Divide
1. Divided by the capacity of the communication tube block
According to the manhole, the specification is 360mm wide and 250mm high (in the standard six-hole pipe hole Stainless steel manhole Cement pipe blocks with a diameter of 90mm, referred to as standard blocks) pipe section pipe blocks or single-hole pipe pipe holes with an inner diameter of 90mm, are divided into three categories: large, medium and small.The size of the manhole installed in the communication pipeline shall be set according to the long-term capacity of thecommunication pipeline. We should not only consider the capacity of communication pipelines in the current period.
2. Divided by the direction of the manhole
Manholes can be divided into straight-through manholes, three-way manholes, four-way manholes and oblique-through manholes according to the direction of manholes. For details, see Table 1 below. Among them, the oblique manhole is divided into five types: 15°, 30°, 45°, 60°, and 75°. The angle of each oblique manhole can be applied within the range of ±7.5°.
3. Divided by the load bearing capacity of the manhole overlying
According to the load bearing capacity of the manhole overlying, it can be divided into two types: steam-20 grade and steam-10 grade.