JP2016215937A - Self-elevation type work bench device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elevate a position of a platform from sea surface.SOLUTION: A self-elevation type work bench ship 1 comprises: plural elevation pillars 3 which are so positioned in a horizontal direction as to be separated from one another; a platform 2 which is so provided as to connect the plural elevation pillars 3 to one another and to be capable of being elevated with respect to each of the plural elevation pillars 3; a first fixation part 7 which fixes the platform 2 with respect to the elevation pillars 3; a floating body structure 4 which is placed under the platform 2, has a buoyant force which can lift the platform 2, and is so provided as to connect the plural elevation pillars 3 to one another and to be capable of being elevated with respect to each of the plural elevation pillars 3; and a second fixation part 8 which fixes the floating body structure 4 with respect to the elevation pillars 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a self-elevating work table apparatus.

  Examples of the self-lifting workbench device include a self-lifting workbench ship. The self-lifting work platform ship is mainly used for construction of offshore facilities. The self-lifting work platform ship includes a platform and lifting legs that support the platform. The platform is placed at a height where the waves do not reach on the sea surface, and is used as a working scaffold in the construction of offshore structures.

  Patent Document 1 describes a self-lifting work platform ship. This self-elevating worktable ship has a support leg reinforcing member disposed below the mainframe body. The supporting leg reinforcing member has a hollow box-shaped member, and the supporting leg reinforcing member is disposed at a desired depth by pouring seawater into the box-shaped member.

JP 2013-123936 A

  In recent years, offshore structures having a high height from the sea surface such as wind power generation facilities have been constructed. When constructing such an offshore structure, it is necessary to arrange a working machine such as a crane at a high place. Here, the self-elevating work table apparatus has a structure in which a plurality of elevating legs support the weight of a platform or the like for placing a crane or the like. If it does so, since the length of the raising / lowering leg will be restrict | limited from a viewpoint of preventing buckling generation | occurrence | production of the raising / lowering leg, the height of the platform from the sea surface will also be restricted.

  Therefore, the present invention provides a self-elevating work table apparatus that can increase the position of the platform from the sea surface.

  A self-elevating workbench device according to an embodiment of the present invention is configured to connect a plurality of lifting legs and a plurality of lifting legs that are spaced apart from each other in the horizontal direction and to each of the plurality of lifting legs. A platform provided movably up and down with respect to the platform, a first fixing portion for fixing the platform with respect to the lifting / lowering pedestal, and a buoyancy that is disposed on the lower side of the platform so that the platform can be lifted. A floating structure part that connects the pillars to each other and is movable up and down with respect to each of the plurality of lifting legs, and a second fixing part that fixes the floating structure to the lifting legs.

  In this self-elevating work table apparatus, the floating structure part is fixed to the elevating leg column by the second fixing part below the platform on which the work machine such as a crane is placed. Accordingly, since the plurality of lifting legs are connected to each other by the floating structure, deformation in the horizontal direction is suppressed at the portion where the floating structure of the lifting legs is fixed. According to this structure, the buckling length of the lifting / lowering pedestal includes the section from the lower end of the lifting / lowering pedestal to the portion where the floating structure is fixed, and the portion where the floating structure is fixed to the portion where the platform is fixed. And become the section. Then, it becomes possible to extend the length of each section to a length that can prevent the occurrence of buckling. Therefore, since the overall height from the lower end to the position where the platform is fixed increases in the lifting column, the position of the platform from the sea level can be increased.

  The floating structure part may have a work surface part that forms a work area below the platform. According to this floating structure part, the work area which can be used for construction of an offshore structure is expanded. Therefore, the workability of the offshore structure can be improved.

  A self-elevating workbench apparatus according to an aspect of the present invention is disposed between a platform and a floating structure, and connects a plurality of elevating leg columns to each other and is movable up and down with respect to each of the elevating leg columns. You may further provide the provided intermediate | middle connection part and the 3rd fixing | fixed part which fixes an intermediate | middle connection part with respect to a raising / lowering leg pillar. According to this structure, the plurality of lifting legs are connected to each other by the floating structure part, the intermediate connection part, and the platform. Then, the buckling length of the lifting / lowering pedestal includes the section from the lower end of the lifting / lowering pedestal to the part where the floating structure is fixed, and the section from the part where the floating structure is fixed to the part where the intermediate coupling is fixed And a section from a portion where the intermediate connecting portion is fixed to a portion where the platform is fixed. Then, it becomes possible to extend the length of each section to a length that can prevent the occurrence of buckling. Therefore, in the elevating leg column, the overall height from the lower end to the position where the platform is fixed is further increased, so that the position of the platform from the sea level can be further increased.

A self-elevating workbench device according to an embodiment of the present invention is disposed below a floating structure, and is provided to connect a plurality of elevating leg columns to each other and to be movable up and down with respect to each of the plurality of elevating leg columns. You may further provide the underwater connection part and the 4th fixing | fixed part which fixes an underwater connection part with respect to a raising / lowering pedestal.
According to this structure, the section from the lower end of the lifting / lowering pedestal to the portion where the floating structure is fixed is divided into two sections. Therefore, since the length of each section can be extended to a length that can prevent the occurrence of buckling, the self-elevating work table apparatus can be used for construction of an offshore structure at a deep water location.

  According to the self-elevating work table apparatus of the present invention, the position of the platform from the sea surface can be increased.

It is a figure which shows the self-lifting type work platform ship which concerns on one form of this invention. It is a figure which shows operation | movement of the self-raising type work platform ship shown by FIG. It is a figure which shows the operation | movement of the continuation of the self-raising type work platform ship shown in FIG. It is a figure which shows the operation | movement of the continuation of the self-raising type work platform ship shown by FIG. It is a figure which shows the operation | movement of the continuation of the self-raising type work platform ship shown in FIG. It is a figure which shows the self-raising type work platform ship which concerns on a modification. It is a figure which shows the floating body structure part of the self-raising type work platform ship which concerns on a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, a self-elevating work platform ship (self-elevating work platform apparatus) 1 is used for construction of an offshore structure 100 having a high height from the sea surface SL, such as a wind power generation facility. For example, the offshore wind power generation facility is installed in a sea area where the water depth L1 is about 20 m, and the height from the sea surface SL is about 90 m. The self-elevating work platform ship 1 provides a work area for placing the crane C at a desired height L2 from the sea surface SL.

  The self-elevating work platform ship 1 includes a platform 2, a plurality of elevating legs 3, a floating structure (floating structure) 4, and an intermediate connecting portion 6.

  The platform 2 provides a substantially horizontal work area in which the crane C and the like are arranged. The work area is a space where a construction machine such as a crane C necessary for the construction of the offshore structure 100 is arranged or construction materials are temporarily placed. For example, the platform 2 is disposed at a height L2 of about 90 m from the sea surface SL. The platform 2 is a box-like structure, and has a strength capable of supporting construction machines and construction materials in the vertical direction. A through hole through which the elevating leg 3 is inserted is provided at the corner of the platform 2. The through hole has an inner diameter slightly larger than the diameter of the elevating leg column 3. Therefore, the platform 2 can be moved up and down with respect to the lifting and lowering pillar 3.

  The self-elevating work platform ship 1 has four elevating pedestal pillars 3 that are spaced apart from each other in the horizontal direction. Each lifting / lowering leg 3 is inserted through the through-hole of the platform 2 so as to extend along the normal direction (vertical direction) of the platform 2. The elevating leg column 3 is a cylindrical column member, and supports the platform 2 and the construction machines and construction materials placed on the platform 2. The lower end 3b of the elevating / lowering pillar 3 is embedded in the seabed SB. The platform 2 is disposed in the vicinity of the upper end 3 a of the lifting leg 3. The height L3 from the lower end 3b to the upper end 3a of the elevating / lowering pillar 3 is, for example, about 120 m.

  The platform 2 is fixed to the elevating / lowering pillar 3 by a first fixing portion 7. That is, the first fixing portion 7 fixes the position of the platform 2 along the vertical direction with respect to the lifting / lowering leg 3. Moreover, the 1st fixing | fixed part 7 can also cancel | release the fixed state with the raising / lowering leg pillar 3 as needed. The 1st fixing | fixed part 7 should just be able to implement | achieve the state fixed with respect to the raising / lowering pedestal pillar 3, and the state from which the fixing state was cancelled | released, and can use a well-known specific structure. For example, a structure in which a steel plate that is shorter than the outer periphery of the lifting / lowering leg column 3 is wound around the lifting / lowering leg column 3 and both ends of the steel plate are fastened by bolts.

  In addition, a lifting device 11 is attached to the platform 2. A known device can be adopted as the lifting device 11, for example, a rack and pinion type device.

  A floating structure 4 is disposed below the platform 2. The floating structure 4 is disposed at a height that can suppress the effects of waves. The floating structure 4 is a box-like structure like the platform 2. The floating structure 4 has a through hole through which the elevating leg 3 is inserted and a work surface plate (work surface portion) 4a. The through hole has an inner diameter slightly larger than the diameter of the elevating leg column 3. Therefore, the floating structure 4 can be moved up and down with respect to the lifting leg 3. Further, the work surface plate 4a is used as a space for temporarily placing machines and materials used for the construction of the offshore structure 100. The floating structure 4 generates the buoyancy that the self-elevating work platform ship 1 has. This buoyancy has a size capable of levitating the entire self-lifting work platform ship 1. In the self-elevating work platform ship 1, the work area is provided by the platform 2, and the floating structure 4 provides a buoyancy and a function as a joint material for fixing the elevating leg pillars 3 to each other in the horizontal direction.

  The floating structure 4 is fixed to the elevating leg 3 by the second fixing portion 8. In other words, the second fixing portion 8 fixes the position of the floating structure 4 along the vertical direction with respect to the elevating leg 3. A structure similar to that of the first fixing portion 7 can be adopted for the second fixing portion 8.

  An intermediate connecting portion 6 is disposed between the platform 2 and the floating structure 4. The intermediate connecting portion 6 is disposed at a position that substantially bisects the platform 2 and the floating structure 4. The intermediate connecting portion 6 is a plate-like structure that connects the elevating leg columns 3 and has a through hole through which the elevating leg column 3 is inserted and a work surface plate 6a. Since the plate-like intermediate connecting portion 6 has high rigidity, the connecting strength of the four elevating leg columns 3 can be increased.

  The intermediate connecting portion 6 is fixed to the elevating leg column 3 by the third fixing portion 9. In other words, the third fixing portion 9 fixes the position of the intermediate connecting portion 6 along the vertical direction with respect to the lifting / lowering leg 3. The third fixing portion 9 can employ the same structure as that of the first fixing portion 7.

  A brace 12 is attached between the platform 2 and the intermediate connecting portion 6. A brace 12 is also attached between the intermediate connecting portion 6 and the floating structure 4. According to these braces 12, it is possible to increase the proof strength of the self-lifting work platform ship 1 against external forces such as waves, tidal currents or wind, and buckling.

  Then, the installation method of the self-raising type work platform ship 1 will be described.

  As shown in part (a) of FIG. 2, the self-elevating work platform ship 1 is moved to a desired location. At this time, in the self-lifting work platform ship 1, the platform 2, the intermediate connecting portion 6, and the floating structure 4 are close to each other in the height direction. The platform 2, the intermediate connecting portion 6, and the floating structure 4 are disposed in the vicinity of the lower end 3 b of the elevating leg column 3. If it does so, the lower end 3b of the raising / lowering leg 3 will not be settled on the seabed SB, but will be located in the sea surface SL vicinity. Accordingly, the self-elevating work platform ship 1 is in a state of floating due to the buoyancy of the floating structure 4. Therefore, the self-elevating work platform ship 1 is moved to the place by towing the tug boat B or the like.

  As shown in part (b) of FIG. 2, the self-elevating work platform ship 1 moved to a desired position operates the elevating device 11 to move the platform 2 upward relative to the elevating pedestal 3. Move. At this time, the platform 2, the intermediate connecting portion 6, and the floating structure 4 remain floating on the sea surface SL, whereas the lifting / lowering pillar 3 moves toward the seabed SB. The elevating device 11 is operated until the lower end 3b of the elevating pedestal 3 reaches the seabed SB.

  As shown in part (a) of FIG. 3, the self-elevating work platform ship 1 further adds the elevating leg column 3 to the upper end of the elevating leg column 3. The elevating leg 3 may be one that adds a plurality of columnar members in the vertical direction. In this way, by adopting a structure in which the lifting / lowering pedestal 3 can be added, the position of the center of gravity during towing (see the part (a) in FIG. 2) is lowered, so that the self-elevating work platform ship 1 can be moved stably. Can be made.

  As shown in part (b) of FIG. 3, the lifting device 11 is operated to move the platform 2 relative to the lifting leg 3 upward. At this stage, since the lower end 3b of the lifting / lowering pillar 3 is bottomed on the seabed SB, when the lifting / lowering device 11 is operated, the platform 2 moves vertically upward. At this time, the intermediate connecting portion 6 is connected to the platform 2, and the floating structure 4 is connected to the intermediate connecting portion 6. Therefore, as the platform 2 rises, the intermediate connecting portion 6 and the floating structure 4 also rise simultaneously.

  When the floating structure 4 reaches the height L4 (for example, 10 m) from the predetermined sea surface SL, the operation of the lifting device 11 is stopped once. The lifting device 11 continues to maintain a position along the height direction when the operation is stopped. Subsequently, the floating structure 4 is fixed to the elevating leg column 3 using the second fixing portion 8. Then, the floating structure 4 is separated from the intermediate connecting portion 6.

  As shown in part (a) of FIG. 4, the lifting device 11 is operated again to move the platform 2 relative to the lifting leg 3 upward. At this stage, the intermediate connecting portion 6 is connected to the platform 2, but the floating structure 4 is not connected to the intermediate connecting portion 6. Therefore, as the platform 2 rises, the intermediate connecting portion 6 rises simultaneously.

  At this time, in the section Z1 between the position where the lifting device 11 holds the lifting leg 3 in the lifting leg 3 and the lower end 3b of the lifting leg 3, the floating structure 4 connects the lifting leg 3 to each other. ing. Then, the buckling length of the lifting / lowering pedestal 3 includes a section Z2 from the lower end 3b to the position where the floating structure 4 is fixed, and a section from the position where the floating structure 4 is fixed to the position where the lifting device 11 holds. It becomes Z3. Therefore, since the buckling length is shortened, the platform 2 and the intermediate coupling portion 6 can be raised in a stable state.

  When the intermediate connecting part 6 reaches the height L5 (for example, 50 m) from the predetermined sea surface SL, the operation of the lifting device 11 is stopped once. Subsequently, the intermediate connecting portion 6 is fixed to the lifting leg 3 using the third fixing portion 9. Then, the intermediate connecting portion 6 is separated from the platform 2.

  As shown in part (b) of FIG. 4, the lifting device 11 is operated again to move the platform 2 relative to the lifting leg 3 upward. At this stage, only the platform 2 rises. At this time, in the section Z1 between the lower end 3b of the lifting / lowering leg column 3 and the position at which the lifting / lowering device 11 holds the lifting / lowering leg column 3 in the lifting / lowering leg column 3, the floating structure 4 connects the lifting / lowering leg columns 3 to each other. The intermediate connecting part 6 connects the elevating leg 3 with each other. Then, the buckling length of the elevating pedestal column 3 is from the position Z2 from the lower end 3b to the position where the floating structure 4 is fixed, and from the position where the floating structure 4 is fixed to the position where the intermediate connecting portion 6 is fixed. And the section Z4 from the position where the intermediate connecting portion 6 is fixed to the position held by the lifting device 11. Therefore, since the buckling length is shortened in each of the sections Z2, Z3, and Z4, the platform 2 can be raised in a stable state. When the platform 2 reaches a height L2 (for example, 90 m) from a predetermined sea level SL, the operation of the lifting device 11 is stopped. Subsequently, the platform 2 is fixed to the elevating leg column 3 using the first fixing portion 7.

  As shown in part (a) of FIG. 5, the brace 12 is bridged between the floating structure 4 and the intermediate coupling part 6. Further, the brace 12 is bridged between the intermediate connecting portion 6 and the platform 2. And as shown in (b) of Drawing 5, crane C is operated and construction of offshore structure 100 is performed.

  The self-elevating work platform ship 1 is installed through the above steps. In short, the self-elevating work platform 1 is installed by moving the elevating pedestal 3 downward relative to the platform 2 and the floating structure 4 so that the lower end 3b of the elevating pedestal 3 is moved to the seabed SB. After the floating body structure 4 is arranged at the first height L4 by moving the floating body structure 4 together with the platform 2 to the bottom, the floating body structure 4 using the second fixing portion 8 is used. The first fixing portion 7 is used after the platform 2 is arranged at the second height L2 higher than the first height by moving the platform 2 upward by fixing the platform 2 to the lifting / lowering pedestal 3. And fixing the platform 2 to the lifting leg 3.

  The operation and effect of the above-described self-elevating work platform ship 1 will be described. In this self-elevating work platform ship 1, the floating structure 4 is fixed to the elevating leg column 3 by the second fixing portion 8 below the platform 2 on which the work machine such as the crane C is placed. Therefore, since the plurality of elevating leg columns 3 are connected to each other by the floating structure 4, deformation in the horizontal direction is suppressed in the portion of the elevating leg column 3 to which the floating structure 4 is fixed. An intermediate connecting portion 6 disposed between the platform 2 and the floating structure 4 to connect the plurality of lifting legs 3 to each other and to be movable up and down with respect to each of the plurality of lifting legs 3; And a third fixing part 9 for fixing the intermediate connecting part 6 to the elevating leg 3. According to this structure, the buckling length of the lifting / lowering pedestal 3 is such that the interval Z2 from the lower end 3b to the position where the floating structure 4 is fixed, and the intermediate connecting portion 6 is fixed from the position where the floating structure 4 is fixed. The section Z3 up to the position where it is set and the section Z4 from the position where the intermediate connecting portion 6 is fixed to the position held by the elevating device 11 are obtained. Then, it becomes possible to extend the length of each section Z2, Z3, Z4 to a length that can prevent the occurrence of buckling. Therefore, since the overall height from the lower end 3b to the position where the platform 2 is fixed increases in the elevating leg 3, the position of the platform 2 from the sea surface SL can be increased.

  The floating structure 4 may have a work surface plate 4 a that forms a work area on the lower side of the platform 2. According to the floating structure 4, the work area that can be used for the construction of the offshore structure 100 is expanded. Therefore, the workability of the offshore structure 100 can be improved.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, as shown in FIG. 6, the self-elevating work platform ship 1 </ b> A is disposed on the lower side of the floating structure 4, and connects the plurality of elevating leg columns 3 to each other and connects each of the elevating leg columns 3. You may further provide with the underwater connection part 13 provided so that raising / lowering was possible, and the 4th fixing | fixed part 14 which fixes the underwater connection part 13 with respect to the raising / lowering leg pillar 3. FIG. The underwater connecting portion 13 is different from the intermediate connecting portion 6 in that it does not have the work face plate 6a and is located in the sea. Therefore. The underwater connecting portion 13 has a frame shape that connects the elevating leg columns 3 to each other. According to this shape, the influence of the ocean current that acts on the underwater connection portion 13 is suppressed, and an increase in external force applied to the elevating leg 3 is suppressed.

  Moreover, according to this structure, the section Z6 from the lower end 3b of the elevating leg 3 to the portion where the floating structure 4 is fixed is divided into two sections Z7 and Z8. Therefore, since the length of each section Z7, Z8 can be extended to the length which can prevent buckling, self-lifting work platform ship 1A can be used for construction of offshore structure 100 in the deep place of water depth L9. .

  Moreover, as shown in FIG. 7, the self-elevating work platform ship is a flat plate having a square intermediate connection portion (see FIG. 7A), and the number of elevating leg columns is four. There is no limit. Depending on the environment in which the self-elevating work platform ship is used, the intermediate connecting portion may have various shapes and numbers, and a desired number of lifting legs. For example, as shown in part (b), the intermediate connecting part 6A may have a frame shape. As shown in part (c), the intermediate connecting part 6B has a rectangular shape and may have a through-hole H through which eight lifting legs are inserted. The intermediate connecting portion 6C may be a triangular flat plate (see (d) portion) or a disc shape.

  Further, the floating structure is not limited to the box-shaped floating structure 4. For example, the floating body structure unit includes a work table unit that connects a plurality of lifting legs to form a work area, and a float that is attached to the work table unit and has a buoyancy that can float the platform 2. Also good. In this case, it is the float that generates the buoyancy, and the work table does not have to have the necessary buoyancy.

DESCRIPTION OF SYMBOLS 1,1A ... Self elevating work platform ship (self elevating work platform apparatus), 2 ... Platform, 3 ... Elevating pedestal, 3a ... Upper end, 3b ... Lower end, 4 ... Floating structure (floating structure part), 6, 6A, 6B, 6C ... intermediate connection part, 6a ... work face plate, 7 ... first fixing part, 8 ... second fixing part, 9 ... third fixing part, 11 ... lifting device, 12 ... brace, 13 ... Underwater connecting part, 14 ... fourth fixing part, 100 ... marine structure, C ... crane, SB ... seabed, SL ... sea surface.

Claims (4)

A plurality of elevating pedestals that are spaced apart from each other in the horizontal direction;
A platform provided to connect the plurality of lifting legs to each other and to be movable up and down with respect to each of the plurality of lifting legs;
A first fixing portion for fixing the platform to the lifting leg;
A floating body disposed under the platform, having a buoyancy capable of floating the platform, and connecting the plurality of lifting legs to each other and being movable up and down with respect to each of the plurality of lifting legs. A structure part;
A self-elevating work table apparatus, comprising: a second fixing unit that fixes the floating body structure unit to the elevating pedestal.   The self-lifting workbench device according to claim 1, wherein the floating structure part has a work surface part that forms a work area on the lower side of the platform. An intermediate connecting portion that is disposed between the platform and the floating structure portion and connects the plurality of lifting legs to each other and is movable up and down with respect to each of the plurality of lifting legs;
A third fixing part for fixing the intermediate connecting part to the lifting leg;
The self-lifting workbench device according to claim 1 or 2, further comprising: An underwater connecting portion that is disposed below the floating structure portion and connects the plurality of lifting legs to each other and is movable up and down with respect to each of the plurality of lifting legs;
A fourth fixing part for fixing the underwater connection part to the lifting leg;
The self-elevating work table apparatus according to any one of claims 1 to 3, further comprising:

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