JPH11289646A - Manhole joint and connecting structure of manhole joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole joint and a connecting structure for the manhole joint, wherein when optical fiber cables, communication cables or the like are buried underground, an inner tube or protective tube with the optical fiber cables, communication cables or the like inserted therein can be easily connected with reliability to the sidewall of a manhole or the like. SOLUTION: The rear face of a flange 21 of a joint member 2 is welded and jointed with the surface of the sidewall 1 of a manhole or the like. Furthermore, a widening band c1 is fit into the inside of the cylindrical portion 22 inserted into a connection hole 11 formed in the sidewall 1, and the circumference of the cylindrical portion 22 with its bore widened is welded and jointed with the wall face of the connection hole 11. One end of an inner tube 6 inserted into a protective tube 4 is inserted and secured in an insertion hole 310 in a support plate 31 which fits into one end of a sleeve short tube 3, as well as the end of the protective tube 4 is inserted into the sleeve short tube 3 with a seal ring 5 in-between.

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 inserting an insertion tube and a protection tube for inserting an optical fiber cable, a communication cable, etc. into a side wall of a manhole when the optical fiber cable, the communication cable, etc. are buried underground. The present invention relates to a manhole joint that can be connected and a connection structure of the manhole joint.

[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, co-cement, etc., when the ground deformation occurred due to an earthquake or a wheel load, the manhole and the U-shaped groove were connected. 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.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem. When an optical fiber cable, a communication cable and the like are buried in the ground, an insertion tube and a protection tube through which the optical fiber cable and the communication cable are inserted are connected to a side wall such as a manhole. Provided is a manhole joint and a manhole joint connection structure that can be easily and reliably connected to a manhole joint.

[0005]

The invention according to claim 1 has a flange-shaped flange on one end outer peripheral side of a cylindrical portion inserted into a connection hole formed in a side wall of a manhole or the like. The joint member is made of an elastic member such as rubber provided with a cylindrical joint integrally via a bent portion extending to the inner peripheral side, and a sleeve short tube inserted into the cylindrical joint of the joint member. Fixing a short sleeve inserted into the cylindrical joint by tightening a band wound around the cylindrical joint, and a supporting plate having a through hole at one end of the short sleeve inserted into the cylindrical joint. It is characterized by being attached.

According to a second aspect of the present invention, the cylindrical portion of the manhole joint is inserted into a connection hole formed in a side wall of a manhole or the like, and an expanded band is mounted on the inner peripheral side of the cylindrical portion to expand the diameter. The outer peripheral surface of the cylindrical portion is adhesively bonded to the wall surface of the connection hole, the back surface of the flange is adhesively bonded to the outer surface of the side wall, and the end of the protective tube is inserted into the sleeve short tube of the manhole joint via a seal ring. In addition, one end of the inner tube inserted into the protective tube is inserted and fixed in a through hole of a support plate mounted on one end of the sleeve short tube.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a 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. In the figure, A is a manhole joint, 1 is a side wall of a manhole or the like, and a connection hole 11 is formed in the side wall 1.
2 is a joint member, 3 is a sleeve short tube, 4 is a protection tube, 5 is a seal ring, and 6 is an intubation tube.

The manhole joint A of the present invention is a joint member 2 made of an elastic member such as rubber or soft plastic.
And a sleeve short tube 3 made of a synthetic resin such as PVC. Flange-shaped flange 2 constituting joint member 2
A cylindrical portion 22 is integrally provided on the back side of the first member 1 via a bent portion 22a, and a bent portion 23 is provided on the front side of the flange portion 21.
The cylindrical joint part 23 is provided integrally via a.
An adhesive a such as butyl rubber is uniformly applied to the outer peripheral surface of the cylindrical portion 22 and the back surface of the flange portion 21.
Is covered with release paper b.

One end of the sleeve short tube 3 is fitted into the cylindrical joint 23 of the joint member 2 and is fixed by a band c2 wound around the outer periphery of the cylindrical joint 23. A plurality of serrated annular projections are provided on the inner peripheral surface of the cylindrical connecting portion 23 around which the band c2 is wound, and the annular projections are elastically deformed by tightening the band c2 so that the sleeve short tube 3 is formed. Is pressed against the outer peripheral surface in a watertight manner. A support plate 31 is mounted on one end of the sleeve short tube 3 inserted into the cylindrical joint 23. The support plate 31 has a through hole 310
Are provided at predetermined intervals, and a seal ring d is attached to a peripheral portion of each through hole 310.

[0010] The manhole joint A of the present invention has the above-described structure, and releases the release paper b from the back surface of the flange portion 21 of the joint member 2 and the outer peripheral surface of the cylindrical portion 22 at the time of piping. The back surface of the portion 21 is pressed against the side wall 1 such as a manhole to be bonded and bonded, and the cylindrical portion 22 is inserted into the connection hole 11. Therefore, an extension band c1 having a part of the circumference cut in the axial direction is attached to the inner peripheral side of the cylindrical portion 22, and the outer peripheral surface of the cylindrical portion 22 expanded by expanding the diameter of the extended band c1 is connected. It is adhesively bonded to the wall surface of the hole 11.

A manhole joint A is provided on a side wall 1 of a manhole or the like.
After bonding, the protective tube 4 is connected to the sleeve short tube 3 connected to the joint member 2. At this time, a plurality of inner tubes 6 are inserted through the protective tubes 4 in advance, and the protective tubes 4 are shifted to the right in FIG.
And through a seal ring d for watertight connection.

After fixing the ends of the plurality of insertion tubes 6 inserted through the protection tube 4 to the support plate 31 in this manner, the protection tube 4 is shifted to the left in FIG. Insert into tube 3. The protective tube 4 is a synthetic resin ribbed tube in which an annular flange for reinforcement is integrally provided on the outer peripheral surface of the vinyl chloride resin tube at a predetermined interval in the tube axis direction, and is provided at an end of the tube. After the seal ring 5 is attached between the annular flanges, the seal ring 5 is inserted into the sleeve short tube 3, and the protective tube 4 is connected via the seal ring 5 so as to be stretchable. During this connection work, the eccentricity of the protective tube 4 with respect to the connection hole 11 of the side wall 1 and the pipe gradient can be adjusted by the bent portions 22a and 23a of the joint member 2 made of an elastic member, so that the construction work can be performed easily and reliably. . After laying the protection tube 4 and the insertion tube 6 between the manholes in this way, the protection tube 4 is backfilled, and an optical fiber cable or a communication cable is inserted into each of the insertion tubes 6 to complete the construction work.

After the piping is constructed, even if a thrust load acts on the protective tube 4 in the axial direction of the tube, or if a bending moment acts on the protective tube 4 due to earth pressure, wheel load, ground subsidence, etc., these deformations,
The movement and the like are performed by the bent portion 22a of the joint member 2 made of an elastic member,
Since the manhole joint A is deformed and damaged, and the protection tube 4 is not damaged because it is allowed by 23a. In addition, since the optical fiber cable and the communication cable are inserted into the inner tube 6, and the inner tube 6 is protected by the protective tube 4, the optical fiber cable, the communication cable signal and the like are not damaged, and the transmission failure does not occur. .

[0014]

As described above in detail, according to the present invention, since a protective tube is connected to a side wall of a manhole or the like via a manhole joint made of an elastic member such as rubber, the eccentricity of the protective tube can be reduced during piping work. It is possible to easily and reliably connect the pipe by appropriately adjusting the gradient of the pipe. In addition, even if a thrust load in the pipe axis direction acts on the protective tube after the pipe is installed, or a bending moment acts due to earth pressure, wheel load, or ground subsidence, these deformations, movements, etc., are performed by joints made of elastic members. Since the manhole joint is allowed to be deformed and damaged by the bent portion of the member, the protection tube is not damaged. Moreover, optical fiber cables and communication cables are inserted through the intubation,
Since the intubation is protected by the protective tube, there is no possibility that an optical fiber cable, a communication cable signal, or the like will be damaged and transmission failure will not occur.

[Brief description of the drawings]

FIG. 1 is a 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 Side wall such as manhole 11 Connection hole 2 Joint member 21 Flange 22 Cylindrical part 23 Cylindrical joint 3 Sleeve short pipe 31 Support plate 4 Protective pipe 5 Seal ring 6 Inner cannulation

Claims (3)

[Claims] 1. A cylindrical flange (22) inserted into a connection hole (11) formed in a side wall (1) such as a manhole has a flange-shaped flange (21) on one outer peripheral side. A joint member (2) made of an elastic member such as rubber and having a cylindrical joint portion (23) integrally provided through a bent portion (23a) extending to the inner peripheral side of (21); 2) a sleeve short tube (3) inserted into the cylindrical joint portion (23);
The band (c2) wound around the cylindrical joint portion (23) was tightened to fix the sleeve short tube (3) inserted into the cylindrical joint portion (23), and was inserted into the cylindrical joint portion (23). A manhole joint, wherein a support plate (31) having a through hole (310) is attached to one end of a sleeve short tube (3). 2. A cylindrical portion (22) of the manhole joint is inserted into a connection hole (11) formed in a side wall (1) of a manhole or the like, and an extension band (c) is inserted into an inner peripheral side of the cylindrical portion (22).
The outer peripheral surface of the cylindrical portion (22) having the diameter increased by mounting 1) is adhesively bonded to the wall surface of the connection hole (11), and the flange portion (21).
Is bonded to the outer surface of the side wall (1) by adhesive, and the end of the protective tube (4) is inserted into the short sleeve tube (3) of the manhole joint via the seal ring (5), and the protective tube (4) is inserted. One end of the intubation tube (6) inserted into the end of the support plate (31) attached to one end of the sleeve short tube (3).
10) A connection structure for a manhole joint, which is inserted and fixed in 10). 3. The connection structure for a manhole joint according to claim 2, wherein said protection tube is a tube with a synthetic resin rib having an annular flange on an outer peripheral surface.