Construction Scheme of Plastic Inspection Well I. transportation In the process of loading, unloading, handling and transportation, the plastic inspection wells should be handled carefully and lightly, and should not roll, drag or throw.When mechanical equipment is used for hoisting, non-metallic rope (belt) should be used for hoisting. Two, storage 1It should be placed in a well-ventilated shed and away from heat sources. 2When temporarily stored in the open air, sunscreen measures should be taken. 3Mixed storage with oil or chemicals is strictly prohibited. 4Fire protection measures or facilities shall be provided in the warehouse. 5The finished wells should be stacked, and no loading or extrusion should be allowed on the top to prevent the deformation of the bare wells. 3. Key Construction Points 1Pits and foundations A. The pit should be excavated at the same time as the pipe trench, and the main line of the well seat should be on the same axis as the pipeline in the pipe trench during excavation.The pit slope is consistent with the pipe ditch slope.When excavating a pit, overexcavation of the foundation soil shall not be disturbed; if the foundation soil is disturbed, remedial measures shall be taken in accordance with the relevant provisions of the current Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering GB50268 and the soil quality of the foundation soil.The depth of the mud chamber should be excavated locally according to the selected specifications for inspecting wells and pits with mud chamber rainwater.Pit excavation should be based on the selected specifications, consider the main line deviation factor of the wellbore, and the pit wall of the deviated end should be level with the pipe trench. B. Construction in areas with high groundwater level or in rainy season, measures to increase drainage and reduce water level should be taken. C. Foundation of plastic inspection wells: undisturbed undisturbed undisturbed undisturbed soil during earthwork excavation can be covered with medium-coarse sand or coarse sand cushion with a thickness of 300 mm; if the foundation soil is too poor, sand-rock cushion with a thickness of 500 mm can be compacted manually. 2Inspection well nozzle installation A. The installation sequence of the connection between the wellbore and the pipeline of the plastic inspection well should start from the upstream section of the nozzle, and be installed in the sequence of well-pipe-well-pipe, and gradually extend to the downstream branch pipe and the trunk pipe. B. The construction method of wellbore joint and pipeline connection should be consistent with the construction method of pipeline connection of the same type of joint. C. The connection between the wellbore and the inlet pipe needs to be changed in diameter. When the inlet pipe diameter is smaller than the wellbore joint diameter, the top of the pipe should be flat. When the wellbore outlet pipe interface is larger than the downstream pipe, the bottom of the pipe should be flat. D. When adjusting the gradient of pipeline with variable angle joint or spherical joint, when the diameter of pipeline is 315 mm, special tools should be used, and chain wrenches should not be used. E. The installation of additional joints shall be based on the size of the wellbore and the diameter of the connecting pipeline. Special tools shall be used to open holes in the wellbore. The circumferential edges of the holes shall be smooth, and the installation of additional joints shall not reverse the slope. F. During the construction period of high groundwater level or rainy season, technical measures should be taken to prevent the wellbore from floating when the pipeline (including inspection wells) is installed (but no irrigation test has been carried out). 3Wellbore Installation A. The length of the wellbore shall be the height from the bottom of the socket connecting the wellbore to the designed surface, and the net distance from the top of the wellbore to the surface shall be subtracted.When the elevation of ground or pavement is difficult to determine accurately, the wellbore length can be reserved appropriately. B. The wellbore should be inserted vertically into the wellbore.When wellbore is inserted, hammer beating shall not be used, and special tightening tools shall be used. 4Backfill A. Backfilling shall be carried out after the acceptance and acceptance of drainage pipelines (including pipelines and

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