JP2002061177A - Method of manufacturing wet columnar body for dwelling house foundation ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a wet columnar body for further facilitating the support of the load of a building even when the lower end of the columnar body does not arrive at a rock mass layer by forming an annular protrusion on the columnar body for giving greater friction force between the columnar body and a soil in a ground. SOLUTION: A drilling cutter and liquid solidifying material supply means are provided at the end of a rod and a drilling mechanism for drilling in the radial direction during reverse rotation while reducing its diameter during positive rotation of the rod and increasing its diameter during reverse rotation is provided on the rod right above the drilling cutter. The rod is positively rotated to excavate a ground surface down to a predetermined depth using the drilling cutter while discharging a liquid solidifying material using the liquid solidifying material supply means and the rod is reversely rotated at a desired depth to partly increase a drilling diameter in the ground or on the ground surface using the drilling mechanism, whereby the columnar body with the annular protrusion is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wet pillar on a foundation ground of a relatively small house among buildings.

[0002]

2. Description of the Related Art If the underground rock layer is relatively shallow, about several meters from the surface of the ground, there is no problem because the lower end of the columnar body of the foundation ground can be brought into contact with the rock layer. In places where it is not possible to reach the bedrock unless it is dug deep enough, the load of the building must be supported only by the frictional force between the soil and the column.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention provides an annular projection formed on a columnar body to increase the frictional force between the columnar body and the soil under the ground so that the lower end of the columnar body reaches the bedrock layer. It is an object of the present invention to provide a method of manufacturing a wet columnar body that can easily support the load of a building even if it is not performed.

[0004]

According to the present invention, an excavating blade and a liquid solidifying material supply means are provided at the tip of a rod, and the diameter of the rod is reduced when the rod rotates forward and the diameter is expanded when the rod rotates reversely. An excavation mechanism for excavating in the radial direction at the time of reverse rotation is provided immediately above the excavation blade of the rod, and the rod is rotated forward to discharge the liquid solidified material by the liquid solidified material supply means, and the ground is excavated by the excavation blade. Digging down to a predetermined depth, rotating the rod in the reverse direction at a desired depth, and partially expanding the excavation diameter in the ground or on the ground by the excavation mechanism to form a columnar body having an annular projection. I made it.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic side view of a column manufacturing apparatus 100 for carrying out a method for manufacturing a wet column according to the present invention. The columnar body manufacturing apparatus 100 includes:
The vehicle 5 includes a column 5 supported by the arms 21 and 22 of the working vehicle 20, a rod fixed to the column 5 via a motor 23, an excavator 4 fixed to a lower end of the rod 1, and the like.

Above the excavator 4 of the rod 1, an enlarged excavator 3 and a stirring blade 2, which will be described in detail later, are integrally fixed to the rod 1. The rod 1 can be rotated forward and backward by a motor 23.

FIG. 5 shows the rod 1 when the rod 1 rotates forward.
6 is a schematic side view of the tip portion of FIG. 6, and FIG. 6 is a view taken along the line VI-VI in FIG. 7 is a schematic side view of the tip of the rod 1 when the rod 1 rotates in the reverse direction, and FIG.
It is an arrow view. However, in FIG. 6 and FIG. 8, the illustration of the soil 8 mixed with the liquid solidifying material is omitted.

As shown in FIG. 5, the excavator 4 has a plurality of excavating blades 4a, and can excavate the hole 7 (FIGS. 2 and 6) when the rod 1 rotates forward. The large-diameter excavator 3
An enlarged diameter excavating blade 16 is rotatably connected to a fixed portion 3 a fixed to the rod 1 by a pin 15. The agitating blade 2 is configured to stir the liquid solidified material-mixed soil 8 (FIG. 2) described later when the rod 1 rotates.
It is fixed at an angle.

The rod 1 is hollow, and a liquid solidifying material supply passage 6 is provided in the rod 1. The lower end of the rod 1 is provided with a discharge port 6a for discharging a liquid solidifying material (cement milk). The liquid solidified material can be discharged from the discharge port 6a from the liquid solidified material supply device 25 via the liquid solidified material supply passage 6.

As shown in FIG. 6, when the rod 1 rotates forward, the position of the center of gravity G of the large-diameter excavating blade 16 of the large-diameter excavator 3 in the rotational direction (progressing direction) is indicated by an arrow with respect to the rotational direction (progressing direction). ) Is located rearward of the position of the pin 15, the enlarged diameter excavating blade 16 rotates about the pin 15 and
, The diameter of the large-diameter excavator 3 is reduced. Therefore, during the forward rotation of the rod 1, the enlarged diameter excavation blade 16 cannot enlarge the diameter w _{1 of the} hole 7 (perform the enlarged diameter excavation).

However, when the rod 1 rotates in the reverse direction, the center of gravity G of the enlarged digging blade 16 comes forward of the pin 15 in the traveling direction, so that the enlarged digging blade 16 rotates about the pin 15 as shown in FIG. The hole 7 moves and comes into contact with the stopper 17 so that the diameter of the hole 7 can be partially increased to the diameter W (diameter expansion).

Next, a process of actually manufacturing a columnar body will be described. First, in FIG. 1, the rod 1 is rotated forward by the motor 23, and the diameter-enlarged excavator 3 is reduced in diameter (the state shown in FIGS. 5 and 6). As shown in FIG.
From the ground to a predetermined depth H. At that time, the discharge port 6
The liquid solidified material (cement milk) is discharged from a, and the liquid solidified material and the soil are stirred by the stirring blade 2 to generate a uniform liquid solidified material mixed soil 8 in the hole 7.

Next, the rod 1 is rotated in the reverse direction to enlarge the excavator.
3 (diameter-enlarged excavating blade 16) is expanded and rod is rotated in reverse
1 for h_Two-H₁The distance from the ground surface 10
Is h ₁~ H_TwoForm the lower enlarged diameter part 11 ((annular projection) between
To achieve.

After forming the lower enlarged diameter portion 11, the rod 1
Is rotated forward to reduce the diameter of the large-diameter excavator 3 so as to have a diameter w _1, and is raised from the ground surface 10 to a position at a depth h ₃ .
Then, while rotating the rod 1 in the reverse direction, from the depth h ₃ to the depth h ₄
The rod 1 is lifted up to form a middle-stage enlarged portion 12 like the lower-stage enlarged portion 11.

Furthermore the lower enlarged diameter portion 1 to the surface 10 as shown in FIG. 4 by raising the rod 1 from the surface to the position of the h ₅
After the upper-stage enlarged portion 13 is formed in the same manner as the first and middle-stage enlarged portions 12, the rod 1 is pulled upward from the ground surface 10. When the liquid solidified material-mixed soil 8 solidifies, a columnar body 30 (FIG. 4) is formed in the hole 7.

The liquid solidified material is discharged from the discharge port 6a when the hole 7 is dug down to form the enlarged diameter portion (the lower enlarged diameter portion 11, the middle enlarged diameter portion 12, the upper enlarged diameter portion 13) and When the rod 1 is lifted, the rod 1 may not be discharged. However, after the hole 7 is dug down, the rod 1 may be pulled up while discharging the liquid solidifying material, and the enlarged diameter portion may be formed. Further, it is preferable that the diameter-enlarged excavator 3 is provided at a position as close as possible to the tip of the rod 1.

In this embodiment, as shown in FIG. 4, an example is shown in which three enlarged diameter portions (lower enlarged diameter portion 11, middle enlarged diameter portion 12, and upper enlarged diameter portion 13) are formed. In the method of manufacturing a wet columnar body for a residential foundation ground using the body manufacturing apparatus 100 according to the present invention, any number of enlarged diameter portions can be easily provided depending on conditions such as the weight of soil and a building.

Further, the stopper 17 may be provided so as to abut the enlarged diameter excavation blade 16 at a position where the enlarged diameter excavator 3 can form an enlarged diameter portion having the largest diameter (W).
The position where the stopper 17 contacts the enlarged diameter excavation blade 16 can be changed, and the diameter (W) of the enlarged diameter portion formed in the hole 7 can be reduced.

Depending on the weight of the soil or the building, the enlarged diameter portion may not need to have the maximum diameter. In this case, the position of the stopper 17 is changed to change the diameter of the enlarged diameter portion formed in the hole 7. The diameter can be reduced to reduce the amount of excavation and shorten the working time.

[0020]

According to the method for manufacturing a wet columnar body of a foundation ground for a house according to the present invention, the rod 1 provided with the large-diameter excavator 3 is rotated forward to discharge the liquid solidified material while digging the hole 7 and thereafter discharging the liquid solidified material. 1 (for example, the ground surface 10 shown in FIG. 3).
From the position of the depth h ₁ to h _2, the position of the depth h ₃ to h ₄ , etc.
The enlarged diameter portion (annular protrusion, for example, the lower enlarged diameter portion 11 in FIG.
The middle-stage enlarged portion 12 and the upper-stage enlarged portion 13) can be formed, and the columnar body 30 can be easily formed in the hole 7.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a column manufacturing apparatus used for manufacturing a wet column according to the present invention.

FIG. 2 is a partially longitudinal side view showing a state where a hole is made in the ground by the columnar body manufacturing apparatus of FIG. 1;

FIG. 3 is a partially longitudinal side view showing a state where the diameter of a hole formed in FIG. 2 is partially enlarged.

FIG. 4 is a partially longitudinal side view showing a state where a rod is pulled up from a hole in FIG. 3;

FIG. 5 is an enlarged view of a tip portion of a rod of the excavator.

FIG. 6 is a view taken along the line VI-VI in FIG. 2;

FIG. 7 is a schematic front view showing a state in which the diameter of the diameter-extending excavator of the diameter-extending excavator in FIG. 5 is expanded.

8 is a view taken in the direction of arrows VIII-VIII in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rod 2 Stirrer blade 3 Expanding excavator (digging mechanism) 4 Excavator 5 Prop 6 Liquid solidified material supply passage 7 Hole 8 Liquid solidified material mixed soil 10 Ground surface 11 Lower enlarged portion (annular projection) 12 Middle enlarged portion (Circular protrusion) 13 Upper-stage enlarged portion (Circular protrusion) 15 Pin 16 Drilling blade 17 Stopper 20 Work vehicle 30 Columnar body 100 Columnar body manufacturing device

Claims (1)

[Claims] An excavating mechanism for providing an excavating blade and a liquid solidifying material supply means at a tip of a rod, wherein the excavating mechanism reduces the diameter at the time of forward rotation of the rod, expands the diameter at the time of reverse rotation, and excavates in the radial direction at the time of reverse rotation. Provided immediately above the excavating blade of the rod, while the rod is rotated forward and the liquid solidifying material is discharged by the liquid solidifying material supply means, the ground is dug down to a predetermined depth by the excavating blade, and the rod is formed at a desired depth. Manufacture of a wet columnar body for a foundation ground for a house, characterized in that a columnar body having an annular projection is formed by reversely rotating and partially expanding an excavation diameter in the ground or on the surface by the excavation mechanism. Method.