JPH03292492A - Method of inserting valve into pipeline and valve therewith - Google Patents

Abstract

PURPOSE:To insert a valve into a pipeline without stopping a flow by installing a gate valve in the fitting of a main pipe, cutting this main pipe, attaching a plug clamper to this gate valve, opening it, and removing the gate valve and the plug clamper from each element, while inserting a stopper into a drill hole of the main pipe, and closing this main pipe. CONSTITUTION:An adapter 111 is attached to a fitting 1 of a main pipe 5 and a gate valve 7 in addition. The main pipe 5 is cut by a cutter 201 of a drill 2000 of the gate valve 7. This drill 200 is removed, and a plug clamper 38 with a plug 105 fitted with a stopper 101 is attached to the gate valve 7. This stopper 101 is held in the adapter 111, and the plug clamper 38 is removed from the adapter 111. The stopper 101 is inserted into a drill part of the main pipe 5 by an extension shaft, having it expanded wide, closing the main pipe 5. In consequence, since an excavating area of a road surface or the like and a working part of the main pipe are few, a construction period is sharply reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to 1) a method of inserting a valve into a pipeline by a hot tap method, and a valve used in the method.

[Conventional technology]

To insert a valve into an existing piping line, the easiest method is to stop the flow of the piping line and insert the valve. There is a hot tap method in which a valve is inserted into the piping line without reducing the pressure inside the pipe or stopping the flow of fluid, and an example of this is the method described in Japanese Patent Publication No. 48-27244. .

An outline of the hot tap construction method will be explained with reference to FIGS. 8 to 24.

This hot tap method 1. Main pipe 5 as shown in Figure 8.
Cut the ground on both sides of the valve insertion location 6 of the main pipe 5, and install the Twitch Inbutton 1 on the upstream and downstream sides of the valve insertion location 6 of the main pipe 5. 2 and a lower fitting 3, and a neck fitting 17 is attached to the upper fitting 2 by welding 23, and a flange 2a is provided on this neck fitting 17. A screw hole 22 is provided, and a female thread 18 is provided on the inner edge of the seal plug 4.
9 are formed to be screwed together.

Above mentioned upper fitting 2 and lower fitting 3
As shown in FIG. 10, a fillet weld 20 is
At the same time, the upper fitting 2 and the lower fitting 3 are bonded together by butt welding 21.

Next & Mi As shown in Figure 11, attach the gate valve 7 and punch 8 on the flange 2a one after another, open the gate valve 7, and use a drive source (not shown) to form a diameter larger than the main pipe 5. The cylindrical cutter 9 is rotated to cut the main pipe 5. Then, the cut portion of the main pipe 5 is held by a holder 9a within the cutter 9, and is housed together with the cutter 9 in the pulling method drilling machine 8.

Next, close the gate valve 7, remove the punching machine 8 from the gate valve 7, attach the stopping machine 10 equipped with the stopper 11 to the gate valve 7 as shown in Fig. 12, seal it, and close the gate valve 7 again. Open it and insert the stopper 11 into the cut section of the main pipe 5.

The above-mentioned cutting and insertion of the stopper 11 are performed for each fitting 1, and as shown in FIG. will be established.

Then, the stopper 11 is numbered as shown in the figure.
A rubber band is pasted on the outer surface and consists of a cylinder 13 with a slit 12.The rubber band is inserted into the cutting part of the main pipe 5 with an outer diameter smaller than the outer diameter of the cutter 9. Then The stopping machine 1o is operated to expand the stopper 11 in the radial direction by a mechanism not shown, so that the rubber band of the stopper 11 is brought into close contact with the cut portion.

The specific structure of the stopper 11 is as follows.
It is described in Japanese Patent No.-27244.

Furthermore, as shown in FIG. 15, the stopper No. 11 orients the slit 12 in the direction in which the fluid is flowing.

Then, the fluid enters the stopper 11 through the slit 12 of the upstream stopper 11, passes through the upstream stopping machine 10, enters the downstream stopping machine 10 from the bypass circuit 16, and enters the downstream stopper 11. From the slit 12 of 11, it flows into the main pipe 5 on the downstream side.
The flow at the valve insertion location 6 in the main 5 is stopped.

Therefore, the valve insertion location 6 of the main pipe 5 was cut and the 16th
As shown in the figure, the valve 35 is inserted into the main pipe 5.

After the valve 35 has been inserted into the main pipe 5, the previous process is reversed. That is, the stopping machine 10 is operated to reduce the size of the stopper 11.
is collected into the stopping machine 10 and the gate valve 7
Remove the bypass circuit 16 and the upstream and downstream stopping machines 10.

Next, the force required to mount the plug tightening machine 38 shown in FIG. 1. A male thread 40 is provided, and the upper part of the portion of the shaft 39 where the male thread 40 is provided is shown in FIG.
As shown in a), a large-diameter stop 42 is provided at the top of the small-diameter portion, and a small-diameter stop 42 is provided on both sides of the shaft 39. A smooth surface 45 is formed from the bottom end to the bottom end.

Then, as shown in FIG. 20(b), a screw tightening fork 371 fitted to the shaft 39 is rotated at the center of the shaft 3.
A female thread 44 into which a male thread 40 of No. 9 can be screwed is provided.
A wire hole 60 passing through the wire hole 60 is provided on the side thereof, and a machine screw 46 is screwed into this wire hole 60, and the rotation of the shaft 39 is transmitted to the screw tightening fork 37 by this machine screw 46. Ru. Hawk on the underside of the screw tightening fork 37 No. 19
As shown in the figure, a pair of fastening pawls 47 are provided, and when the screw tightening fork 37 is rotated in the direction of screwing in the seal plug 4, which will be described later, the fastening pawl 47 will rotate as shown in Fig. 21. The leading end of the fastening claw 47 protrudes downward for a long time so that it can engage with the recess 48 of the seal plug 4. When the screw tightening fork 37 is reversed, the rear end of the fastening claw 47 moves away from the recess 48 as shown in FIG. The rear end side of the fastening pawl 47 is formed to protrude briefly toward G so that it can be pulled out, and the lower surface of the fastening pawl 47 forms an inclined surface 50.

A seal plug 4 (as shown in FIGS. 17 and 18) seals the upper part of the fitting 1. Two recesses 48 are provided on the upper surface, and a flange-shaped portion provided on the periphery of the upper end has a 0 ring 25 is fitted externally, and male thread 1 is below it.
9 is the setting.

Then, as shown in FIG. 20(b), the screw tightening fork 37 is fitted onto the small diameter portion above the male thread 40 of the shaft 39, so that the shaft 39 and the screw tightening fork 37 are mutually connected. To prevent the bottle from rotating, screw in a machine screw 46 so that its tip lightly contacts the smooth surface 45.Furthermore, the screw tightening fork 37,
Between the stops 42 of the shaft 39, a spring 4 is inserted as shown in FIG.
3 and urges the screw tightening fork 37 downward.

Then, as shown in FIG. 17, the male thread 4o of the shaft 39 is screwed into the female thread 41 of the seal plug 4, and the fastening pawl 47 of the screw tightening fork 37 is engaged with the recess 48 of the seal plug 4. The seal plug 4 is attached to the shaft 39 & on which the screw tightening fork 37 of the plug tightening machine 38 is attached.

As described above, the plug tightening machine 38 with the seal plug 4 attached thereto is attached to the gate valve 7 as described above.
Next, when the gate valve 7 is opened, the shaft 39 of the plug tightening machine 38 is advanced, and the shaft 39 is rotated clockwise, as shown in FIG. The sealing plug 4 is engaged with the four parts 48 of the plug 4.
The male thread 19 of the seal plug 4 is screwed into the female thread 18 of the fitting 1 as shown in FIG. 22, and the seal plug 4 is attached to the fitting 1 to seal the upper part of the fitting 1.

Next, when the shaft 39 is rotated in the opposite direction, as shown in FIG. Since it is unscrewed from the female thread 41 of the seal plug 4, the shaft 39 of the plug tightening machine 38 is removed from the seal plug 4 with the screw tightening fork 37 still attached.

Then, as shown in FIG. 24, remove the plug tightener 38 and the gate valve 7 from the fitting l, and
A concrete pit 36 is provided around the fitting 1, and the upper surface of the part where the fitting 1 is provided is made flush with other road surfaces, etc., and the construction is completed. Then, there will be no protruding objects on the road surface, and it will be possible to use it as a road.

[Problem to be solved by the invention]

In the conventional construction method, the bypass circuit 16 is provided from the upstream side to the downstream side of the valve insertion location 6 of the main pipe 5, so the construction period is long, and the flow rate in the bypass circuit 16 is small, so there are The present invention was made in consideration of the above-mentioned problems, and is a method of inserting a valve into a pipeline, which requires a short construction period and is not limited by the construction time. The technical challenge is to obtain a valve for use in this method.

[Means to solve the problem]

A cylindrical adapter 111 is attached to the fitting 1 attached to the outer periphery of the main pipe 5, a gate valve 7 is attached to the adapter 111, and a drilling machine 200 is attached to the gate valve 7.
Cut the main pipe 5 with the cutter 201 of L Next Place the cutter 201 into the punching machine 200 and remove the cut part, close the gate valve 7, remove the punching machine 200 and put the +4 stopper on the legate valve 7. Plug 1 in which the fixed shaft 103 and expansion shaft 102 fitted with 101 are tightly fitted.
05 is attached to the shaft 39 via the screw tightening fork 37, the gate valve 7 is opened, the plug 105 is screwed onto the adapter 111, and the stopper 101 is held within the adapter 111. Next, remove the gate valve 7 and the plug tightening machine 38 from the adapter 111, connect the fixed extension shaft 119 to the fixed shaft 103, and connect the expansion extension shaft 116 and the contraction extension shaft 117 to the expansion shaft 102.
In this method, the stopper 101 is inserted into the perforated part of the main pipe 5 by each extension shaft to enlarge it, and the main pipe 5 is closed so that the valve is inserted into the pipe.

The expansion shaft 1 is attached to the fixed shaft 103 on which the stopper 101 according to claim 2 is attached.
02 is rotatably inserted and the expansion shaft 102 is rotated to contract or expand the stopper 101 and close the conduit. In this valve, the expansion shaft 102 is tightly fitted into the fixed shaft 103. In addition, a plug 105 that can seal the cylindrical adapter 111 attached to the fitting 1 attached to the main pipe 5 and the fixed shaft 103
A fixed shaft 103 +3 is formed so as to be removably connected to the fixed shaft 103 +3, which is tightly fitted so as to be slidable up and down, and a fixed extension shaft 119 that can be slid up and down with the fixed shaft 103. [Embodiment] Figures 1 to 7 are diagrams for explaining the present invention in detail.

This example 1 fitting 1, gate valve 7,
And 38 plug tightening machines Figures 9 to 11
and 171. The same apparatus as the conventional example shown in FIGS. 19 to 21 and 23 is used.

The adapter 111 used in this embodiment is formed into a cylindrical shape and includes a lower flange that matches the flange 2a of the fitting 1, as shown in FIG.
A lower flange is attached to the adapter 111 with bolts (not shown), and an upper flange is provided at the upper end of the adapter 111, and a female thread 123 is provided inside the upper portion.

A plug 105 is attached to the adapter 111 and can seal the upper part of the adapter 111.A sealing O-ring 25 is fitted below the flange as shown in FIGS. 1 and 3. A male thread 104 that can be screwed into the female thread 123 of the adapter 111 is provided, and the four parts 4 provided on the seal plug 4 shown in FIG. 18 are provided on the top surface.
The recesses 48 similar to 8 are provided on two sides.

A cylindrical fixed shaft 103 is tightly fitted into a circular hole provided at the center of the inner side of the plug 105 via a packing 106 so as to be vertically slidable. On the inside, an expansion shaft 102 which is formed to be able to move up and down together with the fixed shaft 103 and to be rotatable relative to the fixed shaft 103 is tightly fitted through a carton 106 .

A left-handed male thread is provided on one side of the outer periphery of the upper portion 102a and lower portion 102b of the expansion shaft 102, and a right-handed male thread is provided on the other side.

Furthermore, an upper collar 131 is provided below the fixed shaft 102, and a female thread is provided inside the upper collar 131 to be screwed into the external male thread in the upper part 102a below the expansion shaft 102. and the expansion shaft 1
A lower collar 132 formed separately from the upper collar 131 is externally fitted and screwed into the male thread of the lower part 102b of the lower part 102b.

Six upper wedges 135 are attached radially around the outer circumference of the upper collar 131, and the lower collar 132
Similarly, six lower wedges 136 are attached to the outer periphery. This upper wedge 135 and lower wedge 13
The inner edge number of the sloping upper part of the six wings 138 formed in a chevron shape is 0, and the inner edge number of the lower part sloping on the opposite side is 1, which is fitted and abuts on the wing 138. Cylindrical stopper 1 with a vertical slit 12 for the outside of
01, and a rubber number is pasted on the outer periphery of this stopper 101.

The expansion shaft 102 is relative to the fixed shaft 103.
When rotated in one direction, the upper collar 131 moves downward, and the upper wedge 135 moves downward.
The lower collar 132 moves upward and the lower wedge 13
6 upward to push out the wings 138 radially outward and enlarge the stopper 101. Furthermore, when the expansion shaft 102 is rotated in the other direction, each of the parts moves in the opposite direction, thereby reducing the outer diameter of the stopper 101.

Also, in order to prevent the stopper 101 from coming off from the plug 105, a male thread 10 is provided at the upper end of the fixed shaft 103.
Step 7: Screw the holder 109 together,
The plug 105 is brought into contact with a packing stopper 108 screwed onto the plug 105, and a large diameter female thread 110 is provided at the upper end of the expansion shaft 102.
There is a small-diameter left-handed female thread number 1 with a step below the wire hole.

Then, as shown in FIG. 5, the male thread 107 of the fixed shaft 103 is screwed into the female thread 118 of a cylindrical fixed extension shaft 119 formed to have the same outer diameter, so that the fixed shaft 103 is removably attached. A male screw 115 of a cylindrical expansion extension shaft 116 formed to have the same outer diameter as the expansion shaft 102 is screwed into the large diameter female thread 110 of the expansion shaft 102 so that it can be attached and removed. The small diameter left-handed female thread No. 1 of the expansion shaft 102 is connected to the left-hand male screw 124 of the contraction extension shaft 117 inserted into the cylindrical expansion extension shaft 116. are formed to be screwed together and removably connected.

As shown in Figure 2, the flange provided at the lower end of the cylindrical part of the drilling machine 200 matches the 7 langes of the gate valve 7,
When installed with bolts (not shown), the hole @Zoo can be sealed, and this drilling machine 200 includes a cutter 20 that is configured to be rotated by a drive device (not shown).
1 is provided, and this cutter 201 is formed to have a larger diameter than the outer diameter of the main pipe 5. After cutting the main pipe 5: Hold the cut part and store it in the punching machine 200. It is designed so that it can be done.

It is also possible to make the outer diameter of the cutter 201 larger than the inner diameter of the main pipe 5 and smaller than the outer diameter of the main pipe 5. Then, l is larger than the outer diameter of this main pipe 5.
When the main pipe 5 is cut with the cutter 201 having an outer diameter of Js, the main pipe 5 is punched and cut with both sides partially connected. Therefore, cutting the main pipe 5 in this case also includes cutting the main pipe 5 by drilling it.

The stopper 101 is inserted into the main pipe 5 and the flow of the main pipe 5 is interrupted by tL as described below.

That is, as shown in FIGS. 9 and 10 and explained in detail as a conventional example, the fitting 1 is formed on the outer periphery of the main pipe 5 by the lower fitting 3, the upper fitting 2, and the neck fitting 17. Weld and install the flange Za & of this fitting L:
, As shown in Figure 2, attach the lower flange of the cylindrical adapter 111 by screwing it with a bolt (not shown).
The upper flange of this adapter 111 and the lower flange of the gate valve 7 shown in FIG. The flange provided at the lower end is fixed and attached with bolts (not shown), and the finting 1, adapter 111, gate valve 7, and inside of the drilling machine 200 are sealed off from the outside.

Blow The cutter 201 of the punching machine 200 is advanced and rotated by a drive device (not shown) to cut the main pipe 5. While holding the cut portion of the main pipe 5 with a holder 9a such as
It is housed in the cylindrical part of 0.

Next, close the gate valve 7, remove the drilling machine 200 from the gate valve 7, and insert the plugging machine 38 into the upper flange of the gate valve 7 as shown in FIG.
A flange provided at the lower end of the cylindrical part of the car is attached by fixing it with a bolt (not shown) to the shaft 39 of this plug tightening machine 38.
In FIG. 23, a screw tightening fork 37 as described in detail as a conventional example is attached, and a male thread 40 provided at the tip of the shaft 39 is attached to a plug 105 shown in FIG. Large diameter male thread 110 of expansion shaft 102
The fastening pawl 47 of the screw tightening fork 37, which is screwed onto the shaft No. 39 and is fitted in such a way that it can move up and down but cannot rotate relative to each other, is engaged with the recess 48 of the plug 105, and the screw tightening fork A shaft 39 and a plug 105 with a stopper 101 attached thereto are attached.

Next, open the gate valve 7, rotate the shaft 39 clockwise, and remove the external thread 10 of the laminated plug 105 as shown in FIG.
4 to the female thread 1 of the adapter 111 as shown in FIG.
23 to seal the adapter 111. The stopper 101, which is attached to the fixed shaft 103 tightly fitted to the plug 105, is held in the cylindrical portion of the adapter 111.

Next! M. When the shaft 39 of the plug tightening machine 38 is reversely rotated to the left, the fastening claw 47 moves into the recess 4 as shown in FIG.
8 and reverse rotation to remove the male thread 40 of the shaft 39 from the female thread 110 of the expansion shaft 102. Remove the gate valve 7 and plug tightener 38 from the adapter 111. When not in use, attach the cap to the adapter 111. Wear number 4.

Then, to stop the flow of the main pipe 5, as shown in FIG.
The female thread 118 of the fixed extension shaft 119, which is formed to have the same outer diameter as the outer diameter of the extension shaft 102, is screwed and connected to the large diameter female thread ll0 of the extension shaft 102. The male screw 115 of the cylindrical expansion and extension shaft 116 formed in the cylindrical expansion and extension shaft 116 is screwed into the connection, and the female screw No. 1 of the small-diameter left-hand thread of the expansion shaft 102 is connected to the contraction shaft inserted into the cylindrical expansion and extension shaft 116. When the left-hand male thread 124 of the extension shaft 117 is screwed on and connected, the state shown in FIG. 6 will be obtained. Push each extension shaft forward and move the stopper 10 as shown in FIG.
1 into the cut part of the main pipe 5 Expansion extension shaft 116
When rotated to the right, the upper collar 131 moves downward, the upper wedge 135 moves downward, the lower collar 132 moves upward, the lower wedge 136 moves upward, and the wing 138 is moved radially. is pushed outward to expand the stopper 101 and close the main pipe 5 to stop the flow of the main pipe 5.

Next, when the contraction extension shaft 117 is rotated to the left, each part inside the stopper 101 moves in the opposite direction to the above, and the stopper 101 is contracted tJz, so when each extension shaft is raised, as shown in FIG. so that the stopper 101 is connected to the adapter 1
The main pipe 5 housed in the cylindrical part 11 is completely dismantled.

〔Effect of the invention〕

In the present invention, a fitting is attached to one place in the main pipe, a valve is inserted into this fitting without stopping the flow of the main pipe, and the main pipe can be opened and closed by this valve, so it is possible to use the conventional construction method, namely Attach fittings to two places on the main pipe, then attach a valve to bypass the flow of the main pipe between the two fittings, and then form a bypass circuit between the two fittings and go to the main pipe. Compared to the method of inserting valves to open and close the pipe, the excavation area of the road surface where the main pipe is buried is smaller, and the amount of processing such as cutting and welding of the main pipe is one third.
Therefore, the construction period can be significantly shortened, and less equipment is needed. Since valves are installed to open and close the flow of the main pipe, the work is carried out in an orderly manner.

Further, unlike conventional construction methods, the fluid during construction does not flow through a bypass circuit, so the flow rate does not decrease over several hours during the construction period, and the time required for the flow rate to decrease can be reduced.

[Brief explanation of drawings]

1 to 7 are explanatory diagrams of a method according to an embodiment of the present invention and an apparatus according to an embodiment of the present invention, and FIG. 1 is a partial cross-sectional view of the main part of the valve. Figure 2 shows how the main pipe is disconnected Figure 3 shows how the valve is installed 1 Figure 4 shows how the valve is installed
The figure shows the state in which the valve is installed. Figure 5 shows the main part when the fixed shaft, etc. is connected to the fixed extension shaft, etc. 1.
Figure 7 shows the valve in the open state. Figure 7 shows the valve in the closed state. Figures 8 to 24 are explanatory diagrams of conventional examples. Figure 8 shows the state in which fittings are installed in two places. 1 Figure 9 shows an exploded perspective view of the fitting. Figure 10 shows a perspective view of the fitting attached to the main pipe. Figure 11 shows the state in which the main pipe is about to be cut. 1 Figure 12 shows the main pipe. Figure 13 shows the state in which the stopper is attached to the cut section. Figure 13 shows the state in which a bypass circuit is installed on the main pipe. Figure 1 is a perspective view of the main part of the stopper. Figure 15 shows the stopper installed in the main pipe. 1 Figure 16 shows the bypass circuit installed in the main pipe and the valve inserted Figure 17 shows the plugging machine and seal plug 1 Figure 18 shows a perspective view of the seal plug Figure 19 (a
) is a perspective view of the back of the screw tightening fork. Figure 19 (b)
Figure 20 (a) shows the main parts of the shaft of the plug tightening machine. Figure 20 (b) shows the main parts of the shaft and the screw tightening fork. Figure 21 shows the screw tightening fork. Figure 22 shows the main parts of the fitting closed with a seal plug Figure 23 shows the screw fork disengaged Figure 24 shows the valve has been inserted into the pipeline FIG. 1...Fitting, 5...Main pipe, 7...Gate valve, 37...Screw tightening fork, 38...Plug tightener, 39...Shaft, 101...Stopper 102...Extension shaft, 103...Fixing *set
105...Plug, 111...Adapter, 116...
- Expansion extension line 117...Reduction extension shaft, 119...Fixed extension line 200...Drilling machine, 201...Cutter Fig. 1 Fig. 32 Fig. 2 Fig. 4 Fig. 3 Fig. 5 Fig. 6 Fig. 8 Fig. 3 Figure 9 Figure 10 Figure 7 Figure 11 Section 12 Figure 0 Figure 13 Figure 15 Figure 18 Figure 19 (0) (b) Figure 20 Figure 16 Figure 17 Figure 21 Figure 22 Figure 23 Moving towards Karate Figure 24

Claims (2)

[Claims] (1) Fitting 1 attached to the outer periphery of main pipe 5,
Attach the cylindrical adapter 111, attach the gate valve 7 to the adapter 111, cut the main pipe 5 with the cutter 201 of the punching machine 200 attached to the gate valve 7, and then insert the cutter 201 into the punching machine 200. the cut portion is removed, the gate valve 7 is closed, and the drilling machine 200
is removed, and a plug tightening machine 38 is attached to the gate valve 7, in which a plug 105, in which a fixed shaft 103 equipped with a stopper 101 and an expansion shaft 102 are tightly fitted, is coupled to a shaft 39 via a screw tightening fork 37. , open the gate valve 7, screw the plug 105 onto the adapter 111 to hold the stopper 101 in the adapter 111, and then remove the gate valve 7 and plug tightening machine 38 from the adapter 111 and attach them to the fixed shaft 103. Connect the fixed extension shaft 119,
An expansion extension shaft 116 and a contraction extension shaft 117 are connected to the expansion shaft 102, and the stopper 101 is connected to the main pipe 5 by each extension shaft.
A method of inserting a valve into a conduit that is inserted into the perforated part of the pipe and enlarged so that the main pipe 5 can be closed. (2) The expansion shaft 102 is rotatably fitted into the fixed shaft 103 on which the stopper 101 is attached, and by rotating the expansion shaft 102, the stopper 101 is contracted or expanded, and the conduit can be closed. In the formed valve, the expansion shaft 102 is tightly fitted to the fixed shaft 103, and the fixed shaft 1
03 is tightly fitted in a vertically slidable manner into a plug 105 that can seal the cylindrical adapter 111 attached to the fitting 1 attached to the main pipe 5.
The valve is formed so that a fixed extension shaft 119 that can slide up and down with 03 can be removably connected to it, and the expansion shaft 102 is formed so that an expansion extension shaft 116 and a contraction extension shaft 117 can be removably connected to it.