JP3971322B2 - Wet column manufacturing equipment for foundation ground - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for manufacturing a wet columnar body of a foundation ground that supports a building such as a house.
[0002]
[Prior art]
In the conventional wet columnar body manufacturing apparatus, when the rotating shaft is rotated in the direction opposite to the direction in which the excavation hole is dug down, the diameter-expanded blade opens, and this type 1 expands in the radial direction (Patent Documents 1 and 2). ) And type 2 (Patent Document 3) that widens the excavation hole by pressing the excavation hole radially outward with a hydraulic cylinder.
[0003]
In order to mix the soil in the excavation hole with the milk-like solidification material (cement-based solidification material), the rotation shaft must be rotated in the direction opposite to the direction in which the excavation hole is dug down. By the way, in the type 1 (patent documents 1 and 2), when the diameter of the excavation hole is partially enlarged, the rotation shaft is reversely rotated. However, if the reverse rotation is performed, the excavation hole is enlarged at that position. It is impossible to reversely rotate at a height where there is no intention of expanding the diameter. Accordingly, there is a difference in the degree of stirring and mixing of the soil and the milk-like solidified material at the expanded diameter position and other portions, and it is impossible to manufacture a columnar body that is uniformly mixed as a whole.
[0004]
Moreover, in the type 2 (patent document 3), if the soil to be excavated is highly viscous, an excessively strong hydraulic cylinder and pressing member are required to finish the diameter of the expanded portion to a desired dimension. Even if the construction is completed, the cost becomes high.
[0005]
[Patent Document 1]
JP 2002-61177 A (FIG. 8)
[Patent Document 2]
Japanese Utility Model Publication No. 3-54882 (Fig. 2)
[Patent Document 3]
JP 2000-248867 A (FIGS. 5 to 9)
[0006]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a wet columnar body manufacturing apparatus that can surely finish a diameter-enlarged portion of a columnar body to a desired dimension and that can manufacture a generally uniform columnar body. .
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention of claim 1, the hollow rotating column 1 having the excavation blade 3 at the lower end is rotated to dig the excavation hole 50 from the ground surface, and the excavation hole 50 is partially expanded in diameter. In the wet columnar body manufacturing apparatus provided with the diameter expansion means 4 for forming the diameter expansion portions 51 and 52 in the excavation hole 50,
The diameter expansion means 4 includes a partial expansion head 12 that can be reciprocated by hydraulic pressure. When forming the enlarged diameter portions 51 and 52 in the excavation hole 50, the partial expansion head 12 is projected. The rotating column 1 is rotated so that the excavation hole 50 is excavated radially outward by the partial enlargement head 12, and the co-rotation preventing member 5 having a stirring member 30 protruding downward near the upper portion of the excavation blade 3. The soil around the rotating column 1 and the milk-like solidifying material between the co-rotation preventing member 5 and the excavating blade 3 are prevented from rotating integrally with the rotating column 1 and at the center of the rotating column 1. A check valve is provided at the discharge port 9 at the lower end of the pipe 6, a plate 22 crossing the lower side of the discharge port 9 is fixed, and a gap 23 is provided between the plate 22 and the discharge port 9 to discharge from the discharge port 9. Milky solidified material passes through the gap 23 And so scattered without漫遍To collides with the plate 22 which rotates together with the rotating column 1 wellbore 50.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are schematic external views of a columnar body manufacturing apparatus 100 that manufactures a wet columnar body. As shown in FIG. 1, the columnar body manufacturing apparatus 100 is mounted on a residential ground improvement vehicle 90 having an outrigger 97. The residential ground improvement vehicle 90 can lift the vehicle body so that the wheel 90a is lifted off the ground by a jack 91 provided on the outrigger 97 when excavation work described later is performed.
[0009]
The residential ground improvement vehicle 90 supports the columnar body manufacturing apparatus 100 and can be expanded and contracted in the direction of the arrow C (longitudinal direction) by the expansion and contraction portions 92a and 92b, and the arm portion 92 is rotated in any direction. And a rotation unit 95. Further, the inclination angle of the arm portion 92 is changed by an angle R (FIG. 2), and the length of the arm portion 92 is adjusted in the direction of arrow C, so that the state shown in FIG. 1 is changed to the state shown in FIG. ), The columnar body manufacturing apparatus 100 is moved up and down to excavate the ground so that the excavation hole 50 faces the vertical direction. Columnar body manufacturing apparatus 100 as shown in FIG. 1, the motor 89, and a mortar lumi Rukusuiberu 98 and hydraulic swivel 99 at the top.
[0010]
FIG. 3 is a schematic cross-sectional view of the excavation hole 50 excavated to a predetermined depth by the columnar body manufacturing apparatus 100. A hollow rotating column 1 which can be rotated in the forward direction (direction in which the excavation hole 50 is dug down) or in the reverse direction (direction in which the soil and milk-like solidified material in the excavation hole 50 are stirred and mixed) by the motor 89 shown in FIG. Excavation blade 3 fixed to the lower end of the column 1, a hydraulic cylinder 4 (diameter expanding means) installed in the vicinity of the excavation blade 3 of the rotating column 1, and a rotating column 1 that can be rotated by support members 20 and 21. It is comprised from the co-rotation prevention board 5 etc. which were made.
[0011]
A mortar milk swivel 98 of the columnar body manufacturing apparatus 100 shown in FIG. 1 connects a milk-like solidified material supply pipe 94 for supplying a milk-like solidified material from a milk plant 88 and a pipe 6 described later, and a hydraulic swivel. 99 connects two hydraulic supply pipes 93 for supplying or recovering pressure oil from an oil plant (not shown) mounted on the residential ground improvement vehicle 90 and hydraulic pipes 7 and 8 to be described later. By the mortar milk swivel 98 and the hydraulic swivel 99, the pipe 6 and the hydraulic pipes 7 and 8 can be arranged in the rotating column 1 that is rotationally driven by the motor 89.
[0012]
The excavation blade 3 is attached to the lower end of the rotary column 1 so as to dig up the excavation hole 50 when the rotary column 1 rotates forward. Further, the two hydraulic cylinders 4 are provided with partial enlargement heads 12 that can reciprocate in the radial direction of the excavation hole 50, and the rotating columns 1 are located at substantially the same positions as the mounting positions of the excavation blades 3 so as to face each other. Is provided. The co-rotation prevention plate 5 (co-rotation prevention member) is provided above the excavation blade 3 of the rotating column 1. A plurality of stirring blades 2 extending in the radial direction are installed on the rotary column 1 further above the co-rotation prevention plate 5. The stirring blade 2 has a function of stirring and mixing the milk-like solidified material and the soil in the excavation hole 50. The co-rotation preventing member is not limited to a plate-like member such as the co-rotation preventing plate 5 and may be a rod-like member composed of one or a plurality of sets. As shown in FIG. 3, the co-rotation preventing member (co-rotation preventing plate 5) is preferably further provided with a stirring member 30 protruding downward. When the stirring member 30 is provided, it is possible to satisfactorily prevent the soil between the excavating blade 3 and the co-rotation prevention plate 5 and the milk-like solidified material from forming a dumpling before being sufficiently stirred.
[0013]
4 is a view taken in the direction of arrows IV-IV in FIG. As shown in FIG. 4, the co-rotation prevention plate 5 protrudes radially outward from the inner diameter D of the excavation hole 50, and is buried in the inner wall of the excavation hole 50 by a length L. The co-rotation prevention plate 5 does not rotate when the excavation blade 3 rotates together with the rotary column 1 to dig down the excavation hole 50, and descends while sinking into the inner wall of the excavation hole 50 (that is, prevents the rotation with the excavation blade 3. The plate 5 rotates relatively). FIG. 4 shows an example in which three co-rotation prevention plates 5 are provided. For example, if the soil viscosity is relatively high, the co-rotation prevention plate 5 is used to reduce the amount of soil adhering to the co-rotation prevention plate 5. The number of the plates 5 can be two, or conversely, if the viscosity is low, it can be four or more. Thus, the number of the co-rotation preventing plates 5 can be arbitrarily set depending on the soil.
[0014]
As shown in FIG. 4, a pipe 6 through which the milk-like solidified material passes and hydraulic pipes 7 and 8 through which the pressure oil passes are arranged inside the hollow rotating column 1. As shown in FIG. 1, a hydraulic supply pipe 93 and a milk-like solidifying material supply pipe 94 are arranged along the arm portion 92 of the residential ground improvement vehicle 90.
[0015]
The milk-like solidification material supply pipe 94 shown in FIG. 1 is connected to the pipe 6 shown in FIG. With these configurations, the columnar body manufacturing apparatus 100 can be supplied with milk-like solidified material and pressurized oil.
[0016]
At the lower end of the pipe 6, a discharge port 9 for milk-like solidifying material is provided. The discharge port 9 is provided with a check valve (not shown) so that earth and sand in the excavation hole 50 does not flow back and enter. The milk-like solidified material is discharged into the excavation hole 50 while performing excavation work with the excavation blade 3.
[0017]
5 is a VV arrow view of FIG. As shown in FIGS. 3 and 5, a plate 22 that crosses below the discharge port 9 of the pipe 6 is fixed to the lower end of the rotary column 1. As shown in FIG. 3, a gap 23 is provided between the plate 22 and the discharge port 9. The milk-like solidified material discharged from the discharge port 9 collides with the plate 22 that rotates together with the rotating column 1 through the gap 23 and is uniformly scattered in the excavation hole 50. A shielding plate 24 is provided between the rotary column 1 and the pipe 6 so that dirt and milk-like solidified material do not enter.
[0018]
The hydraulic supply pipe 93 shown in FIG. 1 is connected to the hydraulic pipes 7 and 8 shown in FIG. 10 and 11 are schematic sectional views of the hydraulic cylinder 4. As shown in FIG. 10, the hydraulic cylinder 4 includes a main body 11, a guide cylinder 10, a partial enlargement head 12, and the like. The main body 11 and the guide tube 10 are integrally fixed to the rotating column 1. Oil passages 14 and 15 are provided in the main body 11. As shown in FIG. 10, the partial enlargement head 12 has a hollow structure that can accommodate the main body 11 with the other end closed and one end opened. A packing 13 is fixed to the opening of the partial enlargement head 12. The packing 13 is slidable with respect to the main body 11 while keeping watertight with the main body 11.
[0019]
In other words, the partial enlargement head 12 can reciprocate along the guide cylinder 10, and the hydraulic cylinder 4 is hydraulically accommodated in the guide cylinder 10 so as to be accommodated in the guide cylinder 10 when the diameter expansion excavation operation described in detail later is not performed. Is working.
[0020]
A chamber 16 and a chamber 17 are formed between the main body 11 and the partially enlarged head 12. Water tightness is maintained between the chamber 16 and the chamber 17, and as shown in FIGS. 10 and 11, the oil passage 14 communicates with the chamber 16, and the oil passage 15 communicates with the chamber 17. Yes. That is, the pressure oil is supplied or recovered from the hydraulic pipe 8 shown in FIG. 4 to the chamber 16 via the oil path 14 and similarly supplied from the hydraulic pipe 7 to the chamber 17 via the oil path 15 or recovered. It has become.
[0021]
As shown in FIG. 11, when oil is supplied from the hydraulic pipe 7 to the chamber 17 via the oil path 15, the oil in the chamber 16 is recovered to the hydraulic pipe 8 via the oil path 14, and the hydraulic pressure is reversed. When oil is supplied from the pipe 8 to the chamber 16 through the oil passage 14, the oil in the chamber 17 is recovered to the hydraulic pipe 7 through the oil passage 15 as shown in FIG. 10. The amount of oil supplied and the amount of protrusion of the partially enlarged head 12 corresponding to this amount supplied can be grasped by a meter or monitor (not shown) installed in the interior of the residential ground improvement vehicle 90 shown in FIGS. It is like that.
[0022]
If the pressure oil is supplied from the hydraulic pipe 7 to the chamber 17 and the oil is recovered from the chamber 16 via the hydraulic pipe 8, the partial enlargement head 12 protrudes from the inside of the guide tube 10 to the state shown in FIG. Become.
[0023]
Conversely, when pressurized oil is supplied from the hydraulic pipe 8 to the chamber 16 and oil is recovered from the chamber 17 via the hydraulic pipe 7, the partial enlargement head 12 is accommodated in the guide tube 10 and is shown in FIG. A state (that is, a state in which the partial enlargement head 12 is accommodated in the guide tube 10) is obtained.
[0024]
Next, the process of forming the first enlarged diameter portion 51 and the second enlarged diameter portion 52 in the excavation hole 50 will be described. As shown in FIG. 3, after the excavation blade 3 completes excavation of the excavation hole 50 having a predetermined depth, the columnar body manufacturing apparatus 100 proceeds to a step of forming the first diameter-expanded portion 51.
[0025]
FIG. 6 is a schematic cross-sectional view of the excavation hole 50 on the way that the columnar body manufacturing apparatus 100 forms the first enlarged diameter portion 51. As shown in FIG. 6, the inner diameter of the excavation hole 50 is the dimension D, but the inner diameter of the first expanded diameter portion 51 is further expanded by twice the dimension W.
[0026]
When starting the expanded working, partial enlarged head 12 is pressurized oil to the hydraulic cylinder 4 so as to protrude by a dimension w ₁ is supplied. The hydraulic cylinder 4 (partially enlarged head 12) rotates together with the rotary column 1 in the direction indicated by the arrow A in FIG. 5, and the outer peripheral end of the partly enlarged head 12 moves the first enlarged part 51 of the excavation hole 50 in the radial direction. dimension _{w 1,} to drill by the dimension _{t 1} in the height direction. This dimension w ₁ can be arbitrarily set in accordance with the hardness of the soil to be excavated. Since the excavation resistance is smaller as the soil hardness is lower, the lift amount of the columnar body manufacturing apparatus 100 and the protrusion amount of the partial enlargement head 12 can be set larger.
[0027]
While rotating the columnar body manufacturing apparatus 100 is gradually increased setting the projecting amount of a portion enlarged head 12, when expanded drilling the remaining dimensions w _2, first diverging section 51 is enlarged by W as a whole. Next, the state shown in FIG. 7 when drilling the remaining height t ₂ gradually lift the entire columnar body manufacturing apparatus 100 by housing ground improvement wheel 90 shown in FIG. 2 while rotating the columnar body manufacturing apparatus 100, the width The first enlarged diameter portion 51 having the dimension W and the height dimension T is completed. Here, the dimensions W and T can be set to arbitrary sizes, and the operator can check the dimensions W and T with a meter (not shown) installed in the housing ground improvement vehicle 90.
[0028]
When forming the first expanded diameter section 51, the width w ₁ in a state of being protruded partially enlarged head 12 by the dimension w _1, to complete the height T above, the amount of projection of the subsequent partial enlarged head 12 to The width may be gradually increased to approach the dimension W. According to the hardness of the soil to be excavated, the protrusion amount of the partial enlargement head 12 and the lift amount of the columnar body manufacturing apparatus 100 are adjusted so that the diameter expansion excavation can be smoothly performed, and only the width dimension W remains with the height dimension t _1. May be completed first, or the height dimension T may be completed _first while the width dimension w _{1 is} constant.
[0029]
After the completion of the first enlarged diameter portion 51, as shown in FIG. 10, oil (hydraulic pressure) is supplied to the hydraulic cylinder 4 so that the partial enlarged head 12 is accommodated in the guide tube 10, and the residential ground improvement vehicle 90 (FIG. 1). Thus, the columnar body manufacturing apparatus 100 is lifted to the height of the second enlarged diameter portion 52 as shown in FIG.
[0030]
The second enlarged portion 52 is also formed in the same manner as the first enlarged portion 51, and the columnar body manufacturing apparatus 100 is gradually lifted to the ground. At that time, when the rotary column 1 is rotated in the direction opposite to the direction in which the excavation blade 3 excavates, the milk-like solidified material and the soil between the excavation blade 3 and the co-rotation prevention plate 5 are well mixed.
[0031]
After the milk-like solidified material and the soil in the excavation hole 50 are uniformly mixed, the columnar body manufacturing apparatus 100 is pulled up from the excavation hole 50. Through the above steps, columnar bodies in which the milk-like solidified material and the soil are uniformly mixed and solidified are formed in the excavation hole 50, the first enlarged diameter portion 51, and the second enlarged diameter portion 52.
[0032]
【The invention's effect】
In the first aspect of the present invention, the partial enlargement head 12 that can be reciprocated by hydraulic pressure is rotated and the excavation hole 50 is subjected to diameter excavation with the partial enlargement head 12. It can be accommodated without projecting in the radial direction, and in order to stir and mix the milk-like solidified material and the soil in the excavation hole 50, the columnar body manufacturing apparatus 100 is rotated in the excavation blade 3 during the excavation direction. It can be rotated in the reverse direction. Therefore, it is possible to produce a high-quality wet columnar body having a uniform mixed state as a whole.
Further, the amount of pressure oil supplied to the hydraulic cylinder 4 allows the operator to easily grasp the amount of protrusion of the partial enlargement head 12, and the first enlarged portion 51 (second enlarged portion 52) that ensures the dimension W reliably. Can be formed.
Furthermore, since the co-rotation prevention plate 5 (co-rotation prevention member) is provided above the excavation blade 3, the milk-like solidified material and soil around the rotary column 1 between the excavation blade 3 and the co-rotation prevention plate 5 are Rotation with the rotating column 1 can be avoided, and the milky solidified material and the soil between the rotating excavating blade 3 and the co-rotation prevention plate 5 stopped in the ground are well mixed. Therefore, it is possible to produce a uniform columnar body that is uniformly mixed as a whole.
In addition, Then the columnar body manufacturing apparatus 100 to be mounted on a small residential ground improvement car 90, it is easy to reach through a narrow road in a residential construction site, less subject to constraints of the construction location.
[Brief description of the drawings]
FIG. 1 is an external view showing a state where a columnar body manufacturing apparatus according to the first and second aspects of the present invention is mounted on a residential ground improvement vehicle.
FIG. 2 is a schematic external view showing a state where the ground is excavated in FIG. 1;
FIG. 3 is a schematic cross-sectional view of an excavation hole 50 excavated to a predetermined depth by a columnar body manufacturing apparatus.
4 is a view taken along arrow IV-IV in FIG. 3;
FIG. 5 is a VV arrow view of FIG. 3;
FIG. 6 is a schematic cross-sectional view of a drilling hole in the middle of forming a first enlarged diameter portion by a columnar body manufacturing apparatus.
FIG. 7 is a schematic cross-sectional view of an excavation hole in a state where the formation of the first enlarged diameter portion is completed.
FIG. 8 is a schematic cross-sectional view of the excavation hole 50 showing a state in which the columnar body manufacturing apparatus is moved to the position of the second enlarged diameter portion.
FIG. 9 is a schematic cross-sectional view of an excavation hole in a state where formation of a first enlarged diameter portion and a second enlarged diameter portion is completed.
FIG. 10 is a schematic cross-sectional view of a hydraulic cylinder.
FIG. 11 is a schematic cross-sectional view of a hydraulic cylinder when expanding a drilling hole.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating column 2 Agitation blade 3 Excavation blade 4 Hydraulic cylinder (diameter expansion means)
5 Co-rotation prevention plate (co-rotation prevention member)
6 Piping 7, 8 Hydraulic piping 9 Discharge port 10 Guide tube 11 Main body 12 Partially enlarged head 13 Packing 14, 15 Oil passage 16, 17 Chamber 20, 21 Support member 22 Plate 23 Cavity 30 Stirring member 50 Drilling hole 51, 52 First , Second enlarged diameter part 90 housing ground improvement vehicle 100 columnar body manufacturing equipment

Claims (1)

The hollow rotating column 1 having the excavating blade 3 at the lower end is rotated to dig down the excavation hole 50 from the ground surface, and the diameter of the excavation hole 50 is partially expanded to form the enlarged diameter portions 51 and 52 in the excavation hole 50. In the wet columnar body manufacturing apparatus provided with the diameter expanding means 4,
The diameter expansion means 4 includes a partial expansion head 12 that can be reciprocated by hydraulic pressure. When forming the enlarged diameter portions 51 and 52 in the excavation hole 50, the partial expansion head 12 is projected. The rotating column 1 is rotated so that the excavation hole 50 is excavated radially outward by the partial enlargement head 12, and the corotation preventing member 5 having a stirring member 30 protruding downward near the upper portion of the excavation blade 3. The soil around the rotating column 1 and the milk-like solidifying material between the co-rotation preventing member 5 and the excavating blade 3 are prevented from rotating integrally with the rotating column 1 and at the center of the rotating column 1. A check valve is provided at the discharge port 9 at the lower end of the pipe 6, a plate 22 crossing the lower side of the discharge port 9 is fixed, and a gap 23 is provided between the plate 22 and the discharge port 9 to discharge from the discharge port 9. Milky solidified material passes through the gap 23 To wet columnar body manufacturing apparatus foundation ground, characterized in that so as to scatter without漫遍to collide with the plate 22 to rotate wellbore 50 with the rotary column 1.

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