Connecting and replacing construction method for underground water supply glass reinforced plastic sand pipes and steel pipes

Abstract

The invention discloses a connecting and replacing construction method for underground water supply glass reinforced plastic sand pipes and steel pipes. The construction method includes the steps that material and devices are prepared; reinforced concrete buttresses are lifted through a 25-ton truck-mounted crane into a groove with a water supply pipeline to be replaced; the reinforced concrete buttresses are arrayed on the same plane in order; two flange connecting pipes are lifted through the 25-ton truck-mounted crane on the reinforced concrete buttresses in front of the glass reinforced plastic sand pipes at the two ends, the end, with a groove, of each flange connecting pipe is inserted into the corresponding glass reinforced plastic sand pipe and sealed well; the two water supply steel pipes with flange plates welded to one ends are lifted through the 25-ton truck-mounted crane on the reinforced concrete buttresses besides the two flange connecting pipes in the groove, and the two water supply steel pipes and the flange connecting pipes are locked through bolts; remaining water supply steel pipes are lifted through the 25-ton truck-mounted crane on the reinforced concrete buttresses in the groove, and the water supply steel pipes are connected in a butt joint mode in order and welded well; then positioning steel plates are removed, the inner wall is coated with erosion resistant layer material, and finally filling is performed. The construction method is easy and convenient to implement and high in replacing speed and replacing 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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