How to lay underground piping?

The engineering pipeline that may be involved in site design includes all aspects of urban public facilities. Generally, there are water supply pipes, drainage pipes, gas pipes, heating pipes, power cables and communication cables. Among them, the water supply, gas and heat pipes are under pressure, but the drainage pipes are self-flowing without pressure.

Matters Need to be Paid attention to Laying Underground Piping

(1) On no account can the laying of various pipelines affect the safety of buildings, and in addition, and pipelines should be prevented from being damaged by corrosion, subsidence, vibration, load, etc.

(2) Pipelines should be laid comprehensively according to their different characteristics and requirements, and at the same time, pipelines that have an impact on safety, sanitation, and interference prevention should not be co-trenched or laid close to each other.

(3) The direction of underground pipelines should be laid along the road or parallel to the main building, which should strive for straightness, shortness and proper concentration. Not only that, but also to minimize turns and minimize crossings between the pipeline itself and between the pipeline and the road.

(4) The pipeline parallel to the road should not be laid under the driveway. When it is unavoidable, the construction personnel should try to arrange the pipelines with larger burial depth and less renovation under the driveway.

General Principles of Pipeline Layout

(1) Principles of Underground Pipeline Layout

① The reasonable arrangement sequence of underground pipelines should be from the outer edge of the building foundation to the center of the road. Construction personnel should arrange the following pipes from shallow to deep: telecommunication cables, power cables, heat pipes (ditch), compressed air pipes, gas pipes, oxygen pipes, acetylene pipes, water supply pipes, rainwater pipes, and finally sewage pipes.

② The basic layout order of underground pipelines is outward from the outer edge of the building foundation, and equally, the horizontal order from the near and far of the building should be: power pipeline or telecommunication pipeline, gas pipe, heating pipe, water supply pipe, rain water pipe, Sewage pipe.

③ Underground pipelines should generally be laid outside the roadway. Unless special difficulties are required, reinforcement measures can be taken, and then the water supply and drainage pipes with less maintenance are laid under the roadway.

④Drinking water pipes should not be laid together with drainage pipes and other pipelines containing acid and alkali corrosion and toxic materials. Moreover, workers need to avoid laying DC power cables and other metal pipelines close to each other.

⑤Pipelines with similar properties and close burial depth should be arranged as close as possible, and conditionally, they can be laid together.

(2) Principles for Laying above Ground and Overhead Pipelines

① The above-ground and overhead pipelines should not affect the transportation and pedestrian safety.

② The lighting and ventilation of the building should not be affected.

③ The interference-free pipelines should be laid on the same bracket as much as possible.

(3) Handling principles when contradictions occur in pipeline laying

① Temporary pipeline yields to permanent pipeline.

② Pipes with small diameters yield to those with large diameters.

③ Bendable pipes yield to unbendable pipes.

④ The newly designed pipeline yields to the original.

⑤ Pressure pipes yields to gravity flow pipes.

⑥ Pipelines with small construction volume yield to those with large construction volume.

General Situation of Pipeline

(1) The buried depth of the gas pipe is about 1.5 meters on the road surface, the bottom of the pipe or the bottom of the flowing water.

(2) The covering layer of the cable trench (pipe) is not less than 50cm. Based on the elevation of the top of the sidewalk or green belt, its elevation is between 2.5 and 2.9 meters.

(3) The buried depth of the integrated communication pipeline is between 0.8 and 1.3 meters, and equally, the minimum buried depth of the plastic pipe under the sidewalk is 0.5 meters and the steel pipe is 0.2 meters.

(4) The thickness of the top cover of the water supply pipe is not less than 1.0 m.

(5) The communication pipeline is generally buried deeper than 1.0 to 1.2 meters, and moreover, the slope of pipeline is generally 3 to 4 ‰, and the minimum is not less than 2.5 ‰.

The layout of pipelines in the site and the pressure pipelines are closely related to the urban trunk line network, and equally, the pipelines should be connected to the urban pipeline network. Likewise, gravity pipelines are related to the drainage direction of the area and urban rain and sewage. In the comprehensive pipeline layout, it should be coordinated with the surrounding urban municipal conditions and the vertical planning and design of the site, which needs to be verified more to make the pipeline comprehensive scheme realistic. In addition, appropriate pipe fittings should be selected during design to increase the service life of the pipe, such as cam & groove coupling, instrumentation tube fitting and instrumentation valve.