Interfacial shear stress measurement device for pre-stressed anchor and testing method thereof

Abstract

A prestressed anchor bolt interface shear stress measurement device, comprising a rod body, a PVC pipe arranged parallel to the rod body above it for the introduction of wires, and at least one PVC pipe ring connected to the PVC pipe and nested on the outside of the rod body at intervals. Rectangular holes are set on both sides of the PVC pipe ring. The rod body includes an inner anchorage section extending into the surrounding rock and a free section extending out of the surrounding rock. Strain gauges are pasted on both sides of the rod body corresponding to each position where the PVC pipe ring is installed. Ⅰ, and thin steel bars are hinged at this position. Strain gauges Ⅰ are distributed on the inner anchorage section of the rod body according to the test requirements. , The contact parts of the PVC pipe ring and the PVC pipe are all provided with reserved holes for wires to pass through, and the external strain gauges are respectively connected to the strain gauge I and the strain gauge II through the wires. It provides help for better research on the long-term safety and durability of geotechnical prestressed anchorage structures.

Description

technical field [0001] The invention belongs to the field of measuring devices and test methods, and in particular relates to a prestressed bolt interface shear stress measuring device and a test method thereof. Background technique [0002] Geotechnical prestressed anchorage structure is a high-stress structure buried deep in the ground. Once problems such as poor construction and structural failure occur, it is very difficult to reinforce it. Therefore, not only the stability under normal operating conditions must be considered. More consideration should be given to its long-term durability. There are two interfaces on the anchoring section in the prestressed anchoring structure: (1) the interface between the rod body and the grouting body; (2) the interface between the grouting body and the surrounding rock mass. The research shows that the distribution law of the shear stress at the interface of the anchor section inside the rod directly affects the anchoring effect and...

AI Technical Summary

Problems solved by technology

For the rock-soil prestressed anchorage structure, due to the complexity and concealment of its structure, there is no simple and eff

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