JP2023113325A - Branch flow path closing device and method for removing branch flow path closing device - Google Patents

Abstract

To provide a branch flow path closing device capable of being used even in a place where there is an obstacle at an upper part of a work space, and a method for removing a branch flow path closing device.SOLUTION: A branch flow path closing device X for closing a flow path of a branch pipe part branched from a fluid pipe, comprises a partition valve, a work case 30, a locking mechanism 4, a seal mechanism 5, and a shaft member 7. The work case 30 is a divided body obtained by dividing the shaft member 7 along an axial core Y direction, and divided parts of the divided body sandwich the shaft member 7 in a sealed state.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a branch channel blocking device for blocking a channel of a branch pipe branched from a fluid pipe, and a method for removing the branch channel blocking device.

Conventionally, existing fluid equipment consisting of on-off valves (repair valves, etc.) installed in branch pipes of fluid pipes (water pipes, etc.), air valves installed above the on-off valves, fire hydrants, etc. There is known a branch flow channel blocking device that is used when a fluid device is replaced with a new fluid device (a fluid device is updated) due to reasons such as aging (see, for example, Patent Literature 1).

The branch flow path closing device described in Patent Document 1 includes an outer operating shaft, an inner operating shaft inserted into the outer operating shaft, and a connection between the branch tube portion and the fluid tube by operating the outer operating shaft and the inner operating shaft. and a sealing member that is elastically deformed in the radially expanding direction by moving the outer operating shaft relative to the inner operating shaft to close the passage of the branch pipe. I have. The outer operating shaft and the inner operating shaft are divided so as to be connectable, and work efficiency can be improved even in a small working space.

JP 2010-38227 A

The branch flow path closing device described in Patent Document 1 has the outer operating shaft and the inner operating shaft divided so that they can be added and connected, so that it can be used even in a small working space. There was room for improvement in removing the device after occluding the flow path. In other words, there is an obstacle such as a ceiling wall in the upper part of the work space, and even if the operation shaft above the work case is removed, there may be no space between the upper end of the operation shaft and the ceiling wall to remove the work case.

Therefore, there is a demand for a branching flow path blocking device that can be used even in a place where there is an obstacle above the working space, and a method for removing the branching flow path blocking device.

A characteristic configuration of the branch channel blocking device according to the present invention is a branch channel blocking device that blocks a channel of a branch pipe branched from a fluid pipe, and is a gate valve that is detachably connected to the branch pipe. a work case detachably connected to the sluice valve; a locking mechanism locked to the connecting portion between the branch pipe portion and the fluid pipe; a shaft member having a seal mechanism having a member, a first shaft member supporting the locking mechanism and the seal mechanism, and a second shaft member connected to the first shaft member; (1) is a divided body divided along the axial direction of the shaft member, and the divided parts of the divided body sandwich the shaft member in a sealed state.

In this configuration, the locking mechanism that is locked to the connecting portion between the branch pipe portion and the fluid pipe prevents the shaft member from moving upward due to the fluid pressure, thereby blocking the flow path of the branch pipe portion. prevents the shaft member from moving downward. As a result, by attaching the branch channel closing device to the branch pipe portion, the fluid device can be replaced while preventing the outflow of the fluid from the branch pipe portion.

Further, the work case is a divided body divided along the axial direction of the shaft member, and the divided parts of the divided body sandwich the shaft member in a sealed state. Therefore, the work case can be removed to the side of the shaft member. That is, there is no need to remove the work case along the axial direction from the upper end of the shaft member, and the work case can be removed without interfering with the obstacle even in a place where there is an obstacle in the upper part of the work space. Further, since the shaft member is divided into the first shaft member and the second shaft member, the gate valve can be removed without interfering with the obstacle by removing the second shaft member. In this way, the branch flow path blocking device can be used even where there is an obstacle above the working space.

According to another characteristic configuration, the work case includes a first split case and a second split case, and the first split case includes a first half member and a circumferential portion of the first half member. a pair of first projections projecting radially outward from both ends in the direction, and a first connection flange connected to the flange of the gate valve, and the second split case is divided into halves. a second half member having a shape, a pair of second projecting portions projecting radially outward from both ends of the second half member in the circumferential direction, and a second connecting flange portion connected to the flange. A sealing member is arranged continuously on the mating surfaces of the first projecting portion and the second projecting portion and on the facing surfaces of the first connecting flange portion and the second connecting flange portion facing the flange. in that it is

In this configuration, since the sealing member is continuously arranged on the mating surfaces of the first projecting portion and the second projecting portion, and on the facing surfaces of the gate valve flanges in the first connecting flange portion and the second connecting flange portion, It is possible to reliably exhibit a sealing function on the split surface and the flange surface of the divided body.

Another characteristic configuration is that the work case includes a connecting flange portion connected to the flange of the gate valve, a tubular main body extending in the axial direction from the inner peripheral side of the connecting flange portion, and the tubular a bottom wall portion extending inwardly from an end portion of the main body opposite to the connecting flange portion, wherein the shaft member is sealingly sandwiched between the divided portions of the bottom wall portion; It is in.

As in this configuration, if the shaft member is sandwiched between the divided portions of the bottom wall portion in a sealed state, the work case can be made compact.

Another characteristic configuration is that the work case includes a connecting flange portion connected to the flange of the gate valve, a tubular main body extending in the axial direction from the inner peripheral side of the connecting flange portion, and the tubular An annular projecting portion annularly projecting outward from an end portion of the main body opposite to the connecting flange portion, and a divided plate-like member connected to the annular projecting portion, wherein the shaft member comprises: It is characterized in that it is sandwiched between the divided portions of the divided plate-shaped member in a sealed state.

As in this configuration, if a separate plate-shaped member connected to the annular projecting portion is separately provided, after the work case and the gate valve are removed, the divided plate-shaped member covers the opening of the branch pipe portion. can be sandwiched, and the sealing function of the sealing mechanism can be stabilized.

A feature of the method for closing a branched flow path using any one of the devices for closing a branched flow path according to the present invention is that the flow of the branched pipe portion is controlled by the sealing mechanism in a state where the locking mechanism is locked to the connecting portion. a closing step of closing the path; after the closing step, a case removing step of removing the work case connected to the gate valve in a direction intersecting with the axial direction; and a gate valve removal step of removing the shaft member and then removing the gate valve along the axial direction.

In the closing step of this method, by locking the locking mechanism to the connecting portion between the branch pipe portion and the fluid pipe, upward movement of the shaft member due to the fluid pressure is prevented, and the fluid is supplied to the sealing mechanism. The downward movement of the shaft member is prevented by blocking the flow path of the branch pipe portion. As a result, the work case and gate valve can be removed after the closing process is performed.

In addition, in the case removal step of this method, the work case is removed in the direction intersecting with the axial direction, so even if there is an obstacle in the upper part of the work space, the work case can be removed without interfering with the obstacle. Furthermore, in the gate valve removal step of this method, after the case removal step, the second shaft member is removed and then the gate valve is removed along the axial direction. can be pulled out. In this way, the method for removing the branch flow path blocking device can be used even in a place where there is an obstacle above the working space.

FIG. 3 is a side view showing an existing fluid device; It is a sectional side view which shows the branch flow-path closure apparatus which concerns on this embodiment. 4 is an exploded perspective view of the work case; FIG. It is a figure which shows a division|segmentation plate-shaped member. It is a front view of a branch flow-path closure device. It is a side view of a branch flow-path closure device. It is a sectional view of a seal mechanism. It is a sectional side view which shows the operation|movement procedure of a branch flow-path closure apparatus. It is a side view which shows a temporary closure process and a removal process. It is a sectional side view which shows a mounting|wearing process. FIG. 10 is a side cross-sectional view showing a locking step and a closing step; It is a sectional side view which shows a 1st removal process. It is a sectional side view which shows a 1st installation process. It is a partial sectional side view which shows a 2nd removal process. It is a side view which shows a 2nd installation process. FIG. 4 is a side cross-sectional view showing a state in which the divided plate-shaped member is attached to the branch pipe portion; FIG. 10 is a diagram showing a work case according to another embodiment;

EMBODIMENT OF THE INVENTION Below, embodiment of the branching-flow-path closure method including the removal method of the branching-flow-path closure apparatus and the branching-flow-path closure apparatus which concern on this invention is described based on drawing. In this embodiment, an example will be described in which a branch flow channel blocking device is used to renew air valves and gate valves that constitute a fluid device. However, without being limited to the following embodiments, various modifications are possible without departing from the scope of the invention. In the following description, the direction of gravity may be referred to as the bottom, and the direction opposite to the direction of gravity may be referred to as the top.

As shown in FIG. 1, the upstream side (lower side) of the gate valve 3 is connected to the connecting flange portion 2c of the branch pipe portion 2 formed so as to protrude radially outward in the middle of the water pipe 1 (an example of the fluid pipe). The flange portion 3a is detachably fixed by bolts and nuts in a sealed state. A connection flange portion 6a of an air valve 6 (existing fluid device) is tightly tightened and fixed to a connection flange portion 3b on the downstream side (upper side) of the gate valve 3 with bolts and nuts.

In the present embodiment, a branch flow path blockage device X, which will be described later, is used for reasons such as water leakage or failure due to deterioration or reaching the set service life while maintaining the water supply flow in the water pipe 1. Then, the existing gate valve 3 and air valve 6 are replaced with new repair valve 8 and air valve 9 (new fluid equipment) (see FIG. 15).

FIG. 2 shows a side cross-sectional view of the branch channel blocking device X. As shown in FIG. The branch channel closing device X closes the channel of the branch pipe section 2 branched from the water pipe 1 described above (see also FIG. 11). The branch channel blocking device X includes a locking mechanism 4 locked to the connecting portion 2a between the branch pipe portion 2 and the water pipe 1, a sealing mechanism 5 capable of blocking the flow channel of the branch pipe portion 2, and a locking mechanism. A shaft member 7 that supports the mechanism 4 and the seal mechanism 5 and is composed of an inner cylinder shaft 7A and an outer cylinder shaft 7B, and a holding member 15 that holds the shaft member 7 are provided. Although the details will be described later, the seal mechanism 5 in this embodiment has a fluid inflow portion 51 into which air (an example of fluid) flows. and closes the flow path of the branch pipe portion 2 .

The locking mechanism 4 is provided at the upstream end (lower end), and includes a plate-like member 41 with which the tip of the inner cylinder shaft 7A abuts to restrict movement, and the plate-like member 41 is fixed to the inner cylinder shaft 7A. a guide member 42 movably inserted therein, a spring 43 disposed inside the guide member 42 , and a plurality of springs 43 connected to the outside of the guide member 42 in a radial direction so as to swing freely. In the embodiment, two locking links 44 are provided in the circumferential direction.

The plate-like member 41 is fixed to the upstream end surface (lower surface) of the guide member 42 (a rod-like member 42a to be described later). The downward movement of the inner cylinder shaft 7A is restricted by the contact of the tip of the inner cylinder shaft 7A moved by the biasing force of the spring 43 with the downstream end surface (upper surface) of the plate member 41 . One ends of a pair of locking links 44 on the upstream side are pivotally connected to the left and right ends of the plate-like member 41 so as to be swingable.

The guide member 42 includes a plurality of (four in this embodiment) rod-shaped members 42a each having one end fixed to a tip plate 55 (to be described later) and the other end fixed to the plate-shaped member 41. and a slide member 42b which is slidably movable in the axial direction while being supported by the body. A portion of the movable inner cylindrical shaft 7A and a spring 43 arranged on the outer peripheral side of the inner cylindrical shaft 7A are accommodated inside the plurality of rod-shaped members 42a. Further, the other ends of the pair of locking links 44 on the downstream side are pivotally connected to the right and left ends of the slide member 42b so as to be swingable.

As shown from the left diagram to the center diagram of FIG. 8, the locking link 44 can extend to the diameter-expanding posture in conjunction with the downstream (upward) movement of the inner cylinder shaft 7A. The locking link 44 in the diameter-expanding posture is located on the inner peripheral wall surface of the branch pipe portion 2 on the upstream side of the location where the branch flow channel is blocked by the seal mechanism 5, that is, the branch flow channel opening peripheral edge of the inner peripheral surface of the branch pipe portion 2 ( It engages against the connecting part 2a). At this time, the tip of the inner cylindrical shaft 7A is kept separated from the plate member 41 by the release prevention mechanism 10, which will be described later.

As shown in FIGS. 2 and 7, the sealing mechanism 5 includes a pair of upper annular members 5A, a pair of lower annular members 5B, a hollow tubular member 54, a tip plate 55, an upper annular member 5A and a lower annular member. 5C and an elastic member 5C arranged between the elastic member 5B.

The pair of upper annular members 5A is composed of a first disk-shaped member 5Aa (first annular member) and a plurality of (eight in this embodiment) hexagon socket head bolts or the like for the first disk-shaped member 5Aa. and a first water stop fitting 5Ab (first support portion) connected by a drawing bolt 52 . The pair of lower annular members 5B are connected to a second disk-shaped member 5Ba (second annular member) by a plurality of (eight in this embodiment) clamping bolts 53, 55a to the second disk-shaped member 5Ba. and a second water stop fitting 5Bb (second support portion). The first water stop fitting 5Ab and the second water stop fitting 5Bb in this embodiment have a divided structure that allows relative movement by screwing together the pull bolt 52 and/or the pull bolts 53, 55a. .

As shown in FIG. 7, the first disk-shaped member 5Aa is integrally formed of a base portion 56a having a concave upstream end surface (lower surface) and an extension portion 56b extending downstream (upper side) from the base portion 56a. formed. In the base portion 56a, a plurality of (eight in this embodiment) through holes 56a1 into which the pulling bolts 52 are inserted are formed at equal intervals in the circumferential direction in an annular portion adjacent to the extending portion 56b. An inner peripheral seal member sa attached to the inner peripheral surface of the holding member 15 is in contact with the outer peripheral surface of the extending portion 56b, and the inner cylindrical shaft 7A faces the inner peripheral surface of the extending portion 56b. ing. A male threaded portion 56b1 is formed on the outer peripheral surface of the downstream end (upper end) of the extension portion 56b, and the male threaded portion 56b1 is fitted to the inner peripheral surface of the upstream end (lower end) of the outer cylindrical shaft 7B. The first disk-shaped member 5Aa and the outer cylindrical shaft 7B are connected by screwing the female threaded portion 7Ba formed in the first. That is, the first disk-shaped member 5Aa is supported by the outer cylindrical shaft 7B. In addition, a seal groove 56b2 in which an O-ring sb is mounted is formed on the outer peripheral surface of the downstream end (upper end) of the extension 56b upstream (lower) than the male threaded portion 56b1. A tapered surface 56b5 for compressing the O-ring sh is formed on the downstream side (upper side) of the portion 56b1.

A female threaded portion 56b3 is formed on the inner peripheral surface of the upstream end (lower end) of the extending portion 56b, and a male thread is formed on the outer peripheral surface of the downstream end (upper end) of the hollow cylindrical member 54. The first disk-shaped member 5Aa and the hollow cylindrical member 54 are connected by being screwed together with the portion 54a. That is, the hollow tubular member 54 is also supported by the outer tubular shaft 7B via the first disk-shaped member 5Aa. A seal groove 56b4 in which an O-ring sc is mounted is formed on the inner peripheral surface of the upstream end (lower end) of the extending portion 56b downstream (upper) of the female screw portion 56b3. In this O-ring sc, the tapered surface 54a1 formed at the downstream end (upper end) of the male threaded portion 54a of the hollow cylindrical member 54 is formed by connecting the first disk-shaped member 5Aa and the hollow cylindrical member 54. abutted and compressed.

The first water stop fitting 5Ab is formed in a cup shape, and is integrally formed with a disc base portion 57a and a cylindrical portion 57b extending upstream (downward) from the outermost peripheral side of the disc base portion 57a. The disk base 57a has an insertion hole 57a1 through which the hollow cylindrical member 54 is inserted, and a first stepped portion 57a2 with which one end of the elastic member 5C is engaged on the outermost side. A seal groove 57a3 in which an O-ring sd is mounted is formed on the outer peripheral side adjacent to the insertion hole portion 57a1 of the disc base portion 57a, and the pull-up bolt 52 is further provided on the outer peripheral side of the seal groove 57a3. A plurality of (eight in this embodiment) female screw holes 57a4 to be screwed together are formed at regular intervals in the circumferential direction. The cylindrical portion 57b is adjacent to the outside of the second water stop fitting 5Bb, and serves as an outer cylinder into which the second water stop fitting 5Bb is inserted.

The downstream end surface (upper surface) of the second disk-shaped member 5Ba is formed in a concave shape. The second disk-shaped member 5Ba has an insertion hole 58a formed through the center thereof into which the hollow cylindrical member 54 is inserted. A plurality of (eight in this embodiment) through holes 58b into which the offset bolts 53 and 55a are inserted are formed at regular intervals in the circumferential direction. The inner peripheral surface of the insertion hole portion 58a has a seal groove 58a1 in which the O-ring sj is mounted, and a locking recess 58a2 in which the hollow cylindrical member 54 is locked on the upstream side (lower side) of the seal groove 58a1. is formed. That is, the second disk-shaped member 5Ba is also supported by the outer cylindrical shaft 7B via the first disk-shaped member 5Aa and the hollow cylindrical member 54. As shown in FIG.

The second water stop fitting 5Bb has an insertion hole 59a through which the hollow cylindrical member 54 is inserted, and a second stepped portion 59b with which the other end of the elastic member 5C engages on the outermost side. It is A seal groove 59c in which an O-ring sf is mounted is formed on the outer peripheral side adjacent to the insertion hole portion 59a. A plurality of (eight in this embodiment) female screw holes 59d are formed at equal intervals in the circumferential direction. The second water stop fitting 5Bb is adjacent to the inside of the cylindrical portion 57b of the first water stop fitting 5Ab, and serves as an inner cylinder into which the cylindrical portion 57b is fitted.

A pair of upper annular members 5A and a pair of lower annular members 5B are externally inserted into the hollow tubular member 54, and an inner tubular shaft 7A is inserted therein. A plurality of through-holes are formed in the vicinity of the center in the axial direction of the hollow cylindrical member 54 as the fluid inflow portion 51 that communicates with the fluid introduction space A for expanding the elastic member 5C. One end of the hollow cylindrical member 54 is formed with a male threaded portion 54a that is screwed into a female threaded portion 56b3 formed in the extending portion 56b of the first disk-shaped member 5Aa. An annular projecting portion 54b is formed to engage with a locking recess 58a2 formed in the member 5Ba. The hollow tubular member 54 is inserted into the first waterproof fitting 5Ab and the pair of lower annular members 5B, and the annular projecting portion 54b and the locking recessed portion 58a2 are engaged with each other. The first disk-shaped member 5Aa and the second disk-shaped member 5Ba are positioned by screwing the member 5Aa. Further, the hollow cylindrical member 54 is prevented from falling by the tip plate 55 fixed to the second disk-shaped member 5Ba by a plurality of (four in this embodiment) pull bolts 55a composed of hexagon socket head bolts or the like. .

The tip plate 55 has an insertion hole 55b through which the inner cylindrical shaft 7A is inserted. A plurality of (four in this embodiment) through-holes (not shown) into which the male screws of the pull-up bolts 55a are inserted are alternately arranged in the circumferential direction. Further, the rod-like member 42a of the guide member 42 is screwed to the upstream end face (lower face) of the tip plate 55 (see also FIG. 2), and the downstream end face (upper face) of the tip plate 55 has an insertion hole. A seal groove 55d in which an O-ring sg is mounted is formed between the portion 55b and the through hole 55c. A seal groove 55e in which an outer peripheral seal member si is mounted is formed in the inner peripheral surface of the insertion hole portion 55b, and the outer peripheral seal member si is in close contact with the inner cylindrical shaft 7A.

The elastic member 5C is made of a highly durable synthetic rubber such as ethylene propylene diene rubber (EPDM). a second clamped portion 62 clamped by the annular member 5B; an expansion portion 63 that connects the first clamped portion 61 and the second clamped portion 62 and expands when air flows in from the fluid inflow portion 51; ,have.

The first pinched portion 61 is bent inward from the expansion portion 63 to have an L-shaped cross section, and similarly, the second pinched portion 62 is bent inward from the expansion portion 63 to have an L-shaped cross section. . By engaging the first pinched portion 61 with the first stepped portion 57a2 of the first water stop fitting 5Ab and engaging the second pinched portion 62 with the second stepped portion 59b of the second water stop fitting 5Bb, , one end of the elastic member 5C is supported by the first water stop fitting 5Ab, and the other end of the elastic member 5C is supported by the second water stop fitting 5Bb. The expanded portion 63 has a bent and deformed shape in its natural state, and the tightening bolt 52 and/or the tightening bolts 53, 55a are further tightened to separate the first water stop fitting 5Ab and the second water stop fitting 5Bb. This results in an upright shape.

A procedure for correcting the posture of the elastic member 5C will be described. The first pinched portion 61 is engaged with the first stepped portion 57a2 of the first water stop fitting 5Ab, and the second pinched portion 62 is engaged with the second stepped portion 59b of the second water stop fitting 5Bb to form a hollow The cylindrical member 54 is mounted inside the pair of upper annular members 5A and the pair of lower annular members 5B, and temporarily tightened with the tightening bolt 52 and tightening bolts 53, 55a. In this state, the first water stop fitting 5Ab and the second water stop fitting 5Bb are close to each other, and the expanded portion 63 is bent and deformed. Next, by further tightening the pull bolt 52 and the pull bolts 53, 55a, the first water stop fitting 5Ab comes into contact with the first disc-shaped member 5Aa and the second water stop fitting 5Bb contacts the second disc-shaped member 5Ba. By abutting, the first water stop fitting 5Ab and the second water stop fitting 5Bb are separated. As a result, a tensile force is applied to the inflatable portion 63, and the inflatable portion 63 assumes an upright shape. With this configuration, a sealed space surrounded by the hollow tubular member 54, the first water stop fitting 5Ab, and the second water stop fitting 5Bb serves as the fluid introduction space A. As shown in FIG.

As shown in the right diagram of FIG. 8, air introduced into the fluid introduction space A from the outer cylinder shaft 7B through the fluid inlet portion 51 causes the expansion portion 63 to receive fluid pressure and expand radially outward. Thus, by separating the first water stop fitting 5Ab and the second water stop fitting 5Bb while supporting the elastic member 5C and applying tension to the elastic member 5C, deformation of the elastic member 5C before expansion is prevented. becomes possible. As a result, when the elastic member 5C is inflated by allowing air to flow in from the fluid inflow portion 51, the elastic member 5C can be inflated evenly, and the flow path of the branch pipe portion 2 can be reliably closed. can. The expansion rate and strength of the expansion portion 63 are designed according to the structure and inner diameter of the branch pipe portion 2 .

Returning to FIG. 2, the inner cylindrical shaft 7A is composed of a solid rod-like member axially penetrating the central portion of the holding member 15 fixed to the divided plate-like member 31 of the work case 30, which will be described later, in a sealed state. there is Since the height of the work space from the upper surface of the air valve 6 to the ceiling wall R of the structure is limited, the divided inner cylinder is divided into a plurality of pieces in the axial direction corresponding to the limited height of the work space. It is composed of shafts 7A1 and 7A2. The inner cylinder shaft 7A has a first split inner cylinder shaft 7A1 (an example of a first shaft member) provided with a locking mechanism 4 and a seal mechanism 5, and a male-female screw thread to the upper end of the first split inner cylinder shaft 7A1. and a second divided inner cylinder shaft 7A2 (an example of a first shaft member) connected by a connecting portion 11 configured by connection. Further, it is possible to further connect a split operation shaft (an example of a second shaft member) to the upper end portion of the second split inner cylinder shaft 7A2.

The outer cylindrical shaft 7B is formed of a hollow rod-shaped member that penetrates the central portion of a holding member 15 that is fixed to a divided plate-shaped member 31 of a work case 30 (to be described later) so as to be slidable in the axial direction in a sealed state. The inner cylinder shaft 7A is inserted in the outer cylinder shaft 7B with the same axial center Y as the inner cylinder shaft 7A, and the fluid communicating with the fluid inflow portion 51 is formed in the gap between the inner cylinder shaft 7A and the outer cylinder shaft 7B. A flow path F is formed.

Like the inner cylinder shaft 7A, the outer cylinder shaft 7B is composed of a plurality of outer cylinder shafts 7B1 and 7B2 divided in the axial direction corresponding to the restricted height of the working space. The outer cylindrical shaft 7B is connected to the seal mechanism 5 by screwing a female threaded portion 7Ba formed on the inner peripheral surface of the upstream end (lower end) to the male threaded portion 56b1 of the first disk-shaped member 5Aa. ing. The outer cylindrical shaft 7B includes a first divided outer cylindrical shaft 7B1 (an example of a first shaft member) provided with the locking mechanism 4, the sealing mechanism 5, and the holding member 15, and the upper end of the first divided outer cylindrical shaft 7B1. and a second split outer cylindrical shaft 7B2 (an example of a first shaft member) connected to the portion by a connecting portion 12 configured by male-female screw connection. A coupler 13a for supplying air from a fluid supply mechanism 13 such as an air feeder is connected to the upper end of the second split outer cylinder shaft 7B2. In addition, it is possible to further connect a split operation shaft (an example of a second shaft member) to the upper end portion of the second split outer cylinder shaft 7B2.

A release prevention mechanism 10 is provided over the inner cylinder shaft 7A and the outer cylinder shaft 7B to prevent the locking mechanism 4 from being unlocked. The release prevention mechanism 10 includes a male threaded portion 7Aa formed at the downstream end (upper end) of the inner cylindrical shaft 7A, an operation nut 10A screwed onto the male threaded portion 7Aa, and a downstream end surface ( and a bearing 7Bb arranged on the upper surface) for supporting the rotation of the operation nut 10A. Further, the locking mechanism 4 is configured such that the diameter of the pair of locking links 44 can be expanded by rotating the operation nut 10A. By rotating the operation nut 10A while sliding it on the bearing 7Bb, the inner cylindrical shaft 7A rises and the diameter of the pair of locking links 44 expands. It engages against the rim of the branch channel opening (see also Figure 11). When the operation nut 10A becomes unrotatable, the locking of the locking mechanism 4 is completed, and the unlocking of the locking mechanism 4 is prevented by the operating nut 10A and the male screw portion 7Aa. In this manner, if the diameter of the locking mechanism 4 is expanded by rotating the operating nut 10A, the operability is excellent, and it is easy to confirm the completion of locking of the locking mechanism 4 when the operating nut 10A becomes unrotatable. . Note that the bearing 7Bb as the release prevention mechanism 10 may be omitted, and the operation nut 10A and the downstream end surface (upper surface) of the outer cylindrical shaft 7B may be brought into sliding contact.

The holding member 15 holds the outer cylindrical shaft 7B, and is composed of a disk-shaped member fixed to a divided plate-shaped member 31 of the work case 30 described later with a fixing bolt 24C. The holding member 15 has an outer cylinder shaft through-hole 15a formed in the central portion thereof into which the outer cylinder shaft 7B is inserted. An inner peripheral seal member sa is mounted on the inner peripheral surface of the outer cylindrical shaft through-hole 15a, and the outer cylindrical shaft 7B is held in a sealed state with respect to the holding member 15 by the inner peripheral seal member sa. . An outer peripheral seal member se is provided in the annular groove of the outer peripheral surface of the holding member 15 to prevent water leakage from the gap between the work case 30 and the holding member 15 .

The above-described branch flow channel blocking device X includes a work case 30 that is detachably connected to the gate valve 3 . The work case 30 includes a connecting flange portion 30a connected to the connecting flange portion 3b on the downstream side (upper side) of the gate valve 3, and extends in the axial center Y direction of the shaft member 7 from the inner peripheral side of the connecting flange portion 30a. It is a housing having a tubular body 30b and an annular projecting portion 30c annularly projecting outward from the end portion of the tubular body 30b opposite to the connecting flange portion 30a. A drain valve 22 is connected to the side wall of the work case 30 for discharging rust nodules and the like scraped by a cleaning tool (not shown) to the outside (see also FIG. 6).

The work case 30 in this embodiment is a divided body composed of a first divided case 30A and a second divided case 30B divided along the axis Y direction of the shaft member 7. The shaft member 7 is sandwiched in a sealed state.

As shown in FIG. 3, a side wall of the first split case 30A is provided with a pipe 22a connected to the drain valve 22 described above. The first split case 30A includes a first half-split member 30Aa, a pair of first projecting portions 30Ab protruding radially outward from both ends of the first half-split member 30Aa in the circumferential direction, and the gate valve 3 The first connecting flange portion 30Ac connected to the downstream (upper) connecting flange portion 3b (an example of the flange) and the first connecting flange portion 30Ac are located on the opposite side, and a divided plate-like member 31 described later is The first annular projecting portion 30Ad is connected, and the first half-split member 30Aa, the first projecting portion 30Ab, the first connecting flange portion 30Ac, and the first annular projecting portion 30Ad are integrally formed. there is The second split case 30B includes a split second half member 30Ba, a pair of second protrusions 30Bb that protrude radially outward from both ends of the second split member 30Ba in the circumferential direction, and the gate valve 3 The second connecting flange portion 30Bc connected to the downstream (upper) connecting flange portion 3b (an example of a flange) is located on the opposite side of the second connecting flange portion 30Bc, and a divided plate-shaped member 31 described later is The second half-split member 30Ba, the second projecting portion 30Bb, the second connecting flange portion 30Bc, and the second annular projecting portion 30Bd are integrally formed. there is

The first connection flange portion 30Ac and the second connection flange portion 30Bc are provided with a plurality of bolts and nuts for connection to the downstream (upper) connection flange portion 3b of the gate valve 3 (in this embodiment, four and two, respectively). combination) through holes are formed. A plurality of (eight in this embodiment) through holes are formed in the first protruding portion 30Ab and the second protruding portion 30Bb to connect with each other by bolts B configured by hexagon socket head bolts (Fig. 5). The first annular projecting portion 30Ad and the second annular projecting portion 30Bd are provided with a plurality of (a combination of four and two in the present embodiment) to be connected to the divided plate member 31 by connecting members 33 composed of bolts and nuts. of through-holes are formed.

Thus, the connecting flange portion 30a of the work case 30 is composed of the first connecting flange portion 30Ac of the first split case 30A and the second connecting flange portion 30Bc of the second split case 30B. The cylindrical main body 30b of the work case 30 includes a first split member 30Aa and a pair of first protrusions 30Ab of the first split case 30A, and a second split member 30Ba and a pair of second protrusions of the second split case 30B. and a part 30Bb. The annular projecting portion 30c of the work case 30 is composed of a first annular projecting portion 30Ad of the first split case 30A and a second annular projecting portion 30Bd of the second split case 30B.

One of the pair of first projecting portions 30Ab has a first linear seal groove 30Ab1 formed on the mating surface 30Ab2 with the second projecting portion 30Bb. A first semicircular seal groove 30Ac1 is formed in the surface facing the upper side) connecting flange portion 3b. One of the pair of second projecting portions 30Bb has a second linear seal groove 30Bb1 formed on the mating surface 30Bb2 with the first projecting portion 30Ab. A second semicircular seal groove 30Bc1 is formed on the surface facing the (upper) connecting flange portion 3b.

A first seal member S1 is fitted in the first linear seal groove 30Ab1 and the first semicircular seal groove 30Ac1. Two seal members S2 are fitted. The first seal member S1 includes a first linear seal portion S1a fitted in the first linear seal groove 30Ab1, and a first semicircular portion S1b of an annular seal fitted in the first semicircular seal groove 30Ac1. are formed in close contact with each other. Similarly, the second seal member S2 includes a second linear seal portion S2a fitted in the second linear seal groove 30Bb1 and a second annular seal portion S2a fitted in the second semicircular seal groove 30Bc1. It is formed in close contact with the semicircular portion S2b. That is, the connecting flange portion 3b on the downstream side (upper side) of the gate valve 3 in the mating surfaces 30Ab2 and 30Bb2 of the first projecting portion 30Ab and the second projecting portion 30Bb, and the first connecting flange portion 30Ac and the second connecting flange portion 30Bc Sealing members S1 and S2 are arranged continuously on the facing surface.

As shown in FIG. 2, the branch flow path blocking device X in this embodiment further includes a divided plate member 31 that is connected to the annular projecting portion 30c of the work case 30 and divided into half disk shapes. The divided plate member 31 functions as a part of the work case 30 by being connected to the annular projecting portion 30c. The shaft member 7 is sandwiched between divided portions of the divided plate member 31 in a sealed state. In other words, the shaft member 7 is sandwiched in a sealed state between divided portions of the divided plate-like member 31 as a divided body of the work case 30 .

As shown in FIG. 4, the divided plate-like member 31 is composed of a first plate-like member 31A and a second plate-like member 31B each having a half disc shape. The first plate-like member 31A includes a first semicircular portion 31Aa facing the annular projecting portion 30c of the work case 30, and a pair of projections projecting from the inner end of the first semicircular portion 31Aa to the opposite side of the annular projecting portion 30c. It is integrally formed with the first block portion 31Ab. The second plate member 31B includes a second semicircular portion 31Ba facing the annular projecting portion 30c of the work case 30, and a pair of protruding portions projecting from the inner end of the second semicircular portion 31Ba to the opposite side of the annular projecting portion 30c. It is integrally formed with the second block portion 31Bb. The first plate-like member 31A and the second plate-like member 31B are formed by a plurality of hexagon socket bolts (this embodiment 4) are connected by fastening members 32 to form a divided plate member 31 (see also FIG. 6).

An annular recess 31a for accommodating the holding member 15 is formed in the center of the bottom surface of the divided plate member 31, and an annular seal groove 31b into which the annular seal member S3 is fitted is formed on the outer peripheral side of the annular recess 31a. formed. On the inner peripheral side of the divided plate-shaped member 31, a plurality of (two in this embodiment) inner circumferences into which fixing bolts 24C for fixing the later-described holding plate 24A, the divided plate-shaped member 31 and the holding member 15 are inserted. A side through hole 31c is formed. On the outer peripheral side of the divided plate-shaped member 31, a plurality of connecting members 33 (in the present embodiment, four and two in combination) are inserted, which are composed of bolts and nuts for connecting to the annular projecting portion 30c of the work case 30. ) are formed in the outer peripheral side through hole 31d. The plurality of outer peripheral side through holes 31 d are two types of concentric holes according to the dimensions of the work case 30 . A central through-hole 31 e through which the shaft member 7 passes is formed at the innermost peripheral side (center) of the divided plate member 31 .

As shown in FIG. 2, on the divided plate-like member 31 of the work case 30, a lowering control mechanism is provided to prevent the shaft member 7, to which the locking mechanism 4, the sealing mechanism 5 and the holding member 15 are attached, from lowering due to its own weight. A fitting 24 is provided. The descent restrictor 24 is divided into a pair of clamping plates 24A capable of clamping and fixing the inner cylinder shaft 7A and the outer cylinder shaft 7B, a hexagon socket bolt 24B for clamping and fixing both clamping plates 24A in a clamping state, and the clamping plate 24A. A fixing bolt 24</b>C that fixes the plate member 31 and the holding member 15 together.

As shown in FIGS. 5 and 6, the work case 30 in this embodiment has a first split case 30A, a second split case 30B, a first plate member 31A, and a second plate member 31B. . The first split case 30A and the second split case 30B are connected by a plurality of (eight in this embodiment) bolts B, and a plurality of (in this embodiment A divided plate-shaped member 31 integrated by four fastening members 32 is connected to a first divided case 30A and a second divided case 30B by a plurality of (four in this embodiment) connecting members 33. . In addition, the split surfaces of the first split case 30A and the second split case 30B and the split surfaces of the first plate member 31A and the second plate member 31B are orthogonal to each other. Accordingly, the block portions 31Ab and 31Bb of the divided plate-like member 31 can be arranged without interfering with the descent restricting member 24 .

Next, a method for closing a branched flow path, including a method for removing the branched flow path blocking device X, will be described with reference to FIGS. 9 to 16. FIG.

As shown in FIG. 9, the method of closing the branch flow path includes a temporary blocking step of blocking the flow path of the branch pipe portion 2 by the existing gate valve 3, and after the temporary blocking step, the existing valve connected to the branch pipe portion 2. and a shaft member in which the locking mechanism 4 and the sealing mechanism 5 are connected to the branch pipe portion 2 from which the air valve 6 has been removed, as shown in FIG. 11, after opening the sluice valve 3, the shaft member 7 is operated to move the locking mechanism 4 to the branch pipe portion 2 as shown in FIG. and a closing step of closing the flow path of the branch pipe portion 2 by supplying air to the inside of the elastic member 5C. .

12, after the closing step, the branch flow path closing method includes a first removal step of removing the work case 30 while leaving the branch flow passage closing device X, and , after the first removal step, a first installation step of installing the repair valve 8 (new fluid device) and the work case 30 in the branch pipe portion 2; A second removal step of closing the flow path of the branch pipe portion 2 with the valve 8 and removing the branch flow path blocking device X, and as shown in FIG. and a second installation step.

The method for removing the branch flow channel blocking device X in the present embodiment includes a blocking step and a first removing step. are removed in a direction intersecting the direction of the axis Y, and after the case removal step, the third split inner cylinder shaft 7A3 and the third split outer cylinder shaft 7B3 (an example of the second shaft member) are removed, and then the partition and a gate valve removal step of removing the valve 3 along the axis Y direction.

As shown in FIG. 9 , in the temporary closing step, the valve body 3 c of the existing gate valve 3 is moved to close the flow path of the branch pipe portion 2 . If the valve body 3c is fixed and cannot be moved due to aging of the existing gate valve 3, a tightening ring (not shown) is attached to the outer peripheral surfaces of the connecting flanges 2c and 3a. This clamping ring has a pair of semicircular clamping split rings (not shown) and a partition plate valve (not shown). Pull and fix a pair of clamping split rings with bolts and nuts. By inserting the valve plate of the partition plate valve between the connecting flange portions 2c and 3a, the flow path of the branch pipe portion 2 is closed.

After blocking the flow path of the branch pipe portion 2, the existing air valve 6 is removed in a removing step. Although not shown, after the temporary closing step, the work case 30 equipped with a cleaning device is attached to the connecting flange portion 3b on the downstream side of the gate valve 3, and the inner surface of the branch pipe portion 2 is cleaned. At this time, if the valve body 3c of the existing gate valve 3 is fixed and cannot be moved, a working gate valve (not shown) is installed between the work case 30 and the gate valve 3.

Next, as shown in FIG. 10, in the mounting step, the connection flange portion 30a of the work case 30 is fixed to the downstream connection flange portion 3b of the gate valve 3 with bolts and nuts. The locking mechanism 4 and the sealing mechanism 5 are accommodated inside the work case 30 , and the shaft member 7 (outer cylindrical shaft 7 B) that supports the locking mechanism 4 and the sealing mechanism 5 is held by the holding member 15 . , and is clamped and fixed by a lowering restrictor 24 . At this time, as shown in the left diagram of FIG. 8, the first water stop fitting 5Ab is in contact with the first disk-shaped member 5Aa, and the second water stop fitting 5Bb is in contact with the second disk-shaped member 5Ba. The expansion part 63 of the mechanism 5 is housed inside the work case 30 in an upright configuration. In this mounting step, the first split case 30A and the second split case 30B and the first plate-like member 31A and the second plate-like member 31B that constitute the work case 30 may be assembled on site, or as described above. Alternatively, a pre-assembled work case 30 may be used.

Next, as shown in FIG. 11, after opening the gate valve 3 and loosening the hexagon socket bolt 24B of the lowering regulator 24, the shaft member is lowered manually or by a lowering tool such as a lever block (registered trademark) (not shown). 7 is operated to lower the locking mechanism 4 and the sealing mechanism 5 . Then, until the upper ends of the second split inner cylinder shaft 7A2 and the second split outer cylinder shaft 7B2 (an example of the first shaft member) are positioned on the split plate member 31 of the work case 30, the locking mechanism 4 and the seal mechanism are engaged. 5 descends, the third divided inner cylinder shaft 7A3 and the third divided outer cylinder shaft 7B3 (an example of the second shaft member) are connected to the second divided inner cylinder shaft 7A2 and the second divided outer cylinder shaft 7B2. Next, after manually operating the third split inner cylinder shaft 7A3 and the third split outer cylinder shaft 7B3 until the locking mechanism 4 is positioned at the branch flow path opening peripheral edge (connecting portion 2a) of the branch pipe portion 2, A fourth split inner cylinder shaft 7A4 (second shaft member (example of second shaft member), and fourth split outer cylindrical shaft 7B4 (example of second shaft member) to which coupler 13a and bearing 7Bb are mounted. Thus, even when the height of the working space to the ceiling wall R of the structure is limited, by using the shaft member 7 divided into a plurality of parts corresponding to the limited height of the working space, Work efficiency can be improved.

Next, in the locking step, the operation nut 10A is rotated while being slidably contacted with the bearing 7Bb disposed on the downstream end surface (upper surface) of the fourth split outer cylinder shaft 7B4, thereby pulling up the inner cylinder shaft 7A. The locking mechanism 4 is locked to the branch channel opening peripheral edge (connecting portion 2 a ) of the branch pipe portion 2 . More specifically, by moving the inner cylinder shaft 7A downstream (upward), the locking link 44 of the locking mechanism 4 is placed in a diameter-expanded posture, and the branch flow path of the inner peripheral surface of the branch pipe portion 2 is opened. Engage against the opening rim. Since the operation nut 10A becomes unrotatable, the locking of the locking mechanism 4 is completed, and the unlocking of the locking mechanism 4 is prevented by the operating nut 10A and the male screw portion 7Aa. Next, the hexagon socket head bolt 24B of the lowering restrictor 24 is tightened to clamp and fix the shaft member 7 (outer cylindrical shaft 7B). As a result, the descent restrictor 24 prevents the shaft member 7 (outer cylinder shaft 7B) from falling due to its own weight.

Next, in the closing step, air is supplied to the inside of the elastic member 5C to close the flow path of the branch pipe portion 2. As shown in FIG. More specifically, air is supplied from the fluid supply mechanism 13 through the coupler 13a to the fluid flow path F in the gap between the outer cylinder shaft 7B and the inner cylinder shaft 7A, and the air is supplied from the fluid inflow portion 51 to the fluid introduction space A. is introduced (see also the right figure in FIG. 8). As a result, the expansion portion 63 receives the fluid pressure and expands radially outward, and adheres tightly to the inner surface of the branch pipe portion 2 to block the flow path of the branch pipe portion 2 . As described above, in the closing step of the present embodiment, a large driving force such as a hydraulic jack is not required, and it is only necessary to supply air from the fluid inlet portion 51, so that work efficiency can be improved. Moreover, if the seal mechanism 5 is composed of the elastic member 5C that expands by the fluid pressure, it becomes possible to freely change the amount of expansion simply by changing the fluid pressure. It can correspond to the branch pipe portion 2 having an inner diameter.

Next, as shown in FIG. 12, in the first removal step, the work case 30 and the gate valve 3 are removed with a part of the branch channel blocking device X left. More specifically, the first removal step includes, after the closing step, a case removal step of removing the work case 30 connected to the gate valve 3 in a direction intersecting the axis Y direction, and after the case removal step, a second A gate valve removing step of removing the gate valve 3 along the axis Y direction after removing the third divided inner cylinder shaft 7A3 and the third divided outer cylinder shaft 7B3.

In the case removing step, the fixing bolts 24C of the divided plate-shaped member 31 of the work case 30 are removed to release the fixed between the divided plate-shaped member 31 and the holding member 15, and the first plate-shaped member 31A and the second plate-shaped member are separated. The fastening member 32 connecting 31B is removed, and the divided plate member 31 is removed. Then, the bolt B connecting the first split case 30A and the second split case 30B is removed, and the work case 30 is removed from the direction intersecting the axis Y direction. In this way, since the work case 30 is removed to the side of the shaft member 7, there is no need to remove the work case 30 from the upper end of the shaft member 7 along the axial center Y direction. The work case 30 can be removed without interfering with the obstacle even in a place where there is an obstacle.

Next, in the gate valve removing step, the fourth divided inner cylinder shaft 7A4 and the fourth divided outer cylinder shaft 7B4 (an example of the second shaft member), the third divided inner cylinder shaft 7A3 and the third divided outer cylinder shaft 7B3 (second An example of a shaft member) is removed in order. At this time, the shaft members 7 are sequentially moved using a jig (not shown) that applies downward force to the outer cylindrical shaft 7B so that the seal mechanism 5 does not move due to the fluid pressure of the clean water in the water pipe 1. preferably removed. Next, the bolts and nuts that fix the connection flange portion 2c of the branch pipe portion 2 and the upstream connection flange portion 3a of the gate valve 3 are removed, and the gate valve 3 is removed along the axis Y direction. At this time, by locking the locking mechanism 4 to the connecting portion 2a between the branch pipe portion 2 and the water pipe 1, upward movement of the shaft member 7 (inner cylinder shaft 7A) due to fluid pressure is prevented. The downward movement of the shaft member 7 is prevented by supplying air to the seal mechanism 5 to block the flow path of the branch pipe portion 2 . Since the shaft member 7 is split in this way, the gate valve 3 can be removed without interfering with obstacles by removing at least the fourth split inner cylinder shaft 7A4 and the fourth split outer cylinder shaft 7B4. Although not shown, it is preferable to attach the release prevention mechanism 10 to the upper ends of the second split inner cylinder shaft 7A2 and the second split outer cylinder shaft 7B2.

In addition, as shown in FIG. 16, in a state in which the first split outer cylinder shaft 7B1 and the first split outer cylinder shaft 7B1 are sandwiched between the holding member 15 and the split plate member 31 removed in the first removal step, It is preferable to provide a lowering restrictor 24 that connects the divided plate member 31 to the connecting flange portion 2c of the branch pipe portion 2 and prevents the shaft member 7 from lowering due to its own weight. The holding member 15 and the divided plate-shaped member 31 function as a rise restrictor that restricts movement of the seal mechanism 5 under the fluid pressure of the clean water in the water pipe 1 . In this way, since the divided plate-shaped member 31 connected to the annular projecting portion 30c is separately provided, after the work case 30 and the gate valve 3 are removed, the divided plate-shaped member 31 serves to open the branch pipe portion 2. The shaft member 7 can be sandwiched so as to cover it, and the sealing function of the sealing mechanism 5 can be stabilized.

Next, as shown in FIG. 13, in the first installation process, after the first removal process, a new repair valve 8 is fastened to the branch pipe portion 2 with bolts and nuts and installed, and the work case 30 is newly installed. The repair valve 8 is fastened with bolts and nuts and installed. In this first installation step, the first split case 30A and the second split case 30B and the first plate-like member 31A and the second plate-like member 31B, which constitute the work case 30, may be assembled on site, or they may be assembled in advance. An assembled work case 30 may also be used. When assembling the work case 30 on site, after attaching the new repair valve 8 to the branch pipe portion 2, the third split inner cylinder shaft 7A3, the third split outer cylinder shaft 7B3, the fourth split inner cylinder shaft 7A4 and the fourth split inner cylinder shaft 7A4 are assembled. Since the work case 30 can be assembled after connecting the quartered outer cylinder shaft 7B4 to the second divided inner cylinder shaft 7A2 and the second divided outer cylinder shaft 7B2, work efficiency is improved.

Then, the divided plate member 31 of the work case 30 and the holding member 15 are fixed by the fixing bolts 24C, and the inside of the work case 30 is maintained in a sealed state. Next, the operation nut 10A screwed to the inner cylindrical shaft 7A is loosened, the inner cylindrical shaft 7A is lowered, the diameter of the locking link 44 of the locking mechanism 4 is reduced, and the fluid is introduced from the fluid inflow portion 51. is stopped, the fluid pressure acting on the elastic member 5C is reduced, and the diameter of the elastic member 5C is reduced (see also FIG. 14). Next, the shaft member 7 is operated manually or the like to raise the locking mechanism 4 and the sealing mechanism 5 . At this time, the shaft member 7 is raised until the locking mechanism 4 and the sealing mechanism 5 are accommodated in the work case 30 while sequentially releasing the connection of the divided shaft members 7 .

Next, as shown in FIG. 14, in the second removal step, the work case 30 is removed to the side of the shaft member 7 while the flow path of the branch pipe portion 2 is blocked by the repair valve 8, and then the shaft member 7 is removed. are removed in order, and then the locking mechanism 4 and the sealing mechanism 5 are removed. In this second removal process, the work case 30 is removed to the side of the shaft member 7 in the same manner as the first removal process described above, so it is necessary to remove the work case 30 from the upper end of the shaft member 7 along the axis Y direction. The work case 30 can be removed without interfering with the obstacle even in a place where there is an obstacle in the upper part of the work space due to the ceiling wall R or the like. In the second removing step, the branch flow path closing device X may be removed with the locking mechanism 4 and the sealing mechanism 5 housed in the work case 30 without disassembling the work case 30 . Finally, as shown in FIG. 15, in the second installation step, the air valve 9 (new fluid equipment) is installed in the repair valve 8, completing the renewal of the fluid equipment.

[Another embodiment]
As shown in FIG. 17, the work case 30 includes a connecting flange portion 30a connected to the connecting flange portion 3b on the downstream side (upper side) of the gate valve 3, and a shaft member 7 extending from the inner peripheral side of the connecting flange portion 30a. Even if it has a cylindrical main body 30b extending in the direction of the core Y and a disk-shaped bottom wall portion 30d extending inward from the end of the cylindrical main body 30b opposite to the connecting flange portion 30a. good. In this case, the shaft member 7 is sandwiched between the divided portions of the bottom wall portion 30d in a sealed state. Since the connecting flange portion 30a and the tubular main body 30b in this embodiment are the same as those in the above-described embodiment, detailed description thereof will be omitted. In this embodiment, the holding member 15 is fixed to the bottom wall portion 30d, and in the above-described embodiment, the holding member 15 is fixed to the divided plate member 31, which is different. Also in this embodiment, the work case 30 is composed of a first split case 30A and a second split case 30B. In this embodiment, the work case 30 can be made compact because the shaft member 7 is sandwiched between the divided portions of the bottom wall portion 30d in a sealed state. Other functions and effects are the same as those of the embodiment described above.

[Other embodiments]
(1) Although the work case 30 in the above embodiment is divided into two, the work case 30 may be divided into three or more. Further, the shaft member 7 may be provided with a division boundary between the first shaft member and the second shaft member according to the dimension of the gate valve 3 in the axial center Y direction, and the number of divisions is not particularly limited.
(2) The shaft member 7 may have a two-shaft structure in which an inner cylinder shaft 7A for operating the locking mechanism 4 and an outer cylinder shaft 7B for supplying air to the fluid inflow portion 51 are separated.
(3) The locking mechanism 4 is not limited to the above-described form, as long as it can be changed to the expanded diameter posture by operating the inner cylinder shaft 7A.
(4) In the above-described embodiment, the pair of upper annular members 5A are composed of the first disk-shaped member 5Aa and the first water stop fitting 5Ab, and the pair of lower annular members 5B are composed of the second disk-shaped member 5Ba and the second It is composed of a water stop fitting 5Bb. Instead of this, the upper annular member 5A or the lower annular member 5B is constituted by an annular member to which the pinched portions 61 and 62 of the elastic member 5C are fixed, so that the first water stop fitting 5Ab and the second water stop fitting 5Bb You may form any one of these so that a movement is possible. In this case as well, the first water stop fitting 5Ab and the second water stop fitting 5Bb have a divided structure capable of relative movement by screwing together the pull bolt 52 or the pull bolts 53, 55a.

(5) The first clamped portion 61 and the second clamped portion 62 described above are not configured by the elastic member 5C integrated with the inflatable portion 63, but are made of metal or the like. The pinched portion 62 may be connected to the expansion portion 63 as the elastic member 5C.
(6) In the above-described embodiment, air is allowed to flow into the seal mechanism 5, but liquid such as water may be allowed to flow.
(7) Instead of the holding member 15 described above, the sealing mechanism 5 may be provided with a mechanism for holding the inner cylinder shaft 7A and the outer cylinder shaft 7B.
(8) Instead of the release prevention mechanism 10 described above, a separate mechanism for gripping the inner cylinder shaft 7A may be provided.
(9) In the above-described embodiment, the water pipe 1 through which clean water flows is used for explanation, but a fluid pipe through which liquid other than clean water or gas such as gas flows may be used.

INDUSTRIAL APPLICABILITY The present invention can be used for a branch channel closing device for closing a channel of a branch pipe branched from a fluid pipe, and a branch channel closing method using the branch channel closing device.

1: Water pipe (fluid pipe)
2: Branch pipe portion 2a: Connection portion 3: Gate valve 4: Locking mechanism 5: Seal mechanism 5C: Elastic member 7: Shaft member 7A1: First split inner cylinder shaft (first shaft member)
7A2: Second split inner cylinder shaft (first shaft member)
7A3: Third split inner cylinder shaft (second shaft member)
7A4: Fourth split inner cylinder shaft (second shaft member)
7B1: First split outer cylinder shaft (first shaft member)
7B2: Second split outer cylinder shaft (first shaft member)
7B3: Third split outer cylinder shaft (second shaft member)
7B4: Fourth split outer cylinder shaft (second shaft member)
30: work case 30A: first split case 30Aa: first half split member 30Ab: first projecting portion 30Ab2: mating surface 30Ac: first connection flange portion 30B: second split case 30Ba: second half split member 30Bb: second Second projecting portion 30Bb2: mating surface 30Bc: second connecting flange portion 30a: connecting flange portion 30a: flange portion 30b: tubular main body 30c: annular projecting portion 30d: bottom wall portion 31: divided plate member S1: first sealing member (Seal member)
S2: Second sealing member (sealing member)
X: Branching flow channel blocking device Y: Axial center

Claims (5)

A branch channel blocking device for blocking a channel of a branch pipe part branched from a fluid pipe,
a gate valve detachably connected to the branch pipe;
a work case detachably connected to the gate valve;
a locking mechanism locked to a connecting portion between the branch pipe portion and the fluid pipe;
a seal mechanism having an elastic member capable of closing the flow path of the branch pipe;
a shaft member having a first shaft member that supports the locking mechanism and the sealing mechanism; and a second shaft member that is connected to the first shaft member;
The work case is a divided body divided along the axial direction of the shaft member, and the branch flow path blocking device sandwiches the shaft member in a sealed state between the divided parts of the divided body. the working case includes a first split case and a second split case;
The first split case includes a first half-split member, a pair of first projecting portions protruding radially outward from both ends of the first half-split member in the circumferential direction, and a flange of the gate valve. a first connecting flange connected to the
The second split case includes a split second half member, a pair of second projecting portions projecting radially outward from both ends of the second half member in the circumferential direction, and a flange connected to the second split case. and a second connecting flange portion,
A seal member is arranged continuously on mating surfaces of the first projecting portion and the second projecting portion and surfaces of the first connecting flange portion and the second connecting flange portion facing the flange. 2. The branch flow path blockage device according to 1. The work case includes a connecting flange portion connected to the flange of the gate valve, a tubular main body extending in the axial direction from the inner peripheral side of the connecting flange portion, and the connecting flange portion of the tubular main body. a bottom wall extending inwardly from the end opposite the
3. The branching flow channel blocking device according to claim 1, wherein the shaft member is sandwiched between the divided portions of the bottom wall portion in a sealed state. The work case includes a connecting flange portion connected to the flange of the gate valve, a tubular main body extending in the axial direction from the inner peripheral side of the connecting flange portion, and the connecting flange portion of the tubular main body. has an annular projecting portion annularly projecting outward from the end on the opposite side, and a divided plate-shaped member connected to the annular projecting portion,
3. The branching flow channel blocking device according to claim 1, wherein the shaft member is sandwiched between the split portions of the split plate member in a sealed state. A method for removing a branch channel blocking device according to any one of claims 1 to 4,
a closing step of closing the flow path of the branch pipe portion with the sealing mechanism in a state where the locking mechanism is locked to the connecting portion;
a case removal step of removing the work case connected to the gate valve in a direction intersecting with the axial direction after the closing step;
A method for removing a branch flow path blocking device, including a gate valve removing step of removing the second shaft member after the case removing step and then removing the gate valve along the axial direction.

Images