JP2002371554A - Method of purifying soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To purify polluted soil down to a depth and to allow safe work execution in a city area, at the site of a factory, and the like by reducing the generation of odor and preventing ignition caused by construction work. SOLUTION: A casing 3 is erected into the ground by a full turning press-in excavating device 2 provided with a rotating drive mechanism for chucking the outer periphery of the casing 3 to replace polluted soil, and an excavating means such as a drilling bucket 4 is hung down inside from the upper end of the casing 3 to excavate and discharge soil. At this time, inert gas is led into the casing 3, and excavation is carried out while lowering the concentration of oxygen and inflammable gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying soil pollution causing odor and ignition problems in an urban area or a factory dealing with flammable substances, or for soil contaminated deep into a factory site or the like. The present invention relates to a method for purifying water.

[0002]

2. Description of the Related Art Among soil purification methods, a general method is to replace contaminated soil, and after excavating or replacing the soil after performing earth retaining with a sheet pile or the like, or when the target depth is not deep. Had been excavating and replacing in the open without excavation. For excavation, a shovel car or the like such as a backhoe is used.

[0003]

However, depending on the pollutants, an odor may be generated during excavation, and the odor may be diffused to the surroundings. Further, when excavating soil contaminated with a highly flammable organic solvent or a fuel using such an organic solvent, a gaseous combustible gas is generated. When there is such a problem of odor diffusion and generation of combustible gas, excavation and replacement in an urban area are difficult. In addition, in contaminated soil where flammable gas is generated, work in a factory that handles flammable substances is dangerous.

Heretofore, there has been almost no technology for coping with the generation of such odors and combustible gases by replacing contaminated soil.

An object of the present invention is to eliminate the disadvantages of the prior art and to purify contaminated soil, it is possible to purify the soil to a deeper part, and it is also possible to reduce the generation of odor associated with the construction and to reduce the occurrence of ignition. It is an object of the present invention to provide a soil purification method which can prevent the soil and can be safely constructed even in an urban area or a site of a factory.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly, to replace contaminated soil, the casing is rotated by a full-rotation press-fitting excavator having a rotary drive mechanism for chucking the outer periphery of the casing. When standing on the ground and suspending the excavating means from the upper end of this casing to excavate and excavate, draw in inert gas into the casing,
The point is to excavate while reducing the oxygen concentration and the flammable gas concentration.

Second, the excavating means to be suspended inside the casing is supported by a rod-like member such as a kelly bar or a rod. Third, the casing head is covered with rubber on the entire inner periphery. The outline of the excavating means to be suspended inside the casing is smaller than the inner diameter of the casing, and a gap can be secured when the excavating means is suspended inside the casing.

According to the first aspect of the present invention, the contaminated soil is partially excavated while the casing is being inserted, and solidification or poor water permeability of soil cement, lime treatment, slaked lime treatment soil, mortar, ready-mixed concrete, etc. Soil purification is carried out by replacing the material. In this way, by sequentially replacing, soil retaining is unnecessary and soil can be purified to a deep part. In addition, partial excavation can reduce odor and prevent ignition. Further, by drawing an inert gas into the casing and performing excavation while lowering the oxygen concentration and the combustible gas concentration, ignition can be further prevented.

According to the second aspect of the present invention, in addition to the above-described operation, the excavating means suspended in the casing can be prevented from swinging by being suspended and supported by a rod-shaped member such as a kelly bar or a rod. Can contact or collide with each other to generate a spark, which can prevent a fire.

According to the third aspect of the present invention, sparks can be prevented from being generated by covering the entire inner circumference of the casing head where the excavating means particularly easily contacts or collides with the casing with rubber.

According to the fourth aspect of the present invention, a digging means for hanging down inside the casing, for example, a hydro club has an outer diameter of φ1,500, which is smaller than the inner diameter of the casing (φ2,000). Since the gap can be ensured, it is possible to prevent the excavating means and the casing from contacting or colliding with each other to generate a spark, which can cause a fire.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 are explanatory views of each step showing one embodiment of the soil purification method of the present invention, wherein 1 shows contaminated soil.

According to the present invention, in order to replace the contaminated soil 1, the casing 3 is erected on the ground by a full swiveling press-fitting excavator 2 having a rotary drive mechanism for chucking the outer periphery of the casing.
An all-casing method is used in which an excavating means such as a drilling bucket 4, a hydrograb, a hammer grab, or another type of bucket is suspended from a crane 5 to discharge and excavate soil from the upper end opening of the casing 3.

Although there are various types of the full swiveling press-fitting excavating apparatus 2, a casing driver as disclosed in Japanese Patent Application Laid-Open No. 4-350936 (JP-B-7-74500) has been conventionally used as an example. Is known to.

As shown in FIGS. 6 and 7, the full swiveling press-fitting excavator (casing driver) 2 includes a base frame 7 having a substantially rectangular frame shape with a plurality of guide frames 6 standing upright.
An elevating frame 8 that is mounted to be able to move up and down along the guide frame 6, a plurality of thrust cylinders 9 that stand on the base frame 7 to elevate the elevating frame 8, and a hydraulic motor that is rotatably mounted in the elevating frame 8. A ring-shaped rotating body 11 driven to rotate by the rotating body 10;
1 and a casing gripping band 12 attached to the casing 1. The base frame 7 is provided with rigger jacks 16 at four corners.

The casing gripping band 12 includes a substantially semicircular fixed band 12a, and a pair of movable bands 1 having one end pivotally connected to both ends of the fixed band 12a.
2b and a band cylinder 13 connected to each other end of the pair of movable bands 12b by a pin, and is formed in a ring shape so as to have a casing insertion space at the center.

Then, the casing 3 is moved to the lifting frame 8
The casing 3 is contracted by being inserted through the casing insertion space of the casing gripping band 12 while being inserted through the rotating body 11 and the central space of the base frame 7 to contract the band cylinder 13 and extend the band cylinder 13. Thus, the grip can be released, and therefore, it functions as a chuck device for gripping the casing 3.

The casing 3 is provided with, for example,
No. 96 drilling bit
May be used. By attaching such an excavation bit 14, even if there is an obstacle such as a boulder or a concrete block in the middle, it can be pushed in.

Further, as shown in FIG. 5, the casing 3 covers the entire inner periphery of the head 3a with rubber 15, and the rubber 15 is provided with a folded portion 15a on the outer surface of the casing 3 to form the head 3a. It can be easily provided by sandwiching it from above and fastening it with bolts or the like. Alternatively, the rubber 15 may be attached to the entire inner periphery of the head 3a with an adhesive.

In the press-fitting step of the casing 3, as shown in FIG.
Was adjusted horizontally, the casing 3 was suspended by the crane 5, the thrust cylinder 9 was extended to the limit, the lifting frame 8 was elevated, and the band cylinder 13 was extended to extend the casing insertion space. After the state, the casing 3 is inserted into the insertion space.

The band cylinder 13 is contracted, and the casing 3 is gripped by the casing gripping band 12.

The rotating body 11 is rotationally driven by the hydraulic motor 10 to rotate the casing 3 via the casing gripping band 12.

With the casing 3 held and rotated by the casing gripping band 12 in this manner, the thrust cylinder 9 is contracted and the lifting frame 8 is lowered, whereby the casing 3 is lowered and pressed into the ground.

When the thrust cylinder 9 is contracted to the limit, the drive of the rotating body 11 by the hydraulic motor 10 is stopped, and the rotation of the casing gripping band 12 is stopped. The band cylinder 13 is extended to release the casing 3 from the casing gripping band 12.

With the grip of the casing 3 released, the thrust cylinder 9 is extended to the limit again, and the lifting frame 8 is raised. The above steps are repeated to press-fit a predetermined casing 3.

With the press-fitting of the casing 3, the drilling bucket 4 is suspended by the crane 5 and the inside of the casing 3 is excavated and discharged. , And rotate as much as possible without shaking.

Further, even if the drilling means such as the drilling bucket 4 or the hydrograb comes into contact with the opening of the casing 3, since the rubber 15 exists, the occurrence of collision spark can be prevented.

In addition to this, as the excavating means such as the drilling bucket 4 and the hydrograb, for example, one having an outer diameter of φ1,500 and smaller than the inner diameter (φ2,000) of the casing 3 may be used. By doing so, the drilling means such as the drilling bucket 4 and the hydrograb can be connected to the casing 3.
Since a gap can be secured when suspended in the inside of the, the excavation means and the casing come into contact with or collide with each other, generating sparks,
This can prevent a fire from occurring.

Further, an inert gas (incombustible gas) is blown from the cylinder 18 by a hose 19 to the casing 3 and drawn therein, and excavation is performed while reducing the oxygen concentration and the combustible gas concentration in the casing 3. As the inert gas, it is difficult to react with an organic solvent and the gas density is equal to or higher than that of air, and nitrogen, argon, carbon dioxide and the like are preferable.

Table 1 below shows examples of the inert gas.

[Table 1]

The inert gas suppresses combustion and explosion by suppressing the oxygen concentration to 15% or less, thereby enabling the soil containing the flammable substance to be safely removed.

The high quality soil is transported from the stock yard to a vessel by a dump truck, and is backfilled after the presence of a supervisor. As for backfilling, the cement soil kneaded in the plant at the site is transferred to the vessel and mixed with the high-quality soil to form a mortar-improved soil 21. The concrete hopper 20 is moved to a predetermined depth by the crane 5 or the like as shown in FIG. It is buried back in the built casing 3. A slurry may be used as the improved soil 21 or a material that replaces it. By using the slurry, re-contamination can be prevented.

This backfilling is performed up to GL-2.0 m. The casing 3 is pulled out while confirming the top of the mortar with a measuring tape.

To remove the casing 3, the thrust cylinder 9 is contracted to the limit and the lifting frame 8 is lowered, and the band cylinder 13 is extended to extend the casing insertion space. Then, the band cylinder 13 is contracted and the casing 3 is gripped by the casing gripping band 12.

The elevating frame 8 is raised together with the casing 3 by extending the thrust cylinder 9, and the casing 3 is pulled out of the ground. Next, the thrust cylinder 9 is extended to the limit and its extension is stopped. Band cylinder 13
To release the gripping of the casing 3 by the casing gripping band 12.

With the grip of the casing 3 released, the thrust cylinder 9 is again contracted to the limit and the lifting frame 8 is lowered. Again, the band cylinder 13 is contracted, and the casing 3 is gripped by the casing gripping band 12. The above process is repeated and the casing is pulled out.

Up to GL, the casing 3 is pulled out while backfilling the high quality soil with the backhoe. After completion,
The entire swivel press-fit excavator 2 is moved to the next position.

[0038]

As described above, the soil remediation method of the present invention can purify contaminated soil to a deeper level, and can reduce the generation of odor and the ignition of construction. It can be installed safely in urban areas and factory sites.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the soil purification method of the present invention.
It is explanatory drawing of a process.

FIG. 2 shows a second embodiment of the soil purification method of the present invention.
It is explanatory drawing of a process.

FIG. 3 is a third diagram showing one embodiment of the soil purification method of the present invention.
It is explanatory drawing of a process.

FIG. 4 shows a fourth embodiment of the soil purification method of the present invention.
It is explanatory drawing of a process.

FIG. 5 is a partially cutaway front view of a casing head used in the soil purification method of the present invention.

FIG. 6 is a front view showing an example of a full swivel press-fitting excavator.

FIG. 7 is a plan view showing an example of a full swing press-fitting excavator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Contaminated soil 2 ... Full-rotation press-fitting excavator 3 ... Casing 3a ... Head 4 ... Drilling bucket 5 ... Crane 5a ... Boom 6 ... Guide frame 7 ... Base frame 8 ... Elevating frame 9 ... Thrust cylinder 10 ... Hydraulic motor 11 ... Rotating body 12 ... Band 12a ... Fixed band 12b ... Movable band 13 ... Band cylinder 14 ... Drilling bit 15 ... Rubber 15a ... Folding portion 16 ... Rigger jack 17 ... Kelly bar 18 ... Bomb 19 ... Hose 20 ... Concrete hopper 21 ... Improved soil

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukio Koyama 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (72) Inventor Yoichi Doi 4-13 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (72) Inventor Yasunori Noguchi 2-16-9 Kabukicho, Shinjuku-ku, Tokyo Sumikon Cell-Tech Co., Ltd. (72) Inventor Naoyoshi Yasuda 2-16-9 Kabukicho, Shinjuku-ku, Tokyo Sumikon Cell-Tech Co., Ltd. (72 ) Inventor Joji Hiraiwa 8-14-14 Ginza, Chuo-ku, Tokyo Nippon Special Construction Co., Ltd. (72) Inventor Toyoichiro Yoshida 8-14-14 Ginza, Chuo-ku Tokyo, Nippon Special Construction F-term (Reference) 2D029 DC01 PA07 PB03 PC01 PD04 2D043 CA01 2D050 CB13 CB23 EE14

Claims (4)

[Claims] In order to replace the contaminated soil, the casing is set up on the ground by a full swivel press-fitting excavator equipped with a rotary drive mechanism for chucking the outer periphery of the casing, and the excavating means is suspended inside the casing from the upper end thereof. A soil purification method characterized in that an inert gas is drawn into a casing during excavation excavation, and excavation is performed while reducing the oxygen concentration and the flammable gas concentration. 2. The soil purification method according to claim 1, wherein the excavating means suspended inside the casing is supported by a rod-shaped member such as a kelly bar or a rod. 3. The soil purification method according to claim 1, wherein the casing head is covered with rubber on the entire inner periphery. 4. The soil purification method according to claim 1, wherein the excavating means suspended inside the casing has an outer shape smaller than an inner diameter of the casing, and a gap can be secured when the excavating means is suspended inside the casing.