JP6934670B2 - Valve installation device and sluice valve unit - Google Patents

Description

The present invention relates to a valve installation device for cutting and removing an existing pipe in a sealed space and installing a sluice valve at the removed portion, and a sluice valve unit for installing a sluice valve at the cut portion of the existing pipe.

As related to the above-mentioned valve installation device and sluice valve unit, Patent Document 1 includes a sluice valve body and valve operating means, as well as a sluice valve body and valve operating means in which an existing pipe (fluid transport pipe in the document) is provided with a piercing device. A technique is described in which a valve case is slidably mounted in a sealed state in the direction of the tube axis.

In the technique of Patent Document 1, the existing pipe (fluid transport pipe in the document) is perforated by the perforation device of the perforation work case, and then the sluice valve body is perforated to a position where the sluice valve body can be inserted into the perforation formed in the existing pipe. After sliding the work case and the valve case, the sluice valve can be installed in the existing pipe by fixing the valve case to the existing pipe.

In particular, in a state where the valve case is fixed to the existing pipe, the sluice valve body is brought into contact with the bottom of the existing pipe by inserting the sluice valve body into the existing pipe through a perforation formed in the existing pipe. It is configured so that the flow path of the existing pipe can be closed. Further, the drilling device can be removed from the existing pipe after the flow path can be closed by the sluice valve body.

In Patent Document 2, a valve box having a split structure is attached to an existing pipe, a part of the existing pipe is cut and removed inside the valve box, and a valve body is sent between the cut end faces of the existing pipe to form a valve box. The technique of fixing to the valve box in a state of being pressed against the valve seat of the inner wall is described.

When working with the technique of Patent Document 2, a cutting device is set inside the valve box arranged at a position surrounding the existing pipe, and a work housing extending upward from the upper part of the valve box is attached. become. In this technique, the existing pipe is cut by a cutting device, the cutting device and the cut existing pipe are taken out from the upper end of the working housing, and then the valve body is inside the valve box from the upper end of the working housing. Will be inserted.

In the technique of Patent Document 2, it is possible to control the flow rate of the fluid flowing through the existing pipe by setting the posture of the valve body.

Japanese Unexamined Patent Publication No. 2001-182887 Japanese Unexamined Patent Publication No. 2004-286228

In the technique described in Patent Document 2, a working housing is provided in the upper part of the valve box, and a sluice valve body slidably slidable in the horizontal direction is provided at the boundary between the valve box and the working housing. There were many, and it took time and effort to construct.

In particular, the technique described in Patent Document 2 has a configuration in which chips generated when cutting an existing pipe with a cutting device is discharged, but the inconvenience that chips stay at the bottom of the valve box cannot be eliminated. There was also a risk that chips would come into contact with the valve body and affect the water stopping performance.

Therefore, as described in Patent Document 1, it is conceivable to utilize the effectiveness of switching between the case for performing cutting and the case for providing a sluice valve by sliding movement. However, the technique of Patent Document 1 still has the inconvenience that chips flow into the existing pipe, and there is room for improvement.

For this reason, a valve installation device and a sluice valve unit that eliminate the influence of chips generated when cutting an existing pipe and obtain good water stopping performance are required.

The characteristic configuration of the valve installation device according to the present invention is a cutting case that forms a sealed space outside the existing pipe, a cutting mechanism that cuts a portion of the existing pipe that exists inside the cutting case, and the cutting mechanism. A cutting unit having a cutting mechanism for removing a portion cut by the above, a valve accommodating case forming a sealed space outside the existing pipe, and a sluice valve capable of opening and closing the flow path of the existing pipe are provided in the existing pipe. Among them, a valve installation unit having a valve installation mechanism for inserting a valve installation mechanism into the excised area excised by the cutting unit along the radial direction of the existing pipe, and the cutting unit and the valve installation unit along the existing pipe. It is provided with a moving unit for sliding and moving, and a storage space for accommodating chips generated during cutting by the cutting mechanism is formed at the bottom of the cutting case.

According to this characteristic configuration, among the existing pipes, the cutting unit is arranged at the position where the sluice valve is installed, the existing pipe is cut by the cutting mechanism, and the existing pipe cut by the cutting mechanism can be removed. After that, the moving unit moves the cutting unit and the valve installation unit along the existing pipe, the valve installation unit is placed at the position where the existing pipe is cut and removed, and the sluice valve is installed in the cutting area by the valve installation mechanism. It becomes possible to do. Further, in this feature configuration, unlike the configuration described in Patent Document 2, for example, a work housing and a sluice valve body are not required, so that the increase in size of each unit is suppressed and complicated work is required at the time of construction. Do not.

Further, in this characteristic configuration, chips generated when cutting the existing pipe by the cutting mechanism remain at the bottom of the cutting case, but a storage space for storing the chips is formed at the bottom of the cutting case. Therefore, it is possible to eliminate the inconvenience that chips adhere to the outer periphery of the existing pipe and the cut portion. Further, in this configuration, when the sluice valve is arranged, the cutting case is moved to a position outside the position where the sluice valve is arranged, so that chips do not adversely affect the performance of the sluice valve. ..
In this way, a valve installation device that eliminates the influence of chips generated when cutting the existing pipe and obtains good water stopping performance is configured.

As another configuration, the relative distance of the inner wall surface of the storage space facing the existing pipe in the direction along the conduit is longer than the cutting length of the existing pipe cut by cutting the cutting mechanism, and this cutting is performed. The length may be set longer than the facing distance between the inner end faces of the pair of sleeve portions that embrace the outer periphery of the existing pipe in the valve accommodating case.

According to this, since the relative distance of the inner wall surface of the storage space in the direction along the pipeline of the existing pipe is longer than the cutting length of the part of the existing pipe cut by the cutting mechanism, the cutting mechanism inside the cutting case. The existing pipe can be cut without difficulty. Since the cutting length is set longer than the facing distance between the inner end faces of the pair of sleeves that embrace the existing pipe in the valve accommodating case, when the valve accommodating case is placed at a position overlapping the cutting area of the existing pipe. , Each of the pair of cut ends of the existing pipe can be set in a positional relationship so as not to be exposed inside the inner end surface of the corresponding sleeve portion. By setting the cut end of the existing pipe so as not to be exposed inward from the inner end surface of the sleeve, for example, when the sluice valve is installed by the valve installation mechanism, the flange of the sluice valve is sleeved. It is also possible to make good contact with the inner end surface of the portion so that the sluice valve can be installed well.

As another configuration, the valve accommodating case has a pair of sleeve portions that embrace the outer periphery of the existing pipe, and the sluice valve has a flange portion that contacts the inner end surfaces of the pair of sleeve portions. A sealing material may be arranged between the inner end surface and the flange portion.

According to this, when arranging the sluice valve in the cutting area of the existing pipe, the flange portion of the sluice valve is brought into contact with the inner end surface of the sleeve portion that embraces the outer circumference of the existing pipe in the valve accommodating case, and the sleeve portion is formed. The sealing material placed between the inner end surface of the and the flange portion can surely prevent the leakage of the fluid.

As another configuration, each flange surface of the pair of the flange portions is formed on an inclined surface that becomes narrower toward the lower side in the insertion direction when the sluice valve is installed by the valve installation mechanism, and the flange surface is formed. The inner end surface of the sleeve portion facing the flange surface may be set to an inclined posture along the flange surface.

According to this, when installing the sluice valve, the flange surface formed as an inclined surface by simply moving the sluice valve along a preset insertion direction by the valve installation mechanism, and the inclined posture along the inclined surface. It is possible to bring the formed inner end surface into close contact with the formed inner end surface.

The characteristic configuration of the sluice valve unit according to the present invention is a valve accommodating case that forms a sealed space that seals a space including the cut area on the outside of an existing pipe having a cut area removed by cutting, and a flow of the existing pipe. The sluice valve comprises a sluice valve inserted into the cut region to allow opening and closing of the path, the valve accommodating case has a pair of sleeves that embrace the outer periphery of the existing pipe, and the sluice valve. It has a flange portion that comes into contact with the inner end surfaces of the pair of sleeve portions, and a sealing material is arranged between the inner end surface and the flange surface of the flange portion.

According to this characteristic configuration, when the valve accommodating case creates a sealing space for sealing the area including the excision area of the existing pipe and the sluice valve is installed inside the valve accommodating case by the valve installation mechanism, the valve accommodating case The flange surface of the sluice valve flange is brought into contact with the inner end surface of the sleeve that embraces the outer circumference of the existing pipe, and the sealing material is sandwiched between the inner end surface and the flange surface, causing leakage of fluid flowing through the existing pipe. Can be suppressed.
In this way, the sluice valve unit that obtains good water stopping performance is configured.

As another configuration, the flange portion is formed on an inclined surface whose width becomes narrower toward the lower side in the insertion direction of the sluice valve, and the inner end surface of the sleeve portion facing the flange surface of the flange portion is the said. It may be set to an inclined posture along the flange surface.

According to this, when installing the sluice valve, the sluice valve is simply moved along a preset insertion direction by the valve installation mechanism, and the flange surface formed as an inclined surface and the inclined posture along the inclined surface are obtained. It is possible to bring it into close contact with the inner end surface formed by.

As another configuration, in order to fix the sluice valve to the valve accommodating case, a fixture that comes into contact with the sluice valve by being inserted from the outside of the valve accommodating case may be provided.

According to this, by inserting the fixture from the outside of the valve accommodating case with the sluice valve inserted in the excision region, the fixture comes into contact with the sluice valve and the sluice valve can be fixed inside the valve accommodating case.

As another configuration, an outer peripheral seal extending over the inner circumference of the outer end portion of the sleeve portion and the outer circumference of the existing pipe may be provided, and a push ring for crimping the outer peripheral seal to the outer circumference of the existing pipe may be provided.

According to this, the outer peripheral seal is crimped to the outer periphery of the existing pipe by the force acting from the push ring, and the sleeve portion is fixed to the existing pipe by the pressure acting from the outer peripheral ring. As a result of this fixing, the valve accommodating case can be fixed to the existing pipe.

It is a figure which shows the state which arranged the center frame etc. in the existing pipe in the pit. It is a figure which shows the state which arranged the cutting unit and the valve installation unit in the existing pipe in the pit. It is sectional drawing which shows the cutting mechanism inside a cutting unit. It is sectional drawing which shows the arrangement of the drive chain of a cutting unit and the like. It is a figure which shows the state which cut a part of the existing pipe with a cutting unit inside a pit. It is a figure which shows the state which arranged the valve installation unit in the cutting area in a pit. It is a figure which shows the state which removed the cutting unit from the existing pipe in the pit. It is sectional drawing which shows the dimensional relationship of a cutting area and a sluice valve. It is a figure which shows the state which inserted the sluice valve into the cutting area inside a pit. It is sectional drawing which shows the structure which fixes a sluice valve to a valve accommodating case. It is a figure which shows the state which the sluice valve is fixed to the existing pipe in the pit. It is sectional drawing which shows the structure of the cutting operation part, and the cutting blade in the position before cutting. It is sectional drawing which shows the structure of the cutting operation part, and the cutting blade at the time of cutting. It is sectional drawing which shows the structure of the star foil of a cutting operation part, and the contact member. It is sectional drawing which shows the state which the actuating member was displaced by contact with a star foil and a contact member. It is a figure which shows the structure of the sluice valve of another embodiment (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIG. 2, a cutting unit A that cuts and removes a part of the existing pipe 1 and a valve installation unit B (partition) that installs a sluice valve V for the existing pipe 1 at a portion that is partially removed by cutting. An example of a valve unit) and a moving unit C for sliding and moving these along the existing pipe 1 are provided to form a valve installation device S.

This valve installation device S assumes a water pipe as the existing pipe 1, and does not block water as a fluid flowing through the existing pipe 1 (while maintaining the state in which water flows), and determines the existing pipe 1. A sluice valve V that can block the flow of water is installed in the cut area R (see FIGS. 5 to 8).

In order to realize this construction, as shown in FIG. 1, a pit 2 for exposing the existing pipe 1 is formed on the ground by excavation. In the pit 2, a bottom wall 3 is formed of concrete, and a protective wall 4 is provided inside the pit 2 with concrete near both ends of the existing pipe 1. The protective wall 4 may be a band-shaped protective wall 4 as long as it fixes the existing pipe 1.

Further, when installing the sluice valve V, as shown in FIG. 2, a cutting unit A is provided at a position where the sluice valve V is installed among the existing pipes 1 exposed inside the pit 2, and is adjacent to the existing pipe 1. A valve installation unit B is provided at the position and these are connected to each other.

That is, the cutting case 11 of the cutting unit A is provided so as to be slidable along the longitudinal direction of the existing pipe 1, and the valve accommodating case 21 of the valve installation unit B is provided so as to be slidable along the longitudinal direction of the existing pipe 1. Be done. Further, as shown in FIG. 2, the cutting case 11 and the valve accommodating case 21 are connected by bolts. Further, when the cutting unit A is provided in the existing pipe 1, a caster 5 is provided between the bottom surface of the cutting case 11 and the bottom wall 3 of the pit 2.

The cutting case 11 has a structure for forming a sealed space on the outside of the existing pipe 1, and has a cutting mechanism 13, a driving mechanism 14, and a shaft 15 as a cutting mechanism inside. The valve accommodating case 21 has a structure for forming a sealed space on the outside of the existing pipe 1, has a sluice valve V inside, and inserts the sluice valve V into the cutting region R (see FIGS. 5 to 8). It has a shaft-shaped body 25 as a valve installation mechanism.

The moving unit C is configured as a mechanism for applying a sliding force to the cutting case 11 and the valve accommodating case 21. Although the specific structure is not shown in the drawing, it is similar to a hydraulic cylinder that applies a sliding force, an electric cylinder that applies a sliding force, or a winch that applies a sliding force by winding a wire or chain. It has a structure to be used.

From such a configuration, as shown in FIG. 5, a part of the existing pipe 1 is cut by the cutting unit A, and the cut existing pipe 1 is moved upward inside the cutting case 11 by the operation of the shaft 15. Become. The region where the cut existing pipe 1 is cut is referred to as a cut region R, and the region of the existing pipe 1 adjacent to the cut region R is referred to as a residual pipe portion 1a.

Next, as shown in FIG. 6, the valve installation unit B is set in the cutting region R of the existing pipe 1 by the sliding force acting from the moving unit C. Specifically, the valve installation unit B is arranged in a region that straddles the pair of remaining pipe portions 1a at a position that overlaps with the excision region R. When moving by the moving unit C, the cutting unit A and the valve installation unit B move integrally, and the caster 5 assists this movement.

After this movement, as shown in FIG. 7, the cutting unit A is disassembled and removed, and in order to hold the position of the valve installation unit B, between the bottom surface of the valve accommodating case 21 and the bottom wall 3 of the pit 2. The support frame 26 is arranged. In this state, as shown in FIG. 9, the sluice valve V is inserted into the cut area R of the existing pipe 1 by the valve installation unit B, the valve accommodating case 21 of the valve installation unit B is fixed to the existing pipe 1, and the valve accommodating case 21. The sluice valve V is fixed inside.

Further, after confirming that there is no water leakage from the existing pipe 1 into the valve accommodating case 21 in this state, the upper valve case 21c (see FIG. 8) of the valve accommodating case 21 is removed. After that, as shown in FIG. 11, the installation of the sluice valve V is completed by connecting and fixing the fixing plate 21d to the upper surface of the intermediate valve case 21b.

The details of the cutting unit A and the valve installation unit B will be described below.

[Cut unit]
As shown in FIGS. 2 to 4, the cutting unit A includes a cutting case 11 that forms a sealed space on the outer periphery of the existing pipe 1, and a center frame that is arranged at a position that surrounds the existing pipe 1 inside the cutting case 11. 12, a pair of cutting mechanisms 13 for cutting the existing pipe 1, a drive mechanism 14 for driving the pair of cutting mechanisms 13, and a shaft 15 for raising and lowering the pair of cutting mechanisms 13 and the drive mechanism 14 inside the cutting case 11. It is configured with and.

As shown in FIG. 3, the cutting case 11 is provided on the lower cutting case 11a arranged on the lower side of the existing pipe 1, the intermediate cutting case 11b arranged on the upper side of the existing pipe 1, and the upper side of the intermediate cutting case 11b. It has a structure that creates a sealed space on the outer periphery of the existing pipe 1 by superimposing and connecting the upper cutting case 11c forming a large space.

The cutting case 11 includes a pair of tubular portions 11T that are in a posture along the pipe axis P so as to embrace the existing pipe 1. In the tubular portion 11T, a portion in which a semicircular concave portion is formed on the lower side in the lower cutting case 11a and a portion in which a semicircular concave portion is formed on the upper side in the intermediate cutting case 11b are overlapped from above and below. When combined, it is formed into a cylindrical shape. Further, a sealing material 11Ts is provided on the inner circumference of the pair of tubular portions 11T.

The center frame 12 is provided with a horizontal regulation plate 12a at the bottom thereof and a plurality of regulation protrusions 12b protruding downward from the lower surface of the regulation plate 12a. Further, the inner surface of the bottom wall of the lower cutting case 11a is provided with a support plate 11d that abuts on the regulation plate 12a, and the support plate 11d is formed with a regulation hole portion 11e into which the regulation protrusion 12b is fitted.

Since the center frame 12 is supported by the shaft 15 so as to be able to move up and down, when the center frame 12 is in the lowered position (when the cutting mechanism 13 is in the cuttable position), the regulation plate 12a hits the support plate 11d. The position in the vertical direction is determined by the contact, and the position in the horizontal direction is determined by fitting the regulation protrusion 12b into the regulation hole portion 11e. Further, because of such a positioning structure, the shaft 15 allows the center frame 12 to move upward.

The center frame 12 has a structure that rotatably supports the rotating frame 13a, and the rotating frame 13a is formed of a sprocket wheel having a disk shape by connecting two members with a plurality of bolts or the like.

The pair of cutting mechanisms 13 are arranged at positions where the center frame 12 is sandwiched from the longitudinal direction of the existing pipe 1. Each cutting mechanism 13 includes a pair of rotating frames 13a that are rotatably supported around a rotating shaft core centered on a pipe shaft core P.

The pair of cutting mechanisms 13 are configured to cut the existing pipe 1 on a cutting surface that is orthogonal to the pipe axis P. For example, each cutting surface of the remaining pipe portion 1a. The cutting posture of the pair of cutting mechanisms 13 may be set so that the distance between the upper end portions of the above is larger than the distance between the lower end portions. When the cutting posture is set in this way, when the existing pipe 1 is taken out upward from the cut portion, contact with the remaining pipe portion 1a is suppressed to facilitate upward lifting.

As shown in FIGS. 3 and 12 to 15, the pair of rotating frames 13a are supported by the guide frame 13F formed on the outer surface and the guide frame 13F so as to be slidably movable in the radial direction of the existing pipe 1. It includes an operating member 13b and a cutting blade 13c fixed to the operating member 13b. Further, the rotating frame 13a is provided with a pair of cutting operating portions 13d that bring the cutting blade 13c close to the pipe axis P integrally with the operating member 13b as each rotating frame 13a rotates.

A cutting tool used for cutting or the like is used for the cutting blade 13c, and a guide groove 13g is formed in the guide frame 13F in a posture along the radial direction of the existing pipe 1, and the operating member is movable with respect to the guide groove 13g. 13b is supported. The cutting operating portion 13d brings the cutting blade 13c close to the pipe axis P together with the operating member 13b when the rotating frame 13a rotates in a predetermined direction, and the cutting blade together with the operating member 13b when the rotating frame 13a rotates in the opposite direction. It enables the operation of separating the 13c from the existing pipe 1.

As shown in FIGS. 12 to 15, the cutting operation unit 13d drives the shift shaft 16 in a posture along the radial direction of the existing pipe 1 and a posture parallel to the pipe axis P in a positional relationship different from the shift shaft 16. It includes a shaft 17. The shift shaft 16 and the drive shaft 17 are supported by an outer peripheral portion of the rotating frame 13a. A male screw portion is formed on the shift shaft 16, and a female screw portion of the operating member 13b is screwed into the male screw portion.

The drive shaft 17 is provided with a worm gear 17a, and the shift shaft 16 is provided with a wheel gear 16a that meshes with the worm gear 17a. Further, a star wheel 18 is provided on the inner end side (the side closer to the center frame 12) of the drive shaft 17. Further, the outer surface of the center frame 12 is provided with a pair of contact members 19 that come into contact with the tooth portions 18a of the star wheel 18 as the rotating frame 13a rotates.

By configuring the cutting operation portion 13d in this way, when the rotating frame 13a rotates, the drive shaft 17 rotates by a predetermined angle each time the tooth portion 18a of the star wheel 18 abuts on the abutting member 19. Let me. Along with this rotation, the rotational force of the worm gear 17a is transmitted to the wheel gear 16a to rotate the shift shaft 16. By this rotation, the cutting blade 13c is brought into contact with the pipe shaft core P together with the operating member 13b screwed into the male screw portion of the shift shaft 16, and the existing pipe 1 is cut.

As shown in FIGS. 3 and 4, the drive mechanism 14 is arranged at a position along the outer periphery of the drive case 14a to which the driving force of the electric motor is transmitted, the drive sprocket 14b provided on the outer surface of the drive case 14a, and the rotating frame 13a. A pair of driven sprockets 14d and a drive chain 14c wound around them are provided.

In this drive mechanism 14, the drive chain 14c is wound around the drive sprocket 14b and the pair of driven sprockets 14d, and the tooth portion on the outer periphery of the rotating frame 13a is provided on the intermediate drive chain 14c of the pair of driven sprockets 14d. The positional relationship is set so as to occlude. As a result, the drive chain 14c is circulated by the drive force of the drive sprocket 14b, and the drive rotation of the rotating frame 13a is realized by the drive force of the drive chain 14c at the intermediate position of the pair of driven sprockets 14d.

As shown in FIGS. 2, 5 and 6, the shaft 15 constituting the cutting mechanism includes a shaft 15 connected to the drive case 14a. The shaft 15 is arranged so as to vertically penetrate the upper wall of the upper cutting case 11c of the cutting case 11. The shaft 15 enables an operation of lifting a part of the cut existing pipe 1 upward from the existing pipe 1 by an ascending operation. In particular, the cutting mechanism does not function only on the shaft 15, but includes a pair of rotating frames 13a arranged at a position to embrace a part of the cut existing pipe 1 and a center frame 12 for supporting the rotating frame 13a. ..

It is also possible to house the drive shaft 17 inside the shaft 15 and rotationally drive an electric motor provided outside to form a cutting mechanism.

[Valve installation unit]
As shown in FIGS. 2, 5, 6 and 8, the valve installation unit B is a specific example of the sluice valve unit. The valve installation unit B has a valve accommodating case 21 that forms a sealed space on the outside of the existing pipe 1 and a sluice valve V that can open and close the flow path of the existing pipe 1 in the radial direction of the existing pipe 1 with respect to the cutting region R. It is configured to include a shaft-shaped body 25 (an example of a valve installation mechanism) to be inserted along the shaft.

As shown in FIG. 8, the valve accommodating case 21 includes a lower valve case 21a (an example of a first valve case) arranged below the existing pipe 1 and an intermediate valve case 21b arranged above the existing pipe 1. It has a structure in which (an example of a second valve case) and an upper valve case 21c that forms a large space on the upper side by connecting to the upper part of the intermediate valve case 21b are overlapped and connected.

The valve accommodating case 21 includes a pair of sleeve portions 21T that are in a posture along the pipe axis P so as to embrace the existing pipe 1. In the sleeve portion 21T, a portion of the lower valve case 21a having a semicircular recess formed on the lower side and a portion of the intermediate valve case 21b having a semicircular recess formed on the upper side are overlapped from above and below. It is formed into a cylindrical shape.

Of the valve accommodating case 21, the inner end 22 of the sleeve, which is the inner end of the sleeve portion 21T, protrudes inside the valve accommodating case 21, and the outer end 23 of the sleeve, which is the outer end of the sleeve portion 21T, protrudes outside the valve accommodating case 21. There is. In the sleeve portion 21T, the protruding length of the sleeve outer end 23 is longer than the protruding length of the sleeve inner end 22, and a seal body 24 is provided on the inner circumference of each sleeve outer end 23.

The sluice valve V includes a valve body 31 that houses a valve body that enables opening and closing of the flow path, a shaft support portion 32 that projects upward from the valve body 31, and a flow path that is arranged coaxially with the existing pipe 1. It has a structure in which the portion 33 is integrally formed. Further, screw holes 31a into which fixing bolts 34 (see FIG. 10) as fixing tools are screwed are formed on both side surfaces of the valve body 31.

As shown in FIG. 8, flange portions 33a are integrally formed at the outer ends of the respective flow path portions 33, and the flange surfaces 33s of these flange portions 33a are narrower toward the lower side in the insertion direction of the sluice valve V. It is formed as an inclined surface. Further, the flange surface 33s is provided with an annular sealing member 35 made of an O-ring.

Further, the inner end surface 22s of the sleeve inner end 22 of the sleeve portion 21T is formed as an inclined surface having a posture parallel to the flange surface 33s of the flange portion 33a.

A shaft-shaped body 25 as a valve installation mechanism extends upward from the upper end of the shaft support portion 32 of the sluice valve V. The shaft-shaped body 25 is configured to be moved in the vertical direction by a driving force from an external driving unit of the valve accommodating case 21, and the sluice valve V is inserted into the cutting region R by moving downward.

[Dimensional relationship of valve installation device]
In the valve installation device S having this configuration, as shown in FIG. 3, a storage space 11s for accommodating chips generated when the existing pipe 1 is cut by the cutting mechanism 13 is formed at the bottom of the cutting case 11 (lower cutting case 11a). Has been done. Of the inner wall surface of the storage space 11s, the distance facing the existing pipe 1 in the direction along the pipeline is defined as the relative distance L0. The interval between the cut surfaces when the existing pipe 1 is cut by the cutting mechanism 13 is defined as the cutting length L1.

Further, as shown in FIG. 8, among the pair of sleeve portions 21T formed in the valve accommodating case 21, the opposite sleeve inner ends 22 among the inner end surfaces 22s, the longest distance portion (upper inner end surface). The distance between 22s) is defined as the facing distance L2. Further, the distance between the seal bodies 24 provided on the inner circumference of each sleeve portion 21T is set as the seal distance L3.

In particular, the dimensional relationship is set so that L0> L3> L1> L2. That is, since the seal interval L3 is longer than the cutting length L1, when the valve installation unit B is arranged in the cutting area, the sealing body 24 is arranged on the outer peripheral surface of the remaining pipe portion 1a, and water from the cutting area R is provided. Leakage can be prevented by the seal body 24.

Further, since the cutting length L1 is longer than the facing distance L2, the position where the remaining pipe portion 1a is not exposed inward from the inner end surface 22s of the sleeve inner end 22 in a state where the valve installation unit B is arranged at a position overlapping the cutting region. Can be in a relationship. As a result, the sluice valve V can be arranged at an appropriate position while avoiding the inconvenience that the remaining pipe portion 1a comes into contact with the flange portion 33a of the sluice valve V.

[Construction process]
When the sluice valve V is installed in the existing pipe 1 by the valve installation device S having this configuration, as shown in FIG. 1, a pit 2 is formed by excavating the ground to expose the existing pipe 1, and the pit 2 is formed. A center frame 12 is assembled at a position where a sluice valve V is installed in the existing pipe 1 exposed inside, a pair of cutting mechanisms 13 are assembled so as to be supported by the center frame 12, and a drive mechanism 14 is further assembled on the center frame 12. Support.

Next, as shown in FIGS. 2 and 3, the lower cutting case 11a is arranged on the lower side of the existing pipe 1, the intermediate cutting case 11b is arranged on the upper side of the existing pipe 1, and these are connected to form a pair. The tubular portion 11T is in a state of embracing the existing pipe 1. Then, the cutting case 11 is assembled by placing the upper cutting case 11c on the upper surface of the intermediate cutting case 11b and connecting them.

As a result, a sealing space is formed on the outside of the existing pipe 1 by the cutting case 11, and the center frame 12, the cutting mechanism 13, the drive mechanism 14, and the shaft 15 (cutting mechanism) are accommodated in the sealed space. The cutting unit A in which the above is arranged is completed. When the lower cutting case 11a is arranged below the existing pipe 1, the regulation plate 12a provided on the lower surface of the center frame 12 and the support plate 11d provided on the inner wall of the bottom surface of the lower cutting case 11a come into contact with each other. Positioning is performed by fitting the regulation protrusion 12b into the regulation hole portion 11e. At the time of this assembly, a caster 5 is provided on the lower surface of the cutting case 11.

After that, as shown in FIGS. 2 and 8, the valve installation unit B is assembled at a position adjacent to the cutting unit A in a watertight state. Specifically, by arranging the lower valve case 21a below the existing pipe 1 and arranging the intermediate valve case 21b above the existing pipe 1 and connecting them, the pair of sleeve portions 21T becomes the existing pipe 1 Will be in a state of embracing. Then, the sluice valve V is housed in the upper valve case 21c in advance, and the upper valve case 21c is placed on the upper surface of the intermediate valve case 21b and connected to complete the valve installation unit B.

With the cutting unit A and the valve installation unit B completed, the cutting case 11 and the valve accommodating case 21 are connected. Further, the moving unit C is arranged at a required place.

[Construction process: cutting and cutting]
After the valve installation device S is properly installed in this way, cutting by the cutting mechanism 13 is started. When cutting in this way, the pair of rotating frames 13a of the cutting mechanism 13 rotate about the tube axis P by rotating the drive sprocket 14b of the drive case 14a of the drive mechanism 14 in a predetermined direction.

Further, when the rotating frame 13a rotates in a predetermined direction, as the rotating frame 13a rotates, the cutting operating portion 13d cuts with the cutting blade 13c in order to bring the cutting blade 13c close to the pipe axis P together with the operating member 13b. The amount is increased and the existing pipe 1 is cut.

After the cutting is completed, the cutting mechanism 13 and the driving mechanism 14 are moved upward by the shaft 15, so that the cut portion of the existing pipe 1 is moved upward together with the center frame 12 as shown in FIG. As described above, since the cutting mechanism includes a pair of rotating frames 13a and a center frame 12 supporting the shaft 15 in addition to the shaft 15, the existing pipe 1 is cut by moving the shaft 15 upward. The parts that have been made move upward integrally with these.

By cutting the existing pipe 1 cut in this way, a cut region R is created in the existing pipe 1 as shown in FIG. The interval between the excision regions is the excision length L1.

[Construction process: Installation of sluice valve]
After cutting the existing pipe 1, the cutting unit A and the valve installation unit B are moved along the existing pipe 1 by the driving force of the moving unit C, and the valve installation unit B is moved to the cutting region R as shown in FIG. Place them in overlapping positions.

In the situation where the valve installation unit B is arranged in this way, as shown in FIG. 8, since the cut length L1 is shorter than the seal interval L3, the seal body 24 is brought into contact with the outer periphery of each of the pair of remaining pipe portions 1a. Allows sealing. Further, since the cutting length L1 is longer than the facing distance L2, the end portion of the remaining pipe portion 1a is not exposed inward from the inner end of the sleeve inner end 22.

After arranging the valve installation unit B in this way, the cutting unit A is disassembled and removed from the existing pipe 1 as shown in FIG. 7, and the bottom surface of the valve accommodating case 21 and the bottom wall 3 of the pit 2 are connected. A support frame 26 is arranged between them. In this state, as shown in FIG. 8, a flexible outer peripheral seal 41 such as rubber is inserted into the gap between the pair of sleeve outer ends 23, and further, as a push ring that regulates the outward displacement of the outer peripheral seal 41. The pressing ring 42 is arranged on the outer surface of the existing pipe 1 (remaining pipe portion 1a), and the existing pipe 1 is tightened and fixed by a plurality of fastening bolts 43.

By operating the shaft-shaped body 25 with the positional relationship set in this way, the sluice valve V is lowered as shown in FIG. 9 and inserted into the excision region R. As shown in FIG. 8, the flange portions 33a formed at the outer ends of the pair of flow path portions 33 of the sluice valve V are narrower toward the lower side in the insertion direction of the sluice valve V (lower side in the figure). It is formed as an inclined surface. Further, the inner end surface 22s of the sleeve inner end 22 of the sleeve portion 21T formed in the valve accommodating case 21 is formed as an inclined surface having a posture parallel to the flange surface 33s of the flange portion 33a.

As a result, when the sluice valve V is inserted into the cutting region R, the flange surfaces 33s of the pair of flange portions 33a can be brought into close contact with the inner end surface 22s of the corresponding sleeve portion 21T on the entire circumference. Will be. In particular, since the flange portion 33a is provided with the annular seal member 35, the sluice valve V can be provided in a state where water leakage does not occur.

With the sluice valve V provided in this way, as shown in FIG. 10, a fixing bolt 34 inserted from the outside of the valve accommodating case 21 into each of the pair of screw holes 31a of the valve body 31 (an example of a fixture). Is screwed in, and the sluice valve V is fixed to the valve accommodating case 21.

As a fixture, the sluice valve V may be fixed to the valve accommodating case 21 by inserting a fixing pin or the like from the outside of the valve accommodating case 21. The valve accommodating case 21 is formed with a through hole for inserting the fixing bolt 34, and this through hole is closed by the lid until the fixing bolt 34 is inserted.

After fixing the sluice valve V to the valve accommodating case 21 in this way, after confirming that there is no water leakage from the existing pipe 1 into the valve accommodating case 21, the upper valve case 21c is moved from the intermediate valve case 21b. Removal, the upper end portion of the shaft support portion 32 of the sluice valve V is removed to expose the operating shaft of the valve body of the sluice valve V. Then, as shown in FIG. 11, the fixing plate 21d is connected and fixed to the intermediate valve case 21b instead of the upper valve case 21c. This completes the installation of the sluice valve V.

[Action and effect of the embodiment]
In the valve installation device S configured in this way, the existing pipe 1 is provided with a cutting unit A and a valve installation unit B, and these are configured to be movable by the moving unit C, so that the cutting unit A can be used to connect the existing pipe 1 to the existing pipe 1. A part can be excised to form an excision region R formed thereby. After cutting in this way, the cutting unit A and the valve installation unit B are moved along the existing pipe 1 by the driving force of the moving unit C, the valve installation unit B is arranged at a position overlapping the cutting region R, and the partition is formed. The operation of inserting and fixing the valve V can be performed while maintaining the state in which water flows through the existing pipe 1.

In particular, in this valve installation device S, chips generated when the existing pipe 1 is cut by the cutting mechanism 13 are stored in the bottom of the cutting case 11, and the storage position is largely separated downward from the existing pipe 1. When the cutting unit A and the valve installation unit B are moved along the existing pipe 1, chips adhere to the outer surface of the existing pipe 1 and the inside of the existing pipe 1 is removed from the excision region R. It eliminates the inconvenience of invading the sluice valve V and does not affect the opening / closing performance of the sluice valve V.

Further, in this valve installation device S, the flange surface 33s of the flange portion 33a is formed as an inclined surface whose width becomes narrower toward the lower side in the insertion direction, and the sleeve inner end 22 of the sleeve portion 21T formed in the valve accommodating case 21. The inner end surface 22s is formed as an inclined surface having a posture parallel to the flange surface 33s of the flange portion 33a. Therefore, the sluice valve V can be reliably inserted, the flange surface 33s and the inner end surface 22s are brought into proper contact with each other, and the sealing member 35 satisfactorily prevents water leakage.

The valve installation unit B (sluice valve unit) accommodates the sluice valve V in advance and is arranged at a position overlapping the cutout region R in which a part of the existing pipe 1 is cut. The V can be easily inserted into the excision region R and fixed.

[Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiment (those having the same functions as those in the embodiment are designated by the same numbers and reference numerals as those in the embodiment).

(A) As shown in FIG. 16, as the sluice valve V, a flange having a tapered surface formed on the outer surface side with respect to the flange surface 33s in which the flange portion 33a at the outer end portion of the flow path portion 33 is in a non-tilted posture. The member 36 is fixed, and the flange surface 36s of the flange member 36 is formed.

In this other embodiment (a), the sluice valve V having the flange surface 33s inclined to the outer end of the flow path portion 33 is not specially manufactured. For example, in the ready-made sluice valve V, the flow path portion 33 By attaching the flange member 36 to the outer end of the flange portion 33a, it is possible to create a sluice valve V having a flange surface 36s in an inclined posture.

(B) As the cutting mechanism 13, a hole saw or the like that forms a hole having a diameter larger than the outer diameter of the existing pipe 1 is used. By configuring the cutting mechanism 13 in this way, it is possible to create the cutting region R, and the structure of the cutting mechanism 13 can be simplified.

Further, when the cutting mechanism 13 is configured in this way, a plurality of holes are drilled at positions adjacent to each other along the pipe axis P or at positions adjacent to each other along the tube axis P in a direction orthogonal to the tube axis P. It is conceivable to set the cutting form. By performing a plurality of perforations in this way, it is not necessary to use a hole saw having an excessive diameter.

(C) In the valve installation unit B, the insertion direction of the sluice valve V by the shaft-shaped body 25 is set so that the sluice valve V is inserted into the cutting region R of the existing pipe 1 from the lateral direction.

(D) As the sluice valve V, a sluice valve V having a structure in which the postures of the flange surfaces formed on both side portions of the valve body 31 are orthogonal to the pipe axis P of the existing pipe 1 is used. As a result, ready-made products can be used as the sluice valve V, and the construction cost can be reduced. Further, a switching valve may be used as the sluice valve V.

The present invention can be used for a valve installation device and a sluice valve unit for providing a sluice valve on an existing pipe.

1 Existing pipe 11 Cutting case 11s Storage space 13 Cutting mechanism 15 Shaft (cutting mechanism)
21 Valve accommodating case 21T Sleeve part 22s Inner end surface 25 Valve installation mechanism 33a Flange part 33s Flange surface 34 Fixing bolt (fixing tool)
35 Sealing material 41 Outer peripheral seal 42 Pressing ring (pushing ring)
A Cutting unit B Valve installation unit (sluice valve unit)
C Moving unit R Cutting area V Gate valve L0 Relative distance L1 Cutting length L2 Opposing distance

Claims (8)

A cutting case that forms a sealed space on the outside of the existing pipe, a cutting mechanism that cuts a portion of the existing pipe that exists inside the cutting case, and a cutting mechanism that removes the portion cut by the cutting mechanism. With a cutting unit
A valve accommodating case that forms a sealed space on the outside of the existing pipe and a sluice valve that can open and close the flow path of the existing pipe are provided in the existing pipe with respect to the cutting region cut by the cutting unit. A valve installation unit having a valve installation mechanism that is inserted along the radial direction, and a valve installation unit.
A moving unit for sliding and moving the cutting unit and the valve installation unit along the existing pipe is provided.
A storage space is formed at the bottom of the cutting case to store chips generated during cutting by the cutting mechanism .
The valve accommodating case is integrally formed with a pair of sleeve portions that embrace the outer circumference of the existing pipe.
Each of the sleeve portions has an annular inner end surface protruding inward with respect to the inner wall of the valve accommodating case accommodating the sluice valve.
The sluice valve has a pair of annular flange portions that separately contact the inner end surfaces of the pair of sleeve portions.
A valve installation device in which an annular sealing material is arranged between the inner end surface and the flange surface of the annular flange portion. The relative distance opposite in the direction along the line of the existing pipe of the inner wall surface of the storage space is longer than the ablation length being cut by the cutting of the cutting mechanism of the existing pipe, the ablation length, a pair valve installation system of claim 1, which is longer than the opposing length of the front Symbol inner end face of. The valve accommodating case has a first valve case arranged below the existing pipe and a second valve case connected to the first valve case and arranged above the existing pipe. ,
The valve installation device according to claim 1 or 2 , wherein the sleeve portion has a cylindrical shape in which the first valve case and the second valve case are superposed. Each of the flange surfaces of the pair of annular flange portions is formed on an inclined surface whose width becomes narrower toward the lower side in the insertion direction when the sluice valve is installed by the valve installation mechanism.
The valve installation device according to any one of claims 1 to 3, wherein the inner end surface of the sleeve portion facing the flange surface is set to an inclined posture along the flange surface. A valve accommodating case that forms a sealed space that seals the space including the excision area on the outside of the existing pipe having the excision area removed by cutting.
A sluice valve inserted into the excision region so as to allow opening and closing of the flow path of the existing pipe.
The said valve housing case, a pair of sleeve portion which embrace the outer periphery of the existing pipe is integrally formed,
Each of the sleeve portions has an annular inner end surface protruding inward with respect to the inner wall of the valve accommodating case accommodating the sluice valve.
Said gate valve is an annular flange portion contacting each other in said end surfaces of the pair of the sleeve portion,
A sluice valve unit in which an annular sealing material is arranged between the inner end surface and the flange surface of the annular flange portion. The annular flange portion is formed on an inclined surface whose width becomes narrower toward the lower side in the insertion direction of the sluice valve.
The sluice valve unit according to claim 5, wherein the inner end surface of the sleeve portion facing the flange surface of the annular flange portion is set to an inclined posture along the flange surface. The sluice valve unit according to claim 5 or 6, further comprising a fixture that comes into contact with the sluice valve by being inserted from the outside of the valve accommodating case to fix the sluice valve to the valve accommodating case. Any of claims 5 to 7, wherein an outer peripheral seal extending over the inner circumference of the outer end portion of the sleeve portion and the outer circumference of the existing pipe is provided, and a push ring for crimping the outer peripheral seal to the outer circumference of the existing pipe is provided. The sluice valve unit described in item 1.

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