Splicing tool and splicing method for circular rib frame

Abstract

The invention provides a splicing tool and a splicing method for a circular rib framework, the splicing tool comprises a rigid platform and convex rails which are arranged on the rigid platform and are crossed in a star shape, and concave movable positioning pieces used for fixing arc-shaped sections are mounted at the two ends of the convex rails; and the distances between the concave movable positioning pieces and the central point are controlled to be consistent, so that the arc-shaped sections are spliced into a complete circular rib frame. The eye plate of the positioning and restraining assembly is welded to the inner side wall, close to the center point, of the arc-shaped section, the circular fixing disc is arranged at the center point, the eye plate is connected with the outer edge of the circular fixing disc through the telescopic tensioning rigging, and therefore the circle splicing precision of the circular rib frame is guaranteed, and the pulling, fixing and restraining effects are achieved. According to the splicing tool, the circular rib frame can be smoothly hoisted into the conical tank shell plate sheet body under the condition that the flatness and diameter data are well controllable, continuous innovation and breakthrough of the ship building technology are promoted, the production efficiency is promoted to be improved, and the quality of the product building precision is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a splicing tool and a splicing method of a circular rib frame. Background Art

[0002] The conical hull (tank) of a ship needs to be supported by an internal circular rib frame. The circular T-row rib frame structure splicing is carried out on the floor of the workshop, with manual surveying and marking of positioning points before laying the panels for assembly and splicing. Two people use a long steel ruler to check the diameter data of the circular T-row components to ensure that they meet the accuracy technical requirements before transferring to the next process. In the large assembly stage, after the inner and outer shells are spliced, two people use a long steel ruler and auxiliary magnets to complete the survey and marking of the rib frame installation lines and other internal structure installation lines, and then the dimensional data involved in the marking process of the entire conical tank body is reviewed and re-inspected. When the survey data meets the accuracy requirements, the ship's conical tank rib frame splicing operation plan is finally completed.

[0003] The technical solution for the splicing of the rib frame of the tapered tank of a ship is that the amount of loosely hoisted structures in the production operation steps is large and the assembly and splicing require the use of lifting equipment resources. The difficulty of the operators in surveying and marking the structural lines and welding operations increases and the production efficiency is low. The welding bending and deformation of the rib frame assembly causes the diameter size of the circular rib frame to fail to meet the technical requirements. In addition, there is no good constraint support in the circulation and transportation process of the rib frame. When the rib frame is hoisted to the shell plate assembly in the large assembly stage, its roundness bending deformation and diameter deviation increase the construction difficulty in the production operation, and the production and construction technology effect is also difficult to guarantee the overall accuracy of the tapered shell. Therefore, the original construction plan will cause the circular rib frame assembly technology to fail to meet the standards, will cause rework during the large assembly stage of the subsequent process, and will affect the production and construction cycle. Summary of the invention

[0004] The purpose of the present invention is to transform the original circular rib frame component manufacturing technology from a rough and simple operation mode to a lean production mode, and use splicing automation devices and auxiliary reinforcement tooling to control the accuracy data and prevent bending deformation in the group production process. According to the characteristics of the circular rib frame group stage assembly, automated equipment is added to replace the manual splicing and welding mode. In terms of accuracy control, the original manual ruler re-inspection data is transformed into an auxiliary reinforcement tooling to restrain the circular T-row panel diameter data unchanged. Small lifting ears and eye plates are added to the telescopic pull rod rigging tooling in the auxiliary material reinforcement tooling, focusing on solving the problem of rapid lifting of parts and components after lifting and transferring to the next process, promoting the smooth lifting of the circular rib frame into the conical tank shell plate body when the flatness and diameter data are well controlled, and finally realizing the new technical achievements of circular rib frame splicing and accuracy control, promoting continuous innovation and breakthroughs in shipbuilding technology, promoting production efficiency improvement, and ensuring the quality of product construction accuracy.

[0005] To achieve the above and other related purposes, the present invention provides a splicing tooling for a circular rib frame, and the splicing tooling includes:

[0006] A rigid platform, on the upper surface of which there are multiple convex tracks intersecting in a cross shape like a "rice character", and the multiple convex tracks intersect at the center point. Concave movable positioning members are installed at both ends of the convex tracks, and the concave movable positioning members can move along the length direction of the convex tracks;

[0007] The circular rib frame is composed of multiple arc segments spliced together. The concave movable positioning members are used to fix the arc segments. The length direction of the convex tracks coincides with the radial direction of the arc segments. By controlling the distances of each concave movable positioning member from the center point to be the same, the arc segments are spliced into a complete circular rib frame.

[0008] Optionally, the included angle between two adjacent convex tracks is 45°.

[0009] Optionally, it further includes a positioning and constraint assembly, and the positioning and constraint assembly includes an eye plate, a telescopic tensioning rigging and a circular fixing plate; the eye plate is welded to the inner side wall of the arc segment close to the center point, the circular fixing plate is arranged at the center point, and the outer edge of the eye plate is connected to the circular fixing plate through the telescopic tensioning rigging. By adjusting the length of the telescopic tensioning rigging, the curvature of the arc segment is finely adjusted to ensure the circular splicing accuracy of the circular rib frame.

[0010] Optionally, the circular rib frame includes 4 arc segments, and multiple eye plates are evenly distributed along the circumference of the circular rib frame.

[0011] Optionally, it further includes a central receiving and processing unit and a control unit. The central receiving and processing unit and the concave movable positioning members are both communicatively connected to the control unit. The central receiving and processing unit is located at the center point and is used to measure the relative distances of each concave movable positioning member from the center point, and the control unit is used to control the movement of each concave movable positioning member on the convex tracks.

[0012] The present invention also provides a splicing method using the above splicing tooling, including the following steps:

[0013] S1. After obtaining two outer ends P and Q by centering and surveying on the rigid platform and then popping a straight line, obtain point O as the center point by taking the distance from the outer end of the straight line PQ to the center. Place a laser theodolite at point O, and operate the theodolite button to rotate the lens to obtain points R, S, V, W, T, U in sequence. Pop straight lines for each of the three outer ends of RS, VW, TU as the center lines for laying and installing the cross-shaped convex tracks; the straight lines PQ, RS, VW, TU intersect in a cross shape like a "rice character";

[0014] S2. Lay convex tracks along the straight lines PQ, RS, VW, and TU on the rigid platform in sequence. The operator manipulates the laser theodolite with point O as the central reference point to scan the levels of the eight outer points P, U, S, V, Q, T, R, and W, and adjusts the height differences of each point to be in the same horizontal plane.

[0015] S3. Install the central receiving and processing unit at the center point. Lay and install concave movable positioning parts on the four convex tracks of PQ, TU, RS, and VW in sequence, and make the concave movable positioning parts perpendicular to the convex tracks in the vertical direction. The concave movable positioning parts have fixed backing plates for placing the arc segments. The distances from the fixed backing plates of each concave movable positioning part to the central receiving and processing unit and the center point O are equal. The operator manipulates the control unit to debug and operate the central receiving and processing unit. The eight concave movable positioning parts move forward and backward synchronously on the convex tracks in good condition.

[0016] Optionally, the following steps are further included:

[0017] S4. Input the middle diameter data in the sectional view of the circular rib frame into the control unit to determine the positioning coordinates of each concave movable positioning part.

[0018] S5. A single operator manipulates the control unit to control the eight concave movable positioning parts to move synchronously on the convex tracks to the specified positioning coordinates, so that the distances from the concave movable positioning parts to the center point O are all the radius r. The traveling crane hoisting equipment hoists the cut arc segments onto the fixed backing plates of the concave movable positioning parts for corresponding positioning spot welding, and installs the eye plates on the inner side walls of the assembled arc segments close to the center point.

[0019] S6. A single operator sets the circular fixed disk at the center point O. The eye plates are connected to the outer edge of the circular fixed disk through telescopic tensioning riggings. By adjusting the lengths of the telescopic tensioning riggings, the curvature of the arc segments is finely adjusted to ensure the circular splicing accuracy of the circular rib frame, and at the same time, it plays a role of tensioning and restraining before welding.

[0020] Optionally, the following steps are further included:

[0021] S7. Perform automated welding operations on both the front and back sides, connect the arc segments end to end. After welding is completed, a single operator uses steel wires and locks to penetrate and fix the upper eye plates of the telescopic tensioning riggings, and hoists them off the rigid platform and transfers them to the next process for operation.

[0022] As described above, the present invention provides a splicing tooling and a splicing method for a circular rib frame. The splicing tooling includes a rigid platform and convex tracks arranged in a cross shape like a Chinese character "mi" on the rigid platform. Concave movable positioning members for fixing arc segments are installed at both ends of the convex tracks. By controlling the distances of the concave movable positioning members from the center point to be the same, the arc segments are assembled into a complete circular rib frame. The splicing tooling further includes a positioning and constraint assembly. An eye plate is welded to the inner side wall of the arc segment close to the center point, a circular fixing plate is arranged at the center point, and the outer edge of the eye plate is connected to the circular fixing plate through a telescopic tensioning rigging. By adjusting the length of the telescopic tensioning rigging, the curvature of the arc segment is finely adjusted to ensure the circular splicing accuracy of the circular rib frame, and at the same time, a tensioning and constraint effect before welding is achieved.

[0023] The splicing tooling of the present invention is applied to the small assembly production operation of shipbuilding, transforming the original manufacturing technology of the circular rib frame from a rough and simple operation mode into a lean production mode. During the manufacturing process, precision data is controlled by each component and bending deformation is prevented, facilitating the smooth hoisting of the circular rib frame into the conical tank shell sheet under the condition that the flatness and diameter data of the circular rib frame are controllable, promoting continuous innovation and breakthrough of shipbuilding technology, improving production efficiency, and ensuring the product construction accuracy and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It shows a three-dimensional structural schematic diagram of the splicing tooling in Embodiment 1 of the present invention.

[0025] Figure 2 It shows a structural schematic diagram of the central receiving and processing unit and the concave movable positioning member in Embodiment 1 of the present invention.

[0026] Figure 3 It shows a structural schematic diagram of the control unit in Embodiment 1 of the present invention.

[0027] Figure 4 It shows a structural schematic diagram of the circular rib frame in Embodiment 1 of the present invention.

[0028] Figure 5 It shows a structural schematic diagram of the arc segment forming the circular rib frame in Embodiment 1 of the present invention.

[0029] Figure 6 It shows a structural schematic diagram of the center line of the laying and installation of the convex track in Embodiment 2 of the present invention.

[0030] Figure 7 It shows a positioning coordinate schematic diagram of the concave movable positioning member in Embodiment 2 of the present invention.

[0031] Figure 8 It shows a structural schematic diagram of the positioning and constraint assembly in the present invention.

[0032] Figure 9 It shows the installation schematic diagram of the positioning and restraining component in the present invention.

[0033] Figure 10 It shows the hoisting schematic diagram using a steel wire rope in the present invention.

[0034] Element number description

[0035] Rigid platform 20; convex track 30; concave movable positioning member 40; central receiving and processing unit 50; control unit 60; circular rib frame 70; eye plate 80; telescopic tensioning rigging 90; circular fixed disk 100; steel wire rope 110. Specific implementation mode

[0036] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0037] When detailing the embodiments of the present invention, for the convenience of description, the cross-sectional view showing the device structure will be locally enlarged in a non-general proportion, and the schematic diagram is only an example, and it should not limit the protection scope of the present invention here. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0038] For the convenience of description, spatial relationship terms such as "below", "beneath", "lower", "under", "above", "on" may be used herein to describe the relationship between one element or feature shown in the drawings and other elements or features. It will be understood that these spatial relationship terms are intended to encompass other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can also be one or more intervening layers. As used herein, "between... and..." means including the endpoint values.

[0039] In the context of the present application, the structure in which the first feature is "above" the second feature described may include an embodiment in which the first and second features are formed in direct contact, and may also include an embodiment in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0040] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the illustrations, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0041] In the present invention, a cross-shaped flexible track is laid on a rigid iron platform at the circular rib frame component group stage. A central receiving and processing unit is set at the center of the circle. Concave movable positioning members are respectively set in the circular radiation circle. The central receiving and processing unit is controlled by a control unit computer control system to install circular rib frames of different sizes. After the operator assembles the webs and panels of each component, a telescopic tensioning rigging is added to control and fix the circular diameter data. After the operator uses a laser rangefinder to measure the diameter to meet the precision technical requirements, automated welding operations are carried out. When circular rib frames of different specifications are completed with component assembly on the rigid iron platform tooling, they are lifted and transferred to the next process. The following is specifically introduced through embodiments.

[0042] Embodiment 1

[0043] As Figures 1 to 5 shown, this embodiment provides a splicing tooling for a circular rib frame. The splicing tooling includes:

[0044] A rigid platform 20, on the upper surface of which there are multiple convex tracks 30 intersecting in a cross shape. The multiple convex tracks 30 intersect at the center point, and the included angle between adjacent two convex tracks 30 is 45°. Concave movable positioning members 40 are installed at both ends of the convex track 30, and the concave movable positioning members 40 can move along the length direction of the convex track 30.

[0045] The circular rib frame 70 is spliced by a plurality of arc segments 10, for example, divided into four segments or more. The concave movable positioning member 40 is used to fix the arc segment 10. The length direction of the convex track 30 coincides with the radial direction of the arc segment 10. By controlling the distance between each concave movable positioning member 40 and the center point to be consistent, the arc segments are combined into a complete circular rib frame 70.

[0046] Further, the splicing tooling further includes a positioning and constraint component. Refer to Figure 8 , the positioning and constraint component includes an eye plate 80, a telescopic tensioning rigging 90, and a circular fixing disk 100. The eye plate 80 is welded to the inner side wall of the arc segment near the center point. The circular fixing disk 100 is set at the center point. The outer edge of the eye plate 80 is connected to the circular fixing disk 100 through the telescopic tensioning rigging 90. By adjusting the length of the telescopic tensioning rigging 90, the curvature of the arc segment is finely adjusted to ensure the circular splicing accuracy of the circular rib frame.

[0047] Further, the splicing tooling further includes a central receiving and processing unit 50 and a control unit 60. The central receiving and processing unit 50 and the concave movable positioning member 40 are both communicatively connected to the control unit 60. The central receiving and processing unit 50 is located at the center point. By means of the central receiving and processing unit 50, the relative distances between each concave movable positioning member 40 and the center point are measured. The control unit 60 is used to control the movement of each concave movable positioning member 40 on the convex track. The control unit 60 may be a computer.

[0048] Embodiment 2

[0049] Based on the splicing tooling in the above Embodiment 1, this embodiment provides a splicing method for a circular rib frame, including the following steps:

[0050] S1. As Figure 6 shown, after obtaining two outer ends P and Q by centering and surveying on the rigid platform 20 and popping a straight line, obtain point O as the center point by taking the midpoint outside the straight line PQ. Place the laser theodolite at point O, operate the theodolite button to open the angle ruler 90° with the straight line at the outer ends of PQ to obtain the outer end point R. Then, in turn, operate the control key to reverse the lens 180° to obtain the outer end point S, rotate the lens by 45° to obtain the outer end point V, reverse the lens 180° to obtain the outer end point W, rotate the lens by 90° to obtain the outer end point U, and reverse the lens 180° to obtain the outer end point T. Next, pop straight lines for each of the outer end points of RS, VW, and TU as the center lines for the laying and installation of the cross-shaped convex track 30; the straight lines PQ, RS, VW, and TU intersect in a cross shape;

[0051] S2. Lay the convex track 30 along the straight lines PQ, RS, VW, and TU on the rigid platform 20 in sequence. The operator operates the laser theodolite with point O as the central reference point to scan the levels of the eight outer end points P, U, S, V, Q, T, R, and W, and adjust the height differences of each point to be in the same horizontal plane. The operator uses auxiliary clamps and the rigid platform 20 tooling parts to perform fixed welding at an equal distance of 300 mm, and determine that the radius distance of the cross-shaped convex track 30 extending outward from the center O point is 10 meters, meeting the diameter distance after the splicing of the rib frame inside the conical tank body;

[0052] S3. Install the central receiving and processing unit 50 at the central point. Sequentially lay and install the concave movable positioning members 40 on the four convex tracks 30 of PQ, TU, RS, and VW, and make the concave movable positioning members 40 perpendicular to the convex tracks 30 in the vertical direction. The concave movable positioning members 40 have fixed backing plates for placing the arc segments. The radius r from the fixed backing plate of each concave movable positioning member 40 to the central receiving and processing unit 50 and the central point O is equal. Next, the operator controls the control unit 60 to debug and operate the central receiving and processing unit 5. The eight concave movable positioning members 40 move forward and backward synchronously on the convex tracks 30, and the operation condition is good.

[0053] S4. Input the middle diameter data in the cross-sectional view of the circular rib frame 70 into the control unit 60. As Figure 4 shown, G, C, and B represent circular rib frames 70 of different sizes. Determine the positioning coordinates of each concave movable positioning member 40 in Figure 7 . Taking the figure as an example: Point P = (0, -r), Point U = (+a, -b), Point S = (+r, 0), Point V = (+a, +b), Point Q = (0, +r), Point T = (-a, +b), Point R = (-r, 0), Point W = (-a, -b).

[0054] S5. A single operator controls the control unit 60 to move the eight concave movable positioning members 40 synchronously on the convex tracks 30 to the specified positioning coordinates, so that the distance between the concave movable positioning members 40 and the central point O is the radius r. Next, the hoisting equipment of the crane hoists the cut arc segments onto the fixed backing plates of the concave movable positioning members 40 for one-to-one positioning spot welding. Next, install the eye plates 80 on the inner side walls of the assembled arc segments close to the central point. The eye plates 80 are evenly arranged along the circumference of the circular rib frame. As an example, it can be eight points of P, U, S, V, Q, T, R, and W, or more. There is no excessive limitation here.

[0055] S6. As Figure 8 , Figure 9 shown, a single operator sets the circular fixed disk 100 at the central point O. The eye plates 80 are connected to the outer edge of the circular fixed disk 100 through the telescopic tensioning rigging 90. By adjusting the length of the telescopic tensioning rigging 90, finely adjust the curvature of the arc segment, ensure the circular assembly accuracy of the circular rib frame, and at the same time play a role of tensioning and restraining before welding.

[0056] S7. Perform automated welding operations on both the front and back sides. As Figure 10As shown in the figure, after welding is completed, a single operator uses a wire rope 110 and a locking device to penetrate and fix the upper eye plate of the telescopic tensioning rigging 90, and then hoists it away from the rigid platform 20 and transfers it to the next process for operation. Next, according to the same operation method, circular rib frames of different sizes are installed and fabricated in sequence to ensure that the splicing and welding, hoisting and transportation of the circular rib frame T-row of components in the sub-assembly stage, as well as the subsequent rapid hoisting accuracy data, can be controlled, and the flatness remains unchanged during construction operations.

[0057] The accuracy control requirements in the above steps are as follows:

[0058] A circular rib frame splicing device and accuracy control requirements:

[0059] 1) The horizontal accuracy control for laying the convex track 30 on the rigid platform 20 is ±1 mm;

[0060] 2) The gap between the concave mobile positioning member 40 and the convex track 30 is 0.5 - 1 mm to ensure that the concave mobile positioning member 40 walks and moves synchronously without jamming;

[0061] 3) The synchronous deviation value of the walking and moving of 8 concave mobile positioning members 40 is ±0.5 mm, and the fixation control of the fixed backing plate for the arc segment is ±1 mm;

[0062] 4) The assembly diameter control of the arc segment is ±2 mm, and the flatness control is ±4 mm;

[0063] 5) The telescopic operation accuracy of the telescopic tensioning rigging 90 is ±1 mm.

[0064] In summary, the present invention provides a splicing tooling and a splicing method for a circular rib frame. The splicing tooling includes a rigid platform and convex tracks arranged in a cross shape in the shape of a Chinese character 'Mi' on the rigid platform. Both ends of the convex tracks are provided with concave mobile positioning members for fixing the arc segment. By controlling the distances of each concave mobile positioning member from the center point to be the same, the arc segments are assembled into a complete circular rib frame. The splicing tooling further includes a positioning and constraint component, wherein an eye plate is welded to the inner side wall of the arc segment close to the center point, a circular fixed disk is arranged at the center point, and the outer edge of the eye plate and the circular fixed disk are connected by a telescopic tensioning rigging. By adjusting the length of the telescopic tensioning rigging, the curvature of the arc segment is finely adjusted to ensure the circular splicing accuracy of the circular rib frame, and at the same time, it plays a role of tensioning and constraining before welding.

[0065] The splicing tooling of the present invention is applied to the small assembly production operation of shipbuilding, transforming the original circular rib frame manufacturing technology from a rough and simple operation mode into a lean production mode. During the manufacturing process, precision data is controlled by each component and bending deformation is prevented, promoting the smooth hoisting of the circular rib frame into the conical tank shell sheet under the condition that the flatness and diameter data are controllable, promoting continuous innovation and breakthrough of shipbuilding technology, improving production efficiency, and ensuring the quality of product manufacturing accuracy.

[0066] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A circular rib frame splicing tool, characterized in that: The splicing tooling comprises: A rigid platform, wherein the upper surface of the rigid platform is provided with a plurality of convex tracks intersecting in a cross shape, the plurality of convex tracks intersecting at a center point, and concave movable positioning members are installed at both ends of the convex tracks, and the concave movable positioning members can move along the length direction of the convex tracks; The circular rib frame is composed of multiple arc segments. The concave movable positioning parts are used to fix the arc segments. The length direction of the convex track coincides with the radial direction of the arc segments. By controlling the distance between each concave movable positioning part and the center point to be consistent, the arc segments are spliced ​​into a complete circular rib frame.

2. The circular rib frame splicing tool according to claim 1, characterized in that: The included angle between two adjacent convex tracks is 45°.

3. The circular rib frame splicing tool according to claim 1, characterized in that: It also includes a positioning and restraining component, which includes an eye plate, a telescopic tensioning rigging and a circular fixed plate; the eye plate is welded to the inner wall of the arc segment close to the center point, and the circular fixed plate is arranged at the center point. The eye plate and the outer edge of the circular fixed plate are connected by the telescopic tensioning rigging. The curvature of the arc segment is finely adjusted by adjusting the length of the telescopic tensioning rigging to ensure the roundness of the circular rib frame.

4. The circular rib frame splicing tool according to claim 3 is characterized in that: The circular rib frame includes four arc segments, and a plurality of eye plates are evenly distributed along the circumference of the circular rib frame.

5. The circular rib frame splicing tool according to claim 1, characterized in that: It also includes a central receiving and processing unit and a control unit. The central receiving and processing unit and the concave movable positioning member are both communicatively connected to the control unit. The central receiving and processing unit is located at the center point and is used to measure the relative distance between each concave movable positioning member and the center point. The control unit is used to control the movement of each concave movable positioning member on the convex track.

6. A splicing method using the splicing tool according to any one of claims 1 to 5, characterized in that: The steps include: S1. After obtaining the two outer ends of P and Q through centering survey on a rigid platform, a straight line is popped out. In the distance division of the outer ends of the straight line PQ, point O is obtained as the center point. A laser theodolite is placed at point O. The theodolite button is operated to rotate the lens to obtain R, S, V, W, T, and U in sequence. A straight line is popped out for each of the three outer end points RS, VW, and TU as the center line for the installation of the M-shaped convex track; the straight lines PQ, RS, VW, and TU intersect in a M-shaped shape; S2. Lay convex tracks on the rigid platform along the straight lines PQ, RS, VW, and TU in sequence. The operator controls the laser theodolite to use point O as the central reference point, scan the horizontality of the eight points P, U, S, V, Q, T, R, and W at the outer ends, and adjust the height difference of each point to be in the same horizontal plane; S3. Install the central receiving and processing unit at the center point, and lay and install the concave movable positioning parts on the four convex tracks PQ, TU, RS, and VW in turn, and make the concave movable positioning parts perpendicular to the convex tracks in the vertical direction. The concave movable positioning parts have a fixed backing plate for placing arc segments. The distance from the fixed backing plate of each concave movable positioning part to the central receiving and processing unit and the center point O is equal. The operator controls the control unit to debug the central receiving and processing unit. The eight concave movable positioning parts extend forward and retract backward synchronously on the convex tracks, and the operation is in good condition.

7. The splicing method according to claim 5, characterized in that: The following steps are also included: S4, inputting the median diameter data in the cross-sectional view of the circular rib frame into the control unit to determine the positioning coordinates of each concave movable positioning member; S5. A single-person control control unit controls eight concave movable positioning parts to synchronously move to the specified positioning coordinates on the convex track, so that the distance between the concave movable positioning parts and the center point O is the radius r. The crane hoisting equipment hoists the number-cut arc segments into the fixed support plates of the concave movable positioning parts for one-to-one positioning spot welding, and installs the eye plate to the inner side wall of the assembled arc segment close to the center point. S6. A single person sets the circular fixing plate at the center point O. The eye plate is connected to the outer edge of the circular fixing plate by a telescopic tensioning rigging. The curvature of the arc segment is finely adjusted by adjusting the length of the telescopic tensioning rigging to ensure the roundness of the circular rib frame and to play a role in tightening and restraining before welding.

8. The splicing method according to claim 6, characterized in that: The following steps are also included: S7. Carry out automated welding operations on both sides to connect the arc segments end to end. After welding is completed, a single worker uses a wire rope and a lock to penetrate and fix the upper eye plate of the telescopic tensioning rigging, and then lifts it off the rigid platform and transfers it to the next process.

Images