Method for adjusting torsional deformation of steel box girder

Abstract

The invention discloses a method for adjusting torsional deformation of a steel box girder, which comprises the step of connecting a closure section steel box girder and a completion section steel box girder, and comprises the following steps of: applying equivalent reverse thrust to a beam sheet of the closure section steel box girder, which is subjected to torsional deformation, by utilizing at least two telescopic assemblies arranged in opposite directions; and the beam pieces, subjected to torsional deformation, of the closure section steel box beam form torsional moment to adjust the generated torsional deformation. According to the method, the bottom elevation and the axis position of the closure section steel box girder are positioned, then the torsional deformation of the steel box girder is corrected by applying opposite and equivalent thrust in the torsion direction of the steel box girder through the multiple sets of telescopic assemblies, and the torsional deformation of the steel box girder is rapidly corrected by forming a torsional moment on the steel box girder; the correction construction operation is convenient, the construction difficulty is low, the correction construction efficiency can be effectively improved while the torsional deformation of the steel box girder is accurately and efficiently corrected and adjusted, and the correction construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering construction, in particular to a method for adjusting the torsional deformation of a steel box girder. Background Art

[0002] Steel box girders are a commonly used structural form in the construction of large-span bridges. During the process of closure of steel box girders, the beam sections of the steel box girders may be torsional deformed due to the influence of asymmetric loads or the influence of construction level. The torsional deformation of the steel box girders must be corrected, and the correction method of transmission has a limited range of correction. When the torsional deformation error that can be corrected is large, it is difficult to guarantee the quality of the correction and the requirements of the construction progress.

[0003] A Chinese invention patent document with publication number CN113073569A discloses a method for correcting the overall torsional deformation of a steel box girder bridge section, and its technical solution includes the following steps: a. determining the plane and elevation layout of the fixed support, placing the beam section, and determining the fixed end and the correction end; b. cutting the bridge deck and U-shaped ribs transversely from the midpoint of the first segment; c. cutting the web vertically and the weld between the web and the bottom plate longitudinally; d. constraining the fixed end, applying forced displacement to the correction end, observing the maximum spacing between the web and the bottom plate at the cutting position and whether the correction end support point is in contact with the fixed support, and repeating steps bd at the next segment until the correction end support point is in contact with the fixed support.

[0004] The technical solution disclosed in the above patent can correct the torsional deformation of large-span steel box girder bridges to reduce the residual strain caused by the deformation correction, but its correction method requires multiple cutting and welding of the steel box girder, and the correction process is relatively cumbersome and the construction is relatively troublesome. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a steel box girder torsional deformation adjustment method which can effectively reduce the correction difficulty and reduce the torsional deformation error of the steel box girder.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for adjusting the torsional deformation of a steel box girder, including the steps of connecting the steel box girder of the joint section with the steel box girder of the completed section, and using at least two telescopic components arranged in relative directions to apply equal reverse thrusts to the beam pieces of the steel box girder of the joint section that have undergone torsional deformation, so that the beam pieces of the steel box girder of the joint section that have undergone torsional deformation form a torsional torque to adjust the torsional deformation.

[0007] As an improvement to the above solution, follow these steps:

[0008] Step S1, installing a working platform at the beam end of the completed section steel box girder, preliminarily positioning the joint section steel box girder, hoisting the joint section steel box girder to a bottom surface higher than the design elevation, so that the axis of the joint section steel box girder is horizontal with the axis of the completed section steel box girder;

[0009] Step S2, moving the steel box girder of the joint section to the working platform, and limiting the bottom of the steel box girder of the joint section by the working platform;

[0010] Step S3, adjusting the torsional deformation of different beam pieces in sequence from one side of the joint section steel box girder to the other side of the joint section steel box girder, fixing other beam pieces that have not been adjusted during the adjustment, applying thrust to the beam pieces of the joint section steel box girder that have torsional deformation through the telescopic assembly, so that the beam pieces that have torsional deformation form torsional torque;

[0011] Step S4, after adjusting all the beam pieces of the steel box girder of the jointed section that have undergone torsional deformation according to step S3, the steel box girder of the jointed section is jointed and connected with the steel box girder of the completed section, and the working platform is removed after the jointing.

[0012] As an improvement of the above scheme: in the step S2, a plurality of limit bottom supports are fixedly arranged on the working platform, and the bottom of the steel box girder of the joint section is supported by the limit bottom supports to form a limit fit; a box girder fixing frame is also fixedly arranged on the working platform, and the box girder fixing frame is detachably connected to the steel box girder of the joint section and the steel box girder of the completed section to form a support fit.

[0013] As an improvement of the above solution: in step S2, the limiting bottom support is supported at the middle position of the bottom of each beam piece of the joint section steel box girder.

[0014] As an improvement of the above scheme: in step S3, when using the telescopic component to apply thrust to the beam piece of the steel box girder in the joint section that has undergone torsional deformation, a telescopic component is used at the diagonals on both sides of the opposite sides of the beam piece to apply thrusts of opposite directions and equal strength.

[0015] As an improvement of the above solution: the telescopic component is a hydraulic cylinder or a pneumatic cylinder.

[0016] The beneficial effects of the present invention are as follows: the present invention positions the completed section steel box girder and the joint section steel box girder by arranging a working platform and a box girder fixing frame, so that the axis of the joint section steel box girder and the completed section steel box girder are kept horizontal, the bottom elevation and axis position of the joint section steel box girder are positioned, and then the torsional deformation of the steel box girder is corrected by applying opposite and equal thrusts in the torsional direction of the steel box girder through multiple groups of telescopic components, and the torsional deformation of the steel box girder is quickly corrected by forming a torsional torque on the steel box girder; the correction construction of the present invention is convenient to operate and has a low construction difficulty. While accurately and efficiently correcting and adjusting the torsional deformation of the steel box girder, it can effectively improve the efficiency of the correction construction and reduce the cost of the correction construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the steel box girder of the completed section and the steel box girder of the closure section being closed and butted in the present invention;

[0018] Figure 2 The schematic diagram of the cross section of the steel box girder at the joint section before the torsional deformation adjustment is performed;

[0019] Figure 3 It is a schematic diagram of the cross section of the steel box girder in the joint section during the torsional deformation adjustment process.

[0020] Marked in the figure: 100-joined section steel box girder, 200-completed section steel box girder, 300-telescopic assembly, 310-first telescopic assembly, 320-second telescopic assembly, 330-third telescopic assembly, 340-fourth telescopic assembly, 350-fifth telescopic assembly, 360-sixth telescopic assembly, 370-seventh telescopic assembly, 380-eighth telescopic assembly, 400-working platform, 410-limiting base support, 420-box girder fixing frame. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0022] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down” and “inside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] like Figures 1 to 3 As shown, the torsional deformation adjustment method of the steel box girder disclosed in the present invention is used to correct and adjust the torsionally deformed steel box girder when the joint section steel box girder 100 and the completed section steel box girder 200 are connected during the steel box girder construction, so as to reduce the torsional deformation error of the steel box girder and ensure that the connection work of the joint section steel box girder 100 and the completed section steel box girder 200 can be carried out smoothly and accurately. When correcting the torsional deformation of the joint section steel box girder 100, the present invention uses a telescopic component 300 to apply a thrust in a specific direction to the joint section steel box girder 100 that has undergone torsional deformation, which is mainly reflected in applying a reverse thrust to the beam piece of the joint section steel box girder 100 that has undergone torsional deformation, acting in the diagonal direction of the torsional deformation of the beam piece, so that a moment is formed on the torsional deformation beam piece, thereby reducing the difficulty of correcting the torsional deformation and improving the correction accuracy of the torsional deformation.

[0024] Specifically, the method for adjusting the torsional deformation of a steel box girder disclosed in the present invention is carried out by correcting the construction according to the following steps:

[0025] Step S1: Figure 1 As shown, a working platform 400 is installed at the beam end of the completed section steel box girder 200 to preliminarily position the joint section steel box girder 100. The working platform 400 is mainly used to position and limit the bottom of the joint section steel box girder 100 to ensure that the bottom elevations of the joint section steel box girder 100 and the completed section steel box girder 200 remain unchanged during the correction process. After the installation of the working platform 400 is completed, the joint section steel box girder 100 is hoisted to a position close to the working platform 400, and the bottom surface of the joint section steel box girder 100 is preliminarily adjusted to be slightly higher than the design elevation, and the axis of the joint section steel box girder 100 is level with the axis of the completed section steel box girder 200.

[0026] Step S2, moving the joint section steel box girder 100 to the working platform 400, and limiting the bottom of the joint section steel box girder 100 through the working platform 400 to achieve positioning of the bottom elevation and axis position of the joint section steel box girder 100.

[0027] Specifically, in this step, the present invention limits the bottom of the joint section steel box girder 100 by setting a limiting bottom support 410 on the working platform 400; Figure 2 and Figure 3 As shown, a plurality of limiting bottom brackets 410 are fixed on the working platform 400, and the limiting bottom brackets 410 are fixed on the top surface of the working platform 400. The limiting bottom brackets 410 form support at the bottom of the joint section steel box girder 100 to achieve the limit of the bottom elevation of the joint section steel box girder 100. In order to improve the bottom limiting effect of the limiting bottom brackets 410 on the joint section steel box girder 100, the setting position of the limiting bottom brackets 410 can be made corresponding to the bottom center line of the joint section steel box girder 100, and a plurality of limiting bottom brackets 410 can be installed at the corresponding positions of the bottom center line of the joint section steel box girder 100 to form multi-point support and limit.

[0028] Further, such as Figure 2 and Figure 3As shown, the present invention also has a box girder fixing frame 420 fixedly installed on the working platform 400, and the box girder fixing frame 420 forms a limit for the joint section steel box girder 100 and the completed section steel box girder 200 from both sides and the top of the steel box girder, and the box girder fixing frame 420 can be connected with the joint section steel box girder 100 and the completed section steel box girder 200 in a detachable manner by fastener connection. By arranging the box girder fixing frame 420 on the working platform 400, the side and top surfaces of the joint section steel box girder 100 and the completed section steel box girder 200 are supported, and the fixing effect of the joint section steel box girder 100 and the completed section steel box girder 200 after positioning the joint section steel box girder 100 is further strengthened, providing a stable supporting foundation for subsequent correction work; while achieving the fixation of the joint section steel box girder 100 and the completed section steel box girder 200, it is also convenient to disassemble the box girder fixing frame 420 after the correction work is completed.

[0029] Step S3, using the telescopic assembly 300 to correct the beam piece of the steel box girder 100 that has undergone torsion deformation in the joint section; the telescopic assembly 300 can be a hydraulic cylinder or a pneumatic cylinder. Figure 2 and Figure 3 As shown, the correction work of the beam pieces of the steel box girder 100 of the joint section that have undergone torsional deformation is divided into sections. During the correction and adjustment, the two groups of beam pieces on the right side of the steel box girder 100 of the joint section can be fixed first, and then the beam piece on the left end of the steel box girder 100 of the joint section can be adjusted. Two groups of telescopic components 300 are used to apply reverse thrusts at two diagonal points of the beam pieces in the torsional deformation direction of the beam pieces. The reverse thrusts applied by the two groups of telescopic components 300 are equal in strength and opposite in direction, so that a torsional torque can be formed on the beam pieces, causing the beam pieces to rotate in the opposite direction of the torsional deformation direction. While correcting, the limiting base 410 supported at the bottom of the steel box girder 100 of the joint section can play a role of limiting and supporting, ensuring that the elevation and axis of the steel box girder 100 of the joint section do not change during the correction process of torsional deformation. If the reverse thrust applied by two groups of telescopic components 300 is not sufficient to reach the torque required for correction, the number of telescopic components 300 can be increased, and equal reverse thrusts can be applied by other two groups of telescopic components 300 at other positions of the beam piece to form another set of torsional torque on the beam piece to achieve auxiliary correction, thereby enabling the torsional deformation of the steel box girder 100 in the joint section to be smoothly adjusted.

[0030] like Figure 2Taking the correction process shown in the figure as an example, in this figure, the beam piece of the steel box girder 100 of the joint section is twisted to the left, then during the correction, the third telescopic assembly 330 and the seventh telescopic assembly 370 are first used to apply equal reverse thrusts in the two diagonal directions of the beam piece, and the beam piece forms a first set of torsional moments, which prompts the beam piece to rotate in the opposite direction relative to the torsional deformation, that is, to rotate to the right; if the thrust applied by the third telescopic assembly 330 and the seventh telescopic assembly 370 is not enough to meet the torsional moment, the second telescopic assembly 320 and the fifth telescopic assembly 350 can be added to apply equal reverse thrusts in different directions to form a second set of torsional moments on the beam piece. If the beam piece of the steel box girder 100 of the joint section is twisted to the right, then correspondingly, the first telescopic assembly 310, the sixth telescopic assembly 360, the fourth telescopic assembly 340 and the eighth telescopic assembly 380 cooperate to apply a torsional moment to the beam piece, prompting the beam piece to rotate to the left.

[0031] Step S4, after correcting and adjusting the beam piece on the left side of the joint section steel box girder 100, correct and adjust the beam pieces of the other two partitions according to the content of step S4, and after adjusting all the beam pieces that have torsional deformation of the joint section steel box girder 100 according to step S3, the joint section steel box girder 100 is connected with the completed section steel box girder 200, and the working platform 400 is removed after the joint.

Claims

1. A method for adjusting torsional deformation of a steel box girder, comprising the step of connecting a joint section steel box girder (100) with a completed section steel box girder (200), characterized in that: At least two telescopic components (300) arranged in opposite directions are used to apply an equal reverse thrust to the beam pieces of the joint section steel box girder (100) that have undergone torsional deformation, so that the beam pieces of the joint section steel box girder (100) that have undergone torsional deformation form a torsional moment to adjust the generated torsional deformation.

2. The method for adjusting the torsional deformation of a steel box beam according to claim 1, characterized in that: Follow these steps: Step S1, installing a work platform (400) at the beam end of the completed section steel box girder (200), preliminarily positioning the joint section steel box girder (100), hoisting the joint section steel box girder (100) to a bottom surface higher than the design elevation, so that the axis of the joint section steel box girder (100) is horizontal with the axis of the completed section steel box girder (200); Step S2, moving the joint section steel box girder (100) to the working platform (400), and limiting the bottom of the joint section steel box girder (100) through the working platform (400); Step S3, adjusting the torsional deformation of different beam pieces in sequence from one side of the joint section steel box girder (100) to the other side of the joint section steel box girder (100), fixing other beam pieces that have not been adjusted during the adjustment, applying thrust to the beam pieces of the joint section steel box girder (100) that have undergone torsional deformation through the telescopic assembly (300), so that the beam pieces that have undergone torsional deformation form a torsional moment; Step S4, after adjusting all the beam pieces of the steel box girder (100) that have undergone torsional deformation according to step S3, the steel box girder (100) of the jointed section is jointed and connected with the steel box girder (200) of the completed section, and the working platform (400) is removed after the jointing.

3. The method for adjusting the torsional deformation of a steel box beam according to claim 2, characterized in that: In the step S2, a plurality of limiting bottom supports (410) are fixedly arranged on the working platform (400), and the bottom of the joint section steel box girder (100) is supported by the limiting bottom supports (410) to form a limiting fit; a box girder fixing frame (420) is also fixedly arranged on the working platform (400), and the box girder fixing frame (420) is detachably connected to the joint section steel box girder (100) and the completed section steel box girder (200) to form a supporting fit.

4. The method for adjusting the torsional deformation of a steel box beam according to claim 3, characterized in that: In the step S2, the limiting base (410) is supported at the middle position of the bottom of each beam piece of the joint section steel box girder (100).

5. The method for adjusting the torsional deformation of a steel box beam according to claim 2, characterized in that: In step S3, when a telescopic assembly (300) is used to apply thrust to the beam piece of the joint section steel box girder (100) that has undergone torsional deformation, a telescopic assembly (300) is used at the diagonal positions on opposite sides of the beam piece to apply thrusts of opposite directions and equal strength.

6. The method for adjusting torsional deformation of a steel box beam according to claim 2, characterized in that: The telescopic assembly (300) is a hydraulic cylinder or a pneumatic cylinder.

Images