JPH09302692A - Connecting seal structure of manhole and pipe body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily seal a pipe body by mounting a supplementary cylinder on the inside surface of the connecting hole of a manhole by a sealant, and inserting and connecting the pipe body to the supplementary cylinder through a seal packing. SOLUTION: A supplementary cylinder 11 formed of a short straight cylinder is mounted on the inside surface of the connecting hole 2 of a manhole 1 by a sealant 3 while keeping watertight state. The supplementary cylinder 11 is formed of a metallic pipe having an outer diameter slightly smaller than the inside diameter of the connecting hole 2. A pipe body 5 is inserted into the inner hole of the supplementary cylinder through a seal packing 21 and connected thereto. The seal packing 21 is formed of an annular pedestal part 22 laid along the inside surface of the supplementary cylinder 11, and an elastic seal part 23 having a hollow closed section protruded to the inside surface of the pedestal part 22, which are integrally formed. A pipe 24 for injecting a filler is provided in the hollow chamber 23a of the elastic seal part 23. A pair of protruding linear parts are provided opposite to each other on the inside surface of the elastic seal part 23. A highly adhesive sealing material 26 is stuck to the groove part formed by the protruding linear parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection seal structure for sealing and connecting a pipe with a connection hole of a manhole.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
In order to seal and connect the pipe body 105, which is mainly called a Hume pipe, to the connection hole 2 of the above, an annular seal packing 121 is attached to the outer peripheral surface near one end of the pipe body 105, and the manhole 101 of the manhole 101 is attached. The tube body 10 with respect to the connection hole 102
5, one end of the manhole 10 is inserted and the seal packing 121 is brought into close contact with the peripheral surface of the connection hole 102.
1 has a structure in which the tube body 105 is connected.

[0003]

By the way, in addition to the rectangular manhole whose plane shape is a quadrangle, the manhole 101 is
There is a round manhole whose plane shape is circular. The round manhole 101 has a tubular body 101 on its peripheral wall.
A connection hole 102 having a front shape and a circular shape for connecting the two is penetrated. The connection hole 102 is a round manhole 101.
The flat cross-section has an arc shape based on the flat cross-section of the peripheral wall portion. Therefore, when an annular seal packing 121 is attached to the outer peripheral surface near one end of the tubular body 105 and inserted into the connection hole 102 of the round manhole 101, a part 121 a of the seal packing 121 is formed in the connection hole 102. There is a case where it protrudes from the inner peripheral surface to the inside or the outside of the manhole 101, and the protrusion of the seal packing 121 causes a defective seal.

As shown in FIGS. 10 (A) and 10 (B), the manhole 101 is composed of vertically divided manhole divided bodies 101a and 101b, and the manhole divided bodies 101a and 101b straddle each other. Therefore, there is a structure in which the connection hole 102 is divided and formed. In such a split type manhole 101, an upper manhole segment 101b is opposed to a lower manhole segment 101a.
However, when they are combined with a slight displacement, the semicircular connection holes 102a and 102b which are respectively formed in these manhole divided bodies 101a and 101b to form the connection hole 102.
Since the center positions 01 and 02 are displaced to form the step portion 130, between the outer circumference of the seal packing 121 annularly attached to the outer peripheral surface of the tubular body 105 and the step portion 130 on the inner peripheral surface of the connection hole 102. There is also a problem in that a gap S is generated at the end, which causes a defective seal.

In view of the above-mentioned conventional problems, an object of the present invention is that the manhole has a round shape and the connecting hole has a flat cross-sectional shape of an arc, or a split type manhole has a step on the inner peripheral surface of the connecting hole. (EN) Provided is a connection seal structure for connecting a manhole and a pipe body, which is capable of reliably sealing and connecting the pipe body to the connection hole of the manhole without causing sealing failure even when there is a portion.

[0006]

In order to achieve the above object, the connection seal structure for connecting a manhole and a pipe body according to the invention of claim 1 seals and connects the pipe body to the connection hole of the manhole. In the connection seal structure of the above, a supplementary cylinder which is a short straight pipe is attached to the inner peripheral surface of the connection hole of the manhole by a sealing material, and a tubular body is inserted into the supplementary cylinder through a seal packing. It is characterized by being connected. Therefore, a supplementary tube which is a short straight tube is attached to the inner peripheral surface of the connection hole of the manhole by a sealing material, and the tubular body is inserted and connected to the supplementary tube through a seal packing, whereby the supplementary The gap between the cylinder and the tubular body is reliably closed by the seal packing.

The connection seal structure for connecting a manhole and a pipe according to the invention of claim 2 is the connection seal structure for connecting a manhole and a pipe according to claim 1, wherein the seal packing has an endless annular shape and is a supplementary cylinder. A pedestal portion that is adhered to the inner peripheral surface of the pedestal, and an elastic seal portion that is provided so as to integrally project from the inner surface of the pedestal portion and that expands when filled with a filler and that is in close contact with the outer peripheral surface of the tubular body It is characterized by Therefore, the seal packing is annularly adhered to the inner peripheral surface of the supplementary cylinder at the pedestal part, and after the tubular body is inserted into the supplementary cylinder, the elastic seal portion of the seal packing is filled with the filler. As a result, the elastic seal portion expands, whereby the elastic seal portion surely comes into close contact with the outer peripheral surface of the tubular body without a gap, so that defective sealing is surely prevented.

According to a third aspect of the present invention, there is provided a connection seal structure for connecting a manhole and a pipe body according to the first aspect, wherein the seal packing has an endless annular shape and one end of the pipe body. A pedestal portion that is adhered to the outer peripheral surface of the pedestal, and an elastic seal portion that protrudes integrally with the outer peripheral surface of the pedestal and that expands when filled with a filler and that adheres to the inner peripheral surface of the supplementary cylinder. It is characterized by having. Therefore, the seal packing is annularly adhered to the outer peripheral surface of the pedestal portion near one end of the pipe body, and the pipe body is inserted into the supplementary cylinder, and then the elastic seal portion of the seal packing is filled with the filler. As a result, the elastic seal portion expands, and thus the elastic seal portion surely comes into close contact with the inner peripheral surface of the supplementary cylinder without a gap, so that a defective seal is surely prevented.

A connection seal structure for connecting a manhole and a pipe according to a fourth aspect of the present invention is the connection seal structure for connecting a manhole and a pipe according to claim 1, 2, or 3, wherein the supplementary cylinder is formed of a metal cylinder. It is characterized by Therefore, since the supplementary cylinder is made of metal, the thickness of the supplementary cylinder can be made thin so that the inner diameter of the supplementary cylinder can be made closer to the inner diameter of the connection hole of the manhole. Can be connected.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1 to 5 show Embodiment 1 of the present invention.
Follow the instructions below. In the first embodiment, as shown in FIGS. 3 and 4, the manhole 1 has a round shape, and a peripheral wall portion of the manhole 1 is provided with a circular connecting hole 2 having a front shape. Then, as shown in FIG.
Has an arc-shaped plane cross-section based on the plane cross-section of the peripheral wall of the manhole 1.

On the inner peripheral surface of the connection hole 2 of the manhole 1, a short straight cylinder 11 is attached by a sealing material 3 such as a mortar caulking material in a watertight state. The supplementary cylinder 11 has an outer diameter slightly smaller than the inner diameter of the connection hole 2, and is formed of a metal pipe such as a steel pipe or a stainless pipe. The supplementary cylinder 1
The tubular body 5 is inserted and connected to the inner hole of 1 through the seal packing 21.

In the first embodiment, the seal packing 21 is made of an elastic material such as synthetic resin or rubber (eg, chloroprene rubber, EPDM, etc.). Further, as shown in FIGS. 1 and 2, the seal packing 21 includes a pedestal portion 22 that is annular along the inner peripheral surface of the supplementary cylinder 11, and a hollow that is provided so as to project on the inner peripheral surface of the pedestal portion 22. An elastic seal portion 23 having a closed cross section is integrally provided.

The elastic seal portion 23 has a hollow chamber 2
An injection valve 24 for injecting a filler such as liquid silicon or a foaming material into 3a is provided. Further, a pair of ridges 2 are provided on the inner peripheral (projecting side) surface of the elastic seal portion 23.
5 are provided opposite to each other, and a sealing material 26 having a high adhesiveness is adhered to the groove formed by the ridges 25.

The sealing material 26 includes unvulcanized butyl rubber alone, liquid butadiene rubber solidified, or unvulcanized butyl rubber mixed with elastic sponge rubber. Is used.

The first embodiment is constructed as described above. Therefore, when the pipe body 5 is sealed and connected to the connection hole 2 of the round manhole 1, the supplementary cylinder 1
The seal packing 21 is water-tightly bonded to the inner peripheral surface of the base 1 at its pedestal portion 22 with an adhesive. Although the work of adhering the seal packing 21 to the supplementary cylinder 11 can be performed at a pipe construction site, it can be easily performed in a factory.

Supplementary cylinder 1 provided with the seal packing 21
As shown in FIG. 5, 1 is inserted into the connection hole 2 of the round manhole 1 with a required insertion length. And
The sealing material 3 such as mortar or caulking material is filled in the gap between the outer peripheral surface of the supplementary cylinder 11 and the inner peripheral surface of the connection hole 2, and the sealing material 3 is solidified, so that the connection hole 2 is supplemented. The cylinder 11 is attached in a watertight state. After that, one end of the tubular body 5 is inserted into the supplementary cylinder 11 through the seal packing 21 by a required length. here,
Hollow chamber 23a of elastic seal portion 23 of seal packing 21
Filling agent 23b is injected from the injection valve 24 and filled. As a result, the elastic seal portion 23 expands and comes into close contact with the outer peripheral surface of the tubular body 5, whereby the connection hole 2 of the round manhole 1
A connection seal of the tube 5 to the is made.

In addition, in the first embodiment, based on the expansion of the elastic seal portion 23, the sealing material 26 having high adhesion on the inner peripheral side (protruding side) surface of the elastic seal portion 23.
Is pressed against the outer periphery of the tubular body 5 and comes into close contact therewith, which further enhances the sealing performance. As mentioned above,
By attaching the supplementary cylinder 11 which is a short straight tube to the connection hole 2 of the manhole 1, even if the connection hole 2 is a round manhole 1 having an arc-shaped cross section, unlike the conventional case,
It is possible to solve the problem that the seal packing 21 protrudes from the inner peripheral surface of the connection hole 2 and causes a sealing failure.

The connection seal structure for connecting the manhole and the tubular body according to the first embodiment configured as described above is not limited to the round manhole 1, but a square manhole 1 as shown in FIG.
Even can be adopted. In addition, FIG.
And, as shown in (B), the manhole 1 is composed of vertically divided manhole divided bodies 1a and 1b, and the connection hole 2 is formed between the manhole divided bodies 1a and 1b.
It can be adopted even if the structure is formed by dividing. Further, as shown in FIGS. 7A and 7B, both semicircular connection holes 2a of the upper and lower manhole divided bodies 1a, 1b,
Even when the center positions 01 and 02 of 2b are deviated and the step portion 30 is formed at the connecting portion of the inner peripheral surface of the connection hole 2, it is possible to cope with it by using the supplementary cylinder 11.

That is, when the step portion 30 is formed on the inner peripheral surface of the connection hole 2 of the manhole 1, the seal packing 21 is adhered to the inner peripheral surface of the supplementary cylinder 11 in advance, and the supplementary cylinder 11 is connected to the connection hole. It is inserted in 2 and attached by means of a sealing material 3. After that, as described above, after the tubular body 5 is inserted into the supplementary cylinder 11, the hollow chamber 23b of the elastic seal portion 23 of the seal packing 21 is filled with the filler and expanded, thereby Since the sealing material 26 of the elastic seal portion 23 is in close contact with the outer peripheral surface of the pipe body 5, the pipe body 5 is reliably sealed and connected to the connection hole 2 of the manhole 1 without causing a sealing failure.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 8. In the second embodiment, the seal packing 21 is bonded along the outer peripheral surface of the tubular body 5. The seal packing 21 is made of an elastic material, and has a ring-shaped pedestal portion 22 along the outer peripheral surface of the tubular body 5, and an inner portion protruding from the outer peripheral surface of the pedestal portion 22. Hollow elastic seal portion 2 having a hollow portion
3 are integrally provided. The elastic seal portion 23 includes
In the same manner as in the first embodiment, an injection valve 24 for injecting a filler into the hollow chamber is provided, and a pair of ridges 25 are provided on the outer peripheral side (projection side) surface of the elastic seal portion 23. The sealing material 26 having high adhesiveness is adhered to the groove formed by this.

Therefore, in the second embodiment, when the pipe body 5 is sealed and connected to the connection hole 2 of the manhole 1, the pedestal portion 22 of the seal packing 21 is bonded to the outer peripheral surface of the pipe body 5 near one end. It is watertightly adhered by the agent.
On the other hand, the supplementary cylinder 11 is inserted into the connection hole 2 of the manhole 1, and the sealing material 3 such as mortar or caulking material is provided in the gap between the outer peripheral surface of the supplementary cylinder 11 and the inner peripheral surface of the connection hole 2. By being filled and solidified, the supplementary cylinder 11 is inserted into the connection hole 2.
Is installed in a watertight state.

After that, one end of the tubular body 5 is inserted into the supplementary cylinder 11 through the seal packing 21 by a required length, and is filled in the hollow chamber 23a of the elastic seal portion 23 of the seal packing 21. By injecting and expanding the agent 23b, the sealing material 26 on the outer peripheral surface of the elastic seal portion 23 is pressed against the inner peripheral surface of the supplementary cylinder 11 and closely adheres thereto, whereby the pipe is inserted into the connection hole 2 of the manhole 1. The body 5 is reliably sealed and connected.

In the first and second embodiments, the hollow chamber 23a of the elastic seal portion 23 of the seal packing 21 is directly filled with the filler 23b to expand, but the present invention is not limited to this. is not. For example, a rubber tube may be provided inside the hollow chamber 23a of the elastic seal portion 23.

[0024]

As described above, according to the present invention,
Even if the manhole is a round manhole and the connection hole has a flat cross-sectional shape of an arc, or the manhole is composed of upper and lower split manhole bodies and there is a step on the inner peripheral surface of the connection hole, By attaching a supplementary cylinder, which is a short straight cylinder, to the connection hole of the manhole with a sealing material, the pipe body can be satisfactorily sealed and connected without a sealing failure.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a connection seal structure for connecting a round manhole and a tube body according to a first embodiment of the present invention.

FIG. 2 is a transverse sectional view showing the seal packing in an enlarged manner.

FIG. 3 is a plan cross-sectional view showing a connection seal structure of a round manhole and a pipe body, similarly.

FIG. 4 is a front view based on the line IV-IV of FIG.

FIG. 5 is a plan sectional view showing a state before inserting a tubular body into a connection hole of a round manhole.

FIG. 6 is a plan sectional view showing a state before inserting a tubular body into a connection hole of a rectangular manhole.

FIG. 7 is a front sectional view and a magnified view showing a state in which a pipe is connected to the connection hole of the split manhole.

FIG. 8 is an explanatory diagram showing a second embodiment of the present invention.

FIG. 9 is a plan sectional view showing a state in which a pipe body is connected to a connection hole of a conventional round manhole.

FIG. 10 is a front cross-sectional view showing a state in which a pipe is connected to a connection hole of a conventional split type manhole and an enlarged view thereof.

[Explanation of symbols]

 1 Manhole 2 Connection hole 3 Sealing material 5 Tubular body 11 Supplementary cylinder 21 Seal packing 22 Pedestal part 23 Elastic seal part

Claims (4)

[Claims] 1. A connection seal structure for sealing and connecting a pipe body to a connection hole of a manhole, wherein a supplementary cylinder which is a short straight tube is formed by a sealing material on an inner peripheral surface of the connection hole of the manhole. A connection seal structure for connecting a manhole and a pipe, wherein the pipe is inserted and connected to the supplementary cylinder through a seal packing. 2. The connection seal structure for connecting a manhole and a tube according to claim 1, wherein the seal packing has an endless annular shape, and a pedestal portion adhered to an inner peripheral surface of the supplementary cylinder, and an inner surface of the pedestal portion. A sealing structure for connecting a manhole and a tubular body, comprising: an elastic seal portion which is integrally projected to and expands by being filled with a filler and is brought into close contact with an outer peripheral surface of the tubular body. 3. The connection seal structure for connecting a manhole and a tubular body according to claim 1, wherein the seal packing has an endless annular shape, and a pedestal portion bonded to an outer peripheral surface near one end of the tubular body,
A manhole and a tubular body, comprising: an elastic seal portion that is integrally provided on the outer peripheral surface of the pedestal portion and expands by being filled with a filler, and that is in close contact with the inner peripheral surface of the supplementary cylinder. Connection seal structure with. 4. The connection seal structure for connecting a manhole and a tube according to claim 1, wherein the supplementary cylinder is made of metal.