Continuous load application device and application method for chemically planted concrete reinforcement

Abstract

The invention provides a sustained load application device and method for a concrete chemically planted bar. A backing plate and a bearing cover plate of the load application device can be fixed after the space between the backing plate and the bearing cover plate is adjusted; a pressure sensor, a jack, a concrete planted bar test piece and a spring backing plate are sequentially and coaxially placed between the backing plate and the bearing cover plate from bottom to top; one end of an anchor bar is inserted into the concrete planted bar test piece; threads are formed in the free end of the anchor bar, which extends out of the bearing cover plate; a spring sleeves the anchor bar and is clamped between the concrete planted bar test piece and the spring backing plate. The sustained load application process is as follows: the space between the bearing cover plate and the backing plate is set, the jack pressurizes to obtain the preset pressure, the spring backing plate is supported on the bearing cover plate, the spring is compressed to be shorter, the threads in the free end of the anchor bar are exposed out, an anchoring nut is mounted and tightened till the reading of the pressure sensor is zero, an integral test piece consisting of the concrete planted bar test piece, the compressed spring, the spring backing plate and the anchoring nut is taken out to complete sustained load application. The equipment structure is simple, load application is easy, and mass operation can be realized.

Description

technical field [0001] The invention relates to a continuous load application device and an application method for chemically planted concrete bars. Background technique [0002] The chemical method planting bar is referred to as planting bar, also known as planting bar, which is a connection technology that uses structural glue for post-anchoring of steel bars in the current seismic reinforcement engineering of building structures. It is to use chemical adhesives on the existing concrete structure or components according to the specifications of the steel bars to be used in the project with appropriate drilling diameters and depths to make the newly-added steel bars and the original concrete bond firmly, so that the newly-added steel bars are as pre-prepared. Like buried steel bars, the strength of the steel bars can be fully utilized to achieve the desired performance of the design. In view of the wide application of planting bar technology in construction engineering, th...

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Problems solved by technology

This device can apply compressive load and bending moment load to the specimen, but the performance requirements of the reaction frame are too high, and the test cost is greatly increased

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