JPS6049735B2 - How to form a basement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a basement, which is useful, for example, when applied to soft ground.

Basically, a basement is formed by excavating the ground and forming it within the excavated recess. However, in soft ground, there is a high possibility that the walls of the excavated recess will collapse during construction, so it is necessary to use sheet piles for shoring. Countermeasures had to be taken, making construction costs extremely high.

The present invention is based on the idea that before excavating the ground, a row of pillars defining a basement to be formed in the ground is formed, and then the inside of the row of pillars is dug to form the basement. Each column constituting the above-mentioned column row is formed by excavating a columnar hole with an excavator agitator, stirring the internal ± sand, and at the same time injecting a soil hardening agent. It is characterized by the fact that the units are fitted into it and form the foundation of the building.

The method of the present invention will be explained below with reference to the drawings.

Assuming that a basement is to be formed in a rectangular part 1 surrounded by a straight line A in FIG. There are ways to form. Each column 2 constituting the column row B is constructed as shown in FIG. 2 using an excavating agitator such as an O-force. The excavation agitator 3 has a pair of excavation agitators 5 that are rotationally driven by a drive mechanism 4, and has a blade 6 at the tip of the shaft 5.
is provided.

Further, a pressure feed pipe 7 is arranged between the pair of shafts 5 and parallel to the shafts 5, and the pressure feed pipe 7 is connected to a discharge nozzle (not shown) at the tip of the stirring shaft 5 via a swivel joint. ±
It is configured to supply a soil hardening agent. When the rotationally driven excavation agitator 5 is lowered to the ground 3,
A columnar hole 8 is bored in the ground, and at the same time, earth and sand 9 in the columnar hole 8 are stirred by the shaft 5. When the depth of the columnar hole 8 reaches the required depth, the excavation agitator 5 is raised and pulled out from the hole. A soil hardening agent is injected and mixed into the earth and sand 9 through the discharge nozzle.

Since the excavation stirring shaft 5 stirs the earth and sand, the earth and sand and the soil hardening agent are well mixed and kneaded, and the strength of the column 2, which is naturally hardened later, becomes uniform and strong.

Since the excavation agitator 3 is equipped with a pair of agitation shafts 5,
Two columns 2 are constructed at the same time, and both columns 2 partially overlap.

Then, before this column 2 is cured, the next column 2 to be formed in the same manner is formed so as to partially overlap the already formed adjacent column. In this way, a continuous column row B is formed on the outer periphery of the rectangular portion 1.

Soil hardening agents with various components and properties are commercially available, and one may be selected from these to suit the properties of the soil.

Examples of this soil hardening agent include NO. l (Seijei CaO6
7.8% by weight, SiO2l 5.2% by weight, Al2O3l
l. 4% by weight, 2.5% by weight of MgO, 3.1% by weight of others), NO. 2 (components CaO6O.l wt%, SlO2
l6. % by weight, SO3l2. 1% by weight, Al2O28
．． 4% by weight, 2.4% by weight of Fe2O, 0.9% by weight of others), NO. 3 (component K2CO33O.O weight%, N
aCI2O. O wt%, Na2CO32O. O weight%,
Al2O35. O weight%, MgO5. O weight%, others 20. %) can be used, and an appropriate amount of water is added to this and mixed with soil and kneaded. The mixing ratio of the soil hardening agent is 5 to 20% by weight depending on the soil quality in order to achieve a compressive strength comparable to that of concrete. After the pillar row B formed in the ground as described above has hardened naturally, the ground surrounded by the pillar row B is excavated as shown in FIG. 3B.

During this digging, the columns B prevent the ground from collapsing, so the work can be done quickly and reliably. After digging the roots, concrete is placed at the bottom of the excavation as necessary, and a mixture of earth and sand and soil hardening agent is filled and compacted to form the basement foundation 1.
0 (Figure 3C).

The basement is formed in a recess surrounded by the column row B and the basement foundation 10 formed as described above.

To construct this basement, we will use a basement unit manufactured separately at a factory to shorten the construction period. That is, a cubic basement unit 11 matching the shape of the rectangular portion 1 is produced in a factory, lifted by a crane, and fitted into the dug-out recess as shown in FIG. 3D. Then, the basement construction work is completed by filling the gap between the basement unit 11 and the column row B with a mixture of earth and sand and a soil hardening agent or concrete and fixing the basement unit 11.

The above-ground building may be built on the foundation after forming the foundation on top of or on the outer periphery of the basement unit 11. The method of the invention can be further developed as shown in FIG. In this embodiment, all or part of the earth and sand excavated by root digging in the column row B is mixed with a soil hardening agent, and the mixture is piled and compacted around the basement unit 11 to form a building. This is what formed the foundation 12. According to this embodiment, the depth of digging in the ground can be reduced by the thickness of the foundation 12, and the advantage is that the foundation can be quickly formed using the soil removed by digging. . Furthermore, if a hot water storage vibrator 15 that stores hot water heated by the solar water heater 14 or other water heater on the building 13 is buried in the foundation 12, the high heat retention effect in the soil can be utilized. can. The hot water in the hot water storage vibrator 15 is configured so that it can be appropriately supplied to required locations within the building 13 by a pump 16. In summary, the method of the present invention involves forming columnar rows surrounding a basement to be formed in the ground, and each columnar row is excavated by an excavating agitator while stirring the internal soil, and at the same time hardening the soil. It is formed by injecting a chemical agent, and since adjacent columns partially overlap each other, it is possible to reliably obtain a solid and continuous row of columns even if the ground is soft.

Since the ground for the basement to be formed is excavated after the columns have hardened, there is no risk of the surrounding area collapsing. Therefore, the excavation work and the construction of the basement within the excavation recess are quick and easy. It can be done safely and reliably.
Since the basement unit is fitted into the recessed area, not only can the construction period be further shortened, but the basement unit is protected by the underground walls made of pillars and the basement foundation. Because of this, it will not shift or be damaged due to earth pressure or ground subsidence, and will not be destroyed by earthquakes, making it extremely strong.

In addition, since the foundation of the building is formed around the basement unit using a mixture of soil and soil hardening agent excavated by root digging, the soil and sand excavated by root digging can be used effectively. The trouble of forming the foundation can be sufficiently eliminated.

[Brief Description of the Drawings] Fig. 1 is a partially enlarged plan view showing an example of the basement and column rows to be formed, Fig. 2 is a sectional view showing an example of the formation process of each column, Fig. 3 A, B, C, and D are cross-sectional views showing the process of forming a basement after column rows are formed, and FIG. 4 is a cross-sectional view of a building formed using the method of the present invention. B... Column row, 2... Column, 3...
...Drilling agitator, 5...Drilling agitation shaft, 6...
... Wing piece, 7 ... Pressure pipe, 8 ...
Column hole, 9... Earth and sand, 10... Basement foundation, 11... Basement unit, 12...
Building foundation, 15...Hot water storage vibe.

Claims (1)

[Claims] 1 A columnar hole is excavated using an excavation agitator while stirring the soil inside, and at the same time a soil hardening agent is injected to form a column in the ground, and the column is made so that adjacent columns partially overlap each other. After this column has hardened, the ground surrounded by the column is dug. A separately formed basement unit is fitted into the recess formed by forming the basement foundation at the bottom to form a basement, and a mixture of earth and sand excavated by root digging and a soil hardening agent is piled and compacted around the basement unit. A method for forming a basement, characterized in that the foundation of a building is formed using