JP2832286B2 - Duct sleeve for manhole extension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct sleeve for an additional opening of a manhole, and more particularly to an improvement in a groove for accommodating a resin adhesive impregnated body provided on an outer peripheral portion of the duct sleeve and the impregnated body itself.

[0002]

2. Description of the Related Art Conventionally, a place for providing an additional duct is prepared in advance on the side wall of an existing underground structure such as a manhole, and a through hole is opened when the duct is extended, and a communication cable or the like is inserted into the through hole. There is known a construction method of performing piping. An O-ring and an adhesive are attached to the outer peripheral portion of the sleeve of the additional duct sleeve, which is inserted from the inside of the manhole to the outside and fixed to the manhole in the through hole for providing the duct addition port, facing the inner peripheral surface of the through hole. The present applicant has proposed a construction method in which a plurality of elastic support pieces and the like are provided along the length direction of the sleeve, and are inserted and fixed in the through holes.

[0003]

By the way, in the above-mentioned conventional construction method, when the resin adhesive impregnated body accommodated in the adhesive accommodating groove inserts the duct sleeve into the duct extension opening, It is displaced from the groove for accommodating adhesive due to frictional resistance with the expansion port, and the intended adhesive effect cannot be exhibited.
There was a problem.

[0004] The present invention has been made to solve the above problems.

[0005]

In order to achieve this object, the present invention provides a through hole at a predetermined portion of an existing underground structure such as a manhole, and a pipe for inserting a communication cable or the like into the through hole. In the duct expansion sleeve which is inserted into the duct addition opening from the inside to the outside of the manhole and fixed to the manhole, the duct sleeve is inserted in the outer peripheral portion facing the inner peripheral surface of the through hole in the insertion direction. On the other hand, a housing groove for a resin adhesive impregnated body having a predetermined width and having a tapered surface that is shallow at the front and deep at the rear is formed.

A housing groove is formed in an outer peripheral portion of the duct sleeve opposite to the inner peripheral surface of the through hole, and a resin adhesive impregnated body is housed in the housing groove, and the impregnated body is covered with a net. It is characterized by doing so.

[0007] Further, the mesh body is pressed by an elastic body in the front of the duct sleeve in the insertion direction, and is fixed in the accommodation groove.

[0008]

According to the above construction, when the additional duct sleeve is inserted into the through hole, the resin adhesive impregnated body does not deviate from the accommodation groove, and the resin adhesive oozing out of the impregnated body is solidified at a predetermined position. The desired adhesion and waterproofness can be obtained.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 6, reference numeral 1 denotes an existing manhole provided underground, and a number of existing pipelines 2 for inserting communication cables and the like are laid between the manholes 1 and 1. The pipeline 2 is provided in a plurality of stages vertically and a plurality of rows in the horizontal direction. In addition to the existing pipeline 2, the manhole 1 is expected to be expanded in the future. A space 3 to be added is provided above the pipe 2.

When a duct expansion port is provided at the position of the space 3 to be expanded, a through hole 4 having a predetermined size is formed by an appropriate drilling tool (see FIG. 5). In this through hole 4,
The additional duct sleeve 5 shown in FIGS. 1 to 4 is fitted. The duct sleeve 5 is made of, for example, vinyl chloride. One end of the duct sleeve 5 is inserted into the through hole 4, and the joint 6 is formed on the other end. On the side of the additional duct sleeve 5 inserted into the through hole 4, a resin layer 7 is coated on the outer periphery of the length of the through hole 4, that is, the length substantially corresponding to the thickness of the side wall 1 a of the manhole 1. Is being worn.
The resin layer 7 has an outer diameter substantially equal to the inner diameter of the through hole 4, and is made of four urethane rubbers, each of which has a phase shifted in the circumferential direction at two locations in the longitudinal direction on the outer circumference thereof. The resistance plates 8 and 9 are provided at equal intervals. The resistance plates 8, 9 protrude slightly outward from the surface of the resin layer 7, and the height, length, width, number, and the like thereof may be changed as appropriate. On the outer periphery of the resin layer 7 between the resistance plates 8 and 9, an impregnated body accommodating groove 10 having a predetermined width and having a tapered surface that is shallow in the front and deep in the rear in the insertion direction is formed.
A ring-shaped resin adhesive impregnated body 11 is accommodated in the housing.

The resin adhesive impregnated body 11 is covered with a net 12 such as a gauze in the accommodating groove 10.
One end of 2 is fixed by a flat iron wire 13 at a deep portion of the accommodation groove 10, and the other end extends toward the holding plate accommodation groove 14 provided on the front side in the insertion direction of the resin layer 7, where it is formed from a band-shaped rubber plate. The holding member 15 is pressed by
2a is adhered to an almost half position in the width direction of the holding plate 15 with an adhesive, and the remaining holding plate 15 is adhered to the holding plate accommodation groove 14 with an adhesive 16.

The resin layer 7 is applied to the duct sleeve 5 in advance, the resin adhesive impregnated body 11 is accommodated in the impregnated body accommodating groove 10, and the impregnated body 11 is covered with the mesh 12, Fixing by slanted iron wire 13, mesh tip 12a against holding plate 15 in holding plate receiving groove 14
The bonding of the holding plate 15, the bonding of the holding plate 15 to the accommodating groove 14 by the adhesive 16, the holding operation, the selection of the resistance plates 8, 9 and the like may be performed at the construction site.

In the construction as described above, in constructing the duct addition opening, first, as shown in FIG. 5, a through hole 4 is opened in the space 3 where the manhole 1 is to be added. Next, as shown in FIG. 1 to FIG.
And the resistance plates 8 and 9 are mounted on the outer periphery thereof, the resin adhesive impregnated body 11 is accommodated in the impregnated body accommodating groove 10, and the impregnated body 11 is further covered with the net 12. One end of the net body 12 is fixed by an annealing iron wire 13 at a deep portion of the accommodation groove 10, and the other end is extended to the holding plate accommodation groove 14 side, and the tip 12 a is bonded to the holding plate 15, and the holding plate 15 is attached. The adhesive 16 is adhered to the accommodation groove 14. Then, in this state, the joint portion 6 is inserted into the through hole 4 with the resistance plates 8 and 9 elastically deformed, and the ends are beaten with a wooden hammer or the like to insert the manhole 1 to the wall surface. In this state, the duct sleeve 5
The resin layer 7 is uniformly supported in the circumferential direction with respect to the through hole 4 by the resistance plates 8 and 9, and the duct sleeve 5 is stably and firmly supported.

Therefore, with the duct sleeve 5 inserted into the through hole 4, the pipe 2 such as a steel pipe or a vinyl chloride pipe is connected to the joint 6 of the duct sleeve 5 as shown in FIG. After the installation, the operation of inserting a communication cable or the like into the pipeline 2 can be continuously performed.

The resin adhesive impregnated body 11 accommodated in the impregnated body accommodating groove 10 has the accommodating groove 10 having the duct sleeve 5,
Since the tapered surface is formed such that the front is shallow and the rear is deep with respect to the direction in which the resin layer 7 is inserted into the through hole 4, the impregnating body 11 is formed by the deep groove at the rear when the duct sleeve 5 is inserted.
Is prevented, and the impregnated body 11 does not escape backward from the accommodation groove 10. Further, the impregnated body 11 is covered with a mesh body 12 on the outside, the front side of the mesh body 12 is adhered to the holding plate 15 in the holding plate housing groove 14 and held down, and the rear end of the mesh body 12 is held in the housing groove. 10 is fixed by the annealed iron wire 13 so that the impregnated body 11
Is formed by the expansion and contraction of the mesh body 12 and the holding plate 15.
It is kept without moving from. And the impregnated body 11
The resin adhesive impregnated in the resin is hardened over time at a predetermined position to firmly adhere the through hole 4 and the resin layer layer 7, and the cured impregnated body 11 prevents water from leaking into the manhole 1. You.

A rubber ring housing groove 17 shown in FIG. 7 is formed in place of the holding plate housing groove 14 and the holding plate 15, and the front end of the net 12 is housed in the housing groove 17 and a rubber band 18 is provided.
It may be made to be held down by pressing.

In this case, the pressing force of the rubber band 18 on the mesh body 12 is slightly inferior to the pressing plate 15 of the above embodiment, but it can be put to practical use.

[0018]

As described above, according to the duct sleeve for additional manhole opening of the present invention, the following effects can be obtained.

Since the impregnated body accommodating groove having a predetermined width is formed on the outer periphery of the duct sleeve and has a tapered surface that is shallow in the front and deep in the rear with respect to the insertion direction of the duct sleeve, the duct sleeve is inserted into the through hole. At this time, the movement of the impregnated body is prevented by the deep groove surface and the resin adhesive is cured in a state of being housed in the housing groove, and the duct sleeve is securely bonded to the through hole. Further, since the impregnated body is hardened at a predetermined position, water leakage from the outer periphery of the duct sleeve into the manhole is prevented.

Since the resin adhesive impregnated body accommodated in the accommodating groove is covered with the net, the impregnated body is prevented from moving from the accommodating groove by the expansion and contraction of the net when the duct sleeve is inserted into the through hole. be able to. Therefore, the impregnated body is hardened at a predetermined position to adhere the duct sleeve to the through hole, and also exhibits a waterproof effect.

Since the mesh body is pressed by the elastic body in the front of the duct sleeve in the insertion direction and is fixed in the accommodation groove, the mesh body and the elastic body expand and contract when the duct sleeve is inserted into the through hole. It is possible to more reliably prevent the impregnated body from moving from the accommodation groove. Further, the mesh body can withstand friction when the duct sleeve is inserted into the through hole, and can protect the resin adhesive impregnated body.

[Brief description of the drawings]

FIG. 1 is a half sectional side view of an additional duct sleeve of the present invention.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

FIG. 3 is a view taken in the direction of arrow B in FIG. 1;

FIG. 4 is an enlarged sectional view of a main part.

FIG. 5 is a side sectional view showing a state in which the additional duct sleeve of the present invention is inserted into a through hole formed in a manhole.

FIG. 6 is a schematic side view of a piping state of an existing manhole.

FIG. 7 is a partial cross-sectional view of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Pipe line 3 Space to be added 4 Through hole 5 Duct sleeve 6 Joint part 7 Resin layer 8,9 Resistance plate 10 Impregnated body accommodating groove 11 Resin adhesive impregnated body 12 Net 13 Annealed iron wire 14 Pressing plate accommodating groove 15 Holding plate 16 Adhesive 17 Rubber band accommodation groove 18 Rubber band

Continuing on the front page (72) Inventor Mitsuru Takahashi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Keiji Somegawa 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Stock In-house (56) References JP-A-2-311120 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16L 41/02 E02D 29/12 F16L 5/02

Claims (3)

(57) [Claims] A through hole is provided at a predetermined portion of an existing underground structure such as a manhole, and a duct extension port through which a communication cable or the like is inserted is inserted from the inside of the manhole to the outside. In the duct sleeve for an additional opening to be inserted and fixed to a manhole, the duct sleeve has a tapered surface formed on the outer peripheral portion facing the inner peripheral surface of the through-hole so that the front is shallow and the rear is deep in the insertion direction. A duct sleeve for an additional opening of a manhole, wherein a receiving groove for a resin adhesive impregnated body having a width is formed. 2. A housing groove is formed in an outer peripheral portion of the duct sleeve facing the inner peripheral surface of the through hole, and a resin adhesive impregnated body is housed in the housing groove, and the impregnated body is encapsulated by a net. The duct sleeve for an additional opening of a manhole according to claim 1, wherein 3. The manhole extension opening according to claim 1, wherein the mesh body is pressed by an elastic body in the front of the duct sleeve in the insertion direction and fixed in the accommodation groove. Duct sleeve.