A kind of construction method of environment-friendly tension-compression composite decentralized anchor rod

Abstract

The invention discloses a construction method of an environment-friendly tension-compression composite dispersed anchor. The anchor comprises a pressure-type anchor, a tension-type anchor and a tension-compression anchor bearing plate, and the pressure-type anchor is a recyclable pressure-type anchor. Rod, including reinforced rod body and unlocking device; its construction method is divided into the following seven steps: 1) positioning; 2) drilling; 3) anchoring; 4) primary grouting; 5) secondary grouting: 6) tension locking : 7) recovery pressure anchor. The invention effectively solves the problems of anchor stress concentration, poor anchoring performance, large long-term stress loss, limited construction of adjacent projects, and environmental pollution, and provides a kind of reasonable stress distribution, strong pull-out bearing capacity, no influence on surrounding construction, and environmental protection , Recyclable, energy-saving and emission-reducing bolts have broad application prospects and significant economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of rock-soil anchorage, and in particular relates to a construction method of an environment-friendly tensile-compression composite dispersed anchor. Background technique [0002] With the acceleration of the urbanization process, there are rows of high-rise buildings, subways and pipe corridors criss-crossing, and a large number of complex deep foundation pit projects emerge. There are various forms of support for deep foundation pits. Conventional support forms include shotcrete anchor support, pile anchor support, and anchor bar composite soil nail wall support, and all of these support systems rely on anchor bars to provide prestress to maintain The overall stability of the foundation pit. [0003] As a common anchoring structure, bolts are widely used in the field of geotechnical engineering, but they generally have the following problems: 1) The anchoring force of the bolt does not increase linearly w...

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Problems solved by technology

[0003] As a common anchoring structure, bolts are widely used in the field of geotechnical engineering, but they generally have the following problems: 1) The anchoring force of the bolt does not increase linearly with the anchoring length, and excessively increasing the anchoring length cannot effectively enhance the anchoring performance; 2) The stress of the pressure anchor is mainly concentrated near the bearing plate, while the stress of the tension anchor is mainly concentrated near the interface between the anchor section and the free section. The stress is too concentrated and unreasonably distributed, which is not good for the pullout performance of the anchor;

[0004] 3) With the increase of infrastructure projects such as subways and pipe galleries, shield tunneling technology is widely used, and the remaining anchor rods in the ground will damage the shield cutter head, resulting in stagnation of the construction period and unnecessary economic losses; 4) The remaining underground Anchor rods seriously damage the underground environment and cause groundwater pollution

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