JPH11190475A - Synthetic resin corrugated pipe and joint part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin corrugated pipe to simplify connection during intercoupling of pipes and prevent the occurrence of engagement between the waves of sheath pipes when the pipes are pulled one by one in a single laying space. SOLUTION: A spiral corrugated part 1a where a groove part 10 and a crest part 11 are spirally formed on an outer periphery and an independent corrugated part 1b where the groove parts 12 and the crest parts 13 are independently paralleled and alternately formed on an outer periphery are formed in a mixed state. The outside diameter of the outer periphery of each of the crest parts 13 at the independent corrugated part 1b is decreased to a value lower than the outside diameter R1 of the outer periphery of the crest part 10 of the spiral corrugated part 1a. In a joint, a packing 2 is fitted in the groove 12 of the independent corrugated part 1b of an end part, a joint sleeve 3 is mounted in a watertight state on the outer periphery thereof, and slip out of the sheath pipe 1 from the joint sleeve 3 is prevented from occurring by a slip-out protection tool 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated pipe made of synthetic resin which can be suitably used for housing and protecting communication / electric cables and electric wires when wiring them.

[0002]

2. Description of the Related Art A sheath tube used to draw cables and electric wires inside is laid in a single space such as under a floor of a building or in a wall, or is laid in a plurality of places. It is installed in a state where a plurality of pipes (troughs, fume pipes, resin pipes, etc.) installed along the road network are drawn into a plurality of pipes. In this type of sheath tube, a corrugated tube made of a synthetic resin having a groove portion and a mountain portion formed on the outer periphery is often used. The reason is that, by forming a wave on the outer periphery, the mechanical strength is increased even if the weight is relatively light, and the cable can be laid while being bent at the time of retraction.

[0003] Synthetic resin corrugated pipes of this type are roughly classified into three types. First, as shown in FIG. 8, a corrugated tube 5 in which a groove 50 and a peak 51 are spirally formed on the outer periphery.
It is. Second, as shown in FIG. 9, a corrugated pipe 6 in which grooves 60 and peaks 61 are alternately formed on the outer circumference so as to be orthogonal to the pipe axis. The third is actual fairness 3-36187
As shown in FIG. 10,
A spiral waved portion 7a in which a groove 70 and a peak 71 are spirally formed on the outer periphery, and an independent waved portion 7b in which a groove 72 and a peak 73 are formed alternately on the outer periphery so as to be orthogonal to the tube axis. Mixed along the length direction, the outer diameter of the peak 71 of the spiral waved portion 7a,
The corrugated tube 7 is formed so that the outer diameter of the crest 73 of the independent corrugated portion 7b matches. When the corrugated tube 7 is connected to a socket portion of a box (not shown), if the socket portion has a groove adapted to a spiral wave, the spiral waved portion 7a is positioned by cutting, and this is inserted into the socket. When the socket portion has a groove adapted to an independent wave, it is suitable to position the independent grooved portion 7b at the end by cutting and connect it to the socket portion. .

[0004]

When the corrugated pipe 5 of FIG. 8 is to be connected, it is to be connected as shown in FIG.
5 are butt-fitted, and a seal sleeve 52 having a spiral wave is screw-fitted so as to straddle the outer periphery of the butt portion.
The sealing sleeve 52 and the putties 53, 53 are fixed by a band or tape 54 tightly wound around the outer periphery. The corrugated tube 5 in FIG.
Since the joint structure is the above-described structure, firstly, it takes time and effort to connect the corrugated pipes 5 to each other, and secondly, the outer peripheral grooves 5 are formed.
Since 0 is spiral (continuous), it is difficult to maintain the watertightness of the joint, and thirdly, the joint is easily enlarged, so that when the pipe is drawn into a large pipe and laid, it is difficult to maintain the watertightness. There were issues such as the space efficiency becoming extremely poor.

[0005] When connecting the corrugated pipe 6 of FIG.
A packing (not shown) is fitted into the groove 60 at the end of the tube 6, and then the end of the tube 6 is inserted and fixed into a sleeve (not shown) so that the packing comes into close contact with the sleeve.
Therefore, the connection between the pipes is simple, and the watertightness of the joint is maintained. However, when the bottom width of the outer trough 60 is wider than the top width of the crest 61, the corrugated pipe 6 of FIG. 9 draws one by one into a single installation space such as a large pipeline (not shown). As shown in FIG. 6, the groove portion 60 of the corrugated tube 6 that is drawn first and the crest 61 of the corrugated tube 6 that is drawn later are intertwined in a meshing manner, so that a larger drawing tension is required at the time of drawing. However, when the mutual engagement becomes deeper, it sometimes becomes impossible to retract.

When connecting the corrugated pipe 7 shown in FIG. 10, the independent corrugated portion 7b is positioned at the end by cutting or the like.
Since the pipes 7 may be connected in the same manner as the corrugated pipes 6, the pipes 7 can be easily connected to each other. However, since the outer diameters of the spiral corrugated portion 7a and the independent corrugated portion 7b are equal to each other, the valley portion 72 and the crest of the independent corrugated portion 7b may be engaged with each other at the time of being drawn into the large pipeline. There has been a problem that the outer diameter of the joint portion becomes excessively large, making the drawing operation difficult, and the space efficiency in the large-sized conduit deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to easily connect pipes at the time of connecting pipes, and to interlock waves between pipes when a plurality of pipes are drawn into a large pipe or other single space at different times. It is an object of the present invention to provide a synthetic resin corrugated tube capable of preventing the occurrence of a wave. Another object of the present invention is to improve the space efficiency of a large conduit for drawing the joint portion, which has a simple structure, good workability and good watertightness, does not have a much larger diameter than other portions, and draws in these portions. An object of the present invention is to provide a joint structure of a synthetic resin corrugated pipe that can be used.

[0008]

According to the present invention, a synthetic resin corrugated pipe and its joint structure are configured as follows to solve the above-mentioned problems. That is, the synthetic resin corrugated pipe according to claim 1 has a spiral corrugated section 1a of a predetermined length in which the groove 10 and the crest 11 are formed in a spiral shape on the outer periphery, and the outer periphery with respect to the tube axis. Independent grooves 1 that are almost orthogonal
2 and an independent corrugated portion 1b of a predetermined length in which the crests 13 are alternately formed so as to be mixed along the length direction, and the outer periphery of each crest 13 in the independent corrugated portion 1b is formed. The outer diameter r1 is smaller than the outer diameter R1 formed by the outer periphery of the peak portion 10 in the spiral wave attaching portion 1a.

According to a second aspect of the present invention, there is provided a synthetic resin corrugated tube according to the first aspect of the present invention, in which both ends of the spiral corrugated portion are provided with independent corrugations shorter than the spiral corrugated portion. Part 1b
It is characterized by having.

The synthetic resin corrugated pipe according to claim 3 is the synthetic resin corrugated pipe according to claim 1 or 2, wherein the inner diameter R2 of the groove 10 of the spiral corrugated section 1a and the independent corrugated section. 1b
And the inner diameter r2 of the groove 12 is the same.

According to a fourth aspect of the present invention, in the joint structure of a synthetic resin corrugated pipe, the independent corrugated section 1b is located at an end portion. A ring-shaped packing 2 is fitted into at least one groove 12 present in the independent corrugated portion 1b, and the joint sleeve is fitted in the independent corrugated portion 1b at the end so that the packing 2 is intimately inscribed. 3 is attached, and the joint sleeve 3 is prevented from coming off from the independent corrugated portion 1b of the end portion by the stopper 4.

The retaining member 4 is mounted over the end of the joint sleeve 3 and the independent corrugated portion 1b, and has a substantially C-shaped elasticity having a circumference longer than a half circumference of the joint sleeve 3. Is preferred. When the stopper 4 is formed in a C-shape, it is more preferable to use a closing member 4a that closes the C-shaped notch-shaped opening to form a ring as a whole. Further, in a state where the stopper 4 is attached, it is preferable that the outer diameter of the joint portion is equal to or less than the outer diameter of the peak portion 11 of the spiral wave attaching portion 1a.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a synthetic resin corrugated pipe and its joint structure according to the present invention will be described with reference to FIGS. Embodiment of Pipe FIG. 1 is a partial front view showing a synthetic resin corrugated pipe according to an embodiment of the present invention, and FIG. 2 is a partially enlarged cross-sectional view of a part of the synthetic resin corrugated pipe of FIG. The synthetic resin corrugated tube 1 has a spiral wave corrugated portion 1a of a predetermined length in which a groove 10 and a peak 11 are spirally continuous on the outer periphery, and an independent groove 12 perpendicular to the tube axis on the outer periphery thereof. Independent corrugated portions 1b of a predetermined length in which the peak portions 13 are alternately formed are formed alternately along the length direction. The independent corrugated portion 1b is preferably designed so as to be located at both ends of the corrugated tube 1 made of synthetic resin.
The material of the tube 1 is polyethylene, vinyl chloride, polypropylene, or other thermoplastic synthetic resin, and a lubricant or other various additives can be added to the thermoplastic synthetic resin.

The corrugated tube 1 made of synthetic resin is long and has an outer diameter r1 formed by the outer periphery of each peak 13 in the independent corrugated portion 1b.
Is formed to be smaller than the outer diameter R1 formed by the outer periphery of the peak portion 10 in the spiral wave attaching portion 1a. In this embodiment, as shown in FIG. 2, the inner diameter R2 of the groove 10 of the spiral corrugated portion 1a and the inner diameter r2 of the groove 12 of the independent corrugated portion 1b are substantially the same, and the independent corrugated portion 1b Is less than or equal to about の of the height of the ridge 10 in the circumferential direction of the spiral waved portion 1a in the circumferential direction.

When the corrugated tube 1 made of synthetic resin is long as described above, it is distributed and stored in a state of being wound around a reel or a drum (not shown).
The center part is cut and shortened. The length of each spiral corrugated portion 1a is 4000-7000 mm, and the length of each independent corrugated portion 1b is 200-500 mm. Each spiral wave part 1
The ratio of the length a to each independent corrugated portion 1b is 4000/500.
If it is designed to be less than or equal to, mechanical performance such as compressive strength and elongation of the synthetic resin corrugated pipe 1 is reduced, and the above-mentioned ratio becomes 7
If it is designed to be 000/200 or more, the portion of the independent corrugated portion 1b is cut, and when it is shortened and used, the length cannot be shortened sufficiently, which is inconvenient.

Embodiment of Pipe Joint Structure FIG. 3 is a side view of a stopper which is attached to a joint between pipes, and FIG. 4 is a partial sectional view showing a joint structure between pipes.
As described above, the synthetic resin corrugated tube 1 having the independent corrugated portion 1b at the end, or the synthetic resin corrugated tube 1 obtained by cutting the central portion of the independent corrugated portion 1b, is obtained in the following manner. Be linked. First, a ring-shaped packing 2 made of rubber or soft synthetic resin is fitted into at least one groove 12 of the independent corrugated portion 1b at the end of each of the corrugated tubes 1 made of synthetic resin. Then
The synthetic resin corrugated tube 1 is inserted into a synthetic resin pipe-shaped joint sleeve 3 so as to cover a part of the independent corrugated portion 1b at the end and to tightly inscribe the packing 2. 1
Insert the ends of each other. Further, the joint sleeve 3 has a circumference longer than a half circumference of the joint sleeve 3 so as to straddle both ends of the joint sleeve 3 and another part of the independent corrugated portion 1b at the end of the pipes 1 and 1. And a substantially C-shaped synthetic resin stopper member 4 having elasticity is attached.
Of each of the tubes 1 and 1 is prevented from coming off.

In the above joint structure, the outer diameter R of the stopper 4
Are formed so as to be equal to or less than the outer diameter of the peak portion 11 in the spiral wave attaching portion 1a of each tube 1. In this embodiment,
As shown in FIGS. 3 and 4, the stopper 4 is formed so as to have an outer circumference of almost two thirds of the outer circumference of the joint sleeve 3, and an independent corrugated portion 1 b of the outer circumference of the joint sleeve 3 and the end thereof. It is attached while being spread so as to straddle the outer periphery of the device, and has elasticity enough to return to its original shape when external force is removed.
The joint sleeve 3 is provided on one peripheral edge of the stopper 4.
An inner collar-shaped locking projection 40 is formed on the flange-shaped projection 30 formed at the end of the tube 1 to be locked in the longitudinal direction of the tube 1, and the other peripheral edge is provided with an independent wave. An inner flange-shaped fitting projection 41 is formed to be inserted and locked into the groove 12 of the portion 1b.
The concave portion 30 of the joint sleeve 3 and the peak portion 1 of the pipe 1
3 is caught between the locking projection 40 and the fitting projection 41 of the stopper 4 so that the joint sleeve 3 is prevented from coming off from the independent corrugated portion 1b at the end of each of the tubes 1, 1. It has become. In this embodiment, the fitting projection 41 is formed so as to be continuous in the circumferential direction of the stopper 4, but may be formed intermittently. Further, one of the protrusion 30 on the joint sleeve 3 side and the locking protrusion 40 on the stopper 4 may be formed so as to be discontinuous and not continuous in the circumferential direction.

According to the synthetic resin corrugated tube 1 of the above embodiment, first, the outer diameter r1 formed by the outer circumference of each peak 13 in the independent corrugated portion 1b is the peak of the spiral corrugated portion 1a. Since the outer circumference of the portion 10 is configured to be smaller than the outer diameter R1 formed, the synthetic resin corrugated pipes 1 are separately placed at different times into a single installation space such as a large pipeline (not shown). At the time of drawing, the synthetic resin corrugated pipe 1 is smoothly drawn into the installation space without the grooves 12 and the peaks 13 in the independent corrugated portions 1b of the synthetic resin corrugated pipes 1 and 1 being engaged with each other. be able to. In addition, the groove 10 of the spiral wave attaching part 1a
And the ridges 11 are spirally continuous and do not mesh with each other during retraction. Secondly, since the independent corrugated portion 1b is shorter than the spiral corrugated portion 1a, when the tube 1 is drawn into the large pipeline, the existing corrugated portion 1 and the independent corrugated portion 1b of the tube 1 to be retracted are mutually connected. Contact can be more reliably prevented, and the workability of pull-in is good. Third, the spiral wave attaching part 1
Since the inner diameter R2 of the groove portion 10a is the same as the inner diameter r2 of the groove portion 12 of the independent corrugated portion 1b, a cable or the like can be smoothly drawn inside.

According to the joint structure of the synthetic resin corrugated pipe of the embodiment, first, the puncture 2 is fitted into the independent groove 12 at the end of the pipe 1 and the independent corrugated section 1b is formed. By fitting a part of the joint sleeve 3 so that the packing 2 is intimately inscribed in a part of the pipe, and attaching a retaining member 4 so as to straddle the joint sleeve 3 and each pipe 1, the pipe 1 The two can be connected very simply, quickly and in a watertight manner. Second, in a state where the tubes 1 are connected to each other, the outer diameters R of the stoppers 4 are formed so as to be equal to or less than the outer diameters of the ridges 11 of the spiral wave attaching portions 1a of the respective tubes 1, so that the stoppers 4 are connected. When the pipe 1 is drawn into a single laying space such as a large pipe line, the pipe 1 can be drawn smoothly and space-efficiently without being caught by a joint portion of the existing pipe 1.

Other Embodiment FIG. 5 is a partial front view of a synthetic resin corrugated pipe according to another embodiment. The corrugated pipe 1 of this embodiment has a total length of 4000 to 70
100 mm to 250 mm length at both ends of the 00 mm spiral wave attaching portion 1 a
An independent corrugated portion 1b of about mm is formed. Since the synthetic resin corrugated tube 1 has independent corrugated portions 1b at both ends, the tubes 1 can be connected to each other without cutting, which is convenient. In addition, since the whole is short, it is convenient for construction work in urban areas. Other configurations, operations, and effects of the corrugated pipe of this embodiment are the same as those of the corrugated pipe of the first embodiment, and thus description thereof will be omitted.

FIG. 6 is a front view showing another example of the stopper 4 at the joint portion, and FIG. 7 is a side view of the stopper 4 of FIG. The retaining member 4 is provided with an arc-shaped closing member 4a having the same sectional shape as the retaining member 4 so as to close the C-shaped opening of the retaining member 4. When the closing member 4a is attached to the joint portion of the pipe 1 in a similar state so as to form a ring together with the stopper 4,
Engaging portions 43 are formed to be engaged with engaging portions 42 formed at both ends of the stopper 4.
3 are locked so as to be integrated into a ring shape. When the stopper 4 having the closing member 4a is used,
The tensile strength of the joint is greatly improved.

[0022]

According to the corrugated pipe made of synthetic resin according to the first aspect of the present invention, the corrugated pipe has a spiral corrugated portion 1a and an independent corrugated portion 1b, and each peak in the independent corrugated portion 1b. Since the outer diameter r1 formed by the outer circumference of the portion 13 is smaller than the outer diameter R1 formed by the outer circumference of the peak portion 10 in the spiral wave-fitted portion 1a, the pipes 1 can be easily connected to each other in a watertight manner, and a large pipe When the synthetic resin corrugated pipes 1 are separately drawn into the single installation space such as at different times, the grooves 12 and the ridges 13 in the independent corrugated portions 1b of the synthetic resin corrugated pipes 1 and 1 are separated. And the synthetic resin corrugated tube 1 can be smoothly drawn into the installation space.

According to the corrugated tube made of synthetic resin according to the second aspect of the present invention, a synthetic resin corrugated tube having independent corrugated portions 1b shorter than the spiral corrugated portion 1a at both ends of the spiral corrugated portion 1a. The corrugated tube 1 is very convenient to use by connecting the tubes 1 without cutting.

According to the corrugated pipe made of synthetic resin according to the third aspect of the present invention, the inner diameter R of the groove portion 10 of the spiral corrugated portion 1a.
2 and the inside diameter r2 of the groove portion 12 of the independent corrugated portion 1b are the same diameter, so that a cable or the like can be smoothly drawn in when it is drawn inside.

According to the joint structure of the synthetic resin corrugated pipe according to the fourth aspect of the present invention, the puncture 2 is fitted into the independent grooves 12 at the ends of the pipes 1 and the independent corrugated sections 1b. By fitting a part of the joint sleeve 3 so that the packing 2 is inscribed in a part of each other in close contact, and fixing the joint sleeve 3 and the pipe 1 with a stopper 4, the pipes 1 can be extremely easily connected to each other. The connection can be made quickly and with water tightness.
Further, in the connection state of the pipes 1, the pipes 1 can be connected to each other so that the outer diameter of the joint portion does not greatly differ from the maximum outer diameter portion of each pipe 1. When the pipe 1 is drawn into a single installation space, the joints between the pipes 1 are not caught and can be drawn smoothly and efficiently.

[Brief description of the drawings]

FIG. 1 is a partial front view showing a synthetic resin corrugated pipe of one embodiment according to the present invention.

FIG. 2 is a partially enlarged sectional view of a part a in the synthetic resin corrugated pipe of FIG.

FIG. 3 is a side view of a stopper that is attached to a joint between pipes.

FIG. 4 is a partial cross-sectional view showing a joint structure of a synthetic resin corrugated pipe according to one embodiment of the present invention.

FIG. 5 is a partial front view of a synthetic resin corrugated pipe of another embodiment.

FIG. 6 is a front view showing another example of the stopper 4 in the joint portion.

FIG. 7 is a side view of the stopper 4 of FIG.

FIG. 8 is a partial sectional view showing an example of a conventional synthetic resin corrugated pipe and its joint structure.

FIG. 9 is a partial front view showing another example of a conventional synthetic resin corrugated tube.

FIG. 10 is a partial front view showing still another example of the conventional synthetic resin corrugated pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin corrugated tube 1a Spiral corrugated portion 1b Independent corrugated portion 10, 12 Groove portion 11, 13 Crest portion 2 Packing 3 Joint sleeve 30 Convex portion 4 Retaining stopper 4a Closing member 40 Locking convex portion 41 Fitting convex portion 42 Engaging part 43 Locking part 5, 6, 7 Corrugated pipe 7a Spiral corrugated part 7b Independent corrugated part 50, 60, 70, 72 Groove part 51, 61, 71, 73 Crest part 52 Seal sleeve 53 Putty 54 Band Or tape

Claims (4)

[Claims] 1. A spiral wave part 1a of a predetermined length in which a groove 10 and a peak 11 are spirally formed on the outer periphery, and an independent groove 12 and a peak 13 which are substantially perpendicular to the tube axis on the outer periphery. Are alternately formed along the length direction with independent corrugated portions 1b of a predetermined length, and the outer diameter r1 formed by the outer periphery of each peak 13 in the independent corrugated portion 1b is A corrugated tube made of synthetic resin, wherein the outer diameter of the ridge portion 10 in the spiral corrugated portion 1a is smaller than an outer diameter R1 formed by the corrugated portion. 2. The synthetic resin corrugated pipe according to claim 1, wherein each of the spiral corrugated sections 1a has an independent corrugated section 1b shorter than the spiral corrugated section 1a. 3. An inner diameter R of the groove 10 of the spiral wave portion 1a.
3. The synthetic resin corrugated pipe according to claim 1, wherein an inner diameter r <b> 2 of the groove 2 of the independent corrugated part 1 b is the same as an inner diameter r <b> 2 of the groove 12. 4. The synthetic resin corrugated tube 1 according to claim 1, wherein the independent corrugated portion 1b is located at an end of the at least one groove portion 12 present in the independent corrugated portion 1b.
The joint sleeve 3 is attached to the independent waved portion 1b at the end so that the packing 2 is inscribed in a tight contact state. The joint portion structure of a synthetic resin corrugated pipe, wherein the end portion is prevented from coming off from the independent corrugated portion 1b.