Diaphragms for controlling welding shrinkage and cross slope accuracy and their manufacturing method

Abstract

Provided is a diaphragm and a manufacturing method thereof for controlling welding shrinkage and transverse slope accuracy, comprising the following steps: determining a diaphragm design structure and a process transverse slope starting point, wherein the height of the symmetric center line is H, taking the process transverse slope starting point as the origin, rotating the diaphragm design structure as a whole about the process transverse slope starting point by a slope of i%, intersecting the diaphragm top edge with the extended symmetric center line to obtain a diaphragm process structure, wherein the length of the diaphragm top edge extension line in the diaphragm process structure is △, and the length of the extended symmetric center line is h; compensating the corresponding top plate manufacturing width according to the △ value, wherein △≈H×i%; and the angle and height of the diaphragm end, the process transverse slope starting point position, and the diaphragm bottom edge are all unchanged according to the design theoretical value, and increasing the reserved process amount A according to the design theoretical value. The present invention solves the problem of poor assembly accuracy of plate units and difficult control of transverse slope accuracy of bridge decks caused by the overall welding deformation of large-width steel box girders.

Description

Technical Field

[0001] The invention belongs to the technical field of manufacturing transverse slope type diaphragms of steel box beams, and in particular relates to a diaphragm capable of controlling welding shrinkage and transverse slope accuracy and a manufacturing method thereof. Background Art

[0002] With the development of steel bridge manufacturing technology in my country, in order to meet the needs of transportation and save manufacturing costs, more and more cross-river and cross-sea bridges adopt steel box girder structures. Among them, the general cross-section steel box girder plate unit has fewer blocks, the number of penetration welds is small, and the welding deformation has basically no effect on the cross slope accuracy of the steel box girder bridge deck. Therefore, the cross diaphragm is made according to the theoretical size, and the cross slope accuracy of the steel box girder bridge deck can be controlled by ensuring the geometric size of the steel box girder structure assembly.

[0003] However, for large and wide steel box girder bridges, the number of steel box girder plate units is large, and the number of penetration welds is large. For example, the integral steel box girder used in the Yibin Lingang Highway-Railway Dual-Use Yangtze River Bridge has a beam height of 5m, a bridge deck width of 63.9m, and a bridge deck with a bidirectional 2% transverse slope; its top plate is divided into 26 plate units, and its bottom plate is divided into 23 plate units. The top and bottom plate units are first connected in width and then assembled. There are still nearly 30 butt welds, and the cross diaphragm welding deformation and residual stress are large. If the cross diaphragm is made according to the theoretical size, the welding deformation and the cross slope of the bridge deck are seriously out of tolerance. The most prominent problems are: (1) the butt welding of the steel box girder assembly plate unit produces upward deformation; (2) the welding of the steel box girder cross diaphragm unit causes the cross diaphragm U-rib notch spacing to shrink and deform seriously; therefore, the manufacturing quality of the steel box girder cross diaphragm cannot meet the requirements of the design and relevant specifications. In this regard, the following technical solutions are proposed. Summary of the invention

[0004] The technical problems solved by the present invention are as follows: providing a diaphragm for controlling welding shrinkage and transverse slope accuracy and a manufacturing method thereof, by presetting a process transverse slope that is rotated downward by i%, and utilizing the anti-deformation principle, to offset the upward deformation caused by the overall welding of the steel box girder; by increasing the reserved process quantity A to the design theoretical value of the spacing between the U rib notches of the diaphragm, the shrinkage deformation of the spacing between the U rib notches caused by the welding of the diaphragm unit can be reasonably absorbed; and the difficult problems of poor assembly accuracy of plate units and difficult control of the transverse slope accuracy of the bridge deck caused by the overall welding deformation of the large-width steel box girder can be solved.

[0005] The technical solution adopted by the present invention is a method for manufacturing a diaphragm with controlled welding shrinkage and transverse slope accuracy, comprising the following steps:

[0006] S001. Determine the design structure of the diaphragm according to the design dimensions, and determine the starting point of the process cross slope according to the number and position of the horizontal blocks of the bottom plate, where the height of the symmetrical center line of the diaphragm design structure is H;

[0007] S002. Taking the starting point of the process transverse slope as the origin, the partition design structure as a whole is rotated downward around the starting point of the process transverse slope by a slope of i%. The slope of i% is used to offset the upward deformation caused by the butt welding of the plate unit.

[0008] S003. Intersect the rotated top edge of the diaphragm with the extension line of the symmetry center to obtain a diaphragm process structure. The length of the extension line of the top edge of the diaphragm in the diaphragm process structure is △, and the length of the extension line of the symmetry center line in the diaphragm process structure is h.

[0009] S004. Compensate the manufacturing width of the corresponding top plate according to the △ value of the extension line of the top edge of the diaphragm, where △≈H×i%; and the angle and height of the end of the diaphragm, the starting position of the process cross slope, and the bottom edge of the diaphragm remain unchanged from the design theoretical values.

[0010] S005. Increase the reserved process quantity A according to the theoretical design value to make the U-rib notches of the transverse partition. The increased reserved process quantity A is used to offset the shrinkage deformation of the U-rib notch spacing caused by the welding of the partition unit.

[0011] In the above technical solution, preferably: in step S002, when the width of the steel box girder bridge deck is 50m-70m and the number of transverse blocks of the top plate or the bottom plate is 20-30, i=0.13.

[0012] In the above technical solution, preferably: in step S002, when the width of the steel box girder bridge deck is 40m-50m and the number of transverse blocks of the top plate or the bottom plate is 15-20, i=0.12.

[0013] In the above technical solution, preferably: in step S002, when the width of the steel box girder bridge deck is 25m-40m and the number of transverse blocks of the top plate or the bottom plate is 10-15, i=0.11.

[0014] In the above technical solution, preferably: in step S002, when the width of the steel box girder bridge deck is less than 25m and the number of transverse blocks of the top plate or the bottom plate is less than 10, i=0.

[0015] In the above technical solution, preferably: in step S005, the reserved process amount A is 0.2-0.5 mm.

[0016] It also includes a diaphragm for controlling welding shrinkage and transverse slope accuracy, which is manufactured by a diaphragm manufacturing method for controlling welding shrinkage and transverse slope accuracy. The design theoretical value of the height of the symmetry centerline of the diaphragm is H; taking the starting point of the process transverse slope as the origin, the diaphragm as a whole is rotated downward around the starting point of the process transverse slope with a slope of i%, and the length of the extension line of the top edge of the diaphragm obtained by the intersection of the top edge of the rotated diaphragm with the extension line of the symmetry center is △, and the length of the extension line of the symmetry center line obtained by extending the intersection is h, and △≈H×i%; the i% slope is equal to the upward deformation caused by the butt welding of the plate unit; wherein the end of the diaphragm, the starting position of the process transverse slope, and the bottom edge angle and height of the diaphragm are all design theoretical values; the U-rib notch spacing of the diaphragm is the design theoretical value plus the reserved process amount A; the reserved process amount A is equal to the shrinkage deformation of the U-rib notch spacing caused by the diaphragm unit welding.

[0017] The advantages of the present invention compared with the prior art are:

[0018] 1. The diaphragm process structure of the present invention effectively solves the problem of poor assembly accuracy of plate units and difficult control of cross slope accuracy of bridge deck caused by overall welding deformation of large-scale wide steel box girders, meets the demand for smooth drainage of steel box girder bridge decks, and improves the safety and service life of bridge structures.

[0019] 2. The present invention presets a process cross slope that rotates downward by i% and utilizes the anti-deformation principle to offset the upward deformation caused by the overall welding of the steel box girder; the present invention increases the reserved process quantity A to the design theoretical value of the spacing between the U-rib notches of the transverse bulkhead, thereby reasonably solving the shrinkage deformation problem of the spacing between the U-rib notches caused by the welding of the bulkhead units. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a process structure diagram of the diaphragm of the present invention;

[0021] Figure 2 The state diagram of step S001 of the method for making the present invention;

[0022] Figure 3 The state diagram of step S002 of the method for making the present invention;

[0023] Figure 4 The state diagram of step S003 of the method for making the present invention;

[0024] Figure 5 The state diagram of step S004 of the method for making the present invention;

[0025] Figure 6 The process flow chart of the manufacturing method of the present invention is as follows;

[0026] In the figure: 1- design structure of the partition, 2- starting point of the process cross slope, 3- symmetry center line, 4- top edge of the partition, 5- process structure of the partition, 401- extension line of the top edge of the partition, 301- extension line of the symmetry center line, 6- spacing of the U-rib notches of the partition. DETAILED DESCRIPTION

[0027] The following will be combined with the attached embodiment of the present invention Figure 1-6 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] (like Figure 6 The method for manufacturing a diaphragm for controlling welding shrinkage and transverse slope accuracy comprises the following steps:

[0029] (like Figure 2 ) Step S001, determine the diaphragm design structure 1 according to the design size, and determine the process cross slope starting point 2 according to the number and position of the bottom plate transverse blocks, wherein the height of the diaphragm design structure 1 at the symmetry center line 3 is H.

[0030] (like Figure 3 ) Step S002, taking the process transverse slope starting point 2 as the origin, the partition design structure 1 is rotated downward around the process transverse slope starting point 2 by a slope of i%; the i% slope is used to offset the upward deformation caused by the butt welding of the plate unit.

[0031] Embodiment 1: In step S002, when the width of the steel box girder bridge deck is 50m-70m and the number of transverse blocks of the top plate or the bottom plate is 20-30, i=0.13.

[0032] Embodiment 2: In step S002, when the width of the steel box girder bridge deck is 40m-50m and the number of transverse blocks of the top plate or the bottom plate is 15-20, i=0.12.

[0033] It should be noted that: when the width of the steel box girder bridge deck is 50m and the number of transverse blocks of the top plate or bottom plate is 20, i=0.13 or i=0.12.

[0034] Embodiment 3: In step S002, when the width of the steel box girder bridge deck is 25m to 40m and the number of transverse blocks of the top plate or the bottom plate is 10 to 15, i=0.11.

[0035] It should be noted that when the width of the steel box girder bridge deck is 40m and the number of transverse blocks of the top plate or bottom plate is 15, i=0.12 or i=0.11.

[0036] Embodiment 4: In step S002, when the width of the steel box girder bridge deck is less than 25m and the number of transverse blocks of the top plate or the bottom plate is less than 10, i=0.

[0037] It should be noted that: when the width of the steel box girder bridge deck is 25m and the number of transverse blocks of the top plate or bottom plate is 10, i=0.11 or i=0.

[0038] That is, Table 1: i value parameter table

[0039] Steel box girder deck width Number of horizontal blocks of top (bottom) plate i value 50m~70m 20～30 0.13 40m~50m 15～20 0.12 25m~40m 10～15 0.11 ＜25m ＜10 0

[0040] (like Figure 4 ) Step S003, extend the rotated top edge 4 of the diaphragm and the symmetry center line 3 to intersect to obtain a diaphragm process structure 5, wherein the length of the extension line 401 of the top edge of the diaphragm in the diaphragm process structure 5 is △, and the length of the extension line 301 of the symmetry center line in the diaphragm process structure 5 is h.

[0041] (like Figure 5 ) Step S004, according to the △ value of the extension line 401 of the top edge of the diaphragm, the manufacturing width of the top plate at the corresponding position is compensated, wherein △≈H×i%; that is, △ is the approximate value of the result of H×i%, and the angle and height of the end of the diaphragm, the starting point 2 of the process cross slope and the bottom edge of the diaphragm are unchanged from the design theoretical values ​​(combined with Figure 1 ).

[0042] (like Figure 1 ) Step S005, increase the reserved process quantity A according to the design theoretical value to make the U rib notches of the transverse partition. The increased reserved process quantity A is used to offset the shrinkage deformation of the U rib notch spacing caused by the welding of the partition unit.

[0043] In the above embodiment, further: in step S005, the reserved process amount A is 0.2-0.5 mm, preferably 0.3 mm.

[0044] (Combined Figure 1 ) also includes a method for manufacturing a diaphragm that controls welding shrinkage and transverse slope accuracy, which is manufactured by a diaphragm that controls welding shrinkage and transverse slope accuracy.

[0045] It should be noted that: Figure 1 The “assuming” in the table refers to the design theoretical value.

[0046] The design theoretical value of the height of the symmetrical center line 3 of the diaphragm is H.

[0047] Taking the starting point 2 of the process transverse slope as the origin, the diaphragm as a whole is rotated downward around the starting point 2 of the process transverse slope with a slope of i%. The length of the diaphragm top edge extension line 401 obtained by extending and intersecting the top edge 4 of the rotated diaphragm with the symmetry center line 3 is △, and the length of the symmetry center line extension line 301 obtained by extending and intersecting is h, and △≈H×i%; the i% slope is equal to the upward deformation caused by the butt welding of the plate unit.

[0048] Among them, the end of the diaphragm, the position of the starting point 2 of the process cross slope, and the angle and height of the bottom edge of the diaphragm are all design theoretical values; the U-rib groove spacing 6 of the diaphragm is the design theoretical value plus the reserved process quantity A; the reserved process quantity A is equal to the shrinkage deformation of the U-rib groove spacing caused by the welding of the diaphragm unit.

[0049] The working principle of the present invention is as follows: the present invention presets a process cross slope that rotates downward by i%, and utilizes the anti-deformation principle to offset the upward deformation caused by the overall welding of the steel box girder; the present invention increases the reserved process quantity A to the design theoretical value of the spacing between the U-rib notches of the transverse diaphragm, and reasonably resolves the shrinkage deformation problem of the spacing between the U-rib notches caused by the welding of the diaphragm units.

[0050] From the above description, it can be found that the cross-diaphragm process structure of the present invention effectively solves the problem of welding deformation during the overall assembly of large and wide steel box girders, which leads to poor assembly accuracy of plate units and difficult control of the cross slope accuracy of the bridge deck. It meets the needs of smooth drainage of steel box girder bridge decks and improves the safety and service life of bridge structures.

[0051] In summary, the diaphragm is the inner tube of the steel box girder and is one of the keys to controlling the welding deformation and geometric dimensions of the steel box girder segment. In view of the problem that the number of large-scale wide steel box girder plate unit blocks is large, the welding deformation and cross slope accuracy are difficult to control, the present invention uses the preset anti-deformation principle, through the preset process cross slope and welding shrinkage process, to transform the diaphragm design structure into a process structure, and control the welding deformation and cross slope accuracy of the steel box girder.

[0052] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for manufacturing a diaphragm with controlled welding shrinkage and transverse slope accuracy, characterized in that: The steps include: S001. Determine the design structure of the diaphragm according to the design dimensions (1), and determine the starting point of the process cross slope (2) according to the number and position of the transverse blocks of the bottom plate, wherein the height of the diaphragm design structure (1) at the symmetry center line (3) is H; S002. With the process transverse slope starting point (2) as the origin, the partition design structure (1) is rotated downward by a slope of i% around the process transverse slope starting point (2); the slope of i% is used to offset the upward deformation caused by the butt welding of the plate unit; S003, extending the rotated top edge (4) of the diaphragm and the symmetry center line (3) to intersect to obtain a diaphragm process structure (5), wherein the length of the extension line (401) of the top edge of the diaphragm in the diaphragm process structure (5) is △, and the length of the extension line (301) of the symmetry center line in the diaphragm process structure (5) is h; S004. Compensate the manufacturing width of the corresponding top plate according to the △ value of the extension line (401) of the top edge of the diaphragm, where △≈H×i%; and the angle and height of the end of the diaphragm, the starting point (2) of the process cross slope, and the bottom edge of the diaphragm remain unchanged from the design theoretical values; S005. The U-rib notch spacing (6) of the transverse partition is increased by a reserved process quantity A according to the design theoretical value to produce the U-rib notch of the transverse partition. The increased reserved process quantity A is used to offset the shrinkage deformation of the U-rib notch spacing caused by the welding of the partition unit.

2. The method for manufacturing a diaphragm with controlled welding shrinkage and transverse slope accuracy according to claim 1, characterized in that: In step S002, when the width of the steel box girder bridge deck is 50m-70m and the number of transverse blocks of the top plate or bottom plate is 20-30, i=0.

13.

3. The method for manufacturing a diaphragm with controlled welding shrinkage and transverse slope accuracy according to claim 1, characterized in that: In step S002, when the width of the steel box girder bridge deck is 40m-50m and the number of transverse blocks of the top plate or bottom plate is 15-20, i=0.

12.

4. The method for manufacturing a diaphragm with controlled welding shrinkage and transverse slope accuracy according to claim 1, characterized in that: In step S002, when the width of the steel box girder deck is 25m-40m and the number of transverse blocks of the top plate or bottom plate is 10-15, i=0.

11.

5. The method for manufacturing a diaphragm with controlled welding shrinkage and transverse slope accuracy according to claim 1, characterized in that: In step S002, when the width of the steel box girder deck is less than 25m and the number of transverse blocks of the top plate or bottom plate is less than 10, i=0.

6. The method for manufacturing a diaphragm with controlled welding shrinkage and transverse slope accuracy according to claim 1, characterized in that: In step S005, the reserved process amount A is 0.2-0.5 mm.

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