JP2873198B2 - Method for reinforcing columnar structure and reinforcing wire winding device used therefor - Google Patents

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 and a reinforcing wire winding device used therefor, and more particularly, to a method for reinforcing a columnar structure such as a reinforced concrete pier, and a reinforcing wire used in the reinforcing method. And a device for winding the same around a columnar structure.

[0002]

2. Description of the Related Art When a pier used for a highway or a railway is damaged or deteriorated by a disaster such as an earthquake after construction, reinforcement work is required. Reinforcement work will also be required if there is a need to improve the strength due to a review of the seismic standards or the application of a larger load than the design standards.

Conventionally, as a method of reinforcing a pier, a method has been adopted in which a reinforcing bar is assembled on the outer periphery of a pier, the outer periphery is box-shaped around a steel plate, and concrete is poured into the inside of the steel plate box and solidified to be integrated. I have.

[0004]

In the above-mentioned conventional reinforcing method, many labor-intensive operations such as processing of a reinforcing bar and a steel plate, assembling and welding of a reinforcing bar and a steel plate on site are required. In particular, the work of assembling and welding a steel plate on the outer periphery of a bridge pier is an unstable work in the vertical direction, so that the work requires technology and is complicated. In addition, since reinforcing bars and steel plates are additionally arranged on the outer periphery of the original pier, the outer diameter of the pier after reinforcement is greatly increased. Since the texture of the concrete surface of the unreinforced pier and the steel surface of the reinforced pier also differ greatly, the appearance becomes extremely unbalanced and the appearance is impaired.

An object of the present invention is to easily reinforce a columnar structure such as a reinforced concrete pier with sufficient strength,
It is also to improve the appearance after reinforcement.

[0006]

[Means for Solving the Problems]

[Method of Reinforcing Columnar Structure] A method of reinforcing a columnar structure according to the present invention includes the steps of: tensioning a reinforcing wire made of a single PC wire around an outer periphery of the columnar structure and spirally winding the reinforcing wire; And covering the outer periphery of the columnar structure with a protective layer.

[0007] The columnar structure includes not only piers supporting bridges such as highways and railways, but also columnar structures forming various civil engineering and building structures. The columnar structure is generally applied to a structure made of reinforced concrete, but can also be applied to a columnar structure made of another material structure. As the columnar structure, a columnar structure, an elliptical columnar shape, an elliptical columnar shape, a columnar shape having other smooth curved sections, a polygonal columnar shape, or the like can be applied. The columnar structure can be applied to not only a vertical columnar shape but also an inclined columnar shape or a curved columnar shape. As the dimensions of the columnar structure, a radius of about 500 mm or more is adopted.

As a single wire of a PC wire used as a reinforcing wire, of the PC (prestressed concrete) wires conventionally used for manufacturing various prestressed concrete products, a single wire instead of a stranded wire is used.
PC wires are made of high tension and high strength rope material. The diameter of the PC wire single wire varies depending on conditions such as the shape and size of the columnar structure to be reinforced and the required degree of reinforcement, but is usually in the range of 4.0 to 6.0 mmφ.

The reinforcing wire is wound around the columnar structure under tension. The tension state is a state in which a tensile stress is generated in the reinforcing wire, and a compressive stress is generated in the columnar structure as a reaction force of the tensile stress generated in the reinforcing wire, and the durability against a load or an external force applied to the columnar structure is generated. Improve. The specific magnitude of the compressive stress or the tension may be substantially the same as the production conditions for ordinary prestressed concrete products.

The reinforcing wire is spirally wound around the outer peripheral surface of the columnar structure at a constant density interval. The higher the arrangement density of the reinforcing wires, the higher the reinforcing effect. As the reinforcing wire, only one reinforcing wire may be spirally wound, or a plurality of reinforcing wires may be arranged and spirally wound. It is also possible to spirally cross the reinforcing wires. The reinforcing wire may be wound over the entire length of the columnar structure,
It may be only partially wound only at the place where reinforcement is required. As for the speed of winding the reinforcing wire around the columnar structure, the higher the speed, the more efficiently the work can be performed, but the lower the speed, the more reliably the winding can be performed.

As the material of the protective layer, an outer wall finishing material, such as concrete, mortar or resin, which constitutes the outer wall surface of an ordinary civil engineering building can be used. The protective layer may be formed by laminating a plurality of layers made of different materials. The thickness of the protective layer only needs to be such that the reinforcing wire is buried so as not to be exposed to the outside and the appearance of the columnar structure can be improved, and a large mechanical strength that can bear the load applied to the columnar structure is not required.

A drawing die can be used in the step of winding the reinforcing wire. As the drawing die, a drawing die used for drawing a normal metal material can be used. The drawing die has a die hole having a diameter smaller than the outer diameter of the reinforcing wire. If the reinforcing wire is inserted into the die hole of the drawing die and the drawing die and the reinforcing wire are relatively moved, the outer diameter of the reinforcing wire can be reduced to the outer diameter corresponding to the diameter of the die hole. it can. The diameter of the drawing die is set in accordance with conditions such as the outer diameter of the reinforcing wire and the magnitude of the tension generated in the reinforcing wire. Specifically, a drawing die having a diameter of 85 to 90% of the outer diameter of the reinforcing wire is used.

[0013] By moving the drawing die inserted into the reinforcing wire with one end of the reinforcing wire fixed away from the fixing side of the reinforcing wire, the diameter of the reinforcing wire is reduced, and at the same time, the reinforcing wire is reduced. Will be strongly pulled between the fixed side and the position of the drawing die, and the reinforcing wire will be tensioned. In this state, if the reinforcing wire is spirally wound around the outer periphery of the columnar structure, the reinforcing wire can be wound around the outer peripheral surface of the columnar structure in a tensioned state. In addition, it is difficult to perform tensioning work at the same time as diameter reduction processing by such a drawing die unless a single wire is used as a reinforcing wire.

[Reinforcing Wire Winding Apparatus] The reinforcing wire winding apparatus according to the present invention is used in the above-described method for reinforcing a columnar structure, and includes a self-propelled carriage, a wire holding section, and a drawing die. The self-propelled trolley has spiral traveling means that can spirally move along the outer peripheral surface of the columnar structure. The spiral traveling means can be configured by combining traveling means of equipments employed in various civil engineering and construction machines and the like. The self-propelled trolley may run while being supported by the columnar structure itself, or may include a support means outside the columnar structure.

[0015] The spiral running means may be constituted by a combination of a circulating means for moving the self-propelled vehicle in the circumferential direction of the columnar structure and an axial moving means for moving the self-propelled vehicle in the axial direction of the columnar structure. it can. As long as the wire holding part temporarily holds the reinforcing wire wound around the columnar structure, various wire rod holding mechanisms can be employed. In addition to a winding reel that can hold the reinforcing wire in a wound state, the reinforcing wire may be held in a folded state. In a state where one end of the reinforcing wire is fixed to the outside of the self-propelled bogie, if the self-propelled bogie having the wire holding part performs a spiral motion along the outer peripheral surface of the columnar structure, the reinforcing wire of the wire holding part is sequentially pulled out. Around the outer peripheral surface of the columnar structure.

In order to fix one end of the reinforcing wire, one end of the reinforcing wire may be fixed to the outer peripheral surface of the columnar structure using a metal fitting such as a bolt. One end of the reinforcing wire may be fixed to the ground or the substructure on which the columnar structure is constructed. The drawing die is disposed in the passage of the reinforcing wire from the wire holding portion to the fixing point of the reinforcing wire. The reinforcing wire passes through the drawing die and is wound around the columnar structure. When the reinforcing wire passes through the drawing die, a large tensile force is applied to the reinforcing wire from the drawing die to the fixing point while performing the diameter reduction processing.

The spiral running means may include a circulating guideway, a lifting / lowering means, and a circulating means. The circulation guide path is arranged along the outer periphery of the columnar structure. The orbital guideway can be constructed by assembling a mold steel material, and the structure of a traveling path such as a normal crane, hoist, or conveyor can be adopted.

The lifting means moves along the orbital guideway,
Hang the self-propelled trolley and move it up and down. Specifically, elevating means, such as a hoist or a chain block, installed in various types of mechanical devices are employed. The elevating speed of the self-propelled carriage by the elevating means is set according to the winding speed of the reinforcing wire described above. The circling means can be provided on the self-propelled vehicle and can have a wound roller chain wound around the outer periphery of the columnar structure and a wound roller chain feeding means for feeding the wound roller chain from one side to the other. .

As the winding roller chain, the same chain as that used in various types of machinery is used. The wound roller chain can be flexibly deformed. Since the concavities and convexities of each chain link constituting the winding roller chain are tightened so as to bite into the columnar structure, the self-propelled carriage is supported on the columnar structure by securely abutting along the outer peripheral surface of the columnar structure. be able to. If the winding roller chain is fed from one side to the other by the winding roller chain feeding means mounted on the self-propelled carriage, the winding roller chain wound around the outer periphery of the columnar structure and frictionally supported is Since the self-propelled trolley moves relatively, the orbital motion of the self-propelled trolley is performed.

[0020]

FIG. 1 shows a method of reinforcing a columnar structure according to an embodiment of the present invention. A reinforcing wire winding device including a self-propelled carriage 10 and the like arranged on the outer periphery of the columnar structure 1 wraps the reinforcing wire 2 around the outer periphery of the columnar structure 1, and further covers the outer periphery with a protective layer 3.

As shown in FIG. 4, the columnar structure 1 constitutes a part of a pier B used for roads and railways. Pier B
Has a columnar structure 1 that stands vertically from the ground, and a horizontal arm b that extends in the left-right horizontal direction from the upper end of the columnar structure 1, and a bridge girder structure is constructed above the horizontal arm b. . [Reinforcing Wire Wrapping Apparatus] The reinforcing wire winding apparatus includes a circulating guide path 50 disposed at the upper part of the outer periphery of the columnar structure 1, hoists 40 and 42 running on the circulating guide path 50, and a hoist 4
It has a self-propelled carriage 10 suspended at 0,42.

As shown also in FIG.
It is made of a die steel material or the like, and is arranged in an annular shape along the outer periphery of the columnar structure 1. Although illustration is omitted in FIG. 1,
The orbital guideway 50 is supported on the ground or the upper structure of the pier B through a structure such as a steel material. The orbiting guideway 50 is divided into two semicircular portions, which facilitates disassembly, assembly, and transportation and storage.

A pair of hoists 4
The wheels 0 and 42 are mounted so as to be able to travel through the running wheels 46 and 46. Both hoists 40 and 42 are connected to both ends of one connection link 48 so as to be horizontally pivotable. The hoist 40 on one side is provided with a drive motor 47, and both hoists 40 and 42 are integrated with the
Drive on. As shown in FIG. 2, a trolley duct 52 for power supply is arranged along the inner periphery of the orbital guide path 50, and supplies drive power to the hoists 40 and 42. The driving power of the self-propelled trolley 10 can be supplied from the trolley duct 52 or a control signal of the self-propelled trolley 10 can be transmitted.

The frame 12 of the self-propelled carriage 10 is suspended from the lower end of a suspension chain 44 provided on the hoists 40 and 42 and capable of moving up and down. The self-propelled trolley 10 has a wire winding reel 22 mounted on a frame section 12 assembled from steel or the like. On the wire winding reel 22, P
A reinforcing wire 2 composed of a single C wire is wound and held. As the reinforcing wire 2, a single PC wire having an outer diameter of 4.0 to 6.0 mmφ is used, and the wire winding reel 22 can hold 600 kg of the reinforcing wire 2. Although not shown, the wire winding reel 22 is provided with a friction brake so that overrun of the wire winding reel 22 can be prevented.

The reinforcing wire 2 pulled out from the wire winding reel 22 is supplied to a drawing portion 30 through a plurality of guide rollers 24, 24, and the reinforcing wire 2 passing through the drawing portion 30 becomes a columnar structure 1 Wrapped around. The tip of the reinforcing wire 2 is connected to the lower end 21 of the columnar structure 1.
And are stopped by metal fittings such as bolts. As shown in FIGS. 2 and 3, the drawing portion 30 has a drawing die 32. The reinforcing wire 2 passing through the drawing die 32 is subjected to diameter reduction processing so that the outer diameter D ₀ before passing becomes the outer diameter D ₁ after passing. Introducing guide rollers 34, 34 are disposed on the rear end side of the drawing section 30.
The reinforcement wire 2 is smoothly introduced into the drawing die 32.

A plurality of running wheels 60 (a total of four at the top, bottom, left and right in the illustrated embodiment) are arranged at positions on the inner periphery of the frame portion 12 which contact the outer peripheral surface of the columnar structure 1. The traveling carriage 10 is movable in the circumferential direction with an integral interval with respect to the outer peripheral surface of the columnar structure 1. An endless winding roller chain 70 is wound around the outer peripheral surface of the columnar structure 1. The winding roller chain 70 sequentially meshes with a plurality of guide sprockets 72 and drive sprockets 73 included in the self-propelled carriage 10. The drive sprocket 73 is driven to rotate by a drive motor 74. By the rotation of the driving sprocket 73, the winding roller chain 70 is sent out from one end of the self-propelled vehicle 10 to the outer peripheral surface side of the columnar structure 1, and is pulled in from the other end of the self-propelled vehicle 10.

The guide sprocket 72a, which is located at a position symmetrical to the drive sprocket 73 of the guide sprocket 72, is movably installed in a direction away from the drive sprocket 73. By adjusting the position of the movable guide sprocket 72a, the tension of the winding roller chain 70, that is, the tightening force on the columnar structure 1 can be adjusted. In addition, the winding roller chain 70 adjusts the entire length of the winding roller chain 70 in accordance with the outer diameter of the columnar structure 1 by removing individual unit chain links, and attaches to and removes from the columnar structure 1. It can be performed.

The self-propelled carriage 10 is provided with a control panel 13 for electrically controlling the operation of the winding roller chain 70 and the like. [Reinforcing Method] A method for reinforcing a columnar structure using the above-described reinforcing wire winding device will be described in the order of steps.

First, a scaffold is assembled around the columnar structure 1 to be reinforced, and a circular guideway 50 is constructed. The hoists 40 and 42 and the self-propelled trolley 10 are suspended from the orbiting guideway 50. The winding roller chain 70 is wound around the outer periphery of the columnar structure 1 from the self-propelled carriage 10. Wire winding reel 2
2 is fixed to the outer peripheral surface of the columnar structure 1.

In this state, the winding roller chain 70 is driven. The wound roller chain 70 is sent out from the self-propelled carriage 10 and is retracted. The wound roller chain 70 is wound around the outer peripheral surface of the columnar structure 1, and is circumferentially moved by a frictional force with the columnar structure 1. Don't slip. Therefore, the self-propelled carriage 10 moves in the circumferential direction on the outer periphery of the columnar structure 1 without moving the winding roller chain 70. At this time, by moving the hoists 40 and 42 in the moving direction of the self-propelled vehicle 10, the self-propelled vehicle 10 smoothly orbits the outer peripheral surface of the columnar structure 1.

When the self-propelled trolley 10 goes around the outer periphery of the columnar structure 1, the reinforcing wire 2 having one end 21 fixed to the outer peripheral surface of the columnar structure 1 is sequentially pulled out from the wire winding reel 22. The reinforcing wire 2 drawn from the wire winding reel 22 passes through the drawing die 32. The diameter of the reinforcing wire 2 that has passed through the drawing die 32 is reduced. The pull-out resistance force when the reinforcing wire 2 is reduced in diameter is applied to the reinforcing wire 2 between the drawing die 32 and the fixing point 21.

As a result, the reinforcing wire 2 is wound around the outer peripheral surface of the columnar structure 1 in a state where a strong tensile force is applied. When the suspension chain 44 is lifted by the hoists 40 and 42 at the same time as the orbital movement of the self-propelled trolley 10, the self-propelled trolley 10 rises. That is, the self-propelled carriage 10
Rises while revolving around the outer peripheral surface of the columnar structure 1 and performs a so-called spiral motion. The winding position of the winding roller chain 70 around the columnar structure 1 gradually increases as the self-propelled carriage 10 rises. As shown in FIG. 1, the reinforcing wire 2 is fixed at a fixed point 2 at the lower end of the columnar structure 1.
From 1, it is spirally wound along the outer peripheral surface of the columnar structure 1. The winding speed of the reinforcing wire 2 is 2.
It can be adjusted in the range of 4 to 24 m / min. The lifting speed of the self-propelled carriage 10 can be adjusted within a range of 0.79 to 7.9 m / min. The tensile force applied to the reinforcing wire 2 is 1
It is set to about 000kg.

If the speed of the spiral movement of the self-propelled carriage 10 is kept constant, the reinforcing wire 2 is spirally wound around the outer periphery of the columnar structure 1 at a constant interval with a constant tension applied. As a result, a uniform tightening force is applied to the columnar structure 1 and uniform triaxial compressive stress is generated in the entire columnar structure 1. In this manner, the tension-reduced reinforcing wire 2 whose diameter has been reduced is spirally wound around the outer peripheral surface of the columnar structure 1, and then the rear end of the reinforcing wire 2 is fixed to the outer peripheral surface of the columnar structure 1. Then, the winding work of the reinforcing wire 2 is completed, and as shown in FIG.
Will be reinforced. In the reinforcing wire winding device of this embodiment, the maximum lifting distance of the self-propelled carriage 10 is 6 m.

After removing equipment such as the self-propelled trolley 10 from the periphery of the columnar structure 1, concrete is cast on the outer peripheral surface of the columnar structure 1 so as to cover the reinforcing wire 2, and the protective layer 3 is applied. . As long as the protective layer 3 covers the reinforcing wire 2 and can improve the appearance of the columnar structure 1, a relatively thin thickness is sufficient because the reinforcing effect is not so required. [Connection of Reinforcement Wire] When the reinforcement wire 2 held by the wire winding reel 22 becomes insufficient during the above-described reinforcement work, the reinforcement wire 2 is used by adding. Therefore, connecting means for the reinforcing wire 2 is required.

The connecting member 100 shown in FIG.
02. The cylindrical main body 102 has tapered holes 104, 104 that become thinner toward both ends. A connecting wedge 106 is disposed in the tapered hole 104, and the rear end is urged toward the front end by a coil spring 108. Fine uneven teeth are formed on the inner surface of the connecting wedge 106. Connecting wedge 1 of tapered hole 104 from the end of connecting tool 100
When the end of the reinforcing wire 2 is inserted into the center of the wire 06, the connecting wedge 106 urged by the coil spring 108 comes into contact with the outer peripheral surface of the reinforcing wire 2 so as to bite. In this state, when the reinforcing wire 2 is to be pulled out of the connecting tool 100, the connecting wedge 106 moves to the tip end side of the tapered hole 104, and the central space of the connecting wedge 106 becomes narrower. Are strongly bitten by the reinforcing wire 2 to prevent the reinforcing wire 2 from coming out.

Therefore, if the reinforcing wires 2 to be added are inserted into both ends of the connecting member 100, the reinforcing wires 2 on both sides are easily and firmly connected via the connecting member 100. Since the connecting tool 100 of the above embodiment has a cylindrical shape slightly larger than the outer diameter of the reinforcing wire 2, the reinforcing wire 2 connected by the connecting tool 100 is directly attached to the outer peripheral surface of the columnar structure 1. It is also possible to use by winding.

The connecting device 110 shown in FIG. 6 has two rectangular plates 112, 112 and fastening bolts 114 for tightening the rectangular plates 112, 112 so as to face each other. Square plate 1
Twelve facing surfaces have a pair of concave grooves 116,116.
The two square plates 112, 112 are made into one set, and two sets of square plates 112, 112 are used side by side. The two reinforcing wires 2 to be connected are sandwiched between the concave grooves 116 of the respective rectangular plates 112, 112, and the rectangular plates 112, 112 are tightened with the tightening bolts 114, whereby the reinforcing wires 2 are formed of the rectangular plates 112. It is fixed to the connector 110. That is, the reinforcing wires 2 on both sides are connected via the connecting tool 110.

[0038]

The method for reinforcing a columnar structure according to the present invention comprises:
A uniform reinforcing wire composed of a single PC wire is spirally wound around the outer periphery of the columnar structure in a tensioned state, so that a uniform triaxial compressive stress is generated in the columnar structure and the mechanical strength or proof stress of the columnar structure. Can be greatly improved.
In addition, since only a reinforcing wire and a protective layer covering the reinforcing wire are added to the outer periphery of the columnar structure, the outer diameter of the columnar structure does not greatly increase due to the reinforcement, and the appearance is hardly impaired.

The reinforcing wire winding device according to the present invention is configured such that when the reinforcing wire is wound around the outer peripheral surface of the columnar structure by a self-propelled bogie that performs a spiral motion on the outer peripheral surface of the columnar structure, the reinforcing wire is formed of a single PC wire. Is passed through the drawing die, a strong tensile force can be applied to the reinforcing wire that has passed through the drawing die. As a result, it is possible to strongly and efficiently reinforce the columnar structure with the reinforcing wire.

[Brief description of the drawings]

FIG. 1 is a front view of a construction state showing an embodiment of the present invention.

FIG. 2 is a horizontal cross-sectional view showing a part of a reinforcing wire winding device in the preceding figure, partially cut away.

FIG. 3 is an enlarged sectional view of a drawing die portion.

FIG. 4 is a schematic structural view showing the entire structure of a columnar structure.

FIG. 5 is a cross-sectional view illustrating a connecting tool for reinforcing wires.

FIG. 6 is a plan view (a) and a cross-sectional view (b) showing another embodiment of the connecting member of the reinforcing wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Columnar structure 2 Reinforcing wire 3 Protective layer 10 Self-propelled trolley 12 Frame part 22 Wire winding reel 24 Guide roller 30 Drawing part 32 Drawing die 34 Introducing guide rollers 40 and 42 Hoist 44 Hanging chain 46 Running ring part 48 Connection Link 50 circulating guideway 52 trolley duct 60 running wheel 70 wrapped roller chain 72 guide sprocket 74 drive motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) E01D 22/00 E01D 19/02 E04G 23/02

Claims (4)

(57) [Claims] 1. A drawing die is inserted into a reinforcing wire made of a single PC wire having one end fixed, and the drawing die is inserted into the reinforcing wire.
Move the chair away from the fixed side of the reinforcing wire.
And reduce the diameter of the reinforcing wire with the drawing die.
At the same time as tensioning the reinforcing wire so that the columnar structure
A method of reinforcing a columnar structure, comprising: a step of spirally winding the outer periphery of the columnar structure; and a step of covering the outer periphery of the columnar structure with a protective layer by embedding the reinforcing wire. 2. The method for reinforcing a columnar structure according to claim 1, wherein said coating step forms at least one of a concrete layer, a mortar layer and a resin layer as a protective layer. 3. A reinforcing wire winding device used in the winding step in the method for reinforcing a columnar structure according to claim 1 or 2 , wherein the device can be spirally moved along an outer peripheral surface of the columnar structure. A self-propelled trolley having spiral traveling means, a wire holding unit mounted on the self-propelled trolley and holding the reinforcing wire having one end fixed to the outside of the self-propelled trolley, A reinforcing wire winding device, comprising: a drawing die through which the reinforcing wire passes as the self-propelled truck travels. 4. A circulating guideway arranged along the outer periphery of the columnar structure, a spiral guide means, and an elevating means for moving along the circulatory guideway to suspend and lift the self-propelled vehicle. Circulating means, which is mounted on the self-propelled vehicle and has a wound roller chain wound around the outer periphery of the columnar structure and a wound roller chain feeding means for feeding the wound roller chain from one side to the other; The reinforcing wire winding device according to claim 3 , further comprising: