We should all know that most of the cement pipes are buried underground, and the depth of the buried pipes has a great influence on the cement pipes. The editor of Wanxin will tell you about the treatment methods to reduce the buried depth of the pipeline in the cement pipeline planning, and explain in detail the applicable conditions of various methods, the problems that need attention in the planning, and the values of related planning parameters.
1. Set up a retention pond method
Principle: In this method, a retention pond is used in the sewage discharge system to block substances that are liable to settle in the sewage, so as to avoid pipeline blockage caused by the decrease of the slope of the pipeline and the decrease of the flow rate, thereby reducing the planned flow rate and the slope of the cement pipeline as appropriate Take the value to reduce the buried depth of the cement pipeline. In detailed planning, a general septic tank can be used as a retention pond. Because the trapping pond mainly blocks the easy sediment in the sewage and does not require anaerobic fermentation to purify the sewage, the volume of the sewage part can be 1/3 of the normal septic tank when the capacity is calculated, and the volume of the entire trapping tank is about normalized 1/2 of the septic tank. When planning the sewage pipeline, the slope of the pipeline in front of the retention pond cannot be reduced. The value of the planned flow velocity and the planned slope of the sewage pipeline after the anti-fouling treatment of the retention pond can be reduced by 20% to 30 compared with the value specified in the standard. %. This method is applicable to residential districts or factories where the terrain is flat and the starting point (control point) of the pipeline is a long distance from the access point of the municipal sewage pipe network.
2. Overflow well discharge method
Principle: As shown in Figure 1, the sewage is mainly discharged into the municipal sewage pipe through the overflow well. The pump is used as an auxiliary to remove the accumulated water in the overflow well and the upstream sewage pipe. All standing water is ok. In order to reduce operating costs, a sewage booster pump can be started before daily peak water use to drain the water in overflow wells and upstream pipelines. In this way, it can prevent sewage from staying in the pipeline for a long time, causing siltation, and often flushing the stagnant pipe section, and it is also beneficial to the ventilation of the pipeline and the removal of harmful gases in the pipeline. When planning a cement pipeline system, the slope of the cement pipeline above the overflow water level should be minimized to reduce the length of the water accumulation pipe section and the amount of water accumulated in the drainage system. Small, should ensure that the water flow has a certain scouring intensity to the pipeline when the pipeline is idle. This method is suitable for the control point of the cement pipeline is close to the access point of the municipal cement pipeline network, so that the residential cement pipeline is connected to the municipal pipeline network, and the residential district or factory area with small planning is also applicable to the rainwater drainage system. When used in rainwater drainage systems, rainwater is discharged through overflow wells, and the rainwater raising pump is opened only after each rain and when the pipeline needs to be dredged and protected, in order to remove the accumulated water in the pipeline.
3. Pipeline penetration method
Principle: When the cement pipeline is buried when it encounters the current pipeline or the storm sewer is interspersed, the pipeline penetration method is used, which can reduce the depth of the pipeline and is not easy to block. The principle of this method is shown in Figure 2.A check well is set at the pipe crossing to allow another pipe to pass through the well.The key is to ensure that the water passing area in the well (the area of the shaded part in the figure) is greater than or equal to that of the pipe being penetrated. The cross-sectional area and the size of the water passing area in the well can be controlled by the size of the through-hole inspection well. The principle of pipe running is that small pipes run through large pipes, and current pipes run through planned pipes.
The above three methods of reducing the buried depth of cement pipelines can make use of existing conditions to solve the problem of insufficient buried depth of urban cement pipelines without violating the rules and obtain certain economic benefits.