KR20220021146A - Coupler for corrugated pipe and corrugated pipe and sectional corrugated pipe using it - Google Patents

Abstract

The present invention relates to a coupler for a corrugated pipe. More specifically, the present invention relates to a coupler for a corrugated pipe, which is able to prevent a fluid inside from being leaked, and connect longitudinal end units of a pair of corrugated pipes placed to face each other. According to the present invention, the coupler for the corrugated pipe comprises: a sealing unit having a spiral-shaped valley formed on an outer circumferential surface in a longitudinal direction, and engaged with a bottom surface of the valley on the longitudinal end units of the corrugated pipe with mountains between the valleys in the longitudinal direction, and having a watertight unit and a band unit engaged with the watertight unit by surrounding the adjacent mountain in a direction toward the center in the extension direction of the valley; a gasket unit having the sealing unit and the longitudinal end unit of the corrugated pipe in contact with both sides by protruding to have a second internal diameter smaller than a first internal diameter so that the sealing unit outside the corrugated pipe can be inserted and accommodated so that the sealing unit can be mounted on the longitudinal end unit of the corrugated pipe and engage two corrugated pipes placed serially by insertion from outside, and having a packing unit making the corrugated pipes to communicate with each other; and an engagement unit displaying a tightening force toward the center of the corrugated pipe by being engaged to surround the outer side of the sealing unit.

Description

Coupler for corrugated pipe and corrugated pipe and sectional corrugated pipe using it

The present invention relates to a corrugated steel pipe joint device and a prefabricated corrugated steel pipe using a corrugated steel pipe joint device, and more particularly, to a corrugated steel pipe connecting the ends of a pair of corrugated steel pipes disposed to face each other while preventing internal fluid from leaking It relates to a prefabricated corrugated steel pipe using a steel pipe joint device and a corrugated steel pipe joint device.

In general, a corrugated steel pipe is formed in a hollow tubular shape, a spiral trough is formed along the longitudinal direction on the outer circumferential surface, and is a type of pipe in which a mountain is formed between the troughs along the longitudinal direction of the corrugated steel pipe. Corrugated steel pipe has high external pressure strength, durability and excellent workability, so it is used as a substitute for a fume plate that guides the discharge of various domestic wastewater, or as a duct to guide the flow of various fluids including air.

These corrugated steel pipes are used by connecting a plurality of them according to the construction length. The conventional connection of the corrugated steel pipe is made through the steps of wrapping the terminal end of the corrugated steel pipe with a band member, and fixing the band member surrounding the corrugated part through a coupling unit such as a clamp so that it is tightened toward the center of the corrugated steel pipe. In addition, by blocking the leakage space formed between the band member and the valley of the corrugated steel pipe, it is possible to prevent the fluid flowing inside the corrugated steel pipe from leaking.

Republic of Korea Patent Registration No. 10-0989438 discloses a 'sheet-integrated corrugated steel pipe coupling band' that seals the leaking space by injecting foam at high pressure between the corrugated steel pipe and the band.

The above sheet-integrated corrugated steel pipe coupling band can firmly connect the corrugated steel pipe by sealing the leaking space with the foam injected at high pressure. This is impossible, and there is a disadvantage in that the manufacturing cost of the corrugated steel pipe increases.

Republic of Korea Patent No. 10-0989438: Sheet-integrated corrugated steel pipe coupling band Republic of Korea Patent Registration No. 10-2044690: Connection structure of joints of corrugated steel pipe

The present invention has been devised to improve the above problems, and it is an object of the present invention to provide a corrugated steel pipe joint device capable of blocking the leakage space regardless of twisting of the corrugated steel pipe, and a prefabricated corrugated steel pipe using the corrugated steel pipe joint device there is.

In addition, an object of the present invention is to provide a corrugated steel pipe joint device and a prefabricated corrugated steel pipe using the corrugated steel pipe joint device, which has a low manufacturing cost and improved on-site constructability because a general clamp can be applied.

In order to solve the above technical problem, the corrugated steel pipe joint device according to the present invention is a corrugated steel pipe in which a spiral trough is formed along the longitudinal direction on an outer circumferential surface and a mountain is formed between the troughs along the longitudinal direction at the end of the corrugated steel pipe. A sealing unit coupled to a bottom surface and having a band portion coupled to the bottom surface and coupled to the watertight portion along the extension direction of the valley and the adjacent mountain along the direction toward the center, and the sealing unit at the end of the corrugated steel pipe A second inner diameter smaller than the first inner diameter so that the sealing units on the outside of the corrugated steel pipe can each enter and receive so that the corrugated steel pipes arranged in series with each other can be coupled by insertion from the outside. The sealing unit and the corrugated steel pipe are protruded so as to be in close contact with the ends of the sealing unit and the corrugated steel pipe on both sides, and a gasket unit having a packing part communicating the corrugated steel pipe with each other, and coupled to surround the outer side of the sealing part, tightening force in the central direction of the corrugated steel pipe It contains a binding unit that exerts.

According to one aspect of the present invention, the watertight portion is formed of a flexible material that is deformed to be in close contact with the bottom of the bone by the tightening force applied from the coupling unit, and the band portion is formed of an inner circumferential surface by the tightening force applied from the coupling unit. It is formed of a flexible material that is deformed to surround the adjacent mountain.

According to another aspect of the present invention, the length of the watertight portion from one end mounted on the bone to the other end helically extending in the extension direction of the bone to be exposed at the end of the corrugated steel pipe is from the one end to the corrugated steel pipe. It is formed to have a length greater than or equal to the position where the other end of the watertight part intersects with the extension line in the longitudinal direction of the .

According to another aspect of the present invention, the sealing unit is formed to protrude from the inner circumferential surface of the band part in a shape corresponding to the mountain adjacent to the watertight part, and from the peak of the mountain to the watertight part in one direction and away from the watertight part. It further includes an auxiliary watertight part that enters the gap formed between the band part and the corrugated steel pipe from both sides in the other direction.

According to another aspect of the present invention, the packing portion is formed so that the second inner diameter is smaller than the inner diameter of the corrugated steel pipe to provide a close contact area of the end of the corrugated steel pipe to be expanded.

According to another aspect of the present invention, the gasket unit is formed to extend from the lower end toward the center of the packing part in both directions along the longitudinal direction of the corrugated steel pipe to have a width wider than the width of the packing part and is inserted into the corrugated steel pipe. The end portion enters the inside and further includes a fitting jaw that is in close contact with the inner circumferential surface of the corrugated steel pipe.

And in order to solve the above technical problem, the prefabricated corrugated steel pipe using the corrugated steel pipe joint device according to the present invention is a corrugated steel pipe in which a spiral trough is formed along the longitudinal direction on the outer circumferential surface and a mountain is formed between the corrugations along the longitudinal direction, , A sealing unit having a band portion coupled to the bottom surface of the valley at the terminal end of the corrugated steel pipe and coupled to the watertight part along the extension direction of the valley and the adjacent mountain along the direction toward the center The sealing unit on the outside of the corrugated steel pipe is installed so that the sealing unit is mounted at the end of the corrugated steel pipe to connect the corrugated steel pipes arranged in series with each other by inserting from the outside. A gasket unit having a second inner diameter smaller than the first inner diameter so that it can be entered and accommodated, and the sealing unit and the end portions of the corrugated steel pipe are in close contact with both sides of the gasket unit, and the gasket unit having a packing portion for communicating the corrugated steel pipe with each other, and the sealing; It includes; a coupling unit coupled to surround the outside of the part to exert a tightening force in the central direction of the corrugated steel pipe.

As described above, the prefabricated corrugated steel pipe using the corrugated steel pipe joint device and the corrugated steel pipe joint device according to the present invention has a band portion that is in close contact with the outer circumferential surface of the corrugated steel pipe by the tightening force applied from the coupling unit, and is in close contact with the bottom of the valley of the corrugated steel pipe. By having a watertight part to prevent water leakage, it has the advantage of being able to connect the corrugated steel pipe to prevent water leakage.

1 is an exploded perspective view of a corrugated steel pipe joint device according to a first embodiment of the present invention;
2 is a cross-sectional view showing a state in which the corrugated steel pipe of FIG. 1 is connected;
3 is a cross-sectional view of a corrugated steel pipe joint device according to a second embodiment of the present invention;
4 is a cross-sectional view of a corrugated steel pipe joint device according to a third embodiment of the present invention;
5 is an exploded perspective view illustrating a state in which the watertight part of FIG. 1 is further extended.

1 to 2 show a corrugated steel pipe joint device according to a first embodiment of the present invention in order to solve the above technical problem.

Referring to the drawings, the corrugated steel pipe joint device according to the first embodiment of the present invention includes the sealing unit 20 installed at the end of the corrugated steel pipe 10, and the corrugated steel pipe 10 and the sealing unit 20 to surround the sealing unit 20. It includes a gasket unit 40 to be coupled, and a coupling unit 60 installed outside the gasket unit 40 to exert a tightening force in the central direction of the corrugated steel pipe 10 .

The corrugated steel pipe 10 is formed in a hollow tubular shape. On the outer peripheral surface of the corrugated steel pipe 10, a spiral valley 11 is formed along the longitudinal direction. A mountain 12 is formed between the valleys 11 along the longitudinal direction of the corrugated steel pipe 10 .

The sealing unit 20 includes a watertight portion 21 coupled to the bottom surface of the valley 11 at the end of the corrugated steel pipe 10, and a watertight portion 21 and a mountain 12 at the end of the corrugated steel pipe 10. It has a band portion that is coupled to the surrounding.

The watertight portion 21 has an annular or cross-sectional shape of the corrugated steel pipe 10 and is coupled to the bottom surface of the corrugated steel pipe 10 on the outer peripheral surface of the corrugated steel pipe 10 along the extension direction of the corrugated steel pipe 10. It is formed extending in the direction toward the center from the part. That is, the watertight portion 21 is formed in a spiral shape having the same pitch and lead angle as the valleys 11 of the bang-shaped steel pipe 10 . The watertight part 21 has a length from one end mounted on the valley 11 to the other end that is helically extended along the extension direction of the valley 11 so as to be exposed at the terminal end of the corrugated steel pipe 10, from one end to the corrugated steel pipe ( 10) is formed to have a length greater than or equal to the position where the other end of the watertight part 21 intersects with respect to the extension line in the longitudinal direction. In the drawing, the extension line intersects the other end of the watertight part 21 . That is, the watertight portion 921) formed in a spiral shape of one rotation is shown. In the drawings, the watertight part 21 is formed in a circular cross-section, but is not limited thereto, and may be manufactured in various shapes according to the cross-sectional shape of the valley 11 and the intention of the designer. In addition, the watertight part 21 may be formed in a spiral shape having a plurality of rotations as shown in FIG. 5 .

The watertight part 21 is formed of a flexible material that is deformed in close contact with the bottom surface of the bone 11 by the tightening force applied from the coupling unit 60 . In addition, it is preferable that the watertight part 21 has elasticity to close and occupy the upper part of the seated bone 11 when a tightening force is applied by the coupling unit 60 . Such flexible materials include rubber, silicone, or synthetic resin materials. Alternatively, the watertight part 21 may be made of a water expansion index material. The water expansion index material may be applied to include rubber material, bentonite, natural sodium. The water expansion index material expands in volume while in contact with water, and maintains an expansion pressure of 6 km/cm ² or more to more firmly block the leaking space 13 to be described later.

The band portion 25 is formed in a band shape. The band portion 25 is coupled to the watertight portion 21 and the watertight portion 21 at the end of the corrugated steel pipe 10 to surround the adjacent mountain 12 in the direction toward the center. That is, the band part 25 is fixed so that the watertight part 21 is in close contact with the valley 11 of the corrugated steel pipe 10 and is in close contact with the mountain 12 of the corrugated steel pipe 10 at the same time. In this state, between the outer circumferential surface of the corrugated steel pipe 10 and the inner circumferential surface of the band portion 25, a spiral-shaped leaking space 13 is formed along the path where the valley 11 is formed. The band portion 25 is formed of a flexible material that is deformed to surround the inner circumferential surface and the adjacent mountain 12 by the tightening force applied from the coupling unit 60 . The band portion 25 may be made of a water expansion index material that expands when in contact with water.

The sealing part 20 of this embodiment shown in the drawings is made of a divided structure in which the watertight part 21 and the band part 25 are formed, but may also be integrally formed.

The gasket unit 40 includes a sealing part 41 formed in a hollow tubular shape, and a packing part 45 protruding from an inner circumferential surface of the sealing part 41 .

The sealing part 41 is formed in a cylindrical shape having a hollow of the first inner diameter (D1). The sealing part 41 can be coupled by inserting the sealing unit 20 to each other and the corrugated steel pipes 10 arranged in series with each other by inserting the sealing unit 20 from the outside. To this end, the first inner diameter D1 of the sealing part 41 is formed to have a size that the sealing unit 20 can enter and accommodate.

The packing portion 45 protrudes from the inner peripheral surface of the sealing portion 41 to have a second inner diameter D2 smaller than the first inner diameter D1 and is formed in an annular plate shape having a predetermined width. The packing part 45 restricts the additional insertion of the sealing unit 20 and the corrugated steel pipe 10 while the sealing unit 20 and the ends of the corrugated steel pipe 10 are in close contact with both sides and the corrugated steel pipe 10. communicate with each other The packing part 45 has a second inner diameter (D2) smaller than the inner diameter (D3) of the corrugated steel pipe (10) to provide an extended contact area of the terminal end of the corrugated steel pipe (10). That is, all ends of the corrugated steel pipe 10 are in close contact with the packing part 45 in a state in which the corrugated steel pipe 10 with the sealing unit 20 is attached to the side of the packing part 45 is in close contact with the packing part 45. . In this state, the longitudinal section of the corrugated steel pipe 10 is blocked so that the corrugated steel pipe 10 can be firmly supported by the packing 45 as well as preventing fluid from leaking from the inside of the corrugated steel pipe 10. have an effect

The coupling unit 60 is coupled to surround the outside of the gasket unit 40 , and includes at least one clamp unit 61 installed in close contact with the outer circumferential surface of the sealing unit 41 of the gasket unit 40 , and the clamp unit. The flange portions 63 respectively formed at both ends of the 61 and the flange portions 63 formed in the flange portion 63 are fastened to pass through the assembly holes 64 formed in the flange portions 63 to bring the flange portions 63 on both sides into close contact with each other in close contact with each other. It includes a fixing part 67 that exerts a tightening force in the central direction of the steel pipe (10).

The clamp unit 61 has a curvature corresponding to the curvature of the sealing unit 41 so as to form a hollow shaft surrounding the outside of the sealing unit 41 in a state in which a plurality of clamp units are arranged to surround the outside of the sealing unit 41 and It is formed in the shape of a divided cylinder of length. The fixing part 67 includes a fixing bolt 68 that is through-coupled to the assembly hole 64 of the flange part 63 and a fixing nut 44 coupled thereto.

In this embodiment, the two clamping parts 61 are coupled to each other to form a hollow shaft surrounding the outside of the sealing part 41 and have the same configuration as a pipe clamp. The coupling unit 60 is not limited thereto and is made of a different type of pipe clamp having three or more clamping parts, or by tightening a strap surrounding the outside of the sealing part 41 to a smaller diameter to exert a tightening force. It may consist of the same configuration as the strap clamp of the method.

Hereinafter, the procedure and effect of connecting the corrugated steel pipe using the corrugated steel pipe joint device according to the first embodiment of the present invention configured as described above will be described.

The operator arranges the corrugated steel pipe 10 to which the sealing unit 20 is coupled to face each other. Thereafter, the operator inserts each sealing unit 20 and the ends of the corrugated steel pipe 10 in close contact with both sides of the packing part 45 from the inside of the sealing part 41 .

Then, the clamp portion 61 is coupled to the outside of the sealing portion 41 so that the assembly port 64 of each flange portion 63 is in a straight line. In this state, the fixing bolt 68 is inserted into each assembly port 64 forming a straight line, and the fixing nut 69 is fastened to couple the flange portions 63 in a direction in which they are in close contact with each other.

The clamp part 61 presses the outside of the sealing part 41 when the flange parts 63 are coupled in a direction in which they are in close contact with each other by the fixing part 67, thereby forming the sealing part ( 41) and the sealing part 20 exerts a tightening force in close contact with the outer peripheral surface of the corrugated steel pipe (10). When the fixing nut 44 is tightened so that the respective flange portions 63 are close to each other in a state in which the coupling unit 60 is assembled from the outside of the sealing unit 41 , the clamp unit 61 is closed through the sealing unit 41 . A tightening force is applied to bring the sealing unit 20 into close contact with the outer circumferential surface.

Accordingly, the band portion 25 increases the contact area with the mountain 12 of the corrugated steel pipe 10 due to the tightening force applied from the outside. The band portion 25 is in close contact with the mountain 12 of the corrugated steel pipe 10 and at the same time presses the watertight portion 21 coupled to the bone 11 so that the watertight portion 21 is in close contact with the bottom of the bone 11 . . At this time, due to the tightening force, the watertight part 21 is elastically deformed into a cross-sectional shape that closes the space between the valley 11 and the mountain 12, thereby closing the leaking space 13 at the end of the corrugated steel pipe 10. .

In the corrugated steel pipe joint device according to the first embodiment of the present invention configured as described above, the packing part 45 primarily closes the ends of the mutually connected longitudinal valleys 11 of each corrugated steel pipe 10 to form a corrugated steel pipe. Blocks the fluid flowing through the inside of the steel pipe 10 from flowing into the valley 11, and the band 25 blocks the outer circumferential surface of the corrugated steel pipe 10 even if the fluid flows into the valley 11 secondarily. At the same time to prevent the outflow to the outside, the fluid is prevented from flowing out along the path of the bone 11 by closing the space formed between the bone 11 and the band part 25 by the watertight part 21 .

As described above, the corrugated steel pipe joint device according to the first embodiment of the present invention prevents the fluid from leaking along the path of the valley 11 when the corrugated steel pipe 10 is joined. In addition, it can be applied regardless of the spiral direction in which the valleys 11 and the peaks 12 of the corrugated steel pipe 10 connected to each other are formed, and the mutually opposed valleys 11 and mountains 12 of the corrugated steel pipe 10 are connected. It has the advantage of excellent workability and maintainability in the field because it does not require a procedure to match In addition, since hot work such as welding is not required to connect the corrugated steel pipe 10, it has the advantage of being suitable for on-site repair of the corrugated steel pipe 10 through which a fluid containing flammable gas flows.

3 shows a corrugated steel pipe joint device according to a second embodiment of the present invention. Since it is the same as the first embodiment except for the sealing unit 20, a detailed description thereof will be omitted.

Referring to the drawings, the sealing unit 20 is formed to protrude from the inner circumferential surface of the band part 25 in a shape corresponding to the watertight part 21 and the adjacent mountain 12, and from the peak of the mountain 12 to the watertight part 21 and It further includes an auxiliary watertight part 27 that enters the gap 14 formed between the band part 25 and the corrugated steel pipe 10 on both sides of the approaching one direction and the watertight part 21 and the other direction away from it.

The auxiliary watertight part 27 is coupled to the side surface in one direction and the side surface in the other direction of the mountain 12 so as to be in close contact with it, and extends from the terminal end of the corrugated steel pipe 10 toward the center along the extension direction of the mountain 12 . is formed

The auxiliary watertight part 27 has a length from one end mounted on the mountain 12 to the other end that is helically extended along the extension direction of the mountain 12 so as to be exposed at the terminal end of the corrugated steel pipe 10 from one end to the corrugated steel pipe. It is formed to have a length equal to or greater than the position where the other end of the watertight part 21 intersects with the extension line in the longitudinal direction of (10).

In the drawing, the extension line is in a state that intersects the other end of the auxiliary watertight part 27 . That is, the auxiliary watertight portion 27 formed in a spiral shape of one rotation is shown.

The auxiliary watertight part 27 is integrally formed with the band part 25 and may be made of the same material as the band part 25 .

When the band part 25 is pressed in the center direction of the corrugated steel pipe 10 by the tightening force applied from the coupling unit 60, the auxiliary watertight part 27 is in close contact with the wider area of the adjacent mountain 12 and the watertight part ( By occupying the gap 14 not occupied by 21), the space between the valley 11 and the mountain 12 can be more firmly closed.

The auxiliary watertight portion 27 configured as described above has the advantage of exerting a sealing force, which is a supplementary chuck for maintaining airtightness, in interconnecting the large-diameter corrugated steel pipe 10 with a large size of the valley 11 .

In addition, the auxiliary watertight part 27 enters in one direction closer to the watertight part 21 and auxiliaryly applies the tightening force applied from the coupling unit 60 to the watertight part 21, at this time the watertight part 21 leaks. It has an additional advantage of facilitating elastic deformation to the cross-sectional shape of the space 13 .

4 shows a corrugated steel pipe joint device according to a third embodiment of the present invention. Since the gasket unit 40 is the same as that of the first embodiment, a detailed description thereof will be omitted.

The gasket unit 40 extends from the lower end toward the center of the packing part 45 in both directions along the longitudinal direction of the corrugated steel pipe 10 to have a width wider than the width of the packing part 45 and is inserted into the corrugated steel pipe ( The end portion of 10) enters the inside and further includes a fitting protrusion 47 that is in close contact with the inner circumferential surface of the corrugated steel pipe 10.

The fitting jaw 47 is formed to have a cylindrical shape having an outer diameter 124 having the same dimension as the inner diameter D3 of the corrugated steel pipe 10 . The inner peripheral surface of the sealing part 41, the outer peripheral surface of the packing part 45, and the outer peripheral surface of the fitting protrusion 47 form a fitting space 48 through which the terminal end of the corrugated steel pipe 10 enters the inside. Through this configuration, when the end of the corrugated steel pipe 10 is inserted so as to be in close contact with the side surface of the packing part 45 , the inner circumferential surface of the end of the corrugated steel pipe 10 is in close contact with the outer circumferential surface of the fitting jaw 47 .

The fitting jaw 47 is in close contact with a part of the inner circumferential surface of the corrugated steel pipe 10 to increase the contact area for sealing the end of the corrugated steel pipe 10, and the fluid inside the corrugated steel pipe 10 flows into the leaking space 13 It provides the advantage of additionally preventing

Hereinafter, a prefabricated corrugated steel pipe using a corrugated steel pipe joint device according to a preferred embodiment of the present invention will be described. Except for the corrugated steel pipe connecting body, the detailed description will be omitted since it is the same as the corrugated steel pipe connecting device according to the first embodiment of the present invention.

In the prefabricated corrugated steel pipe using the corrugated steel pipe joint device according to a preferred embodiment of the present invention, a spiral valley 11 is formed on the outer circumferential surface along the longitudinal direction, and each mountain 12 between the valleys 11 along the longitudinal direction. The formed corrugated steel pipe 10 and the watertight part 21 and the watertight part 21 and the center are coupled to the bottom surface of the valley 11 at the terminal end of the corrugated steel pipe 10 along the extension direction of the valley 11 A corrugated steel pipe connecting body having a sealing unit 20 having a band portion 25 coupled to and surrounding an adjacent mountain 12 along the direction toward the The sealing unit 20 on the outside of the corrugated steel pipe 10 enters and accommodates each other so that the corrugated steel pipes 10 arranged in series can be coupled by insertion from the outside. A gasket unit 40, which protrudes to have a small second inner diameter, closes the sealing unit 20 and the ends of the corrugated steel pipe 10 to both sides, and includes a packing 45 for communicating the corrugated steel pipe 10 with each other; It includes a coupling unit 60 coupled to surround the outer side of the sealing part 41 to exert a tightening force in the central direction of the corrugated steel pipe 10 . The corrugated steel pipe 10 and the watertight part 21 constituting the corrugated steel pipe connection body are the same as those described in the corrugated steel pipe joint device according to the first embodiment of the present invention.

As described above, the prefabricated corrugated steel pipe using the corrugated steel pipe joint device according to the preferred embodiment of the present invention is provided at the site in a state in which the corrugated steel pipe 10 and the watertight part 21 are assembled, so that the assembly and installation can be performed quickly in the field. It has the advantage of being able to

10: corrugated steel pipe 11: bone
12: acid 20: sealing unit
40: gasket unit 60: coupling unit

Claims (7)

A spiral trough is formed on the outer circumferential surface along the longitudinal direction and is coupled to the bottom of the corrugated steel pipe at the end of the corrugated steel pipe in which a mountain is formed between the valleys along the longitudinal direction, and the watertight portion and the watertight along the extension direction of the trough a sealing unit having a band portion coupled to the portion and the adjacent mountain in a direction toward the center;
The sealing unit is mounted at the end of the corrugated steel pipe so that the sealing units on the outside of the corrugated steel pipe can each enter and be accommodated so that the corrugated steel pipes arranged in series can be coupled by inserting each other from the outside. a gasket unit which protrudes to have a second inner diameter smaller than the first inner diameter so that the sealing unit and the end portions of the corrugated steel pipe are in close contact with each other on both sides, and the gasket unit includes a packing portion for communicating the corrugated steel pipe with each other;
and a coupling unit coupled to surround the outer side of the sealing part to exert a tightening force in the central direction of the corrugated steel pipe. The method of claim 1,
The watertight part is formed of a flexible material that is deformed to be in close contact with the bottom of the bone by the tightening force applied from the coupling unit,
Corrugated steel pipe joint device, characterized in that the band portion is formed of a flexible material that is deformed to surround the mountain adjacent to the inner circumferential surface by the tightening force applied from the coupling unit. 3. The method of claim 2,
The length of the watertight portion from one end mounted on the bone to the other end helically extending along the extension direction of the bone to be exposed at the terminal end of the corrugated steel pipe is from the one end to the extension line of the corrugated steel pipe in the longitudinal direction. Corrugated steel pipe joint device, characterized in that it is formed to have a length greater than or equal to the position where the other end of the watertight part intersects. 3. The method of claim 2,
The sealing unit is formed to protrude from the inner circumferential surface of the band portion in a shape corresponding to the mountain adjacent to the watertight portion, and the band portion and the Corrugated steel pipe joint device, characterized in that it further comprises an auxiliary watertight part that enters the gap formed between the corrugated steel pipe. The method of claim 1,
Corrugated steel pipe joint device, characterized in that the packing portion is formed to be smaller than the inner diameter of the second inner diameter of the corrugated steel pipe so as to provide a close contact area of the terminal end of the corrugated steel pipe. The method of claim 1,
The gasket unit is formed to extend from the lower end toward the center of the packing part in both directions along the longitudinal direction of the corrugated steel pipe to have a width wider than the width of the packing part, the end of the inserted corrugated steel pipe enters the inside, and the corrugated steel pipe Corrugated steel pipe joint device, characterized in that it further comprises a fitting jaw that is in close contact with the inner peripheral surface of the. A corrugated steel pipe in which a spiral trough is formed on the outer circumferential surface along the longitudinal direction and a mountain is formed between the troughs along the longitudinal direction, coupled to the bottom surface of the trough at the end of the corrugated steel pipe, along the extension direction of the corrugated steel pipe a corrugated steel pipe connecting body including a sealing unit having a watertight part and a band part coupled to the watertight part and the adjacent mountain along a direction toward the center;
The sealing unit is mounted at the end of the corrugated steel pipe so that the sealing units on the outside of the corrugated steel pipe can each enter and be accommodated so that the corrugated steel pipes arranged in series can be coupled by inserting each other from the outside. a gasket unit which protrudes to have a second inner diameter smaller than the first inner diameter so that the sealing unit and the end portions of the corrugated steel pipe are in close contact with each other on both sides, and the gasket unit includes a packing portion for communicating the corrugated steel pipe with each other;
A prefabricated corrugated steel pipe using a corrugated steel pipe joint device, comprising a; a coupling unit coupled to surround the outer side of the sealing portion to exert a tightening force in the central direction of the corrugated steel pipe.

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