JPH0788658B2 - Soil column construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a soil column construction method of a mountain retaining structure provided so as not to affect adjacent land and a structure when a structure such as a building is rebuilt, The feature is that the soil, the destroyed underground structure, and the cement milk are sufficiently agitated and mixed, and further the soil columns are expanded to improve the water blocking performance.

[Conventional technology]

When rebuilding one of the structures such as adjacent buildings, it must be done so as not to affect the adjacent land and structures.

That is, especially when removing the underground structure of a rebuilt building, it is necessary to prevent the adjacent land from collapsing.

Conventionally, a sheet pile or H steel, etc. is continuously driven on the outside of the underground structure to be removed to form a temporary mountain clasp, and after being supported by a hypotenuse beam or a support work so that the temporary mountain clasp does not fall inward. The method of destroying and removing the underground structure inside of the structure and constructing the necessary mountain retaining at the removed portion and then removing the temporary mountain retaining has been adopted.

In the above method, a sheet pile or H steel, etc. is continuously driven into the outside of the underground structure to be removed to form a temporary mountain cleat, and it must be treated so that they do not fall inward. After the destruction and removal of the underground structure, the necessary mountain retaining structure had to be removed, which required time and labor, and was extremely uneconomical.

Therefore, the applicant of the present invention does not need to construct the temporary mountain clasp, that is, after removing the above-ground structure, leaving the underground structure as it is, piercing it with a drilling machine having a destructive capability for the underground structure, and placing a soil pillar and We provided a soil column construction method (Japanese Patent Application No. 61-305932) that forms a mountain clasp by connecting them.

[Problems to be solved by the invention]

The above-mentioned soil column construction method provided by the applicant of the present application does not need to form a temporary mountain cleat and is quick and economical,
Soil, destroyed underground structures and cement milk were only agitated by the auger head in the casing, and the soil columns were never constructed above the casing diameter.

The present invention eliminates the above-mentioned drawbacks by injecting cement milk at a high pressure in the horizontal direction of the casing and also in the obliquely downward direction of the lower end of the casing to sufficiently stir the soil and cement milk inside and outside the casing and The high-pressure jet in the direction forms a continuous wall having a width substantially thicker than the casing diameter, thereby enhancing the water blocking performance.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an auger head screw in the casing whose lower end is made of high-tensile steel and an auger head made of high-tensile steel located at the lower end, and the auger head is provided horizontally in the casing. Direction and a diagonally downward direction of the lower end of the casing are provided with a cement milk high-pressure injection port, the casing and the auger head are rotated in opposite directions, and further high-pressure injection of cement milk is carried out to a predetermined depth, and high-pressure injection is continued. In another embodiment, a stress material is then built in if necessary, and in another embodiment, the auger head is an enlarged auger head.

[Action]

In the present invention, a high-pressure injection port for cement milk is provided in the auger head located at the lower end of the casing in the horizontal direction in the casing and in the obliquely downward direction at the lower end of the casing. Then, at the time of perforation, the casing and the auger head are rotated in reverse to each other, and the high pressure injection of the cement milk is performed from each of the high pressure injection ports.

As a result, the cement milk injected at high pressure from the high-pressure injection port directed in the obliquely downward direction is ejected in a state in which a circle extending outward of the casing is drawn at the lower end of the casing as the auger head rotates.

In addition, the cement milk injected at high pressure from the high-pressure injection port of the auger head which is directed in the horizontal direction is horizontally rotated inside the casing as the auger head rotates.

That is, according to the present invention, the stirring and mixing are performed by the high pressure injection twice at the tip of the casing and inside the casing.

Furthermore, since the high-pressure injection of the cement milk directed in the obliquely downward direction spreads out to the lower end of the casing,
A soil column having a diameter substantially larger than the casing diameter is cast, a continuous wall having a width thicker than the casing diameter is formed, and water blocking performance is enhanced.

〔Example〕

An embodiment of the present invention will be described below. The auger head is shown in FIG.

That is, a casing (1) whose lower end is made of high-tensile steel
It is provided with an auger head (2) and an auger head (3) located at the lower end and made of high-strength steel. The auger head (3) is provided with high-pressure injection outlets (4) and (5) for cement milk directed horizontally and obliquely downward.

FIG. 2 is an auger head portion showing another embodiment, and an enlarged auger head (3a) is shown as an auger head. FIG. 3 shows a construction method of the present invention using the auger head portion.

In FIG. 3, (6) is a punching machine main body, which is provided with the casing (1), the auger head screw (2) inside the casing, and the auger head (3) at the lower end.

As described above, the lower end of the casing (1) and the auger head (3) are made of high-tensile steel, and the cutting edge is subjected to strong wear-resistant hardfacing to ensure good rotation and biting. Configured to destroy underground structures.

In the present invention, first, as shown in FIG. 3 (a), a ruler (7) made of H steel is installed at the mountain clasp construction position, and at the same time, a working ground for horizontally supporting the punching machine body (6) is constructed. Then, the casing (1) is installed vertically.

Next, the casing (1) of the auger head (3)
As shown in FIG. 3 (b), the cement milk is injected at a high pressure from the horizontal high-pressure injection port (4) and the high-pressure injection port (5) directed obliquely downward of the casing (1). Drilled to a predetermined depth.

At that time, according to the present invention, the underground structure can be drilled as it is, and the cement milk injected at high pressure from the high pressure injection port (5) directed obliquely downward at the lower end of the casing (1) has a lower end portion of the casing (1). In the above, the fuel is sprayed in a state of drawing a circle that spreads outward of the casing (1), and also penetrates into the soil on the outer side of the casing (1).

Next, the casing (1), the auger head screw (2), and the auger head (3) are pulled out while continuing the high-pressure injection of the cement milk, as shown in FIG. 3 (c).

After that, use a crane or punch machine body (6)
The casing (1) and the like are removed from the above, and H steel (8) as a stress material is hoisted up if necessary as shown in FIG. 3 (d), and the H steel (8) is built up by its own weight. Done.

Specifically, they are guided by an H steel (8) installation guide jig (9) provided by using the above ruler (7), and the H steel ( 8) will be built. Then, the H steel (8) is fixed at a predetermined position, and the soil pillar (10) is completed by solidifying the cement milk.

The soil pillars (10) are initially placed at appropriate intervals,
Waiting for the solidification thereof, the overlapping wall is sequentially piled up during that period to form a connecting wall as shown in FIG.

The dotted line portion (X) in FIG. 4 shows a continuous wall in the conventional soil column row construction method, and the solid line portion (Y) in FIG. 4 shows the continuous wall in the soil column row construction method of the present invention.

That is, according to the present invention, the diameter of the casing is conventionally wide, but the width is thicker than that, and the water stopping performance is enhanced by sufficient agitation and mixing by two high-pressure injections.

Further, if the enlarged auger head (3a) is used, the continuous wall can be further thickened.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, the soil, the destroyed underground structure, and the cement milk are fully agitated and mixed, the expansion of a soil pillar can be aimed at, and the soil pillar row | line which improved water-stopping property can be provided.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional view of an auger head portion, FIG. 2 is a vertical sectional view of an auger head portion showing another embodiment, and FIGS. (D) is a process diagram of the present invention, and FIG. 4 is a comparative diagram showing a state of driving a soil column. (1) …… Casing, (2) …… Auger head screw, (3) …… Auger head, (4) (5) …… Cement milk high-pressure jet.

Claims (3)

[Claims] 1. An auger head screw and an auger head made of high-tensile steel located at the lower end are provided in a casing whose lower end is made of high-tensile steel. A downward facing cement milk high-pressure injection port is installed, the casing and auger head are rotated in opposite directions, and further high pressure injection of cement milk is carried out to a predetermined depth, and further high pressure injection of cement milk is withdrawn. Soil column construction method characterized by. 2. The method of claim 1, wherein the stress material is built after the casing, the auger head screw and the auger head are pulled out. 3. The soil column row construction method according to claim 1, wherein the auger head is an enlarged auger head.