Dam concrete pre-stressed anchor cable blasting demolition sampling method

Abstract

The invention discloses a dam concrete pre-stressed anchor cable demolition sampling method, which is characterized in that blasting demolition is conducted downwards layer by layer from top to bottom, and blasting holes should keep away from the position of an anchor cable. The demolition method comprises the steps of before integral concrete blasting demolition, breaking an anchor cable pier byusing a breaking hammer, naturally relieving internal tension of the anchor cable, and conducting fixed-point marking on the horizontal position of the sampling anchor cable before blasting demolition; performing safety protection on the surface of the dam body before blasting; performing accurate blasting and deslagging operation; breaking the residual concrete of the sampling anchor cable pier by using the breaking hammer, and transferring and storing the sampling anchor cable after the sampling anchor cable is completely cleaned out. The technological process is simple, rapid and convenient, mechanical equipment is saved, the technology is safe, various properties of the anchor cable are not affected, and an objective sample is provided for anchor cable research. The sampling anchor cable is subjected to a research experiment, analysis and research are conducted according to macroscopic inspection and mechanical property test results of the anchor cable, related research parametersare obtained, and thus safety evaluation and service life prediction of the anchor cable are conducted.

Description

technical field [0001] The invention belongs to construction technology for buildings, in particular to a sampling method for removing prestressed anchor cables in hydropower projects. Background technique [0002] Prestressed anchor cable is a construction technology that embeds steel strands into large buildings or rock formations for prestressing, and transfers the support stress of the main structure to the deep active support method. A structure anchored by the structure can more effectively bear the tensile and shear forces generated by the load, and the transmission depth of these forces is much greater than that of an unanchored structure. [0003] A typical example of the successful application of prestressed anchor cables to large-scale hydraulic structures in the world is the heightening and strengthening project of the Sherfa Dam in Algeria in the 1930s. Since then, more and more hydraulic structures have applied prestressed anchor cable technology. [0004] Th...

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Problems solved by technology

[0006] At present, the research content of prestressed anchor cables is still limited to the change law of prestressed anchor cables, the cause of failure and the influencing factors. The stress corrosion mechanism of prestressed anchor cables is still unclear, and the research on the durability of anchor cables is still in its infancy.

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