JP4363591B2 - Water stop method and water stop device for branch pipe - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a water stop method and a water stop device used therefor for reliably and simply stopping water when removing a branch pipe extending from a branch joint attached to a water main or the like.

  In order to connect the branch branch pipe to the water main pipe in an uninterrupted state, a branch joint with a gate valve is usually used, and when the branch pipe is connected or removed and replaced, By closing and temporarily blocking the flow of water flowing from the main water pipe into the branch pipe of the branch joint, the workability at the time of attaching and detaching the branch pipe can be improved.

  Also, when removing the branch pipe because it becomes unnecessary, it is necessary to leave the branch joint attached to the water main pipe and stop the branch pipe, For example, it was performed by the water stop apparatus described in Patent Document 1.

JP-A-63-13997

  In the water stop device described in Patent Document 1 and the water stop method using the water stop device, a complicated and large water stop device is used, which increases the manufacturing cost and requires a lot of man-hours to stop the water. And work efficiency is bad.

  In addition, since the gate valve is opened and closed, if the gate valve malfunctions, that is, it is buried in the ground for a long time, for example, and the screw for opening and closing the gate valve is rusted and cannot be rotated or rotated. If the gate valve is not completely closed due to stopping during movement, for example, the water cannot be stopped using the water stop device.

  In such a case, it is necessary to remove the branch branch pipe (bypass pipe) with water flowing out from the branch pipe, and then shut off the water by closing the open end of the branch pipe with a stopper or a blocking plate. is there.

  However, in such a method, when the water pressure is particularly high, the water stopping operation becomes difficult, for example, the water ejected from the branch pipe is scattered around and the worker covers a large amount of water.

  Such a problem occurs when a branch pipe is directly coupled to a water main pipe without a branch joint or gate valve and the branch pipe connected to the branch pipe is removed and then the branch pipe is stopped. Also occurs.

  The present invention has been made in view of the above problems, and even if the gate valve cannot be opened or closed, or even if it is a branch pipe not equipped with the gate valve, its water stop operation can be easily and reliably performed. It is an object of the present invention to provide a water-stopping method and a water-stop device for a branch pipe that can be performed.

In order to solve the above-mentioned problem, the water stop method for a branch pipe according to claim 1 of the present invention is connected by screwing to a female screw on the inner peripheral surface of the open end of the branch pipe attached to a water main pipe or the like. After the branch pipe is removed, when the tip of the water stop plug is screwed onto the female screw of the branch pipe, the water flowing out from the branch pipe is surrounded by the required gap between the front and rear outer peripheral surfaces of the water stop plug. It is received by the front inner peripheral surface of the water shield cover, and is discharged from the drain hole facing the radial direction of the rear end through the hollow hole inside the water stop plug and received by the rear inner peripheral surface of the water shield cover, After the end of the water stop plug has been screwed, a water stop cap is attached to the rear end of the water stop plug to seal the drain hole. Finally, the water shield cover is attached to the water stop plug from the water stop plug. It is characterized by removal.
According to this feature, when the water stop plug is screwed onto the internal thread of the branch pipe, the water flowing out from the branch pipe can be received by the front and rear inner peripheral surfaces of the water protection cover, and therefore discharged backward. The water pressure applied is weakened, so that the water stop plug and the water stop cap can be attached and the water stop operation can be easily performed. Further, since the water-proof cover is removed after the water stoppage, the opening end of the branch pipe does not expand in the radial direction, and a compact water-stopping state is obtained.

The water stop device for a branch pipe according to claim 2 of the present invention has a male screw portion that can be screwed into a female screw formed on the inner peripheral surface of the open end of the branch pipe at the tip portion, and the tip surface of the male screw portion. A water stop plug that has a hollow hole that is open to the outer peripheral surface of the water stop plug, and a water drain hole that communicates with the hollow hole and opens in the outer peripheral surface of the rear end portion in the radial direction. A water-proof cover that is detachably mounted, surrounding the outer peripheral surface with a predetermined gap, and a water-stop cap that is attached to the rear end of the water-stop plug so as to seal the drain hole. It is characterized by that.
According to this feature, the branch pipe can be water-stopped easily and reliably with only three simple members having the structure of the water-stop plug, the water-proof cover and the water-stop cap. Moreover, a water stop apparatus can be manufactured cheaply.

A water stop device for a branch pipe according to claim 3 of the present invention is the water stop device for a branch pipe according to claim 2, wherein an outer diameter of the male screw portion is formed at a tip of the male screw portion in the water stop plug. It is characterized by a slightly small diameter guide part.
According to this feature, even if the opening of the branch pipe cannot be directly visually observed, the male screw part of the water stop plug can be guided by the guide part and can be easily screwed into the female screw of the branch pipe.

A water stop device for a branch pipe according to claim 4 of the present invention is the water stop device for a branch pipe according to claim 2 or 3, wherein a large-diameter portion is provided at an intermediate portion of the outer peripheral surface of the water stop plug. The water shield cover is detachably attached to the outer peripheral surface of the water stop plug by screwing the female screw hole formed in the partition wall on the inner peripheral surface of the water shield cover with the male screw formed on the outer peripheral surface thereof. It is a feature.
According to this feature, a required space is formed between the outer peripheral surface of the water blocking plug and the inner peripheral surface of the water blocking cover, and the water blocking cover can be easily attached to and detached from the outer peripheral surface of the water blocking plug. Can be installed on.

A water stop device for a branch pipe according to claim 5 of the present invention is the water stop device for a branch pipe according to any one of claims 2 to 4, wherein a male screw is provided on the outer peripheral surface of the rear end of the water stop plug. The water stop cap is attached to the rear end portion of the water stop plug by forming and screwing a female screw on the inner peripheral surface of the water stop cap into the male screw.
According to this feature, the water stop cap can be easily attached to the water stop plug.

The water stop device for a branch pipe according to claim 6 of the present invention is the water stop device for a branch pipe according to claim 4 or 5, wherein the water stop plug is in contact with the tip surface of the water stop cap. It is characterized in that a packing is provided between the side end face of the large diameter portion.
According to this feature, even if the pressure of water flowing out from the branch pipe is high, the branch pipe can be reliably stopped.

A water stop device for a branch pipe according to claim 7 of the present invention is the water stop device for a branch pipe according to any one of claims 2 to 6, wherein the rear end portion of the water stop plug and the water stop cap is provided. In addition, a polygonal head that can be rotated by inserting a rotary tool is provided.
According to this feature, the water stop plug and the water stop cap can be firmly and securely tightened using the rotating tool.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are considered to be the best of the present invention will be described below with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes a branching half joint which is attached to the outer peripheral surface of a water main pipe 2 in a sealed manner so as to surround a branch hole 3 drilled in the water main pipe 2, and faces a direction orthogonal to the water main pipe 2. The branch pipe 4 is attached with a gate valve 5 in which a valve body (not shown) that opens and closes a flow path in the branch pipe 4 by an external operation is accommodated.

  A female screw 6 is formed on the inner peripheral surface of the opening end of the branch pipe 4, and a branch pipe 7 for branching is screwed into the female screw 6 with a male screw (not shown) formed on the outer peripheral surface of the end. By being connected.

  Reference numeral 8 denotes a water stop device of the present invention, which includes a water stop plug 9, a water cover 10, and a water stop cap 11, as shown in the enlarged half sectional view of FIG.

  The water stop plug 9 includes a large-diameter portion 12 formed at a substantially central portion in the axial direction, and a taper-shaped male screw portion 13 formed on the left side thereof, which can be screwed into the female screw 6 of the branch pipe 4. A small-diameter portion 14 on the right side of the large-diameter portion 12 and a hexagonal head 15 connected to the right end (rear end) of the large-diameter portion 12, an outer peripheral surface excluding the left end portion of the large-diameter portion 12, and a small-diameter A male screw 16 is formed on the outer peripheral surface of the portion 14.

  A guide portion 17 having a slightly smaller diameter than the outer diameter and a tapered outer peripheral surface of the distal end portion is connected to the distal end of the male screw portion 13.

  Inside the water stop plug 9 excluding the head 15, a hollow hole 18 is formed in the distal end surface of the guide portion 17. The small diameter portion 14 has a radial direction orthogonal to the axis of the water stop plug 9. A drain hole 19 is formed so as to face the hollow hole 18 and communicate with the hollow hole 18.

  The above-mentioned water-proof cover 10 has a cylindrical shape with both front and rear ends that are substantially equal to the length of the water stop plug 9, and the inner diameter thereof is sufficiently larger than the maximum outer diameters of the water stop plug 9 and the water stop cap 11. The dimensions are large so that the outer peripheral surfaces of the water stop plug 9 and the water stop cap 11 can be surrounded with a margin.

  The water shield cover 10 is secured by screwing a female screw hole 20 formed at the center of the partition wall 10a at an approximately middle portion of the inner peripheral surface thereof into the male screw 16 of the large diameter portion 12 from the small diameter shaft 14 side. The water plug 9 is detachably attached so as to surround the entire outer peripheral surface.

  The water stop cap 11 has a cap nut shape with an internal thread 21 formed on the inner peripheral surface, and a hexagonal head 22 is integrally connected to the right end (rear end). The female screw 21 of the water-stop cap 11 is perforated in the small-diameter portion 14 by screwing the female screw 21 with the male screw 16 of the small-diameter portion 14 of the water-stop plug 9 until the front end surface contacts the side end surface of the large-diameter portion 12. The drain hole 19 is sealed by the water stop cap 11.

  An annular groove 23 is formed on the side end surface of the large-diameter portion 12. By pressing a packing 24 such as an O-ring fitted in the groove 23 with the front end surface of the water stop cap 11, It is possible to completely prevent the water that has entered the threaded portion with the female screw 21 from leaking to the outside.

  Next, a method for water-stopping the branch pipe 4 using the water-stop device 8 will be described with reference to FIGS. FIG. 3 is a longitudinal side view of a branch pipe with a water stop plug and a water shield cover attached, FIG. 4 is a vertical side view of a water stop plug with a water stop cap attached, and FIG. It is a side view of the water stop completion state which removed the shade cover.

  As described above, when the branch pipe 7 connected to the water main pipe 2 is removed and then the branch pipe 4 is stopped, the gate valve 5 is malfunctioning and water can be stopped by that. It may disappear. In this case, the water can be easily stopped using the water stop device 8.

  First, as shown in FIG. 3, the male screw portion 13 of the water stop plug 9 to which the water shielding cover 10 is previously attached is connected to the female screw 6 of the branch pipe 4 from which the branch pipe 7 is removed, and the hexagonal head 15 is attached. Turn and screw in with a rotating tool.

  At this time, a guide portion 17 having a smaller diameter and a tapered outer peripheral surface is formed at the tip of the male screw portion 13, so that the opening of the branch pipe 4 is not visible. The male screw portion 13 can be easily screwed into the female screw 6. Further, since the male screw portion 13 has a tapered shape, water does not leak from a screwed portion between the male screw portion 13 and the female screw 6 of the branch pipe 4.

  Since the water flowing out from the branch pipe 4 is screwed out while being discharged to the outside through the hollow hole 18 and the drain hole 19 of the water stop plug 9, the resistance of the water pressure applied to the water stop plug 9 is reduced, and the mounting work is easy. Become. In addition, the periphery of the water stop plug 9 is surrounded by a cylindrical water-proof cover 10, and water flowing out from the outer peripheral surface of the male screw portion 13 when screwed into the male screw portion 13, as indicated by an arrow, The water that flows from the front inner peripheral surface in the direction of the water main 2 and flows out in the radial direction through the drain hole 19 is discharged from the rear inner peripheral surface of the water covering 10 in the direction opposite to the water main. Therefore, it is not scattered around and workability is improved.

  After the water stop plug 9 and the water shield cover 10 are attached to the branch pipe 4, as shown in FIG. 4, the water stop cap 11 and the head 22 of the male screw 16 of the small diameter shaft 14 of the water stop plug 9 are attached. The water drainage hole 19 is hermetically sealed by screwing it with a rotating tool and bringing the front end surface into contact with a packing 23 (see FIG. 2) fitted in the concave groove 23 on the side end surface of the large diameter portion 12. Also in this case, since water flows out from the drain hole 19 in the radial direction, the water pressure does not act on the water stop cap 11 and the mounting thereof becomes easy.

  Finally, as shown in FIG. 5, if the water shielding cover 10 is removed from the water stop plug 9, the water stop operation of the branch pipe 4 is completed.

  The present invention is not limited to the above embodiment.

  In the water stop device of the above embodiment, the water shield cover 10 is screwed into the external thread 16 on the outer peripheral surface of the large diameter portion 12 of the water stop plug 9 with the female screw hole 20 formed in the partition wall 10a on the inner peripheral surface thereof. In this way, the water stop plug 9 is detachably attached to the outer peripheral surface of the water stop plug 9, but without the female screw hole 20 or the male screw 16, the outer peripheral surface of the large-diameter portion 12 is formed in the partition wall 10 a. The joint hole may be simply fitted so as to be slidable.

  Moreover, the water stop cap 11 can also be fitted to the small diameter portion 14 of the water stop plug 9 by means such as press fitting, instead of the mounting form by screws.

  The present invention is a branch pipe directly connected to a branch pipe without a half joint 1 and a gate valve 5 such as the above, for example, a water main pipe 2 by welding or a flange in advance and connected to the branch pipe. The present invention can also be applied to the case where the branch pipe is stopped after the pipe is removed in an uninterrupted state.

It is a side view which cuts and shows a part of water stop device of the present invention and a branch pipe with a gate valve to which it is attached. It is an expanded half sectional view of the state which assembled | attached the structural member of the water stop apparatus of this invention. In the water stop method of this invention, it is a vertical side view of the state which attached the water stop plug and the water-proof cover to the branch pipe. Similarly, it is a vertical side view of a state in which a water stop cap is attached to a water stop plug. Similarly, it is the side view of the water stop completion state which removed the water shielding cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Half joint for branch 2 Water main pipe 3 Branch hole 4 Branch pipe 5 Gate valve 6 Female thread 7 Branch pipe 8 Water stop device 9 Water stop plug 10 Water shielding cover 10a Bulkhead 11 Water stop cap 12 Large diameter part 13 Male thread part 14 Small-diameter portion 15 Head 16 Male screw 17 Guide portion 18 Hollow hole 19 Drain hole 20 Female screw hole 21 Female screw 22 Head 23 Annular groove 24 Packing

Claims (7)

  After removing the branch pipe connected by screwing into the female thread on the inner peripheral surface of the opening end of the branch pipe attached to the water main pipe, etc., the tip of the water stop plug is screwed into the female thread of the branch pipe. When installing, the water flowing out from the branch pipe is received by the front inner peripheral surface of the water shield cover surrounding the front and rear outer peripheral surfaces of the water stop plug with a required gap, and the rear end is passed through the hollow hole inside the water stop plug. After the drainage hole facing the radial direction of the part flows out and is received by the rear inner peripheral surface of the water shield cover, after the screwing of the tip of the water stop plug is completed, the water stop cap is attached to the rear end of the water stop plug A water-stopping method for a branch pipe, wherein the drainage hole is sealed, and finally the water-proof cover is removed from the water-stop plug.   The distal end portion of the branch pipe has a male screw portion that can be screwed into a female screw formed on the inner peripheral surface of the branch end portion, and a hollow hole that opens to the front end surface of the male screw portion, and a rear end portion that communicates with the hollow hole. A water stop plug having a water drainage hole that opens in the outer peripheral surface of the water stop in the radial direction, and a water that is detachably mounted in a substantially middle portion of the outer peripheral surface of the water stop plug with the outer periphery surrounded by a predetermined gap. A water stop device for a branch pipe, comprising: a protection cover and a water stop cap attached to a rear end portion of the water stop plug so as to seal the drain hole.   The water stop device for a branch pipe according to claim 2, wherein a guide portion slightly smaller in diameter than the outer diameter of the male screw portion is provided at the tip of the male screw portion in the water stop plug.   A water stop plug is provided by providing a large-diameter portion in the middle of the outer peripheral surface of the water stop plug and screwing a female screw hole formed in the partition wall on the inner peripheral surface of the water shield cover to the male screw formed on the outer peripheral surface. The water stop device for a branch pipe according to claim 2 or 3, wherein a water shielding cover is detachably attached to the outer peripheral surface of the branch pipe.   A water screw cap is attached to the rear end of the water stop plug by forming a male screw on the outer peripheral surface of the rear end of the water stop plug and screwing the female screw on the inner peripheral surface of the water stop cap into the male screw. Item 5. A water stop device for a branch pipe according to any one of Items 2 to 4.   The water stop device for a branch pipe according to claim 4 or 5, wherein a packing is provided between a front end surface of the water stop cap and a side end surface of a large diameter portion of the water stop plug with which the water stop cap abuts.   The water stop device for a branch pipe according to any one of claims 2 to 6, wherein a polygonal head that can be rotated by inserting a rotary tool is provided at a rear end portion of the water stop plug and the water stop cap.

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