UPVC drain pipe operation process and installation process

product description:

The PVC pipe for drainage is made of sanitary grade PVC resin as the main raw material, adding various stabilizers, anti-aging agents, anti-impact agents and other auxiliaries, and is formed by extrusion processing into various specifications and hardness of different pressure grades. PVC pipe.

Product performance characteristics:

·Environmental material, in line with modern architectural style;

·The pipe fittings are complete and can be installed in various ways;

·High product strength, light weight, no combustion support, stable size, dense material, uniform wall thickness, low cost, safe and reliable use;

·The inner and outer walls of the product are smooth and flat, the water friction coefficient is small, the output flow is large, the product is not fouled, and it is not easy to block;

·Easy to install, the pipe and pipe fittings are connected by glue, the connection is safe and reliable, labor saving, time saving and work efficiency;

·The product has beautiful color, corrosion resistance, no rust, no need for painting maintenance, anti-aging and long service life;

·Complete specifications, can meet various design and installation requirements;

Application range:

Buildings, municipal construction sewage and drainage systems can also be used for ventilation pipes and internal rain pipes, as well as for industrial wastewater discharge pipes when chemical resistance is considered.

Process principle:

The UPVC pipe installation is basically the same as the metal pipe installation principle. The difference is that the UPVC pipe mainly uses adhesives to assemble different types and specifications of pipes and fittings into one system. Use a comprehensive quality management approach and set up a QC team to conduct quality and technical research. Formulate stratification, segmentation, and construction procedures from pipeline prefabrication to trunk pipe branching, etc., to ensure the high quality of pipeline installation and construction.

Construction preparation:

(1) Installation site preparation:

1. Verify the construction site. Buried pipelines should be dug trenches, the trenches should be straight, and the slope must be sloped. Concealed pipes (including equipment layers, shafts, and pipes in the ceiling) should first check the elevation of various pipes, whether there is any contradiction in the arrangement of the coordinates, and the holes are reserved, and the embedded parts have been completed. The civil formwork has been removed, the operation site has been cleaned up, and the scaffolding should be set up when the installation height exceeds 3.5 meters. The indoor wall-mounted pipeline should be installed under the condition that the structure progress is separated by two layers. The indoor horizon is good, and the rough decoration plastering has been completed. Installation site is free of obstacles.

2. Implement on-site construction conditions, that is, check the quality of the arrival of materials, including the distance from the pipeline to the pre-processing site and the installation site.

3. Submit the materials to the owner or the supervision company for inspection and declaration of the construction plan.

(2) Technical and safety disclosure:

1. Technical content:

1.1 The content of the construction plan;

1.2 Drawing requirements, specifications, standards and related regulations and key issues that should be noted during operation. In particular, the distance between the support and the hanger is set.

1.3 Product performance characteristics and instructions for use (factory instructions);

1.4 Management measures and various test records during the installation process.

2, safe delivery:

2.1 The safe use, storage and maintenance of the machine.

2.2 Safety inspection standards for high and low altitude operations.

2.3 Scaffolding erection and safety inspection standards.

2.4 According to the environmental conditions of the construction site, the size and structure of the project will be carried out before the start of construction.

Operating process and key points:

1. Prefabricated processing:

Check the appearance of the pipe and straighten the bending department. The specific method is to place the pipeline on the straightening platform, inject steam or 100 °C boiling water into the tube to make the tube soft, and self-cool and straighten under the action of self-weight.

Draw a machining sketch based on the actual situation on the site and measure the size of the broken pipe. Pipeline fracture Note: The fracture is flush, remove the internal and external burrs with a butterfly or electric grinder, and chamfer the outer edge at an angle of 15 to 30 degrees. Before bonding, the sockets should be tested and numbered first. When inserting, do not insert them all. Generally, the depth of the socket is 3/4. When bonding, the sockets are cleaned and the oil is washed off with acetone. In the part to be bonded at the pre-processing site, the inner and outer edges of the socket and the socket are horizontally roughened with coarse sandpaper. When applying the adhesive with a brush, first apply the socket and then apply the socket. Do not leak the coating. Then insert it vertically. After inserting, the socket will be rotated slightly to facilitate the adhesive uniformity and tapping with the mallet to insert the pipe segment. The mouth is in place. After bonding, it can be firmly bonded within 2 minutes at different temperatures, and should not be removed or rotated after more than 2 minutes. Multi-port bonding pay attention to the direction of the reserved port, and the three-way installation should pay attention to the direction of the water in order to naturally form the slope. At the welding interface, the counterpart must be positive.

2, support hanger system security:

The support and hanger system is the same as the metal pipe support and hanger system. The construction method of the support frame and the spacer wall is the best.

3, flat dry pipe installation:

According to the design requirements, the trench is excavated, and the hole casing is reserved to make the hanger. When the construction conditions are met, the prefabricated pipe sections are transported to the installation site according to the prefabricated pipe sections for installation. When the pipe sections are bonded, they must be carried out in order according to the bonding process. The positions of the reserved ports are accurate. After the horizontal main pipes are installed, they are closed with an inflatable rubber blocking plate to perform a closed water test. Note that after the hanging pipe is stuck, the slope is determined according to the direction of the water flow, and finally the reserved hole is sealed and the hole is closed. If the system is small, it is necessary to do a closed water test after the flat main pipe is completed. Buried UPVC pipes in construction may not be preserved, but the grooves must be compacted. When backfilling, first fill the pipe epithelium with fine sand back to 100mm, over the sieve soil, and do not damage the pipeline in real time.

4, riser installation:

Set up scaffolding as needed, and balance and secure. The prefabricated pipe segments are shipped to the site by number. First clean the reserved telescopic section, unscrew the lock nut, remove the U-shaped rubber ring, clean up the debris, and check whether the upper hole is suitable. The riser insertion should be marked with the insertion length mark, then apply the soap liquid and put on the lock. And U-shaped rubber ring. When installing, firstly insert the upper end of the main pipe into the upper layer of the hole, and insert the expansion joint vertically with force. The depth to the U-shaped steel holding card must be strong on the upper edge of the expansion joint. Then level the leveling and measure whether the distance between the top plate and the center of the three-way port meets the requirements. After the error is correct, the upper layer is reserved for the expansion joint opening and the wall surface is reserved.

5, branch pipe installation:

Set up the operation platform according to the needs, review whether the hole spare parts are suitable and trimmed, and transport the pipe sections according to the prefabricated number and install them. Pay attention to the slope requirements of the pipeline, this work should be carried out after the plastering of the surface layer.

6, appliance connection pipe installation:

Check the floor and wall practices of the building, find the reserved openings, and trim the reserved openings according to the exact size. The actual number of parts is measured and recorded, and then the machining number is prefabricated. When transporting to the site to install the bond, the reserved nozzle must be cleaned. As mentioned above, do a closed water test. In the closed water test, if it is found that the water leakage phenomenon or the leakage interface is repaired due to improper operation, the weld can be welded to fill the leak.

7, water test:

After the sanitary appliances and pipelines are all installed and the system is closed, the water-passing test is carried out system by point and point by point. The water passing test is carried out before the final step of the paint painting and cleaning process.

8. About the setting of the expansion joint:

To install UPVC drains, telescopic joints must be installed according to the location and quantity required by the design to compensate for the shrinkage and thermal expansion of the pipeline. In general:

(1) Each layer of the riser (the net height of the layer shall not exceed 4 meters) shall be fitted with a telescopic section, and the position shall be 70 to 100 mm from the floor or the squatting platform.

(2) The length of the straight pipe section of the indoor horizontal pipe is not more than 2 meters, the pipe itself is slightly compensated, and the expansion joint may not be considered; the straight pipe section of the horizontal pipe is more than 2 meters, and the expansion joint shall be installed; the expansion joint of the horizontal pipe shall be provided with water flow convergence fittings. The upstream end.

(3) The amount of expansion and contraction of the telescopic section is generally 20 to 30 mm.

Refer to the design procedure CJJ29-89 for the fixing method of the expansion joint and the rest of the details.

9. Technical points for connecting UPVC pipes by different methods:

A. The welding is carried out under hot air of 200 to 220 ° C. The weld is in the same form as the metal pipe, and the groove angle is about 35. It should be noted that the hot air sprayed by the welding torch is clean or not, which directly affects the quality of the weld. It is required to clean the hot air, no dust, no water droplets or oil droplets.

B. Flange connection, it should be noted that after the flange and the pipe are welded, the protruding part of the flange sealing surface must be flattened or leveled, and the flange gasket must be covered with the entire flange sealing surface.

C, the interface connection must strictly control the interface gap, generally required to be 0.15 to 0.3mm, the glue surface should be dry and clean, before applying the adhesive, first wipe clean with acetone or dichloroethane, the socket should be free of skew or Uneven thickness, no cracks and other defects.

D. When the casing is connected, the casing and the connecting pipe should also be coated with adhesive, and the longitudinal joint of the casing and the circumferential joints at both ends should also be welded. However, the casing connection is made after the pipe is welded to the opposite side.

E, the thread connection method is the same as the metal pipe, but it is not commonly used.