JP4501010B2 - Floor structure of multistory parking lot - Google Patents

Description

  The present invention relates to a floor structure of a multilevel parking lot.

  Post-tensioned prestressed concrete beams and post-tensioned prestressed concrete as a floor structure that can increase the storage efficiency of the vehicle and improve the field of view in the multistory parking lot, and at the same time ensure sufficient strength and durability of the roadway A floor structure of a parking lot using a floor slab made of is known (for example, see Patent Document 1).

Japanese Patent No. 3119635

  In the technique using the post-tension type prestressed concrete (PC) described in Patent Document 1, in the construction site, the PC steel material is stretched in a relaxed state curved in a concave shape, and concrete is placed there. Since the complex process of applying stress to the concrete by tensioning the PC steel after the concrete is completely hardened, there is a problem that the construction period becomes long and the construction cost becomes high. In addition, the construction management is not easy because it is necessary to carefully perform the work of applying a predetermined stress to the concrete by tensioning the PC steel material at the construction site.

  The present invention has been made in view of the above circumstances, and can secure sufficient strength and durability, improve material work efficiency by saving materials and shortening the work period, and reduce quality by controlling items. An object of the present invention is to provide an easy floor structure of a multistory parking lot.

First, a reference example is shown.
[1] In a floor structure of a three-dimensional parking garage comprising a floor slab supported by a pillar disposed on the outer periphery of a parking lot, and a passenger compartment grid and a roadway formed on the floor slab, the space between the pillars A beam supporting a floor slab is provided, and the floor slab is constituted by a precast concrete plate laid between the beams and introduced with a predetermined prestress, and concrete placed on an upper surface of the precast concrete plate. The floor structure of a multi-storey car park.
[2] The floor structure of a multilevel parking garage according to [1], wherein a cross section of the precast concrete plate has a channel shape or a shape with protrusions.
In order to solve the above problems, the present invention has the following features.
[3] A plurality of wall rows arranged in parallel with each other at a predetermined interval are arranged at a predetermined interval to support a floor slab, and a vehicle compartment grid and a vehicle are mounted on the floor slab. A floor structure of a multilevel parking garage in which a road is formed, wherein the wall row is composed of a reinforced concrete structure bearing wall, the floor slab is composed of a hollow slab provided between the bearing walls, and the hollow slab is A reinforced concrete slab in which a hollow portion is provided by a void embedded in reinforced concrete, and the hollow slab is disposed with the void direction changed, and the front load-bearing wall and the hollow slab In the joint portion, the reinforced concrete constituting the load-bearing wall and the reinforced concrete constituting the hollow slab are integrally joined and rigidly joined.

(1) In the reference examples [1] and [2] above, the floor slab is formed by forming columns and beams. Pre-stressed concrete plates laid between the beams are pre-stressed so that they have high rigidity, long-term creep deflection is extremely low, and they are strong against cracks, so that sufficient strength and durability are ensured. Can do.

  (2) Because the pre-stressed concrete plate laid between the beams is pre-stressed, it is highly rigid, and even if the distance between the beams is long, the floor slab can be constructed without supporting work, and the supporting work is installed. Is unnecessary.

  (3) Since a precast concrete board is used, the curing time at the construction site is omitted, and the construction period is greatly shortened.

  (4) Construction management is easy because there is no need for a work that needs to be performed carefully, such as tensioning the PC steel at the construction site and applying a predetermined stress to the concrete.

  (5) In the above [3], this structural type in which the bearing walls are provided between the parking spaces and the hollow slab is provided between the bearing walls is generally called a “void ramen structure”. The feature of this structural type is effective for the lower end tension of the slab, which is a characteristic of the conventional hollow slab, unlike the precast concrete plate, and by using this, the bearing wall and the hollow slab are rigidly joined, A ramen frame consisting of walls and slabs can be formed.

  (6) This structural type, which uses a conventional hollow slab as a floor slab with a bearing wall between the parking spaces, requires no columns and beams, and can create spaces without columnar and beam types. is there. Therefore, the dead space can be reduced by omitting the columnar shape, and the floor height can be reduced by omitting the beam shape. Moreover, since the building is formed by a continuous box such as a match box, it is possible to simplify the formwork and improve the workability.

  (7) The hollow slab can reduce the load by embedding voids in the cast-in-place concrete slab to reduce the load by making a hole in the center of the cross section where the necessity is low. It is an aggregate of beams.

  (8) The load-bearing walls provided between the parking spaces are aggregates of columns that support a vertical load and simultaneously bear a horizontal force in the thickness direction of the wall rigidly joined to the hollow slab. In addition, since this wall bears stress in the thickness direction, the wall thickness tends to be thicker than that of a normal load bearing wall, so if there are many floors in a building, the load can be reduced by embedding a hollow tube in the center of the wall. Reduction can be achieved.

  (9) The problem with this type of structure is that the frame structure is made up of a thin floor (hollow slab) and bearing walls compared to columns and beams, so the horizontal rigidity is reduced during an earthquake. The problem can be solved by making the handrails on the outer periphery of the building reinforced concrete and using it as a beam to improve the rigidity of the building. Moreover, about the fall of the shear strength of the junction part of a hollow slab and a load-bearing wall, what is called a junction part panel, it can solve by providing a haunch in a hollow slab end part.

Embodiments and reference examples of the present invention will be described with reference to the drawings.

1 is a schematic plan view showing a floor structure of a reference floor of a parking lot as a reference example , FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a perspective view showing a precast concrete board used in the reference example .

  As shown in FIG. 1, a plurality of support columns 1 are erected and arranged so as to surround the outer periphery of the parking lot. An outer beam 2 is horizontally provided between the adjacent columns 1 and 1 so as to surround the outer periphery of the parking lot. Inside the parking lot surrounded by the outer beam 2, a beam 3 is provided horizontally between the right column 1 and the left column 1 shown in FIG. 1.

  On the upper surface of the beam 3, a precast concrete plate 10 with prestress introduced as shown in FIGS. 3 and 4 is stretched between the beam 3 and the beam 3. A plurality of precast concrete plates 10 spanned between 3 and 3 are laid in a line from the left outer beam 2 to the right outer beam 2 shown in FIG. As shown in FIGS. 3 and 4, the PC steel material 11 is disposed on the rib portion of the precast concrete plate 10, and thus prestress is introduced.

As shown in FIGS. 3 and 4, in the reference example , a concave precast concrete plate having a channel shape and having a groove is used. As shown in FIG. 4, the single piece of the precast concrete board 10 is configured in two rows so as to have two grooves. Thus, since each of the precast concrete boards 10 is a size that can be easily transported, Laying work is easy.

  On the upper surface of the plurality of precast concrete plates 10 laid in this way, upper end bars 21 and lower end connecting bars 22 (only end portions) arranged orthogonal to each other are arranged, and concrete 20 is placed. ing. A floor slab 4 is formed by the concrete 20 and the precast concrete plate 10 thus placed. Such concrete 20 and precast concrete board 10 constitute a half PC floor board. Furthermore, on the floor slab 4, a vehicle compartment grid and a roadway are formed to form a floor structure of a parking lot. As shown in FIG. 1, a large number of parking rooms 5 are formed in a three-dimensional parking lot.

In the reference example , a predetermined prestress is introduced into the precast concrete board 10, and since it has a channel-shaped cross section with a high section modulus, it has a floor structure with very high rigidity, High strength and durability.

  Moreover, by using the precast concrete board 10, a floor slab can be constructed without using a support even if the distance between the beam 3 and the beam 3 is long, and a process of installing the support is unnecessary. . Furthermore, since the concrete curing time at the construction site is omitted, the construction period is significantly shortened. For example, in the construction method such as the invention described in Patent Document 1, what took 10 days is reduced to about half of 5 days.

  Furthermore, since the work which needs to be performed carefully, such as tensioning the PC steel at the construction site and applying a predetermined stress to the concrete, is unnecessary, the construction management is also easy.

(Reference Example 1)
In the reference example , a precast concrete plate having a channel-shaped cross section is used, but as a reference example 1 , a cross-sectional shape having a protrusion as shown in FIG. An effect can be obtained. In FIG. 5, 12 is the precast concrete board by which PC steel material 13 is arrange | positioned at the rib part. 23 is concrete cast on the upper surface of the precast concrete board 12, 24 is an upper end main reinforcement, and 25 is an upper end distribution bar.

(Reference Example 2)
Moreover, in the reference example 2 shown in FIG. 6, the thing with the shape in which the cross section attached the protrusion is used, However, The hollow part 30 is provided between the ribs of the precast concrete board 15. FIG. 16 is a PC steel material disposed on the rib portion, 26 is concrete cast on the upper surface of the precast concrete plate 15, 27 is an upper principal bar, 28 is an upper end reinforcement, and 29 is an FR plate.

(Reference Example 3)
In some cases, the section modulus slightly decreases, but a pre-cast concrete plate having a flat section as shown in FIG. 7 can also be used. In FIG. 7 showing Reference Example 3 , reference numeral 17 denotes a precast concrete plate having a flat cross section in which the PC steel material 18 is arranged. 31 is concrete cast on the upper surface of the precast concrete plate 17, 32 is a truss bar, and 33 is a hollow portion made of a mold.

FIGS. 8-14 is drawing which shows the floor structure of the parking lot which concerns on the Example of this invention, FIG. 8 is a partially notched top view which shows the floor structure of the reference | standard floor of a parking lot, FIG. 8 is a cross-sectional view taken along the line C-C of FIG. 8, FIG. 10 is a cross-sectional view taken along the line D-D of FIG. 8, FIGS. FIG. 14 is a partial cross-sectional view of a hollow slab for explaining an I-shaped beam constituting the hollow slab.

  The bearing wall 41 has a reinforced concrete structure made of reinforced concrete 44 in which reinforcing bars 46 are arranged, and has a height of five floors (the fifth floor is a rooftop), with a predetermined interval required for a parking space. Stands vertically from the ground. A plurality of load bearing walls 41a are arranged in parallel with each other, a plurality of load bearing walls 41b are also arranged in parallel with each other, and the rows in which the load bearing walls 41a are arranged and the rows in which the 41b are arranged are also arranged at predetermined intervals. Are parallel to each other.

A hollow slab 42 is horizontally provided between the load-bearing walls 41 at the height of each floor including the rooftop (excluding the first floor). The hollow slab 42 is a reinforced concrete slab in which a hollow portion (hole) is provided by a hollow tube made of a void 48 embedded in parallel in a concrete 45 in which reinforcing bars 47 are arranged. Note that the partially cutaway plan views of FIGS. 8 and 13 show the orientation of the void 48 embedded in the concrete 45. As shown in FIG. 8, the hollow slab 42 is arranged by changing the direction of the void 48 . Further, FIG. 13 is different from FIG. 8 in the arrangement and orientation of the voids 48. As the void 48, a void having a circular cross section or a winding pipe is used. As shown in FIG. 13, some of the voids 48 may be solid 48a. Thus, the hollow slab 42 provided with the hollow portion (hole) is formed by the void 48 embedded in the concrete 45. As shown in FIG. 14, the hollow slab 42 is an aggregate of I-shaped beams composed of voids 48 and concrete 45.

  As shown in FIGS. 11 and 12, in the joint portion between the load-bearing wall 41 and the hollow slab 42, the reinforced concrete 44 in which the reinforcing bars 46 constituting the load-bearing wall 41 are arranged, and the reinforced concrete 45 constituting the hollow slab 42. Thus, the load-bearing wall 41 and the hollow slab 42 are rigidly joined. Further, since a large shearing force is generated at the joint during an earthquake, a haunch 43 is provided at the lower part of the end of the hollow slab 42.

  Unlike the precast concrete board, the concrete hollow slab 42 used for the floor slab in this embodiment is known to be effective for lower end tension of the slab. Using this characteristic, a rigid frame composed of the load bearing wall 41 and the hollow slab 42 is formed by rigidly bonding the load bearing wall 41 and the hollow slab 42 at the joint portion.

  On the floor slab 6 formed of such a hollow slab 42, a vehicle compartment grid and a roadway are formed, and a floor structure of a parking lot is configured. The passenger compartment grid and the roadway are floor structures formed of slab beam structures.

  The structural form shown in the present embodiment eliminates the use of columns and beams because the load bearing wall 41 functions as a column (column wall) and also as a beam. In addition, because it is composed of a bearing wall and a hollow slab, it is possible to create a space without columns and beams, reducing dead space by omitting columns and reducing floor height by omitting beams. Is possible. Furthermore, since the building of the multi-story parking lot is formed by a continuous box such as a match box, it is possible to simplify the formwork and improve the workability.

  As shown in FIGS. 13 and 14, the hollow slab 42 can reduce the load by embedding a void 48 in the concrete 45 so as to open a hole (hollow part) in the central part of the cross section having a low necessity. In this direction, the I-beams (see FIG. 14) effective for bending are aggregated.

  The load-bearing wall 41 is rigidly joined to the hollow slab 42 at the same time as supporting a vertical load, and is a set of columns that bear a horizontal force in the thickness direction of the load-bearing wall 41. In addition, since the load bearing wall 41 bears stress in the thickness direction, the wall thickness tends to be thicker than a normal load bearing wall. Therefore, when the number of floors of a building is large, a hollow tube is provided at the center of the wall. The load can be reduced by embedding.

  The problem with this structure is that the frame structure is made up of thinner floors and walls than columns and beams, so the horizontal stiffness is reduced during an earthquake. Therefore, this problem can be solved by using a reinforced concrete railing on the outer periphery of the parking lot building and using it as a beam for improving the rigidity of the building. Moreover, about the fall of the shear strength of the junction part of the hollow slab 42 and the load-bearing wall 41, what is called a junction panel, it can solve by providing the haunch 43 in a hollow slab end part.

It is a schematic plan view which shows the floor structure of the reference | standard floor of the parking lot as a reference example . It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a perspective view which shows the precast concrete board whose cross section used in a reference example is a channel shape. It is a perspective view illustrating a precast concrete plate having a shape cross-section used in Example 1 with a protrusion. It is a perspective view which shows the precast concrete board of the shape where the cross section used in the reference example 2 had the protrusion. It is a perspective view which shows the precast concrete board of the flat cross section used in the reference example 3. FIG. It is a partially notched top view which shows the floor structure of the reference | standard floor of the parking lot as an Example of this invention. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is side surface sectional drawing explaining the junction part of the load-bearing wall and hollow slab used in the Example of this invention. It is side surface sectional drawing explaining the junction part of the load-bearing wall and hollow slab used in the Example of this invention. It is a partially notched top view which shows the load-bearing wall and hollow slab which are used in the Example of this invention. It is a fragmentary sectional view of the hollow slab explaining the I-shaped beam which comprises the hollow slab used in the Example of this invention.

Explanation of symbols

1 strut 2 outer beams 3 beams 4 Floor slab 5 parking chamber 6 Floor slab 10 precast concrete plate 11 PC steel member 12 precast concrete plate 13 PC steel material <br/> 14 precast concrete plate 15 precast concrete plate 16 PC steel 17 precast concrete plate 18 PC steel material 20 Concrete 21 Upper end reinforcement 22 Lower end connection reinforcement 23 Concrete 24 Upper end reinforcement 25 Upper end reinforcement bar 26 Concrete 27 Upper extension reinforcement 28 Upper extension reinforcement 29 FR plate 30 Hollow part 31 Concrete 32 Truss reinforcement 33 Hollow part 41 Bearing wall 42 Hollow slab 43 Haunch 44 Concrete 45 Concrete 46 Reinforcement 47 Reinforcement 48 Void

Claims (1)

A plurality of wall rows arranged in parallel with each other at a predetermined interval are arranged at a predetermined interval to support a floor slab, and a vehicle compartment grid and a roadway are provided on the floor slab. A floor structure of a formed multistory parking lot,
The wall row is composed of a reinforced concrete structure bearing wall,
The floor slab is composed of a reinforced concrete slab in which a hollow portion is provided by a void embedded in the reinforced concrete,
And the direction of the void embedded in the floor slab in the vehicle compartment grid is a direction perpendicular to the load-bearing wall, while the direction of the void embedded in the floor slab in the roadway is parallel to the load-bearing wall. Therefore, the directions of the voids are arranged so as to be orthogonal,
The joint of the load-bearing wall and the floor slab in the passenger compartment grid is a solid parking garage in which the reinforced concrete constituting the load-bearing wall and the reinforced concrete constituting the floor slab are integrally joined and rigidly joined. Floor structure.

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