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Cable hoisting machine pre-stress rear anchor

A technology of cable cranes and prestressed anchor cables, which is applied in the direction of cable cranes, cranes, erection/assembly of bridges, etc., and can solve problems such as large engineering volume and occupied area, increased weight and frictional resistance, and large volume of rear anchors , to achieve the effect of small excavation works, flexible use, saving cost and construction period

Inactive Publication Date: 2008-07-02
CHINA MAJOR BRIDGE ENG
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AI Technical Summary

Problems solved by technology

[0002] The function of the rear anchor of the cable crane is to provide horizontal and vertical restraint reaction forces for the load-bearing main cable and the back cable. According to the characteristics of the force, it is usually divided into two types: gravity type and embedded type. The gravity type rear anchor uses its The self-weight is used as the vertical restraint force, and the frictional resistance between the base and the foundation is used as the horizontal restraint force. In order to increase the weight and frictional resistance, the volume of the rear anchor is usually relatively large, the project volume and floor area are relatively large, and the required cost is relatively high.

Method used

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  • Cable hoisting machine pre-stress rear anchor

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Embodiment Construction

[0020] With reference to the accompanying drawings, the wooden prestressed anchor is composed of three parts: the anchor hole, the prestressed anchor cable, and the concrete rear anchor. 6 is connected with corrugated pipe 5, cable 1 and concrete rear anchor 2.

[0021] The diameter of the anchor hole 3 is 70-110mm, the spacing is 1-1.5m, the horizontal inclination is 30°-60°, and the depth is 10-20m. Drilling generally uses a small pneumatic drilling rig, which is flexible and convenient to disassemble and move, and is suitable for various terrains and rock formations.

[0022] The prestressed anchor cables are bundled with steel strands, 4 to 8 as a bundle. The anchor cables 4 are anchored in the anchor holes 3. Anchor 2 front end. 4 to 8 strands are put into the anchor hole after being braided, and then grouted into the hole. After the cement slurry reaches the design strength, the anchor cable is anchored in the rock body through the bonding force. The anchoring length i...

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Abstract

A cable loop wheel machine inherent stress stern anchor relates to a cable loop wheel machine stern anchor used for bridge construction, which consists of threes parts of an anchor eye(3), an inherent stress anchor rope(4) and a concrete stern anchor (2). After being bound by a steel strand, the inherent stress anchor rope 4 is arranged in the anchor eye 3 of a mountain massif. An anchor head 6 is connected with a sylphon bellows 5, a cable 1 and the concrete stern anchor 2. The invention exerts an inherent stress between the concrete stern anchor (2) and the mountain massif. After the concrete stern anchor (2) suffers the pull action of the cable (1), due to the existence of the inherent stress, no pulling stresses exist between the stern anchor (2) and the mountain massif and the stern anchor can not generate displacement, thereby reaching the effect of anchoring. The stern anchor of the invention has the advantages of small size, small displacement as well as cost and construction time saving. The invention is in particular suitable for being adopted at rock ground bases and the locations where large machinery can not be used for constructing.

Description

technical field [0001] The invention relates to a rear anchor of a cable crane for bridge construction. Background technique [0002] The function of the rear anchor of the cable crane is to provide horizontal and vertical restraint reaction forces for the load-bearing main cable and the back cable. According to the characteristics of the force, it is usually divided into two types: gravity type and embedded type. The gravity type rear anchor uses its The self-weight is used as the vertical constraint force, and the frictional resistance between the base and the foundation is used as the horizontal constraint force. In order to increase the weight and frictional resistance, the volume of the rear anchor is usually relatively large, the project volume and floor area are relatively large, and the required cost is relatively high. . The embedded rear anchor mainly relies on the passive earth pressure borne by the front end of the rear anchor as the horizontal restraint force, ...

Claims

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Application Information

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IPC IPC(8): B66C21/00E01D21/00
Inventor 周外男潘东发李军堂涂满明毛伟琦周超舟曲江峰陈治任
Owner CHINA MAJOR BRIDGE ENG
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