JP2006112567A - Valve installation method for existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely and easily install a valve under such a condition that the length of a part of an existing pipe to be cut and removed is smaller than the diameter thereof, while making it possible to improve the efficiency of removing operation and to realize the laborsaving after installation of the valve, and further to make compact the whole of the valve structure after the installation and improve the reliability of the liquid leakage surface while providing fixture elements for preventing co-rotation of a cutting device. <P>SOLUTION: A cutting operation area of the existing pipe 1 containing the cutting device E is sealed by a case A and an operation housing C equipped with an opening/closing valve B for operation. A guide support E2 of the cutting device E is pressed and fixed at a plurality of positions thereof in the circumferential direction by a plurality of fixture elements J provided on the operation housing C so as not to rotate relatively. Under the above condition, the portion 1A of the existing pipe 1 to be cut and removed is cut by the cutting device E. The pressing and fixing by the fixture elements J provided on the operation housing C is released, and the cutting device E is extracted together with the cut and removed pipe portion 1A to the outside. A valve element is brought into press-contact with and secured to a valve seat 20 formed on an inner wall surface of the case A through a gap defined between cut end faces 1b of the remaining pipe portions 1B of the cut existing pipe 1, to thereby shut off the flow path of the existing pipe 1. Thereafter, the operation housing C including the opening/closing valve B for operation and the fixture elements J is removed from the case A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a valve installation method that is useful when a new valve is installed in the middle of an existing pipe in a continuous flow (non-continuous water) state while maintaining the flow of fluid in the pipe, or when an old valve is replaced with a new valve. .

Various methods have been proposed as valve installation methods for existing pipes, and typical methods are as follows (1) and (2).
(1) The existing pipe is provided with a working housing that seals a region slightly wider than the planned cutting position, and the existing pipe that is sealed by the working housing is cut and removed with a circumferential wall around the pipe. A pair of cutting units provided with a cutting tool that is a cutting tool for cutting along the direction, a guide support unit that rotatably supports the cutting unit around the tube axis, and a drive unit that drives and rotates the cutting unit The work housing is provided with a plurality of fixtures for pressing and fixing a plurality of circumferential locations of the guide support of the cutting device from the radially outer side.

  Further, both the connection pipe parts of the new valve corresponding to the cutting and removing pipe part and the both cutting residual pipe parts are connected in a concentric state to the both cutting and leaving planned pipe parts of the existing pipe remaining in the working housing. And a lifting / lowering holding device for holding and lifting the cutting / removing pipe portion and holding the replacement new valve in the working housing, and raising the same A work on / off valve that shuts the work housing into an upper space and a lower space is assembled between the position and the lowered position.

  Then, the cutting tool of each cutting unit is fed inwardly in the radial direction of the pipe while rotating both cutting units of the cutting device around the pipe axis, so that the existing pipe is maintained in an unbroken state while maintaining the flow of the fluid in the pipe. After cutting the part to be cut and removed into a circular shape, the fixing by pressing with the fixing tool is released, that is, the upper fixing tool that protrudes into the rising path of the cutting device including the cut and removed pipe part that has been cut. Unfixing operation to the outside, the cutting and removing pipe part is lifted into the upper space of the working housing by the lifting and holding device together with the cutting device, and the working on-off valve is closed and the cutting held by the lifting and holding device The removal pipe part and the cutting device are taken out, and a new valve is attached to the lifting and holding device.

  Next, the work on / off valve is opened and the new valve held by the lifting / lowering holding device is lowered into the lower space of the work housing. Keep the concentric state opposite to the part, and slide the joint unit held in the both cutting residual pipe parts to the new valve side in this state, so that both the cutting residual pipe part and the new valve After connecting and connecting the connecting pipe portion in a concentric state, the lifting / lowering holding device and the working housing are removed (for example, see Patent Documents 1 and 2).

  (2) A case with an upward opening having a valve box function of a split structure that seals a region slightly wider than the planned cutting portion is attached to an existing pipe, and the valve body insertion opening portion that is the upper opening portion of this case is attached In addition, a work housing having an upper space in which the cutting / removing tube portion and the valve body can be alternatively stored, and a work on / off valve that shuts off the upper space and the lower space on the valve box side is mounted, In the upper part of the working housing, a hole saw with a cutting diameter larger than the pipe diameter of the existing pipe, and a feeding part for feeding this hole saw from the upper space in the working housing to the existing pipe cutting completion position in the valve box, A cutting device having a drive unit for driving and rotating the hole saw is assembled.

  Then, while the work on / off valve is open, the hole saw of the cutting device is driven to rotate and sent into the case, so that the existing pipe can be cut and removed in an undisturbed state while maintaining the flow of fluid in the pipe. In this state, the tube is cut into a cylindrical shape from the top and bottom, and then the cut and removed pipe portion is lifted into the upper space of the work housing while being held in the hole saw, and the work on-off valve is closed again for cutting. The device is removed from the top of the working housing along with the cutting and removal tube.

  Next, the lifting / lowering holding device attached to the upper part of the working housing has a disc-shaped lid portion that seals the valve body insertion port of the valve box and a valve body that is pressed against the valve seat formed on the inner wall surface of the valve box. After holding the valve body consisting of the part, open the operation on-off valve and lower the valve body part of the valve body held by the lifting and lowering holding device without touching the cut end face of the remaining cutting pipe part Then, the flow path of the existing pipe is blocked by the pressure contact between the valve body and the valve seat of the valve box.

  After that, with the bolts provided at multiple locations in the circumferential direction of the valve body insertion port of the valve box, the valve body is secured to the valve box in a pressed state, and then the valve lid is sealed at the valve body insertion port of the valve box (See Patent Document 3).

Japanese Patent Laid-Open No. 55-44167 Japanese Utility Model Publication No. 53-35491 Japanese Patent Laid-Open No. 5-280855

  In the conventional valve installation method according to (1), it is possible to easily cope with the change in the length of the cut and remove pipe portion of the existing pipe by adjusting the distance between the two cutting units constituting the cutting apparatus in the tube axis direction. However, both the connection pipe parts of the new valve corresponding to the cutting and removal pipe part and the cutting residual pipe part are connected in a concentric state to the planned cutting and leaving pipe parts of the existing pipe remaining in the working housing. Because it is necessary to assemble a joint unit that can be slidably operated, the working housing becomes larger in the direction of the pipe axis by the space required to assemble both joint units, and the working housing covers the entire newly installed valve. Therefore, it took time and effort to remove the valve after it was installed.

  Also, in the conventional valve installation method according to (2), a split structure case that seals an area slightly wider than the planned cutting position is attached to an existing pipe, and the valve body insertion port portion of this case is used for work. In order to mount the work housing with the on-off valve, in other words, the case of the valve to be installed is also used as a part of the work housing, so the removal work after the valve installation can be done with less labor In order to cut into a cylindrical shape from the vertical direction in a state where the planned cutting and removal of the existing pipe is divided, it is necessary to use a hole saw having a cutting diameter larger than the pipe diameter of the existing pipe. The flow resistance increases due to the rushing movement, and when the length of the cutting and removing pipe portion of the existing pipe is shorter than the pipe diameter, the construction cannot be performed and the application range is naturally limited.

  The present invention has been made in view of the above-mentioned actual situation, and the main problem is that the length of the cutting and removing pipe portion of the existing pipe is improved while improving the efficiency and labor saving of the removal work after the valve installation. It can be reliably and easily installed even under conditions shorter than the pipe diameter, and while providing a fixture to prevent co-rotation of the cutting device, the overall valve structure after construction is compact and the liquid leakage surface It is in the point which provides the valve installation method of the useful existing pipe which can aim at the reliability improvement of this.

  A first characteristic configuration according to the present invention includes a cutting unit provided with a cutting tool for cutting a pipe portion to be cut and removed from an existing pipe along the circumferential direction, and the cutting unit supported rotatably around a pipe axis. A cutting device having a guide support is mounted, and a cutting work area of an existing pipe including the cutting device is sealed with a case having an upward opening and a work housing having a downward opening having a work opening / closing valve. In addition, a plurality of fixtures provided on the working housing are pressed and fixed at a plurality of circumferential positions of the guide support of the cutting device from the radially outer side so as not to be relatively rotatable. In this state, the cutting device cuts and removes the existing pipe. After cutting the planned pipe section and releasing the pressing and fixing with the fixing device provided in the work housing, the cutting device is taken out together with the cutting and removal pipe section through the work on-off valve and opened for work. The flow path of the existing pipe is shut off by pressing and fixing the valve body inserted through the valve to the valve seat formed on the inner wall surface of the case through the cut end face of the cutting residual pipe portion of the existing pipe, The point is that the work housing provided with the work on-off valve and the fixture is removed from the case.

  According to the above characteristic configuration, a plurality of circumferential positions of the guide support of the cutting device are radially reduced by the case surrounding the planned cutting and removal portion of the existing pipe including the cutting device in a sealed state and the plurality of fixtures provided on the working housing. By pressing and fixing in a relatively non-rotatable manner from the outer side in the direction, it is possible to avoid a cutting failure due to the displacement of the cutting device around the tube axis with respect to the existing tube. In addition, by cutting the cutting unit of the cutting device around the tube axis and feeding the cutting tool of the cutting unit inward in the radial direction, it is possible to cut the planned removal portion of the existing pipe while maintaining the uninterrupted flow state. At the same time, the cutting width in the tube axis direction can be set to a cutting width smaller than the tube diameter.

  Next, after releasing the pressing and fixing by the fixture provided on the working housing side, the cut and separated pipe part is taken out together with the cutting device through the working on-off valve and inserted through the working on-off valve. Of the existing pipe is sent between the cut end faces of both of the remaining cutting pipe parts, and the valve body is fixed to the valve box while being pressed against the valve seat formed on the inner wall surface of the case. Can be cut off.

  When the flow path of the existing pipe is shut off, the work housing provided with the work on-off valve and the fixture can be removed from the opening of the case, so the case where the fixture is provided on the case side As described above, even after the construction, a part of the fixing tool does not protrude from the case, and leakage due to the protruding part of the fixing device colliding with another object can be avoided.

  Therefore, the case of the valve to be installed can be used as a part of the working housing, and the cutting and removal planned portion of the existing pipe can be cut and removed with a cutting width smaller than the pipe diameter. While improving the efficiency and labor saving of the removal work after valve installation, the length of the existing pipe cutting and removing pipe part is shorter than the pipe diameter and the case length is surely shorter than the pipe diameter, Easy to install. In addition, while providing a fixture to prevent the cutting device from co-rotating, it is possible to remove the fixture on the working housing side at the same time that the working on / off valve is removed. And improved reliability in terms of leakage.

  According to a second characteristic configuration of the present invention, the work housing side fixing tool is attached to an auxiliary case that is detachably interposed between the opening of the case and the work on-off valve. .

  According to the above characteristic configuration, the auxiliary case is interposed between the opening of the case and the work on / off valve, so that the connection between the cutting device mounted on the existing pipe to be cut and removed and the work on / off valve. Through the relatively large space formed in the auxiliary case, the fixture attached to the auxiliary case can press and fix a plurality of circumferential directions on the upper half side of the guide support of the cutting device in an efficient posture. Since the case can be removed together with the on-off valve for work, it is possible to reduce the size after construction compared to the case where all the fixtures are provided on the case side constituting the valve box.

  A third characteristic configuration according to the present invention is that, before the valve body is inserted, the chips remaining on the bottom in the case are removed to the outside by a movable discharge pipe inserted through the working on-off valve. .

  According to the above characteristic configuration, the chips generated by the cutting action of the cutting device can be discharged out of the case by the movable discharge pipe inserted through the work on / off valve. It is possible to satisfactorily suppress the occurrence of poor sealing due to the outflow to the valve and the adhesion of chips to the valve seat surface.

  A fourth characteristic configuration according to the present invention is that the recovery pipe is attached to a cover body that is detachably attached to the work on-off valve so as to be rotatable and vertically movable.

  According to the above characteristic configuration, the bottom part in the case can be smoothly moved over a wide range by the recovery pipe that can be rotated and moved up and down with respect to the lid body. Powder can be efficiently discharged to the outside.

[First Embodiment]
1 to 24 show an example of an existing water pipe 1 buried in the ground, which is an example of an existing pipe, and a gate valve V provided with a flow rate adjusting function (flow rate control function), which is an example of a valve, in an indefinite water state Shows the valve installation facility installed in the flow state) and the valve installation method using the valve installation facility. The valve installation facility has a valve box function that encloses an area a little wider than the planned cutting and removal location of the existing water pipe 1 in a sealed state. A case A having a divided structure, a work housing C having a work opening / closing valve B that can be opened and closed to form a work space sealed by the case A, and a cutting tool 4 that is an example of both cutting tools. Uncut water state by moving while cutting both pipes in the radial direction along the pipe circumferential direction at the planned cutting position which becomes the end face 1b of the cutting residual pipe part (previously described as the cutting residual pipe part) 1B. As planned, cutting and removal pipe part of the existing water pipe 1 ( A cutting device E that cuts and removes 1A in a ring shape with a cutting width W smaller than its tube diameter D, and a cutting device E that holds the cut and removed pipe portion 1A. In addition, the valve body insertion port 8 which is the upper opening of the case A and the first lifting / lowering holding device F which can be moved up and down to the upper space S1 in the work housing C through the work opening / closing valve B, and the valve body insertion port of the case A The valve body 2B that blocks the flow path at the cut and removed portion of the existing water pipe 1 is integrally formed in a T shape with respect to the lid portion 2A that seals 8 and the cut opening of both cut remaining pipe portions 1B A valve body 2 in which an auxiliary valve body 3 that can be opened and closed around a longitudinal axis Y along a radial direction passing through the tube axis X is assembled to a valve body 2B that is concentrically opposed to 1a; The valve body 2 is held and the valve body insertion port 8 of the case A and the work on-off valve B are And a second lifting holding device G elevating freely inserting untouched it to a predetermined valve body mounting position between the cut end surface 1b of the two cut leaving pipe portion 1B is provided as main components.

  As shown in FIGS. 9 and 10, the case A is in a sealed state with respect to the existing pipe 1A for cutting and removing the existing water pipe 1 and the pipe 1B for cutting and leaving for the valve box continuous on both sides thereof. A lower case 6 having an upward opening covering from below and an upper case 7 having a downward opening covering from the upper side in a sealed state with respect to the cutting and removal planned pipe part 1A and the cutting remaining pipe part 1B are provided as main components. 6 and 7 are configured so as to be integrated by welding at the time of mounting on 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 the upper case 7. On the upper end side, a cylindrical valve body insertion port portion 7B provided with a valve body insertion port 8 and a connecting flange portion 7A through which the cutting device E and the valve body 2 can be taken in and out in the vertical direction is integrally formed.

  Moreover, as shown in FIG. 10, the connection formed in the edge part of both cylindrical case part 6A, 7C externally held by the outer peripheral surface of the existing water pipe 1 among both cases 6 and 7 integrated. The flange portion 9 compresses an elastic sealing material 10 interposed between the tapered inner peripheral surfaces of the cylindrical case portions 6A and 7C and the outer peripheral surface of the existing water pipe 1 from the tube axis X direction. A push ring 11 having a divided structure is fastened and fixed by a plurality of T-bolts 12 and nuts 13. Further, at a plurality of locations in the circumferential direction of each push ring 11, detachment prevention bolts 14 that bite into the outer peripheral surface of the existing water pipe 1 are provided. It is screwed.

  As shown in FIGS. 9 and 10, the inner bottom wall surface 6 a of the lower case 6 has a cutting action by the two cutting tools 4 of the cutting device E at a position located below the both cutting scheduled positions of the existing water pipe 1. A drainage port (an example of a drainage port) 16 for discharging chips (chips) generated along with a part of tap water (an example of liquid) from the tangential direction to the outside is formed and communicated with each drainage port 16. The drain pipe (an example of the drain pipe) 17 is provided with a drain valve (an example of the on-off valve) 18 that can be freely opened and closed, and both the circumferential sides of the drain ports 16 on the inner bottom wall surface 6 a of the lower case 6. Aside from this, there is provided a cradle 19 for mounting and supporting the leg member 42 provided at the bottom of the guide support portion E2 of the cutting device E in a fitting state so as to be detachable from the vertical direction.

  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 57, 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.

  Further, as shown in FIG. 21, the valve body 2 suspended and supported in the work case 25 of the work housing C via the lift cylinder shaft 29 of the second lift holding device G is connected to the work opening / closing valve B and the case. When lowering to the predetermined valve body mounting position without touching the cut end face 1b of both cutting residual pipe sections 1B through the valve body insertion port 8 of A, the drain valve 18 of the lower case 6 and the work case 25 By connecting the provided water supply valve 50 through the water supply pipe 51, when the gate valve 46 of the work on-off valve B is opened, the pressure difference between the upper space S1 and the lower space S2 can be reduced. Therefore, the opening operation of the gate valve body 46 can be easily performed with little effort.

  As shown in FIGS. 9, 10, and 23, an elastic sealing material 2 </ b> C provided on the outer peripheral surface of the valve body 2 </ b> B of the valve body 2 is in a sealed state on the inner wall surfaces of the integrated cases 6 and 7. A valve seat 20 having a substantially U-shape or semi-oval shape when viewed in the tube axis X direction is formed, and the valve seat 20 is formed from the left and right inner wall surfaces 6b and inner bottom wall surfaces 6a of both cases 6 and 7. The ridge is also slightly formed inward.

  As shown in FIGS. 21 to 23, the inner peripheral surface of the valve body insertion port portion 7 </ b> B of the upper case 7 is pressed into a sealed state by the elastic sealing material 2 </ b> D provided on the outer peripheral surface of the lid portion 2 </ b> A of the valve body 2. The upper corner portion of the lid portion 2A of the valve body 2 is formed in a tapered surface 2a located on the center side toward the upper side, and the circumferential direction of the valve body insertion port portion 7B of the upper case 7 At a plurality of places, when the valve body 2 is in a valve body mounting position where the flow path is blocked, the lid 2A of the valve body 2 is to be secured in a state where the valve body 2 is pressed against the valve seat 20 of the case A. A presser bolt 21 having a tapered pressing surface 21a for pressing down the tapered surface 2a on the tip side is screwed to the tightening side from the horizontal direction.

  As shown in FIGS. 23 and 24, when the valve body 2 is secured to the valve seat 20 of the case A in a pressed state, the connection flange portion 7A of the valve body insertion port portion 7B of the upper case 7 has The valve lid 22 for sealing the valve body insertion port 8 of the case A is fixedly connected in a sealed state via bolts 27 and nuts 28, and the upper valve shaft of the valve body 2 is disposed at the center of the valve lid 22. A bearing portion 22A for supporting the portion 2E is formed, and a connecting flange portion 22B formed at the upper end of the bearing portion 22A is connected to the operation shaft 5A of the operating means 5 for opening and closing the auxiliary valve body 3 from the outside of the case A. On the other hand, a speed reducer 15 that is detachably linked from the vertical direction is attached.

  As shown in FIGS. 23 and 24, the operating means 5 has upper and lower end portions of the auxiliary valve body 3 so as to pivotally support the auxiliary valve body 3 about the longitudinal axis Y with respect to the valve body 2. The operation shaft 5A is integrally formed with the upper rotation fulcrum shaft among the rotation fulcrum shafts formed on the upper surface of the reduction gear 15, and the reduction gear 15 is connected to the operation shaft 5A of the operation means 5 on the upper surface of the reduction gear 15. A rotating operation shaft 15A that is linked via a mechanism is provided in a projecting manner.

  As shown in FIGS. 17 to 22, the working housing C is configured so that the cutting device E and the valve body 2 are alternatively accommodated in the connecting flange portion 7 </ b> A of the case A and the internal space of the case A. A lower connecting flange portion 23A of the auxiliary case 23 that forms a possible lower space S2 is fixedly connected in a sealed state through bolts 27 and nuts 28 so as to be detachable, and the upper connecting flange portion 23B of the auxiliary case 23 has a work The lower connecting flange portion 24A of the valve case 24 of the on-off valve B is fixedly connected to the upper connecting flange portion 24B of the valve case 24 through a bolt 27 and a nut 28 in a sealed state. A lower connecting flange portion 25A of a work case 25 having a vertically divided structure that forms an upper space S1 in which E and the valve body 2 can be alternatively stored is sealed via bolts 27 and nuts 28. Further, the lifting cylinder shaft 29 of the first lifting / lowering holding device F or the lifting cylinder shaft 29 of the second lifting / lowering holding device G is vertically connected to the upper connecting flange portion 25B of the work case 25. A connecting flange portion 26A of the lid cover 26 that is slidably supported is fixedly connected through a bolt 27 and a nut 28 so as to be detachable in a sealed state.

  The said cutting device E cut | disconnects along a pipe circumferential direction in the cutting plan position used as the end surface of both the cutting remaining pipe parts 1B of the existing water pipe 1, as shown in FIG.3, FIG.4, FIG.9-11. A plurality of cutting units E1 provided with cutting tools 4, a pair of left and right sprocket wheels 31 equipped with the cutting unit E1, and left and right for fitting and supporting them rotatably around the tube axis X of the existing water pipe 1 A guide support portion E2 having a pair of guide disks 30 and externally fixed to the cut and removal planned pipe portion 1A of the existing water pipe 1, and a drive portion E3 for driving and rotating both sprocket wheels 31 It is configured.

  Each cutting unit E1 includes a sliding guide portion 34 for slidably guiding a cutting tool holder 33 for detachably holding the cutting tool 4 in a pipe radial direction to a mounting part 32 provided on the sprocket wheel 31; The feed screw shaft 35 is united by the engagement of the feed screw shaft 35 for sliding the tool holder 33 along the guide portion 34 and the engagement member 36 provided on the guide support portion E2 on the side of the rotation path of the cutting unit E1. A passive rotating body 37 that provides rotation corresponding to the feed amount is provided.

  The drive part E3 is driven and rotated around an axis parallel to the pipe axis X of the existing water pipe 1 in conjunction with the input shaft 38 which is rotatable around the vertical axis Y at the upper part of the guide support part E2. A transmission case 40 having a pair of left and right drive sprockets 39 is provided, and a transmission chain 41 is wound around each drive sprocket 39 and each sprocket wheel 31 located on the same side thereof.

  As shown in FIGS. 2 to 4, the guide support portion E <b> 2 includes a pair of upper and lower guide support bodies 53 and 54 that are divided in half on a virtual horizontal plane passing through the tube axis X of the existing water pipe 1. Each of the guide support bodies 53 and 54 has pipe flanges 53A and 54A for fixing and connecting the adjacent ones in the pipe circumferential direction via bolts 55 and nuts 56 to the pipe circumferential ends. It is integrally formed to project radially inward.

  The upper guide support body 53 or the lower guide support body 54 of the guide support portion E2 has a water intake port (liquid intake port) 60 formed so as to penetrate in a state in which a section 59 is cut out in a part of the cut and removed planned pipe portion 1A. A cylindrical case 61 covering the periphery of the planned formation location, and a pipe contact portion 61A continuously provided on the radially inner end side of the cylindrical case 61 are sealed in a sealed state on the outer peripheral surface side of the planned cut-and-removed pipe portion 1A. A plurality of fixing bolts (an example of fixing means) 63 that are pressed and fixed from the pipe are attached to the pipe contact portion 61A of the cylindrical case 61 and the inner peripheral surface of the pipe contact portion 61A around the water intake 60 and to be cut and removed. An elastic sealing material 62 that seals between the outer peripheral surface of the pipe portion 1A is mounted, and the valve body 64A is opened and closed on the male screw portion formed on the radially outer end side of the cylindrical case 61. Operation handle 6 Intake on-off valve 64 having a B is screwed fixed in a sealed state.

  Further, as shown in FIG. 5 to FIG. 8 and FIG. 13, with respect to the connecting flange portion 64 </ b> C of the water intake on / off valve 64, the cutting / removal scheduled pipe portion 1 </ b> A passes through the inside of the on / off valve 64 and the cylindrical case 61. A connection flange portion 68A of a water intake perforation apparatus H provided with a hole saw 70, which is a cutting tool for forming a water intake (liquid intake) 60 in a part, and an opening / closing valve 65 for hand operation are provided at the tip side. A connection flange portion 66A of a water supply hose 66, which is an example of a flexible liquid supply pipe, can be selectively connected in a sealed state.

  As shown in FIGS. 5 to 7, the water intake perforation apparatus H is driven by a driving portion 67 such as an electric motor or an engine, and is driven to rotate by a casing 68 and slidably driven in the direction of the perforation axis. A driving rotational force and a feeding force are applied to the shaft 69, and the hole saw 70 connected to the distal end portion of the driving rotational shaft 69 is fed along the pipe diameter direction through the water intake on-off valve 64 that has been opened. Thus, the water intake 60 is formed in a part of the cut and removal planned pipe portion 1A.

  The hole saw 70 is composed of a cylindrical body 70A having a cutting tip provided at the tip, and a center drill 70B protruding forward from the cutting tip through the center position of the cylindrical body 70A. Further, an up-and-down swingable retaining piece (not shown) is provided to prevent the section 59 that has entered the cylindrical body 70A from coming out.

  The thickness (plate thickness) t of the slice 59 collected by the hole saw 70 is measured, and based on the actual measurement, the planned cutting portion of the existing water pipe 1 is not cut or separated or is broken by the pressure of tap water as will be described later. The cutting device E is preliminarily cut to the extent not to be removed, and the chips generated by the preliminary cutting are removed, and then the cutting work area of the existing water pipe 1 is sealed with the case 6 and the working housing C. And the cutting scheduled part of the existing water pipe 1 is cut | disconnected by the cutting device E following the said preliminary cutting.

  In the two places in the circumferential direction of the lower case 6 of the case A and the two places in the circumferential direction of the auxiliary case 23, and in parts that are substantially opposite to each other in the radial direction or in a position that is close thereto, the existing water pipe 1 is cut. In order to prevent relative rotation with the guide support part E2 of the apparatus E, the fixture J which presses and fixes the circumferential direction four places of the guide support part E2 from the radial direction outer side in the state which cannot be relatively rotated is provided.

  As shown in FIG. 12, each fixture J on the side of the auxiliary case 23 is attached to a fixed cylinder 72 fixed to the auxiliary case 23 in an inclined posture along the radial direction. The guide cylinder 73 provided with a bolt and the like is fastened and fixed in a relatively non-rotatable manner. The guide cylinder 73 is provided with a receiving surface 74a of a receiving shaft 74 that is fixedly projected to the upper guide support body 53 of the guide support portion E2. A pressing shaft 75 having a pressing surface 75a that can be pressed from the outside in the radial direction is fitted in the radial direction so as to be slidable and rotatable. A screw cap 76 that is screwed into a male screw portion 75b formed on the half side is fixed in a relatively non-rotatable state. Further, the upper end of the pressing shaft 75 is provided with a pressing shaft 75 in a loosened lock nut 77. For rotating with a tool Angular shaft-like operation engaging portion 75c is formed.

  When the cutting device E is lifted into the upper space S1 of the working housing C together with the cutting / removing tube portion 1A, the pressing shaft 75 that has pressed the receiving shaft 74 of the upper guide support body 53 is replaced with the receiving shaft 74. The tip is moved back outward in the radial direction until it is retracted out of the locus of raising and lowering the tip.

  Further, each fixture J of the lower case 6 is also configured in the same manner as each fixture J on the auxiliary case 23 side. Specifically, with reference to FIG. A guide cylinder 73 provided with a flange 73a that comes into contact with the lower end surface of the fixed cylinder 72 fixed in a slanting posture is fastened and fixed with a bolt or the like so as not to be relatively rotatable. The pressing shaft 75 having a pressing surface 75a capable of pressing the receiving surface 74a of the receiving shaft 74 protruding and fixed to the lower guide support body 54 of the guide support portion E2 from the outside in the radial direction slides in the radial direction. A screw cap 76 that is rotatably fitted and is screwed into a male screw portion 75 b formed on the lower half side of the pressing shaft 75 at the lower end portion of the guide cylinder 73 so as not to be relatively rotatable. And the lower end of the pressing shaft 75 Is hexagonal shaft-shaped operation engaging portion 75c for rotating the pressing shaft 75 with a tool in a state of loosening the lock nut 77 is formed.

  The first elevating / holding device F and the second elevating / holding device G have the same structure, and the lower end portion of each elevating cylinder shaft 29 has a transmission case 40 of the cutting device E or the upper valve shaft portion of the valve body 2. A connecting portion 44 that is fixedly connected in a state that can be selectively hung with respect to 2E is provided, and a transmission shaft that transmits power to the input shaft 38 of the cutting device E is provided in each lifting cylinder shaft 29. (Not shown) is provided, and an electric motor 45 for driving the transmission shaft is detachably provided at the upper end of each lifting cylinder shaft 29.

  Each of the front and back both surfaces of the auxiliary valve body 3 assembled to the valve body 2 is configured as a partial spherical surface from which the tube axis X side of the existing water pipe 1 protrudes most.

  As shown in FIGS. 18 and 19, the working on-off valve B is screwed into the gate valve body 46, which is slidable in the horizontal direction and shuts off the internal passage of the valve case 24 in a sealed state. An operation handle 48 that opens and closes via a screw shaft 47 is provided.

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, a work pit P is formed by excavating a work area including a valve installation location of an existing water pipe 1 buried in the ground, and a base concrete 80 containing a reinforcing bar is formed at the bottom of the work pit P. Is constructed, and reinforcing column concrete 81 with a reinforcing bar for maintaining the concentric state after cutting both the cut and left pipe portions 1B of the existing water pipe 1 is constructed.

  As shown in FIGS. 2 and 3, the lower guide support body 54 of the guide support part E2 of the cutting device E is temporarily fixed to the lower case 6 of the case A, and the existing water pipe 1 is to be cut and removed in this state. It inserts through the space | gap between the part 1A and the upper surface of the base concrete 80, and installs on the some temporary support stand 89 mounted in the predetermined position on the base concrete 80. FIG.

The upper guide support body 53 of the guide support part E2 of the cutting device E is mounted on the pipe part 1A to be cut and removed of the existing water pipe 1, and the connecting flange parts 53A and 54A of both guide support bodies 53 and 54 are bolted to each other. By fixing and connecting with the nut 56, the guide support part E2 of the cutting device E is fixedly attached to a predetermined position of the cutting and removal planned pipe part 1A of the existing water pipe 1.
At this time, the attachment interval in the tube axis X direction of the cutting tool 4 of the cutting unit E1 equipped on both the sprocket wheels 31 is set to a predetermined cutting width W narrower than the pipe diameter D of the existing water pipe 1. Yes.

  As shown in FIG. 4, the temporary fixing of the lower case 6 of the case A and the lower guide support body 54 of the cutting device E is released, the temporary support base 89 is removed, and the lower case 6 is placed on the upper surface of the base concrete 80. The electric motor 45 is connected to the input shaft 38 of the transmission case 40 of the cutting device E, and the electric motor 45 is driven to adjust the cutting unit E1, the guide support portion E2, and the like.

  When adjusting the cutting device E, as shown in FIGS. 5 and 6, the connection flange portion 68A of the water intake perforation device H is connected to the connection flange portion 64C of the water intake on-off valve 64 attached to the guide support portion E2. Are fixedly connected in a sealed state, then the valve body 64A of the water intake on-off valve 64 is opened to drive the driving portion 67 to drive the driving rotary shaft 69 supported by the casing 68. And the hole saw 70 connected to the tip of the drive rotating shaft 69 is fed along the pipe radial direction through the inside of the water intake on-off valve 64 that is opened, thereby cutting and cutting scheduled pipe portion A water intake 60 is formed through a part of 1A.

  When the intake port 60 is formed through the cutting and removal planned pipe portion 1A, as shown in FIGS. 7 and 8, the hole saw 70 of the intake port punching device H is moved back to the initial standby position, and the intake opening / closing valve is moved. 64 valve body 64A is closed and the connection flange portion 68A of the water intake perforation device H is removed from the connection flange portion 64C of the intake water on-off valve 64, and the connection flange portion 64C of the water intake on-off valve 64 is used for hand operation. The connection flange portion 66A of the water supply hose 66 provided with the on-off valve 65 is fixedly connected in a sealed state.

  When the water inlet piercing device H is removed, the section 59 held by the center drill 70B of the hole saw 70 is extracted, the thickness (plate thickness) t of the section 59 is measured, and the thickness of the measured section 59 is measured. Based on the above, the maximum cutting depth for preliminary cutting by the cutting device E in a state in which the planned cutting portion of the existing water pipe 1 is not cut and separated or is not broken by the water pressure of tap water is calculated.

  Next, as shown in FIGS. 9 and 10, the cutting device E is applied to the planned cutting / removal pipe portion 1 </ b> A of the existing water pipe 1 and the planned cutting remaining pipe portion 1 </ b> B for mounting the valve box on both sides thereof. The cover flange 6B of the lower case 6 and the connection flange 7D of the upper case 7 are hermetically sealed with bolts 27 and nuts 28 in a state of covering the guide support portion E2 and the cutting unit E1 having the two-part structure. Temporarily fastened and connected, the connecting flange portions 6B and 7D of both cases 6 and 7 are integrated by welding at the time of mounting to the existing water pipe 1 on the divided joint surface on the virtual horizontal plane passing through the tube axis X of the existing water pipe 1 Turn into.

  Among the integrated cases 6 and 7, the tapered inner peripheral surface and the existing water pipe 1 are provided at 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. The elastic seal material 10 interposed between the outer peripheral surfaces of the two pressurized wheels 11 is compressed and tightened in a sealed state from the direction of the tube axis X, and is screwed into a plurality of positions in the circumferential direction of each presser wheel 11. The detachment prevention bolt 14 is tightened to a retaining state in which the bolt 14 is inserted into the outer peripheral surface of the existing water pipe 1, and the case A is tightly sealed over the both-cutting remaining pipe portions 1B of the existing water pipe 1 in a sealed state. Secure it to the position.

  As shown in FIGS. 11 and 12, the connecting flange portion 23 </ b> A of the auxiliary case 23 provided with the fixture J constituting the working housing C is sealed with the bolt 27 and the nut 28 on the connecting flange portion 7 </ b> A of the upper case 7. The operation engaging portion of each pressing shaft 75 of the fixture J provided at two places in the circumferential direction of the lower case 6 and the fixture J provided at two places in the circumferential direction of the auxiliary case 23. 75c is screwed to the tightening side with a tool so that the receiving surface 74a of the receiving shaft 74 protruding from the lower guide support body 54 and the upper guide support body 53 of the guide support portion E2 is radially inward. The relative rotation between the existing water pipe 1 and the guide support portion E2 of the cutting device E is prevented by pressing and fixing from the outside in the radial direction with the pressing surface 75a of each pressing shaft 75 moved toward.

  As shown in FIG. 13, the water intake opening / closing valve 64 communicating with the water intake port 60 of the planned cutting / removal pipe portion 1A and the water supply hose 66 connected to the water supply hose 66 are opened and opened, respectively. The tap water flowing out from the water intake 60 of the planned removal pipe portion 1A is supplied as leak test water into the space formed by the case A and the auxiliary case 23.

As shown in FIG. 14, the connection flange portion 82A of the hydraulic pressure test cover 82 is fixedly connected to the upper connection flange portion 23B of the auxiliary case 23 in a sealed state via bolts 27 and nuts 28, and the hydraulic pressure test cover 82 is connected to a water pressure gauge 83 and a pressure water supply pipe 85 having a water pressure pump 84, and the stored tap water in the water storage tank 86 storing the tap water from the water supply hose 66 is pumped into the case A. To test for leaks in Case A.
When it is confirmed that there is no water leakage, the test water in the case A and the water pressure test cover 82 is discharged to the outside through both the drainage pipes 17 and the drainage valve 18 formed in the lower part of the lower case 6, and then the auxiliary case 23 The water pressure test cover 82 is removed from the upper connecting flange portion 23B.

  As shown in FIG. 15, before the case A and the work housing C are sealed, in other words, the upper connection flange portion 23B of the auxiliary case 23 is connected to the work opening and closing which is another component of the work housing C. Before the valve case 24, the work case 25, and the lid cover 26 of the valve B are sequentially attached and sealed, the electric motor 45 is connected to the input shaft 38 of the transmission case 40 of the cutting device E, the electric motor 45 is started, The pre-cutting part of the existing water pipe 1 is pre-cut by the pre-cutting depth calculated based on the measured value of the thickness of the section 59.

  That is, when the electric motor 45 is started, both the sprocket wheels 31 equipped with the cutting unit E1 are driven to rotate through a pair of left and right drive sprockets 39 and a transmission chain 41, and the sliding guide portions 34 of the respective sprocket wheels 31 are driven. Then, the cutting tool 4 mounted on the tool holder 33 slidable in the pipe diameter direction moves along the pipe circumferential direction at the planned cutting position to be the end surface 1b of both of the remaining cutting pipe parts 1B. When the passive rotating body 37 of the feed screw shaft 35 that slides is engaged with the engaging member 36 provided on the guide support portion E2 beside the rotation path of the cutting unit E1, the feed screw shaft 35 corresponds to a unit feed amount. Rotation is applied, and the cutting tool 4 is fed by a unit feed amount inward in the pipe radial direction.

  In this way, the cutting tool 4 is moved while being fed inward in the radial direction along the pipe circumferential direction at the planned cutting position to be the end face 1b of both of the remaining cutting pipes 1B, and the maximum feed amount inward in the radial direction is set. By controlling to the pre-cutting depth, it is possible to pre-cut the planned cutting portion of the existing water pipe 1 into a circumferential groove shape within a range where it is not cut and separated or is not broken by the water pressure of tap water.

  As shown in FIG. 16, the electric motor 45 is removed from the input shaft 38 of the transmission case 40 of the cutting device E, and a water intake opening / closing valve 64 communicating with the water intake port 60 of the cutting / removal scheduled pipe portion 1A is connected thereto. Opening and closing valves 65 for connecting the hand of the water supply hose 66 are each opened, and chips (cuts) accumulated on the bottom side in the case A using tap water flowing out from the water intake 60 of the pipe portion 1A to be cut and removed. Waste) is discharged to the outside.

  As shown in FIGS. 17 and 18, the upper connecting flange portion 23 </ b> B of the auxiliary case 23 is connected to the valve case 24 of the work on / off valve B, which is another component of the work housing C, the cutting device E and the valve body 2. The work case 25 and the lid cover 26 that form an upper space S1 that can be alternatively stored are fixedly connected in a sealed state, and the lifting cylinder shaft 29 of the first lifting and lowering holding device F is penetrated and supported by the lid cover 26. The connecting portion 44 of the elevating cylinder shaft 29 and the transmission case 40 of the cutting device E are fixedly connected.

  Further, a transmission shaft (not shown) provided in each lifting cylinder shaft 29 and an input shaft 38 of the cutting device E are interlocked and connected, and the transmission is transmitted to the upper portion of the lifting cylinder shaft 29 of the first lifting / lowering holding device F. An electric motor 45 for driving the shaft is attached.

  Next, when the electric motor 45 is started, both the sprocket wheels 31 equipped with the cutting unit E1 are driven to rotate through the transmission shaft in the lifting cylinder shaft 29, the input shaft 3, the pair of left and right drive sprockets 39, and the transmission chain 41. The cutting tool 4 mounted on the tool holder 33 slidable in the pipe radial direction with respect to the sliding guide part 34 of each sprocket wheel 31 is scheduled to be cut to become the end face 1b of both of the remaining cutting pipe parts 1B. The passive rotating body 37 of the feed screw shaft 35 that moves along the pipe circumferential direction at the position and slides the tool holder 33 is engaged with the engaging member 36 provided on the guide support portion E2 beside the rotation path of the cutting unit E1. In this case, rotation corresponding to the unit feed amount is applied to the feed screw shaft 35, and the cutting tool 4 is fed by the unit feed amount inward in the pipe radial direction.

  Then, following the preliminary cutting step, the cutting tool 4 is moved while being fed radially inward along the pipe circumferential direction in the circumferential groove preliminarily cut to the planned cutting position of both of the remaining cutting pipe portions 1B. Thus, the cutting and removal planned pipe portion 1A of the existing water pipe 1 can be cut and separated into a ring shape with a cutting width W smaller than the pipe diameter D of the existing water pipe 1 in an undisrupted water state.

  At this time, the both drain valves 18 are opened, and chips (chips) generated by the cutting action of the cutting tool 4 of the cutting device E are placed below the planned cutting positions 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 20 can be satisfactorily suppressed.

  Further, since the cutting tool 4 of the cutting device E is cut and separated in a ring shape while being moved along the circumferential groove that has been pre-cut at the planned cutting position that becomes the end surface 1b of both of the remaining cutting pipe portions 1B, along with the cutting action As a result, the amount of chips generated can be significantly reduced, and the protrusion of both cutting tools 4 into the pipe during cutting is small, so that an increase in the flow resistance of tap water can be suppressed.

  19 and 20, the lifting cylinder shaft 29 of the first lifting / lowering holding device F is lifted by the lifting means such as a crane with respect to the lid cover 26 of the working housing C, and the cutting device E is cut and removed. After being taken out into the upper space S1 of the working housing C together with 1A, the working on-off valve B is closed, and the upper connecting flange portion 24B of the valve case 24 of the working on-off valve B and the lower connecting flange of the work case 25 The connection with the portion 25A is released, and the cutting device E is removed together with the cutting / removing tube portion 1A, the work case 25 and the lid cover 26.

  As shown in FIG. 20, a discharge pipe 90 of a chip discharging tool for discharging chips to the outside using the water pressure of tap water is rotated and slid vertically in the upper connecting flange portion 24B of the valve case 24. A lid body 92 having a pipe support portion 91 at the center position for penetrating and supporting in a watertight state in a movable manner is fixedly connected in a sealed state with bolts 27 and nuts 28, and then penetrated into the pipe support portion 91 of the lid body 92. By opening and closing the open / close valve 93 provided at the hand of the supported discharge pipe 90 and moving the tip of the discharge pipe 90 along the inner bottom wall surface of the case A in this state, the inner bottom wall surface of the case A is moved. The remainder of the swarf generated at the time of cutting scattered in is discharged to the outside together with tap water.

  Next, as shown in FIG. 21, the elevating cylinder shaft 29 of the second elevating / holding device G is passed through the lid cover 26, the connecting portion 44 of the elevating cylinder shaft 29 and the valve body 2 are fixedly connected, and the lid After the upper connection flange portion 25B of the work case 25 is fixedly connected to the connection flange portion 26A of the cover 26 with a bolt 27 and a nut 28 in a sealed state, the assembly is lifted by a lifting means such as a crane. The lower connecting flange portion 25A is fixedly connected to the upper connecting flange portion 24B of the valve case 24 with a bolt 27 and a nut 28 in a sealed state.

  As shown in FIGS. 21 and 22, the drain valve 18 of the lower case 6 and the water supply valve 50 provided in the work case 25 are connected in communication by a water pipe 51, and the drain valve 18 and the water supply valve 50 are opened. The fluid in the existing water pipe 1 is supplied into the upper space S1 formed by the work case 25 and the lid cover 26, and the upper space S1 and the lower space S2 are made the same pressure or the pressure difference is reduced. Then, the gate valve body 46 of the work on-off valve B is opened.

  When the work open / close valve B is opened, the lift cylinder shaft 29 of the second lift holding device G is lowered by the lifting means such as a crane with respect to the lid cover 26 of the work housing C, and the valve body 2 is used for work. After inserting into the predetermined valve body mounting position without touching the cut end face 1b of both of the cutting residual pipe portions 1B through the on-off valve B and the valve body insertion port 8 of the case A, the upper surface of the lid cover 26 and the lifting cylinder shaft 29 is provided with a hydraulic pressurizing tool 94 that moves the lifting / lowering cylinder shaft 29 downwardly. The hydraulic pressurizing tool 94 allows the entire valve body 2 to be connected to the case A via the lifting / lowering cylinder shaft 29. To the valve seat 20 side.

  In this state, the elastic sealing material 2D provided on the outer peripheral surface of the lid portion 2A of the valve body 2 is pressed against the inner peripheral surface of the valve body insertion port portion 7B of the upper case 7 in a sealed state, and the valve body 2 The elastic sealing material 2C provided on the outer peripheral surface of the valve body portion 2B is pressed in a sealed state on the valve seat 20 formed on the inner wall surfaces of the integrated cases 6 and 7, and the existing water pipe 1 is cut and removed. The flow path is blocked at the location.

  As shown in FIGS. 23 and 24, when the presser bolts 21 screwed and attached to a plurality of locations in the circumferential direction of the valve body insertion port portion 7B of the upper case 7 are tightened inward in the radial direction, each presser bolt 21 is operated. The taper-shaped pressing surface 21a formed on the tip end side of the valve body 2 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 valve body 2 is the valve of the case A. The seat 20 is fixed in a sealed state pressed against the seat 20.

  Next, the fixed connection between the connecting flange portion 7A of the upper case 7 and the lower connecting flange portion 23A of the auxiliary case 23 provided with the fixture J is released, and the working housing C and the second lifting / lowering holding device G are moved to the case A. The valve lid 22 for sealing the valve body insertion port 8 of the case A is fixedly connected to the connection flange portion 7A of the upper case 7 via bolts 27 and nuts 28, and the bearing portion of the valve lid 22 is further connected. A reduction gear 15 is attached to a connecting flange portion 22B formed at the upper end of 22A. The speed reducer 15 is detachably interlocked with the operating shaft 5A of the operating means 5 for opening and closing the auxiliary valve body 3 from the outside of the case A.

  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.

  Moreover, not only can the operating shaft 5A of the operating means 5 for opening and closing the auxiliary valve body 3 be easily operated with a small operating force, but the speed reducer 15 for this purpose can be used as the upper valve shaft portion 2E of the valve body 2. Can be mounted using the valve lid 22 that seals the valve body insertion port 8 of the case A, and the mounting structure can be simplified.

  In the first embodiment, as shown in FIGS. 8 to 10, a water intake 60 is formed by drilling from a radial direction in a part of the cut and removal planned pipe portion 1 </ b> A of the existing water pipe 1 which is an example of the existing pipe. A water supply hose 66, which is an example of a flexible liquid supply pipe provided with a water intake opening / closing valve 64, is connected to the water intake 60, but is an example of an existing pipe as shown by the phantom line in FIG. A water intake 60 is formed by drilling a part of the existing pipe 1B to be cut from the radial direction in the existing water pipe 1, and a flexible liquid supply pipe having a water intake opening / closing valve 64 is formed in the water intake 60. For example, a water supply hose 66 may be connected.

  In this case, the portion of the planned cutting remaining pipe portion 1B that forms the water intake port 60 may be either a tube wall portion that is hermetically surrounded by the work housing C or a tube wall portion that is located outside the work housing C. Good.

[Other Embodiments]
(1) In the above-described first embodiment, a cutting tool is used as the cutting tool 4 of the cutting device E. However, instead of this, a disc-shaped cutting tool or end meal is used, and both cutting residual pipe portions 1B are used. The cutting and removal planned pipe part 1A of the existing water pipe 1 is cut and removed in a ring shape by moving it while feeding it radially inward along the pipe circumferential direction at the planned cutting position that becomes the end face of the pipe. It may be configured.

  (2) In each of the above-described embodiments, the case A is vertically divided into two, but may be divided into three or more in the vertical 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 by sliding in the vertical direction.
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 above-described first embodiment, the two cases 6 and 7 constituting the case A are mounted on 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 it was configured to be integrated by welding, the two cases 6 and 7 may be configured to be joined by flange.

  (5) In the first embodiment described above, the valve body 2 is set in a state in which the valve body 2 is not touched between the cut end faces 1b of both the cut residual pipe portions 1B through the valve body insertion port 8 of the case A and the work on-off valve B However, no burrs or the like are generated on the cut end face 1b of both of the cutting residual pipe portions 1B, and the seal applied to the valve body 2 or the auxiliary valve body 3 is constructed. When not seriously damaging the material, a part or the whole of the cut end face 1b of both of the cut remaining pipe parts 1B may be used for the lifting guide part of the valve body 2.

(6) In the above-described first embodiment, the water intake (liquid intake) 60 is formed in a state where the section 59 is cut out in a part of the cut-and-removed planned pipe portion 1A, and the section 59 collected at the time of drilling is cut. Based on the actual measurement of the thickness (plate thickness) t, the maximum cutting depth when the cutting device E is preliminarily cut by the cutting device E within the range where the planned cutting portion of the existing water pipe 1 is not cut and separated or is not broken by the pressure of tap water In the case where the thickness (plate thickness) t of the pipe portion 1A to be cut and removed from the chips is drilled by drill drilling or the like, it is possible to calculate the type and nominal diameter of the existing pipe 1 Based on the above, the maximum cutting depth when the cutting device E is preliminarily cut by the cutting device E within a range where the planned cutting portion of the existing water pipe 1 is not cut and separated or is not broken by the pressure of tap water is calculated.
In this case, perforation for a part of the cut and removal scheduled pipe portion 1A is only to form a water intake (liquid intake).

The side view at the time of the work pit excavation which shows 1st Embodiment of the cutting removal method and valve installation method of the existing pipe | tube of this invention Cross-sectional front view when the lower case is inserted below the pipe part to be cut and removed Cross-sectional front view when the upper half of the cutting device is attached to the tube part to be cut and removed Cross-sectional front view when a cutting device is attached to the pipe part to be cut and removed, and the lower case is lowered. Enlarged partially cutaway front view of the main part of the cutting device when a water intake perforation device is attached to the intake support on-off valve of the guide support Front view of an enlarged part of the main part at the time of drilling by a water intake drilling device Front view of an enlarged part of the main part after drilling by a water intake drilling device Front view of an enlarged part of the main part when a water supply hose is connected to the intake valve on the guide support Cross-sectional front view when the upper case is connected to the lower case Cross-sectional side view when the upper case is connected to the lower case Cross-sectional front view when the auxiliary case is connected to the upper case Enlarged partially cutaway front view of fixture Cross-sectional front view when supplying tap water as leakage test water into the case Cross-sectional front view during water pressure test Cross-sectional front view showing preliminary cutting process after water pressure test Cross-sectional front view showing discharge of chips generated in the preliminary cutting process Cross-sectional front view when the valve case is connected to the auxiliary case Cross-sectional side view when sealed with case and work housing Cross-sectional front view when the cutting device holding the cutting and removing pipe part is raised to the upper space Cross-sectional front view when the discharge pipe of the chip discharging tool is installed Sectional front view when a valve body is mounted in the upper space of the working housing Sectional front view when the valve element is lowered into the lower space in the upper space of the working housing Sectional side view when the housing is removed and the lid is attached Cross-sectional side view with reducer installed

Explanation of symbols

A Case B Work on-off valve C Work housing E Cutting device E1 Cutting unit E2 Guide support part J Fixture 1 Existing pipe (existing water pipe)
1A Cutting / removing tube (cutting / removal planned tube)
1B Cutting and leaving pipe (cutting and leaving planned pipe)
1b Cutting end face 8 Upper opening (valve insertion port)
20 Valve seat 23 Auxiliary case 90 Discharge pipe 92 Lid

Claims (4)

  A cutting unit provided with a cutting tool for cutting the existing pipe to be cut and removed along the circumferential direction and a cutting device provided with a guide support for rotatably supporting the cutting unit around the pipe axis are mounted. Then, the cutting work area of the existing pipe including this cutting device is sealed with a case having an upward opening and a work housing having a downward opening provided with a work opening / closing valve, and a plurality of fixings provided on the case and the work housing. With the tool, a plurality of circumferential positions of the guide support of the cutting device are pressed and fixed so as not to rotate relative to each other from the radially outer side, and in this state, the cutting and removal planned pipe portion of the existing pipe is cut by the cutting device. After releasing the pressing and fixing by the fixing tool provided on the cutting device, the cutting device is taken out together with the cutting / removing pipe portion through the work on / off valve, and the valve body inserted through the work on / off valve is already installed. The flow path of the existing pipe is shut off by being pressed against and fixed to the valve seat formed on the inner wall surface of the case through the cut end surfaces of the remaining cutting pipe portion of the pipe, and then the work on-off valve and fixture are removed from the case. The existing pipe valve installation method, characterized by removing the working housing provided with   2. The valve installation method for an existing pipe according to claim 1, wherein the fixing member on the work housing side is attached to an auxiliary case that is detachably interposed between the opening of the case and the work on-off valve.   The valve installation method for an existing pipe according to claim 1 or 2, wherein chips remaining on the bottom of the case are removed to the outside by a movable discharge pipe inserted through a work on-off valve before the valve body is inserted. . 4. The valve installation method for an existing pipe according to claim 3, wherein the recovery pipe is attached to a lid body detachably attached to the work on-off valve so as to be freely rotatable and vertically movable.

Images