JP2953823B2 - Construction method of offshore substructure - Google Patents
Construction method of offshore substructureInfo
- Publication number
- JP2953823B2 JP2953823B2 JP18543591A JP18543591A JP2953823B2 JP 2953823 B2 JP2953823 B2 JP 2953823B2 JP 18543591 A JP18543591 A JP 18543591A JP 18543591 A JP18543591 A JP 18543591A JP 2953823 B2 JP2953823 B2 JP 2953823B2
- Authority
- JP
- Japan
- Prior art keywords
- offshore
- frame
- pier
- substructure
- sea
- 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
- Foundations (AREA)
- Bridges Or Land Bridges (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、海洋に設置される構造
物、例えば、橋梁やシーバース等の基礎構造物の建造方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a structure installed in the ocean, for example, a foundation structure such as a bridge or a sea berth.
【０００２】[0002]
【従来の技術】近年、我国では比較的水深の深い海域に
橋梁やシーバースを建設する事例が増えつつある。例え
ば、１９８８年に開通した本州四国連絡橋備讃瀬戸大橋
は、造船所等において基礎部分となる大型の鋼製ケーソ
ンを製作し、これを浮かべて設置場所まで海上曳航し、
水深５０ｍの支持地盤上に沈設した後、現場で不足分の
上部を継ぎ足していくという建造方法が採用された。2. Description of the Related Art In recent years, in Japan, bridges and sea berths have been increasingly constructed in relatively deep waters. For example, Bisan Seto Bridge, Honshu-Shikoku Bridge, which was opened in 1988, produced a large steel caisson that was used as a foundation at shipyards, etc.
After submerging on a supporting ground at a depth of 50 m, a construction method was adopted in which the insufficient upper part was added at the site.
【０００３】また、シーバースの基礎構造物として、鋼
製のジャケット式構造物が採用されている。この構造物
は工場製作した立体トラスであるジャケット本体を運搬
し、海底に据え付け、ジャケットの支柱内を貫通して地
盤に杭を打設し、杭頭部に上部工を架設固定して施工さ
れる。[0003] Further, a steel jacket-type structure is employed as a substructure of the sea berth. This structure is constructed by transporting the jacket body, a three-dimensional truss manufactured at the factory, installing it on the sea floor, penetrating through the columns of the jacket, driving the pile into the ground, and installing and fixing the superstructure at the pile head. You.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記橋
梁の基礎部分となる大型ケーソンの設置作業では、基礎
の底面が大きいので海底面の掘削・均し作業を広い面積
に対して行う必要があり、また、シーバースにおけるジ
ャケットの設置作業では、杭の打設作業を伴うなど、作
業船および機材に対する費用が高価とならざるを得な
い。更に、上記海洋構造物の現場施工期間が一般に長い
ことから、構造物が不安定な状態で長期間にわたり外力
にさらされるため、防護工として周辺の仮設備が大きく
なるという欠点を有している。However, in the work of installing a large caisson, which is the foundation of the bridge, it is necessary to perform excavation and leveling of the sea bottom over a large area because the bottom of the foundation is large. In addition, the installation work of the jacket in the sea berth involves the installation work of the pile, and the cost for the work boat and the equipment must be expensive. Furthermore, since the on-site construction period of the above-mentioned offshore structure is generally long, the structure is exposed to external force for a long period of time in an unstable state. .
【０００５】本発明は前記課題を解決しようとするもの
であり、その目的は、海洋基礎構造物を構成する支持部
材を簡易な構造とし、これを組み立てて、海洋基礎構造
物を建造する方法を提供することにある。An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method for constructing a marine substructure by assembling the support member constituting the marine substructure with a simple structure. To provide.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る海洋基礎構造物の建造方法は、海洋構
造物の基礎を構成する複数の支持部材を組立場所以外で
製作し、これを最終設置場所へ洋上曳航し、該支持部材
の下端部を海底地盤に着底させた後、二以上の支持部材
の頂部を連結し、かつ、各支持部材の下端部を海底地盤
に固定することによって課題を解決したものである。In order to achieve the above object, a method of constructing an offshore substructure according to the present invention comprises manufacturing a plurality of support members constituting a foundation of an offshore structure at a place other than an assembly place. This is towed offshore to the final installation location, the lower end of the support member is landed on the seabed ground, the tops of two or more support members are connected, and the lower end of each support member is fixed to the seabed ground. This solves the problem.
【０００７】[0007]
【実施例】以下、海洋基礎構造物として橋梁の橋脚を例
に取り、その建造方法の好適な実施例を、図１に基づい
て説明する。橋脚部材の製作 予め、ドライドックで橋脚を構成するフレーム３を製作
する。フレーム３は、図２（Ａ）に示すような、２本の
脚柱３ａ間に桁３ｂを渡した梯子形状をした一対のトラ
ス状フレーム３、３′によって構成する。各フレーム
３、３′の大きさは、設置される海域の水深によって定
まるが、橋脚の高さが数十ｍ〜数百ｍの範囲内で可能で
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for constructing a pier of a bridge will be described below with reference to FIG. Manufacture of Bridge Pier A frame 3 constituting a bridge pier is manufactured in advance by a dry dock. The frame 3 is constituted by a pair of ladder-shaped frames 3, 3 'having a ladder shape in which a spar 3b is provided between two pillars 3a as shown in FIG. The size of each frame 3, 3 'is determined by the water depth of the sea area in which it is installed, but the height of the pier can be within a range of several tens to several hundreds of meters.
【０００８】例えば、１００ｍの水深に設置される橋脚
であれば、外径１０ｍのコンクリート管で、高さ１２０
ｍ、頂部幅５０ｍ、脚柱間の開脚幅１００ｍといった寸
法に製作される。また、脚柱３ａの内部には、数ｍ間隔
で鋼板製の隔壁を設けて内部を区画し、後記するバラス
ト材が注入される空室と、同バラスト材の給排水を行う
ポンプを設置するポンプ室として利用できるように構成
する。For example, a pier installed at a depth of 100 m is a concrete pipe having an outer diameter of 10 m and a height of 120 m.
m, the top width is 50 m, and the leg width between the pillars is 100 m. Further, inside the pillar 3a, a partition made of a steel plate is provided at intervals of several meters to partition the inside, and a pump for installing a vacant room into which a ballast material described later is injected and a pump for supplying and discharging the ballast material are provided. It is configured so that it can be used as a room.
【０００９】海底地盤の掘削 始めに、フレーム３、３′を着底する部分の海底地盤を
予め掘削し、レベル調整を行う（工程）。また、この
際に、海底地盤の地耐力を調査した上で、必要があれ
ば、掘削孔１内にプレキャスト製コンクリート版等を設
置するか、或いは、水中コンクリートを打設して、海底
基礎２を造成する（工程）。At the beginning of excavation of the submarine ground, the submarine ground at the portion where the frames 3, 3 'are landed is excavated in advance, and the level is adjusted (process). At this time, after investigating the ground strength of the seabed ground, if necessary, a precast concrete plate or the like is installed in the excavation hole 1 or an underwater concrete is poured into the seabed foundation 2. (Process).
【００１０】曳航 フレーム３をドライドックから曳き出して洋上に浮か
べ、設置する海域まで浮上曳航する。なお、小規模なド
ライドックで製作する場合には、フレーム３を複数部分
に分割して製作し、これをドライドックから曳き出して
静穏な洋上で接合した後、最終設置場所へ曳航してもよ
い。[0010] The tow frame 3 is pulled out of the dry dock, floated on the sea, and levitated and towed to the sea area where it is to be installed. In the case of manufacturing with a small dry dock, the frame 3 is divided into a plurality of parts, manufactured, pulled out of the dry dock, joined on a calm sea, and then towed to the final installation location. Good.
【００１１】フレームの着底 先ず、洋上に横たわっているフレーム３の基底部から海
水等のバラスト材を注入していき、フレーム３を洋上で
鉛直に起立させる（工程）。その後、更にバラスト材
を注水して、そのまま前記造成した基礎２上に着底させ
る（工程）。同じ操作をもう一つのフレーム３′につ
いても行う。[0011] bottom landing of the frame first, we will inject the ballast material such as seawater from the base of the frame 3 lying offshore, is vertically upright frame 3 at sea (step). Thereafter, the ballast material is further injected with water, and the ballast material is directly settled on the formed foundation 2 (step). The same operation is performed for another frame 3 '.
【００１２】橋脚の組立 各フレーム３、３′にバラスト材を加え、両者の頂部を
徐々に引き寄せる。引き寄せ作業は、クレーン船、曳
船、ウィンチ等の設備により行う。この際に、注水量と
注水速度を調整することにより、フレーム３、３′の傾
きと橋脚の姿勢を制御することができる。その後、両フ
レーム３、３′の頂部を適当な金具で結合する（工程
）。 Assembling the pier A ballast material is added to each frame 3, 3 ', and the tops of both are gradually drawn. The pulling work is performed by equipment such as a crane ship, tugboat, and winch. At this time, the inclination of the frames 3, 3 'and the attitude of the pier can be controlled by adjusting the water injection amount and the water injection speed. After that, the tops of both frames 3, 3 'are joined with appropriate metal fittings (step).
【００１３】橋脚の固定 フレーム３、３′の脚柱３ａが着底している掘削孔１内
を、土砂、ソイルセメントまたはコンクリート４等で埋
め戻して、脚柱３ａの下端部を海底地盤に固定する（工
程）。The inside of the excavation hole 1 on which the pillars 3a of the fixed frames 3, 3 'of the piers have landed is backfilled with earth and sand, soil cement, concrete 4, or the like, and the lower end of the pillars 3a is placed on the seabed ground. Fix (process).
【００１４】最後に、両フレーム３、３′の洋上に突出
している頂部に所定の大きさの頂版５を載置し、橋脚の
高さ、姿勢を最終的に調整する（工程）。Finally, a top plate 5 having a predetermined size is placed on the tops of the frames 3, 3 'projecting offshore, and the height and posture of the pier are finally adjusted (step).
【００１５】上部工 通常の橋梁施工法と同様にして、主塔等の上部構造物６
を前記頂版５上に設置する（工程）。[0015] in the same manner as in the superstructure normal bridge construction methods, upper structure of the main tower, etc. 6
Is placed on the top plate 5 (step).
【００１６】以上の実施例では、一対のフレーム３、
３′をもって橋脚を構成したが、本発明は、これ以外に
も、図２（Ｂ）に示すような中空のコンクリート製また
は鋼製の支柱７を用いて橋脚を構成する支持部材とする
こともできる。即ち、当該支柱７と前記フレーム３との
組合せ、または、複数本の支柱７、７′による組合せが
可能である。更に、フレーム３または支柱７を組み合せ
て、図２（Ｃ）に示すような櫓形の基礎構造物８とする
ことも可能である。In the above embodiment, a pair of frames 3,
Although the bridge pier is constituted by 3 ', the present invention may also be applied to a support member constituting a bridge pier by using a hollow concrete or steel pillar 7 as shown in FIG. 2 (B). it can. That is, a combination of the column 7 and the frame 3 or a combination of a plurality of columns 7, 7 'is possible. Furthermore, it is also possible to combine the frame 3 or the support column 7 to form a tower-shaped substructure 8 as shown in FIG.
【００１７】[0017]
【発明の効果】本発明の海洋基礎構造物の建造方法は、
支持部材を簡易な構造の支柱をもって構成したので、構
造物を極めて簡易な方法により建造することができる。
また、支持部材の製作が全てドライドック内で行えるか
ら、洋上作業の多い従来法と比べて、工期を短縮するこ
とができ、品質管理も行き届くという優れた効果を有す
る。The method for constructing an offshore substructure according to the present invention comprises:
Since the supporting member is constituted by the columns having a simple structure, the structure can be built by an extremely simple method.
In addition, since all of the support members can be manufactured in the dry dock, the construction period can be shortened and quality control can be performed well as compared with the conventional method that involves many offshore operations.
【図１】橋脚の組立施工順序を示す説明図である。FIG. 1 is an explanatory diagram showing an assembling / construction order of a pier.
【図２】橋脚を構成する支持部材の変形例を示した図で
ある。FIG. 2 is a view showing a modified example of a support member constituting a pier.
１ 掘削孔 ２ 海底基礎 ３、３′ フレーム ４ 埋戻し ５ 頂版 ６ 上部構造物 DESCRIPTION OF SYMBOLS 1 Drilling hole 2 Submarine foundation 3, 3 'frame 4 Backfill 5 Top plate 6 Superstructure
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) E02B 17/02 E01D 19/02 E01D 21/00 E02D 27/32 E02B 17/00 Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) E02B 17/02 E01D 19/02 E01D 21/00 E02D 27/32 E02B 17/00
Claims (1)
部材を組立場所以外で製作し、これを最終設置場所へ洋
上曳航し、該支持部材の下端部を海底地盤に着底させた
後、二以上の支持部材の頂部を連結し、かつ、各支持部
材の下端部を海底地盤に固定することを特徴とする海洋
基礎構造物の建造方法。1. A plurality of support members constituting a foundation of an offshore structure are manufactured at a place other than an assembly place, and these are towed offshore to a final installation place, and a lower end portion of the support member is landed on the seabed ground. A method of constructing a marine substructure, comprising connecting the tops of two or more support members and fixing the lower end of each support member to the seabed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18543591A JP2953823B2 (en) | 1991-06-29 | 1991-06-29 | Construction method of offshore substructure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18543591A JP2953823B2 (en) | 1991-06-29 | 1991-06-29 | Construction method of offshore substructure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH059922A JPH059922A (en) | 1993-01-19 |
| JP2953823B2 true JP2953823B2 (en) | 1999-09-27 |
Family
ID=16170745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18543591A Expired - Fee Related JP2953823B2 (en) | 1991-06-29 | 1991-06-29 | Construction method of offshore substructure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2953823B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4539989B2 (en) * | 2006-01-31 | 2010-09-08 | 日鉄トピーブリッジ株式会社 | Artificial seabed with upwelling flow and its construction method |
| JP6573277B2 (en) * | 2015-11-02 | 2019-09-11 | 三井住友建設株式会社 | How to build a main tower or pier |
-
1991
- 1991-06-29 JP JP18543591A patent/JP2953823B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH059922A (en) | 1993-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990622 |
|
| LAPS | Cancellation because of no payment of annual fees |