Fixture

Abstract

To provide a fixture capable of fixing a tubular member irrespective of shapes of end edges of both ends of the tubular member and cutting the tubular member along a longitudinal direction.SOLUTION: A fixture 1 is for cutting a tubular member 10 along a longitudinal direction. The fixture 1 comprises a first fixing unit 2, a second fixing unit 3, a first frame 4, a second frame 5, and a connection member 6. The first fixing unit 2 comprises: a first inner support 21 that can abut against an inner peripheral surface 13 of the tubular member 10 at one end 11 of the tubular member 10; and a first outer support 22 that can abut against an outer peripheral surface 14 of the tubular member 10 at the one end 11 of the tubular member 10. The second fixing unit 3 comprises: a second inner support 31 that can abut against the inner peripheral surface 13 of the tubular member 10 at the other end 12 of the tubular member 10; and a second outer support 32 that can abut against the outer peripheral surface 14 of the tubular member 10 at the other end 12 of the tubular member 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a jig, and more particularly to a jig for cutting a tubular member along its longitudinal direction. [Background technology]

[0002] Conventionally, in decommissioning work of a nuclear facility (for example, a nuclear power plant), the inside of piping used in the reactor is inspected for contamination by radioactive materials before being discarded.

[0003] Specifically, first, the pipe is cut to an arbitrary length in advance, and then the pipe is cut lengthwise (specifically, cut along the longitudinal direction of the pipe) to inspect the inside.

[0004] As an apparatus for cutting a pipe vertically, for example, a pipe vertical cutting and opening apparatus equipped with a cutter has been proposed (for example, see Patent Document 1). In such a pipe vertical cutting and opening apparatus, a pipe is first placed on a press base, and both ends of the pipe are held by clamping them with pipe holding members, and then the pipe is cut vertically with the cutter. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 61-151824 Summary of the Invention [Problem to be solved by the invention]

[0006] On the other hand, in the vertical pipe cutting and opening device of Patent Document 1, both ends of the pipe are held by being sandwiched between pipe holding members, so the pipe cannot be fixed unless the edges of both ends of the pipe have flat surfaces perpendicular to the longitudinal direction of the pipe. Therefore, when cutting the pipe to a desired length, it is necessary to prepare the edges of the cut ends so that they have flat surfaces perpendicular to the longitudinal direction of the pipe, which makes the work complicated.

[0007] The present invention provides a jig that can fix a tubular member and cut the tubular member along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member. [Means for solving the problem]

[0008] The present invention [1] is a jig for cutting a tubular member along the longitudinal direction of the tubular member, the jig comprising: a first fixing means for fixing one end of the tubular member; a second fixing means for fixing the other end of the tubular member; a first frame extending from the first fixing means in a direction intersecting the longitudinal direction; a second frame extending from the second fixing means in a direction intersecting the longitudinal direction; and a connecting member extending in the longitudinal direction and connecting the first frame and the second frame, wherein the first fixing means comprises a first inner support portion at one end of the tubular member that can abut against an inner circumferential surface of the tubular member, and a first outer support portion at one end of the tubular member that can abut against an outer circumferential surface of the tubular member, and the second fixing means comprises a second inner support portion at the other end of the tubular member that can abut against an inner circumferential surface of the tubular member, and a second outer support portion at the other end of the tubular member that can abut against the outer circumferential surface of the tubular member.

[0009] According to this configuration, at one end of the tubular member, the first inner support part abuts against the inner circumferential surface of the tubular member and the first outer support part abuts against the outer circumferential surface of the tubular member, and at the other end of the tubular member, the second inner support part abuts against the inner circumferential surface of the tubular member and the second outer support part abuts against the outer circumferential surface of the tubular member. This makes it possible to fix the tubular member and cut it along its longitudinal direction regardless of the shapes of the edges at both ends of the tubular member.

[0010] The present invention [2] provides a method for manufacturing a tubular member having a first fixing member, the first inner support portion including a first inner protrusion extending toward the second fixing means, the first outer support portion including a first outer protrusion extending in parallel with the first inner protrusion at a distance from the first inner protrusion and having a first fixing hole, and a first fixing member inserted into the first fixing hole, the first inner protrusion portion having a portion opposed to the first outer protrusion capable of abutting against an inner circumferential surface of the tubular member, the first fixing member being capable of abutting against an outer circumferential surface of the tubular member by inserting the first fixing member into the first fixing hole, the second inner support portion including a first outer protrusion extending in parallel with the first inner protrusion and having a first fixing hole, the first fixing member being capable of abutting against an outer circumferential surface of the tubular member by inserting the first fixing member into the first fixing hole, The side support portion includes a second inner protrusion extending toward the first fixing means, and the second outer support portion extends parallel to the second inner protrusion at a distance from the second inner protrusion and includes a second outer protrusion having a second fixing hole and a second fixing member inserted into the second fixing hole, and the portion of the second inner protrusion facing the second outer protrusion is capable of abutting against the inner surface of the tubular member, and the second fixing member is capable of abutting against the outer surface of the tubular member by inserting it into the second fixing hole.The jig includes the jig described in [1] above.

[0011] According to this configuration, the tubular member can be more reliably fixed and cut along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member.

[0012] The present invention [3] includes the jig described in [1] or [2] above, wherein the connecting member has an adjustable length in the longitudinal direction.

[0013] According to this configuration, the tubular member can be fixed in place in accordance with the length of the tubular member in the longitudinal direction.

[0014] The present invention [4] includes the jig described in [3] above, wherein the connecting member comprises a first connecting member connected to the first frame and a second connecting member connected to the second frame, and the first connecting member and the second connecting member are configured to be slidable relative to each other.

[0015] According to this configuration, the tubular member can be fixed in place in accordance with the length of the tubular member in the longitudinal direction.

[0016] The present invention [5] includes the jig described in [4] above, in which one of the first connecting member and the second connecting member has a groove extending in the longitudinal direction, and the other has a fixing portion that fits into the groove.

[0017] According to this configuration, the tubular member can be fixed in place in accordance with the length of the tubular member in the longitudinal direction. Effect of the Invention

[0018] According to the jig of the present invention, it is possible to fix a tubular member and cut the tubular member along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 shows a schematic diagram of one embodiment of a jig of the present invention. [Diagram 2] FIG. 2 shows an enlarged view of a first fixing unit of the jig of FIG. [Diagram 3] FIG. 3 shows an enlarged view of a connecting member of the jig of FIG. [Figure 4] 4A to 4D show an embodiment of a method of using the jig of FIG. 1. FIG. 4A shows a first step of preparing the jig. FIG. 4B shows a second step of adjusting the longitudinal length of the connecting member to abut the first inner support part against the inner circumferential surface of the tubular member at one end of the tubular member, and to abut the second inner support part against the inner circumferential surface of the tubular member at the other end of the tubular member. FIG. 4C shows a third step of abutting the first outer support part against the outer circumferential surface of the tubular member at one end of the tubular member, and to abut the second outer support part against the outer circumferential surface of the tubular member at the other end of the tubular member. FIG. 4D shows a fourth step of cutting the tubular member along its longitudinal direction. [Diagram 5]5A and 5B are schematic diagrams for explaining a method for fixing a tubular member (a tubular member in which both end edges do not have flat surfaces perpendicular to the longitudinal direction). Fig. 5A is a schematic diagram for explaining a method for fixing a tubular member using a conventional pipe vertical slitting device. Fig. 5B is a schematic diagram for explaining a method for fixing a tubular member using the jig of Fig. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] An embodiment of the jig of the present invention will be described with reference to FIG.

[0021] In FIG. 1, the up-down direction of the paper is the up-down direction (the short-side direction of the tubular member (hereinafter, sometimes referred to as the first direction)), the upper side of the paper is the upper side (one side of the first direction), and the lower side of the paper is the lower side (the other side of the first direction). The left-right direction of the paper is the direction perpendicular to the up-down direction and is the left-right direction (the longitudinal direction of the tubular member (hereinafter, sometimes referred to as the second direction)). The right side of the paper is the right side (one side of the second direction), and the left side of the paper is the left side (the other side of the second direction). Specifically, this is in accordance with the directional arrows in each figure. The depth direction is the direction perpendicular to the up-down direction and the left-right direction (hereinafter, sometimes referred to as the third direction). The front side of the paper is the front side (one side of the third direction), and the back side of the paper is the back side (the other side of the third direction).

[0022] <Jig> The jig 1 is a jig for cutting the tubular member 10 along the longitudinal direction of the tubular member 10.

[0023] The tubular member 10 is not particularly limited as long as it is a member having a tubular shape. In other words, the cross-sectional shape of the tubular member 10 is not particularly limited. Examples of the cross-sectional shape include a rectangular shape, a square shape, a circular shape, and an elliptical shape.

[0024] The shape of the edges at both ends of the tubular member 10 is not particularly limited. More specifically, examples of the shape of the edges of the tubular member 10 include flat surfaces and uneven surfaces. These surfaces may be perpendicular to the longitudinal direction of the tubular member 10 or inclined relative to the longitudinal direction of the tubular member 10. The shape of one end 11 and the shape of the other end 12 of the tubular member 10 may be the same or different from each other. In FIG. 1, the edges at both ends of the tubular member 10 have flat surfaces perpendicular to the longitudinal direction.

[0025] Furthermore, as will be described in more detail below, the jig 1 makes it possible to fix the tubular member 10 and cut the tubular member 10 along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member 10.

[0026] The material constituting the tubular member 10 is not particularly limited, and examples thereof include metals and resins. Examples of metals include iron, copper, and aluminum. Examples of resins include polyolefin resins and polyester resins.

[0027] A preferred example of such a tubular member 10 is a pipe used in a nuclear reactor.

[0028] The length of the tubular member 10 in the longitudinal direction is, for example, 10 cm to 100 cm.

[0029] The length of the tubular member 10 in the short side direction (when the cross-sectional shape of the tubular member 10 is circular, the outer diameter) is, for example, 34.0 mm to 89.1 mm.

[0030] The weight of the jig 1 is, for example, 5 kg or less, preferably 3 kg or less, and typically 1 kg or more.

[0031] If the weight of the jig 1 is equal to or less than the above upper limit, it is highly portable, and therefore the jig 1 can be carried to a work site and used there.

[0032] The jig 1 includes a first fixing unit 2 as a first fixing means, a second fixing unit 3 as a second fixing means, a first frame 4, a second frame 5, and a connecting member 6.

[0033] [First fixed unit] The first fixing unit 2 fixes one end 11 of the tubular member 10 .

[0034] The first fixing unit 2 includes a first inner support portion 21 and a first outer support portion 22 .

[0035] The first inner support portion 21 is capable of abutting against the inner circumferential surface 13 of the tubular member 10 at one end 11 of the tubular member 10. Specifically, as shown in FIG.

[0036] The first inner protrusion 23 has a rod-like shape (rectangular column shape). The first inner protrusion 23 extends from one end of the first frame 4 (described later) on one side in the first direction toward the second fixing unit 3. Specifically, the first inner protrusion 23 protrudes in a bent manner from one end of the first frame 4 (described later) on one side in the first direction toward the inside in the opposing direction (second direction) between the first frame 4 (described later) and the second frame 5 (described later).

[0037] The length of the first inner protrusion 23 (the length in the second direction) is, for example, 1 cm to 2 cm.

[0038] The thickness (length in the first direction) of the first inner protrusion 23 is shorter than half the length of the tubular member 10 in the short side direction, and is, for example, 0.5 cm to 1 cm.

[0039] The first outer support portion 22 is capable of abutting against the outer circumferential surface 14 of the tubular member 10 at one end 11 of the tubular member 10. Specifically, the first outer support portion 22 includes a first outer protrusion 24 and a first fixing member 25.

[0040] The first outer protrusion 24 has a rod-like shape (rectangular column shape). The first outer protrusion 24 extends from the first frame 4 (described later) in parallel with and at an interval from the first inner protrusion 23. Specifically, the first outer protrusion 24 protrudes from the first frame 4 (described later) toward the inside in the opposing direction (second direction) between the first frame 4 (described later) and the second frame 5 (described later) at a position spaced apart on the other side in the first direction from the first inner protrusion 23.

[0041] The length of the first outer protrusion 24 (the length in the second direction) is longer than the length of the first inner protrusion 23.

[0042] The first outer protrusion 24 has a first fixing hole 26 penetrating in the first direction at one end in the second direction. The first fixing hole 26 has a threaded inner periphery.

[0043] The first fixing member 25 includes a first screw 27 and a first receiving portion .

[0044] The first screw 27 is a wing screw. The first screw 27 is inserted through the first fixing hole 26 and screwed in such a way that the head of the first screw 27 faces the other side in the first direction and the tip of the first screw 27 faces the one side in the first direction.

[0045] The first receiving portion 28 includes a first base portion 28A and a first swing portion 28B.

[0046] The first pedestal portion 28A includes a fitting portion 28a and a lower connecting portion 28b.

[0047] A screw hole that is open to the other side in the first direction is provided on the lower surface of the fitting portion 28a. The tip of the first screw 27 is screwed into the screw hole.

[0048] The lower connecting portion 28b protrudes in a generally spherical shape from the center of the upper surface of the fitting portion 28a toward one side in the first direction.

[0049] The first swivel portion 28B includes an upper connecting portion 28c and a contact portion 28d.

[0050] The lower surface of the upper connecting portion 28c is provided with a hole that is open to the other side in the first direction and corresponds to the lower connecting portion 28b. The lower connecting portion 28b slidably fits into the hole (forms a universal joint).

[0051] The contact portion 28d protrudes in a Y shape from the upper surface of the upper connecting portion 28c.

[0052] Further, a facing portion 29 of the first inner protrusion 23 facing the first outer protrusion 24 is capable of abutting against the inner circumferential surface 13 of the tubular member 10 .

[0053] Furthermore, by inserting the first fixing member 25 into the first fixing hole 26, the first fixing member 25 can abut against the outer peripheral surface 14 of the tubular member 10. Specifically, by threading the first screw 27 of the first fixing member 25 into the first fixing hole 26, the first receiving portion 28 faces one side in the first direction and can abut against the outer peripheral surface 14 of the tubular member 10.

[0054] [Second fixed unit] The second fixing unit 3 fixes the other end 12 of the tubular member 10 .

[0055] The second fixing unit 3 includes a second inner support portion 31 and a second outer support portion 32 .

[0056] The second inner support portion 31 is capable of abutting against the inner circumferential surface 13 of the tubular member 10 at the other end 12 of the tubular member 10. Specifically, the second inner support portion 31 includes a second inner protrusion 33.

[0057] The second inner protrusion 33 has a rod-like shape (rectangular column shape). The second inner protrusion 33 extends from one end of the second frame 5 (described later) in the first direction toward the first fixing unit 2. Specifically, the second inner protrusion 33 protrudes in a bent manner from one end of the second frame 5 (described later) in the first direction toward the inside in the opposing direction (second direction) of the second frame 5 (described later) and the first frame 4 (described later).

[0058] The length of the second inner protrusion 33 (length in the second direction) is, for example, 1 cm to 2 cm. The length of the second inner protrusion 33 is the same as the length of the first inner protrusion 23.

[0059] The thickness (length in the first direction) of the second inner protrusion 33 is shorter than half the length in the short side direction of the tubular member 10, and is, for example, 0.5 cm to 1 cm. In addition, the thickness of the second inner protrusion 33 is the same as the thickness of the first inner protrusion 23.

[0060] The second outer support portion 32 is capable of abutting against the outer circumferential surface 14 of the tubular member 10 at the other end 12 of the tubular member 10. Specifically, the second outer support portion 32 includes a second outer protrusion 34 and a second fixing member 35.

[0061] The second outer protrusion 34 has a rod-like shape (rectangular column shape). The second outer protrusion 34 extends from the second frame 5 (described later) in parallel with and at an interval from the second inner protrusion 33. Specifically, the second outer protrusion 34 protrudes from the second frame 5 (described later) toward the inside in the opposing direction (second direction) between the second frame 5 (described later) and the first frame 4 (described later) at a position spaced apart on the other side in the first direction from the second inner protrusion 33.

[0062] The length of the second outer protrusion 34 (the length in the second direction) is longer than the length of the second inner protrusion 33.

[0063] The second outer protrusion 34 has a second fixing hole 36 penetrating in the first direction at the other end in the second direction. The second fixing hole 36 has a threaded inner periphery.

[0064] The second fixing member 35 includes a second screw 37 and a second receiving portion 38 .

[0065] The second screw 37 is a wing screw. The second screw 37 is inserted through the second fixing hole 36 and screwed in such a way that the head of the second screw 37 faces the other side in the first direction and the tip of the second screw 37 faces the one side in the first direction.

[0066] The second receiving portion 38 includes the same members as the first receiving portion 28. Specifically, the second receiving portion 38 includes a second pedestal portion (not shown) and a second swivel portion (not shown).

[0067] The second base portion includes a fitting portion and a lower connecting portion.

[0068] A screw hole that is open to the other side in the first direction is provided on the lower surface of the fitting portion. A tip end of a second screw 37 is screwed into the screw hole.

[0069] The lower connecting portion protrudes in a generally spherical shape from a central portion of the upper surface of the fitting portion toward one side in the first direction.

[0070] The second swivel portion includes an upper connecting portion and an abutment portion.

[0071] The lower surface of the upper connecting portion is provided with a hole that is open to the other side in the first direction and corresponds to the lower connecting portion. The lower connecting portion slidably fits into the hole (universal joint).

[0072] The abutment portion protrudes in a Y shape from the upper surface of the upper connecting portion.

[0073] A facing portion 39 of the second inner protrusion 33 facing the second outer protrusion 34 is capable of abutting against the inner circumferential surface 13 of the tubular member 10 .

[0074] Furthermore, by inserting the second fixing member 35 into the second fixing hole 36, the second fixing member 35 can abut against the outer peripheral surface 14 of the tubular member 10. Specifically, by threading the second screw 37 of the second fixing member 35 into the second fixing hole 36, the second receiving portion 38 faces one side in the first direction and can abut against the outer peripheral surface 14 of the tubular member 10.

[0075] [1st frame] The first frame 4 has a rod-like shape (a rectangular column shape).

[0076] The first frame 4 extends from the first fixing unit 2 in a direction (first direction) intersecting (orthogonal to) the longitudinal direction of the tubular member 10.

[0077] A first inner support part 21 is connected to one end of the first frame 4 in the first direction, a first connecting member 41 (described later) is connected to the other end of the first frame 4 in the first direction, and a first outer support part 22 is connected to the other side in the first direction of the first inner support part 21 and to one side in the first direction of the first connecting member 41 (described later).

[0078] The length of the first frame 4 (the length in the first direction) is, for example, 20 cm to 30 cm.

[0079] [2nd frame] The second frame 5 has a rod-like shape (a rectangular column shape).

[0080] The second frame 5 extends from the second fixing unit 3 in a direction (first direction) intersecting (orthogonal) the longitudinal direction of the tubular member 10. Specifically, the second frame 5 is parallel to and spaced apart from the first frame 4 in the second direction.

[0081] A second inner support part 31 is connected to one end of the second frame 5 in the first direction, and a second connecting member 42 (described later) is connected to the other end of the second frame 5 in the first direction, and a second outer support part 32 is connected on the other side in the first direction of the second inner support part 31 and on one side in the first direction of the second connecting member 42 (described later).

[0082] The length of the second frame 5 (the length in the first direction) is the same as the length of the first frame 4.

[0083] [Connecting parts] The connecting member 6 extends in the second direction and connects the first frame 4 and the second frame 5 together.

[0084] The connecting member 6 includes a first connecting member 41 and a second connecting member 42. The first connecting member 41 and the second connecting member 42 are configured to be slidable relative to each other.

[0085] The first connecting member 41 has a flat plate shape that expands in a direction perpendicular to the first direction. The first connecting member 41 is connected to the other end of the first frame 4 in the first direction. The first connecting member 41 extends from the other end of the first frame 4 in the first direction toward one side in the second direction. As shown in FIG. 3, the first connecting member 41 has a groove 43 that extends in the second direction. The groove 43 is an elongated hole that occupies most of the center of the first connecting member 41.

[0086] The second connecting member 42 has a flat plate shape that expands in a direction perpendicular to the first direction. The second connecting member 42 is connected to the other end of the second frame 5 in the first direction. The second connecting member 42 extends from the other end of the second frame 5 in the first direction toward the other side in the second direction. The length of the first connecting member 41 in the second direction and the length of the second connecting member 42 in the second direction are the same.

[0087] The second connecting member 42 has a fixing portion 44 in the second direction.

[0088] The fixing portion 44 has a male screw 44a and a female screw 44b. The male screw 44a is a screw that protrudes from the second connecting member 42 to one side in the first direction. The female screw 44b is a butterfly screw that screws into the male screw 44a. Because the male screw 44a protrudes from the second connecting member 42 to one side in the first direction, after one side of the tubular member 10 is cut, the jig 1 can be turned over and the other side cut.

[0089] The second connecting member 42 and the first connecting member 41 are overlapped toward one side in the first direction. In this state, the male screw 44a protrudes from the groove 43 toward one side in the first direction. That is, the fixing portion 44 is fitted into the groove 43. The female screw 44b is screwed into the male screw 44a.

[0090] Then, by loosening the female screw 44b of the fixing portion 44, the first connecting member 41 and the second connecting member 42 are allowed to slide (move in the second direction), while by tightening the female screw 44b of the fixing portion 44, the sliding (movement in the second direction) of the first connecting member 41 and the second connecting member 42 is fixed. This makes it possible for the connecting member 6 to adjust its length in the second direction to match the length of the tubular member 10 in the longitudinal direction.

[0091] <How to use the jig> 4A to 4D, one embodiment of a method of using the jig (specifically, a method of cutting a tubular member along its longitudinal direction using the jig) will be described.

[0092] A method of using the jig includes a first step of preparing the jig 1; a second step of adjusting the longitudinal length of the connecting member 6 to abut the first inner support part 21 against the inner surface 13 of the tubular member 10 at one end 11 of the tubular member 10, and to abut the second inner support part 31 against the inner surface 13 of the tubular member 10 at the other end 12 of the tubular member 10; a third step of abutting the first outer support part 22 against the outer surface 14 of the tubular member 10 at one end 11 of the tubular member 10, and to abut the second outer support part 32 against the outer surface 14 of the tubular member 10 at the other end 12 of the tubular member 10; and a fourth step of cutting the tubular member 10 along its longitudinal direction.

[0093] [1st step] In the first step, a jig 1 is prepared as shown in FIG. 4A.

[0094] [Second process] In the second step, as shown in FIG. 4B, the longitudinal length of the connecting member 6 is adjusted so that the first inner support portion 21 abuts against the inner surface 13 of the tubular member 10 at one end 11 of the tubular member 10, and the second inner support portion 31 abuts against the inner surface 13 of the tubular member 10 at the other end 12 of the tubular member 10.

[0095] In the second step, first, the length of the connecting member 6 in the longitudinal direction is adjusted. Specifically, first, the female screw 44b in the fixing portion 44 is loosened to slide the first connecting member 41 and the second connecting member 42, and the length of the connecting member 6 in the second direction is adjusted to match the length of the tubular member 10 in the longitudinal direction (second direction), and then the female screw 44b in the fixing portion 44 is tightened to fix the sliding (movement in the second direction) of the first connecting member 41 and the second connecting member 42. In this way, the length of the tubular member 10 in the longitudinal direction (second direction) is adjusted by the connecting member 6, and the length of the second direction between the first frame 4 and the second frame 5 is fixed to match the length of the tubular member 10 in the longitudinal direction.

[0096] At this time, the first inner support portion 21 abuts against the inner surface 13 of the tubular member 10 at one end 11 of the tubular member 10, and the second inner support portion 31 abuts against the inner surface 13 of the tubular member 10 at the other end 12 of the tubular member 10.

[0097] [3rd step] In the third step, as shown in FIG. 4C, a first outer support part 22 is abutted against the outer peripheral surface 14 of the tubular member 10 at one end 11 of the tubular member, and a second outer support part 32 is abutted against the outer peripheral surface 14 of the tubular member 10 at the other end 12 of the tubular member 10.

[0098] Specifically, at one end 11 of the tubular member, a first screw 27 in a first fixing member 25 is screwed in, thereby moving the first fixing member 25 from the other side in the first direction to the one side in the first direction, and a first receiving portion 28 in the first fixing member 25 is brought into contact with an outer circumferential surface 14 of the tubular member 10, and at the other end 12 of the tubular member, a second screw 37 in a second fixing member 35 is screwed in, thereby moving the second fixing member 35 from the other side in the first direction to the one side in the first direction, and a second receiving portion 38 in the second fixing member 35 is brought into contact with an outer circumferential surface 14 of the tubular member 10. In this way, the jig 1 clamps the tubular member 10 from the inside (inner circumferential surface 13) and the outside (outer circumferential surface 14) of the tubular member 10.

[0099] [4th step] In a fourth step, as shown in FIG. 4D, the tubular member 10 is cut along its longitudinal direction.

[0100] Specifically, the jig 1 is fixed, for example, with a vice, and then the tubular member 10 is cut along its longitudinal direction using a cutting device such as a band saw.

[0101] <Action and effect> (1) According to the jig 1, at one end 11 of the tubular member 10, the first inner support portion 21 abuts against the inner circumferential surface 13 of the tubular member 10 and the first outer support portion 22 abuts against the outer circumferential surface 14 of the tubular member 10, and at the other end 12 of the tubular member 10, the second inner support portion 31 abuts against the inner circumferential surface 13 of the tubular member 10 and the second outer support portion 32 abuts against the outer circumferential surface 14 of the tubular member 10. This makes it possible to fix the tubular member 10 and cut the tubular member 10 along its longitudinal direction, regardless of the shapes of the edges at both ends of the tubular member 10.

[0102] More specifically, conventionally, in decommissioning work of a nuclear facility (for example, a nuclear power plant), the inside of the piping used in the reactor is inspected for contamination by radioactive materials before being discarded.

[0103] Specifically, first, the pipe is cut to an arbitrary length in advance, and then the pipe is cut lengthwise (specifically, cut along the longitudinal direction of the pipe) to inspect the inside.

[0104] A vertical pipe cutting and opening device has been proposed in Patent Document 1 as a device for cutting a pipe vertically. In the vertical pipe cutting and opening device of Patent Document 1, as shown in FIG. 5A, a tubular member 10 is placed on a press base 51, both ends of the tubular member 10 are held by being sandwiched between pipe holding members 52, and then the tubular member 10 is cut vertically by a cutter. However, in this vertical pipe cutting and opening device, since both ends of the tubular member 10 are held by being sandwiched between the pipe holding members 52, the tubular member 10 cannot be fixed unless the edges of both ends of the tubular member 10 have flat surfaces perpendicular to the longitudinal direction of the tubular member 10 (in FIG. 5A, the edges of both ends of the tubular member 10 have flat surfaces inclined with respect to the longitudinal direction of the tubular member 10). Therefore, when cutting the tubular member 10 to an arbitrary length, it is necessary to arrange the edges of the cut ends so that they have flat surfaces perpendicular to the longitudinal direction of the tubular member 10, which is a problem in that the work becomes complicated.

[0105] On the other hand, according to the jig 1, at one end 11 of the tubular member 10, the first inner support part 21 abuts against the inner circumferential surface 13 of the tubular member 10, and the first outer support part 22 abuts against the outer circumferential surface 14 of the tubular member 10, and at the other end 12 of the tubular member 10, the second inner support part 31 abuts against the inner circumferential surface 13 of the tubular member 10, and the second outer support part 32 abuts against the outer circumferential surface 14 of the tubular member 10. In other words, according to the jig 1, the tubular member 10 is supported at the portion where the first inner support part 21, the first outer support part 22, the second inner support part 31, and the second outer support part 32 abut. Therefore, even if the edges of both ends of the tubular member 10 have flat surfaces that are inclined with respect to the longitudinal direction of the tubular member 10 as shown in FIG. 5B, the tubular member 10 can be fixed and cut along its longitudinal direction. As a result, workability is improved.

[0106] (2) According to the jig 1, the first inner support portion 21 has a first inner protrusion 23, and the first outer support portion 22 extends parallel to the first inner protrusion 23 at a distance from the first inner protrusion 23 and has a first outer protrusion 24 having a first fixing hole 26, and a first fixing member 25 inserted into the first fixing hole 26, and the opposing portion 29 of the first inner protrusion 23 facing the first outer protrusion 24 is able to abut against the inner surface 13 of the tubular member 10, and by inserting the first fixing member 25 into the first fixing hole 26, the first fixing member 25 is able to abut against the outer surface 14 of the tubular member 10. In addition, the second inner support portion 31 has a second inner protrusion 33 extending toward the first fixing unit 2, and the second outer support portion 32 extends parallel to the second inner protrusion 33 at a distance and has a second outer protrusion 34 having a second fixing hole 36, and a second fixing member 35 inserted into the second fixing hole 36, and the opposing portion 39 of the second inner protrusion 33 facing the second outer protrusion 34 is able to abut against the inner surface 13 of the tubular member 10, and by inserting the second fixing member 35 into the second fixing hole 36, the second fixing member 35 is able to abut against the outer surface 14 of the tubular member 10.

[0107] This makes it possible to more reliably fix the tubular member 10 and cut the tubular member 10 along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member 10.

[0108] (3) According to the jig 1, the length of the connecting member 6 in the longitudinal direction is adjustable.

[0109] This allows the tubular member 10 to be fixed in place in accordance with the length of the tubular member 10 in the longitudinal direction.

[0110] (4) According to the jig 1, the connecting member 6 includes a first connecting member 41 connected to the first frame 4 and a second connecting member 42 connected to the second frame 5, and the first connecting member 41 and the second connecting member 42 are configured to be slidable relative to each other.

[0111] This allows the tubular member 10 to be fixed in place in accordance with the length of the tubular member 10 in the longitudinal direction.

[0112] (5) According to the jig 1 , the second connecting member 42 has the groove 43 , and the first connecting member 41 has the fixing portion 44 that fits into the groove 43 .

[0113] This allows the tubular member 10 to be fixed in place in accordance with the length of the tubular member 10 in the longitudinal direction.

[0114] <Modification> In the modified example, the same reference numerals are used for the same components and steps as those in the first embodiment, and detailed descriptions thereof will be omitted. In addition, the modified example can achieve the same effects as those in the first embodiment unless otherwise specified. Furthermore, the first embodiment and its modified example can be appropriately combined.

[0115] In the above description, the second connecting member 42 has a groove 43 and the first connecting member 41 has a fixing portion 44, but the first connecting member 41 may also have a groove 43 and the second connecting member 42 may also have a fixing portion 44.

[0116] That is, one of the first connecting member 41 and the second connecting member 42 has a groove 43 , and the other has a fixing portion 44 that fits into the groove 43 .

[0117] In the above description, the first fixing member 25 includes the first screw 27 and the first receiving portion 28, but the first fixing member 25 may be composed of only the first screw 27 without including the first receiving portion 28. In such a case, as the first screw 27 advances, the tip of the first screw 27 comes into contact with the outer circumferential surface 14 of the tubular member 10. The same applies to the second fixing member 35. [Explanation of symbols]

[0118] 1 Jig 2 First fixed unit 3 Second fixed unit 4 First Frame 5. Second Frame 6 Connecting members 10 Tubular member 11 one end 12 Other end 13 Inner Surface 14 Outer Surface 21 First medial support 22 First outer support 23 First inner protrusion 24 1st outer protrusion 25 1st fixed member 26 1st fixed point 31 Second medial support 32 Second outer support 33 Second inner protrusion 34 Second outer protrusion 35 2nd fixed member 36 2nd fixed point 41 1st connecting member 42 Second connecting member 43 Groove 44 Fixed part

Claims

1. A tool for cutting a tubular member along a longitudinal direction of the tubular member, a first fastening means for fastening one end of the tubular member; A second fixing means for fixing the other end of the tubular member; a first frame extending from the first fixing means in a direction intersecting the longitudinal direction; a second frame extending from the second fixing means in a direction intersecting the longitudinal direction; a connecting member extending in the longitudinal direction and connecting the first frame and the second frame, the first fixing means includes a first inner support portion capable of contacting an inner circumferential surface of the tubular member at one end of the tubular member, and a first outer support portion capable of contacting an outer circumferential surface of the tubular member at one end of the tubular member, The second fixing means is a jig comprising a second inner support portion at the other end of the tubular member, the second inner support portion being capable of abutting against the inner surface of the tubular member, and a second outer support portion at the other end of the tubular member, the second outer support portion being capable of abutting against the outer surface of the tubular member.

2. the first inner support includes a first inner protrusion extending toward the second fastening means; The first outer support portion includes a first outer protrusion extending in parallel with the first inner protrusion at a distance from the first inner protrusion and having a first fixing hole, and a first fixing member inserted into the first fixing hole, a portion of the first inner protrusion facing the first outer protrusion capable of contacting an inner circumferential surface of the tubular member, the first fixing member is capable of contacting an outer circumferential surface of the tubular member by inserting the first fixing member into the first fixing hole, the second inner support includes a second inner protrusion extending toward the first fastening means; The second outer support portion includes a second outer protrusion extending in parallel with the second inner protrusion at an interval and having a second fixing hole, and a second fixing member inserted into the second fixing hole, a portion of the second inner protrusion facing the second outer protrusion capable of contacting an inner circumferential surface of the tubular member, The jig according to claim 1 , wherein the second fixing member is capable of contacting an outer circumferential surface of the tubular member by inserting the second fixing member through the second fixing hole.

3. The jig according to claim 1 or 2, wherein the length of the connecting member in the longitudinal direction is adjustable.

4. the connecting member includes a first connecting member connected to the first frame and a second connecting member connected to the second frame, The jig according to claim 3 , wherein the first connecting member and the second connecting member are configured to be slidable relative to each other.

5. The jig according to claim 4 , wherein one of the first connecting member and the second connecting member has a groove extending in the longitudinal direction, and the other has a fixing portion that fits into the groove.

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