JP6575459B2 - Implantable foundation and construction method - Google Patents

Description

  The present invention relates to a floor foundation and a method for constructing a floor foundation. INDUSTRIAL APPLICABILITY The present invention can be suitably used as a landing-type foundation for offshore wind power generation facilities and a construction method thereof.

  For the foundation structure of offshore wind power generation equipment, the optimal structure type is selected according to the conditions such as water depth and ground, but the selected structure type is roughly divided into “floor type” and “floating type” Can do. The choice of “landing” or “floating” is mainly based on the water depth.

  Pile-type foundations and gravity-type foundations are the main foundation types of the “flooring type” (see, for example, Non-Patent Documents 1 and 2). There are several types of pile-type foundations, but if the ground is somewhat hard up to a depth of about 30m, a monopile structure is often used, and if the ground is soft up to a depth of about 60m, a jacket structure is used. Is often used. Gravity foundations are often used when it is difficult to place piles at a relatively shallow depth (up to a depth of about 30 m), where the bottom of the seabed is hard.

  However, as a result of selecting an optimal structure format according to conditions such as water depth and ground, a structure format that should be referred to as a hybrid type having characteristics of a plurality of classifications among the above classifications has also appeared.

  For example, Non-Patent Document 3 reports an empirical study on a hybrid structure in which a jacket structure is combined with a concrete gravity foundation.

“Draft of technical guidelines for offshore wind power generation facilities in harbors”, March 2015, Ministry of Land, Infrastructure, Transport and Tourism Port Authority "Guidebook for introduction of offshore wind power generation (first edition)", September 2015, New Energy and Industrial Technology Development Organization Inukai Inori, 3 others, “Establishment of design technology for offshore wind power generation facilities”, Nippon Steel & Sumikin Engineering Technical Report, Nippon Steel & Sumikin Engineering Co., Ltd., 2013, Volume 4, p.30-38

  The present inventor has proceeded with a study on a hybrid structure (hereinafter, simply referred to as “hybrid structure”) in which a concrete gravity foundation is combined with a jacket structure as described in Non-Patent Document 3. As a result, it was determined that the hybrid structure as described in Non-Patent Document 3 may have the following problems depending on the conditions of the installation location.

(1) The wind turbines of offshore wind power generation facilities are moving in the direction of increasing their size. In the case of gravity foundations, it is necessary to increase their weight in order to cope with them, but when the weight increases, Work vessels for offshore installation that can handle this weight are limited, which is a constructional constraint. Work vessels include self-elevating work platform vessels (hereinafter sometimes referred to as SEP vessels; SEP is an abbreviation for Self Elevating Platform) and hoisting vessels. It can be used, but its suspension capacity is small. On the other hand, the hoist ship has a large suspension capacity, but usable sea conditions are limited.

  When the weight of the object to be lifted increases, for example, a hoist ship must be used. However, as described above, the use of the hoist ship is limited in the sea conditions that can be used. It may be limited to a certain day, and this is also a restriction on construction.

(2) To stabilize the gravity foundation, it is necessary to increase the weight, but increasing the weight of the gravity foundation increases the seismic load. Further, when the weight of the gravity foundation is increased, the outer shape of the gravity foundation is increased. However, as the outer shape and the weight are increased, the wave load is increased in proportion thereto. For this reason, there may be a situation where the problem of stabilizing the gravity foundation cannot be solved only by increasing the weight of the gravity foundation.

(3) Regarding the installation of the foundation structure of offshore wind power generation facilities, from the viewpoint of ensuring the performance of the wind turbine installed in the foundation structure, the foundation structure that joins the wind turbine tower (a vertical member that maintains the wind turbine at a predetermined height) Strict accuracy control is required for the level of the upper flange flange surface. On the other hand, since the gravity foundation has a structure that is directly installed on the foundation rubble mound, the level of the foundation rubble mound directly affects the level of the joint flange surface. For this reason, it is necessary to strictly adjust the height and level by controlling the leveling of the foundation rubble mound, but the sea conditions are not constant, and there are limits to the level and height management of the foundation rubble mound. There is. In addition, in order to perform full-scale offshore wind power generation, the number of installed wind turbine facilities increases. However, as the number of installed wind turbine facilities increases, a great deal of effort is required to manage the level and height of the foundation rubble mound. This is assumed.

  In addition, as it relates to the matter described in (1) above, reducing the weight of the members for the foundation structure that require lifting and moving during installation will lead to improved workability. The same applies to not only gravity foundations but also other foundation types (for example, suction foundations). Furthermore, the management of the level of the upper end portion of the foundation structure joined to the upper structure such as a wind turbine tower is important not only for the gravity type foundation but also for other foundation types (for example, a suction foundation).

  The present invention has been made in view of such points, and can reduce the weight of a member for a foundation structure that needs to be lifted or moved during installation, and has a desired installation posture and height. It is an object of the present invention to provide a floor foundation and a construction method for a floor foundation that are easy to install and install so as to be in the right position.

  This invention solves the said subject with the construction method of the following landing type foundations and flooring type foundations.

  That is, the first aspect of the flooring foundation according to the present invention is a flooring foundation having a gravity foundation disposed on a rubble mound and a jacket attached to the gravity foundation. The gravity-type foundation is integrally provided with a connecting sheath tube having an inner space at least opened upward, the jacket has a leg extending downward, and the leg is the connecting sheath tube. The leg inserted into the connecting sheath and the pipe is integrated with the connecting sheath pipe into which the leg is inserted.

  Here, in the present application, the jacket is a general term for a frame structure mainly composed of steel members, and the number of legs of the jacket is not particularly limited, and the number of tripods or legs having three legs is one. A book monopole is also included in the jacket. Further, the number of jacket legs may be four or more.

  In addition, “the gravity foundation is integrally provided with a connecting sheath tube having an inner cavity that is open at least upward” means that the gravity foundation is an inner cavity that is open at least upward. Means that the connecting sheath tube is integrated with the gravitational foundation, and in other parts of the present application, the term “provided integrally” is similarly used. Shall be interpreted.

  In the first aspect of the flooring foundation, the gravity foundation includes a plurality of the connecting sheath pipes having an inner space that is open at least upward, and the jacket includes the legs. The leg and the connecting sheath tube are arranged so that one of the plurality of connecting sheaths corresponds to each position of the plurality of legs. Each may be configured to be inserted into the corresponding connecting sheath.

  The connecting sheath pipe is preferably provided with flanges at the upper end and the lower end.

  The gravity foundation includes bottom slab concrete forming a bottom surface, and the connecting sheath pipe has a portion protruding above the top surface of the bottom slab concrete, but does not have a portion protruding below the bottom surface. You may comprise.

  Here, the bottom slab concrete is a plate-shaped member having concrete as a main component, and may be, for example, a plate made of reinforced concrete or a composite plate of steel and concrete. In other parts of the present application, the bottom slab concrete shall be interpreted similarly.

  The gravitational foundation may include bottom slab concrete that forms a bottom surface, and the connecting sheath pipe may be disposed so as to fit between an upper surface and a lower surface of the bottom slab concrete.

  The gravitational foundation includes a bottom slab concrete forming a bottom surface, and an outer peripheral wall body provided on an upper surface of the bottom slab concrete so as to follow an outer periphery of the bottom slab concrete, and is surrounded by the outer peripheral wall body and the bottom slab concrete. The space thus formed may be configured to hold the inserted filling material.

  Here, “to be along the outer periphery of the bottom slab concrete” as long as it is disposed along the outer periphery of the bottom slab concrete when viewed from above, until the height position is the same. This is a concept that does not matter, and the same applies to the description of other parts of the present application.

  The gravity foundation includes an outer peripheral wall body provided on the upper surface of the bottom slab concrete so as to follow the outer periphery of the bottom slab concrete, and an end portion in the longitudinal direction of the outer peripheral wall body is connected to an outer peripheral surface of the connecting sheath pipe. The outer peripheral wall body, the outer peripheral surface of the connecting sheath pipe, and the space surrounded by the bottom slab concrete may be configured to hold the inserted filling material.

  A second aspect of the flooring foundation according to the present invention is a flooring foundation comprising a suction foundation installed at the bottom of the water and a jacket attached to the suction foundation, Is integrally provided with a connecting sheath pipe having at least an inner space that is open at the top, the jacket has a leg extending downward, and the leg is inserted into the connecting sheath pipe, and The leg inserted into the connecting sheath tube is a grounded foundation that is integrated with the connecting sheath tube inserted therein.

  In the second aspect of the flooring foundation, the suction foundation includes a plurality of the connecting sheath pipes having at least an inner space that is open at the top, and the jacket includes the legs. The leg and the connecting sheath tube are arranged so that one of the plurality of connecting sheaths corresponds to each position of the plurality of legs. Each may be configured to be inserted into the corresponding connecting sheath.

  A third aspect of the floor foundation according to the present invention is a floor foundation including a plurality of suction foundations installed on the bottom of the water and a jacket attached to the plurality of suction foundations. Each of the plurality of suction foundations is integrally provided with a connecting sheath tube having at least an inner space that is open at the top, and the jacket has a plurality of legs extending downward, and each of the plurality of legs The leg and the suction foundation and the connecting sheath tube are arranged so that one of the plurality of connecting sheath tubes corresponds to the position, and each of the plurality of legs corresponds to the corresponding connecting member. Each of the legs inserted into the connecting sheath tube and the leg inserted into the connecting sheath tube is integrated with the connecting sheath tube into which the leg is inserted. Chakuyukashiki is the basis.

  The gap between the connecting sheath and the leg inserted into the connecting sheath may be filled with a grout material.

  A liner member for adjusting the position of the jacket may be disposed between the lower surface of the inner space portion of the connecting sheath and the leg.

  According to a first aspect of the method for constructing a floor foundation according to the present invention, a gravity foundation that is integrally provided with a connecting sheath pipe having an inner space that is open at least upward is sunk on a rubble mound. Inserting the leg of the jacket, the leg of the jacket into the connecting sheath of the gravitational foundation submerged on the rubble mound in the foundation installing step, and the connecting sheath tube in the inserting step And an integration step of integrating the leg with the connecting sheath tube into which the leg is inserted, and in the insertion step, the jacket is arranged at a predetermined height in a predetermined posture. The leg is inserted into the connecting sheath pipe, and a method for constructing a flooring foundation is provided.

  According to a second aspect of the method for constructing a floor foundation according to the present invention, at least a gravity foundation including a plurality of connecting sheath pipes having an inner space that is open at the top is set on a rubble mound. A foundation installation step, and a step of inserting each of the plurality of legs of the jacket into the corresponding sheathing pipes of the gravity foundation submerged on the rubble mound in the foundation installation step, and the insertion step And integrating the leg inserted into the connecting sheath tube with the connecting sheath tube into which the leg is inserted, and in the inserting step, the jacket has a predetermined posture in a predetermined posture. A method for constructing a flooring type foundation, wherein each of the plurality of legs is inserted into the corresponding connecting sheath pipe so as to be arranged at a height position.

  A third aspect of the method for constructing a flooring foundation according to the present invention is a foundation installation step in which a suction foundation that is integrally provided with a connecting sheath pipe having an inner space that is open at the top is installed on the bottom of the water. And an insertion step of inserting the leg of the jacket into the connection sheath of the suction foundation installed on the water bottom in the foundation installation step, and the leg inserted into the connection sheath tube in the insertion step, An integration step of integrating with the connecting sheath tube into which the leg is inserted, and in the insertion step, the leg is placed at a predetermined height position in a predetermined posture. It is a construction method of a grounding foundation characterized by being inserted into a connecting sheath.

  A fourth aspect of the method for constructing a floor foundation according to the present invention is a foundation installation in which a suction foundation provided integrally with a plurality of connecting sheath pipes having at least an inner space that is open at the top is installed on the bottom of the water. A step of inserting each of the plurality of legs of the jacket into the corresponding connecting sheath pipe of the suction foundation installed on the bottom of the water in the foundation installing step, and the connecting sheath tube in the inserting step. An integration step of integrating the leg inserted into the connecting sheath tube into which the leg is inserted, and in the insertion step, the jacket is disposed at a predetermined height in a predetermined posture. As described above, a method for constructing a floor foundation is characterized in that each of the plurality of legs is inserted into the corresponding connecting sheath.

  According to a fifth aspect of the method for constructing a landing-type foundation according to the present invention, a plurality of suction foundations each integrally provided with a connecting sheath pipe having an inner space that is open at least above are installed on the bottom of the water. A base installation step, and a step of inserting each of the plurality of legs of the jacket into the corresponding connecting sheath pipes of the plurality of suction foundations installed on the water bottom in the base installation step, and the insertion step. An integration step of integrating the leg inserted into the connecting sheath tube with the connecting sheath tube into which the leg is inserted, and in the inserting step, the jacket is in a predetermined posture and at a predetermined height. It is a construction method for a flooring foundation, wherein each of the plurality of legs is inserted into the corresponding connecting sheath pipe so as to be arranged at a position.

  According to a sixth aspect of the method for constructing a flooring foundation according to the present invention, a gravity foundation integrally including a connecting sheath pipe having an inner space that is open at least upward is sunk on a rubble mound. Based on the results of measurement in the foundation installation step, the measurement step of measuring the height position and the inclination of the connection sheath of the gravitational foundation set on the rubble mound in the foundation installation step, and the measurement step If necessary, a liner member installation step of installing a liner member on one or both of the lower end of the leg of the jacket and the lower surface of the inner space of the connecting sheath, and the leg of the jacket A step of inserting into the connecting sheath of the gravitational foundation submerged on the rubble mound in the foundation installation step, and before being inserted into the connecting sheath tube in the inserting step Leg to a method for constructing a landing foundations, characterized in that it comprises a integral step itself integral with the connecting sheath pipe plugged, the.

  According to a seventh aspect of the present invention, there is provided a gravitational foundation comprising a plurality of connecting sheath pipes each having an inner space that is open at least on the rubble mound. A foundation installation step, a measurement step for measuring the height positions and inclinations of the plurality of connecting sheaths of the gravity foundation set on the rubble mound in the foundation installation step, and a measurement in the measurement step. Based on the result, a liner member that installs a liner member on one or both of the lower end of the leg of the jacket having a plurality of legs and the lower surface of the inner hollow portion of the connecting sheath as needed The installation step and each of the plurality of legs of the jacket are respectively inserted into the corresponding connecting sheath pipes of the gravity foundation submerged on the rubble mound in the foundation installation step. And an integration step of integrating the leg inserted into the connecting sheath pipe in the inserting step with the connecting sheath tube into which the leg is inserted. It is a construction method of formula foundation.

  According to an eighth aspect of the method for constructing a flooring foundation according to the present invention, a foundation installation step is provided in which a suction foundation that is integrally provided with a connecting sheath pipe having an inner space that is open at the top is installed on the bottom of the water. And, based on the measurement step of measuring the height position and inclination of the connecting sheath and pipe of the suction foundation installed on the bottom of the water in the foundation installation step, and the results measured in the measurement step, if necessary, A liner member installation step for installing a liner member on one or both of the lower end of the leg of the jacket and the lower surface of the inner space of the connecting sheath tube; and the foundation installation step for the leg of the jacket The insertion step of inserting into the connection sheath of the suction foundation installed at the bottom of the water and the leg inserted into the connection sheath tube in the insertion step are different from each other. A method for constructing a landing foundations, characterized in that it comprises a integration step of integrating said connecting sheath tubes written, the.

  According to a ninth aspect of the method for constructing a flooring foundation according to the present invention, a foundation installation in which a suction foundation having a plurality of connecting sheath pipes having at least an inner space that is open at the top is installed on the bottom of the water. Necessary on the basis of the results measured in the measurement step, the measurement step of measuring the plurality of connecting sheaths of the suction foundation installed on the bottom of the water in the foundation installation step, and the height position and inclination of the pipe, respectively. A liner member installation step of installing a liner member on one or both of a lower end of the leg of the jacket having a plurality of legs and a lower surface of the inner space of the connecting sheath; and the jacket And inserting each of the plurality of legs into the corresponding connecting sheath pipes of the suction foundation installed on the water bottom in the foundation installation process, An integration step of integrating the leg inserted into the connecting sheath tube in the inserting step with the connecting sheath tube inserted therein; It is.

  According to a tenth aspect of the method for constructing a flooring foundation according to the present invention, a foundation for installing a plurality of suction foundations integrally provided with a connecting sheath pipe having an inner space that is open at least on the bottom is provided. Based on the results of the installation process, the measurement process of measuring the connection sheath and the height position and inclination of the pipes of the plurality of suction foundations installed on the water bottom in the foundation installation process, and the measurement results in the measurement process, A liner member installation step of installing a liner member on one or both of the lower end of the leg of the jacket having a plurality of legs and the lower surface of the inner space of the connecting sheath as needed, and Inserting work for inserting each of the plurality of legs of the jacket into the corresponding connecting sheath pipes of the suction foundation installed on the water bottom in the foundation installation step And an integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted. It is a construction method.

  In the first to tenth aspects of the method for constructing a flooring foundation according to the present invention, a grout material is provided in the gap between the connecting sheath tube and the leg inserted into the connecting sheath tube in the integration step. May be filled.

  According to the floor foundation and the method for constructing a floor foundation according to the present invention, it is possible to reduce the weight of a member for a foundation structure that needs to be lifted or moved during installation work, It is easy to install and install the flooring foundation so that it is in the installation posture and height position.

The front view of the offshore windmill 60 for wind power generation which applied the floor type foundation 10 which concerns on 1st Embodiment of this invention. The front view which expands and shows the site | part of the landing type foundation 10 of the offshore windmill 60 III-III sectional view of FIG. The side view of the caisson 12 of the landing type foundation 10 which concerns on 1st Embodiment of this invention. The perspective view which similarly shows the external appearance of the caisson 12 A perspective view of the caisson 12 also showing the portion embedded in the bottom slab concrete 12A (described by a solid line) Side view of jacket 14 of floor type foundation 10 according to the first embodiment of the present invention. Enlarged vertical sectional view of the vertical portion 14A1 of the leg 14A Exploded vertical sectional view of liner member 16 Top view of liner 16D viewed from above Top view of liner 16E viewed from above The side view which shows typically the 1 process which installs the floor type foundation 10 which concerns on 1st Embodiment of this invention. The side view which shows typically the 1 process which installs the floor type foundation 10 which concerns on 1st Embodiment of this invention. The side view which shows typically the 1 process which installs the floor type foundation 10 which concerns on 1st Embodiment of this invention. The side view which shows typically the 1 process which installs the floor type foundation 10 which concerns on 1st Embodiment of this invention. Front view of a floor foundation 20 according to a second embodiment of the present invention. XVII part enlarged view of FIG. XVIII-XVIII line sectional view of FIG. XIX-XIX sectional view of FIG. Exploded vertical sectional view of liner member 25 and related members Plan view of liner 25C viewed from below Plan view of liner 25D viewed from below Front view of an offshore wind turbine 80 for wind power generation to which a floor foundation 30 according to a third embodiment of the present invention is applied. The front view which expands and shows the site | part of the landing type foundation 30 of the offshore windmill 80 XXV-XXV line sectional view of FIG. The side view of the suction foundation 32 of the landing type foundation 30 which concerns on 3rd Embodiment of this invention. Side view of the jacket 14 of the landing-type foundation 30 according to the third embodiment of the present invention. The side view which shows typically the 1 process which installs the floor type foundation 30 which concerns on 3rd Embodiment of this invention. The side view which shows typically the 1 process which installs the floor type foundation 30 which concerns on 3rd Embodiment of this invention. The side view which shows typically the 1 process which installs the floor type foundation 30 which concerns on 3rd Embodiment of this invention. The side view which shows typically the 1 process which installs the floor type foundation 30 which concerns on 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment (1-1) Configuration of First Embodiment FIG. 1 is a front view of an offshore wind turbine 60 for wind power generation to which a flooring foundation 10 according to a first embodiment of the present invention is applied. FIG. 2 is an enlarged front view showing a portion of the landing-type foundation 10 of the offshore wind turbine 60.

  The offshore wind turbine 60 for wind power generation includes a floor foundation 10 and a wind turbine body 62, and the wind turbine body 62 is supported by the floor foundation 10. The windmill main body 62 includes a windmill tower 64, a hub 66, and a blade 68.

  The floor foundation 10 according to the first embodiment of the present invention includes a caisson (gravity foundation) 12 disposed on a rubble mound 90 and a jacket 14 supported by the caisson (gravity foundation) 12. Have. The caisson 12 is a gravity foundation that stabilizes the installation position by its own weight and stably supports the wind turbine main body 62 that is an upper structure.

  3 is a cross-sectional view taken along line III-III in FIG. 2, FIG. 4 is a side view of the caisson 12 of the floor foundation 10 according to the first embodiment, and FIG. FIG. 6 is a perspective view of the caisson 12 in which the portion embedded in the bottom slab concrete 12A is also described (described by a solid line).

  As shown in FIGS. 3 to 6, the overall shape of the caisson 12 is a flat plate, and the shape seen from above is a square. As shown in FIGS. 5 and 6, the caisson 12 includes a bottom slab concrete 12A, four connecting sheath pipes 12B, an outer peripheral wall body 12C, and an internal partition wall 12D, as shown in FIG. In addition, the bottom slab concrete 12 </ b> A is disposed so that the bottom surface of the bottom slab concrete 12 </ b> A contacts the upper portion of the rubble mound 90, and the caisson 12 is disposed on the rubble mound 90.

  Slab slab concrete is provided at the four corners of the square bottom slab concrete 12A so that the connecting sheath 12B protrudes upward from the upper surface of the bottom slab concrete 12A and does not protrude downward from the lower surface of the bottom slab concrete 12A. The upper surface of 12A is embedded to a predetermined depth. The depth at which the connecting sheath 12B is embedded in the upper surface of the bottom slab concrete 12A is, for example, about half the plate thickness of the bottom slab concrete 12A.

  The connecting sheath tube 12B is made of steel and has an inner space that is open at least upward. The connecting sheath tube 12B is provided with a steel upper flange 12B1 at the upper end portion and a lower steel flange 12B2 at the lower end portion, and the upper and lower ends of the connecting sheath tube 12B are: Reinforced by the upper flange 12B1 and the lower flange 12B2. The upper flange 12B1 is provided with a through hole in the center portion that matches the inner space of the connecting sheath tube 12B. On the other hand, the lower flange 12B2 does not have a through hole.

  Further, both end portions of an outer peripheral wall body 12C, which is a steel material having an I-shaped cross section, are integrally attached to the outer peripheral surface of the connecting sheath tube 12B and the upper flange 12B1 and the lower flange 12B2 by welding. The upper flange 12B1 and the lower flange 12B2 of the connecting sheath tube 12B have not only a role of reinforcing the upper end portion and the lower end portion of the connecting sheath tube 12B but also a role of strengthening the connection with the outer peripheral wall body 12C. . Further, the lower flange 12B2 of the connecting sheath 12B also has a role of making it difficult for the connecting sheath 12B to be pulled out from the bottom concrete 12A.

  A leg 14A of the jacket 14 is inserted from above into the inner space of the connecting sheath 12B embedded in the upper surface of the bottom slab concrete 12A, and a grout material is inserted in the gap between the inner surface of the connecting sheath 12B and the leg 14A. Filled and integrated. Therefore, the connecting sheath tube 12 </ b> B has a role of connecting the jacket 14 to the caisson 12.

  A liner member 16 (see FIGS. 8 and 9) is attached to the lower surface of the leg bottom plate 14E at the lower end (vertical portion 14A1) of the leg 14A of the jacket 14, and the leg 14A is inserted into the inner space of the connecting sheath tube 12B. By adjusting the amount, the jacket 14 can be arranged at a predetermined height position in a predetermined posture.

  The material of the connecting sheath tube 12B and the upper flange 12B1 and the lower flange 12B2 may not be made of steel, and may be made of concrete, for example. The materials that can be used as the connecting sheath tube 12B and the upper flange 12B1 and the lower flange 12B2 are not particularly limited.

  Further, the lower portion of the connecting sheath tube 12B is closed by the disk-shaped lower flange 12B2, and the inner space of the connecting sheath tube 12B is not opened downward, but sufficiently supports the inserted leg 14A. If possible, an opening of a predetermined size that opens downward may be provided in the disk-like lower flange 12B2. For example, a drain opening may be provided in the disk-like lower flange 12B2 to prevent water from accumulating in the inner space of the connecting sheath 12B during storage after the jacket 14 is manufactured and before settling. .

  The outer peripheral wall 12C is a steel material having an I-shaped cross section, and as shown in FIGS. 3, 5 and 6, four outer peripheral wall bodies 12C are provided along the outer periphery of the bottom slab concrete 12A. The four outer peripheral wall bodies 12C are arranged so as to be substantially parallel to the four sides of the square-shaped bottom slab concrete 12A, respectively, and are embedded to a predetermined depth on the upper surface of the bottom slab concrete 12A (FIG. 6). reference). As described above, both end portions of the outer peripheral wall body 12C are integrally attached to the outer peripheral surface of the connecting sheath tube 12B and the upper flange 12B1 and the lower flange 12B2 by welding.

  The inner partition wall 12D is a steel material having an I-shaped cross section, and is integrally attached to the outer peripheral wall body 12C by welding. Similarly to the outer peripheral wall 12C, the inner partition 12D is embedded in the upper surface of the bottom slab concrete 12A to a predetermined depth (see FIG. 6). The inner partition wall 12D is arranged vertically and horizontally so that both ends thereof are connected to and connected to the four outer peripheral wall bodies 12C from the side. Therefore, the space surrounded by the upper surfaces of the four outer peripheral wall bodies 12C and the bottom slab concrete 12A is a large number of internal compartments 12E that are formed in a grid pattern by internal partition walls 12D arranged vertically and horizontally. .

  After the bottom slab concrete 12A is placed on the rubble mound 90, the filling material can be put into the internal section 12E formed in a grid pattern, increasing the weight of the caisson 12 and wearing it. The stability of the floor type foundation 10 can be improved. Thus, since the caisson 12 of the floor foundation 10 according to the first embodiment has the internal compartment 12E into which the filling material can be put after being placed on the rubble mound 90, it is laid down. The weight of the previous caisson 12 (the weight of the caisson 12 when performing installation work) can be reduced.

  Further, if there is no problem in terms of weight when lifting and moving in the caisson installation work, the bottom slab concrete 12A is thickened, and the top surface of the bottom slab concrete 12A is as high as the upper flange 12B1 of the connecting sheath 12B1. It may be a caisson that does not have the internal section 12E so as to be positioned. In this way, when the caisson is installed, it is not necessary to insert the filling material into the caisson, and the marine work that is greatly affected by sea conditions can be reduced.

  The material of the outer peripheral wall body 12C and the inner partition wall 12D may not be made of steel, for example, concrete. The material that can be used as the outer peripheral wall body 12C and the inner partition wall 12D is not particularly limited. 5 and 6 illustrate a case where a steel material having an I-shaped cross section is used for the outer peripheral wall body 12C and the inner partition wall 12D.

  In FIG. 4, the alternate long and short dash line indicated by reference numeral 12 </ b> D is an alternate long and short dash line indicating the center position of the internal partition wall 12 </ b> D in the wall thickness direction.

  FIG. 7 is a side view of the jacket 14 of the landing base 10 according to the first embodiment.

  The jacket 14 includes four legs 14 </ b> A, a brace 14 </ b> B, a reinforcing horizontal member 14 </ b> C, and a joint portion 14 </ b> D, and the weight of the upper structure (wind turbine body 62) installed above the jacket 14. In addition, external forces (wind load, earthquake load, etc.) applied to the upper structure (wind turbine body 62) are transmitted to the caisson 12 to stably support the upper structure.

  The leg 14A is a columnar steel pipe, and is a member that plays a central role when the jacket 14 plays the above-described role. The jacket 14 is provided with four legs 14A, and when viewed from above, the four legs 14A are inclined so as to spread in the diagonal direction of the square as going downward. The inclination angle of the leg 14A with respect to the vertical direction is not particularly limited as long as safety can be confirmed, but is set to about 20 ° in the first embodiment.

  The lower end portion of the leg 14A is a vertical portion 14A1, and the vertical direction of the vertical portion 14A1 is a substantially vertical direction. Four connecting sheath pipes 12B are arranged on the bottom slab concrete 12A in accordance with the positions of the vertical portions 14A1 of the four legs 14A, and the vertical portions 14A1 of the four legs 14A are included in the connecting sheath pipe 12B. It is inserted in each empty part. Therefore, the connecting portion between the leg 14A and the connecting sheath tube 12B has a double tube structure. The gap between the connecting sheath tube 12B and the vertical portion 14A1 of the leg 14A inserted into the connecting sheath tube 12B is filled with a grout material and integrated.

  As shown in FIG. 7, between adjacent legs 14A, braces 14B are arranged so as to cross diagonally, and the ends of the braces 14B are connected to the outer peripheral surface of the legs 14A. The brace 14B is a cylindrical steel pipe.

  Further, as shown in FIG. 7, a reinforcing horizontal member 14C is disposed in the horizontal direction between the adjacent legs 14A, and the end of the reinforcing horizontal member 14C is located on the outer peripheral surface of the leg 14A (more than the vertical portion 14A1). It is connected to the outer peripheral surface of a point slightly above. The reinforcing horizontal member 14C is a cylindrical steel pipe.

  The brace 14B and the reinforcing horizontal member 14C are reinforcing members provided in order for the jacket 14 to maintain a stable shape.

  In the jacket 14 of the floor type foundation 10 according to the first embodiment, columnar steel pipes are used for the legs 14A, the braces 14B, and the reinforcing horizontal members 14C, but they are used for the legs 14A, the braces 14B, and the reinforcing horizontal members 14C. The steel pipe that can be used is not limited to a cylindrical steel pipe, and a steel pipe having a polygonal cross-section can also be used.

  The joint portion 14 </ b> D is a portion provided at the upper end portion of the jacket 14, and is a portion for stably connecting the upper structure (the windmill main body portion 62) to the jacket 14.

  The joining portion 14D includes a connecting steel pipe 14D1, an upper flange 14D2, a lower flange 14D3, and a web 14D4.

  An upper flange 14D2 is attached to the upper end of the connecting steel pipe 14D1, and a lower flange 14D3 is attached to the lower end of the connecting steel pipe 14D1. The upper flange 14D2 of the connecting steel pipe 14D1 forms a flange joint (not shown) of the same standard at the lower end portion of the upper structure (the lower end portion of the wind turbine tower 64) and a flange joint using bolts. The windmill tower 64 is connected to the jacket 14.

  Further, the upper flange 14D2 and the lower flange 14D3 are also connected to the leg 14A, and the overturning moment applied to the upper structure (wind turbine main body 62) is converted into a couple of forces by the upper flange 14D2 and the lower flange 14D3 to the jacket 14. Communicated.

  Further, the outer periphery of the web 14D4 is attached to the outer peripheral surface of the connecting steel pipe 14D1, the lower surface of the upper flange 14D2, the upper surface of the lower flange 14D3, and the outer peripheral surface of the leg 14A, and the upper structure (wind turbine main body 62). The vertical force due to its own weight is converted to a shearing force by the web 14D4 and transmitted to the jacket 14.

  A steel plate having a shape corresponding to the outer shape of the horizontal section of the leg 14A is attached to the lower end portion of the vertical portion 14A1 of the leg 14A by welding to form a leg bottom plate 14E. A liner member 16 is attached to the lower surface of the leg bottom plate 14E as shown in FIG. 8 (enlarged vertical sectional view of the vertical portion 14A1 of the leg 14A). By attaching the liner member 16 having a desired thickness to the lower surface of the leg bottom plate 14E, the connecting length of the leg 14A and the amount of insertion into the pipe 12B can be adjusted. A reinforcing steel material (not shown) is arranged in a cross shape on the upper surface of the leg bottom plate 14E, and the leg bottom plate 14E is reinforced.

  FIG. 9 is an exploded vertical cross-sectional view of the liner member 16, but for convenience of illustration, the bolt 18 is not a vertical cross-section but a side surface viewed from the side.

  As shown in FIG. 9, the liner member 16 includes a base member 16A, a liner 16B, and a pressing member 16C.

  The base member 16A is a steel plate provided with a screw hole 16A1 in the thickness direction, and is attached to the lower surface of the leg bottom plate 14E by welding. However, the method of attaching the base member 16A to the lower surface of the leg bottom plate 14E is not limited to welding, and may be mechanically connected by bolts, for example.

  The liner 16B is a plurality of types of steel plates having different thicknesses, and through holes 16B1 are provided so as to correspond to the positions of the screw holes 16A1 of the base member 16A. By adjusting the thickness and the number of liners 16B attached below the leg bottom plate 14E, the total thickness of the liner member 16 attached to the lower surface of the leg bottom plate 14E can be adjusted. The amount of insertion into can be adjusted, and the installation posture and height position of the jacket 14 can be adjusted to an appropriate state.

  The shape of the liner 16B may be a flat plate shape, and the shape viewed from above may be a polygonal shape or a circular shape.

  Further, a slit may be used instead of the through hole 16B1 of the liner 16B. As a specific shape of the liner 16B, for example, a square liner 16D having a slit 16D1 (see FIG. 10) or a circular liner 16E having a slit 16E1 (see FIG. 11) may be used.

  By replacing the through holes 16B1 with the slits 16D1 and 16E1, the liners 16D and 16E can be inserted between the base member 16A and the pressing member 16C by loosening the bolts 18 without completely removing them. It becomes like this. For this reason, even if it is an underwater operation | work, workability | operativity improves by using the liner 16D which has the slit 16D1, or the liner 16E which has the slit 16E1.

  10 is a plan view of the liner 16D as seen from above, and FIG. 11 is a plan view of the liner 16E as seen from above. The bolts 18 for fixing the liners 16D and 16E are also drawn by dotted lines. . In FIGS. 10 and 11, the liners 16D and 16E are fixed by four bolts 18 respectively, but the number of bolts for fixing the liners 16D and 16E is not limited to four.

  The pressing member 16C is a steel plate that presses the liner 16B from below, and a through hole 16C1 that matches the shape of the bolt 18 is provided so as to correspond to the position of the screw hole 16A1 of the base member 16A.

  The liner 16B is disposed on the lower surface of the base member 16A so that the total thickness of the liner member 16 becomes a necessary thickness, and the lower surface of the liner 16B is pressed upward by the pressing member 16C. In this state, the liner 18B and the pressing member 16C can be attached to the base member 16A by inserting the bolts 18 through the through holes 16C1, 16B1, and 16A1 and screwing them into the screw holes 16A1 of the base member 16A.

  The outer shape of the horizontal cross section of the liner member 16 is the same shape as the outer shape of the horizontal cross section of the leg 14A or smaller than the outer shape of the horizontal cross section of the leg 14A.

(1-2) Effects of the grounding foundation according to the first embodiment As described in “(1-1) Configuration of the first embodiment”, the grounding foundation 10 according to the first embodiment of the present invention. Has a caisson 12 and a jacket 14, and the vertical portion 14 </ b> A <b> 1 of the leg 14 </ b> A of the jacket 14 is connected to the sheath 12 for connecting the caisson 12.

  Therefore, the caisson 12 and the jacket 14 can be transported as separate members to the point where the floor foundation 10 according to the first embodiment is installed, and the caisson 12 and the jacket 14 are installed as separate members. Can do.

  For this reason, since the caisson 12 and the jacket 14 can be lifted and installed separately at the time of installation work, the weight of the members for the foundation structure to be lifted can be reduced, and the lifting ability required for the working ship to be lifted can be reduced. Can be reduced. Also, if the weight of the object to be lifted and reduced is reduced, it becomes possible to use a SEP ship that has a small lifting capacity but can be used even when the sea conditions are severe. Construction is possible even on a certain day).

  Further, since the caisson 12 and the jacket 14 can be transported by separate transport ships during transport, the load on the transport ship can be reduced.

  Moreover, since the caisson 12 of the flooring foundation 10 according to the first embodiment has an internal section 12E into which the filling material can be put after being placed on the rubble mound 90, the caisson 12 before being laid down The weight (the weight of the caisson 12 when performing installation work) can be reduced.

  Further, if there is no problem in terms of weight when lifting and moving in the caisson installation work, the bottom slab concrete 12A is thickened, and the top surface of the bottom slab concrete 12A is as high as the upper flange 12B1 of the connecting sheath 12B1. It may be a caisson that does not have the internal section 12E so as to be positioned. In this way, when the caisson is installed, it is not necessary to insert the filling material into the caisson, and the marine work that is greatly affected by sea conditions can be reduced.

  In addition, when a grounded foundation is composed only of a gravity foundation, it is difficult to find an effective means other than increasing the weight of the gravity foundation in order to stabilize the foundation. Since the landing-type foundation 10 according to the first embodiment has a hybrid structure in which the jacket 14 is combined with the caisson 12 that is the gravity-type foundation, the design is more than the case where the landing-type foundation is configured only by the gravity-type foundation. The degree of freedom increases, and there are more options for measures to stabilize the foundation.

  In addition, since the caisson 12 is first installed at the point where the floor foundation 10 according to the first embodiment is installed, and then the jacket 14 is attached, even if the state of the rubble mound 90 on which the caisson 12 is installed is not so good. When the jacket 14 is attached to the caisson 12, the jacket 14 can be attached to the caisson 12 with a good installation posture of the jacket 14 by adjusting and attaching the jacket 14 so that the installation posture is good. Specifically, the connecting member of the caisson 12 and the height position and inclination of the tube 12B are measured, and the liner member 16 whose total thickness is adjusted based on the measurement result is used as the leg bottom plate of the leg 14A of the jacket 14. Attach to the lower surface of 14E in advance. Thereby, the amount of insertion of each leg 14A into the connecting sheath and the tube 12B can be adjusted, and the installation posture and height position of the jacket 14 can be adjusted to an appropriate state. By adjusting the amount of insertion (the amount of insertion of the vertical portion 14A1 into the connecting sheath and the tube 12B) for each leg 14A, the installation posture of the jacket 14 is improved (the upper flange 14D2 and the lower flange 14D3 of the joint portion 14D are horizontal). The jacket 14 can be attached to the caisson 12 so that the desired height position is obtained.

  Therefore, by using the floor foundation 10 according to the first embodiment, it is easy to install and install the floor foundation so as to have a desired installation posture and height position, and the level and height of the rubble mound can be adjusted. The management burden can be greatly reduced.

(1-3) Method for constructing a flooring foundation according to the first embodiment FIGS. 12 to 15 are side views schematically showing respective steps for installing the flooring foundation 10 according to the first embodiment of the present invention. FIG.

  First, the caisson 12 is transported to the sea area of the installation point, and the caisson 12 is set on the rubble mound 90 of the installation point as shown in FIG.

  The filling material 12F is put into the internal section 12E of the caisson 12 set on the rubble mound 90. FIG. 13 is a side view schematically showing a state after the filling material 12F has been introduced into the inner compartment 12E of the caisson 12. FIG.

  After inserting the filling material 12F into the inner section 12E of the caisson 12 set on the rubble mound 90, before installing the jacket 14, the connecting sheath of the caisson 12 and the height position and inclination of the pipe 12B are measured. Based on the measurement result, the liner member 16 is attached to the lower surface of the leg bottom plate 14E of the leg 14A of the jacket 14 as necessary, and the amount of insertion of the leg 14A into the connecting sheath 12B is adjusted. Make sure the installation posture and height position are appropriate.

  Instead of attaching the liner member 16 to the lower surface of the leg bottom plate 14E of the leg 14A, or attaching the liner member 16 to the lower surface of the leg bottom plate 14E of the leg 14A, the liner is attached to the lower part of the inner space of the connecting sheath 12B. A member may be arranged to adjust the amount of insertion of the leg 14A into the connecting sheath 12B. However, in order to place the liner member below the inner space of the connecting sheath 12B, Is required. When the liner member is not disposed under the inner space of the connecting sheath 12B and the liner member is disposed only on the lower surface of the leg bottom plate 14E of the leg 14A, underwater work can be reduced and workability is improved. To do.

  Next, as shown in FIG. 14, the jacket 14 is lowered while being lifted by a crane or the like so that the vertical portions 14A1 of the four legs 14A are inserted into the four connecting sheaths 12B of the caisson 12.

  After the jacket 14 is settled, a grout material is filled between the connecting sheath tube 12B and the vertical portion 14A1 of the leg 14A inserted into the connecting sheath tube 12B, and the connecting sheath tube 12B and the leg 14A are vertically aligned. The part 14A1 is integrated. When the integration of the connecting sheath tube 12B and the vertical portion 14A1 of the leg 14A is completed, the installation of the landing type foundation 10 is completed. FIG. 15 is a side view schematically showing a state in which the installation of the landing foundation 10 has been completed.

  In addition, the member used in order to hold | maintain the installation attitude | position and height position of the jacket 14 in an appropriate state is not necessarily limited to the liner member 16, and if safety can be confirmed, members other than the liner member 16 may be used. .

  In addition, after the installation of the jacket 14 to the caisson 12 is completed, the liner member 16 is installed in the inner space of the connecting sheath 12B, but the installation posture and height position of the jacket 14 are in an appropriate state. The member used for holding the connecting sheath may not be a member installed in the inner space of the connecting sheath 12B but may be a member installed outside the inner space of the connecting sheath 32A. A second embodiment to be described later is one example using such a member.

  Further, the integration of the connecting sheath tube 12B and the vertical portion 14A1 of the leg 14A may be performed by a method other than the filling of the grout material. But you can.

(1-4) Modified example of the floor foundation according to the first embodiment In the floor foundation 10 according to the first embodiment described above, the connecting sheath pipe 12B extends upward from the upper surface of the bottom slab concrete 12A. Although it protrudes, it is embedded in the upper surface of the bottom slab concrete 12A so as not to protrude below the lower surface, but the connecting sheath tube 12B does not protrude upward from the upper surface of the bottom slab concrete 12A, that is, the connecting sheath tube 12B. The upper end of the slab may be at the same height as the upper surface of the bottom slab concrete 12A or at a lower height than the upper surface of the bottom slab concrete 12A. Such an arrangement state is an arrangement state in which the connecting sheath tube 12B is arranged so as to fit between the upper surface and the lower surface of the bottom slab concrete 12A.

(2) Second Embodiment FIG. 16 is a front view of a floor foundation 20 according to a second embodiment of the present invention, FIG. 17 is an enlarged view of the XVII portion of FIG. 16, and FIG. FIG. 19 is a cross-sectional view taken along line XVIII-XVIII, and FIG. 19 is a cross-sectional view taken along line XIX-XIX in FIG. The same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  Adjustment of the installation posture and height position of the jacket 14 of the floor foundation 10 according to the first embodiment is performed by attaching the liner member 16 to the lower surface of the leg bottom plate 14E of the leg 14A. The floor type foundation 20 includes a jack mechanism 21 that adjusts the installation posture and height position of the jacket 14.

  The jack mechanism 21 includes a jack 22, a temporary receiving member 23, a temporary receiving member 24, and a liner member 25. As shown in FIG. 16, the reinforcing horizontal member 14C of the jacket 14 and the outer periphery of the caisson 12 are provided. It is arrange | positioned between the wall bodies 12C.

  The jack 22 is disposed between the temporary receiving member 23 provided on the reinforcing horizontal member 14C and the outer peripheral wall body 12C of the caisson 12. The jack 22 expands and contracts in the vertical direction so that the reinforcing horizontal member 14C and the outer peripheral wall body 12C The installation posture and height position of the jacket 14 are adjusted by adjusting the distance between the two.

  As shown in FIGS. 18 and 19, the temporary receiver 23 is attached to the lower portion of the reinforcing horizontal member 14C, receives the upward force from the jack 22, and applies the upward force from the jack 22 to the jacket. 14 to the reinforcing horizontal member 14C.

  The temporary receiver 23 includes a horizontal plate-like body 23A, a first vertical plate-like body 23B, and a second vertical plate-like body 23C. The upper surface of the horizontal plate-like body 23A and the outer periphery of the reinforcing horizontal member 14C. A first vertical plate-like body 23B and a second vertical plate-like body 23C are arranged between the surfaces. The orientation of the first vertical plate-like body 23B in the horizontal plane is a direction orthogonal to the reinforcing horizontal member 14C, and the orientation of the second vertical plate-like body 23C in the horizontal plane is a direction parallel to the reinforcing horizontal member 14C. The upward force received by the horizontal plate 23A from the jack 22 is transmitted to the reinforcing horizontal member 14C of the jacket 14 via the first vertical plate 23B and the second vertical plate 23C, and the installation posture of the jacket 14 And adjust the height position.

  The temporary receiving member 24 is formed by providing an upper flange 24B at the upper end of the steel pipe 24A and a lower flange 24C at the lower end. The upper flange 24B is provided with a through hole 24B1 corresponding to the position of the through hole 25A1 of the base member 25A. The temporary receiving member 24 is disposed between the temporary receiving member 23 provided on the reinforcing horizontal member 14C and the outer peripheral wall body 12C of the caisson 12, and is disposed so as to sandwich the jack 22 in the horizontal direction. . In a state before the jack 22 is extended and an upward force is applied to the reinforcing horizontal member 14 </ b> C of the jacket 14, the temporary support member 24 transmits the weight of the jacket 14 to the outer peripheral wall body 12 </ b> C of the caisson 12. Hold position. In this state, if the installation posture and height position of the jacket 14 are appropriate, the jack 22 can be omitted.

  In the second embodiment, as shown in FIGS. 16 and 17, the two temporary support members 24 are disposed so as to be sandwiched horizontally with respect to one jack 22, but the jacket 14 is safely supported. If it is possible, two provisional receiving members 24 need not be disposed so as to be sandwiched in the horizontal direction with respect to one jack 22, and either one so as to be adjacent to one jack 22 in the horizontal direction. Only one of them may be arranged.

  FIG. 20 is an exploded vertical cross-sectional view of the liner member 25 and related members, but for convenience of illustration, the bolt 26 and the nut 27 are not a vertical cross-section but a side view as viewed from the side.

  As shown in FIG. 20, the liner member 25 includes a base member 25 </ b> A and a liner 25 </ b> B, and is disposed between the horizontal plate-like body 23 </ b> A of the temporary receiver 23 and the upper flange 24 </ b> B of the temporary receiver 24. By adjusting the distance between the horizontal plate-like body 23A of the temporary receiver 23 and the upper flange 24B of the temporary receiver 24, the reinforcing horizontal member 14C of the jacket 14 and the outer peripheral wall body 12C of the caisson 12 are Adjust the distance between.

  The base member 25 </ b> A is a steel plate provided with a through hole 25 </ b> A <b> 1 in the thickness direction in accordance with the position of the through hole 23 </ b> A <b> 1 of the horizontal plate body 23 </ b> A of the temporary receiver 23, and the horizontal plate body 23 </ b> A of the temporary receiver 23. Are attached by bolts 26 and nuts 27 that pass through the through holes 23A1, 25A1, 25B1, and 24B1. However, the attachment method of the base member 25A to the lower surface of the horizontal plate-like body 23A is not limited to the mechanical attachment by the bolt 26 and the nut 27, and may be attached by, for example, welding.

  The liner 25B is a plurality of types of steel plates having different thicknesses, and the through holes 25B1 are provided so as to correspond to the positions of the through holes 25A1 of the base member 25A. By adjusting the thickness and the number of liners 25B, the total thickness of the liner member 25 can be adjusted, and the space between the horizontal plate-like body 23A of the temporary receiver 23 and the outer peripheral wall body 12C of the caisson 12 can be adjusted. The distance can be adjusted. Accordingly, the connecting sheath of the leg 14A and the amount of insertion into the pipe 12B can be adjusted, and the installation posture and height position of the jacket 14 can be adjusted to an appropriate state.

  The shape of the liner 25B may be a flat plate shape, and the shape viewed from above may be a polygonal shape or a circular shape.

  Further, a slit may be used instead of the through hole 25B1 of the liner 25B. As a specific shape of the liner 25B, for example, a square liner 25C having a slit 25C1 (see FIG. 21) or a circular liner 25D having a slit 25D1 (see FIG. 22) may be used.

  By replacing the through holes 25B1 with slits 25C1 and 25D1, the liners 25C and 25D can be loosened between the base member 25A and the upper flange 24B of the temporary support member 24 by loosening the bolts 26 without completely removing them. Can be plugged into. For this reason, even if it is underwater work, workability improves by using liner 25C which has slit 25C1, or liner 25D which has slit 25D1.

  21 is a plan view of the liner 25C viewed from below, and FIG. 22 is a plan view of the liner 25D viewed from below. The bolts 26 for fixing the liners 25C and 25D are also drawn by dotted lines. . In FIGS. 21 and 22, the liners 25C and 25D are each fixed by four bolts 26, but the number of bolts fixing the liners 25C and 25D is not limited to four.

  When adjusting the amount of insertion of the leg 14A into the sheath 12B using the jack mechanism 21, the horizontal plate-like body 23A of the temporary receiver 23 and the outer peripheral wall body 12C of the caisson 12 are first used using the jack 22. The liner 25B is inserted between the base member 25A and the upper flange 24B of the temporary support member 24 in this state. Then, the upper flange 24B, the liner 25B, the base member 25A, and the horizontal plate-like body 23A of the temporary receiver 23 are fixed by a bolt 26 and a nut 27 that are inserted through the through holes 23A1, 25A1, 25B1, and 24B1. . Thereafter, the jack 22 may be removed.

  When the jack 22 is removed and the construction of the floor foundation is completed, leaving the temporary support member 24 causes a problem in the member strength (particularly fatigue) of the jacket 14 and the caisson 12. For this reason, it is desirable to remove the provisional receiving member 24 as well. The provisional receiving member 24 is removed after the integration of the vertical portion 14A1 of the leg 14A of the jacket 14 and the sheath sheath 12B of the caisson 12 is completed.

  Since the floor type foundation 20 according to the second embodiment includes the jack mechanism 21, even after the jacket 14 is disposed on the caisson 12, by using the jack mechanism 21, the installation posture and height of the jacket 14 can be increased. The position can be adjusted.

(3) Third Embodiment (3-1) Configuration of Third Embodiment FIG. 23 is a front view of an offshore wind turbine 80 for wind power generation to which a landing-type foundation 30 according to a third embodiment of the present invention is applied. FIG. 24 is an enlarged front view showing a part of the landing-type foundation 30 of the offshore wind turbine 80, and FIG. 25 is a sectional view taken along line XXV-XXV in FIG.

  The caissons 12 of the landing foundations 10 and 20 according to the first and second embodiments are gravity foundations. However, in the landing foundation 30 according to the third embodiment, suction is performed instead of the gravity foundations. The point using the foundation is a major structural difference between the landing foundations 10 and 20 according to the first and second embodiments of the landing foundation 30 according to the third embodiment.

  The offshore wind turbine 80 for wind power generation includes a floor foundation 30 and a wind turbine body 62, and the wind turbine body 62 is supported by the floor foundation 30. The windmill main body 62 includes a windmill tower 64, a hub 66, and a blade 68.

  The floor foundation 30 according to the third embodiment of the present invention includes a suction foundation 32 installed on a water bottom 92 and a jacket 14 supported by the suction foundation 32. The suction foundation 32 is a foundation that stabilizes the installation position by pressure due to suction in addition to its own weight and the weight of the ballast, and stably supports the wind turbine body 62 that is the upper structure.

  FIG. 26 is a side view of the suction foundation 32 of the landing foundation 30 according to the third embodiment.

  As shown in FIGS. 24 to 26, the suction foundation 32 has a cylindrical shape as a whole, and a shape viewed from above is a circle. As shown in FIGS. 24 to 26, the floor foundation 30 has four suction foundations 32, and when viewed from above, the four suction foundations 32 are respectively arranged on the vertices of a substantially square shape. Each of the four suction foundations 32 is integrally provided with one connecting sheath tube 32A on the upper surface thereof, and the floor foundation 30 is provided with a total of four connecting sheath tubes 32A. When viewed from above, the four connecting sheath tubes 32A are respectively arranged on the vertices of a substantially square shape.

  The material of the suction foundation 32 is not particularly limited, and may be made of steel or concrete, for example.

  Since the shape, material, and function of the connecting sheath tube 32A are the same as those of the connecting sheath tube 12B of the flooring foundation 10 according to the first embodiment, the description thereof is omitted.

  FIG. 27 is a side view of the jacket 14 of the landing-type foundation 30 according to the third embodiment. Since the jacket 14 and the liner member 16 used in the flooring foundation 30 according to the third embodiment are the same as the jacket 14 and the liner member 16 used in the flooring foundation 10 according to the first embodiment, each component member In addition, the same reference numerals are given to the respective portions, and description thereof is omitted.

(3-2) Effect of the grounding foundation according to the third embodiment The flooring foundation 30 according to the third embodiment of the present invention includes the suction foundation 32 and the jacket 14, and the suction foundation. The vertical portion 14A1 of the leg 14A of the jacket 14 is inserted and connected to a connecting sheath tube 32A that is integrally attached to 32.

  Therefore, the suction foundation 32 and the jacket 14 can be transported as separate members to the point where the floor foundation 30 according to the third embodiment is installed, and the suction foundation 32 and the jacket 14 are separated as members. Can be installed.

  For this reason, since the suction foundation 32 and the jacket 14 can be separately lifted and installed at the time of installation work, the weight of the members for the foundation structure to be lifted can be reduced, and the lifting capacity required for the lifting work ship Can be reduced. Also, if the weight of the object to be lifted and reduced is reduced, it becomes possible to use a SEP ship that has a small lifting capacity but can be used even when the sea conditions are severe. Construction is possible even on a certain day).

  Further, since the suction foundation 32 and the jacket 14 can be transported by separate transport ships during transport, the load on the transport ship can be reduced.

  In addition, since the suction foundation 32 is first installed at the point where the landing foundation 30 according to the third embodiment is installed, and then the jacket 14 is attached, the installation posture and height position of the suction foundation 32 installed on the bottom 92. Even if it is slightly deviated from the installation posture and height position expected by design, when the jacket 14 is attached to the suction foundation 32, the jacket 14 is adjusted and attached so that the installation posture of the jacket 14 is good. The jacket 14 can be attached to the suction foundation 32 with a good installation posture. Specifically, by measuring the height position and the inclination of the connecting sheath 32A attached to the suction foundation 32 and integrated, the liner member 16 whose total thickness is adjusted based on the measurement result, Attached to the lower surface of the leg bottom plate 14E of the leg 14A of the jacket 14 in advance. Thereby, the amount of insertion of each leg 14A into the connecting sheath and the tube 12B can be adjusted, and the installation posture and height position of the jacket 14 can be adjusted to an appropriate state. By adjusting the amount of insertion (the amount of insertion of the vertical portion 14A1 into the connecting sheath and the tube 12B) for each leg 14A, the installation posture of the jacket 14 is improved (the upper flange 14D2 and the lower flange 14D3 of the joint portion 14D are horizontal). The jacket 14 can be attached to the suction foundation 32 so that the desired height position is obtained.

  Therefore, by using the floor foundation 30 according to the third embodiment, it is easy to install and install the floor foundation so as to have a desired installation posture and height position. The management burden can be greatly reduced.

(3-3) Method for constructing a grounding foundation according to the third embodiment FIGS. 28 to 31 are side views schematically showing respective steps of installing the flooring foundation 30 according to the third embodiment of the present invention. FIG.

  First, the suction foundation 32 is transported to the sea area of the installation point, and as shown in FIG. 28, the suction foundation 32 is settling in the water area of the installation point, and as shown in FIG. 29, the suction foundation 32 is installed on the bottom 92 of the installation point. To do.

  After installing the suction foundation 32 on the bottom 92 of the installation point, before installing the jacket 14, measure the connecting sheath of the suction foundation 32 and the height position and inclination of the pipe 32 </ b> A, and based on the measurement results, if necessary Then, the liner member 16 is attached to the lower surface of the leg bottom plate 14E of the leg 14A of the jacket 14, and the connecting position of the leg 14A and the amount of insertion into the pipe 32A are adjusted, so that the installation posture and the height position of the jacket 14 are properly adjusted. To be.

  Instead of attaching the liner member 16 to the lower surface of the leg bottom plate 14E of the leg 14A, or attaching the liner member 16 to the lower surface of the leg bottom plate 14E of the leg 14A, the liner is attached to the lower part of the inner space of the coupling sheath 32A. A member may be arranged to adjust the amount of insertion of the leg 14A into the connecting sheath and the pipe 32A. However, in order to place a liner member below the inner space of the connecting sheath 32A, the underwater work Is required. When a liner member is not disposed under the inner space of the connecting sheath 32A but only on the lower surface of the leg bottom plate 14E of the leg 14A, underwater work can be reduced and workability is improved. To do.

  Next, as shown in FIG. 30, the jacket 14 is lowered while being lifted by a crane or the like so that the vertical portions 14A1 of the four legs 14A are inserted into the four coupling sheaths 32A of the suction foundation 32.

  After completion of settling of the jacket 14, a grout material is filled between the connecting sheath tube 32A and the vertical portion 14A1 of the leg 14A inserted into the connecting sheath tube 32A, and the connecting sheath tube 32A and the leg 14A are vertically The part 14A1 is integrated. When the integration of the connecting sheath tube 32A and the vertical portion 14A1 of the leg 14A is completed, the installation of the landing-type foundation 30 is completed. FIG. 31 is a side view schematically showing a state where the installation of the landing base 30 is completed.

  In addition, the member used in order to hold | maintain the installation attitude | position and height position of the jacket 14 in an appropriate state is not necessarily limited to the liner member 16, and if safety can be confirmed, members other than the liner member 16 may be used. .

  Further, after the installation of the jacket 14 to the suction foundation 32 is completed, the liner member 16 is installed in the inner space of the connecting sheath 32A, but the installation posture and height position of the jacket 14 are appropriately set. The member used for maintaining the state may not be a member installed in the inner space of the connecting sheath 32A, but may be a member installed outside the inner space of the connecting sheath 32A. The second embodiment described above is one example in which such a member is used.

  Further, the integration between the connecting sheath 32A and the vertical portion 14A1 of the leg 14A may be performed by a method other than the filling of the grout material. But you can.

(3-4) Modification of the grounding foundation according to the third embodiment The flooring foundation 30 according to the third embodiment described above includes four suction foundations 32 and includes four suction foundations. 32 is integrally provided with one connecting sheath tube 32A on its upper surface, and the floor foundation 30 is provided with four connecting sheath tubes 32A in total. One connecting sheath tube 32A may be integrally provided.

(4) Number of connecting sheath pipes The flooring foundation 10 according to the first and second embodiments includes four connecting sheath pipes 12B, and the flooring foundation 30 according to the third embodiment is also used for four connections. Although the sheath pipe 32A is provided, the number of the sheath sheath pipes provided in the floor foundation according to the present invention is not limited to four, and an arbitrary number can be selected within a range in which safety can be secured. It is.

10, 20, 30 ... grounding foundation 12 ... caisson (gravity foundation)
12A ... bottom slab concrete 12B, 32A ... connecting sheath 12B1 ... upper flange 12B2 ... lower flange 12C ... outer peripheral wall 12D ... inner partition 12E ... inner compartment 12F ... filling material 14 ... jacket 14A ... leg 14A1 ... vertical part 14B ... Brace 14C ... Reinforced horizontal member 14D ... Joint 14D1 ... Steel pipe for connection 14D2 ... Upper flange 14D3 ... Lower flange 14D4 ... Web 14E ... Leg bottom plate 16, 25 ... Liner member 16A, 25A ... Base member 16A1 ... Screw hole 16B, 16D, 16E, 25B, 25C, 25D ... Liner 16B1, 16C1, 23A1, 24B1, 25A1, 25B1 ... Through hole 16C ... Holding member 16D1, 16E1, 25C1, 25D1 ... Slit 18, 26 ... Bolt 21 ... Jacking mechanism 22 ... Jack DESCRIPTION OF SYMBOLS 23 ... Temporary receiving 23A ... Horizontal plate-like body 23B ... 1st vertical plate-like body 23C ... 2nd vertical plate-like body 24 ... Temporary receiving member 24A ... Steel pipe 24B ... Upper flange 24C ... Lower flange 27 ... Nut 32 ... Suction foundation 60, 80 ... Offshore windmill 62 ... Windmill main body 64 ... Windmill tower 66 ... Hub 68 ... Blade 90 ... Rubble mound 92 ... Bottom of water

Claims (23)

A gravity foundation placed on a rubble mound,
A jacket attached to the gravity foundation;
An imbedded foundation comprising:
The gravitational foundation is integrally provided with a connecting sheath tube having an inner space that is open at least at the top,
The jacket has a leg extending downwardly;
The leg is inserted into the connecting sheath tube, and the leg inserted into the connecting sheath tube is integrated with the connecting sheath tube into which the leg is inserted. Floor foundation.   The gravitational foundation includes a plurality of the connecting sheath pipes having at least an inner space that is open at the top, and the jacket includes a plurality of the legs, and each of the plurality of legs. The leg and the connecting sheath tube are arranged so that each one of the plurality of connecting sheath tubes corresponds to a position, and each of the plurality of legs corresponds to the corresponding connecting sheath tube. Each of the foundations according to claim 1, wherein the foundations are inserted.   The flooring foundation according to claim 1 or 2, wherein the connecting sheath pipe is provided with flanges at an upper end portion and a lower end portion. The gravity foundation includes bottom slab concrete forming a bottom surface,
The said connection sheath pipe | tube has a site | part which protruded upwards rather than the upper surface of the said bottom slab concrete, but does not have a site | part protruded below rather than the lower surface. Implantable foundation. The gravity foundation includes bottom slab concrete forming a bottom surface,
The flooring foundation according to any one of claims 1 to 3, wherein the connecting sheath pipe is disposed so as to be accommodated between an upper surface and a lower surface of the bottom slab concrete. The gravity foundation includes a bottom slab concrete forming a bottom surface, and an outer peripheral wall body provided on the top surface of the bottom slab concrete so as to follow the outer periphery of the bottom slab concrete,
The flooring foundation according to any one of claims 1 to 5, wherein the space surrounded by the outer peripheral wall body and the bottom slab concrete can hold the filled padding material. The gravity foundation includes an outer peripheral wall body provided on the upper surface of the bottom slab concrete so as to follow the outer periphery of the bottom slab concrete, and an end portion in the longitudinal direction of the outer peripheral wall body is connected to an outer peripheral surface of the connecting sheath pipe. Consolidated
The landing type according to claim 4, wherein the outer peripheral wall body, the outer peripheral surface of the connecting sheath pipe, and the space surrounded by the bottom slab concrete can hold the filled padding material. Basic. Suction foundation installed at the bottom of the water,
A jacket attached to the suction foundation;
An imbedded foundation comprising:
The suction foundation is integrally provided with a connecting sheath pipe having an inner space at least opened upward,
The jacket has a leg extending downwardly;
The leg is inserted into the connecting sheath tube, and the leg inserted into the connecting sheath tube is integrated with the connecting sheath tube into which the leg is inserted. Floor foundation.   The suction foundation includes a plurality of the connecting sheath pipes having at least an inner space that is open at the top, and the jacket includes a plurality of the legs, and each position of the plurality of legs. The leg and the connecting sheath tube are arranged so that each one of the plurality of connecting sheath tubes corresponds to the connecting sheath tube, and each of the plurality of legs corresponds to the corresponding connecting sheath tube, respectively. 9. The grounded foundation according to claim 8, wherein the foundation is inserted. Multiple suction foundations installed at the bottom of the water,
A jacket attached to the plurality of suction foundations;
An imbedded foundation comprising:
The plurality of suction foundations are each integrally provided with a connecting sheath tube having an inner space that is open at least at the top,
The jacket has a plurality of legs extending downward;
The leg and the suction foundation and the connecting sheath tube are arranged so that one of the connecting sheath tubes corresponds to each position of the plurality of legs.
Each of the plurality of legs is inserted into the corresponding connecting sheath tube, and the leg inserted into the connecting sheath tube is integrated with the connecting sheath tube into which the leg is inserted. A grounded foundation characterized by   The grounding foundation according to any one of claims 1 to 10, wherein a grout material is filled in a gap between the connecting sheath pipe and the leg inserted into the connecting sheath pipe. .   The liner member for adjusting the position of the jacket is disposed between the lower surface of the inner hollow portion of the connecting sheath and the leg. Implantable foundation as described in. A foundation installation step of sinking a gravitational foundation integrally provided with a connecting sheath having an inner space at least at an upper portion on a rubble mound;
A step of inserting a leg of the jacket into the connecting sheath of the gravity foundation submerged on the rubble mound in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
With
In the inserting step, the leg is inserted into the connecting sheath tube so that the jacket is arranged at a predetermined height in a predetermined posture. A foundation installation step of sunk a gravitational foundation integrally provided with a plurality of connecting sheaths having an inner space that is open at least on the rubble mound;
A step of inserting each of the plurality of legs of the jacket into the corresponding sheathing pipe of the gravitational foundation set on the rubble mound in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
With
In the inserting step, each of the plurality of legs is inserted into the corresponding connecting sheath tube so that the jacket is disposed at a predetermined height in a predetermined posture. How to build. A foundation installation step of installing a suction foundation integrally provided with a connecting sheath pipe having an inner space at least upwardly open on the bottom of the water;
A step of inserting a leg of the jacket into the connecting sheath pipe of the suction foundation installed on the water bottom in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
With
In the inserting step, the leg is inserted into the connecting sheath tube so that the jacket is arranged at a predetermined height in a predetermined posture. A foundation installation step of installing a suction foundation provided with a plurality of integrally connecting sheath pipes having an inner space at which the upper part is open at the bottom of the water;
A step of inserting each of the plurality of legs of the jacket into the corresponding connecting sheath pipe of the suction foundation installed on the water bottom in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
With
In the inserting step, each of the plurality of legs is inserted into the corresponding connecting sheath tube so that the jacket is disposed at a predetermined height in a predetermined posture. How to build. A foundation installation step of installing a plurality of suction foundations, each integrally including a connecting sheath pipe having an inner space that is open at the top, on the bottom of the water;
A step of inserting each of the plurality of legs of the jacket into the corresponding connecting sheath pipe of the plurality of suction foundations installed on the water bottom in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
With
In the inserting step, each of the plurality of legs is inserted into the corresponding connecting sheath tube so that the jacket is disposed at a predetermined height in a predetermined posture. How to build. A foundation installation step of sinking a gravitational foundation integrally provided with a connecting sheath having an inner space at least at an upper portion on a rubble mound;
A measuring step of measuring the height position and inclination of the connecting sheath of the gravity foundation set on the rubble mound in the foundation setting step;
A liner member that installs a liner member on one or both of the lower end of the leg of the jacket and the lower surface of the inner space portion of the connecting sheath based on the result measured in the measuring step. Installation process;
The step of inserting the leg of the jacket into the connecting sheath of the gravitational foundation set on the rubble mound in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
A method for constructing a grounded foundation characterized by comprising: A foundation installation step of sunk a gravitational foundation integrally provided with a plurality of connecting sheaths having an inner space that is open at least on the rubble mound;
A measuring step of measuring the height positions and inclinations of the plurality of connecting sheaths of the gravity foundation set on the rubble mound in the foundation setting step;
Based on the result measured in the measuring step, if necessary, a liner member is provided on one or both of the lower end of the leg of the jacket having a plurality of legs and the lower surface of the inner space portion of the connecting sheath. Liner member installation process to install,
A step of inserting each of the plurality of legs of the jacket into the corresponding connecting sheath tube of the gravity foundation submerged on the rubble mound in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
A method for constructing a grounded foundation characterized by comprising: A foundation installation step of installing a suction foundation, which is integrally provided with a connecting sheath pipe having an inner space at least open upward, on the bottom of the water;
A measuring step for measuring the height position and inclination of the connecting sheath of the suction foundation installed on the water bottom in the foundation installation step;
A liner member that installs a liner member on one or both of the lower end of the leg of the jacket and the lower surface of the inner space portion of the connecting sheath based on the result measured in the measuring step. Installation process;
The insertion step of inserting the leg of the jacket into the connecting sheath pipe of the suction foundation installed on the bottom of the water in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
A method for constructing a grounded foundation characterized by comprising: A foundation installation step of installing a suction foundation provided with a plurality of integrally connecting sheath pipes having an inner space at which the upper part is open at the bottom of the water;
A measuring step of measuring the height positions and inclinations of the plurality of connection sheaths of the suction foundation installed on the water bottom in the foundation installation step;
Based on the result measured in the measuring step, if necessary, a liner member is provided on one or both of the lower end of the leg of the jacket having a plurality of legs and the lower surface of the inner space portion of the connecting sheath. Liner member installation process to install,
A step of inserting each of the plurality of legs of the jacket into the corresponding connecting sheath pipes of the suction foundation installed on the water bottom in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
A method for constructing a grounded foundation characterized by comprising: A foundation installation step of installing a plurality of suction foundations integrally provided with a connecting sheath pipe having an inner space that is open at least at the top, on the bottom of the water,
A measuring step for measuring a height position and an inclination of each of the connecting sheaths of the plurality of suction foundations installed on the water bottom in the foundation installation step;
Based on the result measured in the measuring step, if necessary, a liner member is provided on one or both of the lower end of the leg of the jacket having a plurality of legs and the lower surface of the inner space portion of the connecting sheath. Liner member installation process to install,
A step of inserting each of the plurality of legs of the jacket into the corresponding connecting sheath pipes of the suction foundation installed on the water bottom in the foundation installation step;
An integration step of integrating the leg inserted into the connecting sheath tube in the insertion step with the connecting sheath tube into which the leg is inserted;
A method for constructing a grounded foundation characterized by comprising:   23. The wearing according to claim 13, wherein a grout material is filled in a gap between the connecting sheath and the leg inserted into the connecting sheath in the integration step. How to build a floor foundation.

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