JP6242989B1 - Sheath opening tool - Google Patents

Abstract

There is provided a sheath opening tool that can open a sheath tube in a short time without fear of damaging the tendon inserted through the sheath tube. In a sheath opening tool 1 that is attached to the tip of a round bar B1 and cuts and opens a sheath tube, a cylindrical tool base 2 that can be attached to the tip of the round bar B1, and the tool base 2 A tip bar 3 which is attached to the tip and is urged by a spring so as to protrude and retract; and a cutting blade material 4 which is attached to the peripheral surface of the tool base 2 and has a curved tip. A sharp blade portion that tears the sheath tube is provided at the side end near the tip of the blade member 4, and the blade portion is recessed from the side end to the inside. [Selection] Figure 1

Description

  The present invention relates to a sheath opening tool for cutting and opening a sheath pipe of an existing PC structure for grout filling investigation and function recovery of the existing PC structure.

  In PC structures in which concrete is prestressed with PC steel and other tendon materials, there is a risk of corrosion and fracture of PC steel in areas where PC grout is insufficiently filled. There is concern about the decline. In order to recover the function of such a PC structure, it is considered effective to reinject the PC grout into the insufficiently filled portion.

  In order to find such an underfilled portion of PC grout, it was necessary to investigate grout filling of existing PC structures. In order to conduct this grout filling investigation, it is first necessary to drill a concrete portion of a PC structure and also to make a hole in a sheath tube through which a PC steel material is inserted.

  Further, drilling a hole in an existing PC structure is damaging the structure, and it is preferable that the hole to be drilled has a small diameter as much as possible. However, there is a problem that it is very difficult to make a hole in a sheath tube by using a small-diameter hole drilled in a concrete portion, and there is a high risk of damaging a tension material such as a PC steel material. In particular, this problem was conspicuous in PC structures constructed by overhanging construction in which steel bars are densely arranged because a large bending stress acts on the base end side like a cantilever beam.

  On the other hand, in Patent Document 1, in order to drill holes for inspection or repair in a concrete structure, the angle can be adjusted with respect to the work surface 10 of the concrete structure, and a diamond core bit is rotated to drill holes. A deep hole drilling machine 100 is disclosed (see paragraphs [0028] to [0049] of the specification of Patent Document 1, FIGS. 2 to 4 of the drawings, etc.).

  According to the deep hole drilling machine described in Patent Document 1, it is possible to form a deep hole in a PC structure without being shaken in the drilling operation even if the shaft is thin. It is said that a deep hole can be formed in a state in which concrete dust is not clogged by suction of muddy water.

  However, in the deep hole drilling machine described in Patent Document 1, although a concrete portion of a PC structure can be drilled, if a sheath tube is opened as it is, a tension material such as a PC steel material inserted into the sheath tube is used. There was a problem of possible damage. For this reason, there has been a demand for a sheath opening tool that can open a sheath tube without damaging the tendon inserted through the sheath tube.

JP 2009-160780 A

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to open the sheath tube in a short time without fear of damaging the tendon inserted into the sheath tube. An object of the present invention is to provide a sheath opening tool that can be used.

  A sheath opening tool according to a first aspect of the present invention is a sheath opening tool that is attached to the tip of a round bar and cuts and opens a sheath tube, and a cylindrical tool base that can be attached to the tip of the round bar; A tip bar which is attached to the tip of the tool base and is urged by a spring so as to be protruded and retracted, and is attached to a peripheral surface of the tool base, or a peripheral surface portion is integrated with the tool base. A cutting edge material that protrudes in the direction of the distal end and has a curved end, and the cutting edge material has a sharp edge that tears the sheath tube at the side end near the distal end. The side ends are formed to be recessed inward.

  The sheath opening tool according to a second aspect of the present invention is characterized in that, in the first aspect, the cutting blade material has a pair of blade portions at both ends in the circumferential direction.

  In the sheath opening tool according to a third aspect of the present invention, in the first or second aspect, the cutting blade material is configured to be detachable along the peripheral surface of the tool base, and the rear end is also curved. In addition, the side end in the circumferential direction in the vicinity of the rear end also has a blade portion for tearing the sheath tube, and the front end and the rear end can be interchanged.

  A sheath opening tool according to a fourth invention is characterized in that, in the invention of any one of the first invention to the third invention, the tip bar has a magnetic force and is configured to be capable of magnetizing iron. .

A sheath opening tool according to a fifth aspect of the present invention includes the manual handle that is manually rotated in any one of the first to fourth aspects of the invention, and the manual handle is orthogonal to the round bar and the round bar. And the tool base is directly or indirectly mounted on the round bar of the manual handle .

According to the first to fifth inventions, since the tip of the cutting blade material that comes into contact with the tension material inserted into the sheath tube of the PC structure is subjected to curved surface processing, there is no possibility of damaging the tension material. .
In addition, according to the first to fifth inventions, the tip bar is provided with a tip bar that is urged by a spring so as to be protruded and retracted, and the sheath tube is cut by a blade portion that is recessed inwardly. By pushing in, the blade portion of the cutting blade material can be relatively protruded to a position where it contacts the sheath tube. For this reason, even when the hole drilled in the concrete part of the PC structure is displaced from the axial center of the sheath tube, the convex bead of the sheath tube is accurately cut from the lateral direction and opened in a short time. Can be perforated.

  In particular, according to the second invention, since the cutting blade material has a pair of blade portions at both ends in the circumferential direction, the sheath tube can be cut by the blade portion regardless of the rotation direction. Convenience is increased and the sheath tube is easily opened.

  In particular, according to the third invention, since the front end and the rear end of the cutting blade material can be interchanged, even if the blade portion on the front end side becomes worn and cannot be used, the front end and the rear end can be interchanged, so that the sheath Opening tools can be used for a long time. For this reason, it is economical and the running cost can be reduced.

  In particular, according to the fourth invention, since the tip bar can magnetize iron, it is easy to magnetize and remove the end material of the sheath tube opened by the blade portion of the cutting blade material. For this reason, it is possible to reduce the work time by removing the trouble of pulling out the tool from the hole in the concrete portion and replacing it with a magnet or the like.

In particular, according to the fifth invention, the sheath opening tool can be manually rotated with the manual handle, and the operator can attach the sheath tube or the tension material to the sheath tube or the tension material as compared with the case where the sheath is attached to the tip of the rotary shaft such as an electric tool. It is easy to grasp whether or not it is in contact, and the risk of damaging the tendon is reduced.
Ah

It is a perspective view which shows the sheath opening tool which concerns on embodiment of this invention. It is a perspective view which shows the tool base | substrate of a sheath opening tool same as the above. It is a side view which shows a tool base | substrate same as the above. It is a figure which shows a tool base | substrate same as the above, (a) is the front view seen from the front end along the axial direction, (b) is the rear view seen from the opposite direction. It is a perspective view which shows the front-end | tip bar of the sheath opening tool of FIG. It is sectional drawing which shows the state cut | disconnected along the axial center of the tip rod same as the above. It is a perspective view which shows the spring stop cap of the sheath opening tool of FIG. It is a perspective view which shows the cutting blade material of the sheath opening tool of FIG. It is a top view which shows a cutting blade material same as the above. It is a figure which shows a cutting blade material same as the above, (a) is the front view seen from the front end direction, (b) is the left view. It is a perspective view which shows the intermediate | middle coupler of the sheath opening tool of FIG. It is a front view which shows the manual handle of the sheath opening tool of FIG. It is a top view which shows a manual handle same as the above. It is explanatory drawing which shows the use condition of the sheath opening tool which concerns on embodiment of this invention.

  Hereinafter, an embodiment for carrying out a sheath opening tool according to the present invention will be described in detail with reference to the drawings.

  First, the sheath opening tool according to the embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a sheath opening tool 1 according to an embodiment of the present invention. A sheath opening tool 1 according to an embodiment of the present invention includes a cylindrical tool base 2 that can be attached to the tip of a round bar B1, a tip bar 3 attached to the tip of the tool base 2, and a tool base 2. The tool is composed of a cutting blade material 4 mounted along the peripheral surface, and the like, and is a tool for cutting and opening a sheath tube.

  This sheath opening tool 1 is used to open a sheath tube, which is attached to the tip of a round bar B1 as shown in FIG. It is done. In this embodiment, the case where it is relayed by the intermediate coupler CP and attached to the round bar B1 is illustrated.

  When the sheath opening tool 1 is used, first, a hole reaching the sheath tube to the concrete portion of the PC structure is drilled using a drill bit or the like that is rotated by an electric motor. The sheath opening tool 1 is used when the tool is inserted into the hole and the sheath tube is cut and opened.

  In the sheath opening tool 1 according to the present embodiment, it is assumed that a hole is to be drilled by being inserted into a hole having a diameter of 16 mm as a hole to be drilled. Of course, it goes without saying that the sheath opening tool according to the present invention can also be applied to holes having a diameter exceeding 16 mm. The front end refers to the end in the direction in which the drilled hole is inserted, and the rear end refers to the end in the opposite direction (hereinafter the same).

(Tool substrate)
FIG. 2 is a perspective view showing the tool base 2 of the sheath opening tool 1, and FIG. 3 is a side view showing the tool base 2. 4A and 4B are diagrams showing the tool base 2, wherein FIG. 4A is a front view seen from the tip along the axial direction, and FIG. 4B is a rear view seen from the opposite direction.

  The tool base 2 is a member serving as a base for the entire tool formed from stainless steel in consideration of wear resistance and rust prevention. As shown in FIGS. 2 to 4, the tool base 2 includes a substantially cylindrical base body 20, a countersink part 21 in which a part of the tip of the base body 20 is cut off, and a tip of the countersink part 21. A spring mounting hole 22 drilled along the axial direction from the surface, a cutting blade material mounting groove 23 formed in the peripheral surface of the base body 20, a hexagonal bar portion 24 for rolling with the intermediate coupler CP, etc. It is composed of

  As shown in FIG. 4 and the like, the counterbore portion 21 is cut out in an arc shape centering on the lower half of the base body 20 and the center of the spring mounting hole 22. It is a space for allowing it to project freely in the direction of the arrow (axial direction).

  The spring mounting hole 22 is a hole for inserting a coil spring (not shown) for the purpose of energizing a certain force when the tip rod 3 is retracted, and the spring cap 5 is screwed to the tip portion. An internal thread portion 22a is formed.

  The cutting blade material mounting groove 23 is a groove in which a part of the peripheral surface is cut into a bowl shape along the axial direction in the columnar base body 20, and the vertical cross section has a bottom width as shown in FIG. 4 and the like. It has a dovetail shape with a narrower width at the upper end (end in the radial direction from the center). For this reason, the cutting blade material 4 can be slid and attached and pulled and fixed with a set screw SS (hexagon socket set screw) described later (see also FIG. 1).

  As shown in FIG. 4B and the like, the hexagonal bar portion 24 is a portion for connecting to an intermediate coupler CP, which will be described later, and is formed in a hexagonal column shape so that the corner of the rear end is not sharpened. Has been. Of course, the hexagonal bar portion 24 is exemplified as a hexagonal column-shaped portion as an embodiment, but can be inserted into the cylindrical intermediate coupler CP, and other polygonal shapes having a plane portion for fastening with a set screw SS or the like. Shape may be sufficient.

(Tip bar)
FIG. 5 is a perspective view showing the distal end bar 3 of the sheath opening tool 1, and FIG. 6 is a cross-sectional view showing a state cut along the axis. As shown in FIGS. 5 and 6, the tip rod 3 may come into contact with the tension material, and therefore the tip rod main body 30 made of a so-called round head pin made of stainless steel having a round head 30 a formed at the tip of the round rod. And a columnar magnet 31 made of a ferrite magnet fitted into the tip rod body 30.

  Of course, the magnet 31 is not limited to a ferrite magnet, but may be a permanent magnet having a strong magnetic force. However, a permanent magnet having a strong magnetic force has a characteristic that it is weak against an impact and is brittle because many ceramic magnets are sintered bodies. For this reason, in the tip bar 3 according to the present embodiment, a stainless steel round head pin that is resistant to wear and impact is provided with a through hole along the central axis, and a magnet 31 is fitted inside the through hole. This improves the durability of ferrite magnets.

  In addition, the hole formed in the round head pin may be a hole in which the tip that does not penetrate the round head 30a portion is closed, and the magnet 31 is inserted into the hole so that the magnet 31 is not exposed. However, in order to increase the magnetic force for magnetically attaching the end material of the sheath tube, a form in which the magnet 31 is exposed is preferable.

  When the distal end of the distal end bar 3 is inserted into the spring mounting hole 22 and the rear end of the distal end bar 3 is urged toward the distal end by a compressed coil spring, the distal end bar 3 is retracted and sunk. It is comprised so that the force more than predetermined may be required.

(Spring cap)
FIG. 7 is a perspective view showing the spring retaining cap 5 of the sheath opening tool 1. As shown in FIG. 7, the spring stopper cap 5 has a square head bolt 50 whose corners are rounded as a base, and a tip rod insertion hole for inserting the tip rod 3 into the square head bolt 50. 51 is formed.

  The spring stopper cap 5 is screwed into the female threaded portion 22a of the spring mounting hole 22, and the tip bar 3 biased by the spring is compressed in a state where the coil spring inserted into the spring mounting hole 22 is compressed. Has a function of hooking the rear end. The function of the spring stopper cap 5 prevents the tip bar 3 from popping out due to the repulsive force of the coil spring.

(Cut blade material)
FIG. 8 is a perspective view showing the cutting blade material 4 of the sheath opening tool 1, and FIG. 9 is a plan view showing the cutting blade material 4. 10A and 10B are diagrams showing the cutting blade material 4, in which FIG. 10A is a front view seen from the front end direction, and FIG. 10B is a left side view thereof.

  The cutting blade material 4 is a strip having a long and narrow cross section made of a general tool steel such as high speed steel along a bowl-shaped axial direction. As shown in FIGS. 8 to 10, this cutting blade material 4 has a cutting blade material body 40 having a bowl-shaped cross section that can be mounted in the above-described cutting blade material mounting groove 23, and is polished at both ends thereof. It is composed of a pair of front and rear tip portions 41 having the same shape and a rear end portion 42 formed.

  As shown in FIG. 10A, the cutting blade main body 40 has a ant tenon shape in which the lower corner interval is wider than the upper corner interval. As shown in FIG. 9 and the like, a through-hole 40a in which a female thread is cut is formed in the center of the plane of the cutting blade body 40, and a set screw SS (hexagonal socket set screw) that is rotated by a hexagon wrench there. ) Is installed. For this reason, the cutting blade material body 40 is detachable by sliding it into the cutting blade material mounting groove 23 from the tip side, and the set screw SS is rotated toward the bottom surface of the cutting blade material mounting groove 23 by turning the set screw SS. By projecting and stretching, the dovetail-shaped cutting blade material body 40 can be fixed to the dovetail hole of the cutting blade material mounting groove 23 and fixed at an arbitrary position.

  The front end portion 41 and the rear end portion 42 have a line-symmetric shape, and the end surface 41a and the end surface 42a are subjected to gentle curved surface processing with a curvature radius of about 50 mm. For this reason, even if it is a case where the sheath tube is cut and the cutting blade material 4 comes into contact with the tendon, the tendon is not damaged. For this reason, there is no fear that the tendon will be damaged for the investigation, and the deterioration investigation of the PC structure becomes highly reliable.

  Moreover, the front-end | tip part 41 and the rear-end part 42 have a pair of blade parts 41b and 42b in the both ends of the circumferential direction. These blade portions 41b and 42b are formed in a shape in which the side edges are pointed like a lens in a cross section by polishing until the side end lines are recessed in a circular arc shape on the inside and are cut and cut. .

  As described above, the cutting blade material 4 is slidable and detachable by sliding it into the cutting blade material mounting groove 23, and the pair of front and rear tip portions 41 and rear end portions 42 have the same shape. For this reason, it can be used as a cutting blade by replacing the front end and the rear end. Therefore, even if the front end side blade portion 41b is worn and cannot be used, the sheath opening tool 1 can be used for a long time by replacing the front end and the rear end. For this reason, it is economical and the running cost can be reduced.

  In addition, although the case where the tool base was separated from the tool base was described as an example, the tool base and the cutting blade were formed integrally, and a part of the peripheral surface portion of the tool base protruded in the tip direction. It is also possible to use a cutting edge material for the portion.

  Next, an optional member that is not essential for the sheath opening tool 1 according to the present embodiment will be described. FIG. 11 is a perspective view showing the intermediate coupler CP of the sheath opening tool 1.

(Intermediate coupler)
The intermediate coupler CP is a member mainly made of a stainless steel tube material, and is a member for rolling the round bar B1, which is a shaft of an electric power tool or a manual handle H described later, and the above-described sheath opening tool 1. The intermediate coupler CP makes it easy to mount on a round bar made of shafts of different lengths. As shown in FIG. 11, the intermediate coupler CP is mainly composed of a coupler main body CP1 which is a stainless steel pipe material.

  The coupler main body CP1 is formed with an insertion port CP2 into which the aforementioned hexagonal bar portion 24 is inserted. The intermediate coupler CP is clamped and fixed with set screws SS (hexagonal socket set screws) installed on the left and right side surfaces of the tip end with the hexagonal bar portion 24 inserted into the insertion port CP2, and a tool base. 2 are connected and fixed in the same manner with set screws SS installed on both the left and right side surfaces on the front end side, and the round bar B1 is connected. Reference sign CP3 is a spanner hanging portion for hanging and turning the spanner. This spanner hanging part CP3 is formed in a pair of upper and lower sides (the lower spanner hanging part is not shown).

(Manual handle)
Next, the manual handle H that is an optional member of the sheath opening tool 1 will be described. FIG. 12 is a front view showing the manual handle H of the sheath opening tool 1, and FIG. 13 is a plan view showing the manual handle H.

  As shown in FIGS. 12 and 13, the manual handle H includes a central block H1 made of a cylindrical steel material, and two handle bolts that are fastened with screws to the left and right side surfaces of the central block H1 and screwed together. H2 and a shaft H3 which is a round bar B1 penetrating the central block H1 up and down, a cap nut H4 which fixes the upper end of the shaft H3 to the central block H1, and the like, and manually rotates the sheath opening tool 1 It is a part for. Reference numeral H5 denotes a spanner hanging portion for hanging and turning the spanner. As shown in FIG. 12, the spanner hanging portion H5 is formed in a pair of left and right.

  By attaching this manual handle H to the tool base 2 via the intermediate coupler CP, the sheath opening tool 1 can be manually rotated. By manually rotating the sheath opening tool 1, it is easier to grasp whether or not the operator is in contact with the sheath tube or the tension material compared to the case where the operator is attached to the tip of the rotary shaft such as an electric tool. There is less risk of damaging the tendon.

  Next, an embodiment of a method for using the sheath opening tool 1 and its operation will be described with reference to FIGS. FIG. 14 is an explanatory view showing a use state of the sheath opening tool 1. As a method of using the sheath opening tool 1, first, a hole having a small diameter of about 16 mm until reaching the sheath tube in which the tension material is inserted in the concrete portion of the PC structure in advance is drilled.

  Next, the concrete powder and the like are removed, and the sheath opening tool 1 equipped with the manual handle H is inserted into the concrete hole. Then, as shown in FIG. 13, the sheath tube SP is opened by rotating to one of right rotation and left rotation.

  At this time, even if the position of the sheath pipe SP of the existing PC structure is confirmed using a detector or the like, as shown in FIG. 14, the shaft core of the sheath pipe SP and the drilled concrete hole are slightly shifted. In many cases, the distal end portion of the sheath opening tool 1 also deviates from the axial center.

  However, since the distal end bar 3 of the sheath opening tool 1 is urged by a spring so as to be freely projecting and retracting, when the operator pushes in with force while grasping the feel of the sheath tube SP, the distal end bar 3 is moved. Withdrawn and died. Then, the cutting blade material 4 protrudes relatively, and the arcuate blade portion 41b of the cutting blade material 4 is caught by a reinforcing spiral convex bead or the like (not shown) of the sheath tube SP, and the sheath tube SP. Can be cut from the inside (side) to the outside.

  At this time, the round head 30a and the end surface 41a of the distal end rod 3 which is the distal end in the advancing direction into which the sheath opening tool 1 is inserted are formed in a curved surface, and the sharp blade portion 41b does not protrude. When inserting the hole tool 1 or pushing it in, the tension material is less likely to be damaged even if the tip rod 3 or the cutting blade material 4 comes into contact with the tension material.

  Further, as shown in FIG. 13, since the arcuate blade portion 41b exists in both directions even if it rotates in both directions, there is a high probability of being caught by the sheath tube SP and tearing, and the axis of the sheath tube SP and the drilling hole Even if the hole of the concrete which has been displaced is misaligned, it can be accurately opened.

  And the end material at the time of tearing and opening the sheath pipe SP which is a steel pipe can be collect | recovered and removed when it sticks and pulls out the sheath opening tool 1 with the magnetic force of the magnet 31 of the tip rod 3. FIG. . For this reason, there is no possibility that the end material at the time of opening will damage the tendon. In addition, the operation time can be shortened by eliminating the trouble of pulling out the tool from the hole in the concrete portion and replacing it with a magnet or the like.

  Thereafter, a microscope or the like can be inserted from the opened hole, and the unfilled portion of the sheath tube SP can be confirmed and the state of deterioration of the tendon can be confirmed.

  According to the sheath opening tool 1 according to the embodiment of the present invention described above, the sheath tube can be opened without fear of damaging the tendon. In addition, according to the sheath opening tool 1, the distal end bar 3 is configured to be protruded and retracted by being urged by a spring, and the sheath tube SP is torn by the blade portion 41b formed inwardly. By pushing 3 in, the blade part 41b of the cutting blade material 4 can be relatively projected to a position where it contacts the sheath tube SP. For this reason, even when the hole drilled in the concrete part of the PC structure is displaced from the axial center of the sheath tube, the convex bead of the sheath tube is accurately cut from the lateral direction and opened in a short time. Can be perforated.

  Further, according to the sheath opening tool 1, since the pair of blade portions 41b are provided at both ends in the circumferential direction of the cutting blade material 4, the sheath tube SP can be cut by rotating in both directions. The sheath tube can be easily opened in a short time.

  In addition, according to the sheath opening tool 1, since the front end portion 41 and the rear end portion 42 of the cutting blade material 4 can be interchanged, even if the front end side blade portion 41b is worn and cannot be used, By changing the front end and the rear end, the sheath opening tool 1 can be used for a long time. For this reason, it is economical and the running cost can be reduced.

  In addition, according to the sheath opening tool 1, since the tip bar 3 can magnetize iron, the end material of the sheath tube SP opened by the blade part 41b of the cutting blade material 4 is magnetized by the tip bar 3. Easy to remove. For this reason, it is possible to reduce the work time by removing the trouble of pulling out the tool from the hole in the concrete portion and replacing it with a magnet or the like.

  Furthermore, according to the sheath opening tool 1, the sheath opening tool 1 can be manually rotated by the manual handle H, and the operator can control the sheath tube as compared with the case where the sheath opening tool 1 is attached to the tip of a rotary shaft such as an electric tool. It is easy to grasp whether or not it is in contact with the tendon, and the risk of damaging the tendon is reduced.

  As described above, the sheath opening tool according to the embodiment of the present invention has been described in detail. However, each of the above-described or illustrated embodiments is merely an embodiment embodied in carrying out the present invention. Therefore, the technical scope of the present invention should not be limitedly interpreted. In particular, it goes without saying that materials such as stainless steel for each member of the sheath opening tool can be appropriately selected and applied. In addition, it is obvious that the present invention can be applied without an intermediate coupler or a manual handle.

1: Sheath opening tool 2: Tool base 20: Base body 21: Countersink part 22: Spring mounting hole 22a: Female thread part 23: Cutting blade material mounting groove 24: Hexagonal bar part 3: Tip bar 30: Tip bar body 30a : Round head 31: Magnet 4: Cutting blade material 40: Cutting blade body 40a: Through hole 41: Front end portion 42: Rear end portions 41a and 42a: End surfaces 41b and 42b: Blade portion 5: Spring cap 50: Square head bolt 51: Tip rod insertion hole B1: Round bar CP: Intermediate coupler CP1: Coupler body CP2: Insertion port CP3: Spanner hook H: Manual handle H1: Center block H2: Handle bolt H3: Shaft H4: Cap nut H5: Spanner hook Part SS: Set screw SP: Sheath tube

Claims (5)

A sheath opening tool that is attached to the tip of a round bar to open and open a sheath tube,
A cylindrical tool base that can be attached to the tip of the round bar;
A tip bar that is attached to the tip of the tool base and is urged by a spring so as to freely protrude and retract;
A cutting edge material that is attached to the peripheral surface of the tool base or is formed so that a peripheral surface portion protrudes in the tip direction integrally with the tool base, and the tip is curved.
The cutting blade material has a sharp blade portion that cuts a sheath tube at a side end near the tip, and the blade portion is formed such that the side end is recessed inward. The sheath cutting tool according to claim 1, wherein the cutting blade material has a pair of blade portions at both ends in a circumferential direction. The cutting blade material is configured to be detachable along the peripheral surface of the tool base. The rear end is also curved and has a blade portion that tears the sheath tube at the side end in the circumferential direction near the rear end. The sheath opening tool according to claim 1, wherein the tip end and the rear end are configured to be interchangeable. The sheath opening tool according to any one of claims 1 to 3, wherein the distal end bar has a magnetic force and is configured to be capable of magnetizing iron. With a manual handle that rotates manually,
This manual handle has the round bar and a pair of handle parts orthogonal to the round bar,
The sheath opening tool according to any one of claims 1 to 4, wherein the tool base is directly or indirectly attached to the round bar of the manual handle .

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