JP2000096551A - Great depth ground improvement machine and ground improving construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excavate the ground up to a great depth over 70 m below ground, mix with ground stabilizer to srir and to provide a great death around improvement machine for improving the around in having ground strength required for bearing a structure as well as a ground improvement method executed by using the ground improvement machine. SOLUTION: A ground improvement machine is used for a penetration discharge method, horizontal cutters 4 rotating with at least one pair of horizontal shafts 3 as the centers and driving devices 5 of them are provided at the front end of a machine frame 2 hung and borne by wire ropes 1 from the ground, and it is equipped with lower slurry injection nozzles 8 for injecting ground stabilizer to positions around the horizontal cutters 4. A soil moving mechanism 11 for moving earth and sand excavated by the horizontal cutters 4 upward from the cutter sections and a driving device thereof are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a ground having a soil bearing capacity necessary for supporting a structure by excavating the ground to a depth greater than 70 m underground, mixing with a ground stabilizer such as cement slurry and stirring. The present invention relates to a deep ground improvement machine to be improved, and a ground improvement method implemented by using the ground improvement machine.

[0002]

2. Description of the Related Art Conventionally, a deep ground improvement machine and a technique of a ground improvement method implemented by using the ground improvement machine are disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 8-302 which has already been proposed by the applicant.
Attention is drawn to the invention described in Japanese Patent Application No. 670 and Japanese Patent Application Laid-Open No. 10-54027 and the invention described in the specification and drawings of Japanese Patent Application No. 9-173887.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide the above-described deep ground improvement machine which has already been proposed, and the technical perfection of a ground improvement method carried out using the ground improvement machine. Ground up to a depth of more than 70 m below the ground, whether it is soft ground, hard cohesive soil, or gravel layer ground, etc. The purpose of the present invention is to make it possible to efficiently excavate, sufficiently mix and agitate with a ground stabilizer such as a cement slurry, and improve the ground to have a ground bearing capacity necessary to support a structure.

[0004]

Means for Solving the Problems As means for solving the above-mentioned problems of the prior art, a deep ground improvement machine according to the first aspect of the present invention excavates the ground vertically downward to a large depth, A ground improvement machine used in a so-called penetrating discharge method in which a ground stabilizer is injected into excavated soil and agitated and mixed, wherein at least one pair of horizontal shafts is provided at a tip end of a machine frame suspended and supported by a wire rope from the ground. A horizontal cutter rotating about the horizontal cutter and a driving means therefor, a lower slurry injection nozzle for injecting a ground stabilizing material into a position near the horizontal cutter, and a feeder for transferring earth and sand excavated by the horizontal cutter upward from a cutter unit. It is characterized in that a soil mechanism and its driving means are provided.

A deep soil improvement machine according to a second aspect of the present invention also excavates the ground vertically downward to a large depth, and injects a ground stabilizing material into excavated soil at an original position at the time of lifting and agitates and mixes. A ground improvement machine used in a so-called lifting discharge method, wherein a horizontal cutter rotating around at least a pair of horizontal axes and a driving means therefor are provided at a tip end of a machine frame suspended and supported by a wire rope from the ground. A lower slurry injection nozzle for injecting water, bentonite muddy water or clay slurry to a position near the horizontal cutter, a soil feeding mechanism for transferring earth and sand excavated by the horizontal cutter upward from a cutter section, and a driving means therefor. A stirring blade for stirring and mixing the ground stabilizing material with the excavated soil, a driving means therefor, and a position directly above the stirring blade Wherein the parts slurry injection nozzle.

According to a third aspect of the present invention, in place of the lower slurry injection nozzle in the deep ground improvement machine according to the first or second aspect, a high-pressure jet nozzle for converting a slurry or the like into a high-pressure jet and injecting the slurry is installed. It is characterized by the following.

According to a fourth aspect of the present invention, in the deep soil improvement machine according to the first or second aspect, the cutter blades constituting the horizontal cutter are provided evenly on the same circumference on the outer circumference of the cutter drum. The reamer plate is arranged on a plurality of circumferences which are arranged at a predetermined pitch in the axial direction of the cutter drum and penetrates deeply into each gap adjacent to the cutter blade in the axial direction. It is characterized in that it is fixed to the lower part of the device and installed downward.

According to a fifth aspect of the present invention, there is provided a reamer plate for a deep soil improvement machine according to the fourth aspect, wherein the reamer plate is provided at a central portion where a pair of horizontal cutters scrapes up excavated soil or at both outer portions of the horizontal cutter. It is characterized by being installed separately.

According to a sixth aspect of the present invention, an attitude control device for controlling the vertical accuracy of the ground improvement machine is installed on a machine frame of the deep ground improvement machine according to the first or second aspect. And

[0010] According to a seventh aspect of the present invention, in the soil transfer mechanism for the deep soil improvement machine according to the first or second aspect, the two screws are installed in parallel in a common casing in such a manner that two screws mesh with each other. The two screws are configured as a twin screw conveyor that is rotated synchronously by a driving means.

According to an eighth aspect of the present invention, there is provided a soil improvement mechanism for a deep soil improvement machine according to the first or second aspect, wherein a plurality of scraping plates are disposed in a common casing so as to face each other and move vertically. Is attached to a chain wound between sprockets installed at the upper and lower ends of the casing. The chain is driven by the driving means via the sprocket, and the scraper that has reached the upper end sprocket is folded. Means, and means for re-deploying the scraper which has descended in a folded state on the outside of the casing are provided.

According to a ninth aspect of the present invention, there is provided a soil improvement mechanism for a deep soil improvement machine according to the first or second aspect, wherein a large number of jacks arranged horizontally at a predetermined pitch in a vertical direction are provided on a machine frame. It is fixed, and the piston driven by the jack is configured to slide on the inner surface of the casing in a state where the upper and lower ones are stacked in a step inside the casing,
The multi-stage piston is characterized by being driven by each jack by slightly shifting its stroke amount.

According to a tenth aspect of the present invention, there is provided a deep ground improvement method, wherein the ground is excavated vertically downward to a large depth, and the ground stabilizing material is injected into the excavated soil at the original position in parallel with the excavation. Mixing is a deep soil improvement method belonging to the so-called penetration discharge method, in which a ground stabilizer is injected from a lower slurry injection nozzle to a position near a horizontal cutter of a ground improvement machine suspended and supported by a wire rope from the ground. Advance the excavation of the ground to a predetermined large depth and stir and mix the ground stabilizing material and the excavated soil, and transport the excavated soil mixed with the ground stabilizing material upward from the horizontal cutter unit by a soil sending mechanism, After the excavation to a large depth, the ground stabilizing material injection was stopped, and the ground improvement machine was agitated and mixed again with a horizontal cutter while raising the ground improvement machine using the wire rope. And performing.

According to the eleventh aspect of the present invention, in the deep soil improvement method, the ground is excavated vertically downward to a large depth, and the ground stabilizing material is injected into the excavated soil at the original position when the ground improvement machine is lifted, and the stirring is performed. Mixing, a deep soil improvement method belonging to the so-called lifting discharge method, in which water or bentonite muddy water or clay slurry is supplied from a lower slurry injection nozzle to a position near a horizontal cutter of a ground improvement machine suspended and supported by a wire rope from the ground. Excavating the ground to a predetermined large depth while injecting, excavating with the horizontal cutter, and excavating soil mixed with water or bentonite muddy water or clay slurry is transported upward from the horizontal cutter unit by a soil sending mechanism. After excavating to a predetermined large depth, stirring was performed while raising the ground improvement machine with the wire rope. The soil stable material is injected from the upper slurry injection nozzle installed just above the roots, and mixed and stirred with excavated soil at a stirring blade, further characterized by performing a ground improvement by stirring and mixing again with the horizontal cutter.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The deep soil improvement machine according to the first and second aspects of the present invention is characterized in that
It is suitably implemented as a ground improvement machine that excavates to a depth greater than the above, and injects a ground stabilizing material into the excavated soil, stirs, mixes, and stabilizes.

In this embodiment, ground improvement methods to be applied are roughly classified into the following two types according to construction conditions.
When excavating the ground, a ground stabilizing material (cement slurry) is injected into the vicinity of the horizontal cutter, and excavation of the ground and stirring and mixing of the excavated soil and the ground stabilizing material are performed in parallel. The so-called penetration discharge method. While excavating water, bentonite muddy water or clay slurry, which is the lubrication material for excavation, to the predetermined large depth while injecting it near the horizontal cutter, while injecting the ground stabilizing material into the area directly above the stirring blade when lifting the soil improvement machine A so-called lifting discharge method in which stirring and mixing are performed.

FIGS. 1 and 2 show an embodiment of a deep-depth ground improvement machine according to the second aspect of the present invention, which is applied to the above-mentioned lifting discharge type construction method.

That is, a pair of horizontal shafts 3 are provided at the end of a machine frame 2 suspended and supported by a plurality of wire ropes 1 supported by a guide sheave such as a support tower (not shown) on the ground. And a driving means 5 for the horizontal cutters 4 and 4 rotating around the center. The machine frame 2 has a structure in which the rate of closing the excavation hole is small (see FIG. 4).

As shown in FIG. 2, the horizontal cutter 4 comprises a cylindrical cutter drum 4a and a cutter blade 4b planted on the outer peripheral surface of the cutter drum. A cutter tip 4c is attached to the cutter blade 4b, so that hard ground having an N value of 50 or more can be excavated. At the center of the cutter drum 4a, a downward bearing plate 6 fixed to the base 2a at the lower end of the machine frame 2 is provided, and the horizontal shaft 3 is supported by the bearing plate 6. Each cutter blade 4b
Are arranged equally on the same circumference on the outer circumference of the cutter drum 4a, and are arranged in a plurality of rows on a plurality of circumferences allocated at a predetermined pitch in the axial direction of the cutter drum. The reamer plate 7 is fixedly installed on the lower base 2a of the machine frame 2 in an arrangement in which the rows of the cutter blades 4b are adjacent to each other in the axial direction so as to penetrate sufficiently deeply. Described invention).

The reamer plate 7 has a function of reducing excavation load by removing viscous soil adhering between the rows of the cutter blades 4b, or improving excavation efficiency, or a function of removing large-diameter gravel from the cutter blade 4b and the reamer plate 7. It is expected to have the function of being crushed by being sandwiched between them. Therefore, instead of the configuration in which the reamer plate 7 is provided in the upper central portion of the pair of horizontal cutters 4 and 4 as shown in FIG. (The invention according to claim 5).

Although the driving means 5 of the horizontal cutter 4 is not shown in detail, it is described in Japanese Patent Laid-Open No. Hei 8-3026.
No. 70 and JP-A-10-54027, a worm-type transmission mechanism using a hydraulic or electric motor as a power source, a long worm shaft and a worm, or a chain drive system, a gear drive system, etc. A configuration for transmitting power can be implemented.

Next, a lower slurry injection nozzle 8 for injecting water, bentonite muddy water or clay three as a lubricant for excavation is provided at a position near the horizontal cutter 4, more specifically, at an obliquely upper position on both left and right outer sides. It is fixed to the base 2a of the frame 2 and installed downward. FIGS. 1 and 4 also show a configuration in which a high-pressure jet nozzle 9 for similarly converting water or bentonite mud into a high-pressure jet and injecting it into the vicinity of the horizontal cutter 4 is shown.
This is for convenience of illustration. The lower slurry injection nozzle 8 and the high-pressure jet nozzle 9 can be selectively used depending on the properties of the ground to be excavated, and each of them is usually installed separately as needed.

Reference numeral 10 in FIG. 1 denotes a digging edge provided downward on both left and right sides of the base 2a of the machine frame 2,
Reference numeral 20 denotes a ground stabilizing machine, ground stabilizers, slurries, or power lines and hydraulic hoses of each driving means to an underground ground improvement machine
Hose as means for supplying or sending each control line, signal line and the like.

Next, the soil transfer mechanism 11 as a means for transferring the soil excavated by the horizontal cutters 4, 4 above the cutter portion, that is, above the position of the base 2a, is provided by the pair of horizontal cutters 4, 4 is installed on the base 2a in a form of rising vertically upward from a position at the upper center of the excavated soil, and a driving means 12 is provided. Therefore, the entrance (suction port) of the soil transfer mechanism 11 is
The pair of horizontal cutters 4 and 4 face the site where the excavated soil is picked up and take in the excavated soil with high efficiency.

An upper slurry injection nozzle 13 and a stirring blade 14 and a driving means 15 for positively and sufficiently stirring and mixing the ground stabilizer injected from the upper slurry injection nozzle 13 with the excavated soil are provided on the upper portion of the machine frame 2. Have been.

At the upper and lower positions of the machine frame 2, there are installed attitude control devices 16 for controlling the vertical accuracy of the ground improvement machine (the invention according to claim 6).

The deep ground improvement machine according to the first aspect of the present invention has a configuration applied to a so-called penetration discharge type construction method.
The ground stabilizing machine and the excavated soil are stirred and mixed at the same time as the excavation of the ground, and then are mixed and stirred again by the horizontal cutter at the time of pulling up. Slurry injection nozzle 13, stirring blade 14, and its driving means 1
5 is omitted. Of course, it is possible to apply to the intrusion-discharge type ground improvement method with the structure of the invention as claimed in claim 2 as a combined type for both methods.

Next, the soil transfer mechanism 11 shown in FIGS.
As is clear with reference to FIG. 4, a twin screw conveyor system in which two screws 11b and 11b are installed close to and in parallel to each other in a common tubular casing 11a in a meshing relationship. I have. The two screws 11b, 11b are synchronously rotated by a driving means 12 such as a hydraulic motor or an electric motor, and are used for transporting excavated soil (the invention described in claim 7). In the case of the soil transfer mechanism 11, the excavated soil can be transported upward from below by the forward rotation of the two screws 11b, 11b, and can be transported downward again by reversing the excavated soil.

However, the soil transfer mechanism 11 is not limited to the twin screw conveyor type configuration. For example, as shown in FIGS. 5 and 6, a plurality of scraping plates 1 that are arranged to face each other in a common casing 11 c and that move up and down.
Are attached in a chain to a chain 11g wound between sprockets 11e and 11f provided at the upper and lower ends of the casing 11c, and the chain 11g is driven by the driving means via the sprocket 11e or 11f. It can also be configured and implemented by a scraping plate system for running. The excavated soil has a configuration in which the excavated soil is successively scraped up by a scraper 11d in a chain state. In addition, the scraping plate 11 which rises in the casing 11c and reaches the upper end sprocket 11e
A means for folding d and a means for expanding the scraping plate 11d which has descended in a folded state on the outside of the casing 11c are provided, for example, as shown in FIG. 7 (the invention according to claim 8).

FIG. 7 shows means for folding the scraping plate 11d,
As a means for expanding again, the scraping plate 11d is rotatable around a fulcrum 11i of the intermediate portion, and the cam follower 11h is configured to run along a linear cam 11k installed along a orbit. The upper end portion k1 of the cam 11k is configured to rotate each scraping plate 11d clockwise by about 90 ° through the cam follower 11h. The lower end portion k2 of the cam 11k is formed in a concave shape so that the cam follower 11h is completely out of contact with the cam follower 11h. Is provided. Thus scraping board 1
1d maintains a substantially horizontal posture when ascending inside the casing 11c and exhibits maximum efficiency in transporting the excavated soil upward, and when descending outside the casing 11c, resists due to the sediment existing there. Thus, the operation of maintaining the posture to reduce as much as possible is realized. Also in the case of this soil transfer mechanism, the excavated soil above can be lowered to the cutter section by reversing the moving direction of the scraping plate 11d.

Further, the soil transfer mechanism 11 shown in FIGS.
Are fixed to the machine frame 2 in a horizontal direction at a predetermined pitch in a vertical direction, and a piston 11p driven by the hydraulic jack 11n moves vertically inside the casing 11m. This is a multi-stage piston type configuration in which the objects slide on the inner surface of the casing in a stacked state. The multi-stage piston 11p is driven by each hydraulic jack 11n into a variable displacement type with its stroke amount being shifted little by little as shown in FIG. 10, thereby sequentially transporting the excavated soil upward. invention).

However, by reversing the change in the shape of the variable volume of each piston, the excavated soil above can be lowered to the cutter. The hydraulic jack 11n shown in FIGS. 9 and 10 has a penetrating (double-acting) configuration in which the drive shaft protrudes to the left and right sides.
Since p is attached, it is a double-acting type that performs the soil-feeding action even when the drive shaft moves to the left or right, and is efficient.

Next, a deep ground improvement method implemented using the above-described deep ground improvement machine will be described.

First, the deep ground improvement method according to the invention described in claim 10 belongs to a penetration discharge method.
It can be carried out using the deep ground improvement machine described in claim 1.

Excavation is continuously performed to a predetermined large depth by a horizontal cutter 4 of a ground improvement machine suspended and supported by a wire rope 1 from a support tower or the like on the ground. Excavation can easily be a continuous operation only by operating the wire rope 1.
The vertical attitude of the ground improvement machine at the time of ground excavation
6 by remote control.

Simultaneously with excavation of the ground by the horizontal cutter 4, a ground stabilizing material such as cement slurry is injected from the lower slurry injection nozzle 8 into a position near the horizontal cutter 4, and this is used as a lubricant to efficiently excavate the ground. Proceed.
At the same time, the soil excavated by the horizontal cutter 4 is stirred and mixed with the ground stabilizing material, and the excavated soil muddy is excavated at a large depth while being successively transported upward from the horizontal cutter unit by the soil transfer mechanism 11. Do.

After excavating the ground vertically downward to a predetermined large depth, the injection of the ground stabilizing material is stopped, and the horizontal cutter 4 is rotated while raising the ground improvement machine by operating the wire rope 1. Then, the ground is improved by stirring and mixing again.

Next, the deep ground improvement method according to the eleventh aspect of the present invention belongs to the lifting discharge method and is carried out by the deep ground improvement equipment according to the second aspect.

That is, excavation is continuously performed to a predetermined large depth by a horizontal cutter 4 of a ground improvement machine suspended and supported by a wire rope 1 from a ground tower or the like. The vertical posture of the ground improvement machine at the time of ground excavation is performed by remote control of the posture control device 16.

Simultaneously with excavation of the ground by the horizontal cutter 4, water or bentonite muddy water or clay slurry is injected as a drilling lubricant from a lower slurry injection nozzle into a position near the horizontal cutter 4 to efficiently excavate the ground. .

The excavated soil excavated by the horizontal cutter 4 and mixed with water or bentonite muddy water or clay slurry to be muddy is excavated at a large depth while being successively transported upward from the horizontal cutter portion by the soil transfer mechanism 11. Do.

After excavating the ground to a predetermined large depth, the ground improvement machine is pulled up by the wire rope 1, and at the same time, cement slurry is injected from the upper slurry injection nozzle 13 as a ground stabilizer, and excavated by the stirring blade 14. Mix and stir with soil. The excavated soil that has been stirred and mixed in this way further improves the ground quality by adding stirring and mixing by rotating the horizontal cutter 4.

[0043]

According to the deep ground improvement machine according to the invention as set forth in claims 1 to 9, and the deep ground improvement method according to the inventions as set forth in claims 10 and 11, Regardless of the type of ground, the ground improvement can be improved efficiently, with high quality, and with the ground bearing capacity necessary to support the structure, contributing to expanding the scope of construction I do.

[Brief description of the drawings]

FIG. 1 is an elevation view showing an embodiment of a deep ground improvement machine according to the present invention.

FIG. 2 is a side view of the deep ground improvement machine.

FIG. 3 is a partial view showing an example of a different structure of the reamer plate.

FIG. 4 is a plan view taken along line 4-4 in FIG. 1;

FIG. 5 is a partial view showing a different embodiment of the soil transfer mechanism.

FIG. 6 is a plan view taken along line 6-6 of FIG. 5;

FIG. 7 is a partial view showing a scraping plate transfer mechanism.

FIG. 8 is a partial view showing a different embodiment of the soil transfer mechanism.

FIG. 9 is a plan view taken along line 9-9 of FIG. 8;

FIG. 10 is a plan view taken along line 10-10 of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire rope 2 Machine frame 3 Horizontal axis 4 Horizontal cutter 5 Driving means 8 Lower slurry injection nozzle 11 Earth feeding mechanism 12 Driving means 13 Upper slurry injection nozzle 14 Stirring blade 9 High pressure jet nozzle 4b Cutter blade 4a Cutter drum 7 Reamer plate 16 Posture Control device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akio Suzuki 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside the Technical Research Center, Takenaka Corporation (72) Inventor Yoshio Suzuki 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute (72) Inventor Satoshi Saito 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute (72) Inventor Toshio Hashiba 8-21 Ginza, Chuo-ku, Tokyo Address No. 1 Takenaka Corporation Tokyo Main Store (72) Inventor Minoru Suzuki 21-1, Ginza, Chuo-ku, Tokyo 21-1, Takenaka Engineering Co., Ltd. (72) Inventor Shoji Monaka 8-chome, Ginza, Chuo-ku, Tokyo 21-21 No.1 Takenaka Civil Engineering Co., Ltd. (72) Inventor Heizo Kojima 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd. Tetsushi Ma 1-21-21 Ginza, Chuo-ku, Tokyo, Japan Takenaka Civil Engineering Co., Ltd. (72) Inventor Yuichiro Hirose 1-6 Shioda-cho, Kochi City, Kochi Prefecture F-Term (in reference) 2D040 AB05 BA01 BB03 CA01 CB03 EA01 EB00

Claims (11)

[Claims] 1. A ground improvement machine for excavating a ground vertically to a large depth and injecting a ground stabilizing material into excavated soil and mixing with stirring, wherein a machine frame suspended and supported by a wire rope from the ground. The part comprises a horizontal cutter rotating around at least a pair of horizontal axes and its driving means, a lower slurry injection nozzle for injecting a ground stabilizer to a position near the horizontal cutter, A deep soil improvement machine, comprising: a soil transfer mechanism for transferring the cutter upward from a cutter unit; and a driving unit therefor. 2. A ground improvement machine for excavating a ground vertically to a large depth and injecting a ground stabilizing material into excavated soil at an original position at the time of lifting and stirring and mixing the ground, and supported by a wire rope suspended from the ground. A horizontal cutter rotating around at least a pair of horizontal axes and a driving means therefor, and a lower slurry injection nozzle for injecting water, bentonite muddy water or clay slurry to a position near the horizontal cutter. An agitating blade for transporting earth and sand excavated by the horizontal cutter upward from the cutter unit and a driving unit therefor; an agitating blade for agitating and mixing the ground stabilizer with the excavated soil; and a driving unit therefor; and the agitating blade. Characterized by being provided with an upper slurry injection nozzle located directly above the
Deep ground improvement machine. 3. The deep ground improvement machine according to claim 1, wherein a high-pressure jet nozzle for converting a slurry or the like into a high-pressure jet and injecting the slurry is installed instead of the lower slurry injection nozzle. 4. The cutter blades constituting the horizontal cutter are equally arranged on the same circumference on the outer circumference of the cutter drum, and are arranged on a plurality of circumferences allocated at a predetermined pitch in the axial direction of the cutter drum. The reamer plate is fixed to the lower part of the machine frame and is installed downward so as to penetrate sufficiently deep into each gap adjacent in the axial direction of the cutter blade. Or the deep ground improvement machine described in 2. 5. The reamer plate according to claim 4, wherein a pair of horizontal cutters are separately installed at a central portion where the excavated soil is scraped up or at both outer portions of the horizontal cutter. Deep ground improvement machine. 6. The deep ground improvement machine according to claim 1, wherein an attitude control device for controlling vertical accuracy of the ground improvement machine is installed on the machine frame. 7. The earthing mechanism has a twin screw conveyor configuration in which two screws are installed in parallel in a common casing in a mutually meshing relationship, and the two screws are rotated synchronously by a driving means. The deep ground improvement machine according to claim 1 or 2, wherein: 8. A soil transfer mechanism, wherein a plurality of scrapers, which are arranged to face each other in a common casing and move in the vertical direction, are wound around sprockets installed at upper and lower ends of the casing. The chain is driven by a driving means through a sprocket, and means for folding the scraping plate which has reached the sprocket at the upper end, and means for re-deploying the scraping plate which has descended in a folded state outside the casing. The deep ground improvement machine according to claim 1, wherein the ground improvement machine is provided. 9. A soil feeding mechanism, wherein a number of jacks arranged in a horizontal direction at a predetermined pitch in a vertical direction are fixed to a machine frame, and pistons driven by the jacks are vertically connected within a casing. 3. The multi-stage piston is driven by each jack with its stroke amount being shifted little by little by sliding the inner surface of the casing in a stepped state. Deep ground improvement machine. 10. A deep ground improvement method in which a ground is excavated vertically downward to a large depth, and a ground stabilizing material is injected into an excavated soil at an original position in parallel with the excavation penetration and mixed with stirring. Ground excavation is advanced to a specified large depth while injecting ground stabilizing material from the lower slurry injection nozzle to a position near the horizontal cutter of the ground improvement machine suspended and supported by a wire rope, and stirring and mixing of the ground stabilizing material and the excavated soil The excavated soil mixed with the ground stabilizing material is transported above the horizontal cutter unit by a soil sending mechanism.After excavating to a predetermined large depth, the injection of the ground stabilizing material is stopped and the wire rope is used. A deep ground improvement method characterized by performing ground improvement by stirring and mixing again with a horizontal cutter while raising the ground improvement machine. 11. A deep soil improvement method in which a ground is excavated vertically downward to a large depth, and a ground stabilizing material is injected into an excavated soil at an original position when the soil improvement machine is pulled up and agitated and mixed. Injecting water or bentonite muddy water or clay slurry from a lower slurry injection nozzle to a position near a horizontal cutter of a ground improvement machine suspended and supported by a wire rope, and proceeding with excavation of the ground to a predetermined large depth, excavating with the horizontal cutter Then, the excavated soil mixed with water or bentonite muddy water or clay slurry is transported above the horizontal cutter unit by a soil sending mechanism.After excavating to a predetermined large depth, the ground improvement machine is pulled up by the wire rope. While injecting ground stabilizing material from the upper slurry injection nozzle installed just above the stirring blade, And mixed and stirred with the cutting soil, and performing ground improvement by stirring and mixing again further in the horizontal cutter, deep ground improvement method.