Method for measuring insertion length of reinforcing steel bar in sleeve extending into reference object from outside

Abstract

The invention discloses a method for measuring an insertion length of a reinforcing steel bar in a sleeve extending into a reference object from outside, which comprises a self-built feature device capable of extending to form two horizontal reference objects, and specifically comprises the following steps of: a drilling position is positioned on the surface of a prefabricated part, drilling is carried out after positioning, the self-built feature device is extended into a hole channel after drilling, then the self-built feature device is opened to form a platform for point selection, namely two horizontal reference objects, an endoscope is adopted to stretch into the sleeve from the slurry outlet hole channel, point selection is conducted on the surfaces of the two horizontal reference objects to establish a horizontal datum plane, the size from the horizontal datum plane to the end of the reinforcing steel bar is measured through the endoscope, and the measured length is obtained; and the insertion length of the steel bar is equal to the sum of the drilling height and the measured length. The method has the advantages of small restricting factors during detection, low cost and wide applicability.

Description

technical field [0001] The invention relates to the technical field of prefabricated building detection, in particular to a method for measuring the insertion length of a steel bar inserted into a sleeve from outside the body into a reference object. Background technique [0002] Prefabricated buildings have the advantages of high level of industrialization, fast installation and construction, reduced labor costs, energy saving and environmental protection, etc., and have developed rapidly in China. In prefabricated concrete structures, component connection is a key factor related to the overall quality of the structure. As a commonly used form of steel bar connection, the steel sleeve grouting connection mainly depends on the effective anchorage length of the steel bar, and the insertion length of the connecting steel bar is a prerequisite for ensuring its anchorage length. In actual engineering, due to the congenital deficiency of the components at the factory, the cast-i...

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Problems solved by technology

However, on the one hand, the position of the grout outlet and grouting port on the surface of the prefabricated component is not the horizontal position of the sleeve, and the deviation may even exceed 50mm, so the drilling position may be deviated; on the other hand, due to the unevenness of the floor and the The construction deviation of the thickness of the bottom joint is relatively large, which leads to a certain deviation in the measurement and positioning of the floor as the reference point, which often makes the position of the drilling hole incorrect and cannot provide accurate height data for the reference surface, which directly affects the follow-up of the insertion length of the connecting steel bar. Test results

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