Pull-out test device and calculation method for measuring bonding strength between concrete and surrounding rock
A bonding strength and concrete technology, applied in measuring devices, mechanical devices, instruments, etc., can solve problems such as difficulty in embedding embedded parts, high temperature of shotcrete, and difficulty in finding curing agents, saving measurement time, The effect of reducing working time and protecting health
Inactive Publication Date: 2018-09-04
HEBEI UNIV OF ENG
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Problems solved by technology
However, in the water diversion tunnel with high ground temperature, according to its design requirements, a certain amount of quick-setting agent needs to be mixed into the concrete mixture, so the sprayed concrete can reach a certain strength within a short time after the spraying is completed, and the embedded parts It is very difficult to embed it, so it is difficult to implement the reserved test piece drawing method in such a site
The commonly used drilling core drawing method is generally to drill a circular hole with a certain depth in the center of the core, use epoxy resin curing agent to implant steel bars for curing, and then use a bolt puller to pull out, but usually It takes a long time to solidify under the ground, which seriously affects the measurement progress of the bonding strength between shotcrete and surrounding rock, and because the temperature of shotcrete is very high, it is difficult to find a suitable curing agent
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[0026] Below in conjunction with embodiment this patent is further described:
[0027] Such as figure 1 As shown, the drawing test device and its calculation method for measuring the bonding strength between concrete and surrounding rock include a top cover 3, the center of the top cover 3 is provided with a through screw hole, and the circumference of the lower part of the top cover is provided with three circular arcs convex in shape;
[0028] Three arc-shaped anchor pieces 4 are arranged under the top cover 3, and a piece of arc-shaped outer protrusion is arranged on the top of each arc-shaped anchor piece 4;
[0029] The outer side of the three arc-shaped anchor pieces 4 is provided with a hollow cylindrical sleeve 5 with a thick top and a thin bottom that can wrap the three arc-shaped anchor pieces. The top of the cylindrical sleeve 5 is fixed with Screw 1, the screw 1 on the top of the top cover 3 is provided with a nut 2;
[0030] The top cover 3 and the arc-shaped a...
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The invention discloses a drawing experiment apparatus for measuring the bonding strength of concrete to surrounding rocks, and a calculating method thereof. The structure of the apparatus comprises a top cover, the center of the top cover is provided with a through screw hole, and the circumference of the lower portion of the top cover is provided with three arc-shaped inner protuberances; three arc-shaped anchor sheets are arranged below the top cover, and the top of each of the arc-shaped anchor sheets is provided with an arc-shaped outer protuberance; and the outer side of the three arc-shaped anchor sheets is provided with a hollow cylindrical sleeve having larger top and smaller bottom and used for wrapping the three arc-shaped anchor sheets, the top of the cylindrical sleeve is fixedly provided with a screw, and the screw at the top of the top cover is provided with a nut. The apparatus has the advantages of use convenience, simple installation and operation, and effective protection of workers from high temperature damages.
Description
technical field [0001] The invention relates to a pull-out test device, in particular to a pull-out test device with simple and reliable structure, convenient assembly and strong practicability for measuring the bonding strength of concrete and surrounding rock and a calculation method thereof. Background technique [0002] A water conservancy project in Qirehatar, located in the Kashgar area of Xinjiang, my country, found serious high ground temperature phenomena during the excavation of the water diversion tunnel. However, it is difficult to guarantee the bonding strength between shotcrete and surrounding rock under high temperature environment, so a pull-out test device for measuring the bonding strength between shotcrete and surrounding rock is needed for timely detection of shotcrete on site The bonding strength with the surrounding rock ensures the safe operation of the hydraulic project. [0003] At present, there are three methods for testing the bonding strength of...
Claims
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IPC IPC(8): G01N19/04
Inventor 宿辉段宇李向辉马超豪黄顺马飞宁珍杨云霄
Owner HEBEI UNIV OF ENG