Device for sticking and straightening drawing head by adopting drilling and pulling method

Abstract

The invention relates to a device for sticking and straightening a drawing head by adopting a drilling and pulling method. The device is characterized by comprising a drawing head and a sleeve (3) matched with a concrete core sample, wherein a diaphragm (2) is arranged in an inner hole of the sleeve. An outer cylindrical surface of the sleeve is a conical surface which is matched with a core sample ring groove (5) so as to facilitate the obtaining of the coaxility of the drawing head (1) and a core sample (6). The device for sticking and straightening the drawing head, which is disclosed by the invention, is placed into the ring groove formed by drilling of a special drilling machine, so that the drawing head can be stuck at the central position when the drawing head is stuck without sideslip; particularly when a detection surface is vertically arranged, the sliding even falling of the drawing head can be avoided; and in addition, structural adhesive for sticking can be prevented from leaking into the ring groove and the problem that the drawing head is difficult in sticking in the testing process of the axial tensile strength of concrete on a structure solid body is solved.

Description

technical field [0001] The invention relates to a device for testing the tensile strength of concrete on site, in particular to a pulling head sticking and straightening device of a concrete core sample pulling instrument. Background technique [0002] The test of the compressive strength of structural concrete is very mature at home and abroad, and many corresponding technical standards have been formulated, but the axial tensile strength of concrete is often more important for the design of new projects, the renovation and reinforcement of old buildings, such as checking the structure Whether the concrete is cracked, crack width, etc. At present, there is no instrument and method for directly testing the tensile strength of concrete on the structural entity at home and abroad. There is a method in the standard that makes a standard specimen in the laboratory and puts it on a universal testing machine for axial tensile testing. The disadvantage of this method is It is inco...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing concrete core sample extraction instrument cannot be adjusted between the pulling head and the sticking end surface of the core sample. Paste of the head

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