JP7021776B2 - Reinforcing bar holder, rebar lifting device using it, and rebar joint construction method - Google Patents

Description

The present invention relates to a technique for lifting and transporting heavy rod-shaped objects such as reinforced steel rods for construction by a crane, and in particular, for a crane capable of efficiently lifting a plurality of heavy rod-shaped objects in a vertical posture. Necessary for materials, machinery, and parts from the field of manufacturing, providing, and using the lifting equipment, as well as the field of providing and selling the equipment and equipment necessary for its transportation, storage, assembly, and use. Fields that provide materials such as wood, stone, various fibers, plastics, various metal materials, etc., electronic parts incorporated in them, control-related equipment that integrates them, various measuring instruments, and the relevant equipment. , The field of power machinery that moves equipment, the field that is generally called industrial machinery such as the field of electric power and energy source that is the energy, and the field of those equipment and equipment are tested and researched. , Fields related to their exhibition, sales, import / export, generals, fields related to the collection and transportation of garbage generated by the operation of equipment, equipment for making them and the results of their use, etc. In addition to the recycling field, which efficiently reuses these wastes, there are no technical fields that are not related to new fields that cannot be envisioned at this time.

(Point of interest)
Reinforcing bar concrete high-rise buildings are generally used for the upper end of the lower reinforcing bar whose foundation is erected in the reinforcement arrangement process that precedes the form frame process and concrete placing process in the skeleton work following the foundation work and soil floor work. , The work of constructing the reinforcing bar joint is performed so as to connect the lower ends of the upper reinforcing bars. For example, the crane operator sets one upper reinforcing bar suspended from the crane as a target of one lower reinforcing bar. Move closer to the upper end, and the slinging / reinforcing bar joint worker guides the lower end of the upper reinforcing bar to match the upper end of the lower reinforcing bar, joins the lower end of the upper reinforcing bar to the upper end of the lower reinforcing bar, and joins the lap joint and machine. Either the lower end of the upper reinforcing bar is coupled to the upper end of the lower reinforcing bar by either a formula joint or a welded joint, or as shown in FIG. 12, for preparation for construction of a reinforcing bar joint such as a gas pressure welding joint. After performing either work of temporarily fixing by attaching temporary connection equipment such as a pressure welding device PM between the upper end of the lower reinforcing bar UB and the lower end of the upper reinforcing bar SB, the crane is removed from the upper reinforcing bar SB. When the temporary connecting equipment such as the pressure welding device PM is attached after disconnection, the reinforcing bar joint such as the gas pressure welding joint is constructed, and the lower end of the upper reinforcing bar SB is joined and integrated with the upper end of the lower reinforcing bar UB. Similarly, the lower end of the upper reinforcing bar SB is joined to the upper end of the lower reinforcing bar UB, and either the reinforcing bar joint is constructed and joined and integrated, or the reinforcing bar joint is temporarily fixed in preparation for construction. When the work is performed, the crane is separated from the upper reinforcing bar SB, and temporary connection equipment such as the pressure welding device PM is attached, the work of constructing the reinforcing bar joint such as the gas pressure welding joint is repeated, and all the necessary work is performed. The lower end of the upper reinforcing bar SB is connected and integrated with the upper end of the lower reinforcing bar UB, or the lower end of the upper reinforcing bar SB is temporarily fixed and integrated with the upper end of the lower reinforcing bar UB. The method of transporting the upper reinforcing bars SB one by one and constructing the reinforcing bar joints requires a lot of work manpower and has been a factor of raising the construction cost.

(Conventional technology)
Proposals that reflect this situation and provide a solution to it are not unheard of.
For example, as typified by the one proposed in Patent Document 1 (1) below, a through hole is formed in the side surface of a cylindrical cap having a suspended portion at the top, and the base end is pivoted to the cylindrical cap. By inserting the engaged end of the attached locking lever into the through hole freely, the holding ring slidably fitted to the outer peripheral edge of the cylindrical cap presses the cam part of the locking lever. , The rebar can be locked and lifted with a one-touch operation by inserting the end of the rebar into the hollow hole of the cylindrical cap and pushing it in while releasing the hand from the holding ring, improving the workability and work safety of attaching and detaching the rebar to the crane. The rebar hanger and a plurality of rebar garment ends as seen in Patent Document 1 (2) are grasped at a distance to be assembled, and the lower end of the rebar group is housed in a box. Reinforcing bar hanging method and crane that hang the reinforcing bar group together with the housing at the assembly site, release the bottom of the reinforcing bar group, assemble the reinforcing bar while gripping the upper part, and release the grip on the upper part of the reinforcing bar after the assembly of the reinforcing bar is completed. It consists of a suspended beam that hangs down from the hanging beam, a set of reinforcing bar gripping means provided at regular intervals on the suspended beam, and a bottom support that is suspended by a crane or a suspended beam and collectively supports the lower parts of the multiple reinforcing bars. , Multiple reinforcing bars can be hung at the same time at the scheduled assembly interval, and the reinforcing bars can be bound while the reinforcing bars are suspended. Reinforcing bar hanging device that can prevent lateral vibration.

Further, as in Patent Document 1 (3), a jig body that can be suspended at one point by a crane is provided, and a plurality of chains are arranged in parallel in the horizontal direction on the jig body, and the tip of each chain is used. A U-shaped steel plate that is curved and formed in a U-shape and extended in the vertical direction, and a hanging metal fitting composed of pin members are connected to each of the hanging metal fittings, and a coupler is screwed at the upper end of each hanging metal fitting. Since the fitted main reinforcing bars are to be engaged and supported, that is, to be connected to each other, a plurality of vertically extended reinforcing bars are placed parallel to each other at the upper ends of the existing reinforcing bars (lower reinforcing bars). By connecting, it is possible to lift multiple reinforcing bars at once, and it is possible to sequentially perform alignment and joining work at the connection position, and the number of workers who perform these alignment and joining work is as small as possible. A hanging jig that can be fastened, shorten the usage time of the crane, and improve work efficiency, a method of building a reinforcing bar using the hanging jig, and the hanging jig. Reinforcing bar rocking prevention jigs to be used are scattered.

However, although the reinforcing bar hanger and the like as shown in the former Patent Document 1 (1) can safely lift the reinforcing bar and improve the workability of attaching and detaching the reinforcing bar, the upper reinforcing bar A cylindrical cap is attached to the upper end and lifted to the crane. On the other hand, the reinforcing bar joint is installed between the upper end of the lower reinforcing bar and the lower end of the upper reinforcing bar. In addition, there is a gap between the upper and lower ends of the upper reinforcing bar, which is about the length of one upper reinforcing bar, between the lower end of the upper reinforcing bar where the reinforcing bar joint is constructed and the upper end of the upper reinforcing bar that separates from the cylindrical cap. To prepare for the construction of the reinforcing bar joint, or to perform the work of constructing the reinforcing bar joint and the work of removing the cylindrical cap from the upper end of the upper upper reinforcing bar for each upper reinforcing bar, with the worker who constructs the reinforcing bar joint. , A worker who removes the cylindrical cap from the upper end of the upper reinforcing bar is placed in each position, or a worker who constructs a reinforcing bar joint with the lower end of the upper reinforcing bar moves to the upper end of the upper reinforcing bar. In any case, the work of removing the cylindrical cap must be performed, which leaves a fatal drawback that a great deal of labor and manpower is required.

Further, the method of suspending the reinforcing bars of Patent Document 1 (2), the suspending device, and the like can also suspend a plurality of reinforcing bars at once on a crane, and can safely perform the lifting movement. Even though the effect is obtained, the hanger suspended by the hanging beam has a structure that can grip and release the upper part of the reinforcing bar, for example, a short tube having a diameter larger than the diameter of the reinforcing bar. Since it is composed of a retaining bolt screwed to the peripheral surface of the short cylinder and a bracket for suspending a wire projecting from the outer peripheral wall of the short cylinder in the centrifugal direction, the former Patent Document 1 (1) Similar to the cylindrical cap, the length from the lower end of the upper reinforcing bar that prepares for the construction of the reinforcing bar joint or the construction of the reinforcing bar joint to the upper end of the upper reinforcing bar that separates from the cylindrical cap is about the length of one upper reinforcing bar. There is a gap between the upper and lower parts of the rebar, and it takes a lot of labor to prepare for the construction of the reinforcing bar joint, or to perform the work of constructing the reinforcing bar joint and the work of removing the hanger from the upper reinforcing bar at the same time or alternately. It was accompanied by manpower.

The latter, the hanging jig represented by Patent Document 1 (3), the method of building the reinforcing bar using the hanging jig, the reinforcing bar swing prevention jig used for the hanging jig, and the like are also the same. In addition, the upper end of the upper reinforcing bar can be freely attached to and detached from the hanging metal fittings composed of the U-shaped steel plate and the pin members provided at the tips of a plurality of chains arranged in parallel in the horizontal direction on the jig body. Since it is connected, prepare for the construction of the reinforcing bar joint or construct the reinforcing bar joint in the same manner as the cylindrical cap of the former patent document 1 (1) and the hanging tool in the patent document 1 (2). Between the lower end of the upper reinforcing bar and the upper end of the upper reinforcing bar that separates from the hanging bracket, there is a gap between the upper and lower parts that is about the length of one upper reinforcing bar. There is a drawback that the work load cannot be reduced in either the case where the work of the above construction work and the work of removing the hanging tool from the upper reinforcing bar are performed simultaneously or alternately.
(1) Japanese Patent Application Laid-Open No. 59-172377 (2) Japanese Patent Application Laid-Open No. 4-444568 (3) Japanese Patent Application Laid-Open No. 8-218638

(Problem awareness)
As described above, all of the various reinforcing bar lifting devices proposed so far are connected to the upper end of one or more reinforcing bars and have lifting tools for lifting, so that they are connected to the upper end of the upper reinforcing bar. There is a large height difference between the hanging tools that are worn to lift the upper reinforcing bar and the vicinity of the lower end of the upper reinforcing bar where the reinforcing bar joint is installed. In order to smoothly remove the hanging tool from the upper reinforcing bar, a worker who removes the hanging tool from the upper reinforcing bar waits at a high place, and every time one upper reinforcing bar is connected or temporarily fixed to the lower reinforcing bar, After visually confirming that the lower end is securely fixed to the lower rebar and that it is a safe upper rebar even if it is separated from the crane, it is necessary to carefully remove the hanger from the corresponding upper rebar. The current situation is that the work must be repeated for each reinforcing bar, and the safety of the work must be relied on by the careful work of high-altitude workers. Reinforcing bar joint workers who prepare for the construction of the reinforcing bar joints or work on the reinforcing bar joints can also perform the work of removing the upper reinforcing bars from the crane without moving while staying near the lower end of the upper reinforcing bars. I have come to realize the need for further improvement in the configuration to make the reinforcing bar lifting technology feasible.

(Purpose of the invention)
Therefore, the present invention makes it possible to suspend a plurality of reinforcing bars in a vertical posture at intervals in the horizontal direction with respect to the crane, and the reinforcing bar joint worker stays at the working position of the reinforcing bar joint while staying at the working position of the reinforcing bar. Judging that it is possible to develop a new reinforcing bar lifting technology that can separate the reinforcing bar from the reinforcing bar, we quickly started the development and research, and the result of repeating long-term trial and error and many trials and experiments. This time, we have finally succeeded in realizing a new structure rebar holder, a new structure rebar lifting device using it, and a new rebar joint construction method. The configuration thereof will be described in detail together with examples representing the invention.

(Construction of the invention)
As is clearly understood from the examples representing the present invention shown in the drawings, the reinforcing bar holder of the present invention basically has the following configuration.
That is, a hanging rope having a connecting portion to which the crane is connected to the rope is provided at the upper end of the rope, and at the lower end of the hanging rope, from the lower end of the target reinforcing bar to the vicinity directly above the reinforcing bar joint construction length range. A hold vise that can be temporarily attached and detached is provided around the outside of the middle position of the target reinforcing bar, and the target reinforcing bar that is temporarily connected to the hold vise from the lower end where the hold vise of the hanging cord is provided. At least one holding ring that is loosely fitted near the upper end of the target reinforcing bar is provided in the middle of the suspension line facing the upper end , and the lower end of the target reinforcing bar can be loosely fitted to the target reinforcing bar. A positioning cylinder that is a tubular type with an open opening and has a mounting depth regulation bottom at a position where the gauge length is slightly shorter than the reinforcing bar joint construction length from the opening is separate from the suspension cord. It is a reinforcing bar holder whose gist is a structure that is combined as a thing.

The reinforcing bar holder having this basic structure is provided with a hanging rope having a connecting portion at the upper end of the rope to which the crane is connected to the rebar, if the expression is changed. At the lower end, a hold vise that can be detachably and temporarily connected is provided around the outside of the middle position of the target reinforcing bar, which is near directly above the reinforcing bar joint construction length range from the lower end of the target reinforcing bar, and the hold vise of the hanging cable is provided. At least one holding ring that loosely fits toward the upper end of the target reinforcing bar is provided in the middle of the suspension line facing the upper end of the target reinforcing bar when temporarily connected to the hold vise from the lower end. In addition, it is a tubular type with an opening that allows the lower end of the target reinforcing bar to be loosely fitted to the target reinforcing bar, and the mounting depth is at a position where the gauge length is slightly shorter than the reinforcing bar joint construction length from the opening. A positioning cylinder provided with a regulating bottom is combined as a separate body from the hanging cord, and when mounting on the target reinforcing bar, the lower end of the target reinforcing bar is known, and the positioning cylinder is the mounting depth regulated bottom. The holding ring is loosely fitted around the outer periphery near the upper end of the target reinforcing bar, and the hold vise is opened at a position where the gauge length is from the mounting depth regulation bottom of the positioning cylinder. From the lower end of the target reinforcing bar, it is temporarily connected to the outer periphery of the middle position of the target reinforcing bar, which is near the area directly above the reinforcing bar joint construction length range, and from the upper end of the suspension bar, the vertical posture of the target reinforcing bar. It will be a reinforcing bar holder with a structure that can be lifted by a crane so as to maintain.

(Related Invention 1)
In connection with the above-mentioned reinforcing bar holder, the present invention also includes a reinforcing bar lifting device using the same.
That is, it has a balance frame provided with a plurality of suspension portions separated by horizontal intervals, and a balance that can be suspended from a crane is provided, and the balance frames of the balance are provided at least two places separated from each other. Reinforcing bar lifting device using any of the above-mentioned reinforcing bar holders, which is the basis of the present invention, in which at least two reinforcing bar holders are suspended from each of the hanging lower portions so as to be arranged in a substantially balanced manner with each other. Is.

(Related Invention 2)
The present invention relates to the above-mentioned reinforcing bar holder and the reinforcing bar lifting device using the above-mentioned reinforcing bar holder, and the present invention also includes a method of constructing a reinforcing bar joint using them.
That is, a plurality of target reinforcing bars are arranged in a horizontal posture, and the lower end of each target reinforcing bar is in contact with the opening of the positioning cylinder and the lower end of each target reinforcing bar is in contact with the mounting depth regulation bottom. The outer circumference near the upper end of the target rebar so that the rebar lifting device suspended by the crane is guided to the target rebar placed in the horizontal position and one rebar holder is incorporated into one target rebar. While the holding ring is loosely fitted to the outer circumference, hold vise is temporarily connected to the outer periphery of the middle position of the target reinforcing bar, which is near the upper part of the reinforcing bar joint construction length range facing the opening of the positioning cylinder from the lower end of the target reinforcing bar. After incorporating the reinforcing bar holders in each of the target reinforcing bars of the book, the reinforcing bar lifting device and the multiple target reinforcing bars incorporated in it are lifted until they are in a hanging position, and the positioning cylinder is pulled out by its own weight and placed on the ground. In addition to being left behind, the outer circumference of multiple target reinforcing bars is bundled together, and the reinforcing bar lifting device and multiple target reinforcing bars are guided to the multiple lower reinforcing bars to be connected by a crane. To untie the target reinforcing bars of the book and make one target reinforcing bar correspond to one lower reinforcing bar, the lower end of the target reinforcing bar is abutted against the upper end of the lower reinforcing bar to construct the reinforcing bar joint or prepare for the construction of the reinforcing bar joint. One of them is performed, and after the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar are fixed, the temporary connection of the hold vise is released, and the reinforcing bar lifting device is pulled up and detached by the crane, which is the basis of the present invention. This is a method of constructing a reinforcing bar joint using a reinforcing bar lifting device using a reinforcing bar holder.

More specifically, the method of constructing the reinforcing bar joint of the present invention shows that a plurality of target reinforcing bars are arranged in a horizontal posture, and a positioning cylinder is placed from the opening of each target reinforcing bar with respect to the lower end of each target reinforcing bar. Exterior to the depth where the lower end of each reinforcing bar contacts the mounting depth regulation bottom, guide the reinforcing bar lifting device suspended by the crane to the target reinforcing bar placed in the horizontal posture, and one for each target reinforcing bar. In order to incorporate the reinforcing bar holder of, the holding ring is loosely fitted around the outer circumference near the upper end of the target reinforcing bar, and the target is located directly above the reinforcing bar joint construction length range facing the opening of the positioning cylinder from the lower end of the target reinforcing bar. Temporarily connect the hold vise around the outside of the middle position of the reinforcing bar, install the reinforcing bar holder in each of the multiple target reinforcing bars, and then use the crane to lift the reinforcing bar and the multiple target reinforcing bars incorporated in the hanging posture. The positioning cylinder was pulled out by its own weight and left on the ground, and the outer circumferences of multiple target reinforcing bars were bundled together, and the lower ends of multiple target reinforcing bars were covered with a cover bucket. , Connect the hanging part of the cover bucket near the lower end of the hanging rope, transport it to the vicinity of multiple lower reinforcing bars to be connected by a crane, and connect the reinforcing bar lifting device and multiple target reinforcing bars to the interlaced rope of the cover bucket. Guide to the top of multiple lower rebars to be connected using, remove the hanging part from the lower end of the hanging cord, remove the cover bucket, untie the multiple target rebars, and under one. In order to make one target reinforcing bar correspond to the reinforcing bar, the lower end of the target reinforcing bar is concentrically abutted against the upper end of the lower reinforcing bar, and a pressure welding device is installed between the vicinity of the upper end of the lower reinforcing bar and the vicinity of the lower end of the target reinforcing bar to form a reinforcing bar joint. After preparing for construction and fixing the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar, the temporary connection of the hold vise is released, the reinforcing bar lifting device is pulled up and detached by the crane, and the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar are used. Reinforcing bar joint using a rebar lifting device using a rebar holder, which is the basis of the present invention, in which heating from the outside by a burner and axial butt pressure by a pressure welding device are applied during gas pressure welding. It becomes the construction method of.

As described above, according to the reinforcing bar holder of the present invention, unlike the conventional ones, due to the unique characteristic configuration as described above, the reinforcing bar holder is located near the lower end of the target reinforcing bar and directly above the reinforcing bar joint construction length range. Since the hold vise can be detachably and temporarily connected around the outside of the middle position of the target reinforcing bar, and the holding ring is loosely fitted near the upper end of the target reinforcing bar, the target reinforcing bar is vertically attached to the crane. It can be hung reliably in the posture and can be safely transported by crane in the vertical posture. Furthermore, the hold vise is temporarily connected from the lower end of the target reinforcing bar to the middle position of the target reinforcing bar avoiding the range of the reinforcing bar joint construction length. Therefore, when constructing the reinforcing bar joint, the hold vise does not interfere with the work, and the holding vise remains at the work position near the lower end of the target reinforcing bar by the reinforcing bar joint construction worker. Because it can be removed, the work efficiency of the rebar joint construction work can be significantly improved, the number of steps can be significantly reduced, the work safety can be improved, and the number of workers required for the work can be reduced. It will show its characteristics.

In addition, the holding ring is composed of an inner diameter that is loosely fitted to the target reinforcing bar and a cylinder having a length of 20 cm to 100 cm, and can be connected to the outer peripheral wall of the cylinder in the middle of the suspension line. According to the rebar holder provided with a holding position adjustment mechanism that can adjust the distance from the hold vise at the lower end of the hanging cord to the holding ring, if there is no holding position adjustment mechanism, it is dedicated to the target reinforcing bar of a certain length. It becomes a reinforcing bar holder with the distance from the hold vise to the holding ring set, and depending on the difference in the length of the target reinforcing bar, for example, the reinforcing bar holder for 3 m or 4 m must be replaced, but the holding position adjustment mechanism Regardless of the length of the target reinforcing bar, the reinforcing bar holder provided with adjusts the distance from the hold vise to the holding ring according to the length of the target reinforcing bar, and the upper end of the target reinforcing bar protruding upward from the upper end of the holding ring. Since it is possible to keep the exposed length constant, it is not necessary to replace the reinforcing bar holder according to the length of the target reinforcing bar, and the work efficiency can be further improved.

When the hanging cord is hung linearly, the distance from the lower end of the holding ring to the hold vise is from the total length of the target reinforcing bar to the reinforcing bar joint construction length range, the length between the upper and lower ends of the holding ring, and the holding ring. According to the reinforcing bar holder set to the linear distance minus the total length of the exposed upper end of the target reinforcing bar protruding upward from the upper end, or in other words, when the hanging cord is hung in a straight line. , The length of the suspension cord from the lower end of the holding ring to the hold vise is the range from the total length of the target reinforcing bar to the reinforcing bar joint construction length range, the length between the upper and lower ends of the holding ring, and the object protruding upward from the upper end of the holding ring. According to the reinforcing bar holder set to the length obtained by subtracting the total length of the upper end exposed length of the reinforcing bar, the upper end exposed length of the target reinforcing bar when suspended from the reinforcing bar holder is kept constant from the upper end of the holding ring. It can be set, and the vertical posture of the target reinforcing bar can be more stabilized during lifting and transportation.

The reinforcing bar holder is a tubular type having an opening in the target reinforcing bar from which the lower end of the target reinforcing bar can be freely fitted, and a positioning cylinder having a mounting depth regulation bottom at a position from the opening to the reinforcing bar joint construction length. In the case of a combination of different rebar holders that are not connected to the hanging cord so that one rebar holder corresponds to one rebar holder, the positioning cylinder is located at the lower end of the target rebar before mounting the rebar holder. By installing, it is possible to accurately and evenly determine the temporary connection position of the hold vise with respect to the target reinforcing bar at a more suitable position that does not move too close to the lower end or the upper end of the target reinforcing bar. In addition to being able to stabilize the vertical posture during lifting, the hold vise does not interfere with the reinforcing bar joint, and it is possible to ensure remarkably smooth workability of the reinforcing bar joint.

According to the reinforcing bar lifting device using the reinforcing bar holder of the present invention, a plurality of reinforcing bar holders are provided on at least two hanging lower portions separated from each other with respect to a balance having a balance frame provided with a plurality of hanging lower portions. Since each of them is suspended so that they are arranged in a substantially balanced manner, it is possible to safely and efficiently transport multiple target reinforcing bars in a vertical position by lifting them once with a crane. By transporting the target reinforcing bars one by one, the reciprocating movement of the crane can be significantly reduced compared to the work in which the reinforcing bar joints were constructed, and the work efficiency can be greatly improved. This is because the rebar joint worker who constructed the rebar joint of the target rebar of the book can easily perform the detachment work (of the hold vise) of multiple rebar holders without leaving the place. , The series of work of the construction of the reinforcing bar joint can be improved more smoothly and quickly and significantly.

Furthermore, it is made of a soft material that can surround the lower end of the target reinforcing bar and the outer circumference near the lower end of the target reinforcing bar at the appropriate place near the lower end of any one of the reinforcing bar holders provided. A cover bucket that has a hanging portion that is detachably connected to a suitable position near the lower end of the hanging rope and has a rebar hanging at an appropriate position in the bag body having the hanging portion. According to the rebar lifting device that is detachably combined, it prevents the exposure of the lower ends of multiple suspended target rebars and the contact and cushioning of the exposed lower end surfaces of the target rebars with other objects, and prevents the rebar joints from being exposed. For construction, the lower end surface of the target reinforcing bar finished on a flat surface can be protected, the construction quality of the reinforcing bar joint can be maintained at high quality, and multiple target reinforcing bars can be bundled together to form multiple reinforcing bars. It is possible to prevent the stability of transportation by the crane from deteriorating due to the target reinforcing bars swinging or rotating individually, and to further improve work safety.

According to the method of constructing a reinforcing bar joint using the reinforcing bar lifting device of the present invention, the outer circumference near the upper end of the target reinforcing bar is utilized by utilizing the unique features of the reinforcing bar holder which is the basis of the present invention and the reinforcing bar lifting device using the same. The holding ring is loosely fitted to the outer circumference, and the hold vise is temporarily connected from the lower end of the target reinforcing bar to the outer periphery of the middle position of the target reinforcing bar, which is near the area directly above the reinforcing bar joint construction length range, and is quickly and safely used by the crane. Since it is lifted in a vertical position and multiple target reinforcing bars are bundled and transported at once, multiple target reinforcing bars can be easily transported by transporting to one crane, and moreover, multiple target reinforcing bars can be transported. Guide the target reinforcing bar to the top of multiple lower reinforcing bars to be connected, untie the multiple target reinforcing bars, and make the target reinforcing bar correspond to one target reinforcing bar at the upper end of the lower reinforcing bar. After abutting the lower ends of the reinforcing bars and either constructing the reinforcing bar joints or preparing for the construction of the reinforcing bar joints, the upper ends of the lower reinforcing bars and the lower ends of the target reinforcing bars are fixed, and then the temporary connection of the hold vise of the reinforcing bar holder is released. By pulling up and detaching the reinforcing bar lifting device with a crane, the place where the reinforcing bar joint is installed near the lower end of the target reinforcing bar and the place where the reinforcing bar is separated from the crane near the upper end of the target reinforcing bar are Although there was a difference in height between the top and bottom of one of the target rebars, the same worker could release the hold vise near the lower end of the target rebar while staying at the construction site of the rebar joint. The work of detaching from the reinforcing bar lifting device can be made much more efficient, and the excellent effect of reducing the number of workers and the number of manpower can be achieved.

In addition, multiple target reinforcing bars are placed in a horizontal position so that one positioning cylinder for each target reinforcing bar covers the lower end of the target reinforcing bar from the opening to the depth where it abuts on the mounting depth regulation bottom. As a result, it is possible to temporarily connect the hold vise from the lower end of the target reinforcing bar to the outer periphery of the middle position of the target reinforcing bar near the opening of the positioning cylinder near the position directly above the reinforcing bar joint construction length range, and for multiple target reinforcing bars. The temporary connection position of the hold vise can be stabilized evenly, safer crane transportation is possible, and the reinforcing bar lifting device by the crane and the multiple target reinforcing bars incorporated in it are placed in the hanging posture. The positioning cylinder was pulled out by its own weight and left on the ground, and the outer circumference of multiple target reinforcing bars was bundled together, and the cover bucket covered the lower ends of multiple target reinforcing bars. By covering with and connecting the hanging part of the cover bucket to the appropriate place near the lower end of the hanging cable, the packing shape of multiple target reinforcing bars is stabilized, the lower end surface of the target reinforcing bar is protected, and the reinforcing bar is reinforced. Since the construction quality of the joint can be stabilized to high quality and the range of the reinforcement joint construction length is secured from the lower end of the target reinforcing bar to the hold vise, there is no problem near the upper end of the lower reinforcing bar and near the lower end of the target reinforcing bar. The pressure welding device is smoothly incorporated between the and, and the preparation for the construction of the reinforcing bar joint is performed efficiently, and the worker who prepared the construction of the reinforcing bar joint does not move, and the temporary connection of the hold vise is promptly performed while being there. By unraveling, the reinforcing bar lifting device can be pulled up and detached by the crane, and the subsequent gas pressure welding work by the burner can be performed quickly and efficiently.

In carrying out the present invention having the above-described configuration, the best or desirable form thereof will be described.
The rebar holder allows the crane to hang a single target rebar in a vertical position, and the target rebar is connected and detached at a position near the lower end of the target rebar suspended in the vertical position. A suspension bar having a connecting part to which a crane is connected to a wrinkle, a hold vise provided at the lower end of the hanging line, and a middle part of the hanging line. It must have a holding ring, and more specifically, as shown in Examples described later, it is a tubular shape having an opening in the target reinforcing bar from which the lower end of the target reinforcing bar can be freely fitted. Therefore, the positioning cylinder having a mounting depth regulation bottom at the position where the length of the reinforcing bar joint is constructed from the opening is not connected to the suspension cord so that one positioning cylinder corresponds to one reinforcing bar holder. It is desirable to combine them as things.

The suspension rope has the function of connecting the hold vise and the holding ring to the height positions set between the upper and lower ends of the suspension rope suspended from the upper end of the crane, and safely secures the target reinforcing bar. In the case of the rebar holder incorporated in the rebar lifting device of the present invention, it shall be strong enough to be lifted and shall have a connecting part at the upper end of the rope to which the crane is attached to the wrinkle. The upper end of the rope is attached to the hanging part of the balance frame of the balance, and the rope is the outside of the wire rope, the chain, the reinforcing bar, the rope, and other similarly usable lines. It is possible to replace it with parts regardless of whether it is soft or hard, and as shown in the examples described later, for example, the holding ring is assumed to have a bracket on the outer periphery of the cylinder, and the suspension rope is in the middle. The upper and lower range corresponding to the bracket of the holding ring of the portion is divided into upper and lower parts so as to be replaceable with the bracket, and the corresponding upper and lower ends of the bracket are connected between the upper and lower divided ends of the middle part of the hanging rope. It is possible that the space between the halfway break ends of the hanging rope is replaced by the bracket.

The connecting portion of the hanging rope has a function of making the hanging rope connected to the crane, and in the case of the reinforcing bar holder incorporated in the reinforcing bar lifting device of the present invention, the balance It has the function of being connected to the hanging lower part of the balance frame, and is attached to either the crane or the hanging lower part of the balance frame, either detachable or non-detachable. It must be, and it is possible to provide connecting metal fittings such as hooks and shackles at the upper end of the cord, as well as ice price and ring as shown in the examples described later. It can be said that it is desirable to combine a hook, a shackle, etc. with a ring containing thimble (anti-compression processing).

The hold vise shares the function of allowing the lower end of the hanging rope to be detachably and temporarily connected to the part near the lower end of the target reinforcing bar so that the target reinforcing bar can be safely held with sufficient strength. It must be possible to temporarily connect to the lower end of the strip from the lower end of the target reinforcing bar to the periphery outside the middle position of the target reinforcing bar, which is near the area directly above the reinforcing bar joint construction length range, from the lower end of the target reinforcing bar. , Reinforcing bar joint construction length range can be confirmed by eye measurement, by using rulers, winding scales, gauges, etc., by using a positioning cylinder. The hold vise does not need to be inserted or removed from the lower end of the target reinforcing bar, and can be freely attached to and detached from the outer peripheral wall in the middle of the target reinforcing bar. , Or can be tightened, and as in the embodiment described later, the target reinforcing bar has a vise part and a tightening piece with respect to the lifting part connected to the lower end of the hanging rope. A tightening mechanism that can be temporarily connected may be provided on the outer peripheral wall of the middle portion.

The holding ring is loosely fitted near the upper end of the target reinforcing bar, and when the middle part near the lower end is temporarily connected to the hold vise, the middle part near the upper end of the target reinforcing bar cannot be rolled over / detached and can be held detachably. It is assumed that at least one is provided in the middle of the suspension line facing the upper end of the target reinforcing bar when it is temporarily connected to the hold vise so as to loosely fit toward the upper end of the target reinforcing bar. Must consist of one ring with an inner diameter that can be loosely fitted to the target reinforcing bar, or a plurality of rings with an inner diameter that can be loosely fitted to the target reinforcing bar, or loosely fitted to the target reinforcing bar. In addition to being able to consist of a cylinder with a possible inner diameter, as shown in the examples described later, from an inner diameter that loosely fits into the target reinforcing bar and a cylinder having a length of 200 mm to 1,000 mm. Therefore, the outer peripheral wall of the tubular body is provided with a holding position adjusting mechanism that can be connected to the middle part of the hanging rope and can adjust the distance from the hold vise at the lower end of the hanging rope to the holding ring. The holding position adjusting mechanism has a function of adjusting the vertical position of the holding ring between the upper and lower ends of the hanging rope, and is bolted to the middle position of the hanging rope. It can be temporarily fixed with a nut, and can be moved up and down by loosening the bolts and nuts. With an intervening intervening device, such as a winder that can be temporarily fixed by hoisting and rewinding the divided end (upper end) of the lower rebar and adjusting the length of the lower rebar. It is possible to do.

For the positioning cylinder, accurately confirm the mounting position of the hold vise, which is detachably and temporarily connected to the outer circumference of the target reinforcing bar, which is near the upper part of the target reinforcing bar construction length range from the lower end of the target reinforcing bar. In addition to making it possible, the lower end surface of the target reinforcing bar that is lifted from the ground and the lower end of the target reinforcing bar have the function of protecting the outer peripheral wall of the wall from damage caused by trauma and dust. It must be a free-bottomed tubular type that can be loosely fitted from the inside, and more specifically, it is a tubular type that has an opening that allows the lower end of the target reinforcing bar to be loosely fitted to the target reinforcing bar. A positioning cylinder with a mounting depth regulation bottom at the position where it will be the construction length is combined as a separate body that is not connected to the hanging cord so that one positioning cylinder corresponds to one reinforcing bar holder. As shown in the examples described later, it is assumed that the positioning cylinder has an outer peripheral wall having a polygonal cross-sectional shape such as a quadrangular shape that is difficult to roll around the axis, and the mounting depth regulation bottom is the positioning cylinder. Inside the interior of the rebar, a single-character rebar arranged to penetrate in the radial direction, two rebars crossed in a cross-sectional direction in the cross section, or the inner wall of the positioning cylinder near the proximal end. It is preferably made of any of the pipe bodies, etc., and it is desirable to have a handle for carrying around the outer circumference near the opening at the tip.

The rebar joint construction length range is from the lower end of the target rebar to the midway position of the target rebar required for rebar joint construction, and although the length range varies depending on the type of rebar joint, it is from the lower end of the target rebar. It is possible to set the range to approximately 100 mm to 1,000 mm up to the midway position, and as shown in the examples described later, secure 300 mm to 500 mm when constructing a reinforcing bar joint by gas pressure welding. It can be said that it is desirable to do so.

The cover bucket shares the function of protecting the lower end surfaces of the plurality of target reinforcing bars lifted by the reinforcing bar lifting device of the present invention and the vicinity of the lower ends from external interference and contamination, and the lower ends of the plurality of target reinforcing bars and the lower ends. It is a bag made of a soft material that can surround the outer circumference of the plurality of target reinforcing bars near the lower end, and has a hanging portion that can be detachably connected to a suitable place near the lower end of the hanging reinforcing bar. It must be detachably combined with any one of the holders near the lower end of the hanging rope, and the interstitial rope is hung at the right place on the bag body with the hanging part. The bag should be made of a material that is durable enough to withstand repeated contact with the target rebar and has a cushioning property that can protect the lower end of the target rebar. For example, it can be made of canvas cloth, natural rubber, soft plastic, hard plastic, wooden, or a composite material thereof. It is desirable that a weight for preventing runout and rotation is provided at an appropriate place such as a wearing part.

The balance is arranged so that the plurality of reinforcing bar holders are arranged in a substantially balanced manner with respect to the reinforcing bar lifting device of the present invention suspended from the hook of the crane, at least at two positions separated by horizontal intervals. It must share the function of being suspended, have a balance frame with multiple suspensions separated by horizontal spacing, and be capable of being suspended on the hook of a crane. The balance frame is capable of integrally supporting a plurality of hanging portions separated in the horizontal direction, and as shown in Examples described later, is a horizontal rod-shaped one-character shape in a plan view having a rectangular cross-sectional shape. Outside, the horizontal shape is a ring shape such as a cross, a circle, an ellipse, a rectangle, a rhombus, a star, a cross, a polygon, or, for example, the horizontal shape is A, B, C, D, E, F, G, H, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, Y, Z-shaped frame The lower part of the suspension has a function of enabling the reinforcing bar holder to be connected with sufficient strength, and is suspended from a reinforcing bar holder suspended so as to be adjacent in the horizontal direction or a reinforcing bar holder. It must be possible to prevent the target reinforcing bars from interfering unnecessarily, and it must be provided at intervals that do not support the construction of the reinforcing bar joints, and multiple suspension portions must be provided with a height difference between the top and bottom of each other. The balance cord was hung from the master link in an inverted V shape, and a horizontal spacing was provided between the lower ends of the balance cord, as shown in Examples described later. When both ends of the balance frame provided with multiple suspensions are connected to each other and the master link is suspended on the hook of the crane, the balance frame is lifted horizontally, and the reinforcing bar holder of the present invention is attached to the suspension. It is better to be suspended.

The target reinforcing bar can be said to be a steel rod for construction, and more specifically, it can be a deformed steel bar, round steel, etc., but it is not limited to steel bars, and any rod-shaped material or outer wall can be used. Regardless of the uneven shape, any material such as wooden rods, columns, concrete columns, etc. can be replaced with the target reinforcing bar.

The method for constructing a reinforcing bar joint of the present invention is a technique for constructing a reinforcing bar joint using the reinforcing bar lifting device of the present invention, and when a slinging worker arranges a plurality of target reinforcing bars in a horizontal posture, It is desirable that both ends of the target reinforcing bar are placed in a state where they are slightly floating from the ground without touching the ground, such as by laying a square material under the middle part near both ends of the target reinforcing bar. When incorporating into the target reinforcing bar of the book, the holding ring is externally fitted around the outer circumference near the upper end of the target reinforcing bar before the hold vise, and after the holding ring is attached, the hold vise is inserted from the lower end of the target reinforcing bar. , Reinforcing bar joint construction It is necessary to temporarily connect to the outer periphery of the middle position of the target reinforcing bar near the top of the construction length range, and in order to more accurately determine the temporary connecting position of the hold vise, the target reinforcing bar Insert the positioning cylinder into the bottom of the mounting depth regulation, which is the length of the reinforcing bar joint construction, from the opening of the lower end of the target reinforcing bar until the lower end surface of the target reinforcing bar reaches, and then insert the positioning cylinder of the target reinforcing bar exposed near the opening of the positioning cylinder. It can be said that it is desirable to temporarily connect the hold vise to the periphery outside the midway position.

The crane operator lifts the reinforcing bar lifting device and the multiple target reinforcing bars incorporated in it by the crane until they are in a hanging position, and the slinging worker binds the outer circumferences of the multiple target reinforcing bars together. In some cases, as shown in the examples described later, it is possible for the slinging worker to bind using an annealed iron wire, and although not shown in the examples described later, It is possible to use synthetic resin belts, leather belts, binding strings made of various materials, rubber belts, metal belts, and various other binding strings and bands, which are also shown in Examples described later. As a result, the slinging worker covers the lower ends of the plurality of bound target reinforcing bars with a cover bucket, and connects the hanging part of the cover bucket to a suitable place near the lower end of the hanging cord, and later the reinforcing bar joint. It is desirable to protect the lower end of the target reinforcing bar to be constructed from stains.

In addition, the reinforcing bar lifting device and the multiple target reinforcing bars transported by the crane operator to the vicinity of the multiple lower reinforcing bars to be connected by the crane are used for reinforcing bar joint work so as to prevent unnecessary movements such as runout and rotation in the air. It is desirable for the personnel to guide them to the top of multiple lower reinforcing bars to be connected by using the interstitial rope of the cover bucket, and after transportation, the suspension part is separated from the appropriate place near the lower end of the suspension cord and the cover is covered. The bucket is removed, the binding of a plurality of target reinforcing bars is untied, and as shown in the examples described later, the lower end of the target reinforcing bar is located at the upper end of the lower reinforcing bar so that one target reinforcing bar corresponds to one lower reinforcing bar. Can be concentrically abutted and a pressure welding device can be installed between the vicinity of the upper end of the lower reinforcing bar and the vicinity of the lower end of the target reinforcing bar to prepare for the construction of the reinforcing bar joint. In addition to the preparation for gas pressure welding, either welding joints, mechanical joints, etc., or temporary fixing before construction can be performed.

In addition, the reinforcing bar joint worker removes the cover bucket from the reinforcing bar lifting device and the plurality of target reinforcing bars transported by the crane operator to the vicinity of the plurality of lower reinforcing bars to be connected by the crane, and binds the multiple target reinforcing bars. In order to make one target reinforcing bar correspond to one lower reinforcing bar, the bundle length range of the upper end of the lower reinforcing bar is overlapped in parallel with the bundle length range of the lower end of the target reinforcing bar, and the construction or construction of the lap joint is performed. Any of the previous temporary fixings can be done.

After the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar are fixed, the reinforcing bar joint worker who has performed at least one of the construction of the reinforcing bar joint and the preparation for the construction of the reinforcing bar joint moves while keeping the working position. Instead, the crane operator who released the temporary connection of the hold vise and confirmed the release of the hold vise can pull up the reinforcing bar lifting device by the crane so that it can be quickly released, and then the reinforcing bar joint work incorporating the pressure welding device. The member can smoothly press and contact the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar (upper reinforcing bar).
Hereinafter, the structure thereof will be described in detail together with examples representing the present invention shown in the drawings.

The drawings show some typical examples that embody the technical idea of the reinforcing bar holder of the present invention, the reinforcing bar lifting device using the reinforcing bar holder, and the construction method of the reinforcing bar joint.
It is a front view which shows the reinforcing bar lifting device. It is a front view which shows the balance. It is a top view which shows a part of the balance. It is a front view which shows the balance frame of the balance. It is a three-sided view showing a hold vise. It is a three-view view which shows the holding ring. It is a three-view view which shows the holding ring which has a holding position adjustment mechanism. It is a three-view view which shows the positioning cylinder. It is a front view which shows the reinforcing bar lifting device which suspended the target reinforcing bar. It is a front view which shows the reinforcing bar lifting device equipped with a cover bucket. It is a front view which includes the partial perspective view which shows the reinforcing bar lifting device which separated the hold vise. It is a front view including a partial perspective view which shows the gas pressure welding work state. It is a flowchart which shows the construction method of a reinforcing bar joint. It is a flowchart which shows the construction method of the reinforced joint which further improved.

In the example shown in FIGS. 1 to 11, the balance frame 22 provided with a plurality of hanging lower portions 23 is provided, and the balance 2 capable of being suspended is provided on the hook of the crane, and the balance is provided at the upper end of the cord 4. A hanging rope 4 having a connecting portion 40 connected to the hanging lower portion 22 of 2 is provided, and at the lower end of the hanging rope 4, from the lower end of the target reinforcing bar SB to the vicinity directly above the reinforcing bar joint construction length range L0. A hold vise 5 that can be detachably temporarily connected is provided around the outside of the middle position of the target reinforcing bar SB, and is temporarily connected to the hold vise 5 from the lower end of the suspension rope 4 provided with the hold vise 5. A plurality of reinforcing bar holders 3 provided with at least one holding ring 6 loosely fitted near the upper end of the target reinforcing bar SB in the middle of the suspension line 4 facing the upper end of the target reinforcing bar SB in the case. Reinforcing bar lifting using the reinforcing bar holder of the present invention is such that the balance frame 22 of the balance 2 is suspended from each of at least two hanging lower portions 23 separated from each other so as to be arranged in a substantially balanced manner with each other. A typical embodiment of the apparatus is shown.
Hereinafter, the structure of the reinforcing bar holder 3 which is the basis of the present invention will be shown first, and then the structure of the reinforcing bar lifting device 1 of the present invention will be shown, and further, in the item of action / effect of the present invention, the present invention will be shown. The construction method of the reinforcing bar joint using the reinforcing bar lifting device 1 of the above will be sequentially shown.

As can be clearly understood from each of these figures, the reinforcing bar holder 3 of the present invention has an upper rope 41 and a lower rope whose suspension rope 4 is composed of two upper and lower wire ropes having a diameter of 12 mm, which are processed to prevent compression at both ends. It is made of a strip 42, and the annular end at the upper end of the upper rope strip 41 becomes a connecting portion 40 connected to the hanging lower portion 23 of the balance frame 22 of the balance 2 in which the crane serves as a shackle. A hold vise 5 is provided at the annular end of the lower end of the lower cord 42, and as shown in FIG. 5, the hold vise 5 is connected to the annular end of the lower end of the lower cord 42 via a shackle. Approximately C, which has a tongue-shaped lifting portion 50 formed so that a hole penetrates in the plate thickness direction, is integrated with the lifting portion 50, and has an opening capable of passing through the outer diameter of the target reinforcing bar SB. A vise portion 52 having a short tubular shape with a cross-sectional shape is provided, and a bolt-made tightening piece 53 screwed in a radial direction is incorporated into the peripheral wall near the opening of the vise portion 52. It is supposed to have a tightening mechanism 51 including a tightening piece 53, and the bolt tip portion that abuts on the target reinforcing bar SB of the tightening piece 53 abuts on the target reinforcing bar SB even when the bolt head rotates. A joint 54 that can idle around the axis of the bolt is provided so that the portion does not rotate, and when tightened, the outer peripheral wall of the target reinforcing bar SB is not damaged unnecessarily. It is possible to replace the bolt tip portion with a flat surface shape perpendicular to the bolt axis or a bolt tip portion having a spherical shape.

As shown in FIG. 6, the upper end of the holding ring 6 is connected to the annular end of the lower end of the upper rope 41 of the hanging rope 4 via a shackle, and the lower end of the holding ring 6 is attached to the shackle. It is assumed that the annular end of the upper end of the lower cord 42 of the suspension cord 4 is connected via the holding ring 6, and the holding ring 6 has an inner diameter that is loosely fitted to the target reinforcing bar SB (for example, the outer diameter of the target reinforcing bar SB is 16 mm). In the case of, the inner diameter of the holding ring 6 can be 27.6 mm), and the cylinder 60 having a length of 200 mm to 1,000 mm is formed on the outer peripheral wall of the cylinder 60 in the centrifugal direction. A bracket 61, which has a length of 100 mm to 900 mm and is set to be retracted by about 50 mm (shackle size) at both ends closer to the center than both ends of the cylinder 60, is projected. Connecting holes 62 and 62 for connecting shackles are bored near the upper and lower ends of the bracket 61, respectively. The annular end is connected via a shackle, and the annular end at the upper end of the lower cord 42 is connected to the connecting hole 62 at the lower end of the bracket 61 via the shackle.

The length L1 of the lower cord 42 of the suspension cord 4 is such that the hold vise at the lower end of the lower cord 42 is directly above the reinforcement joint construction length range L0 (about 300 mm to 500 mm) from the lower end of the target reinforcing bar SB. When the target reinforcing bar is temporarily connected to the outer periphery of the midway position of the target reinforcing bar, the holding ring 6 arranged and connected between the lower end of the upper cord 41 and the upper end of the lower cord 42 is the target reinforcing bar. The dimensions are set so that they are loosely fitted in the middle part near the upper end of the SB (the position where the lower end is about 500 mm from the upper end of the target reinforcing bar SB), in other words, from the total length L of the target reinforcing bar SB. It is desirable that the length is set to L1 minus about 1,000 mm.

Further, if the expression is changed, the distance from the lower end of the holding ring 6 to the hold vise 5 when the lower cord 42 is linear is obtained by subtracting about 1,000 mm from the total length L of the target reinforcing bar SB. It is better to set the length to L1, and further, the hold vise 5 is temporarily connected to the same object at the middle position near the upper end of the reinforcing bar joint construction length range L0 (about 300 mm to 500 mm). The length L1 of the lower cord 42 is set in the reinforcing bar SB so that the lower end of the holding ring 6 has a corresponding arrangement relationship at an intermediate position 500 mm from the upper end of the target reinforcing bar SB and near the lower end of the target reinforcing bar SB. For example, when the total length L of the target reinforcing bar SB is 4,500 mm, the length L1 of the lower cord 42 is preferably about 3,500 mm, and the total length of the target reinforcing bar SB is set to about 3,500 mm. When L is 4,500 mm, it is preferable that the distance from the lower end of the holding ring 6 to the hold vise 5 is set to about 3,500 mm.

Further, referring to FIG. 9, in another expression, the distance L1 from the lower end of the holding ring 6 to the hold vise 5 when the hanging cord 4 (41, 42) is hung in a straight line is the target. From the total length L of the reinforcing bar SB, the total length (L0 + L2 + L3) of the reinforcing bar joint construction length range L0, the length between the upper and lower ends of the holding ring 6, and the upper end exposed length L3 of the target reinforcing bar SB projecting upward from the upper end of the holding ring 6. It is better to set the linear distance L1 by subtracting The length L1 of the suspension rope 4 (42) up to the hold vise 6 is from the total length L of the target reinforcing bar SB to the reinforcing bar joint construction length range L0, the length between the upper and lower ends of the holding ring 6, L2, and the upper end of the holding ring 6. It can be said that it is better to set the length L1 by subtracting the total length (L0 + L2 + L3) of the upper end exposed length L3 of the target reinforcing bar SB protruding upward from the above.

As shown in FIG. 7, in the holding ring 6, the bracket 61 can be replaced with the holding position adjusting mechanism 63, and the holding position adjusting mechanism 63 has the suspension bolt 4 on the upper part. It is not divided into a cord 41 and a lower cord 42, and is composed of a single wire rope continuous from the connecting portion 40 at the upper end to the lower end provided with the hold vise 5, and the holding ring 6 is composed of a single wire rope. The suspension bolt 4 can be freely moved and temporarily fixed to the middle portion of the suspension bolt 4 via the holding position adjusting mechanism 63. For example, the cylinder 60 of the holding ring 6 can be moved and temporarily fixed. A main flange 64, which has a rectangular flat plate shape and has a vertical groove 65 engraved to fit a part of the outer circumference of the suspension cable 4, is erected parallel to the axial direction of the cylinder 60. A facing flange 66 parallel to the axial direction of the cylinder 60 is erected so as to face the main flange 64 and the vertical groove 65 at a distance, and the center between both ends of the facing flange 66 and both ends. Each includes a female screw hole corresponding to the vertical groove 65 and a bolt 67 screwed into the female screw hole, and is fitted to a part of the outer periphery of the suspension rope 4 at the tip of the bolt 67. Holding bolts 67, 67, 67 having holding grooves and holding holding pieces 68 axially attached on the axis of the bolt 67 so as not to rotate even when the bolt rotates are provided, and the vertical length of the main flange 64 is provided. The middle part of the hanging cable 4 is sandwiched between the groove 65 and the holding pieces 68, 68, 68 of the holding bolts 67, 67, 67, and the holding ring 6 is moved and adjusted in the length direction of the hanging line 4. In addition, the holding bolts 67, 67, 67 are tightened, and the holding ring 6 is positioned and temporarily fixed to the suspension cord 4.

As shown in FIG. 8, the positioning cylinder 7 is made of a steel pipe having a total length of 500 mm and having a square opening 70 having a side of 50 mm that can be loosely fitted to the target reinforcing bar SB from the lower end of the target reinforcing bar SB. It has a mounting depth regulation bottom 71 at either the position of the cage length LS (300 mm), which is the same as or slightly shallower than the reinforcing bar joint construction length L0 (300 mm to 500 mm) from 70, and is attached to the suspension line 4. As a separate body that is not connected, it is provided so that it is a combination of one reinforcing bar holder 3, and a steel rod is bent in a U shape on at least one side wall of the outer peripheral wall near the opening 70. It is assumed that the handle 74 is integrated by welding both ends of the handle 74, and as shown in FIG. 8A, the mounting depth regulation bottom 71 has a reinforcing bar joint construction length from the opening 70. It is penetrated from the center of the outer wall width of either the same as L0 (300 mm to 500 mm) or a position of the cage length LS (300 mm) slightly shallower to the center of the opposite outer wall width. One regulated steel rod 72 whose ends are fixed by welding and one regulated steel rod that is similarly welded and arranged to intersect in a cross shape in a plan view so as to be joined directly under the regulated steel rod 72 . The positioning tube 7 consists of 72, and thus can consist of a total of two regulated steel bars 72, 72 crossed in a cross, as shown in FIG. 8 (b). The mounting depth regulation bottom 71 is in the L-shaped cross section of either the same position as the reinforcing bar joint construction length L0 (300 mm to 500 mm) from the opening 70 or the position of the cage length LS (300 mm) slightly shallower than that. A regulation pipe 73 made of a circular steel pipe having a length extending from between adjacent inner walls to the vicinity of the base end of the ridge opposite to the opening 70 and having an outer diameter of about ½ of the outer wall width of the positioning cylinder 7 is welded. Can be combined by.

(Action / effect of Example 1)
As shown in FIGS. 1 to 6 and FIGS. 8 to 13 (see only one reinforcing bar holder 3 excluding the balance 2 in the figure), the reinforcing bar holder 3 of the present invention having the above configuration is shown. In addition, it can be used to construct a reinforcing bar joint, for example, to gas press contact the lower end of one target reinforcing bar SB, which is the upper reinforcing bar, to the upper end of one lower reinforcing bar UB. As shown in the flow chart, the slinging / reinforcing bar joint worker puts the target reinforcing bar SB whose end face has been finished for gas pressure welding on a pillow tree (not shown) on the ground so that the finished end face will not be soiled. Arranged in the horizontal posture (A), as shown in FIGS. 1 and 9, the slinging / reinforcing bar joint worker places the positioning cylinder 7 on one end (the lower end of the lifting vertical posture) of the target reinforcing bar SB that has been finished. After the lower end of the target reinforcing bar SB is exteriorized (B) from the opening 70 to the depth where it abuts on the mounting depth regulation bottom 71, the crane operator puts the hook (not shown) of the crane on the upper end of the hanging cable 4 The reinforcing bar holder 3 suspended via the connecting portion 40 of the above is guided (C) to the vicinity of the target reinforcing bar SB arranged in the horizontal posture, and the slinging worker holds the holding ring 6 in addition to the target reinforcing bar SB. The end (upper end of the lifting vertical posture) is loosely fitted (D), and the hold vise 5 is placed near the opening 70 of the positioning cylinder 7 which is directly above the reinforcing bar joint construction length range L0 from the lower end of the target reinforcing bar SB. Arranged around the outside of the midway position of the target reinforcing bar SB, the tightening piece 53 is tightened to temporarily connect (E). As shown in FIG. 5, when tightening the tightening piece 53 in the screwing direction, the joint 54 Is joined to the outer peripheral wall of the target reinforcing bar SB without rotation, so that it is possible to prevent unnecessary damage to the target reinforcing bar SB.

As shown in FIG. 9, when the crane operator lifts the reinforcing bar holder 3 and one target reinforcing bar SB incorporated in the reinforcing bar holder 3 by the crane until the target reinforcing bar SB is in the hanging posture, the crane operator suspends the reinforcing bar holder 3 and the upper reinforcing bar 41 of the hanging rope strip 4. The holding ring 6 is moved from the hold vise 5 to the position of the length L1 of the lower cord 42, and the protrusion amount of the upper end of the target reinforcing bar SB exposed upward from the upper end of the holding ring 6 is automatically the upper end exposed length. It becomes L3, and the positioning cylinder 7 is naturally removed (F) by its own weight and left on the ground, and the hold vise 5 ensures that the vicinity of the lower end of the target reinforcing bar SB (near directly above the reinforcing bar joint construction length range L0). The target reinforcing bar SB is held by the holding ring 6 gently (so that it can be removed when the temporary connection of the hold vise 5 is released) so that the upper end of the target reinforcing bar SB is not overturned. The operator transports the target reinforcing bar SB to the vicinity of the lower reinforcing bar UB to be connected (J) by the crane and the reinforcing bar holder 3 suspended from it, and the slinging / reinforcing bar joint worker who has been waiting at the reinforcing bar joint construction site is one. One target reinforcing bar SB is made to correspond to the lower reinforcing bar UB of the book (N), and the lower end of the target reinforcing bar SB is concentrically abutted against the upper end of the lower reinforcing bar UB (P). A pressure welding device PM is installed between the vicinity of the upper end of the UB and the lower end of the target reinforcing bar SB to prepare for the construction of the reinforcing bar joint (Q), and the upper end of the lower reinforcing bar UB and the lower end of the target reinforcing bar SB are fixed by the pressure welding device PM. After that, the temporary connection of the hold vise 5 is released (R), and the crane operator who receives the notification of the detachment from the slinging / reinforcing bar joint worker pulls up and detaches the holding ring 6 and the hold vise 5 by the crane. (S), as shown in FIG. 12, a reinforcing bar joint worker heats from the outer circumference by a burner BN between the upper end of the lower reinforcing bar UB and the lower end of the target reinforcing bar SB, and axially by the pressure welding device PM. It is possible to apply butt pressure and perform gas pressure contact, so the slinging / reinforcing bar joint worker at the reinforcing bar joint construction site can perform the reinforcing bar holder at the same location where the reinforcing bar joint is constructed without moving to a high place. It is possible to carry out the detaching work of 3 and the construction of the reinforcing bar joint one after another.

As shown in FIGS. 1 to 11, the reinforcing bar lifting device 1 of the present invention using the reinforcing bar holder 3 which is the basis of the present invention, which is shown in the first embodiment, has a plurality of suspending lower portions spaced apart in the horizontal direction. A balance 2 having a balance frame 22 provided with 23, 23, ... A suspension rope 4 having a connecting portion 40 is provided, and at the lower end of the suspension rope 4, the outer periphery of the middle position of the target reinforcing bar SB located immediately above the reinforcing bar joint construction length range L0 from the lower end of the target reinforcing bar SB. A hold vise 5 that can be temporarily connected to the hold vise 5 is provided on the sill, and faces the upper end of the target reinforcing bar SB when the hold vise 5 is temporarily connected to the hold vise 5 from the lower end of the suspension rope 4 provided with the hold vise 5. A plurality of reinforcing bar holders 3 provided with at least one holding ring 6 loosely fitted near the upper end of the target reinforcing bar SB in the middle of the hanging rope strip 4 are spaced apart from each other by the balance frame 21 of the balance 2. It is a typical embodiment of the reinforcing bar lifting device of the present invention, which is suspended so as to be arranged so as to be substantially balanced with each other at at least two suspension portions 23, 23 separated from each other. ..

As can be clearly understood from each of these figures, in the reinforcing bar lifting device 1 of the present invention, the balance 2 is made of a rectangular steel plate having a long width, and the balance 2 is made of a rectangular steel plate having a long width. The balance frame 22 is provided with hanging holes 23, 23, ... As a hanging lower portion 23 penetrating in the plate thickness direction, and a shackle is provided with respect to the hanging holes 23, 23 at the left and right ends of the balance frame 22. From the master link 20 connected to the hook of the crane via the above, hooks provided at the lower ends of the two hanging balance cords 21 and 21 are connected so as to form a two-point suspension wire, and the balance is connected. As shown in FIGS. 1, 2, 4, 9, and 10, with respect to the second hanging holes 23 and 23 from the left and right ends of the frame 22, there are two hanging holes 23 on either the left or right side. The connecting portion 40 at the upper end of the upper cord 41 of the suspension cord 4 of the three reinforcing bar holders 3, 3 and 3 is connected via a continuous shackle (two shackles) and one hook, and either left or right. The connecting portion 40 at the upper end of the upper cord 41 of the suspension cord 4 of the two reinforcing bar holders 3 and 3 is connected to the other suspension hole 23 via a double shackle (two shackles) and one hook. A total of five reinforcing bar holders 3, 3, ... Are suspended.

As shown in FIGS. 1 and 10, a cover bucket 8 is combined with the reinforcing bar lifting device 1 of the present invention, and the cover bucket 8 has a total of five suspended reinforcing bar holders 3, 3, .... Canvas, which is a soft material that can surround the lower end of the target reinforcing bar SB and the outer circumference near the lower end of the target reinforcing bar SB, in place near the lower end of the lower rope 42 of the hanging rope 4 of any one of the inside. A breech-bottomed cylindrical bag 8 made of fabric, in which a handle-shaped suspension band is bridged and connected to an opening edge facing the diameter direction of the bag body 8, and a shackle and a hook are connected to the suspension band. Therefore, it has a hanging part 80 that is detachably connected to a suitable place near the lower end of the lower rope 42 of the hanging rope 4, and also has a suitable place such as a hanging part 80 of the bag body 8 having the hanging part 80. A weight 82 capable of dampening the rotation and runout of the reinforcing bar lifting device 1 while the crane is moving is shackled at an appropriate position such as the hanging portion 80 of the cover bucket 8. And can be connected via hooks.

(Action / effect of Example 2)
As shown in FIGS. 1 to 6 and 8 to 13, the reinforcing bar lifting device 1 using the reinforcing bar holder 3 of the present invention having the above-mentioned configuration is the construction of the reinforcing bar joint, more specifically, the lower part. The lower end of the target reinforcing bar SB, which is the upper reinforcing bar, can be used for gas pressure welding to the upper end of the reinforcing bar UB, and the process will be described below with reference to the flowchart of FIG.

A total of five target reinforcing bars SB, SB, ..., whose end faces have been finished for gas pressure welding, are placed parallel to each other and at appropriate intervals on ground pillows (not shown) by slinging / reinforcing bar joint workers. Arranged in a horizontal posture so as to be adjacent to each other (A) so that one positioning cylinder 7 is mounted on each target reinforcing bar SB, and the lower end of the target reinforcing bar SB is from the opening 70 to the mounting depth regulation bottom 71. After making the exterior (B) to the depth of contact, the crane operator puts the reinforcing bar lifting device 1 suspended on the hook (not shown) of the crane into a plurality of target reinforcing bars SB arranged in a horizontal posture. , SB, .... (C), and as shown in FIG. 9, the slinging worker is located near the upper end of the target reinforcing bar SB so that the slinging worker incorporates one reinforcing bar holder 3 into one target reinforcing bar SB. The holding ring 6 is loosely fitted around the outer circumference (D), and the lower end of the target reinforcing bar SB is abutted against the gauge length LS from the mounting depth regulation bottom 71 to the opening 70 of the positioning cylinder 7. Temporarily connect (E) a hold vise 5 around the outside of the midway position of the target rebar that is near the long, rebar joint construction length range L 0 , and a total of five target rebar holders for each of the five target rebars SB, SB, ... After incorporating 3, 3, ..., when the crane operator lifts the reinforcing bar lifting device 1 until the target reinforcing bars SB, SB, ... are in the hanging posture, the positioning cylinders 7, 7, ... It will be left on the ground after being removed (F).

The slinging worker bundles the outer circumference of the five target reinforcing bars SB, SB, ... Then, as shown in FIG. 10, the cover bucket 8 is attached so as to cover the lower ends of the five bundled target reinforcing bars SB, SB, ..., And the hanging portion 80 of the cover bucket 8 is passed through the shackle and the hook. Then, it is detachably connected (H) to either the annular end at the lower end of the lower cord 42 of the hanging rope 4 of any one of the five, or the shackle connected to the annular end. When the slinging work is completed, the crane operator who has been notified that the slinging work is completed will reach the construction site of the reinforcing bar joint where five or more lower reinforcing bars UB, UB, ... In the case of transport (J) and the weight 82 is connected to an appropriate place such as the cover bucket 8 during this transport (J), the rotation and runout of the reinforcing bar lifting device 1 are significantly suppressed. , Even if it is blown by a crosswind, the safety of transportation will be further enhanced. 1 and the five target reinforcing bars SB, SB, ... Suspended from it, to the top of the five or more lower reinforcing bars UB, UB, ... to be connected using the interstitial rope 81 of the cover bucket 8. Guidance (K) is performed, the suspension portion 80 is separated from the appropriate position near the lower end of the lower cord 42 of the suspension rod 4, the cover bucket is removed (L), and the five target reinforcing bars SB, SB, ... Untie the binding tool such as the crane wire (not shown) (M), and make one target reinforcing bar SB correspond to one lower reinforcing bar UB (N). (P), and as shown in FIG. 11, a pressure welding device PM is incorporated between the vicinity of the upper end of the lower reinforcing bar UB and the vicinity of the lower end of the target reinforcing bar SB to prepare for the construction of the reinforcing bar joint (Q). At this time, since the hold vise 5 is temporarily connected on the reinforcing bar joint construction length range L0 in which the lower end of the target reinforcing bar SB is secured by the exterior of the positioning cylinder 7 before being lifted by the crane, the pressure welding device PM is It can be smoothly mounted without being buffered by the hold vise 5.

After the upper end of the lower reinforcing bar UB and the lower end of the target reinforcing bar SB are temporarily fixed by the pressure welding device PM, the slinging / reinforcing bar joint worker disengages the temporary connection of the hold vise 5 (R) and incorporates the same pressure welding device PM. Reinforcing bar joint construction preparation work (N), ~ (R) is performed sequentially for the five target reinforcing bar SBs, and then the slinging / reinforcing bar joint worker starts the reinforcing bar joint construction preparation work (N), ~ (R). The crane operator who received the notification of the completion of the above pulls up the reinforcing bar lifting device 1 by the crane and detaches (S) it, and as shown in FIG. 12, the reinforcing bar joint worker moves the upper end of the lower reinforcing bar UB and the lower end of the target reinforcing bar SB. Gas pressure welding (T) is performed by applying heating from the outer circumference by the burner BN and axial butt pressure by the pressure welding device PM, and the same gas pressure welding (T) work is performed on the five lower reinforcing bars UB, It is constructed between the upper end of UB, ... and the lower end of the five target reinforcing bars SB, SB, ..., and the construction of five reinforcing bar joints is completed. By repeating (A) and (T), the construction of the five-unit reinforcing bar joint of the target reinforcing bar SB can be performed remarkably efficiently and safely.

(Conclusion)
As described above, the reinforcing bar holder of the present invention, the reinforcing bar lifting device using the same, and the construction method of the reinforcing bar joint can achieve the intended purpose by the new configuration, and are easy to manufacture. Compared to the conventional reinforcing bar lifting tool technology for cranes, the efficiency and safety of vertical lifting and transporting of reinforcing bars by cranes have been greatly improved, and the reinforcing bar lifting device has been made lighter and cheaper, making it far more economical. In addition to being able to do this, the work quality and work efficiency of the rebar joint construction can be significantly improved. In order to secure it, it is highly evaluated not only by the construction industry, which was in a situation where it was difficult to reduce the number of workers and shortening the construction period, but also by the builder who wants to reduce the construction cost, and it is widely used and spread. It is expected that it will become something that will continue.

1 Reinforcing bar lifting device 2 Balance
20 Same Master Link
21 Same balance cord
22 Same balance frame
23 Same hanging lower part 3 Reinforcing bar holder 4 Suspended rope
40 Same connection part (upper end)
41 Same as above
42 Same underline
L1 Length of the lower cord (or the distance from the lower end of the holding ring to the hold vise)
5 Hold Vise
50 Same lifting part
51 Tightening mechanism
52 Same vise department
53 Twistlock piece
54 Same zygote 6 Retaining ring
60 Same cylinder
L2 Same cylinder length
61 Same bracket
62 Same connecting hole
63 Same holding position adjustment mechanism
64 Same main flange
65 Same vertical groove
66 Same facing flange
67 Same holding bolt
68 Same holding piece 7 Positioning cylinder
70 Same opening
71 Same mounting depth regulation bottom
72 Same regulated steel rod
73 The same regulation pipe
74 Same handle
LS same gauge length 8 cover bucket (bag body)
80 Same hanging part
81 Kaishakunin rope
82 Same weight SB Target rebar (upper rebar)
L Overall length of the target reinforcing bar
L0 Reinforcing bar joint construction length range
L3 Same upper end exposed length UB Lower reinforcing bar PM pressure welding device BN Gas burner for pressure welding

Claims (10)

At the upper end of the rope, a suspension rope having a connecting portion to which the crane is connected is provided, and at the lower end of the suspension rope, from the lower end of the target reinforcing bar to the vicinity directly above the reinforcing bar joint construction length range. A hold vise that can be temporarily attached and detached is provided around the outside of the middle position of the target reinforcing bar, and from the lower end where the hold vise of the hanging cord is provided, it is closer to the upper end of the target reinforcing bar when it is temporarily connected to the hold vise. At least one holding ring that is loosely fitted near the upper end of the target reinforcing bar is provided in the middle of the hanging cable facing the target reinforcing bar, and the lower end of the target reinforcing bar can be loosely fitted to the target reinforcing bar. A tubular type with an opening, and a positioning cylinder with a mounting depth regulation bottom provided at a position where the gauge length is slightly shorter than the reinforcing bar joint construction length from the opening is separate from the suspension cord. Reinforcing bar holder characterized by being combined as. At the upper end of the rope, a suspension rope having a connecting portion to which the crane is connected is provided, and at the lower end of the suspension rope, from the lower end of the target reinforcing bar to the vicinity directly above the reinforcing bar joint construction length range. A hold vise that can be temporarily attached and detached is provided around the outside of the middle position of the target reinforcing bar, and from the lower end where the hold vise of the hanging cord is provided, it is closer to the upper end of the target reinforcing bar when it is temporarily connected to the hold vise. At least one holding ring that is loosely fitted near the upper end of the target reinforcing bar is provided in the middle of the hanging cable facing the target reinforcing bar, and the lower end of the target reinforcing bar can be loosely fitted to the target reinforcing bar. A tubular type with an opening, and a positioning cylinder with a mounting depth regulation bottom provided at a position where the gauge length is slightly shorter than the reinforcing bar joint construction length from the opening is separate from the suspension cord. When mounting on the target rebar, the lower end of the target rebar is known to the depth at which the positioning cylinder abuts on the mounting depth regulation bottom, and the holding ring is outside the upper end of the target rebar. While being loosely fitted around, the hold vise faces the opening at the position where the gauge length is from the mounting depth regulation bottom of the positioning cylinder, and from the lower end of the target reinforcing bar, it is near directly above the reinforcing bar joint construction length range. It is characterized in that it is temporarily connected to the outer periphery of the middle position of the target reinforcing bar in a detachable manner, and can be lifted from the upper end of the hanging cord to a crane so as to maintain the vertical posture of the target reinforcing bar. Reinforcing bar holder. The holding ring is composed of an inner diameter that is loosely fitted to the target reinforcing bar and a cylinder having a length of 20 cm to 100 cm, and can be connected to the outer peripheral wall of the cylinder at the middle part of the suspension cord. The reinforcing bar holder according to claim 1 or 2, wherein a holding position adjusting mechanism capable of adjusting the distance from the hold vise at the lower end of the holding ring to the holding ring is provided. When the hanging cord is hung in a straight line, the distance from the lower end of the holding ring to the hold vise is from the total length of the target reinforcing bar to the reinforcing bar joint construction length range, the length between the upper and lower ends of the holding ring, and the holding ring. The reinforcing bar holder according to any one of claims 1 to 3, which is set to a linear distance obtained by subtracting the total length of the exposed upper end of the target reinforcing bar protruding upward from the upper end. When the suspension cord is hung in a straight line, the length of the suspension cord from the lower end of the holding ring to the hold vise is from the total length of the target reinforcing bar to the reinforcing bar joint construction length range, the length between the upper and lower ends of the holding ring, The reinforcing bar holder according to any one of claims 1 to 3, which is set to a length obtained by subtracting the total length of the exposed upper end length of the target reinforcing bar protruding upward from the upper end of the holding ring. The positioning cylinder has an outer peripheral wall having a polygonal cross-sectional shape, and the mounting depth regulation bottom is a single-character rod arranged so as to penetrate in the diameter direction of the positioning cylinder, or crossed in a cross shape in the diameter direction. It consists of either two rods or a pipe body that is set to an outer diameter of about 1/2 of the outer wall width of the positioning cylinder and is integrally installed in the inner wall of the positioning cylinder. The reinforcing bar holder according to any one of claims 1 to 5, wherein the handle is provided around the outer circumference near the opening of the tip for carrying. It has a balance frame provided with a plurality of hanging portions separated by a horizontal direction, and a balance that can be suspended from a crane is provided, and the balance frames of the balance are suspended at least two places separated from each other. The reinforcing bar lifting device using the reinforcing bar holder according to any one of claims 1 to 6, wherein at least two reinforcing bar holders are suspended from each of the lower portions so as to be arranged substantially in equilibrium with each other. A bag made of soft material that can surround the lower end of the target reinforcing bar and the outer circumference near the lower end of the target reinforcing bar against the lower end of any one of the reinforcing bar holders provided. Therefore, a cover bucket having a hanging portion that is detachably connected to the lower end of the hanging rope and a cover bucket in which a kaishakunin rope is suspended from a bag having the hanging portion is detachably combined. , The reinforcing bar lifting device according to claim 7. Multiple target reinforcing bars are placed in a horizontal position, and the positioning cylinder is placed from the opening of the lower end of each target reinforcing bar to the depth where the lower end of each target reinforcing bar abuts on the bottom of each mounting depth regulation. Then, the rebar lifting device suspended from the crane is guided to the target rebar placed in a horizontal position, and held around the outer circumference near the upper end of the target rebar so that one rebar holder is incorporated into one target rebar. While the ring is loosely fitted, hold vices are temporarily connected from the lower end of the target reinforcing bar to the outer periphery of the middle position of the target reinforcing bar, which is near the area directly above the reinforcing bar joint construction length range facing the opening of the positioning cylinder. After incorporating the reinforcing bar holders in each of the target reinforcing bars, the reinforcing bar lifting device and the multiple target reinforcing bars incorporated in it are lifted until they are in a hanging position, and the positioning cylinder is pulled out by its own weight and left on the ground. In addition, the outer circumference of multiple target reinforcing bars is bundled together, and the reinforcing bar lifting device and multiple target reinforcing bars are guided to the multiple lower reinforcing bars to be connected by a crane, and multiple target reinforcing bars are connected. Either untie the target reinforcing bar and butt the lower end of the target reinforcing bar against the upper end of the lower reinforcing bar so that one lower reinforcing bar corresponds to one target reinforcing bar, and either construct the reinforcing bar joint or prepare for the construction of the reinforcing bar joint. The seventh aspect of claim 7, wherein one is performed, the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar are fixed, and then the temporary connection of the hold vise is released, and the reinforcing bar lifting device is pulled up and detached by a crane. Reinforcing bar joint construction method using the rebar lifting device of. Multiple target reinforcing bars are placed in a horizontal position, and the positioning cylinder is placed from the opening of the lower end of each target reinforcing bar to the depth where the lower end of each target reinforcing bar abuts on the bottom of each mounting depth regulation. Then, the rebar lifting device suspended from the crane is guided to the target rebar placed in a horizontal position, and held around the outer circumference near the upper end of the target rebar so that one rebar holder is incorporated into one target rebar. While the ring is loosely fitted, hold vices are temporarily connected from the lower end of the target reinforcing bar to the outer periphery of the middle position of the target reinforcing bar, which is near the area directly above the reinforcing bar joint construction length range facing the opening of the positioning cylinder. After incorporating the reinforcing bar holders in each of the target reinforcing bars, the reinforcing bar lifting device and the multiple target reinforcing bars incorporated in it are lifted until they are in a hanging position, and the positioning cylinder is pulled out by its own weight and left on the ground. In addition, the outer circumference of multiple target reinforcing bars is bundled together, the lower ends of multiple target reinforcing bars are covered with a cover bucket, and the hanging part of the cover bucket is connected near the lower end of the hanging cord. Then, it is transported to the vicinity of the multiple lower reinforcing bars to be connected by a crane, and the reinforcing bar lifting device and the multiple target reinforcing bars are guided to the multiple lower reinforcing bars to be connected by using the interstitial rope of the cover bucket and suspended. Remove the attachment part from the lower end of the hanging cord, remove the cover bucket, untie the multiple target reinforcing bars, and attach one target reinforcing bar to the upper end of the lower reinforcing bar. The lower ends of the target reinforcing bars are concentrically abutted, a pressure welding device is installed between the vicinity of the upper end of the lower reinforcing bar and the vicinity of the lower end of the target reinforcing bar to prepare for the construction of the reinforcing bar joint, and the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar are fixed. After that, the temporary connection of the hold vise is released, the reinforcing bar lifting device is pulled up and detached by the crane, the heating from the outer circumference by the burner between the upper end of the lower reinforcing bar and the lower end of the target reinforcing bar, and the shaft by the pressure welding device. The method for constructing a reinforcing bar joint using the reinforcing bar lifting device according to claim 8, wherein the butting pressure in the direction is applied to cause gas pressure contact.

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