extends backwards to the rear portion of the front anchor chamber. The main cable is dispersed into the multiple main cable steel strands through the cable dispersing saddle and then connected with the anchor plug body steel strands, the tension of the main cable is evenly dispersed to the anchor plug body, under the action of the tension, the side face of the anchor plug body is squeezed and rubbed with surrounding rock, and a cork effect is generated.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a double-hole single-anchor system and a construction method thereof. Background technique [0002] At present, the anchorage forms of suspension bridges mainly include gravity type and tunnel type. Among them, the gravity type anchorage is formed by excavating foundation pits and pouring large-volume concrete. It needs to rely on its own gravity to resist the pulling force of the main cable. The shortcomings of large quantity, high cost, and large disturbance to the surrounding environment; tunnel anchorage is to excavate a tunnel in the rock mass, and pour concrete inside to make it work with the surrounding rock to form an anchor plug body, and the main cable passes through the anchor The plug body transmits most of the pulling force to the surrounding rock. Compared with the gravity anchor, the tunnel anchor body is only 20% to 25% of the gravity anchor, and has le...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing technology, a tunnel anchor with a double-hole single-anchor system and its construction method are proposed. In order to improve the pull-out bearing capacity of the anchorage, the scale of the anchor plug body is increased, which greatly increases the difficulty of excavating the anchor plug body tunnel; The large disturbance to it leads to the problem that the constraint of the surrounding rock on the anchor plug body is reduced

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