A device for compensating prestress loss and its construction method

Abstract

The invention discloses a pre-stress loss compensation device and a construction method thereof. The device comprises a pre-stress anchor pole, a clamping member and an anchorage, the clamping piece of a truncated cone shape is connected with the pre-stress anchor pole, the anchorage comprises an expanded toothed bowl and a fastener, the expanded toothed bowl comprises bowl walls and clamping groove units arranged successively from top to bottom and in end-to-end connection, the clamping units are used in cooperation with the clamping member, each clamping groove unit is composed of clamping grooves, springs are arranged between the clamping grooves, the clamping grooves are fixedly connected to the bowl wall, and the fastener is arranged outside the bowl walls; and adjusting devices are arranged under the clamping grooves respectively, each adjusting device comprises a hollow structure and an entity structure positioned therein, the bottom of the hollow structure is fixedly connectedwith an anchor backing plate, the two sides opposite to each other of the hollow structure are provided with arc slideways respectively, the entity structure is fixedly connected with the bowl wall, the two sides opposite to each other of the entity structure are fixedly provided with shafts respectively, and the shafts are in sliding connection with the arc slideways respectively. The pre-stressloss compensation device and construction method thereof has advantages including short construction period, simple construction and obvious processing effects.

Description

Technical field [0001] The invention belongs to the technical field of civil engineering geotechnical anchoring, and mainly relates to a device for compensating loss of prestress and a construction method thereof. Background technique [0002] Anchorage technology is an important subject in the field of geotechnical engineering, with a wide range of applications and various installation forms. Prestressed anchor cable is an important reinforcement method in geotechnical engineering. After installation, it can actively apply compressive stress to the reinforced rock and soil, which can effectively limit the harmful deformation and displacement that may occur, thereby improving the stability of the rock and soil. To ensure engineering safety. Prestressed anchor cable is an efficient, economical and practical engineering technology. [0003] For rock slopes with poor stability, pre-stressed anchor cables are currently used for reinforcement. Compared with other support measures, pre...

AI Technical Summary

Problems solved by technology

However, due to the prestress loss of the prestressed anchor cable due to soil creep, impact and relaxation of the anchor cable material, the prestress value of the anchor cable is less than the design value, which threatens the stability of the anchoring project.

[0005] In the existing technology, the compensation for the prestress loss of the anchor cable can only be done before the anchor cable is put into use, and the prestress compensation cannot be performed during the use of the anchor cable, such as the creep of the rock mass, the relaxation of the steel, the rainfall, the temperature Influenced by factors such as groundwater changes and groundwater changes, the prestress of the anchor cable is lost, and prestress compensation cannot be performed.

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