Rock bolt system based on fiber reinforced plastic bolt and ultrahigh-performance cement-based bonding and anchoring medium

Abstract

The invention discloses a preparation method of a rock bolt system based on a fiber reinforced plastic bolt and an ultrahigh-performance cement-based bonding and anchoring medium. The preparation method comprises the following implementation steps of: 1, determining a bolt material and an anchoring and bonding medium; 2, designing an anchor system; 3, anchoring two ends of a bolt by using an anchorage device; 4, performing delivery inspection on the bolt; 5, mounting the rock bolt system on site; 6, tensioning the bolt; and 7, sealing an anchor. According to the rock bolt system, the fiber reinforced plastic is taken as the bolt, an ultrahigh-performance cement-based material is taken as a bonding medium at two ends, a group anchor specially designed serves as an overground anchor and an underground anchor-taper cap combination, excellent characteristics of the two high-performance materials are exerted, and a problem of low durability due to steel bar corrosion and grouting ageing in the conventional rock bolt system is solved. The rock bolt system is safe, reliable and high-efficiency, and has good physical properties and a wide application prospect.

Description

1. Technical field [0001] The invention relates to prestressed rock-soil anchoring technology, in particular to a rock anchor system based on fiber-reinforced plastic tendon anchor rods and ultra-high-performance cement-based bonded anchoring media. 2. Background technology [0002] The rock anchor system is a structural system that embeds tension members into the reinforced rock mass or soil mass, forms an anchor body through the interaction between the two, and jointly bears external loads. The traditional rock anchor system generally uses high-strength steel wire or steel strand as the anchor cable, ordinary cement mortar as the underground anchoring medium, and ordinary prestressed tendon anchors as the anchoring system for the exposed tension end of the anchor cable. Low and poor corrosion resistance, resulting in the following main problems in its practical application: [0003] (1) Ordinary steel prestressed tendons and ordinary cement mortar buried in the rock ancho...

AI Technical Summary

Problems solved by technology

[0003] (1) Ordinary steel prestressed tendons and ordinary cement mortar buried in the rock anchor system are prone to corrosion and aging in complex geological environments. coordinated, seriously affecting the safety and durability of the structure

[0004] (2) Using traditional cement mortar and steel, due to its low strength, the amount of materials and underground engineering is generally large

However, practice has proved that the use effect of the rock anchor system using traditional steel bars and cement mortar is far from meeting this requirement.

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