An auxiliary traction and protection device for a trans-hole acoustic wave test transducer for horizontal holes

Abstract

The invention discloses an auxiliary traction and protection device for a trans-hole acoustic wave test transducer aimed at a horizontal hole, which comprises a traction main body and a controllable traction device. The traction main body includes a rubber protective cover, a transducer, a support and a spliced ​​hollow steel pipe. The rubber protective cover is wrapped on the surface of the transducer, and the transducer is fixed on the spliced ​​hollow steel pipe through the support. The controllable traction device includes fixed pulleys, steel columns, telescopic sleeves, adjusting bolts, pipe clamps, housings, stepper motor drivers, stepper motors, drums, couplings, control circuit boards, controllers and traction ropes. This device uses a rubber protective sleeve to wrap the transducer to prevent the transducer from being damaged by the contact friction between the transducer and the hole wall during the traction movement, thereby improving the test accuracy; the controllable traction device can be used to complete the synchronous traction of the two transducers , and can control the speed and stop position of the traction, realizing the transformation of the transducer from manual traction to automatic control of traction.

Description

Technical field [0001] The invention belongs to the technical field of geotechnical engineering survey, and specifically relates to an auxiliary traction and protection device for a horizontal hole cross-hole acoustic wave test transducer. Background technique [0002] After the excavation of the tunnel, the original rock stress balance is destroyed, the strength of the surrounding rock decreases and stress concentration appears in the surrounding rock. When the stress exceeds the strength of the surrounding rock, the surrounding rock around the tunnel is first destroyed and expands to the depth. Until the three-dimensional stress balance is maintained at a certain depth, the surrounding rock has transitioned to a broken state. The loose fracture zone generated in the surrounding rock is defined as the surrounding rock loose zone. The judgment of the surrounding rock loose zone is to evaluate the overall stability of the tunnel. It is an important basis for determining the suppor...

AI Technical Summary

Problems solved by technology

The existing methods for cross-hole acoustic testing of horizontal holes have the following disadvantages: 1) One person needs to be placed at the drilling hole to move the traction body at the same time through manual pulling; 2) It is necessary to observe the traction body with the naked eye during the pulling movement process The scale on the upper part is used to move to the specified interval, which consumes a lot of manpower and the accuracy is not high; 3) During the movement, the transducer may be in contact with the hole wall to cause damage to the transducer and affect the accuracy of the test

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