KR20020095714A - Tube and molding system the same - Google Patents

Abstract

PURPOSE: A tube and a tube forming device are provided to easily manufacture both a small tube and a large tube by directly injecting a material to a mold before the chemical reaction of the material and to improve the durability against vibration and load by integrally forming a coated layer onto the inner face of the tubes. CONSTITUTION: A tube forming device comprises a material supply device and a molding device. The material supply device comprises guide rails(2) installed parallel to each other, a truck(4) moving along the guide rails, and a material supply unit(6) installed at an upper portion of the truck. The molding device comprises a molder(8) forming a tube, a rotating unit(10) supporting and rotating the molder in one direction, and a drive unit(12) driving the rotating unit. Onto the inner face of a tubular body, a coated layer is formed at an even thickness.

Description

TUBE AND MOLDING SYSTEM THE SAME

The present invention relates to a tube forming apparatus, and more particularly, by forming a tube by directly spraying the inside of the molder before the mixed raw materials are chemically reacted, it is possible to easily produce a large tube of large diameter as well as a small tube. In particular, the coating layer is integrally formed on the inner circumferential surface of the tube to be molded, and also relates to a tube forming apparatus capable of further improving durability against vibration and load by distributing a polymer in the tube.

Generally, piping is carried out by embedding water and sewage pipes, drain pipes, and the like to a certain depth from the ground surface.

These tubes are molded by a frame member of a certain shape, that is, a mold, and aggregates such as sand are mainly used as materials, and the durability of the pipes is required to withstand loads and vibrations.

Therefore, in order to exhibit more improved durability at the time of manufacturing the pipes by forming a diameter of one or more coating layers on the inner circumferential surface and the outer circumferential surface of the tubular body made of a constant diameter to ensure more improved durability, The coating layer is mainly a polymer.

However, the conventional tubes are formed to form a coating layer (polymer) on the inner and outer circumferential surfaces of the tube after forming the tube by a separate working process, the curing time is short due to the characteristics of the coating material, such as a large diameter There are many problems in the production of large tubes having a.

In addition, the coating layer is formed on the outer circumferential surface or the inner circumferential surface of the tube by a separate working process, the binding force between the tube and the coating layer is reduced in structure, so that the coating layer does not have a great influence on the durability improvement. In case of laying pipe, it is easily ruptured by earth pressure caused by repetitive load and vibration or natural ground subsidence due to the operation of the vehicle. The watertightness in the pipeline due to breakage is lowered, causing fluid loss and becoming the main culprit of environmental pollution.

Therefore, the present invention has been proposed to solve the above problems, an object of the present invention can easily manufacture small pipes and large pipes with improved durability and watertightness, etc., greatly reducing the work process and time accordingly An object of the present invention is to provide a tube forming apparatus capable of significantly increasing workability and productivity.

Still another object of the present invention is to provide a tube having durability that can maintain continuous watertightness despite repeated vibration and load.

In order to achieve the object of the present invention as described above,

It consists of a raw material supply device and a molding device for forming a tube by receiving the raw material from the raw material supply device, the raw material supply device, a guide rail which is installed in parallel with a predetermined interval spaced, the trolley moving along the guide rail And a raw material supply unit provided on an upper side of the bogie, wherein the molding apparatus includes a molding machine for forming a tube, a rotating part for supporting the molder and rotating in one direction, and a driving part for driving the rotating part. It provides a molding apparatus for a tube containing.

The present invention also provides a tube in which a polymer coating layer is formed on an inner circumferential surface and a polymer binds aggregate to the tube body.

1 is a perspective view of the tube forming apparatus according to the present invention.

2 is a partial side cross-sectional view of FIG.

Figure 3 is a perspective view of the raw material discharge means according to the present invention.

4 is a partial side cross-sectional view of FIG.

5 is a front view of a molding apparatus according to the present invention.

Figure 6a is a view showing a state of forming a tube by the raw material discharge means according to the present invention.

6B is a view showing a state in which a tube is formed by FIG. 6A.

7a is a perspective view of a tube according to the invention;

FIG. 7B is a sectional view of FIG. 7A; FIG.

8 is an exploded perspective view of a reinforcing structure according to another embodiment of FIG. 7A.

9 is a perspective view of the clip of FIG. 8;

10A is a front view of the coupled state of FIG. 8;

10B is a state diagram used in FIG. 10A.

11 is a cross-sectional view showing another embodiment of a tube according to the present invention.

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

1 and 2 are a perspective view and a partial side cross-sectional view of the tube forming apparatus according to the present invention, referring to the drawings,

Tube forming apparatus is composed of a raw material supply device and a molding device for molding the tube by receiving the raw material from the raw material supply device, the raw material supply device, the guide rail (2) which is installed in parallel and spaced at regular intervals and , A trolley 4 moving along the guide rail 2, and a raw material supply unit 6 provided on an upper side of the trolley 4, wherein the molding apparatus includes a molder 8 for forming a tube. And a rotating part 10 for supporting the molder 8 and rotating in one direction, and a driving part 12 for driving the rotating part 10.

The raw material supply device is for supplying the raw material for forming the tube to the molding device, each component will be described as follows.

The guide rails 2 are installed to be parallel to the bottom surface at regular intervals to move the trolley 4 in a straight line, and a metal material may be used as the material.

The trolley 4 is moved along the guide rail 2 by the driving of the first driving motor 14 so that the discharge means described later moves from one end of the molding machine 8 to the other end of the molding apparatus. By allowing the raw material to be supplied, ordinary fluorescence is combined in a rectangular shape by welding or a similar method.

Under the trolley 4, drive wheels 16 corresponding to the guide rails 2 are installed, and the drive wheels 16 are divided into front wheels and rear wheels and are connected by connecting shafts 18, respectively.

A driven sprocket 20 is installed on the rear wheel connecting shaft 18 of the driving wheel 16, and the driven sprocket 20 is installed on the drive shaft of the first driving motor 14 installed on one side of the trolley 4. It is connected by a drive sprocket 22 and a chain 24 so that the cart 4 can move along the guide rail 2 by the driving of the first drive motor 14.

In addition, a polymer storage case 26 and a hardener storage case 28 are respectively installed on the upper side of the trolley 4, and supply lines 26a and 28a of the polymer storage case 26 and the hardener storage case 28 are respectively provided. Pumping devices (P1, P2) and the air generating device (A) to operate in conjunction with the) is installed, the control unit (C) for electrically controlling each device is installed.

The raw material supply part 6 is provided by the auxiliary frame 30 in the longitudinal direction of the said trolley | bogie 4, The raw material supply part 6 is the hopper 32 which receives aggregate, and the lower side of this hopper 32. And a screw feeder 36 configured to transfer aggregate supplied in one direction to the supply pipe 34 installed at the inner side of the transfer pipe 34, and the discharge end of the transfer pipe 34 is transported. Means are provided for discharging the aggregate to be mixed with the polymer and the hardener.

The hopper 32 maintains a constant taper and has a structure of a conventional hopper having an upper side opened. The material may be a metal material.

The transfer pipe 34 may be a conventional metal pipe having an inner diameter corresponding to the outer circumference of the thread of the screw feeder 36 may be used.

The screw feeder 36 has a conventional structure in which threads are formed by a predetermined lead angle and pitch on the outer circumference of the rotating shaft, and a driven sprocket 38 is installed at one end thereof, and the driven sprocket 38 is the bogie 4. The inner side of the transfer pipe 34 by the drive sprocket 42 and the chain 44 installed on the drive shaft of the second drive motor 40 is installed on one side of the drive by the drive of the second drive motor 40 Rotate in one direction at.

The discharge side of the transfer pipe 34 is provided with a means for discharging the raw material into the molding machine 8 of the molding apparatus, referring to Figures 3 and 4, this means, the discharge side of the transfer pipe 34 A discharge pipe 46 coupled to the distal end, a first impeller 48 coupled to the distal end of the screw feeder 36 inside the discharge pipe 46, and a first horizontally disposed with the first impeller 48. 2 impeller 50 is included.

The discharge pipe 46 is to allow the raw material supplied by the screw feeder 36 of the transfer pipe 34 to be smoothly discharged by the first impeller 48 and the second impeller 50, the inner side A certain space portion is formed in the outer peripheral surface side is formed with a discharge port 52 for discharging the raw material.

The discharge pipe 46 is made of a structure in which one side is cut and folded by the hinge portion (H) can be easily opened and closed inside, so maintenance is very easy.

The discharge port 52 formed in the discharge pipe 46 has one side of the outer circumferential surface of the discharge pipe 46 corresponding to the second impeller 50 so that the raw material can be smoothly discharged by the rotation operation of the second impeller 50. Is formed in a rectangular shape, in addition to the shape of the outlet 52 that can be implemented in addition to the object of the present invention can be applied in various ways.

The first impeller 48 is primarily for mixing the raw material supplied by the screw feeder 36 installed inside the transfer pipe 34 and supplying the second impeller 50 to form a plate. Three blades are formed to be inclined at a predetermined angle while maintaining equal intervals on the outer circumferential surface of the shaft is detachably coupled to the front end of the screw feeder 36 by a separate fastening member.

The second impeller 50 is for remixing the raw materials mixed by the first impeller 48 to be discharged to the outside through the discharge port 52 of the discharge pipe 46, the discharge pipe 46 It is installed horizontally spaced apart from the first impeller 48 at regular intervals from the inside and is rotated in one direction by the driving of the hydraulic motor 54 coupled to the distal end of the discharge pipe 46.

The second impeller 50 has the same structure as the first impeller 48, that is, is formed to be inclined at a predetermined angle while maintaining a constant equal interval on the outer circumferential surface of the shaft, at least one row is formed to be spaced apart at regular intervals horizontally.

The first impeller 48 and the second impeller 50 are not limited to the structure according to the above embodiment, and in addition to the above structure, the shape and arrangement of the blade, which can further satisfy the object of the present invention, are all It is possible to carry out by applying, and described as driving the second impeller by installing a hydraulic motor on one side end of the discharge pipe may be used in addition to the electric motor.

Meanwhile, supply lines 26a and 28a for supplying a curing agent and a polymer are installed at one side of the transfer pipe 34 and the discharge pipe, and the supply lines 26a and 28a are installed at one upper side of the trolley 4. The mixed pump P3 is connected to the polymer storage case 26 and the hardener storage case 28 to supply a predetermined amount of the polymer and the hardener by the pumping devices P1 and P2 and is installed at the discharge side of the transfer pipe 34. By mixing by being supplied to the inside of the discharge pipe 46 and the transfer pipe (34).

And, an air nozzle box (N) is installed on one side of the mixing pump (P3), the nozzle box (N) is connected to the discharge lines of the mixing pump (P3) is installed on one side of the cart (4) The air is supplied from the air generator (A) and discharged in the form of spraying the polymer and hardener mixed and discharged by the mixing pump (P3) to the transfer pipe 34 and the discharge pipe 46 to mix more smoothly. In addition, by cleaning the discharge pipe in addition to the ejection of the discharge pipe 46 and the inside of the transfer pipe 34 by spraying the air to easily remove the foreign matters attached to the inside, it will be easier to maintain.

And, the raw material that can easily realize the embodiment, that is, the aggregate may be mainly used as a powder and sand, the polymer is supplied at a constant ratio with the aggregate and the curing agent at the time of forming the tube, In order to further improve the watertightness and the like, in the above-described embodiment, a polymer produced and sold by Aekyung Chemical Co., Ltd. and having a brand name "POLY COAT" is used as an example. The polymer which can easily realize the object of the invention can be implemented by various applications.

And, the curing agent may be applied to any of the hardening agent as long as it is made of a component that can directly satisfy the durability of the pipe required by directly affecting the binding force of the raw material.

On the other hand, the molding apparatus is for molding a tube having a predetermined shape by receiving the raw material discharged by the discharge means of the raw material supply device, with reference to Figures 1 and 5 will be described in detail the structure of the molding device Is as follows.

The molding apparatus includes a molder 8 for forming a tube, a rotating part 10 for supporting the molder 8 and rotating in one direction, and a driving part 12 for driving the rotating part 10. The bottom surface is provided with a support frame 56 for supporting them.

The support frame 56 is installed on the bottom surface and serves as a kind of support for supporting the molder 8, the rotating part 10, and the driving part 12. As a material, a conventional shape steel may be used.

The molder 8 has an inner diameter portion 58 defining an outer circumferential surface of the tube to be formed and has a cylindrical shape, and circular ground wheels 60 are detachably coupled to both end portions thereof, and the inner diameter portion ( 58) Maintain a constant equal interval at the center of the incision is made of a structure that maintains a cylindrical shape by cutting at least two or more bisecting bolts.

The structure of the molder 8 is a preferred structure that can be easily separated from the inner diameter portion 58 of the molder 8 after the curing of the tube is completed, after a certain curing period.

The rotary part 10 is for rotating the molder 8 in a supported state, and includes a pair of rotary shafts 62 supported by the bearing B on the upper side of the support frame 56, and the rotary shaft ( Consists of guide wheels 64 are coupled to both ends of the 62, respectively, and are spaced apart at intervals to stably support and rotate the molder 8.

A driven pulley 66 is installed on the rotation shaft 62, and the driven pulley 66 is a driving part installed on an upper side of the support frame 56, that is, a driving pulley 68 coupled to the gear box G. It is connected by the belt 70, and is rotated by the driving of the third drive motor 72 coupled to the upper side of the gear box (G).

The gear box G serves as a reducer for appropriately decelerating the rotational speed of the third drive motor 72, and is not necessarily required in the configuration of the present embodiment, and the third drive motor 72 is used. It is also possible to directly connect the drive pulley 68 to the drive shaft of.

The first drive motor 14, the second drive motor 40, the pumping devices P1 and P2, the mixing pump P3, the hydraulic motor 54, and the air generator A of the raw material supply device. And the third drive motor 72 of the molding apparatus is preferably to be automatically controlled by the setting of the control unit (C) installed on one side of the trolley (4), which is easy for those of ordinary skill in the art The detailed description will be omitted as it can be performed.

Accordingly, a preferred embodiment for forming a tube by using the tube forming apparatus according to the present invention made as described above with reference to Figures 1 and 2, 3 as follows.

When aggregate is supplied to the hopper 32 of the raw material supply device, the bogie 4 moves along the guide rail 2 in one direction by driving the first driving motor 14 so as to be in a standby state for forming a tube. Moving to the discharge means provided at one end of the transfer pipe 34, that is, the discharge pipe 46 is positioned at one end of the molding machine 8 of the molding apparatus.

As described above, when the standby state is completed, the molding unit 8 of the molding apparatus is driven so that the rotating unit 10 can be rotated. The driving of the rotating unit 10 operates the control unit C to support the support frame ( By driving the third drive motor 72 installed on the upper side of the 56, the drive pulley 68 of the gear box connected to this motor and the driven pulley 66 of the rotating shaft 62 connected by the belt 70 rotates. The guide wheel 64 is rotated.

Then, the ground wheel 60 of the molder 8 is rotated in one direction in a state of being grounded with the outer circumferential surface of the guide wheel 64, wherein the rotation speed of the molder 8 is preferably maintained at 400 RPM or more. .

When the second drive motor 40 is driven so that aggregate can be supplied to the discharge means in the above state, the screw feeder 36 connected by the drive sprocket 42 and the chain 44 coupled to the drive shaft of the motor. The driven sprocket 38 of the rotation) rotates the screw feeder 36 to sequentially supply the aggregate contained in the hopper 32 to the discharge means.

Then, the curing agent and the polymer supplied with the aggregate is moved along the polymer and the curing material supply line (26a, 28a) by the respective pumping device (P1, P2) and mixed by the mixing pump (P3) air nozzle box ( It is supplied to the discharge means in the form of injection by N).

At this time, the raw material supplied to the discharge means is preferably 75 to 90% of the aggregate, 10 to 25% of the polymer, 0.5 to 2% of the curing agent, in addition to the appropriate ratio to satisfy this depending on the durability and water tightness required for the pipe This can be maintained.

Therefore, as shown in FIGS. 6A and 6B, the raw materials supplied to the discharge means are hydraulic motors in the same rotational direction as the first impeller 48 and the first impeller 48 installed on the discharge side of the screw feeder 36. It is mixed with the second impeller 50 which rotates by 54, and is discharged | emitted through the discharge port 52 of the discharge pipe 46. As shown in FIG.

Thus, in the above state, the trolley 4 is moved along the guide rail 2 by the first driving motor 14 so that the discharge means is rotated at a constant speed by the one-pass operation, that is, the rotating part 10 ( The inner diameter portion 58 of 8) discharges the raw material from one end to the other end and moves at a constant speed, whereby a constant diameter is generated by the centrifugal force at the inner diameter 58 of the molder 8 by the raw material discharged in the process. The tubular body T which has is formed.

In addition, a coating layer T1 having a predetermined thickness is formed on an inner circumferential surface of the tube T. When the molder 8 rotates in one direction by a rotating unit to generate centrifugal force, the coating layer T1 is mixed by the discharge means. Among the raw materials sprayed on the inner circumferential surface of the molder 8, in particular, a polymer having a specific gravity smaller than that of the aggregate forms the coating layer T1 on the inner circumferential surface of the tubular body T as shown in the figure by the centrifugal force of the molder 8. (Fig. 6b)

Thus, the tube T is filled with a polymer and a hardener between the aggregate and the aggregate, and the remaining polymer forms the coating layer T1 integrally with the inner circumferential surface of the tube T by centrifugal force, thereby improving durability and watertightness of the tube. Even if a separate coating operation is not performed to improve, the polymer is cured on the inner circumferential surface of the tube body T by the centrifugal force of the molder 8 to form a more robust coating layer (T1) integrally, thereby exhibiting more improved durability.

As described above, when the discharging means moves from one end of the inner diameter portion 58 of the molder 8 to the other end to finish discharging the raw material for forming the pipe, the discharging means of the discharging means is stopped by the controller C. Afterwards, the first driving motor 14 of the trolley 4 is driven to return the trolley 4 to the standby state again.

When the cart 4 returns along the guide rail 2 and is in the standby state by the above process, the mold 8 is moved to a curing state by using a separate transport device to cure the inner circumferential surface of the tubular body T, and Fabrication of the tube according to the present invention in which the coating layers T1 and T2 are integrally formed on the outer circumferential surface is completed. (See FIGS. 7A and 7B).

In addition, another molder may be installed in the rotating unit 10 to form a tube in the same or similar manner as the forming method.

In the above embodiment, while the aggregate, polymer, hardening material is mixed at a constant ratio to form a coating layer on the inner circumferential surface of the tube to be formed to improve durability, while another embodiment of the tube according to the present invention Since the reinforcing structure is integrally molded to the tube of the tube to be formed, it is possible to actively cope with the improvement of the durability of the tube as well as the property of being easily broken by a strong impact, that is, brittleness.

Therefore, with reference to Figure 8 will be described another embodiment of the tube according to the present invention.

First, the reinforcing structure, the cylindrical structure that can be inserted between the inner peripheral surface and the outer peripheral surface of the tube (T), that is formed in a length corresponding to the length of the tube (T) of the tube to be formed and at least four or more in the circumferential direction Horizontal iron core (W1) spaced at equal intervals, and spiral iron core (W2) spirally wound on the outer circumferential surface of the horizontal iron core (W1) and fixed by welding or the like with the horizontal iron core (W1) And a mesh member M wrapped around the outer circumferential surfaces of the horizontal iron core W1 and the spiral iron core W2, and the mesh member M is fixed to the outer circumferential surface of the horizontal iron core W1 and the spiral iron core W2. It includes a clip (S) to be.

The horizontal iron core (W1) and the spiral iron core (W2) may be used a conventional wire, a metal material is preferably used as the material.

The mesh member (M) is made of a shape that can wrap the entire outer peripheral surface of the horizontal iron core (W1) and the spiral iron core (W2), a general polygonal or circular through-hole is formed on the entire surface, the material is PE (POLYETHYLENE), PP (POLYPROPYLENE) and the like can be used.

The clip (S) is to allow the mesh member (M) to be smoothly fixed to the outer peripheral surface of the structure forming a cylindrical skeleton by the horizontal iron core (W1) and the spiral iron core (W2), referring to FIG. And an extension portion 76 having a fixing hole 74 having a shape corresponding to the spiral iron core W2 and extending to a predetermined length, and the extension portion 76 has a cutout 78 formed therein. Inserting one side of the spiral iron core (W2) and the mesh member (M) in the fixing hole 74 can be stably fixed by elasticity.

The material of the clip (S) may be used a synthetic resin material provided with a constant elasticity, in addition to the material satisfying the nature of the present invention can be carried out by applying a variety.

In the above description, the fixing hole 74 of the clip S is inserted into and fixed to the spiral iron core W2, but the present invention is not limited thereto. The horizontal iron core W1 has a shape corresponding to the horizontal iron core W1. It may be fixed to W1).

10A and 10B, the extension length L of the clip S installed at equal intervals on the spiral iron core W2 at the outer circumferential surface of the structure is equal to the diameter of the inner diameter portion 58 of the molder 8. It is preferable to be formed to be the same or larger, which is the preferred structure that the clip (S), that is, the tip portion of the extension portion 76 is grounded to one side of the inner diameter portion 58 of the molder 8 can be stably fixed do.

In addition, the diameter (R) of the structure is preferably formed to a length that can be disposed in the center of the inner diameter and the outer diameter of the tubular body (T) to be molded, which is more preferable to improve the durability and brittleness of the tube to be molded Will be.

Thus, the reinforcing structure to which the clip S is fastened is inserted into and fixed to the inner diameter portion 58 of the molder 8, and then the tube is formed by the same or similar method as the forming method of the tube according to the above embodiment. 11, the reinforcing structure is integrally formed between the inner circumferential surface and the outer circumferential surface of the tubular body T to form a structure that can further improve durability as well as brittleness.

In this way, the present invention by forming the tube by spraying directly into the inside of the molder before the mixed raw material chemical reaction, it is possible to easily produce a large tube of large diameter, as well as a coating layer, especially on the inner peripheral surface of the tube to be formed It is formed integrally there is an effect that can further improve the durability, such as vibration and load.

Claims (12)

It consists of a raw material supply device and a molding device for forming a tube by receiving the raw material from the raw material supply device, the raw material supply device, a guide rail which is installed in parallel with a predetermined interval spaced, the trolley moving along the guide rail And a raw material supply part installed on an upper side of the bogie, wherein the raw material supply part is provided with a means for discharging the aggregate transported from the discharging end of the transfer pipe with a polymer and a curing agent, and the molding apparatus, A molding apparatus for a tube, comprising a molder for forming the tube, a rotating part for supporting the molder and rotating in one direction, and a driving part for driving the rotating part. According to claim 1, wherein the raw material supply unit includes a hopper receiving the aggregate, a transfer pipe provided on the lower side of the hopper, and a screw feeder for transferring the aggregate provided in the inner side of the transfer pipe supplied in one direction Forming apparatus of pipe. According to claim 1, The means for supplying the raw material supply means for discharging the raw material, the discharge pipe coupled to the discharge side front end of the transfer pipe, the first impeller coupled to the front end of the screw feeder inside the discharge pipe; And a second impeller disposed horizontally with the first impeller, wherein the feed material is mixed by the rotation of the first impeller and the second impeller and then discharged to the outlet of the discharge pipe. . The apparatus of claim 1 or 3, wherein the discharge pipe of the discharge means has a structure in which one side thereof is cut in the longitudinal direction and is folded by a hinge part to easily open and close the inside of the discharge pipe. 4. The apparatus for forming a pipe according to claim 1 or 3, wherein the raw material supplied to the discharge means holds 75 to 90% of aggregate, 10 to 25% of polymer, and 0.5 to 2% of a curing agent. The apparatus for forming a pipe according to claim 5, wherein the curing agent and the polymer supplied to the discharge means are supplied in a form sprayed by an air nozzle box. The apparatus of claim 1, wherein the molder has an inner diameter portion defining an outer circumferential surface of the tube to be formed, and has a cylindrical shape, and a circular ground wheel is detachably coupled to both end portions thereof. According to claim 1, The rotating unit includes a pair of rotary shafts supported by the bearing, and guide wheels respectively coupled to both ends of the rotary shafts, the guide wheel can be smoothly supported below the ground wheel of the molder The apparatus for forming a tube, characterized in that spaced apart at intervals to support the molder and rotate in one direction. A tube in which particles are mixed with other aggregates (stone crushed particles) and a polymer to form a tube, and a tube coated with a polymer on the inner circumferential surface of the tube. The method of claim 9, wherein the tube further comprises a reinforcing structure between the inner and outer peripheral surface of the tube to be molded to further improve durability and brittleness, the reinforcement structure is formed in a length corresponding to the length of the tube to be molded At least four horizontal iron cores spaced at equal intervals in the circumferential direction, a spiral iron coil spirally wound on the outer circumferential surface of the horizontal iron cores and fixed by welding or a similar method, and the horizontal iron cores And a mesh member wrapped around the outer circumferential surface of the spiral iron core, and a clip for fixing the mesh member to the outer circumferential surface of the horizontal iron core and the spiral iron core. The method of claim 10, wherein the clip is provided with a fixing hole of a shape corresponding to the horizontal core or spiral iron core and made of an extension extending to a constant length, the extension is formed with a cutout is a horizontal iron core in the fixing hole Or a spiral iron core, characterized in that the tube member is easily inserted and fixed. 11. The method of claim 10, wherein the clip is spaced at regular intervals in the longitudinal direction of the structure, at least two or more in the circumferential direction are installed at equal intervals, the posture of the extension is a constant posture in the inner diameter of the molder The tube is fixed with.