JP6978378B2 - Built-in jig - Google Patents

Description

The present invention relates to a jig for building a steel material.

Construction of the structure Shinbashira is carried out, for example, by building a steel material such as H-shaped steel in the excavated part where the ground is excavated, and burying and fixing the lower end portion in the concrete of the structure pillar pile. If the top end of the structural pillar (steel material) is located below the ground surface, connect a building jig (also called Yatko) to the upper end of the steel material, and use the building jig on the ground to bring the steel material to an appropriate depth. While holding it in a position and posture, wait for the concrete buried in the lower end of the steel material to solidify.

Patent Documents 1 and 2 describe such a built-in jig in which a pin can be inserted and removed from the holes of two steel plates provided at the lower end portion. The H-shaped steel is connected to the building jig by inserting the upper end of the web of the H-shaped steel between these steel plates and inserting a pin into the hole of the steel plate and the hole of the upper end of the web of the H-shaped steel. be able to.

Jikkenhei 4-97939 Gazette Jikkenhei 3-103330 Gazette

When the number of installed Shinbashira is large, it is costly to connect the built-in jig to all the steel materials, and the built-in jig that can be connected to and disconnected from the steel material for diversion can be surely performed. Is required.

In Patent Documents 1 and 2, when the connection between the built-in jig and the H-shaped steel is released, the pin is pulled out from the hole by pulling the wire or the like connected to the pin from the ground. There was concern about the certainty of the method of disconnecting. For example, if a wire or the like is caught in an obstacle, the pin may not be pulled out properly.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a built-in jig or the like capable of reliably connecting and disconnecting a steel material.

The present invention for achieving the above-mentioned object is a building jig used for building the steel material by connecting to the steel material, and includes a columnar main body and a rod arranged along the axial direction of the main body. A pair of connecting plates provided at the lower end of the main body for inserting the steel material between them, and a pair of connecting plates and the steel material inserted between the pair of connecting plates by rotation around the axis of the rod. A connecting pin that is taken in and out of the provided pin hole, a stopper for preventing rotation of the rod around the axis, and a plurality of handles that project laterally from the rod are provided above and below the rod. It is a built-in jig characterized by this.

In the present invention, the connecting pin for connecting the built-in jig and the steel material is taken in and out of the connecting plate and the pin hole of the steel material by the rotation around the axis of the rod. It is possible to reliably connect and disconnect the steel material.

Further, by providing the handle on the rod, the rod can be easily operated. By providing the handles on the upper and lower sides, it is possible to connect and disconnect the building jig on the ground by operating the rod with any appropriate handle when the steel material is built. In addition, the stopper prevents the connecting pin from coming off the connecting plate and the pin hole of the steel material due to unintended rotation of the rod, breaking the connection between the building jig and the steel material, and preventing the steel material from falling out of the building jig. can.

It is desirable that the stopper fixes the position of the handle. For example, the stopper is a rod-shaped member capable of moving up and down and rotating around an axis, and a protrusion is provided on the side surface, and the protrusion is provided on the side surface of a cylindrical holding portion through which the stopper is passed. It is passed through a hook-shaped groove.
When the rod is operated by the handle as described above, the unintended rotation of the rod can be prevented by fixing the handle with the stopper. In addition, by passing the protrusion of the stopper through the hook-shaped groove described above, it becomes possible to fix the stopper at multiple heights by the vertical movement of the stopper and the rotation around the axis, and the stopper prevents the rotation of the rod. It is possible to switch between the closed state and the released state by the height of the stopper.

It is desirable that the rod is provided with an arm and the arm is rotatably connected to a pin holding portion that holds the connecting pin.
As a result, the rotation of the rod can be suitably converted into the movement of inserting and removing the connecting pin by the crank type mechanism, and the connection between the built-in jig and the steel material and the disconnection thereof can be performed more reliably.

It is desirable that the plate is mounted along the axial direction of the main body and that the plate is provided with a plurality of holes at intervals in the axial direction of the main body.
By selecting an appropriate hole from the above holes and using it to attach a fixing jig for fixing the built-in jig, the built-in jig can be fixed at an appropriate height according to the building depth of the steel material. can do.

It is desirable that a pair of sandwiching plates for sandwiching the steel material are provided at the lower end of the main body, and one or a plurality of plate-shaped spacers are arranged between the main body and the sandwiching plate.
As a result, the distance between the sandwiching plates can be adjusted according to the cross-sectional dimension of the steel material, the steel material can be appropriately sandwiched by the sandwiching plates, and the misalignment of the steel material can be prevented.

According to the present invention, it is possible to provide a built-in jig or the like that can reliably connect to and disconnect from a steel material.

The figure which shows the built-in jig 1. The figure which shows the connection procedure of a building jig 1 and H-shaped steel 45. The figure which shows the connection procedure of a building jig 1 and H-shaped steel 45. Elevation view of the built-in jig 1 and the H-shaped steel 45. The figure which shows the horizontal cross section along the line AA of FIG. The figure which shows the connection procedure of a building jig 1 and H-shaped steel 45. Elevation view of the built-in jig 1 and the H-shaped steel 45. The figure which shows the H-shaped steel 45 used as a structural pillar. The figure which shows the building method of the H-shaped steel 45. The figure which shows the range B of FIG. 9 (b). The figure which shows the spacer 63.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1. Built-in jig 1)
FIG. 1 is a diagram showing a built-in jig 1 (Yatco) according to an embodiment of the present invention. This building jig 1 is used by being connected to the upper end portion of the H-shaped steel when the H-shaped steel is built into the excavated portion of the ground to form a structural pillar. Note that FIG. 1 shows the built-in jig 1 before connecting the H-shaped steels.

The built-in jig 1 is provided with a rod 7, an arm 13, a pin holding portion 15, a connecting plate 19, a connecting pin 21, a stopper 25, a height adjusting plate 37, a sandwiching plate 41, and the like on the main body 2. Is.

The main body 2 of the building jig 1 is a columnar member, and an H-shaped steel composed of a pair of flanges 3 (3a, 3b) and a web 5 is used.

A rod 7 is arranged in the vicinity of the inner side surface of one flange 3a of the main body 2 along the axial direction of the main body 2. The upper end of the rod 7 is located near the upper end of the main body 2, and the lower end is located below the lower end of the main body 2. In addition, "upper" corresponds to the upper side of FIG. 1, and "lower" corresponds to the lower side of FIG.

The rod 7 is held by passing through the inside of a cylindrical rod holding portion 9 fixed to the inner surface of the flange 3a, and is rotatable around an axis. In the present embodiment, a plurality of rod holding portions 9 are provided vertically (three in the example of FIG. 1), but the number of rod holding portions 9 is not limited to this. For example, the rod holding portion 9 may be provided only at one place near the center of the rod 7.

A handle 11 is provided on the rod 7. The handle 11 is a rod-shaped member protruding laterally from the rod 7, and in the present embodiment, a plurality of handles 11 (two handles 11a and 11b in the example of FIG. 1) are provided up and down. The rod 7 can be operated by any of the handles 11 to rotate around an axis.

One end of the arm 13 is fixed to the lower end of the rod 7. The other end of the arm 13 is connected to the pin holding portion 15.

The pin holding portion 15 holds the connecting pin 21 and has a pair of horizontal plates 15a arranged to face each other and a vertical plate 15b fixed to the end of both horizontal plates 15a on the web 5 side. The connecting pin 21 is fixed to the surface of the vertical plate 15b on the web 5 side.

The other end of the arm 13 described above is inserted between the pair of horizontal plates 15a of the pin holding portion 15, and is rotatably connected to the horizontal plates 15a by the shaft 17.

At the lower end of the web 5 of the main body 2, connecting plates 19 are fixed to both sides of the web 5 one by one. These pair of connecting plates 19 are provided for inserting a web of H-shaped steel between them. A chamfer 20 is applied to the corners of the lower ends of the facing surfaces of these connecting plates 19. Each connecting plate 19 is provided with a pin hole 23 for passing the connecting pin 21.

A stopper 25 is arranged along the axial direction of the main body 2 in the vicinity of the inner side surface of the other flange 3b of the main body 2. The stopper 25 is provided to prevent unintended rotation of the rod 7. The stopper 25 is a rod-shaped member that can move up and down, and the upper end is located near the upper end of the main body 2 and the lower end is located near the lower end of the main body 2.

The stopper 25 is rotatably held around the axis through the inside of the cylindrical stopper holding portion 27 fixed to the inner surface of the flange 3b. A plurality of stopper holding portions 27 (two in the example of FIG. 1) are provided on the upper and lower sides, and hook-shaped grooves 29 are formed on the respective side surfaces.

The groove 29 has a straight portion 29a along the axial direction of the stopper 25 and a bent portion 29b in which the upper end of the straight portion 29a is bent like a hook.

A rod-shaped protrusion 31 is provided on the side surface of the stopper 25. In the present embodiment, a plurality of protrusions 31 (two protrusions 31a and 31b in the example of FIG. 1) are provided vertically, and these protrusions 31 are passed through the corresponding grooves 29 of the upper and lower stopper holding portions 27, respectively. To.

A lock portion 33 is fixed to the inner surface of the flange 3b above the stopper holding portion 27 at the upper portion. The lock portion 33 is composed of a pair of horizontal plates 331 arranged so as to face each other, and each horizontal plate 331 has a lock hole 35 for passing the upper end 25a of the stopper 25.

In FIG. 1, the protrusion 31 of the stopper 25 is arranged at the lowermost end of the straight portion 29a of the groove 29, and the stopper 25 is at the lowest position. At this time, the upper end 25a of the stopper 25 is not passed through the lock hole 35 (it has come out of the lock hole 35).

In this embodiment, two upper and lower handles 11 and a protrusion 31 are provided, but the present invention is not limited to this, and three or more handles 11 and the protrusion 31 may be provided. Further, although the two stopper holding portions 27 are provided in the present embodiment, three or more stopper holding portions 27 may be provided, or one long stopper holding portion 27 may be provided. In the latter case, the groove 29 can be formed in one stopper holding portion 27 by the amount corresponding to the protrusion 31. Further, the stopper holding portion 27 and the protrusion 31 may be provided one by one.

A height adjusting plate 37 along the axial direction of the main body 2 is fixed to the outer surfaces of both flanges 3a and 3b of the main body 2 by welding or the like. The height adjusting plate 37 is provided with a plurality of adjusting holes 39 at intervals in the axial direction of the main body 2.

One sandwiching plate 41 is provided on the outer surface of the lower ends of both flanges 3a and 3b. These pair of sandwiching plates 41 are for sandwiching a flange of H-shaped steel between them. These sandwiching plates 41 are fixed to the flanges 3a and 3b using fasteners 43 such as bolts, and chamfering 42 is applied to the corners of the lower ends of the facing surfaces.

(2. Connection of built-in jig 1 and H-shaped steel 45)
FIGS. 2, 3 and 6 are views showing a procedure for connecting the built-in jig 1 and the H-shaped steel 45. 4 and 7 are elevation views of the built-in jig 1 and the H-shaped steel 45 of FIGS. 3 and 6, respectively, and FIG. 5 shows a horizontal cross section along the line AA of FIG. .. Here, it is assumed that the cross-sectional dimension of the cross section (hereinafter, simply referred to as a cross section) in the direction orthogonal to the axial direction of the main body 2 is substantially the same as that of the H-shaped steel 45.

In order to connect the built-in jig 1 and the H-shaped steel 45, first, as shown in FIG. 2, the H-shaped steel 45 is connected between the two connecting plates 19 (see FIG. 1) of the built-in jig 1. The upper end of the web 49 is inserted, and the H-shaped steel 45 is arranged so as to sandwich the upper ends of both flanges 47 of the H-shaped steel 45 with the two sandwiching plates 41 (see FIG. 1) of the building jig 1. Since the connecting plate 19 and the sandwiching plate 41 are chamfered 20 and 42, the H-shaped steel 45 can be smoothly arranged.

A pin hole 59 (see FIG. 5) is provided at the upper end of the web 49 of the H-shaped steel 45, and in the state shown in FIG. 2, the pin hole 59 of the H-shaped steel 45 and the pin hole 23 of the connecting plate 19 are provided. Is in the corresponding position.

Next, the rod 7 is operated by the handle 11 to rotate around the axis as shown by the arrow a in FIG. Then, the arm 13 fixed to the rod 7 rotates together with the rod 7, and the pin holding portion 15 at the tip of the arm 13 moves toward the web 49 of the H-shaped steel 45.

As a result, the connecting pin 21 is inserted into the connecting plate 19 and the pin holes 23 and 59 of the H-shaped steel 45 as shown in FIG. 5, and the H-shaped steel 45 is installed in the building jig 1 as shown in FIGS. 3 and 4. Is linked to. The sandwiching plate 41 sandwiches both flanges 47 of the H-shaped steel 45 to prevent the H-shaped steel 45 from being displaced. At this time, the tip of the upper handle 11a is arranged between the pair of horizontal plates 331 of the lock portion 33.

Next, as shown in FIGS. 6 and 7, the stopper 25 is moved upward and the upper end 25a thereof is passed through the lock hole 35 of each horizontal plate 331, so that the upper end 25a causes the tip of the handle 11a to move to the main body 2 side. It can be suppressed, the position of the handle 11a can be fixed to prevent the rod 7 from rotating, and the connecting pin 21 can be prevented from coming out of the pin holes 23 and 59 of the connecting plate 19 and the H-shaped steel 45.

When moving the stopper 25 upward, the stopper 25 is moved upward so that the protrusion 31 of the stopper 25 moves from the lowermost end of the straight portion 29a of the groove 29 to the bent portion 29b as shown by the arrow b in FIG. Move to and rotate around the axis.

As a result, the height of the stopper 25 is fixed in a state where the upper end 25a of the stopper 25 is inserted into the lock holes 35 of the pair of horizontal plates 331 of the lock portion 33.

When disconnecting the built-in jig 1 and the H-shaped steel 45, the stopper 25 is operated in the reverse order of the above to release the fixing of the handle 11a by the upper end 25a of the stopper 25, and then by the handle 11. The rod 7 is operated to rotate the rod 7 in the direction opposite to the above direction (direction indicated by the arrow a in FIG. 2). As a result, the connecting pin 21 comes out of the connecting plate 19 and the pin holes 23 and 59 of the H-shaped steel 45, and the connection between the built-in jig 1 and the H-shaped steel 45 is released.

As shown in FIG. 5, the pin hole 23 of the connecting plate 19 on the pin holding portion 15 side has a larger diameter than the pin hole 23 of the other connecting plate 19. Therefore, the connecting pin 21 can be smoothly put in and taken out.

(3. Building method of H-shaped steel 45)
FIG. 8 is a diagram showing an example of an H-shaped steel 45 used as a structural pillar. The H-shaped steel 45 is built in the excavated portion 53 of the ground 51, and its top end is located below the ground surface. The lower end of the H-shaped steel 45 is embedded in the upper end of the concrete of the structure pillar pile 57. The excavated portion 53 above the structure Shinbashira pile 57 is backfilled with backfill soil 58.

Hereinafter, the method of building the H-shaped steel 45 will be described with reference to FIG. 9 and the like.

In the present embodiment, as shown in FIG. 9A, first, the ground 51 is excavated in the vertical direction to form an excavated portion 53, and concrete of the structural pillar pile 57 is placed. Then, the H-shaped steel 45 is suspended and arranged in the vertical direction in the excavation portion 53, and the built-in jig 1 and the H-shaped steel 45 are connected in a state where the upper end portion thereof is temporarily supported by the gantry 54 on the ground. ..

The connecting method is as described above, but the operation of the rod 7 and the stopper 25 at this time may be performed on the ground by holding the handle 11b at the lower part of the rod 7 near the ground surface and the protrusion 31b at the lower part of the stopper 25. ..

After that, before the concrete of the structure pillar pile 57 is solidified, the H-shaped steel 45 is built up to a predetermined depth of the excavated portion 53 as shown in FIG. 9B, and the lower end portion of the H-shaped steel 45 is set as the structure pillar. It is buried in the upper end of the concrete of the pile 57. The top end of the H-shaped steel 45 is below the ground surface, but a part of the built-in jig 1 is on the ground, and the fixing jig 55 attached to the height adjusting plate 37 is provided on the ground surface. Installed on top.

FIG. 10 is a diagram showing a range B in FIG. 9 (b). As shown in FIG. 10, for the fixing jig 55 and the height adjusting plate 37, an appropriate adjustment hole 39 of the height adjusting plate 37 is selected, and the adjusting hole 39 and the fixing jig 55 are used. It is fixed by aligning the positions of the provided holes (not shown), passing a bolt 61 through these holes, and tightening a nut at the tip thereof.

As a result, the building jig 1 can be fixed at an appropriate height according to the building depth of the H-shaped steel 45, and the H-shaped steel 45 is held in this state. After the concrete of the structure Shinbashira pile 57 is solidified, the connection between the building jig 1 and the H-shaped steel 45 is released, and the building jig 1 is removed from the H-shaped steel 45 as shown in FIG. 9 (c).

The method of releasing the connection between the built-in jig 1 and the H-shaped steel 45 is as described above, but the operation of the stopper 25 and the rod 7 at this time is as follows: the protrusion 31a on the upper part of the stopper 25 and the handle on the upper part of the rod 7. It can be done on the ground with 11a (see FIG. 10).

After removing the building jig 1 in this way, the excavated portion 53 above the structure pillar pile 57 is backfilled with backfill soil 58 as shown in FIG. Alternatively, it may be backfilled with fluidized soil or the like. The removed building jig 1 can be diverted to the building of another H-shaped steel 45.

As described above, in the present embodiment, the connecting pin 21 for connecting the building jig 1 and the H-shaped steel 45 is a pin hole of the connecting plate 19 and the H-shaped steel 45 by the rotation around the axis of the rod 7. Since it is taken in and out of 23 and 59, it is possible to reliably connect and disconnect the building jig 1 and the H-shaped steel 45 by operating the rod 7.

Further, in the present embodiment, the rod 7 can be easily operated by providing the handle 11 on the rod 7. The handles 11 are provided at the top and bottom, and when the H-shaped steel 45 is built, either the appropriate handle 11 (at the time of connection) is used both when the building jig 1 and the H-shaped steel 45 are connected and when the connection is released. The rod 7 can be operated on the ground by the lower handle 11b and the upper handle 11a) when the connection is released.

Further, in the present embodiment, a stopper 25 for preventing the rotation of the rod 7 is provided. As a result, the connecting pin 21 comes out of the connecting plate 19 and the pin holes 23 and 59 of the connecting plate 19 and the H-shaped steel 45 due to the unintended rotation of the rod 7 when the H-shaped steel 45 is built, and the building jig 1 and the H-shaped steel 45 are built. It is possible to prevent the H-shaped steel 45 from coming off from the built-in jig 1 by breaking the connection with the 45.

In particular, in the present embodiment, the tip of the handle 11a is suppressed to the main body 2 side by the upper end 25a of the stopper 25, and the position of the handle 11a is fixed to prevent the rod 7 from rotating. Further, the protrusion 31 on the side surface of the stopper 25 is passed through the hook-shaped groove 29 provided on the side surface of the stopper holding portion 27, so that the stopper 25 is raised to a plurality of heights by the vertical movement of the stopper 25 and the rotation around the axis. (The height when the protrusion 31 is at the lowermost end of the straight portion 29a as shown in FIG. 1 and the height when the protrusion 31 is arranged at the bent portion 29b as shown in FIG. 6). The state in which the rotation of the rod 7 is prevented by the stopper 25 and the state in which the rotation of the rod 7 is released can be switched by the height of the stopper 25.

Further, since the arm 13 is provided on the rod 7 and the arm 13 is rotatably connected to the pin holding portion 15 that holds the connecting pin 21, the rotation of the rod 7 is rotatably connected to the connecting pin 21 by a crank type mechanism. It can be converted to motion more reliably, and the connection between the built-in jig 1 and the H-shaped steel 45 can be connected and disconnected more reliably.

Further, in the present embodiment, an appropriate one is selected from the plurality of adjusting holes 39 of the height adjusting plate 37 and used for mounting the fixing jig 55 for fixing the built-in jig 1. The jig 1 can be fixed at an appropriate height according to the built-in depth of the H-shaped steel 45. Further, when the built-in jig 1 is diverted to build a plurality of H-shaped steels 45 at different depths, the built-in jig 1 can be fixed at an appropriate height according to each depth. ..

However, the present invention is not limited to this. For example, in the present embodiment, the main body 2 of the built-in jig 1 is an H-shaped steel having the same cross-sectional dimensions as the H-shaped steel 45, but the main body 2 and the H-shaped steel 45 do not have the same cross-sectional dimensions. It is often possible to compensate for the difference in cross-sectional dimensions by using spacers or the like.

For example, in the example of FIG. 11, the H-shaped steel 45 (distance between the outer surfaces of both flanges 47) is larger than the main body 2 of the built-in jig 1, but in this case, the fastener 43 is removed and the sandwiching plate 41 is used. Is once removed from the flange 3, one or more plate-shaped spacers 63 (sim plates) are placed between the flange 3 and the sandwiching plate 41, and the sandwiching plate 41 and the spacer 63 are reattached to the flange 3 by the fastener 43. Fixed to.

The separation between the sandwiching plates 41 can be adjusted according to the cause of the H-shaped steel 45 depending on the thickness and the number of spacers 63, and the H-shaped steel 45 is appropriately sandwiched by the sandwiching plate 41 to prevent the displacement of the H-shaped steel 45. Can be prevented. Further, when a plurality of H-shaped steels 45 having different causes are built by diverting the building jig 1, the H-shaped steels 45 can be appropriately sandwiched according to each cause.

However, if the cause of the H-shaped steel 45 to be built using the building jig 1 is uniform, even if the cause of the main body 2 is aligned with the H-shaped steel 45 and the sandwiching plate 41 is welded and fixed to the flange 3. good. Alternatively, if the H-shaped steel 45 can be connected in a stable state only with the connecting pin 21, the sandwiching plate 41 can be omitted.

Further, in the present embodiment, the main body 2 of the built-in jig 1 is made of H-shaped steel, but the present invention is not limited to this, and the cross-sectional shape may be rectangular or circular as long as the rigidity is the same as that of the H-shaped steel 45. .. Further, the steel material to be built by the building jig 1 is not limited to the H-shaped steel 45. These cross-sectional shapes may be any combination as long as the main body 2 of the built-in jig 1 and the steel material can be connected by the connecting pin 21.

Further, in the present embodiment, the rotational movement of the rod 7 is converted into the movement of putting in and out of the connecting pin 21 by a crank type mechanism including the arm 13 and the pin holding portion 15, but the conversion mechanism is not limited to this. For example, it is also possible to use a rotary gear or the like.

Further, the means for preventing the rotation of the rod 7 is not limited to the one using the stopper 25. If the rod 7 does not rotate during construction, another stopper may be used.

Further, in the present embodiment, an appropriate adjusting hole 39 of the height adjusting plate 37 is selected and the fixing jig 55 is attached, whereby the fixing height of the building jig 1 is set to the building depth of the H-shaped steel 45. However, if the position of the top end of the H-shaped steel 45 to be built using the built-in jig 1 is uniform, the fixing jig 55 is set to an appropriate height of the flange 3 of the built-in jig 1. May be welded and fixed.

Further, although the construction example of the structural Shinbashira has been described in this embodiment, the built-in jig 1 can be applied to other construction. For example, it can be applied to the core material of cast-in-place concrete piles and the core material of continuous underground walls such as soil cement walls when building steel materials.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified examples or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1: Built-in jig 2: Main body 7: Rod 9: Rod holding portions 11, 11a, 11b: Handle 13: Arm 15: Pin holding portion 19: Connecting plate 21: Connecting pins 23, 59: Pin holes 25: Stopper 27: Stopper holding part 29: Groove 31, 31a, 31b: Protrusion part 33: Lock part 37: Height adjustment plate 39: Adjustment hole 41: Sandwich plate 45: H-shaped steel 51: Ground 53: Excavation part 55: Fixed Jig 57: Structural pillar pile 58: Backfill soil 63: Spacer

Claims (6)

A building jig that is connected to a steel material and used to build the steel material.
The columnar body and
With the rods arranged along the axial direction of the main body,
A pair of connecting plates provided at the lower end of the main body for inserting the steel material between them,
By rotating the rod around the axis, a pair of connecting plates and a connecting pin inserted into and out of a pin hole provided in the steel material inserted between the pair of connecting plates and a connecting pin.
A stopper to prevent the rod from rotating around its axis,
Equipped with
A built-in jig characterized in that a plurality of handles projecting laterally from the rod are provided above and below the rod. The built-in jig according to claim 1, wherein the stopper fixes the position of the handle. The stopper is a rod-shaped member that can move up and down and rotate around an axis, and is provided with a protrusion on a side surface.
The built-in jig according to claim 2, wherein the protrusion is passed through a hook-shaped groove provided on a side surface of a cylindrical holding portion through which the stopper is passed. An arm is provided on the rod,
The build-in jig according to any one of claims 1 to 3, wherein the arm is rotatably connected to a pin holding portion that holds the connecting pin. A plate is attached along the axial direction of the main body,
The build-in jig according to any one of claims 1 to 4, wherein the plate is provided with a plurality of holes at intervals in the axial direction of the main body. A pair of sandwiching plates for sandwiching the steel material are provided at the lower end of the main body.
The built-in jig according to any one of claims 1 to 5, wherein one or a plurality of plate-shaped spacers are arranged between the main body and the sandwiching plate.

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