Assembly method for a fluid control device

Abstract

To provide a method for assembling a fluid control installation device capable of reducing a load to a crane.SOLUTION: In a method for assembling a fluid control installation device including a housing 2 attached to a fluid pipe 1 in hermetic seal manner, a work valve 4 attached to its opening part to be able to open / close the inside of the housing 2, and a cutting machine including a cutter for cutting the fluid pipe 1 inside the housing 2 and a drive part 8 for driving the cutter, and suspending and installing the cutting machine and a fluid control 10 in a state with no fluid in the pipe in order to install the fluid control 10 for controlling a channel of the fluid pipe 1 in the housing 2 in a non-interrupted state, the cutter of a first split body and the drive part 8 of a second split body are assembled after attaching the housing 2 to the fluid pipe 1 in a hermetic seal manner, the cutter is moved to the outside of the housing 2 to close the work valve 4 after driving the cutter by the drive part 8 of the cutting machine to cut the fluid pipe 1 in the housing 2, the fluid control 10 and the drive part 8 constituting the cutting machine are assembled to open the work valve 4, and the fluid control 10 is driven by the drive part 8 to be installed in the housing 2.SELECTED DRAWING: Figure 17

Description

Technical Field

[0001] The present invention relates to an assembly method of an installation device for installing a control fluid in a housing that seals a fluid pipe in a non-stop flow state.

Background Art

[0002] <00000=09>When arranging a control fluid such as a valve or a plug in a fluid pipeline, it is generally performed by cutting a part of the fluid pipe constituting the fluid pipeline and installing the control fluid at the cut portion. As a cutting method for cutting a fluid pipe, a housing is attached to the fluid pipe in a sealed manner, a work valve capable of opening and closing the inside of the housing is attached to an opening of the housing, a cutting machine having a cutter and a drive unit is installed in the work valve, and the cutter is advanced by the drive unit with the work valve open to cut a part of the fluid pipe in a non-stop flow state inside the housing.

[0003] Further, as a method for installing a control fluid at a location where a fluid pipe is cut by the above method, for example, as shown in Patent Document 1, there is a control fluid installation method using a housing, a work valve, and an insertion machine attached to the work valve. The control fluid is advanced by the insertion machine with the work valve open to install the control fluid in the housing in a non-stop flow state. In such a control fluid installation method, each member such as the housing, the work valve, and the control fluid is suspended by a crane and transported to the installation position and assembled to the fluid pipe (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the installation of a fluid control system as described in Patent Document 1, especially when the diameter of the fluid pipe is large, the housing that fits the fluid pipe, the work valve, and the fluid control system installed inside the housing also become larger. This necessitates the use of a large crane with high lifting capacity, which increases the crane's range of motion and installation space, thus creating a problem in that a large space must be secured for the fluid control system installation work. In particular, when a hole saw is used as a cutting machine as in Patent Document 1, a hole saw with a larger diameter than the outer diameter of the fluid pipe is required. Consequently, the weight of the housing that accommodates the hole saw and the fluid control system installed in a sealed state inside this housing increases, making it unavoidable to use a large crane.

[0006] This invention was made in view of these problems, and aims to provide an assembly method for a fluid control device that can reduce the load on a crane. [Means for solving the problem]

[0007] To solve the above problems, the assembly method of the fluid control device of the present invention is: A method for assembling a control fluid installation device for installing a control fluid that controls the flow path of the fluid pipe in a continuous flow state inside the housing, comprising: a housing that is sealed and attached to a fluid pipe; a work valve attached to the opening of the housing and capable of opening and closing the inside of the housing; a cutting machine attached to the work valve and having a cutter for cutting the fluid pipe inside the housing and a drive unit for driving the cutter, the device comprising: a housing that is sealed and attached to a fluid pipe; a work valve attached to the opening of the housing and capable of opening and closing the inside of the housing; a cutting machine having a cutter for cutting the fluid pipe inside the housing and a drive unit for driving the cutter, the device for installing a control fluid that controls the flow path of the fluid pipe in a continuous flow state, At least one of the aforementioned work valve, cutting machine, or fluid control device is composed of a plurality of divided parts, and is characterized in that the housing is attached to the fluid pipe in a sealed manner, and then the divided parts are sequentially assembled to the housing. This feature allows multiple segmented components constituting a work valve, cutting machine, or fluid control system to be transported separately by crane, reducing the load on the crane supporting them and enabling the crane to be made smaller.

[0008] The method is characterized by locking a first of the plurality of divided parts onto a locking portion provided on the housing, and then assembling the remaining second parts onto the first part that is locked onto the locking portion. This feature allows the remaining second segments to be attached with high precision to the first segment, which is in a stable state with the first segment locked to the locking part of the housing.

[0009] The method is characterized by assembling the second segment into the first segment while the second segment is connected to the crane. This feature makes it possible to prevent the second segment from falling when assembling it onto the first segment, thus ensuring high safety.

[0010] The cutting machine is composed of the cutter and the drive unit as the plurality of divided parts, and the drive unit is characterized in that the control fluid is connected so that it can be inserted into the housing. This feature allows the drive unit and cutter, which constitute the cutting machine, to be separated, and the drive unit used to drive the cutter can be used as a fluid control device. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side cross-sectional view showing how the valve body of the work valve is attached to the housing in the embodiment. [Figure 2] This is a side cross-sectional view showing how the valve body and valve stem are attached to the valve casing. [Figure 3] This is a side cross-sectional view showing the process of attaching the mounting flange cylinder to the work valve during the installation of the cutting machine. [Figure 4] This is a side cross-sectional view showing the process of attaching the cutter and cover to the mounting flange cylinder during the installation of the cutting machine. [Figure 5] This is a side cross-sectional view showing the lid being fixed to the mounting flange cylinder during the process of installing the cutting machine. [Figure 6] This is an explanatory diagram showing the structure of the drive mechanism. [Figure 7]It is a side sectional view showing the state where the shaft member and the cutter are connected in the process of installing the cutting machine. [Figure 8] It is a side sectional view showing the state where the jack and the fixing jig are removed in the process of installing the cutting machine. [Figure 9] It is a side sectional view showing the state where the case part of the drive mechanism and the lid body are connected in the process of installing the cutting machine. [Figure 10] It is a side sectional view showing the state where the fluid pipe is cut by the cutting machine. [Figure 11] It is a side sectional view showing the state where the section of the fluid pipe is recovered. [Figure 12] It is a side sectional view showing the state where the cylindrical member is attached to the working valve in the process of installing the valve introduction machine. [Figure 13] It is a side sectional view showing the state where the partition wall, the opening and closing shaft, and the valve body in the butterfly valve are attached to the cylindrical member in the process of installing the valve introduction machine. [Figure 14] It is a side sectional view showing the state where the upper lid part is attached to form the butterfly valve in the process of installing the valve introduction machine. [Figure 15] It is an explanatory view showing the state where the attachment flange cylinder is attached to the cylindrical member in the process of installing the valve introduction machine. [Figure 16] It is a side sectional view showing the state where the valve suspension fitting and the lid body are attached in the process of installing the valve introduction machine. [Figure 17] It is a side sectional view showing the state where the lid body is fixed to the attachment flange cylinder in the process of installing the valve introduction machine. [Figure 18] It is a side sectional view showing the state where the shaft member and the valve suspension fitting are connected in the process of installing the valve introduction machine. [Figure 19] It is a side sectional view showing the state where the jack and the fixing jig are removed in the process of installing the valve introduction machine. [Figure 20] It is a side sectional view showing the state where the butterfly valve and the valve suspension fitting are connected in the process of installing the valve introduction machine. [Figure 21] It is a side sectional view showing the state where the butterfly valve is installed at the cutting location of the fluid pipe by the valve introduction machine. [Figure 22] This is a side cross-sectional view showing the valve suspension fitting pulled up into the cylindrical member and mounting flange cylinder. [Figure 23] This is a side cross-sectional view showing the work valve in modified example 1. [Figure 24] This is a side cross-sectional view showing the work valve in modified example 2. [Figure 25] This is a side cross-sectional view showing the cutting machine in modified example 3. [Figure 26] (a) is a side cross-sectional view showing the cutting machine in modified example 4, (b) is a view along arrow A, and (c) is a cross-sectional view along BB. [Modes for carrying out the invention]

[0012] An embodiment for implementing the assembly method of a fluid control device installation apparatus according to the present invention will be described below based on an example. [Examples]

[0013] In this embodiment, a series of steps from cutting a predetermined location in an existing fluid pipe 1 that constitutes a flow path component to installing a butterfly valve 10 (fluid control) at the cut location will be explained with reference to Figures 1 to 26.

[0014] As shown in Figure 1, the area around a predetermined location of the fluid pipe 1 buried underground is excavated, and a two-part housing 2 having a branch section 2a opening upwards is sealed around it. The fluid inside the fluid pipe 1 may be, for example, tap water, industrial water, sewage, gas, or a gas-liquid mixture. Furthermore, although the housing 2 is a two-part structure in this embodiment, it may be a multi-part structure, and the divided housings may be joined together by welding or by bolts with gaskets.

[0015] The fluid pipe 1 is a steel pipe and is formed in a substantially circular shape in cross-section. The fluid pipe according to the present invention may be made of ductile cast iron, other cast iron, other metals, or concrete, polyvinyl chloride, polyethylene, or polyolefin. Furthermore, the inner circumferential surface of the fluid pipe may be covered with an epoxy resin layer, mortar, plating, or an appropriate material may be applied to the inner circumferential surface of the fluid pipe by powder coating.

[0016] Furthermore, when attaching the housing 2 to the fluid pipe 1 in a sealed manner, concrete foundations 9,9 are formed below the housing 2 to support the weight around the housing 2 and prevent bending of the fluid pipe 1. Note that the concrete foundations 9,9 are not the only options; jacks or other supports capable of supporting the weight of the housing 2 and the cutting machine 5 and valve introduction machine 6 described later may also be used.

[0017] Next, the process of attaching a work valve 4 capable of closing the opening of the branch section 2a to the branch section 2a (opening) of the housing 2 will be described. First, as shown in Figure 1, the valve body 41 (first segment) constituting the work valve 4 is suspended from above by a lifting device C equipped with a hook and wire W suspended from a crane (not shown) and placed on the flange 2b of the branch section 2a. The position of the valve body 41 is adjusted on the flange 2b, and the flange 2b and the valve body 41 are fixed together with bolts and nuts (not shown). In this embodiment, for example, a mobile rough terrain crane is preferred, and needless to say, it is enlarged according to its lifting capacity, and a specification that can lift the heaviest component among the components described later is selected while considering the allowable lifting load at each turning radius. Also, the installation area of ​​the crane, including outriggers, etc., is often larger than the excavation area of ​​the fluid pipe 1.

[0018] In this embodiment, even after the valve body 41 is placed on the flange 2b of the branch section 2a, the wire W is connected to the crane with the wire slightly loosened to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the valve body 41. Furthermore, to facilitate position adjustment of the valve body 41, the valve body 41 may be slightly suspended by the crane while its position is adjusted relative to the flange 2b.

[0019] The valve body 41 is roughly cylindrical in shape, penetrating vertically, and has a slide groove 41b extending roughly horizontally from an opening 41a on one side. A valve seat portion 41c is formed at the back of the slide groove 41b (opposite the opening 41a). In this embodiment, the weight of the valve body 41 is approximately 4500 kg. An O-ring (not shown) is pressed between the flange 2b and the valve body 41, so that the branch portion 2a and the valve body 41 are sealed together. The weights of the components described herein are merely examples and can be changed to suit the requirements.

[0020] Next, as shown in Figure 2, the valve body 42, valve cover 43, and valve stem 44 (second segment) that constitute the work valve 4 are suspended by a lifting device C and wire W and lowered to the side of the opening 41a of the valve body 41. Then, in this suspended state, the valve cover 43 is fixed to the side of the valve body 41 with bolts and nuts (not shown) or the like (see Figure 3). Specifically, the valve body 42 is mounted so as to be able to move back and forth between a position where it is housed inside the valve cover 43 by the valve stem 44 and a position where it protrudes from the valve cover 43. In the position where it is housed inside the valve cover 43, a part of the valve body 42 (the end opposite to the valve stem 44 (the valve body 41 side)) protrudes from the opening 43a of the valve cover 43.

[0021] When fixing the valve cover 43 to the side of the valve body 41, the protruding portion of the valve element 42 that protrudes from the opening 43a of the valve cover 43 is inserted into the opening 41a of the valve body 41, and the valve cover 43 is slid horizontally until it contacts the valve body 41, and the valve cover 43 and the valve body 41 are fixed together with bolts and nuts (not shown). In this embodiment, the weight of the valve element 42, valve cover 43 and valve stem 44 in a unitized state is approximately 6000 kg.

[0022] Furthermore, since the packing S1 is pressed against the valve cover 43 and the valve body 41 in the circumferential direction, airtightness between the valve cover 43 and the valve body 41 can be ensured (see enlarged view in Figure 3). In this embodiment, a configuration in which the packing S1 is press-fitted into a groove provided on the valve cover 43 side is illustrated, but the embodiment is not limited to this, and a groove may be provided on the valve body 41 side, and the packing S1 may be press-fitted into the groove.

[0023] In this embodiment, the example shows the unitized valve body 42, valve cover 43, and valve stem 44 being suspended by a suspension device C and wire W and attached to the valve casing 41. However, the embodiment is not limited to this, and for example, a mounting platform may be placed near the valve casing 41, and the valve body 42, valve cover 43, and valve stem 44 may be placed on the mounting platform and then attached to the valve casing 41.

[0024] Thus, the work valve 4 is composed of a first segment (approximately 4500 kg) consisting of a valve body 41, and a second segment (approximately 6000 kg) consisting of a valve body 42, valve cover 43, and valve stem 44. The work valve 4 is constructed by assembling these segments in order onto the branch section 2a of the housing 2. In other words, since the first segment and the second segment can be transported separately using the lifting device C and wire W, the load on the crane can be distributed and reduced compared to when the work valve 4 is installed on the branch section 2a in an assembled state (work valve 4 with a total weight of 10500 kg). This allows for a smaller crane and reduces the workspace required to install the work valve 4. Furthermore, the load on the lifting device C and wire W is also reduced, eliminating the need to prepare thicker lifting devices C and wire W, thus lowering the cost of the lifting devices C and wire W used.

[0025] Furthermore, as will be described later, when a hole saw such as the cutter 52 in this embodiment is used as a means of cutting the fluid pipe 1, the hole saw will have a larger diameter than the outer diameter of the fluid pipe 1, and consequently the structure of the work valve 4 will also become larger. However, even in such a case, the first divided body and the second divided body can be transported separately by the lifting device C and wire W, so the crane can be suitably miniaturized.

[0026] In this example, the valve body 42, valve cover 43, and valve stem 44 are fixed to the valve casing 41 as a unit from the perspective of workability. However, this is not the only option. For example, the valve body 42, valve cover 43, and valve stem 44 may be attached separately to the valve casing 41 in that order to further distribute and reduce the load on the crane.

[0027] Furthermore, the work valve 4 is composed of a valve body 41 installed above the branch section 2a, and a valve element 42, valve cover 43, and valve stem 44 that bulge laterally from the valve body 41. Since the valve body 41 is fixed to the branch section 2a first, and then the valve element 42, valve cover 43, and valve stem 44 are fixed to the valve body 41, the installation of the valve body 41 to the branch section 2a is simplified because the suspended load does not tilt due to weight balance when the valve body 41 is installed to the branch section 2a. Similarly, when connecting the valve element 42, valve cover 43, and valve stem 44 to the valve body 41, the suspended load does not tilt due to weight balance, and the connection of the valve element 42, valve cover 43, and valve stem 44 to the valve body 41 is simplified. In addition, since it is not necessary to suspend the work valve 4 at multiple points to maintain the weight balance of the work valve 4, the workspace required to install the work valve 4 can be suitably reduced.

[0028] Furthermore, when connecting the valve element 42, valve cover 43, and valve stem 44 to the valve casing 41, the valve element 42 is inserted into the opening 41a of the valve casing 41, and the valve cover 43 is slid from the side until it contacts the valve casing 41. This guides the valve element 42 to the valve casing 41, allowing the valve element 42, valve cover 43, and valve stem 44 to be positioned accurately relative to the valve casing 41.

[0029] In this embodiment, the valve cover 43 and the valve body 41 are shown to be fixed together with bolts and nuts, but the embodiment is not limited to this. For example, they may be fixed together with other fixing means such as a vise, or they may be fixed together by welding.

[0030] Next, the process of installing a cutting machine 5 for cutting the fluid pipe 1 above the work valve 4 will be described. As shown in Figure 3, first, the mounting flange cylinder 51 (cylindrical body) that penetrates vertically is suspended by the lifting device C and wire W and lowered above the valve body 41, and the mounting flange cylinder 51 is fixed above the valve body 41 with bolts and nuts (not shown). The weight of the mounting flange cylinder 51 in this embodiment is approximately 2600 kg. In addition, an O-ring (not shown) is pressed between the mounting flange cylinder 51 and the valve body 41, so that the valve body 41 and the mounting flange cylinder 51 are connected in a sealed manner.

[0031] In this embodiment, even after the mounting flange cylinder 51 is placed on the valve body 41, the wire W is connected to the mounting flange cylinder 51 with a slightly loosened state to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the mounting flange cylinder 51. Furthermore, to facilitate position adjustment of the mounting flange cylinder 51, the mounting flange cylinder 51 may be slightly suspended by the crane while its position is adjusted relative to the valve body 41.

[0032] Next, as shown in Figure 4, the cutter 52 is temporarily installed on the mounting flange cylinder 51. Specifically, with the cover 53 of the mounting flange cylinder 51 connected to the top of the cutter 52, it is suspended by the lifting device C and wire W and lowered to the top of the mounting flange cylinder 51. The cutter 52 consists of a cylindrical member 52a with cutting blades at its circumferential end and a center drill 52b which is arranged coaxially with the cylindrical member 52a and protrudes further than the drilling blade, and the cylindrical member 52a and the center drill 52b are fixed together. In addition, an adapter 54 with an annular projection 54a formed at its upper end is attached above the cylindrical member 52a and the center drill 52b so as not to rotate relative to it.

[0033] Furthermore, the lid 53 has a through hole 53a that penetrates vertically through its center, and the adapter 54 is inserted through the through hole 53a. In addition, the lid 53 has multiple recesses 53b formed in the circumferential direction, recessed radially outward from the inner circumferential surface of the through hole 53a, and a fixing jig 55 that can move back and forth radially in the through hole 53a is disposed in the recesses 53b. The fixing jig 55 protrudes in the radial direction inward from the through hole 53a and engages with the lower surface of the annular projection 54a of the adapter 54, thereby integrating the cutter 52 and the lid 53.

[0034] In this embodiment, the cutter 52 weighs approximately 2910 kg, the lid 53 weighs approximately 1900 kg, and the adapter 54 weighs approximately 290 kg, with a total weight of approximately 5100 kg.

[0035] As shown in Figure 5, the mounting flange cylinder 51 and the cover 53 are aligned with the cover 53 with the cover 53 placed on top of the mounting flange cylinder 51, and then fixed in place with bolts and nuts (not shown). At this time, the cutter 52 will be housed inside the mounting flange cylinder 51.

[0036] Furthermore, as shown in the enlarged section of Figure 5, the packing S2 is pressed against the mounting flange cylinder 51 and the cover 53 in the circumferential direction, thereby ensuring a tight seal between the mounting flange cylinder 51 and the cover 53. In this embodiment, the packing S2 is press-fitted into a groove provided on the cover 53 side, but the embodiment is not limited to this; a groove may be provided on the mounting flange cylinder 51 side, and the packing S2 may be press-fitted into this groove.

[0037] In this embodiment, even after the cover 53 is placed on the mounting flange cylinder 51, the wire W is connected to the cover 53 with a slight slack to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the cover 53. Also, to facilitate position adjustment of the mounting flange cylinder 51, the mounting flange cylinder 51 may be slightly suspended by the crane while its position is adjusted relative to the valve body 41.

[0038] Next, the drive mechanism 8 (drive unit) of the cutting machine 5 is connected to the cutter 52. First, the structure of the drive mechanism 8 will be explained based on Figure 6.

[0039] As shown in Figure 6, the drive mechanism 8 mainly consists of a shaft member 81, a gripping member 82 capable of gripping or releasing the shaft member 81, a reciprocating member 83 that moves the gripping member 82 back and forth within the axial range of the shaft member 81, a restricting member 84 that can restrict or release the movement of the shaft member 81 at a position below the reciprocating member 83, and a base member 85 to which the reciprocating member 83 and the restricting member 84 are attached. The weight of the drive mechanism 8 in this embodiment is approximately 6060 kg.

[0040] The base member 85 is provided with multiple support columns 85a that are erected on top of it, and the reciprocating member 83 is mounted so as to be slidable vertically along the support columns 85a. In other words, the shaft member 81 is gripped by the gripping member 82, and in that state, the reciprocating member 83 is moved along the support columns 85a, thereby allowing the shaft member 81 to slide vertically.

[0041] Furthermore, a cylindrical case portion 86 through which the shaft member 81 can be inserted is provided below the base member 85. A packing S3 is provided on the inner circumferential surface of the case portion 86 to seal the space between it and the outer circumferential surface of the shaft member 81, and an annular groove 86a is formed on the lower surface of the case portion 86, into which an annular packing S4 is press-fitted.

[0042] Furthermore, a rotary motor 87 is fixed to a part of the reciprocating member 83, and by applying rotational force to the gripping member 82, which is gripping the shaft member 81, rotation can be transmitted to the shaft member 81, and the rotation of the shaft member 81 can cause the cutter 52 to rotate. In addition, by providing multiple shaft members 81, the axial length can be increased by joining them together in the axial direction, and this joining structure can reduce weight and height.

[0043] As shown in Figure 7, when connecting the drive mechanism 8 to the cutter 52, multiple jacks 7 (spacers) are placed circumferentially around the upper flange 53c of the cover 53, the shaft member 81 is advanced downward by a predetermined length in advance, so that the lower end of the shaft member 81 protrudes below the case portion 86, the drive mechanism 8 is suspended by the lifting device C and wire W, and the case portion 86 is placed on the jacks 7. Next, an operator accesses the gap between the case portion 86 formed by the jacks 7 and the upper flange 53c of the cover 53 and connects the shaft member 81 and the adapter 54 with bolts and nuts N1.

[0044] In this embodiment, even after the drive mechanism 8 is placed on the jack 7, the wire W is connected to the drive mechanism 8 with a slight slack to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the drive mechanism 8. Furthermore, to facilitate position adjustment of the drive mechanism 8, the position of the shaft member 81 and the adapter 54 may be adjusted while the drive mechanism 8 is slightly suspended by the crane.

[0045] Next, as shown in Figure 8, the drive mechanism 8, adapter 54, and cutter 52 are lifted slightly upward by the crane, the jack 7 is removed from between the case 86 and the lid 53, and the fixing jig 55 is moved into the recess 53b. At this time, the cutter 52 (approximately 2910 kg), adapter 54 (approximately 290 kg), and drive mechanism 8 (approximately 6060 kg) are lifted by the crane, so the weight on the crane is approximately 9260 kg. In this case, multiple jacks 7 (spacers) may be placed around the lower flange 53d of the lid 53, and the drive mechanism 8 may be placed on top of the jacks 7 to support the weight and reduce the weight on the crane.

[0046] Next, as shown in Figure 9, the drive 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 fixed together with bolts and nuts (not shown). In this way, the cutting machine 5 is formed by the mounting flange cylinder 51, cutter 52, lid 53, adapter 54 and drive mechanism 8, and the cutting device is formed by the housing 2, work valve 4 and cutting machine 5. Needless to say, the center drill 52b is adjusted so that it does not come into contact with the valve body 42.

[0047] Furthermore, when the case portion 86 and the lid 53 are fixed together, the packing S4 is pressed against the case portion 86 and the upper flange 53c of the lid 53, thereby ensuring a tight seal between the case portion 86 and the lid 53. In this embodiment, the packing S4 is shown pressed into an annular groove 86a formed on the lower surface of the case portion 86, but the embodiment is not limited to this. An annular groove may also be provided on the upper flange 53c side of the lid 53, and the packing S4 may be pressed into the annular groove.

[0048] In this embodiment, even after the case section 86 is placed on the lid 53, the wire W is connected to the drive mechanism 8 with the crane slightly loosened to ensure safety. However, this is not limited to this, and the lifting device C and wire W may be removed from the drive mechanism 8. Also, to facilitate position adjustment of the drive mechanism 8, the position of the case section 86 and the lid 53 may be adjusted while the drive mechanism 8 is slightly suspended by the crane.

[0049] Next, the process of cutting the fluid pipe 1 with the cutting machine 5 will be described. As shown in Figure 10, first, the valve body 42 of the work valve 4 is retracted to open the branch section 2a, and the outer circumferential surface of the rear end of the shaft member 81 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, with the shaft member 81 and the cutter 52 rotated, the reciprocating member 83 is advanced toward the fluid pipe 1. As a result, the center drill 52b of the cutter 52 first drills into the pipe wall of the fluid pipe 1.

[0050] The forward movement of the shaft member 81 and the cutter 52 occurs within the range from the gripping position of the shaft member 81 to a position close to the restricting member 84. The shaft member 81 moves forward by sliding against the packing S3, and after the forward movement is complete, the movement of the shaft member 81 and the cutter 52 is restricted by the restricting member 84. Subsequently, 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 the above process is repeated so that the cylindrical member 52a of the cutter 52 cuts the fluid pipe 1. At this time, it is not necessarily required to connect another shaft member 81', and the cutting may be completed using a shaft member 81 of a predetermined length in advance.

[0051] As shown in Figure 11, when the fluid pipe 1 is cut by the cutter 52, the section 1a formed by the cutting of the fluid pipe 1 is held inside the cylindrical member 52a. Then, by moving the shaft member 81 and the cutter 52 backward in the reverse order of the above process, the section 1a is pulled up into the mounting flange cylinder 51, and the branch section 2a is closed by the valve body 42 of the work valve 4, thereby completing the cutting of the fluid pipe 1.

[0052] As described above, the housing 2 is sealed and attached to the fluid pipe 1, and a work valve 4 is attached to the branch section 2a of the housing 2. Then, the cutter 52, lid 53, and adapter 54 are installed in the work valve 4 as a unit, and the drive mechanism 8 is attached to the cutter 52, lid 53, and adapter 54 installed in the work valve 4 to constitute the cutting machine 5. With this configuration, the cutter 52, lid 53, and adapter 54 (approximately 5100 kg) and the drive mechanism 8 (approximately 6060 kg) of the cutting machine 5 can be transported separately. Compared to the case where the cutting machine 5 is installed in the work valve 4 as an assembly (approximately 11160 kg), the load on the crane can be distributed and reduced, allowing for a smaller crane and saving space in the workspace where the cutting machine 5 is installed.

[0053] In particular, when using a hole saw such as the cutter 52 as in this embodiment, a cylindrical member 52a with a diameter at least larger than the fluid pipe 1 is required, which increases the size of the cutting machine 5. However, even in such cases, since the cutter 52, lid 53, adapter 54 and drive mechanism 8 are installed separately, the load on the crane can be distributed, allowing the crane to be made more compact.

[0054] In this example, the cutter 52, cover 53, and adapter 54 are fixed to the mounting flange cylinder 51 as a unit for ease of operation. However, the example is not limited to this configuration. For example, the cutter 52, cover 53, and adapter 54 may be attached to the mounting flange cylinder 51 separately and sequentially to further distribute and reduce the load on the crane. In this case, a holding means for holding the cutter 52 within the mounting flange cylinder 51 should be provided.

[0055] Furthermore, a mounting flange cylinder 51 (approximately 2600 kg) capable of housing the cutter 52 is installed in the work valve 4, and the cutter 52, cover 53, and adapter 54 are installed in the mounting flange cylinder 51. As a result, the cutter 52 is inserted while being guided by the mounting flange cylinder 51, allowing for precise positioning and installation relative to the fluid pipe 1. In addition, the load on the crane can be reduced compared to when the cutter 52, cover 53, adapter 54, and mounting flange cylinder 51 are installed in the work valve 4 as a unit (approximately 7700 kg).

[0056] Furthermore, since the cutter 52 and the cover 53 are connected by a fixing jig 55, and the cutter 52 is housed inside the mounting flange cylinder 51, and the cover 53 and the mounting flange cylinder 51 are fixed together, the cutter 52 can be held using the cover 53 which seals the mounting flange cylinder 51. This eliminates the need to prepare a special jig for holding the cutter 52 separately from the cover 53, thus simplifying the structure.

[0057] Furthermore, with the case portion 86 of the drive mechanism 8 separated from the lid 53, the cutter 52 (adapter 54) and the shaft member 81 of the drive mechanism 8 are connected via the through hole 53a of the lid 53, and then the case portion 86 is sealed and connected to the lid 53. This allows the cutter 52 and the shaft member 81 to be connected through the gap between the case portion 86 of the drive mechanism 8 and the lid 53, eliminating the need to form work holes or the like in the case portion 86 or lid 53 for connecting the cutter 52 and the shaft member 81, thus simplifying the structure. In addition, since the case portion 86 and the lid 53 are connected after the cutter 52 and the shaft member 81 are connected, the case portion 86 and the lid 53 are guided by the adapter 54 and the shaft member 81, and the connection work can be performed in a stable state.

[0058] Furthermore, with the jack 7 positioned as a spacer between the case portion 86 and the lid 53, the worker can access the gap between the case portion 86 and the upper flange 53c of the lid 53 formed by the jack 7 and connect the shaft member 81 and the adapter 54 with a bolt and nut N1. This prevents the drive mechanism 8 from falling during the connection work between the shaft member 81 and the adapter 54, thus ensuring high safety. In addition, by placing the case portion 86 on the jack 7, the case portion 86 is more stable compared to when it is suspended by the lifting device C and wire W, making it easier to connect the shaft member 81 and the adapter 54.

[0059] Although not specifically shown in the diagram, with the valve body 42 of the work valve 4 blocking the branch section 2a, first the drive mechanism 8 is removed from the cover 53, then the cover 53 and the cutter 52 together with the cut piece 1a are removed from the mounting flange cylinder 51, and finally the mounting flange cylinder 51 is removed from the work valve 4, thereby completing the removal of the cutting machine 5. In this way, each component constituting the cutting machine 5 can be transported separately by crane, thus reducing the load on the crane during the removal of the cutting machine 5.

[0060] Next, the process of installing the valve introduction device 6 for installing the butterfly valve 10 at the cut location of the fluid pipe 1 will be described. As shown in Figure 12, first, with the branch section 2a closed by the valve body 42 of the work valve 4, a cylindrical member 61 (tubular body) that penetrates vertically is suspended by a lifting device C and wire W and lowered to above the work valve 4, and the cylindrical member 61 is fixed above the work valve 4 with bolts and nuts (not shown). The weight of the cylindrical member 61 in this embodiment is approximately 3000 kg. In addition, an O-ring (not shown) is pressed between the cylindrical member 61 and the work valve 4 (valve body 41), so that the cylindrical member 61 and the work valve 4 are connected in a sealed manner.

[0061] In this embodiment, even after the cylindrical member 61 is placed on the work valve 4, the wire W is connected to the crane with the wire slightly loosened to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the cylindrical member 61. Furthermore, to facilitate position adjustment of the cylindrical member 61, the position of the valve body 41 and the cylindrical member 61 may be adjusted while the cylindrical member 61 is slightly suspended by the crane.

[0062] Next, we will explain the process of temporarily installing the butterfly valve 10 on the cylindrical member 61. First, we will explain the structure of the butterfly valve 10 based on Figure 14.

[0063] As shown in Figure 14, the butterfly valve 10 controls the flow path of the fluid pipe 1 between a state where fluid can pass through and a state where fluid cannot pass through, and comprises a partition wall 11 having an opening in the vicinity of the center, an opening / closing shaft 12 rotatably attached to the upper end of the partition wall 11, a valve body 13 provided to rotate around the opening / closing shaft 12 to open and close the opening of the partition wall 11, and a substantially circular upper cover portion 14 (cover portion) extending substantially horizontally and sealedly connected to the upper end of the partition wall 11. Packing S5 is fixed to both sides and the bottom surface of the partition wall 11, and packing S6 is fixed to the entire circumference of the outer surface of the upper cover portion 14, with packings S5 and S6 connected in a continuous manner. 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 cover portion 14 is sealed with packing or the like.

[0064] As shown in Figure 13, when temporarily installing the butterfly valve 10 in the cylindrical member 61, first, the partition wall 11, the opening / closing shaft 12, and the valve body 13 (main body) are suspended by the suspension device C and wire W and lowered to a position where they will be housed inside the cylindrical member 61. At this time, the valve body 13 is positioned so that it is approximately parallel to the pipe axis direction (with the opening of the partition wall 11 open).

[0065] Then, a locking member 62 (locking portion, holding portion) is inserted so as to partially protrude into the cylindrical member 61 from the outside through multiple window portions 61a formed in the circumferential direction of the cylindrical member 61. As a result, the protruding piece 11a that protrudes outward from the partition wall 11 is placed (locked) on the tip of the locking member 62, and the partition wall 11, opening / closing shaft 12, and valve body 13 are held by the cylindrical member 61. Furthermore, a recess 62a capable of accommodating a part of the valve body 13 is formed at the lower tip of the locking member 62, so that the locking member 62 and the valve body 13 do not interfere with each other.

[0066] Next, as shown in Figure 14, the upper cover portion 14 is suspended by the suspension device C and wire W and placed on top of the partition wall 11 with the opening / closing shaft 12 inserted through it. Then, the upper cover portion 14 and the partition wall 11 are sealed together by fixing means (not shown) to form the butterfly valve 10.

[0067] In this embodiment, even after the top cover 14 is placed on the partition wall 11, the wire W is connected to the top cover 14 with a slight slack to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the top cover 14. Furthermore, to facilitate position adjustment of the top cover 14, the position adjustment of the top cover 14, the partition wall 11, the opening / closing shaft 12, and the valve body 13 may be performed while the top cover 14 is slightly suspended by the crane.

[0068] Furthermore, in this embodiment, a configuration in which the butterfly valve 10 is constructed on a cylindrical member 61 by fixing the upper cover portion 14 to the integrated partition wall 11, opening / closing shaft 12, and valve body 13 is illustrated. However, the butterfly valve 10 may also be constructed by installing the partition wall 11, opening / closing shaft 12, valve body 13, and upper cover portion 14 separately in order. Alternatively, the partition wall 11 and valve body 13 may be integrated, and the opening / closing shaft 12 and upper cover portion 14 may be integrated and then assembled to construct the butterfly valve 10. In other words, as long as at least the upper cover portion 14 is separated from the other members (main body portion) and the butterfly valve 10 is constructed by assembling them, the configuration can be freely changed.

[0069] Next, as shown in Figure 15, the mounting flange cylinder 63, which penetrates vertically, is suspended by the lifting device C and wire W and lowered to the top of the cylindrical member 61, and the mounting flange cylinder 63 is fixed to the top of the cylindrical member 61 with bolts and nuts (not shown). The weight of the mounting flange cylinder 63 in this embodiment is approximately 2600 kg.

[0070] In this embodiment, even after the mounting flange cylinder 63 is placed on the cylindrical member 61, the wire W is connected to the mounting flange cylinder 63 with a slight slack to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the mounting flange cylinder 63. Furthermore, to facilitate position adjustment of the mounting flange cylinder 63, the mounting flange cylinder 63 may be slightly suspended by the crane while the position adjustment between the mounting flange cylinder 63 and the cylindrical member 61 is performed.

[0071] Furthermore, as shown in the enlarged view of Figure 15, an annular groove 63a is formed on 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 together, the packing S7 is pressed against the cylindrical member 61 and the mounting flange cylinder 63, thereby ensuring a tight seal between the cylindrical member 61 and the mounting flange cylinder 63. In this embodiment, the example shows the packing S7 being press-fitted into an annular groove 63a formed on the lower surface of the mounting flange cylinder 63, but the embodiment is not limited to this, and an annular groove may be provided on the cylindrical member 61 side, with the packing S7 being press-fitted into the annular groove.

[0072] Next, as shown in Figure 16, the valve hanger 64, which is connected to the butterfly valve 10, is temporarily installed on the mounting flange cylinder 63. Specifically, with the cover 65 of the mounting flange cylinder 63 attached to the top of the valve hanger 64, it is suspended by the hanger C and wire W and lowered to the top of the mounting flange cylinder 63. The valve hanger 64 comprises a mounting surface portion 64a facing approximately horizontally, a cylindrical shaft portion 64c extending upward from a through hole 64b provided approximately in the center of the mounting surface portion 64a, and a reinforcing rib 64d provided between the mounting surface portion 64a and the shaft portion 64c. An adapter 66 is also connected to the upper end of the shaft portion 64c.

[0073] Furthermore, the cover 65 has a through hole 65a that penetrates vertically through its center, and the adapter 66 is inserted through the through hole 65a. In addition, the cover 65 has multiple recesses 65b formed in the circumferential direction, recessed radially outward from the inner circumferential surface of the through hole 65a, and a fixing jig 67 that can move back and forth radially in the through hole 65a is disposed in the recesses 65b. The fixing jig 67 protrudes inward in the through hole 65a and engages with the lower surface of the annular projection 66a of the adapter 66, thereby integrating the valve hanger fitting 64 and the cover 65.

[0074] In this embodiment, the weight of the valve hanger fitting 64 is approximately 2000 kg, the weight of the cover 65 is approximately 1900 kg, and the weight of the adapter 66 is approximately 270 kg, with a total weight of approximately 4170 kg.

[0075] As shown in Figure 17, the mounting flange cylinder 63 and the mounting flange cylinder 65 are aligned with the lid 65 placed on the upper end of the mounting flange cylinder 63 and then fixed in place 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 connected to the lid 65 with the crane slightly loosened to ensure safety, but this is not the only option, and the lifting device C and wire W may be removed from the lid 65. In addition, to make it easier to adjust the position of the lid 65, the mounting flange cylinder 63 and the lid 65 may be adjusted with the lid 65 slightly suspended by the crane.

[0076] As shown in the enlarged section of Figure 17, the packing S8 is pressed against the mounting flange cylinder 63 and the cover 65 in the circumferential direction, thereby ensuring a tight seal between the mounting flange cylinder 63 and the cover 65. In this embodiment, the packing S8 is press-fitted into a groove provided on the cover 65 side, but the embodiment is not limited to this, and a groove may be provided on the mounting flange cylinder 63 side, into which the packing S8 is press-fitted.

[0077] Next, the drive mechanism 8, which acts as the insertion device for the valve introduction device 6, is connected to the valve suspension fitting 64. Since the drive mechanism 8 is the same one used during the cutting of the fluid pipe 1, a description of the structure of the drive mechanism 8 is omitted.

[0078] As shown in Figure 18, when connecting the drive mechanism 8 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 protrudes below the case portion 86. Multiple jacks 7 (spacers) are placed circumferentially around the upper flange 65c of the cover 65, and the drive mechanism 8 is suspended by a crane, with the case portion 86 placed on the jacks 7. Next, an operator accesses the gap between the case portion 86 and the upper flange 65c of the cover 65, formed by the jacks 7, and connects the shaft member 81 and the adapter 66 with bolts and nuts N2.

[0079] Next, as shown in Figure 19, the drive mechanism 8, adapter 66, and valve suspension fitting 64 are lifted slightly upward by the crane, the jack 7 is removed from between the case portion 86 and the lid 65, and the fixing jig 55 is moved into the recess 53b. At this time, the valve suspension fitting 64 (approximately 2000 kg), adapter 66 (approximately 270 kg), and drive mechanism 8 (approximately 6060 kg) are lifted by the lifting device C and wire W, so the weight on the lifting device C and wire W is approximately 8330 kg. In this case, multiple jacks 7 (spacers) may be placed circumferentially around the lower flange 65d of the lid 65, and the drive mechanism 8 may be placed on top of the jacks 7 to support the weight and reduce the weight on the crane.

[0080] Next, although not specifically shown, the drive mechanism 8 is lowered by the suspension device C and 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 65 are fixed together with bolts and nuts (not shown). When the case portion 86 and the lid 65 are fixed together, the packing S4 is pressed against the case portion 86 and the upper flange 65c of the lid 65, thereby ensuring a tight seal between the case portion 86 and the lid 65. In this embodiment, the packing S4 is provided on the lower surface of the case portion 86 as an example, but it is not limited to this, and an annular groove may be provided on the upper flange 65c side of the lid 65, and the packing S4 may be press-fitted into the annular groove.

[0081] In this embodiment, even after the case section 86 is placed on the lid 65, the wire W is connected to the drive mechanism 8 with the crane slightly loosened to ensure safety. However, this is not the only option, and the lifting device C and wire W may be removed from the drive mechanism 8. Furthermore, to facilitate position adjustment of the drive mechanism 8, the position of the case section 86 and the lid 65 may be adjusted while the drive mechanism 8 is slightly suspended by the crane.

[0082] Next, as shown in Figure 20, the drive mechanism 8 lowers the valve suspension fitting 64, and the mounting surface 64a of the valve suspension fitting 64 is connected to the upper cover 14 of the butterfly valve 10 by bolts and nuts (not shown). In this way, the cylindrical member 61, mounting flange cylinder 63, valve suspension fitting 64, cover 65, adapter 66 and drive mechanism 8 constitute the valve introduction device 6, and the housing 2, work valve 4 and valve introduction device 6 constitute the valve installation device. At this time, the opening / closing shaft 12 of the butterfly valve 10 is inserted into the shaft portion 64c of the valve suspension fitting 64.

[0083] Subsequently, the drive mechanism 8 slightly lifts the valve suspension fitting 64 and the butterfly valve 10 upward, causing the locking member 62 to retract and be pulled out from the window portion 61a of the cylindrical member 61. Although not shown in the figures, the window portion 61a is plugged to seal it tightly. Needless to say, at this time, the lower end of the butterfly valve 10 is adjusted so that it does not come into contact with the valve body 42.

[0084] Next, the process of installing the butterfly valve 10 at the cut portion of the fluid pipe 1 by the valve introduction device 6 will be described. As shown in Figure 21, the valve body 42 of the work valve 4 is retracted to open the branch section 2a, and the outer circumferential surface of the rear end of the shaft member 81 is gripped by the gripping member 82 described above. Then, the retractable member 83 is slid toward the fluid pipe 1 to advance the shaft member 81 and the butterfly valve 10 toward the fluid pipe 1.

[0085] The forward movement of the shaft member 81 and the butterfly valve 10 is performed within the range from the gripping position of the shaft member 81 to a position close to the restricting member 84, and after the forward movement is completed, the movement of the shaft member 81 and the butterfly valve 10 is restricted by the restricting member 84. Subsequently, another shaft member 81', 81' is connected to the upper end of the shaft member 81, and the above process is repeated to position the butterfly valve 10 at the cut point of the fluid pipe 1. After positioning the butterfly valve 10 at the cut point of the fluid pipe 1, the butterfly valve 10 is fixed to the housing 2 by predetermined fixing means. At this time, it is not necessarily required to connect another shaft member 81', and the position may be completed in advance using a shaft member 81 of a predetermined length.

[0086] Furthermore, when the butterfly valve 10 is fixed to the housing 2, the packing S5 of the partition wall 11 is pressed against both inner sides and the inner bottom surface of the housing 2, and the packing S6 of the top cover 14 is pressed against the inner circumferential surface of the branch section 2a. As a result, the fluid flowing through the fluid pipe 1 is prevented from leaking out from between the partition wall 11 and the housing 2, and the fluid is prevented from leaking from the branch section 2a.

[0087] Next, as shown in Figure 22, the fluid inside the cylindrical member 61 and the mounting flange cylinder 63 is discharged to the outside, and the bolt and nut connection between the mounting surface 64a of the valve hanger 64 and the upper cover 14 of the butterfly valve 10 is released by accessing it through the working hole 61b of the cylindrical member 61. Then, the shaft member 81 is moved backward in the reverse order of the above steps, and the valve hanger 64 is pulled up into the cylindrical member 61 and the mounting flange cylinder 63, thereby completing the installation of the butterfly valve 10 at the cut point of the fluid pipe 1.

[0088] Although not specifically shown in the diagram, the removal of the valve introduction machine 6 is completed by first removing the drive mechanism 8 from the cover 65, then removing the cover 65 and the valve suspension fitting 64 from the mounting flange cylinder 63, then removing the mounting flange cylinder 63 from the cylindrical member 61, and finally removing the cylindrical member 61 from the work valve 4. In this way, each component constituting the valve introduction machine 6 can be transported separately by crane, thus reducing the load on the crane during the removal of the valve introduction machine 6. Subsequently, the series of operations is completed by removing the work valve 4 from the branch section 2a of the housing 2, cutting the predetermined location of the fluid pipe 1, and installing the butterfly valve 10 at the cut location.

[0089] In this way, the butterfly valve 10 is constructed by installing a partition wall 11, an opening / closing shaft 12, and a valve body 13 on the work valve 4, and then attaching a top cover 14 to the partition wall 11, opening / closing shaft 12, and valve body 13 installed on the work valve 4. With this configuration, the main body of the butterfly valve 10, consisting of the partition wall 11, opening / closing shaft 12, and valve body 13, and the top cover 14, which is the cover part, can be transported separately. Compared to the case where the butterfly valve 10 is installed on the cylindrical member 61 in an assembled state (approximately 9540 kg), the load on the crane can be distributed and reduced, allowing for a smaller crane and saving space in the workspace required to install the butterfly valve 10.

[0090] In this embodiment, when a hole saw such as the cutter 52 is used, a cylindrical member 52a with a diameter at least larger than the fluid pipe 1 is required, which enlarges the housing 2. Consequently, the butterfly valve 10, and especially the upper cover 14 for closing the branch section 2a, also enlarges. However, even in such a case, since the partition wall 11, opening / closing shaft 12, valve body 13 and upper cover 14 are installed separately, the load on the crane is distributed, and the crane can be suitably miniaturized.

[0091] Furthermore, a cylindrical member 61 (approximately 3000 kg) capable of housing the butterfly valve 10 is installed in the work valve 4, and a partition wall 11, an opening / closing shaft 12, and a valve body 13 are installed inside the cylindrical member 61. In addition, a top cover 14 is attached to the partition wall 11, opening / closing shaft 12, and valve body 13 installed in the cylindrical member 61. Therefore, the butterfly valve 10 can be precisely positioned and installed using the cylindrical member 61 installed in the work valve 4.

[0092] Furthermore, a locking member 62 can be attached to the cylindrical member 61, and the upper cover 14 can be accurately attached in a stable state by locking the partition wall 11, opening / closing shaft 12, and valve body 13 to this locking member 62.

[0093] Furthermore, since the drive mechanism 8 and valve suspension fitting 64 (insertion device) are connected to the butterfly valve 10 while the locking member 62 is holding the butterfly valve 10, the drive mechanism 8 and valve suspension fitting 64 can be accurately attached to the butterfly valve 10 while the butterfly valve 10 is stable, and the butterfly valve 10 can be installed in the desired position inside the housing 2 by this drive mechanism 8 and valve suspension fitting 64.

[0094] Furthermore, since the drive mechanism 8 and valve suspension fitting 64 are connected after the butterfly valve 10 is assembled to form the valve introduction machine 6, the load on the crane can be reduced compared to installing the butterfly valve 10, drive mechanism 8 and valve suspension fitting 64 as a single unit on the work valve 4.

[0095] Furthermore, a jack 7 is placed as a spacer between the drive mechanism 8 and the valve suspension fitting 64 and the butterfly valve 10, specifically between the case portion 86 and the cover portion 65 of the drive mechanism 8, and the mounting surface portion 64a of the valve suspension fitting 64, which is connected to the drive mechanism 8 placed on the jack 7, is connected to the upper cover portion 14 of the butterfly valve 10. This allows the load of the drive mechanism 8 and the valve suspension fitting 64 to be supported by the jack 7 while the butterfly valve 10 is connected, which not only simplifies the connection work but also reduces the load on the crane.

[0096] As explained above, the work valve 4, cutting machine 5, and butterfly valve 10 are composed of multiple divided parts. After the housing 2 is sealed and attached to the fluid pipe 1, the divided parts are sequentially assembled onto the housing 2. Specifically, the work valve 4 is divided into a valve body 41, a valve element 42, a valve cover 43, and a valve stem 44, and these are sequentially assembled onto the housing 2 to constitute the work valve 4. Similarly, the cutting machine 5 is divided into a mounting flange cylinder 51, a cutter 52 and a cover 53, and a drive mechanism 8, and these are sequentially assembled onto the work valve 4 connected to the housing 2 to constitute the cutting machine 5. Furthermore, the butterfly valve 10 is divided into a partition wall 11, an opening / closing shaft 12 and a valve element 13, and an upper cover 14, and these are sequentially assembled onto the work valve 4 connected to the housing 2 to constitute the butterfly valve 10. According to this, the multiple divided parts constituting the work valve 4, cutting machine 5, and butterfly valve 10 can be transported separately by crane, thereby reducing the load on the crane and allowing the crane to be made smaller.

[0097] Furthermore, the first of the multiple divided parts is locked to a locking part provided on the housing 2, and the remaining second divided part is assembled to the first divided part locked to the locking part. Specifically, in the case of the work valve 4, the valve body 41, which is the first divided part, is placed (locked) on the branch part 2a (locking part) of the housing 2, and the valve body 42 and valve cover 43, which are the second divided parts, are assembled to the valve body 41. In the case of the cutting machine 5, the cutter 52, which is the first divided part, is locked to a fixing jig 55 (locking part) provided on the cover 53 of the mounting flange cylinder 51 that is connected to the housing 2 via the work valve 4, and the drive mechanism 8, which is the second divided part, is assembled to the cutter 52. In the case of the butterfly valve 10, the first divided part, the partition wall 11, is locked to a locking member 62 (locking part) provided on a cylindrical member 61 connected to the housing 2 via the work valve 4, and the second divided part, the upper cover 14, is assembled to the partition wall 11. This allows the first divided part (valve body 41, cutter 52, partition wall 11) to be locked to the locking part (branch 2a, fixing jig 55, locking member 62) of the housing 2 in a stable state, and the remaining second divided part (valve body 42 and valve cover 43, drive mechanism 8, upper cover 14) to be attached to this first divided part with high precision.

[0098] Furthermore, the cutting machine 5 is composed of a cutter 52 and a drive mechanism 8 as the aforementioned multiple divided parts, and the drive mechanism 8 is connected so that the butterfly valve 10 can be inserted into the housing 2. In other words, since the cutter 52 and the drive mechanism 8 that constitute the cutting machine 5 are separated, the drive mechanism 8 for driving the cutter 52 can be used as an insert for the butterfly valve 10. In other words, the drive mechanism 8 can be used for both driving and moving the cutter 52 and for inserting the butterfly valve 10, thus simplifying the structure.

[0099] In this embodiment, the work valve 4, cutting machine 5, and butterfly valve 10 are shown as being composed of multiple divided parts, but the present invention is not limited to this, and it is sufficient if at least one of the work valve 4, cutting machine 5, and butterfly valve 10 is composed of multiple divided parts. Furthermore, it goes without saying that all windows and work holes should be sealed with covers when cutting or introducing the valve in a continuous flow state.

[0100] Next, the work valve of Modification 1 will be described based on Figure 23. Note that the description of components that are identical to those in the above embodiment and therefore redundant will be omitted.

[0101] As shown in Figure 23, the work valve 400 in the modified example 1 consists of a valve body 401 that is roughly cylindrical and penetrates in the vertical direction, valve elements 402A and 402B arranged on both sides in the axial direction of the fluid pipe 1 in the valve body 401, valve covers 403A and 403B that house the valve elements 402A and 402B, and valve stems 404A and 404B that move the valve elements 402A and 402B relative to the valve covers 403A and 403B.

[0102] The valve body 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 to connect the openings 401a and 401b. The working valve 400 is constructed by inserting the valve bodies 402A and 402B into the openings 401a and 401b, respectively, and then fixing the valve covers 403A and 403B to the valve body 401 in a sealed manner. By advancing the valve bodies 402A and 402B from both sides of the valve body 401, the tips of the valve bodies 402A and 402B come into contact with each other, thereby closing the branch portion 2a of the housing 2.

[0103] In this way, the valve bodies 402A, 402B, valve covers 403A, 403B, and valve stems 404A, 404B are made into a separate structure, and by installing them sequentially and separately, the load on the crane used when installing the work valve 400 can be reduced. In addition, the valve body 401 has openings 401a, 401b on opposing sides, and the valve bodies 402A, 402B, valve covers 403A, 403B, and valve stems 404A, 404B are attached to the openings 401a, 401b, so the weight balance of the work valve 400 can be stabilized, and uneven loads on the connection point between the work valve 400 and the housing 2 can be suppressed.

[0104] Next, the work valve of the modified example 2 will be described with reference to Figure 24. As shown in Figure 24, the work valve 410 may be constructed by assembling the first divided body 412, which is a unitized half-split member 411A (divided part of the valve body), valve body 402A, valve cover 403A, and valve stem 404A, and the second divided body 413, which is a unitized half-split member 411B (divided part of the valve body), valve body 402B, valve cover 403B, and valve stem 404B, on the branch section 2a of the housing 2. Alternatively, the work valve 410 may be constructed by assembling each component on the branch section 2a of the housing 2. In this case, since the valve body is made up of multiple half-split members 411A and 411B, the load on the crane can be reduced.

[0105] Furthermore, although the above embodiment illustrates a form in which the cutter 52 is a hole saw composed of a cylindrical member 52a and a center drill 52b, it is not limited to this and can be freely modified. For example, as shown in Figure 25, the cutting machine 500 in Modification 3 consists of a cutter mechanism 501 fitted onto a predetermined location of the fluid pipe 1 inside the housing 20, a work case 502 mounted above the work valve 402, and a drive mechanism 800 that drives the cutter mechanism 501 and can be pulled up into the work case 502.

[0106] The cutter mechanism 501 includes two sprockets 501a, 501a that are rotatable in the outer circumference direction of the fluid pipe 1, and a drive transmission unit 501b that transmits driving force to the sprockets 501a, 501a. Cutting bits (not shown) for cutting the fluid pipe 1 are attached to the sprockets 501a, 501a. The drive mechanism 800 includes a rod 801 connected to the drive transmission unit 501b, a motor 802 that rotates the rod 801, and a lifting mechanism 803 that can lift the rod 801.

[0107] By driving the motor 802, the sprockets 501a, 501a rotate via the rod 801 and the drive transmission unit 501b, allowing the fluid pipe 1 to be cut. Furthermore, while the sprockets 501a, 501a hold the cut pieces of the fluid pipe 1, the cutter mechanism 501 can be pulled up into the work case 502 by the lifting mechanism 803.

[0108] Furthermore, the following is an example of a modified cutting machine. As shown in Figure 26, the cutting machine 510 in modified example 4 includes a cylindrical body 511 fixed above the branch portion 200a of the housing 200 via a work valve 403, a base plate 512 connected to the upper part of the cylindrical body 511, a movable plate 513 provided so as to be movable relative to the base plate 512, a driving means 514 that provides driving force to the movable plate 513, an end mill 515 connected to the upper part of the movable plate 513, a driving mechanism 516 that rotates the end mill 515, and a rotating mechanism 523 that rotates the housing 200 in the circumferential direction.

[0109] A slit 512a is formed in the center of the base plate 512, and rails 517, 517 extending along the axial direction of the fluid pipe 1 are arranged in parallel on either side of the slit 512a on the upper surface of the base plate 512. A packing is fixed around the slit 512a.

[0110] The movable plate 513 has a slit 513a and recesses 518, 518 fitted into the rails 517, 517, and is capable of sliding along the rails 517, 517. The movable plate 513 also has a structural part 520 with screw holes 519 that protrudes upward. The movable plate 513 slides while in sealed contact with the packing of the slit 512a in the base plate 512.

[0111] The driving means 514 includes two upright pieces 521, 521 spaced apart in the direction of the pipe axis on the upper surface of the base plate 512, and a threaded rod 522 that is rotatable and immovable in the axial direction, mounted between the upright pieces 521, 521. The threaded rod 522 is screwed into a threaded hole 519 of the structural part 520 of the movable plate 513. That is, the movable plate 513 slides in the direction of the pipe axis of the fluid pipe 1 as the threaded rod 522 rotates around its axis. A handle 522a is attached to one end of the threaded rod 522, allowing the threaded rod 522 to be rotated by gripping the handle 522a.

[0112] According to this, the fluid pipe 1 can be drilled by advancing the end mill 515 while rotating it with the drive mechanism 516, and by sliding the movable plate 513 in the direction of the pipe axis of the fluid pipe 1 in that state, a first cutting portion (not shown) extending in the direction of the pipe axis can be formed in the fluid pipe 1. Furthermore, after forming the first cutting portion, a second cutting portion extending along the circumferential direction of the fluid pipe 1 can be formed by positioning the end mill 515 at the axial center of the first cutting portion and rotating the housing 200 with the rotation mechanism 523.

[0113] In other words, by inserting the valve body 13 through the first cut portion and the partition wall 11 through the second cut portion, the butterfly valve 10 can be installed inside the fluid pipe 1 with the valve body 13 open, thereby suppressing the influence of the fluid flowing through the fluid pipe 1. Thus, as long as an opening can be formed into which at least a fluid control fluid such as the butterfly valve 10 can be inserted and installed, it is not limited to cutting the fluid pipe 1.

[0114] Although embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any changes or additions that do not depart from the spirit of the present invention are also included.

[0115] For example, in the above embodiment, a butterfly valve 10 is used as the fluid control element, but the present invention is not limited thereto. For example, the fluid control element may be a gate valve, a plug, or a switching valve. For example, in the above embodiment, a butterfly valve 10 is shown as being composed of a plurality of divided parts, but the present invention is not limited to this and the fluid control element may be composed as a single unit. [Explanation of Symbols]

[0116] 1 Fluid tube 2 cabinets 2a Branching section (opening) 2b Flange (locking part) 4. Working valve 5 cutting machine 6-valve introduction machine 7. Jack (spacer) 8. Drive mechanism (drive unit, insertion machine, second segment) 10 Butterfly valve (fluid control) 11 Partition wall (main body, first divided part) 12. Opening / closing shaft (main body, first segmented part) 13 Valve body (main body, first segmented body) 14. Upper lid (lid body, second segment) 20 cabinets 41 Valve body (first segment) 41c Valve seat part 42. Valve body (second division) 43. Valve lid (second segment) 44 Valve stem (second segment) 51 Mounting flange cylinder (cylindrical body) 52 Cutters (First division) 53 Lid (First division) 54 Adapter (First segment) 55 Fixing jig (locking part) 61. Cylindrical member (tubular body) 62 Locking member (locking part) 63 Mounting flange cylinder (cylindrical body) 64 Valve suspension fittings 65 Lid 66 adapters 81,81' Shaft member (drive shaft) 86 Case section (case) 200 cabinets 200a Branch section (opening) 400 work valve 401 Valve body (first segment) 402 Work valve 402A, 402B Valve body (second segment) 403 Work valve 403A, 403B valve cover (second segment) 404A, 404B Valve stem (second segment) 410 Work valve 411A, 411B Half-split member 412 1st division body 413 Second division body 500 cutting machine 510 cutting machine

Claims

1. A method for assembling a control fluid installation device comprising a housing that is sealedly attached to a fluid pipe, a work valve attached to the opening of the housing and capable of opening and closing the inside of the housing, a cylindrical body attached to the work valve, a cutter for cutting the fluid pipe inside the housing, and a cutting machine having a drive unit for driving the cutter, wherein a control fluid for controlling the flow path of the fluid pipe is installed in a continuous flow state inside the housing after the fluid pipe has been cut using the cutting machine, by suspending the cutting machine and the control fluid in a space where there is no fluid inside the pipe, At least the cutting machine is composed of a plurality of divided parts, and after the housing is sealed and attached to the fluid tube, the cutter, which is the first divided part of the plurality of divided parts, and the drive unit, which is the remaining second divided part, are assembled. After the cutter is driven by the drive unit of the cutting machine to cut the fluid pipe inside the housing, the cutter is moved from inside the housing into the cylindrical body to close the work valve. The cylindrical body is removed from the work valve along with the drive unit and the cutter. A separate cylindrical body capable of retaining the fluid control fluid is attached to the work valve, The fluid control and the drive unit constituting the cutting machine are assembled, A method for assembling a fluid control device, characterized by opening the work valve and driving the fluid control fluid with the drive unit to install it inside the housing.

2. The method for assembling a fluid control device according to claim 1, characterized in that the fluid control device is composed of a plurality of divided parts, and the main body portion, which is a first divided part among the plurality of divided parts, and the lid portion, which is the remaining second divided part, are assembled inside the cylindrical body in which the fluid control device can be locked.

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