JP7187201B2 - How to install the work valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a work valve for performing a predetermined work within a housing that seals a fluid pipe in an uninterrupted state.

When arranging a fluid control such as a valve or plug in a fluid conduit, it is common practice to cut a portion of the fluid pipe that constitutes the fluid conduit and install the fluid control at the cut location. ing. As a method of installing a fluid control in a fluid pipeline, for example, as shown in Patent Document 1, there is a fluid control installation method using a housing, a work valve, and an inserter attached to the work valve. With the valve open, the insertion machine advances the flow control to install the flow control in the housing in an uninterrupted state.

In this way, the work valve, which is used when performing cutting work, fluid control installation work, etc. in a non-interrupted state in a housing that is hermetically attached to a fluid pipe, is hermetically connected to the opening at the top of the housing. a valve body that communicates with the valve body and protrudes in a substantially horizontal direction; and a valve body that can move between a closed position that closes the housing and an open position that retracts into the valve body. , and the opening/closing state in the housing can be controlled by moving the valve body. A working valve composed of such a valve body, a valve cover and a valve body is suspended by a crane, transported to an installation position, and assembled in a housing to which a fluid pipe is fitted.

Japanese Patent No. 5275845 (page 11, Figure 18)

However, in the case of the work valve disclosed in Patent Document 1, especially when the diameter of the fluid pipe is large, the opening of the housing to which the fluid pipe is fitted is also enlarged, and accordingly, the work valve is damaged. Since the structure is also large, it is necessary to prepare a large crane with high lifting capacity, which not only increases the movable range and installation space of the crane, but also the work valve is located on one side from the opening of the housing. Since it is attached so as to bulge out, there is a problem that it is difficult to keep the weight balance when transported by a crane, resulting in unbalance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting method for a work valve that can be transported by a crane with good weight balance.

In order to solve the above problems, the work valve mounting method of the present invention includes:
A work valve mounting method for mounting a work valve to an opening of a housing for performing a predetermined work in an uninterrupted state in a housing that is hermetically attached to a fluid pipe, the method comprising:
The work valve is attached by assembling a plurality of divided bodies constituting the work valve at the opening of the housing.
According to this feature, not only can the plurality of divided bodies constituting the work valve be separately transported by a crane with good weight balance, but also the load on the crane suspending and supporting the work valve can be reduced to reduce the size of the crane. can.

A valve box having a valve seat as a first divided body constituting the working valve is installed in the opening of the housing, and a valve body is installed in the valve box installed in the opening of the housing as a second divided body. It is characterized by connecting the body and the valve lid.
According to this feature, the valve body and the valve cover are connected after the valve body is first installed in the branch, so that the valve body is not tilted due to the weight balance when the valve body is installed in the branch. Therefore, it is easy to install the valve body at the branch part.

When connecting the valve body and the valve lid to the valve body, the valve body is slid and inserted into the opening of the valve body from the side.
According to this feature, the valve body is guided by the valve body by sliding and inserting the valve body into the opening of the valve body from the side. can.

It is characterized in that the second split bodies are connected so as to face each other on both sides of the valve body.
According to this feature, since the valve body and the valve cover, which are the second divided bodies, are divided, the load on the crane can be reduced, and the weight balance of the work valve can be stabilized. It is possible to suppress an unbalanced load from being applied to the connecting portion with the housing.

It is characterized in that the valve body is configured by installing the divided body of the valve body in the opening of the housing.
According to this feature, the load on the crane can be reduced because the valve body is composed of a plurality of divided bodies.

The position of the center of gravity of the second split body is moved by moving the valve body of the second split body relative to the valve lid.
According to this feature, when the second divided body is suspended by a crane, the center of gravity of the second divided body is aligned with the center of the suspension means, so that the second divided body is not tilted. It can be accurately connected to the valve body while maintaining the horizontal state.

The valve body of the second split body is moved relative to the valve cover by a feed screw mechanism.
According to this feature, not only can the position of the center of gravity of the second divided body be easily moved by using the feed screw mechanism for moving the valve body with respect to the valve cover, but also the feed screw mechanism can provide stepless fine movement. horizontal adjustment is possible.

FIG. 4 is a side cross-sectional view showing how the valve body of the work valve is attached to the housing in the embodiment. FIG. 4 is a side cross-sectional view showing how a valve body and a valve stem are attached to a valve body; FIG. 10 is a side cross-sectional view showing how the mounting flange cylinder is attached to the work valve in the step of installing the cutting machine. FIG. 4 is a side cross-sectional view showing how the cutter and the lid are attached to the mounting flange cylinder in the process of installing the cutting machine. FIG. 10 is a side cross-sectional view showing how the cover is fixed to the mounting flange cylinder in the step of installing the cutting machine. It is an explanatory view showing the structure of a drive mechanism. FIG. 10 is a side cross-sectional view showing how the shaft member and the cutter are connected in the step of installing the cutting machine; FIG. 4 is a side cross-sectional view showing how the jack and the fixing jig are removed in the step of installing the cutting machine. FIG. 10 is a side cross-sectional view showing how the case portion of the drive mechanism and the lid are connected in the step of installing the cutting machine; FIG. 4 is a side cross-sectional view showing how a cutting machine cuts a fluid pipe; FIG. 11 is a side cross-sectional view showing a state in which a segment of a fluid tube is collected; FIG. 4 is a side cross-sectional view showing how the cylindrical member is attached to the working valve in the process of installing the valve introducer. FIG. 4 is a side cross-sectional view showing how the partition wall, the opening/closing shaft and the valve body of the butterfly valve are attached to the cylindrical member in the step of installing the valve introduction device. FIG. 10 is a side cross-sectional view showing a state in which a butterfly valve is configured by attaching an upper lid portion in the process of installing the valve introduction device; FIG. 10 is an explanatory view showing how the mounting flange cylinder is attached to the cylindrical member in the process of installing the valve introduction device. FIG. 10 is a side cross-sectional view showing how the valve hanger and the lid are attached in the process of installing the valve introduction machine. FIG. 10 is a side cross-sectional view showing how the cover is fixed to the mounting flange cylinder in the process of installing the valve introducer. FIG. 10 is a side cross-sectional view showing how the shaft member and the valve hanging fitting are connected in the process of installing the valve introduction machine. FIG. 4 is a side cross-sectional view showing how the jack and the fixing jig are removed in the process of installing the valve introduction machine. FIG. 4 is a side cross-sectional view showing how the butterfly valve and the valve suspension fitting are connected in the process of installing the valve introduction machine. FIG. 4 is a side cross-sectional view showing how a butterfly valve is installed at a cut portion of a fluid pipe by a valve introduction machine; FIG. 4 is a side cross-sectional view showing a state in which the valve suspension fitting is pulled up into the cylindrical member and the mounting flange cylinder; FIG. 5 is a side cross-sectional view showing a work valve in Modification 1; FIG. 11 is a side cross-sectional view showing a working valve in Modification 2; FIG. 11 is a side cross-sectional view showing a cutting machine in modification 3; (a) is a side cross-sectional view showing a cutting machine in modification 4, (b) is an A arrow view, and (c) is a BB cross-sectional view. (a) is a side cross-sectional view showing a state in which the valve body and the valve stem are inclined and suspended, and (b) is a side cross-sectional view showing a state in which the same is horizontally adjusted. FIG. 11 is a side cross-sectional view showing a modified example of how a butterfly valve is configured by attaching an upper lid portion in the process of installing the valve introduction device.

A mode for carrying out the method for mounting a work valve according to the present invention will be described below based on an embodiment.

In the embodiment, a series of steps from cutting a predetermined portion of the existing fluid pipe 1 that constitutes the flow path forming member to installing a butterfly valve 10 (fluid control) at the cut portion is shown in FIGS. 1 to 28. will be described with reference to

As shown in FIG. 1, a predetermined portion of a fluid pipe 1 buried in the ground is excavated to seally surround a two-part housing 2 having a branch portion 2a opening upward. The fluid in the fluid tube 1 may be, for example, tap water, industrial water, sewage, gas, or a gas-liquid mixture of gas and liquid. Furthermore, although the housing 2 has a two-part structure in this embodiment, it may have another plural-part structure, and the joints of the two parts may be welded or bolted via packing. .

The fluid pipe 1 is a steel pipe and has a substantially circular cross-sectional shape. The fluid pipe according to the present invention may be made of ductile cast iron, other cast iron, other metals, concrete, vinyl chloride, polyethylene, polyolefin, or the like. Furthermore, the inner peripheral surface of the fluid pipe may be coated with an epoxy resin layer, mortar, plating, or the like, or the inner peripheral surface of the fluid pipe may be coated with an appropriate material by powder coating.

Further, when the housing 2 is attached to the fluid pipe 1 in a sealed manner, concrete foundations 9, 9 are formed below the housing 2 to support the weight of the surroundings of the housing 2 and prevent the fluid pipe 1 from bending or the like. To prevent. The concrete foundations 9 are not limited to the concrete foundations 9, and jacks or the like may be used as long as they can support the weight of the housing 2, the cutting machine 5, and the valve introducing machine 6, which will be described later.

Next, the process of attaching the working valve 4 capable of closing the opening of the branch portion 2a (opening) of the housing 2 will be described. First, as shown in FIG. 1, a valve box 41 (first divided body) constituting the working valve 4 is suspended from above by a hook C and a wire W, which are suspended by a crane (not shown). Then, it is placed on the flange 2b of the branch portion 2a, and the flange 2b and the valve body 41 are fixed with bolts and nuts (not shown) while adjusting the position of the valve body 41 on the flange 2b. The crane used in this embodiment is preferably a mobile rough terrain crane. Possible specifications are selected considering the allowable lifting load at the turning radius. In many cases, the installation area of the crane is required to be larger than the excavation area of the fluid pipe 1, including the outriggers and the like.

In this embodiment, even after the valve body 41 is placed on the flange 2b of the branching portion 2a, the wire W is slightly loosened to the valve body 41 and connected to the crane for ensuring safety. , but not limited to this, the sling C and the wire W may be removed from the valve box 41 . Further, in order to facilitate the position adjustment of the valve body 41, the position of the valve body 41 may be adjusted with respect to the flange 2b while the valve body 41 is slightly suspended by a crane.

The valve box 41 has a substantially tubular shape penetrating vertically, and has a slide groove 41b extending substantially horizontally from an opening 41a provided on one side. A valve seat portion 41c is formed on (the side opposite to the opening portion 41a). The weight of the valve body 41 in this embodiment is approximately 4500 kg. Since an O-ring (not shown) is pressed between the flange 2b and the valve box 41, the branch portion 2a and the valve box 41 are connected in a sealed manner. Henceforth, the weight of each member is only an example, and can be changed to an appropriate weight.

Next, as shown in FIG. 2, in a state in which the valve body 42, the valve cover 43 and the valve stem 44 (second divided body) constituting the working valve 4 are unitized, the hanger C and the valve cover 43 are assembled. The valve body 41 is lowered to the side of the opening 41a of the valve body 41 by suspending it by means of a wire W inserted through a shackle or the like in the holes 43b, 43b provided in the upper part. Then, in this suspended state, the valve lid 43 is fixed to the side of the valve box 41 with bolts, nuts, etc. (not shown) (see FIG. 3). More specifically, the valve body 42 is attached to the valve lid 43 by a feed screw mechanism so as to move back and forth between a position where it is accommodated within the valve lid 43 by a valve stem 44 and a position where it protrudes from the valve lid 43 . At the retracted position, a portion of the valve body 42 (the end on the side opposite to the valve stem 44 (valve case 41 side)) protrudes from the opening 43 a of the valve cover 43 . The feed screw mechanism described above is screwed to the male threaded portion of the valve stem 44 which is rotatable about the axis and pivoted so as not to advance or retreat in the axial direction, and to the male threaded portion formed at the lower portion of the valve body 42. It consists of a female threaded portion.

As described above, the working valve 4 shown in FIG. 2 is suspended by the hanger C and the wire W in a state in which the valve body 42, the valve lid 43 and the valve stem 44 (second split body) are unitized. The second split body has an opening 43a at one end (left end in the drawing) of the valve cover 43 that is opened and the other end (right end in the drawing) of the valve cover 43 that is closed. Since the operating portion of the valve stem 44 extends (to the right in the drawing), the center of gravity of the second divided body is slightly biased toward the other end (to the right) of the horizontal center in the drawing. Therefore, in this suspended state, as shown in FIG. 27(a), the center of gravity of the valve body 42, the valve cover 43, and the valve stem 44, which constitute the second split body, is biased toward the valve stem 44 side. , it may become tilted. In that case, as shown in FIG. 27(b), by operating the valve stem 44 to move the valve element 42 toward the opening 43a with respect to the valve lid 43, the center of gravity of the second split body is shifted. can be adjusted. In this way, when the second divided body is suspended by a crane, the center of gravity of the second divided body is aligned with the center of the hoisting tool C, so that the second divided body can be placed in a horizontal state without being tilted. can be accurately connected to the valve body while holding the

Further, this adjustment is performed by operating the valve stem 44 in a state in which the second divided body is temporarily suspended, or in a state in which the second divided body is once placed after confirming the tilted state, and the second divided body is maintained in a state of levelness. 2, the valve cover 43 and the valve body 42 can be slid to abut and connect to the valve box 41 smoothly. In this way, by using the feed screw mechanism for moving the valve body 42 with respect to the valve cover 43, not only can the position of the center of gravity of the second divided body be easily moved, but also the feed screw mechanism can provide a stepless and delicate movement. horizontal adjustment is possible. In addition, since the horizontal adjustment is performed by the screw mechanism of the valve stem 44 and the valve body 42, there is no unintended horizontal movement even if the valve body 42 is tilted. There is no need to prepare jigs.

When fixing the valve cover 43 to the side of the valve box 41 , the projecting portion of the valve body 42 protruding from the opening 43 a of the valve cover 43 is inserted into the opening 41 a of the valve box 41 and brought into contact with the valve box 41 . The valve cover 43 is slid horizontally until they come into contact with each other, and the valve cover 43 and the valve box 41 are fixed with bolts and nuts (not shown). The weight of the valve body 42, the valve cover 43 and the valve stem 44 in this embodiment is approximately 6000 kg in a unitized state.

In addition, since the packing S1 is pressed against the valve cover 43 and the valve box 41 in the circumferential direction, the seal between the valve cover 43 and the valve box 41 can be ensured (enlarged portion in FIG. 3). reference). In this embodiment, the packing S1 is press-fitted into the groove provided on the valve lid 43 side. A packing S1 may be press-fitted.

In this embodiment, the unitized valve body 42, valve cover 43, and valve stem 44 are attached to the valve body 41 in a state of being suspended by the hanger C and the wire W. However, the present invention is not limited to this. For example, a mounting table may be arranged near the valve body 41, and the valve body 42, the valve lid 43 and the valve stem 44 may be mounted on the mounting table and attached to the valve body 41. FIG.

Thus, the working valve 4 has a first divided body (approximately 4500 kg) composed of the valve body 41 and a second divided body (approximately 6000 kg) composed of the valve body 42, the valve lid 43 and the valve stem 44. ), and the working valve 4 is constructed by assembling these in order with respect to the branch portion 2a of the housing 2. As shown in FIG. That is, since the first divided body and the second divided body can be separately transported by the sling C and the wire W, the first divided body and the second divided body can be transported with good weight balance. Compared to the case where the work valve 4 is installed in the branch part 2a in an assembled state (the work valve 4 having a total weight of 10,500 kg), the load on the crane can be distributed and reduced, so that the crane can be made smaller. , the work space for installing the work valve 4 can be saved. Moreover, since the load on the hoisting tool C and the wire W is reduced, there is no need to prepare a thick hoisting tool C and the wire W, and the cost of the hoisting tool C and the wire W to be used can be suppressed.

Further, as will be described later, when a hole saw such as the cutter 52 of this embodiment is used as a means for cutting the fluid pipe 1, the diameter of the hole saw is larger than the outer diameter of the fluid pipe 1. Although the structure of the valve 4 is also large, even in such a case, the first divided body and the second divided body can be separately transported by the hoist C and the wire W, so that the crane can be suitably miniaturized.

Here, from the viewpoint of workability, the valve body 42, the valve cover 43, and the valve stem 44 are fixed to the valve body 41 in a unitized state. The valve cover 43 and the valve stem 44 may be separately attached to the valve box 41 in this order to further distribute and reduce the load on the crane.

The working valve 4 is constructed by dividing a valve body 41 installed above the branch portion 2a, a valve body 42, a valve lid 43, and a valve stem 44, which bulge laterally from the valve body 41. After the valve body 41 is fixed to the branch portion 2a, the valve body 42, the valve lid 43 and the valve stem 44 are fixed to the valve body 41. Therefore, when installing the valve body 41 to the branch portion 2a, the weight balance Installation of the valve box 41 on the branch portion 2a is facilitated without tilting of the suspended load. Similarly, when connecting the valve body 42, the valve lid 43 and the valve stem 44 to the valve body 41, the suspended load does not tilt due to the weight balance. connection becomes easier. In addition, since it is not necessary to suspend the work valve 4 at a plurality of locations in order to maintain the weight balance of the work valve 4, the work space required for installing the work valve 4 can be suitably saved.

When connecting the valve body 42 , the valve lid 43 and the valve stem 44 to the valve body 41 , the valve body 42 is inserted into the opening 41 a of the valve body 41 and the valve lid 43 is pushed sideways until it contacts the valve body 41 . Since the valve body 42 is guided by the valve body 41 by sliding from the valve body 41 , the valve body 42 , the valve lid 43 and the valve stem 44 can be accurately arranged with respect to the valve body 41 .

In this embodiment, the valve cover 43 and the valve box 41 are fixed by bolts and nuts, but the present invention is not limited to this, and they may be fixed by other fixing means such as a vise. , may be fixed by welding or the like.

Next, the process of installing the cutting machine 5 for cutting the fluid pipe 1 above the working valve 4 will be described. As shown in FIG. 3 , first, a mounting flange tube 51 (cylindrical body) penetrating in the vertical direction is suspended by a hanging tool C and a wire W and lowered to above the valve box 41 . , the mounting flange cylinder 51 is fixed with a bolt nut or the like (not shown). The weight of the mounting flange cylinder 51 in this embodiment is approximately 2600 kg. An O-ring (not shown) is pressed between the mounting flange cylinder 51 and the valve box 41, so that the valve box 41 and the mounting flange cylinder 51 are connected in a sealed manner.

In this embodiment, even after the mounting flange cylinder 51 is placed on the valve box 41, the wire W is slightly loosened to the mounting flange cylinder 51 and connected to a crane (not shown) for ensuring safety. However, it is not limited to this, and the sling C and the wire W may be removed from the mounting flange cylinder 51 . In addition, in order to facilitate the position adjustment of the mounting flange tube 51, the position of the mounting flange tube 51 may be adjusted with respect to the valve body 41 while the mounting flange tube 51 is slightly suspended by a crane.

Next, as shown in FIG. 4, the cutter 52 is temporarily installed on the mounting flange cylinder 51 . Specifically, with the lid 53 of the mounting flange cylinder 51 connected above the cutter 52 , it is suspended by the hanger C and the wire W and lowered to above the mounting flange cylinder 51 . The cutter 52 is composed of a cylindrical member 52a having a cutting edge on its peripheral end and a center drill 52b coaxially disposed on the cylindrical member 52a and projecting forward beyond the boring blade. and is fixed. Above the cylindrical member 52a and the center drill 52b, an adapter 54 having an annular protrusion 54a formed at its upper end is mounted so as not to rotate relative to each other.

A through hole 53a is formed in the center of the lid body 53 so as to extend vertically therethrough, and the adapter 54 is inserted through the through hole 53a. Further, the lid body 53 has a plurality of recesses 53b formed in the circumferential direction, which are recessed in the outer diameter direction from the inner peripheral surface of the through hole 53a. A fixing jig 55 is provided. The fixing jig 55 protrudes in the radial direction of the through-hole 53a and engages with the lower surface of the annular protrusion 54a of the adapter 54, thereby integrating the cutter 52 and the lid 53 together.

In this embodiment, the weight of the cutter 52 is approximately 2910 kg, the weight of the lid body 53 is approximately 1900 kg, the weight of the adapter 54 is approximately 290 kg, and the total weight of these is approximately It is 5100 kg.

As shown in FIG. 5, the mounting flange cylinder 51 and the lid body 53 are aligned with the lid body 53 placed above the mounting flange cylinder 51, and fixed with bolts and nuts (not shown). At this time, the cutter 52 is housed inside the mounting flange cylinder 51 .

Moreover, as shown in the enlarged portion of FIG. It can ensure the airtightness between In this embodiment, the packing S2 is press-fitted into the recessed groove provided on the lid body 53 side. A packing S2 may be press-fitted into the .

In this embodiment, even after the cover 53 is placed on the mounting flange cylinder 51, the wire W is slightly loosened to the cover 53 and connected to the crane for ensuring safety. Alternatively, the hanger C and the wire W may be removed from the lid 53 . In addition, in order to facilitate the position adjustment of the mounting flange tube 51, the position of the mounting flange tube 51 may be adjusted with respect to the valve body 41 while the mounting flange tube 51 is slightly suspended by a crane.

Next, the drive mechanism 8 (drive section) of the cutting machine 5 is connected to the cutter 52 . First, the structure of the driving mechanism 8 will be described with reference to FIG.

As shown in FIG. 6, the drive mechanism 8 includes a shaft member 81, a gripping member 82 capable of gripping or releasing the gripping of the shaft member 81, and moving the gripping member 82 back and forth within the axial range of the shaft member 81. Mainly composed of an advancing/retreating member 83, a regulating member 84 capable of restricting or releasing the movement of the shaft member 81 at a position below the advancing/retreating member 83, and a base member 85 to which the advancing/retreating member 83 and the regulating member 84 are attached. ing. The weight of the drive mechanism 8 in this embodiment is approximately 6060 kg.

The base member 85 is provided with a plurality of pillars 85a that stand upright, and the advancing/retreating member 83 is attached so as to be vertically slidable along the pillars 85a. That is, the shaft member 81 can be vertically slid by gripping the shaft member 81 with the gripping member 82 and moving the advancing/retracting member 83 along the support 85a.

A cylindrical case portion 86 through which the shaft member 81 can be inserted is provided below the base member 85 . The inner peripheral surface of the case portion 86 is provided with a packing S3 that seals the outer peripheral surface of the shaft member 81, and the lower surface of the case portion 86 is formed with an annular groove 86a. An annular packing S4 is press-fitted into the annular groove 86a.

In addition, a rotating motor 87 is fixed to a part of the advancing/retreating member 83 , and the rotating motor 87 applies a rotational force to the gripping member 82 that grips the shaft member 81 , thereby moving the shaft member 81 . Rotation can be transmitted, and the cutter 52 can be rotated by rotating the shaft member 81 . By preparing a plurality of shaft members 81, the length in the axial direction can be lengthened by adding them in the axial direction. Such an adding structure can reduce weight and height. .

As shown in FIG. 7, when the drive mechanism 8 is connected to the cutter 52, a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the upper flange 53c of the lid 53, and the shaft member 81 is preliminarily moved. The drive mechanism 8 is suspended by the hanger C and the wire W, and the case portion 86 is placed on the jack 7. do. Next, an operator accesses through the gap between the case portion 86 formed by the jack 7 and the upper flange 53c of the lid 53, and connects the shaft member 81 and the adapter 54 with the bolt and nut N1.

In this embodiment, even after the drive mechanism 8 is placed on the jack 7, the wire W is connected to the crane with the wire W slightly loosened to ensure safety. However, the sling C and the wire W may be removed from the drive mechanism 8 . Further, in order to facilitate the position adjustment of the drive mechanism 8, the position adjustment of the shaft member 81 and the adapter 54 may be performed while the drive mechanism 8 is slightly suspended by a crane.

Next, as shown in FIG. 8, the driving mechanism 8, the adapter 54, and the cutter 52 are lifted slightly upward by a crane, the jack 7 is removed from between the case portion 86 and the lid body 53, and the fixing jig 55 is removed. It is retracted into the recess 53b. At this time, since the cutter 52 (approximately 2910 kg), the adapter 54 (approximately 290 kg), and the drive mechanism 8 (approximately 6060 kg) are lifted by the crane, the weight applied to the crane is approximately 9260 kg. At this time, a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the lower flange 53d of the lid body 53, and the drive mechanism 8 is placed on the jacks 7 so as to receive the weight and hang on the crane. Weight may be reduced.

Subsequently, as shown in FIG. 9, the driving mechanism 8 is lowered by a crane so that the case portion 86 is placed on the upper flange 53c of the lid 53, and the case portion 86 and the lid 53 are connected by bolts and nuts (not shown). and fixed. Thus, the mounting flange cylinder 51, the cutter 52, the lid 53, the adapter 54, and the driving mechanism 8 constitute the cutting machine 5, and the casing 2, the working valve 4, and the cutting machine 5 constitute the cutting device. At this time, it goes without saying that the center drill 52b is adjusted so as not to come into contact with the valve body .

Further, when the case portion 86 and the lid body 53 are fixed, the packing S4 is pressed between the case portion 86 and the upper flange 53c of the lid body 53, so that the case portion 86 and the lid body 53 are tightly sealed. can ensure the integrity. In this embodiment, the packing S4 is press-fitted into the annular groove 86a formed in the lower surface of the case portion 86. However, the invention is not limited to this. A packing S4 may be press-fitted into the annular groove.

In this embodiment, even after the case portion 86 is placed on the lid 53, the wire W is connected to the crane while the wire W is slightly loosened in order to ensure safety. , the sling C and the wire W may be removed from the drive mechanism 8. Further, in order to facilitate the position adjustment of the drive mechanism 8, the position adjustment between the case portion 86 and the lid body 53 may be performed while the drive mechanism 8 is slightly suspended by a crane.

Next, the process of cutting the fluid pipe 1 by the cutting machine 5 will be described. As shown in FIG. 10, first, the valve body 42 of the working valve 4 is retracted to open the branch portion 2a, and the outer peripheral surface of the shaft member 81 on the rear end side is gripped by the gripping member 82 described above. Next, the rotary motor 87 is driven to rotate the shaft member 81 and the cutter 52 . Then, the advance/retreat member 83 is advanced toward the fluid pipe 1 while the shaft member 81 and the cutter 52 are rotated. According to this, the center drill 52b of the cutter 52 first pierces the wall of the fluid pipe 1. As shown in FIG.

The axial member 81 and the cutter 52 are advanced in a range from the position where the gripping member 82 grips the shaft member 81 to the position close to the regulating member 84, and the shaft member 81 slides on the packing S3 to advance. The movement of the shaft member 81 and the cutter 52 after completing the advance movement is restricted by the restriction member 84 . After that, the rotation of the shaft member 81 by the rotary motor 87 is stopped, another shaft member 81 ′ is connected to the upper end of the shaft member 81 , and by repeating the above steps, the cylindrical member 52 a of the cutter 52 cuts the fluid pipe 1 . . At this time, another shaft member 81' is not necessarily connected, and the cutting may be completed by using the shaft member 81 having a predetermined length in advance.

As shown in FIG. 11, when the fluid tube 1 is cut by the cutter 52, a piece 1a formed by cutting the fluid tube 1 is held in the cylindrical member 52a. Then, by moving the shaft member 81 and the cutter 52 backward in a procedure opposite to the above steps, the branch portion 2a is closed by the valve body 42 of the working valve 4, thereby pulling up the section 1a into the mounting flange cylinder 51. , the cutting operation of the fluid pipe 1 is completed.

Although not shown in particular, the drive mechanism 8 is first removed from the lid 53 while the branch 2a is closed by the valve body 42 of the working valve 4, and the lid 53 and the cutter 52 are attached together with the piece 1a to the mounting flange. By removing it from the cylinder 51 and removing the mounting flange cylinder 51 from the working valve 4, the removal work of the cutting machine 5 is completed. In this manner, since each member constituting the cutting machine 5 can be separately transported by a crane, the load on the crane during removal work of the cutting machine 5 can be reduced.

Next, the process of installing the valve introducer 6 for installing the butterfly valve 10 at the location where the fluid pipe 1 is cut will be described. As shown in FIG. 12, first, a cylindrical member 61 (cylindrical body) penetrating in the vertical direction is hung by a hanger C and a wire W while the branch portion 2a is closed by the valve body 42 of the working valve 4. The cylindrical member 61 is fixed above the working valve 4 with a bolt nut or the like (not shown). The weight of the cylindrical member 61 in this embodiment is approximately 3000 kg. An O-ring (not shown) is pressed between the cylindrical member 61 and the working valve 4 (valve box 41), so that the cylindrical member 61 and the working valve 4 are connected in a sealed manner.

In this embodiment, even after the cylindrical member 61 is placed on the working valve 4, the wire W is slightly loosened to the cylindrical member 61 and connected to the crane in order to ensure safety. However, the sling C and the wire W may be removed from the cylindrical member 61 . Further, in order to facilitate the position adjustment of the cylindrical member 61, the position adjustment of the valve body 41 and the cylindrical member 61 may be performed while the cylindrical member 61 is slightly suspended by a crane.

Next, a process of temporarily installing the butterfly valve 10 on the cylindrical member 61 will be described. First, the structure of the butterfly valve 10 will be explained with reference to FIG.

As shown in FIG. 14, the butterfly valve 10 controls the passage of the fluid pipe 1 between a state in which the fluid can pass and a state in which the fluid cannot pass. An opening/closing shaft 12 rotatably attached to the upper end of the wall 11; and a substantially circular upper lid portion 14 (lid body portion) extending in a substantially horizontal direction, which is sealingly connected to the . A packing S5 is fixed to the partition wall 11 over both side surfaces and a bottom surface thereof, and a packing S6 is fixed to the upper lid portion 14 over the entire outer peripheral surface thereof, and the packings S5 and S6 are continuous. connected as follows. Incidentally, the total weight of the butterfly valve 10 in this embodiment is approximately 9540 kg. Furthermore, it goes without saying that the space between the partition wall 11 and the upper lid portion 14 is sealed with packing or the like.

As shown in FIG. 13, when temporarily installing the butterfly valve 10 on the cylindrical member 61, first, the partition wall 11, the opening/closing shaft 12, and the valve body 13 (main body) are integrated, and the hanger C and the It is lowered to a position where it is suspended by the wire W and accommodated in the cylindrical member 61 . At this time, the valve body 13 is arranged so as to be substantially parallel to the pipe axis direction (the opening of the partition wall 11 is opened).

Then, a locking member 62 (locking portion, holding portion) is inserted so as to partly protrude into the cylindrical member 61 from the outside through a plurality of windows 61 a formed in the circumferential direction of the cylindrical member 61 . As a result, the projecting piece 11a projecting outward from the partition wall 11 is placed (locked) on the tip of the locking member 62, and the partition wall 11, the opening/closing shaft 12 and the valve body 13 are connected to the cylindrical member 61. will be retained at In addition, since a concave portion 62a capable of accommodating a part of the valve body 13 is formed in the lower portion of the tip side of the locking member 62, the locking member 62 and the valve body 13 do not interfere with each other.

Next, as shown in FIG. 14, the upper lid portion 14 is suspended by the hanger C and the wire W, and placed on the upper portion of the partition wall 11 with the open/close shaft 12 inserted therethrough. The butterfly valve 10 is constructed by sealingly connecting the upper lid portion 14 and the partition wall 11 by fixing means (not shown).

In this embodiment, even after the top cover 14 is placed on the partition wall 11, the wires W are slightly loosened to the top cover 14 and connected to the crane for ensuring safety. However, the hanger C and the wire W may be removed from the upper lid portion 14 . Further, in order to facilitate position adjustment of the upper lid portion 14, the positions of the upper lid portion 14, the partition wall 11, the opening/closing shaft 12, and the valve body 13 may be adjusted while the upper lid portion 14 is slightly hung by a crane. good.

Furthermore, in this embodiment, the butterfly valve 10 is configured on the cylindrical member 61 by fixing the upper lid portion 14 to the partition wall 11, the opening/closing shaft 12 and the valve body 13 that are integrated. The butterfly valve 10 may be configured by separately installing the partition wall 11, the opening/closing shaft 12, the valve body 13, and the upper cover portion 14 in order. Alternatively, the partition wall 11 and the valve body 13 may be integrated, the opening/closing shaft 12 and the upper lid portion 14 may be integrated, and the butterfly valve 10 may be configured by assembling them. In other words, any form can be freely changed as long as at least the upper lid portion 14 is separated from other members (body portion) and the butterfly valve 10 is configured by assembling them.

Here, a modification for temporarily installing the butterfly valve 10 on the cylindrical member 61 will be described. Note that descriptions of the same configurations and procedures as in this embodiment will be omitted.

FIG. 28 shows another mode in which the upper lid portion 14 is suspended by the hanger C and the wire W at the opening of the housing 2 and assembled to the partition wall 11, as described above with reference to FIG. As shown in FIG. 14, when the upper lid portion 14 is connected to the partition wall 11 from above, the upper lid portion 14 enters the inside of the cylindrical member 61, making it difficult to connect both members. , it may be difficult to check the connection point.

In such a case, for example, by arranging a spacer (not shown) on the protruding piece 11a with which the partition wall 11 and the locking member 62 abut, the upper end of the partition wall 11 protrudes upward from the upper surface 61b of the cylindrical member 61. can be arranged to be supported by In addition, of course, it is designed so that the upper end of the partition wall 11 can be originally supported at a position protruding upward from the upper surface 61b of the cylindrical member 61 without arranging the spacer on the protruding piece 11a. It's okay to be.

As a result, when the upper lid portion 14 is hung by the hanger C and the wire W and connected from the upper portion of the partition wall 11, there is a gap between the lower surface 14a of the upper lid portion 14 and the upper surface 61b of the cylindrical member 61 in the vertical direction. A gap Z of is generated. This gap Z allows visual confirmation of the connecting portion between the partition wall 11 and the upper lid portion 14 from the horizontal direction.

Next, as shown in FIG. 15, the mounting flange cylinder 63 penetrating in the vertical direction is suspended by the hanger C and the wire W and lowered to above the cylindrical member 61, and the mounting flange cylinder 63 is lowered above the cylindrical member 61. 63 is fixed by a bolt nut or the like (not shown). The weight of the mounting flange cylinder 63 in this embodiment is approximately 2600 kg.

In this embodiment, even after the mounting flange tube 63 is placed on the cylindrical member 61, the wire W is slightly loosened to the mounting flange tube 63 and connected to the crane in order to ensure safety. , but not limited to this, the sling C and the wire W may be removed from the mounting flange cylinder 63 . Further, in order to facilitate position adjustment of the mounting flange tube 63, the mounting flange tube 63 and the cylindrical member 61 may be adjusted in position while the mounting flange tube 63 is slightly suspended by a crane.

Further, as shown in the enlarged view of FIG. 15, an annular groove 63a is formed in the lower surface of the mounting flange cylinder 63, and an annular packing S7 is press-fitted into the annular groove 63a. When the cylindrical member 61 and the mounting flange cylinder 63 are fixed, the packing S7 is pressed between the cylindrical member 61 and the mounting flange cylinder 63, so that the sealing between the cylindrical member 61 and the mounting flange cylinder 63 is ensured. can. In this embodiment, the packing S7 is press-fitted into the annular groove 63a formed in the lower surface of the mounting flange cylinder 63. However, the invention is not limited to this. A packing S7 may be press-fitted into the annular groove.

Next, as shown in FIG. 16 , a valve suspension fitting 64 to be connected to the butterfly valve 10 is temporarily installed on the mounting flange cylinder 63 . Specifically, the lid 65 of the mounting flange cylinder 63 is connected above the valve hanger 64 , suspended by the lifting tool C and the wire W, and lowered to above the mounting flange cylinder 63 . The valve suspension metal fitting 64 includes a mounting surface portion 64a facing in a substantially horizontal direction, a cylindrical shaft portion 64c extending upward from a through hole 64b provided substantially at the center of the mounting surface portion 64a, and a shaft portion 64c between the mounting surface portion 64a and the shaft portion 64c. and reinforcing ribs 64d provided over the entire length. An adapter 66 is connected to the upper end of the shaft portion 64c.

A through hole 65a is formed in the center of the lid body 65 so as to extend therethrough in the vertical direction, and an adapter 66 is inserted through the through hole 65a. Further, the lid body 65 is provided with a plurality of recesses 65b that are recessed in the outer diameter direction from the inner peripheral surface of the through hole 65a in the circumferential direction. A fixing jig 67 is provided. The fixing jig 67 protrudes in the inner diameter direction of the through-hole 65a and engages with the lower surface of the annular projection 66a of the adapter 66, thereby integrating the valve suspension fitting 64 and the lid body 65. As shown in FIG.

In this embodiment, the weight of the valve hanging fitting 64 is approximately 2000 kg, the weight of the lid body 65 is approximately 1900 kg, and the weight of the adapter 66 is approximately 270 kg. is approximately 4170 kg.

As shown in FIG. 17, the mounting flange cylinder 63 and the lid body 65 are aligned with the lid body 65 placed on the upper end of the mounting flange cylinder 63, and fixed with bolts and nuts (not shown). In this embodiment, even after the lid 65 is placed on the mounting flange cylinder 63, the wire W is slightly loosened to the lid 65 and connected to the crane in order to ensure safety. Alternatively, the sling C and the wire W may be removed from the lid 65 . Further, in order to facilitate the position adjustment of the lid 65, the positions of the mounting flange cylinder 63 and the lid 65 may be adjusted while the lid 65 is slightly suspended by a crane.

As shown in the enlarged portion of FIG. 17, the packing S8 is pressed against the mounting flange cylinder 63 and the lid body 65 in the circumferential direction. Sealability can be secured. In this embodiment, the packing S8 is press-fitted into the recessed groove provided on the lid body 65 side. A packing S8 may be press-fitted in.

Next, the drive mechanism 8 as an insertion device for the valve introduction device 6 is connected to the valve suspension fitting 64 . Since the drive mechanism 8 is the same as that used in cutting the fluid pipe 1, the description of the structure of the drive mechanism 8 is omitted.

As shown in FIG. 18, when the drive mechanism 8 is connected to the valve suspension fitting 64, the shaft member 81 is advanced downward by a predetermined length in advance so that the lower end of the shaft member 81 is positioned below the case portion 86. A plurality of jacks 7 (spacers) are arranged in the circumferential direction of the upper flange 65 c of the lid 65 , the drive mechanism 8 is suspended by a crane, and the case portion 86 is placed on the jacks 7 . Next, an operator accesses through the gap between the case portion 86 formed by the jack 7 and the upper flange 65c of the lid 65, and connects the shaft member 81 and the adapter 66 with the bolt and nut N2.

Next, as shown in FIG. 19, the drive mechanism 8, the adapter 66, and the valve lifting fitting 64 are lifted slightly upward by a crane, the jack 7 is removed from between the case portion 86 and the lid body 65, and the fixing jig is removed. 55 is retracted into the recess 53b. At this time, since the valve suspension fitting 64 (approximately 2000 kg), the adapter 66 (approximately 270 kg), and the drive mechanism 8 (approximately 6060 kg) are suspended by the suspension tool C and the wire W, the weight applied to the suspension tool C and the wire W is approximately 8330 kg. It has become. At this time, a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the lower flange 65d of the lid body 65, and the drive mechanism 8 is placed on the jacks 7 so as to receive the weight and hang on the crane. Weight may be reduced.

Next, although not shown in particular, the driving mechanism 8 is suspended by the hanger C and the wire W so that the case portion 86 is placed on the upper flange 65c of the lid 65, and the case portion 86 and the lid are mounted by bolts and nuts (not shown). 65 are fixed. Further, when the case portion 86 and the lid body 65 are fixed, the packing S4 is pressed between the case portion 86 and the upper flange 65c of the lid body 65, so that the case portion 86 and the lid body 65 are tightly sealed. can ensure the integrity. In this embodiment, the packing S4 is arranged on the lower surface of the case portion 86, but the present invention is not limited to this. A packing S4 may be press-fitted.

In this embodiment, even after the case portion 86 is placed on the lid 65, the wire W is connected to the crane while the wire W is slightly loosened in order to ensure safety. , the sling C and the wire W may be removed from the drive mechanism 8. Further, in order to facilitate the position adjustment of the drive mechanism 8, the position adjustment of the case portion 86 and the lid body 65 may be performed while the drive mechanism 8 is slightly suspended by a crane.

Next, as shown in FIG. 20, the valve suspension fitting 64 is lowered by the drive mechanism 8, and the mounting surface portion 64a of the valve suspension fitting 64 and the upper lid portion 14 of the butterfly valve 10 are connected by bolts and nuts (not shown). As a result, the cylindrical member 61, the mounting flange tube 63, the valve suspension fitting 64, the lid 65, the adapter 66, and the drive mechanism 8 constitute the valve introduction device 6, and the housing 2, the work valve 4, and the valve introduction device 6 constitute the valve introduction device 6. An installation device is configured. At this time, the opening/closing shaft 12 of the butterfly valve 10 is inserted into the shaft portion 64c of the valve hanger 64. As shown in FIG.

After that, the valve hanging fitting 64 and the butterfly valve 10 are slightly lifted upward by the driving mechanism 8, and the locking member 62 is retracted and pulled out from the window portion 61a of the cylindrical member 61. As shown in FIG. Although not shown, the window portion 61a is plugged so as to close it in a sealed manner. At this time, it goes without saying that the lower end of the butterfly valve 10 is adjusted so as not to come into contact with the valve body 42 .

Next, the process of installing the butterfly valve 10 at the cut portion of the fluid pipe 1 by the valve introducer 6 will be described. As shown in FIG. 21, the valve body 42 of the working valve 4 is retracted to open the branch portion 2a, and the outer peripheral surface of the shaft member 81 on the rear end side is gripped by the gripping member 82 described above. Then, the shaft member 81 and the butterfly valve 10 are advanced toward the fluid pipe 1 by sliding the advancing/retracting member 83 toward the fluid pipe 1 .

The advancing movement of the shaft member 81 and the butterfly valve 10 is performed in a range from the position where the gripping member 82 grips the shaft member 81 to the position close to the regulating member 84, and the shaft member 81 and the butterfly valve 10 after completing the advancing movement are , movement is restricted by the restriction member 84 . After that, another shaft member 81 ′, 81 ′ is connected to the upper end of the shaft member 81 , and the butterfly valve 10 is arranged at the cut portion of the fluid pipe 1 by repeating the above steps. After disposing the butterfly valve 10 at the cut portion of the fluid pipe 1, the butterfly valve 10 is fixed to the housing 2 by a predetermined fixing means. At this time, another shaft member 81' is not necessarily connected, and the arrangement may be completed using the shaft member 81 having a predetermined length in advance.

In addition, when the butterfly valve 10 is fixed to the housing 2, the packing S5 of the partition wall 11 is pressed across both inner side surfaces and the inner bottom surface of the housing 2, and the packing S6 of the upper lid portion 14 is pressed. Since the inner peripheral surface of the branch portion 2a is pressed against each other, the fluid flowing through the fluid pipe 1 is prevented from entering between the partition wall 11 and the housing 2, and the fluid is prevented from leaking from the branch portion 2a. prevented.

Next, as shown in FIG. 22, the fluid in the cylindrical member 61 and the mounting flange cylinder 63 is discharged to the outside, and access is made through the working hole 61b of the cylindrical member 61, and the mounting surface portion 64a of the valve suspension fitting 64 and the butterfly are mounted. The bolt-nut connection with the upper lid portion 14 of the valve 10 is released. Then, the shaft member 81 is moved backward in the reverse order of the above steps, and the valve hanging fitting 64 is pulled up inside the cylindrical member 61 and the mounting flange cylinder 63, whereby the butterfly valve 10 is installed at the cut portion of the fluid pipe 1. work is completed.

Although not shown in particular, first, the drive mechanism 8 is removed from the cover 65, the cover 65 and the valve hanging fitting 64 are removed from the mounting flange cylinder 63, the mounting flange cylinder 63 is removed from the cylindrical member 61, and the cylindrical member 61 is removed. is removed from the working valve 4, the removal work of the valve introducing machine 6 is completed. In this way, since each member constituting the valve introducer 6 can be separately transported by a crane, the load on the crane during the removal work of the valve introducer 6 can be reduced. After that, by removing the working valve 4 from the branch portion 2a of the housing 2, a series of operations of cutting a predetermined portion of the fluid pipe 1 and installing the butterfly valve 10 at the cut portion is completed.

Needless to say, when cutting or introducing valves in a non-interrupted state, lids are attached to all windows and working holes in a hermetically sealed manner.

Next, the work valve of Modification 1 will be described with reference to FIG. 23 . It should be noted that the description of the configuration that is the same as that of the above-described embodiment and overlaps will be omitted.

As shown in FIG. 23 , the working valve 400 in Modification 1 includes a substantially cylindrical valve box 401 penetrating in the vertical direction, and the valve boxes 401 are arranged on both sides of the fluid pipe 1 in the axial direction. It is composed of valve bodies 402A and 402B, valve lids 403A and 403B that accommodate the valve bodies 402A and 402B, and valve rods 404A and 404B that move the valve bodies 402A and 402B relative to the valve lids 403A and 403B.

The valve box 401 is provided with openings 401a and 401b facing each other in the axial direction of the fluid pipe 1, and a slide groove 401c is formed so as to communicate the openings 401a and 401b. The working valve 400 is configured by hermetically fixing the valve lids 403A and 403B to the valve case 401 with the valve bodies 402A and 402B respectively inserted into the openings 401a and 401b. By advancing the valve bodies 402A and 402B from both sides of the valve box 401, the tips of the valve bodies 402A and 402B come into contact with each other and the branch portion 2a of the housing 2 can be closed.

In this way, the valve bodies 402A and 402B, the valve lids 403A and 403B, and the valve stems 404A and 404B have a split structure, and by installing them separately in order, the load on the crane used when installing the work valve 400 is reduced. can. Also, the valve body 401 has openings 401a and 401b on opposite sides, and the valve bodies 402A and 402B, the valve lids 403A and 403B, and the valve stems 404A and 404B are attached to the openings 401a and 401b. , the weight balance of the working valve 400 can be stabilized, and the uneven load applied to the connecting portion between the working valve 400 and the housing 2 can be suppressed.

Next, a work valve of Modification 2 will be described with reference to FIG. 24 . As shown in FIG. 24, the working valve 410 includes a first split member 412 in which a half member 411A (divided body of the valve body), a valve body 402A, a valve lid 403A and a valve stem 404A are unitized, and a half split body. A second split body 413 in which the member 411B (divided body of the valve body), the valve body 402B, the valve lid 403B, and the valve stem 404B are unitized, and the first split body 412 and the second split body 413 are combined into a housing. It may be constructed by assembling on the branch 2 a of the body 2 . The work valve 410 may be configured by assembling each member to the branch portion 2a of the housing 2. As shown in FIG. In this case, the load on the crane can be reduced because the valve box is composed of a plurality of split members 411A and 411B.

In the above-described embodiment, the cutter 52 is a hole saw composed of a cylindrical member 52a and a center drill 52b, but the present invention is not limited to this and can be freely modified. For example, as shown in FIG. 25, a cutting machine 500 in Modification 3 includes a cutter mechanism 501 externally fitted to a predetermined location of the fluid pipe 1 within the housing 20, and a work case mounted above the work valve 402. 502 and a drive mechanism 800 that drives the cutter mechanism 501 and can be pulled up into the work case 502 .

The cutter mechanism 501 includes two sprockets 501a, 501a rotatably provided in the outer peripheral direction of the fluid tube 1, and a drive transmission portion 501b for transmitting driving force to the sprockets 501a, 501a. , a cutting bit (not shown) for cutting the fluid pipe 1 is attached. Further, the drive mechanism 800 includes a rod 801 connected to the drive transmission portion 501b, a motor 802 that rotationally drives the rod 801, and a lifting mechanism 803 that can lift the rod 801.

By driving the motor 802, the sprockets 501a, 501a rotate via the rod 801 and the drive transmission portion 501b, and the fluid pipe 1 can be cut. Further, the cutter mechanism 501 can be lifted into the work case 502 by the lifting mechanism 803 while the sprockets 501a, 501a hold the segment of the fluid pipe 1. As shown in FIG.

There are also the following modifications of the cutting machine. As shown in FIG. 26, a cutting machine 510 according to Modification 4 includes a tubular body 511 fixed above the branch portion 200a of the housing 200 via a working valve 403, and a tubular body 511 connected to the upper portion of the tubular body 511. a base plate 512, a movable plate 513 provided movably relative to the base plate 512, driving means 514 for applying a driving force to the movable plate 513, an end mill 515 connected to the upper portion of the movable plate 513, an end mill 515, and a rotation mechanism 523 for rotating the housing 200 in the circumferential direction.

A slit 512a is formed in the central portion of the base plate 512, and rails 517, 517 extending along the axial direction of the fluid pipe 1 are arranged in parallel on the upper surface of the base plate 512 with the slit 512a interposed therebetween. ing. A packing is fixed around the slit 512a.

The movable plate 513 has a slit 513a and recesses 518, 518 fitted to the rails 517, 517, and is slidable on the rails 517, 517. As shown in FIG. Further, the movable plate 513 is formed such that a structural portion 520 having a screw hole 519 protrudes upward. In addition, the movable plate 513 is slidably moved while sealingly contacting the packing of the slit 512 a in the base plate 512 .

The driving means 514 includes two standing pieces 521, 521 spaced apart in the tube axis direction on the upper surface of the base plate 512, and a threaded rod mounted between the standing pieces 521, 521 so as to be rotatable and immovable in the axial direction. 522 , and the threaded rod 522 is screwed into the threaded hole 519 of the structure 520 in the movable plate 513 . That is, the movable plate 513 slides in the axial direction of the fluid tube 1 by rotating the threaded rod 522 about its axis. A handle 522a is attached to one end of the threaded rod 522 so that the threaded rod 522 can be rotated by gripping the handle 522a.

According to this, the end mill 515 can be advanced while being rotated by the drive mechanism 516 to perforate the fluid tube 1. In this state, the movable plate 513 is slid in the tube axis direction of the fluid tube 1, whereby the fluid can be drilled. A first cut portion (not shown) extending in the tube axis direction can be formed in the tube 1 . After the first cutting portion is formed, the end mill 515 is positioned at the center of the first cutting portion in the axial direction, and the housing 200 is rotated by the rotation mechanism 523 to extend the first cutting portion along the circumferential direction of the fluid tube 1 . 2 cuts can be formed.

That is, by inserting the valve element 13 through the first cut portion and inserting the partition wall 11 through the second cut portion, the butterfly valve 10 is installed in the fluid pipe 1 with the valve element 13 opened. Therefore, the influence of the fluid flowing through the fluid tube 1 can be suppressed. As described above, the fluid pipe 1 is not limited to being cut as long as an opening into which a fluid control such as the butterfly valve 10 can be inserted can be formed.

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

For example, in the above embodiment, the butterfly valve 10 is used as a fluid control, but the present invention is not limited to this. For example, in the above-described embodiment, the butterfly valve 10 is composed of a plurality of divided bodies, but the present invention is not limited to this, and the fluid control may be constructed integrally.

Further, in the above embodiment, the flat lower surface of the partition wall 11 was placed on the inner bottom surface of the housing 2, but the present invention is not limited to this, for example, as shown in FIG. A cylindrical downward projection 11c extending downward is provided, and the inner bottom surface of the housing 2 is provided with a recess 2c loosely fitted to the downward projection 11c, and a plurality of screw holes 2e penetrating the side wall of the recess 2c. Pressing screws 2d, 2d screwed onto 2e may be provided. By doing so, when attaching, the partition wall 11 is suspended and advanced downward, and after the downward convex portion 11c of the partition wall 11 is loosely fitted into the concave portion 2c of the housing 2, the screw hole 2e is provided. The pressure screw 2d screwed into the housing 2 is operated from the outside of the housing 2 to advance, and the downward convex portion 11c is clamped by the pressure screws 2d, 2d on the upstream side and the downstream side. That is, the press screws 2d, 2d not only finely adjust the tilt of the butterfly valve 10 with respect to the housing 2, but also have the function of preventing the partition wall 11 from tilting due to the fluid pressure. Here, the downward convex portion 11c is not limited to being formed as a part of the partition wall 11, and may be formed separately from the partition wall 11. It may be made into a unit with the partition wall 11, and by doing so, it is possible to reduce the weight of each part before transportation and installation.

Further, in the above embodiment, the valve body 42, the valve cover 43 and the valve stem 44 (second divided body) which constitute the working valve 4 are unitized, and the holes 43b, 43b provided in the upper part of the valve cover 43 are provided with Although the wire W inserted through the shackle or the like is used for suspension, the location for suspension is not limited to this. For example, the valve body 42 and the valve lid 43 may be suspended. The number of wires W may be singular or plural, but preferably two or more.

1 fluid pipe 2 housing 2a branch (opening)
2b flange (locking part)
4 working valve 5 cutting machine 6 valve introduction machine 7 jack 8 drive mechanism 10 butterfly valve 11 partition wall 12 opening/closing shaft 13 valve element 14 upper lid section 20 housing 41 valve box (first divided body)
41a opening (valve box opening)
41c valve seat portion 42 valve body (second divided body)
43 valve cover (second split body)
44 valve stem (second split body)
51 Mounting flange cylinder 52 Cutter 53 Lid 54 Adapter 55 Fixing jig 61 Cylindrical member 62 Locking member 63 Mounting flange cylinder 65 Lid 66 Adapter 81, 81' Shaft member 86 Case part 200 Housing 200a Branch part (opening part)
400 working valve 401 valve box (first division)
402 working valves 402A, 402B valve body (second divided body)
403 work valves 403A, 403B valve lids (second split body)
404A, 404B valve stem (second split body)
410 work valves 411A, 411B half-split member 412 first split body 413 second split body 500 cutting machine 510 cutting machine

Claims (5)

A work valve mounting method for mounting a work valve to an opening of a housing for performing a predetermined work in an uninterrupted state in a housing that is hermetically attached to a fluid pipe, the method comprising:
A valve body having a valve seat as a first divided body constituting the working valve is installed in the opening of the housing, a valve body and a valve cover as a second divided body are suspended by a crane, and the second divided body is suspended by a crane. By relatively moving the valve body of the divided body with respect to the valve cover, the position of the center of gravity of the second divided body is moved, and the valve box installed at the opening of the housing moves the second valve body. A method of mounting a work valve, characterized by connecting the divided bodies of 2. The working valve installation according to claim 1 , wherein when connecting the valve body and the valve lid to the valve body, the valve body is slid and inserted into the opening of the valve body from the side. Method. 3. The method of mounting a working valve according to claim 1, wherein the second split bodies are connected to face each other on both sides of the valve body. 4. The method of mounting a work valve according to claim 1, wherein the valve body is configured by installing a divided body of the valve body in an opening of the housing. 5. The method of mounting a work valve according to claim 1 , wherein the valve body of the second split body is moved relative to the valve cover by a feed screw mechanism.

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