Top pulling operation of joint box during CSM construction: joint box should have enough stiffness, and flow should be prevented during concrete pouring. Top pulling of lock pipe should be combined with concrete pouring, and concrete pouring record should be used as the control basis for top pulling lock pipe time.
csmTop pulling operation of joint box during construction:
The joint box should have enough stiffness, and the flow should be prevented in the process of pouring concrete. The top drawing of the lock pipe should be combined with the concrete perfusion, and the concrete perfusion record should be used as the control basis for the top drawing of the lock pipe. According to the solidification speed of underwater concrete and the test data in construction, after the concrete perfusion begins2～3hIt started pulling from side to side. After every30It is raised once a minute, and its amplitude is50～100mmThe concrete pouring is finished8Pull out the lock tube completely within hours. The detailed operation steps are as follows:
⑴ After the lock pipe is hoisted in place, the hydraulic jacking frame is installed.
⑵ Natural curing test blocks should be done when concrete is poured. The time to formally start pulling out the lock mouth tube should be based on the time experienced by the natural curing test block to reach the final setting state, and start pulling out the lock mouth tubeThe concrete should be perfused3About an hour to carry out the first pull, after every30minRaise it once, every time50～100㎜Until finally coagulated and completely pulled out.
⑶ In THE process OF top drawing joint box, THE height of TOP drawing joint box should be calculated according to the field concrete pouring record sheet. Early drawing or too much drawing is strictly prohibited.
⑷ The joint box is lifted by the hydraulic jacking frame, and the crawler crane works together to disassemble in sections.
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