JPS63125760A - Prefabricated reinforcement and semi-manufactured concrete panel using the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a semi-prefabricated formwork used as a permanent formwork for constructing walls, floor slabs, etc., for example, in buildings made of reinforced concrete or steel-framed reinforced concrete. This invention relates to concrete slabs and prefabricated reinforcing bars buried as reinforcing materials in the semi-prefabricated concrete slabs.

Further, in detail, an assembled reinforcing bar in which a top chord reinforcing bar and a bottom chord reinforcing bar, which are arranged facing each other in parallel with a predetermined interval, are connected and fixed at a plurality of positions in the longitudinal direction of both reinforcing bars by wrapping and clamping a band-shaped metal plate; The present invention also relates to a semi-prefabricated concrete plate in which a plurality of assembled reinforcing bars are arranged approximately parallel to each other at appropriate intervals, with the lower chord reinforcing bars of each assembled reinforcing bar being buried in concrete formed into a plate shape.

[Conventional technology]

For example, Omnia reinforcement and Kaiser truss reinforcement are well known as prefabricated reinforcing bars that are buried as reinforcing materials in semi-prefabricated concrete slabs. However, as has been said in the past, Omnia reinforcing bars and Kaiser truss bars have many connecting points between reinforcing bars, and it takes time and effort to manufacture them because they are all welded together. It has also been pointed out that there is a problem with cross-sectional defects in welded parts and that there are limitations on the diameter of reinforcing bars that can be used.

Therefore, as shown in FIG. 19(a), the applicant has previously installed the upper chord reinforcing bars (1a') and the lower chord reinforcing bars (1b'), respectively. proposed a method in which they were connected by a band-shaped metal plate (2゛) in an orientation substantially perpendicular to the (see Japanese Patent Application Laid-open No. 83756/1983).

Regarding the semi-prefabricated concrete slab, as shown in FIG.
) (see the above publication).

In the figure, (4'') and (5'') are connecting lines, and (C'') is a restraining line.

[Problem that the invention seeks to solve]

However, in the case of the conventional configuration described above, the assembled reinforcing bars have a ladder-like shape when viewed from the side, and cannot exhibit a very large resistance against external forces acting on the assembled reinforcing bars.

On the other hand, as mentioned above, the semi-prefabricated concrete slab that incorporates the prefabricated reinforcing bars does not have a very high bearing capacity, so the semi-prefabricated concrete slab can also be used as a formwork when constructing floor slabs and walls. When used as a component, in order to obtain the strength required for a floor slab or wall, a large amount of reinforcing material is required to be buried in the concrete that is cast on-site, in other words, a large amount of reinforcing steel that is constructed on-site. It was something like that. In addition, since the assembled reinforcing bars did not have a large yield strength, it was difficult to obtain semi-prefabricated concrete slabs with large spans.

In view of the above-mentioned circumstances, an object of the present invention is to make it possible to obtain prefabricated reinforcing bars with high yield strength, thereby increasing the span of semi-prefabricated concrete slabs incorporating prefabricated reinforcing bars, and to enable construction on-site. The purpose is to reduce the amount of reinforcing material.

[Means for solving problems]

The characteristic configuration of the assembled reinforcing bar according to the first invention is that the upper chord reinforcing bar and the lower chord reinforcing bar are arranged facing each other substantially in parallel with a predetermined interval,
The belt-shaped metal plates, which are connected and fixed by winding clamps at a plurality of positions in the longitudinal direction of both of the reinforcing bars, are arranged in a posture that is inclined in the longitudinal direction with respect to each of these reinforcing bars.

In addition, the characteristic configuration of the semi-prefabricated concrete slab according to the second invention is that the upper chord reinforcing bars and the lower chord reinforcing bars, which are arranged substantially parallel to each other at a predetermined interval, are connected by wrap-around clamps at multiple positions in the longitudinal direction of both reinforcing bars. The length direction of the belt-shaped metal plate to be fixed is
A plurality of assembled reinforcing bars arranged in a posture inclined in the longitudinal direction with respect to each of the two reinforcing bars are buried in concrete where a pair of bottom chord reinforcing bars of each assembled reinforcing bar is formed into a plate shape. The reason is that they are arranged almost parallel to each other with a distance between them.

[For production]

In other words, a band-shaped metal plate that is arranged in an inclined position to connect and fix both the upper chord reinforcing bars and the lower chord reinforcing bars,
Since a truss frame is formed together with both of these reinforcing bars, the yield strength of the assembled reinforcing bars can be made larger than before.

On the other hand, in a semi-prefabricated concrete slab incorporating assembled reinforcing bars, the strength is increased by the assembled reinforcing bars forming a truss frame, so it is possible to obtain a semi-fabricated concrete slab with a larger span than before. In order to obtain the strength required for floor slabs and walls, less reinforcing material is needed to be buried in the concrete poured on-site than before.

〔Effect of the invention〕

As a result, the yield strength of the assembled reinforcing bars can be increased, resulting in semi-prefabricated concrete products in which the lower chord reinforcing bars of the assembled reinforcing bars are buried in concrete, and beams obtained by embedding the entire assembled reinforcing bars in concrete cast on site. It has become possible to increase the strength of concrete structures such as floor slabs and floor slabs.

In addition, semi-prefabricated concrete slabs incorporating prefabricated reinforcing bars, which have a large bearing capacity by forming a truss frame, can have a larger span than conventional ones, so this semi-prefabricated concrete slab can be used as a member that also serves as the formwork for floor slabs. When used as a concrete floor, it is possible to further simplify the shoring of the floor immediately below the concrete pouring, and it is possible to start the next process early.
The amount of reinforcing material in concrete poured on site can be reduced,
Material costs can now be reduced.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

As shown in Figures 1 and 2, one top chord reinforcing bar (1a
) and a pair of lower chord reinforcing bars (1b) are arranged facing each other at a predetermined interval (Ll), and this upper chord reinforcing bar (1a) and a pair of lower chord reinforcing bars (
1b) are connected and fixed at a plurality of positions in the longitudinal direction by band-shaped metal plates (2) to form an assembled reinforcing bar (^).

Specifically, the band-shaped metal plate (2) is as shown in FIG.
It is a flat bar cut out in a Z shape.

Then, at both ends of each flat bar (2), top chord reinforcing bars (
1a) and one of the lower chord reinforcing bars (1b), and by crimping both ends thereof with a hydraulic tool for crimping sleeves in reinforcing bar joints, the upper chord reinforcing bars (1a) and one of the lower chord reinforcing bars (1b) are crimped. 1b) are connected and fixed.

As shown in FIG. 2, each flat bar (2) is arranged in an inclined position relative to the upper chord reinforcing bar (1a) and the lower chord reinforcing bar (1b), respectively. In addition, a flat bar (2) in which one of the lower chord reinforcing bars (1b) and the upper chord reinforcing bars (1a) are connected and fixed, and the other of the lower chord reinforcing bars (1b) and the upper chord reinforcing bars (
1b) are connected and fixed together, and are arranged alternately in the longitudinal direction of the reinforcing bars. Furthermore, adjacent flat bars (2) are arranged so as to be inclined in opposite directions.

In other words, each flat bar (2) forms a truss frame together with the upper chord reinforcing bars (1a) and the lower chord reinforcing bars (1b), thereby increasing the yield strength of the assembled reinforcing bars (8).

Note that each flat bar (2) may have a shape shown in FIG. 13 instead of having the shape shown in FIG. 3. In this case, since an overlap is required at the winding and clamping portion, the yield of material decreases, but the flat bar (2) can be cut out from the base material with less effort.

The specific configuration of the assembled reinforcing bars (A) can be changed as appropriate. Other embodiments are shown in FIGS. 14 to 18, respectively.

In the embodiment shown in FIGS. 14(a) and (El), each flat bar (2) is bent so that the longitudinal cross-sectional shape of each reinforcing bar (1a) and (1b) is approximately V-shaped. A pair of lower chord reinforcing bars (1b
) is wrapped around and held, and the top chord reinforcing bar (1a) is wrapped around and held at the bent part.

The embodiment shown in FIG. 15 is as shown in FIG. 14 (A) and (II).
This is a slight modification of the embodiment shown in Figure 1, in which the middle part of the flat bar (2) is wrapped once around the upper chord reinforcing bar (1a), thereby wrapping and holding the upper chord reinforcing bar (1a). The configuration of other parts is shown in Figure 14 (a) and (0).
It is the same as shown in .

In the embodiment shown in FIG. 16, a flat bar (2) is processed into a spiral shape, and the upper chord reinforcing bar (
The reinforcing bars (1a) and (1b) are wrapped around and held in the parts corresponding to the reinforcing bars (1a) and (1b).

The embodiment shown in Fig. 17 is the same as the embodiment shown in Figs. 1 and 2, but the method of connecting and fixing the upper chord reinforcing bars (1a) and the lower chord reinforcing bars (1b) using the flat bar (2) is the same. In this case, only one lower chord reinforcing bar (1b) is provided.

The embodiment shown in FIG. 18 is a modification of the structure shown in FIG. 17, in which the flat bar (2) is arranged in a shape similar to a platter lattice. As seen in this example, the flat bars (2) may not all be sloped. Incidentally, the connection and fixing structure by the flat bar (2) being rolled up and clamped is the same as in the previous embodiment.

Furthermore, in each of the embodiments described above, the flat bar (2
) may be carried out by crimping with a chisel-shaped tool or the like instead of crimping with a hydraulic tool. Furthermore, the upper and lower chord reinforcing bars (1a) and (1b) may be connected and fixed by using welding together with the winding clamp.

On the other hand, Fig. 4 shows a semi-prefabricated concrete slab (B), in which a plurality of the above-mentioned assembled reinforcing bars (^) are inserted among the reinforcing bars (1a) and (1b) constituting each assembled reinforcing bar (II). The lower chord reinforcing bars (1b) are buried in the concrete (3) and are arranged substantially parallel to each other at an appropriate interval (L2). In the figure, (4) and (5) are connecting lines.

Next, a procedure for constructing a floor slab (F) of a building using the above semi-prefabricated concrete slab (B) will be explained.

As shown in Figure 5 (a), a beam formwork (6) formed to a predetermined cross-sectional dimension is supported by a group of pipe supports (7), and the upper parts of the adjacent beam formworks (6) and (6) are z Semi-prefabricated concrete (B) is erected in the girder direction with the top chord reinforcing bar (1a) facing upward.

In the figure (8) is a pipe support for reinforcement.

Lay multiple semi-prefabricated concrete slabs (B) in the direction between the beams to form a floor form, arrange reinforcement to connect the top chord reinforcing bars (1a) of each slab (B), and install equipment piping embedded in the floor. After that, concrete is poured. As shown in FIG. 5(B), the semi-prefabricated concrete slab (B) serving as the floor formwork and the cast-in-place concrete (C) are integrated to form a floor slab (F).

The semi-prefabricated concrete slab (B) may also be used to construct a wall (-), and the procedure will be described next. When using the semi-prefabricated concrete slab (B) to construct a wall, the reinforcing bars (A) are in an upright position, but for convenience, they are buried in the concrete (3) of the semi-fabricated concrete slab (B). The reinforced reinforcing bars are called lower chord reinforcing bars (1b).

As shown in Figure 6 (A), after concrete pouring is completed, each assembled reinforcing bar (A) is placed on the building frame (S) with the top chord reinforcing bar (1a) facing inward and in an almost vertical position. In this state, a plurality of semi-prefabricated concrete plates (B) are erected one after another to form a formwork for the outside of the wall.

On the outer side of each semi-prefabricated concrete slab (B),
Finishing materials (9) such as tiles are attached in advance.

Next, as shown in Figure 6 (TI), horizontal reinforcement (1
0), wall inner formwork (11), beam formwork (12),
After erecting the floor formwork (13) and arranging the beam reinforcement (14) and slab reinforcement (15) on the upper floor, concrete is poured.

As shown in FIG. 6(C), the semi-prefabricated concrete slab (B) serving as the wall outer formwork and the cast-in-place concrete (C) are integrated to form the outer wall (-).

Next, a proof test conducted using this semi-prefabricated concrete slab (B) will be explained.

First, the configuration for the experiment will be explained.

As shown in Figure 7, a pair of support stands (
16A) and (16B), a semi-prepared concrete slab (B) whose longitudinal direction coincides with the support stand separation direction is erected. Between both support stands (16A), (16B) and the semi-prefabricated concrete slab (B), there is a reinforcing bar (17) placed in a direction substantially perpendicular to the longitudinal direction of the semi-fabricated concrete slab (B). It has been intervened.

Furthermore, the concrete of semi-prefabricated concrete version (B) (
3) On the top surface, there is a loading beam (
18) is placed via a reinforcing bar (19), and a hydraulic jack (21) is installed across the loading beam (18) and the reaction girder (20).

A load cell (22) for load measurement is interposed between the loading beam (18) and the hydraulic jack (21), and a dial for displacement measurement is installed on the lower surface of the longitudinal center of the semi-prefabricated concrete slab (B). A gauge (23) is attached.

Note that the dimensions of each part in the figure are as follows.

a=190 fl b=540 m Nine types of specimens were prepared. For each type, the conditions for concrete (3) are the same, the thickness is [60mm],
The planar dimensions are [500 tm x 2000 m]. And, the structure of the assembled reinforcing bars (A) is different. The conditions are listed in Table 1 below.

The drawing numbers shown in the second column of Table 1 correspond to the drawings showing the shape of the assembly reinforcing bars (A) used in each specimen. The specimen [IX] is Omnia version 17, which uses Omnia reinforcement as the assembly reinforcing steel (A).
-m-, and illustration of the assembled reinforcing bars (A) is omitted.

Further, the codes shown in the third and fourth columns of the table represent the diameters and quantities of the upper chord reinforcing bars (1a) and the lower chord reinforcing bars (1b) of the assembled reinforcing bars (A). For example, [2-D10] indicates that two deformed steel bars with a nominal diameter of [9.53 m] are used. Note that the diagonal lines in the Omnia version are [
D101.

Furthermore, the dimensions of each part in FIGS. 8(a) to 11(b) are as follows.

c=100 cranes d=300 cranes e=45 m f -30 m The results of experiments conducted using the above nine types of specimens are shown in the graph of FIG. 12 and the following Table 2.

In the graph of FIG. 12, the horizontal axis indicates displacement [δ],
The vertical axis indicates load [P]. The symbols [1] to [IX] attached to each line indicate the type of specimen, respectively. The numerical values in Table 2 below indicate the load and maximum load when initial cracking occurs.

From the experimental results in Table 2 and above, it is clear that the half-made concrete slab (B) (specimens [V] to [■]) according to the present invention has a strip metal plate (2
) arranged in a ladder shape (specimen [N~[
■]), the load at the time of initial cracking and
It can be seen that at both maximum loads, the values are much larger, and the values are almost the same as those of the Omnia version.

In carrying out the present invention, instead of a flat bar, an iron plate cut into appropriate dimensions may be used as the band-shaped metal plate (2). In addition, the shape, specific dimensions, etc. of the band-shaped metal plate (2a) can be changed as appropriate.

The upper chord reinforcing bars (1a) and lower chord reinforcing bars (1b) used for the assembly reinforcing bars (^) may be either round steel or deformed steel bars. Also, the diameters of those reinforcing bars (1a) and (1b), both reinforcing bars (
1a), the interval (L+) of (1b), the thickness of the half-made concrete plate (B), and the half-made concrete plate (B)
Each assembled reinforcing bar (A) inside, the interval between (A) (L
2) etc. can be changed as appropriate depending on the strength required for the half-sized concrete slab (B).

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

Figures 1 to 18 show examples of assembled reinforcing bars according to the present invention and hand-made concrete slabs using the assembled reinforcing bars, and Figure 1 is a perspective view of the assembled reinforcing bars, and Figure 2 is a side view of the assembled reinforcing bars. , Figure 3 is a side view of the band-shaped metal plate, Figure 4 is a cross-sectional view of the half-made concrete slab, and Figures 5 (a) and (b) show the procedure for constructing a floor slab using the half-made concrete slab. Cross-sectional views, Figures 6 (A), (I+), and (C) are cross-sectional views showing the procedure for constructing walls using half-cast concrete slabs, Figure 7.
The figure is a side view showing the experimental equipment for the load-bearing test conducted using a half-cast concrete slab, Figures 8 to 11 (a) are front views of the assembled reinforcing bars of the specimen used in the load-bearing test, and Figure 8 (U) in FIGS. 11 to 11 are side views of the assembled reinforcing bars of the specimen used in the proof stress test, FIG. 12 is a graph showing the experimental results of the proof test, and FIG. 13 shows another example of the band-shaped metal plate. A side view corresponding to FIG. 3, FIGS. 14(A) and (El) are perspective views and side views showing another embodiment of the assembled reinforcing bar, and FIGS. 15 and 16 are still another embodiment of the assembled reinforcing bar. A perspective view corresponding to FIG. 1 showing an example, and FIGS. 17 and 18 are side views corresponding to FIG. 2 showing still another embodiment of the assembled reinforcing bar. Figure 19 C) and (n) show conventional examples;
Figure (A) is a perspective view of assembled reinforcing bars, and Figure 1 (■) is a cross-sectional view of a half-finished concrete slab. (1a)...Top chord reinforcing bar, (1b)...
Lower chord reinforcing bar, (2)... Band-shaped metal plate, (3)...
...Concrete, (A) ...Assembled reinforcing bars.

Claims (1)

[Scope of Claims] 1. Upper chord reinforcing bars (1a) and lower chord reinforcing bars (1b), which are arranged facing each other in parallel with a predetermined interval, are connected to both reinforcing bars (1a).
), (1b) at multiple positions in the longitudinal direction, the band-shaped metal plate (2)
In the assembled reinforcing bars connected and fixed by the rolling clamps, the longitudinal direction of the band-shaped metal plate (2) is connected to both the reinforcing bars (1a),
(1b) The assembled reinforcing bars are arranged in an inclined position in the longitudinal direction of each of the steel bars. 2. The assembled reinforcing bar according to claim 1, wherein adjacent strip metal plates (2) are inclined in opposite directions. 3. The upper chord reinforcing bars (1a), the lower chord reinforcing bars (1b), and the band-shaped metal plate (2) are both reinforcing bars (1a), (1b).
) The assembled reinforcing bars according to claim 1 or 2, wherein the reinforcing bars are located on substantially the same plane along the longitudinal direction of the reinforcing bars. 4. The assembled reinforcing bar according to claim 3, wherein the upper chord reinforcing bar (1a) and the lower chord reinforcing bar (1b) are each constructed from a single reinforcing bar. 5. The lower chord reinforcing bar (1b) is the both reinforcing bars (1a), (
1b) The assembly reinforcing bars according to claim 1, which are provided at two locations spaced apart in a direction orthogonal to the longitudinal direction. 6. The assembled reinforcing bar according to claim 5, wherein the lower chord reinforcing bar (1b) is provided at the same position from the upper chord reinforcing bar (1a). 7. The assembly reinforcing bar according to claim 5 or 6, wherein the lower chord reinforcing bars (1b) are connected and fixed to each other. 8. One of the lower chord reinforcing bars (1b) and the upper chord reinforcing bars (1a)
), and the lower chord reinforcing bar (1).
The method according to claim 5 or 6, wherein the band-shaped metal plates (2) extending between the other one of the top chord reinforcing bars (1a) and the upper chord reinforcing bars (1a) are arranged alternately. Assembly reinforcing bars. 9. One of the lower chord reinforcing bars (1b) and the upper chord reinforcing bars (1a)
), and the lower chord reinforcing bar (1).
Claims 5 or 6, wherein the band-shaped metal plate (2) extending between the other one of the above chord reinforcement bars (1a) and the top chord reinforcing bar (1a) is formed by continuous bending of a single flat plate. Assembly reinforcing bars described in any one of the paragraphs. 10. The upper chord reinforcing bars (1a) and the lower chord reinforcing bars (1b) are arranged facing each other in parallel with a predetermined interval apart.
At multiple positions in the longitudinal direction of a) and (1b), the band-shaped metal plate (2
) are connected and fixed by the clamps of the lower string reinforcing bars (1b), and are buried in the concrete (3) formed into a plate shape, and are spaced approximately from each other at appropriate intervals. In the semi-prefabricated concrete slabs arranged in parallel, the length direction of the band-shaped metal plate (2) is connected to both the reinforcing bars (1
A semi-prefabricated concrete slab arranged in a posture inclined in the longitudinal direction with respect to each of a) and (1b).