JP4981540B2 - Equipment connection structure for existing fluid pipes and undisturbed fluid equipment installation method - Google Patents

Description

  In the present invention, both connecting pipe parts of fluid equipment corresponding to the cutting and removing pipe part are arranged in a concentric or substantially concentric state between both cut and remaining pipe parts of the cut part of the existing fluid pipe, and the pipe axis direction Between the sealing residual pipe part and the connecting pipe part of the fluid device that are opposed to each other between the outer peripheral surface of the cutting residual pipe part and the outer peripheral surface of the connecting pipe part. Equipment connection structure of existing fluid pipes connected by a joint ring movable in the axial direction of the pipe axis with sealing means for sealing, and a part of the existing fluid pipe is cut in an uninterrupted state in a sealed housing The present invention relates to a continuous flow type fluid device installation method for connecting a fluid device corresponding to the cut and removed pipe portion after removal, and more particularly to improvement of a rust prevention treatment technique for the cut end surfaces of both of the cut remaining pipe portions.

  In a conventional equipment connection structure for an existing fluid pipe, a first split joint ring having a first seal member of a sealing means for sealing the joint ring with an outer peripheral surface of the cutting residual pipe part, and the fluid And a second split joint ring having a second seal member as a sealing means for sealing between the outer peripheral surface of the connecting pipe portion of the device, and the first split joint ring and the second split joint ring are connected to the pipe. An engagement means for watertightly engaging from the axial direction is provided, and the second split joint ring is a rust-preventing seal member that comes into contact with the cut end surface of the remaining cutting pipe portion from the axial direction. (See, for example, Patent Documents 1 and 2).

  In addition, the existing fluid pipe is installed in a sealed housing after cutting and removing a part of the existing fluid pipe in an uninterrupted flow state, and then connecting the fluid equipment in place of the cut and removed pipe portion. And a first divided joint ring having a first sealing member of a sealing means for sealing between the outer peripheral surface of the planned cutting remaining pipe portion positioned on both sides of the planned cutting and removal pipe portion, and the fluid For both the connecting pipe parts of the equipment, the second sealing member for sealing between the outer peripheral surfaces of the connecting pipe parts and the cutting end face of the remaining cutting pipe part are contacted from the tube axis direction for rust prevention. A second split joint ring including the third seal member is externally slidable in the tube axis direction.

Next, after cutting and removing the pipe portion to be cut and removed from the existing fluid pipe by the cutting device, the fluid device is inserted into the cut portion, and the second connecting pipe portion of the fluid device is externally attached. The split joint ring is pushed out in the direction of the pipe axis, and the second split joint ring and the first split joint ring mounted on the cutting residual pipe portion are watertightly engaged. The 3 seal member is brought into close contact with the cut end surface of the remaining cut pipe portion from the tube axis direction.
JP 2006-112540 A JP 2006-112541 A

  In the conventional rust prevention technology by the equipment connection structure of existing fluid pipes and the fluid equipment installation method, in order to bring the third seal member into close contact with the cut end surface of the cut remaining pipe part evenly in the circumferential direction, It is necessary to form the third seal member in a shape corresponding to the shape of the cutting end surface of the remaining cutting tube portion. In particular, in the case where the cutting device is a hole saw, the cutting end surface of the remaining cutting tube portion in the perforation direction view is required. Since the planar shape is an arc around the perforation center and changes three-dimensionally along the curved surface of the existing fluid pipe, the shape of the third seal member and the mounting seat on the side of the second split joint to which it is attached The shape becomes very complicated, and the mounting accuracy of the first split joint ring to the both cutting and leaving pipe portions and the mounting accuracy of the second split joint ring to both connection pipe portions of the fluid device are increased, and the state is improved. Maintained for both minutes It is necessary to engage the collar, there is a disadvantage that the Shorai complication of soaring reduction and device connection structure of the manufacturing cost, a decrease or the like of the construction efficiency.

  The present invention has been made in view of the above-mentioned actual situation, and the main problem is that the rust prevention treatment for the cut end surfaces of the two cutting residual pipe portions is reduced in the manufacturing cost and the structure is simplified. It is the point which provides the equipment connection structure of the existing fluid pipe | tube which can be performed favorably, aiming at the improvement of construction efficiency, and the fluid equipment installation construction method.

According to the first characteristic configuration of the present invention, both connecting pipe portions of the fluid device corresponding to the cutting and removing pipe portion are arranged concentrically or substantially concentrically between the two cutting residual pipe portions of the cutting portion of the existing fluid pipe. And a joint ring movable in the tube axis direction connecting the cutting residual pipe portion and the connecting pipe portion of the fluid device, which are opposed to each other in the pipe axis direction, has an outer peripheral surface of the cutting residual pipe portion. A device for connecting an existing fluid pipe provided with a sealing means for sealing between and a sealing means for sealing between the outer peripheral surface of the connecting pipe part,
The cutting end portion of each of the remaining cutting tube portions is provided with an annular recess that can be fitted in from the tube axis direction, and at least sealing means for sealing the cutting end surface of the cutting end portion is provided in the annular recess. The rust preventive cover provided for the fitting is fitted and mounted, and the fitting allowance with the cut end portion in the annular recess of the rust preventive cover is the annular end surface of the connecting pipe portion of the fluidic device and the rust preventive cover. The gap between the outer bottom surface and the connecting pipe portion of the fluid device is configured to be larger than the interval between the outer bottom surface in the tube axis direction, and further through the radially outer side of the anticorrosion cover. It is connected, and the joint ring is provided with a fixing means for retaining and fixing the rust preventive cover fitted and attached to the cut end of the remaining cutting pipe part in the fitted state. is there.

  According to the above characteristic configuration, the annular concave portion of the rust preventive cover is fitted from the tube core direction to the cut end portion of each of the cutting residual pipe portions, and the cut residual pipe portion is formed by the annular concave portion of the rust preventive cover. For example, the cutting end surface of the remaining cutting tube portion is inclined with respect to the tube axis, or the hole saw of the cutting device is used. Even under the condition that the arc is curved along the arc, the fitting depth of the antirust cover is set to a depth corresponding to the degree of inclination and the degree of curvature of the cut end surface. At least the cut end face of the cut end can be reliably sealed by the sealing means provided in the annular recess of the rust preventive cover.

  In addition, in a state where the annular recess of the rust preventive cover is fitted to the cut end portion of the remaining cutting pipe portion, the tube axis between the end surface of the connecting pipe portion of the fluid device and the annular outer bottom surface of the rust preventive cover Since the facing interval in the direction is configured to be smaller than the fitting allowance with the cut end portion of the remaining cutting pipe portion in the annular recess of the rust preventive cover, the friction retention of the sealing means against the rust preventive cover is achieved. Even if an external force exceeding the force is applied, the rust-proof cover can be reliably prevented from coming off by contact with the end face of the connecting pipe portion of the fluid device.

Therefore, by rational improvement only by preparing a rust-proof cover provided with an annular recess for fitting allowance in consideration of the shape of the cut end face of the remaining cutting pipe and the facing distance from the end face of the connecting pipe of the fluid device. The rust prevention treatment for the cut end surfaces of both of the cut residual pipe portions can be reliably and satisfactorily performed while reducing the manufacturing cost, simplifying the structure, and improving the construction efficiency.
Furthermore, since the rust preventive cover fitted and attached to the cut end portion of the cutting residual pipe portion can be prevented from being moved out by the fixing means provided on the joint ring, it is possible to prevent the cutting end surface of the cutting residual pipe portion from being cut off. The rust effect can be reliably and satisfactorily maintained over a long period of time.

  According to a second characteristic configuration of the device connection structure of the existing fluid pipe of the present invention, the annular outer bottom surface of the rust preventive cover is cut off from both ends by contact with the end of the connection pipe portion of the fluid device. It is in the point formed in the movement guide surface which carries out movement guidance to the predetermined mounting position between placement tube parts.

  According to the above characteristic configuration, when both connecting pipe parts of a fluid device that replaces the cutting and removing pipe part are arranged in a concentric or substantially concentric state between the two cutting residual pipe parts of the cutting part of the existing fluid pipe, Using the annular outer bottom surface of the anticorrosion cover that is fitted and attached to the cut ends of both of the remaining cutting pipe portions and maintained in a predetermined posture, for example, by the moving guide surface formed with this annular outer bottom surface, Even if the cutting end face of the cutting residual pipe part is inclined with respect to the pipe axis or is curved in an arc along the hole saw of the cutting device, both cutting residual pipes of the fluid device It is possible to reliably move and guide the predetermined mounting position between the parts, and to simplify the guide structure for moving and guiding the fluid device to the predetermined mounting position.

  According to a third characteristic configuration of the device connection structure for an existing fluid pipe according to the present invention, an extension cylindrical cover portion extending along an inner peripheral surface of the connection pipe portion of the fluid device is formed on the rust prevention cover, and this extension The sealing means for sealing between the outer peripheral surface of the cylindrical cover part and the inner peripheral surface of the connecting pipe part is provided.

  According to the above characteristic configuration, in the state in which the annular recess of the rust prevention cover is fitted to the cut end portion of each of the remaining cutting pipe portions from the tube axis direction, the rust prevention cover is provided in the annular recess. At least the cut end surface of the cut end portion is sealed by the sealing means, and the extended cylindrical cover portion formed on the anticorrosion cover enters along the inner peripheral surface of the connection pipe portion of the fluid device, and seals Since the space between the outer peripheral surface of the extended cylindrical cover part and the inner peripheral surface of the connection pipe part is sealed by the means, the rust preventive cover and the extension cylindrical cover with the end face of the connection pipe part of the fluid device facing The annular space surrounded by the part and the joint ring becomes a sealed space blocked from the flow path in the pipe, and an antirust effect on the end face of the connecting pipe part of the fluid device can be obtained.

According to a fourth characteristic configuration of the device connection structure of the existing fluid pipe of the present invention, a tapered guide surface having a larger diameter toward the opening side end portion of the inner peripheral surface of the outer cylindrical cover body of the rust prevention cover. Is formed, and a tapered guide surface having a smaller diameter toward the front end side is formed at the opening side end portion of the outer peripheral surface of the inner cylindrical cover body of the rust preventive cover.

  According to the above characteristic configuration, even when the shaft core of the rust prevention cover is slightly displaced in the radial direction with respect to the shaft core of the both-cut remaining pipe portion of the existing fluid pipe, the outer cylindrical shape of the rust prevention cover By the guide action to the eccentricity correction side by the taper-shaped guide surface formed on the cover body and the taper-shaped guide surface formed on the inner cylindrical cover body, with respect to the cut end portions of the both cut residual pipe portions Thus, the annular recess of the rust-proof cover can be securely and smoothly fitted and attached.

The fifth characteristic configuration according to the present invention is an uninterrupted flow type fluid device in which a part of an existing fluid pipe is cut and removed in an unbroken state in a sealed housing, and then a fluid device corresponding to the cut and removed pipe portion is connected. It is an installation method, and comprises the following steps 1) to 6).
1) Parts located on both sides of an existing fluid pipe to be cut and removed, or both connecting pipe parts of the fluid device, or both of them, and both connecting pipe portions of the fluid device and left and right cutting remaining pipe portions A housing with a working valve that can be opened and closed in a state of sealing the cutting work area of the existing fluid pipe is installed. .
2) The cutting and removal planned pipe portion of the existing fluid pipe is cut by the cutting device in the housing, and the cutting device is removed from the housing together with the cut and removed pipe portion.
3) An annular recess and at least a cutting end in which the cutting end of the cutting remaining pipe part can be fitted from the pipe axis direction in a cover holding part that is reciprocally movable in the pipe axis direction equipped in the cover mounting machine. A rust-proof cover provided with a sealing means for sealing the cut end surface of the part is mounted, and this cover mounting machine is held by the lifting device mounted on the housing, and the rust-proof cover is left and right after cutting. The cover mounting machine held by the elevating device is lowered to the cutting position of the existing fluid pipe until it reaches the concentric position or the substantially concentric position with the placement tube section.
4) The cover holding unit of the cover mounting machine is driven forward so that the rust preventive cover is fitted and mounted to the cut end of the remaining cutting pipe from the tube axis direction, and then the cover mounting machine Is removed from the housing.
5) The lifting device provided in the housing holds the fluid device, and until the both connecting pipe portions of the fluid device reach the concentric position or the substantially concentric position with the left and right cutting remaining tube portions, The fluid device held by the lifting device is lowered to the cutting position of the existing fluid pipe.
6) The cutting residual pipe part and the connecting pipe part of the fluid device that face each other in the pipe axis direction through the radially outer side of the rust preventive cover by the feeder device provided in the housing; Then, the housing including the lifting device and the work valve is removed.

  According to the above characteristic configuration, the cutting end surfaces of the two remaining cutting pipe portions of the existing fluid pipe are exposed to the fluid by cutting and removing the pipe portion to be cut and removed from the existing fluid pipe in the housing. In the invention, after the cover mounting machine held by the elevating device is lowered to the cutting position of the existing fluid pipe, the cover holding part of the cover mounting machine is driven forward, and the rust-proof cover held by it Is fitted and attached to the cut end portion of the cut residual pipe portion from the tube axis direction, so that the cut end surface of the cut residual pipe portion and the inner and outer peripheral surfaces continuous with the annular concave portion of the antirust cover are provided. Since the end side can be covered, for example, the cutting end surface of the cutting residual pipe part is inclined with respect to the pipe axis, or is curved in an arc along the hole saw of the cutting device Even if the depth of fitting of the rust-proof cover In any case, at least the cutting end face of the remaining cutting pipe portion is securely sealed by the sealing means provided in the rust prevention cover, only by setting the depth to the depth according to the inclination degree or the bending degree of the cutting end face. Can do.

  When the process of fitting and mounting the rust-proof cover is completed, the fluid device held by the lifting device of the housing is placed in a concentric position or a substantially concentric position with the left and right cutting remaining tube portions. After being lowered until it reaches, the cutting residual pipe section and the fluid that face each other in the pipe axis direction through the radially outer side of the rust preventive cover by the feeder device provided in the housing Since it slides to the joining area | region over the connection pipe part of an apparatus, after the fitting installation process of a rust prevention cover is complete | finished, a process does not increase.

  Accordingly, a rust-proof cover having an annular recess for fitting allowance considering the shape of the cut end face of the remaining cutting pipe and the end face of the connection pipe of the fluid device is prepared, and the cover is mounted with this Since the machine is lowered to a predetermined position by using the lifting device provided in the housing, the rust preventive cover attached to the cover mounting machine is simply fitted and attached to the cutting end of the remaining cutting pipe. The rust prevention treatment for the cut end surfaces of both of the cut residual pipe portions can be reliably and satisfactorily performed while reducing the manufacturing cost, simplifying the structure, and improving the construction efficiency.

A sixth characteristic configuration according to the present invention is an uninterruptible fluid device in which a part of an existing fluid pipe is cut and removed in an uninterrupted flow state in a sealed housing, and then a fluid device corresponding to the cut and removed pipe portion is connected. It is an installation method, and comprises the following steps 1) to 6).
1) A joint ring for connecting the connecting pipe parts of the fluid device and the left and right cutting remaining pipe parts in a sealed state at portions located on both sides of the pipe part to be cut and removed of the existing fluid pipe, A housing having a work valve which is slidably mounted in the core direction and can be opened and closed in a state where the cutting work area of the existing fluid pipe is sealed is installed.
2) The cutting and removal planned pipe portion of the existing fluid pipe is cut by the cutting device in the housing, and the cutting device is removed from the housing together with the cut and removed pipe portion.
3) Cut at least in an annular recess in which the cut end portion of the cutting residual pipe portion can be fitted from the tube axis direction to a cover holding portion that is reciprocally movable in the tube axis direction provided in the cover mounting machine. Rust prevention provided with a sealing means for sealing the cut end face of the end, and an extended cylindrical cover part having sealing means for sealing between the inner peripheral surface of the connecting pipe part of the fluidic device Mount the cover, hold the cover mounting machine on the lifting device mounted on the housing, until the rust preventive cover reaches the concentric position or the substantially concentric position with the left and right cutting residual pipe parts, The cover mounting machine held by the lifting device is lowered to the cutting position of the existing fluid pipe.
4) The cover holding unit of the cover mounting machine is driven forward so that the rust preventive cover is fitted and mounted to the cut end of the remaining cutting pipe from the tube axis direction, and then the cover mounting machine Is removed from the housing.
5) Hold the fluid device in the lifting device mounted on the housing, and until both connecting pipe portions of the fluid device reach the concentric position or the substantially concentric position with the left and right cutting remaining tube portions, The fluid device held by the lifting device is lowered to the cutting position of the existing fluid pipe.
6) A connection between the cutting residual pipe part and the fluid device that are opposed to each other in the pipe axis direction by connecting the joint ring attached to the two cutting residual pipe parts by a feeder device provided in the housing. The rust preventive cover is extended to the connecting pipe part side of the fluid device by sliding the joint part extending to the pipe part to the connecting pipe part side of the fluid device by the engaging part provided on the joint ring. After sealing between the inner peripheral surface of the connecting pipe part with the sealing means of the part, the housing provided with the lifting device and the work valve is removed.

  According to the above characteristic configuration, the cutting end surfaces of the two remaining cutting pipe portions of the existing fluid pipe are exposed to the fluid by cutting and removing the pipe portion to be cut and removed from the existing fluid pipe in the housing. In the invention, after the cover mounting machine held by the elevating device is lowered to the cutting position of the existing fluid pipe, the cover holding part of the cover mounting machine is driven forward, and the rust-proof cover held by it Is fitted and attached to the cut end portion of the cut residual pipe portion from the tube axis direction, so that the cut end surface of the cut residual pipe portion and the inner and outer peripheral surfaces continuous with the annular concave portion of the antirust cover are provided. Since the end side can be covered, for example, the cutting end surface of the cutting residual pipe part is inclined with respect to the pipe axis, or is curved in an arc along the hole saw of the cutting device Even if the depth of fitting of the rust-proof cover In any case, at least the cutting end face of the remaining cutting pipe portion is securely sealed by the sealing means provided in the rust prevention cover, only by setting the depth to the depth according to the inclination degree or the bending degree of the cutting end face. Can do.

  Moreover, when the fitting process of the anticorrosion cover is completed, the fluid device held by the lifting device of the housing is connected to the left and right cutting remaining tube portions or substantially concentric with the both connecting tube portions thereof. After being lowered until reaching the position, the joint ring mounted on the both cutting residual pipe portions is piped through the radially outer side of the anticorrosion cover by the feeder device mounted on the housing. Since it slides to the joint area spanning the cutting residual pipe part and the connecting pipe part of the fluid device that face each other in the axial direction, the process will not increase after the fitting and fitting process of the anticorrosion cover is completed. .

  Further, when the joint ring is slid to the joint region extending between the cutting residual pipe part and the connecting pipe part of the fluid device, the locking parts provided in the joint ring are used in the middle of the sliding by the locking parts. The anticorrosion cover fitted and attached to the cut end portion of the cutting residual pipe portion is moved to the connecting pipe portion side of the fluid device, and the connecting pipe is sealed by the extension cylindrical cover portion of the antirust cover. Since the space between the inner peripheral surface of the part can be sealed, an annular space surrounded by the rust preventive cover, the extended cylindrical cover part, and the joint ring and facing the end face of the connecting pipe part of the fluidic device is formed. And it becomes the sealed space interrupted | blocked from the flow path in a pipe | tube, and the rust prevention effect with respect to the end surface of the connection pipe part of the said fluid apparatus can be acquired.

  Accordingly, a rust-proof cover having an annular recess for fitting allowance considering the shape of the cut end face of the remaining cutting pipe and the end face of the connection pipe of the fluid device is prepared, and the cover is mounted with this Since the machine is lowered to a predetermined position by using the lifting device provided in the housing, the rust preventive cover attached to the cover mounting machine is simply fitted and attached to the cutting end of the remaining cutting pipe. The rust prevention treatment for the cut end surfaces of both of the cut residual pipe portions can be performed satisfactorily while reducing the manufacturing cost, simplifying the structure, and improving the construction efficiency.

  Moreover, an annular space surrounded by the rust preventive cover, the extended cylindrical cover portion and the joint ring in a state where the end face of the connecting pipe portion of the fluid device faces by the sealing means of the extended cylindrical cover portion of the rust preventive cover. By constituting the sealed space, it is possible to simultaneously obtain a rust prevention effect on the end face of the connecting pipe portion of the fluidic device.

[First Embodiment]
1 to 14 show a part of an existing underground water pipe 1 buried in the ground, which is an example of an existing fluid pipe, cut and removed in a lower working space S1 of a housing H that is sealed in an indefinite water state (indefinite flow state). After that, a new installation which is an example of a fluid device provided with a pair of connecting pipe portions 2 in place of the cutting / removing pipe portion 1A between both cut residual pipe portions 1B of the existing water pipe 1 left in the housing H. Uninterrupted water type gate valve installation method (an example of an uninterrupted flow type fluid device installation method) that connects the gate valve B and an existing water pipe gate valve connection structure obtained by the method (example of an existing fluid pipe device connection structure) ).

  The equipment used for the above-mentioned continuous water type gate valve installation method includes a housing H provided with a work gate valve A for sealingly enclosing a region slightly wider than the planned site for cutting and removal of the existing water pipe 1, and a cutting tool 3 Is moved by feeding it inward in the radial direction along the pipe circumferential direction at the planned cutting end position 1a of both cutting residual pipe parts (referred to as cutting residual pipes before cutting) 1B. A cutting device C that cuts a cut-and-removal planned pipe part (which will be referred to as a cut-and-removed pipe part after cutting) 1A of the existing water pipe 1 in a flowing state, and a cut and removed pipe part 1A that has been cut. An elevating device (carrying means) for taking out from the lower space S1 of the housing H together with the cutting device C to the upper space S2 in the housing H through the working gate valve A which is an example of a working valve and carrying it out of the housing H. A first lifting / lowering holding device D that can be moved up and down, and a cutting end portion of both of the cutting remaining pipe portions 1B includes an annular recess 4D that can be fitted from the tube axis X direction, and at least the cutting end portion A rust-proof cover 4 provided with sealing means 30 for sealing the cut end face 1a in the annular recess 4D, and a cover holding part 6 for holding the rust-proof cover 4 so as to be reciprocally movable along the tube axis X direction. The cover mounting machine E provided, and the cover mounting machine E is held between the cutting end face 1a of both cutting residual pipe portions 1B in the lower space S1 through the upper space S2 in the housing B and the work partition valve A. To the predetermined loading position, that is, to the predetermined loading position where the center line of the anticorrosion cover 4 held by the cover mounting machine E is concentric with or substantially concentric with the tube axis X of the both-cut residual pipe portion 1B. Second elevating and lowering device that is an example of a lifting and lowering device (loading and unloading means) Holding down the lowering device F and the new gate valve B, the upper gate S2 in the housing H and the work gate valve A are passed between the cutting end faces 1a of the two cutting residual pipe portions 1B in the lower space S1. Elevating device for carrying in to a predetermined loading position, that is, to a predetermined loading position where the shaft cores of both connecting pipe portions 2 of the gate valve B are concentric or substantially concentric with the tube shaft core X of the both cutting residual pipe portions 1B ( Tube axis through the radially outward side of the rust preventive cover 4 fitted and attached to the cut ends of the two cutting residual pipe portions 1B. A pair of split ring joints 7 for connecting the two connecting pipe portions 2 of the gate valve B facing each other in the X direction and the remaining cutting pipe portion 1B of the existing water pipe 1 in a sealed state; The outer ring 7 attached to each cutting residual pipe part 1B is connected to the connection pipe part 2 of the gate valve B by an external operation. A feeder device J that slides in the direction of the tube axis X up to the connecting seam is provided as a main component.

  The housing H includes a lower case 8 having an upward opening that covers from the lower side in a sealed state with respect to the cut and removed planned pipe part 1A of the existing water pipe 1 and the cut and left planned pipe part 1B for housing mounting continuous on both sides thereof, An upper case 9 having a downward opening that covers the cut and removal planned pipe portion 1A and a planned cut remaining pipe portion 1B in a sealed state from above, and a valve case 10 of the working gate valve A in the upper opening 9a of the upper case 9 is provided. The working case 11 to which the flange is joined is provided as a main component, and the lifting cylinder shaft 12 of the first lifting and lowering holding device D and the second lifting and lowering holding device F are provided in the upper opening 11a of the working case 11. A lid cover 13 capable of selectively supporting the elevating cylinder shaft 12 and the elevating cylinder shaft 12 of the third elevating / holding device G so as to be slidable in the vertical direction is flange-bonded in a sealed state.

  As shown in FIGS. 4 to 6, the cutting device C cuts a cutting bit 3 that cuts along the pipe circumferential direction at a planned cutting position that becomes the cutting end surface 1 a of both of the remaining cutting pipe portions 1 </ b> B of the existing water pipe 1. A plurality of cutting units C1 provided, a pair of left and right sprocket wheels 16 equipped with the cutting unit C1, and these are fitted so as to be rotatable around an axis slightly inclined with respect to the tube axis X of the existing water pipe 1. It is composed of a guide support part C2 having a two-divided structure that can be jointly supported and is externally fixed to the cut and removal planned pipe part 1A of the existing water pipe 1, and a drive part C3 that drives and rotates both sprocket wheels 16. Yes.

Each cutting unit C1 has a tool holder 17 for detachably holding the cutting tool 3 attached to a mounting part of the sprocket wheel 16 so as to be movable in the pipe diameter direction, and a guide support part C2 beside the rotation path of the cutting unit C1. The screw holder 17 is provided with a screw type feed mechanism (not shown) that applies a moving force corresponding to a unit feed amount by engaging with an engaging member provided on the tool holder 17.

  The drive unit C3 is provided with a transmission case 19 provided with a pair of left and right drive sprockets 18 driven and rotated around an axis parallel to the tube axis X of the existing water pipe 1 on the upper part of the guide support unit C2. A transmission chain 20 is wound around each drive sprocket 18 and each sprocket wheel 16 located on the same side, and an electric motor 21 for driving the drive sprocket 18 is provided at the upper end of the elevating cylinder shaft 12. It is provided and configured.

The bottom of the guide support portion C2 of the cutting device C is a quadrangular pyramid that can be engaged and placed from above with respect to the engagement hole 22a of the cradle 22 provided on the inner surface of the bottom wall portion of the lower case 8. When the guide projection 23 is formed and the guide projection 23 is engaged and placed in the engagement hole 22a of the pedestal 22, the cutting / removing tube portion 1A held by the cutting device C after cutting and the both cutting remaining tubes Centering holding means for holding the portion 1B in a coaxial core state is configured.
The guide protrusion 23 is also attached to each of the cover mounting machine E and the gate valve B, and the rust-proof cover 4 mounted on the cover mounting machine E and the both cutting residual pipe portions 1B are coaxially connected. And both the connecting pipe portions 2 of the gate valve B and the both cutting remaining pipe portions 1B are held in a coaxial core state.

  The first elevating / holding device D, the second elevating / holding device F, and the third elevating / holding device G are each configured in the same structure, and a transmission case 19 of the cutting device C is provided at the lower end of each elevating cylinder shaft 12. A connecting portion 27 is provided that is fixedly connected to the support case 25 of the cover mounting machine E and the connecting flange portion 26 of the new gate valve B in a state where it can be selectively suspended. Is provided with a transmission shaft (not shown) for transmitting power to the drive sprocket 18 of the cutting device C.

  As shown in FIGS. 2 and 3, the rust-proof cover 4 is made of a metal having excellent corrosion resistance, such as stainless steel, and is in the direction of the tube axis X with respect to the cut end portion of the cut remaining pipe portion 1B. The outer cylindrical cover body 4A and the inner cylindrical cover body 4B that form an annular concave portion 4D that can be fitted to each other, and the annular bottom cover body 4C that are integrally formed over the back end portions thereof. In addition, a tapered guide surface 4a having a larger diameter toward the tip end side is formed at the opening side end of the inner peripheral surface of the outer cylindrical cover body 4A, and the outer periphery of the inner cylindrical cover body 4B. A tapered guide surface 4b having a smaller diameter toward the tip end side is formed at the opening side end of the surface.

  Further, an annular bottom cover body 4C of the rust prevention cover 4 is formed on a smooth surface along a vertical plane orthogonal or substantially orthogonal to the tube axis X, and the annular outer bottom surface 4c of the bottom cover body 4C is formed. Is formed on a moving guide surface 29 that moves and guides the gate valve B to a predetermined mounting position between the two cutting residual pipe portions 1B and 1B by contact with the end surfaces 2a of the two connecting pipe portions 2 of the gate valve B. At the same time, a sealing means 30 for sealing at least the cut end face 1a of the cut end portion is provided on the inner surface of the antirust cover 4 that is desired for the annular recess 4D.

  At the end edge of the outer peripheral surface of both connecting pipe portions 2 of the gate valve B, the elastic seal material 31 mounted on the large-diameter joint portion 7A of the joint ring 7 described later is moved over the tip side. A tapered surface 2c having a smaller diameter is formed, and for example, the cutting of the remaining cutting tube portion 1B is performed by the guide action by the contact between the tapered surface 2c of both the connecting tube portions 2 and the bottom cover body 4C of the antirust cover 4. Even when the end face 1a is inclined with respect to the tube axis X or is curved in an arc along the hole saw of the cutting device C, the gate valve B, which is an example of a fluid device, is both cut. It is possible to reliably guide the movement to the predetermined mounting position between the remaining pipe portions 1B, and it is possible to simplify the guide structure for guiding the gate valve B to the predetermined mounting position.

  The sealing means 30 includes an elastic seal layer 30a formed over the entire inner surface of the annular recess 4D, an opening edge of the annular recess 4D and the tube axis X in the elastic seal layer 30a on both cylindrical cover bodies 4A and 4B. The ring-shaped elastic seal projection 30b is integrally formed to project toward the other side at the center in the direction.

  In a state where the annular concave portion 4D of the rust preventive cover 4 is fitted to the cut end portion of the cut remaining tube portion 1B from the tube axis X direction, a part of the elastic seal layer 30a is left uncut. At the same time, the plurality of elastic seal projections 30b are elastically pressed against the inner and outer peripheral surfaces of the cut end portion of the remaining cutting tube portion 1B, and the opening of the annular recess 4D. It is configured to seal the space from the side to the bottom cover body 4C in a plurality of stages, and at the cutting end portion of the remaining cutting tube portion 1B by the pressure contact of the plurality of elastic seal protrusions 30b of the sealing means 30. The fitted rust preventive cover 4 is configured to frictionally hold against the fluid pressure.

  Moreover, as shown in FIGS. 1 and 2, the fitting allowance L <b> 1 with the cut end portion of the cutting residual pipe portion 1 </ b> B in the annular recess 4 </ b> D of the rust prevention cover 4 is the connecting pipe portion 2 of the gate valve B. The end face 2a of the rust preventive cover 4 and the annular outer bottom face 4c of the bottom cover body 4C of the rust preventive cover 4 are configured to be larger than the facing distance L2 in the tube axis X direction. Even when an external force acts on the side, the annular outer bottom surface of the bottom cover body 4C of the connecting pipe portion 2 of the gate valve B is in the middle of the fitting of the anticorrosive cover 4 to the cutting residual pipe portion 1B. Since it contacts the end surface 2a from the tube axis X direction, the rust preventive cover 4 does not fall out, and the rust preventive effect of the rust preventive cover 4 can be reliably and satisfactorily exhibited over a long period of time.

  As shown in FIGS. 7 and 8, the cover holding unit 6 of the cover mounting machine E is configured to have a connecting flange portion 25 </ b> A that can be fixedly connected to the connecting portion 27 of the second lifting / lowering holding device F as shown in FIGS. 7 and 8. 25, a plurality of locations on the same circumference corresponding to the rust preventive cover 4 fitted and attached to the cut ends of both of the cut remaining pipe portions 1B (in the present embodiment, 6 at equal intervals in the circumferential direction). A plurality of first fluid pressure cylinders 35 that extend and contract toward the cutting end face 1a of the upstream cutting residual pipe portion 1B, and the downstream cutting. A plurality of sets (three in the embodiment) of second fluid pressure cylinders 36 that extend and contract toward the cut end surface 1a of the remaining pipe portion 1B are attached in a state in which the phases are shifted in units of sets. Over the tip of the piston rod 35A of one fluid pressure cylinder 35 A first annular holding frame 37 provided with an annular holding groove 37A for detachably holding the upstream rust-proof cover 4 from the tube axis X direction is attached, and further, a piston rod 36A of the second fluid pressure cylinder 36 is attached. A second annular holding frame 38 provided with an annular holding groove 38A for detachably holding the downstream rust preventive cover 4 from the tube axis X direction is attached to the distal end portion.

Each of the inner surface of the annular holding groove 37A of the first annular holding frame 37 and the annular holding groove 38A of the second annular holding frame 38 is formed with an elastic layer 39 for frictionally holding the rust preventive cover 4. The friction holding force of the rust preventive cover 4 by the elastic layer 39 is configured to be smaller than the friction holding force by the sealing means 30 provided on the rust preventive cover 4, and the elastic layer 39 provides the rust preventive force. The flexibility for the runout correction that allows relative movement within a certain range in the radial direction of the cover 4 is configured.
In addition, the interlace correction is formed between the inner surface of the annular holding groove 37 </ b> A and the outer surface of the antirust cover 4 and between the inner surface of the annular holding groove 38 </ b> A and the outer surface of the antirust cover 4. You may comprise only with space.

  As shown in FIGS. 1 and 10 to 14, the joint ring 7 is connected to the gate valve B through the outer side in the radial direction of the rust preventive cover 4 fitted to the cut end portion of the cutting residual pipe portion 1 </ b> B. It is composed of a large-diameter joint portion 7A that is sheathed on the pipe portion 2 and a small-diameter joint portion 7B that is sheathed on the outer peripheral surface of the remaining cutting tube portion 1B excluding the mounting region of the antirust cover 4. An elastic sealing material 31 which is an example of a sealing means for sealing between the outer peripheral surface of the connecting pipe portion 2 of the gate valve B and the seal mounting groove 7a formed on the inner peripheral surface of the large-diameter joint ring portion 7A. Is attached to the seal mounting groove 7b formed on the inner peripheral surface of the small-diameter joint ring portion 7B, as an example of a sealing means for sealing between the outer peripheral surface of the connecting pipe portion 2 of the gate valve B. A certain elastic sealing material 32 is attached.

  As shown in FIGS. 9 to 14, the feeder device J is configured such that the end portion of the small-diameter joint portion 7 </ b> B of the joint ring 7 is placed on the side walls 8 </ b> A and 9 </ b> A of both cases 8 and 9 constituting the housing H. Among the annular pressing plate 41 having a divided structure for pressing to the side, a female screw member 43 for screwing and holding an operating screw shaft 42 that is rotatably coupled to a plurality of locations in the circumferential direction of the annular pressing plate 41 is provided. At a plurality of locations in the circumferential direction of the pressing plate 41, bolts 44 that are fastened and fixed to the outer peripheral surface of the small-diameter joint portion 7B of the joint ring 7 are screwed together.

Next, the continuous water type gate valve installation method will be described based on the following steps.
[1] As shown in FIG. 4, both the cut-off remaining pipes 1 </ b> B of the existing water pipe 1 are connected to both the connection pipes 2 of the new gate valve B and the both-cut residual pipes 1 </ b> B of the existing water pipe 1. A joint ring 7 having a divided structure for connecting in a sealed state is externally fitted so as to be slidable in the direction of the tube axis X, and a cutting device C is attached to the planned cutting / removal pipe portion 1A of the existing water pipe 1. The guide support portion C2 having a two-part structure is externally fitted and fixed, the sprocket wheel 16 and the cutting unit C1 are assembled to the guide support portion C2, and the transmission chain 20 is wound around the drive sprocket 18 and the sprocket wheel 16 of the drive portion C3. Turn.

The lower case 8 and the upper case 9 of the housing H are assembled to the cut and removed planned pipe portion 1A of the existing water pipe 1 and the cut and left planned pipe portion 1B for housing mounting continuous on both sides thereof. Both cases 8 and 9 are integrated in a sealed state by appropriate fixing means such as welding and bolts on a divided mating surface on a virtual horizontal plane passing through the tube axis X of the existing water pipe 1.
A split structure in which an operation screw shaft 42 is screwed into each of the female screw members 43 of the feeder device J provided on the side walls 8A and 9A of the cases 8 and 9, and is interposed in the planned cutting remaining pipe portion 1B. The annular pressing plate 41 and the operation screw shaft 42 are connected to each other only in relative rotation.

The lower part of the valve case 10 of the working gate valve A is fixedly connected to the upper opening 9a of the upper case 9 with a bolt or the like in a sealed state. The lower connecting flange portion 11B of the case 11 is fixedly connected in a sealed state with bolts and nuts, and the upper connecting flange portion 11B in the upper opening portion 11a of the working case 11 is lifted and lowered by the first lifting and lowering holding device D. The connecting flange portion 13A of the lid cover 13 that supports the cylindrical shaft 12 slidably in the vertical direction is fixedly connected in a sealed state with bolts and nuts.

  When the electric motor 21 is activated, the two sprocket wheels 16 equipped with the cutting unit C1 are driven to rotate through the transmission shaft in the elevating cylinder shaft 12, the pair of left and right drive sprockets 18, and the transmission chain 20, and each sprocket is driven. The cutting tool 3 mounted on the tool holder 17 slidable in the pipe diameter direction with respect to the wheel 16 is fed in a unit feed amount inward in the pipe diameter direction at a specific position beside the rotation path of the cutting unit C1. It moves along the pipe circumferential direction at the planned cutting position that becomes the cut end face 1a of both of the remaining cut pipe sections 1B, and the cut and planned pipe section 1A of the existing water pipe 1 is cut into a ring shape with a set cutting width in an undisturbed state. Cut and remove.

  [2] As shown in FIG. 5, the lifting cylinder shaft 12 of the first lifting / lowering holding device D is lifted by the lifting means such as a crane with respect to the lid cover 13 of the housing H, and the cutting device C together with the cutting / removing tube portion 1A. After being taken out into the upper space S2 of the housing H, the valve body 14 of the working gate valve A is closed and the connection between the upper connecting flange portion 11B of the working case 11 and the connecting flange portion 13A of the lid cover 13 is released. Then, the cutting device C is carried out of the housing H together with the cutting / removing tube portion 1 </ b> A and the lid cover 13.

  [3] As shown in FIG. 6, the elevating cylinder shaft 12 of the second elevating and holding device F is passed through the lid cover 13, and the connecting portion 27 of the elevating cylinder shaft 12 and the anticorrosion cover 14 are in a predetermined orientation. After fixing and connecting the connecting flange portion 25A of the support case 25 of the cover mounting machine E with bolts and nuts, the cover mounting machine E is lifted by the lifting means, and the cover mounting machine E is an upper space of the housing H. It carries in in S2, and the upper connection flange part 11B of the work case 11 and the connection flange part 13A of the cover cover 13 are fixedly connected in a sealed state.

  [4] As shown in FIG. 9, the valve body 14 of the work opening / closing valve A is opened and the lifting cylinder shaft 12 of the second lifting / lowering holding device F is lowered by the lifting means with respect to the lid cover 13 of the housing H. The support case 25 of the cover mounting machine E is held at the predetermined loading position between the cut end faces 1a of both the remaining cutting pipes 1B through the work gate valve A and the upper opening 9a of the upper case 9, that is, the cover mounting machine E. The center line of the rust preventive cover 14 is carried to a predetermined loading position where it is concentric with or substantially concentric with the tube axis X of the both-cut residual pipe portion 1B.

  Next, as shown in FIGS. 9 to 11, the set of three first fluid pressure cylinders 35 and the set of three second fluid pressure cylinders 36 constituting the cover mounting machine E are respectively extended and driven, The first annular holding frame 37 attached over the tip of the piston rod 35A of each set of the first fluid pressure cylinder 35 and the tip of the piston rod 36A of each set of the second fluid pressure cylinder 36 are attached. The second annular holding frame 38 is moved toward the cutting end surface 1a of the upstream cutting residual pipe portion 1B and the cutting end surface 1a of the downstream cutting residual pipe portion 1B, so that the first annular holding frame 37 is annularly held. The annular recess 4D of the rust preventive cover 14 held in the groove 37A is fitted and attached to the cut end of the upstream cutting residual pipe portion 1B, and is held in the annular holding groove 38A of the second annular holding frame 38. Rust cover 1 Causing the annular recess 4D is fitted and attached to the cut end of the cutting leaving pipe portion 1B of the downstream side.

  At this time, between the annular holding groove 37A of the first annular holding frame 37 and the antirust cover 14 and between the annular holding groove 38A of the second annular holding frame 38 and the antirust cover 14, the antirust cover is provided. 4 is provided for the purpose of correcting runout that allows relative movement within a certain range in the radial direction, so that the anti-corrosion against the shaft core of the both-cut remaining pipe portion 1B of the existing water pipe 1 is provided. Even if the shaft core of the rust cover 14 is slightly displaced in the radial direction, if the displacement is within the range of accommodation, the rust prevention is performed on the cut end portion of the remaining cutting pipe portion 1B while correcting the runout. The cover 14 can be fitted and attached reliably and smoothly.

  [4] As shown in FIG. 12, the first fluid pressure cylinder 35 and the second fluid pressure cylinder 36 of the cover mounting machine E are driven to contract, and are fitted and mounted to the cutting end of the cutting residual pipe portion 1B. The first annular holding frame 37 and the second annular holding frame 38 are moved away from the anticorrosive cover 14, and then the lifting cylinder shaft 12 of the second lifting / lowering holding device F is lifted by a lifting means such as a crane, After the cover mounting machine E is taken out into the upper space S2 of the housing H, the valve body 14 of the work gate valve A is closed, and the cover mounting machine E is carried out of the housing H.

[5] As shown in FIG. 13, after the connecting flange portion 26 of the new gate valve B is fixedly connected to the connecting portion 27 of the lifting cylinder shaft 12 of the third lifting and lowering holding device G with bolts and nuts, The valve B is lifted by the lifting means, the gate valve B is carried into the upper space S2 of the housing H, and the upper connecting flange portion 11B of the work case 11 and the connecting flange portion 13A of the lid cover 13 are fixedly connected in a sealed state. .
Further, the valve body 14 of the work opening / closing valve A is opened, the lifting cylinder shaft 12 of the third lifting / lowering holding device G is lowered by the lifting means with respect to the lid cover 13 of the housing H, and the gate valve B is moved to the work partition. A predetermined loading position between the cut end faces 1a of the both cutting residual pipe parts 1B through the upper opening 9a of the valve A and the upper case 9, that is, the shaft cores of both connection pipe parts 2 of the gate valve B are both cutting residual pipe parts. It carries in to the predetermined carrying-in position which becomes concentric or substantially concentric with the tube axis X of 1B.

  Next, when the operation screw shaft 42 is screwed among the feeder devices J assembled to both sides of the housing H in the tube axis X direction, the annular pressing plate 41 that is externally attached to the cutting remaining tube portion 1B. Is pushed and moved to the gate valve B side, and the joint ring 7 in contact therewith passes through the outer side in the radial direction of the anticorrosion cover 4 fitted and attached to the cut ends of the two cutting residual pipe portions 1B. It slides to the joint part which is externally connected to the connecting pipe part 2 of B.

  Thereafter, the working case 11 provided with the third lifting and lowering holding device G is removed from the upper connecting flange portion 10B of the working partition valve A on the housing H side, and the working partition plate valve A, both cases 8, 9 and the feeder are removed. After disassembling and removing the device J, the fixing bolts 46 inserted through the connecting plate portions 7C of the two joint rings 7 are locked to the lock nuts 47 so that the left and right joint rings 7 do not move due to the water pressure of the tap water. By tightening and fixing, the adjacent interval between the two joint rings 3 is fixed to the set mounting interval, and further, the separation prevention that prevents the relative disengagement movement of each of the joint rings 7 and the remaining cutting pipe portion 1B. Attach the bracket I.

  Further, with the fixing bolt 46 and the lock nut 47, the adjacent interval between the two joint rings 7 that are mounted across both the connecting pipe portions 2 and the cutting residual tube portion 1B of the gate valve B is set as a set mounting interval. An interval fixing means for maintaining is configured.

  The detachment prevention fitting I is a pair of semicircular upper and lower divided pressers having a locking portion 48a that can be engaged and disengaged from the outside in the radial direction with respect to a flange portion 7D that is formed to project from one end portion of the joint ring 7. 48 and a plurality of retaining members 49 that can bite into the outer peripheral surface of the cutting residual pipe portion 1B as main components, and connecting plates formed at both ends in the circumferential direction of both divided pressers 48 A bolt 50 and a nut 51 are provided over the portion 48b to fasten and fix the two divided pressers 48 to the reduced diameter side.

[Second Embodiment]
FIGS. 15 to 17 show an uninterrupted water gate valve installation method (an example of an uninterrupted flow type fluid device installation method) described in the first embodiment and an existing water pipe gate valve connection structure obtained by the method ( An example of an existing fluid pipe device connection structure is shown.
In the existing water pipe gate valve connection structure, the gate valve B is connected to the annular outer bottom surface 4c side of the bottom cover body 4C of the rust preventive cover 4 and to a portion corresponding to the inner cylindrical cover body 4B. An extended cylindrical cover portion 4E extending along the inner peripheral surface of the tube portion 2 is integrally formed, and a seal that seals between the outer peripheral surface of the extended cylindrical cover portion 4E and the inner peripheral surface 2b of the connecting tube portion 2 is provided. Means 53 are provided.

  The sealing means 53 is elastically applied to the inner peripheral surface 2b of the connecting pipe portion 2 at the distal end edge of the elastic cylindrical layer 53a and the extended cylindrical cover portion 4E at the entire outer peripheral surface of the extended cylindrical cover portion 4E. It is composed of an annular elastic seal protrusion 53b that is integrally protruded in a pressed state.

  Further, a fitting end portion of the cutting residual pipe portion 1B is fitted and attached to a portion corresponding to the boundary between the large diameter joint portion 7A and the small diameter joint portion 7B on the inner peripheral surface of the joint ring 7. It is a component of the rust prevention cover 4 and abuts the joint ring 7 to the gate valve B by coming into contact with the tips of the inner and outer cylindrical cover bodies 4A and 4B facing each other across the annular recess 4D from the tube axis X direction. An annular hooking portion 7E that can be pressed and moved toward the tube portion 2 is integrally formed.

Therefore, in the continuous water type gate valve installation method, the joint ring 7 attached to the cutting residual pipe portion 1B is relatively moved in the pipe axis X direction by the feeder device J provided in the housing H. When sliding to the joint region extending between the cutting remaining pipe portion 1B and the connecting pipe portion 2 of the gate valve B, the locking portion 7E provided in the joint ring 7 is in the middle of the sliding. The rust cover 4 is moved to the connection pipe part 2 side of the gate valve B, and the space between the inner peripheral surface 2b of the connection pipe part 2 is sealed by the sealing means 53 of the extended cylindrical cover part 4E of the rust prevention cover 4. After that, the housing H including the third elevating / holding device G, which is an example of the elevating device, and the work gate valve A, which is an example of the work valve, is removed.
Since the other steps are the same as those described in the first embodiment, the description thereof is omitted.

[Third Embodiment]
FIG. 18 shows an improvement of the uninterrupted water gate valve installation method (an example of an uninterrupted flow type fluid device installation method) described in the first embodiment, and the joint ring 7 includes the cutting residual pipe portion 1B. Fixing that is an example of a fixing means that comes into contact with the annular outer bottom surface 4c of the bottom cover body 4C of the rust preventive cover 4 fitted and attached to the cut end portion, and prevents the rust preventive cover 4 from being fixed in a fitted and attached state. A bolt 55 is screwed on.

When the joint ring 7 is at a predetermined joint position across the cutting residual pipe portion 1B and the connection pipe portion 2 of the gate valve B, the rust preventive fitted and attached to the cutting end portion of the cutting residual pipe portion 1B. The fixing bolts 55 are screwed from the outside in the radial direction to a plurality of circumferential positions in the intermediate portion of the joint ring 7 between the bottom cover body 4C of the cover 4 and the tip of the connection pipe portion 2 of the gate valve B. An internal thread portion 56 is formed so as to penetrate through, and an elastic seal layer 30a of the sealing means 30 on the inner surface side of the bottom cover body 4C of the rust preventive cover 4 is formed at the distal end portion of the fixing bolt 55 after cutting. A tapered surface 55a for pressing and moving to the cut end surface 1a of the placement tube portion 1B is formed, and further, between the head portion 55b of the fixing bolt 55 and the seat surface on the radially outer side of the female screw portion 56. A ring-shaped elastic sealing material 57 is provided.
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.

[Fourth Embodiment]
In each of the above-described embodiments, the cutting bit 3 is moved while being fed radially inward along the pipe circumferential direction at the planned cutting position that becomes the cut end surface 1a of both of the remaining cut pipe portions 1B, thereby providing an uninterrupted flow state. The cutting device C that cuts the pipe portion 1A to be cut and removed from the existing water pipe 1 as an example has been described as an example, but as shown in FIG. 19, a cylindrical blade body such as a hole saw is used as the tube axis. Alternatively, a method may be employed in which a part of the existing water pipe 1 is cut and separated into a cylindrical shape by feeding from a direction orthogonal to the direction.

In this case, as shown in FIG. 19, the cut end face 1a of both of the cut residual pipe portions 1B is formed in an arc shape along the rotational cutting locus P of the cylindrical blade body. The fitting margin L1 in the annular recess 4D of the anticorrosion cover 4 with respect to the cut end portion of the cut residual pipe portion 1B is made larger than the arcuate depth L3 on the cut end surface 1a of the cut residual pipe portion 1B. Only the construction is required, and the manufacturing cost can be reduced and the enforcement efficiency can be improved as compared with the case where the antirust cover 4 is formed in a shape corresponding to the shape of the cut end face 1a.
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 each of the above-described embodiments, the two connecting pipe portions 2 of the fluid device B and the left and right cut remaining pipe portions 1B are provided at portions located on both sides of the cut and removal planned pipe portion 1A of the existing fluid pipe 1. The joint ring 7 to be connected in a sealed state is mounted so as to be slidable in the tube axis X direction. The joint ring 7 is attached to both connecting pipe portions 2 of the fluid device B along the tube axis X direction. Further, the joint ring 7 may be divided into two in the direction of the pipe axis X, and one of the split joints may be installed on both sides of the existing fluid pipe 1 to be cut and removed. The other split joint ring is attached to both connecting pipe portions 2 of the fluid device B, and the two split joint rings are engaged with each other in a watertight state by relative proximity sliding. It may be configured.

  (2) As the cutting device C, the cutting and removal planned pipe portion 1A of the existing fluid pipe 1 may be cut and removed in the form of chips with a cutting tool such as an end meal.

  (3) In each of the above-described embodiments, a gate valve has been described as an example of the fluid device B. However, the fluid device B may be a T-shaped split joint, a three-way valve, or the like.

The partially cutaway side view of the gate valve connection structure of the existing water pipe which shows 1st Embodiment of this invention Enlarged cross-sectional view of the anti-rust cover Sectional view taken along line III-III in FIG. Whole cross-sectional side view showing the cutting removal process by the cutting device Overall cross-sectional side view at the end of the cutting process Overall cross-sectional side view when carrying in a cover mounting machine instead of a cutting device The enlarged front view of the cover mounting machine in the VII-VII line view of FIG. The partially cutaway side view of the cover mounting machine in the VIII-VIII line view of FIG. Overall cross-sectional side view when the cover mounting machine is placed in place Enlarged cross-sectional side view of a main part before fitting mounted rust cover Enlarged cross-sectional side view of a main part when the fitted and attached rust cover Enlarged cross-sectional side view of essential parts when an annular holding frame cover placement machine was detached from rust cover Cross-sectional side view of the whole when the gate valve is placed at a predetermined position Cross-sectional side view of the whole when the connection pipe part of the gate valve and the cutting residual pipe part are connected by a joint ring Sectional side view of the principal part when 2nd Embodiment of this invention is shown and a gate valve is arrange | positioned in a predetermined position Cross-sectional side view of the main part when the joint ring is moved halfway Cross-sectional side view of the main part when the joint ring is moved to the predetermined joint position The expanded sectional side view of the principal part which shows 3rd Embodiment of this invention Enlarged partially cutaway plan view of the main part showing a fourth embodiment of the present invention

Explanation of symbols

A Work valve (work gate valve)
B Fluidic equipment (switching valve)
C Cutting device E Cover mounting device F Lifting device (second lifting and holding device)
G Lifting device (third lifting and holding device)
H Housing J Feeder device L1 Fitting allowance L2 Opposite spacing X Pipe shaft core 1 Existing fluid pipe (existing water pipe)
1A Cutting / removal tube (cutting / removal tube)
1B Cutting and leaving pipe (cutting and leaving planned pipe)
1a Cutting end face 2 Connecting pipe part 2a End face 2b Inner peripheral face 4 Antirust cover 4A Outer cylindrical cover body 4B Inner cylindrical cover body 4D Annular recess 4E Extended cylindrical cover part 4a Tapered guide surface 4b Tapered guide surface 4c Annular Outer bottom surface 6 Cover holding portion 7 Joint ring 7E Locking portion 29 Moving guide surface 30 Sealing means 31 Sealing means (elastic seal material)
32 Sealing means (elastic sealing material)
53 Sealing means 55 Fixing means (fixing bolt)

Claims (6)

Between the two cutting residual pipe parts at the cutting point of the existing fluid pipe, both connecting pipe parts of the fluid device corresponding to the cutting and removing pipe part are arranged concentrically or substantially concentrically and face each other in the pipe axis direction. In the joint ring movable in the axial direction of the pipe connecting the cutting residual pipe part and the connecting pipe part of the fluid device, sealing means for sealing between the outer peripheral surface of the cutting residual pipe part and the It is an equipment connection structure of an existing fluid pipe provided with a sealing means for sealing between the outer peripheral surface of the connection pipe part,
The cutting end portion of each of the remaining cutting tube portions is provided with an annular recess that can be fitted in from the tube axis direction, and at least sealing means for sealing the cutting end surface of the cutting end portion is provided in the annular recess. The rust preventive cover provided for the fitting is fitted and mounted, and the fitting allowance with the cut end portion in the annular recess of the rust preventive cover is the annular end surface of the connecting pipe portion of the fluidic device and the rust preventive cover. The gap between the outer bottom surface and the connecting pipe portion of the fluid device is configured to be larger than the interval between the outer bottom surface in the tube axis direction, and further through the radially outer side of the anticorrosion cover. An existing fluid which is connected, and is provided with a fixing means for retaining and fixing the rust-proof cover fitted and attached to the cut end portion of the remaining cutting pipe portion in the fitted state. Equipment connection structure for pipes.   An annular outer bottom surface of the rust preventive cover is formed on a movement guide surface that moves and guides the fluid device to a predetermined mounting position between both cutting and leaving tube portions by contact with an end portion of the connection tube portion of the fluid device. The equipment connection structure for an existing fluid pipe according to claim 1.   The rust preventive cover is formed with an extended cylindrical cover portion extending along an inner peripheral surface of the connection pipe portion of the fluidic device, and an outer peripheral surface of the extended cylindrical cover portion and an inner peripheral surface of the connection pipe portion. The apparatus connection structure of the existing fluid pipe | tube of Claim 1 or 2 in which the sealing means which seals between is provided. In the inner cylindrical cover body of the rust preventive cover, a tapered guide surface having a larger diameter is formed at the opening side end portion of the inner peripheral surface of the outer cylindrical cover body of the rust preventive cover. The equipment connection structure for an existing fluid pipe according to any one of claims 1 to 3, wherein a tapered guide surface having a smaller diameter toward the tip end side is formed at an opening side end portion of the outer peripheral surface. This is a continuous flow type fluid equipment installation method in which a part of an existing fluid pipe is cut and removed in a sealed housing in a continuous flow state, and then a fluid equipment corresponding to the cut and removed pipe portion is connected. (6) A continuous flow type fluid equipment installation method, comprising the steps of 6).
1) Parts located on both sides of an existing fluid pipe to be cut and removed, or both connecting pipe parts of the fluid device, or both of them, and both connecting pipe portions of the fluid device and left and right cutting remaining pipe portions A housing with a working valve that can be opened and closed in a state of sealing the cutting work area of the existing fluid pipe is installed. .
2) The cutting and removal planned pipe portion of the existing fluid pipe is cut by the cutting device in the housing, and the cutting device is removed from the housing together with the cut and removed pipe portion.
3) An annular recess and at least a cutting end in which the cutting end of the cutting remaining pipe part can be fitted from the pipe axis direction in a cover holding part that is reciprocally movable in the pipe axis direction equipped in the cover mounting machine. A rust-proof cover provided with a sealing means for sealing the cut end surface of the part is mounted, and this cover mounting machine is held by the lifting device mounted on the housing, and the rust-proof cover is left and right after cutting. The cover mounting machine held by the elevating device is lowered to the cutting position of the existing fluid pipe until it reaches the concentric position or the substantially concentric position with the placement tube section.
4) The cover holding unit of the cover mounting machine is driven forward so that the rust preventive cover is fitted and mounted to the cut end of the remaining cutting pipe from the tube axis direction, and then the cover mounting machine Is removed from the housing.
5) The lifting device provided in the housing holds the fluid device, and until the both connecting pipe portions of the fluid device reach the concentric position or the substantially concentric position with the left and right cutting remaining tube portions, The fluid device held by the lifting device is lowered to the cutting position of the existing fluid pipe.
6) The cutting residual pipe part and the connecting pipe part of the fluid device that face each other in the pipe axis direction through the radially outer side of the rust preventive cover by the feeder device provided in the housing; Then, the housing including the lifting device and the work valve is removed. This is a continuous flow type fluid equipment installation method in which a part of an existing fluid pipe is cut and removed in a sealed housing in a continuous flow state, and then a fluid equipment corresponding to the cut and removed pipe portion is connected. (6) A continuous flow type fluid equipment installation method, comprising the steps of 6).
1) A joint ring for connecting the connecting pipe parts of the fluid device and the left and right cutting remaining pipe parts in a sealed state at portions located on both sides of the pipe part to be cut and removed of the existing fluid pipe, A housing having a work valve which is slidably mounted in the core direction and can be opened and closed in a state where the cutting work area of the existing fluid pipe is sealed is installed.
2) The cutting and removal planned pipe portion of the existing fluid pipe is cut by the cutting device in the housing, and the cutting device is removed from the housing together with the cut and removed pipe portion.
3) An annular recess and at least a cutting end in which the cutting end of the cutting remaining pipe part can be fitted from the pipe axis direction in a cover holding part that is reciprocally movable in the pipe axis direction equipped in the cover mounting machine. Rust preventive cover provided with a sealing means for sealing the cut end face of the part, and an extended cylindrical cover part having a sealing means for sealing between the inner peripheral surface of the connecting pipe part of the fluid device The cover mounting machine is held by the lifting device installed in the housing, and the lifting / lowering operation is performed until the anticorrosion cover reaches a concentric position or a substantially concentric position with the left and right cutting residual pipe portions. The cover mounting machine held by the apparatus is lowered to the cutting position of the existing fluid pipe.
4) The cover holding unit of the cover mounting machine is driven forward so that the rust preventive cover is fitted and mounted to the cut end of the remaining cutting pipe from the tube axis direction, and then the cover mounting machine Is removed from the housing.
5) Hold the fluid device in the lifting device mounted on the housing, and until both connecting pipe portions of the fluid device reach the concentric position or the substantially concentric position with the left and right cutting remaining tube portions, The fluid device held by the lifting device is lowered to the cutting position of the existing fluid pipe.
6) The cutting residual pipe part which is opposed to each other in the axial direction of the pipe axis through the radially outer side by connecting the joint ring attached to both of the cutting residual pipe parts by the feeder device provided in the housing. And the connecting portion of the fluid device are slid to the joint region, and the rust preventive cover is moved to the connecting portion of the fluid device by the engaging portion provided in the joint ring during the sliding. After sealing the space between the inner peripheral surface of the connecting pipe part with the sealing means of the extended cylindrical cover part of the rust preventive cover, the housing provided with the lifting device and the work valve is removed.

Images