The inspection well is set up for the maintenance of urban underground infrastructure such as power supply, water supply, drainage, sewage discharge, communication, cable TV, gas pipes, and street lamp lines, and is convenient for installation. It is generally installed at the intersection of pipelines, turning places, pipe diameter or slope changes, and at certain distances on straight pipe sections, which is convenient for regular inspection of ancillary structures. 　　The inspection well is used in the construction area (residential area, public building area, factory area, etc.) to buried plastic drainage pipes with an outer diameter of no more than 800mm and a buried depth of no more than 6m. Or slope changes, water drops, etc., for the convenience of regular inspection, cleaning and dredging, or well-shaped structures made of plastic injection molding or bricks for downhole operation and inspection. The plastic integrated injection molding inspection well means that the main well block that constitutes the inspection well is formed by one-time injection molding, the well shaft socket adopts a 360-degree ring-shaped bearing platform, the well body and the bottom of the well seat use mesh reinforcement ribs, and each socket adopts ring-type reinforcement. Rib design. Depending on the number and angle of connection, there are initial well bases, straight well bases, 45-degree elbow well bases, three-way well bases, and four-way well bases. In order to adapt to various drainage conditions, plastic inspection wells are equipped with plastic integral injection molding accessories such as reducing joints, confluence joints, and multi-joints in the wellbore. To ensure the smoothness and tightness of the entire drainage system. 　　1) Plastic drainage inspection well projects with buried drainage pipes with an outer diameter of no more than 1200mm and a buried depth of no more than 8m in building areas (residential areas, public building areas, factory areas, etc.), urban and rural municipalities, industrial parks, old city renovations, etc. Design, construction and maintenance. 2) Construction of plastic drainage inspection wells under the conditions of general soil, soft soil, seasonal frozen soil and collapsible loess; 3) Areas where the seismic fortification crack degree is 9 degrees or below. 4) The ground load of the general driveway is designed according to the total vehicle weight of 15t (the rear wheel pressure is 5t); the ground load of the fire lane is designed according to the total vehicle weight of 30t (the rear wheel pressure is 6t). 5) The groundwater level is designed to be no higher than 1.0m below the ground;