JP4445083B2

JP4445083B2 - Construction method of foundation for laying objects

Info

Publication number: JP4445083B2
Application number: JP37060599A
Authority: JP
Inventors: 正義松木田; 英明米山
Original assignee: Taisei Corp
Current assignee: Taisei Corp
Priority date: 1999-12-27
Filing date: 1999-12-27
Publication date: 2010-04-07
Anticipated expiration: 2019-12-27
Also published as: JP2001182081A

Description

【０００１】
【発明の属する技術分野】
本発明は、海洋構造物等の敷設物用基礎の構築方法に関するものである。
【０００２】
【従来の技術】
従来の海洋構造物等の敷設物用基礎の構築方法においては、支持体と敷設物との間に袋体を配置する場合、袋体を支持体に密着させることなく支持体に取り付けていた。
【０００３】
【本発明が解決しようとする課題】
前記した従来の敷設物用基礎の構築方法においては、次のような問題点があった。
＜イ＞支持基礎を水中に構築する場合、支持体と敷設物の間に配置する袋体の一部が水中に浮遊し、水流や波浪等の外力の影響を受け袋体が損傷を受けたり、支持体から剥離することがある。
＜ロ＞筒状の支持体の中にパイプを通す場合、袋体の一部が筒状の支持体内に垂れ下がり、パイプを通す作業を阻害したり、或いは袋体が損傷を受けたり、支持体から剥離することがある。
【０００４】
【本発明の目的】
本発明は上記したような従来の問題を解決するためになされたもので、袋体が固結材注入前に損傷を受けたり、支持体から剥離し離脱したり、あるいは支持体内に敷設物を挿入する際にその作業を阻害することなく、円滑に固結材を袋体に注入することができる敷設物用基礎の構築方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記のような目的を達成するために、本発明の構築方法は、海底に敷設する敷設物と、敷設物を海底で支持する支持体の間隙に固結材を注入して支持基礎を構築する方法において、敷設物と支持体の間に袋体を配置するとともに、該袋体の全面を被覆材で覆って、その外周縁部を支持体に接着し、この被覆材の内部の空気を吸引して被覆材の内部を負圧状態とし、被覆材で被覆した前記袋体を支持体に密着させた後、前記袋体内に固結材を注入して膨脹させることを特徴とする敷設物用基礎の構築方法、あるいは、海底に敷設する敷設物と、敷設物を海底で支持する支持体の間隙に固結材を注入して支持基礎を構築する方法において、敷設物と支持体の間に袋体を配置し、接着剤などで袋体を支持体に固定した後、この袋体の内部の空気を吸引して袋体の内部を負圧状態とし、前記袋体を支持体に密着させた後、前記袋体内に固結材を注入して膨脹させることを特徴とする敷設物用基礎の構築方法である。
【０００６】
【発明の実施の形態１】
以下図面を参照しながら本発明の実施の形態について説明する。
【０００７】
＜イ＞敷設物。
本発明の対象となる敷設物は、例えば海洋構造物やパイプなど海底に敷設する物体である。
【０００８】
＜ロ＞支持体。
敷設物を直接海底に設置した場合、不等沈下等を生ずる。そのために海底には支持体を設置し、その上に敷設物を載置する。支持体は例えばコンクリート製の板体である。
【０００９】
＜ハ＞袋体。
袋体４は、その内部にモルタル等の固結材を注入できる伸縮性を有する袋状のものである。また袋体４は、通気性のある材料やゴム、ビニ−ル等の不透水膜で形成するが、被覆材３で覆わない場合は、通気性の材料は使用せず不透水膜だけを用いる。
袋の内部に固結材を注入するための注入口８を備えている。
【００１０】
＜ニ＞被覆材。
被覆材３は、ビニール等のように気密性及び伸縮性を有するシ−ト状の部材である。これに膨脹力が作用した場合、これに対応して容易に膨脹し、あるいは一定限度まで膨脹した場合は破れるようなものであってもよい。図１のように、袋体４を完全に覆うようにするため、その外周縁部に接着材７や他の接着手段のための取付代を設ける。また内部の空気を吸引するための吸引口９を設けてある。
【００１１】
＜ホ＞袋体の配置と被覆、及び被覆材内部の空気の吸引。
袋体４を、敷設物１に対向する支持体２の全面に配置するか、又は所要の間隔をもたせて配置する。次に、袋体４を被覆材３で全面を包み込むように覆う。さらに、被覆材３の外周縁部に接着材７を塗布し、支持体２に接着する。被覆材３と支持体２との接着手段は、接着材に限定されることはなく、板状体等を被覆材３の外周縁部に配置しボルト等で固定し支持体２に接着させたり、粘着テ−プ状の部材等を用いて接着させてもよい。
次に、吸引機をもって被覆材３の内部の空気を吸引する。被覆材内部を負圧状態とすることで被覆材３を袋体４とともに支持体２に密着することができる。
なお被覆材３内部の空気は、支持体２を海底地盤上の設置する前に吸引しないで、海底地盤上に設置した後に吸引して密着させる場合もある。
【００１２】
＜ヘ＞固結材の袋体への注入。
支持体２を海底地盤上に設置する。支持体の周囲には仮受杭６を打設する。その上部に敷設物１を仮受けする。
この状態において、海上の固結材運搬船より袋体４に連接している固結材注入ホース５を通して袋体４に固結材を注入する。
すると袋体４は膨脹し、図２の１点鎖線で示すように敷設物１の底面に接触し、敷設物１と支持体２との間隙を埋める。この場合、袋体４を被覆しているビニール等の被覆材３は袋体４の膨脹に伴って破れることもある。
固結材の固化に伴って敷設物、支持体及び袋体が一体となり敷設物基礎とて機能する。
【００１３】
＜ト＞袋体を被覆材で覆わない場合。
袋体を被覆材で覆うことなく施工する場合もある。この場合は気密性及び伸縮性を有するゴム、ビニ−ル製等の不透水膜で袋体を構成する。袋体を支持体に接着剤やボルト等により支持体に固定した後、上記と同様の方法で袋体内部の空気を吸引して支持体に密着させた後、固結材を袋体内に注入して袋体が敷設物に接触するまで膨脹させれば、敷設物と支持体と一体となり支持基礎を形成することができる。
この場合、袋体内への固結材注入と同時に空気を注入することがないように、固結材の種類や注入方法を適切に選択する。
【００１４】
＜チ＞上記の方法は、沈埋函を水中の基礎杭上に設置する際、基礎杭上部の沈埋函との対向面に被覆材３で覆われた袋体４を設置して敷設物用基礎を構築する方法にも適用することができる。
【００１５】
【発明の実施の形態２】
＜イ＞敷設物用基礎としてパイプ用基礎を例にとり、その構築方法を図３及び４に基づき説明する。
【００１６】
＜ロ＞図３及び４に示すように、敷設物１であるパイプを連接して敷設する際は、所望の箇所を載置台に固定してパイプを支える。
まずパイプ載置台１０を準備し、その載置台上に筒状の支持体２を載置する。
次に支持体２の内側面に気密性及び伸縮性を有する袋体又は被覆材３で覆った袋体４を配置した後、発明の実施の形態１と同様に気密性を有する被覆材内部の空気を吸引し、袋体４を筒状の支持体２に密着させる。さらに、自由空間が生じた筒状の支持体２内部にパイプ敷設物１を挿入し、支持体２と敷設物１の同心軸が一致するように位置決めし、敷設物１を支持体２の中心に据え付ける。
最後に、袋体４に固結材を注入し、袋体を膨脹させ敷設物１と支持体２との間隙を埋め敷設物を固定するが、その方法は発明の実施の形態１において説明した方法と同一である。
また袋体を被覆材で覆わない場合があることは、前記と同様である。
【００１７】
【本発明の効果】
本発明の敷設物用基礎の構築方法は以上説明したようになるから次のような効果を得ることができる。
＜イ＞袋体を支持体に密着させるように構成したので、敷設物用基礎を水中に構築する場合、固結材を注入する袋体の一部が水中に浮遊し、水流や波浪等の外力の影響により損傷を受けたり、支持体から剥離することがない。
＜ロ＞筒状の支持体の中にパイプを通す場合、袋体の一部が筒状の支持体内に垂れ下がり、パイプを通す作業を阻害したり、或いは袋体が損傷を受けたり、支持体から剥離することがない。
従って、支持体への敷設物の配置及び袋体内への固結材注入を整斉円滑に行うことができる。
【図面の簡単な説明】
【図１】本発明で使用する袋体と被覆材の説明図。
【図２】本発明の敷設物を海洋構造物とした場合の実施例の説明図。
【図３】本発明の敷設物をパイプとした場合の実施例の側面図。
【図４】本発明の敷設物をパイプとした場合の実施例の断面図。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a foundation for a construction object such as an offshore structure.
[0002]
[Prior art]
In a conventional method for constructing a foundation for a laying object such as an offshore structure, when the bag is disposed between the support and the laying object, the bag is attached to the support without being in close contact with the support.
[0003]
[Problems to be solved by the present invention]
The above-described conventional method for constructing a foundation for a laid object has the following problems.
 When the support foundation is constructed underwater, part of the bag placed between the support and the laying object floats in the water, and the bag is damaged by the influence of external forces such as water flow and waves. , May peel from the support.
 When a pipe is passed through a cylindrical support body, a part of the bag body hangs down in the cylindrical support body, obstructing the operation of passing the pipe, or the bag body is damaged, or the support body May peel off.
[0004]
[Object of the present invention]
The present invention has been made in order to solve the above-described conventional problems, and the bag body is damaged before the consolidation material is injected, peeled off from the support body, detached from the support body, or a laying object is placed in the support body. It aims at providing the construction method of the foundation for laying objects which can inject | pour a consolidated material into a bag body smoothly, without inhibiting the operation | work when inserting.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the construction method of the present invention constructs a support foundation by injecting a caking material into a gap between a laying object laid on the seabed and a support that supports the laying object on the seabed. in the method, along with placing the bag body between the laying thereof and the support, I covering the entire surface of the bag body with a coating material, adhered to the outer peripheral portion to the support, the internal air of the coating material The laying structure is characterized in that the inside of the covering material is brought into a negative pressure state by suction, the bag body covered with the covering material is brought into close contact with a support, and then the caking material is injected into the bag body to be expanded. In a method for constructing a foundation for construction, or a method for constructing a support foundation by injecting a caking material into a gap between a laying object to be laid on the seabed and a support that supports the laying object on the seabed, between the laying object and the support. to place a bag, after fixing the bag to the support with an adhesive, suction the air inside the bag In the inside of the bag and a negative pressure state, after close contact with the bag body to a support, construction method of laying thereof for foundation, characterized in that inflating by injecting consolidating material to said bag body is there.
[0006]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
 Laying objects.
The laying object which is the object of the present invention is an object laid on the seabed such as an offshore structure or a pipe.
[0008]
 Support.
If the laying object is installed directly on the seabed, unequal settlement will occur. For this purpose, a support is installed on the seabed, and a laying object is placed thereon. The support is, for example, a concrete plate.
[0009]
<C> Bag body.
The bag body 4 is a bag-like thing having the elasticity which can inject | pour solidification materials, such as mortar, into the inside. The bag 4 is formed of a breathable material or a water-impermeable film such as rubber or vinyl. However, when not covered with the covering material 3, a breathable material is not used and only the water-impermeable film is used. .
An injection port 8 for injecting the caking material into the bag is provided.
[0010]
<D> Covering material.
The covering material 3 is a sheet-like member having airtightness and stretchability such as vinyl. When an expansion force acts on this, it may be easily expanded correspondingly, or may be broken when expanded to a certain limit. As shown in FIG. 1, in order to completely cover the bag body 4, an attachment margin for the adhesive 7 and other bonding means is provided on the outer peripheral edge portion thereof. A suction port 9 is provided for sucking the internal air.
[0011]
<E> Arrangement and covering of bag and suction of air inside covering material.
The bag body 4 is arrange | positioned on the whole surface of the support body 2 facing the installation thing 1, or arrange | positions with a required space | interval. Next, the bag body 4 is covered with the covering material 3 so as to wrap the entire surface. Further, the adhesive 7 is applied to the outer peripheral edge of the covering material 3 and adhered to the support 2. The bonding means between the covering material 3 and the support body 2 is not limited to the bonding material, and a plate-like body or the like is arranged on the outer peripheral edge of the covering material 3 and fixed with a bolt or the like, and adhered to the support body 2. Alternatively, it may be adhered using an adhesive tape-like member or the like.
Next, the air inside the covering material 3 is sucked with a suction machine. By making the inside of the covering material into a negative pressure state, the covering material 3 can be brought into close contact with the support body 2 together with the bag body 4.
In some cases, the air inside the covering material 3 is not sucked before the support 2 is placed on the seabed ground, but is sucked and brought into close contact after being placed on the seabed ground.
[0012]
<F> Injection of consolidated material into the bag.
The support body 2 is installed on the seabed ground. A temporary pile 6 is placed around the support. The laying object 1 is temporarily received on the upper part.
In this state, the caking material is injected into the bag body 4 through the caking material injection hose 5 connected to the bag body 4 from the marine caking material carrier.
Then, the bag body 4 expands and contacts the bottom surface of the laying object 1 as shown by a one-dot chain line in FIG. 2 to fill the gap between the laying object 1 and the support 2. In this case, the covering material 3 such as vinyl covering the bag body 4 may be broken as the bag body 4 expands.
Along with the solidification of the consolidated material, the laying object, the support body and the bag body are integrated to function as a laying object foundation.
[0013]
<G> When the bag is not covered with a covering material.
In some cases, the bag body is constructed without being covered with a covering material. In this case, the bag body is formed of a water-impermeable film made of rubber or vinyl having airtightness and stretchability. After fixing the bag body to the support body with adhesive, bolts, etc., after sucking the air inside the bag body and sticking it to the support body in the same way as above, injecting the consolidated material into the bag body If the bag body is inflated until it comes into contact with the laying object, the laying object and the support body can be integrated to form a support base.
In this case, the type of the filler and the injection method are appropriately selected so that air is not injected simultaneously with the injection of the binder into the bag.
[0014]
<H> When the submerged box is installed on an underwater foundation pile, the bag 4 covered with the covering material 3 is installed on the surface opposite to the submerged box at the top of the basic pile. It can also be applied to the method of building.
[0015]
Second Embodiment of the Invention
 A pipe foundation is taken as an example of the foundation for laying objects, and the construction method will be described with reference to FIGS.
[0016]
 As shown in FIGS. 3 and 4, when connecting and laying a pipe as the laying object 1, a desired portion is fixed to a mounting table to support the pipe.
First, the pipe mounting table 10 is prepared, and the cylindrical support 2 is mounted on the mounting table.
Next, after the bag body 4 covered with the airtight and stretchable bag body or the covering material 3 is arranged on the inner surface of the support body 2, the inside of the airtight covering material inside the covering material as in the first embodiment of the invention. Air is sucked and the bag 4 is brought into close contact with the cylindrical support 2. Further, the pipe laying object 1 is inserted into the cylindrical support body 2 in which free space is generated, and positioned so that the concentric axes of the support body 2 and the laying object 1 coincide with each other. To install.
Finally, a caking material is injected into the bag body 4 to inflate the bag body to fill the gap between the laying object 1 and the support body 2 and fix the laying object. The method has been described in the first embodiment of the invention. The method is the same.
Further, the bag body may not be covered with the covering material as described above.
[0017]
[Effect of the present invention]
Since the construction method of the foundation for laying objects according to the present invention is as described above, the following effects can be obtained.
<A> Since the bag body is configured to be in close contact with the support body, when constructing the foundation for laying objects in water, a part of the bag body into which the caking material is injected floats in the water, such as water currents and waves. It is not damaged or peeled off from the support by the influence of external force.
 When a pipe is passed through a cylindrical support body, a part of the bag body hangs down in the cylindrical support body, obstructing the operation of passing the pipe, or the bag body is damaged, or the support body Will not peel off.
Therefore, the arrangement of the laying material on the support and the injection of the caking material into the bag can be performed in a smooth and smooth manner.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a bag body and a covering material used in the present invention.
FIG. 2 is an explanatory diagram of an embodiment when the laying structure of the present invention is an offshore structure.
FIG. 3 is a side view of an embodiment in which the installation object of the present invention is a pipe.
FIG. 4 is a cross-sectional view of an embodiment in which the laying object of the present invention is a pipe.

Claims

In a method of constructing a support foundation by injecting a caking material into a gap between a laying object laid on the seabed and a support that supports the laying object on the seabed
While placing the bag between the laying object and the support,
It covered the entire surface of the bag body with a coating material, adhered to the outer peripheral portion to the support,
The air inside the covering material is sucked to make the inside of the covering material a negative pressure state ,
After adhering the bag body coated with a covering material to a support,
Injecting a caking material into the bag and inflating it,
Construction method for foundations for laying objects.

In a method of constructing a support foundation by injecting a caking material into a gap between a laying object laid on the seabed and a support that supports the laying object on the seabed
Place the bag between the laying object and the support,
After fixing the bag body to the support with an adhesive, etc.,
The air inside the bag body is sucked to make the inside of the bag body a negative pressure state ,
After bringing the bag into close contact with the support,
Injecting a caking material into the bag and inflating it,
Construction method for foundations for laying objects.

In the construction method of the foundation for laying objects according to claim 1,
Inject a caking material into the bag,
It is characterized by inflating until the covering material is broken,
Construction method for foundations for laying objects.