JP2689843B2 - CFRP reinforcing bar arrangement method and arrangement apparatus - 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 and apparatus for arranging CFRP reinforcing bars (carbon fiber reinforced plastic reinforcing bars) in a mold for forming a concrete slab.

[0002]

[Problems to be Solved by the Invention] When constructing a reinforced concrete slab, the reinforcing bars are reinforced, but it is difficult to secure the concrete cover due to the weight of the reinforcing bars.
It is necessary to arrange many spacers, which makes the setting work complicated. In addition, arranging heavy reinforcing bars at predetermined positions is a difficult task unless mechanization progresses.

The present invention has been made in view of the above circumstances. Its purpose is to propose a method and a bar arrangement device for efficiently arranging the CFRP reinforcing bar by using the CFRP reinforcing bar instead of the reinforcing bar.

[0004]

[Means for Solving the Problems] This CFRP reinforcing bar arrangement method is a method of assembling and confronting a mold having a rectangular shape in plan view with four molds each having a locking tool protruding from the inner surface as one set. While hooking the carbon fiber continuous yarn impregnated with the thermosetting resin between the frames, the zigzag bridging arrangement so as not to sag, and arranged, the carbon fiber continuous yarn is energized, The heat is used to cure the thermosetting resin to form CFRP reinforcing bars. According to another aspect of the present invention, there is provided a pair of X-direction guide rods, which are provided outside the facing pair of molds in parallel with the molds, and which ride on the X-direction guide rods in the X-direction. A movable Y-direction guide rod, a bobbin wound with a continuous carbon fiber yarn that rides on the Y-direction guide rod and is movable in the Y direction, and an up-and-down deflecting roller that pulls out and guides the continuous carbon fiber yarn. It is characterized by that.

Since the carbon fiber continuous yarn used in the present invention is electrically conductive and generates heat when energized, the thermosetting resin impregnated by energizing is cured to form CFRP (carbon fiber reinforced plastic), This CFRP becomes a reinforcing bar. As the thermosetting resin, epoxy resin or unsaturated polyester resin is used. The carbon fiber continuous yarn is used in either a non-twisted bundle or a twisted bundle. Usually, a continuous carbon fiber yarn in a so-called prepreg state, which is in a semi-dried state after impregnated with a thermosetting resin, is used. (Hereinafter, a carbon fiber continuous yarn impregnated with a thermosetting resin is abbreviated as a prepreg.) A metal terminal is attached to both ends and an intermediate part of the prepreg which is arranged so as to extend between the molds. An electric current is passed from the charging device to cure the thermosetting resin to obtain CFRP. The applied current may be direct current or alternating current.

[0006] This method and apparatus for arranging the precast,
It can be applied to the production of any cast-in-place concrete member.

[0007]

Example FIG. 1 (a) shows a steel form 1 for forming a concrete member reinforced by CFRP reinforcing bars, which is rectangular in plan view and has an open upper surface and four steel form 1 inner surfaces. Locking tools 2 are provided at predetermined intervals. The locking tool 2 is for hooking and bridging the prepreg, and it is preferable to use an insulator. The hooked portion has an arc shape or an elliptical arc shape, and its curvature is proportional to the thickness of the prepreg. This locking tool 2 is a screw 3 screwed from the outside of the formwork 1.
It is fixed and removable.

As shown in FIGS. 1 (b) and 1 (c), the prepreg 5 wound around the bobbin 4 is hooked alternately between the facing fasteners 2 and 2 in a zigzag shape in the form 1 as shown in FIGS. The other facing fasteners 2, 2 are alternately hooked and laid in a zigzag shape, and laid in zigzag in two orthogonal directions to arrange the bar. After finishing the arrangement of the two orthogonal directions for a given height level (such as the lower end bar and the upper end bar),
Electricity is applied from both ends of the prepreg 5 to generate heat to harden the prepreg 5 to form CFRP reinforcing bars 5 '. Concrete 6 is put into this mold, and after hardening, the mold 1 is demolded and a concrete member reinforced with CFRP reinforcing bars 5'is obtained. The locking tool 2 is removed from the formwork 1 and embedded in plastic concrete.

FIG. 3 shows a reinforcing bar apparatus according to an embodiment of claim 2 used in this reinforcing bar arrangement method. This apparatus has a horizontal formwork 1 having an open top surface, two parallel X-direction guide rods 7, 7 arranged outside the pair of facing formwork 1, and X-direction guide rods 7, 7 at both ends. It is provided with a Y-direction guide rod 8 which is movable in the X-direction and is orthogonal to the X-direction, and a bobbin 4 around which a prepreg 5 which rides on the Y-direction guide rod 8 and is movable in the Y-direction is wound. Therefore, the bobbin 4 can travel in the horizontal plane above the form 1 in both the X and Y directions.

The Y-direction guide rod 8 is provided with a set of four driving rollers 9 shown in FIG. 4 at both ends, and the X-direction guide rod 7 is sandwiched between the Y-direction guide rod 8 and the automatic traveling control device 10 for traveling in the X-direction. A set of four driving rollers similar to that shown in FIG.
9'and the automatic traveling control device 10 'are provided, and the vehicle travels in the Y direction with the Y-direction guide rod 8 interposed therebetween. Further, the deflection roller 1 for pulling out and guiding the prepreg 5 wound around the bobbin 4 is provided on the bobbin 4.
1, 11 are attached, and the height thereof is adjusted according to the height of the locking tool 2.

When this apparatus is used, the traveling of the bobbin 4 is automatically controlled in accordance with the pre-preg arrangement conditions inputted in advance to move the bobbin in the X and Y directions in the horizontal plane on the upper surface side of the formwork 1. The prepreg 5 wound around the bobbin 4 can be hooked on the locking tool 2 to span the bar arrangement. However, when arranging the same lower end streak, it is necessary to adjust the heights of the deflection rollers 11 and 11 in the middle when it is preferable to change the height levels in the X direction and the Y direction. Further, when the reinforcing bars are arranged in a plurality of height levels, it is naturally necessary to adjust the heights of the deflection rollers 11, 11 in accordance with the height levels.

The bar arrangement device shown in FIG. 6 automatically controls the height adjustment of the deflection rollers 11, 11.
In this apparatus, one lower deflecting roller 11 'of the deflecting roller 11 attached to the bobbin 4 of the apparatus shown in FIG. 5 can be moved up and down along a vertical guide rod 12 in the Z direction. The lower diverting roller 11 ′ is attached to a set of four driving rollers 9 that are sandwiched between the guide rods 12 and is provided with a traveling control device 10 to guide the prepreg 5 wound around the bobbin 4 up and down freely. Can be bridged.

[0013]

The present invention has the above-mentioned configuration. According to this CFRP reinforcing bar arrangement method, CFRP
Has a specific gravity as small as ⅕ and has a large strength as compared with a reinforcing bar, so that when it is used as a reinforcing bar with a predetermined strength, it is lightweight, and the workability is remarkably improved as compared with the reinforcing bar arranging work. When the CFRP reinforcing bar after heat curing is tried to be laid, it is not easy to bend it into a desired reinforced shape or to join it to obtain a desired length, but according to the reinforced method of the present invention, a flexible prepreg is provided. Can be laid across the formwork and changed to CFRP reinforcement after reinforcement, so that CFRP reinforcement having a desired shape and length can be easily arranged.

Since the bobbin wound with the prepreg can be freely moved within the horizontal plane of the upper surface of the mold, the bar arrangement device according to the second aspect provides a desired tension without giving viscous and unwieldy prepreg damage. Can be arranged across the bridge.

Therefore, this apparatus is effectively used for the construction of slabs and the production of flat concrete products.

[Brief description of the drawings]

FIG. 1 (a), (b), (c) is a perspective view showing a reinforcing bar method of an embodiment in the order of steps.

2 (a) and 2 (b) are a plan view and a vertical sectional view of a locking tool.

FIG. 3 is a perspective view of the bar arrangement device according to claim 2;

4 is an enlarged view of a Y-direction guide rod end portion of FIG.

FIG. 5 is an enlarged view of the bobbin portion of FIG.

FIG. 6 is an enlarged view of a bobbin portion of the bar arrangement device of claim 2;

[Explanation of symbols]

1 ... steel formwork, 2 ... locking tool, 3 ... screw, 4 ... bobbin, 5
... prepreg, 5 '... CFRP reinforcing bar, 6 ... concrete, 7 ... X-direction guide rod, 8 ... Y-direction guide rod, 9 ... drive roller, 10 ... automatic traveling control device, 11 ... deflection roller, 1
2 ... Z direction guide rod

Claims (2)

(57) [Claims] 1. A continuous carbon fiber in which a mold having a rectangular shape in plan view is assembled by using four molds each having a locking tool projecting on the inner surface, and a thermosetting resin is impregnated between the facing molds. While hooking the thread on the locking tool and arranging it in a zigzag manner so that it does not sag, the carbon fiber continuous thread is energized, and the heat is used to cure the thermosetting resin and CFRP reinforcement A method for arranging CFRP reinforcing muscles, which comprises using muscles. 2. A pair of two X-direction guide rods provided in parallel to the molds outside the pair of molds facing each other, and a Y-direction movable on the X-direction guide rods in the X-direction. A guide rod, a bobbin wound with a continuous carbon fiber yarn that is movable in the Y direction on the Y-direction guide rod, and a deflectable roller that pulls up and guides the continuous carbon fiber yarn. A CFRP reinforcing bar arrangement device for use in the reinforcement method according to claim 1.