JPH0635074Y2 - Frame structure of multi-storey car park - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to the frame structure of a multistory parking lot, and in particular, one end of a beam that constitutes the floor of each layer of the multistory parking lot is supported between steel columns. The present invention relates to a frame structure of a multistory parking lot constructed by a precast concrete slab installed.

“Prior Art” As automobiles have become widely used in ordinary households, demand for parking lots for parking automobiles has increased. In particular, in urban areas, the lack of land has led to the adoption of multilevel parking lots. ing.

Conventionally, this type of multi-storey car park has, for example, horizontal parking floors with multiple floors, and the multi-storey car park has a structure in which these floors are connected by rampways, and a continuous sloping floor with a rising slope in the parking lot. There are two types of self-propelled parking lots.

These self-propelled multi-storey parking lots have many middle- and low-rise buildings in Japan, and their structures are reinforced concrete structures (RC structures), such as columns with SR depending on various conditions of individual buildings.
An appropriate structure such as C structure and S beam structure is selected and constructed.

By the way, in such a multi-storey parking lot, due to the structure in which the vehicle is parked in the parking space of each floor provided in a plurality of layers, sufficient consideration for safety such as vehicle fall prevention is required. It is obligatory to provide a waist wall to prevent falling. In addition, conventionally, in these buildings, as a seismic element, braces are bridged between columns,
It was a general structure to resist horizontal forces such as earthquakes and wind.

FIG. 7 shows an example of the structure of such a three-dimensional parking lot. That is, in this multilevel parking lot, the parking floors F ₁ and F ₂ having steps on the left and right are connected by the inclined road R, and the ALC is provided on the outer wall portion of the parking floors F ₁ and F _{2 on} each floor.
A waist wall W made of a plate or the like is attached, and further, a steel frame fence T is provided inside the waist wall W.

On the other hand, in this multi-storey parking lot, an earthquake-resistant element 1 composed of a pillar material 1a and a plow-shaped brace material 1b, and an independent pillar material 2 are erected in stages, and a beam is provided between these pillar materials. The materials 3a and 3b are erected to form the frames of the respective layers, and by laying the rectangular slab material 4 on the beam members 3a and 3b, the floors F ₁ and F ₂ are It is formed.

A plurality of layers having such a structure are stacked to form the parking lot shown in the figure. By the way, the pillar is made of SRC,
In the case of a parking lot with beams made of S, concrete is wound around the pillars 1a and 2 by arranging reinforcement, and the brace 1b and the beams 3a and 3b are After assembly, the fireproof coating (rock wool, silicate arsium plate, etc.) is coated.

“Issues to be solved by the device” However, in the multi-storey parking lot having such a complex structure, the following problems to be solved remain.

Firstly, in the conventional multi-story parking lot, the brace 1b and the beams 3a, 3b must be coated with a fireproof coating, so that the work efficiency is poor and the appearance is poor.

In particular, in the case of fireproof coating by spraying, deterioration of aesthetics is remarkable due to aging, and the fact that the fireproof coating material itself is harmful is strongly pointed out.

Secondly, as a waist wall, in the conventional example, since the ALC plate is attached to the beam (large beam) 3a located on the outer surface of the parking lot, the construction work takes time, and the structure of the outer peripheral portion of the parking lot is The problem is that it is complicated by walls and braces.

The present invention has been proposed in view of the above circumstances, and its purpose is to simplify the structure by omitting the brace material by using the girder constituting the frame as a waist wall made of precast concrete slab. An object of the present invention is to provide a frame structure of a multi-storey parking lot that can be made into a structure and can improve workability during construction.

"Means for solving the problem" Therefore, this invention is a multi-story parking lot in which one end of a beam that constitutes the floor of each layer of a multi-story parking lot is supported by a precast concrete slab installed between steel columns. In the frame structure, the precast concrete slab is composed of a main body portion provided with a connecting arm for connecting one end of the beam to the inner surface, and a fall prevention wall portion integrally formed on the upper side of the main body portion. In addition, joint fittings that are bolted to the steel column are provided on both joint end faces of the precast concrete slab.

The precast concrete slab is preferably one in which a PC steel material is embedded in the precast concrete slab to introduce prestress.

[Operation] According to this invention, the precast concrete slab for preventing fall is integrated with the steel column through the joint fittings at both ends of the precast concrete slab to resist horizontal forces such as earthquakes and winds. It can be used as a seismic element for parking lots instead of brace materials.

Further, since the precast concrete slab itself is a refractory structure and the whole is molded with a mold, the appearance is not impaired.

In addition, when constructing the frame, like the three-dimensional construction method using steel frames, after installing the precast concrete plate at a predetermined position between the columns, it can be easily connected to the steel column using the joint metal fittings of the joint surface, The beam can also be easily connected via the connecting arm of the main body.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing an outer wall portion of a multi-story car park having a frame structure according to this embodiment. The frame of this multi-storey car park is an SRC structure where the main pillar is formed by placing concrete around the steel frame pillar 10 at the site, and the beam 11 that receives the slab is an S structure made of H-shaped steel. However, the beam on the outer peripheral portion (that is, the large beam supporting the small beam 11) is constituted by a flat plate-shaped precast concrete slab 12.

The pre-cast concrete slab 12 can be used for the inner beam as well as the outer beam, but for the inner beam, if the structure is such that it is embedded in concrete, the precast Instead of the concrete slab 12, it may be made of H-shaped steel.

Further, in this frame structure, the precast concrete slab 12 is used as a waist wall of a parking lot and is also used as a seismic element of the outer wall portion.

In the following, the main members of these frame structures will be described in detail.The steel column 10 is provided with connecting arms 10a for connecting the beam 11 projecting for each layer, and each of these connecting arms 10a is provided. The beams 11 on each floor are joined together.

Further, the flange portion 10b facing the joint end surface of the precast concrete slab 12 is provided with a plurality of bolt insertion holes 13 penetrating the flange portion 10b, and a bolt 14 for fixing the precast concrete slab 12 is inserted. It has become so.

The lowermost end of the steel frame column 10 is fixed to the foundation of the parking lot via anchor bolts or the like, and is connected to the longitudinal direction of the steel column 10 via a joint plate 15.

Further, the beam 11 extends in the width direction of the road between the outer wall and the inner wall of the parking lot, and is arranged in parallel along the longitudinal direction of the road at a plurality of intervals. In the illustrated example, the beam 11 has an S structure made of H-shaped steel, but it can also be entirely made of precast concrete.

The precast concrete slab 12 that supports one end of the beam 11 includes a main body portion 12b having a connecting arm 12a that connects one end of the beam 11 to the inner surface, and a fall prevention member integrally molded on the upper side of the main body portion 12b. The wall portion 12c of the above, and the necessary reinforcing steel bars are placed in the mold and precast.

Then, above and below both joint end surfaces of the precast concrete plate 12, there are embedded inserts 16 to which the bolts 14 inserted into the bolt insertion holes 13 of the steel frame 10 are connected, and bolted to the steel column 10. The joint fitting T. Also, the main body of the precast concrete slab 12
On the inner surface between the wall 12c and the wall 12c, a step 12d for receiving the slab of the multi-story parking lot is provided.

The slab S in this multilevel parking lot is shown in Figs.
As shown in the figure and the like, concrete C is cast on the upper portion of the deck plate 20. In the illustrated example, as shown in FIG. 3, the deck plate 20 has a rib 20a formed by bending on the lower surface, and the rib 20a can bear the weight of the concrete C cast on the upper portion. It has sufficient rigidity.

Incidentally, the deck plate 20 is erected in a direction in which the rib 20a is orthogonal to the beam 11, and is placed and welded so that its end portion is engaged with the upper edge of the beam 11.

Reference numeral 25 in the figure denotes a stud bolt projectingly provided on the upper surface of the beam 11 and is provided to improve the adhesion between the beam 11 and the concrete C. Also,
Reference numerals 30 and 31 indicate a main muscle and a muscle to be arranged in the slab S, respectively.

Next, the construction procedure of the multi-storey parking lot having the above structure will be described. As shown in FIG. 1, first, after constructing a foundation (not shown), the steel column 10 is erected on this foundation, and the space between the steel columns 10 is installed. After connecting with the precast concrete slab 12, the beam 11 is connected between the precast concrete slabs 12 inside and outside of them.
Erection.

The connection between the precast concrete slab 12 and the steel column 10 is performed by hoisting the precast concrete slab 12 so that the insert 16 of the precast concrete slab 12 faces the bolt insertion hole 13 of the steel column 10 and the bolt insertion hole in the insert 16. It is a simple work to screw the bolt 14 through 13,
The connection between the precast concrete slab 12 and the beam 11 is made by connecting the beam 1 to the connecting arm 12a of the precast concrete slab 12.
Since it is a simple work of wrapping 1 and bolting them together, excellent workability can be exhibited without any change from that of the conventional frame structure constituted by a large beam as a steel frame.

To construct the slab S on each floor, after arranging the deck plate 20 on the upper part of the above-mentioned beam 11, the deck plate 20
Main reinforcement 30 and distribution muscle 31 are arranged on the upper surface of the concrete C
Can be hit on site.

Further, the main pillars of the multi-story parking lot made of steel-framed reinforced concrete are formed by appropriately placing reinforcement bars and concrete C around the steel-framed pillars 10 from the lower side (lower layer) in parallel with the above process.

In the embodiment, the joining of the precast concrete slab 12 can be carried out by bolting the steel column 10 with the bolts 14, so that the joining work of the precast concrete slab 12 to the steel column 10 can be performed extremely quickly. , The construction period can be greatly shortened.

Moreover, according to this precast concrete plate 12,
The outer surface has the appearance of smooth and beautiful concrete that has been frame-molded in the factory, so it can give the user a high-quality framed space, and there is no danger of pollution such as fireproof coating. Does not happen.

Further, the precast concrete slab 12 constitutes a fall prevention waist wall by the wall portion 12c, and is integrated with the steel column 10 via joint fittings (inserts in the illustrated example) K at both ends, The conventional brace material can be omitted because it constitutes a seismic element that resists horizontal forces such as earthquakes and winds.

By the way, in the precast concrete slab 12 in the above-mentioned embodiment, the joint 16 connected to the steel column 10 is constituted by the inserts 16 embedded in both joint end faces thereof, but as shown in FIG. Edition
On both joint end faces of 12, a joint plate 40 with a bolt hole extending in the longitudinal direction of the end face is projected, and the joint plate 40 is bolted in a state of being wrapped with a gusset plate 41 provided on the steel column 10. It may be configured.

Of course, a part of the joint plate 40 is embedded in concrete, and an anchor bar or the like is welded to the embedded portion.

Also, in the illustrated example, this precast concrete slab 12
A PC steel material 45 extending in the longitudinal direction is embedded in the upper and lower portions of the PC steel material, and prestress is introduced by these PC steel materials 45.

The introduction of the tensile force to the PC steel material 45 is made by the post-tension method, and the tensioning work and the fixing means accompanying the introduction of prestress are the common means adopted when producing a conventional prestressed concrete member. Done.

Then, even in the frame structure using the precast concrete slab 12 having such a configuration, after the precast concrete slab 12 is installed at a predetermined position between the pillars, as in the previous embodiment, the joints of the joint end faces are formed. Steel column 10 using metal fittings K
Can be easily connected to.

Further, since the beam 11 can also be easily connected via the connecting arm 12a of the main body portion 12b, it is possible to achieve substantially the same operational effect as the above-mentioned embodiment, the precast concrete slab introduced with prestress. 12 makes it possible to improve the strength of the concrete slab itself and to make it thinner.

Further, in this embodiment, since the joint plate 40 is bolted to the gusset plate 41 of the steel frame column 10 by the bolts 14, the gap l between the steel frame column 10 and the joint end face of the precast concrete slab 12 is set. Can be taken, and the bar arrangement around the steel column becomes easy. Incidentally, the joint portion,
Needless to say, it is covered with concrete cast around the steel column 10.

Needless to say, the introduction of prestress to the precast concrete slab is not limited to the example shown in FIG. 5, but is also applicable to the example shown in FIG.

FIG. 6 shows still another embodiment of the present invention, in which the main body portion 12a of the precast concrete slab 12 projecting to the lower side of the slab is made as small as possible to enhance the smoke exhausting effect. .

As described above, in this invention, the beam 11 is supported by the precast concrete slab 12 forming the waist wall instead of the beam, and the size of the portion protruding below the slab can be made relatively small. Therefore, it is possible to effectively deal with smoke exhaust.

[Effect of the Invention] As described above, this invention is a multi-story parking lot in which one end of a beam that constitutes the floor of each layer of a multi-story parking lot is supported by a precast concrete slab installed between steel columns. In the frame structure, the precast concrete slab is composed of a main body portion provided with a connecting arm for connecting one end of the beam to the inner surface, and a fall prevention wall portion integrally formed on the upper side of the main body portion. And, since both joint end surfaces of the precast concrete slab are provided with joint fittings that are bolted to the steel column, the following excellent effects are exhibited. .

The precast concrete slab for fall prevention is integrated with the steel columns through the joint fittings at both ends and resists horizontal force such as earthquake and wind, so the precast concrete slab itself can act as a seismic element for the parking lot. . Therefore, the brace of the outer wall portion of the parking lot can be omitted, and the structure can be simplified.

The precast concrete plate itself is a refractory structure,
Moreover, since the entire mold is molded, the aesthetic appearance is not lost. That is, since the outer surface of the precast concrete slab has the appearance of smooth and beautiful concrete that has been molded in a factory, it is possible to give the user a high-class frame space and to use it like a fireproof coating. No danger of pollution arises.

In addition, when constructing the frame, as with the steel frame assembly method,
After installing the precast concrete slab at a predetermined position between columns, it can be easily connected to the steel column using the joint fittings on the joint surface, and the beam can also be easily connected via the connecting arm of the main body As a result, it is possible to achieve the joining of the concrete beam and the steel column like the conventional steel beam, and to improve the workability.

In addition, if the structure is constructed by embedding a PC steel material inside the precast concrete slab and introducing prestress,
Since the strength of the precast concrete slab itself can be increased and the plate thickness of the precast concrete slab can be reduced, it is possible to improve the applicability of the precast concrete slab as a seismic element that also serves as the waist wall of a multi-storey parking lot.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view of an outer wall portion shown for explaining the frame structure of a multistory parking lot, and FIG. 2 is a precast concrete slab. The front view showing the state of being attached between the steel columns, the third
Figures and 4 are shown to explain the construction procedure of the slab. Fig. 3 is a perspective view, Fig. 4 is a sectional view, and Fig. 5 is a precast concrete slab showing another embodiment of the present invention. FIG. 6 is a sectional view showing still another embodiment of the present invention, and FIG. 7 is a perspective view showing an example of a frame structure of a conventional multilevel parking lot. 10 …… Steel pillar, 10a …… Connecting arm, 10b …… Flange part, 11 …… Beam, 12 …… Precast concrete plate, 12a …… Connecting arm, 12b …… Main body part, 12c …… Wall part, 12d …… Step, K …… Coupling metal fitting, 13 …… Bolt insertion hole, 14 …… Bolt, 15 …… Coupling plate, 16 …… Insert, 20 …… Deck plate, 20a …… Rib, 30 …… Main muscle , 31 …… Structure, C …… Concrete, S …… Slab, 40 …… Coupling plate, 41 …… Gazette plate, 45 …… PC steel, F ₁ , F ₂ …… Parking floor, R …… Inclination Roadway, W ... waist wall.

Claims (2)

[Scope of utility model registration request] 1. A frame structure of a multi-storey parking lot, wherein one end of a beam that constitutes a floor of each layer of the multi-storey parking lot is supported by a precast concrete slab installed between steel columns. The concrete slab is composed of a main body portion having a connecting arm for connecting one end of the beam to the inner surface, and a wall for fall prevention integrally formed on the upper side of the main body portion, and both of the precast concrete slabs. A frame structure of a multi-storey parking lot, in which a joint fitting that is bolted to a steel column is provided on the joint end surface. 2. The frame structure of a multi-storey parking lot according to claim 1, wherein a PC steel material is embedded in the precast concrete slab to introduce prestress.