JP3205653B2 - Precast floor slab for semi-underground parking and its mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast slab for use in a semi-underground parking lot having a sloping floor and a mounting structure thereof.

[0002]

2. Description of the Related Art Conventionally, when constructing such a semi-underground parking lot, the floor of the parking lot is formed to be inclined in order to minimize the parking space.

When constructing a parking lot having such a sloping floor, first, a parking lot construction area on the ground is excavated to form a root cutting portion, and a foundation is built around the inside of the root cutting portion.

[0004] Next, the inside of the root cutting portion is backfilled in accordance with the inclination of the floor of the parking lot, and concrete is poured along the inclined surface to form an inclined floor.

[0005]

In the construction of the above-mentioned conventional semi-underground parking lot, in order to form a floor surface in an inclined state, after excavating and forming a root cutting portion, the inside of the root cutting portion is further excavated. Backfilling has to be performed, and the labor required for the backfilling is enormous, requiring a long time, a long construction period, and high costs.

In addition, concrete must be cast in place and cured after it is backfilled, so that it is necessary to keep out of the area during the period required for curing, which makes it difficult to work. There was also.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to form an inclined floor surface without backfilling in a root cut.
Further, it is an object of the present invention to provide a precast floor slab of a semi-underground parking garage capable of performing work without considering a curing period and a mounting structure thereof.

[0008]

In order to achieve the above object, a first aspect of the present invention is to provide a ground excavation section in which a parking lot forming area of the ground is excavated, one end of which is located at a ground surface position and the other end of which is a ground excavation section. A substantially square precast concrete floor slab body disposed at the bottom and arranged in an inclined state, an upper fixing anchor bolt insertion hole formed at the one end side of the floor slab body, and The present invention is characterized in that it has a concrete pouring hole for fixing the lower portion formed on the other end side of the plate main body, and a connecting hole for supporting and fixing an intermediate portion formed in an intermediate portion of the floor slab main body.

In a second aspect of the present invention, a precast concrete foundation is erected around the inside of a root excavated portion where a parking lot forming area of the ground is excavated, and an intermediate support bundle foundation is erected at an intermediate part. A lower end receiving plate is arranged at the bottom of the root cutting portion at a position opposite to the entrance side, and the other end of the precast concrete floor slab body is placed on the lower end receiving plate,
The one end of the floor slab body is placed and supported on the upper end of the entrance-side foundation, and an anchor bolt protruding from the entrance upper end of the foundation is inserted into the anchor bolt insertion hole of the floor slab body and connected to connect the lower slab. Concrete is injected into each of the concrete injection holes and the connection holes for fixing the intermediate portion, and the floor slab main body, the bundle foundation and the lower end receiving plate are fixed.

According to a third aspect of the present invention, the lower receiving plate includes a plate-shaped receiving plate main body, and a concrete stopper portion projecting vertically from both longitudinal sides of the receiving plate main body. The main body is characterized in that a communication hole is formed in the main body so that the space above and below the main body of the receiving plate communicates with each other and the concrete goes around the main body of the main plate.

[0011]

According to the first and second aspects of the present invention, a foundation is formed around a root cut portion formed by excavating a parking lot forming area of the ground, and one end of a precast concrete floor slab body is formed. Is disposed in an inclined state with the upper end position of the entrance side on the entrance side and the other end positioned at the bottom of the root cutout, and an anchor bolt projecting from the upper end of the foundation on the entrance side is formed on the one end side of the floor slab main body. And inserted into the anchor bolt insertion hole.

In this case, it is not necessary to backfill the inside of the root cutting portion in an inclined manner, and only the floor slab main body needs to be installed.
The labor required for backfilling can be omitted, and the construction period can be shortened and the cost can be reduced. Further, it is not necessary to cast a wide range of concrete on site, and therefore, the troublesome work during the curing period is also eliminated.

Further, concrete is injected from a concrete injection hole for fixing the lower portion and a connection hole for fixing and fixing the intermediate portion, and the floor slab main body, the bundle foundation and the lower end receiving plate are fixed, so that a more secure mounting is achieved. Becomes possible.

According to the third aspect of the invention, the concrete stoppers are continuously projected vertically from both longitudinal sides of the receiving plate main body constituting the lower end receiving plate, and upper and lower communication holes are formed in the receiving plate main body. As a result, the concrete injected from the concrete injection hole at the bottom end of the floor slab can be securely wrapped around the top and bottom of the slab main body, and the injected concrete can be securely held at the connection part to strengthen the connection state Becomes

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a view showing a precast floor slab of a semi-underground parking lot according to an embodiment of the present invention.

The precast floor slab 10 is a floor slab main body 1.
2, an anchor bolt insertion hole 14, a concrete injection hole 16, and a connection hole 18.

The floor slab main body 12 is made of precast concrete having a substantially square shape. One end 20 is located at the ground surface position and the other end 2 is located in a root cut portion formed by excavating a parking lot forming area of the ground.
The two sides are arranged in an inclined state with the bottom located at the bottom of the root cutting portion, and constitute an inclined floor surface of the parking lot.

Further, the floor slab main body 12 is
Reinforcing bars and the like are provided inside to prevent the vehicle from being broken even if the vehicle is mounted on the vehicle so as to have sufficient strength.

Further, the surface of the floor slab main body 12 is in a state of being subjected to a finishing treatment in advance, so that it is not necessary to perform the finishing treatment after disposing it in the root cutting portion.

Further, although not shown, a collar or the like for preventing slip is formed on the upper surface of the floor slab body 12 in advance. Since the floor slab body 12 is made of precast concrete, the collar and the like can be formed easily and at low cost.

The anchor bolt insertion hole 14 is provided in the floor slab main body 1.
A pair of left and right sides is formed on one end 20 side of the base 2 to fix the upper portion of the floor slab main body 12 in an inclined state, and can be connected by inserting an anchor bolt on the foundation side. A rectangular tapered recess 24 is formed around the surface of the anchor bolt insertion hole 14, as shown in FIG.
By embedding 4 with concrete or the like, the tip of the anchor bolt can be covered.

The concrete injection hole 16 is provided in the floor slab main body 12.
Left and right are formed on the other end 22 side, and fix the lower part of the slab body 12 in an inclined state. By injecting and solidifying concrete from above, the concrete can be fixed to the bottom of the root cutting part. I have. Also, this concrete injection hole 1
6, from the front side to the back side, as shown in FIG.
It is formed so as to expand, so that the concrete for fixing can be easily poured.

The connection hole 18 is provided at one end 20 of the floor slab main body 12.
A pair of right and left is formed at an intermediate portion between the first and second ends, and is fixed to an intermediate portion support member such as a bundle foundation by injecting concrete for fixing from the surface side. Also, as shown in FIG. 7, the connection hole 18 is expanded from the front side to the back side so that the concrete for fixing can be easily injected.

Next, a mounting structure of the precast floor slab 10 according to the embodiment will be described with reference to FIGS.

First, FIG. 2 shows a building 32 having a semi-underground parking lot 30.
First, as shown in FIG. 3, as shown in FIG. 3, a parking lot forming area of the ground 34 is excavated to form a root cut portion 36, and a precast concrete foundation is formed around the inside of the root cut portion 36. 38 and 40 are erected. In this case, on the entrance 42 side of the parking lot 30, a base 38 having a low height corresponding to from the bottom 44 of the root cutting portion 36 to substantially the ground surface 46 is used, and the other portions are higher than the base 38. The high foundation 40 is used. In addition, foundations 38 and 4
The portion outside 0 is backfilled.

In the root cutting portion 36 surrounded by the foundations 38 and 40, an intermediate supporting bundle foundation 48 is erected at an intermediate portion at a position corresponding to the connection hole 18 formed in the floor slab main body 12. At the same time, a lower end receiving plate 50 is disposed at the bottom 44 of the root cutting portion 36 at a position opposite to the entrance 42 side. The lower end receiving plate 50 is made of precast concrete, and includes a flat plate receiving plate main body 52 and a concrete stopper 54 projecting vertically from both longitudinal sides of the receiving plate main body 52. The concrete stopper 54 forms a space for storing concrete in the lower part and the upper part of the receiving plate main body 52. A communication hole 56 is formed in the receiving plate main body 52 so that the upper and lower spaces of the receiving plate main body 52 are communicated with each other so that the concrete wraps around the upper and lower spaces of the receiving plate main body 52.

Then, the other end 22 of the precast concrete floor slab main body 12 is placed on the lower end receiving plate 50, and one end 20 of the floor slab main body 12 is placed and supported on the upper end of the foundation 38 on the side of the doorway 42 so that the doorway is opened. The anchor bolts 58 are supported in a downwardly inclined state from the 42 side to the back side, and project from the upper end of the foundation 38 on the entrance 42 side through the anchor bolt insertion holes 14 of the floor slab main body 12, and are connected by tightening with the nut 59. (See FIGS. 3 and 4). Further, the anchor bolt insertion hole 14 of the floor slab main body 12 is provided.
As shown in FIG. 4, concrete 60 is poured into the recess 24 formed on the periphery to cover the anchor bolt 58.

Further, as shown in FIGS. 5 and 7,
Concrete 62 and 64 are poured from the concrete injection hole 16 for fixing the lower part and the connection hole 18 for fixing the middle part, respectively, and the floor slab main body 12, the bundle foundation 48 and the lower end receiving plate 50 are provided.
And fix. In this case, since the concrete injection hole 16 and the connection hole 18 are designed to expand toward the back surface, the concrete injection hole 16 and the connection hole 18 are reliably injected into the lower end receiving plate 50 and the bundle base 48 side to be in a solidified connection state. Also, the lower plate 50
The concrete holes 62 formed in the receiving plate main body 52 are surely wrapped up and down of the receiving plate main body 52, and the concrete 62 is held by the concrete stopper 54, so that a reliable connection state is obtained. Become. As shown in FIG. 7B, a notch 66 is formed on the upper surface of the bundle foundation 48 at a position corresponding to the connection hole 18 of the floor slab main body 12, and the inside of the notch 66 is filled with concrete 64. By filling, a share cotter is configured. Although not shown, if a notch for ventilation is formed at the upper end of the foundation 38 on the side of the entrance 42, concrete 60 is injected into the notch for ventilation to form a shear cotter. It is also possible.

As described above, the floor surface in an inclined state can be formed without backfilling the inside of the root cutting portion 36, and labor for backfilling can be omitted, thereby shortening the construction period and reducing the cost. Can do it. In addition, the use of the precast floor slab 10 eliminates the need for a finishing process on the floor surface and eliminates the need for a curing period as in the case of cast-in-place concrete, so that the troublesome work can be eliminated.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

For example, although a bundle base is shown as an intermediate support member of the precast floor slab 10, the present invention is not limited to this example, and a precast cloth base or the like may be used.

[0033]

As described above, in the first and second aspects of the present invention, one end of the precast concrete floor slab is positioned at the upper end of the foundation on the entrance side, and the other end is positioned at the bottom of the root cutting portion. Arranged in the inclined state, and anchor bolts protruding from the upper end of the entrance-side entrance are inserted into anchor bolt insertion holes formed on the one end side of the floor slab main body and connected to each other, so that the inside of the root cut portion is formed. It is possible to form a sloping floor of a semi-underground parking lot without backfilling in a sloping manner, eliminating the labor required for backfilling in the root cut, shortening the construction period and reducing costs. There is an effect that reduction can be achieved.

In addition, there is no need to cast a wide range of concrete on site, and therefore, it is possible to eliminate the troublesome work during the curing period.

Further, concrete is injected through the concrete injection hole for fixing the lower portion and the connection hole for fixing the intermediate portion, and the floor slab is fixed to the bundle base and the lower end receiving plate, thereby assuring a more secure mounting. There is an effect that can be.

According to the third aspect of the present invention, the concrete stoppers are continuously projected vertically from both longitudinal sides of the receiving plate body constituting the lower end receiving plate, and upper and lower communication holes are formed in the receiving plate body. Thereby, the concrete injected from the concrete injection hole at the lower end side of the floor slab main body can be surely wrapped around the top and bottom of the slab main body, and the injected concrete can be securely held at the connection portion to strengthen the connection state. This has the effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a precast floor slab of a semi-underground parking lot according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a building having a semi-underground parking lot constructed using the precast floor slab of FIG. 1;

FIG. 3 is an enlarged sectional view of a main part of the semi-underground parking lot of FIG. 2;

FIG. 4 is an enlarged sectional view showing a connected state of an upper end portion of the precast floor slab of FIG. 3;

FIG. 5 is an enlarged sectional view showing a connected state of a lower end portion of the precast floor slab of FIG. 3;

FIG. 6 is an enlarged perspective view of the lower end receiving plate of FIG. 5;

7A is an enlarged cross-sectional view showing a connected state of the intermediate portion of the precast floor slab of FIG. 3, and FIG. 7B is a cross-sectional view as viewed from the arrow B direction of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Precast floor slab 12 Floor slab main body 14 Anchor bolt insertion hole 16 Concrete injection hole 18 Connection hole 20 One end 22 Other end 30 Semi-underground parking lot 34 Ground 36 Root cut 38, 40 Foundation 42 Doorway 44 Bottom 46 Ground surface 48 Bundle Foundation 50 Lower end receiving plate 52 Receiving plate main body 54 Concrete stopper 56 Communication hole 58 Anchor bolt

Claims (3)

(57) [Claims] 1. A substantially rectangular shape which is disposed in an inclined state with one end located at the ground surface position and the other end located at the bottom of the root cutting portion in a root cutting portion obtained by excavating a parking lot forming area of the ground. A precast concrete floor slab body, an upper fixing anchor bolt insertion hole formed at the one end side of the floor slab body, and a lower fixing concrete injection formed at the other end side of the floor slab body. A precast floor slab for a semi-underground parking lot, comprising: a hole; and a connection hole for supporting and fixing an intermediate portion formed in an intermediate portion of the floor slab main body. 2. A base made of precast concrete is erected around the inside of a root cut portion excavated in a parking lot forming area of the ground, and a bundle base for intermediate support is erected at an intermediate portion, and is opposite to an entrance / exit side. A lower end receiving plate is disposed at the bottom of the root cutting portion at the side position, the other end of the precast concrete floor slab body is placed on the lower end receiving plate, and the one end of the floor slab main body is placed on the entrance side. An anchor bolt protruding from the upper end of the foundation on the entrance side is inserted and connected to the anchor bolt insertion hole of the floor slab body and connected to the concrete injection hole for lower part fixing and the intermediate part fixing part. The structure for mounting a precast floor slab in a semi-underground parking lot according to claim 1, wherein concrete is poured into the connection holes, and the floor slab body, the bundle foundation and the lower end receiving slab are fixed. 3. The receiving plate according to claim 2, wherein the lower receiving plate has a plate-shaped receiving plate main body, and a concrete stopper portion continuously projecting vertically from both longitudinal sides of the receiving plate main body. The plate body is provided with a communication hole that connects the space above and below the receiving plate body and allows the concrete to go around the top and bottom of the printing plate body. .