The specifications of the nine-hole grid tube are only BF9-33 and BF9-28. The nine-hole grid pipe is made of polyvinyl chloride as the main raw material, supplemented with toughening agent, anti-aging agent and other auxiliary additives. The sheath and sub-tube are integrated into one extrusion molding.

When burying the nine-hole grating pipe, attention should be paid to the depth (from the top of the pipe to the road surface). It should not be less than 0.5M under the sidewalk, and should not be less than 0.7M under the roadway. It should not be less than 0.7M under the tramway. The crossing (from the top of the pipe to the bottom of the track) should not be less than 1.00M, and the intersection with the railway (from the top of the pipe to the bottom of the track) should not be less than 1.5M. When laying nine-hole grid plastic pipes in multiple layers, they should be filled in layers and The burial depth should be appropriately increased.

If these requirements cannot be met, protective measures such as concrete encapsulation or steel pipes should be used.

Extended information

1. When laying nine-hole grid pipes, the pipe hole combination arrangement and cross-section should be the same as the pipe hole layout and cross-section of the cement pipe head. In order to ensure that the pipe holes are arranged neatly and evenly spaced, the nine-hole grid pipes should be fixed with frames or spacers at certain intervals. The vertical joints between the two rows of pipes should be filled with M7.5 cement mortar, and the fullness should be no less than 90.

2. After the nine-hole grid pipe is laid, if the soil covering the top of the pipe is less than 0.8M, protective measures should be taken. For example, using brick trenches and steel plate concrete covers or steel plate concrete encapsulation, etc., for the safety of communication pipelines, add warning signs 300MM above the pipes in general areas. The warning signs can be in the form of strips, bricks, covers, etc. .

3. In order to enhance the safety and reliability of pipelines, in actual pipeline design, the burial depth should be increased according to the combination of pipe groups. In urban areas, pipes with fewer holes should be buried to 1-1.2M.

Baidu Encyclopedia-Nine-hole grid tube

Baidu Encyclopedia-Nine-hole grid tube