JP3762017B2 - Wellhead water stop for manhole pipe side wellhead - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a water stop device that is provided at a wellhole on the side of a manhole pipe to prevent intrusion of earth, sand, water, etc. into the manhole pipe when a pipe such as a drainage pipe is pushed from the side of a submerged shaft manhole pipe About.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, work has been performed to connect a pipe by propelling a drain pipe or the like from a manhole toward a buried pipe. In such construction, a steel sheet pile driven into the shaft side is opened from the underground by burner cutting, and a water well for the steel sheet pile is attached to the well opening.
[0003]
A wellhead water stop for steel sheet piles has a circular rubber plate for preventing inflow of earth and sand, etc. at the time of piping construction superimposed on one surface of the annular flange, and a flange is attached to the hole in the steel sheet pile opened by cutting with a burner. Weld and bolt with an annular flange with a circular rubber plate in between. Thereafter, the pipe is propelled by a propulsion unit, and the pipe is laid so that the outer earth and sand and water do not enter the manhole by the circular rubber plate remaining on the outer periphery of the pipe penetrating the circular rubber plate.
[0004]
After laying the pipes, install concrete or install manhole pipes, connect the above pipes to the manhole pipes, pack mortar between the surroundings of the construction pipes and the manhole pipes, and water, earth and sand flow into it Take measures to stop the water. Then backfill and pull out the steel sheet pile. It is common to melt and remove the well water stopper.
[0005]
However, in the construction method, shaft excavation, steel sheet pile installation, tube propulsion from the shaft, manhole tube installation after the completion of propulsion, backfilling between manhole tube and steel sheet pile, steel sheet pile removal, etc. Have taken. In this construction method, in particular, a great amount of time is required for shaft excavation, backfilling, steel sheet pile removal, and the like, and there has been a strong demand for improvement in terms of reducing construction costs and shortening the construction period.
[0006]
For this reason, recently, concrete manhole pipes with holes for piping in advance have been laid down in advance according to the depth of excavation while digging in the longitudinal direction gradually, and laterally from the side wellhead of the laid manhole pipe. A method of propelling piping has been developed. In this construction method, a conventional wellhead water stop cannot be used, and it is necessary to newly develop a wellhead water stop that can be used for a manhole tube.
[0007]
For this reason, the present applicant has previously filed a patent application (Japanese Patent Laid-Open No. 8-158391) for a wellhead water stop that can be used for a manhole tube.
[0008]
In addition, a sunk manhole pipe is sunk by the sunk construction method shown in FIG. The construction method involves first excavating the ground shallowly and then sinking a concrete manhole tube 10 therefrom. Next, while excavating from the inside of the manhole tube 10, while gradually injecting the curing agent 9 for preventing soil collapse and the like around the manhole tube 10 to be set up, the manhole tube 10 is gradually removed by utilizing its own weight. Go down. Depending on the depth of the vertical shaft V to be formed, the manhole tubes 10 are stacked one after another, and the earth and sand inside the manhole tube 10 are submerged to a predetermined depth while being shoveled to form a desired shaft.
[0009]
Thereafter, from the side surface of the submerged manhole tube 10, the propulsion unit B and the piping c are propelled in two steps by the propulsion machine a using the wellhead 20 for penetrating piping construction provided in advance on this side surface. It is a construction method that carries out the construction work in one step.
[0010]
A wellhead 20 for penetrating piping is provided in advance on the side surface of the manhole pipe 10 used in the construction method, and a manhole pipe 10 is subsidized to form a vertical shaft as described above. A pipe is connected to the side of the manhole pipe 10 by propulsion while preventing the inflow of earth and sand, and the wellhead water stop A is buried as it is.
[0011]
As shown in FIGS. 7 (a) and 7 (b), the conventional wellhead water stopper A is inserted into the wellhead 20 of the manhole tube 10 and the sealing rubber plates 30a and 30b having a size for closing the entire wellhead are overlapped with each other. The lid 50 is sandwiched between the ring-shaped inner flange 40b and the outer flange 40a. Further, a lid 50 formed using a soft member such as polystyrene resin or wood is disposed on the outer surface of the seal rubber plate 30a, and the inner surface of the seal rubber plate 30b. A reinforcing plate 80 is arranged. Further, the lid 50 and the reinforcing plate 80 are integrally connected by a bolt B penetrating from the lid 50 to the reinforcing plate 80 at the position of the lateral portion of the outer flange 40a, and further, water is stopped at the outer end of the bolt B. A bolt 60 is attached to the outer periphery of the wellhead of the manhole tube 10 via a through hole 62 provided in the waterstop attachment member 60. It comes to be fixed with.
[0012]
The outer seal rubber plate 30a is provided with a small hole 31 for the propulsion destination conduit, and the peripheral edge of the small hole 31 is turned in a state where the propulsion destination conduit passes through the small hole 31, and the outer periphery of the front conduit is sealed. It comes to contact with keeping the sex. Further, the outer diameter of the outer seal rubber plate 30a is formed to be slightly larger than the inner diameter of the wellhead 20, and when installing the wellhead water stop A, the outer edge portion of the seal rubber plate 30a is the wellhead as shown in FIG. The seal of the wellhole 20 of the manhole is maintained by being in close contact with the inner wall 20a. Or mortar, packing, etc. are also used.
[0013]
Further, a hole 32 for propulsion piping is provided in the inner sealing rubber plate 30b, and the periphery of the hole 32 is turned in a state where the piping penetrates the hole 32 so as to come into contact with the outer periphery of the piping while maintaining sealing performance. Yes.
[0014]
Since the conventional wellhead water stop A is entirely disposed inside the wellhole 20 of the manhole tube 10, when the manhole tube 10 is laid down by a sinking method, friction with the surrounding ground can be reduced. The manhole tube 10 can be set without interfering with the apparatus for excavating the earth and sand.
[0015]
In addition, since the lid 50 is formed of a soft member that can be preceded by a propelling destination conduit and piping, the necessary holes can be formed by simply propelling the propelling destination conduit and piping from the inside of the manhole tube 10 when propelling the piping. The lid 50 can be opened.
[0016]
Further, since the reinforcing plate 80 is provided on the inner side surface of the wellhead water stop, it is pressed against the earth pressure that tries to push the lid 50 and the seal rubber plates 30a and 30b to the inside of the manhole tube. It is possible. Further, since the reinforcing plate 80 is fastened with nuts to the bolts B, the work can be performed with the reinforcing plate 80 removed during propulsion work. Although the conventional wellhead stop A has such advantages, it has the following problems.
[0017]
[Problems to be solved by the invention]
In the prior art, in the wellhead water stop provided on the manhole pipe set by the submergence method, a seal rubber plate formed so as to close the wellhead, ring-shaped inner flange and outer flange disposed on both sides thereof, and a lid Bolts that integrally connect the reinforcement plate and the reinforcing plate are arranged in the wellhead.For example, when propelling the pipe after propulsion of the propulsion destination pipe, the propulsion pipe is connected to the manhole pipe at the arrival side. When the core is misaligned in the state of reaching the wellhead water stop, the piping hits the bolt of the wellhead waterstop, and the connected state of the seal rubber plate, the flange, the lid, and the reinforcing plate is destroyed. For this reason, there is no member that closes the gap between the pipe and the wellhead in a state where the pipe reaches the wellhole of the manhole pipe on the propulsion reaching side, and there has been a problem that earth and sand or water flows into the manhole pipe.
[0018]
Therefore, the purpose of the present invention is to prevent the well water stop device from being damaged even if misalignment occurs at the arrival position of the pipe when propelling the pipe to the manhole pipe on the arrival side in the subsidence method. It is intended to ensure that piping work can be performed so that earth and sand and water do not flow into the manhole pipe when the pipe reaches the wellhead water stop of the manhole pipe on the arrival side.
[0019]
Another purpose is to provide a reversal prevention part in the inner flange so that the seal rubber plate, which is the seal member of the wellhead water stop, does not reverse, and to seal at the place where the propellant conduit or piping penetrates the seal rubber plate. Is to maintain good.
[0020]
[Means for Solving the Problems]
The wellhead water stop of the present invention is a waterstop that is attached to a through-hole construction wellhead formed on the side of the manhole pipe so as to propel the propulsion destination pipe and the propulsion pipe from the side of the manhole pipe that has been laid. A ring-shaped rigid inner flange that is attached to the outer surface of the peripheral edge of the wellhead, and is disposed on the outer surface of the inner flange, and has a curved surface corresponding to the outer peripheral curved surface of the manhole tube, and penetrates the wellhead A seal member that seals the propulsion destination conduit and the propulsion pipe; an outer flange that is disposed on an outer peripheral portion of the seal member and sandwiches the seal member between the inner flange; and the inner flange. A holding cylinder which is inserted into the wellhead and whose inner end is closed by a ceiling plate, and extends to the inside in the radial direction with respect to the inner diameter of the wellhole of the manhole pipe, And a rigid steel inversion preventing portion provided on said sealing member by said inversion preventing portion is characterized in that so as not inverted to the manhole pipe.
[0021]
In addition, the wellhead water stop of the present invention is provided with a radial slit in an inversion prevention portion formed to extend radially inward from the inner peripheral edge of the inner flange, and the propulsion pipe is misaligned to cause the inversion prevention portion. When hitting, the metal plate piece between the slits can be bent.
[0022]
Further, the seal member may be a seal rubber plate provided with a small hole for the propulsion destination conduit and a pipe penetrable portion for the propulsion pipe, and the seal member is arranged on the outside to provide a small hole for the propulsion destination conduit. The outer seal rubber plate and the inner seal rubber plate disposed on the inner side and provided with a pipe penetrable portion for propulsion piping may be used. You may make it comprise the pipe penetration possible part for propulsion piping so that a hole or a hole shape can be cut off. Pipe penetrations for propulsion piping are cut according to the pipe diameter, for example, a groove that matches the pipe diameter, a means that intermittently forms the groove, or a means that is formed in the slit of the perforation for cutting. What is necessary is just to form in a possible means. Furthermore, it may be formed in the hole from the beginning. The seal member is preferably a seal rubber plate, but other seal members may be formed using a material such as a synthetic resin other than rubber having appropriate elasticity and waterproofness.
[0023]
In the wellhead water stop of the present invention, the inner flange, the seal rubber plate, and the outer flange protrude from the outer periphery of the manhole in a state of being attached to the wellhole of the manhole, but the total protrusion thickness is not so large. For this reason, it is possible to set the manhole tube without causing friction with the surrounding ground as much as possible when setting the manhole tube, and without interfering with an apparatus for excavating the soil in the manhole tube.
[0024]
Further, since the seal member is sandwiched between the two ring-shaped flanges, the shape can be firmly maintained even when piping or the like is passed through the seal member during propulsion. When the sealing member is composed of a pair of sealing rubber plates, there is a small hole for the leading conduit at the time of propulsion work at the approximate center of the outer sealing rubber plate on the side close to the lid. By passing it through, the peripheral portion of the small hole of the seal rubber plate is slightly turned upside down, closely contacting the tube wall of the tip conduit, and the tip conduit can be passed through while preventing intrusion of earth and sand or water. The small holes in the outer seal rubber plate are open from the time when the manhole tube is laid down, but the inner end is provided with a holding cylinder whose inner end is closed by a ceiling plate. It does not flow into the pipe. In the construction method performed while pressurizing the curing agent around the manhole tube, the penetration of the curing agent can be prevented in the same manner as earth and sand.
[0025]
In addition, since a hole for piping is provided in a substantially central portion of the other inner seal rubber plate as a pipe penetrable portion, the peripheral portion of the hole is brought into close contact with the pipe wall of the pipe in the above manner, so that earth, sand, Pipes can be passed after propulsion of the leading conduit while preventing intrusion.
[0026]
On the other hand, when the sealing rubber plate is made of one sheet, the propulsion destination conduit can be passed through the small hole at the substantially center of the sealing rubber plate while preventing the intrusion of earth and sand or water as described above. Furthermore, since a pipe-penetrating portion such as a kerf is provided around the small hole so that a hole for the pipe can be formed, the earth and sand are not cut off from the kerf while passing through the propulsion destination conduit. On the other hand, when the pipe is passed, the hole for piping can be easily formed by cutting the groove.
[0027]
Furthermore, by providing a plurality of pipe-penetrable portions formed in means such as kerfs in a concentric manner with a small diameter as the center, it is possible to select a hole diameter that matches various pipe diameters.
[0028]
Since the holding cylinder is provided inside the inner flange of the wellhead water stop, when the water stop is attached to the wellhole of the manhole pipe, the holding cylinder of the water stop can be inserted and held in the wellhead. . Furthermore, since the inner end of the holding cylinder provided inside the sealing member is closed by a ceiling plate, earth and sand and water can enter the manhole tube from the small hole even if the sealing member has a small hole. There is no.
[0029]
Moreover, since the inner peripheral edge of the inner flange of the wellhead water stop is extended to the inside in the radial direction of the wellhole of the manhole and is formed in the inversion prevention portion, the seal member is attached with the waterstop attached to the wellhole of the manhole. Even when external pressure is applied, the inner peripheral part of the seal member is supported by the inversion prevention part, so that the seal member does not invert and is in contact with the outer periphery of the pipe that has been propelled. Intrusion can be prevented.
[0030]
Furthermore, since a radial slit is provided in the inversion prevention part provided in the inner flange, even if the propulsion pipe reaches the wellhead water stop of the reaching manhole, Even if the metal plate piece is bent and the pipe is pushed out of alignment, the water stop is not damaged. In addition, since the piping passes through the inner periphery of the holding cylinder of the water stop when the propulsion pipe reaches the well stop, the misalignment of the pipe is allowed in the range where the piping passes through the holding cylinder. .
[0031]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0032]
(Embodiment 1)
As described in the above-mentioned prior art, the wellhead water stop according to the present invention is a vertical shaft formed by laying concrete manhole pipes 10 downward one after another while excavating by the laying method shown in FIG. It is used when propelling a conduit or piping from the side wellhead 20 to the side wellhead of the shaft on the propulsion reaching side, and is attached to the wellhead so that water and earth and sand do not enter the shaft from the wellhead.
[0033]
The wellhead stop A of the present invention is attached in advance to the wellhead 20 for penetrating piping construction provided on the side surface of the manhole tube 10 used in the above method, and the manhole tube 10 is sunk in the above manner to form a vertical shaft, The pipe connection is made by propulsion work on the side surface of the manhole pipe 10 while preventing the inflow of earth and sand from the well opening 20, and the well stop water stop A is buried as it is.
[0034]
As shown in FIG. 1, the wellhead water stop A of the present embodiment is attached to the wellhead 20 for penetrating pipe construction on the side of the concrete manhole tube 10 used in the above-described construction method, and has two sealing members. A combined seal rubber plate is composed of an outer seal rubber plate 30a and an inner seal rubber plate 30b.
[0035]
The outer seal rubber plate 30a and the inner seal rubber plate 30b are formed to have a size that covers the entire surface of the wellhead 20 and the peripheral edge of the wellhead, and these peripheral portions are made of metal and are between the ring-shaped outer flange 40a and the inner flange 40b. It is sandwiched, and the shape of the seal rubber plate can be maintained even through the propulsion destination conduit or the like at the time of piping construction. Further, as shown in FIG. 3, the outer flange 40a and the inner flange 40b are formed so as to have curved surfaces along the outer peripheral surface of the cylindrical manhole tube 10, and the outer flange 40a and the inner flange 40b are sandwiched between the outer flange 40a and the inner flange 40b. The seal rubber plate 30 a and the inner seal rubber plate 30 b are also configured to have curved surfaces along the outer periphery of the manhole tube 10.
[0036]
The metal outer flange 40a and inner flange 40b and the metal holding cylinder 46 described later are coated with SDC coat / 402T JIS Class 1 black (tar epoxy resin paint, Dainippon Paint Co., Ltd.) to prevent rust. is doing.
[0037]
In order to position the outer seal rubber plate 30a and the inner seal rubber plate 30b at the outer flange 40a and the inner flange 40b so as to be positioned and fixed, the diameter of the outer surface of the inner flange 40b is as shown in FIG. Screw pins 41 are attached to the upper two places by spot welding. The outer seal rubber plate 30a and the inner seal rubber plate 30b are also provided with pin holes at positions corresponding to the screw pins 41, and the pin holes of the inner seal rubber plate 30b and the outer seal rubber plate 30a are respectively passed through the screw pins 41 so that both the seal rubber plates 30a. , 30b. The outer flange 40a is also provided with a pin hole at a position corresponding to the screw pin 41. The pin hole of the outer flange 40a is passed through the screw pin 41 and overlaid on the outer seal rubber plate 30a. By screwing, the inner seal rubber plate 30b and the outer seal rubber plate 30b are sandwiched between the outer flange 40a and the inner flange 40b.
[0038]
Since the screw pin 41 is spot welding as described above, there are few welded portions and no protruding portion is generated by welding. Therefore, the seal rubber is passed through the respective pin holes of the outer seal rubber plate 30a and the inner seal rubber plate 30b. When the plates are overlapped and the outer flange 40a is further overlapped and fixed with a nut, no error occurs in the thickness dimension.
[0039]
Further, a through hole 25 is provided so as to penetrate from the outer flange 40a to the inner flange 40b in a state where a seal rubber plate is sandwiched between the two outer flanges 40a and the inner flange 40b. And when fixing the well stop water stop A provided with the sealing rubber plates 30a and 30b sandwiched between the flanges 40a and 40b and the holding cylinder 46 to be described later on the periphery of the well opening 20 of the manhole pipe 10, the holding cylinder 46 Is inserted into the wellhead 20 and temporarily fixed, a hole is drilled from the through hole 25 to the outer periphery of the manhole tube 10, and the anchor 26 is driven into the hole with a hammer to fix the anchor 26 to the manhole tube 10. It is also possible to fix with bolts instead of anchors.
[0040]
By fixing in this way, the wellhead water stop A can be attached to the outer peripheral surface of the manhole tube 10 without a gap. In the present embodiment, mortar or the like is not applied to the corner portion of the overlapping portion between the wellhead water stop A and the wellhead 20 of the manhole pipe 10, but mortar may be applied to make the sealing property more reliable. . Further, a sealing property is improved by interposing a sponge between the inner flange 40b of the wellhead water stop A and the outer peripheral surface of the manhole tube 10.
[0041]
In addition, by attaching the wellhead water stop A to the wellhead 20, the inner flange 40b and the outside, the inner seal rubber plates 30a and 30b, and the outer flange 40a as a whole protrude from the outer peripheral surface of the manhole tube 10, for example, by about 29.5 mm. The overcut of the lowermost blade edge used when the manhole tube 10 is set is, for example, 50 mm (diameter: 100 mm), so that no great friction is generated during setting.
[0042]
The outer seal rubber plate 30a is formed in a thin circular shape, the inner seal rubber plate 30b is formed in a thick circular shape, the two are aligned with each other, and the peripheral portions thereof are formed by the outer flange 40a and the inner flange 40b as described above. It is tightly clamped from both sides. In addition, the thickness of both the sealing rubber plates 40a and 40b can be selected as appropriate.
[0043]
Further, a small hole 31 having a diameter slightly smaller than the diameter of the propellant conduit is provided in the approximate center of the outer seal rubber plate 30a. When the propulsion destination conduit is passed through the small hole 31 that is open, the rubber at the peripheral portion of the small hole 31 is turned up and closely adheres to the periphery of the tube wall of the propulsion destination conduit, and earth, sand, water, and the like enter the manhole pipe 10. Can be prevented. A small hole 32 is formed in the inner seal rubber plate 30b as a pipe penetrable portion, but a holding cylinder 46 described later is provided on the inner side and the inner peripheral opening is closed by a ceiling plate 47. Even if the manhole pipe 10 attached with the water device A is sunk, earth and sand and water will not enter the manhole pipe from the small hole 31.
[0044]
A circular hole 32 that is slightly smaller in diameter than the small hole 31 and concentric with the small hole 31 and larger than the small hole 31 is opened as a pipe-penetrating portion at the approximate center of the inner seal rubber plate 30b formed on the other wall thickness. It has been. Then, after passing through the propulsion destination conduit, the pipe is propelled through the hole 32 of the inner seal rubber plate 30b while preventing the intrusion of earth and sand into the manhole tube 10 in the same manner as when passing through the propulsion destination conduit. It is supposed to let you. Instead of the hole 32, a hole groove having the same radius may be provided in the inner seal rubber plate 30b, and the inside thereof may be cut to form the hole.
[0045]
In this embodiment, SBR (styrene-butadiene rubber) is used for the outer seal rubber plate 30a and the inner seal rubber plate 30b. In addition to SBR, NR (natural rubber), CR (chloroprene rubber), NBR (nitrile butadiene rubber), IIR (butyl rubber), EPDM (ethylene / propylene rubber), and the like can also be used.
[0046]
The inner peripheral edge of the inner flange 40b extends slightly inward in the radial direction from the inner diameter of the wellhead 20, and is formed in the inversion preventing portion 45. In the inversion preventing portion 45, as shown in FIGS. 48 is provided. In the present embodiment, the number of the slits 48 is 16, and the metal plate pieces 48a between the slits 48 are for dealing with the case where the pipe passing through the leading conduit is misaligned, and the propulsion reaches When the propulsion piping reaches the well stop water stop A attached to the manhole pipe 10 on the side, the metal plate piece 48a between some slits 48 where the piping hits the inversion preventing portion 45 only bends. The water stop A is not damaged.
[0047]
Further, since the inversion preventing portion 45 is extended inward in the radial direction of the wellhead and is in contact with the surface of the seal rubber plate 30b, as described above, the outer seal rubber having a curved surface in a state sandwiched between the outer and inner flanges 40a and 40b. The plate 30a and the inner seal rubber plate 30b are not reversed inward due to earth pressure. And by this reversal prevention, the outer seal rubber plate 30a and the inner seal rubber plate 30b are wound around and contacted with the outer periphery of the propulsion destination conduit and the pipe passing therethrough, and the sealing performance is maintained.
[0048]
In addition, a metal holding cylinder 46 is attached to the inner peripheral surface of the inner flange 40b with good water-stopping by welding so that the axis thereof is vertical, and the holding cylinder 46 is inserted into the wellhead, thereby The vessel A is held at the wellhead 20, can be easily temporarily fixed at a predetermined position, and workability can be improved. Note that the inner end of the holding cylinder 46 in the axial direction is closed by a metal ceiling plate 47, and the ceiling plate 47 is also attached to the cylinder portion of the holding cylinder 46 with good water-stopping properties by welding.
[0049]
The ceiling plate 47 of the holding cylinder is formed by burning holes of a corresponding size separately with a gas burner so as to pass the propelling destination conduit and the piping, and let each pipe pass. The length of the holding cylinder 46 in the axial direction is set such that the outer seal rubber plate 30a and the inner seal rubber plate 30b disposed on the back surface of the ceiling plate 47 are not burned by heat in the burn-out operation by the gas burner. ing.
[0050]
Further, since the propulsion pipe passes through the cylindrical portion of the holding cylinder 46, the pipe misalignment can be allowed as long as the pipe does not damage the cylindrical portion.
[0051]
(Embodiment 2)
In the above-described embodiment, two seal rubber plates are provided as seal members in the wellhead water stop A. However, the seal member may be formed by only one seal rubber plate 30 as shown in FIG. In that case, the configuration other than the seal rubber plate 30 is the same as that of the above embodiment.
[0052]
In this case, the seal rubber plate 30 is formed thinly from the outer periphery toward the inner periphery, and the outer peripheral portion 40a and the inner flange are formed so that the peripheral portion has a curved surface along the outer peripheral surface of the manhole tube as in the above embodiment. By being sandwiched between the flanges 40b, the seal rubber plate 30 is formed to have a curved surface along the outer periphery of the manhole tube 10. Further, the seal rubber plate 30 is sized to cover the entire surface of the wellhead and the peripheral portion thereof, and a small hole 31 for passing the propulsion destination conduit is provided at the center, and the leading conduit can be passed through the small hole 31 opened. it can. Further, the one seal rubber plate 30 is provided with a ring-shaped groove 33 that is concentric with the small hole 31 and slightly smaller in diameter than the pipe as a portion that can penetrate the pipe. The pipe to be propelled is passed after the propelling pipe.
[0053]
Further, the single seal rubber plate formed with one piece has a cut groove 33 having a diameter slightly smaller than the outer diameter of the propulsion pipe as a pipe penetrable portion. It is also possible to provide constricted concentric holes so that holes can be formed by cutting with a kerf or constriction of a corresponding size even when the diameter of the propulsion pipe is different.
[0054]
The pipe penetrable portion may be formed in the continuous kerf 33 as described above, but the kerf 33 may be formed intermittently. Alternatively, as shown in FIG. 5B, it may be formed by a perforated slit 31a that can be cut off.
[0055]
Thus, the provision of the plurality of kerfs 33 and the plurality of ring-shaped constrictions is not limited to the one composed of one seal rubber plate 30, and also in the case of the two seal rubber plates 30 a and 30 b described above. Applicable.
[0056]
In the above embodiment, the shape of the wellhead water stop A is formed in a circular shape that matches the round tube that is normally used, but if necessary, the shape is adapted to the other pipe shape such as a square tube. It doesn't matter.
[0057]
In the present invention, a small hole for the propulsion destination conduit is formed in advance in the seal rubber plate, but it is also possible to have a structure in which a cut groove that can be cut off at any time is provided without opening the small hole from the beginning. .
[0058]
As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments of the invention. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, there is.
[0059]
【The invention's effect】
Of the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.
[0060]
(1). In the wellhead water stop of the present invention, the outer and inner flanges and the seal rubber plate protrude from the outer periphery of the manhole tube, but the protruding thickness is small, so there is no friction with the surrounding ground. Manhole pipes can be laid without interfering with the device for excavating earth and sand, and piping can be laid from the side of the set manhole pipe by propulsion while preventing inflow of earth and sand into the manhole pipe .
[0061]
(2). In the present invention, since the wellhead water stop can be buried as it is, it is possible to reduce the man-hours associated with the removal of the conventional wellhead water stop and to ensure the inflow of earth and sand into the shaft. Can be prevented.
[0062]
(3) Since the holding cylinder is provided on the inner side of the inner flange, the water stopper can be easily temporarily fixed at the wellhole of the manhole pipe. In addition, since the inner end of the holding cylinder is closed with a ceiling plate, even if the seal rubber plate is initially perforated, the ceiling plate of the holding cylinder is closed on the inside, so earth and sand and water can enter the manhole pipe. Never enter.
[0063]
(4). Since the inversion prevention part is provided on the inner flange of the waterstopper, it is possible to prevent the sealing rubber plate configured to have a curved surface along the outer peripheral surface of the manhole tube from being inverted inward by external pressure, The seal rubber plate can be brought into contact with the outer periphery of the propulsion destination conduit or the propulsion pipe with a good sealing property.
[0064]
(5) The inversion prevention part is extended radially inward of the inner flange, but since the inversion prevention part is provided with a slit, the propulsion pipe is propelled and the water stop of the arrival side manhole pipe Even when the center of the anti-reversal part is reached, the metal plate piece between the slits of the inversion preventing part is bent and passes through the pipe, so that the wellhead water stop is not damaged.
[Brief description of the drawings]
FIG. 1 is a perspective view of a wellhead water stop according to the present invention separated from a manhole tube.
FIG. 2 is a perspective view of the wellhead water stop as seen from the back.
FIG. 3 is a cross-sectional view of a state in which a wellhead water stop is attached to a wellhole of a manhole pipe.
FIG. 4 is a rear view (a) of the wellhead water stop and a cross-sectional view taken along the line AA of FIG.
FIG. 5 is a perspective view (a) showing a wellhead water stop according to another embodiment of the present invention, and a configuration of a pipe penetrable portion provided on a seal rubber plate in the water stop according to still another embodiment. It is a front view (b).
FIG. 6 is an explanatory diagram of a sinking method to which a wellhead water stop is applied.
FIG. 7 is a front view (a) and a cross-sectional view (b) showing a conventional wellhead water stop.
[Explanation of symbols]
10 Manhole tube
20 wellhead
30a Outer seal rubber plate
30b inner seal rubber plate
31 small hole
32 holes
40a Outer flange
40b Inner flange
45 Inversion prevention part

Claims (5)

A water stop that is attached to a through-hole construction borehole formed on the side of the manhole pipe in order to propel and construct the propulsion destination conduit and the propulsion pipe from the side of the manhole pipe that has been set up,
A ring-shaped rigid inner flange that has a curved surface corresponding to the outer circumferential curved surface of the manhole tube and is attached to the outer surface of the peripheral edge of the wellhead;
A seal member disposed on an outer surface of the inner flange and sealing the propulsion destination conduit penetrating the wellhead and the propulsion pipe;
An outer flange disposed on the outer periphery of the seal member, and sandwiching the seal member with the inner flange;
A holding cylinder provided on the inner flange, inserted into the wellhead and whose inner end is closed by a ceiling plate;
A rigid anti-inversion portion provided on the inner flange extending radially inward from the inner diameter of the wellhole of the manhole tube,
A wellhead water stop for a manhole pipe side wellhead, wherein the reversal prevention portion prevents the seal member from reversing into the manhole pipe. A radial slit is provided in the inversion prevention part formed to extend radially inward from the inner peripheral edge of the inner flange, and when the propulsion pipe is misaligned and hits the inversion prevention part, the metal plate piece between the slits The wellhead water stop for a manhole pipe side wellhead according to claim 1, which is bent. 3. The wellhead for a manhole pipe side wellhead according to claim 1 or 2, wherein the seal member is a seal rubber plate provided with a small hole for a propulsion destination conduit and a pipe penetrable portion for the propulsion pipe. Water container. The seal member is composed of an outer seal rubber plate disposed on the outer side and provided with a small hole for the propulsion destination conduit, and an inner seal rubber plate disposed on the inner side and provided with a pipe penetrable portion for the propulsion pipe. The wellhead water stop for a manhole pipe side wellhead according to claim 1 or 2, characterized by the above-mentioned. 5. The wellhead water stop for a manhole pipe side wellhead according to claim 3 or 4, wherein the pipe penetrable portion for the propulsion pipe is configured to be cut into a hole or a hole shape.

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