JP2001164582A - Foundation construction for ultra-high tower and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation construction or the like for an ultra-high tower (for example, higher than 300 m) with a towering ratio of more than 5 capable of suppressing the site area to a small value. SOLUTION: In a surrounding portion of a lower portion of an ultra-high tower 30 on the ground 10, an outer peripheral diaphragm wall pile 21 with a closed cross section penetrating a supporting ground layer 11 is constructed, and at the inner side of this wall pile 21, an inner continuous underground wall pile 22 with a closed cross section penetrating the bearing ground layer 11 by lowering the upper end from the ground surface at least by the thickness of the mat slab or a number of inner cast-in- place concrete piles are constructed and a mat slab 25 of reinforced concrete is constructed in one united body with these at the upper side of the concrete pile or the wall pile 22 at the inner side of the upper portion of the concrete pile or at the inner side of the upper portion of the concrete pile, and an ultra-high tower having the towering ratio of 5 or larger is constructed by coupling its bottom portion to the foundation 21, 25, therefore, the vertical rigidity and rotation rigidity of the foundation can be improved, and the safety of the ultra-high tower against a long-term large load, overturning against wind, and against overturning during earthquake can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure of an ultra-high tower and a construction method thereof.

[0002]

2. Description of the Related Art The basic structure of a conventional tower tower or cylindrical tower structure includes, for example, the following structures (1) to (3). (1) As shown in FIG. 5, the ground 1 is composed of a support formation 1a and a formation 1b above the support formation 1a.
The diameter of the upper surface of the upper structure 3A is slightly larger than the diameter of the lower end of the upper structure 3A.
Is constructed in a reinforced concrete structure, a substantially cone-shaped or substantially pyramid-shaped steel-framed tower 3A is constructed directly on the foundation 2A, and the lower end of the tower-shaped tower 3A is directly fixed to the foundation 2A. Foundation structure to do. (2) As shown in FIG. 6, the ground 1 is composed of a support formation 1a and a formation 1b above the support formation 1a.
A direct or circular or polygonal direct foundation 2B having a diameter in a plan view approximately twice the diameter of the lower end of the upper structure 3B is constructed on a reinforced concrete structure, and a substantially conical weight is placed on the direct foundation 2B. A foundation structure in which a tower-shaped tower 3B made of a reinforced concrete structure having a square or substantially pyramidal shape is constructed, and the lower end of the tower-shaped tower 3B is directly fixed to the foundation 2B.

(3) In a substructure constructed underground to support a cylindrical tower structure vertically erected on the ground, outside a region of the ground where the cylindrical tower structure is erected. To form a hollow cylindrical pile having a closed section composed of a continuous underground wall in the vertical direction so as to surround the cylindrical tower sufficiently away from a lower portion of the cylindrical tower, A footing is constructed at the upper end of the pile, and if necessary, the footing is supported by a large number of inner piles constructed in the ground inside the pile body, and a cylindrical tower-like structure is constructed on the footing. Then, a base structure in which the lower end of the cylindrical tower-like structure is fixed to the footing (for example, Japanese Patent Laid-Open No. 11-618).
No. 54). The basic structure of a conventional building is, for example,
There is also the following (4). (4) A subsidence reduction pile is buried in the basement foundation of each pillar base of the building, and the ground is excavated to a depth at which the supporting strength of the building can be secured with respect to the basement foundation around the subsidence reduction pile. Improve the ground by stirring and mixing the current position soil and cement-based solidifying material at the current position by a mixing processor, and build a direct foundation of a building including the column base on the settlement-reducing pile and the improved ground, The foundation structure of a building in which a building is constructed directly on the foundation (for example,
-3161941).

[0004]

With the rapid movement toward digitization of broadcasting and communication, plans for digital antenna towers (radio towers) have emerged in various places. It is preferable that the antenna tower be as high as possible from the viewpoint of functions such as widening the terrestrial reception area and attractiveness of the observatory for sightseeing in limited location conditions. (Tower height /
An ultra-high tower tower having a diameter of 5 or more at the bottom of the tower is required. There are 300m class towers, such as the Tokyo Tower and the Eiffel Tower, which are made of steel with good wind permeability, but all have a tower ratio of about 4 to ensure stability due to the shape. Overseas structures with a height of 300 m or more and a tower ratio of 5 or more are often made of reinforced concrete structures that are heavy and have excellent stability instead of lightweight steel structures in order to prevent overturning against wind.
In order to support the heavy weight of the reinforced concrete superstructure and to ensure stability in strong winds, these bases have a large base area. In Japan, both typhoons and earthquakes are in a severe environment compared to overseas, and the compressive and pulling forces at the foundation are very large. It is considered that site conditions are often limited compared to overseas, and the burden on the foundation is further increased. Therefore, the development of a new foundation structure that supports the huge weight of the super-high tower structure and ensures safety against falling has been urgently needed.

[0005] The foundation of the super tower-like structure must support the heavy weight of the superstructure, and must not be overturned by horizontal forces due to earthquakes and winds. The Tokyo Tower and the Eiffel Tower adopt the basic structure of the super-high tower tower described in (1) above. The upper structure is made of steel to reduce the weight, and the wind load is reduced due to the permeability of the steel structure. The load on the foundation is reduced by measures such as reducing the pull-out force due to the overturning moment when the horizontal force acts by adopting a wide range. In this case, in the current situation in Japan, the cost may be increased due to steel frame construction, and there is a drawback that a large site area is required due to an increase in the step width. In addition, in the example of the super-high tower like that seen in the CN tower and the Ostankino tower, the basic structure of the super-high tower like the above (2) is adopted. Take measures to reduce the pull-out force due to the overturning moment when the horizontal force is applied, increase the base area of the foundation, and reduce the pull-out force and the compression force due to the overturning moment when the horizontal force is applied due to the ground pressure due to long-term large load. I have. Even in this case, there is a disadvantage that a large site area is required in order to increase the bottom area of the foundation.

In the basic structure of the cylindrical tower-like structure of the above (3), a footing support for supporting the cylindrical tower-like structure comprises:
Instead of the one constructed with a large number of support piles constructed on the circumference in plan view, the outside of the area of the ground where the tubular tower structure is erected is from the lower part of the tubular tower structure. In order to surround sufficiently away, it is constituted by a hollow cylindrical pile body consisting of an underground continuous wall of a closed cross section constructed toward the vertical direction, aiming to increase the strength against bending moment, In addition to making it easy to design and separating the inner ground and the outer ground with a hollow cylindrical pile, it is possible to prevent liquefaction of the ground, There is a drawback that the diameter of the body-shaped pile is large (approximately twice) as compared with the diameter of the lower part of the cylindrical tower-like structure, and the foot width is not small. The basic structure of the cylindrical tower-shaped structure of the above (3) is such that a thick board-shaped footing is integrally formed on the top end of the hollow cylindrical-shaped pile, so that the hollow cylindrical-shaped pile is formed. The underground continuous wall that constitutes the pile body cannot be used as a retaining wall, and the hollow cylindrical pile body prevents liquefaction. It is not constructed so as to be able to exert resistance to the pull-out force and the compressive force due to the overturning moment when a horizontal force acts on the cylindrical tower-like structure.

[0007] The foundation structure of the building of (4) is that the ground has a sufficient depth to support the building with respect to the foundation under the settlement-reducing pile buried in the foundation under each pillar. Excavation and the ground improvement by mixing and mixing the soil and the cement-based solidified material at the current position with the mixing machine at the current position, and directly setting the foundation including the column base on the settlement-reducing pile and the improved ground The building is built directly on the foundation, and even under the ground conditions that require construction with a pile foundation, it is possible to construct the building directly on the foundation, but the settlement is reduced. The pile does not penetrate its tip into the supporting ground and has a height of 3
It is not applicable to the basic structure of an ultra-high tower tower having a tower ratio of not less than 00 m and a tower ratio of 5 or more. The problem to be solved by the present invention is to provide a foundation structure of an ultra-high tower-like tower which does not have the disadvantages of the above-mentioned prior arts (1) to (4) and a method of constructing the same. In other words, a tower ratio of 5 or more that can keep the site area small (for example,
It is an object of the present invention to provide a foundation structure of a tower tower and a construction method thereof.

[0008]

SUMMARY OF THE INVENTION The basic structure of the tower according to the present invention is a base structure constructed underground for supporting a tower standing above the ground. Perimeter of a closed cross section consisting of a vertical underground continuous wall whose upper end is approximately in line with the ground surface and is buried in the supporting stratum of the ground around the lower part of the tower in the area of the ground where the tower is erected A continuous underground wall pile is constructed, and a vertical underground continuous wall in which the upper end is lowered by at least the thickness of the mat slab below the ground surface and is buried in the supporting stratum of the ground inside the outer peripheral continuous underground wall pile. An internal continuous basement pile or a number of internal cast-in-place concrete piles with a closed cross section consisting of: built above the internal continuous basement wall pile or each internal cast-in-place concrete pile inside the upper part of the peripheral continuous basement pile, Perimeter continuous underground wall pile and internal connection A mat slab is constructed integrally with the underground wall pile or the internal cast-in-place concrete pillar pile, and an ultra-high tower tower having a tower ratio of 5 or more is constructed above the mat slab or above the mat slab and the outer peripheral continuous underground wall pile. The lower part of the tower is connected to the mat slab and the continuous underground wall pile or the mat slab or the continuous continuous underground wall pile.

In the case where the stratum above the supporting stratum of the ground has a certain level of strength and the earth retaining work can be performed relatively easily, the vertical underground continuous wall constituting the outer peripheral continuous underground wall pile is required. ,
It is constructed by lowering its upper end at least by the thickness of the mat slab from the ground surface and nesting it in the supporting stratum of the ground, where the mat slab is located above the area surrounded by the outer peripheral surface of the outer peripheral underground pile. The pile and the internal continuous underground wall pile or the internal cast-in-place columnar concrete pile may be integrally formed. In a preferred form of the present invention, an underground floor is constructed by connecting the mat slab to the upper side of the mat slab, and the lower part of the super tower-like tower is connected to the mat slab via the basement floor, The diameter of the outer peripheral portion of the outer peripheral continuous underground wall pile is substantially the same as or slightly larger than the outer peripheral portion of the lower portion of the ultrahigh tower tower. In the preferred embodiment of the present invention, the lower surface of the mat slab is located on the support layer of the ground, but the lower side of the mat slab is supported by the upper layer of the support layer of the ground. You may do so.

According to the method for constructing the foundation of the tower according to the present invention, a continuous underground wall pile consisting of an underground continuous wall is constructed around the ground on which the tower is to be erected. Inside continuous underground wall piles of closed section consisting of underground continuous walls or a number of internal cast-in-place concrete piles are constructed inside underground wall piles, and inside continuous underground wall piles inside the upper part of outer continuous underground wall piles or each In a construction method of a foundation in which at least a mat slab is constructed on the upper side of an internal cast-in-place concrete pillar, in a peripheral portion of a lower portion of the super-high tower in the area of the ground where the super-high tower is erected, Construct an outer continuous underground wall pile with a closed section consisting of a vertical underground continuous wall that is rooted in the supporting stratum of the ground with the upper end almost in line with the ground surface, and excavate the ground inside the outer peripheral underground wall pile Then at least matx Forming a space of a depth that can construct a slab, and in this space at least the mat slab is constructed of reinforced concrete integrally with the outer peripheral continuous basement wall pile and the internal continuous basement wall pile or the internal cast-in-place columnar concrete pile. It is a feature. The internal continuous basement pile or a number of internal cast-in-place concrete piles are usually
Although it is constructed before the space for constructing the mat slab and the basement is formed, it may be constructed after the space is constructed. The above “ground surface” is the designed ground surface. The super high tower in this invention is a steel frame, a steel frame reinforced concrete structure, or a reinforced concrete structure.

[0011]

According to the basic structure of the tower according to the present invention, the tower has a tower ratio of 5 or more (for example, a height of 300 m or more).
For the tower tower, a direct foundation with at least a mat slab immediately below the tower tower, an outer peripheral continuous basement wall pile immediately below or in the vicinity, an inner continuous basement wall pile directly below or a number of internal cast-in-place concrete piles The composite tower with large bearing capacity constructed by the combined use of the super high tower tower is designed to resist the large weight of the super tower tower and the overturning moment when horizontal force acts, so the safety of the tower tower is secured. Can be. The perimeter continuous underground wall pile is installed around the tower-shaped tower with its lower part embedded in a solid support stratum of the ground in the required amount, and it is mainly used for pulling out force and compressive force due to overturning moment when horizontal force acts. In addition, the internal continuous basement pile or the multiple internal cast-in-place concrete piles can supplement the supporting performance of the mat slab and the peripheral continuous basement pile due to its existence.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment is shown in FIGS. 1 to 4 and is an example in which the basic structure of the present invention is applied to a conical super tower tower. The composite foundation 20 supporting the super tower-like tower 30 includes an outer peripheral continuous basement wall pile 21, an internal continuous basement wall pile 22, or an internal cast-in-place columnar concrete pile 23, a mat slab 25, and a basement floor 26. The ground 10 includes a support stratum 11 and a stratum 12 above the support stratum 11. At a portion along the outer peripheral edge of the lower end portion of the tower 30 of the ground 10 where the super-tower tower 30 is to be constructed, a hollow cylindrical outer peripheral continuous underground wall pile 21 composed of an underground continuous wall is provided at the outer peripheral edge. It is built almost vertically along. Peripheral continuous basement pile 21
The main part is formed by embedding a main part into the supporting stratum 11 of the ground 10 at a predetermined depth, and the upper end thereof is made to substantially coincide with the upper surface 12a (the ground surface) of the stratum 12 above the ground 10. .

When the upper stratum 12 is not very thick, as shown in FIG. 4A, a hollow cylindrical body is formed inside the outer periphery continuous underground wall pile 21 concentrically with the underground wall pile 21. Of the internal continuous underground wall pile 22 is made of reinforced concrete. The main part of the internal continuous basement pile 22 is the ground 1
The support layer 11 has a predetermined depth and is embedded in the support layer 11 at a predetermined depth, and the upper end thereof substantially coincides with the bottom surface 12 b of the upper layer 12 of the ground 10. Alternatively, as shown in FIG. 4 (b), a number of internal cast-in-place columnar concrete piles 23 are constructed inside the outer peripheral continuous basement wall pile 21 at intervals on a circle concentric with the basement wall pile 21. I do. The main part of the internal cast-in-place columnar concrete pile 23 is the support stratum 11 of the ground 10.
It is built with a predetermined depth in the inside, and its upper end is made substantially coincident with the bottom surface 12 b of the stratum 12 above the ground 10. In addition, the lower end of the internal continuous underground wall pile 22 or the internal cast-in-place columnar concrete pile 23 is, in the example shown in FIGS.
It matches with the lower end of the outer peripheral continuous basement wall pile 21 (to the same level).

The earth and sand in the upper stratum 12 above the ground 10 inside the outer peripheral continuous underground wall pile 21 is excavated, and the earth and sand is carried out.
A space 24 for constructing a mat slab 25 and a basement floor 26 is created. Then, the inner part of the reinforcing bar having the outer part embedded in the concrete of the outer peripheral continuous basement wall pile 21 is projected into the space 24, and the inner continuous basement wall pile 22 or the concrete of the internal cast-in-place columnar concrete pile 23 is formed. The upper part of the reinforcing bar in which the lower part is embedded is projected into the space 24, and a reinforcing bar for a mat slab or the like is arranged above the upper surface 11a of the support stratum 11.
4, concrete is cast into the inside, and as shown in FIG. 1, a mat slab 25 is integrally formed with the outer peripheral continuous basement wall pile 21 and the internal continuous basement wall pile 22 or the internal cast-in-place columnar concrete pile 23 by reinforced concrete construction. To construct. In the example shown in FIG. 1, the lower surface of the mat slab 25 coincides with the upper surface 11 a of the support stratum 11, and the upper surface thereof is lower than the ground surface by the amount of the basement floor 26. An underground floor 26 is constructed on the mat slab 25 by using reinforced concrete. This basement floor 26 is mat slab 25 (or mat slab 2
1 and the outer peripheral continuous underground wall pile 21), and in the example shown in FIG. 1, the upper surface thereof substantially coincides with the ground surface, that is, the upper surface 12a of the upper stratum 12. When the basement floor 26 is not constructed on the mat slab 25, the upper surface of the mat slab 25 is
2 may be lowered below the upper surface 12a, or may be substantially coincident with the upper surface 12a of the stratum 12.

[0015] As shown in FIG.
1. On a composite foundation 20 composed of an internal continuous basement wall pile 22 or an internal cast-in-place columnar concrete pile 23, a mat slab 25, and a basement floor 26, a tower height ratio of 5 or more (for example, a height of 300 m or more) ) The tower 30 is constructed of, for example, a reinforced concrete structure or a steel frame structure. The lower end of the super tower tower 30 is firmly connected to the basement floor 26 or the outer peripheral continuous basement wall pile 21 connected to the mat slab 25 or the outer peripheral continuous basement wall pile 21 and the basement floor 26. In the above embodiment, the tower height ratio is 5 or more (for example, 300 m in height).
As described above, the direct foundation with the mat slab 25 immediately below the tower 30 and the mat slab 2
5, a composite foundation having a large bearing strength by using an underground floor 26 above, an outer continuous underground wall pile 21 immediately below or adjacent thereto, and an inner continuous underground wall pile 22 directly below or a number of internal cast-in-place columnar concrete piles 23. Is constructed so as to resist the large weight of the tower 30 and the overturning moment when the horizontal force acts thereon, so that the safety of the ultra-high tower 30 can be ensured.

The mat slab 25 of the embodiment is installed on a firm ground support layer 11, and mainly supports a long-term load directly on the ground. The outer circumference continuous basement pile 21
Is installed in a portion close to the outer periphery of the tower 30 in a necessary amount in the strong support stratum 11 of the ground, and mainly resists the pull-out force and the compressive force due to the overturning moment when the horizontal force acts. The internal continuous underground wall pile 22 or the plurality of internal cast-in-place columnar concrete piles 23 are installed for the purpose of supplementing the support performance of the mat slab 25 and the outer peripheral continuous underground wall pile 21.

The amount of penetration of the continuous underground wall pile 21 into the support stratum 11 in the embodiment depends on the magnitude of the pull-out force and the compressive force due to the overturning moment when a horizontal force acts during an earthquake, a strong wind or the like, and the ground 10. It is determined according to the strength of the support stratum 11. The depth of the internal continuous basement pile 22 or the plurality of internal cast-in-place columnar concrete piles 23 into the support formation 11 is also determined according to the strength of the support formation 11 and the depth of the outer peripheral basement pile 21. .

[0018]

According to the present invention, the following features (a) to (b) are provided by providing the structures described in the claims.
The effect of (f) is achieved. (B) The basic structure of the tower according to the first aspect of the present invention is a base structure constructed underground to support the tower standing on the ground. Around the lower part of the tower in the area of the ground where
An outer peripheral continuous basement pile with a closed section consisting of a vertical underground continuous wall embedded in the supporting stratum of the ground so that the upper end almost matches the ground surface is constructed, and the upper end is placed inside the outer peripheral continuous underground wall pile. At least at least the thickness of the mat slab, the internal continuous basement wall pile or a number of internal cast-in-place concrete piles of a closed section consisting of a vertical ground continuous wall embedded in the supporting stratum of the ground lowered below the ground surface. It is constructed and integrated with the outer continuous basement pile and the internal continuous basement pile or the internal cast-in-place concrete pile above the internal continuous basement pile or each internal cast-in-place concrete pile inside the upper part of the external basement basement pile. A super-tower with a tower ratio of 5 or more is constructed above the mat slab or above the mat slab and the outer peripheral continuous basement pile, and the lower part of the super-tower is Connected to toslabs and outer continuous basement piles or mat slabs or outer continuous basement piles, from mat slabs, outer continuous basement piles and internal continuous basement piles or multiple internal cast-in-place concrete piles The composite foundation can improve the vertical rigidity and rotational rigidity of the foundation, and secure the safety of the super high tower tower against long-term heavy loads, overturning by wind, and overturning during an earthquake Not only can be suppressed, but also the sinking and swinging of the tower can be suppressed. The foundation structure of the ultra-high tower tower according to the present invention is mainly used because the perimeter continuous underground pile of the foundation structure is installed around the tower in a necessary amount in a solid support stratum of the ground, and is mainly used. It can resist the pull-out force and the compressive force due to the overturning moment when the horizontal force acts, and its internal continuous underground wall pile or many internal cast-in-place concrete pillars can support the mat slab and the peripheral continuous underground wall pile. A tower tower with a tower-to-ratio ratio of 5 or more (for example, a height of 300 m or more) can be constructed on a site with a small area with high security. It is.

(2) The basic structure of the tower according to the second aspect of the present invention is a base structure constructed underground for supporting a tower standing on the ground. A vertical underground continuous wall having its upper end lowered below the ground surface by at least the thickness of the mat slab and is buried in the ground support stratum, around the lower part of the tower in the area of the ground where the tower tower is erected A continuous underground wall pile with a closed cross section consisting of the following is constructed, and the inside of this underground continuous underground wall pile is lowered under the surface of the ground by at least the thickness of the mat slab, and is embedded in the ground support stratum. An internal continuous underground wall pile having a closed cross section composed of walls or a number of internal cast-in-place columnar concrete piles is constructed, and an outer peripheral continuous underground wall pile and an internal continuous underground pile are provided above an area surrounded by the outer peripheral surface of the outer peripheral continuous underground wall pile. Wall pile or internal site A mat slab is constructed integrally with the columnar concrete pile, and a super tower tower having a tower ratio of 5 or more is constructed above the mat slab, and a lower portion of the super tower tower is connected to the mat slab. Things,
A layer above the supporting layer of the ground having a certain strength,
In the case where the earth retaining work can be performed relatively easily, support the ground by lowering the upper end of the vertical underground continuous wall constituting the outer peripheral continuous underground wall pile by at least the thickness of the mat slab below the ground surface. It is built in the stratum, and the mat slab is constructed integrally with the outer continuous underground wall pile and the inner continuous underground wall pile or the internal cast-in-place concrete pile above the area surrounded by the outer peripheral surface of the outer continuous underground wall pile. Even if it does, the same effect as the above (a) can be obtained.

(3) In the basic structure of the tower according to the third aspect of the present invention, an underground floor is constructed on the upper side of the mat slab by being connected to the mat slab, and the lower part of the tower is underground. Is connected to the mat slab via the slab, not only can the above-mentioned effects (a) and (b) be achieved, but also the site under the super-high tower tower can be effectively used. (D) In the basic structure of the ultrahigh tower tower of the invention according to claim 4, the diameter of the outer peripheral portion of the outer peripheral continuous underground wall pile is substantially the same as the diameter of the lower peripheral portion of the ultrahigh tower tower or this diameter. Since it is slightly larger than the above, it is not necessary to greatly increase the area of the foundation from the super-high tower tower on the plane in plan, and it is possible to reduce restrictions on site conditions. (E) In the foundation structure of the tower according to the fifth aspect of the present invention, the lower surface of the mat slab is located on the support stratum of the ground, so that the mat slab has a solid ground. It is supported by the supporting stratum, and can mainly support the long-term load directly on the ground. Therefore, it is possible to simplify the internal continuous underground wall pile or a large number of internal cast-in-place columnar concrete piles installed for the purpose of supplementing the support performance of the mat slab and the outer peripheral continuous underground wall pile.

(F) The method for constructing a foundation of an ultra-high tower-like tower according to the invention according to claim 6 is characterized in that an outer peripheral continuous underground wall pile consisting of an underground continuous wall is provided around the ground where the ultra-high tower-like tower is erected. Is constructed, and an internal continuous underground wall pile of closed section consisting of an underground continuous wall or a number of in-situ cast-in-place concrete piles is constructed inside the external continuous underground wall pile, and the inside of the upper part of the external continuous underground wall pile is constructed. In a method of constructing a foundation wherein at least a mat slab is constructed above an internal continuous basement wall pile or each internal cast-in-place columnar concrete pile, the super high tower tower in the area of the ground where the super high tower tower is erected Around the lower part of the underground, constructing a closed-section perimeter continuous underground wall pile consisting of a vertical underground continuous wall rooted in the supporting stratum of the ground with the upper end almost coinciding with the ground surface, and this perimeter continuous underground wall Excavating the ground inside the pile A space having a depth that can form a mat slab is formed, and in this space, at least the mat slab is constructed integrally with the outer peripheral continuous basement wall pile and the internal continuous basement wall pile or the internal cast-in-place columnar concrete pile by reinforced concrete construction. Therefore, by pre-constructing the outer peripheral continuous underground wall pile as a closed type, it is possible to construct the foundation inside the underground without performing the retaining work.

[Brief description of the drawings]

FIG. 1 is an elevational view in which a basic structure of an ultra-high tower-like tower of an embodiment is longitudinally cut.

FIG. 2 is an elevation view showing a first step of constructing the basic structure shown in FIG. 1;

FIG. 3 is an elevation view showing a second step of constructing the basic structure shown in FIG. 1;

FIG. 4 (a) is a cross-sectional view of the embodiment shown in FIG.
2 (b) is a cross-sectional plan view similar to the line AA of FIG. 2 showing another embodiment of the embodiment.

FIG. 5 is an elevational view of a conventional tower-like tower in a longitudinal section.

FIG. 6 is an elevational view in which the basic structure of another conventional tower tower is cut longitudinally.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ground 11 Support stratum 12 Upper stratum 12a Upper stratum of upper stratum (ground surface) 20 Composite foundation 21 Perimeter continuous underground wall pile 22 Internal continuous underground wall pile 23 Internal cast-in-place columnar concrete pile 24 Space 25 Mat slab 26 Basement floor 30 super high tower

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makito Sawamura 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Takeshi Ito 8-21 Ginza, Chuo-ku, Tokyo No. 1 Inside Takenaka Corporation Tokyo Main Branch (72) Inventor Katsuyuki Yokomizo 8-21-1, Ginza, Chuo-ku, Tokyo Inside Tokyo Main Branch Takenaka Corporation (72) Inventor Koji Matsuo Ginza, Chuo-ku, Tokyo 8-21-1, H-chome F-term (reference) in Takenaka Corporation Tokyo Head Office 2D046 DA11

Claims (6)

[Claims] 1. A substructure constructed underground for supporting a super tower tower standing above the ground, around a lower part of the tower in the area of the ground where the tower tower is standing. In the part, an outer peripheral continuous underground pile with a closed cross section consisting of a vertical underground continuous wall rooted in the support stratum of the ground with the upper end almost coinciding with the ground surface is constructed, and inside this outer peripheral continuous underground wall pile An internal continuous underground wall pile of closed section consisting of a vertical underground continuous wall with the upper end lowered at least by the thickness of the mat slab and below the ground surface and embedded in the supporting stratum of the ground, or a number of internal cast-in-place pillars A concrete pile is constructed, and above the internal continuous basement pile or each internal cast-in-place concrete pile inside the upper part of the external continuous basement pile, the external continuous basement-pile and the internal continuous basement pile or the internal cast-in-place concrete Ma with the pile A toslab is constructed, and a super tower tower having a tower ratio of 5 or more is constructed above the mat slab or above the mat slab and the outer peripheral basement pile, and the lower part of the super tower tower is a mat slab and A foundation structure for an ultra-high tower tower, which is connected to an outer continuous underground wall pile or to a mat slab or an outer continuous underground wall pile. 2. A substructure constructed underground for supporting a super tower tower standing on the ground, around a lower part of the tower in a region of the ground where the tower tower is standing. In the part, an outer peripheral continuous underground wall pile of a closed section consisting of a vertical underground continuous wall whose upper end is lowered at least by the thickness of the mat slab from the ground surface and is embedded in the supporting stratum of the ground is constructed, and this outer peripheral continuous underground Inside the wall pile, the inside continuous underground wall pile of a closed section consisting of an underground continuous wall with the upper end lowered by at least the thickness of the mat slab from the ground surface and embedded in the ground support stratum, or a number of internal cast-in-place columns A concrete pile is constructed, and a mat slab is constructed integrally with the outer peripheral continuous underground wall pile and the internal continuous underground wall pile or the internal site cast-in-place concrete pile above the area surrounded by the outer peripheral surface of the outer peripheral continuous underground wall pile, Tower-like ratio above the mat slab 5
A basic structure of an ultra-high tower tower, wherein the above-mentioned ultra-high tower tower is constructed, and a lower portion of the ultra-high tower tower is connected to a mat slab. 3. The underground floor is constructed on the upper side of the mat slab by being connected to the mat slab, and the lower part of the super high tower is connected to the mat slab through the underground floor. Or the basic structure of the tower tower of 2 above. 4. The diameter of the outer peripheral portion of the outer peripheral continuous underground wall pile is substantially the same as or slightly larger than the diameter of the outer peripheral portion of the lower part of the ultra-high tower tower. The basic structure of the super-high tower tower described. 5. The superstructure according to claim 1, wherein a lower surface of the mat slab is located on a supporting stratum of the ground. 6. A continuous underground wall pile consisting of an underground continuous wall is constructed around the ground on which the supertower tower is erected, and a closed wall consisting of an underground continuous wall inside the outer peripheral underground wall pile. An internal continuous basement pile of section or a number of internal cast-in-place concrete piles are constructed, and at least a mat slab above the internal continuous basement pile or each internal cast-in-place concrete pile inside the upper part of the peripheral continuous basement pile. In the method of constructing a foundation that has been constructed, a support stratum for the ground is formed such that the upper end thereof substantially coincides with the ground surface in the area around the ground where the tower is erected, Build a continuous underground wall pile with a closed section consisting of a vertical underground continuous wall embedded in the inside, excavate the ground inside this outer peripheral underground wall pile, and create a space at least deep enough to build a mat slab. Form this space At least construction method for foundation of ultra-high tower like the tower, characterized in that the mat slab constructed in the outer circumferential continuous underground Kabekui and internal continuous underground Kabekui or internal cast-in-place columnar concrete pile integrally with reinforced concrete to.