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Four-hole grid tube, four-hole pipe, perforated square tube segment length and bend 1. Communication plastic pipe segment length should be the position of the manhole. In a straight line the route, its segment length should not exceed 200m, in the highway, its segment length of not more than 300m, and each segment length should be equal. 2. Each pipeline should be laid straight. When the case of the road around the bend or need other pipes, pipe segment curved straight pipe length should be less than the maximum allowable segment length. 3. Qu bend radius bend pipe shall not be less than 10m, bending angle should be as large as possible pipe center. The same section of pipe should not have reverse bending (ie "S" shaped bend) bend a pipe or a bent portion of the center less than 90 ° angle (ie "U" shaped curve). Four-hole grid tube, four-hole pipe, the pipe shall be perforated base following provisions: 1. In areas with good soil, dug trenches after the ditch should be compacted sand or fine soil backfill 50mm. 2. In soil less fortunate areas, it should be done after the concrete foundation dug trenches, based on the first 50mm sand or fine soil backfill. 3. In the soil is rocky areas, should backfill sand or fine soil after 200mm dug trenches. 4. Or in the soil for the backfill soil unstable regions, should be concrete foundation steel plate. 5. In poor soil, high water table, flow of sand or silt areas, dug trenches should be carried out after the foundation reinforcement, concrete pipes and encapsulation. 1. When the pipe into a building or person (hand) hole, close to buildings or people (hand) hole should be not less than 2m length of reinforced concrete foundation and encapsulation. Four-hole grid tube, four-hole pipe, perforated square tube a few points should be noted that after the completion of the laying of: 1. In the general area, 300mm at the top of the plastic tube group should be added caution tape. 2. In the special zone, 300mm at the top of the plastic tube group should be added to the concrete slab or ordinary Brick protection. 3. In the range of around 20cm plastic pipe should sift fine soil compaction, soil compaction divided house than 20cm available. It prohibited the use of stones, sediment or other backfill materials. 4. In the pipe laying process should enter a manhole nozzle tight closure. 5. When the plastic pipe without burial, aging and protective measures should be taken against mechanical damage.