Pre-stressed full-length anchoring system and method for adding steel grit with post filling method
A full-length anchoring and prestressing technology, used in earth-moving drilling, bolt installation, infrastructure engineering, etc., can solve the problems of complicated construction operations, weak bolt strength, high economic cost, and achieve overall anchoring quality and anchoring effect. Guaranteed, easy to apply preload, economical effect
Active Publication Date: 2020-11-13
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0005] Technical problem: The purpose of the present invention is to overcome the shortcomings of the existing full-length anchoring technology, such as weak anchor rod strength, difficulty in applying pre-tightening force, poor anchoring effect, complicated construction operations, and high economic costs, and then provide a convenient construction process, Prestressed full-length anchoring system and method that are easy to apply pretightening force, have high overall strength of the anchoring system, and low economic cost, and have certain practical value
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specific Embodiment 1
[0045] Such as image 3 As shown, it is the pullout displacement-pullout force obtained from the pullout test of the anchor bolt anchored by pure steel sand under the conditions that the inner diameter of the steel pipe is 28mm, the diameter of the anchor rod is 22mm, the anchorage length is 350mm, and the particle size of the steel sand is 1.4mm. curve. In the steel pipe-anchor pullout experiment in the laboratory, the inner anchorage length of the steel pipe is 350mm, the inner diameter of the steel pipe is 28mm, the diameter of the anchor rod is 22mm, and the grain size of the steel grit is 1.4mm. The pullout test carried out shows that the peak force can reach 163.8kN, the corresponding drawing displacement is 45.3mm.
[0046] A prestressed full-length anchoring method based on post-filling method adding steel grit, the steps are as follows:
[0047] a. During the excavation process of the coal (rock) roadway 1, the bolt hole 3 is constructed at the coal side 2 of the ex...
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Abstract
The invention discloses a pre-stressed full-length anchoring system and method for adding steel grit with a post filling method, which are applicable to the field of coal roadway supporting engineering or geotechnical engineering under the lithologic conditions with medium hardness and above. The system comprises a drill hole, an anchor rod, a resin anchoring agent, small-grain-size steel grit, atray, a nut, an inclined hole and a steel grit filling funnel. In an actual construction process, resin cartridge anchoring is performed on the end part of the anchor rod according to a traditional mounting way, the tray and the nut are mounted and pretightening force is applied, then the small-grain-size steel grit is poured into the drill hole through the steel grit filling funnel mounted at theinclined hole, and therefore, pre-stressed full-length anchoring is realized. The prestressed anchoring of the front end of the system is realized by the anchoring agent, the rear end ranges are in mutual contact through the steel grit, tight meshing with transverse ribs on the surface of the anchor rod is realized, and then full-length anchoring is realized. The system is simple in structure, convenient in construction process and low in economic cost, and the whole anchoring system is high in strength and has certain practical value.
Description
technical field [0001] The invention relates to a prestressed full-length anchoring system and method based on a post-filling method and adding steel sand, and is especially suitable for the field of coal roadway support engineering or geotechnical engineering under medium-hard and above lithology conditions. Background technique [0002] Coal mine bolting technology can significantly improve the effect of roadway support, reduce the cost of roadway support and reduce labor intensity, so it has been widely used at home and abroad. At present, coal mine bolting technology can be divided into three types according to the anchoring length: end anchoring, extended anchoring, and full-length anchoring. End anchorage and lengthening anchorage have the advantage of being easy to apply and spread the preload. However, under the above two anchorage methods, the rod body is not sensitive to surrounding rock deformation and layer separation, and the support stiffness is low and the she...
Claims
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IPC IPC(8): E21D21/00E21D20/02E02D5/74E02D15/04
CPCE02D5/74E02D15/04E21D20/021E21D20/025E21D20/028E21D21/0026
Inventor 冯晓巍杨厚强
Owner CHINA UNIV OF MINING & TECH