Caulking construction method for PCCP connector

Abstract

The invention discloses a caulking construction method for a PCCP connector. The caulking construction method includes the physical recovery and repair process and a double-component polysulfide sealant repair process. Large water delivery projects adopting PCCPs are increased day by day, and PCCP prestress concrete pipes of the large water delivery projects have beneficial effects not capable of being replaced by other concrete, wherein the beneficial effects mainly include the large pipe diameter, the long laying distance and the like. While for the prestress concrete pipes, in the construction process, pipe seam connection becomes the key link of the project quality. It is found in the third-time bulge test conducted on the connector after pipeline backfilling that the phenomenon that the pressure value is decreased happens to part of prestress concrete pipeline connectors, and the design requirement is not met. If pipe replacement is conducted and backfilling is conducted again, cost is high and the process is complex. The caulking construction method for the PCCP connector is put forward, and the situation that the third-time bulging is not qualified is eliminated. Cost is saved, operation is easy, and the pipe opening quality is reliable after caulking.

Description

technical field [0001] The invention relates to a caulking construction method for a PCCP pipeline interface, and belongs to the technical field of large-scale water delivery engineering construction. Background technique [0002] In the construction of large-scale water transmission projects using PCCP pipes, pressure testing of installed PCCP pipes is an important step to ensure the quality of pipeline installation. The third pressure test must be carried out on the interface after the pipeline is backfilled. The pressure test value is the design value. +0.3Mpa, and stabilize the pressure for 2 minutes, the pressure value does not drop as qualified. In the actual test, the pressure value of some PCCP pipe joints decreased during the third pressure, which did not meet the design requirements. The main reasons for the analysis are as follows: [0003] 1. Freezing and thawing in winter causes some PCCP pipe aprons to shrink and deform, resulting in irreversible deformation. ...

AI Technical Summary

Problems solved by technology

[0003] 1. The phenomenon of freezing and thawing in winter causes some PCCP pipe rubber rings to shrink and deform, resulting in irreversible deformation

[0004] 2. The micro-settlement of the pipeline foundation causes the misalignment of the rubber ring, which cannot achieve the sealing effect

[0005] 3. During the first and second presses, the experimental pressure was too high, resulting in deformation of the apron

[0006] If the cost of pipe replacement and backfilling is too high and the process is complicated, it is urgent to propose a caulking construction method for PCCP pipe joints to solve the unqualified situation of the third suppression

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