JP2001152472A - Connecting seal material for pipe line and manhole, and connecting method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting seal material for a pipe line and a manhole, and the sealing method therefor capable of easily expanding a circular tube to obtain a sealing action without the need for special reinforcement. SOLUTION: The connecting seal material is constituted of a hollow circular tube 6 and an expandable resin 9 injected in the circular tube 6. The circular tube 6 is expanded by the expanding pressure of the expandable resin 9 to seal the gap between the pipe line 4 and the manhole 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material for joining a pipe and a manhole and a joining method.

[0002]

2. Description of the Related Art Conventionally, in sewer pipes and the like, manholes are formed at regular intervals in the middle of a pipeline. The structure of the joint between the pipe and the manhole is shown in FIG.
Joint hole 10 formed in side wall 101 of manhole 100
2, the terminal 103 a of the pipe 103 is inserted into the pipe 1.
In a gap between the terminal portion 103a of FIG. 03 and the joining hole 102, a sealing material 104 for joining is used for sealing.

[0003] A thick annular rubber tube is used as the joining sealing material 104, and the annular rubber tube is connected to the end portion 103 a of the conduit 103 and the manhole 100.
By inserting a curable resin liquid into an annular rubber tube and hardening it, the rubber tube is placed between the outer surface of the conduit 103 and the manhole 100 by the pressure of the resin liquid. The inner surface of the joining hole 102 was pressed into contact with the inner surface of the joining hole 102, and the space between the two was sealed watertight.

According to such a conventional sealing material 104 for bonding, it is necessary to increase the pressure of the resin liquid in order to maintain a high degree of watertightness. Therefore, when the pressure of the resin liquid injected into the rubber tube is increased to apply an internal pressure to the rubber tube, the outer peripheral surface and the inner peripheral surface of the rubber tube are swelled by being pressed against the joining hole 102 and the conduit 103 of the manhole 100. Is suppressed, but there is no means for suppressing deformation on the side surface of the rubber tube. As a result, when high pressure is applied within the rubber tube, the rubber tube may bulge laterally and burst. In addition, a sufficient sealing effect could not be obtained if the pressure of the resin solution was reduced so that the rubber tube was not excessively deformed.

FIGS. 6 and 7 show an expansion tube 106 inside a water-stopping rubber-like tube 105 in order to prevent the above-mentioned problem of the conventional sealing material 104 bulging out and exploding. Inserted connector 107
(Japanese Unexamined Patent Publication No. 7-82761).
The inflation tube 106 is a tube in which a tubular woven fabric 109 is disposed outside a tube 108 made of a flexible thin rubber or synthetic resin.

According to the joint 107, first, the air in the inflation tube 106 of the joint 107 is evacuated and deflated and fitted inside the joint hole 102 of the manhole 100. The terminal 103a of the conduit 103 is inserted into the inside of the pipe 103. From this state, the resin liquid injection valve 110
, A curable resin liquid is injected into the expansion tube 106 to inflate the water-stopping rubber-like tube 105 via the expansion tube 106. At this time, the air in the expansion tube 106 flows out of the air vent valve 111.

Thus, the terminal 103a of the conduit 103 and the manhole 10 in the water-stopping rubber-like tube 105
The pressure of the resin liquid acts on the portion in contact with the bonding hole 102 from the inside via the expansion tube 106, and this pressure causes the terminal 103 a of the conduit 103 and the manhole 1.
No. 00 is pressed into the joint hole 102, and a sufficient sealing action is produced. On the other hand, on the side surface of the joint 107, the pressure toward the side of the resin liquid is applied to the tubular fabric 1 of the expansion tube 106.
09 so that the inflation tube 106 does not expand excessively laterally. Therefore, since the pressure of the resin liquid does not directly act on the water-stopping rubber-like tube 105, the water-stopping rubber-like tube 105 does not excessively expand and deform to the side, and does not rupture. Absent.

[0008]

However, according to the above-mentioned prior art connector 107, the expansion tube 106 must be provided inside the water-stopping rubber-like tube 105, and the expansion tube 106 is flexible. A tubular woven cloth 109 is placed outside the thin-walled rubber or synthetic resin tube 108.
Must be installed. Therefore, the structure becomes complicated, and it becomes difficult to manufacture the connector 107. Further, since a special device is required for press-fitting the resin liquid, it is difficult to manage the resin at the construction site.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and a sealing material and a joining method for a pipe line and a manhole capable of easily expanding the annular tube and obtaining a sealing function without requiring special supply of the annular tube. The purpose is to provide.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a hollow annular tube and a foamable resin injected into the annular tube. The tube is inflated between the conduit and the manhole to seal between the conduit and the manhole. Further, according to the present invention, the end of the conduit is loosely fitted into the joint hole provided in the manhole, and a hollow annular tube is disposed between the joint hole and the end of the conduit, and the inside of the annular tube is provided. The foamable resin is injected, the foamable resin is foamed in the annular tube, and the annular tube is expanded between the pipe and the manhole by the foaming pressure of the foamable resin to form a gap between the pipe and the manhole. Is to seal.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a cross-sectional view showing a use state of a sealing material for joining, FIG. 2 is a partially enlarged cross-sectional view of FIG.
FIG. 3 is a side view showing the sealing material for bonding, and FIG.
FIG. 3 is a sectional view taken along line A.

In FIGS. 1 and 2, reference numeral 1 denotes a manhole provided in the middle of a sewer pipe or the like, and a side wall 2 of the manhole 1 has a joint hole 3 formed therein. Reference numeral 4 denotes a conduit inserted into and joined to the joint hole 3 of the manhole 1, and the conduit 4 is arranged by inserting the terminal portion 4a into the joint hole 3 of the manhole 1 with a slight inclination. Reference numeral 5 denotes a joining sealing material for joining the terminal portion 4a of the conduit 4 to the joining hole 3 of the manhole 1. The inside of the joining sealing material 5 is formed of an annular tube 6 having a hollow 6a, and is formed of a thick elastic material such as rubber.

The joining sealing material 5 is shown in FIGS.
As shown in FIG. 3, the cross-sectional shape of the inside of the annular tube 6 is formed in an oval shape of the hollow 6a.
A plurality of (three in the illustrated example) trapezoidal ridges 6b and 6c having a trapezoidal cross section are formed along the circumferential direction on the outer peripheral surface side and the inner peripheral surface side, respectively. A resin injection hole 7 and an air vent hole 8 are formed on the side surface of the joining sealing material 5. A foamable resin 9 is injected into the hollow 6 a of the annular tube 6 from the resin injection hole 7 and foamed and solidified. Ring tube 6
Is inflated to seal between the joint hole 3 of the manhole 1 and the terminal portion 4a of the pipe 4.

The joint sealing material 5 at the joint between the pipe 4 and the manhole 1 is generally used at a compression ratio of about 20 to 30%. In this case, the joining sealing material 5 is used.
Compressive force acting on the 1.5kg / cm ² ~3kg / cm ²
It is about. The greater the compressive force acting on the water-stopping rubber, the greater the water-stopping effect, but the more difficult it is to join the pipe line 4 and the manhole 1 at the time of joining. In addition, since the dimensional accuracy of the drilled portion of the pipeline 4 and the manhole 1 is poor,
In many cases, a predetermined compression force cannot be obtained. The foaming resin 9 used in the present invention has a foaming pressure of 1 kg / cm ² to 3 kg / c.
order to have about ² m, when the junction between the conduit 4 and the manhole 1, facilitates the bonding operation the compressive force acting on the hollow annular tube 6 before injecting the foamable resin 9 as about 0~1kg / cm ² to, then a predetermined pressure 1.5kg / cm ² ~3kg / cm ² required degree foamable resin 9 in water stop for can be given as foaming pressure within the annular tube 6, complete water stopping can be achieved . In addition, foamable resin 9
Since the expansion ratio can be controlled in advance so that a predetermined foaming pressure is obtained, no work such as press-fitting is required at the time of injection. Furthermore, since the foamable resin 9 hardens while foaming, the hollow annular tube 6 does not require special reinforcement for preventing rupture. Since the foamable resin 9 rapidly foams and hardens within a predetermined time after the injection, a special curing period after the joining operation is not required. Further, after curing, it has an elastic force like rubber, so that it has an integral structure with the hollow annular tube 6, and since it has excellent elastic force, it becomes a joining material excellent in earthquake resistance.

Next, a method of joining the end portion 4a of the pipe 4 to the joining hole 3 of the manhole 1 using the joining sealing material 5 having the above-described structure will be described. Joint hole 3 of manhole 1
Then, the terminal 4a of the pipe 4 is inserted, and the joining sealing material 5 is fitted to the terminal 4a of the pipe 4. Then, the foamable resin 9 is injected from the resin injection hole 7 into the hollow 6 a of the annular tube 6 of the joining sealing material 5. The foamable resin 9 expands while foaming, and the annular tube 6 is pressed against the inner surface of the joint hole 3 of the manhole 1 and the outer surface of the terminal portion 4a of the conduit 4 by the foaming pressure to seal each other. Since the foamable resin 9 quickly cures while foaming, no reinforcement is required to prevent the annular tube 6 from bursting. Since the foamable resin 9 has a low viscosity before curing, a special device such as a pressure pump is not required for the injection, and the injection can be easily performed using a commercially available civilian sealant injection device. The foamable resin 9 has excellent elasticity after hardening, has no problem such as rupture even when an abrupt load is applied during an earthquake or land subsidence, and has excellent earthquake resistance.

The present invention is not limited to the above embodiment. For example, as the sealing material 5 for joining, the outer circumferential surface and the inner circumferential surface of the annular tube 6 are respectively arranged along the circumferential direction. Although a plurality of trapezoidal ridges 6b and 6c each having a trapezoidal cross section were used, the shape of the ridges 6b and 6c was as follows.
The shape is not limited to the trapezoidal shape, and may be a semicircular shape. The thickness of the joining sealing material 5 is not particularly limited as long as it is a thickness that can be expanded by foaming of the foamable resin 9. Further, the diameter of the joining sealing material 5 can be appropriately selected and implemented as long as it can be pressed against the inner surface of the joining hole 3 of the manhole 1 and the outer surface of the terminal portion 4a of the pipe 4 due to the foaming of the foamable resin 9. The foaming resin to be used can be used regardless of the one-component type or the two-component type as long as the expansion ratio expands from 1.2 to 4 times. It is desirable to use a resin that has low viscosity and good workability at the time, and hardens in a short time after injection. Urethane,
Vinyl chloride, various synthetic rubbers, acrylics, polyester resins and the like can be used, but a two-component urethane resin is preferred in terms of curability control and physical properties.

Known methods for foaming the resin include a method of adding a low boiling point solvent such as methylene chloride, pentane, hexane, heptane, and freon and heating, and a method of generating a gas during the reaction. In the case of a urethane resin, there is a method of utilizing carbon dioxide gas generated by a reaction between isocyanate and water at the time of curing, and the use of a two-component urethane resin is preferred from the viewpoint of controlling the foaming state. In the case of urethane resin, both the curing reaction and foaming of the resin can be controlled by appropriately selecting the catalyst to be used and adjusting the amount of water.

(Example) Foamable resin A two-component urethane resin having the following composition was used. Main agent (terminal isocyanate group-containing prepolymer): AX-565 (NCO% = 6.5), curing agent manufactured by Mitsui Chemicals, Inc. (active hydrogen group-containing mixed resin) parts by weight ・ Diethylenetoluenediamine (DETDA) See Table 1. -PPG MN-4000 (glycerin-based molecular weight: 4000), manufactured by Mitsui Chemicals, Inc. 3.0-Dioctyl phthalate (DOP) See Table 1-L-5421 (silicone foam stabilizer), manufactured by Nippon Konica Corporation 1-Heavy Calcium carbonate 25-Lead octylate (25% solution) 0.3-Kaolyzer No. 3 (foaming catalyst), manufactured by Kao Corporation 0.2-Water See Table 1

[0019]

[Table 1] Expansion ratio : A value obtained by mixing and curing a main component and a curing agent at the composition ratios shown in the table, measuring the volume of the cured product, and dividing the volume by the total value of the volumes of both components before the reaction. Foaming pressure : After mixing the main agent and the curing agent at the composition ratios shown in the table,
480 g of the mixture was poured into a mold having a size of W20 cm × D12 cm × H2 cm, which was fixed with a lid fitted with a diaphragm pressure sensor (GDC-10 manufactured by Orientic), and the maximum value of the internal pressure was measured. Shrinkage : The cured product was taken out and allowed to stand for one month before observing the degree of shrinkage. Examples 1, 2 and 3 Using a two-part static gun, a main agent and a curing agent having the composition ratios shown in Table 1 were used: main agent / curing agent = 1/1 (volume ratio).
And the mixture was injected into a rubber tube. The mixture foamed in the rubber tube, and the tube expanded due to the foaming pressure, and a state was established in which the space between the pipe and the manhole could be sufficiently sealed. After curing, the cured product was taken out, left for one month, and the degree of shrinkage was observed. As a result, there was no change in the cured product, and it was possible to maintain the water stopping function for a long period of time.

When a water pressure test was conducted, as shown in Table 2, when the foaming pressure of the foamable resin was 1.8 kg / cm ² or more, it was superior to the conventional product.

[0021]

[Table 2]

In Example 1, since the foaming pressure of the foamable resin was small, there was no problem at a water pressure of 1 kg / cm ² , but some water leakage was observed at a water pressure of 2 kg / cm ² .
In the conventional product, a small amount of water leakage was observed at a water pressure of 2 kg / cm ² because the dimensional accuracy of the drilled portion of the manhole was poor.

Comparative Example 1 A mixture was injected into a rubber tube in the same manner as in Example. Since the mixture was non-foamed, the seal between the pipe and the manhole became incomplete, and the water stopping function was not sufficiently provided. Comparative Example 2 A mixture was injected into a rubber tube in the same manner as in Example. After curing, the cured product was taken out and left for one month, and the degree of shrinkage was observed. As a result, the cured product was shrunk, and it was difficult to maintain the water stopping function for a long period of time.

[0024]

As described above, the following effects can be obtained by the sealing material and the method for joining a pipe and a manhole according to the present invention. The tube according to claim 1, comprising a hollow annular tube and a foamable resin injected into the annular tube, wherein the annular tube is expanded between a conduit and a manhole by a foaming pressure of the foamable resin. Since the space between the road and the manhole is sealed, the foamable resin quickly cures while foaming, and thus does not require reinforcement for preventing the annular tube from bursting. Since the foamable resin has a low viscosity before being cured, it does not require a special device such as a pressure pump, and can be easily filled with a commercially available civilian sealant injection device. The foamable resin has excellent elasticity after curing, has no problem such as rupture even when an abrupt load is applied during an earthquake or land subsidence, and has excellent earthquake resistance. In claim 2, the end of the conduit is loosely fitted in the joint hole provided in the manhole, and a hollow annular tube is disposed between the joint hole and the end of the conduit, and foam is formed in the annular tube. The foamable resin is foamed in the annular tube by injecting a foamable resin, and the annular tube is expanded between the pipe and the manhole by the foaming pressure of the foamable resin, thereby forming a gap between the pipe and the manhole. Since the sealing is performed, the foamable resin is quickly cured while foaming, and thus does not require reinforcement for preventing the annular tube from bursting. Since the foamable resin has a low viscosity before being cured, it does not require a special device such as a pressure pump, and can be easily filled with a commercially available civilian sealant injection device. The foamable resin has excellent elasticity after curing, has no problem such as rupture even when an abrupt load is applied during an earthquake or land subsidence, and has excellent earthquake resistance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a usage state of a bonding seal material according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a side view showing the bonding seal material of FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a cross-sectional view illustrating a conventional method of joining a pipe and a manhole.

FIG. 6 is a perspective view showing a conventional water-stopping rubber-like tube.

FIG. 7 is a cross-sectional view showing a conventional water-stopping rubber-like tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Side wall 3 Joining hole 4 Pipe line 5 Joining sealing material 6 Annular tube 7 Resin injection hole 8 Air vent hole 9 Foamable resin

Continuing on the front page (72) Inventor Takayuki Suzuki 5-33-11 Shimbashi, Minato-ku, Tokyo Inside Japan Hume Pipe Co., Ltd. (72) Inventor Kaoru 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Chemicals (72) Inventor Michio Sekine 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa F-term (reference) 2D047 BA27 2D063 DA24 DA28 3J040 BA03 EA03 EA16 EA25 FA08 HA03

Claims (2)

[Claims] 1. A tube formed by a hollow annular tube and a foamable resin injected into the annular tube, wherein the annular tube is expanded between a conduit and a manhole by a foaming pressure of the foamable resin. A sealing material for joining a pipe and a manhole, wherein a seal is provided between the passage and the manhole. 2. An end of a conduit is loosely fitted into a joint hole provided in a manhole, and a hollow annular tube is disposed between the joint hole and the end of the conduit. The foamable resin is foamed in the annular tube by injecting a foamable resin, and the annular tube is expanded between the pipe and the manhole by the foaming pressure of the foamable resin, thereby forming a gap between the pipe and the manhole. A method of joining a pipe and a manhole, characterized by sealing.