Drainage of drainage and sewerage pipelines can be roughly divided into the following methods: mechanical flushing, hydraulic flushing, manpower dredging, bamboo (glass fiber reinforced plastic bamboo) dredging, winch dredging, drill pipe dredging, etc. The general methods of dredging sewage drainage pipelines They are carried out by some professional dredging companies. The specific method is to set up a winch near the upstream and downstream of the sewage pipeline that needs to be dredged, and use the bamboo piece or the rope stringer to draw the steel rope on one winch to another. The position of the winch depends on the alternate action of the winch to make the pipe tool scrape up and down in the sewage pipe, so as to achieve the purpose of moving and removing sludge and cleaning the pipe. With the continuous advancement of science and technology, the methods for dredging sewage pipes are also increasing. In actual use, appropriate choices can be made according to needs.
Large-caliber sewage pipes are mainly divided into two types of construction methods: slotted laying and trenchless construction in municipal water supply and drainage projects. Today, large-caliber sewage pipes manufacturers mainly elaborate on the construction methods of slotted laying facilities.
(1) At the time of construction, pay attention to the specifications of pipeline laying according to the relevant regulations, and inspect according to product standards, and remove pipes that do not meet the standards. If the pipeline is laid under the carriageway, the thickness of the top soil of the pipe shall not be less than 0.7 meters. If it is necessary to pass through an obstacle, a protective sleeve made of steel bars, etc. must be installed. The pipeline should be laid in a straight line when laying. If it is necessary to lay a flexible interface with a broken line, the angle of the longitudinal axis of the connected pipes should not exceed 2 °. When the buried depth of the pipeline is lower than the bottom surface of the foundation of the building, the pipeline should not be laid in the range of the compression zone of the foundation diffusion angle under the foundation of the building. When the groundwater level is higher than the height of the trench trench excavation, measures should be taken to reduce the groundwater level during construction to prevent trench instability. During the entire installation and backfilling process, it should be noted that there is no water accumulation at the bottom of the trough or the bubble trough is affected. freeze.
(2) According to the pressure of the external environment, PE pipes with different stiffness should be selected.
(3) When excavating the trench, the width of the bottom of the trench of the large-diameter sewage pipe should be reasonably determined to meet the construction requirements for manual operation. During the construction process, the trench should not be over-digged. If over-digging is accidentally carried out, natural graded sand and gravel materials should be used for landfill.
(4) The foundation of the large-diameter sewage pipeline adopts sand cushion foundation, and grooves should be reserved at the interface part for the interface operation, and the interface is filled with sand after construction. For the general soil texture base, only one layer of 0.1M sand cushion is needed. If it is a soft soil foundation and the bottom of the trough is below the groundwater level, a layer of gravel foundation with a thickness of not less than 500px should be laid.
(5) When installing the down pipe, the groove width, groove depth, foundation surface elevation, inspection well, etc. should be strictly inspected to ensure that the operation items meet the construction requirements and regulations before proceeding to the next step To improve construction quality.
(6) After the inspection is completed, the next step is to connect and install the large-diameter sewage pipe. The manual installation method should be used to install non-metallic rope sliding pipe, so that the pipe is placed on the gravel foundation smoothly. The order of the socket pipe installation should generally be in the order of the socket in the direction of water flow, the socket in the direction of the flow of water, and in order from low to high. When carrying out the interface process, first clean the two sides of the mouth and apply lubricating oil. After coating, align the center line and wait for the connection. The connection between the pipeline and the inspection well can be made by using an intermediary layer. The pipeline between the two parts is pre-made with a plastic adhesive and coarse sand that can be well bonded to the pipe, and then connected with 1: 2.5 cement. The mortar is built into the wall of the inspection well, so that the joint between the well and the pipe is dense, the bottom flow channel is smoothly joined with the inner wall of the pipe, and the pipe mouth is flush with the inner wall of the well.
(7) Strict inspection should be carried out after the installation of PE pipeline is completed. If the inspection is qualified, trench backfilling should be started. During trench backfilling, the range from the bottom of the pipe to the top of the pipe must be manual backfilling. . When backfilling, make sure that there is no debris in the trench. In addition, the degree of compaction of the backfill chest should not be less than 95%, the top of the tube 500mm or more should not be less than 80%, and the other parts should not be less than 90%. Attention should also be paid to the selection of tamping equipment to avoid damage to the pipeline structure during construction.