A construction method for connection and replacement of glass fiber reinforced plastic sand-inclusion pipe and steel pipe for underground water supply

Abstract

A construction method for connection and replacement of an underground water-supply fiber-reinforced plastic mortar pipe and steel pipe, comprising the following steps: (1) materials and equipment are prepared; (2) reinforced concrete support piers are lifted using a 25 ton truck crane into a trench where replacement of a water supply pipeline is required and the piers are aligned and arranged on a same plane; (3) two flanged connecting pipes respectively are lifted using the 25 ton truck crane onto the reinforced concrete support piers in front of fiber-reinforced plastic mortar pipes at two ends, one extremity having a groove is inserted into the fiber-reinforced plastic mortar pipes and sealed; (4) two water-supply steel pipes welded to a flanged plate at one extremity respectively are lifted using the 25 ton truck crane into the trench and onto the reinforced concrete support piers beside the two flanged connecting pipes and are locked tight using bolts with the flanged connecting pipes; and, (5) the remaining water supply steel pipes are lifted using the 25 ton truck crane into the trench and onto the reinforced concrete support piers, aligned and joined with each other and welded together, then the retaining steel plates are removed, an anticorrosive coating material is coated onto the inner wall, and finally earth is refilled. The present construction method has the advantages of easy and convenient construction, rapid replacement speed, and high quality.

Description

【Technical field】 [0001] The invention relates to a construction method for connecting a municipal underground water supply steel pipe, in particular to a construction method for connecting and replacing an underground water supply FRP sand pipe and steel pipe. 【Background technique】 [0002] At present, many underground water supply pipes are made of FRP sand pipes, which have the advantages of simple structure, cheap price, and good sealing performance. However, the FRP sand-filled pipe has poor pressure bearing capacity and cannot withstand excessive external pressure. Once the foundation facilities such as bridge piers are laid next to the underground FRP sand-filled pipe, the FRP sand-filled pipe will not be able to withstand the pressure imposed by these facilities. explosion due to pressure. Therefore, once the above-mentioned situation is encountered in many places where the underground water supply pipes are FRP sand-filled pipes, the FRP sand-filled pipes must be ...

AI Technical Summary

Problems solved by technology

However, the FRP sand-filled pipe has poor pressure bearing capacity and cannot withstand excessive external pressure. Once the foundation facilities such as bridge piers are laid next to the underground FRP sand-filled pipe, the FRP sand-filled pipe will not be able to withstand the pressure imposed by these facilities. explosion caused by pressure

Therefore, in many places where the underground water supply pipes are FRP sand pipes, once the above situation is encountered, the FRP sand pipes must be replaced. However, the current replacement construction method is inefficient and the quality is not good enough. This phenomenon urgently needs to be improved.

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