JPH10227036A - Building foundation reinforcing method and structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing method and its structure for compressing and reinforcing a slab for a new building foundation with reinforcing concrete and reinforcing bars. SOLUTION: A building foundation reinforcing method comprises the steps of providing a number of horizontal holes 10c at preset spaces in places inside the vertical part 10b of a foundation 10, of inserting and joining one ends of inserted bars 14 into the respective horizontal holes 10c and cantilever-extending the other ends into a space inside the vertical part 10b of the foundation 10, and of pouring reinforcing concrete 15 with high strength and high fluidity containing organic or non-organic based reinforcing fibers into an area encircled with the foundation 10 to be high enough to cover a number of inserted bars 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation for a building, and more particularly to a method and a structure for reinforcing a building foundation for the purpose of strengthening the foundation of a new wooden building.

[0002]

2. Description of the Related Art The foundation of a building is for safely supporting the building. For this purpose, the foundation must be fixed to the ground and have a solid structure. Various types of foundations are used depending on the condition of the ground, the structure of the building, and the difference in scale. This type is determined at the structural design stage based on the results of the ground survey.

Conventionally, two types of structures, a cloth foundation and a solid foundation, have been generally used as the foundation of a wooden building. The cloth foundation is a long and continuous foundation, generally having an inverted T-shaped cross section, and is provided continuously along the foundation at the bottom of the building. The solid foundation refers to a foundation provided in a plate shape over the entire bottom of the building, and supports the weight of the building with the entire area of the bottom plate-shaped foundation.

FIG. 5 is a cross-sectional view showing a conventional general cloth foundation and floor structure, and FIG. 6 is a perspective view showing a conventional general cloth foundation structure. In each figure,
Is made of concrete, has an inverted T-shaped cross section, and comprises a horizontal portion 10a for supporting a building and a vertical portion 10b integrally connected to the horizontal portion 10a at right angles. This foundation 10
Are provided continuously along the base 20 at the bottom of the building, and are provided with notches 13 for providing underfloor ventilation openings at predetermined positions. In a portion surrounded by the foundation 10, slab concrete 11 is laid to suppress moisture from the ground, and gang stones 12 for supporting a floor slab 24 described later are arranged at predetermined intervals.

[0005] The general floor structure provided on the foundation 10 in FIG. 5 is called a raised floor. The raised floor is provided with a base 20 disposed above the vertical portion 10 b supporting the outer pillar of the foundation 10, a large-scale 21 provided to extend over the base 20, and a vertical cross on the large-size 21. And a floor plate 23 spread on the joist 22. In addition, Exhibit 21 is floor or 2
Via 4, it is also supported by a shackle 12.

[0006]

[0005] Wooden buildings are used today only for small buildings such as houses. However, when looking at the number of annual buildings in Japan by structure, most of them are wooden buildings. Things. As one of the advantages of wooden buildings,
Modification and disassembly are easy, but there are some problems. That is, in recent years, in order to obtain a comfortable housing space, the floor area of a wooden house or the like is often increased. For example, a one-story building is a two-story building and a two-story building is a three-story building.
Buildings with floors are becoming common. in this case,
In the conventional general foundation strength, it has been a problem whether the general foundation of the building can tolerate the increased weight of the building to be increased.

In addition, the foundation of the building has a maximum bending moment at the center of the opening (gateway) at the center of the opening (gateway), regardless of the outer periphery and the interior, so that the foundation has a tensile load at the upper part and a compressive load at the lower part. Receive a load. Moreover, since the concrete is a material that is weak against tensile load, if the bending moment applied to the foundation increases due to extension or remodeling, it is necessary to reinforce this portion. Furthermore, in order to maintain the durability of the wood constituting the building, it is necessary to always provide a dry state. Therefore, it is required to provide underfloor ventilation ports having a predetermined area at regular intervals. In this notch, the strength of the foundation is significantly reduced, but in conventional wooden buildings, reinforcement measures have been taken in the notch of the foundation for some time, but when the upper load is increased, it is not sufficient.

[0008] Therefore, when the load on the foundation increases due to an increase in the building area or the like, it is necessary to take measures to reinforce the notch. Furthermore, in recent years, with the growing public interest in earthquakes, some people are concerned about the earthquake resistance of ordinary houses. For the above reasons, there has been a demand for a method and a structure capable of easily and surely reinforcing the foundation of a newly constructed building and its structure. An object of the present invention is to provide a method for reinforcing a foundation of a new building and a foundation reinforcing structure reinforced in such a manner in order to solve the above problems.

[0009]

According to a first aspect of the present invention, there is provided a foundation in which a reinforcing bar is buried inside a horizontal portion for supporting a building and a vertical portion integrally connected to the horizontal portion at a right angle. A method in which a slab is provided continuously along a base at the bottom of a building to reinforce a building foundation that receives a ground reaction force against the weight of the building, wherein the slab is provided at a predetermined position inside a vertical portion of the foundation. A step of providing a large number of bottomed or penetrating horizontal holes at intervals, and inserting and connecting one end of a reinforcing bar to each of the horizontal holes, and the other end side is cantilevered in a space inside the vertical portion of the foundation. And the process of extending to
A high-strength and high-fluidity reinforcing concrete mixed with an organic or inorganic reinforcing fiber is coated on a large number of the reinforcing bars in a region surrounded by the foundation, and structurally necessary. And pouring to a height.

According to a second aspect of the present invention, as the reinforcing material,
It is characterized in that it is formed in a rod shape using any one selected from the group of continuous fibers such as reinforcing bars, carbon fibers, aramid fibers, and glass fibers.

According to a third aspect of the present invention, a foundation slab in which a reinforcing bar is embedded inside a horizontal part supporting a building and a vertical part integrally connected to the horizontal part at a right angle is provided. A reinforcing structure of a building foundation that receives a ground reaction force against the weight of the building by being provided continuously along the base of the bottom, and in an area surrounded by the foundation, either an organic or inorganic system A high-strength and high-fluidity reinforcing concrete mixed with the above-mentioned reinforcing fibers covers a number of the reinforcing bars and is poured into a structurally necessary height.

According to a fourth aspect of the present invention, a foundation slab in which a reinforcing bar is embedded inside a horizontal portion which supports a building and a vertical portion which is integrally connected to the horizontal portion at right angles to the horizontal portion is provided. A reinforcing structure for a building foundation that receives a ground reaction force against the weight of the building by being continuously provided along the base of the bottom, and has a plurality of bottomed shapes at predetermined positions inside a vertical portion of the foundation at predetermined intervals. Alternatively, a penetrating horizontal hole is provided, one end of a streak is inserted and connected to each of the horizontal holes, and the other end is extended in a cantilever shape into a space inside the vertical portion of the foundation, and A high-strength and high-fluidity reinforcing concrete mixed with an organic or inorganic reinforcing fiber is coated in a region surrounded by a large number of the reinforcing bars to a structurally necessary height. It is characterized by being poured.

According to a fifth aspect of the present invention, as the reinforcing material,
It is characterized in that it is formed in a rod shape using any one selected from the group of continuous fibers such as reinforcing bars, carbon fibers, aramid fibers, and glass fibers.

According to each of the above-mentioned inventions, after the reinforcing concrete is hardened, the foundation and the reinforcing concrete are firmly connected to each other, and a solid structure similar to that of the solid foundation can be obtained. In addition, the high-strength reinforcing concrete mixed with reinforcing fibers can sufficiently support the increase in the load on the foundation due to an increase in the housing area, and has a high fluidity. Can flow into every corner inside the foundation of the building with good fluidity.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for reinforcing a building foundation and a foundation reinforcing structure according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a building foundation for describing a first embodiment of the present invention. In the present embodiment, a base 10 having an inverted T-shape roughly composed of a horizontal portion 10a and a vertical portion 10b and having a reinforcing bar 10d built therein is constructed, and the vertical portion 10b of the base 10 is formed. A large number of horizontal holes 10c are provided at predetermined intervals at predetermined inner positions.
Then, one end of a rod-shaped streak 14 shown in FIG. 3 is inserted and connected to each horizontal hole 10c, and is supported in a cantilever manner on the vertical portion 10b of the foundation. A high-strength and high-fluidity reinforcing concrete 15 mixed with reinforcing fibers is applied to the area surrounded by the foundation 10 so as to cover the reinforcing bars and to flow to a height necessary for the reinforcing structure. .

The details will be described below.
A hole is formed inside the vertical portion 10b of the “0” for inserting the streak 14. Processing is performed using a drill for concrete. Alternatively, holes are drilled using a short-height industrial robot. As shown in FIG. 2, the horizontal hole 10c is formed so as to be perpendicular to the vertical portion 10b of the foundation 10 and therefore horizontal. The diameter and the depth of the horizontal hole 10c are determined according to the streaks 14. The height position of the horizontal hole 10c is determined so as to be lower by a predetermined length than the surface of the reinforcing concrete 15 to be poured. FIG. 1 shows an example in which the reinforcing bar 15 is constructed so as to be arranged at a position of about の of the thickness of the reinforcing concrete 15. The number of the horizontal holes 10c, that is, the number of the reinforcing bars 14 inserted and fixed in the horizontal holes 10c is determined according to the required reinforcing strength of the reinforcing concrete 15.

Next, a streak 14 is inserted into the horizontal hole 10c.
Can be inserted and fixed using fixing means 18 such as an adhesive. When an adhesive is used, a synthetic resin adhesive is preferred because of its high adhesive strength, water resistance, heat resistance, durability, and chemical resistance. For example, there are vinyl resin-based, melamine resin-based, phenol-based, epoxy resin-based, cellulose-based, and furan resin-based adhesives. In addition, concrete can be used instead of the adhesive, and it may be physically fixed with a post-installed anchor.

In this embodiment, the piercing rod shown in FIG. The reinforcing rod is a deformed reinforcing bar 1 having a predetermined length with irregularities formed on the outer peripheral surface.
4b and a sleeve 14a fixed to one end of the reinforcing bar. By inserting a sleeve 14a into a horizontal hole 10c formed in the foundation 10, the streak 14 can be formed without using a fixing means such as an adhesive.
b can be fixed in a cantilever shape. This allows
Most of the deformed reinforcing bars 14 b of the splint 14 project substantially horizontally into the space surrounded by the foundation 10.

The boring process for inserting the bar 14 into the vertical portion 10b of the foundation 10 may be a bottomed shape.
4 can be inserted from the outdoor side to the indoor side in a penetrating manner. As a result, the work efficiency can be dramatically improved as compared with the underfloor work.

The operation procedure will be described below. In a preferred embodiment, as shown in FIG.
And a vertical portion 10b, and a foundation 10 having a reinforcing bar 10d built therein is constructed. A large number of horizontal holes 10c are provided at predetermined intervals at predetermined positions inside the vertical portion 10b of the foundation 10, and each of the horizontal holes 10c has a rod-shaped streak 1 shown in FIG.
4 is inserted and connected to the vertical portion 10b of the foundation in a cantilever manner.

Next, the reinforcing concrete is poured into the upper surface of the slab concrete 11, covered with the reinforcing rod 14, and cast into a structurally necessary height. The reinforcing concrete 15 according to the present embodiment is obtained by adding a fluidizing agent as an admixture to a high-strength concrete that has been previously kneaded and mixed, in order to increase fluidity without impairing strength durability. Use is made of fluidized concrete mixed with either organic or inorganic reinforcing fibers, for example, vinylon fibers. Concrete for reinforcement 15
Since it has a high fluidity, it can be poured into a predetermined thickness without forming gaps or voids over the whole, for example, by being poured from a ventilation notch 13 or the like provided in the foundation 10.

As a result of the above construction, the weight of the building is supported by the foundation 10 and the reinforcing concrete 15 firmly fixed to the foundation 10 via a number of reinforcing bars 14. It is to be noted that a single reinforcing structure in which only the reinforcing concrete 15 is poured into the slab concrete 11 without providing the reinforcing bars 14 on the foundation 10 may be used.

[0023]

According to the method and structure for reinforcing a building foundation according to the present invention, a large number of horizontal holes are provided at predetermined positions inside a vertical portion of the foundation at predetermined intervals, and one end of a reinforcing bar is inserted into each horizontal hole. Combined to support the vertical part of the foundation in a cantilever shape, and
After the reinforcing concrete is hardened, high-strength and high-fluidity reinforcing concrete mixed with reinforcing fibers is poured into the area surrounded by the foundation until the reinforcing concrete is covered. The foundation and the reinforcing concrete are firmly connected to each other, so that there is an effect that a solid structure similar to that of the solid foundation can be obtained.

Further, the reinforcing method and the reinforcing structure of the building foundation according to the present invention use a high-strength concrete in which reinforcing fibers are mixed in the reinforcing concrete used for the foundation structure. Thus, there is an effect that the increase in the load on the foundation due to the increase in the building area can be sufficiently supported. Further, the reinforcing concrete with high fluidity flows into every corner inside the foundation of the building with good fluidity, and has the effect of enabling the joint between the foundation and the reinforcing concrete without gaps.

From the above, according to the present invention, it is possible to increase the floor area such as making a one-story building such as a wooden house a two-story building and a two-story building a three-story building. Furthermore, since the supporting structure is the same as that of the solid foundation, it is possible to greatly improve the earthquake resistance against an earthquake.

[Brief description of the drawings]

FIG. 1 is a sectional view of a foundation after construction in a method for reinforcing a building foundation according to the present invention.

FIG. 2 is a perspective view of a foundation slab after a method of reinforcing a building foundation according to the present invention.

FIG. 3 is a front view of a reinforcing rod used in the method of reinforcing a building foundation according to the present invention.

FIG. 4 is a perspective view of the foundation after construction in the method for reinforcing a building foundation according to the present invention.

FIG. 5 is a sectional view of a conventional general building foundation.

FIG. 6 is a perspective view of a conventional general building foundation.

DESCRIPTION OF SYMBOLS 10 Foundation 10a Horizontal portion 10b Vertical portion 10c Horizontal hole 10d Reinforcing bar 11 Soil concrete 12 Gabushi 13 Notch portion 14 Reinforcing rod 14a Sleeve 14b Deformed bar 15 Reinforcement concrete 20 Base 21 Large pulling 22 joist 23 floorboard 24 floor 25 kasugai

Claims (5)

[Claims] 1. A foundation slab in which a reinforcing bar is embedded inside a horizontal portion which supports a building and a vertical portion which is integrally connected to the horizontal portion at right angles, is formed along a base at the bottom of the building. A method for reinforcing a building foundation that receives a ground reaction force against the weight of the building by being provided continuously, wherein a number of bottomed or penetrating horizontal parts are provided at predetermined positions inside a vertical portion of the foundation at predetermined intervals. Providing a hole, inserting and connecting one end of a reinforcing bar to each of the horizontal holes, and extending the other end side in a cantilever shape into a space inside a vertical portion of the foundation, and A high-strength, high-fluidity reinforcing concrete mixed with an organic or inorganic reinforcing fiber is coated in the enclosed area to cover a large number of the reinforcing bars, and is poured to a structurally necessary height. Characterized by comprising a process and Reinforcement method of building a basis for. 2. A reinforcing material, carbon fiber,
The method for reinforcing a building foundation according to claim 1, wherein the building foundation is formed in a rod shape using any one selected from a group of continuous fibers such as aramid fiber and glass fiber. 3. A foundation slab in which a reinforcing bar is embedded inside a horizontal part supporting a building and a vertical part integrally connected at a right angle to the horizontal part, along a base at the bottom of the building. A reinforcing structure of a building foundation that receives a ground reaction force against the weight of the building by being provided continuously, wherein an organic or inorganic reinforcing fiber is mixed in a region surrounded by the foundation. A reinforcing structure for a building foundation, characterized in that a high-strength and high-fluidity reinforcing concrete is covered with a large number of said reinforcing bars and poured into a structurally necessary height. 4. A foundation slab, in which a reinforcing bar is embedded inside a horizontal portion supporting a building and a vertical portion integrally connected to the horizontal portion at a right angle, is provided along a base at the bottom of the building. A reinforcing structure for a building foundation which receives a ground reaction force against the weight of the building by being provided continuously, wherein a number of bottomed or penetrating horizontal holes are provided at predetermined positions inside a vertical portion of the foundation at predetermined intervals. Is provided, one end of a streak is inserted and connected to each of the horizontal holes, and the other end is extended in a cantilever manner into a space inside the vertical portion of the foundation. A high-strength and high-fluidity reinforcing concrete mixed with a reinforcing fiber of either a system type or an inorganic type is covered with a large number of the reinforcing bars and poured into a structurally necessary height. Reinforcement structure of building foundation. 5. A reinforcing material, carbon fiber,
The building foundation according to any one of claims 3 to 4, wherein the building foundation is formed in a rod shape using any one selected from a group of continuous fibers such as aramid fiber and glass fiber. Reinforcement structure.