Construction method of environment-friendly tension and compression composite distributed anchor rod

Abstract

The invention discloses a construction method of an environment-friendly tension and compression composite distributed anchor rod. Anchor rods involve a pressure type anchor rod, a tension type anchor rod and a tension and compression anchor rod bearing plate, wherein the pressure type anchor rod is a recyclable pressure type anchor rod and comprises a steel bar rod body and an unlocking device, the construction method of the anchor rod comprises the following seven steps of 1) positioning; (2) drilling; (3) loading an anchor; (4) primary grouting; (5) secondary grouting; (6) tensioning and locking; and (7) recycling the pressure anchor. According to the construction method, the problems that an anchor rod is concentrated in stress, poor in anchoring performance, large in long-term stress loss, limited in adjacent engineering construction, environment-friendly and the like are effectively solved, the anchor rod which is reasonable in stress distribution, high in uplift bearing capacity, free of influence on surrounding construction, environmentally friendly, recyclable, capable of saving energy and reducing emission is provided, and the construction method has wide application prospects and remarkable 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...

AI Technical Summary

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 anchor does not increase linearly with the anchoring length, and the anchoring performance cannot be effectively enhanced by increasing the anchoring length; 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; 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

Images