Experiment method and experiment member for testing bond strength of concrete and coal, rock or concrete

Abstract

The present invention relates to the field of mechanical property testing of concrete, and discloses a method for testing bond strength of the concrete and coal, rock or concrete, the method comprises the steps of in situ drilling of a specimen to be bonded, production and conservation of the specimen to be bonded, anchoring of the specimen, mounting of the specimen, opposite-pulling, reading and calculation of the bond strength; the present invention also discloses an experiment member for testing the bond strength of the concrete and the coal, rock or concrete, the experiment member comprises two bonding cylinders and two pulling rods, one ends of the bonding cylinders are provided with threaded holes, one ends of the pulling rods are provided with external threads, the bonding cylinders and the pulling rods are threaded in connection, and the bonding cylinders respectively sleeve both ends of the specimen to be tested. The experiment method and the experiment member can simply and quickly directly measure the bond strength of the concrete and a spray object.

Description

technical field [0001] The invention relates to the technical field of concrete mechanical performance testing, in particular to an experimental method and component for testing the bond strength between concrete and coal, rock or concrete. Background technique [0002] Bolt shotcrete support is the most important technology for the permanent support of coal mine shafts, bottom shaft yards and main development and preparation of roadways. At the construction site of the underground roadway, the concrete is sprayed onto the surface of the surrounding rock of the excavated roadway, and after it is solidified and hardened, it is closely bonded and covered with the surrounding rock as a whole. In addition, the concrete of a certain thickness (such as 200mm) in the underground is not sprayed at one time, but sprayed in layers (50mm each time), so that the concrete sprayed later and the concrete sprayed first are on the contact surface of the two. There is also a certain bonding ...

AI Technical Summary

Problems solved by technology

These two methods have their own advantages and disadvantages, but there is a common problem that the bond strength is obtained indirectly through the test results, which will inevitably lead to inaccurate and discrete test data.

Moreover, the test devices of these two methods are complicated, the size of the test piece is huge, and the experimental process is time-consuming and laborious, especially the latter uses a motor during the sampling process.

As we all know, the underground geological environment is complex, gas occurs, and the explosion-proof level of the test equipment is high, especially for mines with high gas or coal and gas outbursts, and the pull-out test in the roadway will cause potential danger to underground safety.

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