JP7716223B2 - Building material holding jig - Google Patents

Description

The present invention relates to a building material holding jig.

Patent Document 1 below shows a handling machine for moving and positioning various building materials.

Japanese Patent Application Publication No. 11-247454

The handling machine in Patent Document 1 is equipped with a gripping attachment that grips building materials. This gripping attachment can be finely adjusted in each direction, including left and right, tilt, and left and right inclination, by operating a handling control lever.

Examples of building materials that can be gripped by such handling machines include plate-shaped components such as steel plates. Since the size of steel plates varies depending on the attachment location, it is desirable for a single gripping attachment to be able to grip steel plates of various sizes.

Here, for example, if the distance between the gripping parts of the gripping attachment is short compared to the size of the steel plate, a large moment acts on the gripping part. On the other hand, if the distance between the gripping parts is long compared to the size of the steel plate, it may not be possible to grip the steel plate with two gripping parts, and only one gripping part may be able to grip it. In such cases, a large moment acts on the gripping part.

Therefore, it is necessary to select a steel plate of a size that does not cause an excessive moment to act on the gripping part. In other words, there are restrictions on the size of the steel plate that can be gripped.

In consideration of the above, the present invention aims to provide a building material holding jig that can hold steel plates of various sizes.

One embodiment of a building material holding jig comprises a rod-shaped fixing member fixed to the arm of a transport machine that transports steel plates, a frame-shaped frame attached to the fixing member, and a plurality of magnets that are slidably attached to the frame along the frame and that detachably attract the steel plates, and the fixing member is arranged so that the mounting surface of the frame and the fixing surface to the arm are opposite each other.

In one embodiment of the building material holding jig, the magnet that secures the steel plate can slide along the frame. This allows the attachment position to be changed. This allows steel plates of various sizes and shapes to be held. Furthermore, even if the steel plate has irregularities or holes, the magnet can avoid these and hold the steel plate.
In one embodiment of the building material holding jig, the frame has a structural surface that is aligned with the axial direction of the fixing member, and the magnet attracts the steel plate whose in-plane direction is aligned with the structural surface of the frame.

The building material holding jig of claim 1 comprises a rod-shaped fixing member fixed to the arm of a transport machine that transports steel plates, a frame-shaped frame attached to the fixing member, and a plurality of magnets that are slidably attached to the frame along the frame and detachably attract the steel plates, the frame comprising a frame-shaped outer frame to which the magnets are attached, and a bar-shaped inner frame that is spanned across the outer frame at a position surrounded by the outer frame, and a magnet is also fixed to the inner frame, and the inner frame is slidable along the surface of the outer frame relative to the outer frame.

In the construction material holding jig described in claim 1 , the magnet fixed to the inner frame can slide along the surface of the outer frame together with the inner frame. This allows the attraction position of not only the outer magnet but also the inner magnet to be changed. This makes it possible to hold steel plates of various shapes. Furthermore, even if the steel plate has irregularities or holes, the magnet can avoid these and hold it.
In the construction material holding jig of claim 2, the frame has a structural surface that is aligned with the axial direction of the fixing member, and the magnet attracts the steel plate whose in-plane direction is aligned with the structural surface of the frame.

A building material holding jig of claim 3 is the building material holding jig of claim 1 , wherein the outer frame is formed with a cylindrical member formed in a cylindrical shape and a rod-shaped member inserted into the cylindrical member, and the size of the outer frame can be changed by changing the insertion depth of the rod-shaped member into the cylindrical member.

In the construction material holding jig described in claim 3 , the frame is formed of a cylindrical member and a rod-shaped member, and the size of the frame can be changed by changing the insertion depth of the rod-shaped member into the cylindrical member, thereby making it possible to hold steel plates of various sizes.

The building material holding jig of claim 4 comprises a rod-shaped fixing member fixed to the arm of a transport machine that transports steel plates, a frame-shaped frame attached to the fixing member, and a plurality of magnets that are attached to the frame so as to be slidable along the frame and that detachably attract the steel plates, a rail that extends from the fixing member in an out-of-plane direction of the frame and supports the frame so that it can move in the out-of-plane direction, and a cylinder attached to the fixing member and moves the frame in the out-of-plane direction.

In the construction material holding jig described in claim 4 , the frame is movably supported on rails that extend outward from the fixed member, and the frame can be moved in the outward direction by extending or contracting the cylinder. This allows the steel plate to be attached to the attachment surface with greater precision than in a case where the steel plate is attached to the attachment surface by moving a transporter or arm.

The building material holding jig of claim 5 is a building material holding jig according to any one of claims 1 to 4 , wherein the magnet has a rectangular adsorption surface and is rotatable along the in-plane direction of the frame.

In the construction material holding jig described in claim 5 , the rectangular magnet can not only move in the extension direction of the frame, but also rotate along the in-plane direction of the frame, making it easier to avoid irregularities or holes in the steel plate.
The building material holding jig of claim 6 is the building material holding jig of claim 3 , wherein the tubular members are formed in a gate shape and provided in pairs, the rod-shaped members are provided in pairs, and both ends of the rod-shaped members are inserted into each of the pair of opposing tubular members.
The building material holding jig of claim 7 is the building material holding jig of claim 4 , wherein the rail extends from the fixed member in one out-of-plane direction of the frame, and the cylinder is attached to the fixed member in the other out-of-plane direction of the frame.

This invention allows steel plates of various sizes to be gripped.

1 is a perspective view showing a mounting surface and a reinforcing steel plate that are reinforced using a steel plate transporting device to which a building material holding jig according to an embodiment of the present invention is applied. 1 is a side view showing a steel plate transporting device to which a building material holding jig according to an embodiment of the present invention is applied. 1 is a plan view showing a steel plate transporting device to which a building material holding jig according to an embodiment of the present invention is applied. 1 is a side view showing a building material holding jig according to an embodiment of the present invention. 1 is a front view showing a building material holding jig according to an embodiment of the present invention. FIG. 1A is a front view showing a fixing member of a building material holding jig according to an embodiment of the present invention, and FIG. 1B is a front view showing a frame. FIG. 2 is a front view showing a state in which the frame according to the embodiment of the present invention is enlarged. 5, with the magnet omitted, and FIG. 6B is a cross-sectional view taken along line AA of FIG. 5, showing the state in which the frame has been moved relative to the fixed member. 1A is a plan view showing a building material holding jig according to an embodiment of the present invention, and FIG. 1B is a plan view showing a state in which a frame has been moved relative to a fixing member. (A) is a cross-sectional view showing an example of a sliding mechanism for a tubular member and a rod-shaped member in a building material holding jig according to an embodiment of the present invention, and (B) is a cross-sectional view showing an example of a method for fixing the tubular member and the rod-shaped member.

The following describes a building material holding jig according to an embodiment of the present invention, with reference to the drawings. Components indicated with the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and multiple components may be present.

Furthermore, explanations of overlapping components and symbols may be omitted in each drawing. Note that the present invention is not limited to the following embodiments, and can be implemented by making appropriate modifications, such as omitting components or replacing them with different components, within the scope of the purpose of the present invention.

In each figure, the directions indicated by arrows X and Y are directions along a horizontal plane and are perpendicular to each other. Furthermore, the direction indicated by arrow Z is a direction along the vertical direction (up and down). In each figure, the directions indicated by arrows X, Y, and Z are assumed to coincide with each other.

<Mounting surface>
2 shows a steel plate transporting device 20 equipped with an attachment 40, which is a building material holding jig according to an embodiment of the present invention. The steel plate transporting device 20 is, as an example, a transporting and mounting device for transporting a steel plate 10 as a building material and fixing it to a mounting surface 12A of a reinforced object 12.

As shown in Figure 1, in this embodiment, the object to be reinforced 12 is a concrete pillar, and steel plates 10 are attached to reinforce it in order to improve earthquake resistance, etc. The object to be reinforced 12 can be a wall surface, a ceiling surface, or any other structure.

Prior to installing the steel plate 10, multiple anchor bolts 14 are installed on the mounting surface 12A of the reinforced object 12, where the steel plate 10 will be attached and reinforced. Furthermore, through holes 10A are formed in the steel plate 10 at positions corresponding to the anchor bolts 14.

When attaching the steel plate 10 to the mounting surface 12A, the anchor bolt 14 is inserted into the through hole 10A, and the steel plate 10 is brought into contact with the mounting surface 12A. A nut (not shown) is then screwed onto the anchor bolt 14, thereby attaching and securing the steel plate 10 to the mounting surface 12A.

<Steel plate transport device>
As shown in FIG. 2 , the steel plate transporting device 20 includes a transporter 22 , a steering unit 24 attached to the transporter 22 , an arm 30 , and an attachment 40 .

<Conveyor>
The transporter 22 is a vehicle that can be driven in a direction desired by an operator. The operator can start, stop, and change the direction and speed of the transporter 22 by operating the steering unit 24. The steering unit 24 is equipped with a handle for operation by the operator. The steering unit 24 is also formed to include a controller for operating the arm 30 and the like.

The transporter 22 is provided with an arm 30, and at the tip of the arm 30 is provided a hand unit 32 that detachably holds an attachment 40. In other words, the attachment 40 is fixed to the arm 30 via the hand unit 32.

(Arm and hand movement)
The arm 30 can be raised and lowered as shown by the arrow N1. By raising and lowering the arm 30, the positions of the attachment 40 fixed to the tip of the arm 30 via the hand unit 32 and the steel plate 10 in the vertical direction (Z direction) can be adjusted.

The arm 30 is also extendable, as indicated by arrow N2. By extending or retracting the arm 30, the positions of the attachment 40 fixed to the tip of the arm 30 via the hand unit 32 and the steel plate 10 in the fore-and-aft direction (X direction, the fore-and-aft direction of the transporter 22) can be adjusted.

As shown by arrow N3, the hand unit 32 can rotate (tilt) around the horizontal axis (Y direction, the width direction of the transporter 22). By tilting the hand unit 32, the vertical inclination of the attachment 40 and steel plate 10 fixed to the tip of the arm 30 via the hand unit 32 can be adjusted.

Furthermore, as shown by arrow N4 in the plan view of Figure 3, the hand unit 32 can rotate (swing) around the vertical direction (Z direction) as its rotation axis. By swinging the hand unit 32, the horizontal tilt of the attachment 40 and steel plate 10 fixed to the tip of the arm 30 via the hand unit 32 can be adjusted. Note that the extrusion mechanism 50 of the attachment 40, which will be described later, is not shown in Figure 3.

Furthermore, as shown by arrow N5 in Figure 5, the hand unit 32 can rotate (roll) around the horizontal axis (X direction, the front-to-rear direction of the transporter 22, see Figure 2). By rolling the arm 30, the in-plane tilt of the attachment 40 and steel plate 10 (see Figure 2, etc.) fixed to the tip of the arm 30 via the hand unit 32 can be adjusted.

As shown by arrow N6 in Figure 3, the transporter 22 can move its body laterally (Y direction, widthwise direction of the transporter 22) (lateral movement) without changing the position of the tires. By moving the transporter 22 laterally, the lateral position (Y direction, widthwise direction of the transporter 22) of the attachment 40 and steel plate 10 fixed to the tip of the arm 30 via the hand unit 32 can be adjusted.

<Attachment>
As shown in FIGS. 4 and 5 , the attachment 40 includes a fixing member 42 , a frame 44 , a magnet 46 , a rail 48 , and a pushing mechanism 50 .

(Fixing member)
6A, the fixing member 42 is a steel rod-like member having a square cylindrical shape that is fixed to the arm 30 via the hand portion 32. The fixing member 42 may also be formed from a solid block of lumber.

As shown in FIG. 4, four protrusions 42A are fixed to the fixed member 42, protruding in the horizontal direction (X direction, the front-to-rear direction of the transporter 22) and on the opposite side of the arm 30. Rails 48 are fixed to both sides of the protrusions 42A in the Y direction.

(Frame)
The frame 44 is a steel frame-shaped member fixed to the fixed member 42 via rails 48. As shown in Fig. 6(B) , the frame 44 includes a frame-shaped ("R"-shaped) outer frame 44A and a bar-shaped (straight) inner frame 44B.

The outer frame 44A is further formed with a cylindrical member 44AA that forms both ends of the outer frame 44A, and a rod-shaped member 44AB that is inserted into the cylindrical member 44AA and forms the center of the outer frame 44A.

A pair of cylindrical members 44AA are provided, and each cylindrical member 44AA is formed in a gate shape (a "C" shape). The end of the cylindrical member 44AA, which extends in the Y direction in Figure 6(B), has a protrusion that extends along the X direction, and this protrusion is formed in a cylindrical shape.

A pair of rod-shaped members 44AB are provided, with both ends inserted into the protruding portions of the opposing cylindrical member 44AA. Both ends of the rod-shaped member 44AB and the protruding portions of the cylindrical member 44AA are fixed together using bolts.

The insertion depth of the rod-shaped member 44AB into the cylindrical member 44AA can be freely set. The bolt fixing position between the cylindrical member 44AA and the rod-shaped member 44AB is also variable. Therefore, as shown by arrow K1, the cylindrical member 44AA can slide relative to the rod-shaped member 44AB, allowing it to be fixed as needed.

As a result, as shown in Figure 7, for example, a pair of cylindrical members 44AA can be positioned farther apart from each other than in the state shown in Figures 5 and 6(B) and fixed to the rod-shaped member 44AB.

Here, one example of a configuration that allows the cylindrical member 44AA to slide relative to the rod-shaped member 44AB and be appropriately fixed is a configuration in which multiple through holes H2 are formed in the cylindrical member 44AA along the material axis direction of the cylindrical member 44AA, as shown in Figure 10(A). In addition, at least one through hole H1 is formed in the rod-shaped member 44AB.

Then, as shown in Figure 10(B), a bolt is inserted into either through hole H1 or through hole H2. By changing the through hole H2 through which the bolt is inserted, the cylindrical member 44AA can slide relative to and be fixed to the rod-shaped member 44AB.

It is also possible to form one through-hole in the cylindrical member 44AA and two or more through-holes in the rod-shaped member 44AB. This configuration of the cylindrical member 44AA and the rod-shaped member 44AB can be applied between various members that are "slidable" in this embodiment.

As shown in Figure 6(B), the inner frame 44B is a member that spans the outer frame 44A at a position surrounded by the outer frame 44A.

The inner frame 44B includes an axle 44BA, a slide 44BB, and a connecting portion 44BC. The axle 44BA is a rod-shaped member that spans the rod-shaped member 44AB of the outer frame 44A.

The slide portion 44BB is a pair of cylindrical members fixed to both ends of the shaft portion 44BA and through which the rod-shaped member 44AB is inserted.

The slide portion 44BB and rod-shaped member 44AB are fixed using bolts, but the fixed position is variable. Therefore, as shown by arrow K2, the inner frame 44B is slidable relative to the rod-shaped member 44AB and can be fixed as needed. In other words, the inner frame 44B is slidable in the in-plane direction of the outer frame 44A and can be fixed as needed.

A pair of connecting portions 44BC are provided in the center portion of the shaft portion 44BA. As shown in Figure 5, each connecting portion 44BC is positioned on either side of the protruding portion 42A of the fixing member 42, and the rail 48 is fixed to each connecting portion 44BC.

(rail)
The rail 48 is a slide rail, and as shown in Figures 8 (A) and (B), it comprises a first rail 48A fixed to the protrusion 42A of the fixing member 42 and a second rail 48B fixed to the connecting portion 44BC of the inner frame 44B.

The first rail 48A and the second rail 48B are arranged to interlock with each other and, while in contact with each other, can move in the front-to-rear direction (X direction, the front-to-rear direction of the transporter 22) as indicated by arrows K3 (see Figure 8(A)) and K4 (see Figure 8(B)). Relative movement of the first rail 48A and the second rail 48B causes the frame 44 to move relative to the fixed member 42.

Ball bearings or the like are provided between the first rail 48A and the second rail 48B. The lengths of the first rail 48A and the second rail 48B can be adjusted appropriately to adjust the stroke, and the rail 48 may also be formed by combining three or more rails.

As shown in Figure 5, four sets of rails 48 are provided for each inner frame 44B. This allows the frame 44 to move stably relative to the fixed member 42.

(cylinder)
As shown in Fig. 6B, a push-out mechanism 50 is fixed to each of the cylindrical members 44AA of the outer frame 44A. As shown in Figs. 9A and 9B, the push-out mechanism 50 is formed with a cylinder 54 and a moving member 52 that is moved by the cylinder 54.

The cylinder 54 is an electric cylinder, and one end is fixed to the surface of the fixed member 42 facing the arm 30 (not shown, upper side of the paper in Figure 9(A)). The other end of the cylinder 54 is fixed to the moving member 52.

The moving member 52 is formed with two end plates 52A and 52B and a connecting member 52C that connects the end plates 52A and 52B together.

A cylinder 54 is positioned between end plates 52A and 52B, with the end of the cylinder 54 fixed to the surface of end plate 52A facing end plate 52B. A frame 44 is fixed to the surface of end plate 52B opposite end plate 52A.

Here, Figure 9(A) shows the cylinder 54 in its most extended state. When the cylinder 54 is retracted from this state as indicated by arrow K5, as shown in Figure 9(B), the fixed member 42 fixed to the transporter 22 does not move, while the movable member 52 and the frame 44 fixed to the movable member 52 move forward (in the X direction, toward the front of the transporter 22).

Similarly, when the cylinder 54 is extended from the state shown in Figure 9(B) as indicated by arrow K6, the fixed member 42 fixed to the transporter 22 does not move, while the movable member 52 and the frame 44 fixed to the movable member 52 move rearward (X direction, rearward of the transporter 22), as shown in Figure 9(A).

(magnet)
As shown in Fig. 5, a plurality of magnets 46 that detachably attract the steel plate 10 are attached to the frame 44. As also shown in Figs. 9(A) and 9(B), the magnet 46 is formed to include a magnet body 46A, a shaft portion 46B, and a fixing portion 46C.

The magnet body 46A is a part that can fix the steel plate 10 (see Figure 2, etc.) by magnetic force, and as shown in Figure 5, the part that comes into contact with the steel plate 10 (the attraction surface) is rectangular. The magnetic force of the magnet body 46A can be switched manually.

The fixed portion 46C is the portion that is fixed to the frame 44. Here, in the magnet 46 attached to the outer frame 44A, the portion of the fixed portion 46C that is fixed to the frame 44 is formed in a cylindrical shape. This allows the magnet 46 to be slidably fixed to the outer frame 44A, as shown by arrow K7 in Figure 5.

On the other hand, the magnet 46 attached to the inner frame 44B is positioned so as to straddle the protrusion 42A of the fixed member 42 and does not slide relative to the inner frame 44B.

The magnet 46, whose fixed portion 46C is cylindrical, may be attached anywhere on the cylindrical member 44AA of the outer frame 44A. The magnet 46 may also be attached to the rod-shaped member 44AB. Furthermore, the magnet 46 may also be attached to the inner frame 44B.

As shown in Figures 9(A) and 9(B), the shaft portion 46B of the magnet 46 is a connecting member that connects the magnet main body 46A and the fixed portion 46C, and can rotate around the X direction. This allows the magnet main body 46A to rotate in the in-plane direction of the frame 44, as shown by arrows K8 and K9 in Figure 5.

<Action and effect>
In the attachment 40 as a building material holding jig according to an embodiment of the present invention, the magnet 46 that secures the steel plate 10 (see FIG. 2, etc.) can slide along the outer frame 44A of the frame 44, as shown by the arrow K7 in FIG.

This allows the position at which the steel plate 10 is attracted to be changed, making it possible to hold steel plates of various sizes and shapes. Furthermore, even if the steel plate has irregularities or holes (for example, through-hole 10A in steel plate 10), these can be avoided and the magnet 46 can hold it.

Furthermore, in the attachment 40 according to an embodiment of the present invention, the magnet 46 attached to the inner frame 44B shown in Figure 5 can slide along the surface of the outer frame 44A together with the inner frame 44B (arrow K2 in Figure 6).

As a result, it is possible to change the attraction position of not only the outer magnet 46 (magnet 46 attached to outer frame 44A) shown in Figure 5, but also the inner magnet 46 (magnet 46 attached to inner frame 44B).

This allows steel plates of various shapes to be held. Furthermore, even if the steel plate has irregularities or holes (for example, through-hole 10A in steel plate 10), these can be avoided and the plate can be held by the magnet.

In addition, in the attachment 40 according to an embodiment of the present invention, the outer frame 44A of the frame 44 is formed from a cylindrical member 44AA and a rod-shaped member 44AB. The size of the frame 44 can be changed by changing the insertion depth of the rod-shaped member 44AB into the cylindrical member 44AA. This allows steel plates of various sizes to be held.

Furthermore, in the attachment 40 according to an embodiment of the present invention, as shown in Figures 8(A) and (B), the frame 44 is movably supported on rails 48 that extend outward from the fixed member 42.

By extending and retracting the cylinder 54 as shown by arrows K5 and K6 in Figures 9(A) and 9(B), the frame 44 can be moved out of the plane as shown by arrows K3 and K4 in Figure 8. Therefore, compared to a method in which the steel plate 10 is attached to the attachment surface 12A by moving the transporter 22 or arm 30, the steel plate 10 can be attached to the attachment surface 12A with greater precision.

Furthermore, in the attachment 40 according to an embodiment of the present invention, the rectangular magnet body 46A can not only move in the extension direction of the frame 44 as shown by arrow K7 in Figure 5, but can also rotate along the in-plane direction of the frame 44 as shown by arrows K8 and K9. This makes it easier to avoid irregularities or holes in the steel plate 10.

<Other embodiments>
In the attachment 40 according to an embodiment of the present invention, the outer frame 44A of the frame 44 is formed of a tubular member 44AA and a rod-shaped member 44AB, and the size of the outer frame 44A is variable, but embodiments of the present invention are not limited to this.

For example, the outer frame 44A may be configured so that its size does not change. Even if the size of the outer frame 44A does not change, as long as the magnet 46 can slide along the frame 44, the effect of being able to hold steel plates of various sizes can be achieved.

Similarly, in the attachment 40 according to an embodiment of the present invention, the inner frame 44B is slidable along the in-plane direction of the outer frame 44A, but embodiments of the present invention are not limited to this.

For example, even if the inner frame 44B is not slidable relative to the outer frame 44A, as long as the magnet 46 can slide along the frame 44, it will still be possible to hold steel plates of various sizes.

Furthermore, while the attachment 40 in the present invention is equipped with rails 48 and cylinders 54, embodiments of the present invention are not limited to this. For example, the attachment 40 does not necessarily have to be equipped with rails 48 and cylinders 54. Even without the rails 48 and cylinders 54, the steel plate 10 can be attached to the attachment surface 12A by moving the transport machine 22 or arm 30.

Furthermore, in the attachment 40 of the present invention, the attraction surface of the magnet body 46A does not necessarily have to be rectangular. Furthermore, the magnet body 46A does not necessarily have to be rotatable. Even if the attraction surface of the magnet body 46A is not rectangular or rotatable, as long as it can slide along the frame 44, the effect of being able to hold steel plates of various sizes can be achieved.

10 Steel plate 30 Arm 40 Attachment (building material holding jig)
42 Fixed member 44 Frame 44A Outer frame 44AA Cylindrical member 44AB Rod-shaped member 44B Inner frame 46A Magnet main body (magnet)
48 Rail 54 Cylinder

Claims (7)

a rod-shaped fixing member fixed to an arm of a conveyor that conveys steel plates;
a frame attached to the fixing member;
a plurality of magnets attached to the frame so as to be slidable along the frame and detachably attract the steel plate;
Equipped with
The frame is
an outer frame to which the magnet is attached;
a bar-shaped inner frame that is spanned across the outer frame at a position surrounded by the outer frame,
A magnet is also fixed to the inner frame, and the inner frame is slidable relative to the outer frame along the surface of the outer frame.
Building material holding fixture. the frame has a structural surface along the axial direction of the fixing member,
The magnet attracts the steel plate whose in-plane direction is along the structural surface of the frame.
The construction material holding jig according to claim 1 . The outer frame is
A cylindrical member formed in a cylindrical shape;
a rod-shaped member inserted into the cylindrical member,
The size of the outer frame can be changed by changing the insertion depth of the rod-shaped member into the tubular member.
The construction material holding jig according to claim 1 . a rod-shaped fixing member fixed to an arm of a conveyor that conveys steel plates;
a frame attached to the fixing member;
a plurality of magnets attached to the frame so as to be slidable along the frame and detachably attract the steel plate;
Equipped with
a rail that protrudes from the fixed member in an out-of-plane direction of the frame and supports the frame movably in the out-of-plane direction;
a cylinder attached to the fixed member and configured to move the frame in the out-of-plane direction;
A building material holding jig comprising: The magnet has an attraction surface that is rectangular and is rotatable along an in-plane direction of the frame.
The building material holding jig according to any one of claims 1 to 4 . The cylindrical members are formed in a gate shape and provided in pairs.
The rod-shaped members are provided in pairs,
Both ends of the rod-shaped member are inserted into the pair of opposing cylindrical members, respectively.
The construction material holding jig according to claim 3 . the rail extends from the fixed member toward one side of the frame in an out-of-plane direction;
The cylinder is attached to the fixed member on the other side of the frame in the out-of-plane direction.
The construction material holding jig according to claim 4 .