JP3410716B2 - Ground drilling method - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for boring ground,
In particular, it relates to a method of drilling a ground for constructing a continuous wall for water stoppage and mountain retention in civil engineering work.

[0002]

2. Description of the Related Art Conventionally, as a construction method for constructing continuous walls for waterproofing and mountain retention, the ground is drilled and drilled by an auger that rotates while discharging a hardening liquid containing cement or the like. The ground soil and the hardening liquid are mixed by the rotation of an auger, the continuous wall forming material composed of these mixtures is filled in the drilled portion, and these operations are repeated thereafter while shifting the drilled position. The method is known. By excavating the inner region surrounded by the continuous wall made of the continuous wall building material to a predetermined depth, a working space below the ground surface, the periphery of which is protected by the continuous wall, is formed.

[0003]

In the above-mentioned conventional method, the hardening liquid discharged from the auger is, for example, one containing cement, bentonite and water. This hardening liquid not only mixes with the ground soil at the drilling location, but also penetrates into the soil around the drilling location. Of the earth and sand around the drilled area where the hardening liquid has entered in this way, the earth and sand located in the area surrounded by the continuous wall is excavated together with the earth and sand that has not entered the hardening liquid to form a working space. . However, excavated earth and sand containing hardening liquid (earth and sand containing mortar component hardened by hydration of cement) is not suitable for use as backfill soil and must be disposed of as waste. .

However, the earth and sand containing the hardening liquid (earth and sand to be disposed of as waste) and the earth and sand containing no hardening liquid (earth and sand that can be used as backfill soil) have almost the same color, and should be visually distinguished. Is difficult. Therefore, after excavating a portion surrounded by a continuous wall and collecting the excavated soil, when the excavated soil is divided into the above two types of sediment, the sorting work is complicated and the sorting itself is inaccurate. There is a problem that it is easy to become.

The present invention is intended to solve the above problems in the prior art, and is suitable for backfilling when the earth and sand produced by excavating the area surrounded by the continuous wall is used as backfilling soil. It is possible to easily distinguish between the earth and sand (earth and sand containing no hardening liquid) and the earth and sand to be disposed of as waste (earth and sand containing hardening liquid), and the separation work of these two types of earth and sand can be performed quickly and accurately. It is intended to provide a ground drilling method like this.

[0006]

Means for Solving the Problems As a result of studies for solving the above-mentioned problems, the present inventor has found that if the hardening liquid used as a material for the continuous wall is colored, the sand and sand in which the hardening liquid has penetrated (disposal To be easily identified,
As a result, we came up with the idea that we can quickly and accurately separate the soil that should be disposed of and the soil that can be backfilled.
The present invention has been completed.

That is, the method for boring ground according to claim 1 of the present invention is a method for hardening liquid (for example, cement, bentonite,
An auger that rotates while discharging water mixed with a predetermined mixing ratio (specifically, a screw for drilling the ground is formed at the tip, and for supplying the above-mentioned hardening liquid) A pipe line is provided inside and the discharge port of the above-mentioned hardening liquid is provided near the tip),
Along with drilling the ground, the ground soil produced in the drilling and the hardening liquid are mixed by the rotation of the auger, and the continuous wall forming material composed of these mixtures is drilled at the location where the auger screw has passed. In the method of boring the ground for filling the (columnar portion of the inside), since the curing liquid is colored , the soil in which the curing liquid to be disposed of as waste is infiltrated.
It is characterized in that sand is identified and collected by color .

According to this structure, when the hardening liquid enters the earth and sand around the drilled portion, the area where the hardening liquid enters is colored with the color of the hardening liquid. For this reason, when excavating a region on one side of a continuous wall (region where a working space is formed) formed by continuously piercing a portion (a portion filled with a continuous wall forming material), it is excavated. Whether or not the earth and sand contain a hardening liquid can be easily judged by looking at the color of the earth and sand. Therefore, it is possible to quickly and accurately perform the work of discarding the sediment containing the hardening liquid, distinguishing it from the soil that can be backfilled, and discarding it.

Here, as an example of the above-mentioned hardening liquid, one containing color cement (specifically, white cement, white cement mixed with various pigments, etc.) can be mentioned (claim 2).

Other examples of the above-mentioned curing liquid include those containing a pigment (specifically, red iron oxide for red, ultramarine blue for blue, titanium oxide for white, carbon black for black, etc.). Claim 3).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a state in which the ground is drilled and filled with a continuous wall forming material ((a) in the figure),
FIG. 2 is a view showing a state ((b) in the figure) in which a working space is formed by excavating one side of the filled continuous wall forming material. FIG. 2 shows the positions of the drill holes for forming the continuous wall. It is a figure for explaining the order which shifts.

As shown in FIG. 1A, a mobile crane 1
A leader 3 is suspended from the upper end of the boom 2. The drive device 4 is mounted on the reader 3 so as to be movable in the vertical direction (vertical direction) along the reader 3. The auger 5 is disposed so as to hang down from the drive device 4, and is configured to move as the drive device 4 moves in the vertical direction. Further, a pipe line (hollow part) extending in the longitudinal direction is provided inside the auger 5, and the curing liquid in this pipe flows downward and is discharged from the curing liquid discharge port near the lower end of the auger 5. It is supposed to be done. In order to prevent the auger 5 from swinging in the horizontal direction, a guide portion 6 that slidably penetrates the auger 5 is provided below the reader 3.

For drilling, first, the lower end of the auger 5 is aligned with a predetermined point on the ground 7, and then the auger 5 is moved.
Is gradually moved downward while rotating, and the ground 7 is drilled by the screw 5a of the auger 5. The hardening liquid is discharged from the hardening liquid discharge port provided near the tip of the screw 5a of the auger 5. This hardening liquid is mixed with the ground soil generated in the drilling holes of the ground 7 by the rotating action of the screw 5a having spiral blades. The continuous wall building material 8 consisting of the hardening liquid and ground soil produced by mixing,
After the auger 5 is pulled out from the ground, the holed portion (columnar portion through which the screw 5a of the auger 5 has passed) remains filled.

Here, as the hardening liquid, for example, one prepared by mixing cement, bentonite, and water in an appropriate mixing ratio is used. Cement has a function as a hardening material that gives strength and rigidity to a continuous wall, and bentonite is
It mainly functions as a water blocking material that fills voids in the continuous wall by swelling due to water absorption. The mixing ratio of the curing liquid is
Usually, when the soil is clay, 300-450 cement
kg, bentonite 5-15 kg, water 450-900 liters, in case of sandy soil 200-400 kg cement, bentonite 5-20 kg, water 300-800 liters, in case of gravel soil cement 200-400 kg , Bentonite 5 ~ 30kg, water 300
~ 800 liters.

The hardening liquid is colored in a color that is easily distinguishable from the color of the earth and sand. To color the curing liquid, for example, a method of using color cement as cement, a method of incorporating a pigment in the curing liquid, and the like can be mentioned.

As the color cement, white cement or a mixture of white cement and a pigment for color cement described later is used. It should be noted that white cement is iron oxide (II
I) (Fe ₂ O ₃ ) content (3-4% for ordinary cement)
This is a cement that has been adjusted to 0.3% or less.

Examples of pigments include red, blue, and
Various pigments for color cement such as yellow, green, purple, black and white are used. Specifically, red color is used for red iron oxide, synthetic iron oxide (Fe ₂ O ₃ ), and blue color is used for ultramarine blue (2 (Al ₂ Na ₂ Si ₃ O ₁₀ ) ・ NaSO ₄ ), cobalt (CoO. nAl ₂ O ₃ ) etc. are used for yellow, and blue synthetic iron oxide (F
e ₂ O ₃ · H ₂ O) etc., for the green color, chromium oxide (Cr ₂ O ₃ )
Cobalt (Co ₃ (PO ₄ ) ₂ ) and purple iron oxide (Fe ₂ O ₃ ) for purple, carbon black (C), synthetic iron oxide (Fe ₂ O ₃ · FeO) for black. ) And the like, titanium oxide (TiO ₂ ) and the like can be used for white. As the pigment, an aqueous pigment (aqueous colorant) other than the pigment for color cement may be used. The amount of the pigment blended is not particularly limited as long as it can distinguish the color of the soil containing the curing liquid from the color of the soil not containing the curing liquid.

As shown in FIG. 1 (a), after the continuous wall forming material is filled into the drilled holes in the ground in a columnar shape, the drilling work is repeated so that the drilled holes are continuously connected. .
The work procedure at this time is shown in FIG. FIG. 2 shows an example of a drilling procedure for drilling when the driving device 4 is provided with three augers 5 in parallel. The three augers 5 are juxtaposed so that their rotation loci partially overlap and their screws do not collide with each other. By mounting a plurality of augers in this manner, the drilling work can be efficiently performed.

In this case, first, as shown in FIG. 2 (a) as a horizontal sectional view, the boring portions 10, 11, 12 in which the continuous wall forming material 8 is filled with three augers 5.
To form. Next, the three augers 5 are cut into the drilled portion 1
In the direction on the extension line connecting the respective center points of 0, 11, and 12, a distance equivalent to four times the interval (pitch) between the augers is moved, and the holes are drilled again to form the drilled parts 13, 14, 1
5 is formed ((b) in FIG. 2). Next, the three augers 5 are moved in the opposite direction to the previous one by a distance corresponding to twice the interval (pitch) between the augers to carry out drilling to form the drilled portions 12, 16 and 13. ((C) in FIG. 2).
Note that the drilled portions 12 and 13 are drilled in duplicate. After that, when H steels 17 and 18 having an H-shaped cross section are driven into each of the drilled portions 12 and 13, a continuous wall 20 reinforced with the H steel is formed. In addition, H steel 1
Nos. 7 and 18 are used for mountain retaining to withstand the stress received from earth and sand.

After the continuous wall 20 is hardened, as shown in FIG. 1B, a region surrounded by the continuous wall 20 (the right side portion of the continuous wall 20 in FIG. 1) is excavated to a predetermined depth. The ground 21 is formed. A portion surrounded by the ground 21 and the continuous wall 20 is a work space.

Of the excavated earth and sand, the earth and sand in the vicinity of the continuous wall 20 is not suitable for use as backfill soil because it contains mortar components derived from the hardening liquid and the like, and must be disposed of. is there. In the present invention, since the earth and sand unsuitable as the backfill soil is colored by the color of the hardening liquid, it can be easily distinguished from the earth and sand usable as the backfill soil. Therefore, the work of separating the earth and sand suitable for backfilling from the earth and sand not suitable for backfilling can be performed quickly and accurately.

[0022]

According to the boring method of the present invention, the earth and sand generated by excavating the earth and sand surrounded by the continuous wall for water stop and mountain retaining,
When used as backfill soil, the earth and sand to be disposed of as waste (earth and sand containing mortar components derived from the hardening liquid) can be easily identified and recovered from the excavated earth and sand.

Further, since the wall surface itself is colored, if there is water leakage during or after excavation, it can be easily determined. Furthermore, the degree of weathering after excavation will be easier to understand.

[Brief description of drawings]

FIG. 1 shows a state in which the ground is drilled and filled with a continuous wall building material (a), and a state in which a working space is formed by excavating one side of the filled continuous wall building material (b). FIG.

FIG. 2 is a diagram for explaining the order of shifting the positions of drilling holes for forming a continuous wall.

[Explanation of symbols]

1 Crane Truck 2 Boom 3 Leader 4 Drive 5 Auger 5a Screw 6 Guide 7 Ground 8 Continuous Wall Construction Material 10, 11, 12, 13, 13, 14, 15, 16 Drilled Hole 17, 18 H Steel 20 Continuous Wall 21 Ground

Claims (3)

(57) [Claims] 1. A ground wall is drilled by an auger that rotates while ejecting a hardening liquid, and ground soil produced by drilling is mixed with the hardening liquid by the rotation of the auger, and a continuous wall made of a mixture of these materials is mixed. In the method of drilling the ground in which the building material is filled in the drilled locations, the hardening liquid to be disposed as waste is colored because the hardening liquid is colored.
A method for boring ground, characterized in that invaded sediment is identified by color and collected . 2. The method for boring ground according to claim 1, wherein the hardening liquid contains color cement. 3. The method for boring ground according to claim 1, wherein the hardening liquid contains a pigment.