JP4096202B2 - Bar arrangement device and method for concrete structures. - Google Patents

Description

  The present invention relates to a bar arrangement device and a bar arrangement method for a concrete structure.

When the PC steel strands are arranged in a coil shape or a spiral shape around the main rebar and used as a band rebar, there are the following advantages compared to the method of processing the rebar into a circular shape.
(1) Reinforcing bars need to be processed at the factory, but PC steel wires can be formed on site, so transportation is simple and economical.
(2) A large processing machine is required to bend the rebar with a large radius, but if it is a PC steel strand, a processing machine is not required and a coil having a required arrangement diameter can be formed on site.
(3) Since the strands of PC steel can be arranged as a continuous tensile material with a length of several hundred meters, the diameter in a circular section or the side in a rectangular section exceeds 2 meters, and the height is In a large columnar structure exceeding 4 meters, an excellent restraining effect can be expected when it is wound around the main reinforcing bar arranged in the vertical direction and arranged as a continuous band reinforcing bar.

Since it has the advantages as described above, a method of using a PC steel wire for the streaks of a large columnar structure is already known.
However, the conventional method is a construction method in which a PC steel strand is continuously wound around the outside of the main reinforcing bar, and is mainly used in combination with a moving formwork method such as a slip form method and a moving scaffold method.
PC steel strand is a high-strength steel material originally manufactured as a tension material for prestressed concrete, and when used as a reinforcing bar as in the present invention, it does not necessarily require the same strength as that of PC steel. However, in order to meet the required performance for the application of the present invention, it is flexible, and if it produces a small amount of steel material having a strength lower than that of a PC steel wire, it is manufactured in comparison with a mass-produced PC steel wire. Costs tend to be high and delivery times tend to be long. For this reason, there is a background in which a strand of PC steel having a strength higher than necessary is used as a flexible reinforcing bar. However, in the future, if the amount of use in the application of the present invention increases and the production cost decreases due to mass production, it has the same flexibility as the PC steel strand, and the strength is higher than that of the PC steel strand. Low steel materials may be used. Here, including such a steel material, it is called a PC steel strand in accordance with the current use situation.
When the main reinforcing bars are arranged in a plurality of circles partially overlapping on the plan view, the normal reinforcing bars are bent into a circular shape to form a band reinforcing bar, and when the band reinforcing bars are arranged in a coil around the circular main reinforcing bar, It is known that the amount of band reinforcement can be greatly reduced as compared with the case of normal reinforcement in which the main reinforcement and the band reinforcement are arranged in a grid because the restraining effect by the band reinforcement is efficiently performed. As described above, regarding the construction method in the case of using ordinary reinforcing bars by bending them into the so-called “interlocking bar arrangement” in which the main reinforcing bars are arranged in a plurality of circles partially overlapping on the plan view, [Patent Document 3], which is a known technique.

Japanese Patent Application Laid-Open No. 8-158652 JP-A-11-93420 Japanese Patent No. 3527913

However, the conventional method of spirally winding a strand of PC steel around a main reinforcing bar arranged in a cylindrical shape using a strand of PC steel has the following problems.
(1) A device for winding PC steel strands around the main rebar is generally used in combination with relatively large-scale moving frame method and moving scaffold method device, and the height is 30 meters. Although it is advantageous in the case of constructing a structure that exceeds 1, the cost and the construction cost of installing and removing the apparatus are large, and the advantage cannot be exhibited.
(2) The conventional PC steel strand winding device is applied in the case of the so-called “interlocking bar arrangement” in which the main rebars a are arranged in a plurality of circles partially overlapping on the plan view. It is not possible.

In order to solve the above-described problems, the concrete structure reinforcing bar arrangement apparatus according to the present invention is made of PC steel as a band reinforcing bar around a main reinforcing bar arranged in the vertical direction of the concrete structure at a predetermined interval. A bar arrangement apparatus for arranging wires, which is a turntable on which a coil of stranded wire is mounted, and is located around the turntable, at a plurality of locations on the circumference close to the arrangement diameter of the above-mentioned reinforcing bars It is arranged and placed in multiple places between the stacking guide that guides the stacking of the PC steel wires in a vertical line, and between the stacking guide and the stacking guide, and the PC steel strands from the design interval of the strip reinforcement A temporary stand with a hook group that engages at a narrow interval, a suspension frame that suspends a plurality of temporary support stands together with a strand of PC steel engaged with the hook, and a suspension frame suspended from the installation frame. Than The hanger with a hook group that engages at the design interval of the rebar and a plurality of alignment hangers are lifted together with the PC steel strand engaged with the hook and hung around the main rebar and installed. A bar arrangement device for a concrete structure, characterized by comprising an installation frame.
In addition, the present invention uses the above bar arrangement device, draws out the PC stranded wire mounted on the turntable from the coil state, and stacks it along the stacking guides arranged around the turntable, thereby designing the band reinforcing bar. The PC steel strands stacked on the circumference line, which is approximately equal to the arrangement diameter, and then stacked on the stacking guide, are engaged with the hooks of the temporary support stand at intervals smaller than the design interval of the strip reinforcement, and the suspension frame A plurality of temporary support stands are lifted together with the PC steel wires engaged with the hooks, moved to another place, and then each of the PC steel wires engaged with the hooks of the temporary support stands are designed one by one. Engages the hooks of the alignment hangers suspended from the installation frame at intervals equal to the interval, and the installation frames lift multiple alignment hangers together with the PC steel strands engaged with the hooks. The concrete bar arrangement method is characterized in that it is hung around a vertically installed main reinforcing bar group and is installed by attaching a PC strand to the main reinforcing bar.
Further, the bar arrangement method of the present invention uses the above bar arrangement device, pulls out the PC steel wire mounted on the turntable from the coil state, and stacks it along the stacking guide arranged around the turntable. Stack the steel bars on the circumference line approximately equal to the design arrangement diameter of the strip reinforcement, and then engage each PC steel strand on the stacking guide with the hook of the temporary support stand at an interval narrower than the design interval of the strip reinforcement Then, the plurality of temporary support stands are lifted together with the PC steel wires engaged with the hooks by the suspension frame and moved to another place, and the plurality of suspension frames are brought close to each other together with the temporary support stand and the PC steel wires. Part of the PC steel wire is overlapped in a plane, and then one PC steel wire engaged with the hook of the temporary support stand is placed at an interval equal to the design interval of the strip reinforcing bar, and P A state in which a part of the C-strand stranded wire is overlapped on a plane and engaged with a hook of an alignment hanger suspended on an installation frame, and a plurality of alignment hangers are overlapped on a plane by the installation frame. It is characterized in that it is lifted together with the PC steel wire engaged with the hook and suspended around the vertically installed main reinforcing bar group, and the PC steel wire is attached to the main reinforcing bar. It is a bar arrangement method for concrete structures.

Since the concrete structure bar arrangement apparatus and method of the present invention are as described above, the following effects can be obtained.
(1) By using PC steel strands that are more flexible than ordinary reinforcing bars, it is possible to easily form a reinforcing bar structure in which the main reinforcing bar group and the helical reinforcing bar are engaged.
(2) Even with a complicated structure in which a part of helical rebar overlaps, it can be manually arranged and accurately arranged without relying on the skill of a skilled worker.

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

<1> Overall configuration.
The method and apparatus of the present invention uses a turntable, a stacking guide, a temporary support stand, a suspension frame, an alignment hanger, and an installation frame.

<2> Turntable 1.
The PC steel strand p which is the subject of the present invention is more flexible than a reinforcing bar and is transported in a state of being cut into about 200 to 300 m and wound up in a coil shape.
When carrying, it is advantageous that the coil has a small diameter, which does not match the array diameter of the reinforcing bars of the target structure.
Therefore, it is necessary to mount the PC steel stranded wire p on the turntable 1, pull it out from the coil, and rewind it to a diameter equal to the array diameter of the strip reinforcing bars of the target structure.
The turntable 1 is a turntable for temporarily placing and rewinding the coil of such a PC steel stranded wire p.

<3> Stacking guide 2.
The stacked guides 2 are installed at a plurality of locations around the turntable 1 so as to surround the turntable 1.
The arrangement positions of the plurality of stacked guides 2 are on a circumferential line substantially equal to the array diameter of the band reinforcing bars of the structure to be constructed.
The stacked guide 2 is composed of two or two guide members 21 installed vertically in parallel.
The distance between the guide plates is formed as a distance slightly larger than the diameter of the wire p1 from the PC steel, so that the two wires p from the two PC steels are placed in parallel in the same plane between the two guide plates. In the case where the PC steel wire p is inserted, the PC steel wires p are stacked in an orderly manner.
The inner guide plate, that is, the plate on the turntable 1 side is formed shorter than the outer one, and the upper end is formed inward so that the wire p can be smoothly inserted from the PC steel.

<4> Temporary receiving stand.
The temporary support stand 4 is a gantry that can stand on the ground, and is constructed so as to protrude from a lifting arm 41 and can be lifted by a suspension frame described later.
The temporary support stand 4 is not necessary when the main reinforcing bars a are arranged in a single circle on the plan view, and is used when arranged in a plurality of circles that partially overlap each other.
A plurality of rotating hooks 42 are attached to the temporary receiving stand 4 via horizontal pins.
Since this horizontal pin is located at a position shifted in the outer direction of the coil from the position of the wire from the PC steel, the rotating hook 42 is usually suspended by its own weight while avoiding the outward direction, and the wire is moved up and down from the PC steel. It does not become an obstacle when doing. When the PC steel strand is engaged with the rotary hook 42, the operator pushes the rotary hook 42 inward with the PC steel wire pulled up above the rotary hook 42, and releases the hand from the PC steel. .
The rotating hook 42 is formed by bending a round bar having a diameter of about 6 mm into a U shape and joining washers for passing a horizontal pin at both ends. The parallel parts of the U shaped round bar are perpendicular to each other in two directions. It is bent and formed into an L shape as a whole. Round ends are connected continuously at the tip of the hook, and on the pin side, two washers face each other sharing the central axis of the pin hole.
The interval between the upper and lower sides of the hook 42 is set to be narrower than the design interval of the band reinforcement.
When the interval between the hooks 42 is too narrow and the rotation of the hooks 42 is hindered, the positions of the hooks 42 may be shifted and arranged in a plurality of rows.
In the embodiment, the hook 42 is attached to the vertical plate 43 through a horizontal pin, and two vertical plates 43 are arranged.
If the height adjusting bolt 44 is attached to the upper end of the vertical plate 43, the position of the hook 42 can be finely adjusted.
The reason why such a slight adjustment of the position is necessary is that the PC steel wire has a spiral shape whose entire length is continuous, so that the height of the provisional stand 4 varies slightly depending on the position of the temporary support stand 4.
The temporary support stand 4 is arranged at a plurality of positions at equal positions between the stacking guide 2 and the stacking guide 2.

<5> Hanging frame.
When the PC steel wire is engaged with the hooks 42 of the plurality of temporary receiving stands 4, a coil of the PC steel wire is formed. This coil is lifted together with the temporary receiving stand 4.
For this purpose, for example, a cross-shaped suspension frame 5 made of H-shaped steel and steel pipe is used.
If the arm 41 of the temporary support stand 4 is attached to the wire hung from the suspension frame 5, the temporary support stand 4 and a PC steel stranded wire formed in a coil shape having a diameter substantially equal to the design arrangement diameter of the band reinforcing bar are connected. Can be lifted.
The suspension frame is unnecessary when the main reinforcing bars a are arranged in a single circle on the plan view, and is used when the main reinforcing bars a are arranged in a plurality of circles partially overlapping.

<6> Alignment hanger 3
The alignment hanger includes a rod-shaped hanger column 31 and a rotatable rotary hook 32 attached to the hanger column 31 via a space.
The length of one hanger column 31 is set to, for example, a length of about 50 cm in consideration of workability of attachment / detachment to / from the installation frame and various coil heights.
An upper end hook 33 is formed at the upper end of the alignment hanger 3 and a ring 34 is formed at the lower end, and the upper end hook 33 of the lower alignment hanger is engaged with the ring 34 of the upper alignment hanger, thereby sequentially. Configure to extend.
The rotation hooks 32 provided on the alignment hangers 3 are the same members as the rotation hooks 42 attached to the temporary support stand 4 and are attached to the hanger pillar 31 in a plurality of stages via horizontal pins.
As with the rotary hook 42 attached to the temporary support stand 4, the horizontal pin is located in a position shifted from the PC steel wire to the outside of the coil. I'm hanging. For this reason, when the PC steel strand is removed from the rotary hook 32 and fixed to the main rebar a, and the alignment hanger 3 is removed together with the installation frame 6, the rotary hook 32 is not caught on the wire p from the PC steel.
When the PC steel strand P is engaged with the hook, the operator rotates to cause the PC steel strand P to engage therewith.
The interval between the rotary hooks 32 is set to be equal to the design interval of the band reinforcement of the target structure to be constructed.

<7> Main reinforcing bar group.
The present invention is directed to the case where a plurality of main reinforcing bars a arranged in the vertical direction are arranged in a circle on a plan view. There are cases where the arrangement of the main reinforcing bars a group is a single circle, and there are cases of so-called interlocking reinforcement arrangements in which a part of the circles overlaps with each other, and the reinforcement arrangement method of the present invention is in either case. Can be adopted.

<8> Installation frame.
The installation frame 6 is a device that lifts a single ring when the arrangement of the main reinforcing bars a is a single circle, and a plurality of coils when it is a plurality of circles partially overlapping each other. Has a coil for hooking the upper end hook 33 of the alignment hanger 3 at a position divided into four equal parts. The main rebar a group rises vertically above the concrete surface and is higher than the height of the coil, so the installation frame 6 can be inserted and hung between the rebars of the arranged main rebar a and the rebar. It has become.

<1> Construction method.
Next, the order of the bar arrangement method of this invention is demonstrated about the case where the main reinforcement a group is arranged in the single circle on the top view.

<2> PC steel wire p is mounted on the turntable 1.
A coil of PC steel stranded wire p is mounted on the turntable 1, pulled out from one end of the coil, and then wound again to a diameter equal to the array diameter of the reinforcing bars of the target structure.
For this purpose, the turntable 1 is rotated and the wire p is drawn from the PC steel.

<3> Transfer from the turntable 1 to the stacking guide 2. (Figure 2)
The PC steel strand p drawn from the coil state is stacked between the two guide members 21 of the stacked guide 2.
The plurality of stacked guides 2 are arranged with a diameter substantially equal to the array diameter of the band reinforcing bars of the structure to be constructed.
For this purpose, the PC steel stranded wire p is piled up in a cylindrical shape having a diameter substantially equal to the array diameter of the band reinforcing bars of the structure to be constructed and having the diameter of the wire p as a thickness.

<4> The alignment hanger 3 is suspended.
A plurality of alignment hangers 3 are suspended on a common installation frame 6 and suspended on the circumference of a strand of PC steel formed by stacked guides.
The position where the alignment hanger 3 is suspended is outside the coil of the PC steel strand.

<5> From the stacking guide 2 to the alignment hanger 3. (Fig. 7)
One PC steel strand p is engaged with the hook 32 of the alignment hanger 3 in a state of being suspended from the installation frame.
At that time, an operator standing around the coil of the PC steel strand manually pulls up the PC strand from the top to the position of the rotary hook 32 step by step.
As a result, the PC steel strands p are arranged at regular intervals inside the alignment hanger 3, and this interval is equal to the design interval of the reinforcing bar of the target structure.
When the transfer from the stacking guide 2 depends on a person, if the length of the alignment hanger 3 is long, it will not be reachable, and a high scaffold will be required, which is uneconomical.
Therefore, as described above, the length of the hanger column 31 is shortened, the upper end hook 33 of the lower alignment hanger 3 is engaged with the ring 34 at the lower end, and the installation frame 6 is gradually pulled up and extended. Go.
Since one alignment hanger 3 is always located within the reach of the operator's hand, the PC steel strand p is engaged while gradually lifting the installation frame 6 with a crane according to the attachment state of the PC steel strand p. I do.

<6> Reinforcement of main reinforcing bar a.
On the other hand, at the site where the structure is constructed, the main reinforcing bars a in the vertical direction are arranged on the circumference in a state of drawing one circle.

<7> Unloading the alignment hanger. (Fig. 8)
When the entire length of the wire P is attached to the alignment hanger 3 from the PC steel, the installation frame 6 is pulled up by a crane, and the wire is pulled up from the alignment hanger 3 and the PC steel engaged in a coil shape.
And the installation frame 6 is gently hung from the upper direction in the state which the main reinforcement bar a group arrange | positioned at the circumference surrounds the strand p from PC steel.

<8> Binding of spiral PC steel strand p and main rebar a.
The PC steel wire p is arranged on the outer periphery of the main reinforcing bar a group arranged in a circumferential manner via the alignment hanger 3.
Therefore, the wire p is removed from the PC steel from the hook of the alignment hanger 3, and is bound to the main rebar a with a thin iron wire or the like.
In this way, the multi-stage PC steel wire p formed in a spiral shape can be orderly fixed to the outer surface of the main reinforcing bar a group.
When the binding is finished, the installation frame 6 is lifted together with the alignment hanger 3 and removed.

<9> Placing concrete.
A formwork is assembled on the outer periphery of the main rebar a group, and concrete is placed inside.
In this way, the target reinforced concrete structure is completed.

<10> In the case of polymerization arrangement.
The above describes the case where the main reinforcing bars a are arranged in a single circle on the plan view. Next, in the case of a so-called interlocking arrangement, The difference will be mainly described.
The process until the PC steel strand is mounted on the turntable and stacked in the stacking guide 2 is the same as that described above.

<11> From the stacking guide to the temporary receiving stand 4. (Fig. 4)
The temporary support stand 4 is arranged between the stacking guide 2 and the stacking guide 2 at, for example, four locations.
Therefore, the PC steel strands that are neatly stacked on the stacking guide 2 are engaged with the hooks 42 of the temporary receiving stand 4 one by one in order from the top.
When the PC steel strand is engaged, the hook 42 is pushed inward of the coil.
As a result, the PC steel strands are arranged at regular intervals on the hooks 42 of the temporary support stand 4, but this interval is narrower than the design interval of the steel bars.
The reason why the PC steel wire is attached to the temporary support stand 4 at an interval narrower than the design interval is that a temporary coil is formed from the PC steel wire within the reach of the operator while standing on the ground. This is for lifting up.
If the distance between the hooks 42 of the temporary support stand 4 is equal to the design interval of the reinforcing bars, the worker cannot reach the position of the upper strand of the PC steel, and it becomes necessary to assemble a scaffold inside the worker. It is necessary to work while moving up and down the scaffolding, which is extremely uneconomical.

<12> Lifting of the temporary receiving stand 4 groups. (Fig. 5)
When the entire length of the PC steel strand is engaged with the hook of the temporary support stand 4, coils of the PC steel supported by the temporary support stand 4 at, for example, four locations are formed.
In this state, the wire of the suspension frame 5 is attached to the arm of the temporary receiving stand 4.
Then, the plurality of temporary receiving stands 4 are lifted together with the PC steel wires engaged with the hooks 42.
Since the temporary support stand 4 is arranged at a plurality of places on the design circumference of the band rebar, the PC steel wire is also formed in a cylindrical shape as a coil in which the design circle of the band rebar is substantially drawn.
In that state, hang it in another work yard.
Since the temporary support stand 4 can be self-supported by its legs, it is installed in the yard while keeping the PC steel strand in a coiled state.

<13> Coil polymerization. (Fig. 9.10)
After the first formed PC steel wire coil is moved to the other work yard together with the temporary support stand 4, a new PC steel wire is mounted in the turntable and a new temporary support is placed between the stacking guides 2. Install the stand 4 and form the second coil in the same way as before, hang it with the suspension stand 5 together with the temporary stand 4 and move it to the yard where the first coil was placed, approaching the ground as much as possible. While suspending in the state where it was made to move, the center is brought closer so that the first coil on the ground partially overlaps.
Even if the adjacent PC steel wire p is approached, the PC steel strand p is slightly different in height at both ends, so the adjacent PC steel wire p is inserted between one PC steel strand p. Can be positioned.
In this way, a plurality of helical PC steel strands p are arranged in a state in which a part thereof is overlapped in a plane.

<14> Move to the alignment hanger. (Fig. 7)
When the PC steel stranded wires are arranged in a plane, the operator enters the inside of each coil of the PC steel stranded wires, and removes each of the PC steel stranded wires from the hook 42 of the temporary support stand 4.
Then, the hook is reengaged with the hook 32 of the alignment hanger 3 suspended from the installation frame.
Since one alignment hanger 3 is always located within the reach of the operator's hand, the PC steel strand p is engaged while gradually lifting the installation frame 6 with a crane according to the attachment state of the PC steel strand p. I do.
When the PC steel strand is engaged with each rotary hook 32 of one alignment hanger 3, the lower alignment hanger 3 is extended.
Since the PC steel strands are superposed in a plane, an operator who has entered each coil of the PC steel strand can engage the PC steel strands with the hooks 32 of the alignment hanger 3 at an arbitrary speed. First, it is necessary to engage with each other while confirming the order of the strands of PC steel strands that are polymerized.

<15> Arrangement of main reinforcing bars a.
At the site where the structure is constructed, the main reinforcing bars a in the vertical direction are arranged in a circle on the plan view. In the case of interlocking reinforcing bars, the main reinforcing bar a group is a plurality of parts partially superposed in plan view. It is arranged in a circular shape.

<15> Hanging hanger. (Fig. 11)
When the entire length of the wire P is attached to the alignment hanger 3 from the PC steel, the installation frame is pulled up with a crane, and the wire is pulled up from the alignment hanger 3 and the PC steel engaged in a coil shape.
In that case, as shown in the example in the figure, since a plurality of pairs of coils of PC steel strands are superposed in a plane, all of them are integrated using an installation frame 6 that can lift up a plurality of coils collectively. Need to lift.
Then, a plurality of PC steel stranded coils are gently suspended from above in a state where the PC steel wire p surrounds the main reinforcing bar a group arranged in a circumferential shape.

<16> Binding of stranded wire p and main rebar a with PC steel.
The wire p from the spiral PC steel is sequentially removed from the hooks of the alignment hanger 3 and bound to the main rebar a.
In this case, the high-strength PC steel strand must be tied to the main rebar at a high position, so the operator needs to work on the scaffold.
When the binding is finished, the installation frame 6 is lifted together with the alignment hanger 3 and removed.

<17> Placing concrete.
Assemble the formwork around and place concrete inside to complete the construction of the interlocking reinforcement structure.

Explanatory drawing of the state which pulls out a wire from PC steel from a turntable. Explanatory drawing of the state which transfers a strand from PC steel to a stacking guide from a turntable. Explanatory drawing of temporary stand Explanatory drawing of the arrangement | positioning state of the hook of a temporary support stand. Explanatory drawing of the state which lifts a wire from a temporary support stand and PC steel. Explanatory drawing of the alignment hanger. Explanatory drawing of the state transferred to an alignment hanger from a stacking guide. Explanatory drawing of the state which hangs an installation frame with respect to a main reinforcing bar group. Explanatory drawing of the state which makes the coil of a some PC steel wire approach. The top view of the state which superposed | polymerized the coil of the some strands of PC steel. Explanatory drawing of the state which arrange | positions a helical PC steel strand around interlocking reinforcement.

Explanation of symbols

1: Turntable 2: Stacking guide 3: Alignment hanger 4: Temporary support stand a: Main bar p: PC steel strand

Claims (4)

A bar arrangement device that arranges a strand of PC steel as a band reinforcing bar around a main reinforcing bar arranged in the vertical direction of a concrete structure,

A turntable with a coil of PC steel wire,
A stacking guide that is positioned around the turntable and is arranged at a plurality of locations on the circumference close to the arrangement diameter of the band reinforcing bar, and guides to pile up the PC steel wires in a vertical line;
A temporary support stand provided with a hook group that is arranged at a plurality of positions between the stacking guide and the stacking guide, and that engages the PC steel strands at an interval narrower than the design interval of the strip reinforcement;
A suspension frame for lifting a plurality of temporary support stands together with a PC steel wire engaged with a hook;
An alignment hanger with a hook group that hangs on the installation frame and engages the PC steel strands at the design interval of the steel bars,
An installation frame in which a plurality of alignment hangers are hung together with a PC steel wire engaged with a hook and hung around a main reinforcing bar,
A bar arrangement device for concrete structures composed of
Temporary stand is
Independently, it can be lifted by a hanging frame,
With multiple rotating hooks,
The reinforcing bar arrangement device for a concrete structure according to claim 1.
Using the bar arrangement according to claim 1,
A bar arrangement method for a concrete structure in which main reinforcing bars are arranged in a single circle on a plan view,
Pull the stranded wire from the PC steel mounted on the turntable from the coil state,
By stacking along the stacking guides placed around the turntable, they are stacked on a circumference that is approximately equal to the design arrangement diameter of the strip reinforcement,
One strand of PC steel,
Engage the hooks of the alignment hangers suspended from the installation frame at an interval equal to the design interval of the steel bars
A plurality of alignment hangers are lifted together with PC steel wires engaged with the hook by the installation frame,
Hanging around the main reinforcing bar group in the vertical direction installed in advance,
PC wire is attached to the main rebar,
Reinforcement method for concrete structures.
Using the bar arrangement device according to claim 1,
A bar arrangement method for a concrete structure in which main reinforcing bar groups are arranged in a plurality of circular shapes partially overlapping on a plan view,
Pull the stranded wire from the PC steel mounted on the turntable from the coil state,
By stacking along the stacking guides placed around the turntable, they are stacked on a circumference that is approximately equal to the design arrangement diameter of the strip reinforcement,
Next, one PC steel wire piled up on the stacking guide is engaged with the hook of the temporary support stand at an interval narrower than the design interval of the strip reinforcement,
A plurality of temporary support stands are lifted together with the PC steel wire engaged with the hook by the hanging frame, and moved to another place.
A new coil is mounted on the turntable,
Place a new temporary stand,
Form the second coil in the same way as the first,
Lift the coil together with a temporary stand with a hanging frame,
Approach the center so that a part of the first coil overlaps the plane,
Next, one strand of PC steel engaged with the hook of the temporary support stand,
Engage the hooks of the alignment hangers suspended from the installation frame at intervals equal to the design interval of the steel bars and with a part of the PC steel wires superimposed in a plane.
A plurality of alignment hangers are lifted together with PC steel wires engaged with the hooks in a state where a part of the hangers is overlapped with the installation frame,
Hanging around the main reinforcing bar group in the vertical direction installed in advance,
PC wire is attached to the main rebar,
Reinforcement method for concrete structures.

Images