JP2008095417A - Environmentally-considered floating body type marine structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily movable or extendable floating body type marine structure considering environment, and its construction method. <P>SOLUTION: This environmentally-considered floating body type marine structure K comprises a foundation B including the required number of hollow block bodies 1 disposed at predetermined spaces. The hollow block bodies 1 have pile holes 2 formed penetrating in a predetermined array, and joining protrusion parts 3 protrusively formed at the peripheral edge parts. The hollow block bodies 1 are supported in a half-diving manner by rotational penetrating type piles 10 disposed in the pile holes 2, and the adjacent joining protrusion parts 3, 3 are joined to each other by an extensible joint member 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an environment-friendly floating offshore structure and a construction method thereof. More specifically, the present invention relates to an environmentally friendly floating offshore structure that can minimize the adverse effects on ocean currents and the seabed and its construction method.

  Conventionally, when a marine structure such as an airport is constructed on the sea, a necessary ground, that is, a site is generally secured by reclaiming a sea area where the airport is constructed.

  However, when landfilling is performed, there is a problem in that marine organisms in the landfilled sea area are killed and marine pollution due to landfilled sediment is caused. In addition, there is a problem that it cannot be relocated and cannot be easily expanded. Furthermore, there is a problem that even if a marine structure such as an airport becomes unnecessary, it cannot be restored.

  Offshore structures such as a marine airport using a mega float system or a marine deck system have been proposed as a system that eliminates the disadvantages of the landfill system and considers the seafloor environment.

  However, in the former case of the mega float method, it is necessary to secure a still water area, and therefore there is a problem that it is necessary to construct a breakwater offshore where the mega float is installed. Another problem is that the marine environment changes due to the construction of the breakwater.

  On the other hand, in the latter case, there is a problem that the construction period is prolonged and the construction cost is expensive because most of the construction work is performed at sea. There is also a problem that relocation is not easy.

Patent Document 1 proposes a pier-type large-scale offshore structure equipped with a daylighting section. However, no proposal has been made for reducing the environmental load of a floating-type large-scale offshore structure. Absent.
JP-A-11-334585

  The present invention has been made in view of the problems of the prior art, and an object thereof is to provide a floating offshore structure that is environmentally friendly and that can be easily moved and expanded, and a construction method therefor.

  The first form of the environmentally friendly floating offshore structure of the present invention is an environmentally friendly floating offshore structure comprising a foundation including a required number of hollow block bodies arranged at predetermined intervals. The hollow block body has a pile hole penetratingly formed in a predetermined arrangement, and a joint projecting portion projectingly formed at a peripheral edge portion, and the hollow block body is a rotary penetration disposed in the pile hole. The semi-submersible type is supported by the mold pile, and adjacent joint protrusions are joined by a joint member having elasticity.

  The second embodiment of the environmentally-friendly floating offshore structure of the present invention is provided on a lower base body composed of a required number of hollow block bodies arranged at a predetermined interval and on the lower base body. An environmentally friendly floating offshore structure comprising a foundation including an upper foundation body, wherein the hollow block body has pile holes formed through in a predetermined arrangement, and the upper foundation body has a peripheral edge The hollow block body is supported by a semi-submersible type by a rotary penetrating pile disposed in the pile hole, and adjacent joint protrusions are stretchable. It is characterized by being joined by a joining member having

  In the 1st and 2nd form of the environmental consideration type floating offshore structure of this invention, it is preferable that the hollow block body in which the light well was formed was contained.

  In the second embodiment of the environmentally-friendly floating offshore structure of the present invention, it is preferable that a light introduction path that communicates from the upper foundation to the light well is provided.

  Furthermore, in the first and second embodiments of the environment-friendly floating offshore structure of the present invention, the aperture ratio by the light well is preferably 4% to 10% of the total surface area of the foundation.

  Furthermore, in the 1st and 2nd form of the environmental consideration type floating body type offshore structure of this invention, it is preferable that a hollow block body is supported by the rotation penetration type | mold pile so that transfer is possible.

  The first embodiment of the construction method of the environment-friendly floating offshore structure of the present invention is an environment-friendly floating offshore structure comprising a foundation including a required number of hollow block bodies arranged at predetermined intervals. A procedure for producing a hollow block body at a production base where seawater can be drawn in, a procedure for floating the hollow block body on the sea, a procedure for towing the suspended hollow block body to the laying sea area, It includes a procedure for positioning and temporarily fixing the hollow block body, a procedure for supporting the hollow block body with a rotary penetrating pile, and a procedure for joining adjacent hollow block bodies together.

  The second embodiment of the construction method of the environment-friendly floating offshore structure according to the present invention is an environment-friendly floating offshore structure comprising a foundation including a required number of hollow block bodies arranged at predetermined intervals. A procedure for producing a hollow block body at a production base where seawater can be drawn in, a procedure for floating the hollow block body on the sea, a procedure for towing the suspended hollow block body to the laying sea area, A procedure for positioning and temporarily fixing the hollow block body, a procedure for constructing the lower foundation body by supporting the hollow block body with a rotary penetrating pile, a procedure for constructing the upper foundation body on the lower foundation body, And a procedure for joining the upper base bodies to each other.

  According to the present invention, it is possible to obtain an excellent effect that a large-scale offshore structure can be constructed while minimizing the influence on the ocean current and the seafloor environment.

  According to the preferred embodiment of the present invention, since the light well is provided, it is possible to allow sunlight to reach the seabed and to obtain an excellent effect that the influence on the seafloor environment can be further reduced.

  Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

Embodiment 1
1 and 2 show an environmentally friendly floating offshore structure (hereinafter simply referred to as a structure) according to Embodiment 1 of the present invention.

  As shown in FIG. 1 and FIG. 2, the structure K is formed by laying the hollow block bodies 1 having the same size in a predetermined arrangement with a certain gap by a semi-submersible type, and then joining them together. The foundation B of the structure K is formed, and then a surface embankment T is performed on the foundation B to construct a runway or an airport terminal.

  Here, the reason why a certain gap is provided between the hollow block bodies 1 and 1 is to ensure the flow of seawater between the hollow block bodies 1 and 1. The reason why the hollow block body 1 is semi-submersible is to ensure the flow of seawater between the bottom surface of the hollow block body 1 and the sea bottom. In other words, this is to minimize the impact on ocean currents while minimizing the impact on ocean currents.

  As shown in FIG. 2 and FIG. 3, the hollow block body 1 includes a pile hole 2 for inserting a pile 10 for positioning the hollow block body 1, and a joint protrusion portion 3 formed to protrude over the entire periphery of the peripheral portion. It is supposed to be prepared.

  Further, as shown in FIGS. 2 and 3, some of the hollow block bodies 1 </ b> A are also provided with a light well 4 for allowing a certain amount of light to reach the seabed.

  In addition, although the upper surface of the hollow block bodies 1 and 1A is made into the substantially flat, the location where the light well 4 is provided is not shown clearly, but the embedding by the concrete is made to the embankment surface T Yes.

  The size of the hollow block bodies 1 and 1A is, for example, 50 m in length, 50 m in width, and 25 m in height, but is not limited thereto, and is appropriately sized according to the purpose. Moreover, the protrusion amount of the joint protrusion 3 is set such that the gap between the adjacent protrusions 3 of the hollow block bodies 1 is twice or more the horizontal maximum deformation amount during an earthquake. In this gap, a joint member 5 having elasticity, for example, an expansion joint generally used for a joint portion of a bridge, is disposed, and adjacent hollow block bodies 1 and 1 are joined to each other. In the first embodiment, the gap is set to 0.2 m.

  The hollow block body 1 is preferably made of concrete from the viewpoint of production and durability, but may be made of steel plate.

  The volume of the hollow portion is basically planned so that the buoyancy sufficient for the surface of the hollow block body 1 to protrude a predetermined height from the sea surface is obtained. The hollow interior can be used as, for example, a parking lot or a hangar. In addition, predetermined height from the sea surface of the hollow block body 1 surface can be adjusted with a float.

  In the illustrated example, four light wells 4 having a daylighting surface of 10 m square are arranged densely in the center. The size and number of the light wells 4 are not limited to those shown in the drawings, but can be appropriately sized and number according to the purpose, and the arrangement is not limited to a dense shape, but is scattered. It can also be arranged.

  However, the aperture ratio of the light well 4 occupying the total surface area of the base is in the range of 4% to 10% from the viewpoint of avoiding unnecessary intensity reduction while allowing the minimum necessary amount of sunlight to reach the ocean floor. Is good.

  Although not clearly shown in the light well 4, the wall surface of the light well 4 is a mirror surface in order to avoid a decrease in the amount of light that is absorbed by the wall surface of the light well 4 and reaches the seabed, for example, an acrylic resin plate Is arranged. That is, the inner wall of the light well 4 is a mirror surface. In addition, the part which exists under the sea surface of the light well 4 may be made into a mirror surface only in the location which exists on the sea surface from the place where reflectance falls by generation | occurrence | production of algae etc. with progress of installation time.

  In addition, the light well 4 is provided with a lid (plane lattice) 4a in the form of a lattice to prevent falling.

  In the illustrated example, 25 pile holes 2 are arranged in a grid pattern. That is, the vertical and horizontal directions are arranged at intervals of 10 m.

  The pile 10 has a blade at the tip, and the so-called rotary penetrating pile, for example, Nippon Steel Ecopile (product of the NS Name). The reason for using such a pile 10 is to suppress generation of vibration and generation of discharged earth and sand so that marine pollution due to muddy water and residual soil does not occur as much as possible.

  4 and 5 show a state where the pile 10 is inserted into the pile hole 2. FIG. 4 shows a state in which the pile is in the transport position. As shown in FIG. 4, the stopper 10 for conveyance is provided in the pile 10 middle part appropriate position, and the pile 10 is made into a conveyance position by latching this stopper 6 for conveyance to the periphery of the pile hole 2. As shown in FIG. FIG. 5 shows a state in which the hollow block body 1 is laid and the pile 10 is in a fixed position. As shown in FIG. 6, the pile head 10a is fixed to the pile hole upper end part 2a with concrete, and the pile 10 is fixed. A plurality of steel bands 11 are fixed to the pile head 10a in order to increase the adhesion to concrete.

  Next, the construction of the structure K having such a configuration will be described with reference to FIGS.

  Procedure 1: The hollow block body 1 in which the pile 10 is set at the transport position is manufactured at a manufacturing base adjacent to the coast where seawater such as a dock can be drawn.

  Procedure 2: After drawing seawater into the production base, the hollow block body 1 is moved from the production base to the sea. That is, the hollow block body 1 is floated on the sea.

  Procedure 3: Tow the suspended hollow block body 1 to the laying sea area.

  Procedure 4: After positioning the hollow block body 1 at the laying position, it is temporarily fixed at the laying position by anchoring.

  Procedure 5: Remove the transport stopper 6.

  Procedure 6: The pile 10 is lowered, the tip of the pile 10 is inserted into the seabed, the pile hole upper end 2a is filled with concrete, and the pile head 10a is fixed to the hollow block body 1. Thereby, the hollow block body 1 is fixed in a semi-submersible state.

  Procedure 7: When the laying of the predetermined number of hollow block bodies 1, 1, 1... Is completed, the hollow block bodies 1, 1 are joined to each other.

  Procedure 8: Surface embedding T is performed at a place where a runway or a terminal building is provided.

  Thereafter, a runway and a terminal building are constructed by a general construction method, and the structure K is completed.

  In addition, when removing the structure K by the change of circumstances etc., removal is made by the reverse procedure of the said procedure in general (refer FIG.8 (d)). Moreover, when transferring the removed thing and constructing the structure K1, the said procedure is repeated (refer FIG.8 (d), (e)).

Embodiment 2
A second embodiment of the present invention is shown in FIGS. The second embodiment is a modification of the first embodiment. In order to increase the level from the sea surface such as a runway or an airport terminal, the upper base body 20 is formed on the lower base body 24 formed of a hollow block body. After constructing, the upper foundation bodies 20, 20 are joined together to form the foundation of the structure K2, and then a surface embankment T is performed on the foundation to construct a runway, an airport terminal, etc. Is done.

  The lower base body 24 is a semi-submersible type of a hollow block body 1B that is the same as the hollow block body 1 of the first embodiment except that the joint projecting part is not projected at the peripheral edge. It shall be fixed.

  The upper base body 20 includes a ceiling portion 21 on which a runway, an airport terminal, and the like are constructed by performing surface embedding T, a leg portion 22 that supports the ceiling portion 21, and a joint protrusion formed by extending the ceiling portion 21. 23 as a main part. The upper foundation body 20 is constructed on the sea by the same construction method as a general reinforced concrete structure.

  The ceiling portion 21 of the upper base body 20 corresponding to the lower base body 24 having the light well 4 is provided with a light introduction path 25 communicating with the light well 4 of the lower base body 24. The inner surface of the light introduction path 25 is also preferably a mirror surface. In addition, although not shown, a surface lattice is provided at the upper end of the light introduction path 25.

  In addition, it may replace with the light introduction path 25, and may just be provided with an optical window. In that case, from the viewpoint of equalizing the amount of sunlight that reaches the light well 4, the size of the light window is preferably increased by a certain amount, for example, about 10% to 20%.

  Next, the construction of the structure K2 having such a configuration will be described. Since the construction of the lower base body 24 is substantially the same as that of the first embodiment, the following description will be focused on differences from the first embodiment.

  Procedure 1: After the lower base body 24 is fixed at a predetermined position, the upper base body 20 is constructed thereon. At the time of this construction, the light introduction path 25 is also formed.

  Procedure 2: The upper base bodies 20 and 20 are joined to each other by the expansion joint 25.

  Procedure 3: Surface embedding T is performed at a place where a runway and a terminal building are provided.

  Hereinafter, the construction of the runway or the terminal building is made by a general construction method, and the structure K2 is completed.

  Thus, in this Embodiment 2, since the level from the sea surface, such as a runway and an airport terminal, is made high, compared with Embodiment 1, the possibility that a runway etc. will be flooded by a high wave falls remarkably.

  INDUSTRIAL APPLICABILITY The present invention can be applied to floating structures on the sea in consideration of the environment and the construction thereof.

It is the schematic of the structure which concerns on Embodiment 1 of this invention, Comprising: The same (a) shows a top view, The same (b) shows a side view. It is the same fragmentary sectional view. It is a top view of the hollow block body which has the light well used for the structure. It is explanatory drawing during the sea transport of the hollow block body used for the structure. It is explanatory drawing of the state which laid the hollow block body on the sea. It is a pile head detailed drawing of the same hollow block body, (a) shows a top view and (b) shows a sectional view. It is explanatory drawing that the load to the seabed by the structure which concerns on Embodiment 1 of this invention is small. It is a schematic process drawing of construction of a structure concerning Embodiment 1 of the present invention, removal, and transfer. It is explanatory drawing in the sea transport of the hollow block body which concerns on Embodiment 2 of this invention. It is the schematic of the structure of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow block body 2 Pile hole 2a Pile hole upper end part 3 Joint protrusion part 4 Light well 5 Joint member 6 Transport stopper 10 Pile 10a Pile head 11 Steel band 20 Upper foundation body 24 Lower foundation body 25 Light introduction path K Structure B foundation T surface embankment

Claims (8)

An environmentally friendly floating offshore structure comprising a foundation including a required number of hollow block bodies arranged at predetermined intervals,
The hollow block body has a pile hole penetratingly formed in a predetermined arrangement, and a joint protrusion formed to protrude at the peripheral edge,
The hollow block body is supported by a semi-submersible type by a rotary penetrating pile disposed in the pile hole,
Adjacent joint protrusions are joined by a stretchable joining member, an environmentally friendly floating offshore structure. An environmentally-friendly floating body type sea that has a foundation including a lower foundation body including a required number of hollow block bodies arranged at predetermined intervals and an upper foundation body arranged on the lower foundation body A structure,
The hollow block body has a pile hole formed through in a predetermined arrangement,
The upper base body has a joint protrusion formed to protrude from the peripheral edge,
The hollow block body is supported by a semi-submersible type by a rotary penetrating pile disposed in the pile hole,
Adjacent joint protrusions are joined to each other by a joining member having elasticity, and this is an environmentally friendly floating offshore structure.   3. The environmentally friendly floating offshore structure according to claim 1 or 2, wherein a hollow block body in which a light well is formed is included.   4. The environment-friendly floating offshore structure according to claim 3, further comprising a light introduction path communicating from the upper foundation to the light well.   4. The environmentally friendly floating offshore structure according to claim 3, wherein the aperture ratio by the light well is 4% to 10% of the total surface area of the foundation.   The environment-friendly floating body type offshore structure according to claim 1 or 2, wherein the hollow block body is supported by a rotary penetrating pile so as to be relocatable. A construction method for an environmentally friendly floating offshore structure comprising a foundation including a required number of hollow block bodies arranged at predetermined intervals,
The procedure for producing a hollow block body at a production base where seawater can be drawn,
A procedure for floating the hollow block body on the sea;
A procedure for towing a suspended hollow block body to a laying sea area;
A procedure for positioning and temporarily fixing the hollow block body;
The procedure for supporting the hollow block body by a rotary penetrating pile,
The construction method of the environmental consideration type floating offshore structure characterized by including the procedure of joining adjacent hollow block bodies mutually. A construction method for an environmentally friendly floating offshore structure comprising a foundation including a required number of hollow block bodies arranged at predetermined intervals,
The procedure for producing a hollow block body at a production base where seawater can be drawn,
A procedure for floating the hollow block body on the sea;
A procedure for towing a suspended hollow block body to a laying sea area;
A procedure for positioning and temporarily fixing the hollow block body;
A procedure for constructing a lower foundation body by supporting a hollow block body with a rotary penetrating pile,
The procedure to build the upper foundation on the lower foundation;
A method for constructing an environmentally-friendly floating offshore structure characterized in that it includes a procedure for joining adjacent upper foundations together.

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