JP2501682B2 - Valve with hot tap fitting - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve which is inserted into a pipe by a hot tap method.

[0002]

2. Description of the Related Art The easiest way to insert a valve into an existing piping line is to stop the flow of the piping line and insert the valve, but it is troublesome to contact the customer and investigate the usage situation. Therefore, recently, the pressure inside the pipe has not dropped,
Moreover, a hot tap construction method in which a valve is inserted into a piping line without stopping the flow of fluid is performed, and an example thereof is a construction method described in Japanese Patent Publication No. 48-27244.

The outline of the hot tap method will be described with reference to FIGS. 6 to 22. In this hot tap method, as shown in FIG. 6, the ground on both sides of the valve insertion location 6 of the pipe 5 is excavated, and fittings 1.1 are mounted on the upstream side and the downstream side of the valve insertion location 6 of the pipe 5. However, this fitting 1 is, as shown in FIG. 7, an upper fitting 2
And a lower fitting 3, and a neck fitting 17 is attached to the upper fitting 2 by welding 23.

The neck fitting 17 is provided with a flange 2a, the flange 2a is provided with screw holes 22 at several places, and an internal thread 18 is provided on the inner edge.
The female screw 18 is formed so as to be screwed with the male screw 19 of the seal plug 4.

As shown in FIG. 8, the upper fitting 2 and the lower fitting 3 are welded to the outer periphery of the pipe 5 by fillet welding 20, and the upper fitting 2 and lower fitting 3 are bonded by butt welding 21. .

Next, as shown in FIG. 9, the gate valve 7 and the punching machine 8 are sequentially mounted on the flange 2a, the gate valve 7 is opened, and the diameter of the pipe 5 is made larger than that of the pipe 5 by a drive source (not shown). The tube 5 is cut by rotating the formed cylindrical cutter 9. And the cut part of the pipe 5 is the cutter 9
It is held by the holding tool 9a inside, and is pulled up together with the cutter 9 and accommodated in the punching machine 8.

Next, the gate valve 7 is closed, the punching machine 8 is removed from the gate valve 7, and as shown in FIG. 10, the stopping valve 10 equipped with the stopper 11 is attached to the gate valve 7 and sealed, and again. The gate valve 7 is opened, and the stopper 11 is inserted into the cut portion of the tube 5. Then, the stopper 11 to be inserted directs the slit 12 toward the side where the fluid is flowing, as shown in FIG.

The above cutting and insertion of the stopper 11 are carried out for each fitting 1, and as shown in FIG. 11, the bypass outlets 15 and 15 provided in both stopping machines 10 and 10 are connected. Bypass circuit 1
6 is provided.

As shown in FIG. 12, the stopper 11 is composed of a cylinder 13 having a rubber 12 on the outer surface and having a slit 12, and the outer diameter of the rubber 14 is smaller than the outer diameter of the cutter 9. In this state, the tube 5 is inserted into the cut portion, and then the stopping machine 10 is operated to expand the stopper 11 in the radial direction by a mechanism (not shown) to bring the rubber 14 of the stopper 11 into close contact with the cut portion.

The specific structure of the stopper 11 is described in Japanese Patent Publication No. 48-27244. Then, the fluid becomes slit 1 of the stopper 11 on the upstream side.
2 enters the stopper 11, passes through the upstream stopping machine 10, enters the downstream stopping machine 10 through the bypass circuit 16, passes through the slit 12 of the downstream stopper 11, and reaches the downstream pipe 5. And the valve insertion position 6 of the pipe 5 between the fittings 1 and 1.
Flow stops.

Therefore, the valve insertion location 6 of the pipe 5 is cut, and the valve 35 is inserted into the pipe 5 as shown in FIG. When the insertion of the valve 35 into the tube 5 is completed, the work reverse to the previous step is performed. That is, the stopping machine 10
Is operated to reduce the stopper 11, and the stopper 1
1 is collected in the stopping machine 10, the gate valve 7 is closed, and the bypass circuit 16 and the upstream and downstream stopping machines 10 and 10 are removed.

Next, the plug tightening machine 38 shown in FIG.
The plug fastener 38 is mounted on the gate valve 7. A shaft 39 is rotatably provided on the plug valve 38, and a male screw 40 is provided on the tip of the shaft 39.
The upper part of the shaft 39 where the male screw 40 is provided is formed to have a small diameter as shown in FIG. 18 (a), and a large-diameter stopper 42 is provided to the upper part of the part where the small diameter is formed. Further, smooth surfaces 45 are formed on both sides of the shaft 39 from the small diameter portion to the lower end.

Then, as shown in FIG. 18 (b), the screw tightening fork 37 fitted to the shaft 39 is provided with a female screw 44 into which a male screw 40 of the shaft 39 can be screwed, at the central portion thereof. The screw tightening fork 37 fitted on the shaft 39 is
The screwing fork 37 is formed so as not to drop from the shaft 39 unless the female screw 44 is rotated and the female screw 44 is unscrewed from the male screw 40. Further, a screw hole 49 penetrating therethrough is provided in the side portion of the screw tightening fork 37, and a machine screw 46 is screwed into the screw hole 49.
Is transmitted to the screw tightening fork 37.

The lower surface of the screw tightening fork 37 is shown in FIG.
As shown in FIG. 19, a pair of fastening claws 47 are provided, and the fastening claws 47, as shown in FIG. 19, when the screw tightening fork 37 is rotated in a direction in which the seal plug 4 described later is screwed in. When the screw tightening fork 37 is reversed, the rear end side of the fastening claw 47 can be pulled out from the recess 48 as shown in FIG. Further, the rear end side is formed so as to project short, and the lower surface of the fastening claw 47 is an inclined surface 50.

As shown in FIGS. 15 and 16, the seal plug 4 for sealing the upper portion of the fitting 1 has two recesses 48 on the upper surface thereof, and the lower side of the flange-like portion provided on the peripheral edge of the upper end. Is fitted with an O-ring 25, and a male screw 19 is provided below the O-ring 25.

Then, as shown in FIG. 18 (b), the screwing fork 37 is externally fitted to the portion of the shaft 39 having a small diameter at the upper portion of the portion where the male screw 40 is provided.
9 and the screw tightening fork 37 do not rotate relative to each other,
The small screw 46 is screwed in so that the tip end thereof is in slight contact with the smooth surface 45.
A spring 43 is inserted between the shaft 7 and the stopper 42 of the shaft 39 as shown in FIG. 15 to urge the screw tightening fork 37 downward.

Then, as shown in FIG. 15, the male screw 40 of the shaft 39 is screwed into the female screw 41 of the seal plug 4, the fastening claw 47 of the screw tightening fork 37 and the recess 48 of the seal plug 4 are engaged.
And the seal plug 4 is mounted on the shaft 39 of the plug tightening machine 38.

As described above, the plug fastening machine 38 with the seal plug 4 attached thereto is attached to the gate valve 7 as described above, and then the gate valve 7 is opened to open the plug fastening machine 38. When the shaft 39 is moved forward and the shaft 39 is rotated clockwise, the tip end side of the fastening claw 47 of the screw tightening fork 37 engages with the recess 48 of the seal plug 4, as shown in FIG.
The seal stopper 4 is rotated, and as shown in FIG. 20, the male screw 19 of the seal stopper 4 is screwed into the female screw 18 of the fitting 1 so that the seal stopper 4 is attached to the fitting 1 and the upper opening of the fitting 1 is closed. Seal tightly.

Next, when the shaft 39 is rotated in the opposite direction, as shown in FIG. 21, the fastening claw 47 is pulled out of the recess 48 of the seal plug 4 by the inclined surface 50 of the lower surface, and the male screw 40 of the shaft 39 is also sealed. Since the screw 39 is unscrewed from the female screw 41 of the plug 4, the shaft 39 of the plug fastening machine 38 is disengaged from the seal plug 4 while the screw fastening fork 37 is attached.

Then, as shown in FIG. 22, the plug fastener 38 and the gate valve 7 are removed from the fitting 1, and the mounting of the valve 35 without stopping the flow of the fluid in the pipe 5 is completed. Furthermore, a concrete pit 36 is provided around the valve 35, and the upper surface of the portion where the fitting 1 is provided is formed flush with another road surface or the like, thus completing the construction. Then, the road surface has no protrusions and can be used as a road.

[0021]

In the conventional construction method, the pipe 5 buried in the city center can be constructed only at night due to road traffic. Therefore, the construction is carried out over a long period of time. However, it is not preferable from the viewpoint of keeping the calmness of the surrounding residents. Therefore, a construction period as short as possible was required.

During the operation of inserting the valve, the inside of the pipe 5 is sealed by the stoppers 11 on both sides of the valve, and the fluid is allowed to flow in the bypass circuit 16. However, the fluid has a reduced cross-sectional area in the slit 12 of the stopper 11 and is squeezed to generate pressure loss, and the bypass circuit 16 has a smaller cross-sectional area than the pipe 5.

Therefore, although the supply flow rate is reduced, this flow rate reduction time continues throughout the welding of the valve to the pipe, thus limiting the construction time. For example, when the fluid is city gas, the problem is that work is performed while being constrained by the construction time and time, such as selecting the time when the consumption of city gas is low and performing it at night or performing it in summer rather than winter. was there.

The present invention has been made in view of the above matters, and a valve using a hot tap fitting that can be inserted into a pipeline without being limited in construction time and construction time is provided. This is a technical issue.

[0025]

According to the present invention, a fitting 1 is attached to the outer periphery of a pipe 5, a cut portion 55 is formed in the pipe 5 in the fitting 1 and a pipe end portion 56 is provided, and an opening of the fitting 1 is provided. A sealing plug 83 having a pair of recesses 48 on its upper surface is screw-fitted into the shaft, and a hollow shaft 60 is rotatably tightly fitted in a shaft insertion hole 84 provided in the sealing plug 83. A hollow tube 63 extending in the lateral direction is connected to the lower portion of the shaft 60, and the holder 7 is attached to the tip of the hollow tube 63.
0 is connected to the hollow shaft 60, and a balloon 76 that is in close contact with the inner peripheral surface of the tube end portion 56 when inflated is provided by the holding body 70 in communication with the hollow shaft 60. A valve using a hot tap fitting was provided by hanging a central shaft 65 that abuts.

[0026]

The valve using the hot tap fitting of the present invention is attached to the pipe 5 as described below.

That is, in the same manner as in the conventional example, the pipe 5 is
A conventionally known fitting 1 as shown in FIGS. 7 and 8 is attached, and on the flange 2a of the fitting 1,
A conventionally known gate valve 7 as shown in FIG. 9 is attached,
A conventionally known punching machine 8 is attached to the gate valve 7, the gate valve 7 is opened, and a cut portion 55 is formed in the pipe 5 with a cylindrical cutter 9 to provide a pipe end portion 56.

Next, the portion cut with the cutter 9 is pulled up into the punching machine 8, the gate valve 7 is closed, and the punching machine 8 is removed from the gate valve 7. Next, as shown in FIG.
The shaft 39 of the conventionally known plug fastening machine 38 is attached to the sealing plug 8
The hollow shaft 60 tightly fitted in the shaft insertion hole 84 of 3 is screwed to form the shaft 3
The fastening claw 47 of the screw-fastening fork 37 fitted on the outer periphery of the screw 9 is engaged with the recess 48 of the sealing plug 83.

Then, the plug fastening machine 38 is attached to the gate valve 7, the gate valve 7 is opened, and the shaft 3
9 is lowered and rotated, the sealing plug 83 is screwed into the opening of the fitting 1, and the central shaft 65 is brought into contact with the bottom portion of the fitting 1.

Next, the shaft 39 is reversely rotated to remove the shaft 39 from the hollow shaft 60, and the plug tightener 38 and the gate valve 7 are removed.
To complete the valve assembly as shown in FIG. Then, when the fluid is flowing through the pipe 5, the trumpet-shaped holding body 70 is rotated and placed at a lateral position that does not face the pipe end portion 56, as shown in FIG.

In order to stop the flow of the pipe 5, the hollow shaft 60 is rotated, the holder 70 is placed at a position facing the pipe end portion 56, and the cylinder 90 or the like is attached to the hollow shaft 60 as shown in FIG. Connect the air supply source to supply air.

Then, as shown in FIG. 5, the balloon 76
Expands and enters the tube end portion 56, and the outer peripheral surface of the balloon 76 comes into close contact with the inner peripheral surface inside the tube end portion 56 to close the tube 5. To open the tube 5, the gas inside the balloon 76 is exhausted, and the balloon 76 contracts. Therefore, the hollow shaft 60 is rotated,
Place the holder 70 in the position of FIG.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A valve using a hot tap fitting according to an embodiment of the present invention will be described below with reference to FIGS. Parts will be omitted, or description will be made with reference to the drawings of the conventional example.

In the valve using the hot tap fitting of this embodiment, the fitting 1 is attached to an existing pipe 5 as shown in FIG. 1, and a cut portion 55 is formed in the pipe 5 in the fitting 1 to form a valve. It is designed to be attached.

In the fitting 1, the upper fitting 2 and the lower fitting 3 shown in FIG. 7 are attached to the outer periphery of the pipe 5 by welding by fillet welding 20 or the like as shown in FIG. As shown in FIG. 1, the opening of the neck fitting 17 of the fitting 1 is provided with a female screw 18, and the flange 2a is provided with
A screw hole 22 is provided.

The pipe 5 in the fitting 1 is provided with a cut end 55 and a pipe end 56. Then, in order to form the cutting portion 55, as shown in FIG. 9, on the flange 2a of the fitting 1,
A conventionally known gate valve 7 is attached, and a conventionally known punching machine 8 is attached to the gate valve 7.

Then, the gate valve 7 is opened, the cylindrical cutter 9 having a diameter larger than that of the pipe 5 is lowered and rotated, the pipe 5 is cut, and the pipe end portion 56 facing the pipe 5 is provided. The cut portion of the pipe 5 is pulled up together with the cutter 9, the gate valve 7 is closed, the punching machine 8 is removed from the gate valve 7, and the formation of the cut portion 55 of the pipe 5 is completed.

The valve using the hot tap fitting of this embodiment is a sealing plug 8 shown in FIG.
This sealing plug 83 is provided with a male screw 19 that is screwed into the female screw 18 of the fitting 1, and the O-ring 2 is provided on the lower side of the flange formed on the upper portion.
5 is externally fitted.

Further, the sealing plug 83 is provided with a pair of recesses 48 on the upper surface thereof, and the shaft insertion hole 84 is formed at the center thereof.
Is provided, and a small O-ring 85 is fitted in the insertion hole 84.

Then, the shaft insertion hole 8 of the sealing plug 83
4, a hollow shaft 60 is rotatably and tightly fitted, a hollow shaft screw 61 is provided inside the upper end of the hollow shaft 60, and a hollow shaft screw 61 is provided near the upper part of the hollow shaft 60 due to internal pressure. Axis 60
A stop piece 62 is fixed to prevent the movement of the.

On both sides of the lower portion of the hollow shaft 60, as shown in FIGS. 1 and 2, a pair of hollow tubes 6 extending in the lateral direction.
3 are connected in a T shape. A trumpet-shaped holder 70 is connected to the tip of the hollow tube 63, and a balloon 76 is provided inside the trumpet-shaped holder 70. And
The connection between the hollow tube 63 and the trumpet-shaped holder 70 is as shown in FIG.
As shown in, the hollow pipe flange 64 provided on the hollow pipe 63.
And a holder flange 71 provided on the trumpet-shaped holder 70.
Then, a balloon flange 77 provided on the balloon 76 is sandwiched between and fixed by bolts.

The balloon 76 is made of rubber and has a trumpet-shaped base. The balloon 76 is adhered to the inner surface of the trumpet-shaped holder 70 with an adhesive 78. The outer peripheral surface of the balloon 76 is formed in close contact with the inner peripheral surface of the tube end portion 56.

A sealing plug 83 fitted with the balloon 76.
In order to attach the shaft 1 to the fitting 1, the hollow shaft 60 tightly fitted in the shaft insertion hole 84 of the sealing plug 83 is attached to the shaft 39 of the conventionally known plug fastening machine 38 shown in FIG.
Screw tightening fork 37 that is screwed by
The fastening claw 47 is engaged with the recess 48 of the sealing plug 83.

Then, the small screw 4 of the screw tightening fork 37
6 is lightly brought into contact with the smooth surface 45 of the shaft 39 so that the screwing fork 37 cannot move vertically with respect to the shaft 39 and is urged downward by the spring 43. And put it on.

Next, the plug tightening machine 38 is attached to the gate valve 7, and as shown in FIG.
Open, lower the shaft 39 and rotate it,
Is fitted into the opening of the fitting 1 and the central shaft 65
The tip end of the hollow shaft 60 is pierced into contact with the inner surface of the bottom of the fitting 1 and brought into contact therewith, and the hollow shaft 60 is attached so as to prevent lateral shake.

Next, the shaft 39 is rotated in the reverse direction so that the shaft 39 is unscrewed from the hollow shaft 60, the plug tightener 38 and the gate valve 7 are removed, and the valve assembly is completed (FIG. 4). Then, in order to open the tube 5, in order to house the balloon 76 in the trumpet-shaped holding body 70, the balloon 76 is formed so that it can be folded without a pressure difference between the inside and the outside.

Then, when the gas inside the balloon 76 is discharged, the balloon 76 is folded by itself. Further, since there is usually a fluid pressure in the pipe 5, the synergistic action of the fluid causes the balloon 76 to move.
Is quickly folded into the trumpet-shaped holder 70.

It is also possible to fold the balloon 76 into the trumpet-shaped holding body 70 by applying a negative pressure,
This is done by closing the original valve 91 shown in FIG. 5, opening the injection valve 92 and the exhaust valve 93 to exhaust the air inside the balloon 76, and then opening the original valve 91 to direct the gas inside the cylinder 90 to the exhaust valve 93. The balloon 76 is made negative by the ejector effect.

Further, it may be connected to a vacuum pump (not shown). When the pressure in the pipe 5 is low, the number of balloons 76 that closes the pipe end 56 may be one.

[0050]

The valve using the hot tap fitting of the present invention is provided with a balloon 76 capable of closing the pipe end 56 in the fitting 1 and fully opening the pipe end 56.

Therefore, a valve capable of opening and closing the pipe 5 can be directly inserted into the pipe 5 by the hot tap method without providing the pipe 5 with a bypass circuit or the like. Therefore, the amount of work for inserting the valve into the pipe 5 is reduced, and the work period can be shortened.

Further, since a device such as a bypass circuit that greatly restricts the flow rate is not used, the flow rate does not drop during the construction, and the construction can be performed at a time when the consumption of the fluid flowing through the pipe 5 is large. It became a valve that can be inserted into the pipe 5 without restriction on the construction time.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 3 is a diagram showing an assembled state of an embodiment of the present invention.

FIG. 4 is a cross-sectional view of an embodiment of the present invention showing a state in which a pipeline is in circulation.

FIG. 5 is a cross-sectional view of an embodiment of the present invention showing a state in which a pipeline is closed.

FIG. 6 is a view showing a state where fittings of a conventional example are attached at two places.

FIG. 7 is an exploded perspective view of a conventional fitting.

FIG. 8 is a view showing a state in which a fitting of a conventional example is attached to a pipe.

FIG. 9 is a view showing a state in which a conventional pipe is about to be cut.

FIG. 10 is a view showing a mounting state of a stopper of a conventional example.

FIG. 11 is a diagram showing a state in which a bypass circuit is provided in a conventional tube.

FIG. 12 is a perspective view of a main part of a conventional stopper.

FIG. 13 is a view showing a state in which a stopper is attached to a conventional pipe.

FIG. 14 is a view showing a state where a valve is inserted in a pipe of a conventional example.

FIG. 15 is a view showing a conventional plug tightener and a seal stopper.

FIG. 16 is a perspective view of a conventional seal plug.

FIG. 17 is a perspective view showing a back surface and a front surface of a conventional screw tightening fork.

FIG. 18 is a diagram showing a main part of a shaft of a conventional plug fastening machine and a main part of the shaft and a screw fastening fork.

FIG. 19 is a view showing an engaged state of a conventional screw tightening fork.

FIG. 20 is a view showing a main part of a fitting of a conventional example closed with a seal plug.

FIG. 21 is a view showing a detached state of a conventional screw tightening fork.

FIG. 22 is a view showing a state in which the valve has been completely inserted into the conventional pipe.

[Explanation of symbols]

 1 Fitting 5 Pipe 48 Recessed portion 55 Cut portion 56 Pipe end portion 60 Hollow shaft 63 Hollow pipe 70 Holding body 76 Balloon 83 Sealing plug 84 Shaft insertion hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomiyuki Kito 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Yoji Takanashi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Tube Co., Ltd. (72) Inventor Kazutaka Akao 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd.

Claims (1)

(57) [Claims] 1. A pipe on the outer periphery of the fifth-fitting 1 is mounted, and the cutting portion 55 is formed the tube end 56 is provided in the tube 5 of the fitting 1, the opening of the fitting 1, shea Lumpur for plug 83 is screwed, and this sealing plug 83
The hollow shaft 60 is rotatably and tightly fitted in a shaft insertion hole 84 provided in the hollow shaft 60, and a hollow pipe 63 extending in a lateral direction is connected to a lower portion of the hollow shaft 60. A holding body 70 is connected to the hollow shaft 60, and the holding body 70 holds a balloon 76 that comes into close contact with the inner peripheral surface of the tube end portion 56 when expanded.
The hollow tube 63 is provided with a fitting 1
A valve that uses a hot tap fitting provided by hanging a central shaft 65 that abuts on the bottom of the.