Method for detecting concrete beam anchor lower prestress and device for realizing method

Abstract

The invention discloses a method for detecting the concrete beam anchor lower prestress and a device for realizing the method. The device for detecting the concrete beam anchor lower prestress is arranged on an anchor rope of a concrete beam, which is tensioned and is not grouted; and a working anchor is locked at the root part of the anchor rope extending out of the concrete beam. The device comprises a counter-force cylinder, a through jack and a working anchor which are sequentially arranged on the anchor rope in a serial mode; the counter-force cylinder is sleeved outside the working anchor; the bottom of the counter-force cylinder is open; an opening surface is attached to and bears a concrete beam section of the working anchor; the top of the working anchor is provided with a through hole for the anchor rope to pass through; the jack is arranged on the top surface of the counter-force cylinder for tensioning the anchor rope; the working anchor is installed on the jack for locking the anchor rope; and the device also comprises a displacement and load tester which is connected to the anchor rope in series and is positioned between the counter-force cylinder and the working anchor. The method for detecting the concrete beam anchor lower prestress and the device for realizing the method can standardize the quality control behavior of a prestress bridge and improve the integral quality level of the prestress bridge.

Description

technical field [0001] The invention relates to a prestress engineering testing device and method, in particular to a method for detecting prestress under anchorage of a concrete beam and a device for realizing the method. Background technique [0002] Prestressed anchorage engineering has been widely used in concrete engineering (generally referred to as anchorage engineering) such as bridge construction, dam reinforcement, high and steep slope reinforcement, and underground cavern reinforcement. Due to the use of prestressed anchor cable technology in these anchoring projects, a large prestress can be applied to the project to be reinforced in advance during the construction process of the structure to be reinforced and before delivery, so that the reinforced structure remains stable. [0003] The construction of the prestressed bridge girder is divided into the following three stages: the first stage, pouring the prestressed beam concrete, and reserving the tunnel for the...

AI Technical Summary

Problems solved by technology

The tensile stress and elongation of prestressed tendons are the two most important control indicators for the quality of prestressed tendons. If they are not properly controlled, the loss of tensile stress will easily occur, resulting in under-tensioning or over-tensioning, which will affect the prestressed concrete. The use effect and life of components

[0004] The index for controlling the tension stress and elongation value of the existing anchoring project is to record the tension stress and elongation value of the construction tension during the tensioning process of the prestressed tendon in the second stage of anchorage, and draw the P-S curve of the construction tensioning process. And through the P-S curve to analyze whether the prestressed tendon tension of the anchoring project is qualified. However, the P-S curve only reflects the index value of the prestressed tendon in the construction process. After the prestressed tendon is stretched and anchored, the anchor Whether the lower prestress is qualified or not, there is no testing method at present

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