JP3686252B2 - Drilling and stirring equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drilling / stirring device that excavates the ground into a columnar shape and stirs and mixes the excavated soil with cement milk to form a drilling hole filled with soil cement, and in particular, the excavated soil and cement milk. It is related with the excavation and stirring apparatus which can obtain the favorable mixing state.
[0002]
[Prior art]
Conventionally, as a drilling / stirring device for forming a drilling hole filled with soil cement, a drilling shaft to which the drilling blade and the stirring blade are attached is provided between the drilling blade and the stirring blade and / or between the stirring blade and the stirring blade. It is known that a co-rotation preventing blade, which is located between them and has a diameter larger than the excavating diameter of the excavating blade, is rotatably mounted via a boss (Japanese Patent Publication No. 58-29374).
[0003]
The conventional excavation / stirring device described above engages and locks the co-rotation prevention blade into the drilling hole wall, causing the excavation shaft to idle with respect to the co-rotation prevention blade and co-rotating with the agitation blade rotating together with the excavation shaft. The mass of excavated soil to be tried is held by a common rotation prevention blade that stops, and attempts to prevent poor mixing with cement milk due to the common excavation of excavated soil.
[0004]
[Problems to be solved by the invention]
However, in the case of the conventional excavation / stirring apparatus, the stirring region by the stirring blade is limited to a circular region in which the stirring blade rotates and shears the excavated soil in the horizontal direction, and the stirring blade is simply located in the path. Since it only pushes away the soil, a wide range of excavated soil cannot be effectively fluidized and stirred. That is, the excavated soil in the region where the stirring blades are located is merely sheared and stirred in a ring shape, and there is a problem that high stirring efficiency is difficult to obtain. In addition, since the excavation shaft is raised and lowered while the co-rotation prevention wing is biting into the excavation hole wall, there is also a problem that the excavation hole wall is easily scraped by the common rotation prevention wing.
[0005]
The present invention has been made in view of the above-described conventional problems. In the excavation / stirring device, the excavation hole wall is prevented from being crushed and the excavated soil in a wide range is effectively fluidized and efficiently. The purpose is to allow stirring.
[0006]
[Means for Solving the Problems]
For this purpose, the present invention provides an ascending / descending movement in which the outer pipe that rotatably holds the excavating rod penetrating through the center portion penetrates up and down and can be forcibly moved up and down along the rails provided on the outer circumference of the outer pipe. A stirrer blade that is capable of forcibly rotating around the stirrer shaft and fits within the diameter of the excavation hole is attached to the stirrer shaft that protrudes outward from the lifting box . An excavation / stirring device is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Based on FIG.1 and FIG.2, an example of the excavation and stirring apparatus which concerns on this invention is demonstrated.
[0008]
FIG. 1 is a view showing an example of a digging / stirring apparatus according to the present invention in a digging state, and FIG. 2 is an enlarged cross-sectional view of the vicinity of a lifting box 1 in the digging / stirring apparatus shown in FIG.
[0009]
In the figure, reference numeral 2 denotes an excavation rod, which vertically penetrates the central portion of the outer tube 3 and has an excavation blade 4 at its tip. Further, an injection path 19 (see FIG. 2) is formed through the central portion of the excavation rod 2 in the axial direction to inject cement milk into the excavation hole.
[0010]
The outer tube 3 holds the excavation rod 2 in a freely rotatable manner, and penetrates the lifting box 1 located in the middle up and down. Two pairs of upper and lower sprockets 5, 6 are attached to the upper and lower portions of the outer tube 3 so as to be shifted by about 180 degrees in the outer circumferential direction of the outer tube 3, and the chain 7 is spanned around each. One side of each chain 7 is connected to a connecting portion 8 of the lifting box 1. Further, four rails 9 extending vertically are provided on the outer periphery of the outer tube 3, and a rack 10 is formed along the rails 9.
[0011]
A traveling wheel 11 that travels on each rail 9 is mounted in the elevating box 1. The elevating box 1 is held in a state in which the traveling wheel 11 can move up and down with respect to the outer tube 3 by sandwiching the outer tube 3 from four directions via the rail 9. Further, as described above, since one side of the chain 7 spanned between the sprockets 5 and 6 is connected to the connecting portion 8 of the lifting box 1, for example, the upper sprocket 5 is rotated by a hydraulic motor or the like. When the chain 7 is rotated, the lifting box 1 can be forcibly moved up and down along the outer tube 3. For example, in FIG. 1, when the chain 7 is rotated clockwise, the elevating box 1 is raised, and conversely when it is rotated counterclockwise, the elevating box 1 is lowered.
[0012]
A stirring shaft 12 protrudes outward from both sides of the lifting box 1, and a stirring blade 13 is attached to the stirring shaft 12. The stirring blade 13 has a size that fits in the radial direction of the excavation hole excavated by the excavation blade 4. That is, the size of the stirring blade 13 is at least a size that does not bite into the excavation hole wall 14.
[0013]
On the other hand, a bevel gear 15 is fixed to the end of the agitation shaft 12 on the side of the elevating box 1, and this bevel gear 15 is placed on the agitation drive shaft 16 held in the elevating box 1 in a direction perpendicular to the agitation shaft 12. It meshes with the bevel gear 17. A stirring drive gear 18 is fixed to the stirring drive shaft 16, and the stirring drive gear 18 meshes with the rack 10 on the outer periphery of the outer tube 3 described above. Accordingly, when the elevating box 1 is forcibly moved up and down, the stirring drive gear 18 meshing with the rack 10 is rotated to rotate the stirring drive shaft 16, and this rotation causes the double bevel gears 17 and 15 to rotate. Thus, the stirring shaft 12 is rotated, and the stirring blade 13 is forcibly rotated around the stirring shaft 12.
[0014]
Next, the operating state of the apparatus described in FIGS. 1 and 2 will be described.
[0015]
First, the excavation rod 2 is rotated and an excavation hole is formed by the excavation blade 4. At this time, since the outer tube 3 is rotatable with respect to the excavation rod 2, the outer tube 3 does not rotate, and only the excavation rod 2 rotates. In addition, as shown in FIG. 1, the stirring blades 13 are pushed vertically into the excavated soil as the excavation progresses, and are moved forward as the excavation progresses.
[0016]
After the drilling hole of the required depth is formed, the rotation of the drilling rod 2 is stopped, the cement milk is injected into the drilling hole from the injection path 19, and the chain 7 is rotated so that the lifting box 1 is moved at an appropriate interval. Force move up and down. Thus, the stirring blade 13 is forcibly moved up and down while being forced to rotate around the stirring shaft 12, and the excavated soil can be stirred and fluidized and mixed with cement milk over a wide range. Further, since the agitating blade 13 fits within the diameter of the excavation hole, there is no fear of crushing the excavation hole wall 14.
[0017]
In particular, if the outer tube 3 can be rotated with respect to the stopped excavation rod 2 and this stirring is performed while the outer tube 3 is slowly rotated, the stirring efficiency can be further increased.
[0018]
If the excavating rod 2 and the outer pipe 3 are gradually pulled up while stirring the cutting soil and combining with cement milk in this way, a drilling hole filled with a well-mixed soil cement is formed. be able to.
[0019]
In addition, after forming the excavation hole filled with the soil cement, the soil cement is hardened as it is to strengthen the ground. Furthermore, if the soil cement is hardened after the piles have been laid, a stronger ground reinforcement can be achieved.
[0020]
In the illustrated example, the vertical movement of the lifting / lowering box 1 is performed by a chain 7 spanned between the sprockets 5 and 6, but a hydraulic motor is provided in the lifting / lowering box 1, and this hydraulic motor The lifting box 1 can also be forcibly moved up and down. For example, if the stirring drive shaft 16 is rotationally driven by a hydraulic motor, the vertical movement of the lifting box 1 and the forced rotation of the stirring blade 13 can be simultaneously performed by one hydraulic motor. Further, the vertical movement of the lifting / lowering box 1 can be performed by the chain 7 shown in the figure, and the stirring blade 13 can be forcibly rotated by a hydraulic motor in the lifting / lowering box 1. For example, the stirring drive shaft 16 may be rotated by a hydraulic motor without providing the stirring drive gear 18.
[0021]
【The invention's effect】
The present invention is as described above, and has the following effects.
[0022]
(1) Since the excavated soil can be agitated while forcibly rotating the stirring blade 13 that is forcibly moved up and down, a wide range of excavated soil can be fluidized to obtain a good mixed state with cement milk. it can.
[0023]
(2) Since the agitating blade 13 has a size that fits in the radial direction of the excavation hole excavated by the excavation blade 4, there is no fear of crushing the excavation hole wall 14. Therefore, the collapse of the excavation hole wall 14 does not cause poor mixing of excavated soil and cement milk, and does not make it difficult to insert the pile when the pile is set.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a digging / stirring apparatus according to the present invention in a digging state.
FIG. 2 is an enlarged cross-sectional view of the vicinity of a lifting box in the excavation / stirring apparatus shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lifting box 2 Drilling rod 3 Outer tube 4 Drilling blade 5 Sprocket 6 Sprocket 7 Chain 8 Connecting part 9 Rail 10 Rack 11 Traveling wheel 12 Stirring shaft 13 Stirring blade 14 Drilling hole wall 15 Bevel gear 16 Stirring drive shaft 17 Bevel gear 18 Stirring Drive gear 19 injection path

Claims (5)

An outer tube that rotatably holds the excavating rod penetrating the center portion penetrates up and down, and is equipped with an elevating box that can be forcibly moved up and down along rails provided on the outer periphery of the outer tube. Agitating shaft that protrudes outward from the lifting box is equipped with an agitating blade that can be forcibly rotated around the agitating shaft and fits within the diameter of the excavation hole to be excavated. Stirring device. The lifting box is connected to one side of the chain spanned between the sprockets attached to the upper and lower parts of the outer tube, and is forced to move up and down by rotating the chain between both sprockets. The excavation / stirring device according to claim 1 Lifting boxes, excavation and stirring apparatus according to claim 1, characterized in that the forced movement up and down by a hydraulic motor provided in the cabin. 4. The excavation according to claim 2 , wherein the agitation shaft meshes with a rack provided in the outer pipe and is forcibly rotated by rotation of an agitation drive gear that is rotated in accordance with the forcible vertical movement of the elevating box.・ Agitator. The excavation / stirring apparatus according to claim 2 or 3 , wherein the stirring shaft is forcibly rotated by a hydraulic motor provided in the elevating box.

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