Wire-broken PCCP water-nonstop prestress CFRP external wrapping and high polymer grouting compound repair method

Abstract

The invention discloses a wire-broken PCCP water-nonstop prestress CFRP external wrapping and high polymer grouting compound repair method. The method comprises the steps of PCCP excavation, PCCP supporting, PCCP outer wall treatment, PCCP externally-wrapped prestress FRP repair, grouting pipe pavement, backfilling and grouting compaction; and specifically excavation is carried out on PCCP pipes needing to be repaired, the PCCP pipes are supported through supporting devices, smoothening and primer coating of the outer walls of the PCCP pipes in the wire breakage position are carried out, FRP is wound at the damaged parts of the PCCP pipes, tensioning prestress is applied to the FRP through a prestress applying device, dipping glue is coated on the tensioned FRP to paste the FRP to be pasted on the pipe walls, pavement of grouting pipes is carried out, backfilling of the repaired pipes is carried out, and final injection of high polymers in filled soil through the embedded grouting pipes is carried out for soil compaction.

Description

technical field [0001] The invention relates to a method for repairing broken wire PCCP without stopping water, in particular to a composite repair method for broken wire PCCP outsourcing prestressed CFRP and high polymer grouting under the condition of no stopping water. Background technique [0002] Due to factors such as environmental corrosion, hydrogen embrittlement, pipe manufacturing errors, pipe installation and construction, material defects and other factors during the long-term operation of prestressed steel cylinder concrete pipes (PCCP), PCCP prestressed steel wires will break. If it is repaired, it is very likely to cause a pipe burst accident during the operation of PCCP, causing huge economic losses and social impact. [0003] Common repair and reinforcement methods include excavation repair and no-excavation repair. Excavation maintenance mainly includes post-tensioning prestressing method, outsourcing concrete method and so on. The post-tensioning prestre...

AI Technical Summary

Problems solved by technology

The post-tensioning prestressing method refers to re-tensioning the prestressing outside the broken wire pipe, and then spraying the protective layer outside the steel wire. Although this method can strengthen the pipeline structure without stopping the water, the construction process is complicated, such as repairing Strongly strengthening a single pipe also needs to consider the stress of the pipes on both sides and the treatment of the tension joints; the outsourcing concrete method refers to wrapping a new layer of reinforced concrete outside the damaged pipe, but it produces structural and structural damage along the pipe axis. Inhomogeneous rigidity, only suitable for strengthening pipes damaged by earthquakes and small-diameter pipes damaged by non-uniform settlement; no-excavation maintenance methods mainly include internal lining steel method and internal FRP reinforcement method

The lining steel plate method is to insert the steel tube as the inner liner into the inside of the damaged tube, then restore the steel tube to a circular degree similar to the damaged tube and weld it, and finally pour mortar between the inner liner and the damaged tube, This method has good durability after strengthening the pipeline, but the water supply needs to be interrupted during the repair process. It is suitable for reinforcing long pipe sections, and the reinforcement of a single pipeline is not economical; the lining FRP reinforcement method is pasted inside the pipeline For fiber fabrics, the number of pasting layers and the pasting direction depend on the damage of the pipeline. Although this repair and reinforcement method does not require excavation and does not affect the traffic around the pipe, it needs to stop water for maintenance during the repair period, and it takes a long time for large-scale reinforcement and reinforcement. After the FRP is pasted, it takes enough time to ensure the bonding strength

Generally speaking, although the current excavation maintenance method can realize the repair of PCCP broken wires under the condition of non-stop water supply, there is a problem that after excavation and maintenance, the backfilling of the soil around the pipeline is difficult to compact, resulting in the possibility of PCCP repair. Uneven settlement occurs, which affects the overall force and stability of the pipeline. Although the non-excavation maintenance method has little impact on the surrounding environment, it needs to stop the water for maintenance. PCCP is mostly used for long-distance water transmission main pipes, and the maintenance of water supply will seriously affect the city. Daily life water for residents

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