JP2532342B2 - Construction machine for deep mixing processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine for a deep-layer mixing treatment method which can further improve the construction effect of the deep-layer mixing treatment method adopted for improving soft ground.

[0002]

2. Description of the Related Art A so-called deep layer mixing treatment method is known as a soft ground countermeasure method.

In the deep-layer mixing method, stabilizers such as slurry-like cement and lime and the ground soil are forcibly stirred and mixed,
Its chemical consolidation action strengthens and improves soft ground. This type has a joining method of forming improved soil in which blocks, walls, lattices, etc. are joined in the soil, and a number of pile-like improved soils are formed in the soil to form a group pile shape in a plane. The non-bonding method is included, but the latter is general from the viewpoint of ease of construction.

The non-bonding type deep layer mixing processing method is carried out by an auger device having a stirring blade. That is, if a stirring blade with a drill bit is projected at the lower end of the drive shaft of the auger device and cement milk is poured out from the lower end of the drive shaft, the cement milk will be ground soil in the excavation hole formed by the auger device. It can be forcibly mixed by stirring to form improved soil in the form of piles in the soil.

[0005]

According to the prior art, since the auger device has a structure in which the drive shaft is simply provided with a stirring blade, mixing of the cement milk and the ground soil in the excavation hole is insufficient. Therefore, there is a problem in that the strength of the pile-shaped improved soil cannot be sufficiently obtained and the predetermined improvement effect cannot be realized in many cases. That is, when the stirring blade is rotated, the slurry in the drill hole rotates together with the stirring blade almost integrally, and the former and the latter remain upward due to the difference in specific gravity between the cement and the ground soil. This is because, due to the transition, the both are not homogeneously mixed and tend to be separated into upper and lower parts.

Therefore, in view of the problems of the prior art, an object of the present invention is to attach a control plate for restricting the rotation of the slurry to the auger device, thereby sufficiently enhancing the strength of the pile-shaped improved soil. An object is to provide a construction machine for a deep-layer mixing processing method, which can surely bring out the desired improvement effect.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, the structure of the present invention comprises an auger device in which a drive shaft is provided with a stirring blade with a drill bit, and the auger device is arranged in parallel with the drive shaft. And a control plate for controlling the rotation of the slurry in the drill hole formed by the auger device, the drive shaft,
It has a spout for cement milk at the lower end and is detachably connected to the lower end of the extension shaft, while the control plate is detachably connected to the lower end of a fixed rod arranged parallel to the extension shaft. To do.

The stirring blades may be provided so as to project in a plurality of upper and lower stages with respect to the drive shaft, and the lowermost stirring blade may be formed longer than the other stirring blades.

[0009]

According to the structure of the invention, the auger device can form the excavation hole in the soil by rotationally driving the stirring blade via the drive shaft, and further, the spout at the lower end of the drive shaft. By pouring out the cement milk from the ground, it is possible to forcibly stir and mix the cement milk and the ground soil in the drill hole. At this time,
The control plate prevents the slurry formed by mixing the cement milk and the ground soil from rotating together with the stirring blades in the drill hole, and can mix the cement milk and the ground soil uniformly.

If the stirring blades are provided in a plurality of upper and lower stages, the stirring blades can forcibly stir the slurry not only at the lowermost portion of the drill hole but also at the middle portion.

Further, if the lowermost stirring blade is formed to be long, the control plate can be widely formed outside the other short stirring blades. Therefore, the control plate at this time is more effective in rotating the slurry. The slurry can be mixed homogeneously.

[0012]

Embodiments Embodiments will be described below with reference to the drawings.

The construction machine for the deep-layer mixing processing method is arranged in parallel with the drive shaft 11 and an auger device 10 in which lower end portions of the drive shaft 11 are provided with stirring blades 12, 12 ... And a control plate 21 (FIG. 1).

The drive shaft 11 is made of a pipe material and is detachably connected to the lower end of an extension shaft 31 made of the pipe material. The upper end of the extension shaft 31 is connected to a downward shaft end of the hydraulic motor 32 via a coupling 32a. On the other hand, the control plate 21 is detachably connected to the lower end of a fixed rod 33 arranged in parallel with the extension shaft 31.

The lower ends of the extension shaft 31 and the fixed rod 33 are
The bearings 31a and 33a formed integrally are vertically slidably penetrated. The hydraulic motor 32 is incorporated in the moving bracket 32b, and the upper end of the fixed rod 33 is attached to the mounting bracket 3 protruding from the moving bracket 32b.
It is connected to 3b.

The extension shaft 31 and the fixed rod 33 are parallel to the mast M1 on the front surface of the mast M1 mounted on the crawler type moving machine M via a moving bracket 32b and a fixed arm 31b supporting the bearings 31a and 33a. (Fig. 2). The mast M1 is erected up and down freely via a support pin M1a and brackets M1b and M1c so that the cylinder M1d can be expanded and contracted and its inclination angle can be set to be perpendicular to the ground surface. can do.

A winch M2 is mounted on the moving machine M, and a wire M2a of the winch M2 is connected to a moving bracket 32b via sheaves M2b and M2b for guiding the top of the mast M1. The moving bracket 32
b is a guide rail M1e attached to the front of the mast M1,
It is attached to the mast M1 via M1e so that it can move up and down. Therefore, the moving bracket 32b is attached to the winch M.
Mast M by expanding and contracting wire M2a via 2
It is possible to raise and lower along the front surface of 1, and at this time, the auger device 10 and the control plate 21 can also be raised and lowered integrally via the extension shaft 31 and the fixing rod 33.

At the lower end of the drive shaft 11, a pair of long stirring blades 12, 12 are provided at symmetrical positions so as to project (FIGS. 1 and 3). However, the stirring blades 12, 12 are obliquely attached to the drive shaft 11 so that the front side in the forward rotation direction (direction of arrow K1 in FIGS. 1 and 3) is low and the rear side is high. Further, on each of the stirring blades 12, diagonally downward facing drill bits 12a, 12a, ...

A fixed plate 11a is provided inside the lower end of the drive shaft 11.
And the flexible plate 11b are attached to face each other. However, in the normal state, the flexible plate 11b is in close contact with the fixed plate 11a by its elasticity and closes the lower end of the drive shaft 11 (two-dot chain line in FIG. 3), while the cement milk is passed from above through the drive shaft 11. When it is made to flow down (in the direction of arrow K2 in the figure), it is pushed out from the inside and the cement milk is made to flow out from the lower end of the drive shaft 11 (solid line in the figure).
That is, the fixed plate 11a and the flexible plate 11b form a check valve that allows the cement milk supplied through the drive shaft 11 to flow outside, as necessary, and the flexible plate 11b is separated from the fixed plate 11a. Thereby, the spout 11c for cement milk can be formed between the fixed plate 11a and the fixed plate 11a. However, it is assumed that the cement milk is supplied by being injected into the extension shaft 31 from a mobile cement kneading plant (not shown) through a universal coupling (not shown) and a connecting hose.

A downward chevron-shaped protection plate 11d is attached to the lower end of the drive shaft 11. In addition, the protective plate 11
A semicircular through hole 11d1 is formed at the base of d.

At the intermediate portion of the drive shaft 11, other short stirring blades 12, 12 are provided so as to project. However, the upper-stage stirring blades 12 and 12 are provided so as to project at right angles to the lower-stage stirring blades 12 and 12, and respectively have downward-facing excavation bits 12a and 12a in the rotation direction front side.

The control plate 21 is fixed in the radial direction of the drive shaft 11 by sufficiently approaching the drive shaft 11 via a fixed rod 33. A mounting portion 21a is provided so as to project from the upper portion of the control plate 21, and a notch 21b for passing the upper stirring blades 12 is formed inside the middle portion. In addition,
The outer edge 21c of the control plate 21 has a long lower stirring blade 12,
12 is at the same position as the front end of 12 and the lower end is the lower stirring blade 1
It is located immediately above 2,12.

The construction machine is moved by the moving machine M to position the mast M1 in a vertical position at a predetermined position, and then the hydraulic motor 32 is activated in the forward direction to move the winch M.
The excavation hole G can be excavated in the soil by gradually loosening the second wire M2a and lowering it. In addition,
At this time, the drill bit 12 of the lower stirring blades 12, 12
a, 12a ... excavates the bottom of the excavation hole G, and the upper and lower stirring blades 12, 12 ... vertically stir the excavated ground soil. Further, the excavating bit 12 of the upper stirring blades 12, 12
The a, 12a, ... mainly crush lumpy soil and stones contained in the ground soil.

On the other hand, at this time, the extension shaft 31, the drive shaft 11
Cement milk is supplied from above via the fixing plate 11
a, by opening the check valve composed of the flexible plate 11b and pouring cement milk from the spout 11c at the lower end of the drive shaft 11,
The cement milk can be compulsorily mixed with the ground soil in the excavation hole G by the upper and lower stirring blades 12, 12 ... to form a slurry. Further, the control plate 21 prevents the slurry thus formed from rotating integrally with the stirring blades 12, 12 ... In the excavation hole G, and mixes the cement milk and the ground soil uniformly. You can

When the excavation hole G has been excavated to a predetermined depth, the hydraulic motor 32 is reversely rotated and the stirring blades 12, 12, ... . At this time,
The slurry remaining in the excavation hole G forms pile-like improved soil in the soil when the cement is solidified.

[0026]

Other Embodiments The stirring blades 12, 12, ... Can be provided at the lower end portion of the drive shaft 11 so as to project in three stages vertically (FIG. 4).
At this time, the lowermost stirring blades 12, 12 are formed longer than the others. Further, the control plate 21 is formed with a plurality of notches 21b, 21b corresponding to the stirring blades 12, 12 of each upper stage other than the lowermost stage. However, it goes without saying that the stirring blades 12, 12, ... May be provided so as to project in three or more upper and lower stages.

The control plate 21 may have a curved portion 21d that avoids the drive shaft 11 and an extended portion 21e that is continuous with the curved portion 21d, corresponding to a portion other than the notch 21b (FIG. 5). . The control plate 21 including the respective extension portions 21e prevents rotation of the slurry on both sides of the drive shaft 11 as a whole, so that the cement milk and the ground soil can be mixed more uniformly.

In the above description, the control plate 21 has sufficient strength and restricts the rotation of the slurry in the drill hole G so as to effectively prevent the slurry from rotating together with the stirring blades 12, 12. It ’s enough if you can
The specific shape can be arbitrarily changed. Further, the fixed rod 33 is only required to be able to move up and down the control plate 21 together with the auger device 10, and its shape and supporting method may be arbitrarily determined.

[0029]

As described above, according to the present invention, a control plate for restricting the rotation of the slurry is attached to the auger device so that the slurry in the drill hole can be stirred by the auger device. Prevent them from rotating with the blades,
Since the cement milk and the ground soil can be mixed homogeneously, the pile-shaped improved soil formed in the soil does not have insufficient strength, and the expected improvement effect is surely expressed. There is an excellent effect that it can be done.

Further, the drive shaft of the auger device is detachably connected to the lower end of the extension shaft, and the control plate is detachably connected to the lower end of the fixed rod arranged in parallel with the extension shaft. The plate has a practical effect that it can be easily removed for cleaning and the like, the whole structure is simple, and the assembling work and the maintenance work are extremely easy.

[Brief description of drawings]

FIG. 1 is an overall exploded perspective view

FIG. 2 is a perspective view of a usage state

[Fig. 3] Operation explanatory diagram

FIG. 4 is a schematic perspective view showing another embodiment (1).

FIG. 5 is a schematic perspective view showing another embodiment (2).

[Explanation of symbols]

 G ... Drilling hole 10 ... Auger device 11 ... Drive shaft 11c ... Spout 12 ... Agitation blade 12a ... Drilling bit 21 ... Control plate 31 ... Extension shaft 33 ... Fixed rod

Claims (3)

(57) [Claims] 1. An auger device in which a stirring blade with a drill bit is provided on a drive shaft so as to project, and the auger device is arranged in parallel with the drive shaft.
And a control plate for restricting rotation of the slurry in the drill hole formed by the auger device, wherein the drive shaft has a cement milk spout at the lower end and is detachably connected to the lower end of the extension shaft. Meanwhile, the control plate is detachably connected to a lower end of a fixed rod arranged in parallel with the extension shaft, which is a construction machine for a deep layer mixing processing method. 2. The construction machine for a deep layer mixing processing method according to claim 1, wherein the stirring blade is provided so as to project in a plurality of upper and lower stages with respect to the drive shaft. 3. The construction machine for a deep layer mixing processing method according to claim 2, wherein the stirring blade at the lowermost stage is formed longer than the other stirring blades.