JP3599394B2 - Well stop device for side hole of manhole pipe - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a water stop device for preventing intrusion of earth and sand, water, and the like provided at a wellhead on a side of a manhole pipe when a pipe such as a drain pipe is propelled and constructed from a side face of a buried manhole pipe.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, drainage pipes and the like are propelled and excavated from inside a manhole toward a buried pipe to connect the pipes. In this construction, a steel sheet pile driven into the side of the shaft is opened by a burner from inside the basement to open a pit for pipe construction, and a pit stop shown in FIG. 8 is attached to the opening of the pit.
In the wellhead stop, a circular rubber plate is placed on one side of the annular flange to prevent the inflow of earth and sand during piping work, and the flange is welded to the hole in the steel sheet pile that was opened by cutting with a burner. The rubber plate is sandwiched and bolted to the annular flange. After that, the pipe is propelled by the propulsion device and the pipe is laid.
After laying the pipes, placing concrete or installing manhole pipes, connecting the above pipes to the manhole pipes, filling the mortar between the surroundings of the construction pipes and the manhole pipe well, and inflow of water, earth and sand, etc. Take a water stoppage measure so that it does not. Then backfill and pull out the sheet pile. It is common to blow off and remove wellhead waterstops.
[0003]
[Problems to be solved by the invention]
However, in the conventional construction method, excavation of a shaft, installation of a steel sheet pile, pipe propulsion from the inside of the shaft, installation of a manhole pipe after completion of the propulsion, backfilling between the manhole pipe and the steel sheet pile, removal of the steel sheet pile, etc. Has taken. In such a construction method, digging, backfilling, and removal of steel sheet piles require a great deal of time, and there has been a strong demand for improvement in terms of reducing construction costs and shortening the construction period.
For this reason, recently, concrete manhole pipes with holes for piping provided in advance in the vertical direction have been sunk while being added in accordance with the excavation depth while gradually excavating in the vertical direction. A method of drilling pipes has been developed. In such a construction method, a conventional well stop was not able to be used, and it was necessary to develop a well stop newly usable for a submerged manhole pipe.
[0004]
In addition, the wellhead stop can be set within the manhole pipe wall thickness so that it does not friction with the surrounding ground when the manhole pipe is laid, and does not get caught on buckets such as clamshells that excavate soil inside the manhole pipe. Must.
In addition, after the pipe is propelled, the structure must be able to be buried and killed without removing the water stop unlike the conventional method.
Furthermore, since a hardening agent for earth and sand is injected into the outer peripheral portion of the manhole pipe that has been previously set, it is necessary to effectively prevent the hardening agent from flowing into the manhole pipe.
Therefore, the present invention is proposed in view of the above problems and necessity, and in the case where a drainage pipe or the like is propelled from the side of a sunk manhole pipe, a wellhead used for a wellhead provided on the side of the manhole pipe. Provide a water bowl.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention Sunk underground by construction method Manhole tube Formed into For penetration pipe construction to construct propulsion leading pipes and pipes of At the wellhead Be A water stop device which is installed in the well hole Be A flange is provided with a hole through which a pipe propelled after propulsion of the propulsion preceding pipe passes, and a seal rubber plate held by the flange, and a soft member arranged on the outer surface side of the wellhead and fixed to the flange. Cover the wellhead without protruding from the outer surface of the manhole pipe A lid and a detachably attached to the flange from the inside , Supporting the lid and the sealing rubber plate against earth pressure And a reinforcing plate. Further, the well stop device for a side hole of a manhole pipe according to the present invention is arranged within the wall thickness of the manhole pipe without protruding from the inner surface and the outer surface of the manhole pipe.
[0006]
In the mouth stop device for a side hole of a manhole pipe according to the present invention, the seal rubber plate passes through the first seal rubber plate through which the propulsion preceding pipe at the time of piping is penetrated, and the pipe propelled after the propulsion preceding pipe is propelled. The second seal rubber plate provided with a hole is characterized by comprising two sheets. Further, the seal rubber plate is provided with a small hole for a propulsion leading pipe at the time of pipe construction, and a cut groove is formed outside the small hole to form a hole for a pipe through which a pipe propelled after propulsion of the propulsion leading pipe penetrates. It is characterized by having. Further, an outer diameter of the seal rubber plate is formed to be larger than an inner diameter of the wellhead, and an outer edge portion of the seal rubber plate comes into close contact with the well when the well stop is attached to the well.
[0007]
A well stop device for a manhole tube side wellhead according to the present invention includes a bolt that penetrates the flange, the seal rubber plate, the reinforcing plate, and the lid from outside the manhole tube, and a nut that is screwed to the bolt. It is characterized by being tightened together. A substantially annular packing closely attached to the inner peripheral surface of the wellhead is attached to the flange. Further, the lid is made of foamed styrene resin or wood.
[0008]
[Action]
In the wellhead water stop according to the present invention, a seal rubber plate is attached to an annular flange fitted to the wellhead, and the waterstop main body does not protrude from the inner surface and the outer surface of the manhole tube, and the wall of the manhole tube does not protrude. Since the manhole pipe can be set within the thickness, the manhole pipe can be sunk without causing friction with the surrounding ground as much as possible when the manhole pipe is sunk, and without obstructing a device for excavating the earth and sand in the manhole pipe. In addition, since the flange is covered with a lid, this lid side is turned to the outside of the manhole, if a wellhead water stop is attached and sunk, the intrusion of sediment and hardener etc. into the manhole pipe is prevented. be able to.
[0009]
Furthermore, since the hardener is prevented from entering by the lid, the hardener does not harden immediately after the seal rubber plate, and does not arrive, and when the propulsion tube is propelled, the seal rubber plate is cut by the blade at the head of the tube. There is no fear.
In addition, since the lid is formed of a soft member that can be pierced with the propulsion pipe and the pipe, only the propulsion pipe or pipe is propelled from the inside of the manhole pipe at the time of propulsion construction of the pipe, and the necessary holes are covered. Can be opened. In particular, if the lid is made of styrofoam resin or wood, perforation becomes easier.
Further, since the lid member adjacent to the seal rubber plate is formed of a soft member, the seal rubber plate can be effectively prevented from being cut by the blade at the head of the tube when the propulsion tube is propelled.
[0010]
Since a reinforcing plate is provided on the other flange surface, it is possible to prevent the lid or the seal rubber plate from pressing against the inside of the manhole tube against the earth pressure. Furthermore, since this reinforcing plate can be removed, the work can be performed by removing the reinforcing plate during propulsion construction.
When two sealing rubber plates are combined, a small hole for the leading pipe at the time of propulsion construction is provided at approximately the center of the sealing rubber plate near the lid, so the leading pipe is passed through the small hole at the time of propulsion construction Thus, the peripheral portion of the small hole of the seal rubber plate is slightly turned up and closely adheres to the pipe wall of the preceding pipe, so that the preceding pipe can be passed while preventing intrusion of earth and sand, water, and the like. In the construction method in which the hardener is pressed into the periphery of the manhole tube, the hardener can be prevented from entering.
In addition, since a hole for piping is provided substantially at the center of the other seal rubber plate, the peripheral portion of the hole is closely attached to the pipe wall of the pipe in the above-described manner to prevent intrusion of soil, water, etc. After the propulsion of the preceding pipe.
[0011]
On the other hand, when a single sealing rubber plate is formed, the propulsion leading pipe can be passed through the small hole substantially at the center of the sealing rubber plate while preventing intrusion of soil, water, and the like in the above-described manner. Furthermore, since a cut groove is provided around the small hole so that a hole for piping can be formed, while passing through the propulsion leading pipe, it is not cut off from the cut groove to prevent intrusion of soil and the like as it is. When the pipe is passed, the hole for the pipe can be easily formed by cutting from the above-mentioned kerf.
Further, by providing a plurality of cut grooves concentrically around the small hole, the hole diameter can be selected according to various pipe diameters.
Regarding the seal rubber plate, regardless of the configuration of two or one, the outer edge portion of the seal rubber plate is placed along the inner wall of the well when the well stop is attached to the well for penetrating piping on the side of the manhole pipe. The outer diameter is formed larger than the inner diameter of the wellbore so that it can be tightly closed so that water can be stopped.If the waterstop is installed inside the pit from the outside of the manhole pipe, the outer edge of the seal rubber plate is rolled up. Thus, it is possible to more effectively prevent the hardening agent or the like from intruding when the manhole pipe is laid down.
[0012]
Further, the reinforcing plate, between the flange, a bolt inserted from the lid side, a lid, a water stop device mounting member, a nut for fixing together with the flange and the seal rubber plate is interposed, and the nut is further tightened with the nut. Since it is attached, the reinforcement plate can be easily removed without loosening other parts. Except for the reinforcing plate, it is attached to the manhole pipe without loosening, so after propulsion construction, the wellhead stop can be buried and killed. Furthermore, if the propulsion direction or the sunk position is greatly displaced, the flange, the seal rubber plate and the like can be removed by removing the nut. That is, the effective inner diameter of the wellhead can be increased by the amount of the flange.
Furthermore, in such a configuration, since a rib is interposed between the reinforcing plate and the flange, even if a gap is formed between the reinforcing plate and the flange due to the interposition of the nut, the gap is filled with the rib to seal the rubber seal plate. It is supported from behind so that it can withstand the earth pressure.
In addition, on the outer peripheral edge portion between the reinforcing plate and the flange with the rib interposed, a substantially annular packing that is in close contact with the inner wall of the well for through pipe construction on the side of the manhole pipe so as to be able to stop water, the reinforcing plate and the flange. Since the water stop device and the inner wall of the pit are in contact with each other with no space therebetween by interposing the packing, the intrusion of the curing agent or the like when the manhole pipe is laid can be more reliably prevented.
[0013]
【Example】
An embodiment of the present invention will be described with reference to the drawings.
The wellhead stopper of the present invention is a steel sheet pile previously driven into the side of the shaft, opening a wellhead for through pipe construction from the inside of the underground shaft, attaching a wellhead stopper to this, and piping from this wellhead. It is not used for the conventional construction method of propelling construction, etc., but for the submersion construction method of propelling and constructing pipes etc. from the side entrance of the vertical shaft formed by directly laying concrete manhole pipes temporarily while excavating . Therefore, an outline of a submersion method, which is a prerequisite for using the wellhead stoppage device of the present invention, will be described.
[0014]
In the submersion method, as shown in FIG. 7, the ground is first dug shallowly, and a manhole pipe 10 made of concrete is submerged there. Next, while excavating from the inside of the manhole pipe 10, the manhole pipe 10 is gradually sunk using the own weight of the manhole pipe 10 while a hardening agent for preventing soil collapse or the like is injected around the submerged manhole pipe 10. go. Depending on the depth of the shaft to be formed, the manhole pipes are temporarily stacked, and the earth and sand inside the manhole pipe 10 is sunk with a shovel and sunk to a predetermined depth to form a desired shaft.
Then, from the side of the manhole pipe 10 that has been sunk, a construction method in which the propulsion leading pipe B and the pipe C are propelled and constructed in two steps by a propulsion device using a wellhead 20 for through pipe construction previously provided on this side, or This is a construction method in which plumbing is promoted in one process.
The wellhead stop A of the present invention is attached in advance to a wellhead 20 for penetrating piping provided on the side of the manhole pipe 10 used in the above-mentioned construction method, sinks the manhole pipe 10 in the above-described manner to form a shaft, The piping is connected to the side surface of the manhole pipe 10 by propulsion construction while preventing the inflow of earth and sand from the wellhead 20, and the wellhead stop A is directly buried and used.
[0015]
(Example 1)
As shown in FIG. 1, a wellhead stop A of the first embodiment is attached to a wellhead 20 for penetrating piping on the side of a concrete manhole pipe 10 used for the above-mentioned submerging method, and is a two-piece joint. This is a configuration having seal rubber plates 30a and 30b.
The two sealing rubber plates 30a, 30b are sandwiched between the two annular metal flanges 40a, 40b from both sides, so that the shape can be maintained even when a propulsion leading pipe or the like is passed during piping. The flanges 40a and 40b are formed in an annular shape having an outer shape that can be fitted exactly inside the opening of the wellhead 20. The circular openings at the center of the flanges 40a and 40b are set to a size that does not interfere with the construction of the through pipe, and four holes 40c for fixing bolts B to be described later are provided at equal intervals in the peripheral portion. Has been.
[0016]
The seal rubber plate 30a is formed in a thin circular shape, and the seal rubber plate 30b is formed in a thick circular shape. The two are face-to-face with each other, and the peripheral portions thereof are formed on both sides by the two annular flanges 40a and 40b as described above. It is formed so as to be strongly sandwiched in a pressure-bonded state.
The thin seal rubber plate 30a is formed to have a diameter slightly larger than the diameter of the flange 40a, so that when the wellhead stop A is fitted and installed inside the opening of the wellhead 20, it can be closely attached to the inner wall 20a without any gap. It has become. Further, a small hole 31 having a diameter slightly smaller than the diameter of the propulsion leading pipe is formed substantially at the center of the seal rubber plate 30a. When the propulsion precedence pipe is passed through the small hole 31, the rubber at the peripheral portion of the small hole 31 is turned up and adheres to the periphery of the pipe wall of the propulsion precedence pipe, so that earth and sand, water and the like cannot enter the manhole pipe 10. I have.
[0017]
At the approximate center of the other thick seal rubber plate 30b, a circular hole 32 having a diameter slightly smaller than the diameter of the pipe concentric with the small hole 31 and larger than the small hole 31 is formed. In this way, after passing through the propulsion preceding pipe, the pipe can be passed while preventing intrusion of earth, sand, water, etc. into the inside of the manhole pipe 10 in the same manner as when passing the propulsion preceding pipe.
In this embodiment, SBR (styrene-butadiene rubber) is used for the seal rubber plates 30a and 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.
A bolt insertion hole 30c is provided in a peripheral portion of each of the seal rubber plates 30a, 30b at a position that can be referred to as a bolt insertion hole 40c provided in the flange portions 40a, 40b.
[0018]
On the other hand, on the outer surface side of the flange 40a in contact with the thin seal rubber plate 30a, the lid 50 covers the entire circular surface including the annular surface of the flange 40a and the thin seal rubber plate 30a. The lid 50 is formed using a soft member such as styrene foam resin or wood. By providing the lid 50 in this manner, the hardener is prevented from entering the inside of the manhole tube 10 and serves as a margin for deformation of the rubber plate. It is possible to prevent the seal rubber plate 30a from being cut off by being sandwiched between the hardening agent.
Further, as shown in FIGS. 1 (a) and 1 (b), the shape of the lid 50 is tapered so that the outer portion is adapted to the outer peripheral curvature of the side surface of the manhole tube 10 from the YY line toward the peripheral portion. Moreover, the whole is formed in a substantially trapezoidal shape, and when the wellhead stop A is attached to the wellhead 20 of the manhole pipe 10, the front of the wellhead 20 can be closed with the lid 50. In the case where wood is used for the lid 50, it is easier to pierce by providing a cutting blade at the end of the propulsion-side pipe such as the propulsion pipe or pipe.
[0019]
Further, four holes 50c for bolt insertion are also provided on the periphery of the lid 50 at positions that can match the positions of the holes 40c, 30c for bolt insertion of the flanges 40a, 40b and the seal rubber plates 30a, 30b. A metal sleeve 51 through which the screw portion of the bolt B is inserted is inserted into the hole 50c.
The four holes 50c are provided with a water stop device mounting member 60 for providing the water stop A in the well 20 for penetrating piping. The water stop device mounting member 60 is formed in a shape in which a rectangular metal plate is bent in the longitudinal direction according to the curvature of the outer periphery of the manhole tube 10, and a bent portion 61 is formed from a bolt insertion hole 50 c portion of the lid 50. The bolt B is attached together with the other parts by joint tightening so as to project in four directions.
When the well stop A is mounted on the side of the manhole pipe 10, as shown in FIG. 6, the water stop mounting member 60 just crosses over the side of the manhole so as to cross the bent portion 61 into the manhole pipe. It is only necessary that the bolt 10 is bolted from the bolt hole 62 while being in close contact with the outer peripheral surface.
[0020]
The lid 50, the water stop device mounting member 60, the flanges 40a and 40b, and the sealing rubber plates 30a and 30b configured as described above are inserted through the screw portion of the bolt B from the lid 50 side, and the nut 70a is connected to the flange 40b side. They are fixed together.
Further, a reinforcing plate 80 made of a circular iron plate having a diameter substantially equal to the diameter of the flange 40b facing the flange 40b side is provided with the bolt B at a position of a bolt insertion hole 80c provided in a peripheral portion of the reinforcing plate 80. It is inserted and attached by a nut 70b. Between the reinforcing plate 80 and the surface of the flange 40b, there is provided a cross-shaped rib 90 having substantially the same thickness as the nut 70a sandwiched between the surface of the flange 40b and the reinforcing plate 80. , The flanges 40a, 40b and the seal rubber plates 30a, 30b can be supported by the reinforcing plate 80 so as not to be pushed into the inside of the manhole tube 10 by earth pressure.
[0021]
Since the reinforcing plate 80 is configured as described above, the rib 90 and the reinforcing plate 80 can be easily removed without loosening the nut 70a only by removing the nut 70b at the time of propulsion construction.
After the completion of the piping work, mortar is filled in the gap around the manhole pipe and the installed pipe with the reinforcing plate removed, and the wellhead stop is buried.
A substantially rectangular window 80a is opened on both sides of the center of the circular reinforcing plate 80 so that the situation on the sealing rubber plate 30b side from the reinforcing plate 80 can be checked. If the user touches the window 80a, the wellhead stop A is convenient to carry.
When attaching the wellhead stop A to the manhole pipe 10, as shown in FIG. 2, mortar is packed around the gap between the lid 50 of the wellhead stopper A and the inner wall 20a, and the manhole pipe The penetration of a hardening agent, water, and the like used during the precipitation is prevented.
[0022]
(Example 2)
The wellhead stop A used in the second embodiment has the same basic configuration as that of the first embodiment, but as shown in FIGS. 3A and 3B, the inner wall 20a of the wellhead A and the wellhead A The structure further enhances the function of preventing the intrusion of a hardener, water, or the like from a gap portion between them.
In the wellhead stop A shown in FIG. 3A, the outer diameter of the thinner sealing rubber plate 30 a of the wellhead stopper A shown in the first embodiment is formed larger than the inner diameter of the wellhead 20. The outer diameter of the seal rubber plate 30a is set such that the outer peripheral edge portion of the seal rubber plate 30a is located outside the manhole tube 10 at the wellhead 20 as shown in FIG. The outer peripheral edge portion is turned so as to be able to come into close contact with the wellhead inner wall 20a. In this manner, even if a hardening agent, water, or the like intrudes into the pit from the wellhead 20, it can be effectively prevented by the outer peripheral edge portion of the seal rubber plate 30 a whose entire circumference is in close contact with the wellhead inner wall 20 a. ing.
In this embodiment, the outer diameter of the seal rubber plate 30a is increased. For example, a thin rubber ring is integrally formed on the outer peripheral portion of the thick seal rubber plate 30b so as to be able to be in close contact with the inner wall 20a as described above. It may be formed.
[0023]
In the wellhead stop A shown in FIG. 3B, an annular packing 81 is provided on the outer peripheral edge of the reinforcing plate 80 and the flange 40 b of the wellhead stop A of the first embodiment. The packing 81 is formed of a material such as rubber sponge, and is formed in an annular shape slightly larger than the inner diameter of the wellhead 20. Therefore, when the wellhead stop A is set in the pit, the packing 81 of the wellhead A is in close contact with the inner wall 20a as shown in FIG. 3B. Therefore, even if a hardening agent, water, or the like intrudes into the pit from the wellhead 20, it can be effectively prevented by the packing 81 whose entire circumference is in close contact with the wellhead inner wall 20 a.
Further, the packing 81 is used in combination with the configuration in which the outer diameter of the sealing rubber plate 30a is increased as described above, or when the wellhead stop A is set as shown in FIG. By filling the space between the outer periphery of the pit 50 and the pit wall 20a with mortar, the function of preventing the hardener or the like from entering the pit can be further enhanced.
[0024]
(Example 3)
As shown in FIG. 4, a wellhead stop A used in the third embodiment is used for a circular wellhead 20 for penetrating piping provided on the side of a concrete manhole pipe 10, and one seal rubber is used. This is a configuration having a plate 100.
The third embodiment is similar to the first embodiment except for the configuration of the seal rubber plate 100. The seal rubber plate 100 is formed in a disk shape slightly larger than the diameter of the same annular flanges 40a and 40b as in the first embodiment, and when fitted and mounted inside the opening of the wellhead 20, there is no gap on the inner wall of the well. It can be closely attached.
Further, the disk-shaped seal rubber plate 100 is formed so that the thickness gradually becomes thinner toward the center portion and becomes gradually higher than the periphery, and the protruding end portion 100a is formed flat. A small hole 31 having a diameter slightly smaller than the diameter of the propulsion leading pipe is opened in the flat protruding end portion 100a at the center of the sealing rubber plate 100, and as described in the first embodiment, while preventing intrusion of earth and sand, water, etc. Can be passed through.
[0025]
In addition, the incision 110 which partitions the flat protruding end portion 100a provided with the small hole 31 into a circle is formed in a groove shape having a slightly thinner rubber thickness only in that portion, and can be cut out from the incision groove 110 in a circular shape. It has become. The size of the protruding end portion 100a that can be circularly cut by the cut groove 110 is set according to the pipe diameter. The peripheral portion of the sealing rubber plate 100 is sandwiched between the two annular flanges 40a and 40b from both sides.
In addition, a lid 50 having the same configuration as that of the first embodiment is provided in contact with the cut-out protruding end portion 100 a whose bottom portion is higher in the center of the seal rubber plate 100, and is provided on the other side of the seal rubber plate 100. A reinforcing plate 80 similar to that of the first embodiment is provided.
In the third embodiment, the length of the metal sleeve 51 provided for bolt insertion in the peripheral portion of the lid 50 is slightly longer than the thickness of the lid 50 so that the bottom portion 50 a of the lid 50 is flat and high at the center of the seal rubber plate 100. It can be brought into contact with the protruding tip portion 100a.
[0026]
Also in the third embodiment, the lid 50, the water stop device mounting member 60, the flanges 40a and 40b, the sealing rubber plate 100, the rib 90, and the reinforcing plate 80 are fixed together by bolts B in the same configuration and manner as in the first embodiment. Have been. As described above, in the third embodiment, a single sealing rubber plate 100 is used, so that it is possible to cope with the two-step propulsion construction method in the plumbing construction method.
Further, as in the second embodiment, the outer diameter of the seal rubber plate 100 may be formed large to further enhance the function of preventing the intrusion of the curing agent or the like.
Of course, if the protruding end portion 100a that can be cut off by the cutting groove 110 is cut off during the propulsion construction, the structure can be used as it is in a conventional one-step propulsion method.
[0027]
(Example 4)
In the fourth embodiment, as shown in FIG. 5, by forming the cut grooves 110 of the seal rubber plate 100 of the third embodiment with various diameters, it is possible to cut out corresponding to various pipe diameters. is there.
The fourth embodiment has the same configuration as that of the third embodiment except for the configuration of the seal rubber plate 200. As in the third embodiment, the disk-shaped seal rubber plate 200 is formed so that the thickness gradually decreases toward the center portion and gradually increases from the periphery, and the protruding end portion 200a is formed flat. Have been. A small hole 31 having a diameter slightly smaller than the diameter of the propulsion leading pipe is opened in the protruding end portion 200a so that the propulsion leading pipe can pass therethrough.
[0028]
In addition, the circular incision 210 that defines a flat portion around the small hole 31 is formed in a groove having a slightly thinner rubber thickness in that portion, and the portion can be cut in a circular shape. . The size of the protruding end portion 200a surrounded by the cut groove 210 is set according to the pipe diameter. Further, around the circular cut groove 210, circular cut grooves 220 and 230 are formed concentrically with the cut groove 210 and adapted to a larger pipe diameter, and the cutting range is changed according to the pipe diameter to be used. Thus, a hole having an appropriate diameter can be formed.
[0029]
Through the above Examples 1, 2, 3 and 4, the wellhead water stop A is formed in a circular shape in accordance with a generally used round tube, but if necessary, other used tube shapes such as a square tube are used. The shape may be adjusted according to the shape.
Further, the shape of the water stoppage mounting member 60 is not limited to the above embodiment, and various modifications may be made without departing from the gist of the present invention.
In the present invention, a small hole for the propulsion pipe or a hole for piping is previously formed in the seal rubber plate, but without providing a hole from the beginning, a structure in which only a cut groove that can be cut off at any time is provided. You can also.
[0030]
【The invention's effect】
According to the present invention, the manhole pipe can be laid without causing friction with the surrounding ground and without obstructing a device for excavating the earth and sand in the manhole pipe. It can be done by propulsion construction while preventing inflow into the manhole pipe. For this reason, the shaft formation conventionally performed with steel sheet piles can be replaced with a sinking method in which a manhole pipe is gradually settled while excavating to form a shaft, and the number of construction steps and the like can be reduced.
Furthermore, in the present invention, since the wellhead stoppage can be buried and killed as it is, the man-hour associated with the removal of the wellhead stoppage as in the prior art can be reduced, and the inflow of earth and sand into the shaft can be reliably prevented. be able to.
In particular, by increasing the outer diameter of the seal rubber plate or by providing an annular packing, the sealing performance between the well stop and the inner wall of the well is strengthened, so that the hardener and the like can be more reliably prevented from entering. Can be done.
In addition, since the seal rubber plate for the propulsion leading pipe and the seal rubber plate for the piping are combined, it is possible to provide a wellhead stop that can be used in a two-step propulsion method. In addition, by forming a cut groove in the seal rubber plate, a configuration in which one seal rubber plate can cope with the two-step propulsion method is provided. By forming the cut grooves concentrically, holes corresponding to various pipe diameters can be formed in the seal rubber plate at any time, so that the work efficiency can be improved by urgently responding to urgent work changes such as pipe changes. In addition, it is also possible to eliminate the waste of stocking seal rubber plates corresponding to holes of various diameters in advance.
[Brief description of the drawings]
FIG. 1 is a plan view (a) of a wellhead water stop according to a first embodiment, and a side cross-sectional view (b) taken along line AA of the plan view (a). Partial enlarged side sectional view (c) of the part circled in the side sectional view (b).
FIG. 2 is a partial cross-sectional view showing a state where the well stop device according to the first embodiment is installed in a pit.
FIGS. 3A and 3B are partial cross-sectional views showing how a wellhead water stop according to a second embodiment is installed in a pit.
FIG. 4 is a plan view (a) of a wellhead water stop according to a third embodiment, and a side cross-sectional view (b) taken along line AA of the plan view (a). Partial enlarged side sectional view (c) of the part circled in the side sectional view (b).
FIG. 5 is a plan view (a) of a wellhead water stop according to a fourth embodiment, and a partially enlarged side cross-sectional view (b) of a portion surrounded by a circle in the plan view (a).
FIG. 6 is a perspective view showing a state in which a wellhead water stop is attached to a manhole pipe.
FIG. 7 is an explanatory view of a laying method.
FIG. 8 is a partial plan view (a) showing a conventional wellhead water stop, and a side cross-sectional view (b) cut along line AA of the partial plan view (a).
[Explanation of symbols]
10 Manhole tube
20 wellhead
30a Seal rubber plate
30b Seal rubber plate
31 small hole
32 holes
40a flange
40b flange
50 lid
60 Water stop device mounting member
70a nut
70b nut
80 Reinforcement plate
81 packing
90 rib
100 Seal rubber plate
110 kerf
200 Seal rubber plate
210 Groove
220 kerf
230 kerf
A wellhead stop
B bolt

Claims (7)

A wellhead water stop device that provided the wellhead of through-pipe construction for applying a propulsion preceding tube and pipe are formed in the manhole tube is sinking into the ground by sinking method,
A flange assembled to the wellhead;
A hole through which a pipe propelled after propulsion of the propulsion preceding pipe is provided, and a seal rubber plate held by the flange,
Ri Na softer member fixed to the flange disposed on the outer surface of the wellhead, a lid covering without protrude the wellhead from the outer surface of the manhole tube,
A water stop device for a side hole of a manhole pipe , comprising: a reinforcing plate that is removably attached to the flange from the inside and supports the lid and the seal rubber plate against earth pressure . 2. The well stop device for a side hole of a manhole tube according to claim 1, wherein the water stop device is disposed within the wall thickness of the manhole tube without protruding from the inner surface and the outer surface of the manhole tube. The seal rubber plate is composed of a first seal rubber plate through which a propulsion leading pipe at the time of piping is penetrated, and a second seal rubber plate provided with a hole through which a pipe propelled after propulsion of the propulsion preceding pipe is provided. The well stop device for a side hole of a manhole pipe according to claim 1 or 2, wherein The seal rubber plate is provided with a small hole for a propulsion leading pipe at the time of piping construction, and a cut groove is formed outside the small hole to form a pipe hole through which a pipe propelled after propulsion of the propulsion leading pipe penetrates. The well stop device for a side hole of a manhole pipe according to any one of claims 1 to 3, characterized in that: The outer diameter of the seal rubber plate is formed to be larger than the inner diameter of the wellhead, and the outer edge portion of the seal rubber plate comes into close contact with the well when the well stop is attached to the well. 4. The pit stop for a manhole pipe side pit according to any one of the items 4 to 5. The well stop device for a side hole of a manhole pipe according to any one of claims 1 to 5 , wherein a packing closely contacting an inner peripheral surface of the well hole is attached to the flange. The well stop device for a manhole pipe side wellhead according to any one of claims 1 to 6 , wherein the lid is formed of foamed styrene resin or wood.

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