JP3500912B2 - Connection fitting - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting joint for connecting a special portion such as a handhole or a manhole used for an electric wire common groove to a buried underground pipe.

[0002]

2. Description of the Related Art The electric wire common groove is a special section (connection section, branch section) which is installed to realize underground embedding of electric cables such as electric power cables, communication cables and cables for road managers. ), Pipelines and ground equipment. The feature is the conventional cab (cable box)
Compared to the method, the aim is to make the interval of burying the pipeline narrow and compact, to bury it in a shallow layer, or to lower the cost (about 1/3 of the cab).

The connection joint for connecting the special portion and the underground buried pipe will be described. For example, the joint shown in FIG. 9 is general. The connecting joint 10 includes a first tubular portion 10A having a substantially trumpet-shaped portion at one end,
The other end has a second tubular portion 10B having a diameter larger than that of the first tubular portion 10A and for movably fitting an underground buried pipe therein. Connection joint 10 configured in this way
In the case of fixing to the special portion 1, first, the special joint 1 is inserted into the through hole 1A from the tip end of the connecting joint 10 on the side of the first cylinder portion 10A and positioned. After this, the mortar 7 is placed in the gap between the outer surface of the first tubular portion 10A and the peripheral surface of the through hole 1A of the special portion 1.
And the mortar 7 is solidified, whereby the fixing of the connecting joint 10 is completed. Then, the underground pipe 2 is fitted in the second tubular portion 10B of the connecting joint 10.

The connecting joint 10 is inserted into the through hole 1A of the special portion 1 and a part of the first tubular portion 10A and the second tubular portion 10A.
Since the cylindrical portion 10B largely projects to the outside of the special portion 1, the connecting joint 10 gradually inclines downward toward the outside until the mortar 7 solidifies due to the weight of the protruding portion. I was sometimes in a state. Further, if there is a protruding portion as described above, another object or a person's hand unexpectedly comes into contact with the protruding portion of the connecting joint 10 for which the installation work has been completed, while the other connecting joint 10 is being installed. I got hit,
The attitude of the connecting joint 10 may be changed significantly before the mortar 7 solidifies. In order to eliminate this, the joint 10 for connection is formed until the mortar 7 is solidified.
Not only has to be provided with some means for holding the horizontal position, but also the means has to be released after the mortar 7 has solidified, and the installation work of the connecting joint 10 is troublesome and cumbersome. Met.

Further, as described above, in addition to the case where the connecting joint 10 is inserted and fixed in the through hole 1A of the special portion 1 which is installed in advance, the connecting joint 10 is used when the special portion 1 is manufactured.
May be integrated with the special unit 1. In this case,
As shown in FIG. 0, the joint 10 for connection is connected to the bolt 13 and the nut 14 in a form made up of a bottom plate 11 and four side plates 12 for surrounding four peripheral edges (only two are shown in the figure).
Fixed by. In this state, the mortar 7 is poured to a set thickness, and after the poured mortar 7 is solidified, the mold is removed so that the side surface portion 1a of the special portion 1 having the connection joint 10 can be formed. There is. Since the connecting joint 10 is lighter than the mortar 7, the connecting joint 10 must be fixed to the bottom plate 11 when the mortar 7 is being poured.
0 will rise, and the joint 10 for connection will be attached to the bottom plate 11
Need to be fixed to. Then, as shown in FIG. 11, two side surface portions 1a formed as described above are arranged at both ends, and a pair of U-shaped intermediate portions 1b and 1b are provided between the side surface portions 1a and 1a. The special portions 1 are arranged by connecting them with bolts or the like.

As described above, when the special portion 1 is manufactured, not only the side surface portion 1a but also the intermediate portion 1b must be formed, which is disadvantageous in terms of manufacturing, and the manufactured side surface portion 1a and the intermediate portion 1b. There is a disadvantage in the assembling surface due to an increase in the assembling man-hours that need to be integrated, and a lot of time was spent in manufacturing the special portion 1. Moreover, each time the side surface 1a is formed, not only the connecting joint 10 has to be fixed to the bottom plate 11, but also the bolts 13 and the nuts 14 have to be removed after the mortar has solidified, which is more troublesome. It was When the side surface 1a is made, the connecting joint 10
Can be made only in a state in which it projects upward and the surface is in the horizontal direction, so not only does it require a lot of work space for creation, but also the finished side surface portion 1a is changed to a vertical posture and the intermediate portion is changed. Must be assembled to 1b. As described above, moving the heavy side surface portion 1a requires a great deal of labor and imposes a heavy burden on the operator. Further, when the finished special portion 1 is transported or installed, there is a possibility that another object or the like may come into contact with the connecting joint 10 projecting from the side surface portion 1a to the outside to damage or damage the outer surface.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is to solve the problems that the connection joint can be easily and quickly fixed to the special portion and the connection is made until the mortar is solidified. It is possible to surely avoid changing the posture of the joint for abutment, and to make it possible to manufacture the special portion including the joint for connection in a short time and without much labor. , The point is to prevent the joint for connection from being scratched or damaged when the finished special part is transported or installed.

[0008]

In order to solve the above-mentioned problems, the present invention is a connecting joint for connecting an underground buried pipe to a special portion such as a handhole or manhole used for an electric wire common groove or the like. A bell in which the inner surface of the tip portion on the inner side of the special portion is formed in a substantially trumpet shape with an outward expansion, and the dimension in the pipe axis direction fixed through the special portion in the pipe axis direction is substantially equal to the thickness of the special portion. A connecting joint comprising a mouse and a duct sleeve, one end of which is movably connected to the underground buried pipe in the direction of the pipe axis thereof, and the other end of which is internally fittable and fixable to the bell mouth. Therefore, when fixing the joint for connection to a special part,
After inserting the bell mouth into the through hole formed in the special portion, the mortar is filled between the outer surface of the bell mouth and the inner surface of the through hole to fix the bell mouth to the special portion. In this way, when the mortar is filled, the bell mouth does not largely project outside the special portion, and the posture of the bell mouth with respect to the through hole is not changed. Then, after the filled mortar is solidified and the bell mouth is fixed to the special portion, the duct sleeve is fitted in and fixed to the bell mouth, and the fixing of the connecting joint to the special portion is completed.
Further, since the bell mouth has a size substantially equal to the thickness of the special portion, for example, the mold is composed of an outer frame, an inner frame and a bottom frame, and mortar is poured into the mold. When manufacturing the special part, after fixing the bell mouth between the outer frame and the inner frame, mortar can be poured and the special part 1 consisting of four side surfaces and the bottom surface can be manufactured in one process. The Bellmouth can be equipped at the same time. And when connecting the underground pipe to the special part,
Since it is sufficient to fit the duct sleeve inside the bell mouth and connect the underground pipe to the duct sleeve, when transporting or installing the special part equipped with the bell mouth, let alone the bell mouth from the special part. Since there is nothing that protrudes to the outside of the special portion, no other object will come into contact with the bell mouth or the duct sleeve.

By providing a plurality of protrusions on the outer surface of the bell mouth and by arranging the plurality of protrusions at a predetermined distance in the circumferential direction, when the protrusions on the outer surface fix the through hole to the mortar through the mortar. Not only does it make it difficult to change the position of the bell mouth with respect to the through hole by increasing the contact area, but also when stacking a large number of bell mouths or when installing a large number of bell mouths in a special part, the outer surface of the adjacent bell mouth It is possible to shift the positions so that the projections of do not overlap each other.

By constructing the bell mouth so that the outer diameter of the bell mouth becomes the same in the tube axis direction, not only is it easy to stack, for example, when a large number of bell mouths are bundled and transported, but the outer surface is exposed to the outside. There is an advantage that it is easy to avoid that the protruding portion of the bell mouth configured so as to project is abutted during transportation.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In FIG. 1, a plurality of (two in the figure) underground pipes 2 are provided in a special portion 1 such as a manhole or a handhole which is installed to collectively arrange electric wires in the ground. A cross-section is shown connected via a connecting joint 3.

The connecting joint 3 has a bell mouth 4 penetratingly installed in the special portion 1 and a base end portion 4B of the bell mouth 4.
And a duct sleeve 5 fixed at one end with an adhesive (using a solvent, a two-liquid mixture, a one-liquid curing type, etc.) and the other end of the duct sleeve 5 with the underground buried pipe 2 It is connected by being internally fitted while allowing its movement in the longitudinal direction. Reference numeral 6 shown in the figure is a rubber ring for increasing the airtightness by eliminating a gap between the inner surface of the duct sleeve 5 and the outer surface of the underground buried pipe 2, and a protruding portion 5C protruding outward from the duct sleeve 5. By inserting into the recess 5D formed on the inner side of the duct sleeve 5
The rubber ring 6 is prevented from moving when moving. Besides fixing the bell mouth 4 and the duct sleeve 5 with an adhesive, they may be fixed by various methods such as locking and screwing. In the case of locking and screwing, the bell mouth 4 The sealing member is interposed between the duct sleeve 5 and the duct sleeve 5.

The bell mouth 4 is originally used to prevent the cable from being damaged when the cable is pulled in. As shown in FIGS. 1 and 2, the bell mouth 4 is used.
The inner surface 4A of the inner end of the special portion 1 is formed into a substantially trumpet shape in a side view, which is outwardly curved toward the front end, and
The bell mouth 4 fixed through the special portion 1 has a dimension in the tube axis direction equal to the thickness of the special portion 1, and the base end portion 4B of the bell mouth 4 excluding the inner surface 4A of the tip portion is It is formed in a straight line. The outer diameter of the bell mouth 4 is configured to have the same diameter in the tube axis direction, and the four protrusions 4E ... Are provided on the outer surface 4D of the bell mouth 4 at predetermined intervals in the circumferential direction, that is, as shown in FIG. The projections 4E are provided so as to be located at 90-degree intervals in a front view. Therefore, the bell mouth 4 does not protrude from the special portion 1, and as shown in FIG. 4, for example, four bell mouths 4 are provided in the rectangular through hole 1A formed in the special portion 1.
When installing ..., the protrusions 4 of the bell mouths 4 and 4 adjacent to each other
It is possible to prevent the E and 4E from overlapping each other, and it is possible to increase the contact area with the mortar 7 by these protrusions 4E. It is preferable that the bell-mouth 4 has a dimension in the tube axis direction equal to the thickness of the special portion 1 and is smaller than the thickness of the special portion 1, but slightly larger than the thickness of the special portion 1. You may comprise. A step portion 4F is provided at the end of the inner surface 4A of the bell mouth 4 on the side where the duct sleeve 5 is connected, for controlling the depth of the duct sleeve 5 entering the bell mouth 4. As the material of the bell mouth 4 and the duct sleeve 5, various materials such as metal can be used other than synthetic resin. If it is made of synthetic resin, the protrusion 4
Since E ... can be easily integrally formed in the process of manufacturing the bell mouth 4, the outer surface 4D of the bell mouth 4 can be formed in an uneven shape instead of the protrusions 4E.
In the case of metal or the like, the separately formed protrusions 4E are attached to the outer surface 4D of the bell mouth 4. The protrusion 4
The shape of E ... is not limited to the shape shown in the figure. As shown in FIG. 2, the outer surface 4D of the bell mouth 4 may be sanded, or the outer surface 4D of the bell mouth 4 may be processed to have irregularities, which is not shown in the figure, so that the mortar 7 can be prevented from slipping. There is an advantage that the bell mouth 4 after being filled with the mortar 7 can be more surely prevented from changing its posture with respect to the through hole 1A of the special portion 1.

The duct sleeve 5 has a tip portion 5A which is fitted and fixed in the bell mouth 4 and a tip portion 5A.
The base end portion 5B has a diameter larger than that of A and is located on the opposite side of the tip end portion 5A so that the underground buried pipe 2 can be fitted therein. The size and shape of the duct sleeve 5 in the tube axis direction are not limited to those shown in the drawings.

The case where the underground buried pipe 2 is connected to the special portion 1 via the connecting joint 3 will be described. In FIG. 1, first, the special portion 1 is formed in the through hole 1A formed in the special portion 1 as described above. After the bell mouth 4 is inserted and positioned from the inside of 1, the bell mouth 4 is fixed to the through hole 1A by the mortar 7. The duct sleeve 5 is fitted in the base end portion 4B of the bell mouth 4 fixed by the mortar 7 being solidified and fixed by an adhesive, and the underground buried pipe 2 is fixed to the base end portion 5B of the duct sleeve 5. It fits inside. The connection order of the bell mouth 4, the duct sleeve 5, and the underground buried pipe 2 is not limited to this. Also, mortar 7
Before inserting the bell mouth 4 into the through hole 1A, the through hole 1A
It may be applied to.

As described above, by configuring the bell mouth 4 in the tube axis direction to have the same dimension as the thickness of the special portion 1, the bell mouth 4 is set to the special portion 1 when the special portion 1 is manufactured. Can be prepared. More specifically, as shown in FIG. 5, four outer frames 8A ... And a rectangular inner frame 8B.
And a bottom frame 8C, a mold 8 is provided, and the mortar 7 is poured into the mold 8 to manufacture the special portion 1. The thickness of the special portion 1 and the dimension of the bell mouth 4 in the tube axis direction Are the same, the outer frames 8A, 8 located on the both sides are
A specific number of bell mouths 4 ... Are fixed between A and the inner frames 8B, 8B facing each other by a clamping force between the frames or by an adhesive or the like, and then, as shown in FIG. By casting mortar into the special part 1,
The bell mouth 4 ... Can be provided at the same time when the special portion 1 is manufactured. After the special section 1 is manufactured, the mold 8 is removed. The specific structure of the mold 8 is not limited to the illustrated structure.

5 and 6 show the case where the dimension of the bell mouth 4 in the tube axis direction is equal to the thickness of the special portion 1, but in FIGS. 7 and 8, the dimension of the bell mouth 4 in the tube axis direction is The case where the thickness is smaller than the thickness of the special portion 1 is shown. In Figure 7,
A magnet 9A is fixed to a set position on the outer surface of the inner frame 8B with an adhesive or the like, and is fitted to one end of a metal positioning jig 9B and the bell mouth 4 which are fitted to the magnet 9A and fixed by magnetic force. The elastic body 9C is provided. The diameter of the elastic body 9C is increased toward the terminal end side in the insertion direction, and the connecting force between the elastic body 9C and the bell mouth 4 is changed by the amount of pushing the elastic body 9C into one end of the bell mouth 4. . Therefore, one end of the bell mouth 4 is brought into contact with the outer surface of the inner frame 8B so that the magnet 9A is located inside the bell mouth 4, and in this state, the positioning jig is inserted from the opening of the other end of the bell mouth 4. 9B is inserted, and the recess 9b of the positioning jig 9B is fitted into the magnet 9A. At this time, the recess 9b of the positioning jig 9B can be easily fitted to the magnet 9A by the magnetic force of the magnet 9A, and the bell mouth 4 can be positioned by the magnetic force after the fitting through the positioning jig 9B. it can. Next, the elastic body 9C is inserted and fixed from the opening of the other end of the bell mouth 4 described above so as to be fitted and fixed together, and then the outer frame 8A is pressed against the elastic body 9C so that the bell mouth 4 becomes the outer frame 8A. It can be fixed to the inner frame 8B by the restoring force of the elastic body 9C. Then, in this state, the mortar is poured as described above, and after the mortar is solidified, the outer frame 8A and the inner frame 8 with the magnet 9A are attached.
B, the elastic body 9C, and the positioning jig 9B are to be removed. After installing the special portion 1 manufactured in this way, the underground buried pipe 2 is connected to the special portion 1, but the number of underground buried pipes 2 connected is less than the number of bellmouths 4, When there is an extra bell mouth 4 that has been left over, if the elastic body 9C is inserted into the extra bell mouth 4 to plug it, sand does not enter and no special plug member is required. There is an advantage that can be.

In FIG. 8, instead of the elastic body 9C, a pipe 9D movably fitted in the bell mouth 4 and a coil spring for urging the pipe 9D to move outwardly of the bell mouth 4 are provided. 9E and 9E. In the case of using the coil spring 9E as described above, the insertion depth of the pipe 9D into the bell mouth 4 can be easily changed as compared with the case of pressing the elastic body 9C from the opening at the other end of the bell mouth 4. There is an advantage that can be done. Also in this case, after the special portion 1 is manufactured, the outer frame 8A, the inner frame 8B with the magnet 9A, the pipe 9
D, the coil spring 9E will be removed.

[0019]

According to the first aspect of the invention, the bell mouth is largely projected to the outside of the special portion by fixing the bell mouth to the special portion, the dimension of which in the tube axial direction is substantially equal to the thickness of the special portion. Since it does not, or does not project to the outside at all, until the filled mortar solidifies, due to the weight of the projecting part as in the past or to the projecting part By the contact, the posture of the bell mouth with respect to the through hole is not changed, and the conventionally required posture maintaining means for the bell mouth is not required, and the posture maintenance for the bell mouth is then performed after the mortar solidifies. It also becomes unnecessary to cancel the means. Then, the filled mortar is solidified, and after the bell mouth is fixed to the special portion, since the duct sleeve is internally fitted and fixed to the bell mouth, the fixing to the special portion of the connection joint is completed,
It is possible to easily and quickly fix the connecting joint to the special portion, and it is possible to reliably prevent the posture of the connecting joint from being unexpectedly changed before the mortar solidifies. Also, the connecting joint is divided into a bell mouth and a duct sleeve, and the bell mouth is formed to have a dimension substantially equal to the thickness of the special portion. In the above, since the bell mouth can be provided in the special portion, it is possible to eliminate the conventional work of connecting the heavy side portion having the connecting joint and the intermediate portion while aligning them.
Therefore, it is possible to create a special portion including a joint for connection in a short time without requiring a great deal of labor, and at the time of carrying or installing the finished special portion, a duct sleeve connected to the underground pipe. Since there is no need to fix the bell mouth to the bell mouth, it is possible to avoid damaging or damaging the duct sleeve or the bell mouth. Also, the protrusions provided on the outer surface allow the
Increase the contact area to the mortar when fixing via
The shape of the bell mouth against the through hole
Not only is it difficult to change tides, but a large number of bellmouths
In case of stacking or stacking a large number of bell mouths in a special part
If the protrusions on the outer surface of the adjacent bellmouth overlap,
The position can be shifted so that they do not fit, and the construction surface
Is advantageous in.

According to claim 2, like claim 1,
Use a bell mouth whose dimension in the tube axis direction is approximately equal to the thickness of the special part.
By using a configuration that is fixed to a special part, the bell mouth
Does not significantly project outside the special section, or
The filled mortar is
The weight of the protruding part as in the past until it solidifies
By contacting other parts or people's hands, etc.
The attitude of the bell mouth with respect to the through hole is changed.
There is no need to maintain the position of the bell mouth
Steps are no longer needed, and the mortar solidifies accordingly
It is no longer necessary to release the posture maintaining means for bellmouth.
It Then, the filled mortar solidifies and bellmouth
After it is fixed to the special part, the duct sleeve is
And fixed to the special part of the joint for connection.
It is easy to fix the joint for connection to the special part because of the structure
Can be done quickly and the mortar solidifies
The posture of the connecting joint may be changed unexpectedly during
It can be avoided without fail. Also, as in claim 1,
The joint for connection is separated from the bell mouth and the duct sleeve.
This Bell Mouth has dimensions that are similar to the thickness of the special part.
Since it is configured to have the same dimensions, the special part
In the process of creating
Since it can be done, it is equipped with a connecting joint as in the past
While aligning the heavy side parts and the middle part,
The subsequent work can be eliminated. Therefore, a short time
Equipped with a connecting joint without much labor
A special part can be created and completed
When transporting or installing special parts, contact the underground pipe
It is necessary to fix the following duct sleeve to the bell mouth.
No need to scratch duct sleeves or bellmouths
It is possible to avoid the damage. Also bell
By configuring the outer diameter of the mouse to have the same diameter in the tube axis direction
For example, when stacking and transporting many bellmouths,
Not only is it easy to stack, but the outer surface is designed to project to the outside.
Hold the formed bell mouth protrusion during transportation
There is an advantage that it is easy to avoid such things, and it is advantageous in terms of handling
You can

[0021]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which an underground pipe is connected to a special portion via a connecting joint.

FIG. 2 is an exploded perspective view of a joint for connection.

[Fig. 3] Front view of bell mouth

FIG. 4 is a front view showing a state in which many bell mouths are arranged vertically and horizontally.

FIG. 5 is an exploded perspective view showing a formwork for manufacturing a special part having a bell mouth.

FIG. 6 is a cross-sectional plan view showing a state where a special portion having a bell mouth is manufactured by pouring mortar into a mold.

FIG. 7 is a vertical cross-sectional view of a main part showing a state in which a bell mouth smaller than the thickness of the special part is embedded by the first method.

FIG. 8 is a vertical cross-sectional view of a main part showing a state in which a bell mouth smaller than the thickness of the special part is embedded by the second method.

FIG. 9 is a sectional view showing a conventional connecting joint.

FIG. 10 is a vertical cross-sectional view showing a state in which a side surface portion having a joint for connection is formed by a conventional method

FIG. 11 is an exploded perspective view showing a final stage for manufacturing a special portion by a conventional method.

[Explanation of symbols]

1 Special section 1A through hole 1a Side part 1b middle part 2 underground pipes 3 Connection joint 4 Bellmouth 4A inside 4B base end 4D exterior 4E protrusion 4F step 5 duct sleeve 5A tip 5B base end 5C protrusion 5D recess 6 rubber ring 7 Mortar 8 formwork 8A outer frame 8B inner frame 8C bottom frame 9A magnet 9B positioning jig 9C elastic body 9D pipe 9E coil spring 9b recess 10 Connection fitting 10A First tube part 10B Second tube part 11 Bottom plate 12 side plate 13 volt 14 nuts

Claims (2)

(57) [Claims] 1. A connecting joint for connecting a buried underground pipe to a special portion such as a handhole or manhole used for a common groove for electric wires, wherein the inner surface of the tip portion on the inner side of the special portion is formed by expanding the outer surface. A bell mouth formed in a trumpet shape and having a dimension in the pipe axial direction fixed to the special portion so as to be substantially equal to the thickness of the special portion; and one end of the bell mouth in the underground buried pipe in the pipe axial direction thereof. in moving freely connected and made the other end and a fixable duct sleeve fitted into said bell mouth, said
In addition to providing multiple protrusions on the outer surface of the bell mouth,
A joint for connection that is provided with a plurality of protrusions at a set distance in the circumferential direction . 2. A hand hole or a marker used for the electric wire common groove, etc.
Connections for connecting underground pipes to special parts such as
Is a joint for use in which the inner surface of the tip on the inner side of the special section is expanded outward.
It is formed into a substantially trumpet-like shape and is fixed through the special part.
The dimension in the axial direction of the pipe to be approximately equal to the thickness of the special part
Configured bell mouth and one end of it into the underground pipe
Connected movably in the tube axis direction, and the other end of the bell
Consisting of a duct sleeve that can be internally fitted and fixed to the
The outer diameter of the bell mouth is the same in the tube axis direction.
A connecting joint configured as described above .