JPH06280338A - How to build a slab - Google Patents

Abstract

(57) [Summary] [Purpose] When a precast concrete slab is used, the vertical load and horizontal load are distributed and transmitted to the large beams in two directions. [Structure] Pre-cast concrete small beams 2 and 2 are installed in two directions between two-direction large beams 1 and 1, and the plane surrounded by the large beams 1 and 1 is equally divided into a plurality of planes. After laying the precast concrete floor slab 3 on the plane of each minimum unit, the adjacent floor slabs 3 on the beam 2 are
This is a method of constructing a slab 6 by filling concrete 4 between 3 and integrating floor slabs 3 and 3. By connecting the perimeter of floor slab 3 to girders 1 and girders 2, each slab 3 has four sides. The vertical load and the horizontal load are evenly distributed and transmitted to the girders 1, 1 in two directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab construction method using a precast concrete floor slab.

[0002]

2. Description of the Related Art A slab using a slab made of precast concrete is conventionally constructed by installing a slab having a beam in one direction between opposing beams. Vertical load flows in the direction of the beam,
Since it is transmitted to the girders on both ends of the floor slab, it is not evenly distributed in the girders in two orthogonal directions, and stress tends to be concentrated in the girders in one direction.

Further, since the floor slab has poor in-plane rigidity in the direction orthogonal to the beam direction, it is easy to concentrate the horizontal load on a part of the beam in that direction, and it is difficult to transfer the horizontal load to the beam independently. Therefore, in order to disperse and transmit the horizontal load to the girder, it is usually indispensable to place concrete on the floor slab and integrate them to secure the in-plane rigidity in that direction.

This invention was made by focusing on the above problems of a slab using a precast concrete floor slab,
We are going to propose the construction method of the slab that disperses the vertical load and the horizontal load to the large beam and transmits them.

[0005]

According to the present invention, precast concrete beamlets are installed in two directions between two-direction beam beams to form a lattice beam, and the plane surrounded by the beam beams is equally divided. By laying a precast concrete floor slab on the plane of the divided minimum unit and connecting the perimeter of the floor slab to a large beam and a small beam, vertical load and horizontal load can be achieved without placing concrete on the floor slab. The load is distributed to the girder and transmitted.

Concrete is filled between adjacent floor slabs on the beam, and the floor slabs are supported by the beam and the girder while being integrated with each other.

A plane surrounded by large beams in two directions is evenly divided by small beams, and each floor slab is supported by four sides by laying the floor slab on the unit plane, and the vertical load is directly
Alternatively, the signals are evenly distributed and transmitted to the girders in two directions through the girders.

Beams and girders are connected around each floor slab by the concrete filled between adjacent floor slabs, and the floor slab is integrated with the girders and girders to increase the in-plane rigidity of the floor slab, The horizontal load is also distributed and transmitted to the large beams in two directions via the small beams.

At the same time that the floor slab is supported by the beam and girder,
By integrating the concrete filled on the beam to transfer the load to the large beam, concrete is placed on the floor slab and both are integrated to improve the quality of the slab. Is planned.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

According to the present invention, as shown in FIG. 1, small beams 2 and 2 made of precast concrete are installed in two directions between large beams 1 and 1 in two directions, and a plurality of planes surrounded by the large beams 1 and 1 are uniformly distributed. The floor is divided into individual planes, the floor slab 3 made of precast concrete is laid on the plane of each divided minimum unit, and the concrete 4 is filled between the adjacent floor slabs 3 on the beam 2. This is a method of constructing the slab 6 by integrating the plates 3 and 3 with each other.

FIG. 1 shows a case where the plane surrounded by the girders 1 and 1 is divided into four, and one of the girders 2 (y direction) has a length spanning between the facing girders 1 and 1. An end portion 21 to which the beam 2 in the orthogonal direction (x direction) is connected is formed in the middle portion.

As shown in FIG. 2 which is a sectional view taken along the line aa of FIG. 1, the beam 2 in the y direction is supported by a receiving portion 11 projecting from the side surface of each beam 1, and the beam 2 in the x direction is provided. Is similarly bb of FIG.
As shown in FIG. 3 which is a sectional view taken along the line,
It is supported by a receiving portion 211 formed at the end 21 of the cross beam 2.

As shown in FIG. 5, which is a partially enlarged view of FIG. 2, the beam 2 in the y-direction has a cotter 12 projecting from the receiving portion 11 of the girder 1 in an insertion hole 22 opened at the end thereof. The x-direction beam 2 is also inserted into the through hole 22 so as to project into the receiving portion 211 of the beam 2 and the partially enlarged views of FIGS. 6 and 7. Large beam 1 cotter as shown
By inserting 12, it will be prevented from slipping during installation. A filler is filled in the insertion hole 22 after installation.
Inside the beam 2 in the x direction, a PC steel material 5 penetrating the beam 2 in the y direction is arranged as shown in the drawing, and the PC steel material 5 is tensioned and prestressed so that the beam 2 is moved in the y direction. It is connected to the beam 2 of and integrated. Anticorrosion treatment is applied to the PC steel material 5.

The floor slab 3 has an area larger than the minimum unit plane surrounded by the girders 1 and the girders 2, and as shown in FIG. 4 which is a sectional view taken along the line cc of FIG. By placing it on the top of beam 2, vertical load is applied to the surrounding large beam 1 and small beam 2.
Distribute evenly over the burden. The load carried by the beam 2 is transmitted to the beam 1 to which it is connected.

As shown in FIGS. 1 and 4, the concrete 4 is filled between the adjacent slabs 3 and 3 on the large beam 1 and the small beam 2 to ensure the continuity of the slabs 3 and 3, The plates 3 and 3 are integrated with each other. The slabs 3 and 3 are connected to the girder 1 and the girder 2 while being integrated with each other by the concrete 4, and the girder 1 and the girder 2 are also integrated to increase the in-plane rigidity of the slab 3 and act on the slab 3. The horizontal load is transmitted to the girder 1 and the girder 2. Concrete 4 between floor slabs 3 and 3 is shown in Figs.
As shown in FIGS. 8 and 9 which are partially enlarged views of FIG. 4, the beams 1 and the girders for horizontal loading are integrated by stirrup 13 and 23 protruding from the top ends of the girder 1 and the girder 2, respectively. Two
Enable communication to.

In the embodiment, in order to increase the resistance and rigidity of the beam 2 to the vertical load, the PC steel material 5 is arranged inside the beam 2 in the y direction in addition to the beam 2 in the x direction. Beam 2 is prestressed. Since the cross beam 2 in the y direction has a length that extends between the cross beams 1 and 1,
Since the cross beam 2 in the x direction is installed on site between the cross beam 1 and the cross beam 2 in the y direction, prestress is given by the post tension. Figure 3 shows the PC steel material 5 in the beam 2 in the x direction.
By arranging the convex beams downward as shown in FIG. 5, upward stress is generated in advance in the beam 2, and the beam 2 in the x direction is subjected to y.
It has a function to bear a part of the stress generated in the beam 2 in the direction.

10 to 12 show the case where the in-plane rigidity of the slab 6 is increased by placing concrete 4 on the floor slab 3 at the same time as between the adjacent floor slabs 3 and 3 and the quality thereof is enhanced. It shows an example. The concrete 4 is placed after the reinforcement is laid on the floor slab 3. 10, 11, and 12 are a- of FIG.
It corresponds to cross-sectional views taken along line a, line bb, and line cc.

FIGS. 13 and 14 show an embodiment in which a plane surrounded by two-direction girders 1 and 1 is divided into nine parts, and concrete 4 is also placed on the floor slab 3. In this case as well, the construction is carried out in the same manner as in the case of dividing into four, but in the embodiment, the beam 2 in the y direction having a length spanning the girders 1 and 1 is attached to the beam 2 in the x direction connected to the beam 1. It is integrated in advance to simplify on-site work.

[0020]

As described above, the present invention is as described above. Precast concrete beamlets are erected in two directions between beam beams in two directions, and the plane surrounded by the beam beams is evenly divided. A slab made of precast concrete is laid on the plane of the unit, and since the four sides of the slab are supported by large beams and small beams, vertical loads can be evenly distributed and transmitted to the large beams in two directions. .

Further, concrete is filled between adjacent floor slabs on the beam, and while the floor slabs are integrated with each other, the peripheries of the respective floor slabs are connected to the beam and the girder, and both are integrated, so that the floor slabs are integrated. Horizontal loads can be distributed and transmitted to the two-direction girders without the need for placing concrete on top.

Furthermore, the quality of the slab can be improved by placing concrete on the floor slab.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is a sectional view taken along line bb of FIG.

FIG. 4 is a sectional view taken along line cc of FIG.

5 is an enlarged view of the girder portion of FIG. 2. FIG.

FIG. 6 is an enlarged view of the girder portion of FIG.

FIG. 7 is a plan view of FIG.

FIG. 8 is an enlarged view of the girder portion of FIG.

FIG. 9 is an enlarged view of the beam portion of FIG.

FIG. 10 is a sectional view taken along the line aa in FIG. 1 when concrete is cast on the floor slab.

FIG. 11 is a cross-sectional view taken along the line bb of FIG. 1 when concrete is placed on the floor slab.

FIG. 12 is a cross-sectional view taken along the line cc of FIG. 1 when concrete is cast on the floor slab.

FIG. 13 is a plan view showing an embodiment in which a plane surrounded by a crossbeam is divided into nine parts.

14 is a cross-sectional view taken along the line dd of FIG.

[Explanation of symbols]

1 …… Large beam, 11 …… Receiving part, 12 …… Cotter, 13 …… Star lap, 2 …… Small beam, 21 …… End part, 211 …… Receiving part, 22 …… Insertion hole, 23 …… Star Rap, 3 ... floor slab,
4 …… Concrete, 5 …… PC steel, 6 …… Slab.

Claims (2)

[Claims] 1. A precast concrete beam is installed in two directions between two-direction girders, and the plane surrounded by the girder is evenly divided into a plurality of planes, and the plane of each divided minimum unit. A method for constructing a slab in which a slab made of precast concrete is laid on top of the slab, and then concrete is filled between adjacent slabs on the beam to integrate the slabs with each other. 2. The method for constructing a slab according to claim 1, wherein after laying the slab, concrete is placed between adjacent slabs on the beam and on the slab to integrate the slab with the concrete.