The basic composition of the U-PVC spiral pipe drainage system is the same as that of the ordinary drainage system, that is, the drainage riser receives the sewage from the horizontal branch pipes of each floor, and is finally discharged from the bottom. The uppermost end of the riser is connected to the atmosphere by the top vent pipe.
First, the characteristics of U-PVC spiral drain pipe
1. The drainage noise is low.
According to the Shanghai Building Materials Institute and the Fujian Provincial Institute of Construction, the noise of the U-PVC pipe (ie smooth pipe) with smooth inner wall is about 2~4bB less than that of the traditional cast iron drain pipe. In October 1996, the Institute of Sound Research of Tongji University compared the spiral tube and the light wall tube. The result is that the spiral tube is 5~7bB less than the light wall tube; that is, the spiral tube is 3bB lower than the cast iron tube, and the drainage noise is low. The power is 50% of the cast iron pipe. A large number of engineering examples also fully confirm this point, that is, the spiral pipe will only hear the rustling sound when it drains, which is much lower than the flushing noise of the sanitary appliance, which really plays the role of silence.
2. Prevent damage to the floor drain seal.
Since the center of the drainage riser forms a clear air column, the amount of pressure fluctuation in the pipe is reduced. Really avoid the appearance of the upper layer users like the ordinary cast iron pipe and the light wall pipe system due to the negative pressure value and the bottom user due to the positive pressure, causing the water seal damage and deteriorating the living environment. At present, the minimum water seal height for ground leakage in China is 50 MM, which can fully meet the requirements of spiral drain pipes.
3. The drainage capacity is large and it is not easy to block.
4. The comprehensive cost of the project is 20%-30% lower than that of the traditional cast iron pipe, and the color is soft, which overcomes the cold gray of the tone of the cast iron pipe.
2. U-PVC spiral drain pipe construction needs attention.
1. The order length of the pipe.
Generally, when the user does not specify the length of the pipe, the manufacturer often supplies the length of the pipe that is customarily produced. The factory length of the pipe is generally 4M or 6M, and in the actual installation of the project, each pipe is cut off for a long period, resulting in waste. Therefore, it is best for the construction unit to draw a large-scale piping diagram before ordering. According to the height of the floor, the piping is enlarged according to the height of the floor. The required length of the pipe is obtained. According to the length of the pipe, the material is not wasted and the work is reduced. the amount.
2. Connection of pipes.
The U-PVC spiral tube uses a nut extrusion apron sealing joint. This joint is a sliding joint that can be used for expansion and contraction. Therefore, the proper clearance should be considered according to the procedure after the pipe is inserted. Avoiding the trouble of individual operators in the construction process, the reserved clearance is too large or too small, and the temperature changes in the future, and the pipeline deformation causes leakage. The prevention method is to first determine the reserved gap value according to the construction temperature at that time. In the construction of each joint, insert the mark on the insertion tube first, and the insertion mark can be achieved during the operation.
3. Often in some high-rise building designs, in order to enhance the resistance to water flow impact at the bottom of the riser of the spiral pipe drainage system, a flexible drainage cast iron pipe is used for the steering elbow and the discharge pipe. The outer wall of the plastic pipe inserted into the cast iron pipe socket shall be roughened to increase the friction and fastening force of the filler with the caulking.
4. The snorkel that protrudes from the roof is affected by the temperature difference between indoor and outdoor, and the storm is attacked. It often occurs that the joint between the snorkel tube and the roof waterproof layer or the heat insulation layer produces a telescopic crack, which causes the roof to leak. The prevention method is that a water blocking ring of 150MM-200MM above the top layer can be made around the roof snorkel.
5. Two problems that often occur in the construction of buried discharge pipes: The first is that the laying of pipes below the indoor floor is not carried out after the backfill is compacted. After the backfilling is completed, although the irrigation experiment is qualified before the compaction, the pipeline interface is cracked and deformed after use: the other is the hidden pipe, the left and right sides and the upper part are not covered with sand, causing the pointed hard object or the stone to directly touch the pipe. The outer wall causes damage or leakage of the pipe wall. The above two buried pipe discharge problems must be paid attention to during construction.
6. The U-PVC spiral pipe installation in the room should be carried out continuously after the completion of the clay wall finish. In fact, due to the construction period, most of them are synchronized with the decoration after the completion of the main structure. This will cause the smooth and beautiful surface to be contaminated. The best solution is to use the plastic cloth to wrap and protect the U-PVC spiral tube in time, and then remove it after completion. Furthermore, it is necessary to strengthen the finished product protection of the U-PVC spiral pipe during the construction process, and it is strictly forbidden to climb on the pipe, fasten the rope, use the scaffolding board, use it as a support or use it for other purposes.
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