JP3442599B2 - Underground pipe fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly connects underground pipes made of concrete, earthenware, etc., which are provided with pipes through which communication lines (optical fibers, electric wires, etc.) and power transmission lines are inserted. Connection equipment for.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIGS. 11 and 12, when connecting an underground burying pipe 101 to a pipe 103 protruding from an underground burying handhole 102,
A sealing material 105 is annularly attached to the end surfaces of both pipes 101 and 103. On the other hand, among a plurality of connecting pipes formed of concrete or earthenware and having different pipe lengths, the connecting pipe 104 having a pipe length corresponding to the distance dimension between the end faces of the two pipe bodies 101 and 103 is selected.
Then, while compressing the respective sealing materials 105 on the end surfaces of the pipes 101 and 103, the pipes 101 and 103 are compressed.
After the connection pipe 104 is inserted between the two, the screw rod 107 is attached to the pipe body 103 and the connection pipe 1 from the handhole 102 side.
By screwing into the connection nut 106 on the end surface of the pipe 101 through the connection holes 04, the pipes 101, 10
3 is connected.

[0003]

By the way, both pipes 10
In the conventional one in which the pipes 101 and 103 are connected by the connecting pipe 104, the pipes 101 and 103 are compressed while the sealing materials 105 on the end surfaces of the pipes 101 and 103 are compressed.
The connecting pipe 104 had to be inserted between the two, and the work was troublesome and required a lot of trouble. Further, when both pipes 101 and 103 are bent and connected, a bending pipe must be used instead of the connecting pipe 104, and moreover, it is necessary to prepare and prepare a large number of bending pipes having different radii of curvature. However, there is a problem that the connection cost of the pipe body is increased. From this, it is conceivable to connect the pipes using an expandable connector such as a bellows structure.
Since such a connector is difficult to withstand a load such as earth pressure and is easily damaged, it cannot be used as a connector for underground pipes. In view of the conventional problems described above, an object of the present invention is not only to be able to easily connect a pipe for underground burying in a straight line or by bending, but also to sufficiently withstand a load such as earth pressure. Is possible, and is earthquake-resistant,
An object of the present invention is to provide a connector for an underground burying pipe which is excellent in durability and the like.

[0004]

In order to achieve the above-mentioned object, a connecting tool for an underground burying pipe body according to the invention of claim 1 comprises:
A ground composed of multiple connector units connected in series
A connecting tool for a lower burying pipe, the connecting tool unit
Is the first and second end plates and the first and second end plates
Stretchable cover body that can be stretched over between
And insertions formed on the first and second end plates, respectively.
Protection that protects the expansion cover by being inserted over the hole
A pipe, and the first and second end plates and the protective pad.
Between the first and second end plates,
The amount of movement of the expansion cover to limit the expansion amount of the expansion cover body.
Is provided with a limiting means for
Tighten both end plates with no gap between them.
Connecting means for attaching and connecting the adjoining connector units
Is provided.

[0005] Therefore, with respect to during the underground pipe bodies adjacent at a predetermined distance, a plurality of contact constituting the connector
Each Shin contraction cover body connection ingredients unit by respectively contracted volume
It can be easily inserted. Then, after the first end plate of the connector unit that faces the one end is attached to the end face of the one pipe, the opposite end is connected to the end face of the other pipe.
By attaching the second end plate of the ingredient unit, the both pipes are easily connected. Since each extension <br/> contraction cover body of a plurality of connectors unit is protected respectively by the protective pipe, a problem that the elastic cover member is damaged is prevented by the earth pressure. Further, first, by the amount of movement of separating direction of the second end plates 11 and 21 to regulate respectively limits the elongation amount of the telescopic cover, elastic cover body is excessive by the limiting means of the plurality of connectors Unit It is also possible to prevent the problem of being stretched and broken. Moreover, since the opposing end plates of the connector units adjacent contact is connected by connecting means, connecting device configured to required number of connector units are connected in series.

According to a second aspect of the present invention , there is provided an underground burying pipe connector according to the first aspect of the present invention, which is the underground burying pipe connector according to the first aspect. First and second retaining plates formed on the inner peripheral surfaces of the insertion holes of the second end plates, and limiting flanges formed on the outer peripheral surfaces of both end portions of the protective pipe, which are engageable with the retaining locking pieces. It is characterized by having. Therefore, the limiting means for limiting the expansion amount of the expandable cover body is configured without increasing the number of parts.

According to a third aspect of the present invention , there is provided a connecting member for an underground burying pipe, wherein the connecting member for an underground burying pipe according to the first aspect includes first end plates located at both ends of the connecting device. Between the second end plate and the second end plate, there is provided a tightening means including a screw rod for tightening the first and second end plates toward each other to hold the expandable cover body in a compressed state. A fragile portion that is cut by a tightening force equal to or more than a predetermined value is formed at a substantially central portion in the longitudinal direction of the. Therefore, since the expansion / contraction cover body of the connecting tool composed of the required number of connecting tool units is held in the compressed state by the tightening means provided with the threaded rod, the inserting work of the connecting tool between the underground burying pipes can be performed. It will be even easier. After that, when a tightening force of a predetermined value or more is applied to the screw rod, the screw rod is cut at the fragile portion,
Expansion and contraction of the expansion and contraction cover body is allowed without being restricted by the screw rod.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG. 8, the connector 9 for connecting the underground burying pipe 1 and the pipe 3 of the handhole 2 has a plurality of (four in the figure) connector units 10 in series. It is composed by being connected to. As shown in FIGS. 1 to 3, the connector unit 10 includes first and second end plates 11 and 21 facing each other with a predetermined gap, and the first and second end plates 11 and 21.
An expandable cover body 40 is attached between the outer periphery of the expandable cover body 40 so as to extend and contract, and a protective pipe 50 for protecting the expandable cover body 40.

The first and second end plates 11 and 21 are made of a hard synthetic resin, a metal such as aluminum or cast iron, and the first and second end plates 11 and 21 have tubular bodies 1 and 3, respectively. A predetermined number of insertion holes 1 at positions corresponding to the cable insertion holes of
2 and 22 are provided so as to penetrate therethrough, and these insertion holes 12 and 22 are provided.
The retaining engagement pieces 13 and 23 for the protection pipe 50 are formed in the inner openings facing each other. Also,
The first and second end plates 11 and 21 are provided with through holes 14 and 24 at their center portions, respectively, and are located near the peripheral edge portion between the insertion holes 12 and 22. The connecting holes 15 and 25 are each penetrated. In addition, the first,
On the outer side surfaces of the second end plates 11 and 21, annular locking grooves 16 and 26 are provided along the peripheral edges thereof.

The elastic cover body 40 is made of CR, NBR, EP.
It is made of rubber such as DM or silicon, or soft synthetic resin such as vinyl chloride, PP or PE, and is formed by blow molding, extrusion molding, injection molding or the like. As shown in FIG. 2, the elastic cover body 40 includes a bellows-like body portion 41 having a bellows-like structure having a high elasticity and a first and second end portions of the bellows-like body portion 41.
Extending parts 42 extending along the outer peripheral surfaces of the second both end plates 11, 21 and contacting the outer surfaces of the first and second both end plates 11, 21 from the tips of the both extending parts 42. The folding edges 43 folded back at right angles, and the locking projections 45 projecting from the tips of both the folding edges 43 toward the locking grooves 16, 26 of the first and second end plates 11, 21 respectively. And are integrated. Then, the expansion and contraction cover body 40 has both the locking projections 4
5 is locking grooves 16 and 26 of the first and second end plates 11 and 21.
By being press-fitted and locked to the respective ends, the first and second end plates 11 and 21 are assembled so as to straddle the outer peripheries thereof.

As shown in FIGS. 1 and 2, the protection pipe 50 is assembled so as to be movable across the insertion holes 12 and 22 of the first and second end plates 11 and 21, respectively.
The expansion and contraction cover body 40 is protected without hindering the expansion and contraction of the expansion and contraction cover body 40. These protection pipes 50 are made of a rigid pipe such as a hard synthetic resin or a metal, and a cable insertion hole 51 is formed at the center thereof. The outer peripheral surfaces of both ends of the protective pipe 50 have a diameter slightly smaller than that of the insertion holes 12 and 22 of the first and second end plates 11 and 21, respectively.
Limiting flanges 52 are formed to engage the retaining locking pieces 13 and 23 formed in the above. The retaining locking pieces 13 and 23 and the limiting flange 52 constitute a limiting means, and the limiting means forms the first and second end plates 1.
The expansion / contraction cover body 40 that regulates the amount of movement of 1 and 21 in the separating direction
By limiting the amount of expansion of the expansion cover 40, it is possible to prevent the expansion cover 40 from being excessively expanded.

Further, in this embodiment, the retaining engagement pieces 13 and 23 of the insertion holes 12 and 22 and the limiting flange 5 are provided.
In consideration of the assemblability, the notch 2 is formed with notches separated by an angle of about 90 degrees and having an angle of about 90 degrees. Then, the protection pipe 50 is rotated approximately 90 degrees when one of the limiting flanges 52 passes through the retaining locking piece 13 of the insertion hole 12 of the first end plate 11, and subsequently, the one limiting flange 52 is moved to the first limiting flange 52. 2 End plate 21 insertion hole 2
When it is inserted up to a position where it passes through the second retaining locking piece 23, it can be moved over the insertion holes 12 and 22 of the first and second end plates 11 and 21 by being rotated approximately 90 degrees. Both limiting flanges 52 of the protective pipe 50 are attached to the stopper holes 13 and 2 of the insertion holes 12 and 22, respectively.
3 so that they can engage with each other.

As shown in FIG. 4, the connector unit 10 constructed as described above is connected in series by a connecting means including a connecting nut 30 and a connecting bolt 31, whereby the connector 9 is formed. It

That is, in this embodiment, FIG.
As shown in FIG. 5, the connection nuts 30 are respectively fixed to the connecting holes 25 of the second end plate 11 of the connector unit 10 by being prevented from rotating, and the inside of the connecting nuts 15 are inserted into the connecting holes 15 of the first end plate 11. The connecting bolts 31 made of hexagon socket head cap bolts are respectively inserted from the outside to the outside. Then, in a state where the first end plate 11 of another connecting tool unit 10 is aligned with the second end plate 21 of the connecting tool unit 10,
When each connecting bolt 31 of the connector unit 10 is screwed into the connecting nut 30 of another connector unit 10, the folding edges 43 of the expandable cover bodies 40 of these connector units 10 are elastically compressed and closely contact each other. As a result, the connector units 10 are connected in series without a gap. The required number of, for example, four connector units 10 are connected in series to configure the connector 9.

Further, as shown in FIG. 4, between the first end plate 11 and the second end plate 21 located at the left and right ends of the connector 9 constituted by the required number of connector units 10. The first and second end plates 11 and 21 are tightened in a direction in which they approach each other, and the expansion / contraction cover body 4 of each connector unit 10 is tightened.
Tightening means are provided with a threaded rod 61 for holding the bellows-shaped body 41 of 0 in a compressed state.

That is, as shown in FIG. 4, the through holes 14a and 24a penetrating through the central portions of the first end plate 11 and the second end plate 21 located at the left and right ends of the connector 9 are The first end plate 11 and the second end plate 21 are formed to have an appropriately smaller diameter than the through holes 14 and 24, and the connecting collars 64 are inserted into the small diameter through holes 14a and 24a, respectively. Then, the screw rod 61 is inserted through the central holes of the both connection collars 64. Male screws whose screw directions are reversed are formed on both ends of the screw rod 61, and a fixing nut 60 and a connecting nut 63 formed of both screw nuts are provided on the left and right sides of the connecting tool 9, respectively. The first and second end plates 11 and 21 located at both ends are respectively sandwiched and screwed, whereby the first and second end plates are inserted.
Both end plates 11 and 21 are tightened in a direction in which they approach each other to hold the bellows-like body portion 41 of the expandable cover body 40 of each connector unit 10 in a compressed state. In addition, a weak portion that is cut by a tightening force of a predetermined value or more is formed in an annular cut groove 6 at a substantially central portion in the longitudinal direction of the screw rod 61.
It is formed by 2.

Next, the connector 9 constructed as described above.
The case of connecting the underground burying pipe 1 and the pipe 3 protruding from the handhole 2 in a straight line by using will be described in the order of steps. First, as shown in FIG. 6, the connector 9 is inserted between the underground burying pipe 1 and the pipe 3 of the handhole 2. At this time, the connector 9 is configured by connecting a required number of connector units 10 in series, and each connector of the connector 9 is tightened by a screw rod 61, a fixing nut 60, and a connecting nut 63. Telescopic cover body 4 of unit 10
Since the bellows-shaped body 41 of 0 is held in a compressed state, the tube body 3 for underground burying and the tube body 3 of the handhole 2 are held.
The insertion work of the connecting tool 9 between the and is easily performed.

Next, as shown in FIG. 7, one of the connection nuts of the threaded rod 61 that fastens the connector 9 to the end of the threaded rod 71 inserted into the connection hole of the underground burying pipe 1. 6
When the connection nut 63 of the threaded rod 61 is rotated in a predetermined direction by the tightening tool 90 in a state in which the connection rod 3 is in contact with the connection rod 63, the connection nut 63 of the one connection is the underground burying pipe body 1. Screwed into the end of the threaded rod 71 of the first end plate 1 located at one end of the connector 9.
1 abuts on the elastic cover body 40 via the folded edge 43 without any gap.

Subsequently, as shown in FIGS. 7 and 8, the other connecting nut 63 of the screw rod 61 is connected to the tightening tool 9 by the tightening tool 9.
When the screw rod 61 is rotated in a predetermined direction by 0 and a tightening force of a predetermined value or more is applied to the screw rod 61, the screw rod 61 is cut at the fragile portion formed by the cut groove 62. As described above, the threaded rod 61 is cut at the fragile portion thereof, so that the bellows-shaped body portion 41 of the expansion / contraction cover body 40 in each connector unit 10 of the connector 9 is removed from the handhole 2 based on its elastic force. It extends for a predetermined length toward the end surface of the tubular body 3.

Finally, as shown in FIG. 9, the threaded rod 6
The other connection nut 63 of No. 1 and the through hole 24 of the second end plate 21.
While the anti-rotation collar is loaded in between, the screw rod 80 is inserted from the inside of the hand hole 2 through the through hole of the tube body 3. Then, one end of the screw rod 80 is screwed into the rotation-stopped connection nut 63, and the connection nut 8 composed of both screw nuts is attached to the other end of the screw rod 80.
1 is screwed in. Then, the screw rod 80 is rotated in a predetermined direction together with the connection nut 81 by the tightening tool 90, so that the second end plate 21 at the other end of the connection tool 9 is
The expansion cover body 40 of each connector unit 10 is extended and drawn to the end surface of the pipe body 3 of the handhole 2. Then, the connection nut 81 is tightened with a predetermined tightening force, so that the second end plate 21 at the other end of the connector 9 is connected to the tubular body 3 of the handhole 2 via the folding edge 43 of the expandable cover body 40. It is brought into contact with the end surface of the pipe without any clearance, whereby the pipe body 1 for underground burial and the pipe body 3 of the handhole 2 are connected by the connector 9.

After the underground burying pipe body 1 and the pipe body 3 of the handhole 2 are connected by the connecting tool 9 as described above,
The underground burying pipe 1, the pipe 3 of the handhole 2 and the connector 9 are covered with soil and buried in the ground. As described above, when the underground burying pipe 1, the pipe 3 of the handhole 2 and the connecting tool 9 are buried in the ground, the earth pressure is applied to the connecting tool 9.
Expansion / contraction cover body 4 of each connector unit 10 constituting the
Although it acts on the bellows-shaped body portion 0 of 0, since the bellows-shaped body portion 41 is protected by the protection pipe 50, the problem that the bellows-shaped body portion 41 is damaged by the earth pressure is prevented. Furthermore, in each connector unit 10 of the connector 9, the first and second end plates 11 are formed by the stopper means 13 and 23 and the limiting means constituted by the limiting flange 52.
Since it is possible to restrict the amount of movement of 21 in the separating direction and limit the amount of expansion of the expansion / contraction cover body 40, each connector unit 1
Out of 0, one expansion cover body 40 is prevented from being excessively stretched and damaged, which is excellent in durability and earthquake resistance.

Further, the connecting tool 9 constructed as described above.
Is used for connecting the underground burying pipe 1 and the pipe 3 protruding from the handhole 2 in a straight line, and as shown in FIG. By bending the expandable cover body 40 in the tool unit 10 at each of the bellows-shaped body portions 41, it is possible to bend and connect the adjacent pipe bodies 1 and 1 or 1 and 3 at a predetermined interval. Further, the connector 9 can be configured by connecting four or more connector units 10 in series, or can be configured by four or less connector units 10.
It is also possible to comprise only one connector unit 10.

[0023]

As described above, according to the invention described in claim 1, not only can the underground burying pipe be linearly or bent to be easily connected, but also a plurality of connecting tools can be used.
Attach each expansion cover of the connector unit of the
Each By protect Te, it is possible to prevent a problem that the elastic cover member from being damaged by the earth pressure, moreover, the first, the movement amount of the separating direction of the second end plates of the connector units by the restriction means By restricting and limiting the amount of expansion of the elastic cover body, it is possible to prevent the problem that the elastic cover body is excessively expanded and damaged, and is excellent in durability and earthquake resistance. Also, by connecting in series by connecting means opposing end plates of the main number of the connector units Tokoro, it can be easily configured the connector length to the required. According to the second aspect of the present invention, it is possible to configure the restriction means for restricting the expansion amount of the expandable cover body without increasing the number of parts, and it is possible to provide at low cost. According to the invention as set forth in claim 3, the work of inserting the connecting tool between the underground burying pipes can be further facilitated, the work of connection can be performed efficiently, and the screw rod is cut at the fragile portion. As a result, the expansion and contraction of the elastic cover body can be allowed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connection unit that constitutes a connector according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a connection unit in which a protection pipe is likewise assembled.

FIG. 3 is a front view showing the same connection unit.

FIG. 4 is a sectional view showing a state in which a plurality of connection units are similarly connected by a connecting means and the expansion cover body is compressed by a tightening means.

FIG. 5 is a cross-sectional view showing a portion to which each protection pipe of a connection tool, which is also formed by a plurality of connection units, is assembled.

FIG. 6 is an explanatory view showing a state in which a connector is also inserted between underground burying pipes.

FIG. 7 is an explanatory view showing a state in which a connecting tool is fastened to one end surface of the underground burying pipe body.

FIG. 8 is an explanatory view showing a state in which the threaded rod of the fastening means of the connector has been cut at the fragile portion at the center thereof.

FIG. 9 is an explanatory view showing a state in which pipes for underground burying are similarly connected by a connecting tool.

FIG. 10 is an explanatory view showing a state in which the underground burying pipe is also bent and connected by a connecting tool.

FIG. 11 is an explanatory view showing a state before inserting a connecting pipe between conventional underground burying pipes. FIG.

FIG. 12 is an explanatory view showing a state in which pipes for underground burying are similarly connected by a connecting pipe.

[Explanation of symbols]

1 Underground pipe 2 hand holes 3 tube 9 connection 10 connector unit 11 First end plate 12 insertion holes 13 Locking retaining piece (restriction means) 14 through holes 15 connecting holes 21 Second end plate 22 insertion hole 23 Locking piece (restriction means) 24 through holes 30 Connection nut (connection means) 31 Connection bolt (connection means) 40 Telescopic cover body 41 bellows 50 protective pipe 52 Limiting Flange (Limiting Means) 61 screw rod 62 Notch groove (fragile part)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Kondo 64, Kabun Kogyo Co., Ltd., No. 1, Bozuyama, Yokone Town, Obu City, Aichi Prefecture (56) References JP-A-54-9436 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 1/024 F16L 27/12

Claims (3)

(57) [Claims] 1. A connecting tool for an underground burying pipe, which is configured by connecting a plurality of connecting tool units in series, wherein the connecting tool unit includes first and second end plates, and these first and second end plates. A stretchable cover body that is assembled so as to extend and contract across the second end plates, and a protective pipe that is inserted through the insertion holes formed in the first and second end plates to protect the stretchable cover body. Between the first and second end plates and the protective pipe,
Limiting means for limiting the amount of movement of the first and second end plates in the separating direction to limit the amount of expansion of the elastic cover body is provided, and between the opposite end plates of the adjacent connector unit, these are provided. A connector for an underground burying pipe, which is provided with a connecting means for connecting the adjacent connector units by tightening both end plates without a gap. 2. The underground burying pipe connector according to claim 1, wherein the limiting means for limiting the amount of expansion of the expandable cover is provided on the inner peripheral surfaces of the insertion holes of the first and second end plates. An underground burying pipe, comprising: formed retaining lock pieces; and limiting flanges that are engageable with these retaining lock pieces and that are formed on the outer peripheral surfaces of both ends of the protective pipe. Connection. 3. A underground pipe body of the connector according to claim 1, between the first end plate and a second end plate positioned at both ends of the connector, these first, second Tightening means including a screw rod for holding the expansion cover body in a compressed state by tightening both end plates of the two end plates in a direction approaching each other is provided. A connector for an underground burying pipe, characterized in that a fragile portion that is cut by force is formed.