JP2663021B2 - Ground improvement method by sand pile formation ship - Google Patents
Ground improvement method by sand pile formation shipInfo
- Publication number
- JP2663021B2 JP2663021B2 JP17318989A JP17318989A JP2663021B2 JP 2663021 B2 JP2663021 B2 JP 2663021B2 JP 17318989 A JP17318989 A JP 17318989A JP 17318989 A JP17318989 A JP 17318989A JP 2663021 B2 JP2663021 B2 JP 2663021B2
- Authority
- JP
- Japan
- Prior art keywords
- sand pile
- mound
- sand
- ship
- hollow tube
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Description
【発明の詳細な説明】 （イ）技術分野 本発明は、海底地盤の地盤改良工法に関し、詳しくは
砂杭は勿論のこと、砂杭造成船を使用してマウンドの造
成やその締固め均し作業をも行なう高能率な方法を提供
するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a method for improving the ground of a seabed, and more particularly, to mound formation and compaction using sand pile formation ships as well as sand piles. It provides a highly efficient way to do the work.
（ロ）従来技術 近年、海洋空間の高度利用の見地から、港湾構造物は
沖合へ展開し、大水深，大規模化の傾向にあり、その施
工条件は益々厳しいものとなっており、従来からの潜水
夫による作業では能率や安全性，経済性などの点から問
題が多く、各種の水中作業機械の開発や効果的な工法の
開発が望まれている。(B) Conventional technology In recent years, from the viewpoint of advanced utilization of marine space, harbor structures have been developed offshore, tending to be deeper and larger, and their construction conditions have become increasingly severe. There are many problems with divers in terms of efficiency, safety, economy, etc., and the development of various underwater working machines and the development of effective construction methods are desired.
一般に、港湾構造物等を軟弱地盤上に構築する場合、
海底地盤にあらかじめ砂杭を造成して軟弱地盤を強化し
た上で、マウンドを造成して荷重を分散させる方法が採
られる。Generally, when constructing port structures on soft ground,
Sand piles are formed on the seabed in advance to strengthen the soft ground, and then mounds are formed to disperse the load.
この場合、マウンドはコンクリートブロックや重錘等
をクレーン船で吊上げ自然落下させて締固めていたが、
海水抵抗や浮力及び着底時のウォータークッション等に
よりエネルギーが大幅に減少してしまい、更には位置ず
れなどを起して充分な効果が得られない。In this case, the mound lifted concrete blocks and weights with a crane ship and allowed them to fall naturally and compacted them.
Energy is greatly reduced due to seawater resistance, buoyancy, a water cushion at the time of landing, etc., and furthermore, a positional shift or the like is caused, so that a sufficient effect cannot be obtained.
また、例えば特開昭58−26109号公報のような軟弱地
盤の締固め工法等も提案されているが、該法はロッドの
一端を海面上に露出させクレーン船等に設置したハンマ
ーで打撃又は振動を与えて海底の軟弱地盤を締固める方
法であり、締固め材料の運搬・投入等を別個に行なわな
ければならなず、非常に非能率的である。Further, for example, a method of compacting soft ground as disclosed in Japanese Patent Application Laid-Open No. 58-26109 has also been proposed. In this method, one end of a rod is exposed on the sea surface and a hammer installed on a crane ship or the like is used for impact or impact. This is a method of compacting the soft ground on the seabed by applying vibration, and the transportation and introduction of compaction material must be performed separately, which is very inefficient.
（ハ）発明の開示 本発明は上記のような従来の問題点に鑑み、砂杭造成
船を使用して、必要な材料を砂杭造成用中空管を介して
投入し、砂杭の造成からマウンドの築造ならびにその締
固め均し作業を同一の機械で連続して施工でき、かつ高
能率，高精度の施工が可能な地盤改良工法を提案するも
のである。(C) DISCLOSURE OF THE INVENTION In view of the above-mentioned conventional problems, the present invention uses a sand pile forming ship, and inputs necessary materials through a hollow pipe for sand pile formation to form a sand pile. The present invention proposes a ground improvement method capable of continuously constructing and compacting a mound from the same machine using the same machine, and enabling highly efficient and accurate construction.
本発明工法の第１の特徴は、従来もっぱら砂杭造成の
ために使用されて来た作業船を使用し、砂杭造成用の中
空管下端に海底地盤を締固めて均すためのタンパー（突
固め板）を着脱自在に取付け、該中空管上部に設けられ
たホッパーから締固め均し材料を該中空管内へ投入して
上記中空管下端から海底へ排出散布し、中級管頭部に取
付けられたバイブロハンマーの振動によって均し材料を
締固め均すことにある。The first feature of the method of the present invention is that a work boat conventionally used exclusively for sand pile formation is used, and a tamper for compacting the seabed ground at the lower end of the hollow pipe for sand pile formation is leveled. (Compacting plate) is detachably mounted, and a compacting material is put into the hollow tube from a hopper provided on the upper portion of the hollow tube, and is discharged from the lower end of the hollow tube to the sea bottom to be sprayed. Compaction of the leveling material by the vibration of a vibrohammer attached to the part.
また、第２の特徴は、この砂杭造成船により海底の軟
弱地盤に通常の砂杭を造成した後、更に該地盤上に強固
なマウンドを造成するもので、この場合に砂杭造成用中
空管の下端部にマウンドを締固め均すためのタンパーを
装着し、上記中空管の上部に取付けたホッパーからマウ
ンド造成並びに締固め均し材料を中空管内へ投入し、こ
れを中空管下端から地盤上に排出してマウンドを造成す
ると共に、該マウンドを中空管頭部に取付けられたバイ
ブロハンマーの振動により締固め均すことである。The second feature is that after the ordinary sand pile is formed on the soft ground on the seabed by the sand pile formation ship, a solid mound is further formed on the ground. A tamper for compacting and leveling the mound is attached to the lower end of the empty tube, and a mound is formed from the hopper attached to the upper portion of the hollow tube and the material for compaction is poured into the hollow tube. The mound is formed by discharging the mound from the lower end onto the ground, and the mound is compacted by the vibration of a vibrohammer attached to the head of the hollow tube.
次に、本発明法の一実施例を図面により説明する。 Next, an embodiment of the method of the present invention will be described with reference to the drawings.
（ニ）実施例 第１図は本発明法を実施する装置全体の一例を示すも
ので、砂杭造成船１には上部にホッパー３を設けた砂杭
造成用中空管４が船１上に立設したリーダー６に沿って
昇降自在に吊下げられており、更に船１上には該中空管
４を昇降させるためのウインチ７やワイヤーロープ８と
共に、サンドビン9,ベルトコンベヤ10,グランドホッパ
ー11,バケット12等の搬送装置類が装備されている。(D) Embodiment FIG. 1 shows an example of the entire apparatus for carrying out the method of the present invention. A sand pile forming ship 1 is provided with a sand pile forming hollow tube 4 provided with a hopper 3 on the upper part of the ship 1. Is suspended along a leader 6 erected in a ship, and a sand bin 9, a belt conveyor 10, a ground, together with a winch 7 and a wire rope 8 for raising and lowering the hollow tube 4 on the ship 1. Transport devices such as a hopper 11, a bucket 12, and the like are provided.
上記中空管４の頭部にはバイブロハンマー２が取付け
られており、該中空管４は滑車13を介してワイヤーロー
プ８に懸吊され、ウインチ７の駆動により昇降するよう
に構成されている。A vibratory hammer 2 is attached to the head of the hollow tube 4. The hollow tube 4 is suspended from a wire rope 8 via a pulley 13, and is configured to move up and down by driving a winch 7. I have.
そして、中空管４下端外周にはタンパー５（突固め
板）が着脱自在に取付けられる。A tamper 5 (compacting plate) is detachably attached to the outer periphery of the lower end of the hollow tube 4.
次に、本発明法の一例として、砂杭の造成とマウンド
の築造ならびにその締固め均しの一連の作業を行なう工
程を第３図により説明する。Next, as an example of the method of the present invention, a process of performing a series of operations for forming a sand pile, constructing a mound, and compacting the mound will be described with reference to FIG.
まず、この砂杭造成船１を使用し、中空管４内に砂を
供給しながら頭部のバイブロハンマー２等を用いて通常
の方法により所定の海底軟弱地盤16中に砂杭（サンドコ
ンパクションパイル）17を造成する（第３図（イ））。First, a sand pile (sand compaction) is placed in a predetermined submarine soft ground 16 by using the vibro hammer 2 or the like at the head while supplying sand into the hollow pipe 4 using the sand pile formation ship 1. Pile) 17 is formed (FIG. 3 (a)).
次に、この砂杭17により地盤強化された場所に、この
砂杭造成船１を使用してマウンド18を築造する。この場
合中空管４をいったん引上げてその下端に前記したタン
パー５をボルト止め等により装着する。Next, a mound 18 is built using the sand pile forming ship 1 in a place where the ground is strengthened by the sand piles 17. In this case, the hollow tube 4 is once pulled up, and the above-mentioned tamper 5 is attached to the lower end thereof by bolting or the like.
砂，砂利，砕石等のマウンド築造用材料は先に砂杭17
造成の際に使用したサンドビン９にいったんストックさ
れ、ベルトコンベヤ10でグランドホッパー11に運ばれ、
ウインチ15により昇降するバケット12に所定量移し変え
られて中空管４上部のホッパー３に投入される。中空管
４内の該材料は中空管４下端から排出散布され、マウン
ド18の原形を造成する（第３図（ロ））。Materials for mound construction such as sand, gravel, crushed stone, etc.
Once stocked in the sand bin 9 used for construction, it is transported to the ground hopper 11 by the belt conveyor 10,
A predetermined amount is transferred to a bucket 12 which moves up and down by a winch 15, and is put into a hopper 3 above the hollow tube 4. The material in the hollow tube 4 is discharged and sprayed from the lower end of the hollow tube 4 to form the original shape of the mound 18 (FIG. 3 (b)).
このとき、上記バイブロハンマー２を使用してその振
動により上記タンパー５でマウンド18の造成とその締固
めを同時に行ってもよい。At this time, formation of the mound 18 and compaction of the mound 18 may be simultaneously performed by the tamper 5 by vibrating the vibratory hammer 2.
最後に、バブロハンマー２によりマウンド18の締固め
と均し作業行なう（第３図（ロ）〜（ハ））。このとき
に、はじめて上記タンパー５を中空管４下端に装着する
ようにしてもよい。Finally, the mound 18 is compacted and leveled by the Babham hammer 2 (FIGS. 3 (b)-(c)). At this time, the tamper 5 may be attached to the lower end of the hollow tube 4 for the first time.
この締固め施工時には、中空管４の巻上げと巻下げ操
作を繰返してタンパー５による突固め力を高めてマウン
ド18をより強固に締固めることもできる。また、マウン
ド18の均し作業の際には、マウンド18の高さを調整する
ために中空管４は所定レベルまで引上げ、マウンド18上
面の凹凸は中空管４からのマウンド築造用材料の補給と
バイブロハンマー２の振動により補整して行く。At the time of this compaction work, the operation of raising and lowering the hollow tube 4 can be repeated to increase the compaction force of the tamper 5 so that the mound 18 can be compacted more firmly. In addition, when leveling the mound 18, the hollow tube 4 is pulled up to a predetermined level in order to adjust the height of the mound 18. Compensation is performed by replenishment and vibration of the vibro hammer 2.
なお、この実施例では地盤改良として砂杭造成個所に
マウンドを築造する例を説明したが、砂杭を造成する必
要はないが、地盤やマウンドを更に強化するために砂，
砂利等を使用して締固め均し施工を行なう必要がある場
所でも、この砂杭造成船を使用する本発明法を適用する
ことができるのは勿論である。In this embodiment, an example in which a mound is constructed at a sand pile formation site as ground improvement has been described. However, it is not necessary to form a sand pile.
It is needless to say that the method of the present invention using the sand pile building ship can be applied to places where it is necessary to perform compaction and leveling work using gravel or the like.
また、築かれたマウンド法面を締固めるために、上記
タンパー５を中空管４下端に該法面の角度に合せ傾斜さ
せて取付けたり、法面の角度の合うタンパーを使用する
こともできる。Further, in order to compact the constructed mound slope, the tamper 5 may be attached to the lower end of the hollow tube 4 at an angle according to the angle of the slope, or a tamper having an angle of the slope may be used. .
（ホ）発明の効果 本発明は上述のようにしてなり、砂杭造成船に装備し
た砂杭造成用中空管下端にタンパーを取付るだけで、該
船の材料供給装置やバイブロハンマー等をそのまま利用
することができ、また該船の施工管理装置である中空管
の上下移動を計測する深度計や中空管内部の材料高さを
測定する砂面計ならびに船***置測定システム等を利用
して高精度な改良地盤の品質管理を行なうことができ
る。(E) Effects of the Invention The present invention is as described above, and by simply attaching a tamper to the lower end of a hollow pipe for sand pile construction mounted on a sand pile construction ship, the material supply device, vibratory hammer and the like of the ship are constructed. It can be used as it is, and uses a depth gauge that measures the vertical movement of the hollow tube, a sand level meter that measures the material height inside the hollow tube, a hull position measurement system, etc. As a result, highly accurate quality control of the improved ground can be performed.
しかも、本発明法は同一の砂杭造成船で砂杭造成は勿
論のこと、マウンドの造成やその締固め均し作業まで能
率よく行うことができるので、作業船の回航費や艤装費
が不用となって極めて経済的である等多くの利点を有す
る。In addition, the method of the present invention can efficiently perform not only sand pile formation but also mound formation and compaction of the same mound with the same sand pile formation ship, so that there is no need for the voyage cost and outfitting cost of the work boat. It has many advantages such as being extremely economical.
第１図は、本発明法を実施する装置全体の一例を示す説
明図、第２図は本発明法における締固め均し時の要領を
示す説明図、第３図（イ）〜（ハ）は本発明法により砂
杭とマウンドを造成する場合の工程説明図である。 符号説明 １……砂杭造成船、２……バイブロハンマー、３……ホ
ッパー、４……砂杭造成用中空管、５……タンパー、６
……リーダー、７……ウインチ、８……ワイヤーロー
プ、９……サンドビン、10……ベルトコンベヤ、11……
グランドホッパー、12……バケット、13……滑車、14…
…ワイヤーロープ、15……ウインチ、16……海底地盤、
17……砂杭、18……マウンドFIG. 1 is an explanatory view showing an example of the entire apparatus for carrying out the method of the present invention, FIG. 2 is an explanatory view showing the procedure of compaction in the method of the present invention, and FIGS. 3 (a) to 3 (c). FIG. 4 is an explanatory view of a process in the case of forming a sand pile and a mound by the method of the present invention. Description of symbols 1 ... sand pile building ship, 2 ... vibro hammer, 3 ... hopper, 4 ... hollow tube for sand pile formation, 5 ... tamper, 6
... Leader, 7 ... Winch, 8 ... Wire rope, 9 ... Sand bin, 10 ... Belt conveyor, 11 ...
Grand hopper, 12 …… bucket, 13 …… pulley, 14…
... wire rope, 15 ... winch, 16 ... submarine ground,
17 …… sand pile, 18 …… mound
Claims (2)
タンパーを着脱自在に取付け、該中空管上部のホッパー
から砂，砂利，砕石等の締固め均し材料を中空管内に供
給して中空管下端から海底地盤へ排出散布し、中空管頭
部に装備するバイブロハンマーの振動によって上記材料
を締固め均すことを特徴とする砂杭造成船による地盤改
良工法。1. A tamper is removably attached to the outer periphery of the lower end of a hollow pipe for sand pile construction of a sand pile construction ship, and a hopper on the upper part of the hollow pipe is used to pack compacted material such as sand, gravel, crushed stone and the like into the hollow pipe. A ground improvement method using a sand pile building ship, characterized in that the material is supplied to the bottom of the hollow pipe, discharged and dispersed from the lower end of the hollow pipe to the seabed, and the above material is compacted and leveled by the vibration of a vibratory hammer provided at the head of the hollow pipe.
成した後、該砂杭造成個所にマウンドを造成するに際し
て、砂杭造成用中空管の下端外周にタンパーを着脱自在
に取付け、該中空管上部のホッパーからマウンド造成な
らびに締固め均し材料を中空管内に供給して中空管下端
から排出することによりマウンドを築造すると共に該マ
ウンドを中空管頭部に装備するバイブロハンマーによっ
て締固め均することを特徴とする砂杭造成船による地盤
改良工法。2. After a sand pile is formed on a soft undersea ground by a sand pile forming ship, a tamper is removably attached to an outer periphery of a lower end of a hollow pipe for forming a sand pile when a mound is formed at the sand pile forming place. A mound is formed from a hopper above the hollow tube and a material for compaction is supplied into the hollow tube and discharged from the lower end of the hollow tube to form a mound, and the mound is mounted on the head of the hollow tube. Ground improvement method by sand pile building ship characterized by compaction by hammer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17318989A JP2663021B2 (en) | 1989-07-05 | 1989-07-05 | Ground improvement method by sand pile formation ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17318989A JP2663021B2 (en) | 1989-07-05 | 1989-07-05 | Ground improvement method by sand pile formation ship |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0339515A JPH0339515A (en) | 1991-02-20 |
| JP2663021B2 true JP2663021B2 (en) | 1997-10-15 |
Family
ID=15955746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17318989A Expired - Fee Related JP2663021B2 (en) | 1989-07-05 | 1989-07-05 | Ground improvement method by sand pile formation ship |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2663021B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127287A (en) * | 2009-12-15 | 2011-06-30 | Aomi Construction Co Ltd | Construction method and apparatus for compacting subaqueous mound |
| KR102136610B1 (en) * | 2019-05-28 | 2020-07-22 | (주)더파빌리온 | Process for Deep Cement Mixing for Recycling Floating Soil at Sea Bed |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2781937B2 (en) * | 1992-01-10 | 1998-07-30 | 株式会社 森長組 | Stone distribution equipment for arranging discarded stones on the seabed |
| JPH0742703B2 (en) * | 1992-01-11 | 1995-05-10 | 株式会社森長組 | Abandoned stone leveling device |
| JP4969694B1 (en) * | 2011-07-27 | 2012-07-04 | 潔 斎藤 | Underwater rubble foundation leveling device |
| JP5850427B2 (en) * | 2012-02-23 | 2016-02-03 | 日本海工株式会社 | Underwater obstacle crushing apparatus and underwater obstacle crushing method |
| CN106245650B (en) * | 2016-07-27 | 2018-05-01 | 中国石油大学(华东) | Aerial Submarine Pipeline double freedom Throwing sand controlling devices |
| CN106245649A (en) * | 2016-07-27 | 2016-12-21 | 中国石油大学(华东) | Bucket type Aerial Submarine Pipeline ramming controlling device and construction method |
| CN108824414B (en) * | 2018-07-18 | 2023-12-26 | 中交四航工程研究院有限公司 | Underwater dynamic compaction device and construction method thereof |
-
1989
- 1989-07-05 JP JP17318989A patent/JP2663021B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127287A (en) * | 2009-12-15 | 2011-06-30 | Aomi Construction Co Ltd | Construction method and apparatus for compacting subaqueous mound |
| KR102136610B1 (en) * | 2019-05-28 | 2020-07-22 | (주)더파빌리온 | Process for Deep Cement Mixing for Recycling Floating Soil at Sea Bed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339515A (en) | 1991-02-20 |
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