Related information about inspection wells for buried pipelines outside the factory area? Are there any regulations?

I have an installation method for burying rigid PVC-U plastic pipes to give you a reference. Pipe installation is generally done manually. For pipes with a groove depth greater than 3m or a pipe diameter greater than DN400mm, non-metallic ropes can be used to lift the pipes into the groove. When installing the socket pipe, the socket should be installed in the direction of the flow of water, and the socket should be installed in sequence from downstream to upstream against the direction of the flow of water. The length of the pipe can be cut with a hand saw, but the section should be kept vertical and flat without damage. Small-diameter pipes can be installed manually. A wooden baffle is installed at the end of the pipe and a crowbar is used to align the installed pipe with the axis and insert it into the socket. Pipes with a diameter larger than DN400mm can be moved with tools such as hand hoists, but construction machinery must not be used to force the pipes into place. Most of the pipe interfaces are rubber ring interfaces, and the construction operation is simple, but attention should be paid to the cross-section type and sealing effect of the rubber ring. The sealing effect of round rubber rings is not good, while the sealing effect of special-shaped rubber rings with small deformation resistance and can prevent rolling is better. Ordinary bonding interfaces are only suitable for pipes below DN110mm. Ribbed coiled pipes must use special pipe joints and adhesives made by the manufacturer to ensure joint quality. 　　 The connection between the pipeline and the inspection well should be a flexible interface, and socket fittings can be used for connection. Prefabricated concrete collars can also be used to connect the concrete collars, which are built into the wall of the inspection well. The inner wall of the collar and the pipe are sealed with a rubber ring to form a flexible connection. The bonding performance of cement mortar and PVC-U is not good, so it is not suitable to lay pipes or pipe fittings directly in the inspection well wall. The intermediary layer method can be used, that is, evenly apply a layer of plastic adhesive on the outer surface of the PVC-U pipe, and then sprinkle a layer of dry coarse sand on it. After curing for 20 minutes, an intermediary layer with a rough surface will be formed. When built into the inspection well, it can ensure a good combination with the cement mortar and prevent leakage (Figure 5). In pit ponds and soft soil areas, in order to reduce the uneven settlement of pipelines and inspection wells, an effective method is to first connect a short pipe no larger than 2m to the inspection well, and then connect it to the entire long pipe, so that the settlement difference between the inspection well and the pipeline forms a smooth transition.

I don’t know if you are talking about the following standards: "Technical Specifications for Anti-Corrosion Coatings for Petrochemical Equipment and Pipelines" SH 3022-1999 SHT3517-2001 Petrochemical Steel Pipeline Engineering Construction Process Standard SYJ 4020-1988 Specifications for the construction and acceptance of petroleum asphalt anti-corrosion layers on buried steel pipelines. Specifications for the construction and acceptance of anti-corrosion layers of polyethylene adhesive tape on buried steel pipelines. SY4058-93 Specifications for the construction and acceptance of on-site patching and repair of external anti-corrosion layers and insulation layers of buried steel pipelines. The above standards all have provisions on the construction and acceptance of buried pipelines.