JP2001177964A - Device for joining buried pipe to connection, and junction structure using this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for joining a buried pipe into connection, which can surely and firmly attach a buried pipe 10 into a junction hole A via a joint pipe 2 with high sealing property, even if the diameter of the buried pipe and the diameter of the junction hole A are slightly different, merely by using one kind of joint pipe 2, without having to prepare plural kinds of joint pipes, when attaching the buried pipe 10 anew into the junction hole A such as an existing hand hole H, thereby enabling cast of work execution to be reduced, and moreover can surely and firmly join the buried pipe 10 into a hand hole H or the like via the joint pipe 2 without it coming off, even if it is subjected to large load from the outside, and a junction structure using this. SOLUTION: This device is equipped with a joint pipe 2, which consists of elastic material to joint a buried pipe 10, inserted into the junction hole A of a connection H, and an expansion band 3 which expands the joint pipe 2, while pressing it from the inside thereby pressing the outside against the junction hole A so as to fix it, being provided inside it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining apparatus for joining a buried pipe to a connecting portion such as a handhole or a manhole, and a joining structure using the same.

[0002]

2. Description of the Related Art Conventionally, as a joining structure for joining a buried pipe to a connecting portion such as a handhole or a manhole, there is, for example, Japanese Patent Application Laid-Open No. H11-182765. The gist of the invention is to insert a joint pipe into the joint hole of the connection part and to join the buried pipe through the joint pipe. Conventionally, there is also known a device in which an adhesive is loaded between the joint hole and the joint pipe.

[0003]

However, the above-mentioned structure has poor versatility. In other words, when replacing a buried pipe in a joint hole such as an existing handhole, the diameter of the joint hole often differs for each handhole. For this reason, when replacing a buried pipe in each handhole, it is necessary to prepare in advance a plurality of types of joint pipes corresponding to the size of the joint hole. However, preparing a plurality of types of joint pipes causes an increase in construction cost. Moreover, as described above, it is difficult to obtain sufficient joint strength only by inserting the joint pipe into the joint hole of the connection portion and joining the buried pipe through the joint pipe. Further, even if an adhesive is loaded between the joint hole and the joint pipe, when a large load is applied from the outside due to an earthquake or the like,
Joint pipes or buried pipes may come off. For these reasons, in recent years, there has been a demand for a joining apparatus and a joining structure that can join joint pipes and buried pipes firmly to handholes, etc., in which construction costs are low, and they do not come off even under a large load. I have.

Accordingly, an object of the present invention is to replace a buried pipe in a joint hole such as an existing handhole by using only one kind of joint pipe without preparing a plurality of kinds of joint pipes. Even if the diameter of the joint hole is slightly different from the diameter of the joint hole, the buried pipe can be securely and firmly attached to the joint hole with high sealability through the joint pipe, and the construction cost can be reduced. An object of the present invention is to provide a joining device and a joining structure that can securely and firmly join a buried pipe to a handhole or the like via a joint pipe without being detached even when receiving a load.

[0005]

According to a first aspect of the present invention, there is provided a joining apparatus according to the first aspect of the present invention, which is inserted into a joining hole of a connecting portion such as a handhole and elastically joins a buried pipe. A joint pipe made of a material, and an expansion band provided on the inner surface of the joint pipe for expanding the diameter of the joint pipe while pressing the joint pipe from the inner face, and pressing and fixing the outer face of the joint pipe to the joint hole are provided.

When the joint pipe is connected to the joint hole of the connecting portion by the above-described joining device, first, the joint pipe is inserted into the joint hole, and the diameter of the expansion band inserted therein is expanded. Then, the joint pipe made of the elastic material is expanded in diameter from the inner surface toward the outer surface by the expansion band, and the outer surface side thereof is pressed against the joining hole and closely pressed. By doing so, the joint pipe is firmly fixed to the joint hole with high sealing properties. In addition, since the joint pipe has elasticity, even if the diameter of the joint pipe is slightly smaller than the diameter of the joint hole, one kind of joint pipe is used, and the joint pipe is elastically deformed with an expansion band from the inner surface side. By expanding the diameter of the joint pipe, the joint pipe can be securely and firmly fixed to the joint hole. In other words, instead of preparing a plurality of types of joint pipes corresponding to the size of the joint hole as in the related art, using only one type of joint pipe,
This can be securely and firmly fixed to the joining holes having different diameters. For this reason, the construction cost is reduced. The buried pipe is joined to the joint pipe fixed to the joint hole in this manner. At this time, since the joint pipe has elasticity, that is, flexibility, it is possible to cope with the case where the buried pipe is joined to the inclined pipe in an inclined manner. Due to the expansion and contraction or bending of the joint, reliable joining of the joint pipe to the joining hole is compensated.

According to a second aspect of the present invention, there is provided a joining apparatus comprising: a joint pipe which is inserted into a joint hole of a connecting portion and is made of an elastic material for joining a buried pipe; An expansion band that presses against the inner surface to expand the diameter, and presses and fixes the outer surface to the joint hole, and is provided on the outer peripheral surface of the joint tube located outside the joint hole, and this joint tube, And a tightening band for tightening and fixing the buried pipe inserted therein.

When the joint pipe is connected to the joint hole of the connecting portion by the above-described joining apparatus of the second invention, the joint pipe is fixed to the joint hole by the extension band in the same manner as in the first invention. Thereafter, the joint pipe located outside the joint hole and the buried pipe inserted into the joint pipe are tightened by the tightening band. In this way, the joint pipe is securely and firmly fixed to the joint hole with high sealing properties,
At the same time, the buried pipe is securely and firmly fixed to the joint pipe with high sealing properties. For this reason, even if a large load is applied from the outside due to an earthquake or the like, the joint pipe or the buried pipe does not easily come off.

The extension band used in the first and second inventions is a band-shaped plate member having cam surfaces formed at both longitudinal end surfaces, a holding frame into which both ends are inserted, and a holding frame. And a cam member rotatably attached to the cam surface and abutting on the cam surface, and the plate member is expanded while pressing the cam surface by the rotation of the cam member. According to this extension band, the joint pipe can be securely and firmly fixed to the joint hole by a simple operation of rotating the cam body.
For this reason, it becomes convenient when performing the replacement work of the joint pipe at the construction site, and the construction period can be shortened. Moreover, since the expansion diameter of the plate member is adjusted by changing the rotation angle of the cam body, it is possible to fix a plurality of joint pipes having different diameters to the joint holes of various sizes with one type of expansion band. In other words, the extension band becomes versatile and contributes to a reduction in construction cost.

It is preferable that the cam body is provided with an operation section that enables the cam body to be rotated. With this configuration, the rotation of the cam body can be easily performed by operating the operation unit with a tool or the like. Therefore, even at a construction site or the like, the operation of expanding the expansion band by rotating the cam body can be easily performed.

A bonding structure according to a third aspect of the present invention uses the bonding apparatus according to any one of the first to fourth aspects,
The joint pipe is fixed to the joint hole of the connection part by the extension band, and a fitting portion into the joint hole of the joint pipe,
A sealing material is interposed between the buried pipes inserted into the joint pipe, and a water-stop packing is interposed between the joint pipe and the buried pipe located outside the joint hole, so that the outer periphery of this portion is The surface is tightened with a tightening band.

According to the above-described joint structure, the sealing material is interposed between the fitting portion of the joint tube fixed to the joint hole by the extension band and the buried tube inserted into the joint tube. Watertight packing is interposed between the joint pipe located outside the joint hole and the buried pipe, and the outer peripheral surface of the watertight packing is fastened by a tightening band. High sealing effect can be obtained by water packing.

It is preferable that the buried pipe has a projection on the outer periphery, and the projection holds the sealing material and the waterproof packing. With this configuration, the sealing material and the water-stop packing are securely held on the outer peripheral portion of the buried pipe by the projections, so that the sealing effect by the seal material and the water-stop packing is reliably exhibited.

Further, ribs extending in the circumferential direction are provided on an outer peripheral surface of a portion of the joint pipe to be inserted into the joint hole and an inner peripheral surface of the joint pipe located outside the joint hole. Therefore, it is preferable to enhance the sealing property and the joining strength between the joint pipe and the joint hole and between the joint pipe and the buried pipe. With this configuration, when the joint pipe is expanded in diameter by the expansion band and fixed to the joint hole, the rib provided on the outer peripheral surface of the joint portion of the joint pipe inserted into the joint hole is joined while buckling and deforming. Press tightly against the hole. Further, when fixing the buried pipe by tightening the outer peripheral surface of the joint pipe located outside the joint hole with a tightening band, the rib formed on the inner peripheral surface of the joint pipe buckles and deforms the buried pipe or the buried pipe. Press tightly against the waterproof packing provided on the outer periphery. For this reason, the sealing property and joint strength between the joint pipe and the joint hole and between the joint pipe and the buried pipe are further enhanced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of construction of a buried pipe in a handhole. In the figure, the joining device 1 of the present invention is attached to each of the joining holes A provided in the two hand holes H, and the buried pipe 10 is connected between the hand holes H via these.

As shown in FIG. 2, the joining apparatus 1 includes a joint pipe 2 made of an elastic material such as rubber or synthetic resin, for example, EPDM (ethylene propylene diene rubber).
The joint pipe 2 has a large-diameter portion 21 inserted into the joint hole A of the hand hole H, and a connecting portion 2 extending radially inward while bending from an end of the large-diameter portion 21.
2 and a small-diameter portion 23 connected to the connecting portion 22 and located on the outer side of the joint hole A are formed integrally and continuously. By providing the connecting portion 22 between the large-diameter portion 21 and the small-diameter portion 23 in this manner, the large-diameter portion 21 and the small-diameter portion 2 are provided.
Since the flexibility between the buried pipe 3 and the buried pipe 10 can be increased, the connection between the buried pipe 10 and the joint pipe 2 can be made convenient.

On the outer periphery of the large-diameter portion 21 and on the connecting portion 22 side, a convex portion 24 is provided in the circumferential direction to be a hit when the large-diameter portion 21 is inserted into the joint hole A. In addition, on the outer peripheral surface of the large-diameter portion 21 and the inner peripheral surface of the small-diameter portion 23, the sealing performance and the joint strength between the large-diameter portion 21 and the joint hole A and between the small-diameter portion 23 and the buried pipe 10 are improved. For this purpose, a large number of ribs 25 and 26 are formed continuously in the circumferential direction. further,
The inner peripheral surface of the large-diameter portion 21 is provided with two convex portions 27 projecting inward at predetermined intervals to prevent an extension band described later from being detached.
In addition, a convex portion 28 protruding outward is provided on an outer peripheral surface of the small-diameter portion 23 at an end opposite to the connecting portion 22 in order to prevent a fastening band described later from being detached. It is provided in the circumferential direction.

The joint pipe 2 is provided on the inner surface side of the large-diameter portion 21 to expand the diameter while pressing the large-diameter portion 21 from the inner surface side. And an extension band 3 for fixing.

As shown in FIGS. 3 to 5, the extended band 3 has a cam surface 3 having an arc shape on each end face in the longitudinal direction.
A band-shaped plate member 31 made of stainless steel or the like on which 0 and 30 are formed, a rectangular metal holding frame 32 into which both ends of the plate member 31 are inserted, and each of the cams rotatably attached to the holding frame 32. And a cam body 33 having an elliptical shape in contact with the surface 30.
The plate member 31 is expanded in diameter while pressing 0.

The holding frame 32 is formed into a substantially C-shape in a side view by a substrate 32a and two side plates 32b, 32b which are provided on both sides of the substrate 32a and which are bent at predetermined intervals so as to be opposed to each other. I do. And these substrates 32
Then, both ends of the plate member 31 are inserted between a and each side plate 32b, and the entire plate member 31 is inserted into the large-diameter portion 21 in a circular loop shape. Further, the substrate 32a
The cam 33 is rotatably mounted via a shaft 34, and an operation hole 36 is formed on the outer surface side of the cam 33 at a center position, which is rotatable by a tool 35 such as a wrench as an operation unit.

Further, each of the cam surfaces 30 has a cam body 3
Arc-shaped locking groove 3 in which the long elliptical convex portion 3 is locked
When the cam member 33 is rotated to expand the plate member 31 and the convex portion of the cam member 33 is locked in the engagement groove 30a, the rotation of the cam member 33 is prevented. This prevents the plate member 31 from being reliably kept in the expanded state. Each of the cam surfaces 30 may be formed with a plurality of locking grooves 30a. In this way, when adjusting the expansion diameter of the expansion band 3 while changing the rotation angle of the cam body 33 according to the size of the joint hole A of the hand hole H or the size of the joint pipe 2, etc. By locking the convex portion to any one of the locking grooves 30a, the rotation of the cam body 33 when the expansion diameter of the expansion band 3 is adjusted is prevented, and the plate member 31 is expanded by a predetermined amount. It can be kept in the diameter state. Thus, the joint pipe 2 can be reliably fixed to the joint hole A even if the size of the joint hole A of the hand hole H and the joint pipe 2 are slightly different by using only one extension band 3. For this reason, the extension band 3 becomes versatile and contributes to a reduction in construction cost.

Next, the joining structure of the buried pipe 10 to the handhole H using the joining apparatus 1 will be described. When connecting the joint pipe 2 to the joint hole A of the hand hole H, the large-diameter portion 21 of the joint pipe 2 is inserted into the joint hole A from the outside of the hand hole H as shown in FIG. At this time, a convex portion 24 is provided on the outer periphery of the large-diameter portion 21 on the connecting portion 22 side, and the convex portion 24 comes into contact with the bonding hole A. Easy insertion. Thereafter, each convex portion 2 is formed on the inner peripheral surface of the large-diameter portion 21.
The cam 33 of the extension band 3 inserted between the members 7 is rotated from the state shown in FIG.

Then, as shown in FIG. 4, each of the cam surfaces 30 formed on both end surfaces of the plate member 31 is expanded in diameter while being pressed by the long elliptical convex portions of the cam body 33, and finally the cam members 33 are formed. Engagement groove 3 in which convex portion of body 33 is formed on each cam surface 30
0a, and is maintained in a predetermined expanded state. At this time, since the joint pipe 2 is formed of an elastic material, the diameter of the large-diameter portion 21 of the joint pipe 2 is increased from the inner surface to the outer surface by the extension band 3, and the outer surface of the large-diameter portion 21 is in close contact with the joint hole A. By being pressed, the joint pipe 2
Is securely and firmly fixed to the joining hole A with high sealing properties. At this time, since a large number of ribs 25 are formed on the outer peripheral surface of the large-diameter portion 21, when the joint pipe 2 is expanded by the extension band 3 and fixed to the joint hole A, the ribs 25 are seated. It is pressed against the joint hole A closely while bending and deforming. For this reason, the sealing property and the joint strength between the joint pipe 2 and the joint hole A are further enhanced.

The joint pipe 2 has elasticity, and the expansion band 3 can adjust the expansion diameter.
A plurality of types of joint pipes 2 having different diameters can be fixed to the joint holes A of various sizes by one expansion band 3. That is, even when the diameter of the joint pipe 2 is slightly smaller than the diameter of the joint hole A, one joint pipe 2 and one extension band 3 are used, and the extension diameter thereof is adjusted. Large diameter portion 21 of the joint pipe 2 with the diameter expansion
The joint pipe 2 can be securely fixed to the joint hole A by elastically deforming a part of the joint pipe 2. For this reason, there is no need to prepare a plurality of types of joint pipes corresponding to the sizes of the joint holes as in the related art, and the construction cost is reduced. In addition, since the joint pipe 2 has elasticity, that is, flexibility, it is possible to cope with the case where the buried pipe 10 is joined to the joint pipe 2 in an inclined manner, and even when a large load is externally applied due to an earthquake or the like. When the joint pipe 2 expands and contracts or curves, the joint pipe 2
Is securely bonded to the bonding hole A.

After the joint pipe 2 is fixed to the joint hole A as described above, a ribbed pipe 10 having a projection 11 on the outer periphery, for example, is inserted into the joint pipe 2 as a buried pipe. Then, a sealing material 4 such as a PE (polyethylene) sponge is interposed between the large-diameter portion 21 of the joint pipe 2 and the ribbed pipe 10, and the small-diameter portion 23 of the joint pipe 2 and the buried pipe 10 A waterproof packing 5 such as EPDM (ethylene propylene diene rubber) is interposed between the connecting portion 22 and the convex portion 2 on the outer peripheral surface of the small-diameter portion 23.
The plurality of tightening bands 6 provided between the tightening bands 8 are tightened. In this case, a high sealing effect can be obtained by the sealing material 4 and the water-stop packing 5. Moreover, the small diameter portion 23
Since many ribs 26 are formed on the inner peripheral surface of
When the small-diameter portion 23 is tightened by the tightening band 6, the rib 26 comes into close contact with the outer peripheral surface of the buried pipe 10 and the water-stop packing 5 provided on the outer surface side thereof while buckling and deforming. For this reason, the small-diameter portion 23 of the joint pipe 2 and the buried pipe 1
The sealing property and bonding strength between 0 are further enhanced.

In the embodiment of FIG. 7, a spiral pipe 10 is used as a buried pipe, and the other structure is the same as that of FIG. As described above, in the case where a pipe with a rib or a spiral pipe is used as the buried pipe, the sealing material 4 and the water-stop packing 5 are securely held on the outer circumference of the buried pipe 10 by the projections 11 provided on the outer circumference of the pipe. Therefore, the sealing effect of the sealing material 4 and the water-stop packing 5 is reliably exerted. Moreover, according to the above, since the pipe itself exhibits good flexibility, the joint pipe 2 is formed of an elastic material, and thus, when the buried pipe 10 is joined in an inclined state. Not only is it convenient, but also when the joint pipe 2 and the buried pipe 10 are elastically deformed when a large load is applied from the outside, they can be reliably joined.

In the above embodiment, the handhole H has been described. However, the joining apparatus and the joining structure of the present invention can be applied to joining the buried pipe 10 to a manhole or other connecting portions.

[0028]

As described above, according to the present invention, when replacing a buried pipe in a joint hole such as an existing handhole, one type of joint pipe can be prepared without preparing a plurality of types of joint pipes.
Even if the diameter of this joint and the diameter of the joint hole are slightly different by simply using a type of joint pipe, the buried pipe can be securely and firmly attached to the joint hole with high sealing properties through the joint pipe, The cost can be reduced, and the buried pipe can be securely and firmly joined to the handhole or the like via the joint pipe without coming off even if a large load is applied from the outside.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of construction of a buried pipe in a handhole.

FIG. 2 is a partially cutaway side view of the joining device according to the present invention.

FIG. 3 is a partially cutaway front view of the extension band.

FIG. 4 is a partially cutaway front view showing an operation state of the extension band.

FIG. 5 is a cross-sectional view of the extension band as seen from a direction XX in FIG. 3;

FIG. 6 is a cross-sectional view showing one embodiment of a bonding structure according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the joint structure.

[Explanation of symbols]

 2 Joint pipe 25, 26 Rib 3 Expansion band 30 Cam surface 31 Plate member 32 Holding frame 33 Cam body 36 Operation part (operation hole) 4 Seal material 5 Waterproof packing 6 Tightening band 10 Buried pipe 11 Projection H Connection part (hand Hall) A Joint hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masanori Yamada 528-1, Takaoka, Takino-cho, Kato-gun, Hyogo Prefecture Inside Higashi Hari Trading Co., Ltd. (72) Inventor Yoshiharu Hamazuki 132 Minamikubo, Kochi City, Kochi Prefecture Hirojin Trading Co., Ltd. In-house (72) Inventor Satsuki Ito 1353-1-108 Fuku term (reference) 2D047 BA27 3H013 AA03 5G369 AA05 AA19 BA04 BA06 DC04 DC09 DC20 DD02

Claims (7)

[Claims] 1. A joining apparatus for joining a buried pipe to a connection part such as a handhole or a manhole, comprising: a joint pipe made of an elastic material which is inserted into a connection hole of the connection part and joins the buried pipe; An apparatus for joining a buried pipe to a connecting portion, comprising: an extension band provided on an inner face side, the joint pipe being expanded while pressing the joint pipe from the inner face side, and pressing the outer face against a joining hole to be fixed. 2. A joint device for joining a buried pipe to a connection part such as a handhole or a manhole, wherein the joint pipe is inserted into a joint hole of the connection part and is made of an elastic material for joining the buried pipe. An expansion band that is provided on the inner surface, expands the diameter of the joint pipe while pressing it from the inner surface, and presses and fixes the outer surface of the joint pipe to the joint hole, and is provided on the outer peripheral surface of the joint pipe located outside the joint hole A joining device for connecting a buried pipe to a connecting portion comprising a joint band for tightening and fixing the joint pipe and a buried pipe inserted therein. 3. The expansion band according to claim 1, wherein the extension band is a band-shaped plate member having cam surfaces formed on both end surfaces in a length direction, a holding frame into which both ends are inserted, and the holding frame. A cam member rotatably attached to the cam surface, the cam member abutting against the cam surface, and the buried pipe is joined to a connection portion that expands the plate member while pressing the cam surface by rotation of the cam body. . 4. The apparatus according to claim 3, wherein the cam body is provided with an operating part capable of rotating the cam body. 5. A joint device according to claim 1, wherein the joint tube is fixed to a joint hole of a connecting portion by an extension band, and a joint portion of the joint tube is inserted into the joint hole. A sealing material is interposed between the buried pipe inserted into the joint pipe, and a water-stop packing is interposed between the joint pipe and the buried pipe located outside the joint hole. Connection structure of a buried pipe to a connection part whose surface is fastened by a fastening band. 6. A joint structure of a buried pipe according to claim 5, wherein the buried pipe has a projection on an outer periphery thereof, and the projection uses the projection to connect to the connecting portion holding the sealing material and the water-stop packing. 7. The rib extending in the circumferential direction according to claim 5, wherein an outer peripheral surface of a portion of the joint pipe to be inserted into a joint hole and an inner peripheral surface of the joint pipe located outside the joint hole are provided. The joint structure of the buried pipe to the connection part, which enhances the sealing performance and the joint strength between the joint pipe and the joint hole and the joint pipe and the buried pipe by these ribs.