The connection between the straight pipe section of the double-wall corrugated pipe, the connection between the straight pipe section and the elbow, the straight connection, etc. It should be produced by the manufacturer. The thickness of the thin steel plate of the connector should not be less than the thickness of the pipe. The interface should be smooth, free of twists, bumps, and depressions. The semi-round head galvanized bolt for connection should be inside it. The bolt length should be appropriate. After tightening, the exposed length should be 2 5 teeth. For pipes that are installed horizontally, the joints of the straight pipe section should be located about 1 4 between the two supports and hangers as far as possible.
1.In general, it is not manufactured at the construction site. When required for special reasons, the existing pipe can be used to retrofit the non-standard bend to the straight. When transforming the cutting line, gas welding or electric welding cutting is not allowed, and cutting tools should be used. The modified pipe must be smooth.
2.According to GB50168, expansion joints are set at the expansion joints where the pipe passes through the building, so as to ensure that the bellows and the cables laid in the pipe can expand and contract freely without damaging the building. Because in new construction, the installation of the pipes is usually carried out a few months or even a year after the completion of the concrete structure works, and the shrinkage of the concrete gradually decreases. Generally, the amount of expansion will not exceed the width of the expansion joint of the building.
3.If it is found or learned from the civil construction unit that the expansion joint of the building is large and may exceed L, it should be expanded according to the actual situation. The pipe passing through the expansion joint has a long straight pipe section on at least one side, which should exceed 30m, or the pipe of the straight pipe section on both sides of the expansion joint adds up to 30m, and there is no horizontal or vertical elbow in the middle. So as to leave the expansion margin of the cable (or wire) in the tube, which should be L.