Abstract: The invention provides a corrugated plastic inspection well and relates to the field of inspection wells. The corrugated plastic inspection well comprises a well seat, a wellbore and a closing well ring. The upper end of the well seat is connected with the wellbore, and the upper end of the wellbore is connected with the closing well ring. The corrugated plastic inspection well is characterized in that reinforcing ribs are arranged on the closing well ring, and the wall of the wellbore and the wall of the well seat are both provided with annular reinforcing rings; the wellbore is composed of a hollow-wall PVC pipe, a double-wall HDPE corrugated pipe, an HDPE winding pipe and an adjustable wellbore body; the well seat is formed through one-time injection molding, or pouring molding or rotational molding; and connection with variable pipe diameters and angles is realized through reducing joints, sealing rings and other accessories. According to the corrugated plastic inspection well, the circular rigidity and the bearing strength of the closing well ring are improved, and the service life of the inspection well is prolonged.

Abstract: In Japan, the total length of aging irrigation pipeline increases and requires a lot of repair work. As part of the repair work for an aging pipeline, pipe rehabilitation has been used. In this method, the inner pipe (rehabilitated pipe) is inserted into the outer aging pipe. Studies on the axial behavior of the rehabilitated pipe are not readily conducted although the influence of the outer aging pipe on the cross-section behavior of the inner pipe is evaluated by model tests, centrifuge tests, and FEM analyses. In this study, shaking table tests are conducted to verify the dynamic behavior along the axial direction of the inner pipe used for the method. To model inner pipes, polyvinyl chloride (PVC) and polyethylene (PE) pipe, which are 3040 mm in length and 140 mm in diameter, are used. To model outer pipes, different types of concrete pipes in length are used. Test results indicate that the amplitude of the bending strain of the PVC pipe with the outer pipe is large shortly after the pipe was moved horizontally due to liquefaction. In addition, the gradient of the bending strain increment to the horizontal displacement increment of the pipe end increases in proportion to the length of the outer pipe.

Abstract: The invention discloses a preparation process for a heat-resistant modified PVC (polyvinyl chloride) plastic pipe. The preparation process comprises the following steps: 1) mixing: taking 55 to 60 parts of PVC resin, 2 to 5 parts of stabilizer, 1 to 3 parts of lubricant, 20 to 30 parts of methyl methacrylate-styrene-butadiene copolymer, 25 to 35 parts of styrene-acrylonitrile-methyl methacrylate copolymer, 5 to 10 parts of filling agent and 4 to 8 parts of heat-resistant modifier according to parts by weight, and putting all the raw materials into a high speed mixing machine and mixing to obtain a mixture; 2) performing extrusion molding by an extruder; 3) shaping and cooling; 4) cutting at a fixed length. With the adoption of the manner, the process disclosed by the invention is simple and easy to control; the prepared PVC pipe has excellent strength, impact resistance and heat resistance and can be used in high-temperature liquid stably for a long time.

Abstract: The invention discloses a method for preventing a corrugated pipe from being damaged in a filled layer. The method includes the following steps that (1) a groove for burying the corrugated pipe is excavated; (2) a polyvinyl chloride (PVC) pipe longer than the corrugated pipe is selected and inserted into the corrugated pipe, one end of the PVC pipe is connected with a bolt U-shaped pipe, the other end of the PVC pipe is sealed by tightening a bolt stopper, and a water filling level mark is engraved to the end, far from the PVC pipe, of the bolt U-shaped pipe; (3) water is injected into the PVC pipe through one end of the bolt U-shaped pipe till the water level reaches the water filling level mark; and (4) after a filler is compacted and meets the requirement, the bolt stopper is unscrewed, water in the PVC pipe is completely discharged, the PVC pipe is removed, and the construction of next corrugated pipe is performed. The PVC pipe is adopted as a protective pipe for construction of the corrugated pipe; water is injected, and the filler is compacted through water pressure; therefore, the damage to the corrugated pipe is greatly reduced, and manpower and mechanical consumption is reduced; the construction quality of the corrugated pipe is improved, the work efficiency is guaranteed, and the construction period is further shortened.

Abstract: The utility model discloses a novel rubber and plastic PVC pipe, including the rubber and plastic inner tube, rubber and plastic inner tube skin is provided with the anticorrosive coating, anticorrosive coating outside coating aluminium foil protective layer, rubber and plastic inner tube inlayer is provided with glass magnesium board substrate layer, the inboard PVC substrate layer that is of glass magnesium board substrate layer, the intraductal circumference of PVC substrate layer internal orifice has the boss The utility model discloses a rubber and plastic PVC pipe has fine heat preservation effect, exposes simultaneously to have a fine anti -aging anti -corrosion function outdoor, and environmental protection and energy saving are worth promoting

Abstract: The invention discloses a graphene PVC drainage pipe and a preparation method thereof. The high-strength abrasion-resisting graphene PVC drainage pipe is prepared from rigid polyvinyl chloride 75%-80%, an additive 20%-15%, calcium carbonate 3%-5% and graphene 0.5%-1%. The preparation process is that a coupling agent is added after mixture to obtain a modified mixture B, and finally the modified mixture B is subjected to quantitative charge, melt extrusion, mould forming, cooling and shape fixation, traction, logo spray printing and fixed-length cutting to obtain the graphene PVC drainage pipe. The original strength, abrasion resistance, temperature resistance, cold resistance, anti-corrosive properties and antistatic properties of the graphene PVC drainage pipe are greatly improved, the shortcomings of low strength and easy breakage or cracking of the PVC pipe at the low temperature are overcome, the abrasion rate of a pipeline is reduced, adhered sediment caused by static electricity on the inner wall of the pipeline is avoided, the possibility of pipeline blockage is prevented, the service life of the pipeline is greatly prolonged, and the graphene PVC drainage pipe is the innovative revolution for the pipeline industry.

Abstract: The utility model discloses a two hardness water conservancy diversion water pipes belongs to pipe technical field. Including the PVC pipe, the PVC inside pipe wall is equipped with two just fuisw ribs to setting up along the axial, and this fuisw rib is established on the inner wall of this PVC pipe with being the spiral, and the pitch of this spiral is the twice of PVC internal diameter of pipe, PVC outside of tubes cover has a pu pipe of being in the same place with the hot pressing of PVC pipe, and the surface hot pressing of pu outside of tubes has the pattern of expression orientation. The utility model discloses set up the fuisw rib at pipe inner wall, simple structure, it has certain impact force to play water conservancy diversion effect and make water between rivers and the pipe inner wall, and debris are difficult for the adhesion on the pipe wall, guarantee the noncongestion of water pipe, inlayer PVC pipe hardness is higher, and the cutting is convenient, and the comparatively soft inlayer PVC pipe of protecting of pu pipe does not receive outside great impact, and the pu pipe is thermal -insulated effectual, can prevent to be scalded because of carelessness.

Abstract: The present invention relates to a molded pipe cooling device for a manufacturing system of a lead-free PVC pipe having a triple structure. According to the present invention, generation of defects in a molded pipe molded at a high temperature are reduced by: hardening a short length front end of a molded pipe which has a triple structure and is softened by being injection molded at a high temperature from an extrusion die device by primarily cooling the same under vacuum with a vacuum cooling means; and hardening the resulting molded pipe by cooling the same with a water cooling means integrally formed with the vacuum cooling means. Thus, manufacturing output and quality of the molded pipe are increased by minimizing defective parts or, in other words, a cut region in the molded pipe after being molded.

Abstract: The invention provides an environment-friendly plastic inspection well and relates to the field of inspection wells. The inspection well comprises a well seat, a shaft and a closing-up well ring. The upper end of the well seat is connected with the shaft, and the upper end of the shaft is connected with the closing-up well ring. The inspection well is characterized in that reinforcing ribs are arranged on the closing-up well ring, annular reinforcing ring are arranged on the wall of the shaft and the wall of the well seat, the shaft is composed of a hollow wall PVC pipe, an HDPE double-wall corrugated pipe, an HDPE winding pipe and an adjustable shaft, the well seat is subjected to one-time injection molding or pouring forming or rotational molding, and pipe diameter and angle changed connections are achieved through accessories such as reducing joints and sealing rings. The ring stiffness and bearing strength of the closing-up well ring are improved, and the service life of the inspection well is prolonged.

Abstract: The invention provides a reinforced plastic inspection well and relates to the field of inspection wells. The reinforced plastic inspection well comprises a well seat, a wellbore and a closing well ring. The upper end of the well seat is connected with the wellbore, and the upper end of the wellbore is connected with the closing well ring. The reinforced plastic inspection well is characterized in that reinforcing ribs are arranged on the closing well ring, and the wall of the wellbore and the wall of the well seat are both provided with annular reinforcing rings; the wellbore is composed of a hollow-wall PVC pipe, a double-wall HDPE corrugated pipe, an HDPE winding pipe and an adjustable wellbore body; the well seat is formed through one-time injection molding, or pouring molding or rotational molding; connection with variable pipe diameters and angles is realized through reducing joints, sealing rings and other accessories. According to the reinforced plastic inspection well, the circular rigidity and the bearing strength of the closing well ring are improved, and the service life of the inspection well is prolonged.

Abstract: The invention discloses a new technology for plastic finished product application. A waste PVC pipe is treated; the new technology comprises a mold cavity corresponding to the shape of a PVC pipe body, and a hole position mold corresponding to a hole position of the PVC pipe body; the PVC pipe body is molded by injection; and in injection molding, such furniture as chairs and tables is manufactured. The new technology achieves the effects of environmental protection, energy conservation and emission reduction, and is excellent in social benefit.

Abstract: The invention provides a back-infiltrating well water filtering device used for rainwater natural purification, belonging to water purifying equipment According to the back-infiltrating well water filtering device, ceramsite gravel-lined layers with particle sizes gradually reduced are adhered to the outer wall surface of a PVC pipe or a steel pipe in the sequence from inside to outside, a reinforcing steel bar barrel is assembled on the outer parts of the ceramsite gravel-lined layers in a wrapping manner, blocking steel plates are fixedly arranged on the lower end parts of the PVC pipe or the steel pipe, the ceramsite gravel-lined layers and the reinforcing steel bar barrel, an upper cover steel plate with a central through hole is assembled on the upper end parts of the PVC pipe or the steel pipe and the ceramsite gravel-lined layers, a screw thread type sleeve is assembled above the upper cover steel plate, the top ends of reinforcing steel bars of the reinforcing steel bar barrel are bent-hook-shaped, through holes are formed in the wall of the PVC pipe or the steel pipe, and the porosity is 10-30 % The back-infiltrating well water filtering device is novel, reasonable and simple in structure, light in weight, strong in strength, and good in permeability, can resist corrosion, and is low in cost, reliable in work and long in service life, while the infiltration amount of surface water is increased, the water quality is purified, and thus the pollution of the underground water is avoided

Abstract: The invention provides a combined type reinforced plastic inspection well and relates to the field of inspection wells. The combined type reinforced plastic inspection well comprises a well seat, a wellbore and a closing well ring. The upper end of the well seat is connected with the wellbore, and the upper end of the wellbore is connected with the closing well ring. The combined type reinforced plastic inspection well is characterized in that reinforcing ribs are arranged on the closing well ring, and the wall of the wellbore and the wall of the well seat are both provided with annular reinforcing rings; the wellbore is composed of a hollow-wall PVC pipe, a double-wall HDPE corrugated pipe, an HDPE winding pipe and an adjustable wellbore body; the well seat is formed through one-time injection molding, or pouring molding or rotational molding; connection with variable pipe diameters and angles is realized through reducing joints, sealing rings and other accessories. According to the combined type reinforced plastic inspection well, the circular rigidity and the bearing strength of the closing well ring are improved, and the service life of the inspection well is prolonged.

Abstract: The invention relates to a PVC pipe and a preparation method thereof, and especially relates to a PVC-M impact-resistant low-temperature-resistant pipe. The pipe is prepared from the following raw materials in parts by mass: 100 parts of PVC resin, 2-6 parts of chlorinated polyethylene, 2-8 parts of vinyl-vinyl acetate copolymer, 1-3 parts of stearic acid, 1-10 parts of fly ash, 1-8 parts of polyethylene wax, and 1-8 parts of a composite lead salt stabilizing agent. Through improvement on raw material formula and technology, the pipe is improved in flexibility, tensile strength, impact resistance and low-temperature resistance. The method is simple in technology, also realizes reutilization of fly ash waste, and reduces production cost.