JPH1060877A - Excavating blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excavating blade which is capable of spraying a filler over the whole excavated area by providing a main body and a plurality of blades mounted radially on this main body and providing a spout of each of the blades so that they may keep different distances respectively from the turning center of the main body. SOLUTION: A plurality of blades 26 are radially mounted on a main body 20 having a hollow section where a pipe 29 having a different length is mounted on each of the blades 26. One end opening section of the pipe 29 is communicated with the hollow section of the main body 20 while the other end opening section is defined as a spout 30. When excavated, an excavation shaft is turned to one direction, thereby turning an excavation blade 11 so as to excavate with each blade 26. At the same time, a filler is force-fed to the hollow section of the excavation shaft, thereby spraying the filler in the rear side of the turning direction from the spout 30 by means of each pipe 29. It is, therefore, possible to provide an excavation blade capable of spraying the filler over the whole excavated area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mechanically mixing soil and filler material in foundation work and consolidating the same.
The present invention relates to a drilling wing used for a mixing and stirring wing device for cutting soil in a ground improvement machine for improving the ground into a columnar shape.

[0002]

2. Description of the Related Art As an apparatus for mixing and stirring cutting soil in a ground improvement machine for improving the ground into a columnar shape, for example, Japanese Patent Publication No. Sho 5
The thing shown in 8-29374 is known.

[0003] This mixing and stirring blade device for cutting soil is provided with a drilling blade and a stirring blade attached to a rotating shaft, and the filler blade is supplied to the cutting soil through a fluid passage provided in the rotating shaft. The ground is improved by mixing and stirring the cutting soil and filling material with a stirring blade.

[0004] In such a mixing and stirring apparatus, it is important to uniformly mix and stir the filler material and the cutting soil. For this purpose, it is necessary to spray the filler over the entire length in the radial direction of the excavation wing, that is, the entire cutting portion of the excavation wing.

[0005] For this purpose, for example, Japanese Patent Publication No. 61-233
As disclosed in Japanese Patent Publication No. 24, a plurality of stirring blades are radially mounted on a rotating shaft, and the stirring blades have a hollow shape and a plurality of ejection holes spaced apart in the longitudinal direction, and the hollow portion is rotated. The filling material is ejected from the ejection holes while rotating the rotating shaft while communicating with the hollow portion of the shaft.

[0006]

SUMMARY OF THE INVENTION As described above,
Since the diameter and spacing of the orifices formed in the stirring blades are made to overlap and the amount of filler injected from each orifice is uniform, processing of the orifice is very troublesome and the production cost is high. Become.

[0007] Further, since the stirring blade has a hollow shape, that is, a pipe shape, and has a low strength, a large excavating force cannot be obtained when excavating as the excavating blade.

In the above-mentioned excavator, the excavator sometimes rotates in the opposite direction between the time of excavation and the time of mixing and agitation. In this case, since the orifice is directed forward in the rotational direction, the ore is clogged with earth and sand. May be clogged.

Therefore, an object of the present invention is to provide a drilling wing capable of solving the above-mentioned problem.

[0010]

The first invention comprises a main body 20, and a plurality of wings 26 radially attached to the main body 20, and each of the wings 26 is provided with an ejection port 30 in the main body 2.
The excavation wings are provided so as to be at different distances from the center of rotation 0.

According to the first invention, the jet port 3 of each wing 26
From 0, filler material is ejected at different distances from the center of rotation of the main body. As a result, the filler material can be sprayed on all of the cut portions by the excavation wing.

Further, since it is only necessary to provide the jet port 30 for each blade 26, processing and manufacturing are easy and the manufacturing cost is low.

The second invention is directed to each wing 2 in the first invention.
6, pipes 29 having different lengths are attached, one end of each pipe 29 is communicated with the hollow portion of the main body 20, and the other end of each pipe 29 is located at a different distance from the rotation center of the main body 20. This is a digging wing with the ejection port 30.

According to the second aspect of the present invention, since the pipes 29 are attached to the wings 26 to form the ejection ports 30, the wings 26 themselves do not have the ejection ports 30 and the flow path of the filler, so that a solid plate is provided. The rigidity such as the shape can be made large, and a large excavating force can be obtained.

In addition, since the wing 26 and the pipe 29 can be separately manufactured, their manufacture becomes easy.

According to a third aspect of the present invention, there is provided the digging blade according to the first or second aspect, wherein the baffle plate 31 is attached to each of the blades 26 so as to face the jet port 30 in the wing 26.

According to the third aspect of the present invention, when the excavator wing is rotated in one direction and excavated, the filler is spouted from the ejection port 30 to be sprayed, and the excavator is rotated in the other direction to disperse the filler. When the excavated earth and sand are mixed and stirred, the baffle plate 31
Can be prevented from being clogged with earth and sand.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a digging wing 11 is mounted on the tip of a digging shaft 10, and a stirring blade 12 is mounted above the digging wing 11. This stirring blade 12
The anti-corotating wing 13 is provided between the digging shaft 10 and the digging wing 11.
It is provided to be rotatable around. The excavating shaft 10 has a hollow shape. The excavating shaft 10 is propelled while rotating, and a filling material such as cement milk is injected into the hollow portion 10a.

The agitating blade 12 has a first blade 14 attached to the excavating shaft 10.
And the second wing 15 are fixed, and the first wing 14 and the second
The blade 15 is oblique in the opposite direction to the left and right with respect to the axis of the excavation shaft 10.

The anti-corotating wing 13 has a boss 16 rotatably fitted to and mounted on the excavating shaft 10, and a horizontal wing 17, an upward wing 18 and a downward wing 19 are radially mounted on the boss 16. The boss 16 is formed by connecting a pair of semicircular bosses with bolts, and the boss 16 is connected to the excavation shaft 10 by bolts.

The excavating wing 11 has a main body 20.
As shown in FIGS. 2 and 3, the main body 20 has a mounting flange 22 serving as an excavation shaft mounting portion fixed to an upper surface of a tubular body 21 serving as a hollow blade mounting portion, and a plate 23 fixed to a lower surface. A plurality of, for example, three holes 25 are formed in the cylindrical body 21 at equal intervals in the circumferential direction.

The cylindrical body 21 has a plurality of, for example, three wings 2.
6 are fixed radially. The wing 26 is plate-shaped and is fixed obliquely with respect to the vertical. A notch 27 is formed in the lower end surface 26 a to form a blade 28.

As shown in FIG. 4, a pipe 29 is fixed to one side surface 26b of each wing 26. One end opening of each of the pipes 29 is fixed to the cylindrical body 21 and communicates with the hole 25, and the other end of each of the pipes 29 is bent at substantially 90 degrees to form a jet port 30. The length of each pipe 29 is different as shown in FIG. 5, and each jet port 30 has a different distance from the center of rotation. For example, the ejection port 30 of one wing 26 is near the tip of the wing 26 and the ejection port 30 of the other wing 26
Is the middle part of the wing 26, and the ejection port 30 of the remaining wing 26 is the wing 2
6 near the base end.

A baffle plate 31 is fixedly opposed to the jet port 30 on one side surface 26b of each wing 26.
The mounting flange 22 of the main body 20 is connected to the lower flange 32 of the excavating shaft 10 by bolts 33.

Therefore, when excavating, the excavating shaft 10 is rotated in one direction and the excavating wing 11 is rotated in the direction of arrow a in FIG.
The filler is pressure-fed in the hollow portion 10a, and is ejected to the rear side in the rotational direction from the ejection port 30 through each pipe 29 to be dispersed.

When mixing and stirring the excavated earth and the filling material, the excavating shaft 10 is rotated in the other direction, and the excavating wing 11 is rotated in the direction of arrow b in FIG. Mix and stir the filler. At this time, since the baffle plate 31 is located forward of the respective ejection ports 30 in the rotation direction, the ejection ports 3
There is no clogging with earth and sand.

The reason for rotating in the direction of arrow a during excavation as described above is to reduce the excavation resistance by giving a rake angle to the blade 26 as shown in FIG. This is to increase the resistance of the blade 26 and efficiently mix and stir as shown in FIG.

Next, the functions of the stirring blade 12 and the co-rotation prevention blade 13 will be described. By excavating and drilling the ground with the excavating wings 11 while propelling the excavating shaft 10 while rotating, the excavated soil above the excavating wings 11 (between the excavating wings 11 and the horizontal wings 17) is taken along with the excavating wings 11. As a result, the turbulent flow is generated, and the excavation between the horizontal blade 17 and the agitating blade 12 becomes a slow static flow state.

Since the resistance of the downward wings 19 from the excavated soil and the resistance of the upward wings 18 from the excavated soil are different from each other, the co-rotation prevention wings 13 do not rotate at the same speed as the excavated wings 11. Since the excavated soil near the wing 11 and the excavated soil near the stirring wing 12 do not rotate at the same speed,
The excavated soil and the injected filler can be well stirred.

[Brief description of the drawings]

FIG. 1 is a front view of a mixing and stirring device according to an embodiment of the present invention.

FIG. 2 is a plan view of a cutting wing.

FIG. 3 is a sectional view of a main body.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a plan view of a piping portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Excavation axis 11 ... Excavation wing 20 ... Main body 26 ... Wing 29 ... Piping 30 ... Outlet 31 ... Baffle plate

Claims (3)

[Claims] 1. A main body (20) and a plurality of blades (26) radially attached to the main body (20).
Characterized in that they are provided at different distances from the rotation center of the main body 20, respectively. 2. A pipe 29 having a different length is attached to each of the blades 26. One end of each pipe 29 communicates with the hollow portion of the main body 20, and the other end of each pipe 29 is rotated by the rotation of the main body 20. The excavation wing according to claim 1, wherein the ejection port is located at a different distance from the center. 3. The excavating wing according to claim 1, wherein a baffle plate 31 is attached to each of the wings 26 so as to face the jet port 30.