Construction method for reducing welding shrinkage rate of waste heat furnace steel frame
By setting up temporary fixed steel plates before welding of boiler steel frames and adopting symmetric welding technology, the problem of shrinkage and deformation of steel frames during welding is solved, the welding quality and stability are improved, and the dimensional accuracy and durability of steel frames after welding is ensured. .
Patent Information
- Application Number
- CN202411396001.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2024-12-27
AI Technical Summary
During the welding process of boiler steel frames, due to factors such as environment, humidity and temperature, steel structural parts are prone to shrinkage and deformation, affecting structural stability and welding quality, resulting in a decrease in welding quality and durability.
Temporary fixed steel plates are installed before welding the steel frame, and symmetric welding process and anti-corrosion paint are used. Through welding positioning of temporary fixed steel plates and oblique braces, the position stability of the steel frame and the welding sequence are ensured to be consistent, and the shrinkage rate during welding is reduced.
It effectively reduces the shrinkage rate during welding, improves the welding quality and the geometric shape and dimensional accuracy of the steel frame, reduces deformation and displacement during welding, and enhances the stability and durability of welding.
Smart Images
Figure CN119187994A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a boiler steel frame welding method, in particular to a construction method for reducing the welding shrinkage rate of a garbage waste heat furnace steel frame, and belongs to the technical field of boiler installation. Background Art
[0002] Compared with traditional thermal power plants, waste power plants have a unique boiler working environment, and their boiler bodies are smaller and more compact. Steel frames have higher requirements in the boiler working environment, and the presence of highly corrosive flue gas during the waste combustion process places higher requirements on the sealing of steel frames. Therefore, for waste incineration power plants, welding is a more reasonable installation method for steel frames.
[0003] During the welding process of the boiler steel frame, the problem of weld shrinkage is usually encountered. During the welding process, due to the influence of the environment, humidity, temperature, etc., coupled with inadequate welding methods and preventive measures, the steel structure is very likely to shrink and other deformations; this shrinkage phenomenon may affect the structural stability and strength of the entire steel frame, and even cause cracks and defects, thereby reducing the welding quality and durability, directly affecting the construction quality of the power plant, and damaging the boiler body construction structure. Summary of the invention
[0004] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a construction method for reducing the welding shrinkage rate of the steel frame of a garbage waste heat furnace. Setting a temporary fixed steel plate before welding the steel frame weld can effectively reduce the shrinkage rate during welding and improve the welding quality.
[0005] The technical solution adopted by the present invention to solve the technical problem is: A construction method for reducing the welding shrinkage rate of a steel frame of a garbage waste heat furnace comprises the following steps: S1. Construction of combination platform Select a suitable site, place multiple steel frames horizontally on the ground to form a combined platform, and use a leveling instrument to calibrate it; S2. Place two or more main columns on the combined platform using a jib crane or a crane, and adjust the span between adjacent main columns using a fall chain; S3. Reserve a 5mm welding groove between the inner walls of adjacent main columns, and use a jib crane or crane to install the connecting beam between adjacent main columns; S4. The main column and the connecting beam are fixed and welded by temporary fixing steel plates to ensure that the main column and the connecting beam are positioned in the same way; S5. Welding and positioning of temporary diagonal braces of columns Place a temporary diagonal brace between the upper inner side of the main column and the combined platform, and fix it by welding; S6. Place ribs inside and outside the overlapping area between the main column and the combined platform, and weld the ribs to the combined platform to clamp the main column; S7. After completing the above steps, measure and calibrate using a steel tape measure and conduct an overall review; S8. After rechecking and verifying, the main columns and the connecting beams are welded one by one symmetrically in the front and back directions. The welding order is as follows: welding of the main column 1 at the head end and the two sides of the connecting beam, welding of the main body 1 at the tail end and the two sides of the connecting beam, welding of the main column 2 at the head end and the two sides of the connecting beam, welding of the main body 2 at the tail end and the two sides of the connecting beam, and welding of the main column and the two sides of the connecting beam at the middle end; S9. After completing the above steps, use a cutting machine to cut off the temporary fixing steel plate and apply anti-corrosion paint on the weld; S10. After completing the welding of the main column and the connecting beam groove, grind the weld, then weld the upper and lower bottom plates to the center of the connecting beam weld respectively, and finally apply anti-corrosion paint; S11. After completing the above steps, measure and verify with a steel tape measure to determine the size of the steel frame after welding; finally, remove the temporary diagonal braces of the main column and the inner and outer ribs of the main column.
[0006] There is at least one combined platform, and the combined platform is made of I-beams.
[0007] The temporary fixing steel plates are arranged at the upper end positions of the main column and the connecting beam and at the lower end positions of the main column and the connecting beam, and the temporary fixing steel plates are distributed in a diagonally symmetrical manner.
[0008] When performing the construction of step S8, two workers weld simultaneously from the welding points at both ends of the main column and the connecting beam, and the welding speed should be kept consistent.
[0009] The positive beneficial effects of the present invention are: 1. The present invention can effectively reduce the shrinkage rate during welding by setting a temporary fixed steel plate at the weld before welding the steel frame, ensure the stability of the steel frame position during welding, and help control the geometric shape and dimensional accuracy of the welded steel frame; it can reduce the deformation and displacement during the steel frame welding process, reduce the shrinkage rate of steel frame welding, and improve the welding quality.
[0010] 2. The present invention adopts an oblique angle symmetrical welding process before welding the steel frame, which reduces stress concentration of the welded joint, reduces deformation and shrinkage, and improves welding quality; it is beneficial to uniform heat dissipation during welding and reduces residual stress. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is a process flow chart of the present invention; Figure 2 It is a construction drawing of step S1 of the present invention; Figure 3It is a construction drawing of step S2 of the present invention; Figure 4 It is a construction drawing of step S3 of the present invention; Figure 5 It is a construction drawing of step S4 of the present invention; Figure 6 It is a construction drawing of step S5 of the present invention; Figure 7 It is a construction drawing of step S6 of the present invention; Among them: 1-combined platform, 2-main column, 3-connecting beam, 31-head end Ⅰ, 32-tail end Ⅰ, 33-head end Ⅱ, 34-tail end Ⅱ, 35-middle end, 4-temporary fixed steel plate, 5 temporary diagonal brace, 6-rib frame, 7-slide rail, 8-steel frame. DETAILED DESCRIPTION
[0012] The present invention will be further explained and illustrated below in conjunction with the accompanying drawings: For example, see Figure 1-Figure 7 A construction method for reducing the welding shrinkage rate of a steel frame of a garbage waste heat furnace comprises the following steps: S1. Construction of combination platform Select a suitable site, place multiple steel frame supports horizontally on the ground to form a combined platform 1, and use a level instrument to calibrate it; S2. Place two or more main columns 2 on the combined platform 1 by using a jib crane or a crane, and adjust the span between adjacent main columns 2 by using a fall chain; S3. Reserve a 5 mm welding groove between the inner walls of adjacent main columns 2, and use a jib crane or a crane to install a connecting beam 3 between adjacent main columns 2; S4, the main column 2 and the connecting beam 3 are fixed and welded by a temporary fixing steel plate 4, so that the main column 2 and the connecting beam 3 are positioned in the same manner; S5. Welding and positioning of temporary diagonal braces of columns A temporary diagonal brace 5 is placed between the upper inner side of the main column 2 and the assembly platform 1, and is fixed by welding; S6, placing rib plates 6 inside and outside the overlapping area between the main column 2 and the combined platform 1, and welding the rib plates 6 to the combined platform 1 to clamp the main column 2; S7. After completing the above steps, measure and calibrate using a steel tape measure and conduct an overall review; S8. After rechecking and verifying, the main column 2 and each connecting beam 3 are welded one by one symmetrically in the front and back directions. The welding order is as follows: welding of the main column at the head end 131 and the two sides of the connecting beam, welding of the main body at the tail end 132 and the two sides of the connecting beam, welding of the main column at the head end 233 and the two sides of the connecting beam, welding of the main body at the tail end 234 and the two sides of the connecting beam, and welding of the main column at the middle end 35 and the two sides of the connecting beam; S9. After completing the above steps, use a cutting machine to cut off the temporary fixing steel plate 4 and apply anti-corrosion paint on the weld; S10, after completing the welding of the main column and the connecting beam groove, grind the weld, then weld the upper and lower bottom plates 4 to the center of the connecting beam weld respectively, and finally apply anti-corrosion paint; S11. After completing the above steps, the size of the steel frame after welding is determined by measuring and verifying with a steel tape measure; finally, the temporary diagonal brace 5 of the main column and the inner and outer ribs 6 of the main column are removed.
[0013] In the above description, there is at least one combined platform 1, and the combined platform 1 is made of I-beams.
[0014] In the above description, the temporary fixing steel plates 4 are arranged at the upper end positions of the main column 2 and the connecting beam 3 or at the lower end positions of the main column 2 and the connecting beam 3, and the temporary fixing steel plates 4 are diagonally symmetrically distributed.
[0015] In the above description, when performing the construction of step S8, two workers weld simultaneously from the welding points at both ends of the main column 2 and the connecting beam 3, and the welding speed should be kept consistent.
[0016] The present invention can effectively reduce the shrinkage rate during welding by arranging a temporary fixing steel plate at the weld before welding the steel frame, ensure the stability of the steel frame position during welding, and be beneficial to controlling the geometric shape and dimensional accuracy of the welded steel frame; it can reduce the deformation and displacement during the steel frame welding process, reduce the shrinkage rate of steel frame welding, improve the welding quality, and is easy to use, simple to operate, and easy to promote.
[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A construction method for reducing the welding shrinkage rate of a steel frame of a garbage waste heat furnace, characterized in that: The steps include: S1. Construction of combination platform Select a suitable site, place multiple steel frame supports horizontally on the ground to form a combined platform (1), and use a leveling instrument to calibrate it; S2. Place two or more main columns (2) on the combined platform (1) using a jib crane or a crane, and adjust the span between adjacent main columns (2) using a fall chain; S3, leaving a 5 mm welding groove between the inner walls of adjacent main columns (2), and installing a connecting beam (3) between adjacent main columns (2) using a jib crane or a crane; S4, the main column (2) and the connecting beam (3) are fixedly welded by means of a temporary fixing steel plate (4) so that the main column (2) and the connecting beam (3) are positioned in the same manner; S5. Welding and positioning of temporary diagonal braces of columns A temporary diagonal brace (5) is placed between the upper inner portion of the main column (2) and the assembly platform (1), and is fixed by welding; S6, placing a rib plate (6) inside and outside the overlapping area between the main column (2) and the combined platform (1), and welding the rib plate (6) to the combined platform (1) to clamp the main column (2); S7. After completing the above steps, measure and calibrate using a steel tape measure and conduct an overall review; S8. After rechecking and verifying, the main column (2) and each connecting beam (3) are welded one by one symmetrically in the front and rear directions. The welding sequence is as follows: welding of the main column and the connecting beam on both sides at the head end 1 (31), welding of the main body and the connecting beam on both sides at the tail end 1 (32), welding of the main column and the connecting beam on both sides at the head end 2 (33), welding of the main body and the connecting beam on both sides at the tail end 2 (34), and welding of the main column and the connecting beam on both sides at the middle end (35); S9. After completing the above steps, the temporary fixing steel plate (4) is cut off by a cutting machine, and anti-corrosion paint is applied to the weld; S10, after the main column and the connecting beam groove are welded, the weld is polished, and then the upper and lower bottom plates (4) are respectively welded to the center of the connecting beam weld, and finally anti-corrosion paint is applied; S11. After completing the above steps, the size of the steel frame after welding is determined by measuring and verifying with a steel tape measure; finally, the temporary diagonal braces (5) of the main column and the ribs (6) on the inside and outside of the main column are removed.
2. A construction method for reducing the welding shrinkage rate of a steel frame of a garbage waste heat furnace according to claim 1, characterized in that: There is at least one combined platform (1), and the combined platform (1) is made of I-beams.
3. A construction method for reducing the welding shrinkage rate of a steel frame of a garbage waste heat furnace according to claim 1, characterized in that: The temporary fixing steel plates (4) are arranged at the upper end of the main column (2) and the connecting beam (3) or at the lower end of the main column (2) and the connecting beam (3), and the temporary fixing steel plates (4) are distributed in a diagonally symmetrical manner.
4. A construction method for reducing the welding shrinkage rate of a steel frame of a garbage waste heat furnace according to claim 1, characterized in that: During the construction of step S8, two workers simultaneously weld at the welding points at both ends of the main column (2) and the connecting beam (3), and the welding speed should be kept consistent.