JP2000145017A - Dowel bar, and semi precast concrete slab using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dowel bar which is small in amount of materials to be used as compared with those of a conventional one, easy in assembly, and low in manufacturing cost, and a PCa plate using the dowel bar. SOLUTION: A plurality of diagonal braces respectively comprising a pair of two diagonal bars 5a, 7a, 5b, 7b which are tapered downwardly in an inverted V-shape with part of one upper end bar 2 as top parts 6a, 6b, are arranged in the axial direction of the upper end bar 2, and a pair of diagonal braces adjacent to each other are connected to each other by horizontal braces 4a, 4b, 4c to form a lattice brace 3. The top parts 6a, 6b of the lattice brace 3 are fixed to one upper end bar 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dowel bar and a semi-precast concrete plate using the same.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing a building using a half precast concrete plate (hereinafter referred to as a half PCa plate), as shown in FIG. At the same time, the half PCa plate is conveyed to the site and the cast-in-place concrete 23 is cast on the thin half-PCa plate portion 21 at the site to form a concrete composite plate 24. There is a construction method of molding.

As the dowel 22 used in such a construction method, conventionally, as shown in FIGS.
In some cases, lattice streaks 27 and 28 are welded and fixed to both sides across the lower end streaks 25 and 25 and one upper streak 26 to form a three-dimensional truss streak having a substantially triangular cross section.

[0004]

By the way, in the above-mentioned half-PCa plate, considering the resistance mechanism, the half-PCa plate is used.
The force flows toward the concrete of the plate portion 21, and the lower end streaks 25,
Numeral 25 is only used for fixing to the semi-PCa plate portion 21. In addition, since the above-mentioned dovetail is expensive, there is a demand to reduce the amount of the material used as much as possible.

Therefore, the present invention provides a fixing portion for fixing the semi-PCa plate portion 21 to the lattice stitch itself to eliminate the conventional lower end streaks 25, 25, thereby saving material, facilitating manufacture, and reducing the cost of the product. It is an object of the present invention to provide a gibber streak to be formed and a semi-PCa plate using the same.

[0006]

In order to solve the above-mentioned problem, a first invention according to claim 1 is to form two oblique streaks descending in an octagonal shape with one upper streak portion as a top. A plurality of the stitches are arranged in the axial direction of the upper end streaks, and a pair of adjacent diagonal streaks are connected by a horizontal streak, and a lattice stitch is continuously formed with one wire, and each of the apexes of the streak is connected to the apex of the stitch.
This is a dowel muscle, which is fixed to an upper muscle of a book.

According to a second aspect of the present invention, in the first aspect of the invention, there is provided a dowel bar in which the horizontal streaks are arranged in a direction orthogonal to the axial direction of the upper end bar. According to a third aspect of the present invention, there is provided a semi-precast concrete plate using the dowel bar of the first aspect, wherein a pair of two oblique streaks descending in an octagonal shape with one upper streak portion as a top. A plurality of the stitches are arranged in the axial direction of the upper end streaks, and a pair of adjacent diagonal streaks are connected by a horizontal streak to form a lattice streak continuously with a single wire. A semi-precast concrete plate characterized by using a gibber stuck to an upper end bar, and burying a horizontal streak portion of the gibber in a thin plate-like semi-precast concrete portion.

According to a fourth aspect of the present invention, there is provided the semi-precast concrete plate according to the third aspect, wherein the horizontal streaks are arranged in a direction perpendicular to an axial direction of the upper end streaks.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in FIGS. 1 to 6 show a first embodiment.

FIGS. 1 to 3 show a dovetail muscle. The dovetail muscle 1 is composed of one upper muscle 2 and one lattice 3. The lattice muscle 3 is a diagonal muscle 5a on one side (for example, left side) inclined from one end of a horizontal muscle 4a arranged in a direction orthogonal to the axial direction of the upper muscle 2 to the upper muscle 2 and to the upper muscle 2 side. And the upper end of the one-sided diagonal streak 5a is bent at the upper surface of the upper end streak 2, and the other side (for example, right side) diagonal streak is inclined from the top 6a to the opposite side to the one-sided diagonal streak 5a. 7
a, a horizontal streak 4b parallel to the horizontal streak 4a is continuously formed at the lower end of the diagonal streak 7a on the other side. Top 6
b, the diagonal streak 7b on the other side and the horizontal streak 4c are repeatedly formed continuously. The diagonal streaks 5a and 7a, 5a and 7
“b” is a pair of diagonal stripes each having a U-shape.

The tops 6a, 6b of the lattice muscle 3
Are fixed to the upper end bar 2 by welding or the like. The upper end muscle 2
And the lattice 3 uses a steel bar, a stainless steel bar, a composite fiber rod, or the like.

With the above-described structure, the lattice wire 3 can be manufactured by continuously bending one wire rod by a molding machine, and the lattice wire 3 can be easily manufactured. Also,
Since the dowel bar 1 can be assembled and manufactured only by fixing one upper bar 2 to the lattice bar 3 by welding or the like, the two lower bars and one upper bar are used as in the conventional case. The material used for the dowel muscle may be reduced by about 1/4 to 1/3. Further, the number of welding points at the time of assembling is also reduced to 1/3, the number of steps is reduced, the assembling time of the dowel bar can be shortened, and the manufacture and the cost of the dowel bar can be facilitated.

Further, even in the case of a lattice stitch made of a single wire, the lattice streak 3 can be arranged on both sides (left and right) of the upper end streak 2 with good balance, and the horizontal streak 3a,
3b are arranged in parallel, so that the gibber 1 can be provisionally installed.

Further, the gibber 1 has a three-dimensional shape capable of coping with not only up and down but also front and rear and left and right forces. Further, as described above, since the horizontal streaks 4a, 4b,... Are arranged in parallel at right angles to the upper end streaks 2, a space is formed between these adjacent horizontal streaks. Therefore, facility piping and bar arrangement work can be easily performed through these spaces.

A desired number of the dowels 1 formed as described above are buried in concrete in parallel in a desired number. For example, as shown in FIGS.

FIGS. 4 and 5 show a half-PCa plate 8 using the above-mentioned dowel bar 1, and FIG. 6 shows a precast concrete composite plate using the half-PCa plate 8. In order to manufacture the semi-PCa plate, the desired number of the dowels 1 are erected in parallel on a bed of a factory and the lower part of the dovetails 1 is buried as shown in FIGS. 4 and 5. Concrete is cast to form a thin-walled semi-PCa plate portion 9, and a half-PCa plate 8 having a dovetail 1 formed on the surface is manufactured.

The dowel bar 1 of the semi-PCa plate 8 manufactured in this manner is connected to the PCa plate 9 by the horizontal bars 4a, 4b.
And the dowel 1 does not come off when the half-PCa plate 8 is transported from the factory.

Next, the half-PCa plate 8 is transported to the site, and the half-PCa plate 8 is transferred to the site, and
Is placed horizontally on the floor etc.
The concrete 10 is cast so that the dowel 1 is buried as shown in FIG. Thereby, the semi-PCa composite plate 11 in which the semi-PCa plate portion 9 and the cast-in-place concrete 10 are connected by the dowel 1 is formed. In this molding state, the horizontal bars 4a, 4b... Are firmly engaged with the semi-PCa plate 9 and the upper end bars 1 are firmly engaged with the cast-in-place concrete 10.
0 is firmly bound.

The semi-PCa plate 8 may be vertically arranged on site to be used as a concrete formwork. FIG. 7 shows a second embodiment of the dowel muscle of the present invention.

The gibber 1A of the present embodiment also has a single upper muscle 2
And one lattice lattice 3A. The lattice muscle 3A is a diagonal muscle 5a on one side (for example, right side) inclined from one end of the horizontal muscle 4a arranged in a direction orthogonal to the axial direction of the upper muscle 2 and in the axial direction of the upper muscle 2 and toward the upper muscle 2. Then, the upper end of the oblique streak 5a is bent at one side of the upper end streak 2 and the top 6
a, the oblique streaks 5a on the same side as the oblique streaks 5a on the one side.
Oblique streaks 7a are continuously formed by inclining in the direction opposite to the above, and horizontal streaks 4b parallel to the horizontal streaks 4a are provided at the lower ends of the oblique streaks 7a.
Are continuously formed, and the upper end muscle 2 is further connected from the other end of the horizontal streak 4b.
The oblique streaks 5b on the other side (for example, the left side) inclined in the axial direction and toward the upper end muscle 2 are raised, and the upper end of the oblique streaks 5b on the other side is bent at the other side of the upper end muscle 2 to form the top 6b. A diagonal streak 7b inclined in the opposite direction to the diagonal streak 5b is formed on the same side as the diagonal streak 5b on the other side, and a horizontal streak 4c parallel to the horizontal streak 4b is continuously formed at the lower end of the diagonal streak 7b. Further, from the other end of the horizontal streak 4c,
are repeatedly formed continuously. The diagonal stripes 5a and 7a, 5b and 7b form a pair of diagonal stripes in a C shape. Are fixed to the upper end line 2 by welding or the like.

The gibber muscle 1A of the second embodiment can exhibit the same function and effect as the gibber muscle 1 of the first embodiment. Further, the gibber 1A of the second embodiment is buried in the half PCa plate portion 9 as shown in FIGS. Half P as shown
By molding a Ca composite plate, the same action as described above,
It is effective.

FIG. 8 shows a third embodiment of the gibber muscle of the present invention. The dowel muscle 1B of the present embodiment also includes one upper muscle 2 and one lattice muscle 3B. Lattice streaks 3B extend from one end of horizontal streak 4a arranged in parallel with upper end streak 2 on one side (e.g.
The oblique streaks 5a which incline to the side are raised, and the oblique streaks 5
The upper end of a is bent at the upper surface of the upper end streak 2, and the other side (for example, left side) oblique streak 7a inclined from the top 6a to the side opposite to the one side of the oblique streak 5a side is continuously formed. Diagonal streak 7a
A horizontal streak 4b parallel to the upper streak 2 is continuously formed at the lower end of the lower streak, and a diagonal streak 5b inclined from the other end of the horizontal streak 4b toward the upper end streak 2 is raised. An oblique streak 7b that is bent at the upper surface of the upper end streak 2 and is inclined from the top 6b to the opposite side to the diagonal streak 5b is continuously formed on one side (for example, the right side). The horizontal stripes 4b are continuously formed in parallel to the above, and each stripe is repeatedly formed continuously from the other end of the horizontal stripes 4b in the same manner as described above. Are fixed to the upper end line 2 by welding or the like.

The gibber muscle 1B of the third embodiment can exhibit the same function and effect as the gibber muscle 1 of the first embodiment. Further, the gibber 1B of the third embodiment is buried in the half-PCa plate portion 9 as shown in FIGS. 4 and 5 similarly to the gibber 1 of the first embodiment. By forming a semi-PCa composite plate as shown in FIG.

FIG. 9 shows a fourth embodiment of the gibber muscle of the present invention. The dowel muscle 1C of the present embodiment also includes one upper muscle 2 and one lattice muscle 3C. Lattice streaks 3C are horizontal streaks 4a arranged in a direction inclined with respect to the axial direction of the upper end streaks 2.
From one end of the upper end muscle 2 in the direction orthogonal to the axial direction of the upper end muscle 2, the one side (for example, right side) of the oblique streak 5 a is inclined, and the upper end of the one oblique streak 5 a is placed on the upper surface of the upper end streak 2. To form a continuous diagonal streak 7a on the other side (for example, the left side) inclined from the top 6a to the opposite side to the diagonal streak 5a on one side, and the lower end of the diagonal streak 7a on the other side Horizontal streak 4b parallel to streak 4a (inclined with respect to axial direction of upper end streak 2)
Are formed continuously, and the oblique streaks 5b on one side, the top 6b, the oblique streaks 7b on the other side, and the horizontal streaks 4c are repeatedly formed continuously from the horizontal streaks 4b in the same manner as described above. The diagonal streaks 5a, 7a, 5b, and 7b form a pair of diagonal streaks, respectively.

The tops 6a, 6b of the lattice muscle 3
Are fixed to the upper end bar 2 by welding or the like. The dowel muscle 1C of the fourth embodiment can also exhibit the same function and effect as the dove 1 of the first embodiment.

Further, the dowel bar 1C of the fourth embodiment is buried in the semi-PCa plate portion 9 as shown in FIGS. 4 and 5, similarly to the dowel bar 1 of the first embodiment, and is further used. FIG.
By forming a semi-PCa composite plate as shown in FIG.

The dowels of the above embodiments can also be applied as a joining member between concrete other than the half-PCa plate.

[0028]

As described above, in the gibber stirrup according to the present invention, the lattice streak can be formed by a single wire into a three-dimensional shape so that it can cope with not only vertical and horizontal forces but also longitudinal and lateral forces. For this reason, the material used is reduced to about 1/4 to 1/3 and the number of welding points at the time of assembly is also reduced to about 1/3 as compared with the conventional one having two lower streaks.

Therefore, it is possible to reduce the material cost of the dowel, and to improve the work efficiency and the assembling time by reducing the number of assembling steps. Further, claim 2
In the gibber muscle described, since the horizontal muscle of the lattice muscle is arranged in a direction perpendicular to the upper muscle, there is no rebar such as the conventional lower muscle between the adjacent horizontal muscle, the conventional muscle The facility piping and the arrangement work are easier than those having the lower end parallel to the upper end as described above.

Further, in the semi-PCa plate using the dowel bar of the present invention, the dovetail bar of the present invention is firmly connected to the PCa plate portion by the horizontal bar, and the PCa plate having the effect of the dowel bar is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a dowel muscle of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a side sectional view of the PCa board in which the dovetail shown in FIGS.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a side sectional view of a concrete composite board molded using the PCa board shown in FIGS. 4 and 5.

FIG. 7 is a perspective view showing a second embodiment of the dowel muscle of the present invention.

FIG. 8 is a perspective view showing a third embodiment of the dowel muscle of the present invention.

FIG. 9 shows a fourth embodiment of the gibber muscle of the present invention,
(A) is a perspective view, (b) is a plan view.

FIG. 10 is a cross-sectional view of a PCa plate using a conventional dowel.

FIG. 11 is a perspective view of a dowel muscle in FIG. 10;

[Explanation of symbols]

1, 1A, 1B, 1C: Gibber muscle 2: Upper end muscle 3, 3A, 3B, 3C: Lattice muscle 4a, 4b, 4
c ... horizontal streaks 5a, 7a ... diagonal streaks 8 ... PCa board 9 ... PCa board part 10 ... cast-in-place concrete 11 ... PCa composite board

Continuing on the front page (72) Inventor Tomio Kano 65, Kamigashi-cho, Toyota, Aichi Prefecture Inside Toyota Soken Co., Ltd. Number: Within Toyota Soken Co., Ltd. (72) Inventor: Norikazu Asai 65, Kamikazu-cho, Toyota, Aichi Pref. 65 No.Ida Toyota Soken Co., Ltd.

Claims (4)

[Claims] 1. A pair of two oblique streaks descending in an eight-letter shape with one upper streak portion as a top portion, and a plurality of these oblique streaks are arranged in the axial direction of the upper streak, and a pair of adjacent oblique streaks is a horizontal streak. Lattice streaks connected in a continuous fashion with one wire rod,
The dovetail muscle, wherein each of the tops of the lattice muscle is fixed to the one upper muscle. 2. The dovetail muscle according to claim 1, wherein the horizontal muscle is arranged in a direction orthogonal to an axial direction of the upper muscle. 3. A pair of two diagonal streaks descending in an eight-letter shape with one upper streak portion as a top portion, and a plurality of these diagonal streaks are arranged in the axial direction of the upper streak, and a pair of adjacent diagonal streaks is a horizontal streak. Lattice streaks connected in a continuous fashion with one wire rod,
A semi-precast concrete plate using a gibber streak in which each of the apexes of the lattice stitch is fixed to the one upper end streak, and a horizontal streak portion of the gibber streak is embedded in a thin plate-like semi-precast concrete portion. 4. The half precast concrete plate according to claim 3, wherein said horizontal streaks are arranged in a direction orthogonal to an axial direction of said upper streaks.