JP5747068B2 - Valve body removal device and valve body removal method - Google Patents

Description

  The present invention relates to a valve body removing device and a valve body removing method for removing a valve body of a valve device connected to an existing fluid pipe.

  Conventionally, an existing fluid pipe such as a water main pipe has been provided with a valve device such as a gate valve so that the fluid conduit of the existing fluid pipe can be blocked. For example, because of the structure of the gate valve, the valve main body composed of a valve body for shutting off the fluid pipe line, an operation shaft for operating the valve body, and the like greatly protrudes from the fluid pipe line. When the ability to shut off the fluid line is reduced due to the end of the service life, or when the gate valve is no longer necessary for the fluid line, the work valve is sealed in a sealed manner in the work case, and the partition is separated from the fluid line. To remove the entire valve and place the fluid pipe, or to use the gate valve only as a fluid pipe line, or to remove only the valve body part leaving the pipe part for reuse as a gate valve in the future Removal work is being carried out.

  As a method for removing the valve body by surrounding the entire gate valve with the work case and leaving the pipe section, for example, a work case having a structure divided into an upper part and a lower part across the fluid pipe line may be used. The work case is attached to the outer periphery of the fluid pipe line near the gate valve in a watertight manner so that the fluid pipe line near the valve and the gate valve is sandwiched from above and below. After removing the valve body part from the pipe part in the work case, the work valve provided in the work case closes the space on the pipe part side in the work case in a sealing manner. There is one in which the main body is taken out of the working case and the valve body in the valve main body is replaced with a new one (for example, see Patent Documents 1 and 2).

  In addition, as another method, for example, as a method of removing the valve body of the gate valve in an uninterrupted state, a flange portion on the pipe section side in which the valve main body portion is detachably joined in advance in the gate valve device Is manufactured in a large size so as to protrude more radially outward than the flange portion on the valve main body side to be joined to the flange portion, and the gate valve device is used in a fluid pipe network, etc. If the ability to shut off the pipeline is reduced, etc., install a continuous water valve detachment device with a cap-type work case on the flange on the pipeline side in a sealed manner. In some cases, the valve body can be removed (see, for example, Patent Document 3).

JP 2012-207719 (6th page, FIG. 6) JP 2007-177945 A (page 6, FIG. 9) JP-A-10-26237 (page 3, FIG. 6)

  However, in Patent Documents 1 and 2, the gate valve is made watertight together with the fluid pipe line in the vicinity of the gate valve from above and below by the working case formed by dividing the fluid pipe into the upper part and the lower part. It is necessary to cover. In order to cover a fluid pipe line with a work case from below in a water main having a large gate valve, it is necessary to excavate the buried ground so as to be largely separated from the water main to ensure a sufficient working space. There is a problem that excavation work and backfilling work take a lot of time and work efficiency is lowered.

  Further, in Patent Document 3, since the pipe part is not surrounded by the working case together with the fluid pipe line, it is not necessary to excavate and secure a large working space, but the pipe line is previously prepared when the gate valve device is manufactured. It is necessary to form a special large flange portion on the outer peripheral portion of the portion, and there is a problem that it cannot be used for an existing general valve device and is not practically used.

  The present invention has been made paying attention to such problems, and can be applied to various valve devices, and does not need to surround the entire valve device, so that the operation on the valve main body side rather than the fluid conduit is performed. It aims at providing the valve body removal apparatus and the valve body removal method which can enclose a pipe line part main body and a valve main-body part by a working case in a sealing form only.

In order to solve the above-mentioned problem, the valve body removal device of the present invention includes:
In the valve body removing device for removing the valve body part of the valve device comprising a pipe body connected to the fluid pipe and a valve body capable of closing the pipe body,
The valve body removal device is capable of moving a working case that encloses a part of the valve device in a sealed state, a working valve that partitions an internal space of the working case, and the valve main body in the working case. A valve moving means, and a fastening member that fastens a first flange provided on the conduit body and a second flange provided on the valve body,
The working case has a sealing portion that seals a radially outer side of the insertion hole of the first flange through which the fastening member is inserted.
According to this feature, the working case seals the outer side in the radial direction of the fastening member insertion hole of the first flange and surrounds a part of the valve device in a sealed manner with the working case. In addition to being applicable, the valve main body can be removed from the valve device only by the work on the valve main body side of the fluid pipe.

The valve body removal device of the present invention is
The sealing portion seals an outer peripheral surface of the first flange.
According to this feature, the working case seals the outer peripheral surface of the first flange and encloses part of the valve device in a sealed manner with the working case, so that it can be applied to various valve devices, It is not necessary to enclose the entire valve device, and the valve main body can be removed from the valve device.

The valve body removal device of the present invention is
The fastening member includes a long nut that protrudes at least from the second flange toward the work valve.
According to this feature, the fastening member is a long nut that protrudes at least from the second flange in the direction of the work valve. Therefore, the nut can be easily accessed even if the space for the work case is small. The operation is facilitated, and the valve element can be removed from the valve device only by the operation on the valve main body side of the fluid conduit.

The valve body removal device of the present invention is
The work case is operable from the outside of the work case, and further includes holding means for holding the second flange on the first flange side.
According to this feature, since the holding means that can be operated from the outside of the working case is provided, the entire valve device can be applied to various valve devices without enclosing the work case in a sealed manner. It is not necessary to enclose the entire valve device, and the valve main body portion can be removed from the valve device only by work on the valve main body side of the fluid pipe.

The valve body removal device of the present invention is
The working case includes a first divided body including the sealing portion and a second divided body surrounding a part of the valve device, and the first divided body has a gap between the second flange and the second flange. It has the cylinder part which has.
According to this feature, since the cylinder portion has a gap with the second flange, the valve body portion can be reliably removed without interference when the valve body portion is removed.

The valve body removal device of the present invention is
The first divided body is divided into two along at least the minor axis direction of the first flange.
According to this feature, the first divided body is divided into two along at least the minor axis direction of the first flange. Therefore, when the first divided body is assembled along the major axis direction of the first flange, Using the outer peripheral surface of the flange as a guide, the clearance between the first divided body and the first flange is gradually narrowed, and the first divided body is closely sealed to the outer peripheral portion of the first flange without tilting. And can be securely attached to the first flange of various valve devices.

In the valve body removal method for removing the valve body part of the valve device comprising a pipe body connected to the fluid pipe and a valve body capable of closing the pipe body,
A bolt for connecting the first flange provided in the pipe body and the second flange provided in the valve body, and a step of replacing the nut with a working bolt and nut;
Sealing a part of the outer peripheral surface of the first flange and enclosing a part of the valve device in a sealed state with a working case;
Removing the valve body from the conduit body in the working case;
The process valve provided in the working case closes the conduit portion main body side in a sealed state rather than the valve main body portion in the working case;
Removing the valve body,
It is characterized by having.
According to this feature, the work case seals a part of the outer peripheral surface of the first flange, and a part of the valve device is enclosed in a sealed state by the work case. Therefore, the work case can be applied to various valve devices. In addition, the valve body can be removed from the valve device only by the work on the valve body side of the fluid pipe.

(A) is a top view which shows the gate valve in an Example, (b) is a side view. It is a side view of the partial cross section which shows the valve body removal apparatus with which the gate valve was mounted | worn. (A) is a CC arrow view of FIG. 2, (b) is a JJ arrow view of FIG. 3 (a). (A) is detail drawing of a sealing part, (b) is a HH arrow line view of Fig.3 (a), (c) is a HH arrow line view of Fig.3 (a). FIG. 6 shows another embodiment of the figure. (A) is hanging ear cutting, (b) is a diagram showing a procedure for exchanging with work bolts and work nuts. (A) is the attachment procedure of a division | segmentation type attachment member, (b) is removal of a cap, (c) is a side view of the partial cross section which shows the state after attachment of a division | segmentation type attachment member. (A) is a top view which shows the state which attached the valve suspension movement tool, (b) is a side view of a partial cross section, (c) is a HH arrow directional view of (a). It is a side view of the partial cross section which shows the valve body removal apparatus with which the gate valve was mounted | worn. It is a side view of the partial cross section which shows the state which pulled up the valve main-body part. (A) is a plan view of an embodiment of a split-type mounting member suitable for another type of gate valve, (b) is a partial cross-sectional view seen from the tube axis direction, and (c) is a partial cross-sectional view. It is a side view. (A) is a plan view of an embodiment of a split-type mounting member adapted to yet another type of gate valve, (b) is a partial cross-sectional view as seen from the tube axis direction, and (c) is a partial cross-section. FIG. (A) is a plan view of the embodiment when the holding means is not used, (b) is a side view of a partial cross section seen from the direction perpendicular to the tube axis, and (c) is a view seen from the tube axis direction. is there. It is a side view of the partial cross section which shows the procedure of the valve body removal method when not using a holding means. (A) is a plan view of an embodiment when a working nut is not used, (b) is a side view of a partial cross-section, (c) is a plan view showing a support member that supports the working bolt, d) is a side view of a partial cross section showing a state in which a support member for supporting a work bolt is attached. It is a side view of the partial cross section which shows another embodiment of the split-type attachment member which does not use a work nut. (A) is a top view which shows embodiment at the time of integrating the 1st division body, (b) is a side view of a partial cross section.

  EMBODIMENT OF THE INVENTION The form for implementing the valve body removal apparatus and valve body removal method which concern on this invention is demonstrated below based on an Example.

  A valve body removal apparatus according to an embodiment will be described with reference to FIGS. 1 to 11. As shown in FIG. 1, in this embodiment, a gate valve 2 capable of blocking a fluid pipe line is connected to existing fluid pipes 1, 1 ′. The casings of the fluid pipes 1, 1 ′ and the gate valve 2 are made of, for example, ductile cast iron for waterworks buried in the ground, and the fluid pipes 1, 1 ′ are formed in a substantially circular shape in cross section. The peripheral surface is covered with a mortar layer. The fluid pipe and valve device according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. In this embodiment, the fluid in the fluid pipe is clean water, but is not limited to clean water in this embodiment. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas-liquid mixture of gas and liquid It does not matter.

  As shown in FIGS. 1 and 2, the gate valve 2 which is a valve device in the present embodiment is composed of a pipe portion main body 3 and a valve main body portion 11. The pipe section body 3 includes a pipe section 4 communicating with the fluid pipes 1 and 1 ′, flange sections 7 and 7 ′ formed integrally with the pipe section 4, and B different from the pipe axis AA of the pipe section 4. It is comprised from the cylindrical neck part 5 protruded to -B direction, and the pipe line part flange 6 as a 1st flange of this invention.

  The valve body 11 includes a valve body 12 (see FIG. 9) capable of closing the pipe body 3, a valve lid flange 13 as a second flange of the present invention, and a valve formed integrally with the valve lid flange 13. A lid 14, a rod-like valve stem portion 16 that projects from the upper surface of the valve lid 14 and opens and closes the gate valve 2 from the outside, and a seal provided on the valve lid 14 for sealing the outer peripheral surface of the valve stem portion 16 A valve box 15 having a packing (not shown) inside, and the valve box 15 is detachable by a valve box upper screw 17 via a packing (not shown) for sealing between the valve lid 14 and the valve box 14. It is joined. Further, the pipe body 3 and the valve body 11 are bolts and nuts 22 via a packing (not shown) for sealing the pipe flange 6 and the valve lid flange 13 of the pipe body 3. It is joined so that attachment or detachment is possible.

  Also, flange portions 7 and 7 'projecting in the outer diameter direction are formed at both ends of the tube portion 4 of the conduit portion main body 3, and the flange portions 7 and 7' are fluid pipes 1 and 1 '. Are joined to the flanges 8 and 8 'at the ends of the flanges in a sealed manner through packing (not shown), and the flanges 7, 7', 8, and 8 'are fastened with bolts and nuts (not shown). Has been.

  Next, as shown in FIGS. 1 and 2, the valve body removal device 30 of the present embodiment is provided in a working case 30 that encloses part of the gate valve 2 in a sealing manner, and in the working case 30. The working valve 26 capable of partitioning the internal space of the working case 30 into a space D and a space E by operation from the outside of the working case 30 and the valve main body 11 are moved in the working case 30. It is comprised from the valve suspension movement tool 91 as a valve movement means of this invention which enables this.

  As shown in FIG. 2, the work case 30 includes a split mounting member 31 as a first split body of the present invention, a cylindrical member 61 and an upper cover 71 as a second split body of the present invention. In the present embodiment, the second divided body is a cylindrical member. However, the second divided body may be a cylindrical member having a cross-sectional shape that is approximately oval, approximately oval, or approximately square. The split attachment member 31 surrounds a part of the pipe line flange 6 and the valve body 11. The cylindrical member 61 is connected to the split mounting member 31 and surrounds the work valve 26 and the valve body 11. The upper cover 71 is connected to the cylindrical member 61 to close the opening of the cylindrical member 61 and to suspend the valve. A moving tool 91 is placed.

  As shown in FIG. 2 to FIG. 4A, the split type mounting member 31 has a sealing portion 36 on the inner peripheral surface of the split type mounting member 31 at a position facing the outer peripheral surface of the pipe line flange 6. The annular groove portion 37 is formed, and a sealing member 38 that is fitted and held in the groove portion 37. The thickness dimension of the sealing member 38 is larger than the depth of the groove portion 37 so that the sealing member 38 is appropriately compressed. As the sealing member according to the present invention, a round rubber packing having a circular cross section, a substantially C-shaped or rectangular shape, or a rubber packing with a lip can be used. Thereby, the sealing part 36 can enclose a pipe line part sealingly only by the operation | work by the side of a valve main-body part rather than a fluid pipe line by the sealing member 38 which contact | connects the outer peripheral surface of the pipe line flange 6. FIG. In FIG. 2 to FIG. 4A, the sealing member 38 of the sealing portion 36 is sealed in contact with only the outer peripheral surface of the pipe portion flange 6, but the pipe portion flange 6 of the pipe portion main body 3. Of the bolt insertion hole 24 in the radial direction, that is, only the lower end surface in the axial direction of the pipe section flange 6, or both the lower end face in the axial direction of the pipe section flange 6 and the outer peripheral surface of the pipe section flange 6, It can also be sealed with a sealing member. Note that the sealing member may be extended to the second flange in order to improve the water-stopping property.

  As described above, at least the outer peripheral surface of the pipe section flange 6 includes the first divided body (divided attachment member 31) having the sealing portion, and the second divided body (cylindrical member 61 and the upper part) surrounding a part of the valve main body. Since the first divided body is securely attached to the outer peripheral surface of the pipe section flange 6 and the second divided body can be attached after the first divided body is divided into the cover 71), The fluid pipe portion and the valve main body portion can be easily covered, and the workability can be improved.

  As shown in FIG. 4A, the split mounting member 31 is continuously provided so as to increase in diameter from the upper part of the annular groove portion 37 of the sealing portion 36, and the outer peripheral surface of the valve lid flange 13. Is formed in a slightly larger diameter than the valve lid flange 13 and is formed in a substantially oval cylindrical shape in plan view. Further, the diameter of the cylinder 40 is increased from the upper end of the cylinder 40. Thus, the large-diameter collar portion 41 formed in a large-diameter substantially circular collar shape in a plan view is continuously provided.

  Thus, since the cylinder part 40 has a gap from the upper part of the annular groove part 37 and has a gap with the valve lid flange 13, it does not interfere when the valve body part 11 is removed, and the valve body part reliably. 11 can be removed, and in the case of the present embodiment, the attachment state of the sealing member 38 can be confirmed after the split attachment member 31 is attached to the duct portion flange 6, so that the sealing portion 36 can be securely attached. Can be installed. In addition, in order to prevent damage to the cylinder part 40 and the valve main-body part 11 without preventing removal of the valve main-body part 11, you may interpose an elastic body, resin, etc. in the said clearance gap.

  Further, as shown in FIG. 3, the split attachment member 31 is divided into two substantially equally in the circumferential direction of the pipe line flange 6 and substantially coincides with the pipe axis AA direction of the pipe part 4. Yes. Further, packing 42 is interposed on the dividing surface of each divided piece and is joined in a sealed manner by bolts and nuts.

  In the present embodiment, by dividing in this way, the split mounting member 31 is guided to the outer periphery of the first flange without tilting the split mounting member 31 with the side surface of the oval pipe section flange 6 as a guide. It can be tightly sealed and reliably sealed. Further, when the difference between the short diameter dimension and the long diameter dimension of the pipe line flange 6 is small, it becomes difficult to distinguish the long axis direction and the short axis direction of the pipe line flange 6 and the assembly direction may be mistakenly assembled. . On the other hand, since the split-type mounting member 31 is divided into two along the short axis direction of the pipe line flange 6, it can be assembled with respect to the pipe line flange 6 from the long diameter direction side, so that an assembly error occurs. Can be prevented. Further, when the split mounting member 31 is assembled along the long axis direction of the pipe section flange 6, the clearance between the split mounting member 31 and the pipe section flange 6 while using the outer peripheral surface of the pipe section flange 6 as a guide. Is gradually narrowed, so that the split-type mounting member 31 can be securely sealed by being brought into close contact with the outer peripheral portion of the pipe line flange 6 without tilting, and can be reliably attached to the pipe line flange 6 of various valve devices. Can be installed on.

  By attaching the split-type mounting member 31 to the pipe line flange 6, the pipe body 3 and the valve body 11 are sealed with the work case 30 only by work on the valve body 11 side of the fluid pipe. Since it can be enclosed, it is not necessary to dig deeper than the pipe body 3 even when the fluid pipe 1 or the gate valve 2 is buried in the ground, and excavation and backfilling work is facilitated, and workability is improved. Can be improved.

  The split structure of the split mounting member 31 is not limited to the present embodiment, and may be configured to be split into a plurality of split bodies of three or more splits in the circumferential direction of the pipe line flange 6, The pipe part flange 6 may be divided into two parts in the circumferential direction and may be divided into a plurality of parts in the pipe axis direction of the neck part 5. Furthermore, it can also be set as the 1st division body of integral structure, without dividing | segmenting, and it can adapt to a various valve apparatus and can attach a working case to a pipe line part.

  As shown in FIG. 4, at the lower end of the sealing portion 36 of the split mounting member 31, the head of the working bolt 23 that fastens the pipe portion flange 6 and the valve lid flange 13 is held, and the bolt cannot be removed. It has the supporting member 43 which hold | maintains like this. Further, a concave groove is formed in the circumferential direction on the outer peripheral surface of the working bolt 23 as the fastening member of the present invention, and a substantially annular packing is fitted in this groove. With these packings, the gap between the work bolt 23 and the insertion hole 24 is sealed, and the fluid in the work case 30 is prevented from leaking.

  Further, as shown in the cross-section HH of FIG. 3A and FIG. 4B, the pipe body 3 is located at a position corresponding to the upper surface of the valve lid flange 13 on the side circumferential surface of the tubular portion 40. The holding means 55 of the present invention is provided at a substantially intermediate position of the working bolt 23 connecting the valve body 11 and the valve body 11. The holding means 55 includes a communication hole 51 having a thread groove that communicates from the outer peripheral side of the cylindrical portion 40 to the inner peripheral side, and a fixing bolt 52 that is inserted into the communication hole 51. The thread of the fixing bolt 52 is provided at a portion between an inclined portion 53 described later and a packing fitted on the outer peripheral surface of the fixing bolt 52.

  As shown in FIG. 4, the fixing bolt 52 has an inclined portion 53 that is formed on the distal end portion that protrudes toward the inner peripheral side of the cylindrical portion 40 so that the distal end side gradually becomes smaller in diameter and can come into contact with the valve lid flange 13. Thus, by rotating the fixing bolt 52 from the outside of the working case 30, the inclined portion 53 can be advanced by the screw action and brought into contact with the upper surface of the valve lid flange 13. Further, the inclined portion 53 can be moved backward by the screw action so as to be separated from the valve lid flange 13.

  The inclined portion 53 of the fixing bolt 52 is brought into contact with the upper surface of the valve lid flange 13, and the valve main body portion 11 is held and fixed to the pipe portion main body 3 side by the inclined portion 53. Thereby, after attaching the split-type mounting member 31 of the working case 30 to the pipe line flange 6, the valve body 11 is fixed to the pipe body 3 by the fixing bolt 52, and the work bolt 23, the work Even after the nut 25 can be unfastened and the valve body 11 is hermetically enclosed by the work case 30, the fixing bolt 52 is rotated from the outside of the work case 30 to rotate the valve. The fixing of the main body 11 and the pipe main body 3 can be released.

  Further, a concave groove is formed in the circumferential direction on the outer peripheral surface of the fixing bolt 52, and a substantially annular O-ring 54 is fitted in this groove. These packings 54 seal the gap between the fixing bolt 52 and the communication hole 51 of the cylindrical portion 40, and prevent the fluid in the work case 30 from leaking.

  Further, when the contact surface pressure between the fixing bolt 52 and the valve lid flange 13 is large, as shown in FIG. Can be provided to increase the contact area. Further, the number and installation positions of the fixing bolts 52 and the communication holes 51 are not limited to the present embodiment, but may depend on the strength of the fixing bolts 52 themselves, the weight of the working case 30, the circumferential length of the pipe body 3, and the like. Accordingly, more or less than the present embodiment may be formed. As a result, the valve body 11 can be held on the side of the pipe body 3 by the fixing bolt 52.

  As shown in FIG. 2, an insertion hole 75 that communicates from the upper surface side to the lower surface side is formed in the central portion of the closing portion 74 of the upper cover 71. A spindle 92 for pulling up and removing the valve main body 11 from the conduit main body 3 can be inserted into the insertion hole 75. The work case 30 is hermetically sealed by a sealing material 76 interposed between the upper cover 71 and the spindle 92.

  Further, as shown in FIG. 2, the valve suspension moving tool 91 is fixed by a lever hoist 95 so as to keep a predetermined distance between the support plate 94 fixed to the upper end of the spindle 92 and the closing portion 74 of the upper cover 71. Has been. When the valve lid flange 13 is removed from the pipe section main body 3, the work case is filled with fluid, the spindle is pushed upward by water pressure, and the support plate 94 is fixed at a predetermined position by the lever hoist 95. From this state, the spindle hoist 92 can be gradually moved by operating the lever hoist 95 to be loosened. Note that a lifting device such as a crane may be used when the lifting with water pressure is insufficient. Further, the length of the spindle 92 is such that, as will be described later, when the tip of the spindle 92 reaches the vicinity of the upper end of the valve stem portion 17 of the gate valve 2 when it is most advanced into the working case 30, the spindle 92. Thus, the lower end of the valve main body 11 is adjusted so as to reach the upper part of the work valve 26 when the valve main body 11 is most retracted to be separated from the conduit main body 3.

  Next, the valve body removal method of a present Example is demonstrated with reference to FIGS. 5 to 11, the valve body 6 is substantially fully opened, and the fluid is flowing through the fluid pipes 1 and 1 ′ via the gate valve 2.

  As shown in FIG. 5, when the hanging ear 8 of the gate valve 2 protrudes from the outer periphery of the pipe line flange 6 and the valve lid flange 13, it is cut and removed. Then, the existing bolt / nut 22 connecting the pipe line flange 6 and the valve lid flange 13 is replaced with a work bolt 23 and a long work nut 25 as a fastening member of the present invention. In the replacement work for replacing the predetermined working bolt 23 and the working nut 25, the existing bolts and nuts 23 are replaced one by one or a predetermined number without leaking the fluid in the fluid pipe 1. The working bolt 23 and the working nut 25 can be exchanged. The replacement operation may be performed while fixing with a vise.

  Thus, by replacing with the long work nut 25, as shown in FIG. 6, since the work nut 25 protrudes from the large-diameter flange 41 of the split mounting member 31, the work space is small. Since the nut can be easily accessed, the disassembling and assembling work becomes easy. If the work nut 25 can be removed in the work space, the work nut 25 does not have to be protruded from the large-diameter flange 41 of the split mounting member 31.

  Next, as shown in FIG. 6, between the divided pieces of the split-type mounting member 31, a packing 42 integrated with the split-type mounting member 31 separately or by adhesion / vulcanization is interposed. Is attached to the pipe flange 6 in a direction substantially orthogonal to the pipe axis AA of the fluid pipe 1 and joined in a temporarily fixed state with bolts and nuts 32 to integrate the split attachment member 31. Here, the height is adjusted by the support 96 so that the surface of the large-diameter collar portion 41 of the split-type mounting member 31 is adjusted to be substantially horizontal, and the split-type mounting member 31 is reliably supported.

  Next, as shown in FIGS. 6 and 7, the fixing bolt 52 of the split mounting member 31 is rotated to lightly contact the inclined portion 53 with the valve lid flange 13 formed integrally with the valve lid 14 ( FIG. 7 (c)). In this state, the bolt / nut 32 is tightened with a specified torque, and the split mounting member 31 is integrated. Further, from this state, the fixing bolt 52 of the split mounting member 31 is tightened with a prescribed torque, and the inclined portion 53 is brought into strong contact with the valve lid flange 13 formed integrally with the valve lid 14. As a result, the valve main body 11 is firmly held on the side of the pipe section main body 3 by the fixing bolt 52, so that the work bolt 23 and the work nut 25 for connecting the pipe section flange 6 and the valve lid flange 13 are removed. Even if it removes, it can prevent that the valve main-body part 11 remove | deviates from the pipe-line part main body 3. FIG. Alternatively, the height may be adjusted and supported by the support 96 after the fixing bolt 52 is brought into light contact and the level is adjusted.

  Further, as shown in FIG. 6 (b), the upper end portion of the valve stem portion 16 of the gate valve 2 is covered with an operation handle (not shown) for rotating the valve stem portion 16. The cap 18 having the prescribed shape is removed. The height of the gate valve can be kept low by removing the cap 18. If there is room in the work space, the work can be performed with the cap 18 attached.

  Next, as shown in FIG. 7, the work nut 25 is removed from the work bolt 23 that connects the conduit body 3 and the valve lid 14. At this time, the rotation of the work bolt 23 is stopped using a rod-shaped rotation stop jig 44 shown in FIG. Since the work case 30 is divided into the split-type mounting member 31 (first divided body) and the second divided body 80, the whole gate valve 2 is opened without being surrounded by the work case 30. The existing bolts / nuts 22, the work bolts 23, and the work nuts 25 that connect the valve main body 11 and the pipe line main body 3 can be removed, so that workability can be improved.

  Further, as shown in FIG. 7B, a valve suspension fitting 93 attached to one end of the spindle 92 is put on the upper end portion of the valve stem portion 16 of the gate valve 2, and the valve lid upper screw 17 is used. The valve suspension fitting 93 and the valve lid 14 are fixed, and the valve main body 11 and the spindle 92 are connected.

  Next, as shown in FIG. 8, the cylindrical member 61 is placed on the upper part of the split mounting member 31, and the large-diameter flange 41 of the split mounting member 31 and the lower flange 62 of the cylindrical member 61 are connected with bolts and nuts 64. By fastening, the split-type attachment member 31 and the cylindrical member 61 are fixed. Further, the upper cover 71 having the spindle 92 passed through the insertion hole 75 is placed on the upper part of the cylindrical member 61, and the upper flange 63 of the cylindrical member 61 and the flange 72 of the upper cover 71 are fastened with bolts and nuts 73. The cylindrical member 61 and the upper cover 71 are fixed. Further, a support plate 94 is fixed to the tip of the spindle 92, a lever hoist 95 is attached, and a chain is stretched with an appropriate tension. The cylindrical member 61, the upper cover 71, and the valve suspension moving tool 91 may be assembled and integrated in advance, and the cylindrical member 61 and the like may be fixed together on the upper part of the split mounting member 31. Thereby, workability | operativity at a work site can be improved significantly.

  Then, a fluid such as water is introduced into the internal space of the work case 30 while discharging air from the internal space by the air valve 105, and it is confirmed that there is no fluid leakage from each connection portion of the work case 30. Then, the pressure in the working case 30 is adjusted to be approximately equal to the pressure in the pipes of the fluid pipes 1 and 1 ′. In addition, the leakage check after the fixing work of the second divided body 80 and the split mounting member 31 described above is omitted, and there is no fluid leakage from each connection portion only after the connection of the entire work case 30 is completed. You may make it confirm that.

  Next, as shown in FIG. 9 (b), the fixing bolt 52 is rotated by a predetermined amount from outside the work case 30, and the inclined portion 53 of the fixing bolt 52 is moved in the direction of separating from the valve lid flange 13. Thus, the sealed state between the pipe body 3 and the valve body 11 is relaxed, and the fluid in the pipe body 3 is guided into the working case 30 from the gap between the pipe body 3 and the valve body 11. . Thereby, the pressure in the pipe body 3 and the working case 30 are adjusted equally.

  Then, the fixing bolt 52 is further rotated to separate the inclined portion 53 from the valve lid flange 13. Thereafter, when the lever hoist 95 of the valve suspension moving tool 91 is operated to gradually loosen the chain, the spindle 92 is pushed up by water pressure to move, and the valve body 11 is moved to the upper space D above the work valve 26. Pull up. At this time, a packing for sealing the valve body 11 and the pipe body 3 may be left behind. For removing the packing, although not specifically shown, a window made of transparent acrylic or the like sealed in the cylindrical portion 40 of the split mounting member 31 is provided, and a rod-like member is sealed from the outside of the work case 30 to work. The packing may be removed so that it can be inserted into the case 30.

  Further, by moving the work valve 26 into the cylindrical member 61, the internal space of the work case 30 is divided into the upper space D and the lower space E, and the lower space B is closed in a sealed manner. As a result, the internal space of the working case 30 is divided into the upper space D and the lower space E, and the upper space D can be opened while keeping the lower space E sealed.

  Then, the fluid in the upper space D is discharged to the outside of the working case 30 through a discharge valve (not shown). Thereafter, the bolts and nuts 73 connecting the upper cover 71 and the cylindrical member 61 are removed, and the valve main body 11 is removed together with the upper cover 71 and the valve suspension moving tool 91.

  In addition, although the shape of the pipe-line part flange 6 of Example 1 was an oval shape, a specific structure is not restricted to these Examples. For example, the sealing portion 36 of the split-type mounting member 31 of the first embodiment has an oval shape in accordance with the shape of the pipe line flange 6, but as shown in FIG. In the case of the gate valve 101 having the lid flange 103, the shape of the sealing portion 109 of the split-type mounting member 107 can be configured in an oval shape in accordance with the shapes of the pipe line flange 102 and the valve lid flange 103. Furthermore, the present invention can be applied not only to the oval shape and the oval shape but also to the substantially rectangular flange shapes 115 and 116 such as the gate valve 111 of FIG.

  Further, when the length of the neck 104 is short as shown in FIG. 10, that is, when the dimension M of the lower surface position of the pipe flange 102 from the pipe axis AA is smaller than the radial dimension R of the flanges 108 and 108 ′, The split-type attachment member 107 can also be configured to be split into four split bodies in the circumferential direction of the pipe line flange 102. The number of divisions is not limited to an even number and may be an odd number. Furthermore, the width dimension N in the tube axis direction (AA direction) of the outer wall of the sealing portion 109 of the split mounting member 107 is smaller than the inter-face dimension L between the flange 108 and the flange 108 'facing the gate valve. By configuring, the split mounting member of the present invention can be applied even when the length M of the neck is short. As described above, the split mounting member can adapt the shapes of various valve devices, and the working case of the present invention can be mounted on various valve devices.

  The valve body removal apparatus and the valve body removal method according to the second embodiment will be described with reference to FIGS. 12 and 13. The valve body removal device and the valve body removal method according to the second embodiment are gate valves having the same shape as the gate valve 111 in FIG. 11, but are different in that the holding means 55 is not used. Hereinafter, the description which overlaps with the valve body removal apparatus and valve body removal method of Example 1 is abbreviate | omitted.

  As shown in FIG. 13, the working case 120 includes a split mounting member 121 as a first divided body of the present invention, a cylindrical member 126 as a second divided body of the present invention, a work valve cylindrical portion 127, and an upper cover. 128. The cylindrical member 126, the working valve cylindrical portion 127, and the upper cover 128 are integrally connected, and the connecting member 130 and the valve removal shaft 131 are incorporated in the cylindrical member 126, the working valve cylindrical portion 127, and the upper cover 128. ing. Further, an insertion machine 132 is attached on the upper cover.

  The procedure for removing the valve body will be described. First, in the gate valve 111 of FIG. 12, the packing 122 is interposed between the split pieces of the split mounting member 121 as the first split body of the present invention, and the split pieces are connected to the pipe axis AA of the fluid pipe 1. It covers from the outer diameter outer side of the pipe line flange 115 in a direction substantially orthogonal to the bolt and nut 125 and is fastened. Next, the existing bolts and nuts connecting the pipe line flange portion 115 and the valve lid flange 116 are replaced with work bolts 123 and work nuts 124 one by one or a predetermined number.

  Next, as shown in FIGS. 12 and 13, the cylindrical member 126, the work valve cylindrical portion 127, the upper cover 128, the coupling member 130 and the valve removal shaft 131 are assembled together on the split mounting member 121. Install and fix. Then, the valve rod portion 129 of the gate valve 111 and the connecting member 130 are connected from the window 134 of the cylindrical member 126, and the valve lid 136 of the gate valve 111 is pressed so as not to move via the connecting member 130. Further, the work nut 124 that fixes the valve lid 136 to the pipe line flange 115 is removed. Since the work nut 124 is formed in a long shape, the operator can easily access the work nut 124 from the window 130 and can be easily removed.

  Next, the window 134 is closed by the lid 135, the inserter 132 is operated, the valve removal shaft 131 is pulled up, and the valve body (not shown) can be removed from the gate valve 111.

  Next, after the work case 120 is separated into the upper space P and the lower space Q by the work valve 26, the fluid in the upper space P is discharged to the outside of the work case 30 through a discharge valve (not shown). . Thereafter, the bolts and nuts connecting the upper cover 128 and the work valve cylindrical portion 127 are removed, and the valve main body 111 is removed together with the upper cover 128 and the insertion machine 132.

  Thus, since the valve body removal apparatus and the valve body removal method of Example 2 do not use the holding means 55, the operation can be simplified.

  A valve body removal apparatus and a valve body removal method according to Example 3 will be described with reference to FIG. Although the valve body removal apparatus and the valve body removal method which concern on Example 1 and Example 2 used a long working nut, the valve body removal apparatus and valve body removal method which concern on Example 3 are This is different from the first and second embodiments in that no working nut is used. Hereinafter, the description which overlaps with the valve body removal apparatus and valve body removal method of Example 1 and Example 2 is abbreviate | omitted.

  In the gate valve 151 of FIG. 14, the divided piece of the split mounting member 152 is covered from the radially outer side of the pipe line flange 153, and the split mounting member 152 is assembled integrally with bolts and nuts (not shown). Next, the fixing bolt 159 of the holding means is rotated to bring the fixing bolt 159 into contact with the upper surface of the valve lid flange 154 so that the valve lid flange 154 is fixed so as not to move. In addition, since a support member that contacts and fixes the lower surface of the pipe line flange 153 is provided at the lower part of the split-type mounting member 152, it is firmly fixed.

  Next, the existing bolts and nuts 156 connecting the pipe line flange portion 153 and the valve lid flange 154 are replaced with work bolts 157 one by one or a predetermined number. Further, a substantially oval support member 158 divided into two is attached to the neck portion 160 of the conduit body, and the lower end of the working bolt 157 is supported.

  Next, as in FIGS. 8 and 9 of the first embodiment, the cylindrical member 61, the upper cover 71 and the valve suspension moving tool 91 are assembled on the split mounting member 152, and the valve body is processed in the same procedure as in the first embodiment. Can be removed. Also, in this case, the depth of excavation should be up to about half of the fluid pipe, with the bottom surface of the support member 158 placed between the excavation ground and leveled to ensure the weight of the work case, water, etc. I try to support it.

  Since the valve body removing device and the valve body removing method according to the third embodiment can remove the valve body without using the working nut, the procedure for attaching and removing the working nut installed in the working case can be omitted. Therefore, work time can be shortened.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in FIG. 14 of the third embodiment, an oval-shaped support member 158 divided into two is attached to the neck portion of the pipe section main body so as to support the lower end of the working bolt 157. However, the present invention is not limited to this, and a plurality of separate support members 164 may be fixed to the lower end of the first divided body 163 with screws or the like as shown in FIG. In this case, the support member 164 also has a work shaft 169 that seals the bolt insertion hole.

  Further, the split attachment member as the first split body of the first to third embodiments is divided in the circumferential direction of the pipe line flange 6. However, the present invention is not limited to this, and as shown in FIG. 16, the split mounting member 142 can be configured by a cylindrical portion 143 formed integrally and a push ring 144 divided into four in the circumferential direction. The sealing member 147 is fitted into the groove at the lower end of the cylindrical portion 143, and the cylindrical portion 143 is fitted to the outer periphery of the pipe line flange 145 from the axial direction of the valve shaft. Next, the pusher wheel 144 divided into four in the circumferential direction of the pipe line flange 145 is assembled to the cylindrical part 143 from the radial direction of the pipe line flange 145, the sealing member 147 is pressed, and the cylindrical part 143 and the pusher wheel 144 are connected to the bolt 149. It can also be set as the structure couple | bonded integrally by.

  In this embodiment, packing or the like is used as the sealing member. However, the present invention is not limited to this, and liquid packing may be used.

  In the present invention, the valve device is a gate valve, but may be a butterfly valve, a switching valve, a ball valve, a plug, or the like.

1, 1 'Fluid pipe 2 Gate valve (valve device)
3 Pipe section body 4 Pipe section 5 Neck section 6 Pipe section flange (first flange)
11 Valve body 13 Valve lid flange (second flange)
22 Existing bolts and nuts 23, 123 Work bolts (fastening members)
24 Bolt insertion hole (insertion hole)
25, 124 Work nut (fastening member)
30, 120 Working case 31 Split-type mounting member (first split body)
36, 109 Sealing portion 61 Cylindrical member (second divided body)
71 Upper cover (second divided body)
101, 111 Gate valve 102, 115 Pipe line flange (first flange)
103, 116 Valve lid flange (second flange)
107, 117 Split-type mounting member (first split body)
120 Working cases 121, 142 Split-type mounting member (first split body)
123 Working bolt (fastening member)
124 Working nut (fastening member)
141, 151, 161 Gate valve 145, 153, 166 Pipe line flange (first flange)
146, 154, 167 Valve lid flange (second flange)
152 Split-type mounting member (first split body)
163 1st division body

Claims (7)

In the valve body removing device for removing the valve body part of the valve device comprising a pipe body connected to the fluid pipe and a valve body capable of closing the pipe body,
The valve body removal device is capable of moving a working case that encloses a part of the valve device in a sealed state, a working valve that partitions an internal space of the working case, and the valve main body in the working case. A valve moving means, and a fastening member that fastens a first flange provided on the conduit body and a second flange provided on the valve body,
The working case includes a sealing portion that seals a radially outer side of an insertion hole of the first flange through which the fastening member is inserted.   The said sealing part seals the outer peripheral surface of a said 1st flange, The valve body removal apparatus of Claim 1 characterized by the above-mentioned.   The said fastening member is provided with the elongate nut which protrudes in the direction of the said work valve at least from the said 2nd flange, The valve body removal apparatus of Claim 1 or 2 characterized by the above-mentioned.   The said working case is provided with the holding means which can be operated from the exterior of this working case, and hold | maintains the said 2nd flange to the said 1st flange side. Valve body removal device.   The working case includes a first divided body including the sealing portion and a second divided body surrounding a part of the valve device, and the first divided body has a gap between the second flange and the second flange. The valve body removing device according to any one of claims 1 to 4, further comprising a cylindrical portion having the cylindrical portion.   The said 1st division body is divided into 2 along the at least short-axis direction of the said 1st flange, The valve body removal apparatus of Claim 5 characterized by the above-mentioned. In the valve body removal method for removing the valve body part of the valve device comprising a pipe body connected to the fluid pipe and a valve body capable of closing the pipe body,
A bolt for connecting the first flange provided in the pipe body and the second flange provided in the valve body, and a step of replacing the nut with a working bolt and nut;
Sealing a part of the outer peripheral surface of the first flange and enclosing a part of the valve device in a sealed state with a working case;
Removing the valve body from the conduit body in the working case;
The process valve provided in the working case closes the conduit portion main body side in a sealed state rather than the valve main body portion in the working case;
Removing the valve body,
A valve body removal method comprising:

Images