Drilling simulation device for bolt drawing test

Abstract

The invention discloses a drilling simulation device for bolt drawing test, which comprises a butt joint-type steel pipe formed by mutual butt joint of two semicircular pipe walls axially. The inner wall of the butt joint-type steel pipe is provided with a notch groove for increasing a friction coefficient; the outer wall of the butt joint-type steel pipe is sleeved with two semicircular buffer steel gaskets in mutual butt joint; the outer wall of the buffer steel gasket is provided with positioning grooves; and each positioning groove is provided with a steel hoop fastened by a bolt. The drilling simulation device can actually simulate the actual use condition of the bolt, and the bolt drawing test result accuracy is improved; the simulation device can be removed after the test is completed, the stressed deformation condition of an anchorage agent in the drilling hole or the bolt can be observed and simulated, and the bolt can be analyzed and improved; and the whole device is high instrength, assembly and disassembly are convenient, and repeated use is facilitated.

Description

technical field [0001] The invention relates to geotechnical engineering support technology, in particular to a drilling simulation device used for pulling out tests on anchor rods (or anchor cables) in a laboratory. Background technique [0002] Bolt support is the sum of support structures with bolts as the main body. It is an active support method with a simple structure. It has the characteristics of low cost, convenient transportation and construction, and good effect in controlling the deformation of surrounding rock. Bolt support has realized a major change in the support method, can maintain the integrity and stability of the surrounding rock to the maximum extent, can effectively control the deformation, displacement and crack development of the surrounding rock, and give full play to the supporting role of the surrounding rock itself . Since the bolt came out, it has attracted extensive attention from the world's mining industry and underground tunnel construction...

AI Technical Summary

Problems solved by technology

The disadvantages are: ① the inner surface of the steel pipe is relatively smooth, and the simulation of the rough hole wall on site is insufficient, and the actual working conditions of the bolt cannot be well simulated; ② since the complete steel pipe is used, it is difficult to observe the The stress and deformation of anchoring agent or anchor rod; ③ For the test of resin anchor and cement mortar anchor, the steel pipe used for simulation can only be used once; ④ For the friction of hydraulic expansion anchor and pipe seam anchor For the test of anchor bolts, the inner surface of the pipe wall is rubbed smoother after the anchor bolts are pulled out, and the reuse rate is low; , due to the high strength requirements for drilling, the wall thickness requirements for simulated drilling steel pipes are also increased accordingly, increasing the cost of simulated drilling steel pipes

The disadvantages are: ①The concrete pouring parts have a long maintenance period, high labor intensity and high production cost; ②The drilling holes cannot be reused; During the drawing process, the simulated drilled concrete specimen is damaged, and the wall thickness of the concrete drilled hole and the size of the specimen are required to be high.

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