JP2003119814A - Structure and method for reinforcing foundation structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable construction work for the purposes of enhancing the earthquake resistance and base isolation properties of an existing building and preventing ground subsidence. SOLUTION: An existing building 1 inclined by differential settlement is lifted by a lifting apparatus 6 such as a jack and supported and a hole 1 is formed by digging the underside of the foundation concrete 3 of the building 1. An expanded-resin base 5 is laid in the hole 1 and concrete 6 is placed between the base 5 and the foundation concrete 3 for integration. Thus, it is possible to enhance the earthquake resistance and base isolation properties of the existing building after installation and prevent ground subsidence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure and a reinforcing construction method for a foundation structure of a building which can be constructed as a countermeasure against an earthquake, ground subsidence or differential subsidence of an existing building.

[0002]

[Problems to be Solved by the Invention] Conventionally, when an existing building such as a house suffers from uneven settlement, the load is concentrated at one place,
Problems such as rain blown from the window and loss of airtightness occur.In particular, poor rain storage causes corrosion of the skeleton, shortening the life of the building and significantly impairing seismic performance. Be done. As a countermeasure, in order to reinforce against earthquakes of buildings or vibrations of traffic and subsidence,
How to increase the amount of foundation concrete of the building, increase the amount of reinforcing steel of the foundation, how to hit the pile to support the structure with the bearing capacity of the pile, or to use cement-based ground improvement material to weaken There are known methods for improving the ground.

However, although these measures are effective when the ground is to be constructed before the building is built in advance, the construction of the existing structure not only leads to a longer construction period. In general, it is difficult to live in the building during the construction period.
The financial burden was heavy.

The present invention solves such a problem and provides a reinforcing structure and a reinforcing construction method for a foundation structure in a building, which can be applied to an existing building afterwards with a differential settlement prevention measure and a ground settlement prevention measure. The purpose is to

[0005]

A reinforcing structure for a foundation structure in a building according to the invention of claim 1 is a reinforcing structure for a foundation structure in a structure for correcting an existing building which has been unevenly submerged to a horizontal level. The building is lifted and supported by the lifting means, and a hole is formed by excavating the lower side of the sunken foundation structure to remove soil, and a foamed resin board is laid in this hole to construct the building. It supports the basic structure in.

According to the structure of claim 1, it is possible to correct an existing building that has been unevenly subsided to a horizontal level, improve the seismic resistance and seismic isolation of the existing building, and By replacing the soil on the side with a foamed resin board, a lightweight foundation structure will be created, which will be a measure to prevent ground subsidence of the building. In addition, since the existing structure can be easily reinforced, the construction period is short, and it is economically inexpensive.

According to a second aspect of the present invention, there is provided a reinforcing structure for a foundation structure in a building, wherein concrete for integrating the foam resin board and the foundation structure is filled between the foam resin board and the existing foundation structure. It will be.

According to the structure of claim 2, the foundation structure and the foamed resin board are integrated, and the seismic resistance and seismic isolation of the existing building are improved.

According to a third aspect of the present invention, there is provided a foundation structure reinforcing method,
A method for reinforcing a foundation structure in a structure for correcting an existing building that has been differentially submerged to a horizontal level by excavating the underside of the basic structure of the building while supporting the existing building that has been differentially submerged. After forming a hole and then laying a foam resin board in the hole under the basic structure formed by removing soil, concrete is filled between this foam resin board and the existing basic structure to integrate it. It will be made.

According to the third aspect of the present invention, it is possible to correct the existing building that has been unevenly subsided to a horizontal level, improve the seismic resistance and seismic isolation of the existing building, and By replacing the soil on the side with a foamed resin board, a lightweight foundation structure will be created, which will be a measure to prevent ground subsidence of the building. In addition, since the existing structure can be easily reinforced, the construction period is short, and it is economically inexpensive.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 to 4, 1 is a building built on a soft ground 2 and 3 is a building 1
It is the basic concrete that is the basic structure of. In the present embodiment, a two-story general house is shown as the building 1.

Numeral 4 is a hole formed by excavating and removing the lower part of the existing basic concrete 3 of the portion 1a to be reinforced. Instead of the soil thus removed, a foamed resin board 5 having a smaller density than the soil is laid. Thus, the ground subsidence stress of the building can be reduced, which is extremely effective for the ground subsidence prevention measures of the building. The foamed resin board 5 and the basic concrete 3 are joined with concrete 7. GL in the figure is a ground line.

The foamed resin board 5 used in the present invention may be any one as long as it is lightweight and has a required compressive strength, and foamed polystyrene, polystyrene, polypropylene, polyethylene, polyurethane, polyvinyl chloride or the like is used. Further, the concrete 7 for joining the foamed resin board 5 and the basic concrete 3 has a reinforcing bar 8 inside.

Next, the construction method of the present invention will be specifically described step by step.

First, the foundation concrete 3 of the existing building 1 is investigated, and due to the uneven settlement, the building 1 to 3 is bent, tilted, or distorted, and the seismic performance is deteriorated.
a is searched for, the weight of the building 1 including the basic concrete 3 is analyzed, and the amount of soil discharged at the lower part of the basic concrete 3 and the optimum compressive strength of the foamed resin board 5 for the place 1a are determined.

Next, at the above-mentioned location 1a, the ground 2 of the foundation concrete 3 is excavated in the lower part while the building 1 is supported by the lifting device 6 such as a hydraulic jack or an air jack, and the preset soil is removed. Exclude. As a result, the hole 4 is formed in the lower portion of the basic concrete 3.
After the hole 4 thus excavated is compacted, a foamed resin board 5 is laid on the hole 4. Then, a concrete form (not shown) is formed on the foamed resin board 5, and the reinforcing bars 8 are assembled in the concrete form. After that, the concrete 7 is poured into the space between the foamed resin board 5 and the basic concrete 3 and cured and hardened to join and integrate the basic concrete 3 and the foamed resin board 5 of the building 1, and then GL. Spread the soil until it is firm. As a result, it is possible to correct the existing building 1 that has been unevenly sinked to a horizontal level. Further, by balancing the excess weight of the building 1, the foundation concrete 3 and the concrete 7 with the load of the excavated sand excavated from the ground 2, it is possible to form a so-called floating foundation structure in which an increase in underground stress is suppressed. By laying the foamed resin board 5 having a density smaller than the weight of earth and sand removed by excavation in this way, an increase in settlement stress is prevented, and even if the ground 2 is soft, the settlement of the building 1 is suppressed and a stable state is achieved. Can be kept, building 1
The seismic resistance and ground subsidence resistance are dramatically improved. further,
Since the existing building 1 can be easily reinforced, the construction period is short, and it is economically inexpensive.

In the above embodiment, the existing building 1 has been described. However, in the case of the ground 2 having a small bearing capacity, if there is a possibility that differential settlement will occur after the building, the ground will be improved at the time of building. be able to.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, although FIG. 3 shows an example in which the foamed resin board 5 is provided in the portion 1a on the inclined side due to the uneven settlement, as shown in FIG. 4, the foamed resin board 5 is also foamed in the portions 1a and 1b on both sides of the building 1. A resin board 5 may be provided. Further, it goes without saying that the building 1 is not limited to a two-story structure and can be applied to a flat house.

[0019]

According to the reinforcing structure for a foundation structure of a building according to the first aspect of the present invention, there is provided a reinforcing structure for a foundation structure in a structure for correcting an existing building which has been unevenly sinked to a horizontal level. The building is lifted and supported by the structure, and a hole is formed by excavating the lower side of the subsided foundation structure to remove soil, and a foam resin board is laid in this hole to form the foundation of the building. As it supports the structure, it is possible to modify the existing building that has been unevenly subsided to a horizontal level, and the existing building can be easily reinforced so that the construction period is short and it is economically inexpensive. Has the effect of being.

According to the reinforcement structure of the basic structure in the building of the invention of claim 2, between the foamed resin board and the existing foundation structure, concrete for filling the foamed resin board and the foundation structure is filled. As a result, the foundation structure and the foamed resin board are integrated, and the seismic resistance and seismic isolation of the existing building are improved.

According to the reinforcement method for a foundation structure of the third aspect of the present invention, there is provided a reinforcement method for a foundation structure in a structure for correcting an existing building that has been unevenly submerged to a horizontal level, and the existing building having been differentially submerged. After excavating the lower side of the basic structure of the building to form a hole, and then laying a foamed resin board in the hole in the lower part of the basic structure formed by removing soil, Since it is made by filling concrete between the foamed resin board and the existing foundation structure and integrating them, the seismic resistance and seismic isolation of the existing building are improved, and the lower part of the existing foundation structure is By replacing the soil with a foamed resin board, a lightweight foundation structure will be provided, and it will be a measure to prevent ground subsidence of the building. In addition, since the existing structure can be easily reinforced, the construction period is short, and it is economically inexpensive.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a foundation portion of a building showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the entire building before construction.

FIG. 3 is a cross-sectional view showing the entire building after the construction.

FIG. 4 is a cross-sectional view showing the entire building in which foamed resin boards are provided on both sides of the building.

[Explanation of symbols]

1 building 2 ground 3 Foundation concrete (foundation structure) 4 holes 5 Foam resin board 6 Lifting device 7 concrete

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 501401467             Fumio Ota             33-2 Senjunaka-cho, Adachi-ku, Tokyo (72) Inventor Yoshihiro Sato             Niigata Prefecture Nakamurabara-gun Muramatsu-cho 3 No. 3 Inc.             Sato Jukennai F-term (reference) 2D046 BA00 DA18

Claims (3)

[Claims] 1. A reinforcing structure for a foundation structure in a structure for correcting an existing building that has been unevenly submerged to a horizontal level, wherein the structure is raised and supported by an elevating means and the lower side of the submerged basic structure. A hole is formed by excavating the ground to remove soil, and a foamed resin board is laid in the hole to support the base structure of the building. Construction. 2. The building according to claim 1, characterized in that between the foamed resin board and the existing foundation structure, concrete for integrating the foamed resin board and the foundation structure is filled. Reinforcement structure of foundation structure. 3. A method for reinforcing a foundation structure in a building, which corrects an existing building that has been unevenly submerged to a horizontal level, the method comprising: After digging the lower side to form a hole, and then laying a foam resin board in the hole at the bottom of the foundation structure formed by removing soil, between this foam resin board and the existing foundation structure Reinforcement method of foundation structure in building characterized by being filled with concrete and integrated.