JPH0642014Y2 - Heat resistant structure of synthetic slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to improvement of a heat-resistant structure in a synthetic slab in which concrete is poured and integrated on a deck plate.

<< Conventional Technology >> When constructing a concrete slab, for example, there is a method of using a corrugated deck plate as a formwork, arranging it at a predetermined position and placing concrete on the upper side of the formwork. . Then, after the casting, the deck plate used as the formwork is directly used as one of the main structural members,
A synthetic slab is used that exerts a synthetic effect by being structurally integrated by the synthetic mechanism of both.

However, in the above-mentioned synthetic slab, there is a risk of separation between the deck plate and the concrete due to a difference in thermal expansion coefficient between the deck plate and the like due to a temperature rise accompanying the fire. Then, the combined effect of the integration of the two is reduced or eliminated, and the structural performance is reduced.

Therefore, in order to solve such a problem, a heat resistant structure as shown in FIG. 3 has been conventionally taken. That is, concrete 1
When a fire occurs by spraying a fire-resistant coating material 5 composed mainly of asbestos on the bottom surface of the deck plate of the synthetic slab 3 including the deck plate 2 and the fire-resistant coating material 5 to completely cover the bottom surface of the deck plate 2. The temperature rise is suppressed as much as possible. In the figure, 6 is a spray nozzle.

<Problems to be solved by the invention> However, in the conventional heat-resistant structure described above, it is necessary to further spray the refractory covering material after the construction of the synthetic slab, and the skill required for the spraying work is required. Became long and very complicated. Further, dust is scattered from the fibers of asbestos, which is the main component of the fireproof coating material, during spraying work, and there is a problem in terms of work hygiene.

Further, in order to solve such a problem, it is possible to achieve automation by a spray robot, but it requires a robot main body and various control devices, and thus becomes large. As a result, a new problem arises that the work place is limited. In addition, the robot itself is very expensive, and there is a problem that the cost of the synthetic slab (with heat resistant structure) after construction becomes high.
Furthermore, although automation can shorten the construction period compared to manual work, it is still necessary to perform it separately from the construction of the synthetic slab, and it takes time for the spraying work and the drying process of the fireproof coating material 5 after spraying. However, it was impossible to eliminate the extension of the construction period due to the necessity of the construction.

The present invention has been made in view of the above-mentioned problems, and the purpose thereof is to eliminate the need for a fireproof coating material, to simplify the construction, to shorten the construction period, and to further reduce the cost. Providing heat resistant structure of synthetic slab.

<< Means for Solving the Problems >> In order to achieve the above-mentioned object, in the heat-resistant structure of the synthetic slab according to the present invention, in the synthetic slab in which concrete is cast and integrated on the deck plate, a plurality of the deck plates are provided. The plurality of deck plates were prepared and arranged in layers at predetermined intervals.

Further, it is preferable that a width adjusting member such as a sleeve is interposed between the deck plates and the deck plates are fixedly integrated by using fixing fittings such as bolts and nuts.

<< Operation >> Since the plurality of deck plates are arranged in layers at predetermined intervals, the space layer formed between the adjacent deck plates serves as a heat insulating material. As a result, a heat resistant structure can be provided, and peeling between the deck plate and concrete can be prevented even when a fire occurs.

Further, when the width adjusting member and the fixing metal fitting are arranged and integrated between the deck plates, the integration between the deck plates, and by extension, the deck plate and the concrete becomes stronger, and the heat resistance effect is also improved.

<< Embodiment >> A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a preferred embodiment of the present invention. As shown in the figure, basically, as in the conventional case, when the concrete is placed, the deck plate 10 is used as a formwork, the concrete 12 is placed on the upper side of the deck plate 10, and the two are integrated to form a composite. Build a slab.

In the present invention, as shown in an enlarged view in FIG. 2, the deck plate 10 is composed of two deck plates (first and second deck plates) 10a, 10 vertically arranged at a predetermined interval.
It has a two-layer structure having b. Specifically, first,
A sleeve 14 having the same length is arranged between the second deck plates 10a and 10b, and fixedly integrated with a bolt 16 and a nut 18 penetrating between the deck plates 10a and 10b and the sleeve 14.

In this way, since the space layer 20 is formed between the first and second deck plates 10a and 10b at a predetermined interval, the space layer 20 serves as a heat insulating material. If the side ends of the deck plate 10 are opened, the heated air in the air layer 20 can be discharged to the outside when a fire occurs, and a more effective heat insulating effect can be achieved. In addition, when both side ends of the deck plate 10 are closed, heat insulation is achieved by, for example, filling the first and second deck plates 10a and 10b with a substance having low thermal conductivity (regardless of the state). The effect can also be improved.

Further, in this embodiment, the nut 18 is located on the side of the first deck plate 10a located on the upper side, which contacts the concrete 12. With such a structure, the nut 18 and the threaded portion 16a of the bolt 16 in a meshed state are embedded in the concrete 12, and it is possible to prevent loosening therebetween during use.

Next, an example of the construction of this embodiment will be described. First, the deck plate 10 having the two-layer structure as described above is formed in advance in a factory or the like. Then, the thus integrated deck plate 10 is carried to the construction site and constructed in the same construction order as the conventional synthetic slab.

As another method, first, the first deck plate 10a and the concrete 12 are integrated as in the conventional case. After that, the first deck plate 10a and the deck plate 10b may be integrated to form the heat resistant structure of the present invention. However, in this case, before placing the concrete 12 on the first deck plate 10a, the bolt 16 is attached to the first deck plate 10a in advance, and the screw portion 16a of the bolt 16 is attached to the first deck plate 10a. It is necessary to project it from below the deck plate 10a.

Although the deck plate 10 has a two-layer structure in the above-described embodiment, the present invention is not limited to this and may have a multi-layer structure of three or more layers.

<Effects of the Invention> As described above, according to the heat-resistant structure of the synthetic slab according to the present invention, a plurality of deck plates are prepared, and the plurality of deck plates are arranged in layers at predetermined intervals. , The space formed between each deck plate acts as a heat insulating layer, and when a fire occurs, heat does not directly come into contact with the concrete and is integrated with the deck plate, so the heat insulating effect can be exerted. .

Further, according to the present invention, since it is not necessary to spray the fireproof coating material unlike the conventional heat insulating means, not only the work period is shortened, but also the work hygiene problem due to the dust generated during the spraying work has been a problem in the past. Can also be solved.

Further, since the construction method is almost the same as the construction method of the conventional synthetic slab, no skilled technique is required.

As a result, the cost can be reduced.

Also, if each deck plate is connected using fixing fittings such as bolts and nuts and a width adjusting member such as a sleeve is interposed between each deck plate, the intervals between the deck plates can be easily set to the same length. In addition to being able to achieve stable heat insulation without variation, it is possible to improve the integrity between deck plates, and thus between deck plates and concrete, and to further eliminate heat resistance (heat insulation effect). The structure can be planned.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of a heat-resistant structure of a synthetic slab according to the present invention, FIG. 2 is an enlarged sectional view of a main part thereof, and FIG. 3 is a sectional view showing a conventional example. 10 …… Deck plate 10a …… First deck plate 10b …… Second deck plate 12 …… Concrete, 14 …… Sleeve 16 …… Bolt, 18 …… Nut

Claims (2)

[Scope of utility model registration request] 1. A synthetic slab in which concrete is poured and integrated on a deck plate, a plurality of the deck plates are prepared, and the plurality of deck plates are arranged in layers at predetermined intervals. Heat-resistant structure of synthetic slab characterized by. 2. A width adjusting member such as a sleeve is interposed between the deck plates, and the deck plates are solidly integrated with each other by using fixing fittings such as bolts and nuts. Item 1. A heat-resistant structure for a synthetic slab according to item 1.