Prestressed tensioning construction method
A construction method and prestressing technology, applied in construction, building structure, processing of building materials, etc., can solve problems such as failure to meet tensile requirements, structural damage accidents, complex structural forms, etc., to avoid structural damage accidents, guarantee The effect of construction quality
Inactive Publication Date: 2011-06-08
CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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Problems solved by technology
[0002] At present, most of the prestressed structures at home and abroad are in a single direction or two directions. The prestressed structure in three directions is a new type of structure. direction), the traditional tensioning process has been unable to meet the tensioning requirements of the structure. If it is still used, structural damage accidents will occur during tensioning. Therefore, it is necessary to invent a new tensioning process to meet the structure and Construction needs to ensure construction quality
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[0018] A prestressed tension construction method, comprising the following steps:
[0019] 1. Prepare the main material tensioning equipment.
[0020] 1) The main material is steel strand; anchors and fixtures: anchors should meet the requirements of graded tension, supplementary tension and prestress relaxation; grouting materials: such as cement, expansion agent.
[0021] 2) Tensioning machines include jacks, hydraulic oil pumps, grouting machines, cutters, mixers and portable grinders, etc.
[0022] 2. Preparation before stretching.
[0023] 1) When the working strength of the concrete structure needs to reach 80% of the design strength, it can be stretched;
[0024] 2) The tensioning jack and the oil pressure gauge should be calibrated to determine the curve of the tension force and the oil pressure gauge, and the accuracy of the pressure gauge is within ±2%;
[0025] 3) The pressure bearing surface should be cleaned before tensioning, and the quality of the concrete be...
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The invention discloses a prestressed tensioning construction method, which comprises the following steps that: 1) if the tensioning control stress of a prestressed steel bundle is 0 to 15 percent sigma con, the pre-tightening is carried out longitudinally, transversely and vertically; 2) if the tensioning control stress of the prestressed steel bundle is 15 to 30 percent sigma con, the total tightening is carried out longitudinally, transversely and vertically, wherein the tightening is carried out longitudinally from a top plate and a bottom plate to a 'horseshoe' and from longitudinal beams on two sides to a longitudinal beam in the middle, the tightening is carried out transversely from a transverse bottom plate to a bottom rib and from the two ends to the middle, and the tightening is carried out vertically from two ends to the middle; 3) if the tensioning control stress of the prestressed steel bundle is 30 to 60 percent sigma con, the tightening order is the same as that in the step 2); and 4) if the stress is 60 to 103 percent sigma con, the stress is recovered to 100 percent sigma con after the load is kept for 5 minutes, wherein the tightening order is the same as that in the step 2). Through the steps, the damage to the concrete structure is avoided when being tightened.
Description
technical field [0001] The invention relates to a prestressed tensioning construction method of concrete. Background technique [0002] At present, most of the prestressed structures at home and abroad are in a single direction or two directions. The prestressed structure in three directions is a new type of structure. direction), the traditional tensioning process has been unable to meet the tensioning requirements of the structure. If it is still used, structural damage accidents will occur during tensioning. Therefore, it is necessary to invent a new tensioning process to meet the structure and Construction needs to ensure construction quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a prestressed tensioning construction method, which can avoid structural damage accidents in the concrete structure during tensioning. [0004] In order to solve the above-mentioned technical problems, the technical solu...
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IPC IPC(8): E04G21/12
Inventor 贾志营曾红革王光辉邸书茵陈谋建张明森
Owner CHINA GEZHOUBA (GRP) FIRST ENG CO LTD