The upvc tube is made of polyvinyl chloride resin as a carrier. It has excellent characteristics such as accurate temperature sensing, timed melting and rapid absorption of the active ingredients of the additive when weakening the attraction between the molecular chains of the resin. At the same time, the world famous calcium-zinc composite heat stabilizer is used. During the process of high temperature and melting of the resin, the neutralization and absorption of hydrogen chloride can be captured, suppressed, and absorbed, and a double bond addition reaction with the polyolefin structure is performed to replace the active and unstable chlorine atoms in the molecule. Thereby effectively controlling the catalytic degradation and oxidative decomposition of the resin in a molten state.
Since it is not electrically conductive, it is not easy to react with acid. Alkali. The salt reacts electrochemically, so it is acid. Alkali. Salt is difficult to corrode, and the upvc tube is also lightweight. The advantage of convenient transportation. Upvc pipe specific gravity is about 1.4 (cast iron pipe specific gravity is about 7.4), which is one-fifth of the weight of cast iron pipe. The use of upvc pipe can save transportation cost 1/10-1/5 by using cast iron pipe. Loading and unloading construction is very convenient. Often, the construction environment of the water supply pipeline is relatively difficult, and the construction site is muddy, which can reduce the labor intensity of workers. It is ideal to shorten the construction period. And using the upvc tube can achieve this ideal. The upvc tube is light in weight and can be moved manually during the installation process. Generally, there is no need to use machinery. For example, a vc200 long 6m upvc pipe has a weight of about 55Kg, while a cast iron pipe of the same diameter length has a self-weight of 304Kg. When installed, the upvc pipe is used for one person, and the cast iron pipe needs to be used by three people or mechanically to drop the pipe, thus greatly reducing The labor intensity of the workers and the saving of working hours and construction costs.
Upvc pipe manufacturing process:
Through computer processing, the PVC resin, stabilizer, lubricant, coloring agent and filler are kneaded, and then pumped into the extruder hopper. While heating, the material is pushed forward by the rotation of the screw, so that It gradually forms a molten plasticizing belt, enters the die of the machine head, extrudes a soft tubular product, and then forms a upvc pipe through a series of processes such as vacuum sizing, spray cooling, spray marking, traction cutting, and expansion.
Advantages of upvc tube:
1 For the boiler room, the steam washing machine room can be selected with cast iron pipe, which not only solves the high temperature resistance but also overcomes the shortcoming of the upvc pipe pressure difference.
2 The bottom elbow of the riser is the most noisy. It can be set up with a pipe butt at the bottom of the main pipe, and the elbow is wrapped with a flexible material (styrofoam plate, etc.) to make the water flow in the riser fall and can be achieved. The purpose of sound.
3 According to the specification, the expansion joint should be added below the drain pipe interface tee. However, due to the special structure of the expansion joint, if it is added here, the material of the accessory will be wasted. If the pipe clamp or the inspection port is installed, it is not only convenient but also convenient to check whether the expansion joint has a expansion joint during construction, and also can reduce some accessories and save. material. In the construction, the expansion joint must be left 10~15mm, otherwise it will not be able to play the telescopic effect, but the leakage of water will increase due to the rubber ring.
4 upvc pipe is connected with the cast iron pipe socket, the outer wall of the UPVC drain pipe can be roughened, and then the asbestos cement can be directly used for mouth opening and maintenance. It is connected with the same galvanized steel pipe with the same pipe diameter (usually used for drainage horizontal pipe in roof rainwater). Because of its similar outer diameter, it is difficult to carry out the practice. The practice is to reduce the diameter of the galvanized welded steel pipe to 150mm. After the anti-corrosion, directly insert the upvc tee pipe fittings, use asbestos cement to seal the mouth, and strengthen the hangers at both ends. This method does not affect its drainage function, but it can save installation space and simplify the construction process. It is a simple and feasible connection method.
5 The roof of the upper roof is 5m long and can only be fixed by the plate. Typhoon weather in the south has occurred, and the riser is not stable. In practice, a layer of galvanized iron with a thickness of 2mm is placed on the outside of the riser, and a flexible material (such as asbestos cement, hemp, etc.) is filled between the iron and the outer wall of the upvc pipe, and the bottom of the iron is connected to the floor through the angle steel. This method can not only fix the riser, but also is more beautiful.
The 6upvc pipe construction specification does not require the pipe wall to be roughened, and the construction personnel have not paid attention to it. According to this operation, the bonding effect is affected. In the actual construction supervision work, this should be explained in detail, and it can be requested and supervised and executed in the written materials to “make the sandpaper before bonding†to ensure the bonding effect.
7 A rubber gasket water stop ring can be added between the rainwater bucket cover and the bucket flange to prevent the waterproofing layer of the floor from being properly prepared, and the rainwater seeps into the waterproof and heat insulation layer when the rainwater bucket is blocked (mostly expanded perlite, water absorption) Good performance, not easy to dry), causing water seepage accidents.
8 The outer wall of the pipe at the pipe through the hole should be roughened to make it more tightly integrated with concrete to achieve waterproofing. It can also be equipped with a rubber water stop ring for waterproofing.
9 During the construction process, pipe supports and hangers shall be made in time according to the requirements of the regulations to prevent pipe breakage.
10 All horizontal sections can be required for irrigation test, and the riser is tested for water supply (slightly improved with the specification requirements). The water seepage point can be found in time to ensure the overall construction quality, so as to prevent economic leakage caused by water leakage to the lower decorative ceiling material.
Use of upvc pipe:
There are three main types of connection for upvc pipes, namely rubber interface (RR), bonding (TS) and flange connection. If water leakage occurs after construction, it can be repaired by changing the tube, applying the bonding method, glass fiber method, welding, etc.
1. For the large area damage of upvc pipe, it is necessary to replace the whole pipe, and the method of replacing the pipe with double socket joints can be adopted.
2. The solvent method can be used for the treatment of leakage at the solvent bond. At this time, the water in the tube is drained first, and a negative pressure is formed in the tube, and then the adhesive is injected on the pores of the leaking portion. Due to the negative pressure inside the tube, the adhesive will be sucked into the pores to achieve the purpose of stopping leakage.
3. The sleeve bonding method is mainly for the leakage of the small holes and joints of the upvc pipe. At this time, the same diameter pipe with a length of 15~20cm is selected, and the longitudinal pipe is cut longitudinally, and the inner surface of the casing and the outer surface of the pipe to be supplemented are roughened according to the method of bonding the joint, and the sleeve is tightly attached to the water leakage after being glued.
4. The glass fiber method is formulated into a resin solution by using an epoxy resin and a curing agent, and after impregnating the resin solution with a glass fiber cloth, it is evenly wound on the surface of the upvc pipe or joint leakage, and becomes a glass fiber after being solidified. Because the method is simple in construction, easy to master in technology, good in plugging effect and low in cost, it has high promotion and use value in anti-leakage trapping.
Upvc tube installation:
1. The adhesive must be shaken before use.
2. The upvc pipe and the socket part must be cleaned up, and the smaller the gap of the socket is, the better.
3. Use abrasive cloth or saw blade to roughen the joint surface, evenly brush the rubber in the socket, and brush the glue twice. After the glue is dry for 40~60s, insert it into place. At the same time, pay attention to increase or decrease the glue according to the climate change. time.
4. Do not touch the water when bonding. After the pipe is in place, it must be placed in the ditch. After the joint is dry, backfilling should be started 24 hours after the joint is dry. When backfilling, the pipe will be filled with sand to leave the joint and then backfilled in large quantities.
5. When the upvc pipe is connected with the steel pipe, the steel pipe joint must be wiped and glued, and the upvc pipe is heated and softened (but not burnt), then placed on the steel pipe and cooled down. If conditions are added, the pipe clamp is more it is good.
Upvc pipe application areas:
1. Tap water piping project (including indoor water supply and outdoor municipal water pipe), because the upvc pipe has the advantages of acid and alkali resistance, corrosion resistance, no rust, no scaling, protection of water quality, and avoiding secondary pollution of water quality, vigorously promote production. Today, environmentally friendly products, as an ideal "green building materials" to protect human health, have been widely used in China and the world.
2. Water-saving irrigation piping project, the use of upvc spray-drip irrigation system can save 50%-70% compared with ordinary irrigation, while saving fertilizer and pesticide dosage, crop yield can be increased by 30%-80%. Today, China lacks water resources and agricultural production is lagging behind, which has great social benefits for promoting the development of China's water-saving agricultural production.
3. Construction piping engineering.
4.upvc tube has excellent insulation ability and is also widely used as a post and telecommunications cable conduit.
5. Upvc tube is resistant to acid and alkali and corrosion, and many chemical plants are used as infusion piping. Others are also used in sinking engineering, medical piping engineering, mineral brine transportation piping engineering, and electrical piping engineering.
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