A prestressed full-length anchorage system and method based on post-filling method adding steel grit
A full-length anchoring and prestressing technology, which is applied in earthwork drilling, bolt installation, foundation structure engineering, etc., can solve problems such as complicated construction operations, poor anchoring effect, and weak anchoring strength, and achieve overall anchoring quality and anchorage Guaranteed effect, easy to apply pre-tightening force, and low economic cost
Active Publication Date: 2021-05-25
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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The invention discloses a prestressed full-length anchoring system and method based on a post-filling method and adding steel sand, which is suitable for the field of coal roadway support engineering or geotechnical engineering under medium-hard and above lithology conditions. The system includes drilling, anchor rods, resin anchoring agent, small-sized steel grit, trays, nuts, inclined holes, and steel grit pouring into the funnel. In the actual construction process, according to the traditional installation method, the end of the anchor rod is anchored with resin coils, the pallet nut is installed and the pre-tightening force is applied, and then the steel sand pouring funnel installed on the inclined hole is poured into the drill hole. Diameter steel grit to achieve prestressed full-length anchorage. The front end of the device realizes prestressed anchoring through anchoring agent, and the rear end range contacts each other through steel sand, and tightly bites with the transverse ribs on the surface of the anchor rod, thereby realizing full-length anchoring. The structure is simple, the construction process is convenient, the economic cost is low, and the strength of the overall anchoring system is high, so it 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