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How to check and accept the reinforcement sleeve at the construction site
Release Date:
2014-02-15
Steps for site acceptance of reinforcement sleeve: 1. When rolling straight thread joint is applied in the project, the technical provider shall submit effective formal inspection report. 2. At the beginning of reinforcement connection and during construction, the joint connection process inspection shall be carried out for each batch of mobilized reinforcement, and the process inspection shall meet the following requirements: (1) The joint test pieces of each specification of reinforcement shall not be less than three; (2) Tensile strength test shall be conducted on the base metal of reinforcement of joint test piece; (3) The tensile strength of the three joint specimens shall not be less than the standard value of the tensile strength of the grade of reinforcement, and shall not be less than
Steps for site acceptance of reinforcement sleeve：
1. When rolling straight thread joint is applied in the project, the technical provider shall submit effective formal inspection report.
2. At the beginning of reinforcement connection and during construction, the joint connection process inspection shall be carried out for each batch of mobilized reinforcement, and the process inspection shall meet the following requirements：
(1) The joint test pieces of each specification of reinforcement shall not be less than three；
(2) The tensile strength test shall be conducted on the base metal of the reinforcement of the joint test piece;
(3) The tensile strength of the three joint specimens shall not be less than the standard value of the tensile strength of the grade of reinforcement, and shall not be less than 0.9 times the actual tensile strength of the reinforcement base metal. When calculating the actual tensile strength of reinforcement, the actual cross-sectional area of reinforcement shall be used.
3. Appearance quality inspection and unidirectional tensile test shall be carried out for on-site inspection. For structures with special requirements for joints, corresponding inspection items shall be indicated in the design drawings.
4. The on-site inspection of rolled straight threaded joints shall be carried out according to the acceptance batch. Under the same construction conditions, 500 joints of the same grade, form and specification of the same batch of materials shall be inspected and accepted as one acceptance batch, and less than 500 joints shall also be regarded as one acceptance batch.
5. Each acceptance batch shall be inspected and accepted according to the performance of class I joints, and three specimens shall be randomly selected from the engineering structure for unidirectional tensile test. When the tensile strength of the three test pieces is not less than the standard value of the tensile strength of the grade of reinforcement, the acceptance batch is determined to be qualified.
If the tensile strength of one test piece does not meet the requirements, another six test pieces shall be taken for re inspection. If one test piece still fails to meet the requirements in the re inspection, the acceptance batch is determined to be unqualified.
There are three failure modes in the uniaxial tensile test of rolled straight threaded joints: the base metal of the reinforcement is broken, the sleeve is broken, and the reinforcement slips from the sleeve. Any failure mode can be determined as qualified as long as the strength requirements are met.
Advantages of reinforced straight thread sleeve：
1. High tensile strength, meeting or exceeding the standard requirements of grade I joint in national standard jgj107-2010.
2. Good for neutral and convenient for force conduction.
3. The construction operation is convenient, and all-weather construction can be carried out in all aspects.
4. It can be prefabricated in advance to shorten the total construction period of the project.
5. The price is cheap and reduces the project cost.
6. There is no open fire operation and live line operation, which is a product promoted by the Ministry of construction.
7. As the straight thread sleeve is a machined product, the quality stability (uniformity) is high.
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