Residential Drainage Inspection Chambers

Scope of Application
1. The plastic inspection chambers for residential drainage systems, CJ/T233-2006, are suitable for the design, construction, and maintenance of buried plastic drainage inspection chamber projects with a depth not exceeding 6m and no entry operation, within residential areas (residential zones, public building areas, industrial zones, etc.).
2. Construction of plastic drainage inspection chambers under general soil conditions, soft soil, permanent frozen soil, seasonal frozen soil, expansive soil, and collapsible loess conditions.
3. Areas with seismic fortification intensity of 9 degrees or below.
4. The ground load for general lanes in residential areas is designed for a total vehicle weight of 15t (rear wheel pressure 5t); the ground load for fire truck access is designed for a total vehicle weight of 30t (rear wheel pressure 6t).

Composition
1. Consists of a chamber base, shaft, cover, and accessories.
2. The chamber base is made from high molecular resin (PPB, PVC, PE) as raw material, formed by one-time injection molding.
3. The shaft can use PVC-specific pipes or HDPE-specific pipes.
4. Cover: Plastic covers can be used in green belts; composite material inspection covers, cast iron inspection covers, or reinforced concrete covers can be used for sidewalks, residential roads, or municipal roads.

Implementation Standards
Urban Construction Industry Standard CJ/T233-2006 "Plastic Inspection Chambers for Residential Drainage," China Engineering Construction Standardization Association Standard CECS227:2007 "Technical Specification for Application of Plastic Drainage Inspection Chambers in Residential Areas," National Building Standard Design Atlas 08SS523 "Plastic Drainage Inspection Chambers for Residential Areas."

Inspection Chamber Structure Diagram

Based on the bottom structure, plastic inspection chamber bases can be divided into two types: flow channel type and silt chamber type. The flow channel type base has a smooth guiding flow channel at the bottom, providing good hydraulic conditions, which facilitates rapid drainage of rainwater and sewage, preventing waste accumulation.
The silt chamber type base has a silt chamber at the bottom, with a height generally of 200mm (chamber diameter ≤315mm) and 300mm (chamber diameter >315mm), commonly used in rainwater pipeline systems. Sediment settles at the bottom of the chamber when rainwater passes through. 

Municipal Drainage Inspection Chambers

Scope of Application
The plastic inspection chambers for municipal drainage, CJ/T326-2010, are suitable for the design, construction, and maintenance of buried plastic drainage inspection chamber projects with a depth not exceeding 7m and entry operation, within municipal roads, public building areas, residential zones, industrial zones, etc.

Composition
1. Consists of a chamber base, chamber body, offset reducer, shaft, cover, and accessories.
2. The shaft can use HDPE-specific pipes.
3. The cover can use cast iron covers, composite material covers, or reinforced concrete covers.

Implementation Standards
1. Urban Construction Industry Standard CJ/T326-2010   "Plastic Inspection Chambers for Municipal Drainage." 2. According to relevant municipal road standards and drainage specifications.