Connecting structure and method for HDPE winding structure wall pipe and HDPE double-wall corrugated pipe

Abstract

The invention discloses a connecting structure and method for an HDPE winding structure wall pipe and an HDPE double-wall corrugated pipe, and relates to the technical field of buried plastic drainage pipelines, the connecting structure comprises the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe, the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe are welded together, and the interiors of the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe are communicated; the outer wall of the connecting end of the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe is wrapped with a polyethylene thermal shrinkage belt, and a concrete block is arranged on the outer wall of the connecting end of the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe. According to the connecting method for the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe, the problem of direct connection between the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe is solved, the tensile resistance and the sealing performance of the connecting position meet the national standard, the connecting position is further coated with concrete, the strength of the connecting position is larger than SN8, and the connecting position is not prone to deformation. And the connection strength and the sealing performance between the two are further ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of buried plastic drainage pipes, and specifically to a connection structure and method for an HDPE wound structured wall pipe and an HDPE double-wall corrugated pipe. Background Art

[0002] Both the HDPE wound structured wall pipe and the HDPE double-wall corrugated pipe are pipes made of polyethylene (PE) resin as the main raw material and adding materials to improve the pipe performance. Both are widely used in buried drainage engineering projects, but their pipe structures and connection methods are different. The polyethylene wound structured wall pipe is made of high-density polyethylene resin as the main raw material, using a hot-state winding process, and is processed into a pipe with a smooth inner surface and a spiral "O"-type rib with a polypropylene hollow pipe as an auxiliary support on the outer surface. The pipe is connected by socket electrofusion welding; the polyethylene double-wall corrugated pipe uses high-density polyethylene as the main raw material, and the inner and outer walls are extruded simultaneously to form a lightweight pipe in one step. Its inner wall is smooth and flat, the outer wall is trapezoidal corrugated, and there is a sandwich hollow layer between the inner and outer walls. The pipe is connected by an elastic sealing ring.

[0003] In actual projects, there is a situation where the HDPE wound structured wall pipe and the HDPE double-wall corrugated pipe are used crosswise, and the direct connection between the two pipes is inevitable. However, the current national standards and specifications do not provide a direct connection method between the HDPE wound structured wall pipe and the HDPE double-wall corrugated pipe. Therefore, there is an urgent need for a connection structure and method for the HDPE wound structured wall pipe and the HDPE double-wall corrugated pipe to solve the above problems. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a connection structure and method for an HDPE wound structured wall pipe and an HDPE double-wall corrugated pipe to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A connection structure for an HDPE wound structured wall pipe and an HDPE double-wall corrugated pipe includes: an HDPE wound structured wall pipe and an HDPE double-wall corrugated pipe, the HDPE wound structured wall pipe and the HDPE double-wall corrugated pipe are welded together and internally connected, a polyethylene heat shrinkable tape is wrapped on the outer walls of the connection ends of the HDPE wound structured wall pipe and the HDPE double-wall corrugated pipe, and concrete blocks are provided on the outer walls of the connection ends of the HDPE wound structured wall pipe and the HDPE double-wall corrugated pipe.

[0007] As a further scheme of the present invention: the length of the polyethylene heat shrinkable tape is less than the length of the concrete block, and the polyethylene heat shrinkable tape is located inside the concrete block.

[0008] A connection method for an HDPE wound structural wall pipe and an HDPE double-wall corrugated pipe, including the connection structure of an HDPE wound structural wall pipe and an HDPE double-wall corrugated pipe as described above, further comprising the following steps:

[0009] S1. According to the pipe diameters of the HDPE wound structural wall pipe and the HDPE double-wall corrugated pipe, remove 1 to 3 turns of the outer "O"-shaped ribs at the end of the HDPE wound structural wall pipe, and remove 1 to 3 turns of the trapezoidal corrugations at the end of the HDPE double-wall corrugated pipe, so that the wall thicknesses of the connecting parts of the HDPE wound structural wall pipe and the HDPE double-wall corrugated pipe are basically the same, and polish the ends of both to be smooth without burrs, clean both sides of the connecting part to ensure it is clean without foreign objects;

[0010] S2: Align the inner pipe orifices at the connecting ends of the HDPE wound structural wall pipe and the HDPE double-wall corrugated pipe, and leave a gap of 1 to 2 mm between the two ports; use a hot melt welding gun and HDPE welding wire to weld the inner pipes of the two ports together to ensure full penetration welding of the weld;

[0011] S3: Adopt a 2.5-mm-thick polyethylene heat shrinkable tape, wind it around the welds on both sides within a range of 150 mm around the connecting part of the HDPE wound structural wall pipe and the HDPE double-wall corrugated pipe for 4 turns, with the starting and ending lap widths not less than 80 mm, the lap seams staggered and parallel to each other, and the polyethylene heat shrinkable tape without wrinkles;

[0012] S4: Slowly heat the polyethylene heat shrinkable tape with a flame, so that the polyethylene heat shrinkable tape shrinks when heated. During the shrinking process, check the fluidity of the glue by the finger pressure method, and the finger pressure marks should disappear automatically. After the temperature at the pipe connection naturally drops to the ambient temperature, conduct a water tightness test;

[0013] S5: After the water tightness test is qualified, pour concrete blocks within a range of 200 mm around the connecting part of the HDPE wound structural wall pipe and the HDPE double-wall corrugated pipe with C30 fine aggregate concrete, and ensure that the strength of the connecting part is greater than or equal to SN8.

[0014] As a further scheme of the present invention: In step S1, the cleaning length of the connecting part of the HDPE wound structural wall pipe and the HDPE double-wall corrugated pipe is within the range of 150 to 200 mm.

[0015] As a further scheme of the present invention: In step S2, the ambient temperature during welding is not lower than 0 °C, the air humidity does not exceed 70%, and the diameter of the HDPE welding wire is 4 mm.

[0016] As a further scheme of the present invention: In step S4, during the heating process, avoid long-term baking of any point on the polyethylene heat shrinkable tape.

[0017] As a further solution of the present invention: in step S5, the distance between the outer wall of the concrete block and the outer wall of the connection part is greater than or equal to 150 mm.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The present invention provides a connection method for an HDPE winding structured wall pipe and an HDPE double-wall corrugated pipe, which solves the problem of direct connection between the HDPE winding structured wall pipe and the HDPE double-wall corrugated pipe, and the tensile strength and sealing performance at the connection part both meet the national standards. Concrete coating is also adopted at the connection, and its strength is greater than SN8, which further ensures the connection strength and sealing performance between the two. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a connection structure between an HDPE winding structured wall pipe and an HDPE double-wall corrugated pipe in an embodiment of the present invention.

[0021] In the figure: 1. HDPE winding structured wall pipe; 2. HDPE double-wall corrugated pipe; 3. Polyethylene heat-shrinkable tape; 4. Concrete block. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the embodiment of the present invention, please refer to Figure 1 , a connection structure between an HDPE winding structured wall pipe and an HDPE double-wall corrugated pipe, includes: an HDPE winding structured wall pipe 1 and an HDPE double-wall corrugated pipe 2. The HDPE winding structured wall pipe 1 and the HDPE double-wall corrugated pipe 2 are welded together and internally connected. A polyethylene heat-shrinkable tape 3 is wrapped on the outer walls of the connection ends of the HDPE winding structured wall pipe 1 and the HDPE double-wall corrugated pipe 2, and a concrete block 4 is provided on the outer walls of the connection ends of the HDPE winding structured wall pipe 1 and the HDPE double-wall corrugated pipe 2.

[0024] The pipe ends of the HDPE winding structured wall pipe 1 and the HDPE double-wall corrugated pipe 2 are welded together. The polyethylene heat-shrinkable tape 3 is wound and wrapped on the outer wall of the connection part, and then the concrete block 4 is poured to further ensure the sealing effect between the two pipes.

[0025] As an embodiment of the present invention, the length of the polyethylene heat-shrinkable tape 3 is less than the length of the concrete block 4, and the polyethylene heat-shrinkable tape 3 is located inside the concrete block 4.

[0026] A connection method for an HDPE wound structured wall pipe and an HDPE double-wall corrugated pipe, including the connection structure of the above-mentioned HDPE wound structured wall pipe and HDPE double-wall corrugated pipe, further includes the following steps:

[0027] S1. According to the pipe diameters of the HDPE wound structured wall pipe 1 and the HDPE double-wall corrugated pipe 2, remove 1 to 3 turns of the outer "O"-type ribs at the end of the HDPE wound structured wall pipe 1, and remove 1 to 3 turns of the trapezoidal corrugations at the end of the HDPE double-wall corrugated pipe 2, so that the wall thicknesses of the connecting parts of the HDPE wound structured wall pipe 1 and the HDPE double-wall corrugated pipe 2 are basically the same, and polish the ends of both to be smooth without burrs, clean both sides of the connecting part to ensure it is clean and free of foreign objects;

[0028] S2: Align the inner pipe nozzles at the connecting ends of the HDPE wound structured wall pipe 1 and the HDPE double-wall corrugated pipe 2, and leave a gap of 1 to 2 mm between the two ports; use a hot melt welding gun and HDPE welding wire to weld the inner pipes of the two ports together to ensure full penetration welding of the weld; the tensile resistance at the connection of the HDPE wound structured wall pipe 1 and the HDPE double-wall corrugated pipe 2 meets the requirements of "Polyethylene (PE) structured wall pipe systems for buried use - Part 2: Polyethylene wound structured wall pipes" GB / T 19472.2 - 2017;

[0029] S3: Adopt a polyethylene heat shrinkable tape 3 with a thickness of 2.5 mm, and wind it around the welds on both sides within a range of 150 mm around the connection part of the HDPE wound structured wall pipe 1 and the HDPE double-wall corrugated pipe 2 for 4 turns, with the starting and ending overlap widths not less than 80 mm, the overlap seams staggered and parallel to each other, and the polyethylene heat shrinkable tape 3 without wrinkles;

[0030] S4: Slowly heat the polyethylene heat shrinkable tape 3 with a flame, so that the polyethylene heat shrinkable tape 3 shrinks when heated. During the shrinking process, check the fluidity of the glue by the finger pressure method, and the finger pressure marks should disappear automatically. After the temperature at the pipe connection naturally drops to the ambient temperature, conduct a water tightness test on the pipe connection in accordance with "Code for construction and acceptance of water supply and drainage pipelines" GB50268 - 2008;

[0031] S5: After the water tightness test is qualified, pour concrete blocks 4 with C30 fine aggregate concrete within a range of 200 mm around the connection part of the HDPE wound structured wall pipe 1 and the HDPE double-wall corrugated pipe 2, and ensure that the strength of the connection part is greater than or equal to SN8.

[0032] As an embodiment of the present invention, in step S1, the cleaning length of the connection part of the HDPE wound structured wall pipe 1 and the HDPE double-wall corrugated pipe 2 is 150 - 200 mm.

[0033] As an embodiment of the present invention, in step S2, during welding, the ambient temperature is not lower than 0°C, the air humidity does not exceed 70%, and the diameter of the HDPE welding wire is 4 mm.

[0034] As an embodiment of the present invention, in step S4, during the heating process, avoid long-term baking of any point on the polyethylene heat-shrinkable tape 3.

[0035] As an embodiment of the present invention, in step S5, the distance between the outer wall of the concrete block 4 and the outer wall of the connection part is greater than or equal to 150 mm.

[0036] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0037] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A connection structure of a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe, characterized in that: include: HDPE wrapped structural wall pipe and HDPE double-wall corrugated pipe, the HDPE wrapped structural wall pipe and HDPE double-wall corrugated pipe are welded together and internally connected, the outer wall of the connecting end of the HDPE wrapped structural wall pipe and HDPE double-wall corrugated pipe is wrapped with polyethylene heat shrink tape, and the outer wall of the connecting end of the HDPE wrapped structural wall pipe and HDPE double-wall corrugated pipe is provided with a concrete block.

2. The connection structure of a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe according to claim 1 is characterized in that: The polyethylene heat shrinkable tape is shorter than the concrete block and is located inside the concrete block.

3. A method for connecting a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe, comprising a connecting structure of a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe as claimed in any one of claims 1 to 2, characterized in that: The following steps are also included: S1. According to the pipe diameters of the HDPE spiral wall pipe and the HDPE double-wall corrugated pipe, remove 1 to 3 turns of the outer "O"-shaped ribs at the end of the HDPE spiral wall pipe, and remove 1 to 3 turns of the trapezoidal corrugations at the end of the HDPE double-wall corrugated pipe, so that the pipe wall thickness of the connection part of the HDPE spiral wall pipe and the HDPE double-wall corrugated pipe is basically the same, and grind the ends of the two to be smooth without burrs, clean both sides of the connection part of the two to ensure that it is clean and free of foreign matter; S2: Align the inner pipe openings of the HDPE wrapped structural wall pipe and the HDPE double-wall corrugated pipe at the connection ends, leaving a gap of 1 to 2 mm between the two ends; use a hot melt welding gun and HDPE welding wire to weld the inner pipes of the two ends together to ensure full penetration of the weld; S3: Use 2.5mm thick polyethylene heat shrink tape to wrap 4 circles within 150mm on both sides of the weld at the connection between the HDPE wrapped structural wall pipe and the HDPE double-wall corrugated pipe. The overlap width from beginning to end shall not be less than 80mm. The overlap seams shall be staggered and parallel to each other, and the polyethylene heat shrink tape shall be wrinkle-free. S4: Use flame to slowly heat the polyethylene heat shrink tape, so that the polyethylene heat shrink tape shrinks due to heat. During the shrinking process, use finger pressure method to check the fluidity of the glue. The finger pressure mark should disappear automatically. After the temperature of the pipe connection naturally drops to the ambient temperature, conduct the water-tightness test; S5: After the water-tightness test is passed, C30 fine stone concrete is used to cast concrete blocks within 200mm around the connection between the HDPE wrapped structural wall pipe and the HDPE double-wall corrugated pipe, and the strength of the connection is guaranteed to be greater than or equal to SN8.

4. The method for connecting a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe according to claim 3, characterized in that: In step S1, the cleaning length of the connection between the HDPE winding structure wall pipe and the HDPE double-wall corrugated pipe is within the range of 150 to 200 mm.

5. The method for connecting a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe according to claim 3, characterized in that: In step S2, during welding, the ambient temperature is not lower than 0°C, the air humidity is not higher than 70%, and the diameter of the HDPE welding wire is 4 mm.

6. The method for connecting a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe according to claim 3, characterized in that: In step S4, during the heating process, it is avoided to bake any point on the polyethylene heat shrinkable tape for a long time.

7. The method for connecting a HDPE winding structure wall pipe and a HDPE double-wall corrugated pipe according to claim 3, characterized in that: In step S5, the distance between the outer wall of the concrete block and the outer wall of the connection part is greater than or equal to 150 mm.

Images