JP2021046721A - Assembly jig of steel derrick, and assembly method of steel derrick - Google Patents

Abstract

To provide an assembly jig and an assembly method useful for an efficient assembly work of a steel derrick.SOLUTION: An assembly jig of a steel derrick in one aspect of this invention comprises: a support tower built in a center of an assembly area of a steel derrick having at least three legs; at least three support arms radially extending from an upper part of the support tower; and at least three leg support portions which are respectively provided at a tip of the at least three support arms and which respectively support the at least three legs in a built state in the assembly area.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to a jig for assembling a steel turret and a method for assembling a steel turret.

Patent Document 1 describes a steel frame of a tower boiler building, characterized in that a plurality of steel frame blocks are stacked and connected in the vertical direction, and at least a part between the plurality of steel frame blocks is connected via a connecting steel frame column. The method of assembling the main pillar (steel turret) is disclosed. Each steel block contains four columns and beams and braces connecting the columns. A long leg is formed by connecting the corresponding columns between the steel blocks by connecting the steel columns.

Japanese Unexamined Patent Publication No. 2013-19110

In the assembly of steel turrets, it is necessary to fix the legs that can be erected on the ground to each other with high accuracy. In order to realize this, it is conceivable to fix the legs to each other with the legs lying sideways and positioned on the ground, and to raise the legs fixed to each other together. In this method, a large lifting machine is required to lift a unit in which a plurality of members are assembled together. Further, as disclosed in Patent Document 1 described above, it is also conceivable to divide the steel turret into multi-stage units, assemble each unit, and then stack the units. Also in this method, a large lifting machine is required to lift the unit in which a plurality of members are assembled. Further, when stacking the units, it is necessary to join the standing legs (divided legs) to each other, which complicates the work. The present disclosure provides assembling jigs and assembling methods useful for efficient assembling work of steel turrets.

The steel turret assembly jig according to one aspect of the present disclosure includes a support tower erected in the center of the steel turret assembly area having at least three legs, and at least three supports radiating from the top of the support tower. It comprises an arm and at least three leg supports, each provided at the tip of at least three support arms and each supporting at least three legs in an upright position in the assembly area. With this assembly jig, the assembly work can be performed with the legs arranged according to the completed shape of the steel turret. That is, after the leg is erected, the parts can be assembled to the leg. As a result, the frequency of use of the large lifting machine can be reduced. Therefore, it is useful for efficient assembly work.

The support tower may have an elevating aisle that allows the operator to elevate and elevate to at least three support arms. Each of the at least three support arms may have a moving aisle that allows the operator to move from the support tower to the leg support. In this case, the assembly jig used for assembling the steel turret can also be used as a scaffold for aerial work. Therefore, it is more useful for efficient assembly work.

The steel turret may further have a reinforcing member that connects adjacent legs of at least three legs to each other. The height position of the leg support portion may be set in the vicinity of the portion where the reinforcing member is connected to the leg. In this case, the assembly jig can also be used as a scaffold for connecting the reinforcing members. Therefore, it is useful for simplifying the equipment for assembling steel turrets.

The reinforcing member may include a plurality of stages of braces arranged so as to be arranged in the vertical direction between the legs adjacent to each other and connecting the legs. The height position of the leg support may be set in the vicinity between the brace of a plurality of stages. In this case, the assembly jig can also be used for joining the brace in a plurality of stages. Therefore, it is more useful for efficient assembly work.

The support tower may have at least three height adjusters that vary in height position of the leg supports. In this case, the leg support portion can be arranged at a height corresponding to the height of the steel turret or the like, and an assembly jig can be used for assembling a plurality of types of steel turrets.

The support tower may further include a tower lower part that stands on the ground in the assembly area and a tower upper part to which at least three support arms are connected. The height adjusting portion is between the tower intermediate portion interposed between the tower upper portion and the tower lower portion, the connecting portion that detachably connects the tower upper portion and the tower intermediate portion, and the tower intermediate portion and the tower lower portion. May include a connecting portion for detachably connecting the above. In this case, the height position of the leg support portion can be adjusted by exchanging the middle portion of the tower according to the steel turret, so that a complicated mechanism for adjusting the height becomes unnecessary. Therefore, it is useful for simplifying the assembly jig.

Each of the three support arms may have a length adjuster that varies the length from the support tower to the leg support. In this case, the leg support portion can be arranged at a position corresponding to the inclination of the leg of the steel turret, and the assembly jig can be used for assembling a plurality of types of steel turrets.

A method of assembling a steel turret according to another aspect of the present disclosure includes a support tower, at least three support arms radially extending from the top of the support tower, and at least three at the tips of at least three support arms. At least three legs are leaned against at least three leg supports of the assembly jig including the leg support, and at least three legs lean against each of the three leg supports are adjacent to each other. This includes connecting the legs with reinforcing members. In this assembly method, the assembly work can be performed with the legs arranged according to the completed shape of the steel turret. That is, after the leg is erected, the reinforcing member can be assembled to the leg. As a result, the frequency of use of the large lifting machine can be reduced. Therefore, it is useful for efficient assembly work.

Leaning the leg against the leg support may include arranging the installation jig at a position where the leg stands, and arranging the leg on the installation jig and leaning the leg against the leg support. In this case, the positioning work of the leg 20 and the leaning work of the leg 20 can be performed separately. Therefore, it is easy to lean the leg against the assembly jig.

The reinforcing member may include a first brace that connects adjacent legs to each other. Connecting the legs adjacent to each other with a reinforcing member means ascending to the support arm via the elevating passage of the support tower, moving from the support tower to the leg support portion via the movement passage of the support arm, and the leg. It may include joining the upper end of the first brace to the leg at the support. In this case, since the assembly jig can be used as a scaffold in the joining work of the upper end portion of the first brace, it is useful for simplifying the assembly equipment.

In the leg support, joining the upper end of the first brace to the leg may include joining the upper end of the first brace to the leg in the first working scaffold installed on the leg support. .. In this case, by using the first scaffold, the joining work between the upper end portion of the first brace and the leg becomes easy. Therefore, it is more useful for efficient assembly work.

The reinforcing member may further include a second brace that is arranged above the first brace between adjacent legs and connects the legs to each other. Connecting the adjacent legs with a reinforcing member may include joining the lower end of the second brace to the leg at the leg support. In this case, the assembly jig can also be used as a scaffold for the joining work between the upper end portion of the first brace and the lower end portion of the second brace and the leg. Therefore, it is more useful for efficient assembly work.

The method of assembling the steel turret may further include placing the upper block on top of at least three legs and joining the upper ends of each of the at least three legs to the upper block. Joining the upper end of each of the at least three legs to the upper block may include joining the upper end of the leg to the upper block in a second working scaffold installed on the upper block. In this case, since the aerial work platform extending to the upper block 40 is unnecessary, it is more useful for efficient assembly work.

Connecting the adjacent legs with a reinforcing member means joining at least a part of the reinforcing member to the leg except for the upper end portion before the placement of the upper block, and after the placement of the upper block, the reinforcing member of the reinforcing member. It may include joining the upper end to the leg. In this case, by using the second scaffolding for joining the upper blocks, it is possible to perform the joining work with respect to the upper end portion of the reinforcing member. Further, since the upper end portion of the reinforcing member is not connected to the leg before the arrangement of the upper block, the positioning of the upper block and each leg is easy. Therefore, it is more useful for efficient assembly work.

Joining the top of each of the at least three legs to the top block means installing a connecting bridge between the top block and the work turret located next to the area where at least three legs are erected. , Moving from the work turret through the connecting bridge to the upper block may further be included. In this case, it is possible to move to the upper block via the work turret and the connecting bridge and work on the upper block. Therefore, even if the upper block is located at a high place, it can be easily moved to the upper block, which is useful for efficient assembly work.

According to the present disclosure, an assembling jig and an assembling method useful for efficient assembling work of a steel turret are provided.

FIG. 1 is a perspective view showing an example of a steel turret. FIG. 2 is a perspective view showing an example of an assembly jig. FIG. 3 is a side view showing an example of the support arm. FIG. 4 is a flowchart showing an example of the assembly procedure. FIG. 5 is a diagram showing a state of leg preparation. FIG. 6 is a diagram showing an example of the arrangement of the support members. FIG. 7 is a diagram showing an example of how the leg is leaning. FIG. 8 is a diagram for explaining the joining of the braces. FIG. 9 is a diagram for explaining the joining of the upper blocks. FIG. 10 is a diagram showing an example of a scaffold installed on the upper block.

Hereinafter, one embodiment will be described with reference to the drawings. In the description, the same elements or elements having the same function are designated by the same reference numerals, and duplicate description will be omitted.

[Steel turret]
First, with reference to FIG. 1, a support device used in an offshore wind power generation facility will be described as an example of a steel turret to be assembled. Offshore wind power generation equipment is equipment that uses the powerful wind power generated in the ocean to generate electricity. The support device 1 (steel turret) shown in FIG. 1 is a base that supports a power generation device including a propeller or the like that rotates by receiving a wind force at a predetermined height offshore. The support device 1 has, for example, a jacket-type basic structure. The support device 1 may have a height of about several tens of meters. The height of the support device 1 is, for example, about 30 to 80 m. The material constituting the support device 1 includes at least steel (steel). The steel (steel) contained in the material constituting the support device 1 may contain at least iron and carbon, and may be any steel such as cast iron, carbon steel, alloy steel, and special steel. The support device 1 includes, for example, a lower jacket 10 and an upper block 40.

The lower jacket 10 includes at least three legs 20 and a reinforcing member 30. As an example, the lower jacket 10 includes four legs 20. The leg 20 is a steel support column for supporting a member (power generation device) to be supported. The four legs 20 are erected on the ground so as to surround the vertical central axis CL. For example, the ground contact positions of the four legs 20 are set so as to be evenly spaced from each other in the circumferential direction around the central axis CL. As a result, the polygon connecting the grounding positions of the four legs 20 is a substantially square. Each of the four legs 20 is tilted toward the central axis CL, for example, as it goes upward. That is, the distance between the legs 20 adjacent to each other becomes narrower toward the upper side.

The leg 20 includes a main body 22 and a support member 24 (stubing). The main body 22 is a long member that constitutes the main part of the leg 20. For example, the main body 22 is a tubular member extending in one direction, and the shape of the cross section intersecting the extending direction of the main body 22 may be a circle or an ellipse. The main body 22 may have a thickness (diameter) sufficient for workers to come and go to work. As an example, the main body 22 has a thickness of about 1 m to several m. The main body 22 has a length of, for example, about several tens of meters. The main body 22 may be formed by connecting a plurality of long members to each other. For example, the main body 22 is formed by welding the ends of two long members (hereinafter, referred to as “divided legs 26a, 26b”) to each other. The main body 22 may include a tubular connecting member for connecting the ends of the split legs 26a and 26b, and the connecting member and each end may be welded to each other.

The support member 24 is a member that supports the main body 22. The support member 24 constitutes the lower end of the leg 20. For example, the length of the support member 24 is shorter than that of the main body portion 22, and the support member 24 is erected substantially perpendicular to the ground. The support member 24 may be a pipe (cylindrical member). The main body 22 is fixed to the upper end of the support member 24 by, for example, bolting or welding.

The reinforcing member 30 is a steel member that connects the legs 20 adjacent to each other. As shown in FIG. 1, when the lower jacket 10 includes four legs 20, the lower jacket 10 includes four reinforcing members 30 between the legs 20 respectively. The reinforcing member 30 may include a plurality of stages of braces arranged at different height positions between the legs 20 adjacent to each other. The brace has, for example, two solid pillars or pipes that intersect each other, and the two pillars or pipes are connected to each other at the intersections. In this case, the brace has two upper ends and two lower ends. The two upper ends of the brace are connected to leg 20s adjacent to each other, and the two lower ends of the brace are connected to leg 20s adjacent to each other. The upper end and the lower end of the brace may be connected to the leg 20 via a joint member, respectively. The reinforcing member 30 has, for example, a two-stage brace as a multi-stage brace. Hereinafter, the brace located in the lower stage is referred to as a lower brace 34 (first brace), and the brace located in the upper stage is referred to as an upper brace 36 (second brace).

The lower end 34b of the lower brace 34 may be connected to the lower end (near the lower end) of the main body 22 of the leg 20. The upper end portion 36a of the upper brace 36 may be connected to the upper end portion (the portion near the upper end) of the main body portion 22. The upper end portion 34a of the lower brace 34 and the lower end portion 36b of the upper brace 36 are connected to the intermediate portion of the main body portion 22, respectively. The upper end portion 34a and the lower end portion 36b may be close to each other so that the connection work to the leg 20 can be performed on the same work scaffold. For example, the height positions of the upper end portion 34a and the lower end portion 36b may be substantially coincident with each other, or may be separated from each other to such an extent that the connection work to the leg 20 can be performed on the same work scaffold. Since the distance between the legs 20 adjacent to each other becomes narrower toward the upper side, the width of the upper brace 36 is set to be smaller than the width of the lower brace 34. Each brace may be composed of at least one brace (a pillar or pipe connected to the leg 20 at different height positions at both ends), or may be composed of three or more brace. The reinforcing member 30 may have three or more steps of braces, and in addition to the plurality of steps of braces, both ends may have beams connected to the legs 20 at the same height position. ..

The upper block 40 is a block on which a power generation device is mounted and is supported by a leg 20. The upper block 40 includes, for example, at least three connecting portions 42 and a connecting portion 44. The upper block 40 includes the same number of connection portions 42 as the number of legs 20. As shown in FIG. 1, the four connecting portions 42 are provided so as to correspond to the upper ends of the four legs 20 respectively. The connecting portion 42 may be a pipe having the same thickness as the leg 20. The connecting portion 44 is arranged on the central axis CL, and a power generation device is connected to the connecting portion 44. For example, the power generation device is mounted on the upper block 40 with the lower end of the tower for supporting the propeller and the nacelle of the power generation device mounted on the connection portion 44.

[Assembly jig]
Subsequently, an example of the assembly jig will be described with reference to FIGS. 2 and 3. The assembly jig 50 shown in FIG. 2 is a jig (framework) for assembling the support device 1. Specifically, the assembly jig 50 is a jig for assembling the lower jacket 10 composed of the leg 20 and the reinforcing member 30. The assembly jig 50 includes, for example, a support tower 60, an installation portion 52, at least three support arms 80, and at least three leg support portions 90.

The support tower 60 is erected vertically on the ground. The height of the support tower 60 is set according to the support device 1 to be assembled. As an example, the height of the support tower 60 is set to about half the height of the support device 1.

The installation portion 52 is a member that keeps the support tower 60 in an upright state, and is provided at the lower end portion of the support tower 60. The installation portion 52 includes, for example, a plurality of installation arms 54 (for example, four installation arms 54) that extend radially from the outer wall of the lower end portion of the support tower 60 and come into contact with the ground. Each installation arm 54 resists the fall of the support tower 60 in its extending direction. The plurality of installation arms 54 may be arranged so as to be evenly spaced from each other in the circumferential direction centered on the support tower 60.

At least three support arms 80 are provided on top of the support tower 60. The assembly jig 50 is provided with the same number of support arms 80 as the number of legs 20. The four support arms 80 shown in FIG. 2 are arms for supporting each of the four legs 20. The four support arms 80 extend radially from the top of the support tower 60. For example, the four support arms 80 extend radially from the outer wall of the upper end (near the upper end) of the support tower 60. In this case, the height positions of the four support arms 80 are defined by the height of the support tower 60. The four support arms 80 are arranged so as to be evenly spaced from each other in the circumferential direction centered on the support tower 60, for example.

A leg support portion 90 is provided at the tip of each support arm 80. The leg support 90 supports the leg 20 standing on the ground (maintains the leg 20 in an upright position). The leg support portion 90 is provided on the support arm 80 and projects from the tip of the support arm 80. For example, the leg support portion 90 is provided on the upper surface near the tip of the support arm 80. A recess 90a for receiving the leg 20 may be formed at the tip of the leg support portion 90 (a portion protruding from the tip of the support arm 80). By accommodating the leg 20 in the recessed portion 90a, the movement of the leg 20 supported by the leg supporting portion 90 in the circumferential direction is restricted. In the example shown in FIG. 2, four support arms 80 are arranged between the installation arms 54 adjacent to each other when viewed from above. In this case, interference between the leg 20 standing on the ground and the installation arm 54 can be easily avoided.

As shown in FIG. 2, the support tower 60 may have a height adjusting portion 66, a tower upper portion 62, and a tower lower portion 64. In the state where the support tower 60 is erected, the lower part 64 of the tower, the height adjusting portion 66, and the upper part 62 of the tower are arranged in this order from the ground. The installation arm 54 provided at the lower end of the support tower 60 is provided at the lower end of the lower portion 64 of the tower. The support arm 80 provided at the upper end of the support tower 60 is provided at the upper end of the tower upper portion 62.

The height adjusting portion 66 is a member that changes the height of the support tower 60 (the height position of the leg supporting portion 90). The height adjusting portion 66 includes, for example, a tower intermediate portion 68, a connecting portion 72, and a connecting portion 74. The tower middle portion 68 is interposed between the tower lower portion 64 and the tower upper portion 62. The connecting portion 72 detachably connects the upper portion 62 of the tower and the intermediate portion 68 of the tower. The connecting portion 74 detachably connects the middle portion 68 of the tower and the lower portion 64 of the tower. Since the connecting portions 72 and 74 are detachable, the tower intermediate portions 68 can be replaced by preparing two or more types of tower intermediate portions 68 having different heights in advance. As a result, the height position of the leg support portion 90 is adjusted. The height adjusting portion 66 may include a tower intermediate portion 68 whose length can be expanded and contracted, and the height position of the leg supporting portion 90 may be adjusted by expanding and contracting the tower intermediate portion 68 itself.

The height of the support tower 60 may be set so that the leg support portion 90 is located in the vicinity of the portion where the reinforcing member 30 is connected to the leg 20. The height of the support tower 60 is set so that the leg support portion 90 is located in the vicinity between the plurality of brace included in the reinforcing member 30, for example. As an example, the height of the support tower 60 is set so that the leg support portion 90 is located in the vicinity between the lower brace 34 and the upper brace 36 (hereinafter, referred to as “near the brace”) (FIG. FIG. 8). The height of the support tower 60 is set so that the leg support portion 90 is located closer to the upper end portion 34a than the lower end portion 34b of the lower brace 34. That is, the difference in height position between the upper end portion 34a and the leg support portion 90 is smaller than the difference in height position between the leg support portion 90 and the lower end portion 34b. For example, the leg support portion 90 is provided with the upper end portion 34a to such an extent that the operator can connect the upper end portion 34a of the lower brace 34 and the lower end portion 36b of the upper brace 36 to the leg 20 in the leg support portion 90. It is located closer to the upper end 34a with the lower end 34b.

The support arm 80 may have a length adjusting portion 84 that changes the length from the support tower 60 to the leg support portion 90 (hereinafter, referred to as “arm length”). FIG. 3 shows an example of the support arm 80 viewed from above. Each support arm 80 has a first arm 80a, a second arm 80b, and a length adjusting portion 84. The first arm 80a is fixed to the upper end of the support tower 60. The second arm 80b is connected to the first arm 80a via a length adjusting portion 84, and one end thereof is fixed to the leg supporting portion 90.

The length adjusting unit 84 is a member that makes the arm length variable. The length adjusting portion 84 includes, for example, an arm intermediate portion 86, a connecting portion 88a, and a connecting portion 88b. The arm intermediate portion 86 is interposed between the first arm 80a and the second arm 80b. The connecting portion 88a detachably connects the first arm 80a and the arm intermediate portion 86. The connecting portion 88b detachably connects the arm intermediate portion 86 and the second arm 80b. Since the connecting portions 88a and 88b are detachable, the arm intermediate portions 86 can be replaced by preparing two or more types of arm intermediate portions 86 having different lengths in advance. This adjusts the arm length. The length adjusting portion 84 may include an arm intermediate portion 86 whose length can be expanded and contracted, and the arm length may be adjusted by expanding and contracting the arm intermediate portion 86 itself.

Returning to FIG. 2, the support tower 60 may further include an elevating passage 76. The elevating passage 76 allows the operator to elevate and descend to the upper end of the tower upper portion 62. The elevating passage 76 may be provided outside the support tower 60 (along the outer surface). When the support tower 60 is formed in a tubular shape, the elevating passage 76 may be provided inside the support tower 60. The elevating passage 76 is provided inside each of the tower lower part 64, the tower middle part 68, and the tower upper part 62, for example. The elevating passage 76 may include the elevating equipment 76a. Examples of the elevating equipment 76a include spiral stairs or elevators provided inside the tower. At the lower part of the support tower 60 (for example, the lower part 64 of the tower), an entrance 76b for a worker to enter may be provided inside the tower.

The support arm 80 may have a moving passage 82. The support arm 80 has an upper surface on which an operator can walk, for example, as a moving passage 82. The moving passage 82 is connected to the elevating passage 76, and the operator uses the elevating passage 76 to move to the upper end (support arm 80) of the support tower 60 and uses the moving passage 82. It can move from the support tower 60 to the leg support 90. The moving passage 82 may include moving equipment. The moving passage 82 includes, for example, handrails provided at the left and right ends on the upper surface of the support arm 80 as moving equipment.

[Assembly procedure]
Subsequently, an example of the assembly procedure (assembly method) of the support device 1 using the assembly jig 50 will be described with reference to FIGS. 4 to 10. A part of the assembly work of the support device 1 is performed in the assembly area AR set on the ground (see FIG. 6). FIG. 4 is a flowchart showing an example of the assembly procedure.

As shown in FIG. 4, the operator first executes step S01. In step S01, for example, the operator prepares the lower brace 34 and the upper brace 36 of the reinforcing member 30, and prepares the main body 22 of the leg 20. The operator may perform the preparatory work with the member to be prepared placed on the ground G. For example, as shown in FIG. 5, the operator forms the main body 22 by connecting the divided legs with the divided legs 26a and 26b lying sideways on the ground G. When each of the split legs 26a and 26b is a pipe, the operator joins the ends of the split legs 26a and 26b to each other. At this time, the operator may weld the connecting portions on the outer side and the inner side of the divided leg in order to maintain the strength of the leg 20 (main body portion 22). In the welding work inside the split leg, the worker goes inside the split leg to perform the work.

Next, the worker executes step S02. In step S02, as shown in FIG. 6, for example, an operator uses a crane or the like to arrange the assembly jig 50 in the assembly area AR. The operator may arrange the assembly jig 50 so that the support tower 60 (the lower part 64 of the tower) can be erected in the center of the assembly area AR. The operator may assemble the assembly jig 50 itself in the assembly area AR, or may transport the pre-assembled assembly jig 50 to the assembly area AR and arrange it. Then, the operator arranges the installation jig 29 at a position where each leg 20 stands. The arrangement positions of the assembly jig 50 and the installation jig 29 are shown, for example, in the structural drawing of the lower jacket 10. For example, the operator arranges the installation jig 29 for positioning the support member 24 at a position separated by a predetermined distance from the leg support portion 90 in the extending direction of the support arm 80. After that, the operator may install the support member 24 at the above-mentioned arrangement position by providing the support member 24 on the installation jig 29. The installation jig 29 has, for example, a bottom surface in contact with the ground and a recess for accommodating the support member 24.

Next, the worker executes step S03. In step S03, for example, the worker arranges the leg 20. Specifically, as shown in FIG. 7, the operator arranges the lower end portion of the main body portion 22 on the support member 24 provided at the above-mentioned arrangement position by using a crane or the like, and the main body concerned. The portion 22 is leaned against the leg support portion 90. At this time, the operator may lean the main body 22 against the leg support 90 so that the intermediate position of the main body 22 is in contact with the leg support 90. Then, the operator may bolt or weld one end of the main body 22 to the support member 24. By executing the arrangement of the support member 24 and the step S03 in step S02, the operator leans each of the four legs 20 against the corresponding leg support portion 90.

In step S02, the operator may connect (weld) the split legs 26a and 26b (main body 22) with the support member 24 lying down on the ground G in addition to the split legs 26a and 26b (main body 22). Then, in step S03, the operator may arrange the lower end portion of the leg 20 composed of the main body portion 22 and the support member 24 on the installation jig 29, and lean the leg 20 against the leg support portion 90. .. In the present specification, in order to arrange the leg 20 on the installation jig 29 and lean the leg 20 against the leg support portion 90, as described above, the leg 20 is placed on the support member 24 on the installation jig 29. This includes arranging the lower end portion of the main body portion 22 and leaning the main body portion 22 against the leg support portion 90.

Next, the worker executes step S04. In step S04, for example, as shown in FIG. 8, the operator places the reinforcing members 30 between the legs 20 adjacent to each other. Specifically, the operator arranges the lower brace 34 and the upper brace 36 of the reinforcing member 30 between the legs 20 adjacent to each other by using a crane or the like, and uses an aerial work platform or the like to arrange each brace. Temporarily fix at least a part of the above to the corresponding leg 20. For example, the operator temporarily attaches and welds (assembles and welds) the braces to the leg 20 to the extent that each brace is held at a predetermined height position. At this time, the operator may temporarily fix all the connection points of the brace to the leg 20, and may not temporarily fix at least a part of the connection points. For example, the operator does not have to temporarily fix the upper end portion 36a (upper end portion of the reinforcing member 30) of the upper brace 36.

Next, the worker executes step S05. In step S05, for example, the operator connects at least a part of the reinforcing member 30 to the leg 20. For example, the operator joins (welds) the lower end portion 34b and the upper end portion 34a of the lower brace 34 and the lower end portion 36b of the upper brace 36 to the leg 20. When welding the lower end portion 34b to the leg 20, the operator may perform the welding work of the lower end portion 34b by forming a scaffold from the ground.

When welding the upper end portion 34a and the lower end portion 36b to the leg 20, the operator first installs a work scaffold 92 (first scaffold) on the leg support portion 90. As an example, as shown in FIG. 8, the operator assembles the scaffold 92 from above the leg support portion 90 (support arm 80) to a height position capable of working on the upper end portion 34a and the lower end portion 36b. The scaffolding 92 is a temporary facility for workers to perform the welding work of the brace to the leg 20, and is fixed on the leg support portion 90 unlike a movable aerial work platform or the like. The scaffolding 92 may be fixed on the support arm 80 in place of the leg support portion 90 or in addition to the leg support portion 90. The scaffolding 92 is made of, for example, a steel pipe, a steel plate, or the like, and includes a staircase for workers to move up and down. Although omitted in FIG. 8, the operator may install scaffolding 92 on each of the four leg support portions 90.

After installing the scaffold 92, the operator welds the upper end 34a and the lower end 36b to the leg 20 of the scaffold 92, respectively. In order to perform the welding work on the scaffold 92, the operator ascends to the support arm 80 through the elevating passage 76 in the support tower 60, and from the support tower 60 to the leg support portion 90 (through the moving passage 82 of the support arm 80). Move to scaffolding 92). After welding the upper end 34a and the lower end 34b of the lower brace 34 and the lower end 36b of the upper brace 36 to the leg 20, the operator may inspect and paint these welded parts.

Next, the worker executes step S06. In step S06, for example, the operator uses a crane or the like to remove at least a part of the assembly jig 50. As an example, the operator first disconnects the tower upper part 62 and the tower intermediate part 68, lifts the support arm 80 and the tower upper part 62 upward by a crane or the like, and conveys the support arm from the assembly area AR. 80 and the upper part of the tower 62 are removed. At this time, the operator may remove the support arm 80 and the tower upper part 62 in a state where the connection between the support arm 80 and the tower upper part 62 is disconnected. Then, the operator removes the tower intermediate portion 68 from the assembly area AR by disconnecting the tower intermediate portion 68 and the tower lower portion 64 and lifting the tower intermediate portion 68 upward by a crane or the like to transport the tower intermediate portion 68. You may. After that, the operator may remove the lower part 64 of the tower and the installation arm 54 from the assembly area AR.

Next, the worker executes step S07. In step S07, for example, the operator conveys the lower jacket 10 from the assembly area AR. As an example, the worker uses a dolly (transport trolley) to transport the lower jacket 10 to the side of the work turret 94. The work turret 94 is a work turret that allows workers to move up and down, and is installed in advance at a place different from the assembly area AR, for example. As shown in FIG. 9, the height of the work turret 94 may be higher than that of the lower jacket 10. If the height position of the lower end of the reinforcing member 30 or the intersection of the lowermost brace is higher than that of the lower part 64 of the tower, in step S06, the operator does not move the lower part 64 of the tower and the installation arm 54. The state of being installed in the assembly area AR may be maintained (the lower part 64 of the tower and the installation portion 52 may not be removed from the assembly area AR).

Next, the worker executes step S08. In step S08, for example, the operator arranges the upper block 40 on the four legs 20 by using a crane or the like. As an example, the worker lifts the upper block 40 manufactured in advance in a building such as a factory to the upper part of the leg 20 with a crane, and aligns (butts) each connection portion 42 of the upper block 40 with the upper end of the leg 20. The upper block 40 is arranged so as to. In step S05, if the upper end 36a of the upper brace 36 is not connected to the leg 20 (the upper end 36a is not welded to the leg 20), the operator can absorb the tolerance. The connection portion 42 of the upper block 40 can be aligned with the upper end of the leg 20 while adjusting the position of the upper end of each of the four legs 20.

Next, the worker executes step S09. In step S09, for example, the operator installs a connecting bridge 98 between the upper block 40 and the work turret 94. That is, the connecting bridge 98 connects the upper block 40 and the work turret 94 arranged next to the area where the four legs 20 are erected so that the worker can move. As a result, the worker can ascend from the ground to the connecting bridge 98 via the working turret 94 and move from the working turret 94 to the upper surface of the upper block 40 through the connecting bridge 98. The work turret 94 may also be used for assembling another support device 1. For example, the operator may install a connecting bridge 98 between the work turret 94 already installed for the other support device 1 and the support device 1 to be assembled. Alternatively, a connecting bridge has already been installed between the work turret 94 and the other support device 1, and the operator further installs the connecting bridge 98 between the other support device 1 and the support device 1 to be assembled. You may. When the work turret 94 is used for assembling a plurality of support devices 1, the heights of the plurality of support devices 1 may be different from each other.

As shown in FIG. 10, in the upper block 40, a work scaffold 96 (second scaffold) is previously provided in a portion (near the connection portion 42) that is connected to the leg 20 when placed on the leg 20. It may be installed. Alternatively, after the upper block 40 is placed on the leg 20 and the connecting bridge 98 is installed, the worker may assemble the working scaffold 96 on the above portion. The scaffold 96 is a temporary facility for an operator to perform joining work (for example, welding work) between the upper block 40 and each leg 20, and is fixed to the upper block 40. The scaffold 96 is installed so that the operator can move to a position where the work can be performed on the upper end 36a of the upper block 40 and the upper brace 36, for example. Like the scaffold 92, the scaffold 96 may be made of a steel pipe, a steel plate, or the like, and may include stairs for workers to move up and down. Although omitted in FIG. 9, the scaffold 96 may be installed in the vicinity of each of the four connecting portions 42 (each of the four legs).

Next, the worker executes step S10. In step S10, for example, the operator joins the upper ends of each of the four legs 20 to the upper block 40, and joins the upper ends of the reinforcing member 30 to the legs 20. As an example, the worker welds the upper end of the leg 20 and the connection portion 42 of the upper block 40 in the work scaffold 96 installed on the upper block 40. The operator may perform welding at the inside and outside of the connection portion 42 and the leg 20, respectively. In this case, the scaffold 96 may include an extension that allows the operator to enter and work inside the connection 42. Examples of the expansion portion include a hanging scaffold (cage-shaped expansion portion) and the like. In addition to welding the upper block 40 and the connecting portion 42, the operator welds the upper end portion 36a of the upper brace 36 and the leg 20 on the scaffolding 96 for work. By joining the upper end portion 36a of the upper brace 36 and the leg 20, the legs 20 adjacent to each other are connected by the reinforcing member 30. As described above, the support device 1 is assembled (manufactured) using the assembly jig 50.

[Effect of Embodiment]
The assembly jig 50 described above includes a support tower 60 standing in the center of the assembly area AR of the support device 1 having four legs 20, four support arms 80 extending radially from the upper part of the support tower 60, and four. Each of the four support arms 80 is provided with four leg support portions 90 for supporting each of the four legs 20 in a state of being erected in the assembly area AR. With this assembly jig 50, the assembly work can be performed with the legs 20 arranged according to the completed shape of the support device 1. That is, after the leg 20 is erected, the parts can be assembled to the leg 20. As a result, the frequency of use of the large lifting machine can be reduced. Therefore, it is useful for efficient assembly work.

As a method of assembling a steel turret having a long leg 20 without using the assembly jig 50, each leg is composed of a plurality of divided legs, and each of the plurality of units including the divided legs is sequentially arranged. A method of assembling steel turrets while stacking them is conceivable. In this case, it is necessary to join (weld) the divided legs with the divided legs standing upright to form a long leg 20. Since high strength and reliability are required for joining the divided legs, the work of joining the upright divided legs becomes complicated. For example, in order to perform welding work, it is necessary to prepare scaffolding at each welding point between the divided legs. On the other hand, by using the assembly jig 50 having the above configuration, the work of joining the standing split legs to each other is reduced. Therefore, the assembly jig 50 is particularly useful when each leg is composed of a split leg.

In the above embodiment, the support tower 60 has an elevating passage 76 that allows an operator to elevate and descend to the four support arms 80. Each of the four support arms 80 has a moving passage 82 that allows the operator to move from the support tower 60 to the leg support 90. In this case, the assembly jig 50 used to support the leg 20 can also be used as a scaffold for aerial work on the leg 20. Therefore, it is more useful for efficient assembly work.

In the above embodiment, the support device 1 further includes a reinforcing member 30 that connects the legs 20 adjacent to each other. The height position of the leg support portion 90 is set in the vicinity of the portion where the reinforcing member 30 is connected to the leg 20. In this case, the assembly jig 50 can also be used as a scaffold for the connection work of the reinforcing member 30. Therefore, it is useful for simplifying the assembly equipment of the support device 1.

In the above embodiment, the reinforcing member 30 includes a plurality of stages of braces arranged so as to be arranged vertically between the legs 20 adjacent to each other and connecting the legs 20 to each other. The height position of the leg support 90 is set in the vicinity between the brace of a plurality of stages. In this case, the assembly jig 50 can also be used for joining the brace in a plurality of stages. Therefore, it is more useful for efficient assembly work.

In the above embodiment, the support tower 60 has a height adjusting portion 66 that changes the height position of the four leg supporting portions 90. In this case, the leg support portion 90 can be arranged at a height position corresponding to the height of the support device 1, and the assembly jig 50 can be used for assembling a plurality of types of support devices 1. ..

In the above embodiment, the support tower 60 further includes a tower lower part 64 that stands on the ground of the assembly area AR and a tower upper part 62 to which the four support arms 80 are connected. The height adjusting portion 66 includes a tower intermediate portion 68 interposed between the tower upper portion 62 and the tower lower portion 64, a connecting portion 72 that detachably connects the tower upper portion 62 and the tower intermediate portion 68, and a tower intermediate portion. Includes a connecting portion 74 that detachably connects the portion 68 and the lower part of the tower 64. In this case, since the height position of the leg support portion 90 can be adjusted by exchanging the tower intermediate portion 68 according to the support device 1, a complicated mechanism for height adjustment becomes unnecessary. Therefore, it is useful for simplifying the assembly jig.

In the above embodiment, each of the four support arms 80 has a length adjusting portion 84 that changes the length from the support tower 60 to the leg support portion 90. In this case, the leg support portion 90 can be arranged at a position corresponding to the inclination of the leg 20 of the support device 1, and the assembly jig 50 can be used for assembling a plurality of types of support devices 1.

In the assembly procedure of the support device 1 described above, the four legs 20 are leaned against the four leg support portions 90 of the assembly jig 50, and the four legs 20 are leaned against the four leg support portions 90, respectively. In the above, the leg 20s adjacent to each other are connected to each other by a reinforcing member 30. In this assembly procedure, the assembly work such as the connection work of the reinforcing member 30 to the leg 20 can be performed with the leg 20 arranged according to the completed shape of the support device 1. That is, after the leg 20 is erected, the reinforcing member 30 can be assembled to the leg 20. As a result, the frequency of use of the large lifting machine can be reduced. Therefore, it is useful for efficient assembly work.

In the above embodiment, to lean the leg 20 against the leg support portion 90, the installation jig 29 is arranged at the position where the leg 20 is erected, and the leg 20 is arranged on the installation jig 29, and the leg 20 is placed on the leg. Includes leaning against the support 90. In this case, the positioning work of the leg 20 and the leaning work of the leg 20 can be performed separately. Therefore, it is easy to lean the leg 20 against the assembly jig.

In the above embodiment, the reinforcing member 30 includes a lower brace 34 that connects the legs 20 adjacent to each other. Connecting the legs 20 adjacent to each other by the reinforcing member 30 means that the legs rise to the support arm 80 via the elevating passage 76 of the support tower 60 and the leg is supported from the support tower 60 via the moving passage 82 of the support arm 80. It may include moving to the portion 90 and joining the upper end portion 34a of the lower brace 34 to the leg 20 at the leg support portion 90. In this case, since the assembly jig 50 can be used as a scaffolding in the joining work of the upper end portion 34a of the lower brace 34, it is useful for simplifying the assembly equipment of the support device 1. For example, when the assembly jig 50 is not used for the joining work, it is necessary to assemble a scaffold from the ground to the upper end portion 34a of the lower brace 34. On the other hand, in the above configuration, it is not necessary to build a scaffold from the ground, so that the assembly equipment is simplified.

In the above embodiment, joining the upper end portion 34a of the lower brace 34 to the leg 20 in the leg support portion 90 means that the upper end portion 34a of the lower brace 34 is joined to the lower brace 34 in the work scaffolding 92 installed in the leg support portion 90. Includes joining to leg 20. In this case, by using the scaffolding 92, the joining work between the upper end portion 34a of the lower brace 34 and the leg 20 becomes easy. Therefore, it is more useful for efficient assembly work.

In the above embodiment, the reinforcing member 30 further includes an upper brace 36 which is arranged above the lower brace 34 between the legs 20 adjacent to each other and connects the legs 20 to each other. Connecting the legs 20 adjacent to each other by the reinforcing member 30 includes joining the lower end portion 36b of the upper brace 36 to the leg 20 in the leg support portion 90. In this case, the assembly jig 50 can also be used as a scaffold for the joining work between the upper end portion 34a of the lower brace 34 and the lower end portion 36b of the upper brace 36 and the leg 20. Therefore, it is more useful for efficient assembly work.

The procedure for assembling the support device 1 according to the above embodiment is to arrange the upper block 40 on at least three legs 20 and to join the upper ends of each of the at least three legs 20 to the upper block 40. Further included. Joining the upper ends of each of the at least three legs 20 to the upper block 40 includes joining the upper ends of the legs 20 to the upper block 40 in a working scaffold 96 installed on the upper block 40. In this case, since the aerial work platform extending to the upper block 40 located at the upper end of the support device 1 is unnecessary, it is more useful for simplifying the assembly equipment.

Connecting the legs 20 adjacent to each other by the reinforcing member 30 means joining at least a part of the reinforcing member 30 except the upper end portion to the leg 20 and joining the upper block 40 to the leg 20 before arranging the upper block 40. This includes joining the upper end of the reinforcing member 30 to the leg after placement. In this case, by using the scaffolding 96 for joining the upper block 40, it is possible to perform the joining work with respect to the upper end portion of the reinforcing member 30. Further, since the upper end portion of the reinforcing member 30 is not connected to the leg 20 before the arrangement of the upper block 40, the positioning of the upper block 40 and each leg 20 is easy. Therefore, it is more useful for efficient assembly work.

In the above embodiment, joining the upper end of each of the four legs 20 to the upper block 40 is between the upper block 40 and the work turret 94 arranged next to the area where the four legs 20 are erected. Further includes the installation of the connecting bridge 98 in the work turret 94 and the movement from the work turret 94 through the connecting bridge 98 to the upper block 40. In this case, the work can be performed on the upper block 40 by moving to the upper block 40 via the work turret 94 and the connecting bridge 98. Therefore, even if the upper block is located at a high place, it can be easily moved to the upper block, which is useful for efficient assembly work.

In the support device 1 according to the above embodiment, the legs 20 are composed of pipe-shaped split legs, and the split legs are welded from the inside and the outside from the viewpoint of strength. For example, since the support device for a power generation device using offshore wind power is installed under strong wind, a stronger connection is required. If the split legs are stacked and connected in the vertical direction without using the assembly jig 50, it is difficult for the worker to enter the inside of the split legs in the upright state and work. Even if it is possible to work inside, it is necessary to provide scaffolding both inside and outside the legs at each weld between the split legs. On the other hand, by using the assembly jig 50, the support device 1 can be assembled even if the split legs are connected to each other in a state of being laid on the ground. Therefore, the assembly jig 50 and the above-mentioned assembly method Is particularly useful when a long pipe-shaped leg 20 is used.

[Modification example]
The support device 1 may include three legs 20 or five or more legs 20. The support device 1 may be a steel turret that supports some device, and is not limited to the substructure on which the power generation device is mounted. Further, the steel turret to be assembled by the assembly jig may be a steel tower having an iron frame structure. In this case, the steel frames (divided legs) constituting the tower may be connected by bolts.

1 ... Support device (steel turret), 10 ... Lower jacket, 20 ... Leg, 22 ... Main body, 24 ... Support member, 29 ... Installation jig, 30 ... Reinforcing member, 34 ... Lower brace, 34a ... Upper end, 34b ... Lower end, 36 ... Upper brace, 36a ... Upper end, 36b ... Lower end, 40 ... Upper block, 42, 44 ... Connection, 50 ... Assembly jig, 52 ... Installation, 54 ... Installation arm, 60 ... Support tower, 62 ... Tower upper part, 64 ... Tower lower part, 66 ... Height adjustment part, 68 ... Tower middle part, 72, 74 ... Connecting part, 76 ... Elevating passage, 76a ... Elevating equipment, 76b ... Entrance, 80 ... Support arm, 80a ... 1st arm, 80b ... 2nd arm, 82 ... Movement passage, 84 ... Length adjustment part, 86 ... Arm middle part, 88a, 88b ... Connecting part, 92 ... Scaffolding, 94 ... Work Tower, 96 ... scaffolding, 98 ... connecting bridge, CL ... central axis, G ... ground, AR ... assembly area.

Claims (15)

A support tower erected in the center of the steel turret assembly area with at least three legs,
At least three support arms that radiate from the top of the support tower,
A jig for assembling a steel turret, each of which is provided at the tip of at least three support arms and includes at least three leg support portions that support each of the at least three legs in a state of being erected in the assembly area. The support tower has an elevating passage that allows an operator to elevate and elevate to the at least three support arms.
The assembly jig according to claim 1, wherein each of the at least three support arms has a moving passage that allows the operator to move from the support tower to the leg support portion. The steel turret further includes a reinforcing member that connects adjacent legs of the at least three legs to each other.
The assembly jig according to claim 1 or 2, wherein the height position of the leg support portion is set in the vicinity of a portion where the reinforcing member is connected to the leg. The reinforcing member includes a plurality of stages of braces arranged so as to be arranged in the vertical direction between the legs adjacent to each other and connecting the legs.
The assembly jig according to claim 3, wherein the height position of the leg support portion is set in the vicinity between the brace of the plurality of stages. The assembly jig according to any one of claims 1 to 4, wherein the support tower has a height adjusting portion that changes the height position of the at least three leg supporting portions. The support tower further comprises a lower part of the tower that stands on the ground in the assembly area and an upper part of the tower to which the at least three support arms are connected.
The height adjusting portion includes a tower intermediate portion interposed between the tower upper portion and the tower lower portion, a connecting portion that detachably connects the tower upper portion and the tower intermediate portion, and the tower intermediate portion. The assembly jig according to claim 5, further comprising a connecting portion that detachably connects the lower part of the tower and the lower part of the tower. The assembly jig according to any one of claims 1 to 6, wherein each of the three support arms has a length adjusting portion for varying the length from the support tower to the leg support portion. The at least said assembly jig comprising a support tower, at least three support arms radiating from the top of the support tower, and at least three leg supports provided at the tips of the at least three support arms, respectively. At least three legs should be leaned against each of the three leg supports,
A method for assembling a steel turret, which comprises connecting adjacent legs to each other by a reinforcing member in the at least three legs leaning against the at least three leg supports. Leaning the leg against the leg support
Placing the installation jig at the position where the leg stands and
The assembly method according to claim 8, further comprising arranging the leg on the installation jig and leaning the leg against the leg support portion. The reinforcing member includes a first brace that connects the legs adjacent to each other.
Connecting the legs adjacent to each other with the reinforcing member
Ascending to the support arm through the elevating passage of the support tower,
Moving from the support tower to the leg support portion via the moving passage of the support arm, and
The assembly method according to claim 8 or 9, wherein the upper end portion of the first brace is joined to the leg at the leg support portion. In the leg support portion, joining the upper end portion of the first brace to the leg means joining the upper end portion of the first brace to the leg in the first scaffolding for work installed on the leg support portion. 10. The assembly method of claim 10. The reinforcing member further includes a second brace that is arranged above the first brace between the legs adjacent to each other and connects the legs to each other.
The assembly method according to claim 10 or 11, wherein connecting the adjacent legs to each other by the reinforcing member includes joining the lower end portion of the second brace to the leg at the leg support portion. Placing the top block on top of the at least three legs
Further including joining the upper end of each of the at least three legs to the upper block.
Joining the upper end of each of the at least three legs to the upper block includes joining the upper end of the leg to the upper block in a second working scaffold installed on the upper block. , The assembly method according to any one of claims 8 to 12. Connecting the legs adjacent to each other with the reinforcing member
Prior to the placement of the upper block, at least a part of the reinforcing member except the upper end is joined to the leg.
13. The assembly method of claim 13, comprising joining the upper end of the reinforcing member to the leg after arranging the upper block. Joining the upper end of each of the at least three legs to the upper block provides a connecting bridge between the upper block and a work turret located next to the area where the at least three legs are erected. To install and
The assembly method according to claim 13 or 14, further comprising moving from the work turret to the upper block through the connecting bridge.

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