JP2002188137A - Round improvement method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish a compaction construction method of an auger by one time execution work, to accomplish the function of a constructed structure by eliminating the fear of causing liquefaction, and to inexpensively and safely perform a ground improvement method with excellent working efficiency by reducing manhours. SOLUTION: An execution plant is introduced and set to the improving object ground, an infilling improving material 14 is inputted between an outside casing auger 9 erected along the leader 6 and a thrust screw 18 arranged inside, a high pressure fluid is injected, pressurized, and contracted toward the side from a delivery port 6 bored and formed in a tip part of the thrust screw 18, the infilling improving material filled by injecting, pressurizing and contracting a flexible seal bag arranged in a packer type in the delivery port 6 is compacted and fastened, an underground pile according to design is created, the seal bag 24 allows relative rotation to a rod 18 via a co-rotation preventive mechanism, and is not damaged by being fixed by the frictional force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology is intended to prevent the liquefaction phenomenon in the ground improvement work by replacing the conventional gravel drain method or compaction method in order to prevent the liquefaction phenomenon and increase the shear strength of the soft viscous ground. The strength and rigidity of the underground pile formed in the ground are greatly increased so as to enhance the function of increasing the strength of the soft ground and the like, and belong to the technical field of the ground improvement method technology in which the diameter is expanded.

[0002]

2. Description of the Related Art As is well known, in the territory of Japan, where the land is narrow and there are many mountain forests, and the terrain is in a special terrain that is approaching a complicated and long coastline, not to mention houses. However, the plains that can be effectively used for industrial facilities are extremely limited, and therefore, in order to provide effective use of the plains, improvement of soft ground by reclaiming or dredging rivers, lakes and shallow shores. Have been developed for a long time, and some of them have been put to practical use.

For example, a sand drain method, a gravel drain method, and the like have been put into practical use. However, in the conventional technique, when an underground pile is formed, the former method is to drill a hole in the ground and then fill the ground. However, the complexity of the work, which requires the application of a load, weakens the construction efficiency, and the latter can be verified only after encountering an actual earthquake. Has been replaced.

[0004] In order to utilize the ground improvement work of these conventional technologies, for example, Japanese Patent Application Laid-Open No. 53-84310 and Japanese Patent Application Laid-Open No. 3-5516 have been developed and proposed. In general, there was a problem that it was not possible to clear all of the presented problems basically.

[0005]

SUMMARY OF THE INVENTION The object of the invention of the present application is to carry out a ground improvement work in order to sufficiently cope with various problems of a soft ground such as consolidation settlement, sliding destruction, liquefaction phenomenon and the like based on the above-mentioned prior art. It is an object of the present invention to provide an excellent new ground improvement method and an apparatus used for the method, which are advantageous in the field of civil engineering technology in the construction industry while maintaining the property.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the construction of the invention of the present application having the above-mentioned claims according to the above objects is to press-fit an improved material into a ground to be improved via a casing. Then, after the press-fitting, the press-fitting material is repeatedly subjected to pressure shrinkage after the fluid high-pressure injection, thereby compressing the improved material pressed into the ground more firmly, repeating the honey-tightening, and pulling out the casing. In the ground improvement method to perform a predetermined drilling by the outer casing auger, and then discharge the filling material that has been charged into the casing auger to the ground with a thrust screw inside the casing auger, The casing auger is pulled upward while repeatedly discharging high-pressure fluid from the discharge port formed at the tip of the thrust screw for the discharged improved material, and the underground pile is placed in the ground. In addition, the improved material is press-fitted into the ground to be improved via a casing, and after the press-fitting, the press-fitting material is repeatedly subjected to high-pressure injection and pressure shrinkage of the fluid to be pressed into the ground. The improved material was compressed more firmly and expanded by repeating the honey-tightening, and directly used in the ground improvement method of pulling out the casing, a predetermined drilling was performed by the outer casing auger, Next, the filling material in the casing auger is discharged to the ground by the thrust screw inside the casing auger, and the discharged improvement material is discharged to the tip of the thrust screw inside the outer casing auger. While repeatedly discharging high-pressure fluid to the improvement material discharged from the inside of the casing auger through the attached flexible bag, the bag is connected to the rod. Another feature of the present invention is that the bag is disposed around the outlet, so that the bag is disposed on the rod in a sealed and sealed manner. Is provided with a technical means such that it is disposed on the rod via a co-rotation prevention device.

[0007]

When performing a new improvement work according to the invention of the present application, a hole is drilled at a predetermined depth from the outer casing auger in the area to be improved in the ground, and a predetermined depth is formed from the upper auger. The filling material is charged, and the filling material filled from the hopper is inserted between the thrust screw and the outer casing auger by a thrust screw axially mounted in the casing auger. And thrust screw plate at the tip of the thrust screw is forcibly filled with honey, and the drilling is performed by the thrust fins of the outer casing auger. A high pressure fluid such as air or water is pumped at a predetermined timing by a predetermined swivel joint connected to the upper part. The high pressure fluid is ejected from a discharge port provided at the tip of the rod, and the discharge of the high-pressure fluid is performed below the level of the groundwater. A rubber sheet material, an aramid fiber woven fabric, a high-strength polyethylene fiber {for example, Dyneema (registered trademark) manufactured by Toyobo Co., Ltd.}, a PBO (polyparaphenylene benzobis) Oxazole) fiber (for example, ZYLON (registered trademark) manufactured by Toyobo Co., Ltd.), a flexible elastic sheet such as a sheet material made of natural fiber hemp fabric, or the like is used as a balloon-shaped bag to form a water-tight bag. Use a bag coated with resin to improve airtightness, and penetrate into the ground of the lower thrust screw rod or in the filling material, or At the time of lifting, it is fixed by friction with the ground filling material and the ring-shaped steel band or rubber band as a discharge mechanism has a gap in a double structure etc. so that corotation does not occur In order to prevent the damage to the bag due to the co-rotation prevention by performing only the action of tightening the discharge pressure of the bag by enhancing the co-rotation prevention effect, it is performed cyclically at inside and outside frequency during the The tightening of the filled honey is strengthened, and the discharge of high-pressure fluid is repeatedly performed to prevent liquefaction, etc., through a single operation using a spiral plate or spiral fin, so that depth and noise are prevented. The construction is performed statically to prevent pollution to the surrounding environment, and the ground improvement work is performed efficiently and at low cost.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings as embodiments of the present invention.

Incidentally, the illustrated aspects are not exactly the same because the respective deformed aspects are deformed.

In the illustrated embodiment, gravel draining is performed as ground improvement work on soft ground. The filling material in the gravel drain includes sand, gravel, crushed stone, and the like.
It is needless to say that the present invention can be applied to not only gravel, concrete pieces, and industrial waste materials but also all kinds of improved materials.

In the embodiment shown in FIG. 1, reference numeral 1 denotes a plant used for a general method such as gravel drain,
The leader 6 erected from the head of the trolley 4 of the crawler 3 loaded and set in a predetermined low portion of the ground to be improved 2 is held upright by the back stay 5 and is suspended via a winch (not shown). 7 has a screw fin 10 for drilling on the outer periphery of the outer casing auger 9 via a sheave portion 8 provided at the top of the leader 6, and has a hopper 13 for filling and discharging the filling. , Sand, gravel, crushed stones,
It is designed to discharge and fill the filling discharge 14 such as gravel, concrete pieces, and industrial waste materials.

The screw fins 10 of the casing auger 9 are provided so as to be kneaded for drilling, and the tip of a thrust screw shaft mounted in the casing auger 9 described below. The discharge port 16 of the high-pressure fluid from the swivel joint 11 formed in the section is underground water level, and thus the construction plant 1 of FIG. 1 is a mode common to each embodiment described below.

First, in the first embodiment shown in FIGS. 2 to 5, a rod 18 having a thrust screw (not shown) at least at the front end is provided on the inner side of the casing auger 9 with a stopper flange up and down via a predetermined 3. 18
, 18 '', and a passage 20 for high-pressure fluid such as air or water from the swivel joint 11 at the center thereof. A discharge port 6 is provided at a predetermined portion between the stopper flanges 18 '', 18 ''. A cylinder 19 is fitted between the passage 20 and the rod 18 so as to be movable up and down, and a spring 21 is interposed between the step and the stopper flange 18 '.

In the embodiment shown in FIGS. 2 to 5 in which the high-pressure fluid 22 is sprayed under pressure from the discharge port 6 directly to the filling material 14, first, the screw fin 10 is formed by the outer casing auger 9. Through the hole 15
, And from the hopper 13, a filling material 14 such as sand, gravel, crushed stone, gravel, concrete pieces, industrial waste material, etc.
By the rod 18 of the inner thrust screw mounted on the casing auger 9, the filling material 14 is filled in the ground.
Discharge filling. This state is a state in which the high pressure fluid 22 from the discharge port 6 shown in FIG.

Next, a high-pressure fluid is pumped from the swivel joint 11 to move the cylinder 19 to the spring 21 so as to be lifted. Then, as shown in FIG. 4, the cylinder 19 is raised to the stopper flange 18 'to discharge. The outlet is opened, the high-pressure fluid 19 is supplied, and the high-pressure fluid 22 is ejected from the discharge port 6 to the filling material 14 discharged and filled as the high-pressure fluid 22, and the filling material 14 is contracted by being pressed tightly. To prevent the occurrence of liquefaction.

The rod 18 of the thrust screw is
Is rotated in the reverse direction to raise the casing a predetermined span together with the casing auger 9, and at the same time, stops the pressure feed of the high-pressure fluid 20 from the swivel joint 11, closes the discharge port in the state shown in FIG. Stop together to prevent backflow from the fine sand or silt discharge port.
In this manner, the compacting operation is repeated by directly injecting and compressing the high-pressure fluid 22 directly from the thrust screw rod 18 to the filling material 14 and discharging and filling the thrust screw rod 18 from the thrust screw rod 18. The pressurized tightening material 14 is directly pressed by the high-pressure fluid 22 by the high-pressure fluid 22 through pressurization and shrinkage. The phenomenon can be performed together, and the ground improvement work can be completed in one construction work.

It should be noted that the honey tightening effect due to the direct injection pressure shrinkage of the high-pressure fluid 22 to the discharged and filled filling material 14 is caused not only on the inner surface of the filled filling material 14 but also upward and obliquely. Naturally, the effect of the liquefaction prevention on the porosity of groundwater is extremely large, as a matter of course.

Then, when the casing auger 9 and the thrust screw rod 18 mounted inside the casing auger reach the bottom dead center by the spring 21 of the cylinder 19 when the rod 18 of the thrust screw is raised, the discharge port 6 is closed. Needless to say, the injection pressurization contraction timing of the high-pressure fluid 24 is intermittently performed.

Next, in a second embodiment shown in FIGS. 6 and 7, a thrust fin 23 is attached to a rod 18 of a thrust screw axially mounted inside the outer casing auger 9 at a larger pitch toward the lower side. In this embodiment, the rod 18 at the lowermost end of the screw fin 23 has a rubber sheet material, a woven fabric made of aramid fiber, and a high-strength polyethylene fiber (for example, Toyobo Co., Ltd.). Dyneema (registered trademark) II fabric made by the company, P
BO (polyparaphenylene benzobisoxazole) fiber (for example, ZYLON (registered trademark) manufactured by Toyobo Co., Ltd.), a sheet material made of natural fiber hemp material, etc. 24, which is provided with a resin coating to enhance liquidity and confidentiality, is mounted as a bag as a complete seal as a packer, is mounted with the discharge port 6 in between, and is mounted with an elastic seal. 24 allows the injection pressure contraction by the high-pressure fluid 22, but is tightened by a steel ring 24 so as to prevent corotation with the rod 18, and a rubber band 26 is attached to the steel ring 25. The elastic seal 24 is fitted and fitted so that it can rotate freely with a small gap.

In this embodiment, similarly to the above embodiment, the filling material 14 is discharged and filled into the ground 2 by the rod 18 of the inner thrust screw, and the high-pressure fluid 22 is discharged from the swivel joint 11 at a predetermined timing. When the elastic seal 24 is spray-pressed and contracted from the outlet 16 to spray-press and shrink the elastic seal 24 to expand and contract the seal bag 24, the inner filling is discharged and filled around the outlet 6 by the expanding and contracting jet port 6. The material 14 is compacted, the filling rate of pore water pressure is reduced, and the liquefaction prevention is effectively achieved by one ground improvement work by the compacting effect. The elastic seal bag 24 prevents the fine sand and silt from flowing back, and at the same time, inserts and compresses the filling material 14 into the spout 6 at the timing of pressurization, so that the elastic seal bag 24 is not damaged at all. In addition, the ring 21 and the band 26 for preventing the co-rotation can be easily separated from the elastic seal bag 2 by releasing the fastening screw 27.
4 can be freely changed.

Then, at a predetermined elevating span, the casing auger 9 and the rod 18 of the thrust screw are pulled out and transferred to the next underground pile construction.

The elastic seal bag 24 has sufficient flexibility and elasticity.

When the elastic seal bag 24 is contracted, a gap is formed between the elastic seal bag 24 and the filling material 14, and the filling material is dropped and filled in the gap to fill the next high pressure fluid. The honey is tightened by the injection pressure shrinkage.

The elastic seal bag 24 is prevented from rotating counterclockwise by the ring 25 or band 26 of the co-rotation preventing mechanism, and is allowed to rotate relative to the elastic seal bag 24. Therefore, the elastic seal bag 24 is not fixed to the filled filling material 14. Although damage and the like can be avoided, if there is a possibility that wear and damage will occur due to repeated construction over time, it is needless to say that the bolts and screws are replaced appropriately by an operator.

Then, as described above, the elastic seal bag 24
If the temporary construction does not cause much damage,
As shown in FIG. 8, it is possible to provide a bag by hanging the cantilever at the tip of the discharge rod without disposing the discharge port 6 of the rod 18 as a packer.
That is, as shown in FIGS. 9 (a), 9 (b) and 9 (c), the co-rotation preventing mechanism 25 is attached to the tip of the rod 18 of the thrust screw mounted on the inside of the outer casing auger 9 in the same manner as in the above embodiment. Through the elastic seal bag 2 similar to the above-described embodiment,
7 is suspended in an inflatable and contractible manner. First, the seal bag 27 is placed in the reduced posture and inserted into the borehole 14 to reduce the interstitial water of the filling material and suppress the liquefaction. The casing auger 9 is formed and the rod 18 of the thrust screw is pulled up at a certain timing. At this time, as shown in FIG. 9 (c), the elastic seal 27 of the bag is reduced due to the force of the pushing and the force of the filling material 14 to be pushed and filled. There is no obstacle to the resistance due to the friction with the improving material 14 filled therein.

The mechanism for supplying and discharging the high-pressure fluid to and from the cantilevered suspended elastic seal bag 27, as shown in FIG.
The high pressure fluid supply / discharge passages 19 and 29 'are provided in a double tube type inside the discharge passage 8, and the discharge passage 30 is appropriately connected to a bag filter or the like. In the supply passage 29, the rotary valve 30 is rotated as shown in FIG. The block-shaped granules 31 ', 31', 31 'are provided so as to be freely openable and closable while supplying a continuous high-pressure fluid 31, and are closed by rotating the rotary valve 2' during shut-off. In this state, when the supply of the high-pressure fluid 31 is started again, it is opened as shown in the upper part.

In this manner, even in the embodiment of FIG. 8 in which the elastic seal 2 is hung in a cantilever manner at the tip of the rod 18, the elasticity substantially provided in the arrangement shown in FIGS. Although the same honey-tightening effect by the same injection pressure shrinkage as the seal 27 is expected, functional destruction or the like due to liquefaction of the underground pile cannot be performed, but the embodiment shown in FIGS. Which one to use can be selected depending on the properties of the ground to be improved, the properties of the filling material, and the like.

Further, in the above-described configuration, various modes can be adopted, such as being selectively used and being able to be attached to both the tip portion and the middle portion of one inner thrust screw. .

In any of the embodiments, the action effect of the honey compaction by the injection and contraction of the high-pressure fluid from the discharge port appears not only laterally but also obliquely in the vertical direction. The effect of preventing liquefaction is uniform and the effect of preventing liquefaction appears once in the ground improvement work in the entire underground pile and the improvement area of the ground. Needless to say, as for the filling improving material to be used, not only sand, gravel, crushed stone, gravel, concrete pieces, and industrial waste material used for gravel drains and the like but also any improving material can be used.

[0030]

As described above, according to the invention of this application, while the compaction method is used for the improvement of the ground, the consolidation of the underground pile formed in the ground is more reliably performed. Therefore, a predetermined function such as a ground structure is constantly maintained, and an excellent effect that the ground improvement work does not have to be performed every time liquefaction occurs is exhibited.

In addition, since the liquefaction prevention device can be brought out in a single ground improvement work, there is an excellent effect that the work accuracy is uniformly performed as designed in all regions.

In order to compress the high pressure fluid to the discharge port provided in the rod of the internal thrust screw through the swivel joint to exert the compaction by the injection pressurization contraction, a point below the level of the groundwater is used. As a result, vibration and noise due to the vibro-hammer are not generated, and the construction is performed quietly, so that an excellent effect is exerted that no adverse effects due to vibration such as noise pollution are exerted on the periphery of the construction work.

In addition, the packer type around the discharge port or the elastic seal bag hung at the tip can be smoothly loaded and unloaded to and from the filled filling improving material, so that there is no damage due to sticking. Is also played.

The diameter of the underground pile formed in the ground does not expand beyond the diameter of a steel pipe such as a rod installed in the ground, and the supporting force is sufficiently large because the improved material is compacted. There is no effect that it can not be expected, and there is also an effect that underground piles by compaction method can be reliably created as designed.

The underground pile formed by the invention of this application can be formed by using various improved materials as compared with the material by the conventional construction method, and has a larger diameter than the conventional underground pile. There is also an effect that the underground pile can be created.

Further, since the bag material used has a structure in which several fibers having high durability against the jetting force of the fluid and the frictional force are laminated, a strong frictional force is generated even by improving the rod. There is also an advantage that it is not easily broken by the co-rotation prevention mechanism even by the frictional force generated.

In addition, the use of the co-rotation prevention mechanism keeps the spiral plate always oriented in a predetermined direction irrespective of the rotation of the rod, thereby improving the durability of the seal bag. is there.

[0038]

[Brief description of the drawings]

FIG. 1 is a schematic schematic partial cross-sectional side view of a construction plant of the present invention.

FIG. 2 is a half cross-sectional view of a state of being ejected only by a discharge port without a bag attached.

FIG. 3 is a half sectional view immediately before ejection.

FIG. 4 is a half sectional view immediately after ejection.

FIG. 5 is a half sectional view immediately before the end of ejection.

FIG. 6 is a partial half sectional view of the same.

FIG. 7 is an enlarged half sectional view of the same.

FIG. 8 is a partially enlarged side view in which a bag is attached to a distal end.

FIG. 9 is an image diagram of a compaction process using a bag suspended at the rod tip, in which (a) is a schematic diagram before the bag is inflated, (b) is when the bag is inflated, and (c) is a schematic cross section when the bag is contracted. It is a side view.

FIG. 10 is a cross-sectional view of the same high pressure fluid supply and discharge state.

FIG. 11 is an operation schematic diagram of the loader valve.

[Explanation of symbols]

 2 Ground to be improved 14 Improvement material 9 Casing 22 High pressure fluid 18 Rod 15 Drilling hole 6 Discharge port 17 Bag (elastic seal) 19, 29 'Passage 6 Leader

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keiji Inaba Nippon Kaiko Co., Ltd., 119 Ito-cho, Chuo-ku, Kobe, Hyogo Japan (72) Inventor Takuya Kaizu 119 Ito-cho, Chuo-ku, Kobe, Hyogo (72) Inventor Naoto Nishida 119, Ito-cho, Chuo-ku, Kobe, Hyogo Japan Nippon Kaiko Co., Ltd. (72) Inventor Kiyoharu Kuji 119, Ito-cho, Chuo-ku, Kobe, Hyogo Nippon Marine Engineering ( 72) Inventor Masahiro Hattori 119, Ito-cho, Chuo-ku, Kobe-shi, Hyogo F-term (reference) 2D043 CA06 DA05 DA07 DD18 DD20 EA01 EA02 EA04 EB04 EB06

Claims (4)

[Claims] 1. An improved material is press-fitted into a ground to be improved via a casing, and after the press-fitting, the press-fitting material is repeatedly subjected to high-pressure fluid injection and pressurized shrinkage to further strengthen the improved material pressed into the ground. In the ground improvement method of repeatedly compressing and consolidating the honey and pulling out the casing, a predetermined drilling is performed by an outer casing auger, and then the casing auger is screwed with a thrust screw inside the casing auger. The filling material is discharged into the ground, and the casing auger is pulled upward while repeatedly discharging high-pressure fluid from the discharge port formed at the tip of the thrust screw with respect to the discharged improving material. A ground improvement method, wherein an underground pile is formed in the ground. 2. The improved material is press-fitted into the ground to be improved via a casing, and after the press-fitting, the high-pressure injection and contraction of the fluid is repeatedly performed on the press-fitted material to further strengthen the improved material pressed into the ground. In a device directly used for the soil improvement method of compressing and expanding the diameter by repeatedly tightening the honey and pulling out the casing, a predetermined drilling is performed by an outer casing auger, and then the casing auger is removed. The filling material in the casing auger is discharged to the ground by the internal thrust screw, and the discharged improvement material is attached to the tip of the thrust screw inside the outer casing auger. The casing auger is pulled out while the high-pressure fluid is repeatedly discharged to the improved material discharged from the inside of the casing auger through the bag to form the underground pile into the ground. An apparatus for direct use in methods such that, soil improvement apparatus characterized in that said bag is disposed around the discharge port of the rod. 3. The ground improvement apparatus according to claim 2, wherein the bag is disposed on the rod in a sealed manner and is sealed. 4. The ground improvement device according to claim 2, wherein the bag is disposed on the rod via a co-rotation preventing device.