JP2792837B2 - Multi-column structure in reinforced concrete building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete structure having excellent seismic resistance, design, and comfort by combining a slab having a multi-grating beam with a column element on a wall. .

[0002]

2. Description of the Related Art A column / beam structure in a conventional reinforced concrete building, for example, a column / beam used in an apartment house or the like.
In a beam-framed structure, the long-term load received by the slab shall be transmitted from the small beam to the large beam and from the large beam to the column. No load is allowed to flow, and in the calculation of the frame strength, the strength is calculated only for beams and columns excluding walls. Of course, a wall with a small opening in a ramen structure is used for calculation, but only short-term loads (earthquake and wind) are processed, and the wall is subjected to a long-term load except for the case of calculation of a wall-type structure. There was nothing. The wall is composed of single or double rebars in a grid pattern vertically and horizontally, and is arranged in a plane as a boundary wall between the outside and the dwelling unit, and is formed by casting concrete. The pillars are formed by surrounding the stirrups with a small pitch around a thick vertical streak (main streak) at a small pitch to support the own weight of the upper part and the loading load (referred to as long-term load). Are located in

[0003] In addition, a conventional wall-mounted column, for example, in a boundary wall of a dwelling unit formed by arranging a column with a wall, is configured such that a large long-term load or a short-term load due to a structure above itself is arranged at each point of the frame. Since the reinforced concrete wall is formed to have a thickness several times larger than the thickness of the reinforced concrete wall so as to be shared with and supported by the pillars, the reinforced concrete wall travels. And it is located at every important point other than the four corners of the house. By the way, Japan, a volcanic country, is frequently hit by earthquakes and causes great damage, but the Building Standards Act has gradually improved its seismic resistance based on research on past earthquakes. But,
Its seismic resistance was based on the Great Kanto Earthquake with a seismic intensity of 6, and did not target the seismic intensity 7.2 of this Great Kansai Earthquake. If this corresponds to a seismic intensity of 7.2, the beams and columns will be huge.

[0004]

As described above, the method of supporting a long-term load or a short-term load due to a structure above itself with columns and columns arranged at key points of the frame has the following problems. there were. 1. In the conventional calculation of short-term load, the seismic load is not assumed to be a direct type, so if a direct type earthquake is encountered, a huge short-term load is added in addition to the long-term load, so columns, especially the first floor are used as parking lots and walls and A single pillar that is not connected is often damaged. 2. Since the wall thickness and the column width are different, extra labor and cost are required for assembling the formwork, and the design is limited to some extent. 3. A large beam is needed to connect the pillars, and under the pillars together with the projections of the pillars, the lower part of the beam comes into the room, visually obstructing and reducing the living space. 4. The wall thickness cannot be reduced below a predetermined thickness just because the long-term load is supported only by the columns. Rather, concrete, which had exhibited alkalinity in the initial stage, became neutralized and acidified with the passage of time. However, the penetration of the water from the cracks and the peeling of the concrete cause corrosion of the reinforcing steel, so that the aging of the frame is accelerated. 5. Pillars are arranged at key points, but as the number of floors increases, the area occupied by the pillars increases, and the usable indoor space decreases.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to incorporate a column element supporting a long-term load into a wall so that a long-term load, Reinforced concrete structures that reduce the number of pillars that travel from the wall by reducing the number of pillars that travel on business trips and reduce the size of the girder connecting the pillars, by distributing short-term loads in a uniform distribution. Is to provide.

Further, the present invention has such a reinforced concrete wall, reduces the protrusion into the room, makes the living space clear and wide, and has a high utility value for a long time.
It is an object of the present invention to provide a reinforced concrete building that can withstand long-term use such as 60, 100 or 300 years.

[0007]

According to a first aspect of the present invention, there is provided a multi-column structure for a reinforced concrete building according to the present invention, wherein each of the multi-lattice slabs has at least one unidirectional multi-lattice beam. A configuration was adopted in which a wall including a multi-column portion was formed by winding a band bar around a vertical bar of a wall to be in contact with the end portion, and used as a bar forming bar.

[0008] In the multi-column structure of the reinforced concrete building according to the second aspect, in the reinforced concrete building according to the first aspect, another wall forming arrangement that is continuous with the column-arranged reinforcing arrangement around which the strip is wound. The construction was such that the concrete thickness of the streaks was the same.

In the multi-column structure of a reinforced concrete building according to claim 3, the slab beam is a continuous body of ribs forming a waffle slab. There was a certain configuration.

In the multi-column structure of the reinforced concrete building according to the fourth aspect, the cover thickness of the concrete on the wall is 3 to 7 cm.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing an arrangement between reinforcing bars of a reinforced concrete wall according to an embodiment and a slab side beam, FIG.
Is an explanatory view showing a state of a beam of the slab, and FIG. 3 is an explanatory view showing a reinforcing arrangement for a concrete wall.

In FIG. 1, reference numeral 1 denotes a reinforced concrete wall, and 2 denotes a wall forming reinforcement arranged therein. The wall forming reinforcement 2 is composed of a vertical reinforcing bar 2a and a horizontal reinforcing bar 2b. Reinforcement is arranged in two parallel planes (double arrangement).

Reference numeral 3 denotes a waffle slab, and a vertical rib 4
a, and a large beam 5 that is regarded as a continuous rib 5a.

Numeral 6 denotes a column-arranged reinforcing bar provided on the wall-arranging reinforcing bar 2 at a position corresponding to the end of the girder 5, and a vertical reinforcing bar of the wall-arranging bar 2 is provided. A large number of band reinforcing bars 6a are arranged in a vertical direction (that is, at a floor height) with a plurality of the reinforcing bars 2a inserted. The width of the band reinforcing bar 6a in the thickness direction of the wall is formed so as to be substantially the same as the interval between the horizontal reinforcing bars 2b arranged in two rows in the horizontal direction of the wall forming reinforcing bar 2. I have.

Numeral 7 denotes a concrete part which is provided with a formwork on the wall forming reinforcement 2 and which is cast on both sides in this case.
A wall surface having no steps is formed on the entire surface including the column-arranged reinforcing bars 6 with a cover thickness of 0 mm each. Here, the age of the concrete is t = 300 years, and the water cement ratio W ₀
= 60%, the neutralization depth X of the concrete is given by the following equation: t = ((0.3 × (1.15 + 3W ₀ )) / (W ₀ −
0.25) 6.44 cm by ² ) × X ² , X = 3.72 c at t = 100 years
Since m is obtained, it is sufficient to build a cover thickness of 7 cm for 300 years and a cover thickness of 4 cm for 100 years. When the cover thickness is 3 cm, t = 60 years. FIG. 1 shows a part of the frame, but the lower part schematically shows that the column elements 1a are formed at a predetermined pitch in the wall.

The slab in this embodiment is a waffle slab 3, and this waffle slab 3 is formed using a waffle mold 8 made of plastic. FIG. 3 shows a manufacturing procedure in the case where the reinforced concrete wall 1 and the waffle slab 3 of the present invention are combined. This will be briefly described.
a is formed by laminating a gypsum board 10 as an inner wall base material on a form panel 9 formed by laminating four pieces of a on a frame 9b, and a tile panel is laminated on the form panel 9 as an outer wall finishing material. The outer wall formwork 11 is provided by arranging them on the outer surface side. At this time, a light gauge-shaped guide rail 12 is sandwiched between the form panels, and the vertical members on both sides of a separator 13 formed in a wrapped shape are inserted between the guide rails 12. Let the interval be maintained.

After forming the mold, the separator 13
And the vertical reinforcing bar 2a and the horizontal reinforcing bar 2b are arranged and assembled via the separator 13, and a column forming reinforcing portion 6 by the band reinforcing bar 6a is provided at each girder position to be described later. After completing the wall-forming reinforcement 2 in this way, it is inserted into the formwork.

On the slab side, a waffle formwork 8 formed by assembling four waffle formwork parts 8a that are inclined in such a manner that the lower part expands is arranged. In this case, since a groove-like concave portion is formed between the waffle mold frame parts 8a, the groove-like concave portion is formed into a lattice shape continuously in the vertical and horizontal directions. After the slab-side formwork 14 is formed in this manner, the beam assembling bars 15 formed by fixing the continuous mountain-shaped reinforcing bars to one reinforcing bar are inserted into the lattice-shaped grooves as two sets of one set each. Reinforcement for slab. Accordingly, the column-arranged reinforcing bar 6 is arranged in a linked state with one side (this is referred to as a girder side) of the slab reinforcing bar. The other side of the slab arrangement is directed toward the opening side of the skeleton, which is referred to as a small beam side.

After the reinforcing work has been completed as described above, the concrete is cast, whereby the waffle slab 3 and the reinforced concrete wall 1 are integrally formed. Will be supported. Then, after the mold is removed, the wall surface is tiled, and the inner surface side is affixed with a wall base material, so that the work related to the outer wall formation can be extremely reduced. 4 is a small beam in the figure. In addition, this small beam 4
As shown in FIG. 2, is connected to a square-shaped frame member 16 provided on the opening side and corresponding to the roll. In this case, the multi-columns and the four corner columns maintain the strength for the vertical seismic force with high speed, and the square-shaped ramen preserves the strength for the horizontal seismic force.

The operation of the square-shaped ramen 16 will now be described. In FIG. 2, the direction A is the column elements 1a, 1
a, 1a, that is, the long-term load is processed by multiple columns, and the strength of the horizontal load is maintained by the action of the wall. Further, in the direction B, a wall cannot be provided because lighting and ventilation are necessary as a house. However, since the long-term load has already been received by the column elements 1a, 1a, 1a,... In the A direction, it hardly acts on the column 16a in the B direction, so the weight of the beam (shown as a reverse beam) 16b is reduced. It can be considered that there is almost no burden except for this. As a result, as shown in FIG. 6, it is assumed that only the horizontal force is applied in the direction B, and the thickness of the column 16a is set to 1/2 to 1 compared to the conventional one.
/ 3 or so. In the figure, Y is the conventional dimension, X
Is the current dimension for that.

As described above, the reinforced concrete wall 1 according to the present embodiment has a band reinforcing bar 6a inside.
, And the column elements 1a are arranged in parallel with the wall thereof. The column elements 1a are in a state of supporting the large beams 5 formed on the waffle slab, respectively, to form a strong skeleton. Further, since the applied load is shared and supported by many column elements 1a, sufficient strength can be obtained even if the wall thickness is smaller than that of the conventional column. FIG. 4 and FIG. 5 show a structure in which the above-mentioned structure is adopted in a three-door and one-type apartment house.
Is extremely low. In addition, by setting the cover thickness of the concrete to 70 mm, the protection period of the reinforcing bar is reduced to 30 mm.
It can be secured for as long as 0 years, and since there is no protrusion of the pillars into the dwelling unit and it is easy to use, there is an advantage that it can be used for as long as 300 years.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the invention. This is also included in the present invention.

For example, the shape, the assembling sequence, and the like of the wall-arranged reinforcing bar 2 and the pillar-arranging bar 6 can be arbitrarily set.

Although the multi-lattice beams and the multi-column structure of the slab have been described in the case of an apartment house, in addition to this apartment house, hotels, stores, offices, etc., which require a certain number of walls and the like for use. It is a suitable combination.

[0025]

As described above, in the multi-column structure of the reinforced concrete building according to the first aspect of the present invention, since the above-mentioned structure is employed, the structure effectively acts on seismic force. The frame can be preserved by receiving the high-speed pitching seismic force directly from a number of beams supporting the slab to a plurality of columns in a state where the load is dispersed and efficiently transmitting the same. The pillars required for the corners and openings can be reduced in thickness, so that the wall is economical, and the strength of the wall itself is improved and its durability is increased, so that effects such as improved safety are obtained.

In the multi-column structure of the reinforced concrete building according to the second aspect of the present invention, since the above-mentioned structure is adopted, the columns arranged in the middle of the wall do not protrude from this wall. There is no protrusion to the room etc.
The effect of being able to effectively use everything including the wall is obtained.

In the multi-column structure of the reinforced concrete building according to the third aspect of the present invention, since the above structure is adopted, a large beam or column is not required in the middle of the ceiling, and the room can be effectively used widely. Therefore, effects such as improvement in the freedom of the indoor layout can be obtained.

In the multi-column structure of the reinforced concrete building according to the fourth aspect of the present invention, since the above-mentioned structure is adopted, it is possible to effectively use the room spaciously without producing a blind spot which is difficult to use. The dwelling unit can be used for 60 to 300 years by improving the freedom of building and preventing it from becoming obsolete for a long period of time, and by increasing the thickness of the concrete covering on the reinforcing bar and extending its service life. And other effects can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a state in which reinforcing bars of a reinforced concrete wall according to an embodiment of the present invention are joined to beams on a slab side.

FIG. 2 is an explanatory diagram showing a state of a beam in the slab according to the embodiment.

FIG. 3 is an explanatory view showing a gist of a reinforcement for a concrete wall according to the embodiment.

FIG. 4 is a plan view showing a three-door and one-type apartment house employing the structure of the present invention according to the embodiment;

FIG. 5 is a plan view showing a linked state between a slab beam and a column element according to the embodiment.

FIG. 6 is an explanatory diagram comparing the thickness of an opening side column with a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforced concrete wall 1a Column element 2 Wall formation reinforcement 2a Vertical reinforcement of wall formation reinforcement 2b Horizontal reinforcement of wall formation reinforcement 3 Waffle slab 4 Beam 4a Length of waffle slab Directional ribs 5 Large beams 5a Lateral ribs of waffle slabs 6 Reinforcing bars for column formation 6a Reinforcing bars for rebars for column formation 7 Concrete portion of wall 8 Waffle form 15 Assembling bars for beams

Claims (4)

(57) [Claims] In a multi-grating beam slab, at least a one-way multi-grating beam includes a multi-column wall portion including a multi-column portion which is wound around a longitudinal bar of a wall in contact with each end portion of the multi-grating beam and serves as a column forming bar. A multi-column structure in a reinforced concrete building characterized by having. 2. The reinforced concrete building according to claim 1, wherein a concrete thickness of a continuous reinforcing member for forming a wall and a continuous reinforcing member for forming a wall is the same. Multi-column structure in a reinforced concrete building. 3. The multi-column structure of a reinforced concrete building according to claim 1, wherein the slab beam is a continuous body of ribs forming a waffle slab. 4. The multi-column structure in a reinforced concrete building according to claim 1, wherein the cover thickness of the concrete on the wall is 3 to 7 cm.