JP4086838B2 - Existing pipe valve installation equipment - Google Patents

Description

  The present invention attaches a valve box to an existing pipe such as a water pipe, cuts and removes a part of the existing pipe sealed by the valve box, and then removes both cut residual pipe parts from the valve body insertion port of the valve box. The present invention relates to a valve installation facility for an existing pipe in which a valve body that cuts off the flow path in the pipe is inserted between the cut end faces, and an improvement of the valve body used therefor.

  In the conventional existing valve installation equipment for existing pipes, the cut and removed portions are enclosed in a sealed state across the cut and removed pipe portions of the cut and removed portions of the existing pipe, and between the cut end surfaces of both cut and left pipe portions. A valve box with a split structure in which a connecting cylindrical portion having a valve body insertion opening that opens in the pipe diameter direction is formed in a portion corresponding to the above is mounted, and both cuts are left from the valve body insertion opening of this valve box. A valve body including a first elastic seal member that can be pressed against a first valve seat formed on the inner wall surface of the valve box is inserted from the radial direction through the cut end surface of the pipe portion. At one end in the direction, a second elastic sealing material that can be pressed against the second valve seat formed on the inner peripheral wall surface of the connecting cylindrical portion facing the valve body insertion port in a state of being continuous with the first valve seat is provided. Lids are formed to protrude on both sides in the tube axis direction.

And the 1st elastic sealing material of the valve body inserted through between the cutting | disconnection end surfaces of both cutting | disconnection residual pipe parts from the valve body insertion port of a valve box is press-contacted to the 1st valve seat formed in the inner wall surface of a valve box. At the same time, the second elastic sealing material of the lid portion protruding from one end portion in the insertion direction of the valve body is brought into pressure contact with the second valve seat formed on the inner peripheral wall surface of the connecting cylindrical portion, thereby allowing the flow of the existing pipe to flow. At the same time as the passage is blocked, the valve body insertion port of the valve box is sealed.
(See Patent Document 1).

Japanese Patent Laid-Open No. 11-304074

  In the conventional existing valve installation equipment, when the valve body is in the flow path blocking posture, the first elastic sealing material of the valve body is pressed against the first valve seat formed on the inner wall surface of the valve box, and the valve The second elastic sealing material of the lid portion protruding from one end of the body in the insertion direction is pressed against the second valve seat formed on the inner peripheral wall surface of the connecting tubular portion of the valve box. 1 Since the elastic sealing material is only pressed against the first valve seat of the valve box from the valve insertion direction, the insertion of the valve body is performed as compared with one end side of the valve body in the insertion direction of the valve body. The other end portion in the direction is easily bent and deformed by the fluid pressure, which causes a decrease in sealing performance.

  Moreover, when cutting and removing the pipe portion to be cut and removed of the existing pipe sealed with the valve box with the cutting device, chips (chip) generated along with the cutting of the cutting device were formed on the inner wall surface of the valve box. It is easy to deposit on the first valve seat, in particular, the valve seat portion in the inner part opposite to the valve body insertion port in the radial direction. As a result, the first elastic seal material of the valve body is applied to the first valve seat of the valve box. When pressed, the first elastic sealing material was not only damaged by the accumulated chips, but also the sealing performance was reduced.

  The present invention has been made in view of the above-described actual situation, and its main problem is to suppress the bending deformation of the valve body caused by the fluid pressure, and at the same time, the inner surface facing the valve body insertion port in the radial direction. Providing valve installation equipment for an existing pipe that can suppress the accumulation of chips on the valve seat portion of the side part and can always exert the desired sealing performance reliably, and a useful valve element used therefor It is in.

The present invention encloses the cut and removed portions in a sealed state across the cut and removed pipe portions of the cut and removed portions of the existing pipe, and pipes the portions corresponding to the cut end faces of the both cut and left cut tube portions. A split structure valve box having a valve body insertion port that opens in the radial direction is mounted, and is formed on the inner wall surface of the valve box from the valve body insertion port of this valve box through the cut end faces of both cutting residual pipe parts. In addition, a valve body having a first sealing material that can be pressed against the first valve seat is inserted from the radial direction, and one end of the valve body in the valve insertion direction is continuous with the first valve seat. In an existing pipe valve installation facility in which a lid having a second sealing material that can be pressed against an inner peripheral wall surface facing the valve body insertion port or a second valve seat formed on the opening periphery of the valve body insertion port is formed . ,
Of the inner wall surface of the valve box, the inner side wall surface in the radial direction opposite to the valve body insertion port, the center passing through the center position in the tube axis direction of the tubular inner circumferential wall surface along the valve insertion direction or the valve body An inclined inner wall surface located on the other end side in the valve insertion direction is formed closer to the line side, and an inner peripheral wall surface in a state continuous with the first valve seat at the other end portion in the valve insertion direction of the valve body Or the collar part provided with the 3rd sealing material which can be press-contacted to the 3rd valve seat formed in the inclination inner wall surface may be formed.

According to the above configuration , the valve body is inserted from the valve body insertion port of the valve box through the cut end surfaces of both of the remaining cutting pipes to block the flow path of the existing pipe, and at the same time, the valve body insertion port of the valve box is sealed. At this time, the first sealing material of the inserted valve body is pressed against the first valve seat formed on the inner wall surface of the valve box and the second of the lid portion formed at one end of the valve body in the valve insertion direction. The sealing material is in pressure contact with the second valve seat formed on the inner peripheral wall facing the valve body insertion port or the opening periphery of the valve body insertion port in a state of being continuous with the first valve seat, and further, the valve insertion direction of the valve body The third sealing material of the collar portion formed at the other end is a cylindrical shape along the valve insertion direction formed in the inner portion of the valve box at the back side portion that is opposed to the valve body insertion port in the radial direction. The closer to the center line side passing through the central position in the tube axis direction of the inner peripheral wall surface or the valve body, the closer to the third valve seat on the inclined inner wall surface located on the other end side in the valve insertion direction.

  Therefore, not only the frictional force between each valve seat and the sealing material, but also the engagement action between the second valve seat and the lid through the second sealing material, and the third through the third sealing material. Due to the engagement action between the valve seat and the collar portion, it is possible to suppress the valve body in the flow path blocking posture from being bent and deformed by the fluid pressure.

  Moreover, the third valve seat is a cylindrical inner peripheral wall surface along the valve insertion direction or an inclined inner wall surface that is positioned on the other end side in the valve insertion direction as it approaches the center line side passing through the central position in the tube axis direction of the valve body. Therefore, when the cutting and removal planned pipe portion of the existing pipe sealed by the valve box is cut and removed by the cutting device, chips (chips) generated by the cutting by the cutting device are removed from the third valve seat. It can suppress that it deposits on.

  Accordingly, the deformation of the valve body due to the fluid pressure is suppressed, and at the same time, the accumulation of chips on the valve seat portion of the back side portion that is opposed to the valve body insertion port in the radial direction is also suppressed. The sealing performance can be exhibited well, and damage to the sealing material can be suppressed.

In the present invention , when the third sealing material of the flange portion of the valve body is pressed against the third valve seat, the surface of the flange portion on the other end side in the valve insertion direction and the inner surface of the bottom wall or the inclined inner wall surface of the valve box chip capable deposition gap between the facing surfaces may be formed.

According to the above configuration, when the cutting and removal planned pipe portion of the existing pipe sealed by the valve box is cut and removed by the cutting device, the chips (chips) generated by the cutting by the cutting device are on the third valve seat side. Even if it has settled down, the chips can be deposited in the gap formed between the surface on the other end side of the flange in the valve insertion direction and the opposite surface of the bottom wall inner surface or the inclined inner wall surface of the valve box. Therefore, it is possible to effectively suppress the sealing failure caused by the accumulation of chips on the third valve seat.

In the present invention , a drainage port may be formed on the inner surface of the bottom wall or the inclined inner wall surface of the valve box so that chips can be discharged together with a part of the fluid in the pipe.

According to the above configuration, when cutting and removing the pipe portion to be cut and removed of the existing pipe sealed with the valve box, the cutting is performed through the drainage port formed on the bottom wall inner surface or the inclined inner wall surface of the valve box. Since the chips generated by the cutting by the apparatus can be discharged to the outside together with a part of the fluid in the pipe, it is possible to effectively suppress the sealing failure caused by the chips accumulated on the third valve seat. be able to.

In the present invention , there may be provided fixing means for pulling and fixing the valve body from the outside of the valve box to the other end side in the valve insertion direction through the drainage port.

According to the above configuration , the valve body in the flow path blocking posture is fixed by using the drainage port for discharging chips generated along with the cutting of the cutting device together with a part of the fluid in the pipe to the outside. Because it can be pulled and fixed to the other end side in the valve insertion direction by means, there is no need for processing to attach the fixing means for temporarily fixing the valve body in the flow passage blocking posture to the valve box. In the state where the third seal material of the collar portion is in pressure contact with the third valve seat, the flow path in the pipe and the drainage port are completely shut off, so that the sealing process associated with the attachment of the fixing means is not required. Simplification and low cost of the temporary fixing structure of the body can be achieved.

In this invention , the auxiliary | assistant valve body which can be opened / closed freely may be provided in the site | part corresponding to the cutting opening of the cutting | disconnection residual pipe part of the said valve body.

According to the above configuration , even if the valve body is fixed in a flow path blocking posture pressed against each valve seat of the valve box, the valve body is opened and closed at a portion corresponding to the cutting opening of the cutting residual pipe portion. Since the auxiliary valve body that can be operated is provided, the flow rate can be reliably and easily adjusted by opening and closing the auxiliary valve body while maintaining the valve body in the flow path blocking posture.

  Therefore, the flow rate can be reliably and easily adjusted even under a condition in which the distance between the two cutting residual pipe portions of the existing pipe is narrow.

According to the first aspect of the present invention, the cut and removed portion of the existing pipe is cut and removed in a sealed state, and the cut end surfaces of the cut and removed pipe portions are enclosed. A split structure valve box having a valve body insertion opening that opens in the radial direction of the pipe is attached to a portion corresponding to the gap between the valve body insertion opening of this valve box and the cut end surfaces of both cutting residual pipe sections. A valve body provided with a first sealing material that can be pressed against a first valve seat formed on the inner wall surface of the box is inserted from the radial direction, and one end of the valve body in the valve insertion direction is provided with the first seal member. A lid provided with a second sealing material that can be pressed against the second valve seat formed on the inner peripheral wall surface facing the valve body insertion port or the opening periphery of the valve body insertion port in a state of being continuous with the valve seat is formed. It is an existing pipe valve installation facility,
  Of the inner wall surface of the valve box, the inner side wall surface in the radial direction opposite to the valve body insertion port, the center passing through the center position in the tube axis direction of the tubular inner circumferential wall surface along the valve insertion direction or the valve body An inclined inner wall surface located on the other end side in the valve insertion direction is formed closer to the line side, and an inner peripheral wall surface in a state continuous with the first valve seat at the other end portion in the valve insertion direction of the valve body Alternatively, a flange provided with a third sealing material that can be pressed against a third valve seat formed on the inclined inner wall surface is formed, and further, the inner wall of the bottom wall or the inclined inner wall surface of the valve box, 3 A drainage port through which chips can be discharged to the outside together with a part of the fluid in the pipe is formed at a portion that is blocked from the pipe flow path by the sealing material, and the bottom of the valve box and the drainage of the valve body A fixing means is provided for pulling and fixing the valve body to the other end side in the valve insertion direction through the drainage port over the portion facing the mouth. There to that point.
In the characteristic configuration according to claim 2 of the present invention, the protrusion margin in the tube axis direction of the lid portion with respect to the one end portion in the valve insertion direction of the valve body is greater than the maximum cut width between the cut end surfaces of both of the cut remaining pipe portions. And the protrusion margin in the tube axis direction of the flange portion with respect to the other end portion in the valve insertion direction of the valve body is larger than the minimum cut width between the cut end surfaces of both cut remaining pipe portions. The point is that it is made up of small.

[First Embodiment]
FIGS. 1-18 shows the gate valve V provided with the flow control function (flow control function) which is an example of a valve in the middle of the underground water pipe 1 which is an example of an existing pipe in an indefinite water state (non-continuous) Shows the valve installation equipment installed in the flow state) and the valve installation method using the same, and the valve installation equipment has a cross-sectional shape that encloses an area slightly wider than the planned cutting and removal location of the existing water pipe 1 in a sealed state An example of a work housing C including a valve box A having a substantially rectangular divided structure, a work on / off valve B that is openable and closable to form a work space sealed with the valve box A, and a cutting tool. Drilling a hole saw 4 configured to have a drilling diameter smaller than the outer diameter of the existing water pipe 1 while feeding it downward at three positions in the transverse direction of a pipe part to be cut and removed (hereinafter referred to as a cutting and removing pipe part) 1A By moving it, the existing water pipe 1 can be cut off without changing the water flow. A cutting device E that cuts and removes the pipe portion 1A to be removed into three parts with a cutting width smaller than its pipe diameter D, and an oval valve body insertion port 8 that is an upper opening of the valve box A A substantially square valve body 2B as viewed in the direction of the tube axis X in the cut-off portion of the existing water pipe 1 is integrally formed in a T shape with respect to the oblong lid portion 2A that seals the tube. In addition, longitudinally along the radial direction passing through the tube axis X to the valve body 2B opposed to the cutting opening 1a of both cutting residual pipe parts (described as cutting residual pipes before cutting) 1B. A valve body 2 in which an auxiliary valve body 3 that can be opened and closed around an axis Y is assembled, and the valve body 2 is held and passed through the valve body insertion port 8 of the valve box A and the work on-off valve B. Elevating / lowering protection that can be moved up and down to be inserted to a predetermined valve body mounting position without touching between the cut end faces 1b of the remaining cutting pipe portion 1B. Device G is provided as main components.

  As shown in FIGS. 1 to 5, the valve box A is in a sealed state with respect to a cut and removal planned pipe part 1 </ b> A of the existing water pipe 1 and a cut remaining planned pipe part 1 </ b> B for mounting the valve box continuous on both sides thereof. The lower case 6 having an upward opening that covers from below and the upper case 7 having a downward opening that covers the cutting and removal planned pipe portion 1A and the cutting remaining planned pipe portion 1B in a sealed state from above are provided as main components. The cases 6 and 7 are configured to be integrated by welding at the time of mounting on the existing water pipe 1 at the split mating surface on the virtual horizontal plane passing through the tube axis X of the existing water pipe 1 and the upper case 7. A long cylindrical connecting cylindrical portion 7B having a valve body insertion port 8 and a connecting flange portion 7A through which the hole saw 4 and the valve body 2 of the cutting device E can be inserted and removed from above and below is integrally formed on the upper end side of the cutting device E. Yes.

  Also, as shown in FIGS. 3, 4, and 18, the ends of both cylindrical case portions 6 </ b> A and 7 </ b> C that are fitted and held on the outer peripheral surface of the existing water pipe 1 among the integrated cases 6 and 7. An elastic sealing material interposed between the tapered inner peripheral surface of both cylindrical case portions 6A and 7C and the outer peripheral surface of the existing water pipe 1 is attached to the connecting flange portion formed in the tube portion in the direction of the tube axis X. A press ring 11 having a two-part structure to be compressed is fixed by a plurality of T-bolts 12 and nuts 13.

  In the lower case 6, there is a valve body insertion port at the back part opposite to the valve body insertion port 8 in the valve insertion direction (radial direction), that is, at the bottom part opposite to the valve body insertion port 8 in the vertical direction. 8 is constituted by a minor axis direction inner dimension slightly smaller than the minor axis direction inner dimension on the tube axis direction side of 8 and a major axis direction inner dimension slightly smaller than the major axis direction inner dimension of the valve element insertion port 8. A cylindrical cylindrical bottom wall portion 6C is integrally formed so as to protrude downward from the lowest end position of the existing water pipe 1, and the tube axis X is out of the inner surface 6g of the bottom wall of the cylindrical bottom wall portion 6C. As shown in FIG. 12, a cylindrical recess for escape which the center drill 4B of the drilling hole saw 4 drilled and moved at the third drilling position P3 on the vertical line passing through the tube axis X faces the portion intersecting the vertical plane passing through. 6D protrudes downward.

  As shown in FIGS. 13 to 17, of the inner wall surfaces of the integrated cases 6, 7, the valve bodies are provided on the side wall inner surfaces 6 a, 7 a facing each other in the transverse direction perpendicular to the tube axis X. The first valve seat 19A, which is pressed against the first elastic sealing material 2D provided on both side surfaces of the valve body portion 2B of the second valve body 2B in a sealed state, is bulged inward, and the connecting cylinder of the upper case 7 A second valve seat 19B to which a second elastic sealing material 2E provided on the outer peripheral surface of the lid portion 2A of the valve body 2 is pressed in a sealed state is provided on the inner peripheral wall surface 7b along the valve insertion direction of the shaped portion 7B. One valve seat 19 </ b> A is bulged inward in a state of being continuous with the valve seat 19 </ b> A, and further on the inner peripheral wall 6 b along the valve insertion direction of the cylindrical bottom wall 6 </ b> C of the lower case 6, the valve insertion direction of the valve body 2 </ b> B The third elastic sealing material 2F provided on the outer peripheral surface of the flange portion 2C integrally formed in a T shape with respect to the lower end which is the other end portion is densely A third valve seat 19C pressed against the state is formed in a state of being continuous with the first valve seat 19A, and the first valve seat 19A, the second valve seat 19B, and the third valve seat 19C are used for the valve body 2. A valve seat 19 is configured.

  Then, the valve body 2 is inserted from the valve body insertion port 8 of the valve box A through the cut end face 1b of both of the remaining cutting pipes 1B to shut off the flow path of the existing water pipe 1, and at the same time, the valve body of the valve box A is inserted. The first valve formed on the side wall inner surfaces 6a and 7a of the valve box A is formed by the first elastic sealing material 2D provided on both side surfaces of the valve body portion 2B of the inserted valve body 2 when the port 8 is sealed. The second elastic sealing material 2E of the lid portion 2A formed at one end of the valve body 2 in the insertion direction is pressed against the seat 19A and connected to the valve body insertion port 8 in a state of being continuous with the first valve seat 19A. The third elastic sealing material 2F of the flange portion 2C formed on the other end in the insertion direction of the valve body 2 is pressed against the second valve seat 19B formed on the inner peripheral wall surface 7b of the cylindrical portion 7B. Of the inner wall surface of the box A, the third valve seat 19C on the inner peripheral wall surface 6b of the cylindrical bottom wall portion 6C facing the valve element insertion port 8 in the vertical direction. It is contact.

  Therefore, not only the frictional force between the first to third valve seats 19A, 19B, 19C and the first to third elastic sealing materials 2D, 2E, 2F, but also the second through the second elastic sealing material 2E. Engagement of the valve seat 19B and the lid portion 2A in the tube axis X direction, and engagement of the third valve seat 19C and the flange portion 2C in the tube axis X direction via the third seal material 2F. Therefore, it is possible to suppress the valve body 2 in the flow path blocking posture from being bent and deformed by the fluid pressure.

As shown in FIG. 14, the valve body 2 has a vertically long rectangular shape close to a square when viewed from the tube axis direction, and has an inverted C-shaped taper shape in which the upper side length is slightly larger than the lower side length. The formed valve body portion 2B, the elliptical lid portion 2A having the length of the upper side of the valve body portion 2B as the length in the major axis direction, and the elliptical bowl having the lower side length of the valve body portion 2B as the length in the major axis direction The portion 2C is integrally formed in a substantially I shape when viewed in the transverse direction, and the protrusion margin in the tube axis X direction of the flange portion 2C is smaller than the protrusion margin in the tube axis X direction of the lid portion 2A. And a size that can be inserted without touching the cut end face 1b of both of the cut remaining pipe portions 1B, that is, a minimum cut width (minimum facing distance) between the cut end faces 1b of both of the cut residual pipe portions 1B. W1 is configured smaller than, further, 11, 13, as shown in FIG. 16, the valve insertion direction one the valve body 2 Projecting margin of a tube axis direction of the lid portion 2A against part is configured to larger than the maximum cutting width of between cutting end face 1b of the both cut leaving tube section 1B.

  As shown in FIGS. 16 and 17, the upper corner portion of the lid portion 2 </ b> A of the valve body 2 is formed on a tapered surface 2 a located on the center side toward the upper side, and the connecting cylindrical portion 7 </ b> B of the upper case 7 is formed. At a plurality of locations in the circumferential direction, when the valve body 2 is in a valve body mounting position where the pipe flow path is blocked, the valve body 2 is temporarily fixed in a state where the valve body 2 is pressed against the valve seat 19 of the valve box A. A presser bolt 21 having a tapered pressing surface 21a for pressing downward on the tapered surface 2a of the lid portion 2A is screwed from the horizontal direction to the tightening side.

  As shown in FIGS. 17 and 18, on the bottom side of the side wall of the lower case 6, on both sides in the tube axis direction of the first valve seat 19 </ b> A, that is, on the upstream side and the downstream side of the first valve seat 19 </ b> A. Is an open drainage port (an example of a drainage port) 16 that horizontally discharges chips (chips) generated by the cutting device E along with a part of the tap water (an example of a liquid). A drainage pipe (an example of a drainage pipe) 17 that is formed and communicates with each drainage port 16 is provided with a drainage valve (an example of an on-off valve) 18 that can be opened and closed.

  When the third sealing material 2F of the flange portion 2C of the valve body 2 is in pressure contact with the third valve seat 19C of the valve box A, the surface on the other end side in the valve insertion direction of the flange portion 2C, that is, the lower outer surface 2b A gap S in which chips can be accumulated is formed between the opposite face of the valve box A to the bottom wall inner surface 6g.

  Since both the drain ports 16 are dispersedly arranged on the upstream side and the downstream side of the valve body 2 in the flow path cut-off state, as shown by the phantom line in FIG. When the auxiliary valve body 3 assembled to the valve body 2 is opened by connecting both the drain valves 18 through the connecting pipe 20, the upstream side of the valve body 2 is opened by opening the both drain valves 18. Since the downstream pressure difference can be reduced, the opening and closing operation of the auxiliary valve body 3 can be easily performed with little effort.

  When the valve body 2 is secured to the valve seat 19 of the valve box A in a sealed and shut state pressed against the valve seat A, the connection flange portion 7A of the connection cylindrical portion 7B of the upper case 7 is shown in FIGS. As shown, a valve lid 22 for sealing the valve element insertion port 8 of the valve box A is fixedly connected in a sealed state via bolts 27 and nuts 28, and an auxiliary valve is provided at the center of the valve lid 22. A bearing portion 22A for supporting the upper pivot fulcrum shaft 5B of the body 3 is formed, and an opening and closing operation of the auxiliary valve body 3 from the outside of the valve box A is performed on the connecting flange portion 22B formed at the upper end of the bearing portion 22A. A reduction gear 15 that is detachably interlocked with the operation shaft 5A of the operation means 5 is attached in the vertical direction.

  As shown in FIG. 17, the operating means 5 is formed at both upper and lower ends of the auxiliary valve body 3 so as to pivotally support the auxiliary valve body 3 around the vertical axis Y with respect to the valve body 2. Among the rotation fulcrum shafts, the upper rotation fulcrum shaft 5B is integrally formed with the operation shaft 5A. On the upper surface of the speed reducer 15, a reduction gear mechanism is provided on the operation shaft 5A of the operation means 5. A rotating operation shaft 15A that interlocks with the projection is provided.

  As shown in FIGS. 5 to 7, the working housing C is configured such that the lower connecting flange portion 24 </ b> A of the valve case 24 of the working on-off valve B is connected to the bolt 27. A nut 28 is fixedly connected in a detachable manner in a sealed state, and a lower connection flange portion 25A of the lower work case 25 is connected to an upper connection flange portion 24B of the valve case 24 via a bolt 27 and a nut 28. It is fixedly connected so as to be removable in a sealed state.

  As shown in FIGS. 5 to 12, when the cutting work is performed, the perforation hole saw 4 can pass through the upper connection flange portion 25 </ b> B of the lower work case 25 at a corresponding one of the three perforation positions P <b> 1 to P <b> 3. Three types of perforating work lids 26 provided with a continuous tube portion 26A are fixedly connected in a sealed state so as to be removable in a sealed state via bolts 27 and nuts 28. The connection flange portion 26B of 26A includes a connection flange portion 29A of the connection case 29 of the cutting device E, and a discharge pipe of a chip discharger F that discharges chips (chips) to the outside using the water pressure of tap water. A chip discharge work lid 32 provided with a pipe support portion 31 for pivotally supporting and pivoting and sliding in the vertical direction in a watertight state is selectively sealed through bolts 27 and nuts 28. Detach in And it is fixedly connected to the capacity.

  15 and 16, the lower connection flange portion 33 </ b> A of the upper work case 33 is connected to the upper connection flange portion 25 </ b> B of the lower work case 25 via bolts 27 and nuts 28. The upper connecting flange portion 33B of the upper work case 33 is fixedly connected so as to be detachable in a sealed state. The connecting flange portion of the lid cover 36 that slidably supports the elevating cylinder shaft 35 of the elevating holding device G in the vertical direction. 36A is fixedly connected in a sealed state through bolts 27 and nuts 28 so as to be detachable.

  As shown in FIGS. 5 and 6, the cutting device E is driven by a driving part such as an electric motor or an engine with respect to rotation supported by the casing 40 and a driving rotary shaft 41 slidable in the drilling axis direction. By applying a driving rotational force and a feeding force, the hole saw 4 connected to the tip of the driving rotational shaft 41 is fed along the pipe radial direction through the opening / closing valve B that is opened, so that water is continuously generated. The cutting and removal planned pipe part 1A of the existing water pipe 1 is cut and removed in three parts with a cutting width smaller than the pipe diameter D in the state.

  The hole saw 4 is composed of a cylindrical body 4A provided with a cutting tip at the tip, and a center drill 4B extending from the center position of the inner bottom along the direction of the rotation axis. A plurality of retaining pieces 42 that can swing up and down are provided at each of two locations spaced apart in the direction of the rotational axis of 4B to prevent the section 1C that has entered the cylindrical body 4A from falling off.

  When drilling at the third drilling position P3 on the vertical line passing through the tube axis X, as shown in FIG. 12, a hole saw 4 in which the tip of the center drill 4B protrudes from the tip of the cylindrical body 4A is used. In addition, the first perforation position P1 displaced to one side in the transverse direction with respect to the vertical line passing through the tube axis X or the second displaced to the other side in the transverse direction with respect to the vertical line passing through the tube axis X. When drilling at the drilling position P2, as shown in FIGS. 6 and 9, a hole saw 4 in which the tip of the center drill 4B enters inward from the tip of the cylindrical body 4A is used.

  Furthermore, in each of the parts corresponding to the first drilling position P1 and the second drilling position P2 on the outer peripheral surface of the pipe portion 1A to be cut and removed of the existing water pipe 1, there is a through hole 43a through which the center drill 4B can pass. The locking member 43 is fixed by appropriate fixing means such as bolts 44 or welding, and when the hole saw 4 is lifted after drilling, the retaining piece 42 of the center drill 4B is placed on the periphery of the through hole 43a on the inner surface side of the locking member 43. By engaging, the section 1 </ b> C is collected through the locking member 43.

  As shown in FIGS. 15 and 16, a connecting portion fixedly connected to the lower end portion of the elevating cylinder shaft 35 of the elevating / holding device G in a state where it can be suspended from the lid portion 2 </ b> A of the valve body 2. 46 is provided, and each of the front and back surfaces of the auxiliary valve body 3 assembled to the valve body 2 is formed as a curved surface from which the tube axis X side of the existing water pipe 1 protrudes most.

Next, a method for cutting and removing the existing water pipe 1 using the valve installation equipment configured as described above and a valve installation method will be described.
As shown in FIG. 1 and FIG. 2, a work pit P is formed by excavating a work area including a valve installation location of the existing water pipe 1 buried in the ground, and a reinforcing bar containing a reinforcing bar is formed at the bottom of the work pit P. While constructing the base concrete 50, the lower case 6 of the valve box A is inserted through a gap between the pipe portion 1 </ b> A of the existing water pipe 1 to be cut and removed and the upper surface of the base concrete 50, and placed at a predetermined position on the base concrete 50. It is installed on a plurality of provisional cradle 51 placed.

  In addition, on the outer peripheral surface of the pipe portion 1A to be cut and removed from the existing water pipe 1, a portion corresponding to the first drilling position P1 that is displaced to one side in the transverse direction with respect to the vertical line passing through the tube axis X, and Locking having a through hole 43a through which the center drill 4B of the hole saw 4 can pass in each of the portions corresponding to the second drilling position P2 displaced to the other side in the transverse direction with respect to the vertical line passing through the tube axis X The member 43 is fixed with a bolt 44 or the like.

  As shown in FIGS. 3 to 5, the connecting flange portion 6 </ b> B of the lower case 6 and the connecting flange portion 7 </ b> D of the upper case 7 are temporarily fixedly connected with bolts 27 and nuts 28 in a sealed state. The connecting flange portions 6B and 7D are integrated by welding at the time of mounting to the existing water pipe 1 on the split joint surface on the virtual horizontal plane passing through the tube axis X of the existing water pipe 1, and both the integrated cases 6 and 7, the ends of both cylindrical case parts 6 </ b> A and 7 </ b> C that are fitted and held on the outer peripheral surface of the existing water pipe 1 are between the tapered inner peripheral surface and the outer peripheral surface of the existing water pipe 1. After tightening and fixing the two-piece push ring 11 that compresses the elastic sealing material interposed in the tube axis X direction into the sealed state, both cuts are made after cutting and removal of the existing water pipe 1 to be cut and removed 1A In order to maintain the remaining pipe portion 1B in a concentric state, Building a protective concrete 52 rebar containing so as to cover the end portion side portion and both cut leaving tube section 1B.

  As shown in FIGS. 4 and 5, the valve case 24 of the work on / off valve B, which is a component of the work housing C, the lower work case 25, and the tube axis X are passed through the connecting flange portion 7 </ b> A of the upper case 7. The drilling work lid 26 provided with the connecting cylinder part 26A is fixedly connected in a sealed state to the first drilling position P1 that is displaced to one side in the transverse direction with respect to the vertical line, and the connecting cylinder part of the drilling work lid 26 is also connected. The connecting flange portion 29A of the connecting case 29 of the cutting device E is fixedly connected to the connecting flange portion 26B of 26A through a bolt 27 and a nut 28 in a sealed state.

Next, as shown in FIGS. 5 and 6, the driving portion of the cutting device E is driven to apply the driving rotational force and the feeding force to the driving rotational shaft 41 supported by the casing 40. The hole saw 4 connected to the tip of the rotating shaft 41 is sent along the pipe radial direction through the opening / closing valve B for opening operation, and as shown in FIG. In 1A, a pipe portion that is displaced to one side in the transverse direction with respect to a vertical line passing through the pipe axis X is cut into a cylindrical shape centered on the first drilling position P1.

  Then, as shown in FIG. 8, in the state where the cut and removal planned pipe portion 1A of the existing water pipe 1 is cut into a cylindrical shape around the first drilling position P1, one side in the transverse direction of the drilling opens, and the opening dimension is In addition to the minimum cutting width W1, the center inner dimension (cutting diameter of the cylindrical body 4A) in the tube axis X direction passing through the first drilling position P1 of the drilling becomes the maximum cutting width W2.

  At the time of this cutting operation, both drain valves 18 are opened, and chips (chips) generated by the cutting action of the cutting apparatus E by the hole saw 4 are placed below the planned cutting position of the existing water pipe 1. Since each drainage port 16 provided can be discharged to the outside, the outflow of chips and the like to the downstream side and the accumulation on the valve seat 19 can be satisfactorily suppressed.

  Further, the retaining piece 42 provided on the center drill 4B of the hole saw 4 passes through the through hole 43a of the locking member 43 fixed to the cutting / removal scheduled pipe portion 1A of the existing water pipe 1 with a bolt 44 or the like, and Because of the locking posture that protrudes radially outward by the rotational force, the retaining piece 42 of the center drill 4B engages with the periphery of the through hole 43a on the inner surface side of the locking member 43 when the hole saw 4 is raised. The section 1C that has entered the cylindrical body 4A of the hole saw 4 can also be collected together.

  As shown in FIG. 7, after removing the connection case 29 of the cutting device E from the connection flange portion 26 </ b> B of the drilling work lid 26, the discharge pipe 30 of the chip discharging tool F is connected to the connection flange portion 26 </ b> B of the drilling work lid 26. After the chip discharge work lid 32 is fixedly connected in a sealed state via bolts 27 and nuts 28, the open / close valve provided at the hand of the discharge pipe 30 is supported. 34 is opened, and the tip of the discharge pipe 30 is moved along the inner bottom wall surface of the valve box A in this state, so that the remaining chips generated during cutting scattered on the inner bottom wall surface of the valve box A can be removed. Discharge outside with tap water.

  Next, as shown in FIG. 9, after removing the drilling work lid 26 to which the chip discharging tool F is attached from the upper connection flange portion 25 </ b> B of the lower work case 25, the upper connection flange portion 25 </ b> B of the lower work case 25. In addition, a drilling work lid 26 provided with a connecting cylinder portion 26A is fixedly connected in a sealed state to a second drilling position P2 displaced to the other side in the transverse direction with respect to a vertical line passing through the tube axis X, and this drilling is performed. The connection flange portion 29A of the connection case 29 of the cutting device E is fixedly connected to the connection flange portion 26B of the connection cylinder portion 26A of the work lid 26 through a bolt 27 and a nut 28 in a sealed state.

  Next, the driving portion of the cutting device E is driven, and a driving rotational force and a feeding force are applied to the driving rotational shaft 41 supported by the casing 40, so that the driving rotational shaft 41 is connected to the distal end portion. The hole saw 4 is fed along the pipe radial direction through the opening / closing valve B for opening operation, and passes through the pipe axis X in the pipe portion 1A to be cut and removed of the existing water pipe 1 as shown in FIG. The tube portion that is displaced to the other side in the transverse direction with respect to the vertical line is cut into a cylindrical shape centered on the second drilling position P2.

  Then, as shown in FIG. 11, in the state where the cut and removal planned pipe portion 1A of the existing water pipe 1 is cut into a cylindrical shape around the second drilling position P2, the other side in the transverse direction of the drilling opens, and the opening dimension is In addition to the minimum cutting width W1, the inner center dimension (cutting diameter of the cylindrical body 4A) in the tube axis X direction passing through the second drilling position P2 of the drilling becomes the maximum cutting width W2.

  Even at the time of this cutting operation, both drain valves 18 are opened and chips (chips) generated by the cutting action of the cutting apparatus E by the hole saw 4 are removed below the planned cutting position of the existing water pipe 1. It discharges to the outside from each drain port 16 provided at the position.

  As shown in FIG. 10, after removing the connection case 29 of the cutting device E from the connection flange portion 26 </ b> B of the drilling work lid 26, the discharge pipe of the chip discharging tool F is connected to the connection flange portion 26 </ b> B of the drilling work lid 26. After the chip discharge work lid 32 that penetrates and supports the screw 30 so as to be pivotable and slidable in the vertical direction is fixedly connected in a sealed state via bolts 27 and nuts 28, the opening and closing provided at the hand of the discharge pipe 30 By opening the valve 34 and moving the tip of the discharge pipe 30 along the inner bottom wall surface of the valve box A in this state, the remainder of chips generated during cutting scattered on the inner bottom wall surface of the valve box A Is discharged together with tap water.

  As shown in FIG. 12, after removing the drilling work lid 26 on which the chip discharging tool F is mounted from the upper connection flange portion 25B of the lower work case 25, the upper connection flange portion 25B of the lower work case 25 is The connecting flange portion 26C of the drilling work lid 26 provided with the connecting cylinder portion 26A is fixedly connected to the third drilling position P3 on the vertical line passing through the tube axis X through a bolt 27 and a nut 28 in a sealed state. The connection flange portion 29A of the connection case 29 of the cutting device E is fixedly connected to the connection flange portion 26B of the connection cylinder portion 26A of the work lid 26 through a bolt 27 and a nut 28 in a sealed state.

  Next, the driving portion of the cutting device E is driven, and a driving rotational force and a feeding force are applied to the driving rotational shaft 41 supported by the casing 40, so that the driving rotational shaft 41 is connected to the distal end portion. The hole saw 4 is fed along the pipe diameter direction through the opening / closing valve B for opening operation, and passes through the tube axis X in the pipe portion 1A to be cut and removed of the existing water pipe 1 as shown in FIG. The pipe portion on the vertical line is cut into a cylindrical shape centered on the third drilling position P3 in a state where it overlaps with the two previously drilled holes.

  Then, as shown in FIG. 13, in the state where the cut and removal planned pipe portion 1A of the existing water pipe 1 is cut into a cylindrical shape around the third drilling position P3, the three drillings communicate in the transverse direction and are cut and separated. Among the opposing spacings of the cut end surfaces 1b of the two cut residual pipe portions 1B, the opening dimension on both sides in the transverse direction and the communicating place of the drilling are the minimum cutting width W1, and pass through the first to third drilling positions P1 to P3. Each center inner dimension (cut diameter of the cylindrical body 4A) in the tube axis X direction becomes the maximum cut width W2.

  Even at the time of this cutting operation, both drain valves 18 are opened and chips (chips) generated by the cutting action of the cutting apparatus E by the hole saw 4 are removed below the planned cutting position of the existing water pipe 1. It discharges to the outside from each drain port 16 provided at the position.

  Further, when the center drill 4B of the hole saw 4 has penetrated and penetrated the tube wall portion of the pipe portion 1A to be cut and removed, the retaining piece 42 provided in the penetration portion of the center drill 4B is rotated in the radial direction by the rotational force. Since it is in the locking posture that protrudes outward, when the hole saw 4 is raised, the retaining piece 42 of the center drill 4B engages with the periphery of the through hole of the section 1C and enters the cylindrical body 4A of the hole saw 4. Section 1C can also be collected together.

  Next, as shown in FIG. 15, after removing the drilling work lid 26 provided with the cutting device E from the upper connection flange portion 25 </ b> B of the lower work case 25, the lifting cylinder shaft 35 of the lifting and holding device G is used as the lid cover 36. The connecting portion 46 of the elevating cylinder shaft 35 and the valve body 2 are fixedly connected to each other, and the upper connecting flange portion 33B of the upper work case 33 is sealed to the connecting flange portion 36A of the lid cover 36 in a sealed state. After the fixed connection with the nut 28, the assembly is lifted by a lifting means such as a crane, and the lower connection flange portion 33A of the upper work case 33 is sealed to the upper connection flange portion 25B of the lower work case 25 with a bolt 27 and a nut. At 28, it is fixedly connected.

  The work opening / closing valve B is opened, the lifting cylinder shaft 35 of the lifting / holding device G is lowered by the lifting means such as a crane with respect to the lid cover 36 of the working housing C, and the valve body 2 is moved to the work opening / closing valve B and After inserting the valve body A through the valve body insertion port 8 to the predetermined valve body mounting position without touching the cut end face 1b of the two cutting residual pipe portions 1B, the upper surface of the cover cover 36 and the upper end of the lifting cylinder shaft 35 are inserted. A hydraulic pressurizing tool 53 that moves the lifting and lowering cylinder shaft 35 downward is provided between the first and third elastic members, and the first to third elasticity of the valve body 2 via the lifting and lowering cylinder shaft 35 by the hydraulic pressurizing tool 53. The sealing materials 2D, 2E, and 2F are brought into pressure contact with the first to third valve seats 19A, 19B, and 19C constituting the valve seat 19 of the valve box A, and the flow path is blocked at the location where the existing water pipe 1 is cut and removed.

  As shown in FIGS. 16 and 17, when the presser bolts 21 that are screwed and attached to a plurality of locations in the circumferential direction of the connecting cylindrical part 7 </ b> B of the upper case 7 are tightened radially inward, The tapered pressing surface 21a formed on the distal end side comes into contact with the tapered surface 2a formed on the upper corner portion of the lid portion 2A of the valve body 2 from the horizontal direction, and the first to third of the valve body 2 The elastic sealing materials 2D, 2E, and 2F are secured in a sealed state in pressure contact with the first to third valve seats 19A, 19B, and 19C of the valve box A.

  Next, as shown in FIGS. 17 and 18, the fixed connection between the connection flange portion 7 </ b> A of the upper case 7 and the lower connection flange portion 24 </ b> A of the valve case 24 of the work on / off valve B is released, and the work housing C and the lifting / lowering holding device G are removed from the valve box A, and a valve lid 22 for sealing the valve body insertion port 8 of the valve box A is fixed to the connecting flange portion 7A of the upper case 7 with bolts 27 and nuts 28. Further, a connecting flange 22B formed at the upper end of the bearing 22A of the valve lid 22 is connected to the operating shaft 5A of the operating means 5 for opening and closing the auxiliary valve body 3 from the outside of the valve box A. Attach the reducer 15 that is detachably linked to the unit.

  Further, not only can the flow rate be reliably and easily adjusted by opening / closing the auxiliary valve body 3 while the valve body 2 is maintained in the flow path shutoff posture, but the auxiliary valve body 3 has the same inner diameter as the existing water pipe 1. Even if it is configured to have a diameter or a slightly larger diameter, the internal space on the side of the cutting opening 1a in each cutting residual pipe portion 1B can be sufficiently utilized as an operating space for rotating and opening the auxiliary valve body 3. Even under conditions where the minimum gap (cutting width W) between the cut end faces 1b of both cut residual pipe portions 1B is considerably smaller than the pipe diameter D, the flow rate can be reliably and easily adjusted in a compact and efficient manner. In addition, the flow resistance when the auxiliary valve body 3 is in the maximum opening operation position can be reduced.

  Further, when the valve body 2 is inserted from the valve body insertion port 8 of the valve box A through the cut end face 1b of the both cutting residual pipe portions 1B, the auxiliary valve body 3 provided in the valve body 2 is removed from the both cutting residuals. The flow resistance when the valve body 2 is inserted can be reduced by performing the opening operation within a range where the cut end surface 1b of the placement tube portion 1B is not touched.

[Second Embodiment]
In the above-described first embodiment, the swinging and swinging that prevents the section 1C that has entered the cylindrical body 4A from falling off at each of two locations spaced apart in the direction of the axis of rotation of the center drill 4B of the hole saw 4 is freely swingable. A plurality of retaining pieces 42 are pivotally mounted, but as shown in FIG. 19 (a), a plurality of locking pieces are pivotally connected in a recess 4b formed in the center drill 4B. The lower end portion of the chain-like locking body 55 such as a chain is pivotally attached, and can be protruded radially outward in accordance with the rotation of the center drill 4B. You may comprise so that it may store in the recessed part 4b at the time of passage to a through-hole.

Then, as shown in FIGS. 19B and 19C, in a state where the center drill 4B of the hole saw 4 has pierced and penetrated the tube wall portion of the pipe portion 1A to be cut and removed, the penetration portion of the center drill 4B Since the cord-like latching body 55 provided on the center drill 4B is in the latching posture that protrudes radially outward by the rotational force, the cord-like latching body 55 of the center drill 4B penetrates the section 1C when the hole saw 4 is lifted. It is possible to collect the section 1C that has entered the cylindrical body 4A of the hole saw 4 by engaging with the peripheral edge of the hole.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
In the first embodiment described above, as shown in FIG. 20, some tap water (liquid) is generated in the cylindrical recess 6 </ b> D of the lower case 6 along with cuttings (chips) generated by the cutting action by the cutting device E. And a drain pipe 58 with an on-off valve 57 that discharges to the outside.

In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
In the third embodiment, the cylindrical recess 6D of the lower case 6 may be configured to have a width substantially equal to the inner dimension in the transverse direction of the valve box A.

[Fourth Embodiment]
In the above-described first embodiment, the hole saw 4 configured to have a drilling diameter smaller than the outer diameter of the existing water pipe 1 is drilled and moved downward at three positions in the transverse direction of the pipe section 1A to be cut and removed. Although it was configured to cut and remove the pipe portion 1A to be cut and removed from the existing water pipe 1 in three parts with a cutting width smaller than the pipe diameter D in the undisrupted water state, FIGS. As shown in FIG. 3, the hole saw 4 configured to have a perforation diameter larger than the outer diameter of the existing water pipe 1 is perforated and moved downward while being fed downward at the central position in the transverse direction of the cut-and-removed planned pipe portion 1A, thereby providing a continuous water state. The cutting and removal planned pipe portion 1A of the existing water pipe 1 may be cut and removed in one step.

  Moreover, in this 4th Embodiment, as shown in FIG.21, FIG.22, in the inner wall surface of the valve box A of a two-part structure, in the back | inner side site | part which opposes the valve body insertion port 8 in radial direction, An inclined inner wall surface 6f positioned on the other end side in the valve insertion direction is formed so as to approach the center line Z side passing through the central position in the tube axis X direction of the valve body 2 and is relatively relative to the flow path crossing direction of the valve box A. A first valve seat 19A is formed on the side wall inner surface 6d facing the first elastic seal member 2D, which is pressed in a sealed state, on both side surfaces of the valve body portion 2B of the valve body 2 facing this. And a second elastic seal member 2E provided on the outer peripheral surface of the lid portion 2A of the valve body 2 is pressed against the inner peripheral wall surface 6e facing the valve body insertion port 8 of the valve box A in a sealed state. A seat 19B is formed in a state of being continuous with the first valve seat 19A, and the valve body portion 2B is inserted into the inclined inner wall surface 6f. A third valve seat 19C to which a third elastic sealing material 2F provided on the lower outer surface 2b of the flange 2C integrally formed in a T-shape with respect to the lower end which is the other end in the direction is pressed in a sealed state; The first valve seat 19A is formed in a continuous state, and the first valve seat 19A, the second valve seat 19B, and the third valve seat 19C constitute a valve seat 19 for the valve body 2.

  Then, the valve body 2 is inserted from the valve body insertion port 8 of the valve box A through the cut end face 1b of both of the remaining cutting pipes 1B to shut off the flow path of the existing water pipe 1, and at the same time, the valve body of the valve box A is inserted. When sealing the port 8, the first elastic seal material 2D provided on both side surfaces of the valve body portion 2B of the inserted valve body 2 is a first valve seat 19A formed on the side wall inner surface 6d of the valve box A. The inner peripheral wall faced to the valve body insertion port 8 in a state where the second elastic sealing material 2E of the lid portion 2A formed at one end of the valve body 2 in the insertion direction is continuous with the first valve seat 19A. The third elastic sealing material 2F of the flange 2C formed on the other end in the insertion direction of the valve body 2 is pressed against the second valve seat 19B formed on 6e, and the inner wall surface of the valve box A is The valve body insertion port 8 is in pressure contact with the third valve seat 19C of the inclined inner wall surface 6f opposed to each other in the vertical direction.

  Therefore, not only the frictional force between the first to third valve seats 19A, 19B, 19C and the first to third elastic sealing materials 2D, 2E, 2F, but also the second through the second elastic sealing material 2E. Engagement of the valve seat 19B and the lid portion 2A in the tube axis X direction, and engagement of the third valve seat 19C and the flange portion 2C in the tube axis X direction via the third seal material 2F. Therefore, it is possible to suppress the valve body 2 in the flow path blocking posture from being bent and deformed by the fluid pressure.

The valve body 2 has a deformed hexagonal shape in which both sides of the lower side are chamfered with the same gradient as the inclined inner wall surface 6f when viewed in the tube axis direction, and the upper side is larger than the lower side. A valve body 2B formed in a tapered shape, a circular lid 2A having the upper side length of the valve body 2B as a diameter, and a circular collar portion having a lower side length as the diameter 2C is integrally formed in a substantially I-shape when viewed in the direction crossing the flow path, and the protrusion margin in the tube axis X direction of the flange portion 2C is the protrusion in the tube axis X direction of the lid portion 2A. The size is smaller than the size and can be inserted without touching the cut end surfaces 1b of the two cut residual pipe portions 1B, that is, the minimum facing distance between the cut end surfaces 1b of the two cut residual pipe portions 1B. also it is configured in a small, further, the lower outer surface 2b of the flange portion 2C is configured in the inclined surfaces having the same slope as the inclined inner wall surface 6f In addition, as shown in FIGS. 21 to 23, the protrusion margin in the tube axis direction of the lid portion 2A with respect to the one end portion in the valve insertion direction of the valve body 2 is between the cut end surfaces 1b of both cut residual pipe portions 1B. It is configured to be larger than the maximum cutting width at .

  Further, as shown in FIGS. 22 to 24, there are two outer peripheral edges of the annular space regulating member 61 fixed to the upper surface of the lid portion 2 </ b> A of the valve body 2 and displaced 180 degrees in the circumferential direction. The valve body 2 is engaged with the positioning recess 60 formed in the periphery of the opening of the valve body insertion port 8 of the valve box A from above and below so as to keep the valve body 2 in a non-rotatable state in the flow path blocking posture. A convex portion 61a is formed.

  Further, in the first embodiment described above, the hydraulic pressurizer 53 that moves the lifting cylinder shaft 35 downward is provided between the upper surface of the lid cover 36 and the upper end portion of the lifting cylinder shaft 35. 22, a screw-type pressurizing tool 65 including a bolt 63 and a nut 64 is provided between the upper surface of the lid cover 36 and the upper end portion of the lifting cylinder shaft 35 to move the lifting cylinder shaft 35 downward. The first to third valves constituting the valve seat 19 of the valve box A with the first and third elastic seal members 2D, 2E, 2F of the valve body 2 through the lifting cylinder shaft 35 by the screw type pressurizing tool 65. You may comprise so that it may be press-contacted to seat 19A, 19B, 19C, and a flow path may be interrupted | blocked in the cutting removal location of the existing water pipe 1. FIG.

Further, in the inclined inner wall surface 6f of the valve box A, chips can be discharged to the outside together with a part of the fluid in the pipe at a part of the flange 2C that is blocked from the pipe flow path by the third sealing material 2F. When the third sealing material 2F of the flange portion 2C of the valve body 2 is pressed against the third valve seat 19C of the valve box A, the valve insertion direction of the flange portion 2C, etc. A gap S in which chips can be accumulated is formed between the opposing surfaces of the end-side surface, that is, the lower outer surface 2b and the inclined inner wall surface 6f of the valve box A.

A connecting flange portion 68A of a drain pipe 68 provided with an opening / closing valve 67 is detachably fixedly connected to the peripheral edge portion of the drain port 66 on the bottom wall surface of the valve box A, and the drain pipe 68 is connected. 23, the valve body 2 extends from the outside of the valve box A through the drainage port 66 over the bottom of the valve box A and the portion of the valve body 2 facing the drainage port 66, as shown in FIG. Is fixed to the other end side in the valve insertion direction.

The fixing means 69 includes a bush 69A that is inserted into the drainage port 66 from below, and a drawing bolt 69B that is screwed into the flange 2C of the valve body 2 through the bush 69A.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In the above-described first embodiment, the hole saw 4 is used as the cutting tool 4 of the cutting device E. However, instead of this, a cutting tool, a disc-shaped cutting tool, or an end meal is used, and both cuttings are left. By moving the pipe portion 1B in the radial direction along the pipe circumferential direction at the planned cutting position to be the end face of the pipe portion 1B, the pipe portion 1A to be cut and removed from the existing water pipe 1 is cut and removed in a ring shape in an undisturbed state of water. You may comprise.
(2) In each of the embodiments described above, the valve box A is divided into two in the pipe circumferential direction, but may be divided into three or more in the pipe circumferential direction.
(3) In the first embodiment described above, a portion of the valve body 2 that is concentrically opposed to the cutting opening 1a of both of the remaining cutting tubes 1B is along the radial direction passing through the tube axis X. Although the auxiliary valve body 3 that can be rotated and opened around the vertical axis Y is assembled, the auxiliary valve body 3 may be assembled to the valve body 2 in a state that can be opened and closed in the vertical direction.
Further, in the first embodiment described above, the auxiliary valve body 3 is configured to have the same or substantially the same outer diameter as the inner diameter of the existing water pipe 1, but the auxiliary valve body 3 is smaller than the inner diameter of the existing water pipe 1. It may be configured and implemented.
Furthermore, you may implement using the valve body 2 in which such an auxiliary valve body 3 is not provided.

  (4) In the first embodiment described above, the two cases 6 and 7 constituting the valve box A are attached to the existing water pipe 1 on the split mating surface on the virtual horizontal plane passing through the tube axis X of the existing water pipe 1. Although sometimes configured to be integrated by welding, the two cases 6 and 7 may be configured to be flange-joined.

  (5) In the first embodiment described above, the upper case 7 is provided with the valve body insertion port 8 and the connecting flange portion 7A that allow the hole saw 4 and the valve body 2 of the cutting device E to be inserted and removed from the vertical direction. The cylindrical connecting cylindrical portion 7B is integrally formed, and the second valve seat 19B is formed on the inner peripheral wall surface of the connecting cylindrical portion 7B facing the valve element insertion port 8, but the valve is inserted more than the valve element insertion port 8. You may form the 2nd valve seat 19B in the state which follows the 1st valve seat 19A in the opening peripheral side of a direction one end side (upper side).

Sectional front view when the lower case is inserted below the cutting and removal planned pipe portion according to the first embodiment of the existing pipe cutting and removing method and valve installation method of the present invention Cross-sectional front view when the lower case is inserted below the pipe to be cut and removed Sectional side view when the upper case is fixedly connected to the lower case Cross-sectional side view with work on / off valve installed Sectional front view when the cutting device is attached to the first drilling position Sectional front view showing the state of drilling at the first drilling position Sectional front view showing chip discharge operation at the first drilling position Sectional plan view when the drilling process at the first drilling position is completed. Cross-sectional front view showing the state of drilling at the second drilling position Sectional front view showing chip discharge operation at the second drilling position Cross-sectional plan view when the drilling process at the second drilling position is completed Cross-sectional front view showing a drilled state at the third drilling position Sectional plan view when the drilling process at the third drilling position is completed Perspective view of valve body Sectional front view when the valve body located in the upper space of the working housing is lowered to the lower space Sectional side view when the housing is removed and the lid is attached Sectional front view when the work housing is removed and the lid is attached Cross-sectional side view with reducer installed A second embodiment of a method for cutting and removing an existing pipe and a valve installation method is shown. (A) is a partially cutaway front view of a hole saw before starting the cutting operation (b) is a partially cutaway hole saw at the end of the cutting operation. Front view (c) is a partially cutaway front view of the hole saw when ascending. Sectional front view of the third embodiment of the existing pipe cutting and removing method and valve installation method, with the working housing removed and the lid attached Cross-sectional side view at the time of cutting work showing a fourth embodiment of a method for cutting and removing an existing pipe and a valve installation method Sectional front view when the valve body located in the upper space of the working housing is lowered to the lower space Sectional side view when the housing is removed and the lid is attached Enlarged plan view of the main part

Explanation of symbols

A Valve box S Air gap 1 Existing pipe (existing water pipe)
1A Cutting / removing tube (cutting / removal planned tube)
1B Cutting and leaving pipe (cutting and leaving planned pipe)
DESCRIPTION OF SYMBOLS 1a Cutting opening 1b Cutting end surface 2 Valve body 2A Lid part 2B Valve body part 2C Ridge part 2D 1st sealing material (1st elastic sealing material)
2E Second sealing material (second elastic sealing material)
2F 3rd sealing material (3rd elastic sealing material)
2b Lower outer surface 3 Auxiliary valve body 6e Inner peripheral wall surface 6f Inclined inner wall surface 6g Bottom wall inner surface 7b Inner peripheral wall surface 16 Intake port (intake port)
19 Valve seat 19A 1st valve seat 19B 2nd valve seat 19C 3rd valve seat 66 Intake port (intake port)
69 Fixing means

Claims (2)

The cut and removed portions of the existing pipe are cut and removed, and the cut and removed portions are enclosed in a sealed state, and are opened in a radial direction at a portion corresponding to the cut end surfaces of both of the cut and left pipe portions. A split valve box having a valve body insertion port is mounted, and the first valve formed on the inner wall surface of the valve box from the valve body insertion port of this valve box through the cut end surfaces of both cutting residual pipe portions A valve body having a first seal material that can be pressed against the seat is inserted from the radial direction, and a valve body insertion port is provided at one end of the valve body in the valve insertion direction so as to be continuous with the first valve seat. A valve installation facility for an existing pipe in which a lid portion provided with a second sealing material capable of being pressed against a second valve seat formed on the inner peripheral wall surface facing the opening or the opening peripheral edge of the valve body insertion port is formed,
Of the inner wall surface of the valve box, the inner side wall surface in the radial direction opposite to the valve body insertion port, the center passing through the center position in the tube axis direction of the tubular inner circumferential wall surface along the valve insertion direction or the valve body An inclined inner wall surface located on the other end side in the valve insertion direction is formed closer to the line side, and an inner peripheral wall surface in a state continuous with the first valve seat at the other end portion in the valve insertion direction of the valve body Alternatively, a flange provided with a third sealing material that can be pressed against a third valve seat formed on the inclined inner wall surface is formed , and further, the inner wall of the bottom wall or the inclined inner wall surface of the valve box, 3 A drainage port through which chips can be discharged to the outside together with a part of the fluid in the pipe is formed at a portion that is blocked from the pipe flow path by the sealing material, and the bottom of the valve box and the drainage of the valve body A fixing means is provided for pulling and fixing the valve body to the other end side in the valve insertion direction through the drainage port over the portion facing the mouth. Valve installed equipment that the existing pipe. The protruding margin in the tube axis direction of the lid portion with respect to one end portion in the valve insertion direction of the valve body is configured to be larger than the maximum cutting width between the cutting end surfaces of both cutting residual pipe portions, and the valve The protrusion margin in the tube axis direction of the collar portion with respect to the other end portion in the valve insertion direction of the body is configured to be smaller than the minimum cut width between the cut end surfaces of both cut remaining pipe portions . Existing pipe valve installation equipment.

Images