Large pile-circling crane base and construction method thereof

Abstract

The present invention relates to the field of shipbuilding technology, and discloses a large pile-circling crane base, comprising a base, a mounting base disposed on top of the base, and a connecting base disposed on top of the mounting base. The bottom of the base is fixedly connected to the hull structure, and the mounting base includes three box-shaped legs, which enclose a mounting cavity for mounting a lifting device, and a mounting hole for a lifting unit assembly of the lifting device is formed between two adjacent box-shaped legs. The three box-shaped legs are respectively a first box-shaped leg, a second box-shaped leg, and a third box-shaped leg. The first box-shaped leg is a long strip box-shaped structure, and the second and third box-shaped legs are both triangular box-shaped structures, and the second and third box-shaped legs are axially symmetrical structures. The present invention can solve the problem of difficult installation and disassembly of the lifting unit assembly of the lifting device, has low overall processing difficulty, and is suitable for large pile-circling cranes with a lifting capacity of more than 2,000 tons.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a large-scale pile-circling crane base and a construction method thereof. Background Art

[0002] With the rapid development of the offshore wind power industry, offshore wind farms have also begun to move into the deep sea. The number of offshore wind power projects with a single unit capacity of 10MW and above has increased continuously, and the demand for the lifting capacity of offshore wind power installation platform cranes is higher. The lifting capacity has developed from 800 to 1200 tons to 2000 tons and is gradually increasing. As the main lifting equipment of offshore wind power platforms, pile-circling cranes have higher requirements for the structural form of the crane base as the lifting capacity increases. For offshore wind power installation platforms above 1200 tons, the pile legs are changed from cylindrical to truss type as the operating water depth is required. The lifting of the truss pile legs relies on a gear-type lifting device, which is installed inside the pile-circling crane base. The existing pile-circling crane bases of 1200 tons and below have smaller lifting devices, and use door-type holes corresponding to the four surrounding walls of the pile-circling crane base for the installation and replacement of the lifting unit in the lifting device (such as Figures 1-2 However, as the lifting capacity of pile-circling cranes increases, the number of lifting units in the lifting device increases, and the volume of the lifting device increases. The original solution of setting door holes in the surrounding wall of the pile-circling crane base can no longer meet the use requirements of the pile-circling crane base in terms of structural strength and overall layout. Summary of the Invention

[0003] The purpose of the present invention is to provide a large pile-circling crane base and a construction method thereof, which can solve the problem of difficulty in installing and disassembling the lifting unit group of the lifting device, has low overall processing difficulty, and is suitable for large pile-circling cranes with a capacity of more than 2,000 tons.

[0004] In order to achieve the above-mentioned purpose, one aspect of the present invention provides a large-scale pile-circling crane base, comprising a base, a mounting base arranged on the top of the base and a connecting base arranged on the top of the mounting base, the bottom of the base is fixedly connected to the hull structure, the mounting base comprises three box-shaped legs, the three box-shaped legs enclose a mounting cavity for installing a lifting device, the top of the outer peripheral edge of the box-shaped legs is fixedly connected to the connecting base, and a mounting hole for cooperation with a lifting unit group of the lifting device is formed between two adjacent box-shaped legs; the cross-section of the mounting base is square; the three box-shaped legs are respectively a first box-shaped leg, a second box-shaped leg and a third box-shaped leg, the first box-shaped leg is a long box-shaped structure, the second box-shaped leg and the third box-shaped leg are both triangular box-shaped structures, and the second box-shaped leg and the third box-shaped leg are axially symmetrical structures.

[0005] As a preferred solution of the present invention, two sides above the first box-shaped leg are respectively provided with connecting portions extending to the second box-shaped leg and extending to the third box-shaped leg.

[0006] As a preferred solution of the present invention, reinforcing ribs are provided in the inner cavity of the first box-shaped leg, the inner cavity of the second box-shaped leg, and the inner cavity of the third box-shaped leg.

[0007] As a preferred solution of the present invention, the upper portion of the second box-shaped leg is connected to the upper portion of the third box-shaped leg via a connecting bar, and the lower portion of the connecting bar is provided with a top arc portion of the mounting hole.

[0008] As a preferred solution of the present invention, the edge of the mounting hole is 10 mm to 40 mm away from the lifting unit group.

[0009] As a preferred solution of the present invention, the edge of the mounting hole is 20 mm away from the lifting unit assembly.

[0010] As a preferred solution of the present invention, the bottom of the base is provided with a reinforcing bracket embedded in the hull structure, and the inner wall of the connecting seat is provided with a reinforcing rib.

[0011] In addition, another aspect of the present invention provides a method for constructing a large pile-circling crane base, comprising the following steps:

[0012] Step 1: prefabricate a connecting seat, a first box-shaped leg, a second box-shaped leg, and a third box-shaped leg;

[0013] Step 2: When the hull structure is manufactured, a base is manufactured on the hull structure;

[0014] Step 3: After all the lifting units of the lifting device are hoisted, the second box-shaped support leg and the third box-shaped support leg are hoisted to the preset positions on the periphery of the lifting device;

[0015] Step 4: erecting scaffolding on the inner side of the second box-shaped support leg and the inner side of the third box-shaped support leg;

[0016] Step 5: Use the scaffolding of step 4 to weld the joints between the lifting unit groups;

[0017] Step 6: hoist the first box-shaped leg to a preset position on the periphery of the lifting device, and use the scaffolding of step 4 to weld the joints between the first box-shaped leg, the second box-shaped leg, and the third box-shaped leg;

[0018] Step 7: Hoist the connecting seat and weld the joint between the mounting seat and the connecting seat.

[0019] As a preferred solution of the present invention, in step six, the hoisting connecting bar is placed between the upper portion of the second box-shaped supporting leg and the upper portion of the third box-shaped supporting leg and connected through a scaffold.

[0020] Compared with the prior art, the large-scale pile-circling crane base and the construction method thereof according to the embodiment of the present invention have the following advantages:

[0021] The present invention solves the problem of difficulty in installing and disassembling the lifting unit group of the lifting device in the base of a large pile-circling crane through the three split box-shaped support legs, and the interior of each box-shaped support leg is an independent cabin, which increases the equipment layout and storage space on board and improves the supporting effect at the same time; in addition, the existing pile-circling crane base wall is usually made of four sheet segments and then closed as a whole, while the present invention is divided into three sections through three box-shaped support legs, which reduces one segmentation station in the pile-circling crane base and one closing welding process, has low overall processing difficulty, is easy to use, and is suitable for large pile-circling cranes with a capacity of more than 2,000 tons. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the structure of the existing 1200-ton pile-circling crane base;

[0024] Figure 2 This is a cross-sectional view of the existing 1200-ton pile-encircling crane base;

[0025] Figure 3 A left side view of a large pile-circling crane base provided by the present invention;

[0026] Figure 4 yes Figure 3 Exploded diagram;

[0027] Figure 5 This is a right side view of a large pile-circling crane base provided by the present invention;

[0028] Figure 6 It is Figure 5 Cross-sectional view of AA;

[0029] Figure 7 It is Figure 5 Cross-sectional view of the middle BB;

[0030] In the figure, 1 is the base; 11 is the reinforcing elbow plate; 2 is the mounting seat; 21 is the first box-shaped leg; 22 is the second box-shaped leg; 23 is the third box-shaped leg; 24 is the mounting hole; the connecting strip; 3 is the connecting seat; 4 is the lifting device; and 41 is the lifting unit group. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] like Figures 3 to 7 As shown, a large pile-circling crane base according to a preferred embodiment of the present invention is provided. The pile-circling crane is provided on the pile legs of an offshore wind power platform. The large pile-circling crane base includes a base 1, a mounting seat 2 provided on the top of the base 1, and a connecting seat 3 provided on the top of the mounting seat 2. The bottom of the base 1 is fixedly connected to the hull structure. The mounting seat 2 includes three box-shaped legs. The three box-shaped legs enclose an installation cavity for installing a lifting device 4. The outer periphery top of the box-shaped legs is fixed to the connecting seat 3. The connection is formed between two adjacent box-shaped legs, and a mounting hole 24 is formed between the two adjacent box-shaped legs for cooperation with the lifting unit group 41 of the lifting device 4; the cross-section of the mounting seat 2 is square; the three box-shaped legs are respectively the first box-shaped leg 21, the second box-shaped leg 22 and the third box-shaped leg 23, the first box-shaped leg 21 is a long box-shaped structure, the second box-shaped leg 22 and the third box-shaped leg 23 are both triangular box-shaped structures, and the second box-shaped leg 22 and the third box-shaped leg 23 are axially symmetrical structures. Among them, the lower part of the connecting seat 3 is a square structure that cooperates with the mounting seat 2, and the upper part of the connecting seat 3 is a cylindrical structure. The connecting seat 3 serves as a transition part connecting the crane revolving base plate and the hull structure. The box-shaped legs can be understood as a structure with a cavity formed by enclosing multiple plates.

[0034] On the mounting base 2, mounting holes 24 are set according to the position of the lifting device 4. The mounting holes 24 on the base of a conventional pile-circling crane are arranged on the wall on one side of the base, but the lifting device 4 of the base of a large pile-circling crane is larger and has more lifting units. The two mounting holes 24 close to the ship's side (i.e., the mounting hole 24 formed between the first box-shaped leg 21 and the second box-shaped leg 22, and the mounting hole 24 formed between the first box-shaped leg 21 and the third box-shaped leg 23) are arranged at the two corners of the box structure to facilitate the installation of the lifting unit group 41.

[0035] Exemplarily, connecting portions extending to the second box-shaped leg 22 and the third box-shaped leg 23 are respectively provided on both sides above the first box-shaped leg 21 to improve the overall installation strength of the mounting base 2 .

[0036] Exemplarily, the inner cavity of the first box-shaped leg 21 , the inner cavity of the second box-shaped leg 22 , and the inner cavity of the third box-shaped leg 23 are all provided with reinforcing ribs to improve the structural strength of the box-shaped legs.

[0037] Exemplarily, the upper part of the second box-shaped leg 22 is connected to the upper part of the third box-shaped leg 23 by a connecting bar 25, and the lower part of the connecting bar 25 is provided with the top arc portion of the mounting hole 24, which reinforces the strength loss of the base structure of the large pile-circling crane caused by the opening of the mounting hole 24; the upper part of the base 1 is provided with the bottom arc portion of the mounting hole 24, wherein the lower end of the mounting hole 24 is provided with a structural soft toe end, which effectively reduces the stress concentration at the lower end of the mounting hole 24.

[0038] Exemplarily, the edge of the mounting hole 24 is 10 mm to 40 mm away from the lifting unit group 41. Preferably, the edge of the mounting hole 24 is 20 mm away from the lifting unit group 41. The mounting hole 24 of the base of the large pile crane meets the domestic maximum installation dimensions of 12 sets of lifting units. The upper end of the mounting hole 24 has a rounded transition, and the size of the rounded corner is designed based on the shape of the lifting unit to meet the installation and disassembly dimensions of the lifting unit while ensuring that the opening size is minimized.

[0039] Exemplarily, the bottom of the base 1 is provided with a reinforcing bracket 11 embedded in the hull structure, and the reinforcing bracket 11 is located at the four corners of the base 1. The structural reinforcing bracket 11 is set at the force concentrated position at the lower end of the large pile-circling crane base to ensure that the structural strength of the connection between the large pile-circling crane base and the main hull structure is high; the inner wall of the connecting seat 3 is provided with reinforcing ribs to improve its structural strength.

[0040] In this embodiment, the lifting device 4 includes three groups of lifting units 41 installed in the base of a large pile-circling crane. Each group of lifting units 41 has 12 lifting units, and the weight of each lifting unit is 13 tons, that is, the lifting device 4 has a total of 36 lifting units; the weight and number of lifting units are basically twice that of a 1200-ton pile-circling crane. Usually, each group of lifting units 41 of a 1200-ton pile-circling crane has 8 lifting units, and its overall height is 5.3 meters, which can be installed by a forklift; but in this embodiment, each group of lifting units 41 is provided with 12 lifting units, and its overall height is 9 meters, and a crane must be used for installation. In order to ensure that the lifting units are easy to install and disassemble, the external dimensions of the pile-circling crane must be designed to fit the outer contour of the lifting device 4, and to ensure that the lifting units can be lifted using a car crane or a crawler crane. In this way, the overall weight of the base of the large pile-circling crane in this embodiment is 800 tons.

[0041] In addition, the present invention also provides a method for constructing a large pile-circling crane base, which is characterized by comprising the following steps:

[0042] Step 1: prefabricate the connecting seat 3, the first box-shaped leg 21, the second box-shaped leg 22 and the third box-shaped leg 23;

[0043] Step 2: When the hull structure is manufactured, the base 1 is manufactured on the hull structure. The base 1 is manufactured together with the hull structure, which can reduce the difficulty of hoisting and inserting the base 1 and improve the manufacturing accuracy;

[0044] Step 3: After all the lifting units 41 of the lifting device 4 are hoisted, the second box-shaped legs 22 and the third box-shaped legs 23 are hoisted to the preset positions on the periphery of the lifting device 4;

[0045] Step 4: Set up scaffolding on the inner side of the second box-shaped support leg 22 and the inner side of the third box-shaped support leg 23;

[0046] Step 5: Use the scaffolding of step 4 to weld the joints between the lifting unit groups 41;

[0047] Step 6: hoist the first box-shaped leg 21 to a preset position on the periphery of the lifting device 4, and use the scaffolding of step 4 to weld the joints between the first box-shaped leg 21, the second box-shaped leg 22, and the third box-shaped leg 23;

[0048] Step seven: hoist the connecting seat 3 and weld the joint between the mounting seat 2 and the connecting seat 3.

[0049] In this way, the construction method of the large pile-circling crane base can complete the welding work of the mounting seat 2 in the middle of the large pile-circling crane base and the base 1 at the bottom in advance.

[0050] At the same time, the assembly operation of the lifting device 4 and the middle mounting base 2 can share a set of scaffolding, reducing a lot of scaffolding erection and dismantling work. In the construction process of the existing pile-circling crane base, two sets of scaffolding are required: one set of scaffolding is used for the assembly operation of the lifting device 4, and the other set of scaffolding is used for the folding and assembly operation of the pile-circling crane base.

[0051] For example, in step 6, the connecting bar 25 is hoisted between the upper portion of the second box-shaped leg 22 and the upper portion of the third box-shaped leg 23 and connected through the scaffolding. The ends of the connecting bar 25 are provided with assembly negative margins to facilitate structural embedding construction.

[0052] In addition, in this embodiment, with the pile leg center as the center of the circle, a pile leg reference line is set along the ship width direction, and the pile leg base line is the installation reference line of the pile leg and the lifting device 4 in this embodiment. The pile leg reference line is used as the baseline and rotated 120° to the left and right to make the installation reference line of the large pile-circling crane base. Yang Chong marks are made on the reference line positions of the mounting seat 2, the base 1 and the lifting device 4 of the large pile-circling crane base. When the mounting seat 2 and the base 1 in the large pile-circling crane base are closed, the Yang Chong position is strictly checked for up-down, left-right, front-back alignment to ensure that the closing accuracy between the mounting seat 2 and the base 1 is high; Yang Chong marks are marked at the 90°+100 positions on the front and back of the upper closing opening of the mounting seat 2 and the lower closing opening of the connecting seat 3. When the mounting seat 2 and the connecting seat 3 are closed, the Yang Chong position is strictly checked for up-down, left-right, front-back alignment to ensure that the closing accuracy between the mounting seat 2 and the connecting seat 3 is high.

[0053] In summary, the present invention can solve the problem of difficult installation and disassembly of the lifting unit group 41 of the lifting device 4 in the base of a large pile-circling crane through the three split box-shaped support legs, and the interior of each box-shaped support leg is an independent cabin, which increases the equipment layout and storage space on the ship, and improves the support effect at the same time; in addition, the existing pile-circling crane base wall is usually made of four sheet segments and then closed as a whole, while the present invention is divided into three sections through three box-shaped support legs, which reduces one segmentation station in the pile-circling crane base and one closing welding process, with low overall processing difficulty and easy use, and is suitable for large pile-circling cranes weighing more than 2,000 tons.

[0054] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for constructing a large pile-circling crane base, characterized in that: The base of a large pile-circling crane includes a base, a mounting seat arranged on the top of the base and a connecting seat arranged on the top of the mounting seat. The bottom of the base is fixedly connected to the hull structure. The mounting seat includes three box-shaped legs. The three box-shaped legs enclose a mounting cavity for installing a lifting device. The top of the outer periphery of the box-shaped legs is fixedly connected to the connecting seat. A mounting hole for the lifting unit group of the lifting device to cooperate is formed between two adjacent box-shaped legs. The cross-section of the mounting seat is square. The box-shaped legs are enclosed by a plurality of plates to form a structure with a cavity. The three The box-shaped legs are respectively a first box-shaped leg, a second box-shaped leg and a third box-shaped leg, the first box-shaped leg is a long box-shaped structure, the second box-shaped leg and the third box-shaped leg are both triangular box-shaped structures, and the second box-shaped leg and the third box-shaped leg are axially symmetrical structures, the upper part of the second box-shaped leg is connected to the upper part of the third box-shaped leg by a connecting strip, and the lower part of the connecting strip is provided with a top arc portion of the mounting hole, and the upper two sides of the first box-shaped leg are respectively provided with connecting portions extending to the second box-shaped leg and the third box-shaped leg; The method for constructing the large pile-circling crane base comprises the following steps: Step 1, prefabricating a connecting seat, a first box-shaped support leg, a second box-shaped support leg, and a third box-shaped support leg; Step 2: When the hull structure is manufactured, a base is manufactured on the hull structure; Step 3: After all the lifting units of the lifting device are hoisted, the second box-shaped support leg and the third box-shaped support leg are hoisted to the preset positions on the periphery of the lifting device; Step 4: erecting scaffolding on the inner side of the second box-shaped support leg and the inner side of the third box-shaped support leg; Step 5: Use the scaffolding of step 4 to weld the joints between the lifting unit groups; Step 6: hoist the first box-shaped leg to a preset position on the periphery of the lifting device, and use the scaffolding of step 4 to weld the joints between the first box-shaped leg, the second box-shaped leg, and the third box-shaped leg; Step 7: Hoist the connecting seat and weld the joint between the mounting seat and the connecting seat.

2. The method for constructing a large pile-circling crane base according to claim 1, wherein: Reinforcement ribs are provided in the inner cavity of the first box-shaped leg, the inner cavity of the second box-shaped leg, and the inner cavity of the third box-shaped leg.

3. The method for constructing a large pile-circling crane base according to claim 1, wherein: The distance between the edge of the mounting hole and the lifting unit group is 10 mm to 40 mm.

4. The method for constructing a large pile-circling crane base according to claim 1, wherein: The edge of the mounting hole is 20 mm away from the lifting unit assembly.

5. The method for constructing a large pile-circling crane base according to claim 1, wherein: The bottom of the base is provided with a reinforcing bracket embedded in the hull structure, and the inner wall of the connecting seat is provided with a reinforcing rib.

6. The method for constructing a large pile-circling crane base according to claim 1, wherein: In step six, the connecting bar is hoisted between the upper portion of the second box-shaped support leg and the upper portion of the third box-shaped support leg and connected through a scaffold.

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