KR102036168B1 - double walled pipe for a sewer pipeline and method of manufacturing the pipe - Google Patents

Abstract

The present invention relates to a double wall pipe for a sewer pipeline and a manufacturing method thereof, the double wall pipe comprising: an inner pipe (2) formed by means of a first extrusion with polyethylene or polypropylene; and a corrugated pipe (6), including an outer wall (3) formed to surround the outer circumferential surface of the inner pipe (2) by a uniform thickness by means of a second extrusion with polyethylene or polypropylene on the outside of the inner pipe (2) that is formed by the first extrusion, a plurality of annular ribs (4), each of which is formed to protrude by a predetermined thickness towards the outside of a radial direction of the inner pipe by partially vacuum-suctioning the outer wall (3) in a radial direction of the inner pipe before the outer wall (3) is hardened on the outside of the inner pipe (2), and at least one reinforcing rib (5), each of which is formed by a predetermined thickness in a longitudinal direction on the outer wall (3) at every gap between the two adjacent annular ribs (4), and which is provided along the circumference of the outer wall (3).

Description

Double walled pipe for a sewer pipeline and method of manufacturing the pipe}

The present invention relates to a double wall pipe for sewage pipes and a method of manufacturing the same. Particularly, the present invention relates to a double wall pipe for sewage pipes and a method of manufacturing the same, in which a reinforcing rib made of polyethylene or polypropylene is formed at regular intervals on the outer circumferential surface of the sewer pipe extruded from polyethylene or polypropylene.

Plastic sewage pipes are widely used to guide rainwater, household sewage, etc. to drains or to discharge purified industrial wastewater into rivers. As such sewage pipes, so-called corrugated pipes, in which acid and bone are repeatedly formed in the longitudinal direction, are widely used. (See Patent Document 1)

Conventional double-walled tube as disclosed in Patent Document 1 has the advantage that the flexibility is good due to the repeated formation of the bone and acid to reduce the volume during storage and transport to the place of installation, but rigidity After being buried underground, there was a problem of partially bending or breaking between the valley and the mountain due to earth pressure or load applied from the ground.

KR 10-2009-0129540 A

Therefore, the present invention is designed to solve the problems of the conventional double wall pipe, sewage reinforced with torsional rigidity and bending rigidity so that the connection is not damaged by the repetitive load acting under earth pressure or ground in the buried state An object of the present invention is to provide a double wall pipe for pipes and a manufacturing apparatus thereof.

In addition, another object of the present invention is to provide a simple double wall tube can easily connect the two double wall tube, the airtightness at the connection portion.

Still another object of the present invention is to provide a manufacturing method capable of continuously manufacturing the double wall tube of the above-described structure.

Double wall pipe for sewage pipe of the present invention for achieving the problem to be solved, the inner pipe formed by primary extrusion of polyethylene or polypropylene; An outer wall formed to surround the outer circumferential surface of the inner tube to a predetermined thickness by secondary extrusion with polyethylene or polypropylene on the outer side of the primary extruded inner tube, each of which causes the outer wall to partially protrude in the radial direction of the inner tube A plurality of annular ribs formed by protruding by vacuum suction from the outer wall to a radially outer side of the inner tube by a predetermined thickness and repeatedly formed at regular intervals along the longitudinal direction of the inner tube, and on an outer wall between two adjacent annular ribs It is characterized in that consisting of; corrugated pipes each having a predetermined thickness along the longitudinal direction and having at least one reinforcing rib provided along the circumference of the outer wall.

The double wall pipe has a plurality of pipes which are arranged in a row to extend adjacent one end portion to be coupled to each other, the expansion pipe portion is inserted into the annular ribs of the front end side of the other double wall pipe, the expansion pipe portion A leakage blocking sealing ring is sandwiched between the annular ribs at the front end side of another double wall pipe to be fitted.

The annular ribs and the reinforcing ribs are formed on the outer circumferential surface of the outer wall by vacuum suction by a pair of molding molds disposed one by one on the upper and lower sides of the outer wall and moving in an endless track shape.

The forming mold is formed by connecting a plurality of forming blocks each having an annular rib groove and a reinforcing rib groove in an endless track shape.

Double wall pipe manufacturing method for sewage pipe according to the present invention,

Extruding polyethylene or polypropylene resin through a primary extrusion die to form an inner tube;

An outer wall extrusion step of extruding the outer wall with polyethylene or polypropylene resin on the outer side of the inner tube while passing the inner tube formed through the primary extrusion die through the secondary extrusion die;

A plurality of annular ribs adjacent to the annular wall are continuously disposed at regular intervals on the outer wall by partially vacuuming the outer wall before the outer wall is cured while passing the outer wall through a set of caterpillar molding molds disposed on the upper and lower sides. And a corrugated pipe rib forming step of forming a plurality of reinforcing ribs at regular intervals in the circumferential direction on the outer wall between the ribs.

Double wall pipe manufacturing method according to the present invention, in the corrugated pipe rib forming step, the diameter corresponding to the outer diameter of the annular rib inside the inner tube of the double wall pipe so that the front end side annular rib of the other double wall pipe can be inserted into the tip of the double wall pipe. It may further comprise the step of forming a connection with a.

The manufacturing method of the present invention is characterized in that the inner tube forming step, the outer wall extrusion step, the corrugated pipe forming step is a series of operations in succession.

The manufacturing method of the present invention further includes the step of connecting a plurality of double walled pipes to each other at the front end, in which case, a sealing ring for leak-tightening is mounted between two continuous annular ribs at one end side of one double walled pipe, and the sealing And inserting the ring-mounted double wall pipe into the front end side connection portion of another adjacent double wall pipe to connect two consecutive double wall pipes.

According to the present invention described above, the work productivity can be improved by performing the extrusion of the inner tube, the extrusion of the outer wall, the shaping of the annular ribs and the reinforcing ribs in a series of continuous operations.

In addition, by forming annular ribs and reinforcing ribs on the outside of the outer wall, the flexural rigidity and torsional rigidity against external force acting on the double wall pipe buried in the ground through earth pressure or the ground are increased, and the sewage pipe is damaged due to the external force, The breakage at the connecting portion to be connected can be prevented.

1 is a perspective view of a double wall pipe for sewage pipe manufactured according to the first embodiment of the present invention.
2 is a partial cross-sectional side view of the double wall pipe for sewage pipe according to the first embodiment of the present invention.
3 is a view showing a state in which two double wall pipes according to the first embodiment of the present invention are connected to each other in the ground to form a sewer pipe.
4 is a cross-sectional view taken along the line 'X-X' of FIG. 3.
5 is a perspective view of a double wall pipe for sewage pipe according to a second embodiment of the present invention.
6 is a partial cross-sectional side view of a double wall pipe for sewage pipe according to a second embodiment of the present invention.
7 is a view showing a state in which two double wall pipes according to the second embodiment of the present invention are connected to each other in the ground to form a sewer pipe.
8 is a schematic diagram of an apparatus for producing a double wall tube according to the manufacturing method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The double wall tube 1 according to the first embodiment of the present invention is made of a unit tube having a constant length L0, as shown in FIGS. 1 and 2.

1 and 2, the double wall pipe (1) for sewage pipes according to the first embodiment of the present invention, the inner pipe (2), and integrally formed with the inner pipe on the outer peripheral surface of the inner pipe (2) It is made of a corrugated pipe 6 is incorporated. Both the inner tube 2 and the outer corrugated tube 6 are continuously molded from an polyethylene or polypropylene using an extruder and an extrusion die.

As shown in FIG. 3 and FIG. 6, the double wall tube 1 of the present invention is manufactured as a unit double wall tube 1 having a constant length L0. Each unit double wall pipe 1 is provided with a connection part connected with the front end of the other unit double wall pipe adjacent to both front-end | tips, respectively. That is, one end is provided with a plug-type connection port 1a, and the other end is provided with a socket-type connection port 1b which is expanded so that the outer diameter of the plug-type connection port 1a of another adjacent double wall pipe 1 is inserted as it is. do. The plurality of double wall pipes 1 thus produced are continuously arranged in a row, and the connection parts 1a and 1b of adjacent front ends are connected to each other to form a connection part A to form a sewer pipe of a constant length.

The corrugated pipe 6 constituting the outside of the double wall pipe 1 is secondary to polyethylene or polypropylene on the outside of the wall of the inner pipe 2 formed by primary extrusion, as shown in FIGS. 1 and 2. A plurality of annular ribs are formed at a predetermined thickness by extrusion and at regular intervals along the longitudinal direction, each of which is formed in an annular shape along the circumferential direction on the outer circumferential surface 3a of the outer wall 3 ( 4) and on the outer surface 3a of the outer wall 3 between two adjacent annular ribs 4, a plurality are formed at regular intervals along the circumferential direction, each extending along the longitudinal direction of the tube. And a plurality of reinforcing ribs 5 protruding at a constant height along the radial direction.

Preferably, a set of reinforcing ribs 5 formed around one outer circumferential surface of the outer wall 3 is formed to be staggered from each other when viewed from the front with another set of reinforcing ribs 5 formed around the adjacent outer circumferential surface. .

The annular ribs 4 and the reinforcing ribs 5 reinforce the rigidity against bending deformation due to the load applied from the ground down to the ground in the state where the double wall pipe 1 is embedded in the ground. The reinforcing ribs 5 are filled with soil between a set of reinforcing ribs 5 arranged in the circumference of one outer wall 3 while the double wall pipe 1 is embedded in the ground. It acts to prevent torsional deformation due to external force applied in the axial direction. Accordingly, separation or breakage is prevented at the connection part A of the sewer pipe embedded in the ground.

On the other hand, the reinforcing ribs 5 are not formed between the pair of annular ribs 4 so that the sealing ring 7 can be fitted to the plug-shaped connecting portion 1a provided at one end of the double wall pipe 1.

As shown in FIG. 3, in the connection portion A in which the two double wall tubes 1 are coupled to each other and connected, the plug-shaped connection portion 1a of one double wall tube 1 on which the sealing ring 7 is fitted is seated. The two double wall pipes 1 are connected to each other by being inserted into the socket type connecting portion 1b of the other double wall pipe 1. The sealing ring 7 seals the gap between the double wall pipes 1 of the connection portion A to block leakage.

On the other hand, the double wall pipe 1 according to the second embodiment of the present invention is shown in Figs.

The double wall tube 1 according to the second embodiment of the present invention consists of an inner tube 2 and a corrugated tube 6 formed integrally with the inner tube on the outer circumferential surface of the inner tube 2 and coalesced, and the corrugated tube 6 ) Is also the same as the corrugated pipe of the first embodiment. The inner tube 2 and the outer corrugated tube 6 are all the same as in the first embodiment in that they are continuously molded from polyethylene or polypropylene using an extruder and an extrusion die.

The double wall tube 1 according to the second embodiment differs from the double wall tube of the first embodiment in the structure of the connecting portion A for connecting with another adjacent double wall tube. The double wall tube 1 according to the second embodiment is provided with connecting portions 1a and 1b at both ends in the longitudinal direction, respectively, and both connecting portions 1a and 1b are similarly made of plug type connecting portions. These connection portions include a plurality of annular ribs 4 formed in an annular shape along the circumferential direction on the outer circumferential surface 3a of the outer wall 3, similarly to the connection portion of the first embodiment, but without the reinforcing ribs of the first embodiment. It differs from the connection part of 1st Example in the point.

As shown in FIG. 7, the double wall pipe 1 according to the second embodiment connects two double wall pipes 1 disposed adjacent to each other using the connection pipe 20 at the connection part A. As shown in FIG.

Each of the annular ribs 4 is formed to protrude to a predetermined thickness along the circumferential direction of the outer wall 3 by partially sucking the outer wall 3 radially outward before the outer wall 3 is cured in a molding die. do. The reinforcing ribs 5 are molded together with the annular ribs 4 in the same mold for forming the annular ribs 4. The reinforcing ribs 5 are formed to protrude with a predetermined thickness along the longitudinal direction on the outer wall 3 between two adjacent annular ribs 4, and a plurality of reinforcing ribs 5 are provided along the circumference of the outer wall 3.

The double wall tube of the present invention described above is manufactured through the following process.

Hereinafter, a method for manufacturing a double wall tube of the present invention will be described with reference to FIG. 8.

<First Extrusion Step (S1 of FIG. 8): Extrusion Step of Inner Tube 2>

In the primary extruder 10, polyethylene or polypropylene resin is melted and extruded into the extrusion die 20. The extrusion die 20 forms an inner tube 2 of a constant diameter by the vacuum pump 22 while passing through a polyethylene or polypropylene resin, and hardens with the cooling water sprayed from the nozzle of the extrusion die 20 to form an inner tube ( 2) is extruded.

<Second extrusion step (S2 of FIG. 8): forming the outer wall 3 of the corrugated pipe 6 on the outer side of the inner tube 2>

The polyethylene or polypropylene resin melted in the second extruder 30 is extruded into the extrusion die 40 through the guide tube 31 on the outer circumferential surface of the inner tube 2 extruded in the first extrusion step and the inner tube 2 The outer wall 3 is extruded to a constant thickness on the outer circumferential surface of the sheet.

<Rib forming step of the corrugated pipe 6 (S3 in Fig. 8): forming the annular rib 4 and the reinforcing rib 5 on the outer wall 3 of the corrugated pipe>

In the second extrusion step (S2), the outer wall 3 extruded outside the inner tube 2 by the second extrusion is wrapped with a forming block () moving at the same speed as the moving speed of the inner tube 2, A circumferential annular rib 4 and a longitudinal reinforcement rib 5 are formed on the outer wall 3 in the shape of a groove formed in the inner wall of the forming block by applying a negative pressure by vacuum inside the forming block. To form.

In the molding molds 50A and 50B, a plurality of molding blocks 51A and 51B are connected in an endless track shape, respectively. The upper forming block 51A and the corresponding lower forming block 51B are joined to each other in the forming work section to form a cavity that completely surrounds the outer diameter of the outer wall 3 therein, and the annular shape is formed on the inner wall of the cavity. Grooves (not shown) for ribs 4 and grooves (not shown) for reinforcing ribs are formed. These grooves are formed with a vacuum suction port through which suction force is applied by a vacuum pump.

Accordingly, the vacuum suction input by the vacuum pump is performed while the upper forming block 51A and the lower forming block 51B corresponding thereto are coupled to each other so as to cover the outer wall 3 half by half in the vacuum forming work section (S3 of FIG. 8). The resin of the outer wall 3 is partially sucked into the annular rib groove and the reinforcing rib groove by acting on the inner outer wall 3 to form an annular rib 4 and the reinforcing rib in the shape of the groove on the outer circumferential surface of the outer wall 3. 5) Molding.

In the vacuum forming step S3, the connecting portions 1a and 1b respectively provided at both ends in the longitudinal direction of the double wall tube form only the annular ribs 4 by the forming blocks corresponding to the respective shapes and structures.

As described above, extrusion of the inner tube 2 and extrusion of the outer wall 3 and molding of the annular ribs 4 and the reinforcing ribs 5 are continuously performed in the extrusion process of the inner tube 2. Work productivity can be increased by performing work.

And the annular rib 4 and the reinforcement rib 5 are formed in the outer side of the outer wall 3, and the bending rigidity with respect to the external force acting in the transverse direction of a double wall pipe | tube, for example, earth pressure or the external force acting through the ground, By supporting the deformation of the bitrim can prevent the breakage of the sewer pipe itself or the connection of the connection (A) due to these external forces.

1: Double wall pipe for sewage pipe of this invention
1a, 1b: connection part 2: inner tube
3: outer tube 4: annular rib
5: reinforcement rib 6: corrugated pipe
10: extruder 20: extrusion die
30: extruder 31: guide tube
40: extrusion die 50A, 50B: molding mold
51A, 51b: forming block A: connection

Claims (8)

delete delete delete delete In the manufacturing method of the double wall pipe for sewage pipes consisting of a corrugated pipe having a reinforcing rib and an annular rib on the outside of the inner pipe,
Extruding the inner tube (2) having a constant outer diameter through a primary extrusion die (20) of polyethylene or polypropylene resin (S1);
The inner tube 2 is continuously passed through the inner tube 2 formed through the primary extrusion die 20, and the secondary extrusion die 4 continuously arranged in a row following the primary extrusion die 20. An outer wall extrusion step (S2) of concentrically extruding the outer wall 3 having a constant thickness with polyethylene or polypropylene resin on the outer wall surface of 2);
Each of which is formed along the circumferential direction on the inner wall surface and is spaced in the longitudinal direction with respect to each other, and a plurality of annular rib forming grooves and a circumferential direction on the outer wall 3 between the two adjacent annular rib forming grooves. A set of crawler-type molding molds 50A, 50B, each of which has a plurality of reinforcing rib forming grooves formed at regular intervals, and is arranged to cover the outer wall surface of the outer wall 3 in half, and the inner tube 2 A plurality of annular shapes which are continuously disposed at regular intervals on the outer wall 3 by applying a negative pressure by vacuum to the outer wall 3 while moving at the same speed as the extrusion speed of A corrugated pipe rib forming step S3 for successively forming a plurality of reinforcing ribs 5 at regular intervals in the circumferential direction on the outer wall 3 between the rib 4 and two annular ribs adjacent thereto; And
The outer diameter of the annular rib 4 so that the front end side annular rib 4 of the other double wall tube can be inserted into the front end in the moving direction of the double wall tube 1 formed through the corrugated pipe rib forming step S3. Forming a connection part 1b by expanding to a diameter corresponding to the
The inner pipe forming step (S1), the outer wall extrusion step (S2), corrugated pipe rib forming step (S3) and the connecting portion forming step, characterized in that to perform a continuous series of operations for the double wall pipe for sewage pipe. delete delete The method of claim 5,
A plurality of double wall pipes (1) are arranged continuously in the longitudinal direction, and for leaking off between two consecutive annular ribs (4) of each tip side connecting portion (1a, 1b) of two adjacent double wall pipes (1). Mounting the sealing ring (7), and connecting the two continuous double wall pipe by inserting the front end side connecting portions (1a, 1b) of the double wall pipe (1) on which the sealing ring (7) is mounted on both ends of the connecting pipe (20) Double wall pipe manufacturing method for sewage pipes, characterized in that it further comprises;

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