JP2002294722A - Foundation structure of structure and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure of a structure capable of cutting down an underground excavated amount and an outside conveyed soil amount to reduce a construction cost as well as the curtailment of a construction period and its construction method. SOLUTION: The foundation structure improves a soft ground on a bearing ground 2, the ground improved soil 3 is excavated to form a column section, a foundation beam and concrete casting parts 8 and 9 of a raft foundation bearing slab, and after reinforcing bars 11 and 12 constituted by combining a column reinforcing bar, the foundation beam 5 and every upper surface of the raft foundation bearing slab 7 with the concrete casting parts are arranged, concrete is monolithically cast to construct the foundation structure of the structure.

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 method of constructing the same, and more particularly, to a construction cost reduction and a construction period of a structure by reducing the amount of underground excavation and the amount of excavated soil during construction. The present invention relates to a basic structure of a structure for reducing the length of a building and a method of constructing the foundation.

[0002]

2. Description of the Related Art In the case of architectural structures, particularly low-rise structures, solid foundations are often used for construction on a ground having a low ground bearing capacity due to the light weight of the building.

As shown in FIG. 4, the structure of the solid foundation is generally such that a pressure-resistant plate 21 is provided on the supporting ground 2 in addition to the slab 20 on the lowermost floor. The structure is such that double slabs are provided above and below 22.

In order to avoid such a double slab structure, a slab type without a beam has been considered by flattening the foundation beam 24 as shown in FIG. The amount of excavation and the amount of soil carried out of the site will increase in large quantities, and will not stop environmental problems and the increase of waste,
It has been pointed out that a low-rise structure cannot reduce the cost of building a frame.

Further, construction of a solid foundation 25 as shown in FIG. 6 in which a slab is disposed only above the foundation beam in order to avoid a double slab structure has been studied. Disturbing the ground 28 below the plate causes a quality problem that it is difficult to secure a predetermined ground strength.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been proposed for the purpose of solving the problems and constructing a low-rise structure at low cost. It provides the foundation structure of structures and the method of construction that can reduce the construction cost and shorten the construction period by reducing the amount of unloaded soil.

[0007]

SUMMARY OF THE INVENTION A foundation structure of a structure according to the present invention is a ground improvement soil formed on a ground supporting a structure to be constructed and reaching a support ground, and a pillar portion of the structure in the ground improvement soil. It is composed of a foundation beam that connects the base beam and the column, and a base pressure-resistant version that is provided integrally with the foundation beam and the top end aligned, thereby ensuring the prescribed ground strength and excavating underground and unloading from the field. The construction time is shortened by reducing the amount of construction and the construction cost of the skeleton.

The method for constructing a foundation structure according to the present invention is a method for constructing a foundation structure of the above-mentioned structure, in which a soft ground on a supporting ground is ground-improved, and then a ground-improved soil is excavated to form a pillar portion and a foundation. Form the concrete casting part of the beam and solid foundation pressure-resistant version, and place the column reinforcement, the reinforcing beam of the foundation beam, and the reinforcing steel of the solid foundation pressure-resistant version with the top end coincident with the reinforcement of the foundation beam in the concrete placing part, After that, the foundation of the structure is being constructed by casting concrete into the concrete casting part, and the concrete is cast into the excavated surface of the ground improvement soil that defines the concrete casting part. It is characterized by the construction.

Accordingly, the method for constructing a foundation structure according to the present invention reduces the amount of underground excavation and the amount of excavated soil while reducing the amount of underground excavation and the amount of excavated soil while maintaining the ground strength of the ground at a predetermined value. In addition to addressing the environmental issues mentioned above, reducing the formwork on the side of the foundation beam and reducing the number of times of concrete placement has reduced the construction cost of the skeleton and shortened the construction period.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure of a structure according to the present invention is a ground improvement soil which is formed on a ground supporting a structure to be constructed and reaches a support ground. It is composed of a foundation beam connecting the parts and a basic pressure-resistant plate provided integrally with the foundation beam and the top end in alignment with each other, and the structure is simplified while ensuring a predetermined ground strength.

An embodiment of the basic structure of a structure according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a basic structure of a structure according to the present invention, and is a plan view (a) of the lowest floor and a side view (b) showing only the form of the lowest floor.

The foundation 1 of the building in this embodiment is:
It is constructed in the ground improvement soil 3 formed on the support ground 2.

As shown in the figure, the area of the ground improvement soil 3 is enlarged from the outer periphery of the foundation beam to an extent corresponding to one half of the foundation beam, and the soft ground below the ground surface reaching the support ground is removed from the ground. Has improved.

As shown in FIG. 1 (a), the foundation 1 has a foundation beam 5 disposed around the periphery connecting the columns 4 together with a basic pressure-resistant plate 7 in which predetermined small beams 6 are appropriately arranged. Have been built.

Therefore, in the side view shown in FIG. 1 (b), the foundation beam 5 of the building and the top end coincide with each other in the ground improvement soil 3 formed on the support ground 2 as shown. The solid foundation pressure resistant version 7 is displayed, and the vertical load of the building and the horizontal force due to earthquakes and the like are obtained by the ground improvement soil 3, the foundation beam 5, and the solid basic pressure resistant version 7 that exhibit the same ground strength as the supporting ground 2. It is definitely supported.

The details of the ground improvement soil 3, the foundation beam 5, and the solid foundation pressure-resistant plate 7 are shown in a partially enlarged view of FIG. It is formed larger than the line.

The foundation beams 5 and the solid foundation pressure-resistant plate 7 are formed in the ground-improved soil 3 and the surface thereof so that the top ends thereof are flush with each other, so that the ground-improved soil exerts a required ground strength. 3 and is constructed without disturbing the ground immediately below the pressure-resistant plate and the surrounding ground.

In the present embodiment, a concrete form is placed on the side surface of the foundation beam 5 and concrete is cast. However, as will be described later, this form can be omitted according to the situation. In this case, the shapes of the foundation beam 5 and the solid foundation pressure-resistant plate 7 also differ from those shown in the figure.

As described above, the foundation structure of the structure according to the present invention is constructed integrally with the ground improvement soil, the foundation beam and the solid foundation pressure-resistant plate, and therefore, compared with the double slab type solid foundation. The amount of ground excavation is reduced while securing the desired bearing strength, the amount of soil carried out of the site is greatly reduced, and the amount of concrete used is also reduced, significantly reducing the construction cost and construction period of the foundation. Has been reduced.

Next, a method of constructing the foundation structure of the above-described structure will be described in detail. The method of constructing a foundation structure according to the present invention comprises improving the ground on the soft ground on the supporting ground, and then excavating the ground improvement soil to form a column and a foundation beam and a concrete casting portion of a solid foundation pressure-resistant plate. It is composed by placing a column reinforcing bar, a reinforcing bar of a foundation beam, and a reinforcing bar of a solid pressure-resistant version of the foundation beam in which the top end matches the reinforcing bar of the foundation beam, and then concrete is integrally poured into the concrete placing portion. are doing.

Hereinafter, embodiments of the basic structure of a structure according to the present invention will be described in detail with reference to the drawings.

FIG. 3 shows the construction method according to the present invention in the order of steps. FIG. 3A shows a construction process of the ground improvement soil 3, in which the soft ground on the support ground 2 is ground improved by a predetermined construction method.

The construction area of the ground improvement soil 3 is merely expanded to an extent corresponding to one half of the foundation beam from the outline of the foundation beam, and the underground excavation amount and the unloading are carried out without disturbing the surrounding ground. The amount of soil is reduced to avoid environmental problems such as waste measures.

FIG. 3 (b) shows a process of excavating the ground improvement soil to form a working position of the column, the foundation beam and the solid foundation pressure-resistant plate.

In this step, in order to form the column, the foundation beam, and the solid foundation pressure-resistant plate in the ground improvement soil 3,
Predetermined excavation work is performed.

The excavation work is carried out carefully so as not to disturb the ground after the improvement, and the plane excavation of the arrangement portion 8 of the solid foundation pressure-resistant plate and the trench excavation of the arrangement portion 9 of the foundation beam are performed. .

FIG. 3 (c) shows a process of measuring the ground strength of the ground improvement soil after excavation. The ground improvement soil 3 of the present embodiment is a ground improvement of a soft ground on the support ground 2 by a shallow-layer mixing method using a cement-based solidifying material.

The compounding condition of the solidified material is determined in consideration of the soil condition of the soft ground soil and the construction condition, and the predetermined uniaxial compressive strength (N /
m ² ), the amount of solidification material added is selected, but before moving on to the next step, the solid base pressure-resistant plate arrangement part 8
A flat plate loading test 10 is performed in order to confirm the ground strength at the time.

After confirming that the ground improvement soil 3 after excavation has exhibited a predetermined ground strength, as shown in FIG. Has been constructed.

The reinforcing bars 11 of the foundation beams and the reinforcing bars 12 of the solid foundation pressure-resistant version are constructed simultaneously with the reinforcing bars 13 of the columns. Reinforcing bars are arranged so that the top ends coincide with each other.

FIG. 3 (e) shows a step of placing concrete on a foundation beam and a solid foundation pressure-resistant plate.

FIG. 4 shows a conventional method of placing concrete.
As shown in the example shown in FIG. 1, the formwork was individually arranged on the reinforcing bar 11 of the foundation beam and the reinforcing bar 12 of the solid pressure-resistant version, and then each concrete was cast, but in the present embodiment,
The formwork below the side of the foundation beam and the solid foundation pressure-resistant version is omitted.

The concrete placement according to the present embodiment is carried out in such a manner that the reinforcing bars 11 of the foundation beams and the reinforcing bars 12 of the solid foundation pressure-resistant plate are in a coincident state in which both top ends coincide as described above. The casting of concrete on the foundation beam and the solid pressure-resistant version of the foundation was carried out one time by casting and the concrete casting process was completed.

Since the method for constructing a foundation structure according to the present invention is constructed as described above, the amount of underground excavation and the amount of unloaded soil are reduced while maintaining the ground strength of the ground at a predetermined value. In addition to reducing environmental impacts such as waste countermeasures and reducing the number of concrete castings on the side of the foundation beams, the construction cost can be reduced and the construction period can be shortened. It is.

Although the present invention has been described in detail based on the embodiments, the basic structure of the structure according to the present invention and the method of constructing the structure are not limited to the above-described embodiments, and An application shall be made within the scope of the present invention in which a ground improvement soil is formed on the ground in the area where the construction is to be carried out, and a foundation beam and a solid base pressure-resistant version are installed in the ground improvement soil while matching the top ends of each other. It goes without saying that various modifications can be made by applying a known device at times.

[0037]

The foundation structure of a structure according to the present invention is a ground improvement soil which is formed on a ground supporting a structure to be constructed and reaches a supporting ground, a pillar portion of a structure in the ground improvement soil and the pillar It is composed of a foundation beam connecting the parts and a solid foundation pressure-resistant version provided integrally with the foundation beam and the top end in line with each other. This has the effect of reducing the construction cost of the skeleton and shortening the construction period.

The method for constructing a foundation structure according to the present invention is a method for constructing a foundation structure of the above-mentioned structure, in which a soft ground on a supporting ground is ground-improved, and then a soil-improved soil is excavated to form a pillar portion and a foundation. Form the concrete cast part of the beam and solid foundation pressure-resistant version, and place the column reinforcement, the reinforcement of the foundation beam, and the reinforcing steel of the solid foundation pressure-resistant version with the top end matched with the reinforcement of the foundation beam in the concrete poured part, After that, the foundation structure of the structure is being constructed by casting concrete integrally into the concrete casting part, and at the same time, the concrete casting is carried out by excavating the ground improvement soil that defines the concrete casting part. Since it is characterized by being constructed in a formwork, the following effects are exhibited.

The ground strength of the ground improvement soil can be secured to a predetermined value. The amount of underground excavation and the amount of excavated soil can be reduced to avoid environmental problems such as waste management. The formwork on the side of the foundation beam can be reduced, the number of concrete castings can be reduced, the construction cost of the skeleton can be reduced, and the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a plan sectional view (a) and a side view (b) showing a basic structure of a structure according to the present invention.

FIG. 2 is a partially enlarged view of a basic structure of a structure according to the present invention.

FIG. 3 is a construction process diagram showing a construction method of a foundation structure according to the present invention.

FIG. 4 is a diagram of a conventional solid basic structure.

FIG. 5 is a diagram showing another conventional solid basic structure.

FIG. 6 is a diagram showing another conventional solid basic structure.

[Explanation of symbols]

1 foundation, 2 supporting ground, 3 ground improvement soil, 4
Pillars, 5 foundation beams, 6 small beams, 7 solid pressure-resistant version,
8 Placement of solid foundation pressure-resistant version, 9 Placement of foundation beam, 10 Plate loading test, 11 Reinforcement of foundation beam, 1
2 Reinforcement of solid basic pressure-resistant version, 13 pillar reinforcement, 20,
27 slab on the lowest floor, 21 pressure-resistant version, 22, 24,
26 foundation beam, 23, 25 foundation, 28 ground,

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomoyuki Maeba 2-2-2, Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka F term (reference) 2D040 AB03 AC05 BB03 BD00 CA01 2D046 BA00

Claims (3)

[Claims] 1. A ground improvement soil formed on a ground supporting a structure to be constructed and reaching a support ground, a foundation beam connecting a column of a structure to the pillar in the ground improvement soil, and the foundation beam The basic structure of a structure composed of a solid pressure-resistant version that is provided integrally with the top and the top aligned. 2. Improving the soft ground on the supporting ground, then excavating the ground improvement soil to form a column, a foundation beam, and a concrete foundation for the solid foundation pressure-resistant plate. The column reinforcing bar, the reinforcing bar of the foundation beam and the reinforcing bar of the solid foundation pressure-resistant version with the top and bottom of the reinforcing beam of the foundation beam aligned,
2. The method according to claim 1, further comprising the step of casting concrete integrally into the concrete casting portion. 3. The method according to claim 2, wherein the concrete is cast by using an excavated surface of the ground improvement soil that defines the concrete cast portion as a formwork.