JP5764384B2 - Cutting method of fluid pipe - Google Patents

Description

  The present invention relates to a fluid pipe cutting method for cutting a fluid pipe by advancing a cutter member formed in a cylindrical shape in a radial direction of the fluid pipe.

  As a conventional method for cutting a fluid pipe, a casing is watertightly attached to a predetermined location of an existing water pipe (fluid pipe), and a drilling cutter (cutter member) is advanced in the casing to remove the existing water pipe. Some have adjusted the flow path of the fluid which flows through the existing water pipe by cut | disconnecting and arrange | positioning a partition between the cut existing water pipes (for example, refer patent document 1).

Japanese Patent No. 4519580 (page 4, FIG. 9)

  However, in the fluid pipe cutting method described in Patent Document 1, since the existing water pipe (fluid pipe) is pressed toward the advancing direction of the drilling cutter (cutter member), the existing water pipe is cut. There is a problem that the fluid pipe in which the deformation stress is generated in the process gives an excessive load to the cutter member, and the cutter member may be damaged and the fluid pipe cannot be cut.

  The present invention has been made paying attention to such problems, and provides a fluid pipe cutting method capable of cutting a fluid pipe without applying a load to a cutter member due to deformation stress generated in the fluid pipe. For the purpose.

In order to solve the above-described problem, a fluid pipe cutting method of the present invention includes
A fluid pipe cutting method for cutting a fluid pipe by advancing a cutter member formed in a cylindrical shape in a radial direction of the fluid pipe,
After fixing the reinforcing member to the fluid pipe to be cut by the cutter member while avoiding the cutting portion of the cutter member, the cutter member remains so that the reinforcing member remains in the section cut by the cutter member. It is characterized by cutting the fluid pipe.
According to this feature, the reinforcing member is fixed to the fluid pipe while avoiding the cutting portion by the cutter member , and the section modulus of the fluid pipe is increased so that the reinforcing member remains in the section cut by the cutter member. Since large rigidity can be obtained, when the fluid pipe is cut by advancing the cutter member, it is possible to support the load of the portion cut by the cutter member of the fluid pipe and the deformation stress accompanying the cutting. The deformation of the fluid pipe accompanying the progress of the fluid pipe in the radial direction can be suppressed, and the fluid pipe can be cut without applying a large load to the cutter member.

The fluid pipe cutting method of the present invention comprises:
The cutter member is characterized in that disconnecting the fluid conduit by proceeding toward the radial direction of the fluid pipe while rotating about the central axis of the cutter member.
According to this feature, since the cutter member cuts the fluid tube while rotating, even if the rotational moment is consuming deformation stress is generated in the slice portion to be cut, since the rotation moment can be alleviated by the reinforcing member, sections The fluid pipe can be accurately cut with the deformation of the portion suppressed.

The fluid pipe cutting method of the present invention comprises:
The reinforcing member has a rib that protrudes in the outer diameter direction of the fluid pipe and extends in the circumferential direction.
According to this feature, the rib can be cut while being supported by the fluid pipe except the slice portion while suppressing deformation due to the load of the slice portion and deformation stress associated with cutting by the rib.

The fluid pipe cutting method of the present invention comprises:
The cutter member includes a center drill that penetrates the fluid pipe in the same axis as the center axis of the cutter member, and a plurality of ribs are formed so as to sandwich the center drill in the tube axis direction of the fluid pipe. It is characterized by that.
According to this feature, the deformation stress generated by the rotational moment generated in the section portion when the fluid member is cut while the cutter member rotates can be strongly suppressed by the plurality of ribs, and the center drill can Since the slice portion is supported while rotating while penetrating, the deformation of the slice portion due to the rotational moment generated in the slice portion can be suppressed together with the reinforcing member.

The fluid pipe cutting method of the present invention comprises:
The rib forms a drill guide for guiding the center drill toward the fluid pipe.
According to this feature, the center drill is guided by the drill guide while the strength of the reinforcing member is improved by the rib, so that the center drill is surely penetrated to a predetermined position of the section, and the cutter member cuts the fluid pipe. The cutting position can be accurately positioned.

1 is a partial cross-sectional view illustrating a cutting device in Embodiment 1. FIG. (A) is a side view which shows the section | slice part of the fluid pipe | tube which fixed the reinforcement member, (b) is AA sectional drawing in Fig.2 (a). It is a partial cross section figure which shows the state which connected the housing | casing and the storage case in the seal shape. It is a partial cross section figure which shows the state which cut | disconnected the fluid pipe | tube. It is a partial cross section figure which shows the state which collect | recovered the slice part of the fluid pipe | tube. It is a partial cross section figure which shows the state which removed the storage case from the housing | casing. It is a partial cross section figure which shows the state which installed the fluid control in the housing | casing. (A) is a side view which shows the slice part of the fluid pipe | tube which fixed the reinforcement member in Example 2, (b) is BB sectional drawing in Fig.8 (a). (A) is a side view showing a section of a fluid pipe to which a reinforcing member in Example 3 is fixed, and (b) is a CC cross-sectional view in FIG. 9 (a).

  A mode for carrying out a fluid pipe cutting method according to the present invention will be described below based on an example.

  A fluid pipe cutting method according to the first embodiment will be described with reference to FIGS. Hereinafter, the front side in FIG. 1 will be described as the front side (front side) of the cutting device.

  Reference numeral 1 in FIG. 1 is a fluid pipe 1 made of steel or the like that is buried in the ground and extends in a substantially horizontal direction in the present invention. In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe 1 is not necessarily limited to clean water, and may be, for example, industrial water, or a fluid in a gas or gas-liquid mixed state. It may be a fluid pipe through which.

  The fluid pipe 1 is attached with a cutting device 2 for cutting a predetermined portion of the fluid pipe 1 in an undisturbed water state. As shown in FIG. 1, the cutting device 2 includes a housing 3 that is directly attached to the fluid pipe 1 by welding, and is substantially orthogonal to the pipe axis direction of the fluid pipe 1 in order to cut a predetermined cutting portion of the fluid pipe 1. A cutter member 4 approaching in a substantially horizontal direction, a storage case 5 for storing the cutter member 4, and an advancing / retreating drive unit 6 capable of moving the cutter member 4 back and forth between the fluid pipe 1 and the storage case 5. , Mainly consists of.

  Of these, the housing 3 is a split T-shaped tube made up of two connecting members that can be divided in the radial direction of the fluid pipe 1, although not particularly illustrated, and after connecting the two connecting members, By welding in this manner, the casing 3 and the outer peripheral surface of the fluid pipe 1 are in close contact with each other. An opening / closing valve 7 for opening and closing the rightward opening of the housing 3 is provided on the right side of the housing 3 so as to be movable in the front-rear direction.

  The inner walls of the upper end portion and the lower end portion of the housing 3 are formed in a tapered shape that is inclined toward the fluid pipe 1 from the right side to the left side. A pair of guide pieces 3b (this embodiment) for guiding a control fluid 11 (to be described later) into the housing 3 against the fluid pressure of the fluid flowing in the fluid pipe 1 are provided at the front end portion and the rear end portion of these inner walls. Then, only the rear end side is shown).

  As shown in FIGS. 5 and 6, the storage case 5 is connected to the right end of the housing 3 in a watertight manner and communicates in the left-right direction with a cylindrical body 8, a case body 9 that opens toward the left, It is composed of The storage case 5 has a nesting structure in which the left and right width dimensions can be expanded and contracted by the cylindrical body 8 and the case main body 9, and the cylindrical body 8 and the case main body 9 are watertightly held by a packing (not shown). Yes.

  The cylindrical body 8 and the case main body 9 are connected to each other by a plurality of operation bolts and nuts (not shown) having bolts formed in the left-right width direction of the cutting device 2 via respective flanges. The cylindrical body 8 and the case main body 9 move the case main body 9 relative to the cylindrical body 8 in the left-right width direction by operating the auxiliary means including the operation bolt / nut and the hydraulic mechanism (not shown). It is possible.

  As shown in FIG. 4, the advance / retreat drive unit 6 is watertightly connected to the right end of the case body 9. From the left part of the advance / retreat drive unit 6, a shaft member 6 a extends horizontally toward the fluid pipe 1 in the case body 9. The advancing / retracting drive unit 6 can rotate the shaft member 6a around the axis by power such as hydraulic pressure or electric power, and the housing 3 and the case body 9 in which the fluid pipe 1 is disposed. It is possible to advance and retreat between. The advancing / retreating drive unit 6 is provided with a drain valve (not shown) capable of communicating the inside and the outside of the advancing / retreating drive unit 6 by being open and communicating with the inside of the case body 9 in a watertight manner. Yes.

  The cutter member 4 is formed to have a diameter longer than the diameter of the fluid pipe 1 in order to cut the fluid pipe 1. The cutter member 4 is fixed to the distal end portion of the shaft member 6a, and includes a center drill 4a that is coaxial with the shaft member 6a and extends toward the fluid pipe 1 side.

  As shown in FIG. 1, the cutter member 4 and the center drill 4a are formed to have a left-right width dimension that is longer than the left-right width dimension of the storage case 5 that is not extended. Therefore, as shown in FIG. 3, the housing 3 and the storage case 5 in a state in which the on-off valve 7 is released are connected in a watertight manner, so that both ends of the cutter member 4 and the center drill 4a are It is arranged closer to the outer peripheral surface of the fluid pipe 1 on the fluid pipe 1 side than the on-off valve 7.

  In addition, the section 1a of the fluid pipe 1 that is removed after being cut by the cutting apparatus 2 configured as described above includes the fluid pipe 1 that excludes the section 1a when the fluid pipe 1 is cut by the cutting apparatus 2. A reinforcing member 10 for reinforcing the strength of the fluid pipe 1 is fixed so as to support the load of the section 1a.

  As shown in FIGS. 2 (a) and 2 (b), the reinforcing member 10 is disposed between a pair of ribs 10b and 10b that are spaced apart from each other in the tube axis direction, and these ribs 10b and 10b. Rib 10c. Among these, the ribs 10 b and 10 b are each formed in a substantially semicircular arc shape when viewed from the front, and the inner diameter side of these ribs 10 b and 10 b is formed in a shape along the outer peripheral surface of the fluid pipe 1. Both the ribs 10b and 10b are welded to the fluid pipe 1 in a state where the inner diameter side is in contact with the outer peripheral surface of the fluid pipe 1 so as to form a ring shape to the fluid pipe 1. It is fixed.

  As will be described later, the left and right ends between the ribs 10b, 10b in the pipe axis direction of the fluid pipe 1 are a pair of left and right penetrations through which the center drill 4a penetrates the section 1a in advance of the cutter member 4. Parts 1d and 1d.

  On the other hand, the rib 10c is welded to the fluid pipe 1 over the substantially entire length in the circumferential direction of the fluid pipe 1 except for the through portions 1d and 1d between the ribs 10b and 10b in the fluid pipe 1. Secured to the tube 1. For this reason, each rib 10b, 10b, 10c is fixed to the outer peripheral surface of the fluid pipe 1 so that each of the ribs 10b, 10b, 10c has a substantially T shape in a side sectional view with the pipe wall of the fluid pipe 1 extending in the pipe axis direction. Thus, the strength of the fluid pipe 1 is improved.

  In order to cut the fluid pipe 1 using the cutting device 2 and the reinforcing member 10 configured as described above, first, as shown in FIG. 1, avoiding the pair of left and right through portions 1d and 1d, the section portion 1a. The ribs 10b, 10b, and 10c are welded at substantially the center in the tube axis direction. Then, the casing 3 is attached to the fluid pipe 1 in a watertight manner so as to surround the section 1a, and the storage case 5 in which the cutter member 4 is stored is connected to the casing 3 from the right side in the horizontal direction. .

  The storage case 5 at this time is connected to the advancing / retreating drive unit 6 and is fixed in a state where the height position of the housing 3 is matched with a housing (not shown). In this state, the casing 3 and the storage case 5 can be easily and watertightly connected by moving the carriage toward the fluid pipe 1 in the left-right direction on the substantially horizontal floor surface. . The left and right width dimensions of the storage case 5 are adjusted in advance so as to be the shortest by moving the case body 9 leftward with respect to the cylindrical body 8 by rotating the operation bolts and nuts in advance. deep.

  As shown in FIG. 3, by connecting the housing 3 and the storage case 5, a part of the fluid pipe 1 is hermetically sealed. Furthermore, as described above, the distal ends of the cutter member 4 and the center drill 4a are disposed close to the outer peripheral surface of the fluid pipe 1.

  Then, as shown in FIG. 4, after opening the drain valve (not shown) provided in the advance / retreat drive unit 6, the advance / retreat drive unit 6 is driven to rotate the cutter member 4 via the shaft member 6a. Advance toward the fluid pipe 1. At this time, first, the advance direction of the cutter member 4 is fixed by the center drill 4a penetrating through the section 1a from the penetrated portion 1d facing the right side in the horizontal direction.

  Furthermore, the cutter member 4 is advanced toward the fluid pipe 1 while rotating the cutter member 4 via the shaft member 6a, whereby the section 1a is cut by the cutter member 4. At this time, the section 1a is subjected to a rotational moment generated by the rotation of the cutter member 4 and the center drill 4a. However, since the rotational moment is suppressed by the ribs 10b, 10b, and 10c, the section 1a. The amount of deformation is suppressed to be small, and the load on the cutter member 4 and the center drill 4a is also suppressed. As a result, the fluid pipe 1 can be accurately cut, and the cutter member 4 and the like can be prevented from being damaged.

  The section 1a is cut by the cutter member 4 while being penetrated by the center drill 4a. The section 1a is supported by the fluid pipe 1 excluding the section 1a until it is completely cut from the fluid pipe 1, so that the load of the section 1a during the cutting is applied to the cutter member 4. Further, the deformation due to the deformation stress caused by the rotational moment accompanying the rotation of the cutter member 4 is suppressed. In particular, the fluid pipe 1 has a large rigidity obtained by increasing the section modulus by the ribs 10b, 10b, and 10c of the reinforcing member 10, and the section 1a is held until the section 1a is completely separated from the fluid pipe 1. Since it is strongly supported by the fluid pipe 1 to be removed, the load applied to the cutter member 4 can be kept extremely small.

  In this way, the section 1a is cut by the cutter member 4 while being penetrated by the center drill 4a. The section 1a cut from the fluid pipe 1 by the cutter member 4 is held in the cutter member 4 by a center drill 4a penetrating the section 1a.

  On the other hand, the fluid flowing in the fluid pipe 1 flows out of the fluid pipe 1 into the housing 3 and the storage case 5 by filling the fluid pipe 1 and fills the housing 3 and the storage case 5. The drainage valve is drained out of the cutting device 2 from the opened drain valve. Note that the chips generated by the cutting of the fluid pipe 1 by the cutter member 4 are discharged from the cutting apparatus 2 along the water flow generated from the fluid pipe 1 toward the drain valve.

  Furthermore, the cylindrical body 8 and the case main body 9 constituting the storage case 5 are subjected to fluid pressure by the fluid flowing in from the fluid pipe 1, but the movement of the case main body 9 relative to the cylindrical body 8 in the right direction is Since it is regulated by operation bolts and nuts, the storage case 5 is prevented from extending due to fluid pressure.

  Next, after closing the drain valve, as shown in FIG. 5, the shaft member 6 a of the advance / retreat drive unit 6 is retracted, and the cutter member 4 and the section 1 a are directed from the inside of the housing 3 into the storage case 5. Move. At this time, the right side portion of the cutter member 4 and a part of the section 1 a are disposed in the storage case 5, and the distal end portion of the cutter member 4 is disposed on the left side of the on-off valve 7.

  Further, by operating the operation bolt / nut and the auxiliary means, the movement range of the case body 9 in the right direction with respect to the cylindrical body 8 is allowed. At this time, since fluid pressure is applied to the case body 9, the operator can extend the storage case 5 in the right direction only by operating the operation bolt / nut and the auxiliary means. In addition, since the case body 9 can be moved in the right direction only within the movement range permitted by the operation bolts and nuts, rapid expansion due to the fluid pressure of the storage case 5 is prevented.

  The cutter member 4 connected to the case body 9 via the shaft member 6a of the advance / retreat drive unit 6 is moved to the right, which is a direction away from the fluid pipe 1, by extending the storage case 5 in the right direction. The case main body 9 moves by the distance moved in the right direction.

  The storage case 5 is longer than the cutter member 4 and the center drill 4a because the case body 9 is moved to the right by auxiliary means including fluid pressure, the operation bolt / nut and a hydraulic mechanism (not shown). The left and right width dimensions are formed. For this reason, the cutter member 4, the center drill 4a, and the section part 1a are completely stored in the storage case 5. That is, the distal end portions of the cutter member 4 and the center drill 4 a are disposed on the right side of the on-off valve 7.

  After the cutter member 4, the center drill 4a, and the section 1a are stored in the storage case 5, as shown in FIG. 6, the inside of the housing 3 is sealed watertight by sliding the on-off valve 7, The storage case 5 is removed from the housing 3 and the cutting of the fluid pipe 1 by the cutting device 2 is finished.

  After removing the storage case 5 from the housing 3, as shown in FIG. 7, the fluid control installation device 12 is attached to the housing 3 and the fluid control 11 is installed in the housing 3. As described above, the fluid control device 12 includes the housing 3 attached to the fluid pipe 1, the fluid control 11 inserted and disposed in the housing 3, a storage case 13 for storing the fluid control 11, It is mainly comprised from the advancing / retreating drive part 14 which can be advanced / retracted between the inside of the housing | casing 3 and the storage case 13 in the damping fluid 11. FIG.

  As shown in FIG. 7, an operation screw 20 is screwed into the lower end of the left portion in the storage case 13 from below. A support roller (not shown) is pivotally supported at the distal end portion of the operation screw 20 by a pivot shaft that faces the tube axis direction of the fluid tube 1. For this reason, the support roller can adjust the amount of protrusion into the storage case 13 as the operation screw 20 is screwed.

  As shown in FIG. 5, the advance / retreat drive unit 14 is watertightly connected to the right end of the storage case 13. From the left part of the advance / retreat drive unit 14, a shaft member 14 a extends horizontally toward the fluid pipe 1 in the storage case 13. The advance / retreat drive unit 14 can move the shaft member 14a forward and backward between the housing 3 in which the fluid pipe 1 is disposed and the storage case 13 by power such as hydraulic pressure or electric power. .

  A bracket 14b for connecting the shaft member 14a and the fluid control 11 is attached to the tip of the shaft member 14a. The bracket 14 b is provided with an auxiliary roller 21 that is pivotally supported by a pivot (not shown) that faces in the front-rear direction. The auxiliary roller 21 is in contact with the lower end surface of the storage case 13. For this reason, the auxiliary roller 21 moves in the base body 15 together with the shaft member 14a and the bracket 14b while rolling on the lower end surface in the storage case 13 by the driving of the advance / retreat driving unit 14 described above. . The advancing / retreating drive unit 14 is provided with a drain valve (not shown) capable of communicating the inside and the outside of the advancing / retreating drive unit 14 with each other by opening the inside and the storage case 13 in a watertight manner. Yes.

  The fluid control 11 includes a lid portion 11a formed in substantially the same shape as the inner shape of the right portion of the housing 3, and a water control portion 11b extending from the lid portion 11a toward the left. A bracket 14b can be connected to the right portion of the lid portion 11a. In addition, the water control part 11b is formed to have a front-rear width dimension that can be inserted and arranged between guide pieces 3b, 3b (see FIG. 4) projecting in the housing 3, and an upper end part and a lower end part. Is formed in a tapered shape that is inclined from the right side to the left side toward the center in the vertical width direction of the water control portion 11b. That is, the fluid control 11 in the present embodiment is formed in a tapered shape from the right side to the tip end portion which is the left end portion.

  In order to install the fluid control 11 in the housing 3 using the fluid control installation device 12 configured in this way, first, the storage case 5 which is a part of the cutting device 2 after the fluid pipe 1 is cut. Instead, the storage case 13 which is a part of the present fluid control installation device 12 is watertightly connected from the right side to the housing 3 which is watertightly sealed by the on-off valve 7. Then, after opening a drain valve (not shown) provided in the advance / retreat drive unit 14, the on-off valve 7 is opened. At this time, the fluid flowing in the fluid pipe 1 fills the storage case 13 and the housing 3 and is drained out of the cutting device 2 from the opened drain valve, and the air in the housing 3 is also It is exhausted out of the cutting device 2 through the drain valve.

  By driving the advance / retreat drive unit 14 from this state, the damping fluid 11 is moved toward the inside of the housing 3. At this time, by supporting the damping fluid 11 from below by the support roller and the auxiliary roller 21, it is possible to prevent a downward moment from being generated in the shaft member 14a via the bracket 14b due to the load of the damping fluid 11. Furthermore, since the upper end portion and the lower end portion of the damping fluid 11 are inserted between the front and rear guide pieces 3b, 3b, positional displacement in the front-rear direction due to fluid pressure is prevented from the fluid. Then, by completely inserting and arranging the fluid control 11 in the housing 3, the fluid flow path in the housing 3 is completely blocked.

  After the control fluid 11 is inserted and arranged in the housing 3, the drain valve is opened to drain the fluid in the storage case 13, and then a fixing bolt (not shown) is attached to the right side of the fluid control 11 from the outside of the housing 3. The damping fluid 11 is fixed in the housing 3 by screwing in the direction. Then, the fluid control 11 is removed from the bracket 14 b by the operator putting his hand through an operation port (not shown) provided in the storage case 13. Finally, the shaft member 14a and the bracket 14b of the advancing / retreating drive unit 14 are retracted and stored in the storage case 13, and then the casing 3 is closed by the on-off valve 7, and the fluid control 11 is installed in the casing 3. finish.

  As described above, in the method for cutting the fluid pipe 1 in this embodiment, after the reinforcing member 10 is fixed to the fluid pipe 1 to be cut by the cutter member 4 while avoiding the cutting portion of the cutter member 4, the cutter member is fixed. Since the fluid pipe 1 is cut by 4 and the cutting portion by the cutter member 4 is avoided and the reinforcing member 10 is fixed to the fluid pipe 1, the section modulus of the fluid pipe 1 can be increased and a large rigidity can be obtained. When the fluid pipe 1 is cut by advancing the cutter member 4, the load of the portion of the fluid pipe 1 cut by the cutter member 4 and the deformation stress accompanying the cutting are applied to the portion excluding the portion of the fluid pipe 1 cut. The fluid pipe 1 can be supported without being deformed, and the deformation of the fluid pipe 1 accompanying the progress of the fluid pipe 1 in the radial direction of the cutter member 4 can be suppressed, and the fluid pipe 1 can be cut without applying a large load to the cutter member 4.

  Further, the cutter member 4 cuts the fluid pipe 1 by rotating in the radial direction of the fluid pipe 1 while rotating around the central axis of the cutter member 4, and the reinforcing member 10 is cut by the cutter member 4. Since the cutter member 4 is rotated and the fluid pipe 1 is cut while the cutter member 4 is rotated, a rotational moment is applied to the cut piece portion 1a and a deformation stress is generated. Therefore, the fluid pipe 1 can be accurately cut while suppressing the deformation of the section 1a.

  Further, since the reinforcing member 10 is formed with ribs 10b and 10c protruding in the outer diameter direction of the fluid pipe 1 and extending in the circumferential direction, the ribs 10b and 10c are accompanied by the load and cutting of the section portion 1a. The slice portion 1a can be cut while being supported by the fluid pipe 1 excluding the slice portion 1a while suppressing deformation due to deformation stress.

  The cutter member 4 includes a center drill 4 a that penetrates the fluid pipe in the same axis as the center axis of the cutter member 4, and the rib 10 b includes a plurality of strips so as to sandwich the center drill 4 a in the pipe axis direction of the fluid pipe 1. Since it is formed, the deformation stress generated by the rotational moment generated in the section 1a when the fluid pipe 1 is cut while the cutter member 4 rotates can be strongly suppressed by the plurality of ribs 10b, 10b, 10c. Since the center drill 4a supports the section 1a while rotating while penetrating the section 1a, the deformation of the section 1a due to the rotational moment generated in the section 1a can be suppressed together with the ribs 10b, 10b, and 10c.

  Next, a fluid pipe cutting method according to the second embodiment will be described with reference to FIG. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted. As shown in FIG. 8A and FIG. 8B, a drill guide 16 is provided in the through portion 1d facing the right side of the reinforcing member 10 'in the present embodiment. The drill guide 16 is formed in a cylindrical shape that opens in the radial direction of the fluid pipe 1 and has an inner diameter that is substantially the same as the diameter of the center drill 4a. For this reason, when the center drill 4a is passed through the section 1a when the fluid pipe 1 is cut, the center drill 4a is passed through the section 1a with the tip of the center drill 4a inserted through the drill guide 16. Thus, the displacement of the cutting position by the cutter member 4 can be prevented.

  Further, the drill guide 16 is formed with a pair of ribs 16a and 16a extending in the direction of the pipe axis of the fluid pipe 1 facing each other. The tips of the ribs 16a and 16a are supported by the ribs 10b and 10b, respectively. Further, the drill guide 16 is formed with a pair of clamping plates 16b, 16b extending in the circumferential direction of the fluid pipe 1 which is the same direction. These clamping plates 16b and 16b are integrated with the rib 10c by clamping the rib 10c in the tube axis direction of the fluid pipe 1. Therefore, the strength of the reinforcing member 10 ′ is further improved by the ribs 16 a and 16 a and the clamping plates 16 b and 16 b included in the drill guide 16.

  As described above, the drill guide 16 in the method for cutting the fluid pipe 1 according to the present embodiment reliably guides the center drill 4a while constituting a part of the reinforcing member 10 ′ and improving the strength of the fluid pipe 1. The center drill 4a is passed through a predetermined position of the section 1a, and the cutting position for cutting the fluid pipe 1 by the cutter member 4 can be accurately determined.

  Next, a fluid pipe cutting method according to Embodiment 3 will be described with reference to FIG. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted. As shown in FIGS. 9A and 9B, a reinforcing member 17 is fixed to the fluid pipe 1 in the section 1a of the fluid pipe 1 in this embodiment. The reinforcing member 17 is composed of a pair of ribs 17b and 17b spaced apart in the tube axis direction, and each rib 17b fastens a pair of semicircular arc-shaped frame bodies with bolts and nuts 18 in the circumferential direction. Thus, it is fixed to the fluid pipe 1. When the fluid pipe 1 is cut by the cutter member 4, the center drill 4a is used between the ribs 17b and 17b of the reinforcing member 17 in the fluid pipe 1 forming the non-penetrating portion as in the first and second embodiments. Cutting is performed by the cutter member 4 while penetrating.

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

  For example, in the above-described embodiment, the fluid pipe 1 is cut by advancing the cutter member 4 substantially orthogonal to the fluid pipe 1 extending in the substantially horizontal direction from the right side in the substantially horizontal direction. If there is a sufficient space for installing the cutting device 2, for example, the cutting device 2 is provided vertically upward with respect to the fluid pipe 1 extending substantially in the horizontal direction, and the cutter member 4 is advanced from above to move the fluid The pipe 1 may be cut, or the cutter pipe member that is substantially orthogonal to the fluid pipe extending in the substantially vertical direction is advanced in the substantially horizontal direction to cut the fluid pipe. It doesn't matter.

  Moreover, in the said Example, although the fluid pipe | tube 1 made from steel was cut | disconnected by rotating the cutter member 4, when the fluid pipe | tube is comprised with a softer material than steel, such as a resin pipe | tube, a cutter is carried out. The fluid pipe 1 may be cut only by the force of pressing the fluid pipe 1 with the cutter member without rotating the member, or the fluid pipe is constituted by a cast iron pipe made of cast iron material, and the cast iron pipe is You may make it seal with the housing | casing formed in the split T shape which has a division structure.

In the embodiment, the fluid pipe 1 is cut by using the cutter member 4 having a diameter larger than that of the fluid pipe 1. However, the cutter member is formed into a fluid pipe by forming the cutter member to have a smaller diameter than the fluid pipe 1. only a portion of the 1 configured so as to be cut, may be to fix the reinforcing member to intercept part of said cutter member to cut the fluid pipe 1.

1 Fluid Pipe 1a Section 4 Cutter Member 4a Center Drill 10, 10 'Reinforcement Member 10b Rib 10c Rib 11 Fluid Control 16 Drill Guides 17, 17' Reinforcement Member 17b Rib

Claims (5)

A fluid pipe cutting method for cutting a fluid pipe by advancing a cutter member formed in a cylindrical shape in a radial direction of the fluid pipe,
After fixing the reinforcing member to the fluid pipe to be cut by the cutter member while avoiding the cutting portion of the cutter member, the cutter member remains so that the reinforcing member remains in the section cut by the cutter member. A fluid pipe cutting method, characterized by cutting a fluid pipe. The cutter member, the method of cutting fluid tube according to claim 1, characterized in that disconnecting the fluid conduit by proceeding toward the radial direction of the fluid pipe while rotating about the central axis of the cutter member .   The fluid pipe cutting method according to claim 1, wherein the reinforcing member has a rib that protrudes in the outer diameter direction of the fluid pipe and extends in the circumferential direction.   The cutter member includes a center drill that penetrates the fluid pipe in the same axis as the center axis of the cutter member, and a plurality of ribs are formed so as to sandwich the center drill in the tube axis direction of the fluid pipe. The method for cutting a fluid pipe according to claim 3.   5. The fluid pipe cutting method according to claim 4, wherein the rib forms a drill guide for guiding the center drill toward the fluid pipe.

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