An assembly method for the base structure of the large crane's round top and square bottom

Abstract

The present invention discloses an assembly method for the structure of the round-to-square base of a large crane, which includes dividing the plate members of the outer plate structure into a flat area and a curved surface area, and performing horizontal lofting expansion and layout; manufacturing a processing sample box and a template for control inspection; manufacturing the plate members of the outer plate structure, and comparing and detecting the shape of the plate members in the curved surface area with the processing sample box and the template; after passing the inspection, setting the machining allowance; drawing the ground sample lines of the top circle and the bottom square on the manufacturing site, marking the center of the circle and making a center punch mark, and manufacturing the overall installation jig according to the circular ground sample line; performing reverse assembly in the direction from the top circle to the bottom square according to the jig, the top circular ground sample line and the bottom square ground sample line; installing the internal support and strengthening structure; installing the support members inside the openings in the top circle and the bottom direction; and finally arranging an even number of welders for overall welding; having the beneficial effects of simple and efficient assembly, convenient welding, higher precision and improved construction efficiency.

Description

Technical Field

[0001] The present invention relates to the field of ship and marine engineering equipment manufacturing, and particularly relates to an assembly method for the structure of the round-to-square base of a large crane. Background Art

[0002] During the construction of marine engineering ships or offshore platform products, the base of a large crane often needs to be manufactured by the shipyard, including the outer plate structure of the round-to-square part. The circular part at the top of this structure is connected to the circular body structure of the crane, and the square part at the bottom is connected to the hull or platform. The force received by the crane is transmitted from the circular cylinder through this round-to-square structure to the hull or platform. This round-to-square structure is the base part of the crane and is a key load-bearing component during the operation of the crane.

[0003] This round-to-square steel structure is usually large in size. Especially for the base of a large crane, the diameter of the upper circular part is 13.9 meters, the size of the lower square opening is about 16.1 * 14.4 meters, and the thickness of all outer plates is relatively thick at 60 mm, making its processing very difficult. Horizontally, there are only the upper circular opening and the middle position supported by T-shaped materials inside the internal components, and there is no horizontal structure at the bottom port position, making the shape difficult to control. In addition, all outer plates are evenly arranged with vertical structures along the vertical direction. These structures are made of special EH550 material, and this material needs to be preheated to about 150 °C before welding; therefore, the assembly of this round-to-square steel structure is difficult, the welding is prone to deformation, the accuracy is difficult to control, a large amount of labor costs are invested, and the production efficiency is not high. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an assembly method for the structure of the round-to-square base of a large crane to solve...

[0005] To solve the above technical problems, the technical solution of the present invention is: an assembly method for the structure of the round-to-square base of a large crane, including the following steps:

[0006] Step S01: Divide the plate parts of the outer plate structure into a flat area and a curved area, and perform horizontal lofting expansion and layout;

[0007] Step S02: Make a processing sample box and a template for control inspection;

[0008] Step S03: Make the plate parts of the outer plate structure, and compare and detect the shape of the plate parts in the curved area with the processing sample box and the template; after passing the inspection, set the processing allowance;

[0009] Step S04: Draw the ground sample lines of the upper circle and the lower square on the production site, mark the center of the circle and make center punch marks, and make an overall installation jig according to the circular ground sample line;

[0010] Step S05: Perform reverse assembly from the top circle to the bottom square according to the jig, the top circular ground pattern line, and the bottom square ground pattern line;

[0011] Step S06: Install the internal support and reinforcement structure;

[0012] Step S07: Install supports inside the openings at the top circle and the bottom direction;

[0013] Step S08: Finally, arrange an even number of welders to perform overall welding.

[0014] Preferably, in step S01, it specifically includes dividing the plate members of the outer plate structure into four straight regions and four curved surface regions along the tangent line, and the curved surface regions include several top circular opening plate members and corner plate members, and performing horizontal lofting expansion and layout on the straight regions and the curved surface regions; and leaving a machining allowance of 100 mm on one side of the curved surface region.

[0015] Preferably, the straight region is trapezoidal.

[0016] Preferably, in step S02, several processing sample boxes and templates are provided, and their shapes correspond to the shapes of each plate member in the curved surface region respectively; and the processing sample boxes and templates are provided with machining allowances.

[0017] Preferably, in step S04, the overall installation jig further includes using a round pipe with a diameter of 310 mm, adding a 20-mm-thick backing plate at the top of the round pipe as support, and setting the height of the jig to 700 mm, and arranging 32 of them evenly according to the round opening of the round sky and square earth.

[0018] Preferably, in step S04, it further includes marking the round opening contour line on the jig, and the radius of the marked installation line is 5 mm larger than the radius of the original round opening contour line, and using a center punch to make marks.

[0019] Preferably, in step S05, the reverse assembly includes the following steps:

[0020] Step S51: Fix and install the top circular opening plate members, and make the top circle coincide with the circular ground pattern line, suspend plumb lines at the four corners of the bottom square to coincide with the corner point cross ground pattern line, and ensure that the four sides of the square are straight lines;

[0021] Step S52: Fix and install the T-shaped profiles at the round opening positions at the top round opening, and perform support and reinforcement inside the round opening T-shaped profiles;

[0022] Step S53: Hoist the plate members in the plane area in sequence, and use a plumb bob to adjust the center of the plane plate members, the center line of the ground pattern line, and the contour line to be aligned at the center line and both ends of the plate members, so as to determine the accurate positioning of the plane plate members;

[0023] Step S54: Finally, install the outer plates at the four corner positions respectively.

[0024] Preferably, when manufacturing the plate members in the planar area in step S53, by pre-manufacturing the plate members in the planar area on flat ground, the support structure of the planar area sheet can also be installed on the plate members in the planar area in advance and welded to completion.

[0025] Preferably, in step S06, weld and fix the first vertical support member, the second vertical support member and the T-shaped profile at the middle position.

[0026] Preferably, in step S07, a first support pipe in a cross shape is arranged at the top circular opening, and a second support pipe in a grid shape is arranged at the bottom square opening for support and strengthening.

[0027] The technical effects of the present invention are mainly reflected as follows: Compared with the prior art, the present invention first manufactures a processing sample box and a template corresponding to the shape of the plate member, and reserves corresponding machining allowances on the processing sample box and the template, so as to facilitate the shape detection of the manufactured plate member and the setting of machining allowances, thereby achieving higher precision compared with the prior art; by using a jig, a top circular ground line and a bottom square ground line, and performing reverse state assembly from the top circular to the bottom square direction, it not only facilitates the hoisting of components and improves the assembly efficiency, but also plays a role in facilitating positioning and installation, thereby improving the construction efficiency, and also avoids the overhead installation and overhead welding caused by the normal state production of the plate member, making it more convenient for welding construction; and the diameter control error of the manufactured top circle is controlled within ±5 mm, and the side length and diagonal of the bottom square are controlled within ±5 mm, effectively ensuring the assembly and docking accuracy of the round sky and square earth steel structure with other components. Description of the Drawings

[0028] Figure 1 is the assembly flow block diagram of the present invention;

[0029] Figure 2 is the fully unfolded view of the present invention;

[0030] Figure 3 is the unfolded view of the curved surface area;

[0031] Figure 4 is the three-dimensional schematic diagram of the present invention;

[0032] Figure 5 is the structural schematic diagram of the first vertical support member;

[0033] Figure 6 is the ground line schematic diagram of the top circle and the bottom square;

[0034] Figure 7 is the structural schematic diagram of the first support pipe;

[0035] Figure 8 It is a structural schematic diagram of the second support pipe.

[0036] The reference numerals in the drawings are: A - flat area, B - curved surface area, 11 - first corner plate member, 12 - second corner plate member, 13 - third corner plate member, 21 - first round - mouth plate member, 22 - second round - mouth plate member, 31 - first vertical support member, 32 - second vertical support member, 33 - intermediate position T - shaped section, 4 - round - mouth T - shaped section, 5 - first support pipe, 6 - second support pipe. Specific embodiments

[0037] The following further details the specific embodiments of the present invention in conjunction with the drawings, so that the technical solutions of the present invention are easier to understand and master.

[0038] In this embodiment, it should be understood that the orientation or positional relationship indicated by terms such as "middle", "upper", "lower", "top", "right side", "left end", "above", "back", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention.

[0039] In addition, in this specific embodiment, if the connection or fixing method between components is not specifically described, the connection or fixing method can be bolt fixing, nail - pin fixing, or pin - shaft connection, etc., which are commonly used in the prior art. Therefore, it will not be elaborated in this embodiment.

[0040] An assembly method for the round - to - square base structure of a large - scale crane, as Figure 1-8 shown, includes the following steps:

[0041] Step S01: Divide the plate members of the outer - plate structure into a flat area and a curved - surface area, and perform horizontal lofting expansion and layout;

[0042] Preferably, in step S01, it specifically includes dividing the plate members of the outer - plate structure along the tangent into four flat areas and four curved - surface areas of the corner parts. And the curved - surface area includes several top round - mouth plate members and corner plate members, and horizontal lofting expansion and layout are performed on the flat area and the curved - surface area; and a machining allowance of 100 mm is reserved on one side of the curved - surface area; preferably, the flat area is trapezoidal.

[0043] Step S02: Make a processing sample box and a template for contrast detection; the processing sample box and the template are used to compare and detect the machining accuracy of the curved - surface plate members; check that the gap between the plate member and the sample box does not exceed 3 mm, and locally does not exceed 5 mm to ensure the accuracy of the plate member after processing.

[0044] Preferably, in step S02, a plurality of processing sample boxes and templates are provided, and their shapes respectively correspond to the shapes of each plate member in the curved surface area; wherein the processing sample boxes and templates are provided with the same processing allowance corresponding to the processing allowance reserved in step S01.

[0045] Step S03: Fabricate the plate members of the outer plate structure, and compare and detect the shapes of the plate members in the curved surface area with the processing sample boxes and templates; after passing the detection, cut and process the plate members according to the processing allowance reserved on the processing sample boxes; avoid cutting the allowance in the high-altitude state during the overall assembly process to improve the cutting efficiency.

[0046] Step S04: Draw the ground sample lines of the top circle and the bottom square on the fabrication site, mark the center of the circle and make center punch marks, and fabricate the overall installation jig according to the circular ground sample line.

[0047] Preferably, in step S04, the overall installation jig further includes using a circular pipe with a diameter of 310 mm, adding a 20-mm-thick backing plate at the top of the circular pipe as a support, and setting the height of the jig to 700 mm, and evenly arranging 16 - 32 along the circular opening of the round sky and square earth; preferably, in step S04, it further includes marking the circular opening contour line on the jig, and the radius of the drawn installation line is 5 mm larger than the radius of the original circular opening contour line, and making center punch marks to avoid not being able to find it during the construction process.

[0048] Step S05: Perform reverse-state assembly from the top circle to the bottom square according to the jig, the top circular ground sample line and the bottom square ground sample line.

[0049] Preferably, in step S05, the reverse-state assembly includes the following steps:

[0050] Step S51: Fix and install the top circular opening plate member, and make the top circle coincide with the circular ground sample line, hang plumb lines at the four corners of the bottom square and make them coincide with the corner cross ground sample lines and ensure that the four sides of the square are straight; specifically, use a plumb line to make the positions of the four corners of the bottom square of the round sky and square earth steel structure coincide with the corresponding cross ground sample lines, so as to ensure the precision dimensions of the square opening.

[0051] Step S52: Fix and install the circular opening T-section 4 at the top circular opening position, and carry out support and strengthening inside the circular opening T-section 4.

[0052] Step S53: Hoist the plate members in the plane area in sequence, and use a plumb bob to adjust the center of the plane plate member and align the center line and contour line of the ground sample line at the center and both ends, so as to determine that the positioning of the plane plate member is accurate.

[0053] Step S54: Finally, install the outer plates at the four corner positions respectively.

[0054] In this embodiment, the outer plate of the corner area includes a first corner plate member 11, a second corner plate member 12, and a third corner plate member 13; the round opening plate member includes a first round opening plate member 21 and a second round opening plate member 22;

[0055] Since the first round opening plate member 21, the second round opening plate member 22, and the flat area plate member have been positioned, when installing the first corner plate member 11, the second corner plate member 12, and the third corner plate member 13 at the corner position, it is only necessary to butt and align them with the first round opening plate member 21, the second round opening plate member 22, and the flat area plate member;

[0056] Among them, the first corner plate member 11, the second corner plate member 12, and the third corner plate member 13 all have an arc-shaped integral plate structure, which can avoid the plate weld seam at the corner center line, not only facilitating the improvement of the plate utilization rate and reducing the processing difficulty, but also avoiding stress concentration caused by the concentration of plate seams at the corner endpoints;

[0057] Preferably, when manufacturing the plate member of the flat area in step S53, by pre-manufacturing the plate member of the flat area on the ground, the support structure of the flat area sheet can also be installed on the plate member of the flat area in advance and welded. This reduces the bulk during overall assembly and the welding difficulty, thereby improving the manufacturing efficiency; prefabricating the outer plate of the flat area and the internal components into a component on a flat site reduces the bulk parts of the overall component;

[0058] In step S05, an inverted state assembly crane base load-bearing structure is adopted, which not only facilitates the hoisting of the structure, but also plays a role in facilitating positioning and installation, thereby improving the construction efficiency and avoiding the overhead installation and overhead welding caused by the normal state manufacturing of the plate member.

[0059] Step S06: Install the internal support and reinforcement structure;

[0060] Preferably, in step S06, preferably, in step S06, the first vertical support member 31, the second vertical support member 32, and the T-shaped section 33 at the middle position are welded and fixed.

[0061] Step S07: Install support members inside the top circular and bottom direction openings;

[0062] Preferably, in step S07, a first support pipe 5 in a cross shape is arranged at the top circular opening, and a second support pipe 6 in a grid shape is arranged at the bottom square opening for support and reinforcement.

[0063] Step S08: Finally, arrange an even number of welders to perform overall welding; this also includes symmetrically welding the corner joints of the internal structure and the outer plate. During the welding process, it is necessary to detect the accuracy of the upper and lower end circular and square openings at any time, and adjust the welding position immediately if there is an edge difference.

[0064] The technical effects of the present invention are mainly reflected as follows: Compared with the prior art, the present invention first manufactures a processing sample box and a template corresponding to the shape of the plate member, and reserves corresponding machining allowances on the processing sample box and the template, so as to facilitate the shape detection and machining of the manufactured plate member and the setting of the machining allowance, thereby achieving higher precision compared with the prior art; By using a jig, a top circular ground line and a bottom square ground line, and performing reverse-state assembly from the top circular to the bottom square direction, it not only facilitates the hoisting of components and improves the assembly efficiency, but also plays a role in facilitating positioning and installation, thereby improving the construction efficiency, and avoiding the overhead installation and overhead welding caused by the normal-state production of the plate member, which is more convenient for welding construction; Moreover, the diameter control error of the manufactured top circle is controlled within ±5 mm, and the side length and diagonal of the bottom square are controlled within ±5 mm, effectively ensuring the assembly and docking accuracy between the round-top and square-bottom steel structure and other components.

[0065] Of course, the above are only typical examples of the present invention. In addition, the present invention can also have many other specific implementation manners. Any technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. An assembly method for the structure of the circular-to-square base of a large crane, characterized in that, It includes the following steps: Step S01: Divide the plates of the outer plate structure into flat areas and curved surface areas, and perform horizontal lofting development and layout; the curved surface areas include several top circular orifice plates and corner plates; Step S02: Manufacture a processing sample box and templates for contrast detection; Step S03: Manufacture the plates of the outer plate structure, and compare the shapes of the plates in the curved surface areas with the processing sample box and templates; after passing the detection, set the machining allowance; Step S04: Draw the ground sample lines of the top circle and the bottom square on the manufacturing site, mark the center of the circle and make center punch marks, and manufacture the overall installation jig according to the circular ground sample line; Step S05: Perform reverse assembly in the direction from the top circle to the bottom square according to the jig, the top circular ground sample line and the bottom square ground sample line; Step S06: Install the internal support and strengthening structure; Step S07: Install supports inside the openings at the top circle and the bottom; Step S08: Finally, arrange an even number of welders for overall welding; In Step S05, the reverse assembly includes the following steps: Step S51: Fix and install the top circular orifice plate, and make the top circle coincide with the circular ground sample line, hang vertical lines at the four corners of the bottom square to coincide with the corner point cross ground sample lines and ensure that the four sides of the square are straight; Step S52: Fix and install the T-shaped section at the circular orifice position of the top circular orifice, and perform support strengthening inside the T-shaped section at the circular orifice position; Step S53: Hoist the plates in the flat area in sequence, and use a plumb bob to adjust the center of the flat plate, the center line of the ground sample line and the contour line to be aligned, so as to determine the accurate positioning of the flat plate; Step S54: Finally, install the outer plates at the four corner positions respectively.

2. The assembling method of a large crane's round upper and square lower base structure according to claim 1, characterized in that, In Step S01, specifically, it includes dividing the plates of the outer plate structure into four flat areas and four curved surface areas of the corner parts along the tangent line, and performing horizontal lofting development and layout on the flat areas and the curved surface areas; and a machining allowance of 100 mm is reserved on one side of the curved surface area.

3. The assembly method of the large crane's round-to-square base structure according to claim 2, characterized in that, The flat area is trapezoidal.

4. The assembly method of the round-to-square base structure of a large crane as described in claim 1, characterized in that, In Step S02, several processing sample boxes and templates are provided, and their shapes correspond to the shapes of each plate in the curved surface area respectively; the processing sample boxes and templates are provided with machining allowances.

5. The assembling method of the large crane's round upper and square lower base structure according to claim 1, characterized in that, In Step S04, the overall installation jig also includes using a round pipe with a diameter of 310 mm, adding a 20-mm-thick backing plate at the top of the round pipe as a support, and setting the height of the jig to 700 mm, and arranging 32 evenly according to the round orifice of the round sky and square earth.

6. The assembling method of a large crane's round upper and square lower base structure according to claim 1, characterized in that In Step S04, it also includes marking the circular orifice contour line on the jig, and the radii of the marked installation lines are all 5 mm larger than the radius of the original circular orifice contour line, and making center punch marks.

7. The assembly method of the round-to-square base structure of a large crane as described in claim 6, characterized in that, When manufacturing the plates in the flat area in Step S53, by pre-manufacturing the plates in the flat area on the ground, the support structure of the flat area sheet is installed on the plates in the flat area in advance and welding is completed.

8. The assembling method of the round-to-square base structure of a large crane as described in claim 1, characterized in that, In Step S06, in Step S06, weld and fix the first vertical support, the second vertical support and the intermediate position T-shaped section.

9. The assembling method of the round-to-square base structure of a large crane according to claim 1, characterized in that, In step S07, a first support pipe in a cross shape is provided at the top circular opening, and a second support pipe in a grid shape is provided at the bottom square opening for support and reinforcement.

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