JPS6294639A - Method for striking slab with reinforced concrete rib - 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 (Technical Field) The present invention relates to concrete frame structures, steel frame structures, or reinforced concrete ribbed slabs (ribs) stretched between spaces between architectural structures such as beams and columns. This relates to the concrete pouring method for concrete plates.

(Prior art) Such a ribbed slab is integrated with an upper reinforced concrete plate to form a flat plate with an array of reinforced concrete (
It is known to have the shape of a web.

In known ribbed slabs, the spaces between the ribs are filled with ready-made blocks, such as lightweight concrete blocks, lightweight cast blocks, blocks of foamed plastic material such as polystyrene. The advantage of such a structure is that it allows significant savings in materials, both concrete and reinforcing steel,
Furthermore, the ribbed slab thus formed is lighter than a slab made by pouring reinforced concrete entirely to the same thickness. In addition, such ribbed slabs are significantly lighter than fully filled slabs, thereby reducing the reinforcement requirements on the structure.

When driving such a slab with ribs, reinforcing rods and box hardware are required for the ribs, and reinforcing mesh is required for the plate-shaped portion (see 2).

Fillers, blocks as described above, are placed on the shutter between the rods and the box hardware, and if necessary these are removed after the concrete has hardened.

Problems with the Prior Art Such known ribbed slabs had several drawbacks. One of them is that they are not watertight, and water can leak through cracks in the top plate or cracks that spread between the ribs. Therefore, it was necessary to take special measures to make this type of slab watertight. Furthermore, the appearance of the lower side of the slab is not clean, and when a lower edge of a rib or a filler is provided, the lower surface of the filler appears on the outside. For this reason, it is necessary to finish the slab with mortar or install a suspended ceiling to improve the appearance.

From a structural point of view, the cross section of the concrete of the ribs and the flat plate of the slab is T-shaped, which is not optimal in terms of strength;
It is inferior to the cross section of the glyph.

Furthermore, from a functional point of view, ribbed slabs such as those described above have the disadvantage that they cannot be used to accommodate various functional elements, such as water supply and drainage pipes, electrical wiring, air conditioning ducts, etc., unless special considerations are taken. have.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide an improved method for driving ribbed slabs of this type.

SUMMARY OF THE INVENTION The present invention is based on the discovery that a number of advantages can be obtained by using a specially shaped steel plate as reinforcement for ribbed slabs of reinforced concrete.

The present invention obtained through the above discovery is characterized by comprising the following steps.

i) pouring a bottom concrete plate of continuous reinforcing concrete over the shutter, ii) before the bottom concrete plate has hardened, having an inverted U-shaped cross-section on said plate; Steel blocks, which serve as reinforcement bodies using pleated steel plates, are arranged in a pattern such that play spaces are formed between the side walls of adjacent steel blocks, or play spaces are formed between adjacent side walls of aligned steel blocks. 111) sealing all the open ends of the steel blocks or both open ends of the aligned series of steel blocks with cover plates; iv) pouring concrete on the aggregate formed as above, a pouring step in which the play space is filled to form concrete ribs, and all of the steel blocks are covered from above to form a top concrete plate on the upper side; ■> a step in which the concrete is hardened in this state; .

In the following description, the above-mentioned inverted U-shaped steel plate reinforcement body will be abbreviated as a steel block.

In the present invention, in the completed reinforced concrete ribbed slab, the steel block acts as a reinforcing element,
Ribs are formed between the sidewalls.

When a series of ribs is desired in the finished ribbed slab, the steel blocks are placed vertically in parallel on the bottom plate to form a continuous row of ducts; Each duct is formed by a group of steel blocks. Before pouring concrete, both ends of each steel block group are closed with cover plates, which will be explained later.

On the other hand, when the ribbed slab of the present invention is desired to have web-shaped ribs, a cover plate is individually provided at both ends of each steel block, and the steel block is placed above the shutter. The steel blocks are arranged in rows spaced apart so as not to form continuous ducts, and ribs are formed between each adjacent steel block.

(Effects of the Invention) The reinforced concrete ribbed slab according to the present invention has a top concrete plate and a bottom concrete plate, which is different from conventionally known ribbed slabs that only have a top concrete plate. .

Therefore, the entire assembly of the top concrete plate, ribs, and bottom concrete plate forms a 1-shaped cross section,
It is superior to the conventional ribbed slab top plate and T-shaped cross section of the slab.

Furthermore, since the ribbed slab according to the present invention is provided with a bottom concrete plate, the bottom surface of the slab is a neatly finished surface, and there is no need to add mortar finishing or other finishing processes to this surface. First, it is superior to conventional ribbed slabs with only an upper concrete plate.

Yet another advantage of the ribbed slab according to the invention is that the spans of the top concrete plate between the ribs are lined from below with horizontal sections of steel blocks, so that these span sections are watertight. That's true. Since the rib portions which are thick and have a large volume originally have a watertight structure, the slab according to the present invention has a watertight structure as a whole.
No special measures are required to provide watertightness.

Another particular advantage of the ribbed slab according to the invention is that the cavities formed by the steel blocks acting as reinforcing elements can be used for accommodating functional elements. In the ribbed slab according to the invention with only an array of ribs, the steel blocks form continuous long vertical ducts, which can be used to accommodate water supply and drainage pipes, electrical wiring, air conditioning piping, etc.

In the ribbed slab according to the invention in which the ribs are provided in a net-like manner, the steel block does not form a continuous duct.

However, this case also has the advantage that, by placing finished pipe elements between the aligned steel blocks before pouring the concrete, they can likewise be used to accommodate functional elements.

Note that this ribbed slab can be made to withstand any design load. This slab can be part of a building. In this case, vertical and horizontal loads on the columns and foundations of the building can be transferred.

The tunnel-shaped duct made of steel blocks can effectively transmit cold and warm air to the concrete, allowing the concrete to absorb heat and release it when necessary.

(Example) The present invention will be explained below with reference to the drawings.

First, a ribbed slab (flat plate with ribs) of a known structure is
This will be explained with reference to the drawings and FIG.

The known ribbed slab shown in FIG. 4 has ribs 1 and a reinforcing upper plate 2. The ribbed slab shown in FIG. The ribs 1 are reinforced by rods 3, and the stirrup-shaped part 4 and the upper plate part 2 are reinforced by wire fittings'/x having meridians 5 and latitudes 6. This slab furthermore has a filling block 7, for example of lightweight concrete. As shown in the figure, the cross section of this concrete ribbed slab assembly is T-shaped at the part marked with a circle A.

In the known ribbed slab shown in FIG. 5, the filling block provided to form the concrete pouring cavity is removed after pouring, so the filling block is not shown in the drawing. Similar to the example shown in FIG. 4, this example also has ribs 8 and an upper plate 9, and the cross section of the ribbed slab assembly in the area surrounded by circle B is also T-shaped.

Figure 1 shows a steel block 10 used for driving in the present invention.
This shows that. As shown, the block 10 made of pleated steel plate has an inverted U-shape.

Figure 2 shows the longitudinal open ends of the individual steel blocks being sealed;
Alternatively, a cover plate 11 is shown for closing both open ends when a plurality of these blocks are arranged in an array. As shown, the cover plate 11 has flaps 12 and 13,
These are engaged with the ends of the steel block 10.

The ribbed slab according to the invention shown in FIG. 3 has a bottom concrete plate 14 reinforced with a mesh of reinforcing rods having longitude lines 15 and latitude lines 16. The slab further has a top concrete plate 17 and ribs 18 arranged between the top concrete plate 17 and the bottom concrete plate 14. Furthermore, a plurality of reinforcing steel blocks 10 having a structure as shown in FIG. 1 are arranged on this slab, which is used for a ceiling, for example. The ribbed slab assembly in the area indicated by circle C in FIG. 3 has an I-shaped cross section.

The portion surrounded by the steel block 10 is left as a cavity as shown by 19, and is used for arranging water supply and drainage pipes, electrical wiring, air conditioning ducts, etc.

As can be easily seen in FIG. 3, the top concrete plate 17 extending between the two ribs 18 is lined on the underside with the horizontal portion of the steel block 10, so that the entire slab is watertight. By providing the bottom concrete plate 14,
The lower surface of the ribbed slab becomes a finished surface and does not require additional finishing steps such as mortaring.

Before pouring concrete, separate steel blocks 1
Cover plates 11 are attached to both ends of the steel blocks 10, or in some cases, to the two ends of a group of such steel blocks aligned, to prevent concrete from entering the inside of the steel blocks 10.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one example of a steel block used in the present invention, Fig. 2 is a perspective view of an end cover plate, Fig. 3 is a schematic cross-sectional view showing a part of the slab according to the present invention, Fig. 4 FIG. 5 is a schematic cross-sectional view of a known slab ceiling member. 10... Steel block 11... Cover plate 12, 13... Flap 14... Bottom concrete plate 15... Longitude line 16... Latitude line 17... Top concrete plate 18... Rib 1st Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. The method includes the following steps: i) pouring a bottom concrete plate of continuous reinforced concrete over the shutter; ii) before the bottom concrete plate hardens; On the plate, a steel block having an inverted U-shaped cross section and serving as a reinforcing body by a pleated steel plate is placed on the adjacent side walls of the steel block, with an idle space being formed between the side walls of the adjacent steel block or aligned with each other. iii) closing all open ends of said steel blocks or both open ends of a series of aligned steel blocks with cover plates; iv) above. Concrete is poured onto the aggregate formed as follows, so that all idle spaces are filled and concrete ribs are formed, and all the steel blocks are covered from above to form a top concrete plate on the upper side. A method for placing a reinforced concrete ribbed slab, comprising: a placing step; and v) a step of hardening the concrete in this state. 2. Arrange the steel blocks vertically aligned on the shutter to form a row of steel block groups, and close the two open ends of each steel block group with a cover plate before pouring concrete. A method according to claim 1. 3. The steel blocks are spaced apart and aligned on the shutter so as not to form a continuous duct, and both ends of each steel block are closed with cover plates before concrete pouring. Method. 4. The method according to claim 3, wherein a duct is formed between the reinforcing steel blocks arranged in alignment during concrete pouring.