JPH09257189A - Flexible pipe body made by forming steel wire into spiral form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily bend a pipe body without impairing the strength by arranging connecting steel wires in the longitudinal direction and in the vicinity of the neutral axis in the bending direction of a flexible pipe body obtained by winding spirally a steel wire an interval, and by fixing the connecting steel wires to the pipe body. SOLUTION: A flexible pipe body 1 is obtained by forming a steel wire 2 into a cylindrical spiral, and an internal 3 is provided among the wire 2. In bending both end parts 6 of the pipe body 1 up- or down-ward in the vertical plane, two lines of connecting steel wires 4 are arranged inside the pipe body 1, in the longitudinal direction, in the vicinity of the neutral axis of the pipe body 1, and symmetrically, and the crossing 5 of the wires 4 and the wire 2 is welded. When both end parts 6 are buried in the ground after they are bent upward/downward or in the reverse direction, since the wire 4 is not affected by the stress in the direction of elongation or contraction, one can stably bend the pipe body 1 along the wire 4 into the state as desired and hold the pipe body 1 as it is, avoiding the laterial buckling of the wire 2. Accordingly, the strength almost as high as that of the pipe with a closed cross section can be obtained, and the pipe body can easily be bent manually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible pipe used as a protective pipe for electric wires and other flexible long wires buried in soil in various industrial fields such as rainwater pipes, water pipes and the like. In particular, the present invention relates to a flexible pipe body applied to a place where a protective pipe is bent and laid.

[0002]

2. Description of the Related Art Various pipes and flexible long wires (hereinafter collectively referred to as main pipes) buried in the ground or laid in tunnels, etc. (hereinafter collectively referred to as main pipes) are subject to earth pressure and corrosion. Alternatively, since the main pipe may be damaged due to vehicle load, collision with other objects, etc., a protective pipe is used to protect the main pipe.

This protection tube may be a straight protection tube as long as it has only a straight portion when the main protection tube is buried in the ground. Therefore, it is a rigid protection tube which has strength and is inflexible. No problem. However, in reality, when a case occurs where the existing pipeline intersects with the existing pipeline while laying the new pipeline, in order to avoid contact between the pipelines, the new pipeline is placed above or below the existing pipeline, or Bending right and left is laid.

In this case, a hard protective tube is generally used for the straight pipe section of the new pipeline, but a flexible protective tube is used for the bent pipeline section, and this flexible tube is used in the field work. The sex protection tube is bent to a required angle and connected to the hard protection tube through the joint tubes at both ends.

A corrugated tube made of synthetic resin is often used as the conventional flexible protective tube used for the above-mentioned applications.
Although this corrugated protection tube has excellent flexibility, it is poor in reliability in terms of strength with respect to overload, impact load and the like. Therefore, when the above-mentioned protective pipe is used for the buried pipe (main pipe) where a large load may be applied, it is necessary to reinforce the protective pipe with concrete or the like.

As a conventional technique for overcoming the above-mentioned problems,
A flexible protective steel pipe disclosed in Japanese Unexamined Patent Publication No. 1-188789, which is continuously corrugated in the pipe axial direction, is known.
This protective steel pipe has a structure that effectively utilizes the strength of the steel material to protect the contents (main pipe) from earth pressure, overburden load, and impact load from heavy machinery during re-excavation. It is characterized by two points: it is a structure that has flexibility so that it can protect the inclusions (main pipes) that are forced to be buried while avoiding piping and existing structures. ing.

[0007]

SUMMARY OF THE INVENTION However, Japanese Patent Laid-Open Publication No. 1-1
In the case of the 88789 protective steel pipe, although it has flexibility, it has a high rigidity (a wall thickness of 1.5 to 5.0 m).
Since m) is used, the pipe cannot be bent manually, and a tool is required to bend this protective steel pipe. Therefore, there is a problem that the laying work is more complicated than that of the protective flexible tube made of synthetic resin or the like.

Further, in the case of the above-mentioned protective steel pipe, since the corrugation is continuously machined and manufactured in the axial direction of the steel pipe having high strength, the corrugation is continuously formed while maintaining the accuracy of the corrugation. It is necessary to apply it to steel materials. For this reason, there is a problem that advanced processing technology and dedicated equipment are required, resulting in high manufacturing cost. It is an object of the present invention to provide a flexible pipe body in which a steel wire having a spiral shape is formed to solve the above problems.

[0009]

In order to achieve the above-mentioned object, a flexible pipe body in which a steel wire according to the present invention is spirally wound has a gap between adjacent steel wires formed by spirally winding the steel wire. A flexible pipe body having a, the steel wire for connection is arranged along the longitudinal direction in the vicinity of the neutral axis in the bending direction of the flexible pipe body, and the steel wire for connection is fixed to each of the steel wires by welding. It is characterized by

The flexible tubular body of the present invention in which a steel wire is formed in a spiral shape is formed by spirally winding a steel wire to form a flexible tubular body having a gap between adjacent steel wires. A joining steel wire is arranged along the longitudinal direction in the vicinity of the neutral axis of the bending direction, and the joining steel wire is fixed to each of the steel wires by welding or the like. Then, the joining steel wire is cut in parallel in the longitudinal direction of the flexible pipe, and the joining joining steel wire is arranged in a plurality of rows in the circumferential direction so that the cut ends are aligned between the respective wire rows, The steel wire for split connection and the steel wire thus cut are fixed to each other.

Further, joint pipes may be provided at the front and rear ends of the flexible pipe body. Further, the outer circumference of the flexible pipe body may be covered with a covering material having water blocking property and elasticity. Further, a flexible main pipe is arranged inside the flexible pipe body. Further, a spacer may be arranged between the flexible pipe body and the main pipe, or a filler may be filled.

In the flexible pipe body of the present invention, the spirally formed steel wire and the joining steel wire are combined to advantageously overcome the weakness of the spiral pipe body, that is, the steel wire falls over sideways. Moreover, since the steel wire having high strength can be used, it is possible to easily manufacture the flexible pipe body for protecting the main pipe, which can withstand a large overload and a large impact.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. 1 to 3 show a first embodiment of the present invention.
The flexible pipe body 1 is configured to have a predetermined length L by spirally forming a long steel wire 2 in a circular shape, and the flexible pipe body 1 has a predetermined length L between the rolled steel wires 2. A gap 3 is formed. For example, when both ends of the flexible pipe body 1 are bent vertically along a vertical plane in FIG. 1, the flexible pipe body 1 extends in the longitudinal direction (pipe axis direction) in the vicinity of the neutral axis 9 of the flexible pipe body 1 and inside the pipe body. Then, two long connecting steel wires 4 are arranged at symmetrical positions of the pipe body, and the crossing portion 5 between the two connecting steel wires 4 and the steel wire 2 is fixed by welding. There is.

In the flexible tube 1, both ends 6, 6 are both bent upward or downward, or one end 6 is bent upward and the other end 6 is bent downward, or in the opposite relationship. When bending and laying in the ground, in any of the above cases, since the joining steel wire 4 is located in the vicinity of the neutral axis 9 in the bending direction of the flexible pipe 1, the flexible pipe 1 is joined even if it is bent. No stress acts on the steel wire 4 for expansion or contraction. Therefore,
The flexible tube body 1 can be stably bent and formed along the joining steel wire 4 in an intended bending mode, and the bent and bent state can be smoothly maintained, and the flexible tube body 1 can be bent in any bent state. Also in this case, the steel wire 2 spirally formed can be prevented from falling sideways by the joining steel wire 4, and the tubular shape can be smoothly maintained with the gap 3 of each steel wire 2 being properly maintained.

A second embodiment of the present invention is shown in FIGS. In this example, the steel wire 4 for coupling the flexible tube body 1 according to the first embodiment of the invention is used.
In addition to this, the connecting steel wire 4 is arranged at a different position, and the split connecting steel wire 7 is cut in parallel with the connecting steel wire 4 and in the longitudinal direction (pipe axis direction) of the flexible pipe 1a. But there is a cut end 8 between each line
Are arranged in a plurality of rows in the circumferential direction so that they are aligned, and the cut split connecting steel wire 7 and steel wire 2 are cut.
The intersection 10 with and is fixed by welding.

In the second embodiment of the present invention, in addition to the action and effect of the flexible tube body 1 in the first embodiment of the invention, the split connecting steel wire 7 is used. , This flexible tube 1a
When a large load is locally applied to the steel wire 2, it is possible to prevent a large deformation of only the plurality of winding portions of the steel wire 2 formed in a spiral shape, on which the load is applied. Moreover, the presence of the split connecting steel wire 7 does not impair the flexibility of the flexible tube body 1a as in the case of the first embodiment of the invention.

7 to 10 show a third embodiment of the present invention. In this example, the circular joint pipes 11 and 12 are fixed to the steel wire 2 by the welded portions 13 at both ends of the flexible pipe body 1 having the same structure as that of the first embodiment of the invention. . Therefore,
In the third embodiment of the present invention, the circular joint pipe 11 on one end side of one flexible pipe body 1 is fitted into the expanded diameter inside 14 of the circular joint pipe 12 on the other end side of the other flexible pipe body 1. By doing so, a plurality of flexible pipes 1 can be connected to form a long flexible pipe having a required length.

11 to 14 show a fourth embodiment of the present invention. In this example, instead of the flexible tube body 1 made of the circular spiral steel wire 2 in the third embodiment of the invention, a square spiral steel wire 2 is used.
The point that the flexible pipe body 1b is constituted by a and the joint pipes provided at both ends of the flexible pipe body 1b corresponding to the a are shaped joint pipes 15, instead of the circular joint pipes 11, 12.
16 is different from the third embodiment,
The other structure is the same as that of the third embodiment of the invention. Therefore, in the fourth embodiment of the present invention, the rectangular joint pipe 15 on one end side of one flexible pipe body 1b is connected to the expanded inner diameter 17 of the rectangular joint pipe 1b on the other end side of the other flexible pipe body 1b. By fitting the flexible pipes 1b to each other, a plurality of flexible pipes 1b can be connected to form a long flexible pipe having a required length.

A fifth embodiment of the present invention is shown in FIGS. In this example, the joint pipes 18 and 19 are provided at both ends of the flexible pipe body 1 made of the steel wire 2 of the same circular spiral as in the third embodiment of the invention. It is slightly different from the circular joint pipes 11 and 12 in the third embodiment of the invention. Joint pipe 1 according to fifth embodiment of the invention
In Nos. 8 and 19, the inner end side is the cylindrical portion 21 and the outer end side is the square tubular portion 22 via the intermediate connection wall 20, and the inner end portion of the cylindrical portion 21 is the steel of the end portion of the flexible pipe body 1. It is fixed to the wire 2 at the weld 23. Therefore, when connecting the flexible tubes, the rectangular tube portion 22 on one end side of the one flexible tube body 1 is fitted into the enlarged diameter inside 24 of the rectangular tube portion 22 on the other end side of the other flexible tube body 1. Thus, a plurality of flexible tubes 1 can be connected to form a long flexible tube having a required length.

FIG. 19 shows a sixth embodiment of the present invention. In the sixth embodiment of the present invention, an example in which the outer periphery of a flexible pipe having the same structure as the flexible pipe 1 in the third embodiment of the present invention is coated with a coating material 25 having water blocking property and stretchability is described. It is shown. In the sixth embodiment of the present invention, due to the presence of the covering material 25, when the flexible pipe body 1 is laid in the ground, it is possible to prevent water and earth and sand from invading the inside of the flexible pipe body 1. The main pipe (not shown) disposed in the can be protected more reliably.

20 to 23 show a seventh embodiment of the invention. In this example, in the flexible pipe body 1 according to the third embodiment of the invention, the plurality of main pipes 26 inserted into the flexible pipe body 1 are not biased from each other,
Spacers (space keeping members) 27 are provided in the flexible tube body 1 at predetermined intervals so that a predetermined arrangement can be maintained. The spacer 27 is composed of a disc having a plurality of main tube insertion holes 28, and a recess 30 into which the joining steel wire 4 can be fitted is formed on the outer peripheral edge thereof. As shown in FIG. 21, the outer peripheral edge of the spacer 27 located in the middle of the plurality of spacers 27 is fixed to the spiral steel wire 2 by welding 31. The peripheral edges are fixed to the inner peripheral portions of the inner end edges of the circular joint pipes 11 and 12 by welding 32. According to the seventh embodiment of the present invention, the plurality of main pipes 26 can be reliably held inside the flexible pipe body 1 at equal intervals by the spacer 27 having a simple structure.

FIG. 24 shows a first application example of the present invention. In this example, when the protection pipe (small-diameter pipe) 33 accommodating the main pipe 26 is buried in the ground 35, another existing buried pipe 34 exists, so the main pipe 26 is avoided by avoiding the buried pipe 34. An example in which the flexible pipe body 1 of the present invention is applied to the case of burying is shown. That is, in FIG. 24, the straight intermediate protection pipe 33 is located below the protection pipes 33, 33 located at both ends to avoid the existing buried pipe 34, and the intermediate protection pipe 33 and the protection pipes 33 at both ends are provided. , 33
The flexible tube body 1 of the present invention is used as a protective tube connecting between the two. This flexible pipe body 1 is a pipe body covered with the covering material 25 shown in FIG. 19, and the flexible pipe body 1 is bent as shown in the drawing and laid in the ground. The flexible pipe body 1 and the protective pipe 33 are connected by fitting the circular joint pipes 11 and 12 (not shown) into the circular joint pipe (not shown) of the protective pipe 33.

FIG. 25 shows a second application example of the present invention. In this example, the flexible pipe 1b shown in FIG.
The example used by connecting to the protection pipe 37 of the underground 35 with 0 is shown. That is, as shown in this example, in the manhole portion 36, the underground conduit 38 connected thereto absorbs axial deformation (expansion and contraction) and rotational deformation (bending) relative to the manhole portion 36 during an earthquake. This is solved by the expansion joint 40 and the flexible tube body 1b according to the present invention.

That is, the expansion joint 40 has a large-diameter square tube portion 41 fixed at one end to the lower side surface of the manhole section 36, and can move in and out of the large-diameter square tube section 41 through a sliding packing (not shown). It is composed of a small-diameter square tube portion 42. In addition, the outer periphery of the flexible tube body 1b made of a square spiral steel wire 2a has a water-proof and stretchable covering material 2
One end of the flexible tubular body 1b is connected to a square tubular joint pipe (not shown) of the expansion joint 40, and the other is not covered. It is connected to a tube (not shown).

The flexible pipe body of the present invention can be used in any mode other than that shown in the drawings. For example, mortar, earth and sand or other filler (not shown) may be filled between the flexible pipe 1 and the main pipe 26 housed therein. The main pipe to be protected can be applied to various things.

[0026]

As described above, according to the present invention,
It has the following effects. By the connecting steel wire arranged in the cylinder axis direction of the steel wire formed in the spiral shape of the flexible pipe,
Since the gap between the steel wires can be properly held and the tubular body can be held in a tubular shape, strength equivalent to that of a pipe having a closed cross section can be obtained in the circumferential direction of the flexible tubular body.
Moreover, since the rigidity against bending can be reduced by disposing the joining steel wire in the vicinity of the neutral axis in the bending direction of the tubular body, it is possible to easily bend it by a worker without a special tool. The flexible tube is a tube formed by spirally forming continuous steel wire and fixing the joining steel wire in the vicinity of the neutral axis, so a large-scale device is not required for manufacturing and the manufacturing cost is low. Is. In a fixed part such as a manhole, by connecting the underground conduit to the fixed part through the expansion joint and the flexible pipe body of the present invention, rotation and expansion / contraction displacement occurring between the underground part and the fixed part during an earthquake Can be absorbed, and a structure having earthquake resistance can be configured.

[Brief description of drawings]

FIG. 1 is a perspective view of a flexible tube body according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the flexible tube body of FIG.

3 is a side view of the flexible pipe body of FIG. 2. FIG.

FIG. 4 is a perspective view of a flexible tube body according to a second embodiment of the present invention.

5 is a vertical cross-sectional view of the flexible pipe body of FIG.

6 is a side view of the flexible pipe body of FIG. 5. FIG.

FIG. 7 is a perspective view of a flexible tube body according to a third embodiment of the present invention.

8 is a right side view of the flexible pipe body of FIG. 9. FIG.

9 is a vertical cross-sectional view of the flexible tube body of FIG.

FIG. 10 is a left side view of the flexible tube body of FIG.

FIG. 11 is a perspective view of a flexible tube body according to a fourth embodiment of the present invention.

12 is a right side view of the flexible pipe body of FIG. 11. FIG.

13 is a vertical cross-sectional view of the flexible pipe body of FIG.

14 is a left side view of the flexible pipe body of FIG. 11. FIG.

FIG. 15 is a perspective view of a flexible tube body according to a fifth embodiment of the present invention.

16 is a cross-sectional view of the flexible pipe body of FIG.

17 is a right side view of the flexible pipe body of FIG. 16. FIG.

FIG. 18 is a left side view of the flexible pipe body of FIG. 16.

FIG. 19 is a perspective view of a flexible tube body according to a sixth embodiment of the present invention.

FIG. 20 is a perspective view of a flexible tube body according to a seventh embodiment of the present invention.

FIG. 21 is a vertical cross-sectional view of the flexible pipe body of FIG. 20.

22 is a front view of the spacer at the end of FIG. 21. FIG.

23 is a front view of the spacer in the middle portion of FIG. 21. FIG.

FIG. 24 is a partially cutaway perspective explanatory view of a first application example of the flexible tube body according to the present invention.

FIG. 25 is a partially cutaway perspective view of a second application example of the flexible pipe body according to the present invention.

[Explanation of symbols]

 1 Flexible Pipe 2 Steel Wire 3 Gap 4 Steel Wire for Connection 5 Intersection 6 Both Ends 7 Steel Wire for Split Connection 8 Cutting End 9 Neutral Shaft 10 Intersection 11 Circular Joint Pipe 12 Circular Joint Pipe 13 Welding Portion 14 Expanding Diameter Inner 15 Square joint pipe 16 Square joint pipe 17 Expanded inside 18 Joint pipe 19 Joint pipe 20 Intermediate connection wall 21 Cylindrical part 22 Square tube part 23 Welded part 24 Expanded inside 25 Coating material 26 Main pipe 27 Spacer 28 Main pipe insertion hole 30 recessed part 31 welding 32 welding 33 protection pipe 34 buried pipe 35 underground 36 manhole 37 protection pipe 38 underground pipe 40 expansion joint 41 large-diameter square tube part 42 small-diameter square tube part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Kimura 2-3-6 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Inventor Hidemitsu Matsuda 2--6, Otemachi, Chiyoda-ku, Tokyo No. 3 Nippon Steel Corporation (72) Inventor Yuji Koshino 19 Nakahama-cho, Amagasaki City, Hyogo Prefecture Nichia Steel Co., Ltd.

Claims (6)

[Claims] 1. A steel pipe is spirally wound to form a flexible pipe body having a gap between adjacent steel wires, and the flexible pipe body is connected along a longitudinal direction in the vicinity of a neutral axis of a bending direction of the flexible pipe body. Place the steel wire,
A flexible tubular body formed by spirally forming a steel wire, wherein the joining steel wire is fixed to each of the steel wires. 2. A steel wire is spirally wound to form a flexible pipe body having a gap between adjacent steel wires, and the flexible pipe body is connected in the vicinity of the neutral axis in the bending direction along the longitudinal direction. Place the steel wire,
The joining steel wire is fixed to each of the steel wires, and further, the joining position is different from that of the joining steel wire, and the split joining is cut in the longitudinal direction of the flexible pipe body in parallel with the joining steel wire. A plurality of steel wires for circumferential use are arranged in the circumferential direction so that the cut ends are aligned between the respective wire rows, and the cut split joining steel wire and the steel wire are fixed to each other. A flexible tube that is formed in a spiral shape. 3. The flexible pipe body according to claim 1, wherein joint pipes are provided at front and rear ends of the flexible pipe body. 4. The flexible tubular body for earth pressure countermeasures according to claim 1, wherein the outer periphery of the flexible tubular body is covered with a covering material having water blocking property and elasticity. 5. The steel wire according to claim 1, wherein a flexible main pipe is provided inside the flexible pipe body. A flexible tubular body formed in a spiral shape. 6. Between the flexible pipe body and the main pipe,
A flexible tubular body formed by spirally forming a steel wire according to claim 5, wherein a spacer for holding the main pipe is arranged or filled with a filler.