JP7422445B1 - jig - Google Patents

Abstract

An object of the present invention is to provide a jig capable of fixing a tubular member and cutting the tubular member along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member.
A jig 1 is a jig for cutting a tubular member 10 along the longitudinal direction. The jig 1 includes a first fixing unit 2, a second fixing unit 3, a first frame 4, a second frame 5, and a connecting member 6. The first fixing unit 2 includes a first inner support portion 21 that can come into contact with the inner circumferential surface 13 of the tubular member 10 at one end 11 of the tubular member 10, and a first inner support portion 21 that can come into contact with the inner circumferential surface 14 of the tubular member 10 at the one end 11 of the tubular member 10. The first outer support portion 22 is abuttable. The second fixing unit 3 includes a second inner support portion 31 that can come into contact with the inner circumferential surface 13 of the tubular member 10 at the other end 12 of the tubular member 10, and an outer circumferential surface of the tubular member 10 at the other end 12 of the tubular member 10. 14.
[Selection diagram] Figure 1

Description

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

BACKGROUND ART Conventionally, in decommissioning work for nuclear facilities (for example, nuclear power plants), piping used in nuclear reactors is inspected for contamination by radioactive materials before being disposed of.

Specifically, first, the pipe is cut to an arbitrary length, and then the pipe is cut vertically (more specifically, along the longitudinal direction of the pipe), and the inside thereof is inspected.

As a device for vertically cutting pipes, for example, a pipe vertical cutting device including a cutter has been proposed (see, for example, Patent Document 1). In such a pipe vertical cutting device, first, a pipe is placed on a press base, both ends of the pipe are held between pipe holding members, and then the pipe is vertically cut using a cutter.

Utility Model Publication No. 61-151824

On the other hand, in the vertical pipe cutting device of Patent Document 1, since both ends of the pipe are held between pipe holding members, the edges of both ends of the pipe have flat surfaces perpendicular to the longitudinal direction of the pipe. Otherwise, the pipe cannot be fixed. Therefore, when cutting the pipe to a desired length, it is necessary to prepare the cut edge so that it has a flat surface perpendicular to the longitudinal direction of the pipe, which makes the work complicated.

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.

The present invention [1] is a jig for cutting a tubular member along the longitudinal direction of the tubular member, the jig including a first fixing means for fixing one end of the tubular member, and the other end of the tubular member. a first frame extending from the first fixing means in a direction intersecting the longitudinal direction; and 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 being able to abut on the inner circumferential surface of the tubular member at one end of the tubular member. and a first outer support portion capable of abutting against the outer circumferential surface of the tubular member at one end of the tubular member, and the second fixing means includes, at the other end of the tubular member, A jig comprising: a second inner support part that can come into contact with the inner peripheral surface of the tubular member; and a second outer support part that can come into contact with the outer peripheral surface of the tubular member at the other end of the tubular member. be.

According to such a configuration, at one end of the tubular member, the first inner support portion contacts the inner peripheral surface of the tubular member, and the first outer support portion contacts the outer peripheral surface of the tubular member, and the other end of the tubular member At the end, the second inner support portion abuts against the inner circumferential surface of the tubular member, and the second outer support portion abuts against the outer circumferential surface of the tubular member. Thereby, the tubular member can be fixed and cut along its longitudinal direction regardless of the shape of the edges at both ends of the tubular member.

In the present invention [2], the first inner support portion includes a first inner protrusion extending toward the second fixing means, and the first outer support portion is spaced apart from the first inner protrusion. a first outer protrusion extending in parallel with each other and having a first fixing hole; and a first fixing member inserted into the first fixing hole; The opposing portion can come into contact with the inner circumferential surface of the tubular member, and by inserting the first fixing member into the first fixing hole, the first fixing member comes into contact with the outer circumferential surface of the tubular member. the second inner support portion includes a second inner protrusion extending toward the first fixing means, and the second outer support portion is spaced apart from and parallel to the second inner protrusion. a second outer protrusion that extends as shown in FIG. is capable of contacting the inner circumferential surface of the tubular member, and by inserting the second fixing member into the second fixing hole, the second fixing member is able to abut the outer circumferential surface of the tubular member. The jig described in [1] above is included.

According to such a configuration, the tubular member can be fixed more reliably and the tubular member can be cut along its longitudinal direction, regardless of the shapes of the edges at both ends of the tubular member.

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

According to such a configuration, the tubular member can be fixed according to the length of the tubular member in the longitudinal direction.

In the present invention [4], the connecting member includes a first connecting member connected to the first frame, and a second connecting member connected to the second frame, and the connecting member includes the first connecting member and the second connecting member. The two connecting members include the jig described in [3] above, which is configured to be slidable relative to each other.

According to such a configuration, the tubular member can be fixed according to the length of the tubular member in the longitudinal direction.

The present invention [5] provides the above-mentioned [5], wherein one of the first connecting member and the second connecting member is provided with a groove extending in the longitudinal direction, and the other is provided with a fixing portion that fits into the groove. 4] includes the jig described in [4].

According to such a configuration, the tubular member can be fixed according to the length of the tubular member in the longitudinal direction.

According to the jig of the present invention, it is possible to fix the tubular member and cut the tubular member along its longitudinal direction, regardless of the shapes of the edges at both ends of the tubular member.

FIG. 1 shows a schematic diagram of one embodiment of the jig of the present invention. FIG. 2 shows an enlarged view of the first fixing unit of the jig of FIG. 1. FIG. 3 shows an enlarged view of the connecting member of the jig of FIG. 1. FIG. 4A-4D illustrate one embodiment of a method of using the jig of FIG. 1. FIG. FIG. 4A shows the first step of preparing the jig. In FIG. 4B, the length in the longitudinal direction of the connecting member is adjusted so that the first inner support part is brought into contact with the inner circumferential surface of the tubular member at one end of the tubular member, and the first inner support part is brought into contact with the inner circumferential surface of the tubular member at the other end of the tubular member. A second step of bringing the second inner support portion into contact with the inner circumferential surface of the member is shown. In FIG. 4C, a first outer support part is brought into contact with the outer peripheral surface of the tubular member at one end of the tubular member, and a second outer support part is brought into contact with the outer peripheral surface of the tubular member at the other end of the tubular member. The third step is shown below. FIG. 4D shows a fourth step of cutting the tubular member along its longitudinal direction. FIGS. 5A and 5B are schematic diagrams illustrating a method of fixing a tubular member (a tubular member whose edges at both ends do not have flat surfaces perpendicular to the longitudinal direction). FIG. 5A is a schematic diagram illustrating a method of fixing a tubular member using a conventional pipe vertical cutting device. FIG. 5B shows a schematic diagram illustrating a method of fixing a tubular member using the jig shown in FIG. 1.

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

In FIG. 1, the up-down direction in the paper is the up-down direction (the transversal direction of the tubular member (hereinafter sometimes referred to as the first direction)), and the upper side in the paper is the upper side (one side in the first direction), The lower side is the lower side (the other side in the first direction). Further, the left-right direction on the paper surface is a 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 page is the right side (one side in the second direction), and the left side of the page is the left side (the other side in the second direction). Specifically, it conforms to the direction arrows in each figure. Further, the depth direction is a direction (hereinafter sometimes referred to as a third direction) orthogonal to the up-down direction and the left-right direction. The front side of the page is the front side (one side in the third direction), and the back side of the page is the back side (the other side in the third direction).

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

The tubular member 10 is not particularly limited as long as it has a tubular shape. That is, the cross-sectional shape of the tubular member 10 is not particularly limited. Examples of the cross-sectional shape include rectangular, square, circular, and elliptical shapes.

Furthermore, the shapes of the edges at both ends of the tubular member 10 are not particularly limited. Specifically, the shape of the edge of the tubular member 10 includes, for example, a flat surface and an uneven surface. Further, these planes may be perpendicular to the longitudinal direction of the tubular member 10 or may be inclined with respect to the longitudinal direction of the tubular member 10. Further, 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 addition, in FIG. 1, the edges at both ends of the tubular member 10 have flat surfaces perpendicular to the longitudinal direction.

Further, as will be described in detail later, according to the jig 1, the tubular member 10 is fixed and cut along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member 10. be able to.

Further, the material constituting the tubular member 10 is not particularly limited, and examples thereof include metal and resin. Examples of metals include iron, copper, and aluminum. Examples of the resin include polyolefin resin and polyester resin.

Preferably, such a tubular member 10 is a pipe used in a nuclear reactor.

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

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

The weight of the jig 1 is, for example, 5 kg or less, preferably 3 kg or less. Moreover, it is usually 1 kg or more.

If the weight of the jig 1 is less than or equal to the above upper limit, it will be excellent in portability. Therefore, the jig 1 can be carried to the workplace and used there.

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.

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

The first fixing unit 2 includes a first inner support section 21 and a first outer support section 22 .

The first inner support portion 21 can come into contact with the inner circumferential surface 13 of the tubular member 10 at one end 11 of the tubular member 10 . Specifically, as shown in FIG. 2 , the first inner support portion 21 includes a first inner protrusion 23 .

The first inner protrusion 23 has a rod-like shape (prismatic shape). The first inner protrusion 23 extends from one end in the first direction of the first frame 4 (described later) toward the second fixing unit 3 . Specifically, the first inner protrusion 23 extends from one end in the first direction of the first frame 4 (described later) to the opposing direction (described later) between the first frame 4 (described later) and the second frame 5 (described later). (Second direction) Protrudes inward in a curved manner.

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

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 lateral direction, and is, for example, 0.5 cm to 1 cm.

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

The first outer protrusion 24 has a rod-like shape (prismatic shape). The first outer protrusion 24 extends from the first frame 4 (described later) in parallel with the first inner protrusion 23 at a distance. Specifically, the first outer protrusion 24 moves from the first frame 4 (described later) to the first frame 4 (described later) at a position spaced apart from the first inner protrusion 23 on the other side in the first direction. ) and the second frame 5 (described later) inwardly in a direction (second direction) facing each other.

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

The first outer protrusion 24 includes a first fixing hole 26 penetrating in the first direction at one end in the second direction. A thread groove is provided on the inner periphery of the first fixing hole 26.

The first fixing member 25 includes a first screw 27 and a first receiving portion 28 .

The first screw 27 is a thumb screw. The first screw 27 is inserted into the first fixing hole 26 and screwed so that the head of the first screw 27 is on the other side in the first direction and the tip of the first screw 27 is on the one side in the first direction. has been done.

The first receiving portion 28 includes a first pedestal portion 28A and a first swinging portion 28B.

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

A screw hole opened 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.

The lower connecting portion 28b protrudes approximately spherically from the center of the upper surface of the fitting portion 28a toward one side in the first direction.

The first swinging portion 28B includes an upper connecting portion 28c and an abutting portion 28d.

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 is slidably fitted into the hole (universally jointed).

The contact portion 28d projects in a Y-shape from the upper surface of the upper connecting portion 28c.

A portion 29 of the first inner protrusion 23 facing the first outer protrusion 24 can abut against the inner circumferential surface 13 of the tubular member 10 .

Further, by inserting the first fixing member 25 into the first fixing hole 26, the first fixing member 25 can come into contact with the outer peripheral surface 14 of the tubular member 10. Specifically, by screwing the first screw 27 of the first fixing member 25 into the first fixing hole 26, the first receiving part 28 faces toward one side in the first direction, and the outer circumferential surface of the tubular member 10 14.

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

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

The second inner support portion 31 can come into contact with 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 .

The second inner protrusion 33 has a rod-like shape (prismatic shape). The second inner protrusion 33 extends toward the first fixing unit 2 from one end in the first direction of the second frame 5 (described later). Specifically, the second inner protrusion 33 extends from one end in the first direction of the second frame 5 (described later) to the opposing direction (described later) between the second frame 5 (described later) and the first frame 4 (described later). (Second direction) Protrudes inward in a curved manner.

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

The thickness (length in the first direction) of the second inner protrusion 33 is shorter than half the length of the tubular member 10 in the lateral direction, and is, for example, 0.5 cm to 1 cm. Further, the thickness of the second inner protrusion 33 is the same as the thickness of the first inner protrusion 23 described above.

The second outer support portion 32 is capable of contacting the outer peripheral 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 .

The second outer protrusion 34 has a rod-like shape (prismatic shape). The second outer protrusion 34 extends from the second frame 5 (described later) in parallel with the second inner protrusion 33 at a distance. Specifically, the second outer protrusion 34 moves from the second frame 5 (described later) to the second frame 5 (described later) at a position spaced apart from the second inner protrusion 33 on the other side in the first direction. ) and the first frame 4 (described later) inwardly in a direction (second direction) facing each other.

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 .

The second outer protrusion 34 includes a second fixing hole 36 penetrating in the first direction at the other end in the second direction. A threaded groove is provided on the inner periphery of the second fixing hole 36.

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

The second screw 37 is a thumb screw. The second screw 37 is inserted into the second fixing hole 36 and screwed so that the head of the second screw 37 is on the other side in the first direction and the tip of the second screw 37 is on the one side in the first direction. has been done.

The second receiving part 38 includes the same members as the first receiving part 28. Specifically, it includes a second pedestal (not shown) and a second swing part (not shown).

The second pedestal portion includes a fitting portion and a lower connecting portion.

A screw hole opened to the other side in the first direction is provided on the lower surface of the fitting part. The tip of the second screw 37 is screwed into the screw hole.

The lower connecting portion protrudes approximately spherically from the center of the upper surface of the fitting portion toward one side in the first direction.

The second swinging section includes an upper connecting section and an abutting section.

A hole corresponding to the lower connecting portion is provided in the lower surface of the upper connecting portion, and is open to the other side in the first direction. The lower connecting portion slidably fits into the hole (universal joint).

The contact portion projects in a Y-shape from the upper surface of the upper connecting portion.

A portion 39 of the second inner protrusion 33 facing the second outer protrusion 34 can come into contact with the inner circumferential surface 13 of the tubular member 10 .

Further, by inserting the second fixing member 35 into the second fixing hole 36, the second fixing member 35 can come into contact with the outer peripheral surface 14 of the tubular member 10. Specifically, by screwing the second screw 37 of the second fixing member 35 into the second fixing hole 36, the second receiving portion 38 faces toward one side in the first direction, and the second receiving portion 38 faces the outer circumferential surface of the tubular member 10. 14.

[First frame]
The first frame 4 has a rod-like shape (prismatic shape).

The first frame 4 extends from the first fixing unit 2 in a direction (first direction) that intersects (orthogonally) with the longitudinal direction of the tubular member 10 .

A first inner support portion 21 is connected to one end of the first frame 4 in the first direction, and a first connecting member 41 (described later) is connected to the other end of the first frame 4 in the first direction. are connected to each other, and a first outer support part 22 is connected to the other side in the first direction than the first inner support part 21 and to the one side in the first direction than the first connection member 41 (described later). There is.

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

[Second frame]
The second frame 5 has a rod-like shape (prismatic shape).

The second frame 5 extends from the second fixing unit 3 in a direction (first direction) that intersects (orthogonally) with the longitudinal direction of the tubular member 10 . Specifically, the second frame 5 is parallel to the first frame 4 in the second direction with an interval between them.

A second inner support portion 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. are connected to each other, and a second outer support part 32 is connected to the other side in the first direction than the second inner support part 31 and to the one side in the first direction than the second connection member 42 (described later). There is.

The length of the second frame 5 (the length in the first direction) is the same as the length of the first frame 4 described above.

[Connection member]
The connecting member 6 extends in the second direction and connects the first frame 4 and the second frame 5.

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

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 the one side in the second direction. As shown in FIG. 3, the first connecting member 41 includes a groove 43 extending in the second direction. The groove 43 is an elongated hole that occupies most of the center of the first connecting member 41 .

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 end of the second frame 5 on the other side in the first direction toward the other side in the second direction. The length of the first connecting member 41 in the second direction is the same as the length of the second connecting member 42 in the second direction.

The second connecting member 42 includes a fixing portion 44 in the second direction.

The fixing portion 44 includes 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 thumb screw that is screwed onto the male screw 44a. Since the male screw 44a protrudes from the second connecting member 42 to one side in the first direction, once one of the tubular members 10 is cut, the jig 1 can be turned over to cut the other.

Further, 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 to one side in the first direction. That is, the fixing part 44 is fitted into the groove 43. Further, the female screw 44b is screwed onto the male screw 44a.

By loosening the female screw 44b in the fixing part 44, the first connecting member 41 and the second connecting member 42 can be slid (movement in the second direction), and by tightening the female screw 44b in the fixing part 44. , the sliding (movement in the second direction) of the first connecting member 41 and the second connecting member 42 is fixed. Thereby, the length of the connecting member 6 in the second direction can be adjusted in accordance with the length of the tubular member 10 in the longitudinal direction.

<How to use the jig>
An embodiment of a method of using a jig (specifically, a method of cutting a tubular member along its longitudinal direction using a jig) will be described with reference to FIGS. 4A to 4D.

The method of using the jig includes the first step of preparing the jig 1, adjusting the length of the connecting member 6 in the longitudinal direction, and attaching the jig to the inner peripheral surface 13 of the tubular member 10 at one end 11 of the tubular member 10. a second step of bringing the first inner support part 21 into contact with the inner circumferential surface 13 of the tubular member 10 at the other end 12 of the tubular member 10; A first outer support part 22 is brought into contact with the outer peripheral surface 14 of the tubular member 10 at one end 11, and a second outer support part 32 is brought into contact with the outer peripheral surface 14 of the tubular member 10 at the other end 12 of the tubular member 10. The method includes a third step of abutting the tubular member 10, and a fourth step of cutting the tubular member 10 along its longitudinal direction.

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

[Second step]
In the second step, as shown in FIG. 4B, the length in the longitudinal direction of the connecting member 6 is adjusted, and a first inner support portion 21 is attached to the inner circumferential surface 13 of the tubular member 10 at one end 11 of the tubular member 10. At the same time, the second inner support portion 31 is brought into contact with the inner circumferential surface 13 of the tubular member 10 at the other end 12 of the tubular member 10 .

In the second step, first, the length of the connecting member 6 in the longitudinal direction is adjusted. Specifically, first, by loosening the female screw 44b in the fixing part 44, the first connecting member 41 and the second connecting member 42 are slid, and the length of the connecting member 6 in the second direction is adjusted to the length of the tubular member 10. by adjusting the longitudinal length (second direction) of the first connecting member 41 and the second connecting member 42 to match the length in the longitudinal direction (second direction), and then tightening the female screw 44b in the fixing part 44. (movement) is fixed. In this way, the length in the longitudinal direction (second direction) of the tubular member 10 is adjusted by the connecting member 6, and the first frame 4 and the second frame 5 are adjusted in accordance with the length in the longitudinal direction of the tubular member 10. The length in the second direction between them is fixed.

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

[Third step]
In the third step, as shown in FIG. 4C, the first outer support part 22 is brought into contact with the outer peripheral surface 14 of the tubular member 10 at one end 11 of the tubular member 10, and at the other end 12 of the tubular member The second outer support portion 32 is brought into contact with the outer peripheral surface 14 of the member 10 .

Specifically, by threading the first screw 27 of the first fixing member 25 at one end 11 of the tubular member, the first fixing member 25 is moved from the other side in the first direction to the one side in the first direction. , bringing the first receiving portion 28 of the first fixing member 25 into contact with the outer peripheral surface 14 of the tubular member 10, and screwing the second screw 37 of the second fixing member 35 at the other end 12 of the tubular member. Therefore, the second fixing member 35 is moved from the other side in the first direction to the one side in the first direction, and the second receiving portion 38 of the second fixing member 35 is brought into contact with the outer peripheral surface 14 of the tubular member 10 . Thereby, the jig 1 clamps the tubular member 10 from the inside (inner peripheral surface 13) and outside (outer peripheral surface 14) of the tubular member 10.

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

Specifically, after the jig 1 is fixed with a vise or the like, for example, the tubular member 10 is cut along its longitudinal direction using a cutting device such as a band saw.

<Effect>
(1) According to the jig 1, at the one end 11 of the tubular member 10, the first inner support part 21 contacts the inner peripheral surface 13 of the tubular member 10, and the first outer support part 21 contacts the outer peripheral surface 14 of the tubular member 10. At the other end 12 of the tubular member 10, the second inner support portion 31 abuts against the inner peripheral surface 13 of the tubular member 10, and the second outer support portion 32 contacts the outer peripheral surface 14 of the tubular member 10. come into contact with Thereby, regardless of the shapes of the edges at both ends of the tubular member 10, the tubular member 10 can be fixed and the tubular member 10 can be cut along its longitudinal direction.

Specifically, conventionally, in decommissioning work for nuclear facilities (for example, nuclear power plants), piping used in nuclear reactors is inspected for contamination by radioactive materials before being disposed of.

Specifically, first, the pipe is cut to an arbitrary length, and then the pipe is cut vertically (more specifically, along the longitudinal direction of the pipe), and the inside thereof is inspected.

As a device for vertically cutting pipes, a pipe vertical cutting device disclosed in Patent Document 1 has been proposed. In the vertical pipe cutting device of Patent Document 1, as shown in FIG. 5A, a tubular member 10 is placed on a press base 51, and after holding both ends of the tubular member 10 between pipe holding members 52, The tubular member 10 is cut vertically with a cutter. However, in this vertical pipe cutting device, since both ends of the tubular member 10 are held between pipe holding members so as to be sandwiched 52, the edges of both ends of the tubular member 10 are perpendicular to the longitudinal direction of the tubular member 10. If the tubular member 10 does not have a flat surface (in FIG. 5A, both end edges of the tubular member 10 have flat surfaces inclined with respect to the longitudinal direction of the tubular member 10), the tubular member 10 cannot be fixed. Therefore, when cutting the tubular member 10 to a desired length, it is necessary to prepare the cut edge so that it has a flat surface perpendicular to the longitudinal direction of the tubular member 10, which makes the work complicated. There is a problem.

On the other hand, according to the jig 1 , at the one end 11 of the tubular member 10 , the first inner support portion 21 is in contact with the inner circumferential surface 13 of the tubular member 10 , and the first outer support portion is in contact with the outer circumferential surface 14 of the tubular member 10 . 22 are in contact with each other, and at the other end 12 of the tubular member 10, the second inner support portion 31 is in contact with the inner peripheral surface 13 of the tubular member 10, and the second outer support portion 32 is in contact with the outer peripheral surface 14 of the tubular member 10. come into contact with In other words, according to the jig 1, the tubular member 10 is supported in 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 contact. ing. Therefore, as shown in FIG. 5B, 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, the tubular member 10 is fixed and the tubular member 10 can be cut along its length. As a result, work efficiency is improved.

(2) According to the jig 1, the first inner support portion 21 includes the first inner protrusion 23, and the first outer support portion 22 extends in parallel with the first inner protrusion 23 at a distance. , 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 a portion of the first inner protrusion 23 facing the first outer protrusion 24. 29 can come into contact with the inner circumferential 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 comes into contact with the outer circumferential surface 14 of the tubular member 10. It is possible to make contact. Further, the second inner support part 31 includes a second inner protrusion part 33 extending toward the first fixing unit 2, and the second outer support part 32 is arranged in parallel with the second inner protrusion part 33 at an interval. The second outer protrusion 34 extends and has a second fixing hole 36, and the second fixing member 35 is inserted into the second fixing hole 36, and the second inner protrusion 33 faces the second outer protrusion 34. The portion 39 can come into contact with the inner circumferential 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 contacts the outer circumferential surface 14 of the tubular member 10 . It is possible to come into contact with.

Thereby, the tubular member 10 can be fixed more reliably and the tubular member 10 can be cut along its longitudinal direction, regardless of the shape of the edges at both ends of the tubular member 10.

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

Thereby, the tubular member 10 can be fixed according to the length of the tubular member 10 in the longitudinal direction.

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

Thereby, the tubular member 10 can be fixed according to the length of the tubular member 10 in the longitudinal direction.

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

Thereby, the tubular member 10 can be fixed according to the length of the tubular member 10 in the longitudinal direction.

<Modified example>
In the modified example, the same reference numerals are given to the same members and steps as in the embodiment, and detailed description thereof will be omitted. Further, the modified example can have the same effects as the first embodiment except as otherwise specified. Furthermore, one embodiment and its modified examples can be combined as appropriate.

In the above description, the second connecting member 42 includes the groove 43 and the first connecting member 41 includes the fixing part 44, but the first connecting member 41 includes the groove 43 and the second connecting member 42 includes the fixing part. 44 may also be provided.

That is, one of the first connecting member 41 and the second connecting member 42 is provided with the groove 43, and the other is provided with the fixing portion 44 that fits into the groove 43.

In the above description, the first fixing member 25 includes the first screw 27 and the first receiving part 28; however, the first fixing member 25 does not include the first receiving part 28 and is made of the first screw 27. You can also do that. In such a case, the tip of the first screw 27 comes into contact with the outer circumferential surface 14 of the tubular member 10 due to the screwing of the first screw 27 . Further, the same applies to the second fixing member 35.

1 Jig 2 First fixing unit 3 Second fixing unit 4 First frame 5 Second frame 6 Connecting member 10 Tubular member 11 One end 12 Other end 13 Inner peripheral surface 14 Outer peripheral surface 21 First inner support part 22 First outer support Part 23 First inner protrusion 24 First outer protrusion 25 First fixing member 26 First fixing hole 31 Second inner support 32 Second outer support 33 Second inner protrusion 34 Second outer protrusion 35 Second Fixing member 36 Second fixing hole 41 First connecting member 42 Second connecting member 43 Groove 44 Fixing part

Claims (4)

A jig for cutting a tubular member along the longitudinal direction of the tubular member,
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;
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 part that can come into contact with an inner peripheral surface of the tubular member at one end of the tubular member, and a first inner support part that can come into contact with an outer peripheral surface of the tubular member at one end of the tubular member. a first outer support portion;
The second fixing means includes, at the other end of the tubular member, a second inner support part that can come into contact with the inner circumferential surface of the tubular member, and at the other end of the tubular member, which makes contact with the outer circumferential surface of the tubular member. a second outer support portion that can be contacted ;
The first inner support portion includes a first inner protrusion extending toward the second fixing means;
The first outer support part extends parallel to and spaced from the first inner protrusion, and includes a first outer protrusion having a first fixing hole, and a first fixing member inserted into the first fixing hole. and
A portion of the first inner protrusion that faces the first outer protrusion can come into contact with an inner circumferential surface of the tubular member,
By inserting the first fixing member into the first fixing hole, the first fixing member can come into contact with the outer peripheral surface of the tubular member,
the second inner support portion includes a second inner protrusion extending toward the first fixing means;
The second outer support part extends in parallel with the second inner protrusion at a distance, and includes a second outer protrusion having a second fixing hole, and a second fixing member inserted into the second fixing hole. and
A portion of the second inner protrusion that faces the second outer protrusion can come into contact with the inner circumferential surface of the tubular member,
A jig , wherein the second fixing member is able to come into contact with an outer circumferential surface of the tubular member by inserting the second fixing member into the second fixing hole . The jig according to claim 1 , wherein the length of the connecting member in the longitudinal direction is adjustable. 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 2 , wherein the first connecting member and the second connecting member are configured to be slidable relative to each other. The jig according to claim 3 , wherein one of the first connecting member and the second connecting member includes a groove extending in the longitudinal direction, and the other includes a fixing portion that fits into the groove.