According to structural forms, functional requirements, and installation scenarios, cement manholes are primarily categorized into the following types, with each type catering to different engineering needs:

Categorized by structural form

• Pre-fabricated Inspection WellPre-assembled from components such as well heads, casings, covers, and connecting interfaces, on-site work is simplified to foundation preparation, component assembly, and sealing. The advantages include a short construction cycle (typically 1-2 days for a single well installation), quality control, and suitability for projects with tight schedules, such as municipal roads and residential community developments. The drawbacks are higher transportation costs for large-diameter casings and the need for specialized lifting equipment.

• In-situ cast manholeReinforcing steel bars, setting up formwork, and pouring concrete (typically C30-C40 ready-mixed concrete) according to design drawings at the construction site, then removing the formwork after curing. The advantages include flexible size adjustments for special project requirements (such as irregular wells, deep well shafts) to accommodate complex terrain; however, the drawbacks are a longer construction period on-site (requiring a 7-10 day curing period), significant weather dependence, and high technical skill requirements for the construction crew, making it suitable for industrial parks and underground pipeline projects with strong customization needs.

2. Categorized by Function and Application

• Manhole InspectionThe most common types are divided into stormwater inspection chambers (collect and discharge stormwater, no need for anti-corrosion treatment on the inner wall) and wastewater inspection chambers (transport domestic or industrial wastewater, the inner wall requires application of cementitious渗透crystalline waterproof coating or epoxy coal-tar coating to prevent wastewater leakage and soil contamination).

• Fire Inspection ManholeFire protection pipelines are equipped with fire stop valves, water meters, and other equipment within the wells. The well covers must be labeled with "Fire" signage and should be easily accessible for quick operation during emergencies. They are typically placed on both sides of roads or around buildings.

• Power/Communication ManholeOur underground power cable and communication optical cable laying products are equipped with brackets and line holes for installation. They must be waterproof and moisture-proof (with some requiring IP67 waterproofing treatment) to prevent moisture-induced short circuits in the lines. They are commonly distributed beneath sidewalks and green belts.

3. Categorized by Wellbore Depth

• Shin井The well depth is less than 2 meters, suitable for shallow pipelines in residential areas and sidewalks (such as branch drainage and courtyard sewage pipes). Personnel can operate by bending over directly without the need for a ladder.

• China Deep WellExcavation depths range from 2 to 5 meters, commonly found in municipal main road drainage networks. Steel or fiberglass ladders must be installed inside the wells for ease of access by maintenance personnel. Additionally, a fall arrest net should be set up at a height of 1.2 meters from the well opening to ensure safety.

• Deepest WellWells with depths exceeding 5 meters, commonly used in urban main pipelines and sewage treatment plant networks, require anti-slip climbing ladders and ventilation equipment (axial fans may need to be installed in some deep wells to prevent personnel from hypoxia), and the well walls must be reinforced (e.g., increasing the thickness of the steel reinforcement protective layer to 50mm) to withstand the pressure from deep soil layers.