JP2842146B2 - Underground foundation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground base structure constructed underground to support a building, and more particularly to an underground base structure suitable for use in a high-rise or super-high-rise building.

[0002]

2. Description of the Related Art Conventionally, cast-in-place concrete piles have been widely used in foundation structures constructed underground to support buildings. This cast-in-place concrete pile
It is formed by drilling a hole from the ground surface to a hard base deep underground and driving concrete into it.
In such a construction method using cast-in-place concrete piles,
In order to sufficiently secure the strength of the foundation structure for the building, for example, one pile is formed to support one pillar. When constructing the foundation structure in this way, the span of the building is short despite the fact that the building is high-rise and the foundation structure to which high axial force is applied needs sufficient strength. In some cases, it was not possible to secure a sufficient space between piles needed for pile formation.

In the case of the cast-in-place concrete pile, if the ground is soft or liquefied, it is difficult to design the pile against horizontal force.

In recent years, instead of cast-in-place concrete piles, foundations have been constructed using underground continuous walls.

FIG. 6 shows a plan view and a longitudinal sectional view of a conventional underground foundation structure using an underground continuous wall. Explaining the construction of the foundation structure, a groove continuously surrounding the four circumferences of the building construction site is excavated to a predetermined depth in the ground 6, and an underground continuous wall 2 made of reinforced concrete or the like is built in the groove. I do. Next, the underground continuous wall 2 is used to provide a required space for constructing the foundation beam 4 and the like while using the underground continuous wall 2 as a soil retaining wall or a water blocking wall.
Root cutting in the area surrounded by. Since the underground continuous wall 2 is relatively thin in consideration of economy and the like,
The underground continuous wall 2 is supported from the inside by a cutting beam or the like, and the foundation beams 4 are constructed in a lattice shape in the space in the underground continuous wall 2 thus formed. The underground continuous wall 2 and the foundation beam 4 complete the foundation structure.

[0006]

In the above-described foundation structure, in order to secure sufficient strength as the foundation structure in view of utilizing the underground continuous wall 2 having a relatively thin wall thickness,
Underground wall 2 continuously surrounding the four circumferences of the building construction site
On the other hand, a large number of foundation beams 4 are constructed inside this.

First, the underground continuous wall 2 has a problem that the construction cost is extremely high. In particular, when the building itself is a high-rise building, but the underground is only the basement structure or is about one floor below ground and the depth of the bottom is shallow, the underground continuous wall 2 constructed deep underground is used. Adopting an excessive structure that exceeds the necessity in view of the construction depth of the root-cutting bottom has been a problem that it is unsatisfactory even in view of cost.

Second, as described above, the underground continuous wall 2
The necessity of constructing a large number of foundation beams 4 in response to the adoption of the method requires a large amount of materials, prolongs the construction period, and consequently increases the construction cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the construction area of an underground continuous wall and to reduce the material as compared with the conventional one while ensuring structural strength comparable to the conventional one. An object of the present invention is to provide an underground foundation structure suitable for a short span high-rise building or the like which can be constructed in a large quantity.

[0010]

In order to achieve the above object, an underground substructure according to the present invention is a substructure constructed underground to support a building, wherein each of the corners of the building is Piles, which are constructed in a closed section with a continuous underground wall, and a plurality of piles
It is characterized by being composed of a foundation beam constructed and connecting these .

[0011] In addition, the foundation beam steel skeleton concrete structure or
Or made of steel-framed reinforced concrete .

Further, the pile body is disposed between corners of the building, and is connected to the foundation beam.

[0013]

According to the operation of the present invention, a foundation structure for supporting a building is provided at each corner of the building, and a pile body constructed in a closed section hollow by an underground continuous wall;
Multiple piles are constructed between these piles and connected
By constructing the building from the foundation beams to be connected, the construction location of the underground continuous wall is Each corner has only a portion constituting a hollow pile body having a closed cross section, and the construction area can be reduced.
The construction cost can be reduced by reducing the construction area of the underground continuous wall having a high construction cost. Also,
Since the underground continuous wall having the above configuration constitutes a closed pile hollow pile body, even if the underground continuous wall itself has a relatively thin wall thickness, it is a considerable pile body constituting the foundation. It exhibits strength and can secure structural strength comparable to the conventional one. Only
However, there is a foundation beam connecting these piles
Since they are constructed, each pile is structurally connected to each other.
The structural strength is improved. In particular, multiple bases between piles
Desirable structural strength of underground foundation structure by building foundation beams
The underground foundation structure can be set reasonable and economic
Can be constructed

On the other hand, since the foundation structure has such a high-strength pile, the number of foundation beams to be constructed can be reduced. As a result, it is possible to construct with a smaller amount of materials than in the past, and in this respect, it is possible to reduce the construction cost.

[0015] If a foundation beam made of steel-frame concrete or steel-frame reinforced concrete is used, a sufficient strength can be secured against the bending moment acting on the foundation beam.

Further, the structure of the building is one-way short span,
In the case of a long span in other directions, a similar pile body is constructed not only at the corners but also between these corners, and this is connected to the foundation beam to make it correspond to the building structure. The present invention can be applied in a different form.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a preferred embodiment of the underground foundation structure according to the present invention. The present embodiment is basically arranged in each corner of a building in a substructure constructed underground to support the building, and has an underground continuous wall 1
The pile 10 includes a pile 10 constructed in a hollow closed section by Oa, and a foundation beam 12 constructed between the piles 10 and connecting them.

In this figure, this underground foundation structure 8 is applied as a foundation of a high-rise building having a basement floor of about one basement floor or a shallow root without a basement floor, and is mainly composed of a pile 10 and a foundation beam 12. It is configured. The piles 10 are arranged corresponding to the respective corners of the building. If the planar outline of the building is a quadrangle, it is placed at four corners if it is a quadrangle, and three or five if it is a triangle or a pentagon. And so on, corresponding to each corner. Then, between the pair of piles 10 adjacent to each other along the outer contour of the building, the foundation beam 12 is constructed at the root cutting bottom position. Therefore, the foundation beams 12 are arranged in series along the outer contour of the building in the circumferential direction. In the present embodiment, the foundation beams 12 are provided in parallel between the piles 10.

In the present embodiment, the pile body 10 has four underground continuous walls 10a each having a width of several meters and a thickness of about 1 meter.
By combining them, it is formed in the shape of a quadrangular prism with a hollow closed section that is long in the depth direction. The pile body 10 may also be formed in a circular cross section, a triangular cross section, or another polygonal cross section as necessary. The underground continuous wall 10a is constructed of reinforced concrete or steel-framed reinforced concrete, and uses a stabilizing liquid mainly composed of polymer or benite, and has a predetermined depth in the ground using an excavator while preventing collapse of the ground. Excavate a continuous groove, then insert a reinforcing bar or steel frame into this groove and pour concrete into it, or use a reinforced concrete plate that has already been manufactured in a factory etc. It is constructed by inserting it into a groove, and functions as a retaining wall, water blocking wall, or underground outer wall.

The details of the foundation beam 12 are shown in FIGS. In this embodiment, the foundation beam 12
Is constructed of steel and reinforced concrete. By disposing the steel frame material, sufficient strength against the bending moment can be imparted to the foundation beam 12. The concrete structure will be described in detail. A channel member 20 having a U-shaped cross section and a plate-like inclined member 22 are used as steel members. A pair of the channel members 20 are provided on each of the upper end side and the lower end side of the foundation beam 12 along the longitudinal direction. The pair of channel members 20 provided on each of the upper end side and the lower end side of the foundation beam 12 are disposed in parallel at a distance from each other in the width direction of the foundation beam 12, and the groove opening thereof is formed in the foundation beam. By being directed to the outside of the groove 12, the groove bottom surface opposite to the groove opening is positioned so as to face each other with an interval. Further, between these channel members 20, diagonal members 22 are sandwiched therebetween, and are disposed obliquely in the height direction of the foundation beam 12. These diagonal members 22 are arranged so as to be folded at the positions of the channel members 20 on the upper end side and the lower end side, are arranged in a zigzag shape along the longitudinal direction of the foundation beam 12, and are formed by welding or the like. It can be attached to. Around the steel structure thus configured, beam main reinforcing bars 16 are disposed at the corners of the foundation beam 12 along the longitudinal direction of the foundation beam 12, and the beam main reinforcing bar 16 is connected to the beam section. Stirrup streaks 18 surrounding the base beam 12
Are arranged at intervals in the longitudinal direction. And by placing concrete 24 on the structure,
The foundation beam 12 is constructed.

FIG. 2 is an enlarged perspective view of a portion A of FIG. 1 showing a corner portion of the underground foundation structure 8, that is, a top surface portion of the pile body 10. In the present embodiment, the top surface of the pile body 10 has a square shape that matches the closed cross-sectional shape formed by the underground continuous wall 10a, and the pillars 14 at the corners of the building are each side of this square shape. Respectively. Since the pile body 10 has considerable strength, it can be used not only as a pile but also its hollow interior as required, and can be used, for example, as a three-dimensional underground parking lot.

As is apparent from the above configuration, according to the present embodiment, the foundation structure for supporting the building is disposed at each corner of the building, and has a hollow hollow section by the underground continuous wall 10a. And a foundation beam 12 constructed between the piles 10 and connecting the piles 10 so as to continuously surround four circumferences of the building construction point as in the related art. In comparison with the case where the underground continuous wall 10a is constructed, only the portion constituting the hollow pile 10 having a closed cross section at each corner of the building is reduced, and the construction area is reduced. Becomes possible. And since construction area of the underground continuous wall 10a with high construction cost can be reduced, construction cost can be reduced. Further, since the underground continuous wall 10a having the above-described configuration constitutes the pile body 10 having a hollow closed cross section, even if the underground continuous wall 10a itself has a relatively thin wall thickness, the pile constituting the foundation is not required. The body 10 exhibits considerable strength, and can secure structural strength comparable to that of the related art.

On the other hand, there is a problem with the conventional cast-in-place concrete pile, that is, it is necessary to construct a large number of piles as the foundation of a building, and particularly in the case of a building having a short span, the pile interval cannot be appropriately set. However, since the pile body 10 of this embodiment has a larger and higher-strength structure as compared with the conventional cast-in-place concrete pile, it is sufficient to construct it at each corner of the building, and therefore, a short span building is required. Objects, especially high-rise buildings where high axial forces are applied to the foundation,
A foundation structure of sufficient strength can be constructed. Also,
It can sufficiently resist horizontal force.

Since the foundation structure is provided with the high-strength pile 10 as described above, the number of foundation beams 12 to be constructed can be reduced. As a result, a foundation can be constructed with a smaller amount of materials than in the past, and the construction cost can be reduced in this respect as well.

Further, a foundation beam 1 made of a steel-framed reinforced concrete structure
Since 2 is used, sufficient strength can be secured against the bending moment acting on the foundation beam 12.

Further, the structure of the building is one-way short span,
In the case of a long span in other directions, a similar pile body is constructed not only at the corners but also between these corners, and this is connected to the foundation beam to make it correspond to the building structure. The present invention can be applied in a different form.

FIG. 5 shows another embodiment of the present invention. This embodiment considers the case where the structure of the building has a short span S in one direction and a long span T in the other direction. In this embodiment, not only the corners of the building but also these corners are used. A similar pile 10 is separately constructed in between, and this is
2. With this configuration, the strength of the foundation structure on the long span T side does not become insufficient, and the same operation and effect as in the above embodiment can be secured in a form corresponding to the building structure.

[0028]

According to the present invention, as described in the above embodiments, a foundation structure for supporting a building is disposed at each corner of the building, and has a hollow hollow section with a continuous underground wall. Piles, and a plurality of piles
By constructing from the foundation beams that are constructed and connect these, compared to the case where the surrounding area of the building was continuously surrounded around the building as before, Is only a portion that constitutes a closed pile hollow body at each corner of the building, and the construction area can be reduced. And since construction area of the underground continuous wall with high construction cost can be reduced, construction cost can be reduced. Further, since the underground continuous wall having the above configuration constitutes a closed pile hollow pile body, even if the underground continuous wall itself has a relatively thin wall thickness, as a pile body constituting a foundation, It exhibits considerable strength and can secure structural strength comparable to the conventional one. Moreover, between these piles
Since the foundation beams connecting them are constructed,
The body is structurally connected to each other to increase structural strength
You. In particular, since multiple foundation beams are constructed between piles,
The structural strength of the lower foundation can be set as desired,
The substructure can be constructed reasonably and economically
You.

On the other hand, since the above-mentioned pile body has a larger and higher-strength structure as compared with the conventional cast-in-place concrete pile, it is sufficient to construct it at each corner of the building, and therefore, a short span building is required. In particular, even in a high-rise building in which a high axial force is applied to the foundation, a foundation structure with sufficient strength can be constructed. Further, it can sufficiently resist horizontal force.

[0030] Since the foundation structure is provided with such a high-strength pile, the number of foundation beams to be constructed can be reduced. As a result, a foundation can be constructed with a smaller amount of materials than in the past, and the construction cost can be reduced in this respect as well.

Further, since the base beam of the steel frame concrete structure or the steel frame reinforced concrete structure is used, sufficient strength against the bending moment acting on the base beam can be secured.

Further, the structure of the building is one-way short span,
Considering the case of long span in the other direction, a similar pile was constructed not only at the corners of the building but also between these corners, and this was connected to the foundation beam. So
The strength of the foundation structure on the long span side does not become insufficient, and the structural strength can be secured in a form corresponding to the building structure.

[Brief description of the drawings]

FIG. 1 is a perspective view of a preferred embodiment of an underground foundation structure according to the present invention.

FIG. 2 is an enlarged perspective view of a portion A in FIG.

FIG. 3 is a perspective view showing a foundation beam of one embodiment of the underground foundation structure according to the present invention.

FIG. 4 is a longitudinal sectional view of the foundation beam shown in FIG. 3;

FIG. 5 is a plan view of another embodiment of the underground foundation structure according to the present invention.

FIG. 6 is a plan view and a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 8 underground foundation structure 10 pile body 10a underground continuous wall 12 foundation beam

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 29/00 E02D 27/32 E02D 27/34

Claims (3)

(57) [Claims] Claims: 1. A foundation structure constructed underground to support a building, a pile body disposed at each corner of the building, and constructed in a closed section hollow by an underground continuous wall;
Multiple piles are constructed between these piles and connected
An underground foundation structure characterized by connecting foundation beams . 2. The method according to claim 1, wherein the foundation beam is made of steel concrete or
The underground foundation structure according to claim 1, wherein the underground foundation structure is made of steel-framed reinforced concrete . 3. The underground foundation structure according to claim 1, wherein the pile body is arranged between corners of the building and connected to the foundation beam.