Reinforcement spacers

Abstract

This invention provides a reinforcement spacer that can also function as a shear reinforcement without requiring the effort of bending and molding or applying rust-preventive paint. [Solution] A reinforcement spacer 1 supports a reinforcement RL which is formed by creating a grid of vertical reinforcements RL1 and horizontal reinforcements RL2 intersecting thereto, comprising a base 11 having a thickness greater than or equal to the required concrete cover thickness, and a pair of fiber-reinforced resin rods 2A, 2B erected on the base 11 at a predetermined interval and parallel to each other, and the vertical reinforcements RL1 and horizontal reinforcements RL2 are held by being sandwiched between the rods (2A, 2B) from both sides at the intersection RLX.

Description

Technical Field

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[0005]

[0001] The present invention relates to a spacer for reinforcement, and particularly to a spacer for reinforcement that can be suitably used for concrete reinforcement composed of fiber-reinforced resin reinforcing bars.

Background Art

[0002] As a reinforcing bar for concrete reinforcement, attention has been paid to those using basalt fibers that do not rust and can maintain the strength of concrete for a long time (for example, Patent Document 1). On the other hand, spacers are used to ensure the cover thickness of concrete reinforcement. Conventionally, waste plastic blocks as shown in Patent Document 2 and those formed by bending iron wire rods as shown in Patent Document 3 are known. 。

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, it is difficult to form a block-shaped spacer to connect between parallel reinforcements and impart the function as a shear reinforcement. On the other hand, although it is possible to impart the function as a shear reinforcement to the one formed by bending an iron wire rod, there is a problem that it requires labor for bending and rust prevention painting.

[0005] Therefore, the present invention solves such problems, and an object thereof is to provide a spacer for reinforcement that can impart the function as a shear reinforcement without requiring labor for bending and rust prevention painting. [Means for solving the problem]

[0006] To achieve the above objective, the first invention provides a reinforcement spacer (1) for supporting a reinforcement arrangement (RL) which is formed by creating a grid of vertical reinforcements (RL1) and intersecting horizontal reinforcements (RL2), comprising a base (11) having a thickness greater than or equal to the required concrete cover thickness, and a pair of fiber-reinforced resin rods (2A, 2B) erected parallel to each other at a predetermined interval on the base (11), wherein the vertical reinforcements (RL1) and the horizontal reinforcements (RL2) are held by being sandwiched between the rods (2A, 2B) from both sides at the intersection (RLX) of the vertical reinforcements (RL1) and the horizontal reinforcements (RL2).

[0007] According to this first invention, there is no need for the effort of bending and molding or rust-preventive painting.

[0008] In this second invention, the reinforcement consists of an upper reinforcement (RU) and a lower reinforcement (RL) separated by a predetermined distance vertically. The lower reinforcement (RL) has its intersection (RLX) positioned on the base (11), and the vertical reinforcement (RL1) and the horizontal reinforcement (RL2) are held at the intersection (RLX) by the rods (2A, 2B) on both sides. The upper reinforcement (RU) has its intersection (RUX) positioned at the upper end of the rods (2A, 2B), and the vertical reinforcement (RU1) and the horizontal reinforcement (RU2) are held at the intersection (RUX) by the rods (2A, 2B) on both sides.

[0009] According to this second invention, the rod connecting the upper and lower reinforcement bars functions as a shear reinforcement bar.

[0010] In this third invention, a receiving member (12) is provided at the upper end of the rod body (2A, 2B), and the intersection (RUX) of the upper reinforcement (RU) is positioned on the receiving member (12).

[0011] According to this third invention, the intersection of the upper reinforcement bars is easily and reliably supported by the receiving member.

[0012] In this fourth invention, the base (11) is made of tile material.

[0013] According to this fourth invention, the durability of the base can be improved.

[0014] In this fifth invention, the base (3A) and the receiving member (3B) are made into identical, downwardly open box-shaped bodies, the height of the peripheral wall (31) of the box-shaped body is set to be greater than or equal to the concrete cover thickness, and a hole (37, 38) of a size that allows aggregate contained in the poured concrete to pass through is provided in a part of the top wall of the box-shaped body.

[0015] According to this fifth invention, the base and the receiving member are made of the same shape, thus reducing the effort required for manufacturing. In addition, since an opening large enough for aggregate to pass through is provided in the top wall of the box, the poured concrete, including the aggregate, passes through the opening and enters the inner space of the box, thus avoiding the creation of unnecessary voids in the concrete.

[0016] In this sixth invention, spiral grooves are formed on the outer circumference of the rod bodies (2A, 2B) to form ribs (21).

[0017] According to the sixth invention, the presence of ribs ensures that the longitudinal and transverse reinforcements are reliably positioned without slipping at their intersections.

[0018] The symbols in parentheses above are for reference only, indicating the correspondence with the specific means described in the embodiments described later. [Effects of the Invention]

[0019] As described above, the reinforcement spacer of the present invention can provide the function of shear reinforcement without requiring the effort of bending and molding or rust-preventive painting. [Brief explanation of the drawing]

[0020] [Figure 1] This is a perspective view of a reinforcement spacer installed between upper and lower reinforcement bars in a first embodiment of the present invention. [Figure 2] This is an overall side view of the reinforcement spacer. [Figure 3]It is a cross-sectional view taken along line III-III of FIG. 2. [Figure 4] It is a perspective view of the reinforcement spacer in the second embodiment of the present invention. [Figure 5] It is a plan view of the base seen from below. [Figure 6] It is a cross-sectional view taken along line VI-VI of FIG. 5. [Figure 7] It is a cross-sectional view taken along line VII-VII of FIG. 5.

Mode for Carrying Out the Invention

[0021] Note that the embodiments described below are merely examples, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

[0022] (First Embodiment) FIG. 1 shows a reinforcement spacer 1 installed between upper and lower reinforcements RU and RL. In the present embodiment, the upper and lower reinforcements RU and RL are formed in a rectangular lattice shape by orthogonally arranging longitudinal reinforcements RU1 and RL1 and transverse reinforcements RU2 and RL2 made of fiber-reinforced resin, and are spaced apart vertically at a predetermined interval and are parallel to each other. The reinforcement spacer 1 is installed so as to connect the corresponding intersection portions RUX and RLX of the upper and lower reinforcements RU and RL.

[0023] FIG. 2 shows an overall side view of the reinforcement spacer 1, and FIG. 3 shows a cross-sectional view taken along line III-III of FIG. 2. The reinforcement spacer 1 includes a thick-plate-shaped rectangular base 11, and the base 11 is located on the floor surface F (FIG. 2) of the waste concrete. The thickness dimension D of the base 11 is intended to ensure the cover thickness of the placed concrete. A tile material such as unglazed tile can be preferably used for the base 11. This is because the tile material does not form voids inside and is more durable than the concrete that has been widely used in conventional reinforcement spacers.

[0024] As shown in Figure 3, a pair of circular through holes 111 are formed in the base 11 at predetermined intervals along one diagonal of the plate surface, and the lower ends of the round rods 2A and 2B are inserted into and fixed to these through holes 111, respectively. The round rods 2A and 2B are made of fiber-reinforced resin, and in this embodiment they are made of the same material as the vertical reinforcements RU1 and RL1 and the horizontal reinforcements RU2 and RL2 that constitute the reinforcement RU and RL. That is, the round rods 2A and 2B are made using reinforcing bars manufactured by the method shown in Patent Document 1, in which basalt fibers are impregnated with polypropylene (PP) resin and a PP resin film is tightly wrapped around their outer circumference. In this embodiment, spiral grooves are formed on the outer circumference of the round rods 2A and 2B to form ribs 21. In this embodiment, similar ribs are also formed on the vertical reinforcements RU1 and RL1 and the horizontal reinforcements RU2 and RL2.

[0025] The fiber-reinforced resin rods 2A and 2B, each with ribs formed on its outer circumference, extend parallel to each other upward. As shown in Figure 1, rectangular plate-shaped receiving members 12, identical in shape to the base 11, are attached to the upper ends of these rods 2A and 2B. Specifically, the receiving member 12 also has a pair of circular through-holes in the plate surface corresponding to the base 11, and the upper ends of each rod 2A and 2B are inserted through these through-holes to attach the receiving member 12. The material of the receiving member 12 can be wood or any other plate-shaped material.

[0026] In the lower reinforcement RL, at the intersection RLX on the base 11 where the vertical reinforcement RL1 and the horizontal reinforcement RL2 intersect perpendicularly, as shown in Figure 3, the vertical reinforcement RL1 and the horizontal reinforcement RL2 are held and positioned by a pair of round rods 2A and 2B on the base 11 from diagonally opposite sides. In this case, the round rods 2A and 2B have ribs formed on their outer circumference, and the vertical reinforcement RL1 and the horizontal reinforcement RL2 also have ribs formed on their outer circumference. Therefore, when held between the round rods 2A and 2B, their ribs interlock, ensuring secure positioning at the intersection RLX without slipping. A similar holding structure is also realized at the intersection RUX of the vertical reinforcement RU1 and the horizontal reinforcement RU2 of the upper reinforcement RU located on the receiving member 12, ensuring secure positioning there as well.

[0027] Here, the pair of upright round rods 2A and 2B use the reinforcing bars described above, so their tensile strength is sufficiently large, and they also function as shear reinforcement by connecting the upper reinforcement RU and the lower reinforcement RL.

[0028] In this way, by using the reinforcement spacer 1 of the present invention, a reinforcement structure for a concrete slab is realized that ensures the cover thickness from the floor surface F while maintaining the upper and lower reinforcements RU and RL at predetermined intervals.

[0029] (Second Embodiment) Another example of a reinforcement spacer is shown in Figure 4. Figure 4 is a perspective view of the reinforcement spacer 1 from above, and, like the first embodiment, it comprises a rectangular base 3A, a pair of round rods 2A and 2B erected thereon, and a rectangular receiving member 3B. In Figure 4, the base 3A and the receiving member 3B are depicted as being of different sizes, but in reality they are identical in shape and have the structure described below.

[0030] In this embodiment, the base 3A and the receiving member 3B are integrally molded products of polypropylene resin. However, they do not necessarily have to be integrally molded products of resin. The structure of the base 3A will be described below as an example. Figure 5 is a plan view of the base 3A seen from below, and Figures 6 and 7 are cross-sectional views along lines VI-VI and VII-VII in Figure 5, respectively.

[0031] The base 3A is a box-shaped structure with a rectangular perimeter wall 31 that opens downwards. The height of the perimeter wall 31 is such that it guarantees the concrete cover thickness. On the top wall 32 of the base 3A, two cylindrical holes 33 and 34 are formed at intervals from each other in the center of one diagonal direction, and are the same height as the perimeter wall 31, pointing downwards. Between these cylindrical holes 33 and 34, a cylindrical wall 35 is formed in the center of the top wall 32, projecting downwards and being the same height as the perimeter wall 31, with a closed end. A mounting hole 351 is opened in the center of the closed end face of the cylindrical wall 35.

[0032] The top wall 32 of the base 3A has oval-shaped holes 37 and 38 formed on the outer circumference in the opposite diagonal direction. The holes 37 and 38 do not necessarily have to be oval-shaped, but their size should be large enough for the aggregate contained in the poured concrete to pass through. The same structure applies to the receiving member 3B, and the same reference numerals are used for the same parts.

[0033] The reinforcement spacer 1 has its base 3A fixed to the concrete floor surface with anchor bolts through mounting holes 351 at the tip of the cylindrical wall 35, and the lower ends of the round rods 2A and 2B, similar to those in the first embodiment, are inserted into the cylindrical holes 351 and fixed. Then, the cylindrical holes 33 and 34 of the receiving member 3B are inserted into the upper ends of the round rods 2A and 2B, and the receiving member 3B is attached to the upper ends (as shown in Figure 1). Note that the mounting holes 351 of the receiving member 3B are not used.

[0034] Similar to the first embodiment, the vertical reinforcement RL1 and horizontal reinforcement RL2 of the lower reinforcement RL, and the vertical reinforcement RU1 and horizontal reinforcement RU2 of the upper reinforcement RU, are held in place by the round rods 2A and 2B at their intersections RLX and RUX on the base 3A and the receiving member 3B, respectively. When concrete is poured in this state, the concrete, including the aggregate, passes through the holes 37 and 38 and enters the internal space of the box-shaped base 3A and receiving member 3B, so no unnecessary voids are created. In this embodiment, the base 3A and the receiving member 3B are made of the same shape and manufactured by integral molding of resin, thus reducing manufacturing costs.

[0035] (Other embodiments) Furthermore, it is not always necessary to use support members 12 and 3B to hold and position the intersection RUX of the vertical reinforcement RU1 and horizontal reinforcement RU2 of the upper reinforcement RU; the intersection RUX may be held and positioned using wire or the like. Furthermore, rods 2A and 2B are not limited to round rods. Furthermore, the vertical reinforcements RU1, RL1 and horizontal reinforcements RU2, RL2 in the upper and lower reinforcement RU and RL may also be steel bars. Furthermore, this invention is also valid even when there is no upper reinforcement RU. [Explanation of symbols]

[0036] 1... Spacer for reinforcement, 11... Base, 12... Support member, 2A, 2B... Rod body, 21... Rib, 3A... Base, 3B... Support member, 31... Peripheral wall, 37, 38... Hole, RL... Lower reinforcement, RL1... Vertical reinforcement, RL2... Horizontal reinforcement, RLX... Intersection, RU... Upper reinforcement, RU1... Vertical reinforcement, RU2... Horizontal reinforcement, RUX... Intersection.

Claims

1. A reinforcing spacer for supporting a reinforcing arrangement that forms a grid with vertical bars and intersecting horizontal bars, comprising a base having a thickness greater than or equal to the required concrete cover thickness, and a pair of fiber-reinforced resin rods erected parallel to each other at predetermined intervals on the base, wherein the vertical bars and horizontal bars are held by the rods from both sides at their intersections.

2. The reinforcement spacer according to claim 1, wherein the reinforcement arrangement consists of an upper reinforcement and a lower reinforcement separated by a predetermined distance vertically, the lower reinforcement having its intersection positioned on the base, with the vertical and horizontal reinforcements being held at the intersection by the rod from both sides, and the upper reinforcement having its intersection positioned at the upper end of the rod, with the vertical and horizontal reinforcements being held at the intersection by the rod from both sides.

3. The reinforcement spacer according to claim 2, wherein a receiving member is provided at the upper end of the rod body and the intersection of the upper reinforcement is positioned on the receiving member.

4. The reinforcement spacer according to claim 1, wherein the base is made of tile material.

5. The reinforcement spacer according to claim 4, wherein the base and the receiving member are identical in shape and open at the bottom, the height of the peripheral wall of the box is greater than or equal to the concrete cover thickness, and a hole of a size that allows aggregate contained in the poured concrete to pass through is provided in a part of the top wall of the box.

6. The reinforcement spacer according to claim 1, wherein spiral grooves are formed on the outer circumference of the rod body to form a rib.

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