Lever-type drawing device for testing anchoring performance of planting bar and implementation method thereof

Abstract

The invention relates to a lever-type drawing device for testing the anchoring performance of a planting bar and an implementation method thereof, which specifically belongs to the technical field of the reinforcement modification of civil engineering. The lever-type drawing device for testing the anchoring performance of the planting bar comprises a lever force measuring device which is arranged above a concrete substrate, wherein the lever force measuring device comprises a rigid crossbeam, a support point part of the rigid crossbeam is hinged with a support saddle, the lower end of the support saddle is rigidly connected with a pull pressure sensor, the other end of the pull pressure sensor is rigidly connected with the concrete substrate, one end of the rigid crossbeam is fixedly connected with the planting bar through a connection member, and the other end of the rigid crossbeam is connected with a loading device. Based on the lever principle and combining the equipment such as the pressure sensor, the drawing device for testing the anchoring performance of the chemical planting bar which is anchored in the concrete substrate and the implementation method thereof have remarkable advantages compared with the traditional method for testing the stress performance of an anchoring connection node.

Description

technical field [0001] The invention relates to a lever-type pulling device and its implementation method for testing the anchorage performance of planting bars, in particular to a chemical pull-out device based on the principle of leverage, combined with pressure sensors and other equipment, and anchored in concrete substrates after testing. The invention relates to a drawing device for the anchorage performance of planting bars and an implementation method thereof, which belong to the technical field of civil engineering reinforcement and transformation. Background technique [0002] Rebar planting technology is a relatively simple and effective connection and anchoring technology for concrete structures; it can be implanted with ordinary steel bars or bolted anchor bars; it has been widely used in the reinforcement and reconstruction projects of existing buildings, such as : Remedy for missing buried steel bar or steel bar deviated from the design position during construc...

AI Technical Summary

Problems solved by technology

Most of the existing pulling devices for testing the anchorage performance of chemical planting bars are designed with reference to Appendix K of "Code for Design of Reinforcement of Concrete Structures" GB50367-2006, that is, using through-hole hydraulic jacks, pressure sensors and top fixtures to test chemical planting bars. When the puller is assembled, the centers of the through-hole hydraulic jack and the pressure sensor must coincide with the center of the chemically planted bar. The following disadvantages exist when the puller is used to test the anchoring performance of the planted bar: First: Determining the anchorage performance of chemically planted bars under constrained conditions cannot reflect the actual anchoring performance of chemically planted bars under unconstrained conditions; The exposed length of the chemical planting bar is longer or it needs to be equipped with a stronger connecting sleeve and a drawing tool bar; third: In actual operation, due to the deviation of the center of the center jack and the planting bar, the chemical planting bar is subjected to tension bending Joint action; fourth: due to the poor load-bearing stability of the through-hole hydraulic jack, this device is not suitable for determining the influence of the creep of the planting glue on the anchorage performance under long-term load; fifth: during the actual anchorage performance test, Due to the rebound of the chemical planting reinforcement, it may cause damage to the test device or injury to personnel, etc.

[0004] In view of the fact that the test results of the above-mentioned device cannot reflect the actual anchoring performance of the chemically planted bars under unconstrained conditions, existing technicians have adopted the technical measure of an overhead through-hole hydraulic jack, that is, adding an overhead jack between the above-mentioned pulling device and the concrete substrate. Rigid supports (steel beams, etc.), although the improved test device can solve the problem of anchorage performance testing under unconstrained conditions, other shortcomings still exist, and due to the addition of rigid supports, the improved device is not suitable for planting bars. Anchoring Performance Test in Dense Conditions

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