Perforating apparatus

Abstract

To provide a drilling device capable of smoothly drilling an outer surface of a fluid pipe by suppressing axial deflection of a cutter.SOLUTION: A guide tube 23 provided in the case body 30 and serving as a guide member for guiding the shaft member 72b in a moving direction of the cutter 72 when drilling is performed by the cutter 72, and an anti-vibration jig 2425 fixed to a specific portion 72b to be separated by the cutter 72 on the outer surface of the fluid pipe 2 and serving as a support member for supporting the guide tube 23, the guide tube 23 including a case body 30 attached to the outer surface of the fluid pipe 2 in a sealed manner and a tubular cutter 72 provided rotatably and movably in an axial direction and having a shaft member T1 at a 2c thereof, the cutter 72 being moved in the case body 30 with the shaft member 72b directed in a non-intersecting direction with respect to a pipe axis 2a of the fluid pipe 2.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a perforation device capable of forming perforations in the outer surface of a fluid pipe. [Background technology]

[0002] Conventionally, an example of a drilling device capable of forming a perforation on the outer surface of a fluid pipe is one that has a cylindrical cutter that can be rotated around an axial member, and can form a perforation on the outer surface of the fluid pipe by moving the cutter in a direction that does not intersect with the axial member relative to the axis of the fluid pipe.

[0003] With this type of drilling device, when the cutting edge of the cutter is brought into contact with the outer surface of the fluid pipe to begin drilling, a force acts on the cutter in a sliding direction along the outer surface of the cylindrical fluid pipe, which can displace the cutter away from the appropriate position and reduce the accuracy of the drilling position.

[0004] For example, there is a device that includes a main pipe section that is sealed and attached to the outer surface of the fluid pipe, a branch pipe section that branches off from the main pipe section, and a case body that has an opening to which a drilling device can be connected, and a guide plate that is provided on the top of a cylindrical cutter, and when the cutting edge of the cutter is brought into contact with the outer surface of the fluid pipe to begin drilling, the guide plate abuts against the inner surface of the cutter tube connected to the opening, thereby preventing the cutter from being displaced away from the appropriate position (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2024-20169 A (pages 11 and 13, Figure 3) Summary of the Invention [Problem to be solved by the invention]

[0006] In the drilling device described in Patent Document 1, the guide plate is provided on the upper part of the cutter and guides the circumferential rotation at a position above and away from the blade formed on the lower part of the cutter, so when the blade of the cutter comes into contact with the outer surface of the fluid pipe, the rotation axis may tilt, causing axial wobble. Furthermore, if the axial wobble becomes even larger, it can cause the carbide tip (cutting blade) of the blade to wear out prematurely or peel off. As the cutter continues to cut and separate the outer surface of the fluid pipe, the cut pieces become unstable and the cutter is more likely to get caught, preventing smooth drilling of the outer surface of the fluid pipe. If the cutter's progress slows down, the process must be stopped before it is completed.

[0007] The present invention has been made in response to these problems, and aims to provide a drilling device that can suppress axial vibration of the cutter and smoothly drill holes in the outer surface of a fluid pipe. [Means for solving the problem]

[0008] In order to solve the above problems, the punching device of the present invention comprises: A drilling device comprising: a case body that is attached in a sealed manner to the outer surface of a fluid pipe; and a cylindrical cutter that is rotatable and axially movable and has a shaft member at its center, wherein the cutter is moved within the case body so that the shaft member is directed in a direction that does not intersect with the pipe axis of the fluid pipe, thereby forming a perforation in the outer surface of the fluid pipe, a guide member provided in the case body and configured to guide the shaft member in a movement direction of the cutter when the cutter performs drilling; a support member that is fixed to a specific portion of the outer surface of the fluid pipe that is to be cut off by the cutter, and that supports the guide member. According to this feature, when drilling with the cutter, the shaft member is guided in the direction of cutter movement by the guide member, thereby suppressing axial wobble of the cutter, and the guide member that guides the shaft member is supported by a support member fixed to the specific part, so that the relative positional relationship between the cutter and the specific part is maintained constant even as cutting progresses, making it less likely for the cutter to get caught on the specific part, allowing for smooth drilling of the outer surface of the fluid pipe.

[0009] The support member is characterized by having at least a first support member provided on the drilling start side of the cutter in the specific portion, and a second support member provided on the drilling end side of the cutter in the specific portion. According to this feature, the start side and end side of the specific part are supported separately, so that the specific part remains stable and does not wobble even as cutting progresses from start to finish, making it less likely for the specific part to get caught on the cutter.

[0010] The support member has a pair of fastening portions that are fastened to both sides of the specific portion in the axial direction of the fluid pipe. According to this feature, by fixing both sides of the specific portion in the axial direction of the fluid pipe, the specific portion remains stable and does not wobble even as the separation progresses, making it less likely for the specific portion to get caught on the cutter.

[0011] The support member is characterized by having a first member arranged on the guide member side, a second member arranged on the specific part side of the first member, and a connecting means capable of connecting and disconnecting the first member and the second member. According to this feature, the first member and the second member can be separated by releasing the connecting means, and therefore the guide member and the first member can be reused, thereby reducing manufacturing costs.

[0012] The support member is characterized by being a recovery member that recovers the fragment cut off from the fluid pipe by the cutter. According to this feature, the support member, which has the function of supporting the guide member during drilling, can be used as a recovery member.

[0013] The guide member is characterized by being provided with a locking means for locking the guide member to the shaft member. According to this feature, the shaft member is engaged with the guide member, and thus the specific portion supporting the guide member can be collected as a section of the fluid pipe together with the cutter including the shaft member.

[0014] The case body is characterized by having a bottom portion provided with a receiving tray that supports the guide member in an upright position and that can close the opening of the cutter after the cutter has finished drilling the outer surface of the fluid pipe. According to this feature, when the specific portion supporting the guide member is collected as a segment of the fluid pipe, the segment can be prevented from falling into the fluid pipe.

[0015] The shaft member is guided by the guide member before the cutter starts drilling. According to this feature, drilling starts after the shaft member is guided by the guide member, so that axial wobble of the cutter can be prevented when drilling starts.

[0016] a guide member having a flat surface that can be cut by the cutter on an outer surface that forms a curved circumferential surface of the fluid pipe; The guide member is characterized in that the flat surface is fixed so as to be substantially perpendicular to the direction of movement of the cutter. According to this feature, a guide material having a flat surface that is approximately perpendicular to the direction of movement of the cutter is provided on the outer surface that forms the curved circumferential surface of the fluid pipe, so that the cutter can be stably inserted into the guide material compared to when drilling begins in a state where the cutter is not approximately perpendicular to the curved circumferential surface of the fluid pipe, thereby preventing axial wobble of the cutter.

[0017] The guide material is fixed so as to straddle the specific portion on the outer surface of the fluid pipe and a non-specific portion surrounding the specific portion. According to this feature, when the guide material is cut by the cutter, it is possible to prevent cut pieces of the guide material remaining on the cut piece side or the non-specific portion side from falling and entering the fluid pipe. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic plan view showing a state in which a drilling device according to an embodiment of the present invention is installed in an existing fluid pipe. [Figure 2] 1A is a cross-sectional view taken along line AA in FIG. 1, and FIG. 1B is a cross-sectional view taken along line BB in FIG. [Figure 3] FIG. 2 is a vertical cross-sectional view showing a state in which the cutter is positioned at a punching standby position in the punching device. [Figure 4] FIG. 2 is a schematic perspective view showing a main part of the internal structure of the case body. [Figure 5] 10 is a cross-sectional view showing a state in which a shaft member of a cutter is inserted into a guide tube of a steady rest device. FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a perspective view showing a state in which a section of a specific portion is supported by a vibration-proof device. [Figure 8] 1A is a schematic plan view showing the contact position of the cutter with the existing fluid pipe, and FIG. 1B is a cross-sectional view taken along CC line of FIG. [Figure 9] FIG. 10 is a vertical cross-sectional view showing a state in which the cutter comes into contact with an existing fluid pipe. [Figure 10] FIG. 10 is a vertical cross-sectional view showing a state in which the cutter is drilling a hole in an existing fluid pipe. [Figure 11] FIG. 10 is a vertical cross-sectional view showing a state in which the cutter is positioned at a punching end position. [Figure 12] 1A is an enlarged cross-sectional view showing a state in which the locking member is positioned inside the guide cylinder, and FIG. 1B is an enlarged cross-sectional view showing a state in which the locking member is locked to the lower end of the guide cylinder. [Figure 13] FIG. 10 is a vertical cross-sectional view showing a state in which the cutter and the cut piece are pulled up to the top of the case body. [Figure 14] 10(a) to 10(d) are diagrams showing the process of separating the steady rest device from the cutter. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drilling device according to an embodiment of the present invention will be described below with reference to the accompanying drawings. [Example]

[0020] A drilling device according to an embodiment of the present invention will be described with reference to Figures 1 to 14. In the following description, the upper side of Figure 1 will be referred to as the rear of the drilling device, the lower side as the front, the left side as the left side, and the right side as the right side.

[0021] 1 and 2(a) and (b), a drilling device 1 according to an embodiment of the present invention is hermetically attached to a predetermined location of a fluid pipe 2 that constitutes an existing flow path. The fluid in the fluid pipe 2 is clean water in this embodiment, but is not limited to this and may be, for example, industrial water, agricultural water, sewage, or a gas or a gas-liquid mixture of gas and liquid.

[0022] The fluid pipe 2 according to the present invention is made of steel and is formed as a straight pipe having a generally circular cross section. In this embodiment, the fluid pipe 2 is disposed in a generally horizontal direction. The fluid pipe according to the present invention may be made of metal such as ductile cast iron or other cast iron, or may be made of concrete, vinyl chloride, polyethylene, polyolefin, or the like. Furthermore, the inner circumferential surface of the fluid pipe may be coated with an epoxy resin layer, mortar, plating, or the like, or the inner circumferential surface of the fluid pipe may be coated with an appropriate material by powder coating.

[0023] [Drilling device] As shown in Figures 1 to 3, the drilling device 1 is mainly composed of a case body 30 that is hermetically attached to the outer peripheral surface of an existing fluid pipe 2, a check valve device 50 that is attached to the case body 30, and a drive mechanism unit 70 that is attached above the check valve device 50 on the case body 30, and is capable of forming a drilling section 2c (see Figure 13) at a predetermined location on the outer peripheral surface of the fluid pipe 2 in an uninterrupted flow state.

[0024] [Case body] As shown in Figures 1 to 3, the case body 30 mainly comprises main pipe sections 3a, 3b surrounding the outer surface of the fluid pipe 2, a cylindrical branch pipe section 4 branching forward from the main pipe section 3a, a cylindrical body section 5 with a bottom that is large enough to accommodate a drilling cutter 72 described below, a cylindrical short pipe 8 that is sealingly connected to the opening at the upper end of the body section 5, a valve box 50a that is sealingly connected to the opening at the upper end of the short pipe 8 and that constitutes the check valve device 50, and a mounting flange tube 71 that is sealingly connected to the opening at the upper end of the valve box 50a and can accommodate a cutter 72 inside that can drill holes in the fluid pipe 2.

[0025] 2 and 3, the lower part of the case body 30 is composed of a split T-shaped pipe body 31 and a split T-shaped pipe cover 32 as segments, and has a split structure that is divided into two parts, front and rear, circumferentially along the pipe axis T1 of the fluid pipe 2, and is used as a branch pipe joint after drilling is completed. More specifically, the split T-shaped pipe body 31 is composed of a main pipe section 3a that covers the rear part of the outer circumferential surface of the fluid pipe 2, a branch pipe section 4 that protrudes from the outer surface of the main pipe section 3a, and a body section 5 that is provided so as to straddle the main pipe section 3a and the branch pipe section 4. On the other hand, the split T-shaped pipe cover 32 consists only of the main pipe section 3b that covers the front part of the outer circumferential surface of the fluid pipe 2.

[0026] In this embodiment, the split T-shaped pipe cover 32 is composed of only the main pipe portion 3b, but it may also have a branch pipe portion. The branch pipe portion may also be separable at the dividing surfaces of the front and rear divided bodies. Furthermore, while the case body 30 in this embodiment is composed of two divided bodies (the split T-shaped pipe main body 31 and the split T-shaped pipe cover 32), it may also be composed of three or more divided bodies.

[0027] The main pipe sections 3a, 3b are formed in a roughly semicircular arc shape when viewed in the pipe axis direction, and are attached in a sealed manner so as to sandwich the outer circumferential surface of the fluid pipe 2 from the front and rear. The main pipe sections 3a, 3b are also sealedly fitted onto the outer circumferential surface of the fluid pipe 2, and both ends in the pipe axis direction are welded to the fluid pipe 2 by divided plate-shaped annular members 10, 10, and are fixed in a sealed manner.

[0028] 1 and 2, the branch pipe section 4 is formed in a cylindrical shape having a central axis T2 that is substantially perpendicular to the pipe axis T1 of the fluid pipe 2 and extends substantially horizontally in the front-to-rear direction. An on-off valve device 40 having a valve element (not shown) such as a butterfly valve that can rotate about a rotation axis (not shown) that is substantially perpendicular to the central axis T2 is hermetically connected to the opening at the front end of the branch pipe section 4. Furthermore, the branch pipe 6 is hermetically connected to the on-off valve device 40, and therefore the branch pipe 6 is hermetically connected to the branch pipe section 4 via the on-off valve device 40.

[0029] Furthermore, a perforated section 2c (see Figure 13) is formed by a drilling operation described below at a location in the fluid pipe 2 corresponding to the branch hole 4a (see Figure 4) of the branch pipe section 4, so that the fluid pipe 2 and the branch pipe 6 can be brought into a connected or disconnected state by opening and closing the valve body (not shown) of the opening / closing valve device 40.

[0030] 3, the body 5 is formed so that the central axis T3, which faces the up-down direction, is perpendicular to the central axis T2 of the branch pipe section 4 at a position forward of the outer circumferential surface of the fluid pipe 2. A short pipe 8 is hermetically connected to an opening formed at the upper end of the body 5 via a seal member (not shown).

[0031] The gate valve device 50 has a cylindrical valve box 50a that penetrates vertically, a valve cover 50b (see FIG. 2) that is formed to protrude rightward from the valve box 50a and is connected to the valve box 50a via a communication port (not shown) formed on the inner peripheral surface, a valve element 50c that is provided so as to be movable substantially horizontally between the valve box 50a and the valve cover 50b, and a seat (not shown) that serves as a valve seat for receiving the valve element 50c. A seal member (not shown) for the valve element 50c can be tightly fitted to the seat (not shown).

[0032] The valve box 50a is hermetically connected to the opening at the upper end of the body 5 via a seal member (not shown). Furthermore, the end of a valve stem (not shown) that is threadedly engaged with a valve element 50c inside the valve lid 50b protrudes from the tip of the valve lid 50b, and an operating handle (not shown) is provided at the end of this valve stem. By rotating the operating handle, the valve element 50c can be moved between the valve box 50a and the valve lid 50b, thereby opening and closing the inside of the case body 30. Furthermore, a mounting flange cylinder 71 of the drive mechanism 70 is hermetically connected to the opening at the upper end of the valve box 50a via a seal member (not shown).

[0033] As shown in FIG. 3, the drive mechanism 70 is mainly composed of a mounting flange tube 71 made of a cylindrical member with a closed opening at the top end, a cutter 72 for cutting the fluid pipe 2, a drive motor (not shown) for rotating the cutter 72 inside the mounting flange tube 71, and an advancing / retreating mechanism 73 provided above the mounting flange tube 71 for advancing and retracting the cutter 72 toward and from the fluid pipe 2.

[0034] The cutter 72 is cylindrical and has an outer diameter L2 that is larger than the outer diameter L1 of the fluid pipe 2 (L2>L1). The cutter 72 is primarily comprised of a hole saw 72a with a cutting blade 72c having a carbide tip circumferentially extending at its lower end, and a shaft member 72b that is disposed coaxially with the center of rotation of the hole saw 72a and protrudes beyond the cutting blade 72c. The cutter 72 is rotatably attached to the lower part of the reciprocating mechanism 73 around the shaft member 72b. A locking member 74 is detachably attached to the lower end of the shaft member 72b. The cutter 72 of this embodiment has a relatively large outer diameter L2 of approximately 2150 mm.

[0035] 12(a) and 12(b), the locking member 74 is composed of a tapered stop rod 74a made of a metal material, a stop ring 74b made of hard vinyl chloride resin, and a threaded portion 74c protruding from the upper part of the stop rod 74a, and is attached to the shaft member 72b by threading the threaded portion 74c into a threaded hole formed at the tip of the shaft member 72b. The stop ring 74b is formed so that its outer diameter is larger than the inner diameter of the guide tube 23, and is inserted into the inside of the guide tube 23 by contracting due to elastic deformation, and when it deviates from the inside of the guide tube 23, its diameter expands due to elastic restoring force.

[0036] In addition, the cutter 72 is arranged so that its shaft member 72b, which serves as the center of rotation, is concentric with the central axis T3 of the body 5, short pipe 8, valve box 50a, and mounting flange tube 71, and is capable of moving (raising and lowering) in the vertical direction via the advance / retract mechanism 73 between a drilling standby position (see Figure 3) housed within the mounting flange tube 71 and a drilling completion position (see Figure 11) housed within the body 5.

[0037] 4, a branch hole 4a is formed in the main pipe section 3a at a location corresponding to the branch pipe section 4, and a portion of the outer circumferential surface of the fluid pipe 2 (a region including a specific section 2a (a dotted region in the figure) described below) is exposed through the branch hole 4a so as to protrude into the body section 5. The central axis T3 of the body section 5 is substantially perpendicular to the central axis T2 of the branch pipe section 4 at a position away from the outer circumferential surface of the fluid pipe 2 (see FIG. 3). Therefore, by lowering the hole saw 72a while it is positioned within the mounting flange tube 71 so that the shaft member 72b is concentric with the central axis T3, approximately half of the outer diameter direction of the outer circumferential surface of the fluid pipe 2 is cut in a substantially C-shape in plan view, and a perforated section 2c (see FIG. 13) is formed.

[0038] As shown in FIGS. 3 and 4, a vibration prevention device 20 is provided inside the body 5 to prevent the axial vibration of the cutter 72 during drilling.

[0039] [Sway prevention device] As shown in Figure 5, the anti-vibration device 20 is mainly composed of a receiving tray 21 placed on the upper surface of the bottom 5b of the body 5, a receiving tray main body 22 provided at the center of the receiving tray 21, a guide tube 23 erected on the top of the receiving tray main body 22, anti-vibration jigs 24, 25 attached respectively to the upper and lower positions on the outer periphery of the guide tube 23, and a plate rubber gasket 26 attached to the underside of the receiving tray 21 with a screw member (not shown).

[0040] As shown in Figure 5, the pedestal tray 21 is formed in a circular ring shape in a plan view with an opening in the center. The outer diameter of the pedestal tray 21 is slightly smaller than the inner diameter of the hole saw 72a, so that it can fit into the opening at the bottom of the hole saw 72a to close it. Attached to the opening at the center of the pedestal tray 21 is a pedestal main body 22 made of a cylindrical member and having an inner diameter larger than the inner diameter of the guide tube 23. The opening at the bottom of the pedestal main body 22 is closed by a disc-shaped plate rubber gasket 26, and the opening at the bottom of the pedestal main body 22 can be opened by removing the plate rubber gasket 26.

[0041] The plate rubber gasket 26 has a cylindrical protrusion 26a protruding from its underside, and is positioned relative to the body 5 by fitting the protrusion 26a into a positioning recess 5c (see Figure 3) formed at the center of the bottom 5b of the body 5.

[0042] 5, the guide tube 23 has an inner diameter slightly larger than the outer diameter of the shaft member 72b of the cutter 72, and a vertical dimension shorter than the vertical dimension of the shaft member 72b of the cutter 72. Inside the guide tube 23, a bearing 23a made of a cylindrical member divided into multiple parts in the axial direction is provided so as to be rotatable relative to the guide tube 23 in the circumferential direction. This allows the shaft member 72b inserted inside to be rotatable relative to the guide tube 23 and to be guided to move in the axial direction.

[0043] As shown in Figure 6, the anti-vibration jig 24 is mainly composed of two metal split bands 24a, 24b as mounting fixtures attached to the outer peripheral surface of the guide tube 23, and a pair of left and right metal support arms 24c, 24c extending radially outward from the outer surface of the split band 24a, and is supported at the upper position of the guide tube 23.

[0044] The pair of left and right support arms 24c, 24c are arranged apart from each other at an angle of approximately 80 degrees in the circumferential direction of the guide tube 23, and extend radially in a direction approximately perpendicular to the axis of the guide tube 23. The support arms 24c, 24c have fixing pieces 24d, 24d protruding from the outer surface of the split band 24a, plates 24e, 24e attached to the fixing pieces 24d, 24d via screw members N1, and angle members 24f, 24f attached to the plates 24e, 24e via screw members N2, and the plates 24e, 24e and the angle members 24f, 24f can be separated by removing the screw members N2 to release the connection.

[0045] The angle members 24f, 24f are formed from a metal material with a generally mountain-shaped cross section, and the tip surface 24g is formed to slope upward toward the tip, so that it can abut from behind against the upper part of the outer circumferential surface of the fluid pipe 2. The shape of the tip surface 24g of the angle member 24f can be changed as appropriate to match the curvature of the outer circumferential surface of the fluid pipe 2.

[0046] As shown in Figure 6, the vibration-prevention jig 25 is mainly composed of two metal split bands 25a, 25b as mounting fixtures attached to the outer peripheral surface of the guide tube 23, and a pair of left and right metal support arms 25c, 25c extending radially outward from the outer surface of the split band 25a, and is supported at a lower position of the guide tube 23.

[0047] The pair of left and right support arms 25c, 25c are arranged apart from each other at an angle of approximately 80 degrees in the circumferential direction of the guide tube 23, and extend in a direction approximately perpendicular to the axis of the guide tube 23. The support arms 25c, 25c have fixing pieces 25d, 25d protruding from the outer surface of the split band 25a, plates 25e, 25e attached to the fixing pieces 25d, 25d via screw members N1, and angle members 25f, 25f attached to the plates 25e, 25e via screw members N2, and the plates 25e, 25e and the angle members 25f, 25f can be separated by removing the screw members N2 to release the connection.

[0048] The angle members 25f, 25f are formed of a metal material with a generally angled cross section, and the tip surface 25g is formed to slope downward toward the tip, so that it can abut from behind against the lower part of the outer circumferential surface of the fluid pipe 2. The shape of the tip surface 25g of the angle member 25f can be changed as appropriate to match the curvature of the outer circumferential surface of the fluid pipe 2.

[0049] Although not shown in detail, one of the fixed pieces 24d, 24d and the plates 24e, 24e has an elongated hole (not shown) through which the screw member N1 can be inserted, and by moving the plates 24e, 24e relative to the fixed pieces 24d, 24d in the direction in which the support arms 24c, 24c extend, the length of the support arms 24c, 24c can be finely adjusted. Also, one of the fixed pieces 25d, 25d and the plates 25e, 25e has an elongated hole (not shown) through which the screw member N1 can be inserted, and by moving the plates 25e, 25e relative to the fixed pieces 25d, 25d in the direction in which the support arms 25c, 25c extend, the length of the support arms 25c, 25c can be finely adjusted.

[0050] Furthermore, since the plates 24e, 24e, 25e, 25e and the angle irons 24f, 24f, 25f, 25f can be separated, when changing the length of the support arms 24c, 24c from the guide tube 23 to the specific part 2a depending on the outer diameter dimensions of the fluid pipe 2, etc., this can be easily accommodated by preparing plates 24e, 24e, 25e, 25e of different lengths.

[0051] The anti-vibration device 20 configured in this manner can be placed inside the body 5 by placing the receiving tray 21 on the upper surface of the bottom 5b of the body 5, as shown in Fig. 4. In addition, as shown in Fig. 3, the anti-vibration device 20 is positioned relative to the body 5 so that the guide tube 23 is concentric with the central axis T3 of the body 5 by fitting the protrusion 26a of the plate rubber gasket 26 into the positioning recess 5c of the bottom 5b.

[0052] 8(a) and 8(b), the region of the outer circumferential surface of the fluid pipe 2 that is exposed from the branch hole 4a into the body 5 includes a specific portion 2a (the dotted region in FIG. 8(a)) that is cut off by a cutter 72 as described below, and a surrounding annular non-specific portion 2d (the hatched region in FIG. 8(a)). The upper portion of the region facing the body 5 from the branch hole 4a is a contact position where a portion of the circumferential direction of the cutting blade 72c of the descending hole saw 72a comes into contact, and a metal guide member 28 is fixed to this contact position by welds 28w, 28x (see the enlarged view in FIG. 9).

[0053] The guide member 28 is formed into a generally L-shape in side view by a horizontal plate 28a and a vertical plate 28b, and is arranged so that the horizontal plate 28a and the vertical plate 28b are aligned along the pipe axis T1 and at a position where a circumferential portion (front portion) of the cutting blade 72c of the hole saw 72a contacts an upper surface 28c of the horizontal plate 28a, and the rear side of the horizontal plate 28a and the lower side of the vertical plate 28b are welded to the outer peripheral surface of the fluid pipe 2 while abutting against the outer peripheral surface of the fluid pipe 2. The upper surface 28c is formed as a flat surface.

[0054] More specifically, the guide member 28 is fixed at the lower side of the vertical plate 28b to the specific portion 2a of the outer peripheral surface of the fluid pipe 2 by a welded portion 28x, and at the rear side of the horizontal plate 28a to the non-specific portion 2d by a welded portion 28w. In other words, the guide member 28 is fixed to the outer peripheral surface of the fluid pipe 2 so as to straddle the specific portion 2a and the non-specific portion 2d (see the enlarged view in FIG. 9).

[0055] [Fluid pipe drilling process] Next, the process of forming the perforated portion 2c in the specific portion 2a on the outer circumferential surface of the fluid pipe 2 in an uninterrupted flow state will be described with reference to the drawings.

[0056] First, as shown in Figure 3, the main pipe portion 3a of the split T-pipe body 31 and the main pipe portion 3b of the split T-pipe cover 32 are hermetically attached to predetermined locations on the outer circumferential surface of the fluid pipe 2, and the predetermined locations of the fluid pipe 2 are hermetically covered by the case body 30. Next, the receiving tray 21 is placed on the top surface of the bottom 5b of the body 5, the protrusion 26a of the plate rubber gasket 26 is fitted into the positioning recess 5c of the bottom 5b, and the steadying device 20 is positioned relative to the body 5 so that the guide tube 23 is concentric with the central axis T3 of the body 5.

[0057] 7, the tip surfaces 24g, 24g and 25g, 25g of the pair of left and right support arms 24c, 24c and 25c, 25c of each of the upper and lower vibration-preventing jigs 24, 25 are fixed by welds 24w, 25w to the surface of the specific portion 2a (the portion that will become the section 2b after drilling as shown in FIG. 7) on the outer circumferential surface of the fluid pipe 2. At this time, the tip surfaces 24g, 25g can be easily brought into contact with the surface of the specific portion 2a on the outer circumferential surface of the fluid pipe 2 by loosening the screw members N1 and adjusting the positions of the plates 24e, 25e in the extension direction relative to the fixing pieces 24d, 25d and the positions of the plates 25e, 25e in the extension direction relative to the fixing pieces 25d, 25d.

[0058] Tip surfaces 24g, 24g of a pair of left and right support arms 24c, 24c of the upper anti-vibration jig 24 are welded and fixed to the upper left and right sides of the specific part 2a, and tip surfaces 25g, 25g of a pair of left and right support arms 25c, 25c of the lower anti-vibration jig 25 are welded and fixed to the lower left and right sides of the specific part 2a. As a result, the specific part 2a on the outer peripheral surface of the fluid pipe 2 is integrated with the anti-vibration device 20, and the guide tube 23 is supported by the specific part 2a via the upper and lower anti-vibration jigs 24, 25.

[0059] Next, the case body 30 is filled with fluid while air is released from an air release valve (not shown) provided at the top of the mounting flange tube 71, and water pressure approximately equal to that inside the fluid pipe 2 is applied inside the case body 30 to check for leaks, and then the air release valve (not shown) is closed after it is confirmed that the air has been released from inside the case body 30. Next, with the pressure inside the case body 30 and the inside of the fluid pipe 2 approximately equal, the valve body 50c is opened and the advance / retract mechanism 73 advances the cutter 72 downward.

[0060] As shown in Figure 9, as the cutter 72 rotates and descends, the shaft member 72b moves along the central axis T3, i.e., in a direction that does not intersect with the pipe axis T1 of the fluid pipe 2. Then, the locking member 74, which is attached to the lower end of the shaft member 72b and protrudes downward from the lower end of the hole saw 72a, is inserted into the guide tube 23 through the opening at the upper end. During insertion, the stop ring 74b (see Figure 12(a)) is elastically deformed to reduce its diameter, thereby being inserted into the guide tube 23. Thereafter, the cutter 72 is rotated around the shaft member 72b by the drive motor (not shown) of the advance / retract mechanism 73.

[0061] Next, the circumferential front portion of the cutting blade 72c at the lower end of the hole saw 72a contacts the upper surface 28c of the guide member 28 fixed to the outer peripheral surface of the fluid pipe 2 (see FIGS. 8(a) and 8(b)). In this manner, the lower end of the shaft member 72b of the cutter 72 is inserted into the guide tube 23 of the steady-state device 20, and the shaft member 72b is guided by the guide tube 23 to move downward. Then, the cutting blade 72c of the hole saw 72a contacts the upper surface 28c of the guide member 28, and cutting begins. In this manner, the shaft member 72b is rotatably supported about its axis by the guide tube 23, which is supported integrally with the specific portion 2a of the fluid pipe 2 via the upper and lower steady-state jigs 24, 25. This suppresses axial wobble even when the hole saw 72a comes into contact with the guide member 28 or the fluid pipe 2.

[0062] Furthermore, the circumferential front portion of the cutting blade 72c at the lower end of the hole saw 72a first comes into contact with the upper surface 28c of the guide material 28, which is approximately perpendicular to the shaft member 72b of the hole saw 72a, rather than with the outer peripheral surface of the fluid pipe 2, which is inclined relative to the shaft member 72b of the hole saw 72a. Therefore, upon initial contact, the cutting blade 72c of the hole saw 72a does not slip in the inclined direction of the outer peripheral surface of the fluid pipe 2 and deviate from the appropriate cutting position; by coming into contact with the approximately flat upper surface 28c, the cutting blade 72c is prevented from shifting position, and the cutting blade 72c can be allowed to bite into the guide material 28.

[0063] In addition, the hole saw 72a that has bitten into the guide material 28 cuts along the path it has taken, making it less likely to vibrate. Furthermore, by cutting the horizontal plate 28a of the guide material 28 before the fluid pipe 2, the cutting blade 72c can be caused to bite into the outer surface of the fluid pipe 2 while maintaining a state in which the inner and outer peripheral surfaces of the hole saw 72a are close to or in sliding contact with the front and rear cutting end faces 28h, 28h of the horizontal plate 28a and are guided in the circumferential direction, as shown in the enlarged view of Figure 10.

[0064] When the cutting blade 72c bites into the outer peripheral surface of the fluid pipe 2 and begins cutting the outer peripheral surface of the fluid pipe 2, the cutting blade 72c enters the inside of the opening periphery of the branch hole 4a on the outer peripheral surface of the fluid pipe 2 (see Figure 8(a)), and cuts the fluid pipe 2 from the top of the specific portion 2a downward along the opening periphery of the branch hole 4a.

[0065] As shown in Figure 10, the cutter 72 descends further and the periphery of the specific portion 2a is gradually separated from the non-specific portion 2d from the top to the bottom, making the specific portion 2a unstable. However, since the upper and lower parts of the specific portion 2a are supported by the guide tube 23 via a pair of left and right support arms 24c, 24c, 24c, 25c of the upper and lower anti-vibration jigs 24, 25, the positional relationship with the shaft member 72b, which is the central axis of the cutter 72, does not change, and the specific portion 2a does not wobble or fall over, so it does not get caught on the hole saw 72a.

[0066] 11, when the hole saw 72a reaches the drilling end position, the specific portion 2a is separated from the fluid pipe 2 as a piece 2b, and a drilled portion 2c is formed in an area surrounded by the non-specific portion 2d on the outer circumferential surface of the fluid pipe 2. As shown in FIG. 7, the piece 2b separated from the fluid pipe 2 remains connected to the guide tube 23 of the steady rest device 20 even after being separated, and therefore does not fall under its own weight but is held in place.

[0067] Furthermore, after the specific portion 2a has been cut off, a portion of the horizontal plate 28a of the guide material 28 remains welded to the upper outer surface of the non-specific portion 2d of the fluid pipe 2, and the vertical plate 28b and a portion of the horizontal plate 28a of the guide material 28 remain welded to the upper portion of the cut-off piece 2b, thereby preventing the cut piece of the guide material 28 from falling and entering the fluid pipe 2 through the perforated portion 2c.

[0068] 12(a), the locking member 74 descending inside the guide tube 23 deviates from the opening at the bottom end of the guide tube 23 and enters the inside of the pedestal body 22 as shown in Fig. 12(b), causing the stop ring 74b to expand in diameter due to elastic deformation, and the periphery of the stop ring 74b locks onto the periphery of the opening at the bottom end of the guide tube 23. As a result, the steady rest device 20 with the integrated piece 2b locks onto and is integrated with the cutter 72 as shown in Fig. 11.

[0069] When drilling is complete, the rotation of the cutter 72 is stopped, and as shown in Figure 13, the advance / retract mechanism 73 moves the cutter 72 upward and away from the body 5. At this time, the steady rest device 20 also moves upward together with the cutter 72, thereby recovering the cut pieces 2b. In addition, the opening at the bottom end of the cutter 72 is closed by the receiving tray 21, preventing the cut pieces 2b from falling.

[0070] After the cutter 72 is pulled up to the inside of the mounting flange cylinder 71, the valve element 50c is moved toward the valve box 50a to close it, the fluid inside the mounting flange cylinder 71 is drained, and then the mounting flange cylinder 71 is removed from the valve box 50a. Next, the cutter 72 is removed from the mounting flange cylinder 71, and the steady rest device 20 is removed from the cutter 72.

[0071] As shown in Figure 14(a), when removing the steady-state anti-vibration device 20 from the cutter 72, first, the cutter 72 is transported to a predetermined work space using a crane or other device (not shown) and placed sideways with the cut piece 2b facing downwards. Next, the plate rubber gasket 26 is removed from the underside of the receiving tray 21, and the locking member 74 screwed onto the lower end of the shaft member 72b is removed. This releases the lock between the shaft member 72b and the guide tube 23, making it possible to remove the steady-state anti-vibration device 20 from the cutter 72.

[0072] 14(b), extraction jig 80 is attached to the underside of receiving tray 21. Extraction jig 80 is inserted into receiving tray main body 22 from the underside of receiving tray 21 and is composed of rod 80a connected to the lower end of shaft member 72b, support plate 80b fixed to the tip of rod 80a, and guide rod 80c protruding from the periphery of receiving tray main body 22 on the underside of receiving tray 21 and inserted into multiple insertion holes (not shown) formed in support plate 80b. In addition, each of the internal screw members N2 is removed from the outside through holes formed on the outer peripheral surface of hole saw 72a to release the connection between plates 24e, 24e, 25e, 25e and angle irons 24f, 24f, 25f, 25f.

[0073] 14(c), while the receiving tray 21 is supported by the rod 80a via the guide rod 80c and the support plate 80b, it is slid in a direction away from the cutter 72. This allows the guide tube 23 to be pulled out from the shaft member 72b, leaving behind the angle irons 24f, 24f, 25f, 25f, and the steady rest device 20 to be removed from the cutter 72.

[0074] Furthermore, as shown in Figure 14(d), by removing the screw member N1 and releasing the connection between the fixed pieces 24d, 24d and the plates 24e, 24e, and removing the plates 24e, 24e, the plates 24e, 24e are prevented from coming into contact with the piece 2b, thereby opening the opening at the lower end of the hole saw 72a and making it possible to easily retrieve the piece 2b stored inside.

[0075] Furthermore, by separately preparing angle irons 24f, 24f, 25f, 25f that are separate from the angle irons 24f, 24f, 25f, 25f welded to the segment 2b, the components other than the angle irons in the anti-vibration device 20 can be used in common for multiple drilling operations.

[0076] After removing the drive mechanism 70 from the gate valve device 50, a cover member (not shown) is placed on the opening at the upper end of the body 5, and it is confirmed that the water is sealed off, and the work process is completed. The lower part of the case body 30, excluding the mounting flange tube 71, is used as a branch pipe joint.

[0077] [Actions and Effects] As described above, the drilling device 1 as an embodiment of the present invention comprises a case body 30 that is hermetically attached to the outer surface of the fluid pipe 2, and a cylindrical cutter 72 that is rotatable and axially movable and has an axial member 72b at its center. By moving the cutter 72 within the case body 30 so that the axial member 72b is in a direction that does not intersect with the pipe axis T1 of the fluid pipe 2, a drilling portion 2c can be formed on the outer surface of the fluid pipe 2. The device also comprises a guide tube 23 that is provided within the case body 30 and serves as a guide member that guides the axial member 72b in the movement direction of the cutter 72 when drilling with the cutter 72, and anti-vibration jigs 24, 25 that are fixed to a specific portion 2a that is cut off by the cutter 72 on the outer surface of the fluid pipe 2 and serve as support members that support the guide tube 23.

[0078] According to this, when drilling with the cutter 72, the shaft member 72b is guided in the movement direction of the cutter 72 by the guide tube 23, thereby suppressing axial wobble of the cutter 72, and the guide tube 23, which guides the movement of the shaft member 72b, is supported by the vibration-preventing jigs 24, 25 fixed to the specific portion 2a, so that the relative positional relationship between the cutter 72 and the specific portion 2a is kept constant even as cutting progresses, making it less likely for the cutter 72 to get caught on the specific portion 2a, thereby enabling smooth drilling of the outer surface of the fluid pipe 2. Furthermore, suppressing axial wobble of the cutter 72 prevents early wear and peeling of the carbide tip of the cutting blade 72c, extending the life of the cutter 72 and leading to reduced costs for machine rentals, etc.

[0079] Furthermore, the support member has at least an anti-vibration jig 24 as a first support member provided on the drilling start side of the cutter 72 in the specific part 2a, and an anti-vibration jig 25 as a second support member provided on the drilling end side of the cutter 72 in the specific part 2a. As a result, the drilling start side and the drilling end side in the specific part 2a are supported separately, and the specific part 2a remains stable and does not wobble even as cutting progresses from start to finish, making it less likely for the specific part 2a to get caught on the cutter 72.

[0080] In addition, the support member has support arms 24c, 24c, 25c, 25c as a pair of fixing parts fixed to both sides of the specific part 2a in the pipe axis direction T1 of the fluid pipe 2, and by fixing both sides of the specific part 2a in the pipe axis direction T1 of the fluid pipe 2, the specific part 2a becomes stable and does not wobble even when the separation progresses, and the specific part 2a is less likely to get caught on the cutter 72.

[0081] Furthermore, the support member has plates 24e, 24e, 25e, 25e as first members arranged on the guide tube 23 side, angle irons 24f, 24f, 25f, 25f as second members arranged on the specific section 2a side of the plates 24e, 24e, 25e, 25e, and screw members N2 as connecting means that can connect and disconnect the plates 24e, 24e, 25e, 25e and the angle irons 24f, 24f, 25f, 25f.By removing the screw members N2, the plates 24e, 24e, 25e, 25e can be separated from the angle irons 24f, 24f, 25f, 25f, and therefore the guide tube 23 and the plates 24e, 24e, 25e, 25e can be reused, thereby reducing manufacturing costs.

[0082] Furthermore, the anti-vibration jigs 24, 25 as support members are recovery members that recover the pieces 2b that have been cut off from the fluid pipe 2 by the cutter 72, and therefore the anti-vibration jigs 24, 25, which have the function of supporting the guide tube 23 during drilling, can be used as recovery members for the pieces 2b.

[0083] Furthermore, by providing a locking member 74 as locking means for locking the guide tube 23 to the shaft member 72b upon completion of drilling the outer surface of the fluid pipe 2 by the cutter 72, the shaft member 72b is locked to the lower end of the guide tube 23 upon completion of drilling the outer surface of the fluid pipe 2, and the specific portion 2a supporting the guide tube 23 can be recovered as a piece 2b together with the cutter 72 including the shaft member 72b. Note that the locking of the guide tube 23 by the locking means is performed not only when the cutter 72 has finished drilling the outer surface of the fluid pipe 2, but may also be performed before or after drilling is completed.

[0084] Furthermore, by providing a receiving tray 21 that supports the guide tube 23 in an upright position at the bottom 5b of the case body 30 and can close the opening at the lower end of the cutter 72 that has finished perforating the outer surface of the fluid pipe 2, it is possible to prevent the piece 2b from falling and entering the fluid pipe 2 when the specific part 2a that supports the guide tube 23 is recovered as a piece 2b.

[0085] Furthermore, by guiding the shaft member 72b to the guide tube 23 before the cutter 72 starts drilling, it is possible to prevent the shaft of the cutter 72 from wobbling when drilling starts.

[0086] In addition, a guide material 28 having an upper surface 28c as a flat surface that can be cut by the cutter 72 is provided at the portion of the curved outer surface of the fluid pipe 2 where the cutter 72 starts to drill, and the guide material 28 is fixed to the outer peripheral surface that forms the curved surface of the fluid pipe 2 so that the upper surface 28c is approximately perpendicular to the movement direction (up and down direction) of the cutter 72.This allows the hole saw 72a to stably bite into the guide material 28 compared to when drilling starts in a state where the hole saw 72a is not approximately perpendicular to the curved surface of the fluid pipe 2, and therefore axial wobble of the hole saw 72a can be prevented.

[0087] Furthermore, the guide material 28 is fixed so as to straddle the specific portion 2a on the outer peripheral surface of the fluid pipe 2 and the non-specific portion 2d around the specific portion 2a, so that when the horizontal plate 28a of the guide material 28 is cut by the hole saw 72a, the cut pieces of the guide material 28 remaining on the cut piece 2b side or the non-specific portion 2d side of the guide material 28 can be prevented from falling and entering the fluid pipe 2.

[0088] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0089] For example, in the above embodiment, the guide tube 23 is used as an example of a guide member that guides the shaft member 72b in the movement direction of the cutter 72, but the present invention is not limited to this, and the guide tube 23 need not be a cylindrical member that guides the shaft member 72b inserted therein, as long as it can guide the shaft member 72b in the movement direction of the cutter 72. Also, while the guide tube 23 is erected on the upper surface of the receiving tray 21 positioned on the body 5, it does not necessarily have to be supported by the case body 30 including the body 5. Therefore, the receiving tray 21 does not necessarily have to be provided.

[0090] Furthermore, in the above embodiment, an example was given of a form in which, in the drilling process of the fluid pipe 2, the cutter 72 begins drilling the outer surface of the guide material 28 and the fluid pipe 2 after the shaft member 72b is inserted into the guide tube 23, but the present invention is not limited to this, and it is sufficient that the shaft member 72b is guided by the guide tube 23 when drilling is performed by the cutter 72, and for example, the shaft member 72b may be guided by the guide tube 23 as soon as drilling by the cutter 72 begins.

[0091] Furthermore, in the above embodiment, an example of a support member is given in which anti-vibration jigs 24, 25 consisting of support arms 24c, 24c are used, but the present invention is not limited to this, and the support member may be made of a member other than an arm member, such as a plate-shaped member.

[0092] In the above embodiment, the support members are exemplified by the upper and lower anti-sway jigs 24, 25, each consisting of a pair of left and right support arms 24c, 24c. However, the present invention is not limited to this, and the support members do not have to be a pair of upper and lower support arms. Furthermore, the anti-sway jigs 24, 25 do not necessarily have to have a pair of left and right fastening portions, but may have only one fastening portion, or may have three or more fastening portions.

[0093] Furthermore, in the above-described embodiment, the tip surfaces 24g, 24g, 25g, 25g of the pair of left and right support arms 24c, 24c, 25c, 25c are fixed to the surface of the specific portion 2a on the outer peripheral surface of the fluid pipe 2 by welds 24w, 25x, and the guide member 28 is fixed to the outer peripheral surface of the fluid pipe 2 by welds 28x, 28w, but the present invention is not limited to this, and fastening may be done by methods other than welding, such as with adhesives or screws. In other words, "fixing" a support member to a specific portion and "fixing" a guide member to the outer surface of the fluid pipe simply mean that the support member or guide member is attached to the specific portion or fluid pipe in a fixed state so that it does not move or come off, and includes fixing by welding, adhesive, or fastening with screws, bolts, etc.

[0094] In the above embodiment, the support member includes the plates 24e, 24e, 25e, 25e as the first members, the angle members 24f, 24f, 25f, 25f as the second members arranged closer to the specific portion 2a than the plates 24e, 24e, 25e, 25e, and the screw member N2 as the connecting means for connecting and disconnecting the plates 24e, 24e, 25e, 25e and the angle members 24f, 24f, 25f, 25f. However, the present invention is not limited to this, and the support member may be configured with a single member. In this case, after the drilling operation is completed, the support member can be cut on-site to separate the steady rest device 20 from the section 2b.

[0095] Furthermore, in the above embodiment, a form was exemplified in which the specific portion 2a (slice 2b) is slightly smaller than the area exposed inside the body 5 from the branch hole 4a on the outer surface of the fluid pipe 2, but the present invention is not limited to this, and the area exposed inside the body 5 from the branch hole 4a on the outer surface of the fluid pipe 2 and the specific portion 2a (slice 2b) may be approximately the same size.

[0096] Furthermore, in the above embodiment, as an example of a locking means for locking the guide tube 23 to the shaft member 72b, a locking member 74 having an elastically lockable stop ring 74b is used, but the present invention is not limited to this, and other locking means configured to be changeable between a locked state and a released state, such as a locking pin that is biased so as to be able to be engaged and disengaged with respect to a locking hole, may also be used.

[0097] Furthermore, in the above embodiment, an example was given in which the guide member 28 having the upper surface 28c as a flat surface that can be cut by the cutter 72 was fixed to the portion of the outer surface of the fluid pipe 2 where the cutter 72 starts drilling, i.e., the portion where the cutting blade 72c of the cutter 72 comes into contact, but the present invention is not limited to this, and the guide member 28 may be fixed to the portion that comes into contact with the cutting blade 72c of the cutter 72 immediately after it comes into contact with the outer surface of the fluid pipe 2 and starts drilling, or a guide member may not necessarily be provided. Furthermore, the flat surface does not necessarily have to be flat as long as it is fixed approximately parallel to the cutting blade 72c of the cutter 72.

[0098] In the above embodiment, the guide member 28 is used as an example of a guide member, but the present invention is not limited to this. The shape of the guide member 28 does not have to be an angled cross section, and various modifications are possible as long as it has a flat surface that can be cut by the cutter 72. Furthermore, a guide groove having a predetermined depth that matches the shape of the hole saw 72a may be formed in the upper surface 28c of the guide member 28. In this case, the inner and outer peripheral surfaces of the hole saw 72a are guided by the side surfaces of the guide groove upon contact, thereby more effectively suppressing axial runout. In this case, it is preferable to form the bottom surface of the guide groove to be approximately flat.

[0099] Furthermore, in the above embodiment, an example was given of a form in which the anti-vibration device 20 is used to prevent axial wobble of the cutter 72, but the present invention is not limited to this, and in cases where the anti-vibration device 20 cannot be installed, axial wobble may be prevented by using only a guide material such as the guide material 28.

[0100] Furthermore, in the above embodiment, the drilling device 1 is exemplified as forming the drilling portion 2c in a part of the outer circumferential surface of the fluid pipe 2 to allow communication between the fluid pipe 2 and the branch pipe 6, but the present invention is not limited to this, and for example, the drilling device of the present invention may be used to form a drilling portion for cutting a predetermined portion of the fluid pipe 2. In this case, the predetermined portion of the fluid pipe can be cut by using the drilling device of the present invention to form drilling portions that communicate with each other on both radial sides of the outer circumferential surface of the fluid pipe. [Explanation of symbols]

[0101] 1 Drilling device 2 Fluid tube 2a Specific part 2b intercept 2c Perforation 2d non-specific part 3a, 3b Main pipe section (case body) 4 Branch pipe section 4a Branch hole (case body) 5 Body (case body) 6 Branch Pipe 8 Short pipe (case body) 20. Vibration prevention device 21 pedestal plate 22 cradle body 23 Guide tube (guide member) 24 Steady-stop jig (first support member) 25 Steady-stop jig (second support member) 24c,25c support arm 24d,25d Fixed piece 24e, 25e Plate (first member) 24f, 25f Angle iron (second member) 24g, 25g Tip surface (fixed part) 28 Guide material 28a Horizontal board 28b vertical board 28c Top surface (flat surface) 28h Cut end surface 30 Case body 40 On-off valve device 50 Gate valve device 70 Drive mechanism 71 Mounting flange cylinder (case body) 72 cutter 72a hole saw 72b Shaft member 72c cutting blade (perforating blade) 73 Advancement / retraction mechanism 74 Locking member (locking means) 74b Stop ring 80 Extraction jig N2 Screw member (connection means)

Claims

1. A drilling device comprising: a case body that is attached in a sealed manner to the outer surface of a fluid pipe; and a cylindrical cutter that is rotatable and axially movable and has a shaft member at its center, wherein the cutter is moved within the case body so that the shaft member is directed in a direction that does not intersect with the pipe axis of the fluid pipe, thereby forming a perforation in the outer surface of the fluid pipe, a guide member provided in the case body and configured to guide the shaft member in a movement direction of the cutter when the cutter performs drilling; a support member fixed to a specific portion of the outer surface of the fluid pipe that is to be cut off by the cutter, and supporting the guide member.

2. The drilling device according to claim 1, characterized in that the support member has at least a first support member provided on the drilling start side of the cutter in the specific portion, and a second support member provided on the drilling end side of the cutter in the specific portion.

3. The drilling device according to claim 1 , wherein the support member has a pair of fastening portions that are fastened to both sides of the specific portion in the axial direction of the fluid pipe.

4. The drilling device described in claim 1, characterized in that the support member has a first member arranged on the guide member side, a second member arranged on the specific part side of the first member, and a connecting means capable of connecting and disconnecting the first member and the second member.

5. 5. The drilling device according to claim 1, wherein the support member is a recovery member that recovers a piece cut off from the fluid pipe by the cutter.

6. 6. The drilling device according to claim 5, further comprising a locking means for locking the guide member to the shaft member.

7. The drilling device according to claim 6, characterized in that the bottom of the case body is provided with a receiving tray that supports the guide member in an upright position and can close the opening of the cutter after drilling the outer surface of the fluid pipe.

8. 2. The drilling device according to claim 1, wherein the shaft member is guided by the guide member before drilling by the cutter is started.

9. a guide member having a flat surface that can be cut by the cutter on an outer surface that forms a curved circumferential surface of the fluid pipe; 2. The drilling device according to claim 1, wherein the guide member is fixed so that the flat surface is substantially perpendicular to the moving direction of the cutter.

10. The drilling device according to claim 9 , wherein the guide member is fixed so as to straddle the specific portion on the outer surface of the fluid pipe and a non-specific portion surrounding the specific portion.

Images