JPS606085Y2 - Reinforcement fittings for reinforced concrete perforated beams - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to reinforcing metal fittings for reinforced concrete perforated beams.

When opening a hole in a reinforced concrete block, the cross-sectional area of the concrete at the opening decreases, resulting in a decrease in bearing strength.

Therefore, in order to reinforce this decrease in yield strength, in the past, the transverse reinforcement type shown in Figure 1a, the stirrup type shown in Figure 1, the diagonal reinforcement type shown in Figure 1C, and the combination of transverse reinforcement and sub-tire reinforcement shown in Figure 1d are used. Formula, Figure 1 e
There are various construction methods, such as the wire mesh method shown in Figure 1, and the plate method shown in Fig. 1, or a combination of these methods, but all of these methods have difficulty in construction, resulting in long construction periods and long construction times. There are many drawbacks, such as variations in strength and the inability to obtain uniform yield strength, which makes quality control difficult, and in some cases, the reinforcing metal fittings themselves are expensive and inconvenient to transport.These drawbacks have been resolved. The appearance of reinforcing metal fittings has been highly desired in the construction industry.

The purpose of the present invention is to fully meet these demands and provide a reinforcing metal fitting that is extremely convenient for quality control by simplifying construction, improving and equalizing reinforcement strength, and simplifying design. The reinforcing metal fitting is comprised of a bifurcated longitudinal member whose tip extends in one direction and a linear longitudinal member which is tied to the bifurcated root of the member and extends in the other direction.

Next, an embodiment of the present invention will be described with reference to FIGS. 2a and 2. Reference numeral 1 indicates a bifurcated longitudinal member, and the member 4
It consists of two bolts 1a and 1b bent in a dogleg shape, and a three-pronged fastener IC having a threaded hole at each end, and the bolt 1aib is inserted into two places from the threaded holes at the end. Formed by screwing.

Reference numeral 2 designates a linear longitudinal member, and the member 2 consists of a longitudinal bolt, which is screwed into the remaining one of the screw holes to obtain a reinforcing metal fitting 3 as already shown in FIG.

According to another embodiment shown in FIGS. 3A and 3S, the bifurcated elongated member 1 is bent into a metal rod 1d, a substantially triangular plate portion on one side, and a screw hole on the other side. A binding tool 1e having
It is formed by caulking the plate-shaped portion of the fastener 1e to the root of the metal rod 1d.

Then, screw the bolt 2 into the screw hole of the fastener 1e, and
A reinforcing metal fitting 3 is obtained as shown in the figure.

Furthermore, FIG. 4 shows another embodiment, in which a bifurcated longitudinal member 1 is formed in a U-shape, and a bolt-like linear member is connected to the root of the bifurcated member 1 through a fastener 1f. Longitudinal member 2 of
concluded.

In the above embodiment, the bifurcated longitudinal member 1 is connected to the linear longitudinal member 2 by screwing or caulking using a binding tool, but the invention is not limited to this, and any method such as welding may be used. The binding means may also be used.

Next, in the construction using the reinforcing metal fittings 3 of the first embodiment, two of the reinforcing metal fittings 3 are made into a set, and these metal fittings 3, 3 are inserted from both sides of the hole, that is, the through sleeve 4, as shown in FIG. The metal fittings 3 are arranged so as to surround the beam, and each metal fitting 3 is connected to the reinforcing bars 5, 5 forming the frame of the beam at the tip of the bifurcated portion with wire or the like.

Here, it is preferable that both metal fittings 3, 3 are brought into contact with each other at an intermediate position of the bifurcated portion.

Next, concrete may be poured into the formwork 6 in the same manner as in the construction process.

Incidentally, the metal fittings of other examples are also constructed in the same manner.

Next, the inventor has a height of 50077E171. A reinforced concrete casing with a width of 30 mm and a length of 500 mm with the reinforcing fittings of the first embodiment embedded therein was prepared, and loads were applied from above and below as shown in Figure 6 to apply shear force to the reinforced concrete casing. I let it happen.

At that time, as shown in Figure 7, the force acting on each part of the reinforcing metal fittings was measured using strain gauges attached to each part.

The results were as follows. Values in the above table with a negative sign indicate that compressive force is acting.

Here, in view of the measurement results in the table above, a shown in Figure 7
At points d and d, a tensile force in the direction of the arrow acts regardless of whether the load P is positive or negative, and it can be estimated that a tensile force in the direction of the arrow also acts at points d and c.

Here, since the metal parts related to points a and b and the metal parts related to points C and d are tied together by the fasteners 1c, they tend to expand around the hole as the liquid progresses. The action is restricted and the yield strength increases.

That is, from these facts, it is thought that the reinforcing metal fitting 3 exhibits a behavior similar to that of a hoop action, and the reinforcing effect becomes high.

Furthermore, the tensile force of the metal fittings at points a, b, c, and d is dispersed and supported by the metal fittings at points e, f, and g, and the reinforcing effect is further enhanced.

Note that the above also applies to other embodiments.

As described above, according to the present invention, the bifurcated longitudinal portion 1 of the reinforcing metal fitting 3 surrounds the periphery of the hole from the left and right, so that the hoop action-like force acting on the periphery of the hole is prevented by the bifurcated longitudinal portion 1. In addition, the reinforcing metal fittings 3, 3 can be arranged in a facing relationship so as to surround the periphery of the hole, so the construction can be simplified and the construction period can be shortened. Further, since the structure is simple, it can be obtained at a low price, and it is easy to standardize, which is extremely convenient in terms of quality control, and it has effects such as being easy to pack and transport.

[Brief explanation of drawings]

Figures 1a to 1f are longitudinal sectional views showing various reinforcement states of reinforced concrete perforated beams by conventional construction; Figure 2a is a front view showing an exploded state of an example of the reinforcement fitting of the present invention; Figure 3a is a front view showing the disassembled state of another example, Figure 3 is a front view showing the completed state, and Figure 4 is a front view of another example. A front view showing the completed state, FIG. 5 is a vertical cross-sectional view showing the construction state using the reinforcing metal fittings shown in the example shown in FIG. 6, and FIG. 6 is an explanatory diagram showing the load test method.
FIG. 7 is an explanatory diagram showing measurement points when carrying out a load test. 1... Bifurcated longitudinal member, 2... Linear longitudinal member, 3... Reinforcement fitting.

Claims (1)

[Scope of utility model registration request] This reinforcing metal fitting for a reinforced concrete perforated beam consists of a bifurcated longitudinal member 1 whose tip extends in one direction and a linear longitudinal member 2 which is connected to the bifurcated root of the member 1 and extends in the other direction.