JP3930746B2 - Embedded pipe sealing device and sealing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an embedded pipe sealing device and a sealing method represented by, for example, a manhole vertical pipe and a horizontal pipe.
[0002]
[Prior art]
In the technical field of sewage structures buried underground, various methods are conventionally known as means for sealing and connecting a horizontal pipe to a manhole vertical pipe.
Among these, dry-type sealing devices that do not require the application of adhesives and mortar in the field have already been developed, and such sealing devices include a seal ring made of a rubber material having a hollow cross section and an endless ring shape. And a filler for expanding the cross-sectional diameter of the ring by being filled in the cross-section of the seal ring, and the seal ring is interposed in a ring-shaped joint space formed between the buried pipes In this state, the joint space is sealed by pumping a filler into the cross section of the ring (for example, Japanese Patent No. 2911148, Japanese Patent Laid-Open No. 9-302692, and US Pat. 42269419).
[0003]
In such a dry seal device, as a filler filled in the cross section of the seal ring, high-viscosity grease, liquid rubber (for example, silicon rubber), or high water absorption that is stored in advance in the seal ring. Water that swells a polymer (for example, polyacrylamide) is employed.
[0004]
[Problems to be solved by the invention]
The conventional sealing device uses a filler made of a material that does not harden over time and is permanently fluid, so that it is buried due to vibrations that occur in the buried pipe during backfilling. Even if the pipes are eccentric and the radial width of the ring-shaped joint space is locally deformed, the filler flows in the circumferential direction of the seal ring so as to go around the portion where the radial width is widened, and the joint space There is an advantage that it is possible to prevent occurrence of local seal failure in
[0005]
However, when such a filler whose fluidity is permanently maintained is used, there is an advantage as described above, but if the seal ring as the outer skin is damaged (punctured) due to fatigue or deterioration, The filler inside the cross section leaks to the outside and the seal ring contracts, which may fundamentally hinder the seal performance of the seal ring. In this respect, the seal performance after construction is maintained for a long time. There is a drawback that you can not.
Therefore, as a means for solving the above drawbacks, a liquid rubber (silicone rubber) is mixed with a curing agent to be modified into an elastic solid material having a predetermined rubber hardness, thereby eliminating the fluidity of the filler after construction and sealing. It is conceivable to prevent ring puncture.
[0006]
However, in this case, if the liquid rubber is hardened before the buried pipe is backfilled, the buried pipes are eccentric due to vibrations generated in the buried pipe during the backfilling, and the radial width of the ring-shaped joining space is reduced. When locally deformed, the filler that has already been modified into an elastic solid material will not flow in the circumferential direction of the seal ring, and it is not possible to fill the gap that has become large due to the eccentricity of the buried pipes, There is a risk of local seal failure immediately after construction.
In view of such a situation, the present invention does not cause local seal failure due to eccentricity between connecting pipes during construction, and finally the seal ring becomes punctureless, so that the short-term immediately after construction. An object of the present invention is to provide a buried pipe sealing device and a sealing method capable of improving both the sealing performance and the long-term sealing performance after a long period of time has elapsed since the completion of construction.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following technical means.
That is, the present invention relates to a seal for a buried pipe comprising a rubber seal ring having a hollow cross section and an endless ring shape interposed in a joining space formed by the buried pipes, and a filler that is pumped into the cross section. In the apparatus, as the filler, a rubber material having a self-hardening property in which the curing timing is set so that the curing completion timing is after the backfilling timing of the buried pipe is employed.
[0008]
In order to seal the buried pipes using such a sealing device, the seal ring is interposed in a joint space formed by the buried pipes, and the curing timing is set as described above in the cross section of the seal ring. The filler is made of a rubber material having self-hardness, and the cross-sectional diameter of the seal ring is expanded to seal the joining space, and then the buried pipe is backfilled.
In this case, the filler made of a self-hardening rubber material is set at the above-described curing timing, so that the fluidity of the filler remains maintained during the backfilling operation of the buried pipe. For this reason, even if the buried pipes are eccentric due to vibration or the like generated in the buried pipe during the backfilling, and the radial width of the joint space is locally deformed, the filler is removed from the portion where the radial width is narrowed. It flows in the circumferential direction of the seal ring so as to wrap around the expanded portion, and local seal failure does not occur in the joint space, and short-term seal performance immediately after construction is effectively ensured.
[0009]
In addition, since the filler made of a rubber material having self-hardening properties is changed into an elastic solid material after the buried pipe has been back-filled, the filler can be used even if the seal ring constituting the outer shell is damaged due to fatigue or deterioration. Does not leak to the outside, and the seal ring becomes punctureless. For this reason, even after a long period of time has elapsed since the completion of construction, the sealing performance by the seal ring is effectively maintained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 3 shows a sewage device 4 including a dry seal device 1 of the present embodiment and a manhole vertical tube 2 and a horizontal tube 3 connected to each other through the dry seal device 1. As shown in FIGS. 1 and 2, the sewage device 4 of the present embodiment includes a manhole vertical pipe 2 installed in a vertical direction on an installation foundation 6 constructed on an excavated ground 5, and a side of the manhole vertical pipe 2. It is comprised from the sideways horizontal tube 3 connected to a part.
[0011]
Among these, the manhole vertical pipe 2 is formed of a cylindrical body made of precast concrete having an inner diameter enough to allow a person to enter, and is a circular joint that is cut to have an inner diameter slightly larger than the outer diameter of the horizontal pipe 3. A hole 7 is provided in the outer peripheral wall. Further, the horizontal tube 3 is made of a precast concrete cylindrical body having an outer diameter slightly smaller than that of the joining hole 7. Although not shown, an invert made of spot cast concrete or precast concrete is installed at the bottom of the manhole vertical pipe 2.
The sealing device 1 of the present embodiment has a seal ring 9 made of a rubber material having a hollow cross section and formed in an endless ring shape, and the cross section of the ring 9 is expanded by filling the inside of the cross section of the seal ring 9. And a ring-shaped joining space S formed between the vertical pipe 2 and the horizontal pipe 3 (the gap between the inner peripheral surface of the joint hole 7 and the outer peripheral surface of the horizontal pipe 3). ) With the seal ring 9 interposed therebetween, and the filler 10 is pumped into the cross section of the ring 9 so as to seal the joining space S, so-called dry type.
[0012]
As shown in FIG. 3, the seal ring 9 is made of an endless ring-shaped rubber tube having a substantially hollow elliptical cross-sectional shape and having a diameter substantially the same as the diameter of the horizontal tube 3. An anti-slip ridge 11 is provided. In addition, an injection pipe 12 serving as an introduction port for injecting the filler 10 into the cross section is inserted in the middle portion of the seal ring 9 in the circumferential direction. An air hole 13 for venting air when the filler 10 is injected is formed on the opposite side.
[0013]
And in the sealing device 1 of this embodiment, as the filler 10, the rubber material having self-hardening whose curing timing is set so that the curing completion timing is after the backfilling timing of the manhole vertical tube 2 and the horizontal tube 3 Is adopted. As the rubber material that can be set at such a curing timing, for example, “Samprene E” (trade name) manufactured by Sanyo Chemical Industries, Ltd. is available as a urethane material. This product is cured by mixing a curing agent or a catalyst with a urethane-based main rubber, and the curing timing can be changed by changing the blending ratio thereof.
[0014]
In the case of silicon-based materials, for example, there is “two-component RTV rubber” (trade name) manufactured by Shin-Etsu Chemical Co., Ltd. This product is cured by mixing a curing agent or a catalyst with a silicon-based main rubber, and the curing timing can be changed by changing the blending ratio thereof.
Next, a method for sealing a buried pipe when using the sealing device 1 having the above configuration will be described with reference to FIGS. 1 and 2. In the construction examples shown in FIG. 1 and FIG. 2, an excavation method in which the sewage device 4 is installed on the excavated ground 5 is adopted.
[0015]
First, as shown in FIG. 1A, a seal ring 9 is wound around the joint end of the horizontal tube 3 in advance, and in this state, the joint hole 7 of the manhole vertical tube 2 erected on the installation base 6. The joint end portion of the horizontal tube 3 is inserted through. Thereafter, the joint end of the horizontal tube 3 is centered with respect to the joint hole 7 to form a ring-shaped joint space S therebetween, and the seal ring 9 extends over the entire circumference of the joint space S. To fit.
1B, the discharge hose 15 of the manual pump 14 is connected to the injection pipe 12 of the seal ring 9, and the filler 10 stored in the container 16 is sealed by the pump 14. The ring 9 is inflated by being pumped into the cross section 9 and the joining space S is sealed. The pumping of the filler 10 to the seal ring 9 may be stopped when the filler 10 leaks from the air hole 13 of the ring 9, and then the air hole 13 is sealed.
[0016]
As shown in FIG. 2, the manhole vertical tube 2 and the horizontal tube 3 whose joints are sealed as described above are backfilled by a construction machine such as a backhoe 17, thereby completing a series of construction.
At this time, according to the sealing device 1 of the present embodiment, since the filler 10 made of a self-hardening rubber material is set at the above-described curing timing, the manhole vertical tube 2 and the horizontal tube 3 are refilled. In some cases, the fluidity of the filler 10 is still maintained.
[0017]
For this reason, during the above-described backfilling operation, the horizontal tube 3 is eccentric with respect to the joint hole 7 of the vertical tube 2 due to vibrations generated in the vertical tube 2 and the horizontal tube 3, and the diameter of the joint space S is reduced. Even if the direction width is locally deformed, as shown by an arrow in FIG. 2, the filler 10 flows in the circumferential direction of the seal ring 9 so as to wrap around from the narrowed portion in the radial direction to the widened portion. There is no occurrence of local sealing failure in the joining space S, and short-term sealing performance immediately after construction is effectively ensured.
On the other hand, since the filler 10 made of a self-hardening rubber material is denatured into an elastic solid material after the above-described backfilling operation is completed, even if the seal ring 9 constituting the outer skin is damaged due to fatigue, deterioration, or the like. The filler 10 does not leak to the outside, and the seal ring 9 becomes punctureless. For this reason, the sealing performance by the seal ring 9 is effectively maintained even after a long period of time has elapsed since the completion of construction.
[0018]
FIG. 4 shows another sealing method using the sealing device 1 of the present invention.
In the construction example shown in FIG. 4, the horizontal horizontal pipe 3 that has been forcibly propelled in the ground 19 with a jack or the like is connected to the manhole vertical pipe 2 in the vertical hole 21 surrounded by the sheet pile 20. The construction method is adopted. In such a propulsion method, a work space cannot be secured outside the manhole vertical tube 2, so that the operator installs the sealing device 1 at the bottom of the manhole vertical tube 2.
That is, the worker enters the manhole vertical pipe 2 installed inside the vertical hole 21, and at the bottom of the vertical pipe 2, the pipes are centered, the work for interposing the seal ring 9 in the joining space S, and the filler 10. The pumping work is performed. In addition, after completion | finish of this sealing construction, earth and sand are thrown into the inside of the vertical hole 21, and the connection part of the manhole vertical pipe 2 and the horizontal pipe 3 will be refilled.
[0019]
Even in the case of this propulsion method, the manhole vertical pipe 2 is inclined due to insufficient rolling pressure of the base portion 22 of the vertical hole 21 or horizontal earth pressure from the earth and sand buried in the vertical hole 21. Then, the horizontal tube 3 may be eccentric with respect to the connection hole 7.
Accordingly, even when dry sealing is performed by the sealing device 1 when the propulsion method is performed, by adopting the filler 10 whose curing timing is set after the backfilling time, the eccentricity at the time of backfilling is achieved. It is meaningful to prevent the accompanying seal failure.
[0020]
The present invention is not limited to the above embodiment.
For example, the pressure-feeding operation of the filler 10 can be performed not only by the manual pump 14 but also by a compressor.
Moreover, the sealing device 1 of the present invention can be applied not only to the connection between the vertical tube 2 and the horizontal tube 3 but also to the connection between the vertical tubes 2 and the connection between the horizontal tubes 3.
Further, the sealing device 1 can be widely applied to dry-type seal joining between pipe members embedded in the ground, and the application target is not limited to the sewage device 4.
[0021]
【The invention's effect】
As described above, according to the present invention, there is no local seal failure due to the eccentricity of the connecting pipes during construction, and the seal ring eventually becomes punctureless. It is possible to improve both the short-term sealing performance and the long-term sealing performance after a long period of time has elapsed since the completion of construction.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a construction procedure of a buried pipe sealing method using a sealing device of the present invention, wherein (a) is a step of connecting a horizontal pipe to a manhole vertical pipe, and (b) is a joint of both pipes. The process which pumps a filler to the seal ring interposed in space is shown.
FIG. 2 is a schematic view showing a construction procedure of the sealing method, showing a backfilling process of both pipes.
FIG. 3 is an exploded perspective view of the sealing device of the present invention and a manhole vertical tube and a horizontal tube connected to each other through the sealing device.
FIG. 4 is a schematic view showing another sealing method using the sealing device of the present invention.
[Explanation of symbols]
1 Sealing device 2 Manhole vertical pipe (buried pipe)
3 Horizontal pipe (buried pipe)
4 Sewage device 9 Seal ring 10 Filler S Joining space

Claims (2)

A seal ring (9) made of a rubber material having a hollow cross-section and formed into an endless ring, and a filler for filling the inside of the cross-section of the seal ring (9) and expanding the cross-sectional diameter of the ring (9) (10), and the inside of the cross-section of the ring (9) with the seal ring (9) interposed in a joining space (S) formed by the buried pipes (2, 3) In the buried pipe sealing device that seals the joint space (S) by pumping the agent (10),
The buried pipe (10) is made of a rubber material having a self-hardening property whose curing timing is set so that the curing completion time comes after the backfilling time of the buried pipe (2, 3). Sealing device. A buried pipe sealing method including the following steps (a) to (c).
(A) A step of interposing a seal ring (9) made of a rubber material having a hollow cross section and an endless ring shape in a joining space (S) formed by the buried pipes (2, 3) (b) Filler (10) made of a rubber material having a self-hardening property in which the curing timing is set in the cross section of the seal ring (9) to be after the backfilling time of the buried pipe (2, 3). (C) The step of expanding the cross-sectional diameter of the seal ring (9) and sealing the joining space (S) by back-feeding the embedded pipe (2, 3)

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