JP3455861B2 - Foundation structure and foundation construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure suitable for use in rebuilding an existing building and a foundation construction method.

[0002]

2. Description of the Related Art A building such as a building is roughly divided into a foundation formed in the ground and a superstructure formed above the foundation. When such a building deteriorates or its usage is changed, the existing building is demolished, and then a new building is built to meet the requirements. After the foundation has been demolished and removed, it is common to build the foundation and superstructure of a new building here.

[0003]

However, the above-mentioned conventional method of constructing the foundation has the following problems. First of all, it goes without saying that dismantling and removing existing buildings, especially foundations, requires a great deal of time and cost. Moreover, the foundation is designed and constructed with an emphasis on durability, and its quality is stable over a long period of time. For this reason, when rebuilding a building, it is a waste of time to demolish a foundation that can still fully function and build a new foundation there, which is a waste of time and impedes cost reduction. It was a factor. Further, in recent years, it has been desired to reduce the amount of waste such as concrete shells generated when an existing building is demolished. To avoid this problem, even if the existing foundation is left as it is in the ground, this merely postpones the processing. Furthermore, when the existing foundation is demolished, noise and vibration are generated, which may adversely affect the neighboring environment. In addition, the existing foundation may be loosened, which may cause loosening, subsidence, or deformation of the surrounding ground, which requires a great deal of cost and construction period. The present invention has been made in consideration of the above points, and provides a basic structure and a method of constructing a basic structure capable of reducing the cost, shortening the construction period, and reducing the amount of waste generated. The purpose is to

[0004]

The invention according to claim 1 is
It is a basic structure applied when rebuilding an existing building.
And a plurality of foundation piles or caisson foundations are arranged around the first foundation, which is an existing foundation constructed in the ground, and are opposed to each other across the first foundation. It is characterized in that it is composed of a foundation pile or a caisson foundation and a second foundation constructed by laying foundation beams.

The invention according to claim 2 is the foundation structure according to claim 1, wherein an elastic member is interposed between the foundation beam of the first foundation and the foundation beam of the second foundation. It has a feature.

The invention according to claim 3 rebuilds an existing building.
It is a method of constructing the foundation that is applied when
After arranging a plurality of foundation piles or caisson foundations around the first foundation that is an existing foundation that has been built , an elastic member is arranged on the first foundation, and on the foundation piles or caisson foundation. A second foundation consisting of the foundation beam and the foundation pile or caisson foundation is constructed by straddling the foundation beam on the first foundation.

The invention according to claim 4 is the method for constructing a foundation according to claim 3, wherein when the foundation beam is installed,
Displacement of one or both of the foundation beam and the first foundation is measured by a displacement measuring means, and the load applied to the first foundation is adjusted.

[0008]

In the invention according to claim 1, the existing building is rebuilt.
In this case, the foundation was composed of a first foundation and a second foundation formed by laying foundation beams on a plurality of foundation piles or caisson foundations arranged around the first foundation. Thereby, the load of the superstructure of the new building constructed on such a foundation can be shared and supported by the first foundation and the second foundation. At this time, by using the existing foundation as the first foundation, it is possible to construct the foundation of the new building only by newly constructing the second foundation.

According to the second aspect of the invention, the elastic member is interposed between the first foundation beam and the second foundation beam. With this, the first foundation and the second foundation can be separated, and if an additional device such as a damper is added,
It is possible to suppress the transmission of vibration from the first foundation to the second foundation and the superstructure such as a building constructed on the second foundation during an earthquake or the like.

According to the invention of claim 3, an existing building is built.
When replacing, use the existing foundation as the first foundation,
After arranging multiple foundation piles or caisson foundations around ,
The elastic member is arranged on the first foundation, and the foundation beam is installed on the foundation pile or the caisson foundation, so that the second foundation is constructed so as to straddle the first foundation. As a result, it is possible to build a foundation consisting of the first foundation and the second foundation. At this time, as the first foundation, the existing
Since the foundation of the existing building is used, it can be used as it is without destroying the existing foundation and can be used as a part of the foundation of the new building. Therefore, the existing foundation is demolished and the new foundation is constructed. Can be saved.

In the invention of claim 4, when the foundation beam is installed, the displacement of either or both of the foundation beam and the first foundation is measured by the displacement measuring means, and the load applied to the first foundation is measured. The configuration is adjusted. As a result, a balanced load distribution can be achieved between the first foundation and the second foundation.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. Here, a foundation structure and a foundation construction method according to the present invention will be described using an example in which the foundation structure and the foundation construction method are applied to rebuilding an existing building. FIG. 1 shows an example of a basic structure according to the present invention. In this figure, reference numeral 1
Is a new building, 2 is a superstructure of the new building 1, and 3 is a foundation of the new building 1. Foundation part 3 of new building 1
Is the existing foundation (first foundation) of the building (not shown; hereinafter referred to as "existing building") that was previously installed in this place. 4
And a newly constructed new foundation (second foundation) 5.

The existing foundation 4 is, for example, a pile foundation made of a reinforced concrete structure, and the foundation plate 7 located in a horizontal plane on the foundation piles 6, 6, ...
It has a structure that is erected.

Concrete piles or steel pipe piles (foundation piles) 8, 8, ... Are buried on the outer peripheral side of the existing foundation 4 at predetermined intervals. Then, on the steel pipe piles 8 and 8 which are located across the existing foundation 4, for example, a reinforced concrete foundation beam 9 is installed so as to straddle the existing foundation 4. The steel pipe piles 8, 8, ... And the foundation beams 9 constitute the new foundation 5 having a substantially gate-shaped cross section.

Each foundation beam 9 of the new foundation 5 and the existing foundation 4
Between the base plate 7 and the elastic plate 10 made of rubber,
, And an accessory device such as a damper (not shown) are interposed, and each elastic member 10 is arranged so as to be positioned vertically above the foundation pile 6.

In the foundation portion 3 composed of the existing foundation 4 and the new foundation 5 as described above, the load of the superstructure 2 is not limited to the new foundation 5 but a part thereof is elastic members 10, 1.
It is also supported by the existing foundation 4 via 0, .... At this time, since the elastic members 10, 10, ... And accessory devices such as dampers are interposed between the existing foundation 4 and the new foundation 5, these elastic members 10 and dampers, etc. are installed in the event of an earthquake. With the attached device, vibration
It is possible to suppress transmission from the existing foundation 4 to the new foundation 5 and the superstructure 2. As a result, the foundation part 3 of the new building 1 forms one form of the vibration isolation structure.

Next, a new building 1 having the above-mentioned foundation 3
The construction method of is explained. For this purpose, first, only the upper structure of the existing building (not shown) is dismantled and removed, and the existing foundation 4 is left in the ground G as it is.

Next, the steel pipe piles 8, 8, ... Are driven into predetermined positions on the outer peripheral side of the existing foundation 4. Next, existing foundation 4
The elastic members 10, 10, ... Are set at predetermined positions on the upper surface of the. After this, the foundation beam 9 is erected on the steel pipe piles 8 and 8 by cast-in-place casting or precast concrete construction.

At this time, the displacements of the existing foundation 4 and the foundation beam 9 are measured by a displacement measuring means such as a water beam displacement gauge, so that the supporting load distributed to the existing foundation 4 and the foundation beam 9 and the foundation beam 9 are 4 is adjusted to be separated from each other.

After this, the foundation part 3 constructed in this way
New building 1 by building superstructure 2 on top
Is completed.

In the construction method of the foundation part 3 described above, after dismantling and removing only the upper structure of the existing building (not shown), the steel pipe piles 8, 8, ... Are arranged around the existing foundation 4, and
The elastic members 10, 10, ... Are set on the existing foundation 4 and the foundation beam 9 is installed between the steel pipe piles 8, 8.
With this, the existing foundation 4 of the existing building (not shown) can be used as it is without being demolished, and the foundation part 3 of the new building 1 can be used.
Can be configured. Therefore, the construction period for constructing the base portion 3 can be significantly shortened as compared with the conventional case. Further, in terms of cost, not only the construction cost of the base portion 3 but also the amount of use of materials such as concrete can be significantly reduced, so that material costs can also be reduced. Furthermore, since the waste generated by demolishing the existing foundation 4 can be reduced, the labor and cost required for the treatment can be reduced. In addition to this, since the existing foundation 4 is not demolished,
As a matter of course, there is no problem such as noise, vibration, loosening, subsidence, deformation, etc. of the surrounding ground, which occurs when this is demolished.

Further, in the above-mentioned construction method of the base portion 3,
When the foundation beam 9 is installed, the displacement measuring means measures the displacement of the existing foundation 4 and the foundation beam 9. As a result, the supporting load distributed to the existing foundation 4 can be optimally adjusted, and the load distribution can be balanced between the foundation beam 9 and the existing foundation 4.

In the above embodiment, when the horizontal span of the existing foundation 4 is large, the structure shown in FIG. 2 may be used. As shown in this figure, an existing foundation (first foundation) 11 of an existing building (not shown) is divided into a plurality of existing foundations 11a and 11b, and a steel pipe pile 8'is buried in the middle portion between them. , The foundation beam 9'to these steel pipe piles 8,
The new foundation 5'is constructed by being erected on 8, 8 '. The same effect as that of the above-described embodiment can be obtained by the base portion 3 ′ of the new building 1 ′ having such a configuration.

Further, the structure of the foundation portion 3'is similarly applied to the case of using the existing foundations 11a and 11b of a plurality of existing buildings (not shown) when constructing the new building 1'having a large plane scale. can do.

Further, in the above-mentioned embodiment, the structure of the new foundation 5 is not limited at all, and the steel pipe pile 8
May be other pile-shaped foundations such as concrete piles,
It may also be used as a caisson foundation. The structure of the foundation beam 9 is not limited to the reinforced concrete structure, and may be another structure such as a structure including a steel frame and a slab laid on the upper surface thereof.

Further, although the elastic member 10 made of rubber is used, it may be used as various springs, for example. Instead of the elastic member 10, various other vibration isolator, jack device, etc. are newly provided. It may be configured to be interposed between the foundation 5 and the existing foundation 4. For example, if a vibration isolator is provided, the vibration isolation performance of the new building 1 can be significantly improved. Further, when the jack device is adopted, for example, when uneven ground subsidence occurs, the jack device is extended in accordance with the subsidence amount at each location to ensure that the load of the new foundation 5 is applied to the existing foundation 4. Therefore, the new building 1 can have a structure that can cope with uneven settlement. The jack device can also be used when installing the vibration isolator or the elastic member 10 during construction.

The elastic member 10 is provided not only between the new foundation 5 and the existing foundation 4 but also between each steel pipe pile 8 and the foundation beam 9.
Alternatively, a vibration isolator may be interposed. With such a configuration, the vibration isolation performance of the new building 1 can be further improved.

In addition to this, the structural types of the existing foundations 4 and 11 are not limited, and any type of basic structure can be used .

[0029]

As described above, according to the foundation structure of claim 1, when the existing building is rebuilt, the foundation is rebuilt.
Of the existing foundation was used as the first foundation, and a plurality of foundation piles or caisson foundations arranged around the first foundation and a second foundation formed by erection of foundation beams. This allows
The load of the superstructure supported on the foundation can be shared and supported by the first foundation and the second foundation. At this time, use the existing foundation as the first foundation
Therefore, it is possible to achieve the effects of reducing the cost for constructing the foundation, shortening the construction period, and reducing the waste.

According to the second aspect of the basic structure, the elastic member is interposed between the first foundation beam and the second foundation beam. As a result, the first foundation and the second foundation can be separated, and at the time of an earthquake, etc., the first foundation can be changed to the second foundation and the superstructure such as a building constructed on it. It is possible to suppress the transmission of vibration, and it is possible to enhance the vibration isolation performance of a building or the like constructed in the basic state.

According to the method for constructing a foundation according to claim 3,
When rebuilding an existing building, make the existing foundation the first foundation
After arranging a plurality of foundation piles or caisson foundations around it , elastic members are arranged on the first foundation and the foundation beams are erected on the foundation piles or caisson foundations. The foundation was constructed so as to straddle the first foundation. As a result, it is possible to construct a foundation such as a building that is composed of the first foundation and the second foundation. At this time, whether to use the foundation of the existing building as the first foundation
Et al., Was used as it is without demolished the foundations of the existing building, which can be a part of the foundation of the new building. Therefore, the construction period and cost for constructing the foundation can be significantly reduced. Further, it is possible to reduce the waste generated when the existing foundation is demolished, and also reduce the labor and cost required for the treatment.
In addition to this, it is possible to suppress noise, vibration, loosening, subsidence, deformation, etc. of the surrounding ground that occur when the existing foundation is demolished.

According to the method for constructing a foundation according to claim 4,
When the foundation beam is installed, the displacement of either or both of the foundation beam and the first foundation is measured by the displacement measuring means, and the load applied to the first foundation is adjusted. As a result, a balanced load distribution can be achieved between the first foundation and the second foundation.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a building constructed by applying a foundation structure and a foundation construction method according to the present invention.

FIG. 2 is a vertical sectional view showing another example of a building constructed by applying the foundation structure and the foundation construction method according to the present invention.

[Explanation of symbols]

3 Basic Department (Basic) 4,11 Existing foundation (first foundation) 5,5 'New foundation (second foundation) 8,8 'steel pipe pile (foundation pile) 9 foundation beams 10 Elastic member

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Claims (4)

(57) [Claims] [Claim 1] Foundation applied when rebuilding an existing building
The existing foundation that is constructed in the ground.
That the first basic, around the said first underlying foundation pile or caisson foundation with a plurality disposed, foundation beams are bridged on these foundation pile or caisson foundation facing across said first basic A basic structure characterized in that it is composed of a second foundation consisting of 2. The foundation structure according to claim 1, wherein an elastic member is interposed between the foundation beam of the first foundation and the foundation beam of the second foundation. [Claim 3] Foundation to be applied when rebuilding an existing building
The existing foundation that is constructed in the ground
After arranging a plurality of foundation piles or caisson foundations around the first foundation that is , laying elastic members on the first foundations and erection foundation beams on the foundation piles or caisson foundations. The method for constructing a foundation is characterized by constructing a second foundation consisting of the foundation beam and the foundation pile or caisson foundation so as to straddle the first foundation. 4. The method of constructing a foundation according to claim 3, wherein when the foundation beam is erected, displacement of one or both of the foundation beam and the first foundation is measured by a displacement measuring means, A method for constructing a foundation, comprising adjusting a load applied to the first foundation.