JPH0543068Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a reinforcing core material inserted into concrete instead of reinforcing bars, and a frame using the same.

<Prior Art> Concrete buildings are generally reinforced by placing reinforcing bars in the concrete.

Conventionally, sand and pebbles collected from rivers were used as aggregate for concrete, but in recent years, it has become increasingly difficult to collect sand and pebbles from rivers, so sand collected from the sea ( Sea sand) and pebbles are increasingly being used as aggregates.

<Problem that the invention aims to solve> If sand and pebbles collected from the sea are used as concrete aggregates, the salt adhering to the sand and pebbles will corrode the reinforcing bars, causing them to lose their function as reinforcing materials. Salt adhering to sand and pebbles can be removed by washing with water, but it is difficult to completely remove salt.
It takes a lot of time and effort.

Furthermore, in concrete structures such as tetrapods and harbor buildings that are exposed to seawater, the reinforcing bars corrode over many years due to salt from the seawater that has seeped into the interior.

Therefore, it has been desired to develop a core material for reinforcing concrete that has excellent corrosion resistance and strength.

<Means for solving the problem> The present invention was proposed in view of the above, and consists of thick diameter parts at appropriate intervals along the length of a plastic bar with reinforcing fibers arranged inside it in the length direction. By forming multiple pieces, a core material for concrete reinforcement was constructed.

It is a plastic rod material with reinforcing fibers arranged inside it in the length direction, and has a plurality of core materials in which a plurality of thick diameter parts are formed at appropriate intervals in the middle of the length, and a core material that intersects with these core materials. A frame for reinforcing concrete was constructed by a holder that was elongated in the longitudinal direction and had a plurality of fitting recesses formed in the longitudinal direction on the side surface into which the large diameter portion could fit.

<Function> The reinforcing fibers arranged longitudinally inside the core material exert a strong tensile force, and as a result, even though the core material is made of plastic, it exhibits sufficient strength as a core material for concrete reinforcement. Therefore, the addition of this core material improves the strength of concrete, especially its tensile strength.

Furthermore, since the core material is made of plastic, it will not corrode even if it is immersed in seawater, and will not generate an induced current even if it is subjected to magnetism.

Furthermore, when the frame is constructed by fitting the large diameter portion of the core material into the fitting recess of the holder, the plurality of core materials can be held at appropriate intervals.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

As shown in Fig. 1, the core material 1 for concrete reinforcement is a round bar made of fiber reinforced plastic (FRP), which has reinforcing fibers 2 arranged inside it in the length direction to increase its strength. A plurality of large diameter portions 3 are formed at appropriate intervals in the middle of the tube.

The reinforcing fibers 2 may be of any type as long as they have strong tensile strength, such as carbon fibers, glass fibers, graphite fibers, etc. Carbon fiber can be used as a strong core material because it has twice the tensile strength of high-strength steel and six times the stiffness of glass fiber. The plastic to be integrated with the reinforcing fibers 2 may be polyester resin, phenol resin, amino resin, silicone resin, epoxy resin, or the like.

The large diameter portions 3 may have any shape as long as they are thicker than other portions of the core material 1, and may be spherical as in the embodiment shown in FIG. In addition, this large diameter portion 3...
Although the intervals at which they are formed can be set as appropriate, it is desirable that they be approximately equal intervals.

The holder 4 for holding the core material 1 described above is a long elastic member in which a plurality of fitting recesses 5 into which the large diameter portions 3 of the core material 1 can be fitted are formed, as shown in FIG. What is shown is a plastic bar with a rectangular cross section, on one side of which a fitting recess 5 whose opening width is slightly narrower than the diameter of the large diameter part 3 and which can accommodate the large diameter part 3 is formed in a predetermined manner. Five pieces are formed at intervals. The fitting recess 5 may have any structure as long as it can fit the large diameter portion 3 of the core material 1, and may have a short groove shape with a partially cut-off circular cross section as shown in the drawing. . Moreover, if the large diameter portion 3 is spherical, the fitting recess 5
The inner surface of the core material 1 may be formed into a substantially spherical surface so that the large diameter portion 3 does not move in the axial direction of the core material 1.

When manufacturing this holder 4, as shown in FIG. 4, a plate having groove-shaped fitting recesses 5 is formed by extrusion molding, and this plate is shaped into a thin bar as shown by the dashed line in FIG. It may also be cut. If holder 4 is created in this way, it can be mass-produced, but
The fitting recesses 5 are limited to groove shapes.

In order to assemble a frame 6 for reinforcing concrete using the core materials 1 and the holder 4 having the above-mentioned configuration, as shown in FIG. ... are arranged almost in parallel, and the heights of the large diameter portions 3 ... of each core material 1 are made equal,
The holder 4 is applied almost perpendicularly to these core materials 1. Then, the large diameter portions 3 of each core material 1 are pushed into the fitting recesses 5 of the holder 4 and fitted. Note that when the large diameter portion 3 is strongly pressed against the opening of the fitting recess 5 of the holder 4, the elasticity of the holder 4 deforms both sides of the fitting recess 5 slightly outward, opening the opening. The large diameter portion 3 fits into the fitting recess 5, but once the large diameter portion 3 fits into the fitting recess 5, both sides of the fitting recess 5 are restored by elasticity and the opening is closed. Since the width returns to its original size, the large diameter portion 3 will not easily come off. Therefore, the core materials 1 are held at intervals between the fitting recesses 5 of the holder 4.

It should be noted that the holders 4 do not need to be attached to each stage of the large diameter portions 3 having the same height, and may be attached at appropriate intervals as long as a predetermined number of core materials 1 can be held. In addition, it is desirable to fit the large diameter portion 3 of the core material 1 into the fitting recess 5 of the holder 4, but the size of the fitting recess 5 is determined by adjusting the size of the core material 1 other than the large diameter portion 3. When formed to correspond to the thickness of , parts other than the large diameter part 3 can be fitted. If you do it like this,
There is no need to align the large diameter portions 3 of the core material 1 arranged in parallel.

When concrete is poured into the concrete pouring frame 7 using the frame 6 as a reinforcing material, the concrete, which is still a fluid, surrounds each core material 1 and the holder 4 and comes into close contact with them. Therefore, after the concrete has cured, each core material 1 functions as a reinforcing material similar to a reinforcing bar, increasing the strength of the concrete, especially the tensile strength. Note that the core material 1 is formed with a plurality of large diameter portions 3, and these large diameter portions 3 are engaged with the concrete after curing, so that there is no misalignment between the concrete and the core material 1. It will never occur.

Note that the holder 4 in the present invention is not limited to the one described above, and may have any configuration as long as it can hold a plurality of core materials 1. For example, the holder 4 shown in FIG. 6 holds core members 1a and 1b arranged substantially perpendicular to the horizontal direction, and has a first fitting recess 5a facing upward on the upper surface and a second fitting recess 5a on the lower surface. 5b faces downward, and the directions of the first fitting recess 5a and the second fitting recess 5b are shifted in phase by approximately 90 degrees. This holder 4 holds two core members 1a and 1b that are substantially perpendicular to each other, and the directions of the first fitting recess 5a and the second fitting recess 5b are appropriately set to 45 degrees, 60 degrees, etc. Then, the core materials 1a and 1b that intersect at a desired angle can be connected. Further, as shown in FIG. 7, the holder 4 is formed into a cross shape, with a plurality of upward fitting recesses 5a on one side and a plurality of downward fitting recesses 5 on the other side.
b... may be formed so that a large number of intersecting core materials 1... can be held.

In addition, in order to join the intersecting core materials 1, 1, the holder 4 may not be used, and the core materials 1, 1 may be bonded with an adhesive or bound with stainless steel wire.

<Effects of the invention> As explained above, according to the invention, the core material will not corrode even if the aggregate such as sand or pebbles in concrete contains salt. Therefore, it can be used as a reinforcing material for concrete using sea sand, which is easy to collect, and the core material can maintain its reinforcing function semi-permanently.

Further, even though the core material according to the present invention is made of plastic, it is reinforced with reinforcing fibers, so it can exhibit strength as strong as conventional reinforcing bars.

Therefore, the present invention is most suitable as a core material for concrete reinforcement of tetrapods, port structures, seawall structures, etc.

Furthermore, since the core material according to the present invention and the frame using the same do not contain any magnetic material, they can be safely used in concrete structures that are subject to strong magnetism, such as the tracks of linear motor cars.

As described above, the present invention has an extremely wide range of application and high practical value.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of the core material, FIG. 2 is an enlarged view of the large diameter part of the core material,
Fig. 3 is a cross-sectional view of the holder, Fig. 4 is a perspective view of the extruded holder, Fig. 5 is a perspective view of the frame holding five core members in the holder, and Figs. 6 and 7 are the holder. FIG. 7 is a perspective view of another embodiment. In the figure, 1 is the core material, 2 is the reinforcing fiber, 3 is the large diameter part,
4 is a holder, 5 is a fitting recess, and 6 is a frame.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Concrete reinforcement made of a plastic bar with reinforcing fibers arranged inside it in the length direction, with a plurality of thick diameter parts formed at appropriate intervals along the length. Core material for. (2) A plastic bar with reinforcing fibers arranged inside it in the length direction, including a plurality of core materials in which a plurality of thick diameter parts are formed at appropriate intervals in the middle of the length, and a core material that crosses these core materials. A frame for reinforcing concrete comprising a holder that is elongated in the direction of the holder and has a plurality of fitting recesses formed in the longitudinal direction on the side surface into which the large diameter portion can fit.