JP3337991B2 - Corrugated pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated pipe joint used for connecting a corrugated pipe as an underground cable conduit to an underground box such as a handhole or a manhole. .

[0002]

2. Description of the Related Art Conventionally, when an end of a corrugated pipe is connected to an underground box such as a handhole, a hole is formed in a wall of the underground box at a construction site, and a corrugated pipe is formed in the hole. Has been widely adopted in which the end around the corrugated pipe is inserted and the gap around the corrugated pipe is filled with mortar or the like. However, in this method, there is a problem that the work of connecting the corrugated pipe to the underground box is not only troublesome and time-consuming, but also that the construction period becomes long because soil and sand cannot be backfilled until the mortar is solidified.

Recently, a first cylinder fixed to a hole in an underground box and a second cylinder which can be inserted and connected to the first cylinder while being attached to an end of a corrugated pipe. A pipe joint comprising a body has been proposed (Japanese Patent Application Laid-Open No. Hei 10-24353). If this pipe joint is used, if the first cylinder is fixed to the underground box in advance, the second cylinder is attached to the end of the corrugated pipe, and the second cylinder is connected to the first cylinder. All that is required is to plug in and connect to the cylinder, which not only simplifies the on-site connection work, but also shortens the construction period.

[0004]

However, in the pipe joints proposed in the prior art, when the second cylinder is attached to the end of the spiral tube, the spiral waveform portion of the second cylinder is provided with a spiral wave. Since the structure is screw-connected to the pipe, a spiral gap is easily formed between the inner peripheral surface of the second cylindrical body and the outer peripheral surface of the spiral wave tube, and it is difficult to make the structure watertight. Therefore, water easily penetrates into the corrugated pipe and the underground box.

As a method of fixing the first cylindrical body to the underground box, the first cylindrical body is inserted into a hole formed in a wall of the ready-made underground box and fixed with a mortar or the like. There are two types: "retrofit type" and "embedded type" in which the first cylinder is set in a molding frame and concrete is poured when molding an underground box. The first cylinder cannot be used for both because the length cannot be adjusted. In particular, in the case of the "embedded type", it is difficult to cope with it because it is necessary to adjust the length of the first cylindrical body to the thickness of the wall of the underground box.

In view of the above problems, a first object of the present invention is to provide a pipe joint for a corrugated pipe in which water tightness between the second cylindrical body and the corrugated pipe is ensured. .

A second object of the present invention is to provide a pipe fitting for a corrugated pipe which can adjust the length of the first cylindrical body and can cope with both the "embedded type" and the "retrofit type". is there.

[0008]

In order to achieve the above object, a corrugated pipe joint according to the present invention comprises a first cylindrical body fixed to a mating member to which a corrugated pipe is to be connected, and a first cylindrical body fixed to the first cylindrical body. A second cylinder inserted and connected to the cylinder, and a stopper for attaching a rear end of the second cylinder to an end of the corrugated tube; An end of a corrugated pipe having a packing attached to the outer periphery thereof, a seal tube portion which is inserted into close contact with the packing, and has a flange portion on the outer periphery of the seal tube portion; Can be mounted so as to straddle the flange and the corrugated pipe in a state where the end of the corrugated pipe is inserted into the seal cylinder, and engage with the flange on the inner peripheral surface. A ridge that falls into the joint portion and a valley portion of the corrugated pipe is formed. ).

With such a configuration, the end of the corrugated pipe having the packing mounted on the outer periphery can be inserted into the seal cylinder of the second cylinder, so that watertightness can be ensured. In particular, in the case of this configuration, since the corrugated pipe is retained by the retaining member outside the seal cylinder portion of the second cylinder, even if the corrugated pipe is pulled, the corrugated pipe is located in the seal cylinder portion. Since no pulling force is applied to the end of the corrugated pipe, and thus the end of the corrugated pipe is not stretched, the tightness of the packing is not loosened, and the watertightness is ensured.

[0010] In the joint for a corrugated pipe according to the present invention, when the corrugated pipe is a spiral corrugated pipe, the stopper is formed by a combination of two half-collars having the same shape, and the half-collar is provided in the axial direction. The inner peripheral surface of both ends has an engaging portion with the flange portion of the second cylindrical body, and the half-split collar is combined into two cylindrical shapes on the inner peripheral surface between the two engaging portions. It has a spiral ridge that sometimes becomes helical, and has a male mold on one side of a symmetrical position just on the middle just between the two engagement portions on the end faces at both ends in the circumferential direction. It is preferable that the coupling portion has a female coupling portion on the other side (claim 2).

With such a configuration, the second cylindrical body is
The two half collars can be easily attached to the end of the tube with a spiral wave, and since the two half collars can have the same shape, the cost of the mold can be reduced to one and the cost is low.

Further, in the pipe joint according to the present invention, when the corrugated pipe is an annular corrugated pipe, the stopper has a circumferential length larger than a half circumference of the flange of the second cylindrical body and the circular corrugated pipe. Even if it is an arc type, it has elasticity enough to return to the original shape when external force is removed even if the distance between both ends in the circumferential direction is widened to the space where the flange and the tube with annular waves enter by applying external force. It is preferable (claim 3). With such a configuration, the second cylindrical body can be easily attached to the end of the ring-shaped pipe with the arc-shaped stopper.

When an arc-type stopper is used, it is preferable to combine an arc-retaining auxiliary member for connecting both ends of the stopper in the circumferential direction. This makes it possible to remarkably increase the pull-out strength of the tube with an annular wave.

Further, the first tubular body constituting the pipe joint of the present invention comprises an intermediate tubular portion having a spiral groove on the inner peripheral surface, and a second tubular body integrally formed at one end of the intermediate tubular portion. A cylindrical portion having a spiral ridge that can be screwed into the helical groove on the outer peripheral surface with a smaller diameter than the intermediate cylindrical portion formed integrally with the other end side of the intermediate cylindrical portion, The intermediate cylinder portion and the small cylinder portion are cut off, the intermediate cylinder portion is cut to a required length if necessary, and the small cylinder portion is screwed and connected to the intermediate cylinder portion so that the overall length can be adjusted. Is preferable (claim 5). By using such a first cylinder, it is possible to flexibly cope with whether the first cylinder is attached to the underground buried box whether it is an “embedded type” or a “retrofit type”. Generally, the first cylinder is formed by a hollow molding method. In the case of hollow molding, in order to form a spiral groove (concave portion) on the inner peripheral surface, a spiral ridge (convex portion) is formed on the corresponding portion on the outer peripheral surface. That is, a spiral waveform (rib) is formed on the entire cylindrical portion. In this case, there is an advantage that the strength against compression and flattening at the time of placing concrete and after burying in the ground is increased as compared with a simple cylindrical form.

It is preferable that the first cylinder has a bell mouth formed integrally with an end of the small cylinder. With this configuration, when the cable is drawn into the corrugated pipe, the cable can be smoothly drawn without damaging the cable.

Further, in the pipe joint of the present invention, an annular concave portion is formed on the inner peripheral surface of the connecting cylindrical portion of the first cylindrical body, and a retaining ring is housed in the annular concave portion. Has a discontinuous portion in a part thereof, and can be elastically expanded in diameter.In a state where the diameter is not expanded, the inner peripheral portion has a size protruding inward from an edge of the annular concave portion, and the second cylinder On the outer peripheral surface of the insertion portion of the body into the first cylindrical body, a convex portion is formed, which passes while increasing the diameter of the stop ring and is caught by the stop ring by reducing the diameter of the stop ring after passing. It is preferable to adopt a configuration (claim 6). With such a configuration, the pull-out strength of the first cylinder and the second cylinder can be significantly increased. Note that the pull-out strength can be further improved by providing, at both ends in the circumferential direction of the retaining ring, engaging portions that are engaged with each other when the retaining ring is expanded beyond a predetermined diameter.

In the case where the insertion connection structure between the first cylinder and the second cylinder is as described above, a seal ring is attached to the outer peripheral surface of the second cylinder prior to the projection. It is preferable that the pressing surface of the seal ring is formed on an inner peripheral surface deeper than the annular concave portion of the connection cylindrical portion of the first cylindrical body (claim 7). With this configuration, even when the pipe is pulled, the seal portion is difficult to move, so that the watertightness of the insertion connection portion between the first cylinder and the second cylinder can be improved.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] FIGS. 1 to 9 show an embodiment of the present invention. In the figure, 1 is a tube with a spiral wave, 3 is a wall of a handhole to which the tube 1 with a spiral wave is to be connected, 5 is a first cylindrical body fixed to the wall 3 of the handhole, and 7 is a first cylinder at the tip end side. A second cylindrical body 9 to be inserted and connected to the cylindrical body 5 is a pair of half-split collars (retaining stoppers) for attaching the rear end of the second cylindrical body 7 to the end of the tube 1 with a spiral wave. It is. The first cylinder 5, the second cylinder 7, and the half collar 9 are made of a plastic molded body.

FIG. 1 shows a first cylindrical body 5 on a wall 3 of a handhole.
FIG. 2 shows a state before the second cylinder 7 is attached to the end of the spiral-wave tube 1 and the second cylinder 7 is inserted into the first cylinder 5 and connected. Indicates the state after the plug-in connection.

First, the structure of each part constituting the joint of this embodiment will be described. As shown in FIG. 3, the first cylinder 5 includes an intermediate cylinder 13 having a spiral groove 11 on an inner peripheral surface thereof, and a second cylinder integrally formed on one end of the intermediate cylinder 13. And a small cylindrical portion 17 integrally formed on the other end side of the intermediate cylindrical portion 13. Small cylinder 17 is an intermediate cylinder
A spiral ridge 19 having a diameter smaller than 13 and capable of being screwed into the spiral groove 11 of the intermediate cylindrical portion 13 is provided on the outer peripheral surface. As will be described later in a third embodiment, the first cylindrical body 5 separates the intermediate cylindrical portion 13 and the small cylindrical portion 17 and cuts the intermediate cylindrical portion 13 to a required length as necessary. The entire length can be adjusted by screwing and connecting the portion 17 to the intermediate cylindrical portion 13. Generally, the first cylinder 5 is formed by a hollow molding method. In the case of hollow molding, in order to form a spiral groove (recess) 11 on the inner peripheral surface, a spiral ridge (convex portion) is formed on the corresponding portion of the outer peripheral surface. That is, a spiral waveform (rib) is formed on the entire cylindrical portion. In this case, there is an advantage that the strength against compression and flattening at the time of placing concrete and after burying in the ground is increased as compared with a simple cylindrical form.

A bell mouth 21 is integrally formed at the end of the small cylindrical portion 17. In addition, an annular concave portion is formed on the inner peripheral surface of the connection cylindrical portion 15.
23 is formed, and a pressing surface 25 of an O-ring, which will be described later, is formed behind the annular concave portion 23. A retaining ring 27 as shown in FIG. 4 is housed in the annular recess 23 (see FIG. 1 for the housed state). The stop ring 27 has a discontinuous portion 29 at a part in the circumferential direction, and can be elastically expanded in diameter. Further, the retaining ring 27 has a protruding edge 31 on the inner periphery, and when the diameter is not expanded (free state), the protruding edge 31 is formed in the annular concave portion 23.
Is formed in such a size as to protrude inward from the edge of. The discontinuous portion 29 is wrapped in the circumferential direction, and a hook portion 33 is formed at the end of the wrap portion so as to be hooked to each other at intervals in the circumferential direction. The diameter limit of the retaining ring 27 is regulated by the hook 33. This is to increase the pull-out strength of the second cylinder 7.

Next, as shown in FIG. 5, the second cylinder 7 is
It has a structure in which an insertion portion 35 for inserting into the first cylindrical body 5 is provided on the distal end side, and a seal cylindrical portion 37 for inserting the end of the corrugated pipe 1 is provided on the rear end side. The inner surface of the seal tube portion 37 is formed smoothly, and has a shape without waves. A flange 39 is formed on the outer periphery of the end of the seal cylinder 37. In addition, the outer peripheral surface of the insertion portion 35 passes through the stop ring 27 in the connection cylinder portion 15 while being expanded in diameter when inserted into the first cylindrical body 5, and is stopped by the diameter reduction of the stop ring 27 after passing. Convex part 41 hooked on ring 27
Is formed. In the illustrated example, four protrusions 41 are formed at equal intervals in the circumferential direction, but the number of protrusions 41 is not limited. The protrusion 41 may be continuous in the circumferential direction.
Further, an annular groove 43 is formed on the outer peripheral surface of the insertion portion 35 beyond the convex portion 41, and an O-ring 45 as shown in FIG.
(Seal ring) is attached (see FIG. 1 for the attachment state).

A packing 47 as shown in FIG. 7 is attached to the outer periphery of the end of the spiral wave tube 1 inserted into the seal tube 37 of the second tube 7. The packing 47 has a helical ridge 49 formed on the inner peripheral surface thereof so as to be in close contact with the uneven surface on the outer periphery of the tube 1 with a spiral wave, and the outer diameter is smaller than the inner diameter of the seal cylindrical portion 37 of the second cylindrical body 7. It is formed slightly larger.

Next, as shown in FIG. 8, the half-split collar 9 has an engaging portion 51 with the flange 39 of the second cylindrical body 7 on the inner peripheral surface at both ends in the axial direction. On the inner peripheral surface between the two engaging portions 51, there is a spiral ridge 53 for a half circumference that falls into a valley on the outer peripheral surface of the corrugated tube 1. FIG. 8 (A) shows a case in which one spiral ridge 53 is constituted by a pair of triangular mountain-shaped ridges in order to prevent sink marks during molding. The shape is not limited to this, and may be trapezoidal, for example. As shown in FIG. 8A, the spiral ridge 53 is formed such that one end is located exactly in the middle between the two engaging portions 51 and the other end is located near one of the engaging portions 53. ing. When the two half-split collars 9 are combined in a cylindrical shape, each spiral ridge 53 forms one continuous spiral ridge. A male coupling part 55 is provided on one side of a symmetrical position at a position just midway between the two engaging parts 51, and a male coupling part 55 is provided on the end faces at both ends in the circumferential direction of the half-split collar 9, respectively. A female joint 57 is formed on the side. The male coupling portion 55 is large enough to be inserted into the female coupling portion 57, and has a claw portion which is caught at an end of the female coupling portion 57 by an edge thereof.
Has 59.

When the half collar 9 is structured as described above, it is possible to attach the second tubular body 7 to the end of the spiral wave tube 1 using two half collars 9 having the same shape. Become.

The above is the structure of each part constituting the joint of this embodiment. Next, a method for connecting a spiral wave tube to a handhole using this joint will be described. First, as shown in FIG. 1, the first cylinder 5 is fixed to the wall 3 of the handhole. This embodiment is a “retrofit type” in which the first cylindrical body 5 is inserted into a hole formed in the wall 3 of the handhole and fixed with mortar or the like.

On the other hand, a second cylindrical body 7 is attached to the end of the tube 1 with spiral waves. This operation is performed as shown in FIG. First, a packing 47 is attached to the end of the tube 1 with a spiral wave, and this part is inserted into the seal tube 37 of the second tube 7. Then, the packing 47 is pressed by the seal tube portion 47, and the space between the spiral wave tube 1 and the second tube 7 becomes a watertight structure. Next, the two half collars 9 are arranged so that the male coupling portion 55 of one half collar 9 and the female coupling portion 57 of the other half collar 9 face each other. The engaging portion 51 at one end of the collar 9 is connected to the flange 39 of the second cylindrical body 7.
, The two half collars 9 are pressed until the circumferential end faces abut against each other with the spiral ridge 53 on the inner peripheral surface aligned with the valley on the outer peripheral surface of the tube 1 with spiral waves.

Then, as shown in FIG. 1, the male coupling portion 55 penetrates the female coupling portion 57, the claw portion 59 of the male coupling portion 55 is hooked on the edge of the female coupling portion 57, and the two halves are split. The collar 9 is in the state of being connected. In this state, the engaging portions 51 of the two half collars 9 are engaged with the flange 39 of the second cylindrical body 7, and the spiral ridge 53 on the inner peripheral surface is formed on the outer peripheral surface of the spiral wave tube 1. Since it falls into the valley, the corrugated tube 1 cannot be pulled out of the second cylinder 7. Also, even if a tensile force is applied to the corrugated tube 1, the end of the corrugated tube 1 (the portion inserted into the seal tube portion 37).
Since no tensile force is applied to, the packing 47 is not loosened and the watertightness is not impaired. In this joint, since the half collar 9 is provided, the above operation can be performed with a light force.

After attaching the second cylinder 7 to the end of the tube 1 with spiral waves in this way, the tip of the second cylinder 7 is inserted into the first cylinder 5. Then, the retaining ring 27 in the first cylindrical body 5 is enlarged in diameter by the convex portion 41 of the second cylindrical body 7 and then reduced in diameter. As shown in FIG.
As a result, the second cylinder 7 cannot be pulled out of the first cylinder 5. Further, in this state, the O-ring 45 is pressed against the inner surface of the first cylindrical body 5, so that the water tightness between the first cylindrical body 5 and the second cylindrical body 7 is also ensured.

By using the joint of this embodiment, the spiral-wave tube 1 can be easily connected to the wall 3 of the handhole as described above.

[Embodiment 2] FIGS. 10 and 11 show a second embodiment of the present invention. FIGS. 10 and 11 correspond to FIGS. 1 and 2, respectively, in the first embodiment. In this embodiment, the same joint as that of the first embodiment is used, and a different point from the first embodiment is that an “embedded type” in which the entire length of the first cylindrical body 5 is embedded in the wall 3 of the handhole. It is. Such a handhole in which the first cylinder 5 is embedded in advance is manufactured by setting the first cylinder 5 in a mold for forming a handhole and pouring concrete. The other parts are the same as those of the first embodiment.

[Embodiment 3] FIGS. 12 and 13 show a third embodiment of the present invention. FIGS. 12 and 13 correspond to FIGS. 1 and 2 in the first embodiment, respectively. This embodiment is a case where the same joint as that of the first embodiment is used, and is applied to the “embedded type” as in the second embodiment. In the second embodiment, the thickness of the wall 3 of the handhole is equal to the length of the first cylindrical body 5, but in this embodiment, the thickness of the wall 3 of the handhole is the second embodiment.
It is a thinner case.

In such a case, the intermediate cylindrical portion 13 and the small cylindrical portion 15 of the first cylindrical body 5 shown in FIG.
Is cut into a required length, and the small cylindrical portion 15 is screwed and connected to the intermediate cylindrical portion 13, so that the length of the first cylindrical body 5 can be adjusted to the thickness of the wall 3 of the handhole. The first cylinder 5 can be embedded in the wall 3 of the handhole. The other parts are the same as in the first embodiment, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

As is apparent from Embodiments 2 and 3,
The corrugated pipe joint of the present invention is an "embedded type" and can flexibly cope with a case where the thickness of the wall of the handhole is different.

[Embodiment 4] FIGS. 14 to 16 show a fourth embodiment of the present invention. This embodiment is a case where the corrugated pipe is an annular corrugated pipe 61 in which each peak is independent. FIGS. 14 to 16 show only the structure of the portion where the second cylinder 7 is attached to the end of the tube 61 with an annular wave, and the other structures are the same as those of the first to third embodiments, and are not shown. The second cylinder 7 has a seal cylinder 37 on the rear end side and a flange 39 on the outer periphery of the end of the seal cylinder 37, as in the above embodiment. Further, it is the same as the above-described embodiment in that an end of an annular corrugated tube 61 having a packing 47 mounted on the outer periphery is inserted into the seal tube portion 37.

In this embodiment, in order to attach the second cylindrical body 7 to the end of the tube 61 with an annular wave, a stopper 63 which is simple in structure and usage is used. This stopper 63
Is an arc-shaped type having a circumference longer than a half circumference of the flange portion 39 of the second cylindrical body 7 and the annular wave tube 61, and is engaged with the flange portion 39 at one end in the axial direction as shown in FIG. Engagement part
65 is formed, and a ridge 67 is formed on the other end side so as to fall into a valley on the outer peripheral surface of the annular wave tube 61. Even if the stopper 63 is expanded by applying an external force to widen the interval between both ends in the circumferential direction to an interval into which the flange 39 and the annular tube 61 are inserted, the stopper 63 has elasticity enough to return to the original shape when the external force is removed. are doing. Such a stopper 63 can be manufactured by, for example, injection molding of ABS resin, polypropylene, or polyamide.

When the stopper 63 is disposed at a position as shown in FIG. 14 and is pushed in the direction of the arrow, the interval between both ends in the circumferential direction is pushed to the outer diameter of the flange 39 and the annular wave tube 61. After being spread, it is narrowed by elasticity.
A state in which more than half the circumference of the tube 39 and the annular wave tube 61 is held. In this state, the engagement portion 65 is caught by the flange portion 39, and the ridge 67 falls into the valley of the tube 61, so that the tube 61 cannot be pulled out of the second cylindrical body 7. By using the arc-shaped stopper 63 in this way, the second tubular body 7 can be easily attached to the end of the tube 61 with an annular wave.

The circumference of the stopper 63 is shown in FIG.
It is preferable that the central angle θ be 200 ° to 260 ° as shown in FIG. The retaining member 63 is FIG. 15 (A), the (B), the state where external force is not applied, the inner diameter 2R ₁ of the engaging portion 65, the outer diameter of the tubular sealing portion 37 of the second cylindrical body 7 It is preferable to form them so as to be slightly smaller than 2R ₂ . With this configuration, when the retaining member 63 is mounted on the outer periphery of the flange portion 39, the engaging portion 65 is in a state of tightening the seal tube portion 37, so that the mounting state is stable.

[Fifth Embodiment] FIGS. 17 and 18 show a fifth embodiment of the present invention. This embodiment is also the fourth embodiment.
This is the case where the corrugated tube is the annular corrugated tube 61 in the same manner as described above. FIG.
7 and FIG. 18 also show only the structure of the portion where the second cylindrical body 7 is attached to the end of the tube 61 with an annular wave, and other structures are the same as those of the first to third embodiments, and are not shown.

This embodiment is different from the fourth embodiment in that
This is the combination of the arc-resistant stopper 63 and the arc-resistant stopper 69 that connects both ends in the circumferential direction. The sub-arc type retaining aid 69 is a superior arc type retaining device.
Similarly to 63, an engaging portion 65 that engages with the flange portion 39 is formed on one end side in the axial direction, and a ridge 67 is formed on the other end side that falls into a valley on the outer peripheral surface of the tube with annular wave 61. I have.

Each of the retaining member 63 and the retaining auxiliary member 69 has a connecting portion with a counterpart at both ends in the circumferential direction. In this embodiment, both ends of the stopper 63 are used as connecting portions in FIG.
As shown in FIGS. 8 (A) and 8 (B), a T-shaped concave portion (a concave portion having a larger width at the back) 71 is formed, and at both ends of the retaining aid 69, as shown in FIGS. A T-shaped convex portion (a convex portion having a wider end) 73 is formed. The T-shaped projection 73 has a size that fits into the T-shaped recess 71.

When the T-shaped concave portion 71 and the T-shaped convex portion 73 are fitted to each other and both ends of the retaining member 63 are connected by the retaining auxiliary member 69,
As shown in FIG. 17, it becomes a ring and covers the entire circumference of the annular waved pipe 61 and the end (flange) of the seal tube 37. In this way, both ends of the retainer 63 are retained.
When connected by 69, both ends of the stopper 63 are difficult to open, so that the pull-out strength of the corrugated tube 61 can be greatly improved as compared with the fourth embodiment.

[Embodiment 6] The joint shown in FIG.
And the packing 47 shown in FIG.
Is used. The joint body 70 is provided with a seal cylinder 37 and a flange 39 similar to those of the joint shown in FIG. Further, a rib portion 71 is provided on the inner periphery of the center portion in the length direction of the joint body 70 so as to separate the left and right sides. In this example, the joint body 70 has a symmetrical shape, but one may have a different shape. In this joint, the spiral tube 1 with the spiral wave attached thereto is inserted into the seal tube 37 of the joint body 70 and the half-split collar 9 is attached, so that the tube 1 with the spiral wave is tightly and watertightly. There is an advantage that it can be easily connected.

[0044]

As described above, according to the present invention, a corrugated pipe can be easily connected to an underground box such as a handhole or a manhole, and a corrugated pipe and an end thereof can be connected. Watertightness between the second cylindrical body to be attached can be ensured. In addition, by making the length of the first cylinder adjustable, not only "retrofit type",
There is an advantage that it is possible to flexibly cope with the case where the thickness of the wall is different in the “embedded type”.

[Brief description of the drawings]

FIG. 1 is a half-cut side view of a first embodiment of a corrugated pipe joint according to the present invention, showing a state before insertion connection.

FIG. 2 is a half-cut side view showing a state after the plug connection.

FIG. 3 is a half-cut side view of a first cylindrical body constituting the joint of FIG. 1;

FIG. 4 shows a stop ring housed in the first cylinder.
(A) is a rear view, (B) is a sectional view taken along line BB of (A),
(C) is a side view, and (D) is a sectional view taken along line DD of (C).

FIG. 5 is a half-cut side view of a second cylindrical body constituting the joint of FIG. 1;

FIG. 6 (A) of an O-ring mounted on a second cylinder.
Is a sectional view, and (B) is a front view.

7A is a half-cut side view and FIG. 7B is a front view of a packing for a tube with a spiral wave, which constitutes the joint of FIG.

FIG. 8 shows a half-collar of the joint of FIG.
(A) is a plan view, (B) is a front view, and (C) is a side view.

FIG. 9 is a side view showing a process of attaching the second tubular body of the joint of FIG. 1 to the end of the tube with a spiral wave.

FIG. 10 is a half-cut side view of a second embodiment of the corrugated pipe joint according to the present invention, showing a state before insertion connection.

FIG. 11 is a half-cut side view showing the state after the plug connection.

FIG. 12 is a half-cut side view of a third embodiment of the corrugated pipe joint according to the present invention, showing a state before insertion connection.

FIG. 13 is a half-cut side view showing a state after the plug connection.

FIG. 14 is a side view showing a process of attaching the second cylindrical body to the end of the annular corrugated pipe in the fourth embodiment of the corrugated pipe joint according to the present invention.

15 (A) is a half-cut front view of the stopper, and FIG. 15 (B) is a half-cut front view of the vicinity of the flange of the second cylindrical body.

FIG. 16 is a side view showing a state where the second tubular body of the joint shown in FIG. 14 is attached to an end of a tube with an annular wave.

FIG. 17 is a side view showing a fifth embodiment of the corrugated pipe joint according to the present invention, in which a second cylindrical body is attached to an end of the annular corrugated pipe.

18 (A) is a half-cut front view of a retaining member, FIG. 18 (B) is a side view of the same, FIG. 17 (C) is a half-cut front view of a retaining aid, and FIG. Is the same side view.

FIG. 19 is a half-cut side view showing the joint of the sixth embodiment.

[Explanation of symbols]

 1: Tube with spiral wave 3: Handhole wall 5: First cylinder 7: Second cylinder 9: Half collar (stopper) 11: Spiral groove 13: Intermediate cylinder 15: Connection cylinder 17: Small cylinder part 19: Spiral ridge 21: Bell mouth 23: Annular concave part 25: Seal ring pressing surface 27: Retaining ring 29: Discontinuous part 31: Projection 35: Insertion part 37: Seal cylinder part 39: Flange part 41: Convex part 45: O-ring (seal ring) 47: Packing 51: Engagement part 53: Spiral ridge 55: Male type connection part 57: Female type connection part 61: Tube with annular wave 63: Stopper 65: Engagement 67: Protrusion 69: Retaining aid

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 33/00 F16L 33/28 H02G 3/06 H02G 9/06

Claims (7)

(57) [Claims] 1. A first cylindrical body (5) fixed to a counterpart member (3) to which a corrugated pipe (1, 61) is to be connected, and a distal end side of the first cylindrical body (5) is inserted and connected to the first cylindrical body (5). And a stopper (9, 63) for attaching a rear end of the second cylinder (7) to an end of the corrugated pipe (1). The second cylindrical body (7) has a sealing cylindrical part (7) in which the end of a corrugated pipe (1, 61) having a packing (47) mounted on the outer periphery is inserted at the rear end side and is in close contact with the packing (47). 37) and a flange (39) on the outer periphery of the seal cylinder (37). The stopper (9, 63) is provided with a corrugated pipe on the seal cylinder (37). With the end of (1) inserted, insert the collar (3
9) and the corrugated pipe (1, 61) so that it can be attached to the pipe, and the inner peripheral surface is engaged with the flange (39) by the engaging portions (51, 65) and the corrugated pipe. (1) A corrugated pipe joint, in which ridges (53, 67) which fall into a valley portion are formed. 2. The corrugated tube is a spiral corrugated tube (1),
The retaining member is composed of a combination of two half collars (9) having the same shape, and the half collar (9) has a flange portion (39) of the second cylindrical body on inner circumferential surfaces at both ends in the axial direction. And a spiral which is formed into a spiral when the two half-split collars (9) are combined in a cylindrical shape on the inner peripheral surface between the two engaging portions (51). It has a ridge (53), and a male coupling is provided on one end of a symmetrical position on the end face of each of both ends in the circumferential direction at a position symmetrical with the middle just between the two engaging portions (51). The joint according to claim 1, characterized in that the part (55) has a female coupling part (57) on the other side. 3. The corrugated pipe is an annular corrugated pipe (61), and the stopper (63) is larger than a half circumference of the second cylindrical body flange (39) and the annular corrugated pipe (61). An arcuate type having a perimeter, the gap between both ends in the circumferential direction by applying an external force to the flange (39)
The joint for a corrugated pipe according to claim 1, wherein the joint has a resilience enough to return to its original shape when an external force is removed, even if the pipe is extended to an interval where the annular corrugated pipe (61) enters. 4. The retaining device according to claim 3, wherein the retaining device is a superior arc type retaining device, and the auxiliary device is a sub-arc type retaining auxiliary device for connecting both ends in the circumferential direction. Corrugated pipe fittings. 5. The first cylindrical body (5) includes an intermediate cylindrical portion (13) having a spiral groove (11) on an inner peripheral surface, and the intermediate cylindrical portion (13).
A connecting cylinder portion (15) integrally formed on one end side of the second cylindrical body with the second cylindrical body, and a smaller diameter than the intermediate cylindrical portion (13) integrally formed on the other end side of the intermediate cylindrical portion (13). And a small cylindrical portion (17) having a spiral ridge (19) which can be screwed into the spiral groove (11) on the outer peripheral surface, and the intermediate cylindrical portion (13) and the small cylindrical portion (17) are separated. The corrugated pipe joint according to any one of claims 1 to 4, wherein the entire length is adjustable by screwing and connecting the cylindrical portion (17) to the intermediate cylindrical portion (13). 6. An annular recess (23) is formed on the inner peripheral surface of the connecting tubular portion (15) of the first tubular body (5), and the annular recess (23) is formed.
The stop ring (27) is accommodated in the stop ring (27). The stop ring (27) has a discontinuous portion (29) in a part of the circumferential direction and can be elastically expanded. An inner peripheral portion (31) has a size protruding inward from an edge of the annular concave portion (23), and an outer peripheral surface of an insertion portion (35) of the second cylindrical body (7) into the first cylindrical body. A convex portion (41) is formed to pass through the stop ring (27) while expanding the diameter of the stop ring (27) and to be caught by the stop ring (27) by reducing the diameter of the stop ring (27) after passing therethrough. The joint for a corrugated pipe according to any one of claims 1 to 5, wherein: 7. A seal ring (45) is attached to the outer peripheral surface of the second cylinder (7) beyond the projection (41), and the connection cylinder (5) of the first cylinder (5). The joint for a corrugated pipe according to claim 6, wherein a pressing surface (25) of the seal ring (45) is formed on an inner peripheral surface deeper than the annular concave portion (23).