JPH1136329A - Foundation structure of building and bridge pier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sufficiently satisfactory earthquake-proof structure even when a liquefaction phenomenon or the like of ground has arisen, by forming a foundation connected to the lower end part of the structure and inserted in the support layer of the ground and also forming a wall body connected to the lower end part of the structure and inserted in the non-liquefaction layer of the ground, at the outer peripheral part of the foundation. SOLUTION: Foundation piles 6 connected to the lower end part of a bridge pier 5 and inserted into the support layer 4 of a ground 1 are provided and a wall body 7 connected so as to be fitted to the lower end part of the bridge pier 5 is inserted down to the middle part of a liquefaction layer 3 of the ground 1, at the outer peripheral part of the foundation piles 6. And hence, even when a liquefaction phenomenon of the ground 1 has arisen in an earthequake, as the liquefaction phenomenon arises in the liquefaction layer 2 of the ground 1, the liquefaction phenomenon of the liquefaction layer 2 of the outer peripheral part of the foundation piles 6 is prevented by the wall body 7 formed at the outer peripheral part of the foundation piles 6, and the shearing force acting on the foundation piles 6 in the liquefaction phenomenon can be reduced. And hence, a foundation structure of a building provided with a reliable earthquake-proof structure preventing rupture of the foundation can be obtained.

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 a structure and a pier.

[0002]

2. Description of the Related Art In the Hyogoken-Nanbu Earthquake, destruction damage of foundation piles caused by liquefaction of the surrounding ground has occurred.

[0003] When a foundation pile 6 is provided on the foundation of a structure 5 such as a building or a bridge, a countermeasure is taken to prevent the foundation pile 6 from being destroyed even if a liquefaction phenomenon of the ground 1 occurs. Various studies have been made. For example, as shown in FIG.
When constructing the structure 5 on the ground 1 formed by the liquefied layer 2, the non-liquefied layer 3, and the support layer 4 from the upper layer, the structure 5
A foundation pile 6 is provided so as to be connected to the lower end of the base 1 so as to fit into the support layer 4 of the ground 1. A plurality of reinforcing piles 10 are provided so as to fit into the piles.

However, as described above, in order to provide the reinforcing pile 10 so as to fit into the support layer 4 of the ground 1,
The work for providing the reinforcing pile 10 is very difficult, and the number of work steps and work costs are significantly increased.

Further, in the structure in which the reinforcing pile 10 is inserted into the support layer 4, a certain effect is recognized when the ground 1 liquefies, etc., as compared with the case where the reinforcing pile 10 is not provided. However, the structure was not sufficiently satisfactory as an earthquake-resistant structure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has a seismic structure which can be sufficiently satisfied even if a liquefaction phenomenon of the ground or the like occurs, and a structure capable of greatly reducing the operation cost. It provides the foundation structure of objects and the foundation structure of piers.

[0007]

The gist of the present invention will be described with reference to the accompanying drawings.

The basic structure of a structure 5 when the structure 5 is constructed on the ground 1 formed by the liquefied layer 2, the non-liquefied layer 3, and the support layer 4 from the upper layer. Base 6 which is connected to the lower end of the base and is fitted into the support layer 4 of the ground 1
And a wall 7 provided on the outer periphery of the foundation 6 so as to be connected to the lower end of the structure 5 and fitted into the non-liquefied layer 3 of the ground 1. It is related to.

Further, in the basic structure of the structure according to the first aspect, the wall 7 is formed so as to continuously cover the outer peripheral portion of the basic portion 6.
The present invention relates to a basic structure of a structure characterized by having a structure.

The pier 5 has a basic structure when the pier 5 is constructed on the ground 1 formed by the liquefied layer 2, the non-liquefied layer 3, and the support layer 4 from the upper layer. A base 6 is provided at the lower end of the base 1 so as to be fitted into the support layer 4 of the ground 1. The non-liquefied layer of the ground 1 is connected to the outer periphery of the base 6 at the lower end of the pier 5. The present invention relates to a foundation structure of a bridge pier, characterized in that a wall body 7 to be fitted in 3 is provided.

Further, in the foundation structure of a pier according to the third aspect, a wall structure is provided so as to continuously cover an outer peripheral portion of the foundation portion 6.

[0012]

According to the present invention, a foundation 6 is provided at the lower end of the structure 5 so as to be inserted into the support layer 4 of the ground 1, and the lower end of the structure 5 is provided on the outer periphery of the foundation 6. Since the wall 7 is provided so as to be connected to the non-liquefied layer 3 of the ground 1 so that the liquefaction of the ground 1 that occurs during an earthquake or the like occurs, the liquefaction is mainly caused by the ground 1. Is generated in the liquefied layer 2 of the base portion 6, the liquefaction phenomenon of the liquefied layer 2 on the outer periphery of the base portion 6 is suppressed by the wall body 7 provided on the outer periphery of the base portion 6, and the liquefaction phenomenon causes It is possible to reduce the shearing force applied to the structure, and to provide a foundation structure of a structure having a highly reliable earthquake-resistant structure without breaking the foundation portion 6.

Then, the reinforcing pile 10 is connected to the support layer 4 as in the prior art.
Since the wall 7 is inserted into the non-liquefied layer 3 instead of the wall 7, the installation work of the wall 7 becomes very simple, and the number of work steps and work costs can be greatly reduced. .

Further, since the wall 7 is provided so as to continuously cover the outer peripheral portion of the base portion 6, the influence of the liquefaction phenomenon on the base portion 6 can be reliably suppressed.

When the structure 5 is the pier 5, the same operation and effect as those of the above-mentioned structure 5 are obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A basic structure of a structure and a pier according to an embodiment of the present invention will be described below with reference to the drawings.

This embodiment is a basic structure of a pier 5 as a basic structure of a structure 5 such as a building or a bridge, which will be described below.

As shown in FIGS. 1 and 2, the basic structure of the pier 5 is such that the pier 5 is constructed on the ground 1 formed by the liquefied layer 2, the non-liquefied layer 3, and the support layer 4 from the upper layer. A foundation structure of the bridge pier 5 in which the foundation stake 6 is provided at the lower end of the pier 5 so as to fit into the support layer 4 of the ground 1.
A wall 7 is provided on the outer periphery of the foundation pile 6 so as to be fitted to the lower end of the pier 5 in a state where the wall 7 is connected to the non-liquefied layer 3 of the ground 1.
Is provided so as to be fitted halfway.

The wall 7 is provided so as to continuously cover the outer peripheral portion of the foundation pile 6.

The wall 7 is made of concrete, concrete with reinforcing material or the like having a predetermined strength.

Various experimental studies have been conducted to confirm the effects of the basic structure of the structure as in the present embodiment. The most effective case is that the wall 7 is inserted into the non-liquefied layer 3. When the wall 7 is provided only on the liquefied layer 2, the effect of suppressing the influence of the liquefaction on the foundation pile 6 is small, and when the wall 7 is inserted into the support layer 4, ,
The installation work of the wall 7 is extremely difficult, and the number of work steps and work costs are greatly increased.

The provision of the wall 7 as the basic structure of the structure may be such that the wall 7 may be provided at the same time when the foundation pile 6 is newly installed, or the wall 7 may be provided to reinforce the existing foundation pile 6.
May be added.

In this embodiment, as described above, the foundation pile 6 is provided so as to be continuously connected to the lower end of the pier 5 and fitted into the support layer 4 of the ground 1. The wall 7 is provided so as to be continuously connected to the lower end of the ground 1 so as to be fitted halfway into the non-liquefied layer 3 of the ground 1. Therefore, even if a liquefaction phenomenon of the ground 1 that occurs during an earthquake or the like occurs, the liquefaction occurs. Since the phenomenon mainly occurs in the liquefied layer 2 of the ground 1, the liquefaction phenomenon of the liquefied layer 2 on the outer periphery of the foundation pile 6 is suppressed by the wall body 7 provided on the outer periphery of the foundation pile 6, It is possible to reduce the shearing force applied to the foundation pile 6 due to the formation phenomenon, and to provide a foundation structure of a structure having a highly reliable earthquake-resistant structure without breaking the foundation pile 6.

Then, the reinforcing pile 10 is connected to the support layer 4 as in the prior art.
Since the wall 7 is inserted halfway into the non-liquefied layer 3 instead of the wall 7, the installation work of the wall 7 becomes very simple, and the number of work steps and work costs are greatly reduced. Can be.

Further, since the wall 7 is provided so as to continuously cover the outer peripheral portion of the foundation pile 6, the influence of the liquefaction phenomenon on the foundation pile 6 can be surely suppressed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a basic structure of a pier according to one embodiment of the present invention.

FIG. 2 is a perspective view showing a foundation structure of a pier according to one embodiment of the present invention.

FIG. 3 is an explanatory view showing a basic structure of a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Liquefied layer 3 Non-liquefied layer 4 Support layer 5 Structure, pier 6 Foundation, foundation pile 7 Wall

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takaaki Kihara 3-10 Ichibanoridoricho, Niigata City, Niigata Prefecture Inside Fukuda Gumi Co., Ltd. (72) Hiroshi Nakamura 3-10 Ichibanoridoricho, Niigata City, Niigata Prefecture Fukuda Gumi Co., Ltd. (72) Inventor Hiromichi Takatori 3-10, Ichibanoridoricho, Niigata City, Niigata Prefecture Co., Ltd. Tadashi Nagano, Inventor Tadashi Nagano 3-10, Ichibanoridoricho, Niigata City, Niigata Prefecture Stock Association The company Fukuda group

Claims (4)

[Claims] 1. A basic structure of a structure when the structure is constructed on the ground formed by a liquefied layer, a non-liquefied layer, and a support layer from an upper layer, wherein a lower end of the structure is A base portion is provided so as to be continuously connected to the support layer of the ground, and a wall body is provided at an outer peripheral portion of the base portion so as to be connected to a lower end portion of the structure and fit into the non-liquefied layer of the ground. The basic structure of a structure characterized by the following. 2. The basic structure of a structure according to claim 1, wherein a wall is provided so as to continuously cover an outer peripheral portion of the basic portion. 3. A basic structure of a pier when a pier is constructed on the ground formed by a liquefied layer, a non-liquefied layer, and a support layer from an upper layer, the pier being connected to a lower end of the pier. A base portion that fits into the support layer of the ground, and a wall that is connected to the lower end of the pier and that fits into the non-liquefied layer of the ground is provided on the outer peripheral portion of the base portion. Foundation structure of pier. 4. The pier foundation structure according to claim 3, wherein a wall body is provided so as to continuously cover an outer peripheral portion of the foundation portion.