PVC pipe drainage pipe is sanitary grade PVC resin as the main raw material, adding the right amount of stabilizer, lubricant, filler, brightening agent and so on by plastic extruder extrusion molding and injection molding machine, through cooling, curing, shaping, inspection, packaging and other processes to complete the production of pipes, pipe fittings.

the general specifications of the commonly used PVC pipe drainage pipe are as follows: nominal outer diameter:32mm, 40mm, 50mm, 75mm, 90mm, 110mm, 125mm, 160mm, 180,200 mm, 250mm, 315mm, 400mm, 500mm, the length of PVC-U pipes such as 630mm is generally 4m or 6m, and other lengths shall be determined by both parties through negotiation.

Underground water pipe PVC pipe ABS(acrylonitrile butadiene styrene copolymer) unplasticized polyvinyl chloride (UPVC) CPVC(post-chlorinated polyvinyl chloride) PP

Product advantages

1. Excellent surface hardness and tensile strength, high pipe safety factor.

2. Good aging resistance, normal service life can reach more than 50 years.

3. the pipe has excellent corrosion resistance to inorganic acid, alkali and salt, and is suitable for industrial sewage discharge and transportation.

4. Small friction coefficient, smooth water flow, not easy to block, less maintenance work.

5. the material has high oxygen index and self-extinguishing.

6. Pipe line expansion coefficient is small, 0.07mm/℃, small deformation affected by temperature. Low thermal conductivity and elastic modulus, excellent freezing resistance compared with cast iron drainpipes.

7. Pipe and pipe fittings can be connected by bonding, with simple construction method, convenient operation and high installation efficiency.

8. Good water tightness: PVC-U pipe installation, whether using adhesive or rubber ring connection, has good water tightness.

Installation instructions

1. Saw pipe and groove:

the length of the saw tube is determined layer by layer according to the measured and combined with the size of the connecting pipe fittings. the pipe sawing tools should be fine-tooth saws, cutting knives and pipe cutting machines. the fracture should be smooth and the section should not have any deformation. the socket to be bonded can be filed into 15o~ 30O groove with medium plate file. the length of the groove is generally not less than 3mm, and the thickness of the groove should be 1/3 to 1/2 of the thickness of the pipe wall. after the bevel is finished, the debris should be removed.

2. Protection of socket interface:

after connecting the socket interface, the extruded adhesive should be cleaned with cotton yarn or dry cloth dipped in a little acetone and other detergent. According to the performance of the adhesive and climatic conditions until the interface solidified. the curing time should be appropriately extended during winter construction.

Design method

Plastic pipe formula design method

1.PVC plastic pipe technology and design principle

(1) the resin should choose PVC-SC5 resin or PVC-SG4 resin, that is, the degree of polymerization in 1200~1000 PVC resin.

(2) Thermal stabilization system must be added. According to the actual production requirements, pay attention to the synergistic effect and antagonistic effect between heat stabilizers.

(3) Impact modifier must be added. CPE and ACR impact modifiers can be selected. According to the other components in the formula and the plasticizing capacity of the extruder, add 8 to 12 parts. CPE has low price and wide source, and ACR has high aging resistance and welding Angle strength. Construction burying requirements

First, in the subgrade unit before the construction of the base should be carried out in the horizontal belt drainage pipe buried.

Two, grooving: according to the design of the drawing design and the position of the design pile number measured by the surveyor to carry out manual grooving. the width of the PE pipe groove should be 1-2 cm wider than the diameter of the pipe, and the groove depth should be 23 cm below the surface of the road bed. the groove length requires that the inner side is 10 cm from the middle line, the outer side extends to the slope, and the excavated section extends to the inner wall of the side ditch. the slope of the groove should follow the lateral drainage slope of the road, not reverse slope, and ensure that the water in the road is discharged out of the roadbed. Pull the wire before slotting to make sure it is straight.

Three, take over: each PVC pipe at both ends of the interface must be covered with rubber rings tightly, to avoid leakage.

IV. Pipe laying: after cleaning the bottom of the tank and connecting the pipe according to the length of the tank, put the pipe into the tank. at the end of the central separation belt, tighten the mouth with gunny cloth to prevent debris from entering the pipe and causing blockage.

Five, backfill: select the excavation of fine soil backfill, or the use of sand backfill, must remove large stones, backfill to artificial tamping, the top surface of backfill soil shall not be higher than the road bed, to be below the surface of the road bed 1~2 cm is appropriate, otherwise it will be compressed by vehicles and unable to water.

Six, clean up: the remaining soil after backfilling should be immediately removed, clean up the road,PE pipe remaining soil should be concentrated in the soil collection site and other designated places, not randomly discharged on the road.

Seven, fill the bottom of the base after construction, in the brush good slope, in accordance with the design size of the outlet, casted trapezoidal outlet plate, the plate is shaped by wood mold pouring, before pouring the slope, and nail into 3 25cm long bamboo stick, for stability.

Eight, pay attention to the lowest point of the vertical curve of the route to ensure that there is drainage pipe, to ensure that the road surface does not water. Super high pressure pipe buried requirements in fill road, road bed after submit in time according to the position of the drawings design measure lofting set pipeline and well location, artificial cooperate with small mining machinery slot, the bottom of the channel slope comply with the design requirements, ensure the smooth drainage groove width not less than, groove width is not less than design 47 cm, digging out the residual timely keep up appearances. in the filling section, in order to ensure the thickness of the soil covering the pipe and ensure that the PVC pipe is not damaged, the bottom of the tank should be reduced by 20 cm. in the stone excavation section of ultra-high subgrade, after the completion of the base and then reverse excavation construction. Application

PVC drainage pipe has been more and more widely used in various industries, the main material of PVC drainage pipe is PVC,PVC has strong heat resistance and corrosion resistance, which is why PVC is widely used as a reason.

in order to make the building facade more beautiful, the indoor rainwater drainage system is more and more widely used. Indoor rainwater pipe is generally designed according to non-pressure flow, but because the rainwater flow is sometimes larger and more concentrated, there are two states of gravity flow and pressure flow in the pipe, so the indoor rainwater pipe is required to have stronger pressure resistance than other drainage pipes.

PVC drainage pipe is the substitute of traditional drainage pipe with better physical and chemical properties. It has a smooth inner wall and less friction resistance than conventional drainage materials, so the horizontal pipe installation slope is smaller, which can improve the building's indoor net height. at the same time,PVC drainage pipe weight is lighter, for the cast iron pipe one-fifth, easy to transport and operation; Adhesive connection, easy installation and maintenance; the price is lower than the conventional drainage pipe, greatly reducing the project cost; Strong corrosion resistance, widely used in construction sewage and rainwater pipeline system. in addition, the widespread use of PVC drainage pipe is conducive to saving steel, which is of great significance to alleviate the situation of steel shortage in China. Compared with cast iron pipe and steel pipe,PVC-U drainpipe has the disadvantages of low pressure and weak impact resistance. in addition, although PVC-U drainpipes are fire-resistant materials, there is a possibility of fire spreading upward along the drainage riser for indoor open-coated pipes.

PVC drain pipe line expansion coefficient is large, in the construction of the need to install expansion joint to solve its expansion problem. According to the calculation formula of expansion amount of PVC-U drainage pipe caused by environmental temperature change:

Delta L = l. a. Ats

Where L- pipeline expansion (m);

L- Pipe length (MK

A - Linear expansion coefficient, using 610-5~ 8x10-5-m /(m℃);

Delta t - temperature (℃)