JP4450487B2 - Branch pipe installation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a partial branch pipes attached method and, more particularly, to a partial branch pipes attached method for installing branch pipes can be attached and fire hydrants or the like existing water pipe.
[0002]
[Prior art]
When installing a branch pipe from the middle of an existing underground pipe such as a water pipe, or installing a fire hydrant, an air valve, etc. Is implemented. When installing a fire hydrant, etc. by this continuous water construction method, attach a split T-shaped pipe to the existing pipe, and drill by connecting a valve to the opening of the T-shaped pipe and a drilling machine. In the closed state, a fire hydrant is connected instead of the drilling machine, and the valve is opened. When a fire hydrant is attached, the drilling position for the existing pipe is directly above the existing pipe, and therefore, the fire hydrant is attached immediately above the existing pipe. And while covering the periphery outside a fixed range from the position of a fire hydrant, it is set as the structure opened so that a hose etc. can be connected from the ground surface only in the part directly above a fire hydrant.
[0003]
By the way, recently, for the purpose of shortening the construction period and reducing the number of man-hours, among the existing pipes, relatively small-diameter water pipes (for example, nominal diameter 75 to 300 mm) are buried in shallow layers ( For example, a change from 1200 mm to 600 mm covering from the upper part of the pipe until now, but the upper end of the fire hydrant, air valve, etc. should be at least 150 mm away from the ground surface.) The technical problem at has already been solved.
[0004]
[Problems to be solved by the invention]
However, if a fire hydrant is attached by a conventional construction method, the height of the fire hydrant is 400 mm or more even if the earth covering of the existing pipe is 600 mm below the surface, and furthermore, an on-off valve necessary for the continuous water construction method is attached. Then, the upper end of the fire hydrant cannot be separated from the ground surface by 150 mm or more. Furthermore, even if the fire hydrant and the on-off valve are improved, it is difficult to reliably separate the upper end of the fire hydrant from the ground surface by 150 mm or more with respect to any nominal diameter pipe.
[0005]
Therefore, in view of the above-mentioned problems of the prior art, the object of the present invention is to attach a fire hydrant etc. to an existing pipe buried in a shallow layer with a soil covering of 600 mm below the surface of the ground. and to provide a partial branch pipes attached method you facilitate be spaced more.
[0006]
[Means for Solving the Problems]
The above object can be achieved by the inventions described in the claims. The characteristic configuration of the branch pipe mounting piping member used in the present invention has a split shape and a substantially T shape that can hold an existing pipe in a watertight manner, and a fire hydrant is placed in the middle of the foot portion of the substantially T shape. An opening that can be attached is formed, and an opening that can attach a drilling machine for drilling the existing pipe to the end of the foot portion in a watertight manner is formed.
[0007]
According to this configuration, when a fire hydrant is attached to an opening to which a fire hydrant can be attached, it is not attached directly above the existing pipe as in the prior art, but by holding the existing pipe, the side of the existing pipe Since it attaches to a position, the position of the upper end of a fire hydrant can be held down low and it becomes easy to ensure the earth covering depth to 150 mm or more.
[0008]
It is preferable that a rectifier for guiding a water flow toward the fire hydrant is attached to the opening to which the drilling machine can be attached in a watertight manner.
[0009]
According to this configuration, when the water flow is vigorously released from the attached fire hydrant, the occurrence of turbulent flow can be reduced as much as possible, and the water flow can be guided so as to be discharged with high strength.
[0010]
Furthermore, the characteristic structure of the branch pipe mounting method according to the present invention has a split shape and a substantially T-shape capable of holding an existing pipe in a watertight manner, and a fire hydrant is placed in the middle of the substantially T-shaped foot portion. A branch pipe mounting pipe member having an opening that can be attached in a watertight manner with a drilling machine that drills the existing pipe at the end of the foot portion is formed with respect to the existing pipe. It is holding the water-tight Te, the the opening of the middle foot portion of the branch pipe mounting pipe member, attached to launch a fire hydrant from a side position of the existing pipe, the branch pipe mounting having a substantially T-shaped A work valve and a drilling machine are attached to the opening at the end of the foot portion of the piping member so as to be watertight, and after opening the work valve, the drilling machine is inserted and driven, whereby the existing pipe Cut a part and open it, then remove the cut piece, In removing the drilling machine by closing the Goben.
[0011]
According to this configuration, when attaching the fire hydrant, it is attached to the side position of the existing pipe by holding the existing pipe, so that the position of the upper end of the fire hydrant can be kept low, and the earth covering is 600 mm below the surface. Even if a fire hydrant or the like is attached to an existing pipe buried in a shallow layer, a branch pipe attachment method that facilitates separating the upper end of the fire hydrant from the ground surface by 150 mm or more can be provided.
[0012]
It is preferable to add an anticorrosion function to the opening obtained by cutting a part of the existing pipe.
[0013]
According to this configuration, it is convenient to enhance the durability of this portion by preventing the cut and fresh surface having a high activity from being corroded. As a method of adding an anti-corrosion mechanism, a method such as inserting a metal bush having high corrosion resistance such as copper or copper alloy into a cutting point using a jig such as a bushing tool and covering the cutting point with the metal bush, etc. Can be adopted. However, when the existing pipe is a resin pipe, it is not necessary to add a corrosion prevention function.
[0014]
It is preferable to attach a rectifier that guides the water flow from the existing pipe in a certain direction, instead of the working valve, to the opening where the drilling machine can be attached in a watertight manner.
[0015]
According to this configuration, when a fire hydrant is attached, it is convenient that the generation of turbulent flow in the water flow discharged from the fire hydrant is minimized and the water flow can be guided to be released with high strength.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a pipe member having a substantially T shape so as to have an opening on the side of an existing pipe A (disposed in a direction perpendicular to the paper surface of FIG. 1) embedded in the soil. 1 shows a state in which the working valve 2 and the punching machine 3 are attached to the opening side, and the cutter 5 attached to the tip of the drilling machine 3 is brought close to the existing pipe A by operating the handle 4. .
[0017]
The T-shaped piping member 1 is divided into two parts, and holds the existing pipe A and is fitted to the existing pipe A by using fasteners such as bolts 6 and nuts 7. In order to prevent water leakage as the existing pipe A is perforated, the packing 8 is inserted into the opening portion of the split structure, and is configured to be watertight (perpendicular to the plane of the paper, which is the direction in which the existing pipe is disposed). For the other direction, although not shown in the drawing, a packing that is in contact with the circumferential direction of the existing pipe is disposed inside the T-shaped piping member 1). The T-shaped piping member 1 is not limited to two, but may be divided into three or any other number. In short, it is only necessary to hold the existing pipe in a watertight manner.
[0018]
Furthermore, a fire hydrant 9 is configured to be connected upward via flanges 10 and 11 in the middle of the portion corresponding to the T-shaped leg of the T-shaped piping member 1. Consideration is given to lower the position relative to the existing pipe A. That is, in the conventional technique, the upper part of the existing pipe A is perforated, and the fire hydrant is attached to this position. Therefore, the installation position of the fire hydrant has to be bulky. In the T-shaped piping member 1, the whole can be maintained in a low posture because it is raised from the side position of the existing pipe A.
[0019]
The punching machine 3 is connected to the end of the foot portion of the T-shaped piping member 1 by a bolt 14 and a nut 15 via a working valve 2 and flanges 12 and 13, and the cutter 5 is manually operated by the handle 4. Is made to approach the existing pipe A, and the drilling by the cutter 5 is operated manually, by a gasoline engine drive system, an electric motor or the like. When the perforation by the cutter 5 is completed, the cut piece of the existing pipe cut is received inside the cylindrical cutter 5, the handle 4 is rotated in the reverse direction and the cutter 5 is pulled back. The cut piece of the pipe is also transported to the outside of the T-shaped piping member 1. Reference numeral 21 denotes a manual lever for opening and closing a spherical valve (not shown) built in the fire hydrant.
[0020]
When the drilling is completed, the working valve 2 is closed and the drilling machine 3 is removed. Then, as shown in FIG. 2, a copper bush 16 used as an example of a method for adding an anticorrosion function to the opening is inserted through the inner peripheral surface of the working valve 2 to prevent the cut surface of the existing pipe A from being corroded. Attached and covered on the cut surface. The mounting method of the copper bush 16 is performed by, for example, attaching a bushing tool (not shown), which is a bush insertion machine with the copper bush 16 attached to the tip, to the flange 12 in the same manner as the above-described drilling machine 3 is used. Can do.
[0021]
That is, after opening the work valve 2, a cylindrical copper bush 16 attached to one end of the bushing tool and holding a polyurethane foam resin inside is rotated, and a handle provided on the other end side of the bushing tool is rotated. By doing so, it is fed into the T-shaped piping member 1. When the copper bush 16 is inserted into the perforated opening, the projecting portion provided on the rear end side of the copper bush 16 comes into contact with the perforated opening and the progress stops. And by rotating the shaft inserted through the center position of the polyurethane foam resin, pulling the disk covering the front end surface of the polyurethane foam resin to the near side, compressing the polyurethane foam resin and projecting it in the radial direction, The edge of the copper bush is plastically deformed by the overhanging pressure to cover the outer edge of the perforated opening. After that, the shaft inserted through the center of the polyurethane foam resin is reversely rotated to return the deformation of the polyurethane foam resin to its original state, and then the handle is reversely rotated so that only the copper bushing is opened. The bushing tool is pulled back together with the polyurethane resin, and the working valve 2 is closed to remove the bushing tool.
[0022]
By doing in this way, since the fire hydrant 9 will be installed in the side position not directly above the existing pipe A, the upper end position of the fire hydrant 9 can be kept low, and the soil covering depth is 150 mm. It is easy and certain to ensure the above.
[0023]
Furthermore, it is preferable to replace the bushing tool with a rectifier attachment jig 17 attached to the flange 12 as shown in FIG. Then, as shown in FIG. 4, the working valve 2 is opened, and the rectifier mounting jig 17 is placed inside the T-shaped piping member 1 in the same manner as when the drilling machine 3 or the bushing tool is inserted. The handle 19 provided in the is rotated and fed. When it reaches the position immediately below the fire hydrant 9 already attached, the progress is stopped and the rectifier 18 is disposed, and the handle 19 is further rotated to restore only the shaft.
[0024]
That is, the connection structure between the handle 19 and the rectifier 18 in the rectifier mounting jig 17 is as shown in the partially enlarged view (round circle) in FIG. 3. The right end portion of the handle shaft 19a and the rectifier 18 is a female screw portion 19b. And the inner periphery of the rectifier mounting jig 17 is screwed to the outer periphery of the rectifier 18 by the male screw portion 18a. As a result, the rotation of the handle 19 in the clockwise direction causes the rectifier 18 to advance inside the rectifier mounting jig 17 and eventually stop at the position shown in FIG. When the handle 19 is further rotated from the stopped stage, the screwing at the female screw portion 19b is released, and only the handle shaft 19a moves backward in the rectifier mounting jig 17 and is returned to the front side. Reference numerals 22 and 23 are O-rings for ensuring watertightness.
[0025]
Finally, the rectifier attachment jig 17 and the work valve 2 are removed (FIG. 5). When the rectifier 18 is arranged as shown in FIG. 5, when the water flow is vigorously discharged from the fire hydrant 9, it is possible to guide the water flow to be smooth and to reduce the occurrence of turbulent flow as much as possible.
[0026]
When it becomes necessary to provide a branch pipe in the main pipe, the rectifier described above can be removed and the branch pipe can be easily connected from this location. In that case, after the work valve 2 is attached, the reverse procedure is followed when the rectifier is attached, the rectifier is removed, and a branch pipe is connected to the rectifier, and the work valve 2 is opened to allow water to flow.
[0027]
[Another embodiment]
(1) The branch pipe mounting method using the branch pipe mounting pipe member of the above embodiment can be applied to a metal pipe made of ductile cast iron or steel, a resin pipe made of vinyl chloride, polyethylene or the like.
[0028]
(2) About the branch pipe mounting method using the branch pipe mounting pipe member of the above embodiment, an example of performing on the existing pipe has been shown, but this existing pipe is not limited to those provided for a long time, Even when a new pipe is laid, it can also be applied to places where it is difficult to lay a fire hydrant, an air valve, etc., such as another pipe is provided near the top of the pipe after laying.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view illustrating a state in which a piping member according to the present invention is attached to an existing pipe and drilled; FIG. 2 is a cross-sectional view illustrating a state in which an anticorrosion bush is attached after the completion of drilling shown in FIG. 1 is a cross-sectional view showing a state where a plug with a rectifying function is attached to the piping member of FIG. 1. FIG. 4 is a cross-sectional view showing a state where a rectifier is attached to the piping member shown in FIG. Sectional view showing the completed installation of the rectifier in the member 【Explanation of symbols】
2 Work valve 3 Drilling machine 9 Fire hydrant 17 Rectifier mounting jig 18 Rectifier A Existing pipe

Claims (3)

The leg portion has a split and substantially T-shape that can hold an existing pipe in a watertight manner, and an opening to which a fire hydrant can be attached is formed in the middle of the substantially T-shaped foot portion. the branch pipe mounting pipe member to end the opening can be attached a drilling machine watertight perforating the existing pipe is formed by holding with respect to existing pipes in water-tight,
At the opening in the middle of the foot part of the branch pipe mounting piping member, a fire hydrant is attached so as to rise from a side position of the existing pipe,
A work valve and a drilling machine are attached to the opening of the foot portion end of the branch pipe mounting pipe member having a substantially T shape so as to be watertight, the work valve is opened, and then the drilling machine is inserted. A branch pipe mounting method in which a part of the existing pipe is cut and opened, the cut piece is removed, the working valve is closed, and the drilling machine is removed. The branch pipe mounting method according to claim 1 , wherein an anticorrosion function is added to an opening obtained by cutting a part of the existing pipe. The branch pipe attachment method according to claim 1 or 2, wherein a rectifier for guiding a water flow from an existing pipe toward the fire hydrant is attached to the opening to which the drilling machine can be attached in a watertight manner, instead of the work valve.

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