Reinforcement jigs, wires with reinforcement jigs, and reinforcement lifting devices

Abstract

To provide a rebar placement jig, a wire with a rebar placement jig, and a rebar placement lifting device that enable safe and efficient rebar placement work. [Solution] A jig for holding reinforcing bars by inserting a wire 6 into a wire hole 3c and locking it to a wire 6 provided with a locking member 60, comprising a hook member 2, a retaining member 3, a hexagonal bolt 4, and a pin 5. The hook member 2 is composed of two straight sections extending linearly downward from the base and tip ends, and a curved holding section. The retaining member 3 has a retaining section 3a for opening and closing the opening of the hook member 2, a through hole for inserting the hexagonal bolt 4, a wire hole 3c, and a protrusion 3d. The hexagonal bolt 4 is used as a fastener and consists of a screw head, a cylindrical section, and a male screw section. The pin 5 is used to prevent the hexagonal bolt 4 from rotating or loosening after the hook member 2 and the retaining member 3 have been fixed together using the hexagonal bolt 4.

Description

Technical Field

[0001] The present invention relates to a lifting tool used for steel bar placement work such as wall horizontal bars of structures and hoop bars of deep foundation piles.

Background Art

[0002] In the steel bar placement work of wall horizontal bars such as structures, underground parts, water purification plants, treatment facilities, etc., and hoop bars of deep foundation piles, it is necessary to place a large number of steel bars. However, it is cumbersome to place thick steel bars one by one. Therefore, a horizontal bar receiver in which a large number of hook-shaped horizontal bar receivers are arranged side by side at appropriate intervals on a horizontal bar support is known (see Patent Document 1). Also, regarding prestressed tendons, a loading and unloading tool is known in which a plurality of wires are suspended from a suspension beam, and hook fittings are fastened to each wire at substantially the same interval as the arrangement of the prestressed tendons (see Patent Document 2). However, since the upper part of the hook-shaped member of the horizontal bar receiver of Patent Document 1 and the loading and unloading tool of Patent Document 2 is open, there is a risk that steel bars or prestressed tendons may accidentally fall from the opening during operations such as lifting.

[0003] Therefore, there is known a lifting device for horizontal bar placement that not only attaches hooks capable of holding horizontal bars at intervals corresponding to the bar placement interval, but also includes a stopper for preventing the horizontal bars from falling off and a spring for biasing the stopper in the direction of pressing the horizontal bars (see Patent Document 3). This has a structure in which the horizontal bar is held by the hook and the sling is lifted, and the tip of the stopper is biased in the direction of pressing the horizontal bar by the lifting load, and it is said that the horizontal bar can be prevented from falling off. However, the lifting device for horizontal bar placement of Patent Document 3 functions when the horizontal bar is held by the hook, but when the load is suddenly lost, such as when the horizontal bar suddenly rises from the hook, the function of pressing the horizontal bar is lost at the same time, and as a result, there is a problem that the horizontal bar falls off from the hook.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Application Laid-open No. 61-172967 [Patent Document 2] Publication No. 53-078039 [Patent Document 3] Japanese Patent Publication No. 2001-049868 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In view of these circumstances, the present invention aims to provide a rebar placement jig, a wire with a rebar placement jig, and a rebar placement lifting device that enable safe and efficient rebar placement work. [Means for solving the problem]

[0006] To solve the above problems, the rebar placement jig of the present invention is a rebar placement jig that inserts a wire into a wire hole, locks the wire, and holds the rebar, comprising a hook member which is U-shaped or U-shaped overall and has a holding part which has a curved or bent bottom to hold the rebar, a retaining member which has a retaining part which opens and closes the opening of the hook member and a through hole, and a fastener which is inserted through the through hole of the retaining member on the base end side of the hook member to secure the upper end, and when the upper opening of the hook member is facing upward and the bottom is facing downward, the retaining member can rotate or slide on a substantially horizontal plane relative to the hook member to open and close the opening. As the retaining member rotates on a substantially horizontal plane, even if the reinforcing bar being held unexpectedly lifts up while the retaining part is closed, the retaining member will not move vertically, thus preventing the reinforcing bar from falling. Another example of a configuration in which the retaining member slides on a substantially horizontal plane is to provide a sliding mechanism between the hook member and the retaining member. The material of each component is not particularly limited, but it is preferable that they all be made of metal in order to maintain strength. The reinforcing bars to be held are horizontal bars and hoop bars, and the reinforcing jig of the present invention can be used in a wide range of applications, such as horizontal reinforcement in the walls of structures, hoop bars in deep foundation piles, walls in underground sections, and reinforcement in the walls of water treatment plants and facilities. The cross-sectional shape of the hook member is not particularly limited; it can be rectangular, circular, or elliptical. The retaining member may be attached by passing a fastener through the through hole, or by passing the base end of the hook member through the through hole. Preferably, the fastener is fixed from above the hook member.

[0007] In the reinforcement jig of the present invention, the hook member preferably has a fixing portion on its base end for fixing a fastener, and the retaining member preferably has a through hole into which the fastener or hook member is fitted, and is slidable between a part of the fastener and a part of the hook member in the axial direction of the fastener, and is rotatable around the axis of the fastener. That is, the retaining member is loosely fitted with the fastener or hook member and is able to slide or rotate. By making the retaining member slidable, it becomes possible to restrict the rotation of the retaining member by frictional force with the fastener, or to provide a locking mechanism that restricts the rotation of the retaining member. Here, for example, if a hexagonal bolt is used as a fastener and the retaining member is attached by passing the through-hole through the fastener, then part of the fastener refers to the lower end of the screw head of the hexagonal bolt, and part of the hook member refers to the upper end of the base side of the hook member. Also, if a cap member is used as a fastener and the retaining member is attached by passing the through-hole through the base side of the hook member, then part of the fastener refers to the lower end of the screw head of the cap member, and part of the hook member refers to the locking portion provided on the base side of the hook member.

[0008] In the rebar placement jig of the present invention, the retaining member may be provided with a first engaging portion, and the fastener may be provided with a second engaging portion. When the retaining member comes into contact with a part of the fastener, the first engaging portion and the second engaging portion engage, preventing the rotation of the retaining member and maintaining the closed state of the hook member. A locking mechanism can be configured by providing a first engaging portion and a second engaging portion.

[0009] In the rebar placement jig of the present invention, it is preferable that the wire hole be provided in the retaining member. This allows the rebar placement jig of the present invention to be attached to a wire with a locking member, so that the load causes the retaining member to come into contact with the locking member, and the load from the hook member and fastener causes the retaining member to come into contact with a part of the fastener, thereby enabling the locking mechanism of the first engaging part and the second engaging part to function.

[0010] In the rebar arranging jig of the present invention, a part of the hook member is the base end of the hook member, the fixing part is a first female threaded part provided at the base end, and the fastener is a hexagonal bolt consisting of a screw head, a cylindrical part, and a first male threaded part. The hexagonal bolt is inserted through the through hole from above, and the first male threaded part and the first female threaded part are screwed together and fixed. Part of the fastener may also be the lower end of the screw head. By using a hexagonal bolt as the fastener, it is possible to manufacture it at a low cost. As the hexagonal bolt, a wide range of known hexagonal bolts having a screw head, a cylindrical part, and a male threaded part can be used. By using a hexagonal bolt having a cylindrical part, the sliding of the anti-detachment member in the vertical direction is facilitated. Note that a hexagonal bolt consisting of a screw head and a male threaded part and not having a cylindrical part may also be used.

[0011] In the reinforcement jig of the present invention, when a hexagonal bolt is used as a fastener, it is preferable that the second engaging portion is a part of the shape of the outer surface of the screw head, and the first engaging portion has a shape that engages with a part of that shape. By using the shape of the screw head of the hexagonal bolt to construct the locking mechanism, it is possible to manufacture it functionally and at low cost. As a part of the shape of the outer surface of the screw head, the planar part of the screw head is preferably used, but for example, the corner of the screw head may also be used.

[0012] In the reinforcement jig of the present invention, if a hexagonal bolt is used as a fastener and the second engaging portion is part of the shape of the outer surface of the screw head, it is preferable to further provide a pin for fixing the hexagonal bolt and the hook portion, with a first pin hole provided in the hook portion that penetrates the first female screw portion, and a second pin hole provided in the hexagonal bolt that penetrates the first male screw portion, and the pin is inserted so that the first and second pin holes are substantially in a straight line, and both ends of the pin are crimped and fixed. When a hexagonal bolt is used as a fastener, the orientation of the screw head will differ depending on the screwing state of the first male screw portion provided on the hexagonal bolt and the first female screw portion provided on the hook portion, and the shape of the outer surface of the screw head used as the second engaging portion will change. Therefore, when the second engaging portion is part of the shape of the outer surface of the screw head, by using a pin that is inserted through both the hook portion and the hexagonal bolt, the orientation of the screw head during fixing can be kept constant, and the locking mechanism can be made to function effectively.

[0013] In the rebar placement jig of the present invention, a part of the hook member is a locking portion provided on the base end side of the hook member, the fixing portion is a second male screw portion provided on the base end of the hook member, and the fastener is a cap member having a second female screw portion formed thereon. The base end side of the hook member is inserted into the through hole from below, and the second male screw portion and the second female screw portion are screwed together to fix it in place. Part of the fastener may also be the lower end of the cap member. By configuring the second male screw portion provided on the base end of the hook member to be screwed together with the second female screw portion provided on the cap member, the retaining member can be fixed using the shape of the hook member without using a hexagonal bolt. Furthermore, by providing a locking portion, the vertical sliding range of the retaining member can be limited, preventing the hook member from rising too high during use. While a known cap nut is preferably used as the cap member, a member with an open top, such as a hexagonal nut, may also be used.

[0014] In the rebar arranging jig of the present invention, when a cap member is provided as a fastener, it is preferable that the second engaging portion is a recess provided on the outer circumferential surface of the cap member, and the first engaging portion is a convex portion shaped to engage with the recess. The recess is provided on the cap member side for ease of processing; for example, the convex portion may be provided on the cap member side to serve as the second engaging portion, and the first engaging portion may be a recess. Furthermore, even when fixing to a hook member using a screw member such as a hexagonal bolt, in addition to when a cap member is provided as a fastener, the first engaging portion may be a convex portion and the second engaging portion a recess, or the first engaging portion may be a recess and the second engaging portion a convex portion. Even when a cap member is provided as a fastener, the second engaging portion may be a part of the shape of the outer surface of the screw head of a cap nut or hexagonal nut, and the first engaging portion may have a shape that engages with a part of said shape.

[0015] The wire with a rebar jig of the present invention has multiple rebar jigs attached to it, each secured at a predetermined interval by locking members. By connecting the rebar jigs on the wire at predetermined intervals, accurate assembly is possible during rebar placement work, improving the quality of construction. The predetermined interval can be appropriately designed depending on the type of rebar to be held and the construction target.

[0016] The rebar placement lifting device of the present invention has multiple wires with rebar placement jigs suspended from a lifting beam. This makes it easy to connect the rebars in a curtain-like manner at predetermined intervals, lift them all at once, and guide them to the rebar placement position for placement. The number of wires with rebar placement jigs to be suspended can be appropriately designed depending on the rebars to be held and the construction target. [Effects of the Invention]

[0017] The rebar placement jig, rebar placement jig with wire, and rebar placement lifting device of the present invention have the effect of enabling safe and efficient rebar placement work. [Brief explanation of the drawing]

[0018] [Figure 1] Perspective view of the steel bar arranging jig of Example 1 [Figure 2] Exploded perspective view of the steel bar arranging jig of Example 1 [Figure 3] Exploded front view of the steel bar arranging jig of Example 1 [Figure 4] Explanatory drawing of the hook member of Example 1 [Figure 5] Explanatory drawing of pin installation [Figure 6] Image diagram of using the steel bar arranging jig of Example 1 [Figure 7] Explanatory drawing 1 of attaching a steel bar to the steel bar arranging jig of Example 1 [Figure 8] Explanatory drawing 2 of attaching a steel bar to the steel bar arranging jig of Example 1 [Figure 9] Explanatory drawing 3 of attaching a steel bar to the steel bar arranging jig of Example 1 [Figure 10-1] Image diagram 1 of attaching a steel bar to the steel bar hanging tool [Figure 10-2] Image diagram 2 of attaching a steel bar to the steel bar hanging tool [Figure 11] Functional explanatory drawing 1 of the steel bar arranging jig of Example 1 [Figure 12] Functional explanatory drawing 2 of the steel bar arranging jig of Example 1 [Figure 13] Perspective view of the steel bar arranging jig of Example 2 [Figure 14] Front view of the steel bar arranging jig of Example 2 [Figure 15] Image diagram of using the steel bar arranging jig of Example 2 [Figure 16] Front view of the steel bar arranging jig of Example 3 [Figure 17] Explanatory drawing of attaching a steel bar to the steel bar arranging jig of Example 3

Mode for Carrying Out the Invention

[0019] Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. The scope of the present invention is not limited to the following examples and illustrated examples, and many changes and modifications are possible.

Example

[0020] Figure 1 shows an external perspective view of the reinforcement jig of Embodiment 1. As shown in Figure 1, the reinforcement jig 1 of Embodiment 1 is a jig that holds reinforcing bars (not shown) by inserting a wire 6 into a wire hole 3c and locking it to the wire 6 with a locking member 60 provided on it, and consists of a hook member 2, a retaining member 3, a hexagonal bolt 4 and a pin 5. The hook member 2, retaining member 3, hexagonal bolt 4 and pin 5 are all made of metal. The locking member 60 is also made of metal and is inserted through the wire 6 and then crimped and fixed in place.

[0021] Figure 2 shows an exploded perspective view of the reinforcement jig of Example 1, and Figure 3 shows an exploded front view of the reinforcement jig of Example 1. Figure 4 shows an explanatory diagram of the hook member of Example 1. As shown in Figure 3, the hook member 2 is composed of two straight sections extending linearly downward from the base end 23 or the tip end 24, and a curved holding section 2a, and is integrally molded, giving it a generally U-shape overall. The thickness T1 on the base end 23 side is formed to be thicker than the thickness T2 of the tip end 24, and the thickness of the holding section 2a gradually decreases from the base end 23 side to the bottom. By forming the tip end 24 side to be thicker, the strength of the member can be maintained while providing the female screw portion 2b. As shown in Figure 2, the hook member 2 has a rectangular cross-sectional shape. Unlike hook members with a circular cross-sectional shape, the holding portion 2a has a structure that can firmly hold the reinforcing bar to be held over a wider area. The shape and other dimensions of the holding portion 2a of the hook member 2 can be appropriately designed according to the type and size of the reinforcing bar to be held. As shown in Figure 4, the base end 23 side of the hook member 2 is provided with a female screw portion 2b for fixing a hexagonal bolt 4, which serves as a fixing portion (first female screw portion). Furthermore, as shown in Figure 2 or Figure 3, the hook member 2 is provided with a pin hole 2c as a first pin hole, which connects to the female screw portion 2b. Although not shown here, the pin hole 2c is provided not only on the front side but also on the back side (see Figure 5(1)).

[0022] The retaining member 3 has a retaining portion 3a that opens and closes the opening 25 of the hook member 2, a through hole 3b into which a hexagonal bolt 4 is inserted, a wire hole 3c, and a protrusion 3d as a first engaging portion. The retaining portion 3a and the wire hole 3c are provided in opposing positions via the through hole 3b. The presence of a wire hole 3c in the retaining member 3 allows the rebar jig 1 to be attached to the wire 6 with the locking member 60. The load causes the retaining member 3 to contact the locking member 60, and the load from the hook member 2 and the hexagonal bolt 4 causes the retaining member 3 to contact a portion of the hexagonal bolt 4, thereby enabling the locking mechanism of the first and second engaging parts to function (see Figure 6(1)). The retaining portion 3d has a flat contact portion so as to engage with the flat portion of the outer circumferential surface of the screw head 4a.

[0023] The hexagonal bolt 4 is used as a fastener to attach the retaining member 3 to the hook member 2 and secure it from above. A known hexagonal bolt consisting of a screw head 4a, a cylindrical portion 4b, and a male screw portion 4c is used. The use of the hexagonal bolt 4 as a fastener makes it possible to manufacture at a low cost. The screw head 4a is not only used when screwing the hexagonal bolt 4 into the hook member 2, but is also used as a second engagement part. In other words, in this embodiment, the planar portion of the outer surface of the screw head 4a functions as the second engagement part. By using the shape of the screw head of the hexagonal bolt to construct the locking mechanism, it is possible to manufacture it functionally and at low cost. While a wide range of known hexagonal bolts can be used as fasteners, it is preferable to use hexagonal bolts that have a cylindrical portion 4b, such as hexagonal bolt 4. Having a cylindrical portion 4b facilitates the sliding and rotation of the retaining member 3 during use. The male screw portion 4c corresponds to the first male screw portion, and a through-hole pin hole 4d is provided as the second pin hole. The hexagonal bolt 4 is inserted through the through hole 3b from above, and then the first male threaded portion, the male threaded portion 4c, and the first female threaded portion, the female threaded portion 2b, are screwed together and fixed in place.

[0024] The pin 5 is used to prevent the hex bolt 4 from rotating or loosening after the hook member 2 and the retaining member 3 have been fixed together using the hex bolt 4. Figure 5 is an explanatory diagram for pin installation, where (1) shows the state before pin insertion, (2) shows the state after pin insertion, and (3) shows the state after pin is fixed. As shown in Figure 5(1), the male threaded part 4c of the hexagonal bolt 4 is screwed into the female threaded part 2b of the hook member 2, and the pair of pin holes 2c and pin hole 4d are made to be approximately in a straight line, and then the pin 5 is inserted in the order of one pin hole 2c, pin hole 4d, and the other pin hole 2c, resulting in the state shown in Figure 5(2). In this state, as shown in Figure 5(3), each end (5a, 5b) of the pin 5 is crimped and fixed. As in this embodiment, when a hexagonal bolt 4 is used as a fastener, depending on the state of the threading between the male threaded portion 4c on the hexagonal bolt 4 and the female threaded portion 2b on the hook portion 2, the orientation of the screw head 4a may not be constant, and there is a risk that the shape of the outer surface of the screw head 4a used as the second engaging portion will change. Therefore, when the second engaging portion is part of the shape of the outer surface of the screw head 4a, by using a pin 5 through which both the hook portion 2 and the hexagonal bolt 4 are inserted, the orientation of the screw head 4a during fixing can be kept constant, and the locking mechanism can be made to function effectively.

[0025] Figure 6 is an illustrative diagram of the use of the reinforcement jig in Example 1, where (1) is a front view and (2) is a perspective view. As shown in Figure 6(1) or (2), after assembling the reinforcement jig 1, the wire hole 3c of the retaining member 3 is inserted from above the wire 6 on which the locking member 60 is provided, and the retaining member 3 is locked from above to the upper end of the locking member 60. As shown in Figure 6(1), when the hexagonal bolt 4 is screwed into the hook portion 2 and fixed with the pin 5, the height H1 from the upper end of the hook portion 2 to the lower end of the screw head 4a is set higher than the height H2 of the through hole 3b. Therefore, after the assembly of the rebar jig 1, the retaining member 3 is not completely fixed to the hexagonal bolt 4 and the hook portion 2, and is able to slide up and down between the lower end of the screw head 4a and the upper end of the hook portion 2. In addition, the retaining member 3 is able to rotate around the cylindrical portion 4b (see Figure 3) with respect to the axis of the hexagonal bolt 4. The difference between height H1 and height H2 is greater than the height of the protrusion 3d, and is sized so that the reinforcing bar 7 does not fall out from the gap formed between the hook portion 2 and the retaining member 3 when the protrusion 3d and the screw head 4a engage. As mentioned above, since all the components of the reinforcement jig 1 are made of metal, as shown in Figure 6(1) or (2), when the reinforcement jig 1 is attached to the wire 6, the retaining member 3 is locked to the locking member 60 by its own weight, and the hexagonal bolt 4 and hook portion 2 are locked to the retaining member 3 by their own weight. More specifically, the retaining member 3 comes into contact with the screw head 4a, and the protrusion 3d, which is the first engaging portion, and the outer circumferential surface of the screw head 4a, which is used as the second engaging portion, engage to activate the locking mechanism. When locked, the rotation of the retaining member 3 is prevented, and the closed state of the hook portion 2 is maintained.

[0026] Next, the method for attaching reinforcing bars to the reinforcement jig in Example 1 will be described. Figures 7 to 9 are explanatory diagrams for attaching reinforcing bars to the reinforcement jig in Example 1, all showing the state in which the lock is released. Figure 7(1) is a front view with the opening closed, Figure 7(2) is a plan view with the opening closed, Figure 8(1) is a plan view with the opening open, Figure 8(2) is a perspective view with the opening open, Figure 9(1) is a plan view with the opening closed after the reinforcing bars have been attached, and Figure 9(2) is a plan view with the opening open in the reverse direction. When attaching reinforcing bars to the rebar jig 1, the hook member 2 is lifted upward as shown in Figure 7(1). The retaining member 3 is slidable vertically between the lower end of the screw head 4a and the upper end of the hook portion 2. Therefore, when the hook member 2 is lifted upward, the engagement between the protrusion 3d, which is the first engaging portion, and the outer surface of the screw head 4a, which is used as the second engaging portion, is released, and the locking mechanism ceases to function. With the lock released, the retaining member 3 can be rotated horizontally as shown by the arrows in Figure 7(1) or (2), allowing the opening 25 to be opened. Because the retaining member 3 is structured to rotate on a substantially horizontal plane rather than vertically, even if the reinforcing bar being held is unexpectedly lifted while the retaining portion 3a is closed, the retaining member 3 will not move vertically beyond the contact portion with the screw head 4a, thus preventing the reinforcing bar from falling. In this embodiment, the example of rotating the retaining portion 3a towards the front will be described in detail.

[0027] When the lock is released and the retaining part 3a is rotated towards the front, the opening 25 is opened, and the reinforcing bar 7 can be easily attached to the holding part 2a of the hook member 2, as shown in Figure 8(1) or (2). As shown in Figure 8(1), the width W1 of the hook member 2 and the width W2 of the retaining member 3 are approximately the same, so even when rotated by approximately 90° in a plan view, the structure is such that the retaining member 3 does not interfere with the reinforcing bar 7 when attaching or removing it.

[0028] After attaching the reinforcing bar 7 to the holding portion 2a of the hook member 2, the retaining portion 3a is rotated inward to close the opening 25 as shown in Figure 9(1). Since the reinforcing bar jig 1 is locked to the locking member 60 by the weight of the retaining member 3, when the opening 25 is closed with the reinforcing bar 7 attached to the holding portion 2a of the hook member 2, the hexagonal bolt 4 and the hook portion 2 are firmly locked by the retaining member 3 due to the added weight of the reinforcing bar 7 (see Figure 11(1)). The structure of the locking mechanism is as described above. In this way, by attaching the reinforcing bar 7 to the hook member 2, the rotation of the anti-detachment member 3 can be more firmly prevented than before attachment, and the reinforcing bar can be effectively prevented from falling.

[0029] Here, we will explain the reinforcement bar installation work using the reinforcement jig 1 of this embodiment. Figures 10-1 and 10-2 are diagrams illustrating the attachment of reinforcing bars to rebar support fixtures. (1) shows the attachment of the second row from the top, (2) shows the attachment of the third row from the top, (3) shows the attachment of the fourth row from the top, and (4) shows the attachment of the fifth row from the top. As shown in Figure 10-1 or Figure 10-2, the rebar support 10 has wires (6a, 6b) suspended from the suspension beam 8, with rebar jigs (1a, 1c, 1e, 1g, 1i) attached to wire 6a and rebar jigs (1b, 1d, 1f, 1h, 1j) attached to wire 6b at predetermined intervals. Wire 6a and rebar jigs (1a, 1c, 1e, 1g, 1i), or wire 6b and rebar jigs (1b, 1d, 1f, 1h, 1j), respectively, correspond to wires with rebar jigs. For the sake of explanation, the locking members 60 are not shown here, but locking members 60 corresponding to the number of rebar jigs 1 are provided on the wires (6a, 6b). By connecting the rebar placement jigs (1a-1j) to the wires (6a, 6b) at predetermined intervals, accurate assembly during rebar placement work becomes possible, improving construction quality. Furthermore, the need for rebar spacing is eliminated, shortening the construction process. The predetermined intervals are designed according to the type of rebar being held and the construction target.

[0030] When attaching reinforcing bars 7 to the rebar placement lifting device 10, the lifting beam 8 is lifted to a height that is easy for the workers (9a, 9b) to work with using a crane (not shown). The workers (9a, 9b) take one reinforcing bar 7 from the bundle of reinforcing bars 7 and attach it to the rebar placement jig 1. Once the attachment is complete, the lifting beam 8 is lifted further and the next reinforcing bar 7 is attached. In the example shown in Figure 10-1(1), the reinforcing bars 7a have already been attached to the reinforcing jig (1a, 1b), and the lifting beam 8 has been lifted by a crane to a height that is easy for the workers (9a, 9b) to work at. In this state, worker 9a attaches the reinforcing bars 7b to the reinforcing jig 1c, and worker 9b attaches the reinforcing bars 7b to the reinforcing jig 1d. Subsequently, the lifting beam 8 is further lifted, and as shown in Figure 10-1(2), worker 9a attaches the reinforcing bars 7c to the reinforcing jig 1e, and worker 9b attaches the reinforcing bars 7c to the reinforcing jig 1f. Similarly, the lifting beam 8 is lifted, and as shown in Figure 10-2(3), worker 9a attaches the reinforcing bars 7d to the reinforcing jig 1g, and worker 9b attaches the reinforcing bars 7d to the reinforcing jig 1h. The lifting beam 8 is further lifted, and as shown in Figure 10-2(4), worker 9a attaches the reinforcing bars 7e to the reinforcing jig 1i, and worker 9b attaches the reinforcing bars 7e to the reinforcing jig 1j.

[0031] In this way, by gradually lifting the rebar lifting device 10 and attaching the rebars 7 to the rebar jig 1, the amount of work on the scaffolding can be reduced, and construction can be carried out safely by eliminating the need to work in awkward positions. In addition, since the amount of lifting work is reduced, the physical burden is lessened, which has the advantage of allowing work to be done with fewer personnel and thus reducing costs. The rebar support 10 has two wires with rebar support jigs suspended from the support beam 8, but depending on the length and weight of the reinforcing bars 7 to be held, three or more wires with rebar support jigs may be suspended. Also, the support beam 8 is not limited to a straight shape, but may also be curved. By changing the shape of the support beam used, it is possible to accommodate bent objects as well. In this way, by changing the configuration, it can be adapted to various construction environments and can be used in a wide range of applications. In addition, because wires 6 are used, it has the advantage of being easy to carry.

[0032] Furthermore, the rebar placement jig 1 has the advantage that the suspended load does not easily fall because it has a rotating stopper. Figures 11 and 12 are functional diagrams of the rebar placement jig of Embodiment 1, with Figure 11(1) showing the front view of the rebar placement jig after the rebar has been installed, Figure 11(2) showing the front view of the rebar placement jig when the rebar has been removed, Figure 12(1) showing the front view of rebar placement jig when the rebar and hook member have been removed. As mentioned above, the rebar jig 1 utilizes the gravity of each component to activate the locking mechanism. Therefore, as shown in Figure 11(1), the locking mechanism of the hexagonal bolt 4 and the retaining member 3 functions more securely after the rebar 7 is installed than before the rebar 7 is installed (see Figure 6(1)). To remove the rebar 7, as shown in Figure 11(2), slowly lift the hook member 2 to disengage the protrusion 3d from the screw head 4a, and then rotate the retaining member 3a horizontally to open the opening 25.

[0033] In contrast, for example, as shown in Figure 12(1), if the reinforcing bar 7 lifts up unintentionally, the first step is that the reinforcing bar 7 will not fall out as long as the locking mechanism between the hexagonal bolt 4 and the retaining member 3 is functioning. Also, if the hook member 2 lifts up at the same time as the reinforcing bar 7, the locking mechanism between the hexagonal bolt 4 and the retaining member 3 may be temporarily released. However, the second step is that the reinforcing bar 7 will collide with the retaining member 3 at that time, causing the retaining member 3 to come into contact with the hexagonal bolt 4, resulting in a lock. Even if the retaining member 3 does not come into contact with the hexagonal bolt 4 and the lock does not engage, the third step is that the retaining member 3 does not move up or down beyond its sliding range, so it will not open upwards like the retaining part in Patent Document 3. Therefore, if the safety mechanisms from the first to the third stage fail to function, specifically if the hook member 2 lifts up simultaneously with the reinforcing bar 7, the locking mechanism fails to engage when the reinforcing bar 7 collides with the retaining member 3, and the retaining member 3 rotates horizontally to nearly 90°, then there is a risk of the reinforcing bar 7 falling. In this way, by providing safety mechanisms that ensure safety in stages, it can be used as an extremely safe jig. [Examples]

[0034] Figure 13 shows an external perspective view of the rebar placement jig of Embodiment 2. Figure 14 shows a front view of the rebar placement jig of Embodiment 2. As shown in Figure 14, the rebar placement jig 11 of Embodiment 2 is a jig that holds reinforcing bars (not shown) by inserting a wire 6 into a wire hole 31c and locking it with a locking member 60 provided on the wire 6. It consists of a hook member 21, a retaining member 31, and a cap member 41, all of which are made of metal.

[0035] As shown in Figure 13, unlike the hook member 2 of Embodiment 1, the hook member 21 is formed by bending a cylindrical metal member, and as shown in Figure 14, it is provided with a holding portion 2a, with the base end 23a being longer than the tip end 24a. It can be manufactured at low cost by processing a cylindrical metal member. Furthermore, a locking portion 21c is provided on the base end 23a side of the hook member 21. The fixing portion of the hook member 21 is a second male screw portion 21b provided on the base end 23a side of the hook member 21.

[0036] The retaining member 31 has a retaining portion 31a that opens and closes the opening 25a of the hook member 21, a through hole 31b into which the base end 23a of the hook member 21 is fitted, a wire hole 31c, and a protrusion 31d. The retaining portion 31a and the wire hole 31c are provided in opposing positions via the through hole 31b. The protrusion 31d is provided as a first engaging portion and has a shape that engages with the recess 41d.

[0037] The cap member 41 is used as a fastener and is provided with a female screw portion 41b as a second female screw portion. The recess 41d is provided as a second engaging portion and is located on the outer circumferential surface of the cap member 41. The recess 41d is provided on the cap member 41 side for ease of processing; for example, a protrusion could be provided on the cap member 41 to serve as the second engaging portion, and the first engaging portion provided on the retaining member 31 could be the recess. As shown in Figure 14, the base end 23a of the hook member 21 is inserted into the through hole 31b from below, and the second male threaded portion 21b and the second female threaded portion 41b are screwed together and fixed. With this configuration, the retaining member 31 can be fixed using the shape of the hook member 21 without using a hexagonal bolt 4. In other words, the retaining member 31 slides up and down on the hook member 21, rather than on the cylindrical portion 4b of the hexagonal bolt 4. Furthermore, the locking portion 21c is provided to limit the vertical sliding range of the retaining member 31, preventing the hook member 21 from rising too high during use, especially when opening the opening 25a. In addition, the retaining member 31 is rotatable around the axis of the inserted hook member 21. The other components are the same as those of the reinforcement jig 1 in Example 1.

[0038] Figure 15 shows an image illustrating the use of the reinforcement jig in Example 2. As shown in Figure 15, the reinforcement lifting device 10a has three wires 6 suspended from one lifting beam 8, and four reinforcement jigs 11 are attached to each wire 6 at predetermined intervals. In this way, the horizontal reinforcements can be connected in a curtain-like manner at predetermined intervals, and these can be lifted all at once and guided to the reinforcement position for reinforcement work. The number of wires 6 suspended from one lifting beam 8, the number of reinforcement jigs 11 attached to the wires 6, and the spacing between the reinforcement jigs 11 can be appropriately designed according to the type of reinforcement to be held and the construction target. [Examples]

[0039] Figure 16 shows a front view of the reinforcement jig of Example 3. Figure 17 is an explanatory diagram for attaching reinforcing bars to the reinforcement jig of Example 3, where (1) is a front view, (2) is a plan view with the opening closed, and (3) is a plan view with the opening open. As shown in Figure 16, the reinforcement jig 12 of Embodiment 3 is a jig that holds the reinforcing bar 7 by inserting the wire 6 into the wire hole 32c and locking it with the locking member 60 provided on the wire 6, and consists of a hook member 22, a retaining member 32 and a screw member 42, all of which are made of metal.

[0040] As shown in Figure 16, the hook member 22 is formed by bending a cylindrical metal member, but unlike the hook member 21 of Embodiment 2, it is provided with a locking portion 22c having a female screw portion 22b inside. The female screw portion 22b functions as the first female screw portion. By providing the female screw portion 22b in the locking portion 22c, the processing of the hook member 22 becomes easier.

[0041] The retaining member 32 has a retaining portion 32a that opens and closes the opening 25b of the hook member 22, a through hole 32b into which the cylindrical portion 42b of the screw member 42 is fitted, a wire hole 32c, and a protrusion 32d. The retaining portion 32a and the wire hole 32c are provided in opposing positions via the through hole 32b. The protrusion 32d is provided as a first engaging portion and has a shape that engages with the recess 42d. In Example 1, the retaining part 3a is provided with a length that covers the tip portion 24, and in Example 2, the retaining part 31a is also provided with a length that covers the tip portion 24a. However, the length L2 of the retaining part 32a in Example 3 is not the length L1 that covers the tip portion 24b, but is set to a length L2 that leaves a gap 26 (see Figures 17(1), (2)) between it and the tip portion 24b even when closed. This is because the function of the retaining part 32a is that it is sufficient to cover the opening 25b to the extent that it can prevent the reinforcing bar 7, which is the object to be held, from falling. Therefore, even if the retaining part 32a slides up and down, the length of the retaining part 32a may be shortened to the extent that a gap 26 exceeding the outer diameter φ of the reinforcing bar 7 being held does not occur, for example, it may be the length L3 shown in Figure 16. By shortening the length of the retaining part 32a, the jig can be made lighter and less expensive. Furthermore, by shortening the length of the retaining portion 32a, it is possible to prevent accidents such as a worker's fingers getting caught between the retaining portion 32a and the tip portion 24b during the installation and removal of the reinforcing bar 7, thereby improving safety.

[0042] The screw member 42 is used as a fastener and is provided with a screw head 42a, a cylindrical portion 42b, and a male screw portion 42c as a first male screw portion. The recess 42d is provided on the outer circumferential surface of the screw head 42a as a second engaging portion. As shown in Figure 16, the screw member 42 is inserted into the through hole 32b from above, and the first male screw portion, the male screw portion 42c, and the first female screw portion, the female screw portion 22b, are screwed together and fixed in place.

[0043] In this embodiment, as shown in Figure 17(2), the width of the portion surrounding the wire hole 32c in the retaining member 32 is made larger than the width of the retaining portion 32a, allowing a large-diameter wire 6 to be inserted. Therefore, it is necessary to prevent the large-diameter wire 6 or the portion constituting the wire hole 32c from interfering with the object to be held when the retaining member 32 is rotated. Therefore, in Embodiment 2, the retaining member 31 has a structure in which it rotates around the hook member 21, whereas in Embodiment 3, the screw member 42 has a structure in which it screws into the locking portion 22c, and the position of the axis on which the retaining member 32 rotates is set to the right of the rebar jig 11 in Embodiment 2 when viewed from the front. As a result, when the retaining portion 32a is rotated horizontally from the closed state shown in Figure 17(2) to open the opening 25b as shown in Figure 17(3), the retaining member 32 rotates at a position further from the holding portion 22a than the rebar jig 11 in Embodiment 2, so that the part constituting the wire hole 32c does not interfere with the rebar 7 which is the object to be held, and the rebar 7 can be attached and detached smoothly. The other components are the same as those of the reinforcement jig 11 in Example 2. [Industrial applicability]

[0044] This invention is useful for lifting devices used in reinforcement work, such as for horizontal reinforcement in the walls of structures or hoop reinforcement in deep foundation piles. [Explanation of Symbols]

[0045] 1,1a~1j,11,12 Reinforcement bar jigs 2,21,22 Hook members 2a,21a,22a Holding part 2b, 22b, 41b Female thread section 2c,4d pin hole 3,31,32 Anti-detachment member 3a, 31a, 32a Anti-detachment parts 3b,31b,32b through hole 3c, 31c, 32c wire holes 3d, 31d, 32d convex parts 4 Hex bolts 4a, 42a Screw head 4b, 42b Cylindrical section 4c, 21b, 42c Male thread section 5 Fixing pins 5a,5b end 6,6a~6c wire 7,7a~7e Rebar 8 suspension beams 9a,9b worker 10,10a Lifting equipment for reinforcement 21c,22c Locking part 23,23a Proximal end 24,24a,24b Tip 25,25a,25b opening 26 Gap 41 Cap member 41d, 42d recess 42 Screw component 60 Locking member H1, H2 height L1~L3 Length T1, T2 thickness W1, W2 width φ Outer diameter

Claims

1. A rebar placement jig that inserts a wire into a wire hole, locks the wire in place, and holds the reinforcing bar in place, A hook member having an overall U-shape or U-shape with a curved or bent bottom and a holding part for holding reinforcing bars, The aforementioned hook member has a retaining part that opens and closes the opening and a retaining member having a through hole, A fastener is provided on the base end side of the hook member, which is passed through the through hole of the retaining member to secure the upper end. Equipped with, A rebar aligning jig characterized in that, when the opening at the top of the hook member is positioned upwards and the bottom is positioned downwards, the retaining member rotates or slides on a substantially horizontal plane relative to the hook member, thereby opening and closing the opening.

2. The hook member has a fixing portion on its base end for fixing a fastener, The retaining member has a through hole into which the fastener or the hook member is fitted, is slidable between a part of the fastener and a part of the hook member in the axial direction of the fastener, and is rotatable around the axis of the fastener. The reinforcement bar jig according to feature 1.

3. The aforementioned retaining member is provided with a first engaging portion, The fastener is provided with a second engaging portion, The rebar jig according to claim 2, characterized in that when the retaining member comes into contact with a part of the fastener, the first engaging portion and the second engaging portion engage, preventing the rotation of the retaining member and maintaining the closed state of the hook member.

4. The rebar placement jig according to claim 3, characterized in that the wire hole is provided in the retaining member.

5. A part of the hook member is the base end of the hook member, The fixing portion is a first female screw portion provided at the base end, The fastener is a hexagonal bolt consisting of a screw head, a cylindrical portion, and a first male screw portion. The hexagonal bolt is inserted through the through hole from above, and the first male threaded portion and the first female threaded portion are screwed together and fixed in place. The reinforcement jig according to claim 4, characterized in that a part of the fastener is the lower end of the screw head.

6. The second engaging portion is a part of the shape of the outer surface of the screw head, The reinforcement jig according to claim 5, characterized in that the first engaging portion has a shape that engages with a part of the shape.

7. The hexagonal bolt and the pin for fixing the hook portion are further provided. The hook portion is provided with a first pin hole that passes through the first female screw portion. The hexagonal bolt is provided with a second pin hole that passes through the first male threaded portion. The reinforcement jig according to claim 6, characterized in that the pin is inserted with the first pin hole and the second pin hole in a substantially straight line, and both ends of the pin are crimped and fixed.

8. A part of the hook member is a locking portion provided on the base end side of the hook member, The fixing portion is a second male screw portion provided at the base end of the hook member, The fastener is a cap member having a second female screw portion formed therein. The base end of the hook member is inserted into the through hole from below, and the second male threaded portion and the second female threaded portion are screwed together and fixed in place. The reinforcement jig according to claim 4, characterized in that a part of the fastener is the lower end of the cap member.

9. The second engaging portion is a recess provided on the outer circumferential surface of the cap member. The reinforcement jig according to claim 8, characterized in that the first engaging portion is a convex portion shaped to engage with the recess.

10. A wire with rebar jigs, wherein multiple rebar jigs according to any of claims 1 to 9 are attached at predetermined intervals and locked together by locking members.

11. A rebar support device in which multiple wires with rebar support jigs according to claim 10 are suspended from a suspension beam.

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