Pre-stressed anchor rod prevented from being pulled out of anchor hole

Abstract

The invention relates to a pre-stressed anchor rod prevented from being pulled out of an anchor hole. The pre-stressed anchor rod prevented from being pulled out of the anchor hole comprises an anchor rod body with an expansion plug, an expansion tooth bowl, a pad table, a stool plate and a nut. Anchor rod holes are formed in the pad table and the stool plate, the top end of the anchor rod body penetrates through the anchor rod hole of the pad table and the anchor rod hole of the stool plate and then is connected with the nut together, and the expansion plug is arranged in the expansion tooth bowl. The pre-stressed anchor rod prevented from being pulled out of the anchor hole is simple in structure, low in cost and convenient to construct, a pull force-pressure-plug novel combined pre-stressed anchoring system is structured, the anchor rod can be prevented from being pulled out of the anchor hole along with grouting, and the stability of the rock-soil body, the safety of engineering and the debility of anchoring are improved.

Description

technical field [0001] The invention relates to rock-soil anchoring technology, in particular to a prestressed anchor rod which prevents pulling out from an anchor hole. Background technique [0002] Rock-soil anchoring is to tightly interlock the strata through the anchor bolts buried in the formation, relying on the interaction between the anchor bolt-grouting body-hole wall rock-soil physical force to mobilize and improve the rock-soil mass's own strength and natural strength. It is a technology to improve the stress state to ensure the stability of the external rock and soil mass, so as to ensure the safety of the project. The engineering application of geotechnical anchoring technology began at the end of the 19th century. With the development of its theory and technology, it has been extended to mines, water conservancy, hydropower, highways, railways, municipal administration, urban construction, geology, military industry and other departments. It is widely used in...

AI Technical Summary

Problems solved by technology

[0004] During the construction and operation of rock-soil anchorage, the pulling out of the anchor rod together with the grouting body from the anchor hole is the most basic, typical and common form of rock-soil anchorage failure, which will lead to the failure of rock-soil anchorage and endanger the safety of the project. Bring hidden dangers, thereby limiting the anchoring force that the bolt can provide

Therefore, when the anchoring force that needs to be provided is large, ordinary bolt anchorage can no longer meet the requirements of the project, which restricts the application and development of rock-soil anchorage technology. How to improve the load transfer mechanism of rock-soil anchorage and overcome the disadvantages of ordinary anchorage has become a The Fundamental Way to Improve the Anchor Force of Bolt and Improve the Anchor Effect

[0005] In addition, the grouting body can hardly provide anchoring force in the early stage of anchoring, so it cannot meet the requirements of immediate support after excavation of weak rock and soil

Although the existing pipe-slit bolts overcome the above-mentioned shortcomings, the anchoring force can be provided immediately after the bolt is installed, which is beneficial to timely control the deformation of the rock and soil mass, but the anchoring force that can be provided is not large; at the same time, due to the weak The rock and soil will squeeze into the pipe cavity from the pipe seam of the pipe seam anchor, resulting in a decrease in the anchoring force

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