KR101722198B1 - Anchoring apparatus - Google Patents

Anchoring apparatus Download PDF

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Publication number
KR101722198B1
KR101722198B1 KR1020150105351A KR20150105351A KR101722198B1 KR 101722198 B1 KR101722198 B1 KR 101722198B1 KR 1020150105351 A KR1020150105351 A KR 1020150105351A KR 20150105351 A KR20150105351 A KR 20150105351A KR 101722198 B1 KR101722198 B1 KR 101722198B1
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KR
South Korea
Prior art keywords
anchor body
grout
outside
perforating gun
seabed
Prior art date
Application number
KR1020150105351A
Other languages
Korean (ko)
Other versions
KR20170011900A (en
Inventor
임인규
김현수
서종무
안광현
여정환
전상배
최정인
Original Assignee
삼성중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1020150105351A priority Critical patent/KR101722198B1/en
Publication of KR20170011900A publication Critical patent/KR20170011900A/en
Application granted granted Critical
Publication of KR101722198B1 publication Critical patent/KR101722198B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • B63B21/27—Anchors securing to bed by suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • B63B21/28—Anchors securing to bed driven in by explosive charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/38—Anchors pivoting when in use
    • B63B21/44—Anchors pivoting when in use with two or more flukes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E02D5/806—Ground anchors involving use of explosives
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E02D5/808—Ground anchors anchored by using exclusively a bonding material
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/30—Miscellaneous comprising anchoring details

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

An anchoring device is disclosed. The anchoring device according to one aspect of the present invention includes an anchor body penetrated into a seabed ground, a perforation mounted inside the anchor body to generate an explosion directed outward from the inside of the anchor body, and to form a discharge hole on at least one surface of the anchor body. And a grout storage tank disposed inside the anchor body to discharge the grout to the outside of the anchor body through the perforating gun and the discharge hole.

Description

ANCHORING APPARATUS

The present invention relates to an anchoring device.

To collect marine resources such as crude oil or natural gas, a variety of offshore structures are built onshore. These marine structures float on the sea, so it is necessary to restrict the movement or fix the position of the marine structure, and accordingly, the foundation for supporting the marine structure is installed on the submarine ground.

The bases supporting marine structures can be classified in various ways according to the installation method. The foundation pile (or anchor) to be installed in the seabed can be classified into a driven pile, a suction pile, or a drop pile depending on the method of penetrating the submarine ground.

Since the foundation pile that is intruded into the seabed to support the offshore structure is installed in the water, construction time and cost can be considerable depending on the depth of the foundation pile or the characteristics of the seabed ground.

Open Patent Publication No. 10-2014-0137571 (published on December 03, 2014)

Embodiments of the present invention are intended to provide an anchoring device capable of improving the pull-out support force.

According to an aspect of the present invention, there is provided an anchor body which is inserted into an underside ground, a perforating gun mounted inside an anchor body to generate an explosion directed from the inside to the outside of the anchor body and to form an ejection hole on at least one surface of the anchor body a perforating gun, and a grout storage tank disposed inside the anchor body to discharge the grout to the outside of the anchor body through the discharge hole.

The apparatus may further include a pressure tank coupled to the grout storage tank to provide the discharge pressure of the grout.

The anchor body may include a hollow portion formed therein and a suction pump for discharging the fluid of the hollow portion to the outside to decompress the hollow portion, so that the anchor body may be introduced into the seabed by the pressure difference between the inside and the outside.

And a control unit for controlling operation of the perforating gun depending on whether the anchor body is intruded into the seabed ground.

In addition, the anchor body can be penetrated into the seabed by the falling method.

And a trigger line coupled to the anchor body and the anchor body to be coupled to the anchor body so as to be unfolded by friction with the surrounding ground by pulling the mooring line connected to the anchor body and to which tension is applied as the cover portion is unfolded .

At this time, the perforating gun can be operated when the magnitude of the tension applied to the trigger line is equal to or larger than a predetermined value.

The stopper unit may further include a stopper portion protruding outward from the anchor body so as to limit the angle of unfolding of the cover portion with respect to the anchor body.

According to the embodiments of the present invention, since the perforating gun is mounted inside the anchor body to form the discharge hole in the anchor body and the grout storage tank discharges the grout to the outside of the anchor body through the discharge hole, The holding force of the anchoring device can be improved by increasing the bearing capacity of the anchoring body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view of an anchoring apparatus according to an embodiment of the present invention; FIG.
2 is a view showing an anchor body formed with discharge holes in the anchoring device shown in Fig.
3 is a view showing a state in which the grout is discharged to the outside of the anchoring device shown in Fig.
4 is a perspective view showing an anchoring apparatus according to another embodiment of the present invention.
Fig. 5 is a view showing a state in which the anchoring apparatus shown in Fig. 4 is introduced into a seabed ground; Fig.
Fig. 6 is a view showing a state in which the cover portion of the anchoring device shown in Fig. 5 is deployed. Fig.
7 is a view showing a state in which the grout is discharged to the outside of the anchoring device shown in Fig.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, when a component is referred to as "comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise. Also, throughout the specification, the term "on" means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction.

In addition, the term " coupled " is used not only in the case of direct physical contact between the respective constituent elements in the contact relation between the constituent elements, but also means that other constituent elements are interposed between the constituent elements, Use them as a concept to cover each contact.

The sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment of an anchoring apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, A duplicate description will be omitted.

1 is a view showing an anchoring apparatus according to an embodiment of the present invention.

Referring to FIG. 1, an anchoring apparatus 100 according to an embodiment of the present invention includes an anchor body 110, a perforating gun 120, and a grout storage tank 130, And a pressure tank which is connected to supply the discharge pressure of the grout.

The anchor body 110 is a part forming the overall appearance of the anchor apparatus 100 according to the present embodiment. The anchor body 110 is penetrated into the seabed ground S so as to restrict the movement of the marine structures floating on the sea, Respectively.

The anchor body 110 can be supported in the seabed ground S by being penetrated into the seabed ground S and being frictioned with the surrounding ground and the marine structure or ship can be supported on the mooring line The anchor body 110 can receive the fixing force or the supporting force.

The structure and shape of the anchor body 110 may vary depending on the manner in which the anchor body 110 is penetrated into the seabed ground S. For example, when the anchor body 110 penetrates into the seabed ground S by striking the anchor body 110, the anchor body 110 can be formed of a tubular member.

As shown in FIG. 1, when the anchor body 110 is penetrated into the subsoil S by the suction pressure, that is, the pressure difference generated between the inside and the outside of the anchor body 110, S, the anchor body 110 may be formed in a cylinder shape. In this case, the anchor body 110 may include a hollow portion 112 and a hollow portion 112 formed in the anchor body 110 And a suction pump for discharging the compressed air to the outside of the hollow portion 112 to reduce the pressure of the hollow portion 112.

Also, the structure and shape of the anchor body 110 may vary depending on the characteristics of the seabed ground S into which the anchor body 110 is introduced. That is, the overall size (length or diameter) of the anchor body 110 may vary depending on whether the seabed ground S into which the anchor body 110 is penetrated is a hard ground such as a rock or a soft ground.

FIG. 2 is a view showing an anchor body formed with discharge holes in the anchoring apparatus shown in FIG. 1, and FIG. 3 is a view showing a state in which grout is discharged to the outside of the anchoring apparatus shown in FIG.

1 to 3, a perforating gun 120 generates an outwardly directed explosion from the inside to the outside of the anchor body 110 to form discharge holes 115 on at least one surface of the anchor body 110 And is mounted inside the anchor body 110 so that it is possible.

The perforating gun 120 is configured to be operated according to an externally applied signal and the signal is applied to the perforating gun 120 after the anchor body 110 is penetrated into the seabed ground S, The gun 120 is operated accordingly to form the discharge hole 115 on at least one surface of the anchor body 110.

The perforating gun 120 may generate various types of explosions such as a chemical explosion or an electrical explosion. The explosion generates shock waves directed from the inside to the outside of the anchor body 110. An ejection hole 115 penetrating the inside and the outside of the anchor body 110 due to shock waves transmitted to one surface of the anchor body 110 may be formed.

The perforating gun 120 may be configured in various manners, but it may be constituted by attaching a capsule-like explosive to a tubular member. A plurality of capsules may be attached to the tubular member so as to be spaced apart from each other. An explosion may occur in each capsule, and a discharge hole 115 may be formed on one surface of the anchor body 110 at a position corresponding to each capsule.

The number and position of the discharge holes 115 formed in the anchor body 110 can be adjusted by adjusting the arrangement of the perforating gun 120 and the power of the shock wave generated by the perforating gun 120 . 1 to 3, when the anchor body 110 is formed in a cylindrical shape in which a hollow portion 112 is formed, the perforating gun 120 is formed in the anchor body 110 And may be installed on the inner peripheral surface of the hollow portion 112.

The shock wave generated by the perforating gun 120 forms a discharge hole 115 on one surface of the anchor body 110 and reduces the compactness of the ground material existing around the anchor body 110 . The density of the surrounding ground of the anchor body 110 is reduced, so that the grouting can be easily performed, which will be described later.

The grout storage tank 130 discharges the grout G to the outside of the anchor body 110 through the discharge hole 115 formed on one surface of the anchor body 110 due to the operation of the perforating gun 120 And is disposed inside the anchor body 110. The grout G is stored in the grout storage tank 130 and the grout G may include cement paste, cement mortar, asphalt, and a chemical solution.

The grout G discharged to the outside of the anchor body 110 can cement the surrounding ground of the anchor body 110 to increase the holding force of the ground itself to improve the supporting force of the anchor body 110, 110 and the anchor body 110 can be integrated to secure a more rigid supporting force. Thus, the anchor body 110 penetrated into the seabed ground S can be more firmly fixed or supported in the ground, and the overall pulling support force of the anchoring apparatus 100 can be improved.

1 and 2, the grout storage tank 130 may be disposed above the anchor body 110. In this case, the grout G stored in the grout storage tank 130 may be gravity To the outside of the anchor body 110.

The grout storage tank 130 discharges the grout G stored therein to the outside through the discharge hole 115 and is not operated until the discharge hole 115 is formed in the anchor body 110. [ After the anchor body 110 is inserted into the seabed ground S and the discharge hole 115 is formed in the anchor body 110 by the perforating gun 120, the grout storage tank 130 is opened and the anchor body The grout G can be discharged to the outside.

3, a connection pipe 135 for guiding the grout G to the discharge hole 115 may be coupled to the grout storage tank 130, and the grout storage tank 130 and the connection pipe 135 may be connected to each other. A valve may be provided between the grooves G to adjust the flow of the grout.

The grout storage tank 130 is disposed above the anchor body 110 so that the grout G can be discharged by gravity. However, the arrangement of the grout storage tank 130 is not limited thereto It does not. The arrangement of the grout storage tank 130 may vary, and in this case, a pressure tank may be coupled to the grout storage tank 130 to provide the discharge pressure of the grout G. [

The anchor body 110 of the anchoring device 100 according to the present embodiment is formed by depressurizing the hollow portion 112 and the hollow portion 112 formed in the inner portion of the anchor body 110, Including a suction pump that forms a pressure difference between the inside and the outside, and can be introduced into the seabed ground S by a pressure difference between the inside and the outside.

In this case, the control unit may further include a control unit for controlling the operation of the perforating gun 120 depending on whether the anchor body 110 is penetrated to the seabed ground S or not. That is, the controller senses whether or not the anchor body 110 is intruded, determines whether the intrusion is completed, and applies a signal to the percolating gun 120. The control unit may control the opening and closing of the valve so as to open the grout storage tank 130 after the discharge hole 115 is formed on one surface of the anchor body 110 by the perforating gun 120.

FIG. 4 is a perspective view showing an anchoring apparatus according to another embodiment of the present invention, and FIG. 5 is a view showing a state where the anchoring apparatus shown in FIG. 4 is inserted into a seabed ground.

4 and 5, an anchoring apparatus 200 according to the present embodiment includes an anchor body 210, a perforating gun 220, and grout 220, similar to the anchoring apparatus 100 according to the above- And a storage tank (230). The anchor apparatus 200 according to the present embodiment may further include a cover portion 211 and a trigger line 212 and may further include a stopper portion 213.

The anchoring apparatus 100 according to the embodiment described with reference to FIGS. 1 to 3 and the anchoring apparatus 200 according to the present embodiment are different from each other in the manner of being penetrated into the seabed. Here, the overlapping description with the anchoring device 100 described above with reference to Figs. 1 to 3 will be omitted.

The anchor body 210 according to the present embodiment is introduced into the seabed ground S by a falling method. That is, the anchor body 210 drops at a position spaced apart from the bottom of the sea floor by a predetermined height, and the height difference between the bottom of the sea floor and the starting point of dropping of the anchor body 210 and the weight of the anchor body 210, . ≪ / RTI >

The supporting force can be improved as the anchor body 210 penetrated deeply into the seabed ground S by the falling method. The weight of the anchor body 210 can be designed to be heavy so as to improve the tube input of the anchor body 210 due to the drop and the resistance force (caused by friction with the sea water) applied to the anchor body 210 during the drop The anchor body 210 may be formed in a torpedo shape or the like that receives less resistance in the fluid. Further, the shape of the tip end portion can be formed to be tapered so as to improve the penetration force to the seabed ground S.

5, the perforating gun 220 generates an explosion directed from the inner side to the outer side of the anchor body 210 to form an anchor body 210 so as to form a discharge hole on at least one surface of the anchor body 210, And the grout storage tank 230 is disposed inside the anchor body 210 to discharge the grout to the outside of the anchor body 210 through the discharge hole formed by the perforating gun 220.

FIG. 6 is a view showing a state in which the cover portion of the anchoring device shown in FIG. 5 is opened, and FIG. 7 is a view showing a state in which the grout is discharged to the outside of the anchoring device shown in FIG.

5 to 7, the cover portion 211 is coupled to the anchor body 210 by being pulled by the mooring line 50 connected to the anchor body 210 so as to spread by friction with the surrounding ground. 5, the cover portion 211 is inserted into the seabed sole S in a folded state with respect to the anchor body 210. However, as shown in Fig. 6, When the line 50 is pulled, the cover portion 211 is unfolded while the material in the ground penetrates between the cover portion 211 and the anchor body 210.

The trigger line 212 is connected to the anchor body 210 and the cover portion 211 so that the tension is applied as the cover portion 211 is unfolded. That is, both ends of the trigger line 212 are connected to the anchor body 210 and the cover portion 211, respectively, and the cover portion 211 is unfolded and distanced from the anchor body 210 so that tension is applied to the trigger line 212 .

When the tension applied to the trigger line 212 is equal to or greater than a preset value, the perforating gun 220 is operated to form a discharge hole on one surface of the anchor body 210. That is, the perforating gun 220 is configured to start operation when a signal is applied, and the actuating signal of the perforating gun 220 in this embodiment may be the magnitude of the tension applied to the trigger line 212 .

7, when the discharge hole is formed in the anchor body 210 by the perforating gun 220, the grout G stored in the grout storage tank 230 through the discharge hole is discharged to the outside As shown in Fig. At this time, a connection pipe for guiding the grout G discharged from the grout storage tank 230 to the discharge hole may be installed in the anchor body 210.

The grout G discharged to the outside of the anchor body 210 can improve the supporting force of the anchor body 210 by increasing the holding force of the ground itself by cementing the surrounding ground of the anchor body 210, 210 and the anchor body 210 can be integrated to secure a more rigid supporting force. Thus, the anchor body 210 penetrated into the seabed ground S can be more firmly fixed or supported in the ground, and the overall pulling support force of the anchoring device 200 can be improved.

In addition, the anchoring device 200 can improve the pull-out supporting force as the area in contact with the ground in the ground is larger. Since the anchorage device 200 according to the present embodiment is inserted into the seabed ground S and the cover portion 211 is unfolded to increase the contact area in the ground, the pulling support force of the anchoring device 200 can be further improved .

Accordingly, the anchor apparatus 200 according to the present embodiment may further include a stopper 213 to maximize the overall area of the anchor apparatus 200 contacting the seabed ground S. The stopper portion 213 protrudes to the outside of the anchor body 210 so as to limit the angle of expansion of the cover portion 211 with respect to the anchor body 210 and the cover portion 211 211).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

50: Mooring line 100, 200: Anchoring device
110, 210: anchor body 112: hollow
115: discharge hole 120, 220: perforating gun
130, 230: grout storage tank 135, 235: connecting pipe
211: cover part 212: trigger line
213: stopper portion G: grout
S: Submarine ground

Claims (8)

Anchor body penetrated into the seabed;
A perforating gun mounted inside the anchor body to generate an explosion from the inside to the outside of the anchor body to form a discharge hole on at least one surface of the anchor body; And
And a grout storage tank disposed inside the anchor body to discharge the grout to the outside of the anchor body through the discharge hole,
Wherein the anchor body includes:
A hollow portion formed in the inside; And
And a suction pump for discharging the fluid of the hollow portion to the outside to reduce the pressure of the hollow portion, wherein the pressure pump penetrates into the seabed ground by a pressure difference between the inside and the outside. The method according to claim 1,
And a pressure tank coupled to the grout storage tank to provide the discharge pressure of the grout. delete The method according to claim 1,
And a controller for controlling the operation of the perforating gun according to whether the anchor body is intruded into the seabed ground. delete Anchor body penetrated into the seabed;
A perforating gun mounted inside the anchor body to generate an explosion from the inside to the outside of the anchor body to form a discharge hole on at least one surface of the anchor body;
A grout storage tank disposed inside the anchor body to discharge the grout to the outside of the anchor body through the discharge hole;
A cover part coupled to the anchor body so as to be unfolded by friction with the surrounding ground by pulling a mooring line connected to the anchor body; And
And a trigger line connected to the anchor body and the cover portion and to which tension is applied as the cover portion is unfolded,
Wherein the perforating gun operates when the magnitude of the tension applied to the trigger line is equal to or greater than a predetermined value. The method according to claim 6,
Wherein the anchor body is introduced into the bottom of the seabed by a falling method. The method according to claim 6,
Further comprising a stopper portion protruding outwardly of the anchor body to limit an angle of unfolding of the cover portion with respect to the anchor body.
KR1020150105351A 2015-07-24 2015-07-24 Anchoring apparatus KR101722198B1 (en)

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Publication number Priority date Publication date Assignee Title
CN107600372A (en) * 2017-09-04 2018-01-19 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） Manned underwater vehicle is sat from bottom support meanss
CN109956007B (en) * 2017-12-26 2021-01-26 中国船舶重工集团公司七五〇试验场 Anchor for generating underwater suction force based on chemical reaction
CN113734358B (en) * 2020-05-27 2023-03-31 中国石油化工股份有限公司 Deep sea natural gas hydrate suction anchor mechanism and installation method
CN113232772B (en) * 2021-05-10 2022-11-29 江苏科技大学 Octopus-imitated anchoring and positioning device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL301137A (en) * 1963-01-10
JPS60144382A (en) * 1983-12-31 1985-07-30 Kyokado Eng Co Ltd Grouting method and grouting apparatus
JPS61211417A (en) * 1985-03-14 1986-09-19 Kumagai Gumi Ltd Grouting method and device
JPH05178275A (en) * 1992-01-07 1993-07-20 Makoto Nishio Structure of corrugated pipe for anchor
KR20140137571A (en) 2013-05-23 2014-12-03 박민서 Grouting pile and method for reinforceing ground using thereof

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