Long Kang plastic inspection chamber construction 

 A, and foundation pits 

 1, pits should be excavated trench at the same time, excavation competent well base line should be in the pipeline trench in the same axis. Pits the same slope and trench slope. Excavation pits, soil over-excavation shall not disturb the base; if the base soil is disturbed, they should be present "to the sewer construction and acceptance of" GB 50268 of the relevant provisions of the soil under the foundation soil to take remedial measures. Mud room with sink hole rain check Well, the specifications should be based on use, local excavating silt chamber depth. Excavation pits should be based on the specifications used to consider factors well base charge of line bias, the bias may Kengbi should end flush with the trench. 

 2, the high water table areas or construction during the rainy season, there should be drainage, lowering the water level measures. 

 3, inspection wells should be based on local geological investigation based on information and backfill downdrag by calculation. When no data, based on the drawings can be checked well. 

 B, check the installation of well over 

 1, the checks Well blocks and pipeline connection installation sequence should start with the upstream section of pipe connected households to begin the installation, to well - tube - well - tube, insert the disease gradually to the downstream branch, trunk extension. 

 2, seat fittings and pipe connections well construction methods, should be the same type of pipe joints connected to the same construction method. 

 3, the well base and import tube, adjustable discharge pipe connections required by Reducing joint, when the diameter is less than well base interface to import the diameter should be top-level access control; well base is greater than the downstream exhaust pipe nipple should be the end of the tube flush. 

 4, the pipe joints or using variable angle ball joint to adjust the slope, when the diameter is 315mm, special tools should be used and shall not use the chain wrench. 

 5, the installation of additional joints, should be based on size and connection shaft diameter of the pipe, using special tools on the wall opening, the circumference edge of the hole should be flat, not down slope to install additional connectors. 

 6, or the rainy season in the high water table during construction in the pipeline (including inspection wells) installed (but not for irrigation test) should be taken to prevent the floating body of the technical measures well. 

 C, shaft installation 

 1, the length of shaft should be well base bottom connected to the shaft of the socket design of the high ground, minus the top shaft to the ground distance. Local surface or road difficult to accurately determine the elevation, the shaft length may be appropriate to reserve margin. 

 2, bore into the well base should be kept vertical. Wellbore plug when not using the hammer beating, should be tightened using special tools. 

 D, backfill 

 1, the backfill should be at the drain line (including pipes and inspection wells) after acceptance, and backfill the trench with the pipe at the same time. 

 2, available before backfilling sand bags, drill rod, wood supporting the well base, shaft fixed, and should exclude pit, groove water. 

 3, the backfill material: from the bottom of the tube to the tube based on the top surface of 0.5m above the trench backfill material within the chip can be gravel, sand particle size less than 40mm large, high (middle), calcium fly ash, the coarse sand or trench digging out the good quality soil. 

 4, backfill shall not be used mud, garbage, and permafrost, etc., and shall not be entrained rocks, bricks and other objects with edges and corners of the lump. 

 5, the maximum depth of frozen soil on the ground than or equal to 1.0m, in the context of the frozen layer should be at least 100m around the wellbore within the sand fill. 

 6, the backfill should be symmetrical artificial layered backfill, the backfill density consistent with the pipeline, and may not produce a shift and tilt the shaft, non-mechanical backfilling. 

 E, covers installation 

 1, covers the accurate measurement of shaft before installing the length, cut the excess part of the shaft. 

 2, the installation covers the well should be checked to determine the nature of the transmission medium, such as water wells and water wells shall not be confused. 

 3, protective cover Block sewage inspection wells should be installed within the wellbore catchy cover. 

 4, the concentration of protective cover Block diagram based system using C20 fine aggregate concrete on-site pouring; For precast reinforced concrete, need to be designed by structural professionals. 

 F, closed water test 

 Plastic should be buried the existing drainage pipe technical specification, and the closed water test.