A device for testing the tensile force under anchor of a prestressed clip-type anchorage

Abstract

The invention discloses a testing apparatus for a tensioning force under an anchor for a prestressed clamping type anchoring device. The testing apparatus comprises a steel strand tensioning force detection component and a steel strand elongation detection component, wherein the two components are connected coaxially. A pressure loading component applies an acting force on a prestressed steel strand; an oil pressure identification module identifies and records the change of the acting force; the a steel strand tensioning force detection component detects a strain pressure of the prestressed steel strand under the acting force; and the steel strand elongation detection component detects a strain elongation value of the prestressed steel strand. The steel strand tensioning force detection component, the steel strand elongation detection component, and the oil pressure identification module send respective detected data to an analysis controller for processing; calculation is carried out to obtain a tensioning force-elongation relation curve of the prestressed steel strand. According to the invention, the tensioning force under anchor of the steel strand can be identified rapidly and accurately; and the normal construction progress is not affected.

Description

technical field [0001] The invention relates to a device for testing the tensile force under anchorage of a prestressed clip type anchor. Background technique [0002] Prestressed anchoring is an active anchoring technology, which can effectively increase the stability of rock and soil or retaining structures, offset or reduce the tensile stress on the structure caused by external loads through preloading, slow down the occurrence of cracks, and ensure structural safety, etc. It has been widely used in geotechnical reinforcement and prestressed concrete structures. [0003] The prestressed structure under anchorage belongs to the category of concealed structure, and the quality control is difficult. The traditional tensioning technology uses manual manual control of the oil pump to load. The loading operation and the accuracy of the calibration of the oil gauge will affect the tension. Although the use of intelligent tensioning equipment has greatly improved the tensioning ...

AI Technical Summary

Problems solved by technology

The steel bar cutting method partially destroys the concrete structure outside the prestressed bundle and cuts off some steel strands to detect the prestressed size, but there are problems such as complicated operation, irreversible damage, and inability to take effective measures for the detected insufficient prestressed situation; The release method can test the stress of the structure, but the cutting speed, cutting temperature, etc. are the disturbance factors of the test stress

The detection accuracy of nondestructive testing is not high, and the destructive testing will cause damage to the structure. Neither of the two testing methods can accurately evaluate the tensile force of the prestressed steel strand anchor under the condition of no damage to the structure.

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