JP7068009B2 - Pipeline cutting method - Google Patents

Description

The present invention relates to a pipeline cutting method and a pipeline cutting device for cutting a pipeline member in a continuous flow state by a cutting means inside a housing that encloses the pipeline member in a hermetically sealed manner.

In the conventional pipeline cutting method, the center drill is advanced in the axial direction to penetrate the pipe wall of the pipeline member inside the housing for sealing the pipeline member such as a fluid pipe, and the center drill is used. After cutting with a hole saw that rotates around the center drill, the locking portion provided on the outer periphery of the center drill is extended in the outer radial direction, and the section of the pipeline member separated from the pipeline is locked by this locking portion. In some cases, the section is carried out of the housing.

The locking portion used in such a pipeline cutting method is provided so as to be hinged around a through hole penetrating the shaft body of the center drill, and is provided when cutting the pipeline member. By closing and rotating following the progress of the center drill, it passes through the perforation of the pipeline member, and when collecting the cut pipeline member, it follows the retreat of the center drill and opens and rotates by its own weight. As a result, the locking portion is locked to the perforated peripheral edge of the section, and the section is carried out of the housing (see, for example, Patent Document 1).

Jikkenhei 3-26417 (Page 10, Fig. 4)

However, as a pipeline member to be cut in the housing, a connection point between a plurality of fluid pipes and a connecting member having a deformed portion such as a joint ring, a short pipe, a reducer, etc. erected at the end of the pipe is provided. In the case of cutting, in Patent Document 1, as the center drill preceding the hole saw first penetrates the connecting member, the connecting member and the fluid pipe connected to the connecting member move relative to each other in the pipe axis direction. As a result, there is a problem that the cutting position of the fluid pipe by the hole saw that follows the center drill is displaced, and there is a possibility that the accurate position of the pipe line member cannot be cut as expected. In addition, the center drill or hole saw may be damaged due to vibration or the like, or the locking portion may come into contact with the pipe end and be damaged.

When cutting a pipeline member using a center drill and a hole saw in this way, the relative movement that occurs between the fluid pipe and the connecting member is allowed to move relative to a predetermined length in the axial direction, for example, in order to have earthquake resistance. In addition to the connection mode (push-on type, etc.) inserted in the state of being inserted, even if the connection mode (mechanical type, etc.) in which the fluid pipe and the connecting member are fastened with bolts, nuts, etc. The cause was corrosion and slack due to deterioration of the fastening member over time. That is, there is a possibility that the fluid pipe and the connecting member move relative to each other regardless of these connection modes.

The present invention has been made by paying attention to such a problem, and as a pipeline member to be cut in a housing, a connection point between a plurality of fluid pipes and a connection member is set at an accurate position as designed. It is an object of the present invention to provide a pipeline cutting method and a pipeline cutting device capable of cutting.

In order to solve the above-mentioned problems, the pipeline cutting method of the present invention is used.
Inside the housing that encloses the plurality of fluid pipes constituting the pipeline member and the connecting member connected over the plurality of fluid pipes in a sealed manner, around the center drill and the center drill penetrating the pipeline member. The pipeline member is cut in a continuous flow state by a cutting means provided with a rotating hole saw, and the cut section of the pipeline member is engaged by a locking portion extending in the outer radial direction of the center drill. It is a method of cutting a pipeline that is carried out to the outside of the housing.
After fixing the connecting member and at least one of the fluid pipes connected to the connecting member in the pipe axis direction by a fixing tool, the center drill is characterized in that it penetrates at least the connecting member.
According to this feature, even if the center drill of the cutting means is penetrated through the connecting member inside the housing for sealing the pipeline member, at least one fluid pipe and the connecting member are fixed. Since the relative movement between these pipeline members is prevented and the cutting position can be positioned by the center drill, the fluid pipes and connecting members can be placed in the exact position as designed by the hole saw that follows the center drill. Can be disconnected.

The connecting member and all the fluid pipes connected to the connecting member are fixed in the pipe axis direction by the fixing tool, and then the center drill penetrates at least the connecting member.
According to this feature, the connecting member and all the fluid pipes do not move in relative movement in the pipe axis direction, and the pipe line can be reliably cut at the position as designed.

After detecting the connection position between the fluid pipe and the connecting member, the center drill is characterized in that it penetrates at least the connecting member.
According to this feature, by detecting the connection position between the fluid pipe and the connecting member, a good position is adjusted so that the locking portion avoids the vicinity of the end face of the fluid pipe which may cause interference with these pipeline members. The center drill can be penetrated.

It is characterized in that the fixture is welded to the fluid pipe or the connecting member.
According to this feature, by welding the fixture to the fluid pipe or the connecting member, the fluid pipe and the connecting member can be easily and firmly fixed by the fixture.

The center drill is characterized in that the center drill penetrates the connecting member at a position where the locking portion extending in the outer diameter direction of the center drill is separated from the pipe ends of the plurality of fluid pipes in the pipe axis direction. ..
According to this feature, the locking portion of the center drill does not interfere with the end face of the fluid pipe, the pipe can be cut at an early stage, and the section can be reliably collected by the locking portion.

After fixing the engaging portion with which the locking portion engages on the outer surface of the connecting member, the center drill is characterized in that it penetrates the engaging portion and the connecting member.
According to this feature, the locking portion can be reliably engaged with the engaging portion by the center drill penetrating the engaging portion fixed to the connecting member in advance.

A pipeline cutting device used in the above-mentioned pipeline cutting method.
The housing that encloses the pipeline member in a sealed manner, the cutting means having the center drill and the hole saw provided with the locking portion, and the connecting member and at least one of the fluids connected to the connecting member. It is characterized in that it is composed of the fixing tool for fixing the pipe in the direction of the pipe axis.
According to this feature, even if the center drill of the cutting means penetrates the connecting member inside the housing for sealing the pipeline member, the fluid pipe and the connecting member are fixed by the fixing tool, and these pipes are fixed. Since the relative movement between the road members is prevented, the pipe can be reliably cut without the locking portion provided in the center drill interfering with the end face of the fluid pipe at the time of cutting.

It is a figure which shows the pipeline member and the fixed piece in Example 1, (a) is the AA sectional view of (b), (b) is the side sectional view. It is a front sectional view which shows the housing assembled to a pipeline member. It is a front sectional view which shows the cutter in the process of cutting a pipeline member in a housing. It is a front sectional view which shows the cutter which cut the pipeline member in the housing. It is a front sectional view which shows the cutter which collects a section of a pipeline member in a housing. It is a plan sectional view which shows the locking part in Example 1 provided in the center drill, (a) is the initial state of a lock pin, (b) is a rotating state of a lock pin, (c) is a section locking. It is a figure which shows the initial state of the lock pin. It is a front sectional view which shows the installation machine which installs a control fluid. It is a partial front sectional view which shows the control fluid installed in the pipeline member after cutting. (A) is an enlarged cross-sectional view showing a modification 1 of the fixture, (b) is a cross-sectional view showing a modification 2 of the fixture, and (c) is a cross-sectional view showing a modification 3 of the fixture. be. It is a figure which shows the locking part in the deformation example provided in the center drill, (a) is the natural state and BB sectional view of the locking ring, (b) is the elastic deformation state of the locking ring, (c). Is a diagram showing the natural state of the locking ring that locks the section. It is a front sectional view which shows the cutter which completed the cutting of the pipeline member to which the engaging portion was attached in a housing. It is a partial front sectional view which shows the situation which the inside of a pipeline member is detected by the detection means.

A mode for carrying out the pipeline cutting method and the pipeline cutting device according to the present invention will be described below based on examples.

The pipeline cutting method and the pipeline cutting device according to the embodiment will be described with reference to FIGS. 1 to 12. First, reference numeral 1 in FIG. 1 is a pipeline member cut by the pipeline cutting method and the pipeline cutting device of the present invention.

In the embodiment, as a method of cutting the pipeline, predetermined portions of the straight pipes 3 and 3 and the connecting member 4 as a plurality of fluid pipes constituting the existing pipeline member 1 are excised in the housing 5, and the excision thereof is performed. A series of flows until the control fluid 10 is installed at the location in a continuous flow state will be described with reference to FIGS. 1 to 8. The fluid in the pipeline member 1 is clean water in this embodiment, but may be, for example, industrial water, sewage, or a gas or a gas-liquid mixture of a gas and a liquid.

The pipeline member 1 of this embodiment is a ductile cast iron pipe, and as shown in FIGS. 1 and 2, the end faces 3b (pipe ends) of the end portions 3a in the pipe axis direction face each other and are spaced at predetermined intervals. A pair of straight pipes 3, 3 extending in the pipeline direction at separated arrangement positions, and a tubular joint ring connected in a sealed manner across the ends 3a, 3a of these straight pipes 3, 3 and extending in the pipeline direction. It is composed of a connecting member 4 including 20 and a connecting member 4. In this embodiment, the pipeline direction of the pipeline member 1 extends in a substantially horizontal direction, and the joint ring 20 is formed in a substantially linear shape and a substantially circular shape in a cross-sectional view. The pipeline member according to the present invention may be made of other metal such as cast iron or steel, or may be made of 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 an appropriate material may be coated on the inner peripheral surface of the pipeline member by powder coating.

Here, the connecting member constituting the pipeline member of the present invention is not limited to the one provided with the straight tubular joint ring 20 as in the present embodiment, and may be a member connected to the end of the fluid pipe, for example. The connecting member is a general term for a deformed pipe having various deformed portions such as a curved pipe portion, a branch portion, a T-shaped portion, a cross portion, a different diameter portion, a reducer, a short pipe portion, and a drainage portion. Further, the fluid pipe connected to the connecting member is not limited to the two fluid pipes connected to both ends of the joint wheel 20 as in the present embodiment, and for example, when the connecting member has a T-shaped portion, the present invention is concerned. It may be three fluid pipes connected to the T-shaped portion, or may be four fluid pipes connected to the cross portion, for example, when the connecting member has a cross portion.

The straight pipes 3 and 3 and the connecting member 4 of the present embodiment are connected by inserting the end portion 3a, which is the insertion portion of the straight pipes 3 and 3, into the joint ring 20 in a sealed manner. The mode of connection will be described in detail. Since the connection mode between the connecting member 4 and the straight pipes 3 and 3 connected to each end thereof is the same, only the connection between the connecting member 4 and one straight pipe 3 will be described, and the other will be described. Is omitted.

The connecting member 4 includes a joint ring 20 that is fitted on both ends of the straight pipes 3 and 3, a push ring 21 that is connected to each end of the joint ring 20 in the pipe axial direction, and an inner circumference of the joint ring 20. It is mainly composed of a seal member 22 interposed between the straight pipe 3 and the outer periphery of the straight pipes 3 and 3. An annular recess 20b is formed on the inner peripheral surface of the receiving portion of the joint ring 20, and a lock ring 23 that abuts or is close to the outer peripheral surface of the straight pipe 3 is disposed in the recess 20b. There is. Further, the inner peripheral surface outer of the recess 20b of the joint wheel 20 is formed as a tapered surface whose diameter gradually increases toward the end surface in the axial direction, and is between the tapered surface and the outer peripheral surface of the straight pipe 3. , A sealing member 22 as a sealing member is arranged. A backup ring is interposed between the lock ring 23 and the seal member 22 in the pipe axial direction.

Further, the push ring 21 (which may be divided in the circumferential direction) is fitted on the outer peripheral surface of the straight pipe 3 adjacent to the end surface of the joint wheel 20 in the axial direction. Further, the male screw portion of the fastening member 24 is penetrated through a plurality of through holes formed along the circumferential direction of the push ring 21, and is screwed into the female screw portion formed on the end face of the joint ring 20 and the fastening member. A nut is screwed into the male screw portion of 24 and fastened. By this fastening, the seal member 22 is pressed in the pipe axis direction by the push ring 21, and is sandwiched between the tapered surface of the joint ring 20 and the outer peripheral surface of the straight pipe 3 to exhibit high sealing performance. The joint wheel 20 of this embodiment is a so-called S type, and a split ring is interposed between the push ring 21 and the joint wheel 20.

Further, since a flange portion 3c having a diameter larger than that of the outer peripheral surface is formed at the tip of the straight pipe 3, the straight pipe 3 and the connecting member 4 are separated from each other due to an external force such as an earthquake or an unequal force. When the relative movement is made to, the lock ring 23 is sandwiched between the flange portion 3c and the inner side wall of the recess 20b of the joint ring 20, so that the straight pipe 3 and the connecting member 4 are prevented from being separated from each other. .. In other words, the straight pipe 3 and the connecting member 4 are prevented from disconnecting in a connected state having a seismic function that allows a certain degree of relative movement in the pipe axis direction.

Further, the mode of connection between the fluid pipe constituting the pipeline member of the present invention and the connecting member is not limited to the one composed of the joint ring 20 and the push ring 21 as in the present embodiment, and various as will be described later. It may be connected by the aspect of.

The pipeline cutting method according to the present invention will be described below in order of process. First, the fixing process of the fixture will be described. As shown in FIG. 1A, fixing that fixes the relative movement of the straight pipes 3 and 3 constituting the pipeline member 1 and the connecting member 4 in the pipe axis direction. Attach the fixing piece 30 as a tool. The fixing piece 30 of this embodiment is composed of a plate-shaped member made of a substantially rectangular metal material, and one side surface 30b thereof is in contact with or close to the outer end surface of the push ring 21 at a position in the pipe axis direction. The peripheral edge of the bottom surface 30c is used as the welded portion 30a and is welded to the outer peripheral surface of the straight pipe 3. Therefore, the straight pipe 3 to which the fixed piece 30 is welded is prevented from relatively moving in the direction of being over-inserted in the pipe axial direction with respect to the connecting member 4.

Further, as shown in FIG. 1 (b), the fixing pieces 30 of this embodiment are fixed at both ends of the connecting member 4 in the pipe axial direction, and each end is located at a plurality of locations in the circumferential direction of the straight pipe 3. In this embodiment, it is fixed at four places with an equal distribution of approximately 90 degrees).

By welding the fixing piece 30 to the straight pipes 3 and 3 in this way, the straight pipes 3 and 3 and the connecting member 4 can be easily and firmly fixed by the fixing piece 30. The fixed piece 30 is not limited to the one to be welded to the straight pipes 3 and 3, and may be welded to, for example, the joint wheel 20 or the push ring 21 constituting the connecting member 4.

The fixing location of the fixture is not limited to this embodiment, and may be fixed at at least one end portion in the pipe axis direction of the connecting member, or at least one location in the circumferential direction or at a plurality of locations of two or more locations. It may be fixed to equal or non-equal distribution. Further, the fixing method is not limited to the welding of this embodiment, and for example, the fixing tool may be fixed by using a fastening band that winds around the outer circumference of the straight pipe 3.

Further, the fixing step of the fixing tool may be at least before the cutting step described later, and for example, the fixing step may be before or after the housing assembling step described later. It doesn't matter.

Next, the process of assembling the housing will be described. As shown in FIG. 2, the housing constituting the pipeline cutting device with respect to the pipeline member 1 including the ends of the straight pipes 3 and 3 to which the fixing piece 30 is fixed and the connecting member 4 as described above. 5 is fitted on the outside in a sealed shape. The housing 5 has a plurality of divided structures, and in this embodiment, the housing main body 50 composed of the first divided body 51 constituting the upper side and the second divided body 52 constituting the lower side is moved. It is mainly composed of a pair of push wheels 54, 54 for prevention. The divided structure of the housing 5 is not limited to this embodiment, and may be divided in the horizontal direction, and the number of divisions may be divided into a predetermined number of 3 or more. Further, the joining between the divided housings is a welding joining in this embodiment, but the joining is not limited to this, and for example, a fastening member such as a bolt or a nut may be used for joining via packing.

The assembly position of the housing 5 in the pipe axial direction with respect to the pipe line member 1 including the ends of the straight pipes 3 and 3 and the connecting member 4 is the central portion 20c of the joint wheel 20, that is, in the pipe axial direction inside the joint wheel 20. It is preferable that the central portion of the separated portion between the straight pipes 3 and 3 that are separated from each other is arranged substantially in the center of the housing 5.

As shown in FIG. 2, the housing body 50 extends in the pipeline direction so as to surround the ends of the straight pipes 3 and 3 and the connecting member 4, and extends in the vertical direction and opens upward. The opening 50c is formed. A pair of push rings 54, 54, which are divided into upper and lower parts to prevent detachment, are hermetically attached to both ends of the housing body 50 in the pipeline direction. The division direction and the number of divisions of the push ring 54 are not limited to this embodiment.

Next, the cutting process of the pipeline member will be described. As shown in FIG. 3, a work valve 6 provided with a valve body 6a capable of closing the opening 50c is attached to a mounting flange 50f provided at the upper end of the opening 50c of the housing body 50, and the work valve 6 is attached. A cutting machine 7 as a cutting means is installed above the. The pipeline cutting device of the present invention is mainly composed of a housing 5, a cutting machine 7, and a fixed piece 30.

The cutting machine 7 drives the mounting flange cylinder 71, the cutter 72 for cutting the pipeline member 1, and the cutter 72 for rotating the cutter 72 in the mounting flange cylinder 71 and for advancing and retracting the cutter 72 in the vertical direction. It is mainly composed of a mechanism 78 and. The cutter 72 is composed of a hole saw 73 having a cutting blade at its tip along the circumferential direction, and a center drill 74 arranged coaxially with the rotation axis of the hole saw 73 and protruding toward the tip of the cutting blade. The hole saw 73 of the cutter 72 is formed in a circular shape concentric with the opening 50c of the center drill 74 and the housing 5, is inserted into the housing 5 through the opening 50c, and is located near the bottom of the housing body 50. It is possible to proceed to.

Further, the center drill 74 is composed of a substantially columnar shaft body 75 and a drill portion 76 fixed to the tip end side of the shaft body 75 and having a tip drill 77. The shaft body 75 and the drill portion 76 have a peripheral wall having substantially the same diameter, and a drill C having substantially the same diameter or slightly larger diameter as the peripheral wall is formed in the joint ring 20 to be drilled by the tip drill 77. Will be done. The shaft body 75 of the center drill 74 and the drill portion 76 may be integrated or may be configured as separate members.

Further, the shaft body 75 and the drill portion 76 of the center drill 74 are provided with a lock pin 40 as a locking portion. A plurality of lock pins 40 are provided in the axial direction of the center drill 74, and each of them is rotatably provided. In this embodiment, the lock pins 40 are provided at nine locations separated from each other in the axial direction of the shaft body 75 and at one location on the drill portion 76, but the locations where the lock pins 40 are provided are not limited to this embodiment and are centered. The drill 74 may be provided at at least one place or at a plurality of places of two or more places.

Further, since these plurality of lock pins 40 are provided on the shaft body 75 or the drill portion 76 in the same manner, only one lock pin 40 provided on the shaft body 75 will be described below.

As shown in FIGS. 6 (a) to 6 (c), the shaft body 75 has notches 75a and 75a having a shape in which a part of a substantially columnar peripheral wall is cut out in a flat shape so as to oppose the radial direction. Is provided, and a step portion 75b facing upward is formed by the notch portion 75a and the peripheral wall. Further, a through hole 75c is formed which penetrates the lower portion of the notch 75a in the radial direction.

The lock pin 40 has a substantially U-shape including a central portion 41 that penetrates the through hole 75c in a loose fit and side portions 42 and 42 that are bent at both ends of the central portion 41 that protrudes from the through hole 75c. The side portions 42 and 42 of the lock pin 40 are rotatably provided around the central portion 41 penetrating the through hole 75c, upward and outward.

More specifically, as shown in FIG. 6A, the initial position of the lock pin 40 is such that the side portions 42 and 42 are laterally placed on the step portion 75b due to its own weight and the centrifugal force generated by the rotation of the center drill 74. By being placed, it is a position arranged in a substantially U-shape in a plan view. At the initial position of the lock pin 40, the tip portion 43 of the side portion 42 protrudes in the outer diameter direction from the peripheral wall of the shaft body 75, and can be locked to the peripheral edge of the perforation C formed in the joint ring 20 described later. (See FIG. 6 (c)).

Further, as shown in FIG. 6B, the rotation position of the lock pin 40 is such that the tip portion 43 of the side portion 42 comes into contact with the peripheral edge of the perforation C formed in the joint ring 20 described later. 40 is a position rotated about 90 degrees around the axis of the central portion 41 from the initial position, and the side portions 42 and 42 are vertically mounted on the step portion 75b, so that the side portions are substantially U-shaped. It is a position arranged in a shape. At the rotation position of the lock pin 40, not all of the side portion 42 including the tip portion 43 protrudes in the outer diameter direction from the peripheral wall of the shaft body 75, that is, the lock pin 40 is cut from the peripheral wall of the shaft body 75. It is housed in the notched portion 75a.

Next, as a specific cutting step of the pipeline member 1 by the cutting machine 7, first, the valve body 6a inside the working valve 6 is retracted to open the opening 50c of the housing 5, and then FIGS. 3 and 3 and FIGS. As shown in 4, the cutter 72 of the cutting machine 7, that is, the center drill 74 and the hole saw 73 are rotated and advanced downward to cut the pipeline member 1 in a continuous flow state.

The cutting process of the first embodiment will be described in detail. As shown in FIG. 3, first, the tip drill 77 of the center drill 74 leading in the traveling direction of the hole saw 73 rotates while the joint ring 20 of the connecting member 4 is rotated. A drilling C is drilled through the wall body of the central portion 20c, and then the drill portion 76 base end side and the shaft body 75 of the center drill 74 sequentially pass through the drilling C. At the time of this passage, each lock pin 40 temporarily rotates from the initial position to the rotation position by coming into contact with the peripheral edge of the drilling C, and after passing through the drilling C, behaves so as to return to the initial position again.

When the perforation C is formed, an external force or vibration is applied to the connecting member 4 by the rotating center drill 74, but the connecting member 4 and the straight pipes 3 and 3 are fixed by the fixing piece 30. The connecting member 4 is prevented from moving relative to the straight pipes 3 and 3. Therefore, the hole saw 73 that follows the center drill 74 can cut the pipe walls of the straight pipes 3 and 3 at the desired position in the pipe axis direction without causing a positional deviation.

In this embodiment, the center drill 74 constituting the cutter 72 is used to drill a hole C in the joint ring 20 of the connecting member 4, and the hole saw 73 is used to form a straight pipe outside of both ends of the connecting member 4. The pipe walls of 3 and 3 are cut at once by the progress of the hole saw 73. At this time, the position of the center drill 74 is preferably a position avoiding the pipe end portion of the straight pipes 3 and 3 and the interposition member between the straight pipes 3 and 3 such as the seal member 22 and the connecting member 4, and further, the initial position. The optimum position is where the tip 43 of the side portion 42 of the lock pin 40 is separated from the pipe ends of the straight pipes 3 and 3.

Further, since a drain (not shown) capable of discharging the fluid to the outside is attached to the bottom of the housing body 50 together with a valve that can be opened and closed, it is generated when the pipeline member 1 is cut by the cutter 72. Chips can be discharged to the outside together with the fluid. This drain can also be used as a bypass for filling water during fluid control operation.

When the pipeline member 1 is cut by the cutter 72, the section 2 composed of the connecting member 4 separated from the pipeline member 1 and the pipe ends of the straight pipes 3 and 3 connected to the connecting member 4 is a hole saw 73. It is in a state of being penetrated and held by the center drill 74 inside. Then, as shown in FIG. 5, when the cutter 72 is pulled up inside the mounting flange cylinder 71, the lower peripheral edge of the drilling C formed in the joint ring 20 is the tip portion 43 of the side portion 42 of the lock pin 40 at the initial position. (See FIG. 6 (c)), the section 2 in the hole saw 73 is pulled up following the center drill 74 and carried out of the housing 5.

In this way, the center drill 74 penetrates the connecting member 4 at a position where the lock pin 40 extending in the outer diameter direction of the center drill 74 is separated from the pipe ends of the plurality of straight pipes 3 and 3 in the pipe axis direction. As a result, the lock pin 40 of the center drill 74 does not interfere with the end faces 3b and 3b of the straight pipes 3 and 3, the pipe can be cut at an early stage, and the section 2 can be reliably recovered by the lock pin 40. ..

By closing the opening 50c of the housing 5 with the valve body 6a inside the work valve 6, the cutting work of the pipeline member 1 is completed. Further, although the straight pipes 3 and 3 left in the housing 5 after cutting the pipeline member 1 by the cutter 72 are separated from each other, they are integrally held in a state of being surrounded by the housing 5. Although not particularly shown, the cutting machine 7 is removed while the opening 50c of the housing 5 is closed by the valve body 6a inside the work valve 6.

Next, as shown in FIG. 7, the installation machine 8 is installed above the work valve 6 that closes the opening 50c of the housing body 50 of the housing 5. The installation machine 8 is mainly composed of a valve suspension fitting 82 for suspending and supporting the fluid control fluid 10, and a drive mechanism 83 for advancing and retracting the valve suspension bracket in the vertical direction. As shown in FIG. 8, the control fluid 10 of the present embodiment opens and closes a partition wall 11 having an opening, a valve body 13 for opening and closing the opening, an upper lid portion 12, and the valve body 13. It is a so-called butterfly valve mainly composed of a drive unit 18 and a partition wall 11, to which a first seal member S1 is attached from a lower end portion to both side portions, and to an upper lid portion 12 over an outer peripheral portion. An annular second seal member S2 is attached. The first seal member S1 and the second seal member S2 are made of elastic members such as rubber, elastomer, and resin containing NBR, SBR, and CR.

In the process of installing the fluid control fluid 10 by the installation machine 8, first, the valve body 6a inside the work valve 6 is retracted to open the opening 50c of the housing 5, and then the suspension is supported by the valve suspension fitting 82 of the installation machine 8. The control fluid 10 is advanced downward, and the control fluid 10 is inserted into a predetermined position in the housing 5.

On the inner wall surface of the housing body 50, side wall step portions 50g and 50g having a substantially U-shaped upper surface view protruding inward of the housing body 50 from other parts are formed so as to face each other. Therefore, when the control fluid 10 is inserted into the housing 5, both side portions of the partition wall 11 of the control fluid 10 are guided by the side wall step portions 50g and 50g, so that the insertion position of the control fluid 10 is displaced. Is prevented.

Further, on the inner wall surface of the bottom portion of the housing 5, a bottom wall step portion 50h continuous with the side wall step portions 50g and 50g is formed. Further, an annular step portion 50j continuous with the side wall step portions 50g and 50g is formed on the inner wall surface of the side portion on the opening 50c side of the housing 5. Therefore, when the control fluid 10 is inserted into the housing 5 at a predetermined depth, the first seal member S1 attached from the lower end portion to both side portions of the partition wall 11 of the control fluid 10 is attached to the bottom wall step portion 50h and the bottom wall step portion 50h. The annular second seal member S2, which is press-fitted into the side wall step portions 50g and 50g in a sealed manner and is attached over the outer peripheral portion of the upper lid portion 12 of the fluid control fluid 10, is pressed against the annular step portion 50j of the housing 5. Ru.

In this way, the control fluid 10 is installed in the housing 5 so as to partition between the divided straight pipes 3 and 3, so that the fluid leaks between the peripheral edge of the control fluid 10 and the housing 5. Is prevented, and the flow path in the housing 5 is opened or blocked by opening and closing the valve body 13 of the fluid control fluid 10.

Next, as shown in FIG. 8, a plurality of radial presser screws N provided in the circumferential direction of the opening 50c of the housing 5 are advanced in the inner diameter direction of the opening 50c. As a result, the presser screw N is locked so as to press the upper lid portion 12 of the control fluid 10 from above, and the control fluid 10 is prevented from coming out of the opening 50c of the housing 5.

In this way, the presser screw N presses the upper lid portion 12 of the fluid control fluid 10 from above, so that the installation machine 8 and the work valve 6 can be removed from the housing 5.

Next, the lid member 57 having an annular shape on the upper surface is fixed to the mounting flange 50f of the housing body 50 of the housing 5. The lid member 57, together with the presser screw N, prevents the fluid control fluid 10 from coming out of the opening 50c of the housing 5. This completes the installation of the fluid control fluid 10 in the housing 5. Needless to say, a lid is attached to all windows, penetrations, work holes, etc. in a sealed manner when cutting or installing a valve in a continuous flow state.

As described above, according to the pipeline cutting method of the present invention, the center drill 74 of the cutter 72 is attached to the joint ring 20 constituting the connecting member 4 inside the housing 5 that seals the pipeline member 1. Even if it penetrates, at least one straight pipe 3 and the joint wheel 20 are fixed, so that relative movement between these pipe line members 1 is prevented, and the cutting position can be positioned by the center drill 74. The hole saw 73 that follows the center drill 74 can cut the straight pipe 3 and the connecting member 4 at the exact position as designed.

In particular, the connecting member 4 and all the straight pipes 3 and 3 do not move in relative movement in the pipe axis direction, and the pipe line can be reliably cut at the position as designed. The connecting member 4 and at least one straight pipe 3 (fluid pipe) connected to the connecting member 4 may be fixed.

In the pipeline cutting method of the present embodiment described above, fixing pieces 30 and 30 are attached to the outer peripheral surfaces of the straight pipes 3 and 3 as a fixture for fixing the straight pipes 3 and 3 (fluid pipe) and the connecting member 4. The straight pipes 3 and 3 (fluid pipes) and the connecting member 4 are fixed by welding and sandwiching the connecting member 4 between the side surfaces 30b and 30b of the fixing pieces 30 and 30 in the pipe axis direction. However, the pipeline member may be fixed by the following method, for example.

For example, as shown in FIG. 9A, the fixing piece 31 in the first modification has a shape including an inner side surface 31b and a hook portion 31d connected to the side surface 31b and extended in the pipe axis direction. It is composed of a plate-shaped member made of a metal material, and the side surface 31b is in contact with or close to the outer end surface of the push ring 21, and the hook portion 31d is formed to bulge in the outer radial direction at the end of the joint ring 20. The straight pipe 3 to which the fixed piece 31 is welded is connected by welding the peripheral edge of the bottom surface thereof to the outer peripheral surface of the straight pipe 3 as a welded portion 31a at a position in the pipe axial direction that engages with the flange portion 20d. Relative movement in the direction of over-insertion in the pipe axis direction and the direction of detachment with respect to the member 4 is prevented.

Further, for example, as shown in FIG. 9B, the fixture 32 in the modification 2 has a structure divided in the circumferential direction and has a main body portion 32a that is annularly fitted to the straight pipes 3'and 3'. The claw member 32c housed in the recess 32b formed on the inner peripheral side of the main body 32a and locked to the outer peripheral surfaces of the straight pipes 3'and 3', and the claw member 32c screwed into the main body 32a in the inner diameter direction. It is composed of a pressing bolt 32d for pressing and a fastening member 32f for fastening the main body portion 32a to the joint ring 25 and the push ring 26 which are connecting members. The fastening member 32f includes a bolt inserted into the insertion hole 25e of the joint ring 25, the insertion hole 26e of the push ring 26, and the insertion hole 32e of the main body portion 32a, and a nut screwed into the bolt.

In this modification 2, as a connection mode between the fluid pipe and the connecting member, the insertion portion of the straight pipe 3'(fluid pipe) is inserted into the inside of the joint ring 25 constituting the connecting member, and this A mode (so-called K-shape) in which the push ring 26 externally fitted to the straight pipe 3'and constituting the connecting member is connected to the joint ring 25 via the seal member 22 is shown, and is directly inside the joint ring 25. Since the end surface 3b'of the tube 3'has a back end surface 25c to which it abuts, the relative movement of the straight tube 3'in the direction of over-insertion in the pipe axis direction with respect to the joint ring 25 may be prevented.

According to the fixture 32 having such a configuration, when an external force acts on the joint ring 25 (connecting member) in a direction in which the straight pipe 3'disengages in the pipe axial direction, the outer peripheral surface of the straight pipe 3'is locked. The claw member 32c tilts in the recess 32b of the main body portion 32a supported by the joint ring 25 by the fastening member 32f as the straight pipe 3'moves in the pipe axis direction, and the claw member 32c tilts in the recess 32b of the straight pipe 3. By further biting into the outer peripheral surface of the', the relative movement of the straight pipe 3'in the direction of detachment from the joint wheel 25 in the pipe axis direction is prevented. By providing the fixing tool 32 having such a configuration at both ends of the joint wheel 25, the relative movement of the joint wheel 25 with respect to the straight pipe 3'is prevented.

Further, for example, as shown in FIG. 9 (c), the fixture 33 in the modified example 3 has a circumferentially divided structure and has a main body portion 33a that is annularly fitted to the straight pipes 3'and 3'. The claw member 33c housed in the recess 33b formed on the inner peripheral side of the main body 33a and locked to the outer peripheral surfaces of the straight pipes 3'and 3', and the claw member 33c screwed into the main body 33a in the inner diameter direction. A hook having a pressing bolt 33d to be pressed and a hook portion having a structure divided in the circumferential direction and externally fitted to the end portion of the joint ring 25 and engaging with the flange portion 25b formed at the end portion of the joint ring 25. It is composed of a member 33f and a fastening member 33e for fastening the hook member 33f and the main body portion 33a.

In this modification 3, the joint ring 25 and the push ring 26 are fastened by the fastening member 27, and the connection mode between the fluid pipe and the connecting member is the same as that of the above-mentioned modification 2, so that the straight pipe is used. Relative movement in the direction in which 3'is over-inserted in the pipe axis direction with respect to the joint wheel 25 is prevented.

According to the fixture 33 having such a configuration, when an external force acts on the straight pipe 3'in the direction of disconnection from the joint ring 25 (connecting member) in the pipe axis direction, the hook portion of the hook member 33f is subjected to the joint ring 25. The claw member 33c, which engages with the flange portion 25b of the straight pipe 3'and locks the outer peripheral surface of the straight pipe 3', is moved through the hook member 33f and the fastening member 33e as the straight pipe 3'moves in the pipe axis direction. The straight pipe 3'is tilted in the recess 33b of the main body portion 33a supported by the 25, and the claw member 33c further bites into the outer peripheral surface of the straight pipe 3', so that the straight pipe 3'detaches from the joint ring 25 in the pipe axial direction. Relative movement in the direction of movement is prevented. By providing the fixing tool 33 having such a configuration at both ends of the joint wheel 25, the relative movement of the joint wheel 25 with respect to the straight pipe 3'is prevented.

Next, a modified example of the locking portion provided in the center drill 74 according to the present invention will be described. As shown in FIG. 10, the center drill 74 is provided with a locking ring 45 as a locking portion in the axial direction thereof so that the diameter can be reduced. In this modification, the locking ring 45 is similarly provided at a plurality of locations apart from each other in the axial direction of the shaft body 75 and the drill portion 76, but only the locking ring 45 provided on the drill portion 76 is shown below. explain.

As shown in FIG. 10A, the drill portion 76 is provided with a reduced diameter portion 76c having a shape in which a part of a substantially columnar peripheral wall is radially reduced in diameter, and the reduced diameter portion 76c and the peripheral wall are provided. A step portion 76d facing upward is formed by the above.

The locking ring 45 is loosely fitted to the reduced diameter portion 76c, is formed in a substantially C-shaped ring shape in a plan view, and has elasticity that can be expanded and contracted in the radial direction. Further, the outer peripheral surface 45a of the locking ring 45 is formed in a tapered shape whose diameter is gradually increased from the lower end to the upper end.

More specifically, as shown in FIG. 10A, in the natural state of the locking ring 45, that is, in the inelastic deformation state, the lower end of the outer peripheral surface 45a is formed to have substantially the same diameter as the peripheral wall of the drill portion 76 or a slightly smaller diameter. At the same time, the upper end of the outer peripheral surface 45a is formed so as to protrude with a diameter larger than that of the peripheral wall of the drill portion 76. Therefore, in the natural state of the locking ring 45, the upper surface 45b connected to the upper end of the outer peripheral surface 45a can be locked to the peripheral edge of the perforation C formed in the joint ring 20 (see FIG. 10C).

Further, as shown in FIG. 10B, in the elastically deformed state of the locking ring 45, the upper end of the outer peripheral surface 45a is reduced in diameter to substantially the same diameter as the peripheral wall of the drill portion 76. That is, in the elastically deformed state of the locking ring 45, the entire locking ring 45 does not protrude in the outer diameter direction from the peripheral wall of the drill portion 76, but is housed in the reduced diameter portion 76c reduced in diameter from this peripheral wall. There is.

A cutting step of cutting the pipeline member 1 in a continuous flow state by moving the center drill 74 and the hole saw 73 provided with the locking ring 45 according to the present modification downward while rotating them will be described. The same description as in Example 1 described above will be omitted.

First, the tip drill 77 of the center drill 74 that precedes the hole saw 73 penetrates the wall body of the central portion 20c of the joint wheel 20 to drill a hole C while rotating, and then the drill portion 76 base end side of the center drill 74. And the shaft body 75 sequentially passes through this drilling C. At the time of this passage, as shown in FIG. 10B, the outer peripheral surface 45a of the locking ring 45 comes into contact with the inner peripheral surface of the drilling C, so that the diameter of the locking ring 45 is gradually reduced from the natural state and the elastic deformation state is entered. Then, as shown in FIG. 10 (c), it behaves so as to return to the natural state again after passing through the perforation C.

When the pipeline member 1 is cut by the cutter 72, the section 2 composed of the connecting member 4 separated from the pipeline member 1 and the pipe ends of the straight pipes 3 and 3 connected to the connecting member 4 is a hole saw 73. It is in a state of being penetrated and held by the center drill 74 inside. Then, when the cutter 72 is pulled up inside the mounting flange cylinder 71, the lower peripheral edge of the perforation C formed in the joint wheel 20 is locked to the upper surface 45b of the locking ring 45 in a natural state, so that the inside of the hole saw 73. Section 2 is pulled up following the center drill 74 and carried out of the housing 5.

Further, with respect to the pipeline cutting method of this embodiment, by adding the attachment step of the engaging portion described later, the section 2 separated from the pipeline member 1 by the above-mentioned cutting step can be reliably recovered.

Explaining the mounting process of the engaging portion, before the cutting step by the cutter 72 described above, the fixing piece 30 (fixing tool) for fixing the straight pipes 3 and 3 (fluid pipe) and the connecting member 4 is attached, and the fixing piece 30 (fixing tool) is attached. The engaging portion 60 for collecting the section 2 separated from the pipeline member 1 after the cutting step is fixed in advance at a position on the outer periphery of the joint ring 20 through which the center drill 74 penetrates. The engaging portion 60 has an insertion hole 60a penetrating in the vertical direction in the upper end wall 60b of the substantially cylindrical cylinder body portion 60c, and the lower end portion of the cylinder body portion 60c is open to match the axis of the center drill 74. At the upper end position of the joint wheel 20 that coincides with the axis of the insertion hole 60a, the peripheral edge of the lower end of the cylinder body portion 60c is fixed by welding as the welding portion 60d. The fixing of the engaging portion 60 is not limited to welding, and for example, a fastening band that winds around the outer circumference of the joint wheel 20 may be used, or a split type clamp may be assembled with bolts and nuts. Further, the engaging portion is not necessarily limited to the one having the insertion hole 60a in advance, and the insertion hole 60a may be bored by the center drill 74.

The insertion hole 60a of the engaging portion 60 has a slightly larger diameter than the center drill 74 and is formed to have a smaller diameter than the tip portion 43 of the side portion 42 of the lock pin 40 at the above-mentioned initial position. However, the insertion hole 60a may be formed to have a diameter smaller than that of the center drill 74 so as to be drilled as a drill pilot.

The cutting process after the mounting process of the engaging portion will be described in detail. As shown in FIG. 11, the tip drill 77 of the center drill 74 preceding the hole saw 73 first fixes the joint wheel 20 in advance while rotating. After being inserted into the insertion hole 60a of the joint portion 60, a hole C is drilled through the wall body of the central portion 20c of the joint wheel 20, and then the drill portion 76 base end side and the shaft body 75 of the center drill 74 are formed. It passes through the drilling C in sequence. At the time of this passage, each lock pin 40 rotates from the initial position to the rotation position by contacting the peripheral edge of the insertion hole 60a of the engaging portion 60, and returns to the initial position again after passing through the insertion hole 60a. Behaves to.

Further, the lock pin 40 rotates from the initial position to the rotation position by coming into contact with the peripheral edge of the perforation C, and behaves so as to return to the initial position again after passing through the perforation C, as in the first embodiment. As described above, since the axis of the center drill 74 and the axis of the insertion hole 60a of the engaging portion 60 coincide with each other and the insertion hole 60a has a larger diameter than the center drill 74, the center drill 74 has a larger diameter. The peripheral wall of the drill portion 76 and the shaft body 75 passes through the insertion hole 60a without touching the peripheral edge of the insertion hole 60a.

When the pipeline member 1 is cut by the cutter 72, the section 2 composed of the connecting member 4 separated from the pipeline member 1 and the pipe ends of the straight pipes 3 and 3 connected to the connecting member 4 is a hole saw 73. It is in a state of being penetrated and held by the center drill 74 inside. Then, when the cutter 72 is pulled up inside the mounting flange cylinder 71, the lower peripheral edge of the insertion hole 60a of the engaging portion 60 fixed to the joint wheel 25 and / or the lower peripheral edge of the perforation C formed in the joint wheel 20. Is locked to the tip 43 of the side portion 42 of the lock pin 40 at the initial position, so that the section 2 in the hole saw 73 is pulled up following the center drill 74 and carried out to the outside of the housing 5. ..

In particular, in the second embodiment, as shown in FIG. 11, for example, the center drill 74 is installed at an interference position where the peripheral wall of the shaft body 75 and the end surface 3b of the straight pipe 3 come into contact with each other, so that a plurality of locks are locked. Even if there is a risk that the lower lock pin 40 of the pins 40 may interfere with the end surface 3b of the straight pipe 3 and cause damage, the engaging portion 60 is fixed to the joint wheel 20 in advance before the cutting step. Therefore, the lower peripheral edge of the insertion hole 60a of the engaging portion 60 is locked to the upper lock pin 40, so that the section 2 is surely pulled up following the center drill 74 and is pulled up to the outside of the housing 5. Will be carried out to.

The above-mentioned engaging portion mounting step may be at least before the cutting step, and for example, the engaging portion mounting step may be before or after the fixing step of the fixture. It doesn't matter. Further, the mounting step of the engaging portion may be a stage before or after the mounting step of the housing.

Further, regarding the pipeline cutting method of this embodiment, by adding a detection step by a detection means described later, after detecting the connection position between the straight pipes 3 and 3 (fluid pipe) and the connecting member 4, the above-mentioned cutting step is performed. It can be performed.

Explaining the detection process, first, a branch portion 92 is provided at a predetermined position of the pipeline member 1 located in the vicinity of the straight pipes 3 and 3 and the connecting member 4. A repair valve 93 that opens and closes the branch portion 92 is connected to the upper part of the branch portion 92, and the camera 94a that captures the inside of the pipeline member 1 as described later is in a continuous flow state with the repair valve 93 in a closed state. A pipe detection device 94 as a detection means that can be inserted into the pipe member 1 is attached. Not only when the branch portion 92 is integrally provided on the pipeline member 1, a housing (not shown) is provided in a sealed shape at a predetermined position of the pipeline member 1, and a valve is connected to the branch portion of the housing. The configuration may be such that the insertion port of the camera 94a is perforated in a continuous flow state.

Next, with the repair valve 93 in the open state, the insertion rod 98 is inserted into the inside of the pipeline member 1 along the branch portion 92 by the insertion machine 95. At the tip of the insertion rod 98, an insertion guide 97 that guides the camera 94a inserted into the inside of the pipeline member 1 via the branch portion 92 so as to smoothly head in a predetermined pipe axis direction is arranged.

The in-pipe detection device 94 includes a camera 94a inserted inside the conduit member 1, a camera cable 94b whose one end is connected to the camera 94a and whose other end is a linear body extending to the outside of the conduit member 1. It further includes a monitor 94d for displaying the image of the camera. The camera cable 94b is preferably coated with a resin or the like and has flexibility and rigidity and slidability.

The camera 94a includes a camera head, moves inside the pipeline member 1 by inserting the camera cable 94b from the outside, and ends faces 3b of the straight pipes 3 and 3 externally fitted to the joint wheel 20 constituting the connecting member 4. In addition to visually recognizing the position in the pipe axis direction, the image visually recognized by the camera 94a is displayed on the monitor 94d via the camera cable 94b by visually recognizing what has accumulated as impurities on the inner wall of the pipe. .. At the upper end of the inserter 95, a measuring instrument 96 for measuring the feed dimension of the camera cable 94b is provided.

In the pipe detection device 94 described above, the relative position of the joint ring 20 and the straight pipes 3 and 3 in the pipe line member 1 in the pipe axis direction, or the separation distance between the end faces 3b and 3b of the straight pipes 3 and 3 or The distance between the peripheral surfaces of the joint wheel 20 and the straight pipes 3 and 3 and the state of the inside of the pipe such as inclusions can be confirmed from the outside of the pipe line member 1.

In this way, by detecting the connection position between the straight pipes 3 and 3 and the connecting member 4, the lock pin 40 avoids the vicinity of the end surface 3b of the straight pipe 3 which may cause interference with these pipe members 1. The center drill 74 can be penetrated by adjusting the appropriate position.

Further, when it is detected by the above-mentioned detection step that the actual connection position between the joint wheel 20 and the straight pipes 3 and 3 is different from the design connection position and is displaced in the pipe axis direction, for example, this position. By attaching the housing 5 to the straight pipes 3 and 3 located in the direction of the pipe axis to eliminate the deviation, the center drill 74 is arranged according to the actual connection position between the joint wheel 20 and the straight pipes 3 and 3. Or, if the mounting position of the cutting means with respect to the housing 5 is variable, by mounting the cutting means at the optimum position of the housing 5, the joint wheel 20 and the straight pipes 3 and 3 can be actually attached. The center drill 74 can be arranged according to the connection position.

Further, the above-mentioned detection step may be at least before the cutting step, and for example, the detection step may be at least before or after the fixing step of the fixture. Further, the detection step may be a stage before or after the mounting process of the housing.

The detection means used in the detection step is not necessarily limited to the one using the in-pipe detection device 94 provided with the camera 94a inserted inside the conduit member 1 to take an image. For example, the detection means may be provided with a pipe thickness measuring instrument, a device using ultrasonic waves such as a sonar, a non-destructive inspection device such as X-rays, or the like, and the pipe member does not enter the inside of the pipe member 1. The relative position of the joint ring 20 constituting the connecting member 4 and the straight pipes 3 and 3 in the pipe axis direction, and the separation distance between the end faces 3b and 3b of the straight pipes 3 and 3, which are in contact with or not in contact with the outer surface of 1. Alternatively, the distance between the peripheral surfaces of the joint wheel 20 and the straight pipes 3 and 3 and the state of the inside of the pipe such as inclusions may be detected from the outside of the pipe line member 1.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions that do not deviate from the gist of the present invention are included in the present invention. Will be.

For example, in the above embodiment, the center drill 74 has only the joint ring 20 constituting the connecting member 4, that is, the separated portion between the end faces 3b and 3b of the straight pipes 3 and 3 (fluid pipe) externally fitted to the joint wheel 20. Although it penetrates, the present invention is not limited to this, and for example, the center drill 74 may penetrate a portion where the connecting member and the fluid pipe overlap in the pipe axis direction. At this time, it is preferable that the center drill 74 is arranged so that at least half of the center drill 74 penetrates the fluid pipe, so that the locking portion of the center drill 74 can be arranged with the end surface of the fluid pipe. Interference can be suppressed.

For example, in the above embodiment, the embodiment in which the butterfly valve is used as the control fluid 10 is exemplified, but the present invention is not limited to this as long as it controls the fluid of the pipeline member 1, for example, the control fluid is a partition. It may be a valve, a butterfly valve, a switching valve, a plug, or the like.

Further, for example, in the above embodiment, the fluid pipes cut by the cutter 72 are all straight pipes 3 and 3, but the present invention is not limited to this, and the fluid pipe is, for example, one of a plurality of fluid pipes connected to a connecting member. Part or all of it may be another variant tube such as a T-shaped tube, a curved tube, a reducer, a cross tube, or the like. Further, the above-mentioned deformed tube may have a connection structure such as a so-called NS type, A type, T type, SII type, or GX type.

1 Pipeline member 2 Section 3 Straight pipe (fluid pipe)
3b End face (tube end)
4 Connection member 5 Housing 7 Cutting machine (cutting means)
8 Installation machine 10 Control fluid 20 Joint wheel 21 Push ring 22 Seal member 25 Joint wheel 26 Push ring 30 Fixture (fixture)
31 Fixture (fixture)
32 Fixture 33 Fixture 40 Lock pin (locking part)
45 Locking ring (locking part)
60 Engagement part 60a Insertion hole 72 Cutter 73 Hole saw 74 Center drill 75 Shaft body 76 Drill part 77 Tip drill 94a Camera 94 In-pipe detection device

Claims (5)

Inside the housing that encloses the plurality of fluid pipes constituting the pipeline member and the connecting member connected over the plurality of fluid pipes in a sealed manner, around the center drill and the center drill penetrating the pipeline member. The pipeline member is cut in a continuous flow state by a cutting means provided with a rotating hole saw, and the cut section of the pipeline member is engaged by a locking portion extending in the outer radial direction of the center drill. It is a method of cutting a pipeline that is carried out to the outside of the housing.
After fixing the connecting member and at least one of the fluid pipes connected to the connecting member in the pipe axis direction by a fixing tool, the locking portion of the center drill is a pipe from the pipe end of the plurality of fluid pipes. A method for cutting a pipeline, wherein the center drill penetrates the connecting member at positions separated in the axial direction . The first aspect of the present invention is characterized in that, after fixing the connecting member and all the fluid pipes connected to the connecting member in the pipe axis direction by the fixing tool, the center drill penetrates the connecting member. The described pipeline cutting method. The pipeline cutting method according to claim 1 or 2, wherein the center drill penetrates the connecting member after detecting the connection position between the fluid pipe and the connecting member. The pipeline cutting method according to any one of claims 1 to 3, wherein the fixture is welded to the fluid pipe or the connecting member. Any of claims 1 to 4 , wherein the center drill penetrates the engaging portion and the connecting member after fixing the engaging portion with which the locking portion engages on the outer surface of the connecting member. The method of cutting the pipeline described in Crab.

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