CN112296584B - Anti-deformation jig frame for welded steel box girder bridge deck plate and anti-deformation regulating quantity calculation method - Google Patents
Anti-deformation jig frame for welded steel box girder bridge deck plate and anti-deformation regulating quantity calculation method Download PDFInfo
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- CN112296584B CN112296584B CN202011446093.2A CN202011446093A CN112296584B CN 112296584 B CN112296584 B CN 112296584B CN 202011446093 A CN202011446093 A CN 202011446093A CN 112296584 B CN112296584 B CN 112296584B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G06F30/15—Vehicle, aircraft or watercraft design
Abstract
A welded steel box girder bridge deck plate anti-deformation jig frame is arranged on a welding platform and comprises a telescopic mechanism formed by cross-hinging a row of anti-deformation plates A arranged in parallel and a row of anti-deformation plates B arranged in parallel, and further comprises a fixed chute and a movable chute which are used for limiting the telescopic freedom degree of the telescopic mechanism in a certain direction; the reverse deformation plate A and the reverse deformation plate B have the same reverse deformation arc-shaped surface. The anti-deformation jig frame is universal and can adjust the anti-deformation amount, the anti-deformation surfaces with different chord arc heights under the same chord length can be obtained, and the projection curve of the anti-deformation surface meets the curvature requirement of an expected anti-deformation curve, so that the deformation amount is reduced; the telescopic mechanism increases the bearing capacity and the contact density of the target welding component, and the reverse deformation shape of the target welding component is more in accordance with the expectation. The method for calculating the anti-deformation regulating variable can quickly calculate the anti-deformation regulating variable through a formula, greatly improve the qualification rate of one-time welding inspection, and reduce the workload of subsequent correction.
Description
Technical Field
The invention belongs to the technical field of steel box girder manufacturing, relates to a welded steel box girder bridge panel anti-deformation jig frame, and further relates to a calculation method of anti-deformation adjustment quantity applied to the anti-deformation jig frame.
Background
In the manufacturing process of the steel box girder, a plurality of I ribs or U ribs are welded on the bridge deck. Because the single-side welding is adopted, the deformation of the welded bridge deck slab member is large, and the arc-shaped arch of the bridge deck is caused, the bridge deck slab member needs to be placed on a predeformation tool in advance for predeformation, and welding is carried out to reduce the deformation. The welding of the I rib on the bridge deck slab is performed by the slotless angle seam welding, and factors influencing the welding deformation amount are many, wherein the influence of the plate thickness on the welding deformation amount is the largest. Generally, the thicker the bridge deck plate and the thinner the I rib plate, the smaller the deformation of the bridge deck plate member; conversely, the thinner the bridge deck and the thicker the I-rib, the greater the amount of deformation of the bridge deck members. Theoretically, when the thicknesses of the bridge deck and the I-rib are constant, the heat energy required for welding is relatively constant, and therefore the amount of reverse deformation can be controlled by the chord length and the chord arc height of the bridge deck member in contact with the arc-shaped surface of the reverse deformation plate.
However, in actual production, the fixed cambered surface reversible deformation plate has no universality, wherein one reason is that the design of the steel box girder is nonstandard, and the width and the thickness of the bridge deck are changed; similarly, the thickness and the distribution density of the I-shaped ribs are different, so that the obtained plate surface has more or less deformation, the deformation is small, the plate surface can be leveled by heating through a flame leveling machine, the deformation amount is large, secondary straightening is needed, and obviously, the labor and the time are wasted. Another reason is that the reverse deformation amount of the reverse deformation plate can not be determined through formula calculation, and other complicated influence factors exist. At present, a more feasible method is that before batch production, a test piece with a bridge deck member welding structure is manufactured by replacing reverse deformation plates with different arc-shaped surfaces, then a reverse deformation plate with the best deformation control is selected from the test piece, and the reverse deformation plate is used as a mother plate to be subjected to mass copying and then put into use. Obviously, the workload in the early stage of the method is very large, and a large amount of manpower and material resources are wasted.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a welding steel box girder bridge deck plate reverse deformation jig frame and a calculation method of reverse deformation adjustment quantity applied to the reverse deformation jig frame, and aims to provide a universal reverse deformation jig frame capable of adjusting the reverse deformation quantity, rapidly realize the adjustment of the reverse deformation quantity of welding components with different plate thicknesses, reduce welding deformation and reduce production cost.
In order to realize the purpose, the following technical scheme is adopted:
a welded steel box girder bridge deck plate anti-deformation jig frame is installed on a welding platform and comprises a telescopic mechanism, a fixed sliding chute and a movable sliding chute, wherein the telescopic mechanism is formed by cross hinging of a row of anti-deformation plates A arranged in parallel and a row of anti-deformation plates B arranged in parallel; the reverse deformation plate A and the reverse deformation plate B have the same reverse deformation arc-shaped surface.
According to the technical scheme, the limiting piece is arranged at the end, in the same direction, of the fixed sliding groove and the movable sliding groove, and the limiting piece is hinged to one end of the telescopic mechanism and used for limiting the telescopic freedom degree of the telescopic mechanism in the other direction.
Further improve technical scheme, anti-deformation board A with anti-deformation board B all is equipped with a plurality of hinge structures that correspond including both ends, and the interval between two adjacent hinge structures equals.
The technical scheme is further improved, the hinge structure of the anti-deformation plate A is a pin hole, and the hinge structure of the anti-deformation plate B is a pin shaft; and a corresponding avoidance notch is arranged at the hinged position of the reverse deformation plate A and the reverse deformation plate B.
Further improve technical scheme, welded platform is equipped with a plurality of parallel arrangement's T type groove, installs T type groove nut at T type inslot, fixed spout passes through bolt, T type groove nut and welded platform fixed connection, the activity spout passes through bolt, T type groove nut and welded platform sliding connection.
Further improve technical scheme, the both sides of anti-deformation arcwall face are equipped with the chamfer circle.
The technical scheme is further improved, and the anti-deformation arc-shaped surface is an arc surface.
A method for calculating an inverse deformation adjustment quantity comprises the following steps:
s1: provided with strings to be adjustedThe arc height is H, the radius of the arc surface of the anti-deformation plate A or the anti-deformation plate B is R, the distance between the arc surface of the anti-deformation plate A or the anti-deformation plate B and the upper and lower contact points of the target welding component is regarded as the chord length L of the arc surface, and the chord length L is represented by a formula: l =2 (2R H-H)0.5Obtaining the chord length L;
s2: and (3) if the distance between the two ends of the reverse deformation plate A or the reverse deformation plate B is D, the width of the bridge deck member is W, and the distance between the fixed sliding chute and the movable sliding chute is X, obtaining a formula according to the proportional relation of similar triangles: x = W × D/L, and the chord length L is substituted to obtain X.
Further improving the technical scheme, in S1, the formula is simplified as follows: l =2 (2R x H)0.5。
The invention relates to a universal anti-deformation jig frame capable of adjusting the anti-deformation amount, which can quickly adjust the anti-deformation amount of welding components with different plate thicknesses by calculating the anti-deformation adjustment amount. Compared with the background technology, the invention has the following beneficial effects:
1. the telescopic mechanism of the invention increases the bearing capacity and the contact density of the target welding member, so that the reversible deformation shape of the target welding member is more in line with the expectation;
2. according to the invention, through linkage telescopic deformation, reverse deformation surfaces with different chord arc heights under the same chord length can be obtained, so that the adjustment of the reverse deformation amount of welding members with different plate thicknesses becomes possible;
3. the projection curve of the reverse deformation surface is an elliptic curve, and the elliptic curve meets the curvature requirement of an expected reverse deformation curve, so that the integral deformation of the target welding component is reduced;
4. due to the accurate calculation and adjustment of the anti-deformation amount, the welding deformation amount of the target welding component is effectively reduced, the qualification rate of one-time welding inspection is greatly improved, and the workload of subsequent correction is reduced;
5. the invention greatly reduces the trial and error loss, saves a large amount of manpower and material resources and reduces the production cost;
6. the telescopic mechanism is universal, linked and easy to adjust, and a large number of different arc-shaped surface reversible deformation plates are not required to be manufactured, so that the production cost is further reduced, and the production efficiency is improved.
The invention is creative in using the telescopic mechanism on the anti-deformation jig frame, the idea of adjusting the anti-deformation amount is not easy to think, and the beneficial effect is obvious.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the anti-deformation plate a.
Fig. 3 is a schematic structural view of the anti-deformation plate B.
Fig. 4 is a schematic diagram of a projection curve of an anti-deformation surface.
Fig. 5 is a schematic view of the present invention in operation.
Fig. 6 is a right side view of fig. 5.
Fig. 7 is a schematic diagram in step S1.
Fig. 8 is a schematic diagram in step S2.
In the figure: 1. welding a platform; 2. a telescoping mechanism; 21. a reverse deformation plate A; 22. a reverse deformation plate B; 23. a reverse deformation plate C; 24. a reverse deformation plate D; 3. fixing the chute; 4. a movable chute; 5. a hold-down mechanism; 6. a bridge deck member.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
A reverse deformation jig frame for welding steel box girder bridge deck plates is arranged on a welding platform 1 as shown in figure 1, comprises a telescopic mechanism 2 formed by hinging a row of reverse deformation plates A21 arranged transversely in parallel and a row of reverse deformation plates B22 arranged transversely in parallel in a crossed mode, and further comprises a fixed sliding groove 3 and a movable sliding groove 4 which are used for limiting the telescopic freedom degree of the telescopic mechanism 2 in the longitudinal direction. Fixed chute 3 transversely is fixed in welding platform 1's lower part, and activity spout 4 is located welding platform 1's upper portion, and activity spout 4 and fixed chute 3 parallel arrangement. A plurality of T-shaped grooves which are arranged in parallel in the transverse direction are formed in the welding platform 1, T-shaped groove nuts are installed in the T-shaped grooves, the fixed sliding grooves 3 are fixedly connected with the welding platform 1 through bolts and the T-shaped groove nuts, and the movable sliding grooves 4 are connected with the welding platform 1 in a sliding mode through the bolts and the T-shaped groove nuts. The hinge structure at the upper end of the telescopic mechanism 2 slides in the movable sliding chute 4, and the hinge structure at the lower end slides in the fixed sliding chute 3. The telescopic mechanism 2, the fixed chute 3 and the movable chute 4 form a plane telescopic structure similar to a telescopic door, and when the movable chute 4 longitudinally translates up and down, the telescopic mechanism 2 transversely extends and retracts left and right. In order to further limit the expansion freedom degree of the expansion mechanism 2 in the transverse direction, the right ends of the fixed chute 3 and the movable chute 4 are provided with positioning pins, and the positioning pins are coaxially connected with the hinged parts at the right end of the expansion mechanism 2, so that the expansion mechanism 2 can only expand towards the left end.
As shown in fig. 2 to 3, the upward surfaces of the reverse deformation plate a21 and the reverse deformation plate B22 are provided with reverse deformation surfaces having the same arc-shaped surface, and the reverse deformation surfaces may be circular arc surfaces, elliptical arc surfaces, or arc surfaces having other shapes. The reverse deformation surface is used for contacting a target welding component, and because the reverse deformation plate A21 and the reverse deformation plate B22 are at a certain angle, in order to prevent edges on two sides of the reverse deformation surface from crushing the target welding component, chamfer circles are arranged on two sides of the reverse deformation arc surface. Five corresponding hinge structures including two ends are arranged on the reverse deformation plate A21 and the reverse deformation plate B22, and the distance between every two adjacent hinge structures is equal. Specifically, the hinge structure of the anti-deformation plate A21 is a pin hole, and the hinge structure of the anti-deformation plate B22 is a pin shaft. The hinge joint of the reverse deformation plate A21 and the reverse deformation plate B22 is provided with a corresponding avoidance notch which is used for preventing the interference generated when the reverse deformation plate A21 and the reverse deformation plate B22 rotate. In order to fill up the vacant portions at the left and right ends of the telescopic mechanism 2, as shown in fig. 1, the telescopic mechanism 2 further includes a reverse deformation plate C23 and a reverse deformation plate D24, the reverse deformation plate C23 is obtained by cutting off an excess half of the reverse deformation plate a21, the reverse deformation plate D24 is obtained by cutting off an excess half of the reverse deformation plate B22, and the cut end of the reverse deformation plate C23 is hinged to the cut end of the reverse deformation plate D24, so that the vacant portions are filled up, and the telescopic mechanism 2 having a substantially rectangular shape is formed.
The anti-deformation plate A21, the anti-deformation plate B22, the anti-deformation plate C23 and the anti-deformation plate D24 are hinged with one another in a net shape, and compared with the existing anti-deformation plates arranged at intervals, firstly, each anti-deformation plate can stand on the welding platform 1 without designing a supporting bottom plate; secondly, the bearing capacity of the target welding component is increased, and larger anti-deformation force can be borne; thirdly, the contact density of the target welding component is increased, so that the reverse deformation shape of the target welding component is more in line with the expectation; more importantly, the anti-deformation surface with different chord arc heights under the same chord length can be obtained. When the telescopic mechanism 2 is stretched and contracted in the transverse direction, the anti-deformation plate A21 and the anti-deformation plate B22 rotate in opposite rotation directions and the same rotation angle by taking the symmetry axis where the highest salient point is located as the center, and at the moment, the projection curves of the anti-deformation surfaces on the anti-deformation plate A21 and the anti-deformation plate B22 on the transverse end surface of the welding platform 1 are changed: as shown in fig. 4, the angle between the anti-deformation plate a21 and the anti-deformation plate B22 is α 1, the projection curve of the angle on the transverse end face of the welding platform 1 is i, when the telescopic mechanism 2 extends to the left, the angle between the anti-deformation plate a21 and the anti-deformation plate B22 increases from α 1 to α 2, the projection curve ii on the transverse end face of the welding platform 1 becomes steep, and the chord arc height H1 under the same chord length is larger. On the contrary, when the telescoping mechanism 2 contracts towards the right side, the included angle between the reverse deformation plate A21 and the reverse deformation plate B22 is reduced from alpha 2 to alpha 1, the projection curve I of the reverse deformation plate A21 on the transverse end face of the welding platform 1 becomes gentle, and the chord height H2 under the same chord length is smaller. The projection curves of the reverse deformation surfaces of the reverse deformation plate A21 and the reverse deformation plate B22 on the transverse end surface of the welding platform 1 are a section of elliptic curve on one end of a major semi-axis of an ellipse, the curvature of the elliptic curve on a convex point (major semi-axis) is larger, the curvature of the elliptic curve on two ends is smaller, the projection curve with the characteristics is beneficial to the reverse deformation of a target welding member, the target welding member needs larger reverse deformation amount on the convex point, and the required reverse deformation amount is smaller when the target welding member extends to two sides, so that the whole deformation amount of the obtained welding member is minimum. Based on the principle, the reverse deformation surfaces with different chord arc heights under the same chord length can be obtained by only adjusting the distance between the fixed chute 3 and the movable chute 4. For the decking members 6, the width of the decking members 6 corresponds to the chord length, and the chord arc height is the amount of reverse deformation that the decking members 6 are to control.
Still taking the reverse deformation welding of the bridge deck member 6 as an example, during operation, as shown in fig. 5-6, the reverse deformation amount is estimated according to the parameters of the bridge deck member 6, and the chord arc height of the telescopic mechanism 2 is adjusted to the position according to the width of the bridge deck member 6; then, the bridge deck member 6 (the rib I is spot-welded on the bridge deck in advance) is placed on the telescopic mechanism 2, so that the center line of the bridge deck member 6 is superposed with the connecting line of the highest salient points on the anti-deformation plate A21 and the anti-deformation plate B22; finally, the pressing heads of the pressing mechanism 5 are pressed on the upper and lower sides of the bridge deck member 6, and the bridge deck member 6 is preliminarily deformed and then welded.
After welding, the decking members 6 are placed on the platform to detect the warp. If the middle part of the bridge deck member 6 is arched, the backward deformation is over small, and the chord arc height of the telescopic mechanism 2 is correspondingly increased according to the height of the arch; if the middle part of the bridge deck member 6 is sunken, the backward deformation amount is over large, and the chord arc height of the telescopic mechanism 2 is correspondingly reduced according to the height of the sunken part. If the chord arc height of the telescopic mechanism 2 is adjusted by adopting an estimation method, the number of defective products is increased greatly, the subsequent correction workload is multiplied, and the adjustment amount is calculated quantitatively, so that the moving amount of the movable sliding groove 4 is obtained accurately. Therefore, the invention also discloses a method for calculating the inverse deformation regulating quantity, which comprises the following steps:
s1: as shown in fig. 7, let H, H =0.2m, R =40m, R = 78 m, R being the radius of the arc surface of the reverse deformation plate a21 (which is the same size as the reverse deformation plate a21 and the reverse deformation plate B22, and one of them is selected here), and H being the chord arc height required to be adjustedBecause the radius R of the arc surface is large and the curvature is gentle, the distance between the arc surface of the reverse deformation plate a21 and the upper and lower contact points of the bridge deck member 6 is regarded as the chord length L of the arc surface of the reverse deformation plate a21, and a formula can be obtained according to the pythagorean theorem: l =2 (2R H-H)0.5(ii) a Because the numerical value of H is too small and can be ignored, the original formula can be simplified into L =2 (2R H)0.5And substituting into the calculation to obtain L =8 m;
s2: as shown in fig. 8, assuming that the distance between both ends of the reverse deformation plate a21 or the reverse deformation plate B22 is D, D =12m, the width of the bridge deck member 6 is W, W =6m, and the distance between the fixed chute 3 and the movable chute 4 is X, then the following relationship is obtained according to the similar triangular proportional relationship: x = W × D/L, substituting L, and calculating to obtain X =9 m.
When the chord arc height H needs to be adjusted to 0.16m, the formula L =2 (2R × H) is substituted0.5Calculating to obtain L =7.2 m; and substituting the L into a formula X = W × D/L, and calculating to obtain X =10 m. Likewise, when the chord arc height H needs to be adjusted to 0.25m, the formula L =2 (2R × H) is substituted0.5Calculating to obtain L =8.94 m; and substituting the L into a formula X = W × D/L, and calculating to obtain X =8 m. From the above calculation, the calculation method can quickly calculate the moving amount of the movable chute 4 to obtain the required chord arc height. From the above calculation, it can be known that, when the chord arc height needs to be increased, the distance between the fixed chute 3 and the movable chute 4 becomes smaller, the telescopic length of the telescopic mechanism 2 in the transverse direction becomes longer, and the telescopic length in the longitudinal direction becomes shorter. This variation is advantageous for thinner decking members 6, where the thinner decking members 6 deform a greater amount and the required chord arc height is also greater. Conversely, when the required chord height decreases, the distance between the fixed chute 3 and the movable chute 4 becomes larger, the telescopic length of the telescopic mechanism 2 in the lateral direction becomes shorter, and the telescopic length in the longitudinal direction becomes longer. This variation is advantageous for thicker decking members 6, where the thicker decking members 6 are deformed less and the required chord arc height is also less. When the length of the telescoping mechanism 2 in the lateral direction is less than the length of the deck member 6, the lateral support length can be increased by increasing the number of hinges of the reverse deformation plate a21 and the reverse deformation plate B22. The reversible deformation plate in the embodiment has the length of 12 meters and can be wider than 10 metersThe bridge deck member 6 is subjected to reversible deformation preloading.
In summary, the invention is a universal reverse deformation jig frame capable of adjusting reverse deformation amount, and the adjustment of the reverse deformation amount of the welding component with different plate thicknesses can be quickly realized by calculating the reverse deformation adjustment amount.
The present invention is not described in detail in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a welding steel box girder bridge panel material anti-deformation bed-jig, installs on welded platform, characterized by: the anti-deformation mechanism comprises a telescopic mechanism formed by cross-hinging a row of anti-deformation plates A arranged in parallel and a row of anti-deformation plates B arranged in parallel, and further comprises a fixed sliding chute and a movable sliding chute; a limiting piece is arranged at the end of the fixed sliding chute, which is in the same direction as the movable sliding chute, and the limiting piece is hinged with one end of the telescopic mechanism and is used for limiting the telescopic freedom degree of the telescopic mechanism in the other direction; the reverse deformation plate A and the reverse deformation plate B are provided with the same reverse deformation arc-shaped surface, the reverse deformation plate A and the reverse deformation plate B are respectively provided with a plurality of corresponding hinge structures including two ends, and the distance between every two adjacent hinge structures is equal.
2. The reversible deformation jig frame for the welded steel box girder bridge deck plate as claimed in claim 1, which is characterized in that: the hinge structure of the anti-deformation plate A is a pin hole, and the hinge structure of the anti-deformation plate B is a pin shaft; and a corresponding avoidance notch is arranged at the hinged position of the reverse deformation plate A and the reverse deformation plate B.
3. The reversible deformation jig frame for the welded steel box girder bridge deck plate as claimed in claim 1, which is characterized in that: welding platform is equipped with a plurality of parallel arrangement's T type groove, installs T type groove nut at T type inslot, fixed spout passes through bolt, T type groove nut and welding platform fixed connection, the activity spout passes through bolt, T type groove nut and welding platform sliding connection.
4. The welded steel box girder bridge deck plate reversible deformation bed-jig of claim 1, characterized by: and chamfer circles are arranged on two sides of the anti-deformation arc-shaped surface.
5. The welded steel box girder bridge panel reversible deformation bed-jig of any one of claims 1 to 4, characterized by: the anti-deformation arc-shaped surface is an arc surface.
6. An inverse deformation adjustment amount calculation method applied to an inverse deformation jig according to claim 5, characterized in that: the method comprises the following steps:
s1: setting the chord arc height required to be adjusted as H, setting the radius of the arc surface of the anti-deformation plate A or the anti-deformation plate B as R, and regarding the distance between the arc surface of the anti-deformation plate A or the anti-deformation plate B and the upper and lower contact points of the target welding member as the chord length L of the arc surface, wherein the chord length L is defined by a formula: l =2 (2R H-H)0.5Obtaining the chord length L;
s2: and (3) if the distance between the two ends of the reverse deformation plate A or the reverse deformation plate B is D, the width of the bridge deck member is W, and the distance between the fixed sliding chute and the movable sliding chute is X, obtaining a formula according to the proportional relation of similar triangles: x = W × D/L, and the chord length L is substituted to obtain X.
7. The method of claim 6, wherein the step of calculating the inverse distortion adjustment amount comprises the steps of: in S1, the formula reduces to: l =2 (2R H)0.5。
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| CN113798637A (en) * | 2021-10-15 | 2021-12-17 | 中船黄埔文冲船舶有限公司 | Reverse deformation processing method of groove-shaped wall plate |
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| CN112296584A (en) | 2021-02-02 |
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