JP4989212B2 - Water-sealing hole method, hole-closing member, water-sealing hole unit, and water-sealing hole structure - Google Patents

Description

  This invention is to drill a part of the peripheral wall of a metal water pipe in order to attach a water stop cock that cuts off the water flow to the water pipe at the time of partial replacement or expansion of an existing water pipe. Water-sealing hole method for water pipe perforated part for water-tight closing after removing the water stop cock after construction, and the closing member and water-sealing hole unit used therefor, and its The present invention relates to a water-tight hole structure.

Conventionally, when constructing this type of water pipe, first, the water control valves at existing locations of the existing water pipe are tightened to shut off water over a wide area, and then the water pipe is replaced or expanded within a predetermined time. However, after the completion, it was usual to open the water control valve to allow water flow.
However, according to such an enforcement method, there are inevitably inconveniences such as water outage and red water at the time of restoration, muddy water, etc. in a wide area, and factories that require a large amount of water, including ordinary households in that area This will result in a great deal of trouble for hospitals.

  In order to solve such problems, a through hole having a diameter slightly smaller than the inner diameter is formed in a part of the peripheral wall in the vicinity of a construction portion of an existing metal (generally iron) water pipe. After inserting the valve body made of hard rubber of the stop cock through the hole, the outer peripheral surface of the valve body is bulged outward by pressing the valve body from above, and the outer part of the valve body is placed on the inner surface of the water pipe A construction method using a water faucet has been developed in which the water pipe is completely sealed so that the water pipe is completely sealed so that only the minimum necessary part is stopped.

The inventor of the present application first invented a water tap for a water pipe described in Patent Document 1 for use in such a construction method. This water stop valve is composed of a strong material inner and outer cylinders and a sealing member made of soft rubber molded so that the inner and outer cylinders are integrated into a water pipe. Since a strong water pressure is received by the strong inner and outer cylinders and the inner surface of the water pipe is tightly contacted by a soft seal member, complete water stop can be realized with a small pressing force.
Japanese Patent No. 3658161

However, in the conventional water pipe construction method using such a water faucet, when the water faucet is removed after construction, the through-hole formed in the peripheral wall of the water pipe withstands a strong water pressure and closes water tightly. However, the valve body of the stop cock is pulled up from the inside of the pipe to make it possible to pass water, but it is buried in the water pipe with the stop cock attached in a watertight state. It was.
Therefore, since the water stop cock can be used only once, the construction cost increases, and red rust is generated at the perforated portion of the through hole, which may deteriorate the quality of tap water. In addition, since the water stopcocks that are still attached to the water pipe protrude from the outer periphery of the water pipe and are buried in the upper part, other water pipes, gas pipes, buried cables, etc. are excavated for repair or replacement. At that time, the water stop cock was caught by a power shovel or the like to cause damage, which could cause unexpected water leakage.

  This invention was made in order to solve the above problems, and in a water pipe construction method using a water faucet, the water faucet was removed after construction, and a through hole formed in the peripheral wall of the water pipe It can withstand strong water pressure and can be closed and buried tightly, and it can be used repeatedly, reducing construction costs, preventing red rust, and other buried objects The purpose is to eliminate the risk of water leakage due to breakage of the stop cock during construction.

  In order to achieve the above object, the water sealing hole method for a perforated portion of a water pipe according to the present invention is provided in a through hole formed by drilling to attach a water stop cock to a part of a peripheral wall of a metal water pipe. After removing the faucet, cover at least the concave curved surface corresponding to the inner surface of the peripheral wall and the outer peripheral side surface of the metal piece cut out when the through hole is drilled from the peripheral wall or the metal piece having the same shape as the metal piece. A closed hole member fitted with a sealing material having elasticity such as rubber is fitted with the concave curved surface side inside, and the closed hole member is attached to the outer periphery of the water pipe by the support member. The through hole is closed in a watertight manner by being supported in a direction along the central axis of the hole.

Further , the water sealing hole unit for a water pipe perforated portion according to the present invention is a metal cut out when a through hole for attaching a water stop cock is drilled in a part of a peripheral wall of a metal water pipe. Or a metal piece having the same shape as the metal piece, and an elastic sealing material such as rubber fitted to cover at least the concave curved surface corresponding to the inner surface of the peripheral wall and the outer peripheral side surface of the metal piece. The closed hole member is fitted into a cylindrical portion concentric with the center line of the through hole provided in the support member attached to the outer periphery of the water pipe, and is water-tight with respect to the cylindrical portion and on the center line. It comprises a disk-like support that is supported immovably in the direction along, and the closed hole member is supported by the disk-like support so that the distance in the direction along the center line can be adjusted.

  Furthermore, the water sealing hole structure of the perforated part of the water pipe according to the present invention is attached to the outer periphery of the water sealing hole unit and the metal water pipe, and the cylindrical part concentric with the center line of the through hole is passed through the transparent part. It consists of a support member provided with a sealing material between the periphery of the hole and a water leakage prevention protective cap that is screwed and fixed to the opening of the cylindrical portion. Then, the disc-shaped support body of the water-sealing hole unit is fitted into the cylindrical portion of the support member, and the disc is supported in a watertight manner with respect to the cylindrical portion and stationary in the direction along the center line. The closed hole member is fitted to the through hole of the water pipe with the concave curved surface on the inside by a cylindrical support, and is fixedly supported in a direction along the central axis of the through hole to close the through hole in a watertight manner. The water leak prevention protective cap is screwed and fixed to the opening of the cylindrical portion.

  According to this invention, in construction such as replacement or expansion of a water pipe that uses a water faucet, the water faucet is removed after construction, and the through hole formed in the peripheral wall of the water pipe is closed tightly by the closing member. Since the water stop cock can be used many times, the construction cost can be reduced and red rust can be prevented from being generated in the through hole portion of the water pipe. Furthermore, when other buried objects are constructed, there is no possibility of leakage due to damage to the water stop cocks that are buried in the water pipes.

Hereinafter, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
FIG. 1 is a side view showing a partial cross section of an embodiment of a water sealing hole structure of a perforated portion of a water pipe according to the present invention. In FIG. 1, the disk-like support body of the water leakage prevention protective cap and the water sealing hole unit has a right half portion as a secondary cross section, but the hole closing member is not in a cross section. FIG. 2 is a cross-sectional view taken along line AA before mounting the water leakage prevention protective cap in the water hermetic hole structure shown in FIG. FIG. 3 is a side view showing details of the water-sealing hole unit shown in FIGS. 1 and 2 with the right half portion being a secondary section.

First, the process of stopping and constructing a water pipe as in the prior art will be briefly described.
Perforations not shown in the upper part of the peripheral wall in the vicinity of the construction part of a metal (generally iron) water pipe that is buried almost horizontally during construction such as partial replacement or expansion of an existing water pipe A through hole 1b having a diameter slightly smaller than the inner diameter R of the water pipe 1 shown in FIG. A water stop cock as described in the above-mentioned Patent Document 1 is attached and fixed together with the insertion machine and the work gate valve in a watertight manner at a portion where the through hole 1b of the water pipe 1 is formed.

Referring to FIG. 1 and FIG. 2, the outer periphery of the portion of the water pipe 1 that is desired to be water-stopped is divided into a pair of semi-cylindrical upper half portions 21 of the 20% T-shaped tube 2 that is a base support member. Cover the lower half 22 so as to be sandwiched from above and below, and extend the extending portions 21a, 22a extending horizontally from the respective side edges with a plurality of bolts 23 and nuts 24 to the outer periphery of the water pipe 1. The water pipe 1 is fixed to the outer periphery of the water pipe 1 with a plurality of set screws 25 that are screwed radially in the vicinity of both ends in the longitudinal direction. An opening 21b having an inner diameter somewhat larger than the inner diameter of the through hole 1b is provided at a position corresponding to the portion of the upper half 21 of the 20% T-shaped pipe 2 where the through hole 1b of the water pipe 1 is drilled. The cylindrical portion 21c having an inner diameter projects outwardly so that the central axis L2 thereof is orthogonal to the central axis L1 of the water pipe 1.

Further, the total length of each side edge of the upper half 21 and the lower half 22 of the 20% T-shaped tube 2, the entire half circumference near both ends in the longitudinal direction, and the whole circumference near the opening 21 b of the upper half 21. And a peripheral wall 1a of the water pipe 1 with seal members 26a, 26b, 27a, 27b, 28 made of an elastic material such as rubber (hereinafter also including synthetic rubber), respectively, It adheres to the surface in a watertight manner.
A male screw 21d is formed on the outer periphery of the cylindrical portion 21c, and a cylinder with a flange for connection (not shown) is screwed and fixed thereto, and a work partition valve is fixed to the flange, and the work partition is provided. Attach the drilling machine to the valve housing flange in a watertight manner.

  Then, with the working gate valve opened, the drilling blade of the drilling machine is lowered while rotating, and drilled into the peripheral wall 1a of the water pipe 1 to form a through hole 1b whose planar shape is concentric with the opening 21b. To do. Thereafter, the perforating blade is raised together with the metal piece of the perforated part cut out from the peripheral wall 1a, the work gate valve is closed to prevent water leakage, and the perforator is removed from the work gate valve. The metal piece taken out at this time is used as a reinforcing member for a closing member described later according to the present invention.

  Next, an insertion machine with a built-in stop cock is attached to the casing flange of the above-mentioned work gate valve in a watertight manner, the work gate valve is opened and the stop cock is lowered by the insert machine, and the valve body case of the stop cock These flanges are brought into contact with the flanges of the connecting flanged cylinders with a sealing material interposed therebetween, and both flanges are fixed with connecting bolts. Furthermore, the valve body of the stop cock is lowered by the insertion machine and inserted into the water pipe 1 from the through hole 1b, and the valve body is brought into close contact with the entire circumference of the peripheral wall 1a to block the flow of water in the water pipe 1. To do. With this water stopped, construction such as replacement or expansion of the water pipe ahead is performed.

When the construction is completed, the valve body of the water stop valve is raised and retracted outside the through hole 1b to release the water stop, and then only the insertion machine and the work gate valve are removed from the flanged cylinder. In order to prevent the tap water from flowing out of the through hole 1b, the water stop cock was buried in the ground together with the water pipe 1 while being fixed to the flanged cylinder body in a watertight manner.
Therefore, various problems have occurred as described above. Therefore, if the present invention is carried out, the through-hole 1b drilled in the water pipe 1 can be closed tightly in a watertight manner by the closing member 11, and the water pipe 1 can be backfilled in the ground with the stop cock removed. It becomes like this.

Therefore, a water sealing hole method for a perforated portion of a water pipe according to the present invention will be described with reference to FIGS.
According to the embodiment of the present invention, when the construction of the water pipe is completed, the valve body of the water stop cock is raised and retracted outside the through hole 1b to release the water stop of the water pipe 1, and then the water stop cock The sticking of the valve body case and the flanged cylinder by the connecting bolt is released, and the stop cock is lifted upward from the work partition valve by the insertion machine, and the work partition valve is closed to prevent water leakage.
Thereafter, the insertion machine is once removed from the housing flange of the working gate valve, the water stop cock is taken out, the water sealing hole unit 10 shown in FIG. It sticks to.

  Then, the working gate valve is opened, the water sealing hole unit 10 is lowered by the insertion machine, and is inserted into the cylindrical portion 21c of the upper half portion 21 of the 20% T-shaped tube 2. The water sealing hole tool The closed hole member 11 of the unit 10 is fitted to the through hole 1b of the water pipe 1 and pressed, and supported by a mechanism described later in a watertight manner with respect to the cylindrical portion 21c and in a direction along the central axis L2 of the through hole 1b. Let Thereby, the closing member 11 of the water sealing hole unit 10 closes the entire through hole 1b by bringing the sealing material into close contact with the inner peripheral surface of the through hole 1b, and closes the through hole 1b in a watertight manner.

Thereafter, the insertion rod of the insertion machine is reversed to release the screw connection with the water-sealing hole unit 10, and the insertion machine is removed from the housing flange of the work gate valve. It is removed from the cylindrical portion 21c of the 20% T-shaped tube 2. This state is shown in FIG.
Then, on the outer periphery of the cylindrical portion 21c after removing the flanged cylindrical body, the female screw 5a of the water leakage prevention protective cap 5 is screwed into the male screw 21d, and the water leakage prevention protective cap 5 is sealed in the cylindrical portion 21c. Seal with and attach. FIG. 1 shows a water sealing hole structure in a state where the hole closing operation of the perforated part of the water pipe is completed.

Here, details of the water sealing hole unit 10 used in this embodiment will be described with reference to FIG.
The water-sealing hole unit 10 is roughly divided into a closing hole member 11 and a disk-like support body 12, both of which are connected by a connecting male screw 19, and are positioned and fixed at a predetermined interval by a fixing nut 20. Has been.

  As described above, when the through hole 1b is drilled in the peripheral wall 1a of the steel water pipe 1 by a punching machine, the closing member 11 has the same shape as the metal piece 11a cut out from the peripheral wall 1a or the metal piece. A metal piece is prepared and used as a reinforcing material, and a sealing material 11b having elasticity such as rubber so as to cover at least the concave curved surface corresponding to the inner surface of the peripheral wall 1a and the outer peripheral side surface (see FIG. 2) of the metal piece 11a. It is constructed by fitting. The sealing material 11b is formed in a size and shape matching the diameter of the water pipe 1 and the inner diameter of the drilling blade for drilling the through hole 1b so that the metal piece 11a can be fitted by an elastic material such as rubber, The metal piece 11a is fitted. A female screw 11c into which the connecting male screw 19 is screwed is formed at the center of the upper surface of the metal piece 11a.

  The disk-like support 12 is also made of metal such as iron (including stainless steel), and has a small diameter in which a lower female screw hole 12a is formed at the center of the lower surface and an upper female screw hole 12b is formed at the central portion of the upper surface. A portion 12c is provided. One end of a connecting male screw to which the nut 20 is screwed is screwed into the lower female screw hole 12a, and the other end is screwed into a female screw 11c formed in the metal piece 11a of the closing member 11. Tightened and fixed at 20. In the illustrated example, only one nut 20 is used, but it is also possible to use two nuts and fix them by arbitrarily adjusting the distance between the disc-like support 12 and the closed hole member 11.

  An annular groove is formed on the outer peripheral surface of the disk-like support body 12, and an O-ring 13 made of an elastic material such as rubber is fitted therein. In addition, a drive ring 14 is fitted on the outer periphery of the small diameter portion 12c so as to be relatively rotatable. On the outer peripheral surface, hemispherical protrusions 14a are provided at four locations at intervals of 90 ° in the circumferential direction, and on the upper end surface. Is formed with an uneven surface 14b into which an annular uneven surface formed on the outer peripheral portion thereof is fitted when the distal end portion of an insertion rod (not shown) is screwed into the upper female screw hole 12b.

  Furthermore, grooves are formed at four locations at 90 ° intervals in the circumferential direction radially with respect to the central axis on the upper portion of the disk-shaped support body 12, and the fixing pins 15 are inserted therein. A presser plate 16 is fixed to the disc-like support 12 by four fixing screws 17 so as to cover the upper surface. In FIG. 3, the fixing screw 17 and the fixing pin 15 are shown in the same longitudinal section for convenience, but in actuality, the fixing screw 17 and the fixing pin 15 are provided at positions shifted by 45 ° in the direction.

The inner end portion of each fixing pin 15 is formed in a hemispherical shape having a diameter larger than that of the shaft portion, and each fixing pin 15 is always urged toward the center by a coil spring 18 inserted into the outer periphery of the shaft portion. Yes. And, normally because of the position where each hemispherical projections 14a of the drive ring 14 is displaced in the circumferential direction relative to the fixed pin 15, the fixing pin 15 is moved toward the center by the urging force of the coil spring 18 Thus, it is in a position that does not protrude from the outer peripheral surface of the disc-like support 12.

  The water sealing hole unit 10 configured in this manner is screwed into the tip of the insertion rod in the insertion machine after removing the water stop cock as described above, and is attached to the 20% T-shape shown in FIGS. By the flanged cylinder (not shown) screwed and fixed to the cylindrical upper part 21c of the upper half 21 of the pipe 2, and the work gate valve and insertion machine attached thereto, the water overflowing from the through hole 1b of the water pipe 1 On the other hand, the insertion rod of the insertion machine is lowered while keeping watertight.

Then, the water sealing hole unit 10 is inserted into the cylindrical portion 21c, the closing member 11 is rotated and pressed to a position that fits the through hole 1b of the water pipe 1, and the sealing material 11b is inserted into the through hole. Compressed in close contact with the inner peripheral surface of 1b, the entire through hole 1b is sealed and watertightly closed. Further, the O-ring 13 is brought into close contact with the outer peripheral surface of the disc-like support 12 and the inner peripheral surface of the cylindrical portion 21c, and the gap is also sealed.
When the insertion rod in the insertion machine is reversed in this state, the closing member 11 of the water sealing hole unit 10 and the disc-like support 12 do not rotate integrally, and the insertion rod is screwed into the disc-like support 12. Rotate so that it comes out.

At this time, the drive ring 14 is fitted with the outer peripheral portion of the insertion rod is rotated, the hemispherical protrusions 14a is the same position as the fixed pin 15, the fixed pin by the hemispherical projection 14a 15 is moved outward against the urging force of the coil spring 18 and protrudes from the outer peripheral surface of the disk-like support 12 to fit into an annular groove formed on the inner peripheral surface of the cylindrical portion 21c.
And thus, the water sealing hole tool unit 10 is supported rigidly in the direction along the central axis L2 of the watertight and hole 1b to the cylindrical portion 21c.

  Thereafter, when the insertion machine, the work gate valve, and the flanged cylinder are removed from the cylindrical portion 21c of the 20% T-shaped tube 2, the state shown in FIG. 2 is obtained, and the water leakage prevention protective cap 5 is attached to the cylindrical portion 21c. As described above, by screwing and mounting, the closing operation of the perforated portion of the water pipe shown in FIG. 1 is completed.

  Thus, the closed hole member 11 according to this embodiment has a metal piece 11a cut out from the peripheral wall 1a when the through hole 1b is drilled in the peripheral wall 1a of the steel water pipe 1 by a punching machine (those cut this time). However, it may be provided at a low cost since it may be used as a reinforcing material (which may be cut out when a through-hole of the same size is previously drilled in a water pipe of the same diameter). In addition, the metal piece 11a has the same thickness and inner and outer curved surface shape as the peripheral wall 1 of the water pipe 1, and has a shape similar to the through hole 1b and smaller by the margin of cut. As a result, the sealing material 11b is somewhat compressed into the through-hole 1b of the water pipe 1 and fits perfectly, and has sufficient strength.

And each fixing pin 15 of the water-sealing hole unit 10 is fitted into an annular groove formed on the inner peripheral surface of the cylindrical portion 21c, and is fixedly supported in a direction along the central axis L2 of the through hole 1b. Therefore, it can sufficiently withstand the water pressure in the water pipe 1 that reaches a maximum of 7 kg / cm ² (6.7 Mpa). Even if there is a slight amount of water from between the through hole 1b and the closed member 11, the seal between the outer peripheral surface of the disk-like support 12 and the inner peripheral surface of the cylindrical portion 21c by the O-ring 13 is used. In addition, since the seal between the cylindrical portion 21c and the water leakage prevention protective cap 5 by the sealing material 6 is made, water cannot leak to the outside.

  And after the construction of the water pipe using a conventional water stopcock, the inner peripheral surface which is the cut surface of the through hole was exposed in water, which was the main cause of red rust, according to this invention As shown in FIG. 2, the sealing material 11b of the closed hole member 11 is closely attached to the inner peripheral surface that is the cut surface of the through hole 1b so as to prevent water from entering the cut surface of the through hole 1b. The occurrence of red rust can be effectively prevented.

In addition, the water stop cock can be removed after construction, and the through hole 1b formed in the peripheral wall of the water pipe 1 can withstand strong water pressure and can be buried tightly and buried by the water sealing hole unit 10. Since the faucet can be used many times, the construction cost can be reduced, and there is no risk of water leakage due to damage to the faucet during construction of other buried objects.
Note that the present invention is not limited to the above-described embodiment, and various modifications are possible as long as the configuration described in each claim is included.

This invention is formed by perforating a part of the peripheral wall of a metal water pipe in order to attach a water stop cock that cuts off the flow of water to the water pipe during construction such as partial replacement or expansion of the water pipe. Can be used to close water tightly after removing the stop cock after construction, and is extremely effective for reducing costs of waterworks, preventing red rust after construction, and preventing damage due to other construction. It is.
In addition, if a water pipe is a metal pipe, it can apply to the thing of various diameters including a large diameter pipe, and can apply not only to a water supply pipe or a water distribution pipe but to a drain pipe .

It is a side view which partially shows one Embodiment of the water sealing hole structure of the perforation part of the water pipe by this invention in a subordinate cross section. It is sectional drawing which follows the AA line before mounting | wearing with the water leak prevention protective cap in the water sealing hole structure shown in FIG. It is a side view which shows the detail of the water-sealing hole unit shown in FIG.1 and FIG.2 by making a right half part into a secondary section.

Explanation of symbols

1: Water pipe 1a: Perimeter wall 1b: Through hole 2: 20% T- shaped pipe
5: Water leakage prevention protective cap 6: Sealing material 10: Water sealing hole unit 11: Closing member 11a: Metal piece (reinforcing material)
11b: Sealing material fitted to the metal piece 11c: Female screw hole 12: Disk-like support 12a: Lower female screw hole 12b: Upper female screw hole 12c: Small diameter portion 13: O-ring 14: Drive ring 14a: Hemispherical protrusion 14b: fitting portion 15: fixing pin 16: presser plate 17: fixing screw 18: coil spring 19: male screw for connection 20: fixing nut 21: upper half portion of 20% T-shaped tube 21a: extension Installation part 21b: Opening part 21c: Cylindrical part 22: Lower half part of 20% T-shaped tube 22a: Extension part
23: Bolt 24: Nut 25: Set screw
26a , 26b, 27a, 27b, 28: Sealing material

Claims (3)

  A metal piece cut out when the through hole is drilled from the peripheral wall after removing the stop cock in the through hole formed by drilling to attach the stop cock to a part of the peripheral wall of the metal water pipe Or a closed hole member fitted with a sealing material having elasticity such as rubber so as to cover at least the concave curved surface corresponding to the inner surface of the peripheral wall and the outer peripheral side surface of the metal piece having the same shape as the metal piece, The support member attached to the outer periphery of the water pipe is fixedly supported in a direction along the central axis of the through hole, and the through hole is closed in a watertight manner. A water sealing hole method for a perforated part of a water pipe, characterized by A metal piece cut out when a through hole for attaching a water stop cock is drilled in a part of a peripheral wall of a metal water pipe or a metal piece having the same shape as the metal piece, and at least the metal piece A closed hole member made of a sealing material having elasticity such as rubber fitted so as to cover the concave curved surface corresponding to the inner surface of the peripheral wall and the outer peripheral side surface;
Fits into a cylindrical part concentric with the central axis of the through hole provided in a support member attached to the outer periphery of the water pipe, and is immovable in a direction that is watertight with respect to the cylindrical part and along the central axis. And a disk-like support supported by
A water-sealed hole unit for a water pipe perforated portion, wherein the disk-shaped support member supports the hole-closing member so that the interval in the direction along the center line can be adjusted. The water-sealing hole unit according to claim 2 ,
A support member attached to the outer periphery of a metal water pipe, and provided with a cylindrical member concentric with the center line of the through hole between the periphery of the through hole,
It consists of a water leakage prevention protective cap screwed and fixed to the opening of the cylindrical part,
The disk-shaped support of the water-sealing hole unit is fitted into the cylindrical part of the support member, and the disk is supported in a water-tight manner and in a direction along the center line with respect to the cylindrical part. The closed hole member is fitted into the through hole of the water pipe with the concave curved surface on the inside by means of a cylindrical support to close the through hole in a watertight manner, and the leakage preventing protection is provided at the opening of the cylindrical part. A water sealing hole structure for a perforated portion of a water pipe, wherein a cap is screwed and fixed.

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