JP7341051B2 - slab structure - Google Patents

Description

The present invention relates to slab structures.

Patent Document 1 discloses a technology related to a factory floor structure. In this prior art, precast concrete unit floor plates are removably installed in a section whose four edges are surrounded by supports such as underground beams and foundation beams.

Japanese Unexamined Patent Publication No. 62-41861

However, providing a removable floor plate reduces the rigidity of the entire slab.

In view of the above-mentioned facts, the present invention aims to suppress a decrease in the rigidity of the entire slab even if a removable floor plate is provided.

In the first aspect, a small beam is provided in at least a cross shape in a plan view inside a large beam surrounded by a rectangular shape in a plan view, and the small beam is removably provided in an opening surrounded by the large beam and the small beam. A slab structure comprising a girder and a floor plate supported by a receiving part provided on the side surface of the girder.

In the first aspect, the opening can be easily provided by removing the removable floorboards supported by the receiving parts provided on the side surfaces of the girders and the small beams. Additionally, a removable floorboard can be attached to easily close the opening. Note that by providing at least a cross-shaped beam in a plan view inside the large beam, a decrease in the rigidity of the entire slab can be suppressed even if a removable floorboard is provided.

A second aspect is the slab structure according to the first aspect, including a first area configured with the floorboard, and a second area provided outside the first area and configured with a hard floor.

In the second aspect, the rigidity of the entire slab is improved by providing a second region made of a rigid floor outside the first region made of floorboards.

A third aspect is the slab structure according to the first aspect or the second aspect, wherein an adjustment mechanism is provided at an end of the floor plate to adjust the height of the floor plate using the receiving part as a reaction force receiver.

In the third aspect, the height of the floorboard can be easily adjusted by using the receiving part as a reaction force receiver using the adjustment mechanism provided at the end of the floorboard.

According to the present invention, even if a removable floor plate is provided, a decrease in the rigidity of the entire slab can be suppressed.

FIG. 2 is a vertical cross-sectional view schematically showing a vertical cross-section of the building along the X direction. FIG. 3 is a plan view of the first region of the slab. FIG. 3 is an enlarged vertical cross-sectional view along the X direction of a main part of the first region of the slab. FIG. 3 is a plan view showing a first region and a second region in the slab. (A) is a perspective view of the slab of the first comparative example, (B) is a plan view of the slab of the first comparative example, and (C) is the frequency (Hz) and stiffness of the slab of the first comparative example. (N/m). (A) is a perspective view of the slab of the second comparative example, (B) is a plan view of the slab of the second comparative example, and (C) is the frequency (Hz) and stiffness of the slab of the second comparative example. (N/m). (A) is a perspective view of the first region of the slab of the embodiment, (B) is a plan view of the first region of the slab of the embodiment, and (C) is a vibration in the first region of the slab of the embodiment. It is a graph showing the relationship between frequency (Hz) and stiffness (N/m).

<Embodiment>
A slab structure according to an embodiment of the present invention will be described. Note that two orthogonal directions in the horizontal direction are referred to as the X direction and the Y direction, which are indicated by arrows X and Y, respectively. Further, the vertical direction perpendicular to the X direction and the Y direction is defined as the Z direction, and is indicated by an arrow Z.

[structure]
First, the structure of a slab to which the slab structure of this embodiment is applied will be explained.

The building 10 of this embodiment shown in FIG. 1 is a factory, the first layer 12 is a distribution/air conditioning area, and the second layer 14 is a production area. The slab 102 to which the slab structure 100 of this embodiment is applied constitutes the floor (single layer ceiling) of the second layer 14.

As shown in FIG. 4, the slab 102 of this embodiment is made of reinforced concrete and has a first region 110 that is rectangular in plan view and a second region 120 provided outside the first region 110. ing. The second region 120 of this embodiment has a substantially U-shape in plan view.

The first region 110 in the slab 102 is comprised of a plurality of removable floorboards 200 (see FIGS. 1 and 2), which will be described later. Moreover, the substantially U-shaped second region 120 of the slab 102 is a rigid floor. In addition, a rigid floor is a floor that has the necessary rigidity and strength against horizontal loads in terms of structural calculations.

As shown in FIGS. 1 and 2, the first region 110 in the slab 102 is supported by the girders 150 and the small beams 180. The girder 150 is installed on the pillar 50, and the small beam 180 is installed on the girder 150 (see also FIGS. 7(A) and 7(B)). Further, as shown in FIG. 2, the small beam 180 is provided in a cross shape in plan view inside the rectangular shape in plan view surrounded by the large beam 150 (see also FIGS. 7(A) and 7(B)). ). In addition to the cross-shaped cross-shaped beam 180 in plan view, a beam 180 extending along the Y direction and a beam 180 extending along the X direction may be provided. In short, it is sufficient that the small beams 180 are provided at least in the shape of a cross in plan view.

As shown in FIGS. 1 and 2, a floor plate 200 is removably provided in each of the plurality of openings 130 surrounded by the large beams 150 and small beams 180 (FIGS. 7(A) and 7(B)). ). Note that the pillars 50, the large beams 150, and the small beams 180 of this embodiment are made of concrete, and the floorboard 200 is made of precast concrete. Note that a "large beam" is a beam installed on a pillar, and a "small beam" is a beam installed on a main beam. Further, the floorboard 200 is not specified to be made of precast concrete. For example, a steel floor plate may be used. In short, any structure may be used as long as the rigidity of the floorboard is ensured.

As shown in FIG. 3, main reinforcements 202 and distribution reinforcements 204 are arranged on the floorboard 200. Furthermore, main beam reinforcements 140 and shear reinforcing bars 142 are arranged in the large beam 150 and the small beam 180. Note that although FIG. 3 is a cross-sectional view of the large beam 150, the small beam 180 also has a similar structure, so the reference numerals for the small beam 180 are given in parentheses.

As shown in FIGS. 2 and 3, receiving portions 250 are formed on the side surface 152 of the large beam 150 and the side surface 182 of the small beam 180. The receiving portion 250 protrudes outward from the side surfaces 152 and 182, and the end portion 210 of the floorboard 200 is placed on and supported by the receiving portion 250. In this embodiment, the receiving portion 250 is formed over substantially the entire area of the side surface 152 of the large beam 150 and the side surface 182 of the small beam 180 in the beam direction.

As shown in FIG. 3, in this embodiment, the large beam 150 and the small beam 180 include a receiving section side main reinforcement 252 that is embedded in the receiving section 250 and extends in the beam direction, and a beam that surrounds the receiving section side main reinforcing section 252. Receiver side shear reinforcing bars 254 are buried at intervals in the direction.

An adjustment mechanism 300 is provided at the end 210 of the floorboard 200 to adjust the height of the floorboard 200 using the receiving part 250 as a reaction force receiver. The adjustment mechanism 300 includes a female screw member 302 and a bolt 310. The female screw member 302 has a cylindrical shape and is embedded in and penetrates the end portion 210 of the floorboard 200. Further, the female screw member 302 has a cylindrical portion 304 and a female screw portion 306 provided below the cylindrical portion 304 .

The bolt 310 is inserted into the female thread member 302 and screwed into the female thread portion 306. Further, the lower end portion 312 of the bolt 310 protrudes downward from the lower surface 212 of the end portion 210 of the floorboard 200 and is in contact with the receiving portion 250 . In this embodiment, a plate material 260 is embedded in the upper end portion of the receiving portion 250, and the lower end portion 312 of the bolt 310 is in contact with the upper surface of the plate material 260. Further, a head 314 at the upper end of the bolt 310 projects upward from the upper surface 214 of the floorboard 200.

By adjusting the amount of screwing of the bolt 310 into the female threaded portion 306, the amount of protrusion of the lower end portion 312 that protrudes from the lower surface 212 of the floor plate 200 is adjusted. The height adjustment of the top surface 214 of 200 is made.

After adjusting the height, filler such as mortar is filled between the lower surface 212 of the end 210 of the floor board 200 and the receiving part 250, and after hardening, the bolts 310 are removed or the filler material protrudes from the upper surface 214 of the floor board 200. Cut the pieces. Then, after the bolt 310 is removed or cut, the female threaded member 302 is filled with a filler material. In addition, the gap between the end 210 of the floorboard 200 and the side surface 152 of the main beam 150 and the side surface 182 of the small beam 180 is also filled with the filler.

Note that the end portion 210 of the floorboard 200 is placed on a receiving portion 250 formed on the side surface 152 of the main beam 150 and the side surface 182 of the small beam 180. In addition, the floorboard 200 is only filled with a filler material in the gap between the end portion 210 and the side surface 152 of the main beam 150 and the side surface 182 of the small beam 180, and the large beam 150 and the small beam 180 are not firmly connected. Not yet. Therefore, it can be removed to the floorboard 200.

[Action and effect]
Next, the functions and effects of this embodiment will be explained.

The opening 130 can be easily provided in the slab 102 by removing the removable floorboard 200 supported by the receiving parts 250 provided on the side surface 152 of the girder 150 and the side surface 182 of the small beam 180. Further, the opening 130 can be easily closed by attaching the removable floor plate 200.

Here, as mentioned above, the building 10 of this embodiment is a factory, the first layer 12 is a distribution/air conditioning area, the second layer 14 is a production area, and the slab 102 of this embodiment is It constitutes the floor of the second layer 14 (the ceiling of the first layer 12). Therefore, when changing the production line in the production area of the second layer 14, etc., by removing the floor plate 200, the opening 130 for the vertical conveyor can be easily provided in the slab 102 in a short period of time, and the production The opening 130 can be easily closed in a short time after the line change or the like is completed.

Moreover, by providing the small beams 180 in a cross shape in plan view inside the large beams 150, even if the removable floorboard 200 is provided on the slab 102, a decrease in the rigidity of the entire slab 102 is suppressed. Note that the details of improving the rigidity of the entire slab 102 by providing the small beams 180 in a cross shape in plan view inside the large beams 150 will be described later.

Furthermore, the slab 102 of the present embodiment has a second region 120 formed of a rigid floor that is approximately U-shaped in plan view on the outside of the first region 110 formed of the floorboard 200, thereby increasing the rigidity of the entire slab 102. further improves.

Furthermore, the height of the floorboard 200 can be easily adjusted by using the adjustment mechanism 300 provided at the end portion 210 of the floorboard 200 using the receiving portion 250 as a reaction force receiver. In other words, the receiving part 250 has two functions: as a support member for the floorboard 200 and as a reaction force receiving function during height adjustment.

(About improving rigidity by cross-shaped beams in plan view)
Next, it will be explained that the rigidity of the entire slab 102 is improved by providing the small beams 180 in a cross shape in plan view inside the large beams 150.

Here, FIGS. 5A and 5B show model diagrams of a slab 502 of a first comparative example in which a small beam 580 is constructed only along the Y direction. Note that reference numeral 530 is an opening in the first comparative example, and reference numeral 500 is a floorboard in the first comparative example. Further, in order to make it easier to understand, some of the floorboards 500 are made darker with dots.

FIGS. 6A and 6B show model diagrams of a slab 602 of a second comparative example in which a small beam 680 is installed only along the X direction. Note that reference numeral 630 is an opening in the second comparative example, and reference numeral 600 is a floorboard in the first comparative example. Similarly, to make it easier to understand, some of the floorboards 600 are darkened with dots.

FIGS. 7(A) and 7(B) illustrate model diagrams of the first region 110 of the slab 102 of this embodiment, in which small beams 180 are constructed in a cross shape along the X direction and the Y direction. There is. Similarly, in order to make it easier to understand, some of the floorboards 200 are made darker with dots.

5(C), FIG. 6(C), and FIG. 7(C) show the vibration frequencies in the first region 110 of the slab 502 of the first comparative example, the slab 602 of the second comparative example, and the slab 102 of the present embodiment. The relationship between stiffness (Hz) and stiffness (N/m) is shown. Note that FIG. 7(C) shows the relationship between the frequency (Hz) and stiffness (N/m) in the case of only the first region 110 without the second region 120 (see FIG. 4). There is.

K1 in FIG. 5(C), FIG. 6(C), and FIG. 7(C) is the center part of the small beam 580, the small beam 680, and the small beam 180, respectively, and K2 is the center part of the floor plate 500, the floor plate 600, and the floor plate 200, respectively. It is the central part. Note that the positions corresponding to K1 and K2 are shown in FIG. 5(A), FIG. 5(B), FIG. 6(A), FIG. 6(B), FIG. 7(A), and FIG. 7(B), respectively. There is.

From the graphs of FIGS. 5(C) and 6(C), the slab 502 of the first comparative example and the slab 602 of the second comparative example have the central part K1 of the small beam 580 and the small beam 680, The stiffness (N/m) of the central portion K2 is lower than 100 N/μm.

On the other hand, in the slab 102 of this embodiment, the stiffness (N/m) of the central portion K1 of the small beam 18 is higher than 100 N/μm as shown in the graph of FIG. 7(C). Further, the stiffness (N/m) of the central portion K2 of the floorboard 200 is only slightly lower than 100 N/μm.

Therefore, the rigidity in the X direction is higher than that of the slab 502 of the first comparative example in which the small beams 580 are installed only along the Y direction and the slab 602 of the second comparative example in which the small beams 680 are installed only along the X direction. It can be seen that the slab 102 of this embodiment, in which the small beams 180 are installed in a cross shape along the Y direction, has high rigidity.

<Others>
Note that the present invention is not limited to the above embodiments.

For example, in the slab 102 of the above embodiment, the second region 120 provided outside the first region 110 made up of the floorboard 200 has a substantially U-shape in plan view, but the present invention is not limited to this. For example, the second region 120 may be L-shaped in plan view, or may be provided around the entire circumference of the first region 110.

Alternatively, the slab 102 may be composed only of the first region 110 composed of the floorboard 200.

Further, for example, in the embodiment described above, the receiving portion 250 is formed over substantially the entire area in the beam direction of the side surface 152 of the large beam 150 and the side surface 182 of the small beam 180, but is not limited thereto. The receiving portion 250 may be formed only on a portion of the side surface 152 of the large beam 150 and the side surface 182 of the small beam 180 in the beam direction.

Further, for example, the adjustment mechanism 300 that adjusts the height of the floorboard 200 is not limited to the above mechanism. Any mechanism may be used. Moreover, it is not necessary to have an adjustment mechanism for adjusting the height of the floorboard 200.

Further, for example, in the above embodiment, the slab 102, the large beam 150, and the small beam 180 are made of reinforced concrete, but are not limited to this. For example, they may be of steel reinforced concrete construction.

Further, for example, although the building 10 to which the slab structure 100 of the above embodiment is applied is a factory, the present invention is not limited to this. The present invention can also be applied to slabs of buildings other than factories.

Furthermore, the invention may be implemented in various ways without departing from the spirit of the invention.

10 Building 50 Column 100 Slab structure 102 Slab 110 First area 120 Second area 130 Opening 150 Main beam 152 Side 180 Small beam 182 Side 200 Floor plate 210 End 250 Receiving part

Claims (2)

Large beams arranged in a rectangular shape in plan view,
a small beam provided at least in the shape of a cross in plan view in an area surrounded by the large beam ;
a receiving portion provided on a side surface of the large beam and the small beam and protruding inward of an opening defined by the large beam and the small beam ;
a floorboard whose four sides are removably supported by the receiving part , and which closes the opening and becomes flush with the upper surfaces of the main beam and the small beam ;
Slab structure with. An adjustment mechanism is provided at an end of the floorboard to adjust the height of the floorboard by using the receiving part as a reaction force receiver,
The adjustment mechanism is
a cylindrical female screw member that vertically penetrates the end of the floorboard;
a bolt inserted and screwed into the female threaded member from above;
has
adjusting the height of the floor plate by adjusting the screwing amount of the bolt;
A slab structure according to claim 1.