JPH01203551A - concrete reinforcement members - Google Patents

Abstract

PURPOSE:To secure settlement of concrete in the longitudinal direction of a principal member, by providing anchor members perpendicularly to the principal member at fixed intervals along the longitudinal direction of the principal member extending in one direction. CONSTITUTION:A concrete reinforcing member comprises a principal member 2a extending in one direction, and a plurality of anchor members 2b, each extending in the direction perpendicular to the principal member 2a. The principal member 2a and the anchor members 2b are respectively made of fiber bundles 4, which are constructed of a plurality of continuous fibers 3 bound into bundles with resin materials 5. The continuous fibers 3 are fixed together with equally spaced pitches to form the fiber bundles. At crossing points 6 of the fiber bundles 4, the fiber bundles 4 show a cross sectional figure, where a group of continuous fibers 3a extending in one direction, and another group of continuous fibers 3b extending in another direction crossing the continuous fibers 3a at right angles are laminated in more than three layers.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a concrete reinforcing member suitably used as a substitute for reinforcing reinforcing bars etc. buried in various concrete structures.

“Conventional technology and its problems” So-called fiber reinforced plastics (hereinafter simply [FRPJ
) has the characteristics of being lightweight, having high specific strength, excellent corrosion resistance, good moldability, and a high degree of freedom in shape, and is used in various structural materials. In recent years, various studies have been conducted to take advantage of the above characteristics and assemble rod-shaped FRP members into a desired shape to form concrete reinforcement members as a substitute for reinforcing reinforcing bars etc. buried in various concrete structures.

When using rod-shaped FRP members as a substitute material for reinforcing bars buried in concrete structures, one of the issues to be considered is improving the adhesion between concrete and FRP members. For this reason, the conventionally proposed rod-shaped FR
Like conventional deformed reinforcing bars, the P member has knot-like protrusions on its surface to improve adhesion to concrete (for example, Japanese Patent Laid-Open No. 61-274036, Utility Model Laid-open No. 62-14).
0115, etc.). However, the conventional FRP
For parts, protrusions were formed by forming a rod-shaped member and then winding continuous fibers impregnated with resin around the outer periphery of the rod-shaped member, which increased the number of steps and was not suitable for mass production. Moreover, there was a possibility that the integrity of the rod-shaped member and the protrusion could not be ensured.

``Means for Solving the Problems'' Therefore, the present invention provides a concrete reinforcing member to be buried in a concrete structure, which includes a main member formed by extending resin-impregnated continuous fibers in one direction, and a main member formed by extending resin-impregnated continuous fibers in one direction. an anchor member made of resin-impregnated continuous fibers that intersect at intervals in the longitudinal direction of the main member, and the continuous fibers forming these It is characterized by having a cross-sectional shape in which three or more layers are alternately laminated.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 are diagrams showing concrete reinforcing bars (reinforcing members) that are one embodiment of the present invention. In these figures, the symbol l indicates the entire concrete reinforcing bar, and this reinforcing bar 1 is an axial bar extending in one direction (
It is composed of a main member) 2a and a plurality of anchor bars (anchor members) 2b extending in a direction perpendicular to the main member. These axial reinforcements 2a and anchor reinforcements 2b each consist of a plurality of continuous fibers 3 bound together with a resin material 5 (this continuous fiber 3 itself is actually composed of a plurality of continuous fibers).
The fiber bundles 4 are made of fiber bundles 4, and these are fixedly molded at equal pitches (for example, 10 cm). That is, as shown in FIGS. 1 to 3, this reinforcing bar 1 consists of a plurality of continuous fibers 13 (second
The fiber bundles 4 made of fibers (see figure) intersect to form a cross shape, and each fiber 3 of the fiber bundles 4 is bound by a resin material 5.

Further, as shown in FIG. 3, the intersection 6 between the fiber bundles 4 is composed of three or more layers of fiber groups 3a extending in one direction and fiber groups 3b extending in the other direction perpendicular to this. In the illustrated example, the cross-sectional shape is formed by laminating 16 layers. and,
The reinforcing bars 1 are formed into a so-called cruciform shape having the same thickness and no steps as a whole. Note that the surface of the reinforcing bar 1 may be formed into a rough surface by active means described below.

The continuous fibers 3 that form the main part of the reinforcing bars 1 are preferably lightweight and high strength glass fibers, carbon fibers, aramid fibers, etc., but if necessary, other fibers such as synthetic resin fibers, ceramic fibers, Metal fibers or the like may also be used.

Further, these fibers may be used in a suitable combination.

Further, as the resin material 5 for binding the continuous fibers 3 of the fiber bundle 4, for example, vinyl ester resin, which has good adhesiveness to the continuous fibers 3 and has sufficient strength properties by itself, is suitable. Other resin materials may be used depending on the type of fiber 3 to be used. Examples of other resin materials include unsaturated polyester resins, epoxy resins, and phenolic resins.

Regarding the ratio of the continuous fibers 3 and the resin material 5, the fibers 3
It is determined appropriately by considering the type and strength of the reinforcing bars 1, as well as the usage form of the reinforcing bars 1. For example, if the continuous fibers 3 are glass fibers and the resin material 5 is vinyl ester resin, the volume ratio of the continuous fibers 3 is If the continuous fiber 3 is pitch-based carbon fiber, for example, 2
It is desirable to consider it so that it is about θ to θθ%. If the proportion of continuous fibers 3 is less than the above, the strength of this reinforcing bar I will decrease significantly.On the other hand, if the proportion of continuous fibers 3 is increased, a reinforcing member with higher strength can be obtained, but if the proportion of continuous fibers 3 is too high, Therefore, relatively expensive materials such as carbon fibers are not preferred from the economic point of view.

According to the experimental results, the tensile strength of the fiber bundle 4 in which the volume ratio of glass fiber (fiber diameter 23 μm) to vinyl ester resin is 38% is 454 kg 7 mm, and the bending shear strength of the intersection 6 is 9/mm in 2θ
In addition, when the volume ratio of carbon fibers (fiber diameter βμm) is 2θ%, the tensile strength of the fiber bundle 4 is 20.4 kg/mm, and the bending shear strength of the intersection 6 is was / / kg/mm”.

The concrete reinforcing bars 1 having the above structure are manufactured using, for example, an apparatus as shown in FIGS. 4 and 5. First, to explain this device, in the same figure, reference numeral 11 is a reel in which continuous fibers 3, which constitute the axial reinforcement 2a, are impregnated with resin material 5 or wound around them, and reference numeral 12 is a reel in which the anchor reinforcement 2a is wound.
These reels are made by winding continuous fibers 3 impregnated with the resin material 5, which constitutes b, and each reel is prepared in groups of 4 rows and 4 stages, for a total of 16 reels.

The continuous fibers 3 pulled out from the reel 11 are aligned at regular intervals in the width direction by guide rollers 13, and then aligned at constant intervals in the height direction by guide rollers 14. The tip of the continuous fiber 3 is gripped by a gripper 16 and pulled in a certain direction (direction of arrow A in the figure).

On the other hand, the continuous fibers 3 pulled out from the reel 12 are aligned at regular intervals in the width direction by the guide roller 15, and then
The fibers pass through the guide rollers 13 and cross between the continuous fibers 3 drawn out from the reels 11 arranged at regular intervals only in the width direction.

Further, the continuous fibers 3 pulled out from the reel 12 are hooked on the pins 19 as appropriate, so that this crossing operation is performed in a reciprocating manner. After the continuous fibers 3 that should constitute the axial reinforcement 2a pass through the guide roller I4 and are arranged at regular intervals in the height direction, the entire fibers are pressurized from the upper side using a pressing plate or the like to increase the thickness. Finally, the continuous fibers 3 that are to form the anchor bars 2b are cut to a constant length by a surface plate 17 and a horizontally movable roller cutter 18 to form a cross shape as shown in FIG. A reinforcing bar 1 is obtained. Here, if the surface of the pressing plate is provided with unevenness in advance, the surface of the reinforcing bar 1 can be formed into a rough surface due to the unevenness.

In this way, it is possible to easily improve the adhesion of the reinforcing bars to concrete. In addition, reel 11
．． Continuous fibers 3 that are not impregnated with resin may be wound around the reel 12, respectively, and the continuous fibers 3 may be impregnated with the resin material 5 between the reel 11112 and the guide rollers 13 and 14.

Alternatively, continuous fibers such as pins 3 can be placed around the top surface of a rectangular surface plate.
The resin-impregnated continuous fibers 3 are sequentially hooked onto the corresponding jig vertically and horizontally in a so-called one-stroke manner, and a rectangular lattice-shaped FR is formed.
After forming the P member, by cutting it in one direction,
Reinforcement bars as shown in Figure 1! You can also get . At this time, the fiber groups should be arranged alternately in three or more layers at the intersections.

Further, it is necessary to apply sufficient tension to the continuous fibers 3 to maintain their linearity. Here, the continuous fibers 3 can of course be fed manually, but may also be automatically fed by mechanical means that operates based on a program in which the passing order is set in advance.

Therefore, the concrete reinforcement l with the above configuration is as follows:
Since the structure is such that the anchor bars 2b intersect with the axial bar 2a at predetermined intervals, the axial bar 2b intersects with the axial bar 2b, especially at the intersection 6 between the axial bar 2a and the anchor bar 2b.
It is possible to securely fix concrete in the axial direction of a.

Moreover, at this intersection 6, the continuous fibers 3 constituting the axial reinforcement 2a and the continuous fibers 3 constituting the anchor reinforcement 2b are alternately stacked and intersected, so the shear strength is high and the continuous fibers 3 constituting the anchor reinforcement 2b are intersected. It is possible to securely fix the material to the concrete without causing any unexpected situations.

Moreover, the concrete reinforcing bars 1 of this embodiment are the axial bars 2
A and the anchor reinforcement 2b can be integrally molded in the same process, and mass production can be performed without impairing the integrity of the shaft reinforcement 2a and the anchor reinforcement 2b. Furthermore, in the concrete reinforcing bars 1 of this embodiment, the axial bars 2a and the anchor bars 2b have a shape with no difference in level, and as a result, the concrete cover thickness can be made uniform, so that the wall portion can be relatively thin. It can be advantageously used as a reinforcing member for floor slabs, etc.

Note that this concrete reinforcing bar 1 may be used by being buried in a concrete structure to be constructed like a conventional reinforcing bar. or multiple reinforcement bars 1
Adjacent portions may be bound together using a binding iron wire or the like. In the case of bending, it is sufficient to use a thermoplastic resin as the resin material 5, soften it with a heating means such as a burner on site, and then bend it into a predetermined shape; no equivalent special equipment is required. do not. or,
Of course, it may be formed into a predetermined shape in advance at a factory or the like.

Further, in the illustrated example, a planar cross-shaped reinforcing bar l is described, but the present invention is not limited to this in any way, and any shape may be used depending on the required arrangement of reinforcing bars. It's fine if it's molded. For example, as shown in Figure 6,
The reinforcing bars 1 may be configured such that the anchor bars 2b intersect from a plurality of directions. In this case, if this reinforcing bar 1 is placed along a plane 20 such as the formwork surface, the end of the anchor bar 2b will be in contact with the plane 20, as shown in FIG. The stripes 2a are arranged at a predetermined distance (indicated by d in the figure) from this plane 20. Therefore, by appropriately selecting the length of the anchor reinforcement 2b, the distance d between the shaft reinforcement 2a and the plane 20 can be made equal to the concrete covering thickness and the road distance, and the anchor reinforcement 2b can serve as a so-called spacer. become. Note that the reinforcing bar 1 as shown in FIG. 5 can be produced by rotating the gripping tool 16 in the axial direction (in the direction of arrow B in the figure) in the manufacturing apparatus shown in FIGS. can be obtained by twisting between anchor bars 2b and 2b.

In addition, as shown in FIG. 8, in the manufacturing apparatus shown in FIGS. 3 and 4, the shape in which the continuous fibers 3 that constitute the anchor bars 2b are not trimmed, or the
As shown in the figure, the anchor reinforcement 2b may have a shape diagonally crossing the shaft reinforcement 2a. Note that the fibers 3 include twisted cords, braided cords, and the like.

"Effects of the Invention" As explained in detail above, according to the present invention, a concrete reinforcing member buried in a concrete structure is formed by forming continuous fibers impregnated with resin and extending in one direction. and an anchor member made of resin-impregnated continuous fibers that intersect at intervals in the longitudinal direction of the main member. It is possible to reliably fix concrete in the axial direction of the main member.

Moreover, since the continuous fibers constituting the main member and the continuous fibers constituting the anchor member are alternately laminated in three or more layers at this intersection, the shear strength at the intersection is high and there is no risk of accidental breakage. It is possible to securely fix the material to the concrete without causing any problems. Furthermore, the concrete reinforcing member of the present invention allows the main member and the anchor member constituting the member to be integrally molded in the same process, and can be mass-produced without impairing the integrity of the main member and the anchor member. Is possible.

[Brief explanation of the drawing]

1 to 3 are views showing a concrete reinforcing member that is an embodiment of the present invention, in which FIG. 1 is a perspective view showing the overall configuration, FIG. 2 is a sectional view of a straight portion of a fiber bundle, FIG. 3 is a sectional view of the intersection of fiber bundles, and FIGS. 4 and 5 are views showing an apparatus for manufacturing a concrete reinforcing member according to the above-mentioned embodiment, and FIG. 4 is a schematic plan view. , 5th
Figure 6 is a schematic front view of the same, Figures 6 and 7 are views showing concrete reinforcing members according to other embodiments of the present invention, in which Figure 6 is a perspective view, Figure 7 is a side view, and Figure 8 is a perspective view. No. 9
Each figure is a perspective view showing a concrete reinforcing member according to another embodiment of the present invention. l... Concrete reinforcement (member), 2a...
... Axial muscle (main member), 2b... Anchor muscle (anchor member), 3... Continuous fiber, 5...
...Resin material.

Claims (2)

[Claims] (1) A main member formed by extending continuous fibers impregnated with resin in one direction, and an anchor member made of continuous fibers impregnated with resin and intersected at intervals in the longitudinal direction of the main member. 2. A concrete reinforcing member comprising: and a cross section between the main member and the anchor member having a cross-sectional shape in which continuous fibers constituting the main member and the anchor member are alternately laminated in three or more layers. (2) The concrete reinforcing member according to claim 1, wherein the anchor member intersects with the main member from a plurality of directions.