JP2000059972A - Man-hole joint and connecting structure of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely connect a guide pipe and a protection pipe allowing insertion of optical fiber cable and communication cable, etc., to the side wall of a man-hole or the like at the time of burying the optical cables and communication cables or the like to the underground area. SOLUTION: This joint A is a man-hole joint in which the other end of an external pipe 1 having an enlarged diameter socket 11 at its one end is closed by a flange 3 and an internal pipe 4 is provided at the internal side of the external pipe 1 through the flange 3. Here, the flange side of the man-hole joint A is inserted to a connecting hole 51 bored to the side wall 5 of the man- hole or the like and the gap between the external circumference surface and side wall of the connecting hole 51 is filled with a joint filler such as cement or mortar or the like for the purpose of joint. Moreover, the end portion of a protection pipe 6 is inserted to the enlarged diameter socket 11 of the external pipe 1 and the enlarged diameter socket 11 and protection pipe 6 are connected to freely expand and compress via a seal ring 8 provided between these elements and the internal pipe 4 provided at the internal side of external pipe 1 is connected with the guide pipe 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily and reliably connecting a conduit for inserting an optical fiber cable, a communication cable and the like and a protective tube to a side wall of a manhole or the like when the optical fiber cable and the communication cable and the like are buried underground. It relates to a possible manhole joint and its connection structure.

[0002]

2. Description of the Related Art In recent years, communication information networks have been developed and expanded, and optical fiber cables, communication cables, and the like have been buried underground. For example, as shown in a schematic cross-sectional view of FIG. 3, the manholes M1 and M2 are buried at a predetermined interval, and the manholes M1 and M2 are connected by a U-shaped groove S1 made of concrete. Then, as shown in a schematic longitudinal sectional view in FIG.
A plurality of cable protection tubes P are laid in the groove S1, and the U-shaped groove S1 is covered with a cover S2 and buried in the ground, and an optical fiber cable or a communication cable C is inserted through the cable protection tube P. .

[0003]

However, in the case of this conventional construction example, there was a problem in connection between the manhole and the U-shaped groove. In other words, if the concrete manhole and the concrete U-shaped groove were connected using a joint material such as mortar or cement, the manhole and the U-shaped groove would be used when ground deformation occurred due to an earthquake or a wheel load. In some cases, a break occurred at a connection portion with the U-shaped groove, or the manhole or the U-shaped groove was damaged. Further, since the concrete U-shaped groove is heavy, there is a problem that a lot of manpower is required for construction work on site and the construction period is prolonged.

The present invention has been made to solve the above problem, and when burying an optical fiber cable, a communication cable and the like in the ground, a conduit and a protective tube for inserting the optical fiber cable and the communication cable and the like are provided on side walls of a manhole and the like. Provided is a manhole joint which can be easily and reliably connected, and a connection structure thereof.

[0005]

According to the manhole joint of the present invention, the other end of the outer tube having an enlarged diameter receiving port at one end is closed by a flange, and the inner tube is provided inside the outer tube through the flange. It is characterized by having been done.

In the connection structure for a manhole joint of the present invention, the other end of the outer tube having an enlarged diameter receiving port at one end is closed by a flange, and the inner tube is provided inside the outer tube through the flange. Using a manhole joint, insert the flange side of the manhole joint into the connection hole drilled in the side wall of the manhole, etc., and insert cement and cement into the gap between the outer peripheral surface and the wall surface of the connection hole.
Filling and joining mortar or other joint material, inserting the end of the protective tube into the enlarged-diameter receptacle of the outer tube, and expanding and contracting via a seal ring interposed between the enlarged-diameter receptacle and the protective tube It is characterized in that it is freely connected and a conduit is connected to an inner tube provided inside the outer tube.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cut-away sectional view of a manhole joint showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a state where a manhole joint is connected to a side wall of a manhole or the like.

The manhole joint A is composed of an outer tube 1 made of a synthetic resin such as a vinyl chloride resin, a flange joint 2, a flange 3, and an inner tube 4. On the outer periphery of the outer tube 1, a flange-shaped annular rib
Is provided, so that the pipe is not deformed in a flat shape due to the reinforcing effect of the annular rib 10 even when receiving an earth pressure, a wheel load, or the like. One end of the outer pipe 1 is provided with an enlarged diameter receiving port 11, and the other end is connected to the flange joint 2 via a short pipe 20. Sand is adhered to the outer surface of the flange joint 2, and the flange 3 is fixed to a flange 21 provided at one end thereof with bolts and nuts.

The flange 3 is provided with a plurality of through holes 31, and each of the through holes 31 has a short pipe 41 with a flange.
Is inserted. One end of a sleeve joint 42 is connected to each flanged short pipe 41. One end of the inner pipe 4 is connected to the other end of the sleeve joint 42, and the end of the inner pipe 4 is set substantially flush with the open end of the outer pipe 1. An end of the inner tube 4 is provided with an enlarged sleeve receiving port 43.

[0010] The manhole joint of the present invention has the above-described structure. The manhole joint is connected to the side wall 5 such as a manhole through the following operation procedure. First, a connection hole 51 is formed in a side wall 5 such as a manhole. At this time,
The connection hole 51 is formed slightly larger than the outer diameter of the flange 3 of the manhole joint A, and after the flange side of the manhole joint A is inserted into the connection hole 51, the outer peripheral surface and the wall surface of the connection hole 51 are connected. Fill the gap with joint material such as cement or mortar. Since sand or the like adheres to the outer surface of the flange joint 2, the flange joint 2 and the connection hole 51 are firmly connected via the joint material.

After connecting the manhole joint A to the side wall 5 such as a manhole in this way, the protective tube 6 is connected to the outer tube 1. At this time, a plurality of conduits 7 are inserted into the protective tube 6 in advance, and the protective tubes 6 are shifted to the left in FIG. Insert and adhesively bond. Next, the protection tube 6 is advanced to the right side in FIG. 2 and its end is inserted almost to the center of the enlarged diameter port 11 of the outer tube 1, and a seal is provided between the enlarged diameter port 11 and the protection tube 6. The connection is made to extend and contract via a ring 8.

As the protective tube 6 and the conduit 7, a vinyl chloride resin tube can be suitably used. In particular, as the protection tube 6,
If a ribbed pipe having flange-shaped annular ribs 61 provided on the outer periphery at predetermined intervals in the axial direction is used, deformation due to earth pressure, wheel load, or the like is prevented by the annular ribs 61, so that the pipe has a flat shape. It is not deformed and damaged.

At the time of this piping work, since the pipe gradient can be adjusted to some extent by the seal ring 8 at the same time as the connection of the protective tube 6, the work can be performed simply and reliably. In this way, the protection tube 6 and the conduit 7 are laid between the manholes, and after the protection tube 6 is backfilled, an optical fiber cable or a communication cable is inserted into each conduit 7 to complete the construction work.

After the pipe is installed, even if a thrust load acts on the protective pipe 6 in the axial direction of the pipe, or a bending moment acts on the protective pipe 6 due to earth pressure, wheel load, ground subsidence, etc., these deformations,
Since the movement and the like are permitted by the seal ring 8 interposed between the enlarged diameter receiving port 11 and the protection tube 6, the manhole joint A
Is not deformed and damaged, and the protective tube 6 is not damaged. In addition, since the optical fiber cable and the communication cable are inserted into the conduit 7 and the conduit 7 is protected by the protection tube 6, there is no danger that the optical fiber cable or the communication cable or the like may be damaged and transmission failure may occur.

[0015]

As described above in detail, in the present invention, the other end of the outer tube having the enlarged diameter receiving port at one end is closed by the flange, and the inner tube is provided inside the outer tube through the flange. Since the protection pipe is connected to the side wall of the manhole or the like via the manhole joint, the on-site construction work can be easily and reliably performed while appropriately adjusting the alignment of the protection pipe and the pipe gradient.

Further, even if a thrust load acts on the protective tube in the axial direction of the pipe or a bending moment acts due to earth pressure, wheel load, ground subsidence, etc., the deformation, movement, etc. of the outer pipe are not affected by the outer pipe. Since the absorption is reduced by the seal ring interposed between the enlarged diameter receiving port and the protection tube, the manhole joint is not deformed and damaged, and the protection tube is not damaged. In particular, when a ribbed tube having an annular rib provided on the outer periphery of the tube is used as the outer tube or the protection tube, deformation due to earth pressure, wheel load, or the like is prevented by the annular rib. There is no risk of damage. Then, the optical fiber cable and the communication cable are inserted into the conduit, and the conduit is protected by the protective tube, so that the optical fiber cable and the communication cable and the like are not damaged and transmission failure does not occur.

[Brief description of the drawings]

FIG. 1 is a partially cut-away sectional view of a manhole joint showing one embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention in which a manhole joint is connected to a side wall of a manhole or the like.

FIG. 3 is a schematic cross-sectional view of a conventional example showing a state in which a concrete U-shaped groove is connected to a concrete manhole.

FIG. 4 is a schematic longitudinal sectional view of a conventional example showing a state in which a plurality of cable protection tubes are laid in a U-shaped groove made of concrete and an optical fiber cable, a communication cable and the like are inserted into the protection tubes.

[Explanation of symbols]

 A Manhole joint 1 Outer tube 2 Flange joint 3 Flange 4 Inner tube 5 Side wall of manhole 6 Protective tube 7 Pipe

Claims (4)

[Claims] 1. An outer tube (1) having an enlarged diameter receiving port (11) at one end is closed at the other end by a flange (3), and penetrates through the flange (3) to be inside the outer tube (1). Inner tube (4)
A manhole joint characterized by the provision of: 2. The manhole joint according to claim 1, wherein annular flanges (10) are provided on the outer periphery of the outer tube (1) at predetermined intervals in the axial direction. 3. An outer tube (1) having an enlarged-diameter receiving port (11) at one end is closed at the other end by a flange (3), and penetrates through the flange (3) to be inside the outer tube (1). Inner tube (4)
A manhole joint (A) provided with a flange, the flange side of the manhole joint (A) is inserted into a connection hole (51) formed in a side wall (5) of a manhole or the like, and the outer peripheral surface thereof is connected to the connection hole (51). ) Is filled with a joint material such as cement, mortar, or the like, and is joined to the outer wall (1).
1) The end of the protective tube (6) is inserted into the tube, and is connected to extend and contract via a seal ring (8) interposed between the enlarged diameter port (11) and the protective tube (6). A connection structure for a manhole joint, wherein a conduit (7) is connected to an inner pipe (4) provided inside the outer pipe (1). 4. The connection of a manhole joint according to claim 3, wherein flange-shaped annular ribs (61) are provided on the outer periphery of the protective tube (6) at predetermined intervals in the axial direction. Construction.