JP2000110364A - Reinforcing method and reinforcing wire winding equipment for columnar structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit accurate winding of reinforcing wires without requiring a wide working area around a columnar structure to be reinforced by drawing out reinforcing wires from a rotation drum turning and rising around the columnar structure and reinforcing the columnar structure by winding the reinforcing wires around the surface of the columnar structure. SOLUTION: Two legs of guide posts 10 are erected on a foundation 102 by providing a predetermined interval from a bridge pier 100 as a columnar structure, the upper end 11 of the guide posts 10 is contacted to the bottom surface of the bridge pier sleeper beam 101, butted up and down by providing a jack 13 at the bottom end 12 and is fixed. A rotation drive equipment 21 is attached to a lifting device 20 installed to the guide post 10, and a ring-shaped fixing frame 30 is fixed provided by winding around the bridge pier 100. A rotation drum 40 attached to a fixed frame 30 is rotated by the rotation drive equipment 21, the rotation drum 40 provided by surrounding the bridge pier 100 takes up the reinforcing wires 41, and the reinforcing wires 41 are wound around the periphery of the surface of the bridge pier 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a columnar structure such as an existing pier or a pillar of a building, and a reinforcing wire winding apparatus for efficiently winding an elongated wire on the surface of the columnar structure.

[0002]

2. Description of the Related Art In recent years, it has been pointed out that there is a problem in seismic resistance of bridge piers, building columns, and the like, and existing structures have been extensively reinforced. As a method of reinforcement, a method of attaching a steel plate to the surface of the structure, a method of adding cast-in-place concrete with reinforcing steel, and a method of injecting mortar etc. between the panel and the surface of the structure with a precast concrete panel Various reinforcing methods such as a method, a method of attaching a high-strength resin fiber sheet such as carbon fiber, and a method of winding a PC steel material have been proposed. In carrying out the reinforcement, the best method will be selected from these methods taking into account the local situation, the shape of the structure, the state of the structure, and the like.

[0003] Among these methods, a relatively simple and effective technique of winding a PC steel wire around the surface of a structure is disclosed in JP-A-9-25613 and JP-A-9-2420.
Although proposed in Japanese Patent Publication No. 16 and the like, there is a problem that a considerably large space is required around the column in order to make the winding device traveling on the ground run around the column.

In Japanese Patent Application Laid-Open Nos. 10-18409 and 10-184010, a rotating drum is provided on an upper support base of a temporary base that straddles a columnar structure, and a PC strand is fed from the rotating drum to extend the columnar structure. A technique for wrapping is disclosed. This technique is applicable only when the columnar structure has no superstructure. Also, PC
In order to wind the strand around the columnar structure, manual work is required.

[0005]

The present invention relates to a columnar structure to be reinforced in a case where there is no extra space around a pier of a bridge or a pillar of a building, or when the columnar structure has an upper structure. However, it is an object of the present invention to provide a method for reinforcing a columnar structure and a reinforcing wire winding device capable of efficiently winding a reinforcing wire around a columnar structure with an accurate wire pitch. is there.

[0006]

Means for Solving the Problems The present invention has been made to achieve the above-mentioned object. In reinforcing a columnar structure, a reinforcing wire rod is fed out from a rotating drum that rotates and moves up and down around the columnar structure. A method of reinforcing a columnar structure, comprising winding a reinforcing wire around the surface of the columnar structure. Thereafter, mortar or concrete covering the reinforcing wire may be applied for rust prevention or makeup. In this case, if the reinforcing wire is wound around the surface of the columnar structure at a set pitch while applying a set tension to the reinforcing wire from the rotary drum, the reinforcing wire is tensioned at a desired pitch and the reinforcing wire is formed into the columnar structure. It is suitable because it can be wound around.

An apparatus according to the present invention, which can suitably carry out the above method, comprises a plurality of guide posts erected around a columnar structure, an elevating device suspended on each of the guide posts, and the elevating device. A fixed frame surrounding the columnar structure, the rotating drum being rotatably mounted on the fixed frame and feeding out a reinforcing wire, and a rotary drive device provided in the elevating device for rotating the rotary drum. It is a device for winding a reinforcing wire for a columnar structure. Further set the lifting speed of the lifting device, the rotation speed of the rotary drive device, and the tension of the feeding reinforcing wire,
It is preferable to provide a control device for controlling these, since the reinforcing wire can be wound around the columnar structure accurately and quickly with a desired winding force.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an example in which the apparatus of the embodiment is used to reinforce an existing pier, FIG. 2 is a cross-sectional view thereof (a view taken along the line AA in FIG. 1), and FIG. It is a B section detailed view. A two-post guide post 10 is erected on a foundation 102 at a predetermined distance from a pier 100 which is a columnar structure.
In this example, the upper end 11 of the guide post 10 is
1 and a jack 13 is provided at the lower end 12 of the guide post 10 so as to project vertically and to be fixed. An elevating device 20 is attached to the guide post 10. The rotary drive device 21 is integrally attached to the lifting device 20. A ring-shaped fixed frame 30 surrounding the columnar structure (the bridge pier 100) is provided.
Is fixed integrally to the frame 22. The rotating drum 40 is attached to the fixed frame 30. The rotating drum 40 is rotated by the rotation driving device 21. The rotary drum 40 is provided so as to surround the pier 100, stores the reinforcing wire rod 41, and feeds out the reinforcing wire rod 41.
The reinforcing wire 41 is wound around the surface of the pier 100.

As shown in FIGS. 2 and 3, the guide post 10
The lifting device 20 is moved up and down by a lifting rack 24 provided on the guide post 10 and a pinion 26 of a drive motor 25. The lifting device 20 is guided by a number of guide rollers. The drive motor 25 is a motor with a speed reducer and rotates synchronously with a drive motor mounted on another post guide and moves up and down at a synchronous speed.

The rotary drum 40 suspended on the fixed frame 30 is driven to rotate by the drive motor 23 of the rotary drive device 21. The rotary drive motor 23 also has a speed reducer and rotates at a constant speed in synchronization with the rotary drive motor mounted on another post guide.

Whether the winding pitch (winding interval) of the reinforcing wire is the same pitch over the entire winding range or the winding pitch is arbitrarily changed depends on the rotation speed of the rotary drum and the lifting speed of the lifting device. Can be arbitrarily changed by adjusting. That is, in the apparatus of the present invention, a control device for controlling the elevating speed of the elevating device 20 and the rotating speed of the rotary drive device 21 can be provided in parallel, and the elevating speed of the elevating device 20 and the wire feeding speed of the rotary drum 40 are It can be controlled at a fixed ratio. For these controls, a known control technique can be used. Further, a constant tension can be applied to the reinforcing wire by means for controlling the traction force of the rotating drum. This tension application control can be appropriately performed using a known technique.

The fixed frame 30 and the rotating drum 40 are
A plurality of (2 to 4) arc-shaped ring-shaped members are assembled with bolts at the base of the pier 100, the guide posts 10 are erected, and the rotary drive device 21 and the lifting device 2
0 is attached to the guide post 10. The reinforcing wire 41 carried in from the wire maker is wound around the rotating drum 40 by the rotation driving device 21 in an amount necessary for winding the columnar structure to be reinforced.

In this example, a 9.5 mm (7-stranded, JIS G3536 equivalent) PC strand was used as a reinforcing wire. The reinforcing wire is not limited to this, and may be a high-strength synthetic resin wire such as PC steel wire, galvanized iron wire, carbon fiber, and aramid fiber. The diameter of the wire may be determined in consideration of the degree of flexibility and the strength required for reinforcement.

One end of the reinforcing wire 41 is fixed to the frame of the columnar structure to be wound, and the rotating drum 40 is driven and the elevating device 20 is moved up and down at a constant speed to apply a certain tension to the reinforcing wire. At the same time, the reinforcing wire 41 can be spirally wound around the columnar structure with a predetermined pitch.

In this embodiment, the guide post 10 has two legs. However, when the structure has a large cross section and the outer diameter of the rotary drum 40 is large, the guide post 10 may have three legs or more.

In the winding of the wire by the apparatus and method of the present invention, the tension applied to the wire is determined by the performance of the rotary drive motor 23,
By controlling the reduction ratio and the like, it can be strictly controlled, and can be closely attached to the surface of the structure to restrict the swelling and deformation of the structure and enhance the reinforcing effect.

The reinforcing wire 41 may be wound from bottom to top or from top to bottom. Further, the columnar structure is not limited to a circular column, but may be a rectangular column. In the case of a prism, if a flexible strand is used for the wire, it can be in close contact with the structure surface,
preferable.

When the reinforcing wire has been wound around the required area, the end of the reinforcing wire is fixed to the structure body with a fastener similarly to the start terminal, and the winding device is disassembled. Spray mortar for rust prevention and makeup of the wire rod, or assembling the formwork and constructing cast-in-place concrete to complete the reinforcement.

FIGS. 4 and 5 show another embodiment. FIG. 4 shows a bridge body (bridge girder) without using a pier pillow at the upper end of the guide post.
This is an example in which the bottom portion of the base 103 is used. Thus, the selection range of the standing position of the guide post can be widened.

FIG. 5 shows an example applied to a case where the columnar structure is a pillar of a building, in which the guide post 10 is erected between upper and lower floors 104, that is, between beams. The method of using the winding device in this case is the same as that of the pier.

The method of transmitting mechanical force such as lifting and lowering and rotation of the apparatus of the present invention is not limited to the rack and pinion shown in this embodiment, but includes sprockets and chains, gears and gears, and other well-known sets thereof. Needless to say, it can be combined.

[0023]

According to the present invention, a high-precision reinforcement is required under the condition that a large work place is not required around the columnar structure to be reinforced and the upper structure is already provided above the columnar structure. Wire winding can be performed.

When the method and apparatus of the present invention are used to reinforce an existing columnar structure whose demand is expected to increase in the future, a plurality of guide posts are provided around the columnar shape on a circumference surrounding the structure. And a fixed frame that supports a rotating drum suspended by the lifting device, a rotating drive unit integrated with the lifting device, and a rotating drum that is suspended by the lifting device and rotated by the rotating drive device. Composed of
Along with the guide post, the reinforcing wire is rotated up and down around the columnar structure while feeding the reinforcing wire from the rotating drum, and the reinforcing wire is spirally wound around the surface of the columnar structure, and then for rust prevention and makeup of the reinforcing wire. By applying the mortar or concrete described above, it is possible to reinforce a deteriorated structure or an existing columnar structure having a problem with earthquake resistance, and the effect of contributing to maintenance of social capital is great.

[Brief description of the drawings]

FIG. 1 is a side view showing an example in which the embodiment device is used for reinforcing a pier.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a detailed view showing a relationship between a lifting device and a reinforcing wire rod drum.

FIG. 4 is a schematic side view showing a method of use.

FIG. 5 is a schematic side view showing a method of use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Guide post 11 Upper end 12 Lower end 13 Jack 20 Elevating device 21 Rotary driving device 22 Frame 23 Drive motor 24 Elevating rack 25 Elevating motor 26 Pinion 30 Fixed frame 40 Rotating drum 41 Reinforcement wire 43 Locking tool 100 Bridge pier (columnar structure) 101 Pillows 102 Foundation 103 Bridge 104 Floor

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiaki Suzuki 3-4-1 Marunouchi, Chiyoda-ku, Tokyo PS Co., Ltd. F-term (reference) 2D059 AA03 GG40 2E176 AA04 BB15 BB29

Claims (4)

[Claims] When reinforcing a columnar structure, a reinforcing wire is fed out from a rotating drum that rotates and moves up and down around the columnar structure, and the reinforcing wire is wound around the surface of the columnar structure. Reinforcement method. 2. A method for reinforcing a columnar structure according to claim 1, wherein the reinforcing wire is wound around the surface of the columnar structure at a set pitch while applying a set tension to the reinforcing wire from the rotary drum. . 3. A plurality of guide posts erected around the columnar structure, an elevating device suspended from the guide posts, a fixed frame fixed to the elevating device and surrounding the columnar structure. A reinforcing wire winding device for a columnar structure, comprising: a rotating drum rotatably mounted on a fixed frame to feed out a reinforcing wire; and a rotary driving device provided in the elevating device to rotate the rotating drum. 4. The apparatus according to claim 3, further comprising a control device for setting and controlling a lifting speed of the lifting device, a rotation speed of the rotary driving device, and a tension of the reinforcement wire. Reinforcing wire rod winding device for columnar structures.