Reinforcement arrangement device, reinforcement arrangement method, and reinforcement support cradle

Abstract

To provide a reinforcement arrangement device and a reinforcement arrangement method that can easily arrange distribution reinforcements that intersect a plurality of main reinforcements when arranging reinforcements in a reinforced concrete structure.SOLUTION: A reinforcement arrangement device 100 for arranging distribution reinforcements 2 that intersect a plurality of main reinforcements 3 in reinforcement arrangement in a reinforced concrete structure and comprises: a long member 12 arranged in parallel along the main reinforcements 3, a spacer member 70 arranged movably along the long member 12; and a support portion 72 provided in the spacer member 70 and supporting the distribution reinforcements 2. A length dimension of the spacer member 70 along the long member 12 corresponds to a spacing of the distribution reinforcements 2 along the main reinforcements 3. The spacer member 70 is configured to move along the long member 12 in accordance with operation of a drive portion 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a reinforcing bar arrangement device, a reinforcing bar arrangement method, and a reinforcing bar support stand. [Background technology]

[0002] Patent Document 1 describes a method for efficiently arranging reinforcement for underground beams, including stirrup bars, without installing special scaffolding, by using a top-bottom separate rack for arranging reinforcement for underground beams, which is embedded into concrete together with rebar and allows easy adjustment of the height of the upper part, in construction work for installing underground beams made of reinforced concrete. The rack also describes the rack used in this method. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5931819 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in the case of the arrangement of reinforcement bars in large-scale reinforced concrete structures, the size of the rebars is large, and manual transportation places a heavy burden on the workers, so a rack may be used for the arrangement of the reinforcement bars, as in the above-mentioned conventional technology. However, with a general rack, for example, the work of assembling the rack itself and the work of adjusting the rack height to lay the rebars can be cumbersome.

[0005] The present invention aims to provide a reinforcing bar arrangement device, a reinforcing bar arrangement method, and a reinforcing bar support stand that can easily arrange reinforcement bars that intersect multiple main reinforcements in the reinforcement of reinforced concrete structures. [Means for solving the problem]

[0006] One aspect of the present invention is a rebar placement device for placing distribution bars that intersect a plurality of main bars in the reinforcement of a reinforced concrete structure, the device comprising: a long member arranged in parallel along the main bars; a spacer member arranged movably along the long member; and a support portion arranged on the spacer member and supporting the distribution bars, the length dimension of the spacer member along the long member corresponding to the spacing of the distribution bars along the main bars, and the spacer member configured to move along the long member in accordance with the operation of a drive portion.

[0007] In the reinforcing bar arrangement device according to one aspect of the present invention, long members are arranged in parallel along the main bars. The spacer members are configured to move along the long members in accordance with the operation of the drive unit. The spacer members move by the operation of the drive unit while the reinforcing bars are supported by the support units. Here, since the length dimension of the spacer members along the long members corresponds to the predetermined reinforcing bar spacing along the main bars, for example, when multiple spacer members are arranged along one long member, the spacing between the reinforcing bars supported by each support unit of the multiple spacer members matches the predetermined reinforcing bar spacing. Therefore, according to the reinforcing bar arrangement device according to one aspect of the present invention, reinforcing bars that cross multiple main bars can be easily arranged in the reinforcement of a reinforced concrete structure.

[0008] In one embodiment, the main reinforcements extend in the vertical direction, and a plurality of long members are installed in the arrangement range of the reinforcing bars, and in each of the plurality of long members, the spacer members with the reinforcing bars supported by the support parts are stacked in sequence from the lower end side of the long member. In this case, in each of the plurality of long members installed in the arrangement range of the reinforcing bars, the spacer members with the reinforcing bars supported by the support parts are stacked in sequence from the lower end side of the long member. The plurality of spacer members stacked in this manner function as a stand for erecting the reinforcing bars in multiple stages. This eliminates the need for assembling the stand and adjusting the height of the stand for laying the reinforcing bars.

[0009] In one embodiment, the spacer member is a tubular member having an engagement portion on its side that engages with the lifting portion of a lifting device that is raised and lowered by a drive portion, and is raised and lowered while suspended from the lifting portion via the engagement portion, and the engagement portion may maintain the connection with the lifting portion by applying the weight of the spacer member to the lifting portion, and release the connection with the lifting portion by not applying the weight of the spacer member to the lifting portion. In this case, for example, when the spacer member is suspended, the weight of the spacer member acts on the lifting portion via the engagement portion, and the suspended state is maintained. On the other hand, in the case of the spacer members stacked in sequence, the weight of the spacer member that acted on the lifting portion no longer acts on the lifting portion, and the connection of the engagement portion between the lifting portion and the spacer member is automatically released. In this way, the engagement between the spacer member that has finished transporting the reinforcing bars and the engagement portion can be automatically released.

[0010] Another aspect of the present invention is a rebar placement method for placing distribution bars that intersect a plurality of main bars in the reinforcement of a reinforced concrete structure, the method comprising: long members arranged in parallel along the main bars; spacer members arranged movably along the long members; and support parts arranged on the spacer members and supporting the distribution bars, the length dimension of the spacer members along the long members corresponding to the reinforcing interval of the distribution bars along the main bars, and the spacer members being configured to move along the long members in accordance with the operation of a drive unit. The method comprises: an installation step of installing the long members using a rebar placement device; a support step of supporting the distribution bars on the support parts of the long members; and a movement step of moving the spacer members with the distribution bars supported by the support parts of the long members along the long members in accordance with the operation of the drive unit.

[0011] In a reinforcing bar arrangement method according to another aspect of the present invention, a long member is placed along the main reinforcement, and a reinforcing bar is supported by a support part of a spacer member configured to move along the long member according to the operation of a drive part. In the long member, the reinforcing bar is supported by the support part, and the spacer member is moved by the operation of the drive part. Here, since the length dimension of the spacer member along the long member corresponds to the predetermined reinforcing bar spacing along the main reinforcement, when multiple spacer members are lined up along one long member, for example, the spacing between the reinforcing bars supported by each support part of the multiple spacer members matches the predetermined reinforcing bar spacing. Therefore, according to the reinforcing bar arrangement method according to another aspect of the present invention, reinforcing bars that cross multiple main reinforcement bars can be easily arranged in the reinforcement of a reinforced concrete structure.

[0012] In one embodiment, the multiple main reinforcements extend in the vertical direction, and in the installation step, multiple long members are installed in the arrangement range of the reinforcing bars, and in the support step, the support parts of each of the multiple long members support the reinforcing bars, and in the moving step, the spacer members with the reinforcing bars supported by the support parts of each of the multiple long members may be lowered along the long members according to the operation of the drive unit and stacked sequentially from the lower end side of the long members. In this case, in each of the multiple long members installed in the arrangement range of the reinforcing bars, the spacer members with the reinforcing bars supported by the support parts are stacked sequentially from the lower end side of the long members. The multiple spacer members stacked in this way function as a stand for erecting the reinforcing bars in multiple stages. This makes it possible to omit the work of assembling the stand and the work of adjusting the stand height for laying the reinforcing bars.

[0013] Yet another aspect of the present invention is a reinforcing bar support stand for placing distribution bars that cross a plurality of main bars in the reinforcement of a reinforced concrete structure, comprising long members arranged in parallel along the main bars, spacer members arranged movably along the long members, and support parts arranged on the spacer members and supporting the distribution bars, the length dimension of the spacer members along the long members corresponding to the spacing of the distribution bars along the main bars.

[0014] In the reinforcing bar support frame according to yet another aspect of the present invention, the long members are arranged in parallel along the main reinforcement. For example, spacer members that can move along the long members are sequentially arranged along one long member. Reinforcement bars are arranged at each support part of the stacked spacer members, and the multiple reinforcing bars are arranged at the positions of the support parts. Here, since the length dimension of the spacer members along the long member corresponds to the predetermined reinforcing bar spacing along the main reinforcement, the spacing between the reinforcing bars supported by each support part of the multiple spacer members matches the predetermined reinforcing bar spacing. In other words, the multiple spacer members are moved along the long member and stacked sequentially, thereby supporting the multiple reinforcing bars along the long member and defining the reinforcing bar spacing. Therefore, according to the reinforcing bar support frame according to yet another aspect of the present invention, reinforcing bars that cross multiple main reinforcement bars can be easily arranged in the reinforcement of a reinforced concrete structure. Effect of the Invention

[0015] According to the present invention, it is possible to easily arrange distribution bars that intersect multiple main bars in the reinforcement of a reinforced concrete structure. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a side view showing an example of use of the reinforcing bar arrangement device according to the embodiment. [Diagram 2] 1A is a plan view illustrating an example of the structure of the upper fixing part, and FIG. 1B is a plan view illustrating an example of fixing an elongated member by the upper fixing part. [Diagram 3] 11 is a plan view illustrating the structure of a lower fixed part. FIG. [Figure 4] 13 is a plan view showing the relationship between the lifting section and a spacer member. FIG. [Diagram 5] 13 is a side view showing an example of releasing the connection of the engagement portion. FIG. [Figure 6] 1A is a schematic plan view showing a first arrangement example of a plurality of elongated members, FIG. 1B is a schematic plan view showing a second arrangement example of a plurality of elongated members, and FIG. 1C is a schematic plan view showing a third arrangement example of a plurality of elongated members. [Figure 7] 1 is a flowchart showing an example of a rebar arrangement method. [Figure 8] 13(a) to 13(c) are side views showing examples of use of a reinforcing bar arrangement device according to a modified example. [Figure 9] 9 is a side view showing an example of the internal structure of the spacer member of FIG. 8. FIG. [Figure 10] 9(a) to 9(c) are side views showing a continuation of the usage example of FIG. [Figure 11] 11(a) to 11(c) are side views showing a continuation of the usage example of FIG. [Figure 12] 1A is a side view showing an example of use of the reinforcing bar support rack according to the embodiment, and FIG. 1B is a side view showing an example of use of the reinforcing bar support rack according to a modified example. [Figure 13] 13A is a side view showing a spacer member according to a modified example, and FIG. 13B is a front view showing a spacer member according to a modified example. [Figure 14] 13 is a plan view showing the relationship between a long member and a spacer member according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated description will be omitted.

[0018] FIG. 1 is a side view showing an example of use of a reinforcing bar arrangement device according to an embodiment. The reinforcing bar arrangement device 100 is a jig for arranging reinforcing bars that intersect multiple main bars in the arrangement of reinforced concrete structures. The reinforcing bar arrangement device 100 can be used together with, for example, a transport device (lifting device) 1. The transport device 1 is a device for transporting an object to be transported along a predetermined transport direction. The arrangement of reinforcement in a reinforced concrete structure means, for example, reinforcing bars for constructing walls and columns of a skeleton having multiple main bars extending in the vertical direction and reinforcing bars intersecting the main bars. Reinforcing bars are reinforcing bars arranged to extend in a lateral direction (for example, horizontal direction) that intersects the vertical direction. The extension directions of the main bars and reinforcing bars may be inclined from the vertical direction and the horizontal direction.

[0019] For example, when the reinforced concrete structure is a large-scale structure such as a nuclear power structure, the reinforcing bars are heavy and have a large diameter (e.g., D51, etc.), and it is a great burden for workers to hold and place them manually. Therefore, the reinforcing bar placement device 100 is used to place reinforcement bars in a reinforced concrete structure by supporting the reinforcing bars 2 on the support parts 72 of the reinforcing bar placement device 100 at the top of a previously assembled scaffolding, and repeatedly transporting the reinforcing bars 2 downward to a predetermined height.

[0020] [Configuration of the transport device and rebar placement device] The transport device 1 comprises a screw-jointed reinforcing bar 10, a drive unit 20, a long member 12, an upper fixed unit 40, a lower fixed unit 50, an advance / retreat member (lifting unit) 60, a hoisting shackle (lifting unit) 61, and a spacer member 70. The reinforcing bar arrangement device 100 comprises the long members 12 arranged in parallel along the main reinforcement bars 3, the spacer member 70 arranged movably along the long members 12, and a support unit 72 arranged on the spacer member 70 and supporting the reinforcing bars 2.

[0021] The threaded rebar 10 is a long rod-like rebar with a screw thread (screw-shaped joint) formed on the outer circumferential surface 11. The threaded rebar 10 is generally used as a rebar that can connect other threaded rebars 10 via a mechanical joint. The threaded rebar 10 here utilizes the screw thread on the outer circumferential surface 11 to convert the driving force of the drive source 21 into the conveying force of the conveying device 1, and is used as a rail that moves the advancing and retracting member 60 forward and backward. Each threaded rebar 10 can be up to 12 m long, and the length is determined according to the arrangement position of the reinforcing bars 2.

[0022] As an example, the threaded rebar 10 is arranged so as to extend linearly in the vertical direction. The vertical direction is the direction in which the multiple main reinforcements 3 extend, for example along the vertical direction, which corresponds to the conveying direction of the conveying device 1 here. The threaded rebar 10 is supported rotatably around an axis at both upper and lower ends along the conveying direction of the conveying device 1. In the conveying device 1 here, the threaded rebar 10 is arranged so as to extend along the main reinforcements of the reinforced concrete structure.

[0023] The lower end of the threaded rebar 10 is rotatably supported by a driving unit 20, and receives a rotating driving force. The driving unit 20 serves as the base of the conveying device 1, and is a part that generates the driving force for conveying. The driving unit 20 has a driving source 21, a transmission unit 22, and a housing 23.

[0024] The driving source 21 is a component that generates a driving force for moving the spacer member 70, and for example, a commercially available rechargeable electric drill or electric impact driver can be used.

[0025] The transmission unit 22 is a part that transmits the driving force of the driving source 21 to the threaded rebar 10. The transmission unit 22 includes, for example, a gear box 22a, an output shaft 22b, a coupling 22c, a vertical shaft 22d, a rebar connection part 22e, an angular bearing 22f, and a thrust bearing 22g.

[0026] The gear box 22a receives the driving force of the driving source 21 and changes the direction of rotation of the driving source 21 to the axis of the threaded rebar 10. A gear box of a known configuration can be used as the gear box 22a. The gear box 22a outputs the driving force, whose direction of rotation has been changed, to the output shaft 22b of the gear box 22a, which is coaxial with the axis of the threaded rebar 10.

[0027] The coupling 22c is a power transmission member that connects the output shaft 22b and the vertical shaft 22d. A known type of coupling (e.g., a flex coupling) can be used as the coupling 22c. The vertical shaft 22d is an intermediate shaft between the output shaft 22b and the threaded reinforcing bar 10. For example, one end of the vertical shaft 22d is connected to the coupling 22c as a lower end, and the other end is connected to the threaded reinforcing bar 10 as an upper end using the reinforcing bar connection part 22e.

[0028] The reinforcing bar connection portion 22e is not particularly limited, but may be a reinforcing bar nut that can be screwed onto the threaded reinforcing bar 10. The lower end of the threaded reinforcing bar 10 is inserted above the reinforcing bar connection portion 22e.

[0029] The angular bearing 22f is a bearing for supporting the threaded rebar 10 rotatably about its axis while positioning the threaded rebar 10 in the radial direction. The thrust bearing 22g supports the vertical load in the axial direction of the threaded rebar 10. A C-ring that can be tightened with a bolt may be provided below the angular bearing 22f to prevent the vertical shaft 22d from coming off upward (not shown).

[0030] The housing 23 is a member that supports the vertical load in the axial direction from the threaded reinforcing bar 10 and also serves as a housing for the drive unit 20. The housing 23 has, for example, a lower housing 24 and an upper housing 25. The dimensions and shape of each part of the housing 23 are determined so that deformation, etc. does not occur due to the vertical load in the axial direction from the threaded reinforcing bar 10.

[0031] The lower housing 24 is a gear house that houses the gear box 22a and the output shaft 22b. The lower housing 24 is a part that serves as the main foundation of the entire conveying device 1. The lower housing 24 is, for example, a box-shaped body formed of two or more side walls and a top plate and a bottom plate arranged above and below the side walls to define an internal storage space. The side walls of the lower housing 24 may be arranged, for example, to face each other, and the storage space sandwiched between the pair of side walls may be open in the lateral direction. The lower housing 24 may be formed by welding iron plates together. The lower surface 24a, which is the bottom plate of the lower housing 24, is placed on a concrete surface 4 in which a plurality of main reinforcements 3 extending in the vertical direction are embedded.

[0032] The upper housing 25 is a gear house that houses or supports the coupling 22c, the vertical shaft 22d, the angular bearing 22f, and the thrust bearing 22g. The upper housing 25 rotatably supports the lower end side of the threaded reinforcing bar 10. The upper housing 25 is, for example, a box-shaped body formed of two or more side walls having dimensions smaller than those of the lower housing 24 and a top plate and a bottom plate arranged above and below the side walls so as to define an accommodation space inside. The side walls of the upper housing 25 may be arranged, for example, in parallel positions with the side walls of the lower housing 24 so as to face each other, and the accommodation space sandwiched between the pair of side walls may be opened in the lateral direction. The upper housing 25 has an upper bottom portion 25a which is an upper top plate, and a through hole (not shown) through which the vertical shaft 22d is inserted is formed. The lower end of the upper housing 25 is fixed to the upper surface 24b of the lower housing 24 so as to also serve as the bottom plate of the upper housing 25.

[0033] The long member 12 is a member for guiding the spacer member 70 that supports the reinforcing bars 2. The long members 12 are arranged in parallel along the main bars 3. The long members 12 may extend linearly in the vertical direction along the threaded reinforcing bars 10. The long members 12 may be, for example, bars, square bars, or pipes, and are round steel materials in this example. The long members 12 may have a thickness that takes into account the load applied from the spacer member 70 according to the dimensions and number of the reinforcing bars 2. The length of the long members 12 corresponds to the arrangement position of the reinforcing bars 2. In the example of FIG. 1, the long members 12 have a height that is approximately the same as that of the threaded reinforcing bars 10.

[0034] The upper end of the threaded reinforcing bar 10 and the upper end of the long member 12 are connected by the upper fixing part 40. The upper fixing part 40 is a structure for fixing the upper end of the long member 12 to the upper end of the threaded reinforcing bar 10. FIG. 2(a) is a plan view illustrating the structure of the upper fixing part. As shown in FIG. 1 and FIG. 2(a), on the threaded reinforcing bar 10 side of the upper fixing part 40, the threaded reinforcing bar 10 is inserted into a flanged cylindrical member 41, and the flanged cylindrical member 41 is inserted into the rotation support part 42 of the upper fixing part 40 through a predetermined clearance D, so that the threaded reinforcing bar 10 is rotatably supported. The upper and lower ends of the flanged cylindrical member 41 are fixed so as to be sandwiched between a pair of lock nuts 43. Therefore, inside the rotation support part 42, the pair of lock nuts 43 and the flanged cylindrical member 41 rotate together with the threaded reinforcing bar 10.

[0035] On the side of the elongated member 12 of the upper fixing part 40, a pair of plate-like members 44 are arranged to sandwich the elongated member 12. The pair of plate-like members 44 extend parallel to each other with the rotation support part 42 as a base end, and a reinforcing plate 45 is provided at the joint with the rotation support part 42. The lower sides of the pair of plate-like members 44 are placed on the upper surface of the flat part of the reinforcing plate 45 and fixed by, for example, welding.

[0036] As shown in FIG. 2(a), when the threaded reinforcing bar 10 is inserted through the rotation support part 42, the pair of plate-like members 44 are in a positional relationship in which they sandwich the long member 12 and are sandwiched between the pair of main reinforcements 3. A flat plate 44a protruding in the tangential direction of the pair of main reinforcements 3 is provided at the center of the pair of plate-like members 44. The flat plate 44a is, for example, a steel plate, and is fixed to each of the pair of plate-like members 44 by, for example, welding. The upper fixing part 40 is fixed to the main reinforcements 3 by fixing each of the pair of main reinforcements 3 and the flat plate 44a with, for example, a U-bolt, thereby suppressing the displacement along the horizontal plane. The main reinforcements 3 are indicated by dashed lines in FIG. 1. In the state of FIG. 2(a), the spacer member 70 inserted through the long member 12 can be lowered to pass between the pair of plate-like members 44 in order to connect the spacer member 70 described later to the advancing and retreating member 60 below the upper fixing part 40.

[0037] FIG. 2(b) is a plan view showing an example of fixing the long member by the upper fixing part. In FIG. 2(b), the pair of main reinforcements 3 and the flat plate 44a shown in FIG. 2(a) are omitted. When the spacer member 70 is lowered to pass between the pair of plate-like members 44 in the state of FIG. 2(a) and then raised and lowered using the spacer member 70, the fixing plate 46 and the pressing member 47 are attached as shown in FIG. 2(b) to fix the long member 12 to the screw-knotted reinforcing bar 10. At the tip side of the pair of plate-like members 44, the pressing member 47 is bridged across the pair of grooves 44b and faces one end side of the fixing plate 46 with the long member 12 sandwiched therebetween. The center part of the pressing member 47 is capable of screwing in a bolt 48 so as to press the long member 12. When the long member 12 is pressed by the bolt 48, the other end side of the fixing plate 46 abuts against the outer circumferential surface of the rotation support part 42. As a result, the elongated member 12 is sandwiched between the fixing plate 46 and the pressing member 47 and fixed.

[0038] The lower end of the threaded reinforcing bar 10 and the lower end of the long member 12 are connected by the lower fixing part 50. The lower fixing part 50 is a structure for fixing the lower end of the long member 12 to the lower end of the threaded reinforcing bar 10. FIG. 3 is a plan view illustrating the structure of the lower fixing part. As shown in FIG. 1 and FIG. 3, the lower fixing part 50 has a fixing metal fitting 51, a lowest spacer member 52, and a separate collar 53. The fixing metal fitting 51 and the separate collar 53 are members for gripping the long member 12 via the lowest spacer member 52. The fixing metal fitting 51 is a metal fitting for fixing the separate collar 53. The fixing metal fitting 51 may be, for example, a steel having a U-shaped cross section with a width sufficient to fix the separate collar 53 with, for example, two bolts. The fixing metal fitting 51 is fixed to the side of the lower housing 24 by, for example, welding. The separate collar 53 is a known split collar member that is integrated by, for example, fastening a screw and can be separated by removing the screw.

[0039] The lowest spacer member 52 is a cylindrical member that is inserted into the long member 12 and is located at the lower end of the long member 12. The lower end of the lowest spacer member 52 is placed on the concrete surface 4 on which the lower housing 24 of the drive unit 20 is placed. The lowest spacer member 52 has a length dimension according to the mounting height of the reinforcing bars 2, and serves as a reference for the height position of the spacer member 70. That is, the lower end of the spacer member 70 abuts against the upper end of the lowest spacer member 52, thereby determining the height position of the spacer member 70, and thus serving as a height reference for the mounting height of the reinforcing bars 2 supported by the spacer member 70. The lowest spacer member 52 is, for example, held by a separable separate collar 53 and fixed to the fixing bracket 51.

[0040] The lowest spacer member 52 is sandwiched between a pair of main reinforcements 3 and fixed by a flat plate 54 extending across the pair of main reinforcements 3. The flat plate 54 is, for example, an iron plate, and is fixed, for example, by welding, so as to be in contact with the outer circumferential surface of the lowest spacer member 52. By fixing each of the pair of main reinforcements 3 to the flat plate 54 with, for example, a U-bolt, the lowest spacer member 52 is indirectly fixed to the main reinforcements 3, and displacement along the horizontal plane is suppressed. Note that the main reinforcements 3 are indicated by dashed lines in FIG. 1, and the flat plate 54 is fixed to a position different from the separate collar 53 in the axial direction of the lowest spacer member 52.

[0041] Returning to FIG. 1, the advancing / retreating member 60 is a member that advances and retreats along the axial direction of the threaded rebar 10 in response to the driving force of the driving source 21. The advancing / retreating member 60 cooperates with the threaded rebar 10 to convert the driving force of the driving source 21 into the conveying force of the conveying device 1. In other words, the driving source 21 moves the advancing / retreating member 60 forward and backward relative to the threaded rebar 10. The inner peripheral surface 60a of the advancing / retreating member 60 screws into the threads of the threaded rebar 10. The advancing / retreating member 60 is a rebar nut, and for example, a so-called threading coupler can be used.

[0042] A hoisting shackle 61 is attached to the advancing / retreating member 60 to connect the advancing / retreating member 60 and the spacer member 70. FIG. 4 is a plan view showing the relationship between the lifting unit and the spacer member. FIG. 5 is a side view showing an example of releasing the connection of the engagement unit. As shown in FIG. 1, FIG. 4, and FIG. 5, the hoisting shackle 61 is, for example, U-shaped and has bolt holes at both ends. The hoisting shackle 61 is attached to the advancing / retreating member 60, for example, by welding a pair of nuts to the side of the advancing / retreating member 60 and screwing a bolt inserted into the bolt hole into the nut. The bolt inserted into the bolt hole is rotatable relative to the bolt hole. Therefore, the hoisting shackle 61 is swingable relative to the advancing / retreating member 60. The hoisting shackle 61 connects the advancing / retreating member 60 and the spacer member 70 by engaging with a hook 74 of the spacer member 70 described later. The advancing and retreating member 60 and the spacer member 70 constitute a lifting and lowering unit of the transport device 1 that is lifted and lowered by the driving unit 20 .

[0043] The spacer member 70 is a member that is provided so as to be movable along the long member 12. As an example, the spacer member 70 here is connected to the advancing and retreating member 60 and the hanging shackle 61 and moves up and down along the long member 12 in a suspended state. The spacer member 70 has a tubular member 71 that is inserted into the long member 12. The inner diameter of the tubular member 71 may be slightly (for example, 1 mm to 2 mm) larger than the outer diameter of the long member 12. The spacer member 70 is movable without significant inclination relative to the long member 12 when inserted into the long member 12. The length dimension of the spacer member 70 along the long member 12 corresponds to the reinforcing bar pitch (reinforcing bar spacing) of the reinforcing bars 2 along the main reinforcement 3. Here, the length of the tubular member 71 (the height of one spacer member 70) is set to the same dimension as the reinforcing bar pitch of a given reinforcing bar 2. The reinforcing bar pitch of the reinforcing bars 2 is the design value of the interval between adjacent reinforcing bars 2 in the extension direction of the main bars 3. By appropriately changing the diameter and length of the spacer member 70 and the long member 12, it is possible to apply the reinforcing bars 2 of any diameter and reinforcing bar pitch.

[0044] The spacer member 70 is provided with a support portion 72 that supports the reinforcing bars 2. The support portion 72 is fixed to a predetermined position in the longitudinal direction of the tubular member 71. In a plurality of spacer members 70, the support portions 72 are fixed to the tubular member 71 at the same positions. The support portions 72 illustrated in Figs. 1, 4 and 5 are configured to support one reinforcing bar 2 per one spacer member 70.

[0045] The support portion 72 can be configured using, for example, an L-shaped angle bar. One side 72a of the L-shaped angle bar is fixed to the tubular member 71 of the spacer member 70 so as to extend along a direction perpendicular to the long member 12. One side 72a of the L-shaped angle bar is fixed to the tubular member 71 of the spacer member 70 so that a tip end of the other side 72b of the L-shaped angle bar faces upward along the extension direction of the long member 12. One side 72a of the L-shaped angle bar is cut out in an arc shape along the outer shape of the tubular member 71, for example, and is butted against and welded to a lower end portion 71a of the tubular member 71.

[0046] The distribution bars 2 are placed on the upper surface of one side 72a of the L-shaped angle bar, so that the distribution bars 2 are supported by the spacer member 70. The other side 72b of the L-shaped angle bar functions as a wall section that prevents the distribution bars 2 from falling. The other side 72b of the L-shaped angle bar may be provided with a protrusion 73 to prevent the distribution bars 2 from jumping out. The protrusion 73 may be, for example, a bolt screwed into a screw hole drilled in the other side 72b of the L-shaped angle bar. The positions of the long member 12 and the spacer member 70 are configured so that the distribution bars 2 placed on the upper surface of one side 72a of the L-shaped angle bar can be positioned in contact with a pair of main reinforcements 3, as shown in FIG. 4.

[0047] The spacer member 70 has a hook (engagement portion) 74 on its side surface that engages with the hanging shackle 61. The hook 74 is provided on an upper end portion 71b of the tubular member 71, for example, on the side surface of the tubular member 71 opposite the support portion 72. When the support portion 72 is positioned on the opposite side to the advancing / retracting member 60, for example, the hook 74 faces the advancing / retracting member 60.

[0048] The hook 74 is, for example, a flat plate formed into a hook shape (L-shape) in a side view. The flat plate is, for example, an iron plate, and is fixed to the tubular member 71 by, for example, welding. The flat plate has, for example, a horizontal portion 74a extending from an upper end portion 71b of the tubular member 71 along a direction perpendicular to the axial direction of the tubular member 71, and a vertical portion 74b extending downward from the tip of the horizontal portion 74a. A space 75 surrounded by the horizontal portion 74a, the vertical portion 74b, and the side surface of the tubular member 71 has a size capable of receiving the shackle 61 and opens downward. The lower end portion of the vertical portion 74b may be obliquely cut out so as to guide the shackle 61 into the space 75. The fixing positions of the support portion 72 and the hook 74 in the spacer member 70 are not limited to the above example.

[0049] When the hook 74 is engaged with the hanging shackle 61, the moving member 60 is connected to the spacer member 70. The spacer member 70, which is tethered to the moving member 60, moves while supporting the reinforcing bar 2 with the support part 72, thereby raising and lowering the reinforcing bar 2. In other words, the spacer member 70 is configured to move along the long member 12 according to the operation of the drive part 20. Incidentally, the moving member 60 is prevented from rotating together with the threaded reinforcing bar 10 by being connected to the spacer member 70. In the example of FIG. 4, the moving member 60 may have a co-rotation prevention member 62 fixed to it by, for example, welding. The co-rotation prevention member 62 has a length that extends to the side of the spacer member 70, and when the hook 74 is not engaged with the hanging shackle 61 (when the moving member 60 is raised as described below), the moving member 60 is prevented from rotating together with the threaded reinforcing bar 10 by the co-rotation prevention member 62 abutting against the side of the spacer member 70.

[0050] The conveying device 1 may include a control unit 80 that controls the driving sources 21 of the multiple conveying devices 1 to synchronize with each other (see FIG. 6(a)). When multiple conveying devices 1 are used to raise and lower one reinforcing bar 2, the control unit 80 controls the driving sources 21 of the respective conveying devices 1 to synchronize with each other based on the rotation speed of the driving source 21 or the threaded reinforcing bar 10. The conveying device 1 may include a tachometer (not shown) that detects the rotation speed of the driving source 21 or the threaded reinforcing bar 10. The control unit 80 may be configured as a general computer equipped with, for example, a processor, a storage unit, a communication unit, and a user interface. The control unit 80 is connected to the multiple conveying devices 1 arranged, for example, wirelessly or by wire via the communication unit so as to be able to communicate with each other, and controls the rotation speeds of the motors to be synchronized with each other.

[0051] Note that multiple conveying devices 1 may be used in mechanical synchronization. For example, the multiple conveying devices 1 may be configured to be able to be fitted with a connecting shaft 26 that transmits driving force to other conveying devices 1 (see FIG. 6(b)). The gear boxes 22a of adjacent conveying devices 1 may be connected to each other by the connecting shaft 26. In this case, the rotation of the external motor is input to the drive unit 20 and transmitted to the other conveying devices 1 as rotation about the axis of the connecting shaft 26 extending horizontally.

[0052] Rebar Placement Method A reinforcing bar arrangement method for arranging reinforcing bars 2 intersecting multiple main bars 3 in arranging reinforcement of a reinforced concrete structure using the reinforcing bar arrangement device 100 configured as described above will be described below. Fig. 6(a) is a schematic plan view showing a first arrangement example of multiple long members. Fig. 6(b) is a schematic plan view showing a second arrangement example of multiple long members. Fig. 6(c) is a schematic plan view showing a third arrangement example of multiple long members. Fig. 7 is a flow chart showing an example of the reinforcing bar arrangement method.

[0053] In Fig. 6(a) to Fig. 6(c), the small white circle indicates the position of the main reinforcement 3. The large black circle indicates the long member 12 arranged in parallel along the main reinforcement 3, and corresponds to the conveying device 1 to which the driving force from the driving source 21 is input. The large white circle indicates the long member 12 arranged in parallel along the main reinforcement 3, and corresponds to the conveying device 1 that is synchronously subordinate to the conveying device 1 of the large black circle via the connecting shaft 26. In this way, all of the multiple conveying devices 1 may be equipped with independent driving sources 21, and the respective driving sources 21 may be synchronously controlled by the control unit 80, or the conveying device 1 may be equipped with a driven conveying device 1 using the connecting shaft 26. In the driven conveying device 1, the input of the driving force by the connecting shaft 26 may be regarded as the driving source 21. In each of the multiple long members 12, the spacer member 70 is configured to rise and fall along the long member 12 in accordance with the synchronous operation of each driving unit 20.

[0054] First, multiple long members 12 are installed in the arrangement range of the distribution bars 2 (S01: installation step). Here, multiple transport devices 1 are installed in the arrangement range of the distribution bars 2 with the screw rebars 10 extending along the main bars 3, so that the long members 12 are arranged in parallel along the main bars 3 and multiple long members 12 are installed in the arrangement range of the distribution bars 2. The arrangement range of the distribution bars 2 means the extension range of the distribution bars 2 in which one distribution bar 2 tied to multiple main bars 3 extends, and corresponds to the range of the line indicated by the symbol 2 in Figures 6(a) to 6(c).

[0055] The arrangement range of the distribution reinforcement 2 may be, for example, a linear arrangement range as shown in FIG. 6(a). The arrangement range of the distribution reinforcement 2 may be a curved arrangement range in which the distribution reinforcement 2 is partially bent along the shape of the skeleton of the reinforced concrete structure as shown in FIG. 6(b). The arrangement range of the distribution reinforcement 2 may be a pair of linear arrangement ranges corresponding to each of the pair of linearly arranged main reinforcement 3 when the pair of linearly arranged main reinforcement 3 are connected by a width stopper 5 as shown in FIG. 6(c). The distribution reinforcement 2 is transported in the vertical direction (for example, from above to below) while existing in the arrangement range of the distribution reinforcement 2 in a planar view, for example, along a horizontal plane.

[0056] In the past, as a method for reducing the labor required for assembling distribution bars, there was a method (Nopp Carry method) in which several levels were prefabricated in a temporary yard near the planned construction site of the skeleton of a reinforced concrete structure and erected all at once. However, this method required a temporary yard with the same area as the skeleton, making it difficult to adopt in narrow places. However, with the transport device 1 and rebar placement device 100, the area occupied in a plan view is significantly reduced, making it easy to place multiple devices on a flat surface, and it is also possible to place distribution bars for skeletons with complex side shapes. Also, since the width stop bars 5 can be installed in advance and then the distribution bars 2 can be placed, the installation work of the width stop bars 5 is easier than if they were installed after the placement of the distribution bars 2.

[0057] 1 and 5, in each of the plurality of long members 12, the reinforcing bars 2 are supported by the support parts 72 (S02: supporting step). For example, in the upper part of a scaffold erected around the skeleton of a reinforced concrete structure, in each of the plurality of conveying devices 1, the reinforcing bars 2 are placed on the upper surface of one side 72a of the L-shaped angle material of the support parts 72, thereby placing the reinforcing bars 2 on the support parts 72 of the spacer members 70.

[0058] Next, in each of the plurality of long members 12, the spacer member 70 with the reinforcing bars 2 supported by the support parts 72 is lowered along the long members 12 in accordance with the lowering movement of the advancing and retreating members 60 and the hanging shackles 61, and stacked sequentially from the lower end side of the long members 12 (S03: moving step). For example, the driving sources 21 of the plurality of conveying devices 1 are synchronously controlled, or the plurality of conveying devices 1 are mechanically synchronized, and each of the advancing and retreating members 60 of the plurality of conveying devices 1 is advanced so as to descend collectively. In the conveying device 1, the driving source 21 rotates the threaded reinforcing bars 10, thereby advancing the advancing and retreating members 60 having a nut structure from above downward.

[0059] As shown in FIG. 5, when the spacer member 70 is lowered from above the long member 12, the hook 74 is engaged with the hoisting shackle 61, and the weight of the spacer member 70 and the weight of the reinforcing bars 2 act on the hoisting shackle 61. In this state, the spacer member 70 moves downward along the long member 12 while maintaining the state of being suspended from the advancing / retreating member 60 via the hoisting shackle 61 when the advancing / retreating member 60 advances downward. In other words, the hook 74 maintains the connection with the hoisting shackle 61 by applying the weight of the spacer member 70 to the hoisting shackle 61 while engaged with the hoisting shackle 61. In this way, the spacer member 70 descends along the long member 12 while suspended from the advancing / retreating member 60 and the hoisting shackle 61 via the hook 74, and transports the reinforcing bars 2. The descended spacer member 70 is stacked on the spacer member 70 present below or the lowest spacer member 52. The spacer member 70 present below means the spacer member 70 that was lowered prior to the currently lowered spacer member 70. By repeating this lowering operation for the plurality of spacer members 70 in sequence, the spacer members 70 are stacked in sequence from the lower end side of the elongated member 12.

[0060] Note that a plurality of spacer members 70 may be moved all at once along the elongated member 12 by placing another spacer member 70 on the spacer member 70 suspended from the advancing / retreating member 60 via the hoisting shackle 61. In this case, the hook 74 of the other spacer member 70 placed on the suspended spacer member 70 is not essential.

[0061] In the moving step, after the lowered reinforcing bars 2 are placed in each of the multiple long members 12, the advancing / retreating member 60, which has been released from the connection with the spacer member 70, may be moved to retreat along the long members 12. For example, after the spacer member 70 hits and stops against a spacer member 70 present below or the lowest spacer member 52, the advancing / retreating member 60 is further lowered so that only the hoisting shackle 61 descends relative to the hook 74, and the engagement between the hoisting shackle 61 and the hook 74 is released. In other words, the hook 74 releases the connection between the advancing / retreating member 60 and the hoisting shackle 61 by no longer applying the weight of the spacer member 70 to the hoisting shackle 61.

[0062] The shackle 61 that has been released from the hook 74 swings away from the hook 74 as shown by the two-dot chain line in Fig. 5, and therefore does not re-engage with the hook 74 even if the advancing / retreating member 60 rises. Therefore, the advancing / retreating member 60 can be separated from the spacer member 70 and retreat upwards on its own. After that, the next spacer member 70 is attached to the advancing / retreating member 60 again at the top of the scaffolding, and the reinforcing bars 2 are supported by the support parts 72, allowing the advancing / retreating member 60 to be lowered.

[0063] In the moving step, the spacer members 70 are moved sequentially along the long members 12 for each of the long members 12, and the spacer members 70 are stacked, so that the reinforcing bars 2 can be erected in multiple stages. For example, as shown in FIG. 1, when the spacer members 70 are inserted sequentially into the long members 12, the first spacer member 70 moves downward along the long members 12 and stops by hitting the lowest spacer member 52 that is already present below. The second and subsequent spacer members 70 move downward along the long members 12 and hit the spacer members 70 that are already present below and stop. Here, the height of the spacer member 70 (the length of the tubular member 71) is the same dimension as the reinforcing bar pitch of the predetermined reinforcing bars 2. In the multiple spacer members 70, the positions at which the support parts 72 are fixed to the tubular members 71 are the same as each other. After the spacer member 70 hits a spacer member 70 below or the lowest spacer member 52 and stops, the spacer member 70 functions as a stand that holds the reinforcing bars 2. Therefore, by stacking a plurality of spacer members 70 on top of each other, the intervals between the reinforcing bars 2 supported by each support portion 72 match the reinforcing bar pitch of the predetermined reinforcing bars 2, and the reinforcing bars 2 are erected in a plurality of stages.

[0064] In addition, while the spacer members 70 function as a frame for holding the reinforcing bars 2, the reinforcing bars 2 are tied to the main reinforcing bars 3 using, for example, wires. After the reinforcing bars 2 are tied to the main reinforcing bars 3, the spacer members 70 that functioned as frames may be buried in concrete together with the main reinforcing bars 3 and the reinforcing bars 2, or may be dismantled and reused. When dismantling and reusing, first, the separate collar 53 of the lower fixing part 50 is divided, and the cylindrical member of the lowest spacer member 52 is divided, so that the lowest spacer member 52 is removed from the long member 12. By removing the protrusion 73 on the other side 72b of the L-shaped angle material, interference between the protrusion 73 and the reinforcing bars 2 is eliminated, and the spacer members 70 are further moved downward by the height of the lowest spacer member 52. In this case, the tip of the other side 72b of the L-shaped angle iron of each spacer member 70 will be below the reinforcing bar 2, so that the entire conveying device 1 can be moved in a direction away from the reinforcing bar 2 (to the left on the page in the example of Figure 1) and removed, making it possible to dismantle and reuse multiple spacer members 70.

[0065] According to the reinforcing bar arrangement device 100 and reinforcing bar arrangement method described above, the long members 12 are arranged in parallel along the main reinforcement 3. The spacer member 70 is configured to move along the long member 12 in accordance with the operation of the drive unit 20. The spacer member 70 moves by the operation of the drive unit 20 with the reinforcing bars 2 supported by the support parts 72. Here, since the length dimension of the spacer member 70 along the long member 12 corresponds to the predetermined reinforcing bar pitch (reinforcing bar spacing) of the reinforcing bars 2 along the main reinforcement 3, for example, when a plurality of spacer members 70 are arranged along one long member 12, the spacing between the reinforcing bars 2 supported by the support parts 72 of the plurality of spacer members 70 matches the predetermined reinforcing bar pitch of the reinforcing bars 2. Therefore, according to the reinforcing bar arrangement device 100 and reinforcing bar arrangement method, the reinforcing bars 2 that cross a plurality of main reinforcement bars 3 can be easily arranged in the reinforcement of a reinforced concrete structure.

[0066] According to the reinforcing bar arrangement device 100 and the reinforcing bar arrangement method, the main reinforcements 3 extend in the vertical direction, the long members 12 are installed in the arrangement range of the reinforcing bars 2, and the spacer members 70 with the reinforcing bars 2 supported by the support parts 72 are stacked in sequence from the lower end side of the long members 12 in each of the long members 12. As a result, the spacer members 70 with the reinforcing bars 2 supported by the support parts 72 in each of the long members 12 installed in the arrangement range of the reinforcing bars 2 are stacked in sequence from the lower end side of the long members 12. The stacked spacer members 70 function as a stand for erecting the reinforcing bars 2 in multiple stages. Therefore, the work of assembling the stand and the work of adjusting the stand height for laying the reinforcing bars can be omitted. In other words, since the spacer members 70 function as a stand for holding the reinforcing bars 2, it is not necessary to separately prepare a steel stand for assembling the reinforcing bars in a shelf-like manner as has been used in the past. Therefore, the labor required for assembling the steel frame for assembling reinforcing bars and the steel materials required can be significantly reduced.

[0067] The spacer member 70 is a tubular member having a hook 74 on its side that engages with the hoisting shackle 61 of the transport device 1 that is raised and lowered by the drive unit 20, and is raised and lowered while suspended from the hoisting shackle 61 via the hook 74. The hook 74 maintains the connection with the hoisting shackle 61 by applying the weight of the spacer member 70 to the hoisting shackle 61, and releases the connection with the hoisting shackle 61 by not applying the weight of the spacer member 70 to the hoisting shackle 61. As a result, when the spacer member 70 is suspended, the weight of the spacer member 70 acts on the hoisting shackle 61 via the hook 74, and the state in which the spacer member 70 is suspended from the hoisting shackle 61 is maintained. On the other hand, in the case of the spacer members 70 stacked in sequence, the weight of the spacer member 70 that was acting on the hoisting shackle 61 no longer acts on the hoisting shackle 61, and the connection of the hook 74 between the hoisting shackle 61 and the spacer member 70 is automatically released. In this way, the engagement between the spacer member 70 and the hoisting shackle 61 after the transportation of the reinforcing bars 2 can be automatically released.

[0068] Furthermore, the conveying device (rebar conveying device) 1 and the rebar conveying method make it easier to mechanize the arduous task of manually handling heavy objects, such as large reinforcement bars 2 used in large-scale reinforced concrete structures.

[0069] In addition, since the distribution bars 2 are automatically arranged at a pitch of the length (height) of the spacer members 70, by stacking multiple spacer members 70 in sequence, the distribution bars 2 can be easily and accurately arranged at a predetermined pitch, eliminating the need for, for example, manually marking the placement positions of the distribution bars 2 on the main reinforcement bars 3.

[0070] Furthermore, the setting (placing) of the distribution bars 2 on the support parts 72 of the spacer members 70 and the lowering of the spacer members 70 can be performed by repeated work at the top of the scaffolding. This eliminates the need for workers assembling the main reinforcements 3 and the distribution bars 2 to move widely, up, down, left and right, on the scaffolding and overhanging bracket scaffolding surrounding the reinforced concrete structure, improving safety by reducing work at height. Furthermore, it also eliminates the need for a crane to hoist the distribution bars 2 with a sling wire into the narrow gap between the scaffolding and the reinforced concrete structure, improving safety. For example, when an internal combustion engine crane truck is used, fuel consumption can be reduced, which is expected to reduce CO2 emissions.

[0071] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be embodied in various forms.

[0072] In the above embodiment, the conveying device 1 is exemplified as the lifting device that lifts and lowers the spacer member along the long member in accordance with the operation of the driving unit, and the reinforcing bar arrangement device 100 is exemplified as being suitably used for the conveying device 1, but the present invention is not limited to this example. For example, the reinforcing bar arrangement device and the reinforcing bar arrangement method may be modified as shown in Figs. 8 to 11.

[0073] Fig. 8 (a) to (c) are side views showing an example of use of a reinforcing bar arrangement device according to a modified example. Fig. 9 is a side view showing an example of the internal structure of the spacer member of Fig. 8. Fig. 10 (a) to (c) are side views showing a continuation of the use example of Fig. 8. Fig. 11 (a) to (c) are side views showing a continuation of the use example of Fig. 10. In the modified examples of Figs. 8 to 11, configurations that are mainly different from the above embodiment will be described.

[0074] In the example of Figures 8 to 11, the lifting device is simply constructed using a long member and a spacer member as a lifting device that raises and lowers the spacer member along the long member, which differs from the configuration in which a separate conveying device 1 is provided as in the above embodiment.

[0075] The reinforcing bar placement device 100A comprises a long member 12A arranged in parallel along the main reinforcement 3, a spacer member 70A arranged movably along the long member 12A, and a support portion 72A provided on the spacer member 70A and supporting the reinforcement bar 2.

[0076] A plurality of long members 12A are installed within the arrangement range of the reinforcing bars 2, as shown in Fig. 6, and Figs. 8, 10, and 11 show one of them from a side view. The long member 12A is a rod-shaped member with a male thread, and for example, a threaded screw or a threaded reinforcing bar can be used. The upper end of the long member 12A may be fixed to the main bar 3, as shown in Fig. 8(a), for example.

[0077] In the elongated member 12A, one nut 76 is screwed onto one spacer member 70A. As shown in Figures 8(a) and (b), the spacer member 70A is placed from above onto the nut 76 screwed onto the elongated member 12A.

[0078] More specifically, as shown in Figures 8, 9(a) and 10, the spacer member 70A has a tubular member 71A that defines an internal space with the upper end 71Ab as the bottom. The length dimension of the spacer member 70A along the long member 12A corresponds to the predetermined reinforcing bar pitch (reinforcing bar spacing) of the reinforcing bars 2 along the main bars 3. In Figure 9, the nuts 76 are shown in solid lines for ease of visibility.

[0079] The spacer member 70A is configured to rise and fall along the elongated member 12A in accordance with the operation of the driving unit 20A. The nut 76 is sized to fit into the internal space of the tubular member 71A. In the internal space of the tubular member 71A, a fitting portion 77 having, for example, a hexagonal shape is formed at the bottom of the upper end portion 71Ab side so as to fit into the nut 76. As a result, by covering the nut 76 screwed into the elongated member 12A from above with the spacer member 70A, the nut 76 and the fitting portion 77 are fitted together, and the nut 76 and the spacer member 70A can rise and fall together.

[0080] As shown in FIG. 10(a), the long member 12A is rotated by the driving unit 20A, so that the nut 76 and the spacer member 70A move up and down together. The driving unit 20A rotates, for example, the upper end of the long member 12A. As with the driving source 21 of the above embodiment, the driving unit 20A may be, for example, a commercially available rechargeable electric drill or electric impact driver. The lower end of the long member 12A is rotatably supported by the bearing unit 27. The bearing unit 27 has, for example, a substantially cylindrical shape on which the lower end 71Aa of the cylindrical member 71A can be placed, and the lower end of the long member 12A is inserted. The bearing unit 27 may include an angular bearing and a thrust bearing that rotatably support the lower end of the long member 12A. The bearing unit 27 is placed on the concrete surface 4.

[0081] 9(b) and 10, after the spacer member 70A hits the spacer member 70A below or the bearing portion 27 and stops, the elongated member 12A can be rotated as it is using the driving unit 20A, so that only the nut 76 can be lowered while the spacer member 70A remains stationary. When only the nut 76 is lowered and the fitting portion 77 is no longer fitted, the nut 76 rotates together with the elongated member 12A even if the elongated member 12A is rotated using the driving unit 20A, and the nut 76 will no longer be lowered from that point.

[0082] The support portion 72A protrudes, for example, from an upper end portion 71Ab of the cylindrical member 71A at a substantially right angle to the axial direction. In the plurality of spacer members 70A, the support portions 72A are provided at the same positions on the cylindrical member 71A. The support portion 72A can be configured to have an L-shape in a side view, for example.

[0083] A reinforcing bar arrangement method using such a reinforcing bar arrangement device 100A will be described. First, a plurality of long members 12A are arranged in the arrangement range of the reinforcing bars 2 (S01: installation step in Fig. 7). Here, as shown in Fig. 8(a), the long members 12A are arranged in parallel along the main bars 3. As in Fig. 6 described above, a plurality of long members 12A arranged in parallel along the main bars 3 are arranged in the arrangement range of the reinforcing bars 2. As shown in Figs. 8(a) and (b), a nut 76 is screwed onto the long member 12A, and a spacer member 70A is placed from above over the nut 76 screwed onto the long member 12A.

[0084] 8(b) and 8(c), the reinforcing bars 2 are supported by the support parts 72A of each of the long members 12A (S02 in FIG. 7: supporting step). For example, on top of a scaffolding erected around the framework of the reinforced concrete structure, the reinforcing bars 2 are placed on the upper surfaces of the support parts 72A of each of the long members 12A, thereby placing the reinforcing bars 2 on the support parts 72A of the spacer member 70A.

[0085] 10(a) to 10(c), the drive unit 20A is used to rotate each of the multiple long members 12A, thereby lowering the nut 76 and the spacer member 70A together. The spacer member 70A, with the reinforcing bars 2 supported by the support portions 72A, is lowered along the long member 12A in accordance with the operation of the drive unit 20A, and is stacked sequentially from the lower end portion 71Aa side of the long member 12A (S03 in FIG. 7: moving step).

[0086] In the moving step, the spacer members 70A are moved sequentially along the long members 12A in each of the long members 12A, and the spacer members 70A are stacked, so that the reinforcing bars 2 can be erected in multiple stages. For example, as shown in Figs. 10(a) and (b), when the spacer members 70A are inserted sequentially into the long members 12A, the first spacer member 70A moves downward along the long members 12A, and as a result, it hits the bearing portion 27 that is already present below and stops. The second and subsequent spacer members 70A move downward along the long members 12A, and as a result, it hits the spacer members 70A that are already present below and stops. Here, the height of the spacer members 70A (the length of the tubular members 71A) is the same dimension as the reinforcing bar pitch of the predetermined reinforcing bars 2. In the multiple spacer members 70A, the positions where the support portions 72A are provided on the tubular members 71A are the same as each other. 10(c), after the spacer member 70A hits the spacer member 70A below or the bearing portion 27 and stops, the spacer member 70A functions as a stand that holds the reinforcing bars 2. Therefore, by stacking a plurality of spacer members 70A on top of each other, the intervals between the reinforcing bars 2 supported by each support portion 72A match the reinforcing bar pitch of the predetermined reinforcing bars 2, and the reinforcing bars 2 are erected in multiple stages.

[0087] With the spacer members 70A functioning as a frame for holding the reinforcing bars 2, the reinforcing bars 2 are tied to the main reinforcing bars 3 using, for example, wire or the like. After the reinforcing bars 2 are tied to the main reinforcing bars 3, the spacer members 70 that functioned as frames may be buried in concrete together with the main reinforcing bars 3 and the reinforcing bars 2, or may be dismantled and reused. When dismantling and reusing, first, as shown in FIG. 11(a), an eye nut 13 is attached to the upper end of the long member 12A, and the long member 12A is lifted upward, for example, by a crane (not shown). Then, the long member 12A is moved upward until it comes out of the bearing portion 27, and the bearing portion 27 is removed.

[0088] When removing the bearing portion 27, the distance that the long member 12A can move upward is until the nut 76 reaches the bottom of the upper end portion 71Ab side in the internal space of the tubular member 71A. Therefore, the depth of the fitting portion 77 may be made larger than the insertion length of the lower end of the long member 12A into the bearing portion 27, so that the long member 12A can be moved upward to an extent that the bearing portion 27 can be removed. This allows the long member 12A, the eye nut 13, and the nut 76 to be moved upward without moving the spacer member 70A in a state in which the reinforcing bar 2 is supported by the support portion 72A. Alternatively, when the depth of the fitting portion 77 is smaller than the insertion length of the lower end of the long member 12A into the bearing portion 27, for example, the bearing portion 27 may be configured to be divisible into two or more parts in a cross section along the axial direction.

[0089] 11(b), the long member 12A that was lifted is moved downward by, for example, a crane (not shown) or the like, and the support part 72A is moved downward, leaving the distribution bars 2 tied to the main bars 3. Here, the long member 12A is moved downward to a position where the distribution bars 2 and the support part 72A do not interfere with each other in the horizontal direction. Then, as shown in FIG. 11(c), the long member 12A is moved horizontally so that the support part 72A avoids the distribution bars 2, thereby removing the long member 12A, the eye nuts 13, the spacer members 70, and the nuts 76, and the multiple spacer members 70 can be disassembled and reused.

[0090] As described above, the reinforcing bar arrangement device 100A and reinforcing bar arrangement method according to the modified example also make it possible to easily arrange the reinforcing bars 2 that intersect with the multiple main bars 3 extending in the vertical direction in the arrangement of reinforced concrete structures. Furthermore, by using the spacer member 70A that is configured to be lowered by rotating the upper end of the long member 12A with the driving unit 20A, personnel to receive the reinforcing bars 2 at the lower end side of the long member 12A is not required.

[0091] In the reinforcing bar arrangement device 100, 100A according to the above embodiment and modified example, the spacer member 70, 70A is configured to move along the long member 12, 12A according to the operation of the driving unit 20, 20A, but is not limited to this example. For example, as shown in Figures 12(a) and 12(b), the present invention includes an embodiment of a reinforcing bar support frame 200, 200A that does not include a driving unit. The reinforcing bar support frame 200, 200A is roughly equivalent to, for example, the reinforcing bar arrangement device 100 without the transport device 1.

[0092] The reinforcing bar support frame 200 includes long members 12 arranged in parallel along the main reinforcement 3, spacer members 70 arranged movably along the long members 12, and support parts 72 attached to the spacer members 70 and supporting the reinforcing bars 2. The length of the spacer members 70 along the long members 12 corresponds to the spacing of the reinforcing bars 2 along the main reinforcement 3. The reinforcing bar support frame 200 uses spacer members 70 having hooks 74. The reinforcing bar support frame 200A is basically configured similarly to the reinforcing bar support frame 200, but uses spacer members 70 that do not have hooks 74. The reinforcing bar support frame 200A may omit the protrusions 73.

[0093] In the reinforcing bar support stands 200, 200A, for example, the lowest spacer member 71S is placed on the concrete surface 4 with the lowest spacer member 71S inserted into the long member 12. The lowest spacer member 71S has a length dimension such that the height of the reinforcing bar 2 supported by the support portion 72 of the lowest spacer member 70 is a predetermined mounting height. In the reinforcing bar support stands 200, 200A, the spacer member 70 with the tubular member 71 inserted into the long member 12 is moved downward from the upper end of the long member 12, so that the multiple spacer members 70 are stacked in sequence on the lowest spacer member 71S.

[0094] In the reinforcing bar support stand 200, the hook 74 is suspended by the crane side hook 63 using a lifting machine such as a crane, and the spacer member 70 is moved along the long member 12. The reinforcing bars 2 may be placed in advance on the support parts 72 of the spacer member 70, for example, before the spacer member 70 is moved.

[0095] In the reinforcing bar support rack 200A, where the spacer members 70 do not have hooks 74, for example, a plurality of spacer members 70 may be sequentially connected along one long member 12 before placing the reinforcing bars 2 on the support parts 72 of the spacer members 70. Then, the reinforcing bars 2 may be placed on each support part 72 of the stacked spacer members 70. In this case, the method of placing the reinforcing bars 2 on each support part 72 may be a crane or the like, or if the reinforcing bars 2 are thin and lightweight, they may be held and placed by the manual force of a worker.

[0096] As described above, according to the reinforcing bar support 200, 200A, by arranging the reinforcing bars 2 at each of the support parts 72 of the stacked spacer members 70, the reinforcing bars 2 are arranged at the positions of the support parts 72. Here, since the length dimension of the spacer members 70 along the long members 12 corresponds to the predetermined reinforcing bar spacing of the reinforcing bars 2 along the main bars 3, the spacing between the reinforcing bars 2 supported by the support parts 72 of the spacer members 70 matches the predetermined reinforcing bar spacing of the reinforcing bars 2. That is, by moving the spacer members 70 along the long members 12 and stacking them in order, the reinforcing bars 2 are supported along the long members 12 and the reinforcing bar spacing of the reinforcing bars 2 is determined. Therefore, according to the reinforcing bar support 200, 200A, it is possible to omit the process of installing a large-scale pedestal such as scaffolding, and it is possible to easily arrange the reinforcing bars 2 that cross the main bars 3 in the reinforcement of a reinforced concrete structure. After the reinforcing bars 2 are fixed to the main bars 3 with wire or the like, the reinforcing bar support frames 200, 200A may be removed, or may be left in place and concrete poured.

[0097] The support parts 72, 72A illustrated in the above embodiment and modified examples are configured to support one distribution bar 2 per one spacer member 70, 70A, but the support parts 72, 72A may be extended along the horizontal direction so as to support two or more distribution bars 2 per one spacer member 70, 70A. For example, as shown in Fig. 13(a) and Fig. 13(b), in a reinforcing bar arrangement device 100B for arranging two distribution bars 2 for two main bars 3B, a support part 72B capable of supporting two distribution bars 2 may be provided on the spacer member 70B. The support part 72B has, for example, a horizontal plate part 72Ba fixed to the cylindrical member 71B so as to be perpendicular to the axial direction of the cylindrical member 71B, and a pair of vertical plate parts 72Bb fixed to the center and tip of the upper surface of the horizontal plate part 72Ba and extending in the normal direction to the upper surface of the horizontal plate part 72Ba. The horizontal plate portion 72Ba extends to a length that allows two distribution bars 2 to be placed at a predetermined position. The vertical plate portion 72Bb functions as a wall portion that prevents the distribution bars 2 from falling. Each of the vertical plate portions 72Bb may be provided with a protrusion 73. The tubular member 71B is inserted into a long member (not shown) that is arranged in parallel along the two main bars 3B.

[0098] A pair of reinforcing plates 78 extending in the normal direction of the lower surface of the horizontal plate portion 72Ba are joined to the lower surface of the horizontal plate portion 72Ba. The pair of reinforcing plates 78 are joined to the surface of the cylindrical member 71B and to both ends in the short direction of the lower surface of the horizontal plate portion 72Ba, for example, in a state where they face each other substantially parallel to sandwich the cylindrical member 71B. As a result, the load of the reinforcing bars 2 acts in the tangential direction of the outer peripheral surface of the cylindrical member 71B via the reinforcing plates 78, so that deformation of the cylindrical cross section of the cylindrical member 71B can be suppressed compared to a configuration in which the load of the reinforcing bars 2 acts in the normal direction of the outer peripheral surface of the cylindrical member 71B, for example.

[0099] In the above embodiment and modified example, the multiple main reinforcements 3 extend in the vertical direction, but this is not limited to this example. For example, the multiple main reinforcements may extend along a horizontal plane. The reinforced concrete structure may be, for example, a horizontal part of a concrete floor or a mat foundation, and the distribution reinforcement may also extend along a horizontal plane. In short, the reinforcement of the reinforced concrete structure may be reinforcement for constructing a reinforced concrete structure having multiple main reinforcements and distribution reinforcement intersecting the main reinforcements. In this case, the long members may be arranged in parallel along the main reinforcements and extend in the horizontal direction, and the spacer member may be movable in the horizontal direction along the long members. The support part is not particularly limited as long as it supports the distribution reinforcement, but may be, for example, a shape that opens upward so that the distribution reinforcement can be placed thereon.

[0100] In the above embodiment and modified example, the reinforcing bars 2 have an equal pitch (reinforcing bar spacing) but are not limited to this. The reinforcing bar spacing may be unequal. What is important is that the length dimension of the spacer member along the long member corresponds to the reinforcing bar spacing.

[0101] In the above embodiment and modified example, a plurality of elongated members are provided within the arrangement range of the reinforcing bars, but a configuration using a single elongated member is also possible.

[0102] In the above modified examples of Fig. 8 to Fig. 11, the spacer members 70A are moved one by one along the elongated member 12A, but this is not limited to the example. For example, in a state where one or more other spacer members 70A are placed on the lowest spacer member 70A, the lowest spacer member 70A may be moved by the driving unit 20A to move these multiple spacer members 70A all at once along the elongated member 12A. In this case, the nut 76 is not necessary and the fitting portion 77 is not essential for the other spacer member 70A placed on the lowest spacer member 70A.

[0103] In the above embodiment and modified example, the long members 12, 12A have a circular cross section, but are not limited thereto. For example, as in the reinforcing bar arrangement device 100C shown in FIG. 14, the long member 12C may have a notch 12X in a part of the circular cross section. The notch 12X is, for example, a groove formed on the outer circumferential surface of the long member 12C so as to extend along the axial direction of the long member 12C. There is a small gap between the inner circumferential surface of the tubular member 71 of the spacer member 70 and the outer circumferential surface of the long member 12C. When pouring concrete after arranging the reinforcing bars 2, if the spacer member 70 is left in place without being removed, it is possible to fill this gap with grout. The space formed by the notch 12X functions as a flow path for such grout. Therefore, by injecting grout toward the notch 12X in the topmost spacer member 70 among the stacked spacer members 70, it is possible to fill the above-mentioned gaps with grout up to the bottommost spacer member 70. In the example of Fig. 14, one notch 12X is formed in the circular cross section of the long member 12C, but two or more notches 12X may be formed. In this case, when grout is injected into some of the notches 12X, the remaining notches 12X promote air removal. [Explanation of symbols]

[0104] DESCRIPTION OF THE REFERENCE NUMERALS 1...Conveying device, 2...Strength distribution bar (object to be transported), 3, 3B...Main bars, 10...Screw-jointed reinforcing bars, 11...Outer surface, 12, 12A, 12C...Long members, 20, 20A...Driving part, 21...Driving source, 60...Advancing and retreating member (lifting part), 61...Suspension shackle (lifting part), 70, 70A, 70B...Spacer members, 71, 71A, 71B...Cylindrical members, 72, 72A, 72B...Support parts, 74...Hooks (engagement parts), 100, 100A, 100B, 100C...Reinforcing bar placement device, 200, 200A...Reinforcing bar support stand.

Claims

1. A reinforcing bar arrangement device for arranging reinforcing bars that intersect multiple main bars in the arrangement of reinforced concrete structures, A long member arranged in parallel along the main reinforcement; a spacer member provided movably along the elongated member; A support portion provided on the spacer member and supporting the reinforcing bar, The length dimension of the spacer member along the long member corresponds to the reinforcing bar spacing along the main reinforcing bars, The spacer member is configured to move along the elongated member in response to operation of a drive portion.

2. The main reinforcements extend in the vertical direction, The long members are installed in a plurality of locations within the range of the reinforcing bars, 2. The reinforcing bar arrangement device according to claim 1, wherein the spacer members with the reinforcing bars supported by the support portions of each of the plurality of elongated members are stacked in sequence from the lower end side of the elongated member.

3. the spacer member is a tubular member having an engagement portion on a side surface thereof that engages with a lifting portion of a lifting device that is lifted and lowered by the drive portion, and is lifted and lowered while being suspended from the lifting portion via the engagement portion; The engagement portion is The weight of the spacer member is applied to the lifting section to maintain the connection with the lifting section, The reinforcing bar arrangement device according to claim 2 , wherein the connection with the lifting section is released by removing the weight of the spacer member from the lifting section.

4. A rebar arrangement method for arranging reinforcement bars that cross multiple main bars in a reinforced concrete structure, comprising: A long member arranged in parallel along the main reinforcement; a spacer member provided movably along the elongated member; A support portion provided on the spacer member and supporting the reinforcing bar, The length dimension of the spacer member along the long member corresponds to the reinforcing bar spacing along the main reinforcing bars, The spacer member is configured to move along the elongated member in accordance with the operation of a drive unit, using a rebar placement device. an installation step of installing the elongated member; A supporting step of supporting the reinforcing bar on the support portion of the elongated member; a moving step of moving the spacer member, with the reinforcing bar supported by the support portion, along the long member in accordance with the operation of the drive portion.

5. The main reinforcements extend in the vertical direction, In the installation step, a plurality of the elongated members are installed in the arrangement range of the reinforcing bars, In the supporting step, the reinforcing bars are supported by the support portions of each of the plurality of elongated members, 5. The reinforcing bar arrangement method according to claim 4, wherein in the moving step, the spacer members with the reinforcing bars supported by the support portions of each of the plurality of long members are lowered along the long members in accordance with the operation of the driving portion, and are stacked sequentially from the lower end side of the long members.

6. A reinforcing bar support frame for arranging reinforcing bars that cross multiple main bars in the reinforcing bar arrangement of a reinforced concrete structure, A long member arranged in parallel along the main reinforcement; a spacer member provided movably along the elongated member; A support portion provided on the spacer member and supporting the reinforcing bar, A reinforcing bar support stand, wherein the length dimension of the spacer member along the elongated member corresponds to the reinforcing bar spacing along the main reinforcement.

Images