Soil modifying machine

Details Soil modifying machine Soil modifying machine

2000-09-19

2003-07-22

Husar, John M. (Department: 3725)

Solid material comminution or disintegration

Apparatus

Combined or convertible

C241S101740, C241S152200

Reexamination Certificate

active

06595446

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a soil modifying machine for modifying or improving soil in a state of clay which is obtained by condensation and dewatering of muddy water generated at a crushing field, a shield-type tunnel excavating field or the like, such a modified soil being thereafter recycled as backfill (soil to be refilled) or roadbed material.
Further, it is first to be noted that although the term “modify (modification or modified)” used herein may be substituted with “improve” or “ameliorate”, the meaning thereof is to modify (improve or ameliorate) nature, form quality or the like of a soil.
For example, Japanese Patent Laid-open (KOKAI) Publication No. HEI 11-169739 proposes such a soil modifying machine.
This soil modifying machine generally comprises, as shown in
FIG. 33
, a machine body, not shown, a mixer
1
, a modified soil conveyer
2
, a soil conveyer
3
, a soil conditioner supply device
4
and a soil hopper
5
. In a such soil modifying machine, a soil to be modified
6
, e.g., raw soil in the soil hopper
5
is conveyed to the mixer
1
through the material soil conveyer
3
and a soil conditioner is supplied from the soil conditioner supply device
4
to the soil
6
on the way of being conveyed by the soil conveyer
3
. Thereafter, the soil
6
and the soil conditioner is supplied to the mixer
1
so as to be crushed and mixed, and the thus modified soil
7
is discharged out of the machine body by means of the modified soil conveyer
2
.
In such a soil modifying machine, the mixer
1
has an outer case (or housing)
10
in which a soil cutter cutting) device
11
as a primary mixer and a plurality of impact hammers (rotors having rotators)
12
are disposed so that the soil
6
conveyed by the soil conveyer
3
is cut off and dropped down by the soil cutter device
11
towards the impact hammers
12
, and such soil and soil conditioner are crushed and then mixed by the impact hammers
12
, thus performing the soil modification. The modified soil
7
is dropped down on the modified soil conveyer
2
through a discharge port
8
.
Incidentally, in the soil crushing field or site, raw stones which are collected from a mountain or the like, are crushed by a crusher, and mud component or like adhering or sticking to the crushed stones are washed and removed so that the crushed stones can be utilized as aggregate.
The mud component removed in the above process is in a state of muddy water, which is then condensed and dewatered by a dehydrating (dewatering) press into a soil in the form of clay called as dewatered cake, which is then treated. When the dewatered cake is dried, fine particles scatter from its surface, and when the dewatered cake is wetted by rain water or like, it returns to the original muddy state.
As mentioned above, the dewatered cake has a low strength, and hence, in a case where such dewatered cake is recycled as backfill or roadbed material, the fine particles thereof will be scattered on sunny days or will be wet and flowed on rainy days, thus being inconvenient. Accordingly, it is difficult to recycle the dewatered cake as the backfill or roadbed material, and hence, such dewatered cake is left as it is in the raw stone crushing filed or site in a mountain.
The inventors of the subject application have tried to modify the soil condition by using a conventional soil modifying machine for recycling the dewatered cake as backfill or roadbed material, it was impossible to modify the soil condition to an extent suitable for recycling the dewatered cake as the backfill or roadbed material until the dewatered cake is very finely crushed and mixed with a solidifying agent because the dewatered cake has a low strength and is composed of a fine particle soil.
Through the research and experiment of the inventors, thereafter, the following matters were found out.
The soil cutter device
11
of the mixer
1
described above has a structure, as shown in
FIG. 34A
, that a plurality of cutters
14
, each having a long scale, are mounted around a rotational shaft
13
so as to extend radially and to form widened V-shaped spaces
15
between the adjacent cutters
14
and the rotational shaft
13
, respectively. When the rotational shaft
13
is rotated, the cutters
14
are also rotated to thereby cut off the soil
6
conveyed through the soil conveyer
3
.
During the above cutting operation, when lump of clay
16
which cannot be cut by the cutter
14
exists in the soil
6
, as shown in
FIG. 34A
, the cutter
14
which collides with the clay lump
16
, is rotated while pushing the clay lump
16
into the material soil
6
as shown in
FIGS. 34B and 34C
and passes the clay lump
16
without cutting it. Thereafter, as shown in
FIG. 34D
, the next cutter
14
digs out the clay lump
16
and sputter it in a direction of the preceding cutter
14
into the V-shaped space
15
between this cutter
14
and the preceding cutter
14
. When the cutter
14
is further rotated, the clay lump
16
between the space
15
drops down towards the impact hammers
12
as shown in FIG.
33
.
As mentioned hereinbefore, when the soil cutter device
11
of the conventional structure is utilized, the lump of clay
16
which cannot be cut off by the cutter may fall downward as it is towards the impact hammers
12
, there increases a possibility of the clay lump having a large diameter being mixed with the cut soil
6
.
The clay lump having a large particle (soil) diameter has a worse infiltration of the soil conditioner. That is, in such a clay lump, even if the soil conditioner adheres to the outer surface of the clay lump, the soil conditioner hardly infiltrates thereinto, and hence, the inside central portion of the clay lump will maintain its clay state. As a result, in a case where the clay lump having a large diameter is mixed with the raw soil at a large mixing ratio, the soil conditioner cannot be sufficiently mixed with the soil, and hence, the modified soil which can be recycled as the backfill or roadbed material will not be obtainable.
Furthermore, in the conventional structure, the impact hammer
12
comprises a central rotational shaft
17
and four hammer pieces (blades)
18
mounted thereon so as to extend radially, each hammer pieces
18
being a forged product in a fist-like shape. Because of such a structure, the hammer piece
18
has a not so-large beating surface for giving an impact to the materials to be mixed (soil to be modified and soil conditioner), and moreover, since the beating surface is curved, the materials will not be fully crushed by the impact, and the dewatered cake will not be made fine, thus maintaining a large percentage of existing clay lump having a large diameter to be mixed.
Accordingly, in this case, as like as the aforementioned case, the soil conditioner cannot be sufficiently mixed with the soil to be modified, and hence, the modified soil which can be recycled as the backfill or roadbed material will not be obtainable.
SUMMARY OF THE INVENTION
An object of the present invention is to substantially eliminate defects or drawbacks encountered in the prior art mentioned above and to provide a soil modifying machine for obtaining a modified soil which can be recycled as backfill or roadbed material by mixing soil in the form of clay such as dewatered cake and a soil conditioner.
The inventors of the subject application have searched and experienced in view of the prior art mentioned above and found out that the soil could be finely granulated by improving a shape of a soil cutter device of a mixer to be a modified soil which can be recycled as backfill or roadbed material.
Further, the inventors have found out that the soil could be finely granulated by improving a shape of an impact hammer of a mixer to be a modified soil which can be recycled as backfill or roadbed material.
Furthermore, the inventors have also found out that the once modified soil can be further finely granulated by again mixing it by another mixer disposed downstream side of the first mentioned mixer to thereby be a modified

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