JP2000179779A - Valve inserting method and device for non-cutoff flow, and non-cutoff flow inserting valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily carry out work for valve insertion, and downsize a sealing case. SOLUTION: This method is a valve inserting method for non-cutoff flow having an assembling process, a cutting process and a tool taking-out process. A valve element inserted into a pipe line and a cutting tool 230 are stored in a sealing case 2 in the assembling process. The case 2 is advanced toward a radial direction of an existing pipe 1 while conducting cutting motion, of the cutting tool 230, for cutting the existing pipe 1 in the cutting process to cut the pipe 1. The cutting tool 230 is taken out from the sealing case 2 in the tool taking-out process after the cutting is finished, and a valve 277 for working is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inserting a non-disruptive valve and an apparatus used for the method.

[0002]

2. Description of the Related Art Conventionally, there is a well-known method of inserting a valve into a pipe including an existing pipe by piercing the existing pipe with uninterrupted water and inserting a valve into a pierced portion of the existing pipe.

FIGS. 22 (a) and 22 (b) show USP4,
516,598 shows an outline of the conventional method of inserting a continuous water valve. In the prior art shown in this figure, the existing pipe 1 of FIG. At this time, the hole saw 802 and the valve
And housed. After this, with the hole saw 802,
A circular hole is drilled in the existing pipe 1. After this perforation, FIG.
The sealed case 800 is rotated as shown by an arrow 850 in (a), and after this rotation, the valve body 804 is inserted into the circular hole 803 in FIG.

FIG. 23 schematically shows a conventional method of inserting a watertight valve disclosed in US Pat. No. 1,989,768. In the prior art shown in this figure, the existing pipe 1 of FIG. At this time, the cutting machine 500 and the gate valve 510 are housed in the sealed case 501 in advance. Byte 50
After the existing pipe 1 is cut and removed by the cutting machine 500 having the cutting device 2, the gate valve 510 is inserted in place of the cutting machine 500.

[0005]

FIG. 22A and FIG.
(B) In the prior art shown in FIG. 23, the valve can be quickly inserted after cutting. However, these FIG.
(A), (b), and the prior art shown in FIG. 23, it is necessary to house the hole saw 802 and the cutting machine 500 having the same size as the inserted valves 804 and 510 in the sealed cases 800 and 501. The size of the sealed cases 800 and 501 increases.

FIG. 24 schematically shows a conventional method disclosed in US Pat. No. 5,611,365 and International Publication WO97 / 31207. In the method shown in FIG.
The cutting tool 602 is fixed to the tip of the gate valve 601 attached to the closed case 600, and the existing valve 1 is cut by the cutting tool 602 by rotating the gate valve 601 together with the closed case 600. According to this conventional technique, the sealed case 600 is small because the cutting tool 602 is small. However, since the cutting tool 602 is attached to the gate valve 601, the water stoppage becomes incomplete. Further, the existing pipe 1 is cut by the chip-shaped cutting tool 602. Therefore, when cutting the existing pipe 1 made of a cast iron pipe or a steel pipe, the sealed case 600 must be rotated many times, so that not only takes a long time to cut, but also the gap between the closed case 600 and the existing pipe 1 is increased. There is a possibility that the rubber packing that seals the space or the like may be damaged.

[0007]

SUMMARY OF THE INVENTION Accordingly, it is a main object of the present invention to provide a method for inserting a non-disruptive valve capable of rapidly performing valve insertion work and reducing the size of a sealed case. Another object of the present invention is to provide a non-disruptive valve insertion device and a non-disruptive flow insertion valve used in the non-disruptive valve insertion method.

[0008] In order to achieve the above-mentioned main object, the method of inserting a non-disruptive valve according to the first invention includes an assembling step, a cutting step, and a tool removing step. In the assembling step, a part of the existing pipe is hermetically surrounded by a plurality of sealing cases divided into a plurality of pieces in the circumferential direction of the existing pipe, and a valve body for insertion into a pipe line; A cutting tool fixed to a rotatably supported cutter shaft and having a plurality of cutting blades is housed in the closed case while being attached to the closed case. In the cutting step, the cutting tool is rotated around the cutter axis by the power of a motor to perform a cutting motion of cutting the existing pipe by rotation of the cutting tool, and the cutting tool is moved in a radial direction of the existing pipe. By moving at least a part of the sealed case along the existing pipe, the cutting tool performs a feeding motion by moving the existing pipe by the cutting tool without leaving a section. Cutting to form an open groove. In the tool removal step, via a work valve attached in advance to enable the cutting tool to be taken out of the sealed case, after cutting, the cutting tool is taken out of the sealed case and the work valve is closed. I do.

[0009] The method of inserting a non-disruptive valve according to the second aspect of the present invention includes an assembling step, a cutting step, and a tool removing step. In the assembling step, a part of the existing pipe is hermetically surrounded by a sealed case divided into a plurality of pieces in the circumferential direction of the existing pipe, and a gate valve body for inserting the pipe into a pipe.
In addition to the gate valve body, a cutting tool that is rotatably supported around an axis set in the radial direction of the existing pipe and has a plurality of cutting blades on the distal end surface and the outer peripheral surface of the column, It is housed in the sealed case with it attached. In the cutting step, the cutting tool is rotated around the axis by the power of a motor to perform a cutting motion for cutting the existing pipe by rotation of the cutting tool, and the cutting tool is moved in a radial direction of the existing pipe. By moving at least a part of the sealed case in the circumferential direction of the existing pipe, the cutting tool is rotated in the circumferential direction to cause the cutting tool to perform a feeding motion, and the section is rotated. By cutting the existing pipe with the cutting tool over a range of substantially half or full circumference in the circumferential direction without leaving a cutting groove, a cutting groove cut open in a range of substantially half or full circumference in the circumferential direction of the existing pipe is formed. I do. In the tool removal step, via a work valve attached in advance to enable the cutting tool to be taken out of the sealed case, after cutting, the cutting tool is taken out of the sealed case and the work valve is closed. I do.

In the present invention, the term "existing pipe" means a pipe in which a fluid such as water is flowing, and is generally buried underground. The term "sealed" does not mean completely closed, but means that water (air) tightness is maintained so that construction can be performed with continuous water (flow). Therefore, the “sealed case” refers to a case having a pressure resistance capable of withstanding the pressure of the fluid flowing in the existing pipe and a certain degree of water stopping performance. Further, "surrounding in an airtight state" means cutting or sealing to such an extent that it does not interfere with operations such as valve insertion after cutting.For example, a drain port is provided in the sealed case, The drain may be opened during cutting, and chips may be discharged together with water from the drain.

Since the "cutting tool" used in the present method has a plurality of cutting blades, the cutting tool includes a cutting tool and a cutter wheel having a single continuous cutting blade. Not. Here, in the present specification, “pillar shape”
In addition to the cylinder, the shape includes a truncated cone, a shape obtained by adding a cone to a cylinder, and a conical shape. Further, the cutting tool may have a column shape whose length is shorter than the outer diameter of the cutting tool. When cutting an existing pipe having a mortar lining on the inner surface of the pipe, a cutting tool provided with a large number of cutting blades (tips) made of cemented carbide or a cutting tool using diamond particles as the cutting blade is used. It is preferably used.

In the present invention, "cutting" refers to cutting a part of a pipe wall by rotating a plurality of cutting blades. In addition, the `` cutting motion '' refers to rotating a plurality of cutting blades, while the `` feeding motion '' refers to a position where a new portion of a pipe wall can be cut one after another by the cutting tool. Moving the cutting tool. In the present invention, "while sending the cutting tool in the radial direction of the existing pipe,
"Rotating the closed case in the circumferential direction" means that after the cutting tool is sent in the radial direction of the existing pipe, the cutting tool is sent in the radial direction of the existing pipe (while sending) in addition to rotating the closed case. , Including rotating the sealed case. In addition,
In the present invention, “inserting a valve (into a pipe)” does not mean that a valve or a valve body is physically inserted into a cut-off portion of an existing pipe, but does not stop water in an existing pipe. Or means to install a valve for adjusting the flow rate in the pipeline.

[0013] In the invention of the method of inserting a non-disruptive valve, it is not possible to directly determine whether or not the method is infringed until the method is actually implemented. It is hard to hold down. Therefore, in the present application, the scope of the right can also be defined for the following non-disruptive valve insertion device and non-disruptive flow insertion valve used in the above-mentioned method.

According to the present invention, there is provided a non-disruptive flow valve insertion device which is divided into a plurality of pipes in a circumferential direction of an existing pipe, surrounds a part of the existing pipe in an airtight state, and accommodates a partition valve body to be inserted. A sealing case having a storage portion that allows the gate valve body to move in the pipe radial direction, the hermetically sealed state, and a sealed case rotatable around the existing pipe while housing the gate valve body; A branch portion provided integrally with the closed case, into which a cutting tool for cutting the existing pipe can be inserted while the gate valve body is housed in the closed case, wherein the hole diameter of the branch portion is the gate valve It is characterized in that it is about the same as the thickness of the body or larger than the thickness of the gate valve body, and is smaller than the maximum width of the gate valve body at the portion where it enters the existing pipe. Here, the reason why the “hole diameter of the branched portion” is limited in this way will be described below. In the present invention, the diameter of the cutting tool for cutting the cutting groove is equal to the groove width of the cutting groove. On the other hand, while the thickness of the gate valve body becomes thicker than these by the compression allowance of the rubber packing, the hole diameter of the branch portion for inserting the cutting tool is slightly larger than the diameter of the cutting tool. Therefore, the hole diameter of the branch portion is substantially equal to or larger than the thickness of the gate valve. On the other hand, if the hole diameter of the branch portion is larger than the maximum width of the gate valve body, the hole diameter becomes unnecessarily large, and the conventional device is included in the scope of the present invention. Limited.

Further, in the valve for non-stop flow valve insertion according to the present invention, the gate valve body of the device for inserting a non-stop flow valve enters the existing pipe from a cutting groove formed in the existing pipe, and the first valve of the gate valve element is inserted. A gate valve body in which a rubber packing portion contacts a cutting surface forming a cutting groove of the existing pipe, and a second rubber packing portion contacts an inner peripheral surface of the existing pipe to close the valve. The existing pipe is cut in the pipe radial direction with a cutting tool having a cutting blade along a surface and a cylindrical surface, and then the cutting tool is moved along the circumferential direction of the pipe so as to be substantially halfway in the circumferential direction of the existing pipe. The first rubber packing portion has a contact surface corresponding to a cutting surface in a cutting groove formed over the range of (1). In the invention of the valve for non-separable flow insertion, it is clarified that the gate valve body accommodated in the closed case enters the existing pipe from the groove-shaped hole, thereby further clarifying the difference from the prior art. Note that "cutting over a range of approximately half a circumference in the circumferential direction" means cutting the existing pipe over a range in which the gate valve body having a size similar to the inner diameter of the existing pipe can be inserted from the cutting groove. In general, cutting is performed in the circumferential direction over a range smaller than 180 °, such as about 150 ° to 170 °.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIGS. 1 to 10 show a first embodiment. As shown in FIG. 2, the sealed case 2 constitutes a valve box and is divided into first and second divided cases 211 and 212, and divided by a rubber packing 214. The face is sealed. Note that both ends of the sealed case 2 are
Packing insert 26 into which rubber ring 264 is pressed
0 is provided. As shown in FIGS. 1 and 2, before cutting the existing pipe 1, the gate valve 8 a and the spindle 8 c are housed in the sealed case 2 in advance. The valve lid 8b forms the closed case 2 together with the first and second divided cases 211 and 212.

As shown in FIG. 2, the second divided case 2
The valve cover 12 and the valve lid 8b form a housing for housing the gate valve body 8a. In the second split case 212, a branched portion 212b through which the cutting tool 230 (FIG. 3) penetrates is provided in a protruding state so as to branch off from the accommodating portion. A main bearing 232 is fixed to the branch portion 212b in FIG. The main bearing 232 supports the main shaft 233 of the cutting tool 230 during cutting. On the other hand, the branch portion 2
12b has a drain hole 2 for discharging chips and water during cutting.
48 are provided. In addition, a drain valve is connected to the drain hole 248 as needed.

The ball valve (working valve) to cutter the main bearing 232 27
The cutting machine 3 is attached to the ball valve 277. The cutting machine 3 has a semi-annular cutting groove 1.
2C (FIG. 1) for forming the cutting tool 230
In the radial direction C, and the cutting tool 230 is rotated by the rotational force of a prime mover such as a motor or an engine to perform a cutting motion. The structure of the cutting machine 3 is similar to a well-known hole saw type non-water drilling machine, and therefore, detailed illustration and description thereof are omitted. FIG.
As shown by the phantom line, the gate valve body 8a is previously arranged at a portion corresponding to the cutting groove 12C cut by the cutting tool 230.

The assembly process Next, the procedure of inserting method of the valve. First, while the fluid (water) is flowing in the existing pipe 1 of FIG. 2, the worker attaches the closed case 2 to the existing pipe 1 and uses the assembling bolts (not shown) to split the two separate cases 211 and 211.
Assemble 212. Thereafter, the cutting machine 3 shown in FIG.
12 in advance. In this way, as shown in FIG. 1, the closed case 2 surrounds the existing pipe 1 in an airtight state.

Next, the sealed case 2 is rotated to
As shown in (5), a cutting position by the cutting tool 230 is set. That is, the operator rotates the sealed case 2 and the cutting machine 3 to a position where the axis 233a of the cutting tool 230 is nearly horizontal by human power or a winch. After this rotation, the cutting tool 230 shown by the solid line in FIG. Thereby, the cutting tool 230 is stored in the closed case 2.

After the cutting step , when the operator drives the prime mover of the cutting machine 3, the prime mover moves the cutting tool 230 to the axis 233a of the main shaft 233.
To make the cutting tool 230 perform a cutting motion for cutting the existing pipe 1 by the rotation of the cutting tool 230. While the cutting motion is being performed by the cutting tool 230,
When the cutting tool 230 is sent in the cutting direction C, the tip surface 230d of the cutting tool 230 advances to a position where it penetrates a part of the pipe wall 1a of the existing pipe 1 as shown by a two-dot chain line. Thus, the cutting by the cutting tool 230 is completed.

After this cutting, the operator rotates the sealed case 2 around the existing pipe 1 in the circumferential direction R of the existing pipe 1 in FIG. As a result, the cutting tool 230 rotates about the axis 233a while rotating about 150 ° to 160 ° along the outer circumference of the existing pipe 1 together with the closed case 2, and leaves the existing pipe 1 as a piece as shown in FIG. Without cutting into the existing pipe
To form a cut groove 12C.

Cutting Machine Removal Step (Tool Removal Step) After the formation of the cutting groove 12C, the drain hole 248 is closed with a stopper (not shown). Thereafter, the cutting tool 230 is retracted,
The ball valve 277 is closed. After this valve closing, the cutting machine 3
Is removed from the sealed case 2. After this removal, the sealed case 2 is rotated from the position shown in FIG. 5 to the original position as shown in FIG. Thereafter, the rubber ring 264 and the split ring 265 of FIG. 10 are attached, and the insertion (installation) of the valve into the pipe is completed.

Next, the structure of a gate valve 8a of a valve (valve for non-separable flow insertion) 8A inserted into a pipe will be described. The valve includes a gate valve body 8a shown in FIG. A rubber packing 8d is mounted on the gate valve body 8a. When the gate valve body 8a enters the existing pipe 1 from the cutting groove 12C, the rubber packing 8d closes the cutting groove 12C and presses against the inner surface 1b of the existing pipe 1. That is, as shown in FIGS. 8C and 8D, the rubber packing 8d is pressed against the first rubber packing portion 8d1 pressed against the cutting surface 12f of the cutting groove 12C and the inner peripheral surface 1b of the existing pipe 1. The second rubber packing portion 8d2 is formed continuously. 8 (a) and 8 (a).
The first and second rubber packing portions 8d shown in FIG.
First and second mounting grooves 8 for mounting 1,8d2
a1 and 8a2 are formed.

The gate valve 8a is closed at any time as shown in FIGS. Thus, in this embodiment, the work upper tank is not required, and the work valve 2 is not required.
77 becomes extremely small. Also, after cutting, the working valve 27
Since it is not necessary to open the valve 7 and house the gate valve body 8a in the sealed case 2, the construction period is significantly reduced.

Second Embodiment FIGS. 11 and 12 show a second embodiment. In FIG. 11, in the present embodiment, the entire closed case 21A is
1a, 21b and a valve lid 21d, and a gate valve 25 that moves in the radial direction of the existing pipe 1 is accommodated in the sealed case 21A. On the other hand, the closed case 21A is provided with a take-out cylinder 21c2 provided with the working valve 20 on the opposite side of the gate valve body 25. In the present embodiment, the cutting tool 30 is fed in the radial direction from the state shown in FIG.
0 °) The existing pipe 1 is cut. After the cutting, the work valve 20 is closed while the cutting machine 3 is removed, and the cutting tool 30 and the like are withdrawn.

Thereafter, the opening of the take-out cylinder 21c2 is closed by a closing member 37 for closing the take-out cylinder 21c2 in FIG. That is, after joining the closing cap 38 to the flange portion 21c3 of the take-out tube portion 21c2, the working valve 20 is opened, the male screw member 36 is screwed in, and the opening of the take-out tube portion 21c2 is closed by the closing member 37 inside the sealed case 21A. It is closed in the shape along the peripheral surface. The closing member 37 is
A rubber cap fixed to the tip of an operation rod 39 slidable on the closing cap 38 via a male screw member 36;
It has a curvature along the inner circumference of the sealed case 21A.

In this embodiment, the valve boxes 21a and 21a of FIG.
The existing pipe 1 is surrounded by the closed case 21A in a state where the gate valve body 25 is stored in advance in the closed case 21A constituting the valve lid 1d and the valve lid 21d. As described above, since it is not necessary to open and close the operation gate valve to insert the gate valve body 25 into the pipeline, the operation can be simplified and the construction time can be shortened.

Third Embodiment FIGS. 13 and 14 show a third embodiment. In this embodiment, the cutting tool 230 is provided at a position displaced in the axial direction of the sealed case 2 with respect to the valve 8A. In the present embodiment, first, the existing pipe 1 is cut by the cutting tool 230 over the entire circumference. Next, the sealed case 2 is moved to the right in the axial direction of the existing pipe 1 so that the position of the gate valve body 8a corresponds to the position of the cutting groove 12C as shown in FIG.

The present invention can be applied not only to the case where the gate valve is inserted into the pipeline, but also to the case where the butterfly valve is inserted.
When the butterfly valve is inserted, the cutting groove is cut along the pipe axis direction of the pipe. Also in the first embodiment shown in FIGS. 1 to 10, as shown in FIG. 14, the valve body 8a to be inserted and the cutting position are shifted in the pipe axis direction, and after cutting, the sealed case 2 is moved in the pipe axis direction. You may move to

Modification FIG. 15 shows a modification of the first embodiment shown in FIGS.
In this modification, a female screw 310 is formed at both ends of the sealing case 2 of the gate valve 8A without providing the packing insertion portion 260. A so-called set screw is screwed into the female screw 310.

Fourth Embodiment FIGS. 16 to 19 show a fourth embodiment. Sealed case 2
Is provided with first and second divided cases 211, 212 divided in the circumferential direction R of the existing pipe 1 and a valve lid 8b, and as shown in FIG. The part is hermetically surrounded. The second divided case 212 and the valve lid 8b
Forms an accommodating portion 80 that accommodates the inserted valve element 8a and allows the valve element 8a to move in the pipe radial direction C. The sealed case 2 is rotatable around the existing pipe 1 in the airtight state and in a state in which the valve body 8a is housed.

In the second split case 212, the branch portion 21 is located at a position shifted in the pipe axis direction S with respect to the accommodation portion 80.
2b are provided integrally. Therefore, the cutting tool 230 (FIG. 3) can be inserted into the branched portion 212b while the valve body 8a is housed in the closed case 2. In addition,
In the present embodiment, a female screw 311 is formed in the branch portion 212b, and the branch portion 212b can be closed by screwing a plug into the female screw 311.

A working gate valve 277 is attached to the branch portion 212b. The flange surface 302 for attaching the work gate valve 277 and the valve lid 8b is shown in FIG.
As shown in (a) and (b), they are provided flush with each other (on the same plane).

The hole diameter (minimum diameter) D of the branched portion 212b
Is about the same as the thickness T of the valve body 8a or the thickness T of the valve body 8a.
18 and smaller than the maximum width W1 at the portion of the valve body 8a in FIG. 18 that enters the existing pipe 1. In addition, the second divided case 212 has the structure shown in FIG.
16 having a diameter smaller than the hole diameter D of the branch portion 212b of FIG.
Drain holes 248 are formed.

Next, the method of this embodiment will be briefly described. In this embodiment, similarly to the above-described first embodiment, first, a cutting groove 12C is cut in the existing pipe 1 of FIG. 17B. Next, the sealed case 2 shown in FIG. 17B is moved to the right in the pipe axis direction S, and the valve body 8a is
Match the position of 2C. Thereafter, the spindle 8c shown in FIG. 18 is rotated to shut off the gate valve 8A as shown in FIG. After this water stoppage, the valve body holding screw 30
4 and screw-in the valve body 8a with the valve body holding screw 304.
Fix the valve body 8a so as to keep the valve closed state. After this fixing, the work partition valve 277 shown in FIG.
11 is screwed with a plug (not shown) to
12b is closed. Further, the valve cover 8b and the spindle 8c in FIG. 19A are removed, and a plate flange 305 is attached to the flange surface 302 in FIG. 19B, and the branch portion 212b and the housing portion 80 are covered. That is, the gate valve body 8a inserted in the present invention may be a valve for always closing the existing pipe 1 (a so-called "stopper").

Gate Valve Next, the gate valve 8a according to the first and fourth embodiments of the present invention will be described in different terms. The gate valve body 8a is formed from the cutting groove 12C formed in the existing pipe 1 of FIG.
And the first rubber packing portion 8d of the gate valve body 8a.
1 is a cutting surface 12 forming a cutting groove 12C of the existing pipe 1
f, and the second rubber packing portion 8d2 is pressed against the inner peripheral surface 1b of the existing pipe 1 to close the valve. The first rubber packing portion 8d1 is a cutting tool 2 having a tip surface 230d of FIG. 3 and a cutting blade 230f along a substantially cylindrical surface.
At 30, the existing pipe 1 is cut in the pipe diameter direction C.
As shown in FIG. 5, the cutting tool 230 is moved (rotated) along the circumferential direction of the pipe to cut the cutting groove 12C formed in the circumferential direction of the existing pipe 1 over a range of about 180 ° (about half a circumference). It has a pressure contact surface corresponding to the surface 12f.

Here, if the cutting groove 12C in FIG. 7 is narrower in the pipe axis direction S than the circular opening, the sealed case 2 becomes smaller in the pipe axis direction S and the gate valve body 8a becomes Receiving area is reduced. Therefore, in the present invention, while the cutting groove 12C is formed in a groove shape narrower in the pipe axis direction S than in the pipe diameter direction, the first rubber packing portion 8d
It is only necessary that 1 has a shape along the cutting surface 12f of the cutting groove 12C.

As shown in FIG. 20, in the gate valve body 8a of the present invention, both ends 8d3 of the first rubber packing portion 8d1 in pressure contact with the cutting surface 12f in the pipe diameter direction are connected to the second rubber packing portion. A step portion is formed with respect to 8d2, and the step portion 8d3 has a surface 8d5 that intersects the intrusion direction C of the gate valve body 8a. Such an intersection plane 8d5
Prevents the existing pipe 1 from being damaged from both ends of the cutting groove 12C even if it comes into contact with the cutting surface 12f with a large force.

As shown in FIG. 8, the first rubber packing portion 8d1 in each of the above-described embodiments has a pair of first rubber packing portions formed along the cross section of the existing pipe 1 except for both ends 8d3 in the pipe diameter direction. It has a press contact surface 8d4. In addition, the first rubber packing portion 8d1 is configured to connect the two first press contact surfaces 8d4 to the both end portions 8d4.
It has a substantially U-shaped second pressure contact surface 8d5 connected at d3. In the second press contact surface 8d5, the first rubber packing portion 8d1 of FIG. 20 is curved in the tube axis direction S and the tube circumferential direction R toward the second rubber packing portion 8d2 at both ends in the tube radial direction. Is formed.

In the above-described embodiment, an example in which cutting is performed with the column-shaped cutting tool 230 has been described. However, in the present invention, cutting may be performed with the disk-shaped cutting tool 230 as shown in FIG. In this case, as shown in FIG. 20 (b), the cutting groove 12C does not have a U-shape at both ends and has a constant width W.
However, this case is also included in the scope of the present invention.

Next, another method of using the gate valve 8a will be described with reference to FIG. In FIG. 21A, the gate valve body 8a has the first pressure contact surface 8d4 on only one side.
Now, a bypass (branch pipe) 300 is connected to the valve 8A, and after the gate valve body 8a is lowered to close the valve, the existing pipe 1 is cut off and the mechanical cap 301 shown in FIG. Thereafter, when the gate valve body 8a is raised, the flow of the existing pipe 1 can be directed to the bypass 300 side. That is, the case where the gate valve body 8a has the first pressure contact surface 8d4 on only one side is also included in the scope of the present invention. In other words, the gate valve body 8a does not need to be in contact with all of the cutting surface 12f forming the cutting groove 12C, but may be in contact with only one side.

In the present invention, the rubber packing 8d of the gate valve body 8a may cover both side surfaces 8a3 of the gate valve body 8a in FIG.
The entire part of the pipe a that enters the existing pipe 1 may be covered with rubber.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art can easily envisage various changes and modifications within the obvious scope by referring to the present specification. There will be. For example, an engine may be used in addition to a motor as a prime mover for giving a cutting motion to a cutting tool. Alternatively, the prime mover may be installed on the ground, and the power of the prime mover may be transmitted to the cutting tool via a cutter shaft by a flexible shaft. After the existing pipe is surrounded by the sealed case, a cutting tool may be attached to the sealed case. Furthermore, after cutting the existing pipe 1, a branch pipe may be connected to the closed case via a gate valve.

When cutting an existing pipe with a cutting tool, it is generally preferable to feed the cutting tool substantially toward the center in the radial direction of the existing pipe as in the above-described embodiments. It is not necessary to go to, but it is sufficient to send in the radial direction. Further, the closed case may be divided into three or four in the circumferential direction. Further, the valve body may be inserted from any direction such as above, side, or below. Further, the present invention can be applied to gas pipes as well as water pipes. That is, the fluid flowing through the existing pipe is not limited to water but may be another fluid such as gas or oil, which is included in the scope of the present invention. Further, an emergency shutoff valve may be inserted according to the present invention. Accordingly, such changes and modifications are to be construed as being within the scope of the invention as defined by the appended claims.

[0046]

As described above, according to the present invention,
At the time of cutting, the cutting tool itself can be rotated separately from the sealed case to cut the existing pipe, so that a cast iron pipe or a steel pipe can be cut in a short time. In addition, since the valve element is housed in the sealed case before cutting, an upper tank for work is not required, and since the groove is opened with a small cutting tool, the work valve is also reduced in size. Therefore, the entire non-disruptive valve insertion device is reduced in size. Further, since it is not necessary to open the work valve after cutting and to house the valve body in the sealed case, the construction period is significantly reduced.

Further, in the case where the gate valve is inserted by opening a groove over substantially half a circumference instead of a circular hole, there is an advantage that the gate valve and the non-disruptive valve insertion device are compact.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a closed case according to a first embodiment of a method of inserting a non-breakable flow valve according to the present invention is attached.

FIG. 2 is a cross-sectional view of the same.

FIG. 3 is a cross-sectional view showing an attached state of the cutting tool.

FIG. 4 is a cross-sectional view showing a state after the start of the cutting.

FIG. 5 is a sectional view showing a state after the completion of the cutting.

FIG. 6 is a longitudinal sectional view showing a piping structure after a valve is inserted.

FIG. 7 is a perspective view showing a gate valve body and an existing pipe.

FIGS. 8 (a) and (b) are a side view and a front view showing a rubber packing of a gate valve, and FIGS. 8 (c) and (d) are cross-sectional views showing a piping structure after the gate valve is inserted. It is a longitudinal cross-sectional view.

FIG. 9 is a longitudinal sectional view showing the valve closing state.

FIG. 10 is a transverse sectional view showing the valve closing state.

FIG. 11 shows the second method of the non-disruptive valve insertion method according to the present invention.
It is sectional drawing before cutting which shows embodiment.

FIG. 12 is a cross-sectional view after the completion of the cutting.

FIG. 13 is a diagram showing a third method of the non-disruptive valve insertion method according to the present invention.
It is sectional drawing before cutting which shows embodiment.

FIG. 14 is a cross-sectional view after the completion of the cutting.

FIG. 15 is a perspective view showing a partially cutaway insertion valve according to a modification of the first embodiment.

FIG. 16 is a perspective view showing a non-disruptive insertion valve and the like according to a fourth embodiment.

17A and 17B are a plan view and a sectional view, respectively, showing a device for inserting an interrupted flow valve and a valve for inserting an interrupted flow.

FIG. 18 is a cross-sectional view showing the non-dischargeable insertion valve in an open state.

FIG. 19 is a cross-sectional view showing the valve in a closed state.

FIG. 20 is a perspective view showing another example of the gate valve body and a perspective view showing another example of the cutting groove.

FIG. 21 is a sectional view of a piping structure showing another application of the present invention.

FIG. 22 (a) is a cross-sectional view showing a state before cutting in a conventional method of inserting a waterless valve. (B) is a sectional view showing a state after the cutting.

FIG. 23 is a cross-sectional view after inserting a valve, showing another conventional method of inserting a non-stop water valve.

FIG. 24 is a cross-sectional view showing still another conventional non-water shutoff valve insertion method.

[Explanation of symbols]

 1: Existing pipe 1b: Inner peripheral surface 2: Sealed case 8A: Gate valve (valve for non-stop flow insertion) 8a: Gate valve 8b: Valve lid 8d: Rubber packing 8d1: First rubber packing part 8d2: Second rubber packing Part 12C: Cutting groove 12f: Cutting surface 211: First divided case 212: Second divided case 212b: Branched portion 230: Cutting tool 230d: Tip surface 230e: Outer peripheral surface (cylindrical surface) 230f: Cutting blade 2311: ( 1st motor for tool rotation) C: Cutting direction (radial direction) R: Circumferential direction

Claims (17)

[Claims] 1. A non-separable flow valve insertion method comprising an assembling step, a cutting step, and a tool removing step, wherein in the assembling step, a part of an existing pipe is divided into a plurality of pieces in a circumferential direction of the existing pipe. A cutting tool fixed to a rotatable and separately supported cutter shaft and having a plurality of cutting blades, which is enclosed in a hermetically sealed state by a closed case and is inserted separately from the valve body into the pipeline, In the cutting step, the cutting tool is rotated around the cutter shaft by the power of a prime mover, and the existing pipe is cut by the rotation of the cutting tool. While performing the movement, the cutting tool is sent in the radial direction of the existing pipe, and at least a part of the sealed case is moved along the existing pipe, thereby causing the cutting tool to perform a feeding motion. By cutting the existing pipe with the cutting tool without leaving a section to form a cut-out groove, in the tool removal step, the cutting tool is attached in advance so that the cutting tool can be removed from the sealed case. A non-disruptive flow valve insertion method in which the cutting tool is taken out of the closed case after the end of cutting through the work valve and the work valve is closed. 2. A non-separable flow valve insertion method comprising an assembling step, a cutting step, and a tool removing step, wherein in the assembling step, a part of an existing pipe is divided into a plurality of pieces in a circumferential direction of the existing pipe. A partition valve body for airtightly surrounding by a closed case, and a partition valve body for insertion into a pipe line and separately supported from the partition valve body are rotatably supported around an axis set in a radial direction of the existing pipe, and a tip of a column. A cutting tool having a plurality of cutting blades on the surface and the outer peripheral surface, respectively, is housed in the sealed case in a state attached to the sealed case, and in the cutting step, the cutting tool is moved around the axis by the power of a motor. While rotating and performing a cutting motion for cutting the existing pipe by rotation of the cutting tool, the cutting tool is sent in a radial direction of the existing pipe, and at least a part of the sealed case is closed to the existing pipe. Previous By rotating in the circumferential direction, the cutting tool is rotated in the circumferential direction to cause the cutting tool to perform a feeding motion, so that the existing pipe is substantially half-circulated in the circumferential direction by the cutting tool without leaving a section. Or, by cutting over the entire circumference, a cutting groove is formed that is cut open in the circumferential direction of the existing pipe over a substantially half circumference or the entire circumference.In the tool removal step, the cutting tool can be taken out of the sealed case. A non-disruptive valve insertion method for taking out the cutting tool from the hermetically sealed case after the end of cutting and closing the work valve via a work valve attached in advance. 3. A method for inserting a non-disruptive valve including an assembling step, a cutting step and a tool removing step, wherein in the assembling step, a part of an existing pipe is divided into a plurality of pieces in a circumferential direction of the existing pipe. A partition valve body for airtightly surrounding by a closed case, and a partition valve body for insertion into a pipe line and separately supported from the partition valve body are rotatably supported around an axis set in a radial direction of the existing pipe, and a tip of a column. A cutting tool having a plurality of cutting blades on the surface and the outer peripheral surface, respectively, is housed in the sealed case in a state attached to the sealed case, and in the cutting step, the cutting tool is moved around the axis by the power of a motor. While rotating and performing a cutting motion for cutting the existing pipe by rotation of the cutting tool, the cutting tool is sent in a radial direction of the existing pipe, and at least a part of the sealed case is closed to the existing pipe. Previous By rotating in the circumferential direction, the cutting tool is rotated in the circumferential direction to cause the cutting tool to perform a feeding motion, so that the existing pipe is substantially half-circulated in the circumferential direction by the cutting tool without leaving a section. By cutting over the range of the above, to form a cutting groove cut open over a range of approximately half the circumference in the circumferential direction of the existing pipe, in the tool removal step, after the end of the cutting, insert the non-separable flow valve to remove the cutting tool from the sealed case Construction method. 4. An existing pipe is divided into a plurality of pieces in a circumferential direction, surrounds a part of the existing pipe in an airtight state, accommodates a gate valve element to be inserted, and the gate valve element extends in a pipe radial direction. It has a storage part that allows it to move, in the airtight state, and
A sealed case rotatable around the existing pipe with the gate valve housed therein, a cutting tool provided in the closed case, and cutting the existing pipe with the gate valve housed in the sealed case; And a branch portion into which the hole diameter of the branch portion is substantially equal to or larger than the thickness of the gate valve body, and a portion of the gate valve body that enters the existing pipe. The non-disruptive valve insertion device, which is smaller than the maximum width in the above. 5. The non-disruptive valve insertion device according to claim 4, wherein a working valve is attached to the branch portion. 6. The non-disruptive valve according to claim 4, wherein the closed case includes two or more divided cases divided in a circumferential direction, and the branch portion and the housing portion are provided in one divided case. Insertion device. 7. The non-disruptive valve insertion device according to claim 4, wherein the branch portion is provided so as to branch from the storage portion. 8. The non-disruptive valve insertion device according to claim 4, wherein the branch portion is provided so as to be displaced in the pipe axis direction with respect to the accommodation portion. 9. The non-disruptive valve insertion device according to claim 4, wherein a drainage hole smaller in diameter than the branch portion is formed integrally with the closed case. 10. A valve for non-disruptive flow insertion, comprising: the device for inserting a non-disruptive flow valve according to claim 4; and a gate valve element housed in the housing part. 11. The method according to claim 10, wherein the gate valve body is formed so as to be insertable into a groove-shaped cutting groove cut by the cutting tool over a range of approximately a half circumference in a circumferential direction of the existing pipe. For continuous flow insertion. 12. The cutting tool according to claim 11, wherein the existing pipe is cut in a pipe radial direction with a cutting tool having a cutting edge along a tip surface and a cylindrical surface, and thereafter, the cutting tool is moved along a circumferential direction of the pipe. The gate valve body is formed so as to be inserted into a groove-shaped cutting groove which is cut in a substantially half-circumferential direction in the circumferential direction of the existing pipe. 13. The valve according to claim 10, wherein the gate valve body enters into the existing pipe through a cutting groove formed in the existing pipe, and the first rubber packing portion of the gate valve element forms a cutting groove in the existing pipe. Contact with the cutting surface
A rubber valve seal is a gate valve body that comes into contact with the inner peripheral surface of the existing pipe to close the valve. The existing pipe is cut in a pipe radial direction with a cutting tool having a cutting blade along a tip surface and a cylindrical surface. Then, by moving the cutting tool along the circumferential direction of the pipe, the contact surface corresponding to the cutting surface in the groove-shaped cutting groove formed over a range of approximately half a circumference in the circumferential direction of the existing pipe, The non-separable flow insertion valve, which is provided in the first rubber packing portion. 14. The gate valve according to claim 10, wherein the gate valve element enters the existing pipe from a cutting groove formed in the existing pipe, and the first rubber packing portion of the gate valve element cuts the cutting groove of the existing pipe. A gate valve body that comes into contact with a cutting surface to be formed and a second rubber packing portion comes into contact with an inner peripheral surface of the existing pipe to be in a valve-closed state, wherein the cutting groove has a pipe axial direction rather than a pipe radial direction. Wherein the first rubber packing portion has a shape along the cutting surface of the cutting groove, while the groove is formed in a narrow groove shape. 15. The gate valve according to claim 10, wherein the gate valve body penetrates into the existing pipe from a cutting groove formed in the existing pipe, and the first rubber packing portion of the gate valve body cuts the cutting groove of the existing pipe. A gate valve body that comes into contact with the cut surface to be formed and the second rubber packing portion comes into contact with the inner peripheral surface of the existing pipe to be in a valve-closed state; The two ends in the radial direction of the pipe form a step with respect to the second rubber packing part, and the step has a surface intersecting the direction of entry of the gate valve body. Insertion valve. 16. The gate valve according to claim 10, wherein the gate valve body enters the existing pipe from a cutting groove formed in the existing pipe, and the first rubber packing portion of the gate valve body cuts the cutting groove of the existing pipe. A gate valve body that comes into contact with a cutting surface to be formed and a second rubber packing portion comes into contact with an inner peripheral surface of the existing pipe to be in a valve-closed state, wherein the first rubber packing portion is provided in a pipe radial direction. A portion excluding both ends has a first contact surface formed along the cross section of the existing pipe; and a second contact surface connecting the first contact surface to the second rubber packing portion at the both ends. A valve for non-disruptive insertion. 17. The gate valve according to claim 10, wherein the gate valve body enters into the existing pipe from a cutting groove formed in the existing pipe, and the first rubber packing portion of the gate valve body cuts the cutting groove of the existing pipe. A gate valve body that comes into contact with a cutting surface to be formed and a second rubber packing portion comes into contact with an inner peripheral surface of the existing pipe to be in a valve-closed state, wherein the first rubber packing portion is provided in a pipe radial direction. A pair of first contact surfaces that are substantially parallel to each other along the cross section of the existing pipe except for both ends, and a substantially U-shaped second contact surface that connects these two first contact surfaces at the both ends. And a valve for insertion without interruption.