Non-straight arch rib segment assembly control method under small-rigidity support

Abstract

The invention discloses a non-straight arch rib section splicing control method under small-rigidity support in the field of bridge construction control. The method comprises the steps that S1, two control points are preset on the upper surface of each arch rib section; s2, acquiring the position information of the erected segments placed on the support through the actual measurement coordinates of the control points, comparing the position information with the unstressed manufactured line shape, and extracting a change included angle; s3, on the basis of a tangent assembling principle, calculating actual control parameters of the to-be-assembled segments according to the change included angles, namely theoretical installation elevations of the control points; s4, ensuring that the end of the upper surface of the to-be-assembled section and the upper surface of the erected section are located on the same plane by using matching pieces between the arch rib sections; and S5, the to-be-assembled segments are adjusted through the lifting points, so that the to-be-assembled segments rotate around the matching pieces under the synergistic effect of the matching pieces till the coordinates of the control points of the to-be-assembled segments reach the theoretical installation elevation. It can be seen that the influence of external construction loads and the front construction stage can be ignored, the reasonable installation position of the next construction component is simply and conveniently determined and splicing of the next construction component is achieved according to the stress-free manufacturing line shape of the structure, and therefore the splicing control precision of the flexible arch rib is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction control, and particularly relates to a non-flat arch rib segment assembly control method under small rigidity support. BACKGROUND

[0002] Flexible arch truss girder arch bridges are widely used due to their strong crossing capacity and beautiful appearance. The construction of such bridges is often carried out by using the construction method of first girder and then arch. After the main girder is closed, the flexible arch rib is assembled on the girder by setting up a support, and then the arch rib is lifted and closed. When the arch rib is assembled on site, the constructor is often required to ensure that different arch rib segments are assembled according to the tangent at the segment port position according to the unstressed state method. Precise assembly control is one of the key works to ensure the uniformity of the internal force of the arch rib structure, the construction quality and safety of the structure.

[0003] The existing arch rib assembly control method under small rigidity support is to simulate the construction process by using structural simulation analysis, and to calculate the installation alignment of the arch rib segment by positive assembly. Before the cable process starts, the main girder is in the form of a continuous beam to bear the weight of the assembly support and the arch rib, as well as various construction loads. As the assembly process proceeds, the deflection of the main girder will gradually increase, and at the same time, the assembly support itself will also deform under the action of the weight of the arch rib. At this time, the arch rib segment is assembled under the condition of small support rigidity. Therefore, in order to ensure that the arch rib after assembly meets the design alignment, the installation alignment needs to be corrected on the basis of the unstressed manufacturing alignment. However, the deformation of the structural system during the construction process has strong time-varying characteristics, and the length of the assembly support set randomly, which brings great difficulty to the simulation in the construction stage. In addition, the members on both sides of the anchor point of the arch rib segment are not parallel, which is different from the tangent assembly of straight components. At this time, the conventional auxiliary means such as laser leveling is not applicable.

[0004] In summary, for the assembly construction of the flexible arch rib segment, the conventional control means has the problems of poor precision, low practicability and complex application program, which is easy to cause the occurrence of assembly corner between the segments. As the number of arch rib segments increases, the installation error caused by the assembly corner is continuously accumulated, which not only makes the structural alignment after installation deviate from the design alignment, but also easily forms stress concentration at the corner position, which endangers the safety of the structure. Therefore, how to effectively realize the tangent assembly of the arch rib segment, and the control means is simple and easy to operate, is an engineering problem to be solved. SUMMARY

[0005] The present application aims to provide a non-flat arch rib segment assembly control method under small rigidity support to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: The application provides a non-flat arch rib segment assembling control method under small rigidity support, which comprises the following steps. S1: two control points 101 and 102 and 201 and 202 are preset on the upper surface of the arch rib segment; S2: the position information of the erected segment 1 placed on the support is obtained through the measured coordinates of the control points 101 and 102, the inclination change amount 6 is extracted by comparing with the theoretical stress-free manufacturing line 5; S3: the actual control parameter of the segment to be assembled, i.e. the theoretical installation elevation of the control point 202, is calculated according to the inclination change amount 6 based on the tangent assembling principle; S4: the end of the upper surface of the segment to be assembled is ensured to be in the same plane with the upper surface of the erected segment by using the matching part 3 between the arch rib segments; S5: the segment to be assembled 2 is adjusted by using the lifting point 4, so that it rotates around the matching part 3 under the cooperation of the matching part, and the coordinates of the control point 202 reach the theoretical installation elevation.

[0007] On the basis of the above technical scheme, the position information of the erected segment 1 placed on the support is obtained through the measured coordinates of the control points 101 and 102, the inclination change amount 6 is extracted by comparing with the stress-free manufacturing line 5, and the specific steps are as follows: The stress-free manufacturing line 5 of the erected segment is drawn in Auto CAD or other industrial drawing software, and the stress-free manufacturing line 5 is rigidly rotated according to the control points 101 and 102, so as to obtain the actual assembling line 1 of the erected segment; The actual assembling line 1 of the erected segment is compared with the stress-free manufacturing line 5, and the inclination change amount 6 is extracted, which is denoted as .

[0008] On the basis of the above technical scheme, the actual control parameter of the segment to be assembled, i.e. the actual installation elevation of the control point 202, is calculated according to the inclination change amount 6 based on the tangent assembling principle, and the specific steps are as follows: The initial height difference of the control points 102 and 202 in the stress-free manufacturing line 5 is denoted as h ; After the inclination of the erected segment changes, the height difference change amount of the control points 102 and 202 is denoted as .

[0009] On the basis of the above technical scheme, the end of the upper surface of the segment to be assembled is ensured to be in the same plane with the upper surface of the erected segment by using the matching part 3 between the arch rib segments, which is realized by adjusting the support 203, inserting the plug into the matching port reserved on the matching part 3, and fixing, so that the segment to be assembled 2 can rotate around the matching port.

[0010] On the basis of the above technical solutions, the segment to be assembled 2 is adjusted by the lifting point 4, and is rotated around the matching part 3 under the cooperation of the matching part, until the coordinates of the control point 202 reach the theoretical installation elevation, and the specific steps are as follows: The posture of the segment to be assembled 2 is adjusted by the lifting machine at the lifting point 4, and the segment to be assembled 2 is rigidly rotated around the matching part 3. The target height difference of the control points 102 and 202 is used as a criterion, and when the target height difference is reached, it is considered that the segment to be assembled 2 has reached the theoretical installation elevation.

[0011] Compared with the prior art, the beneficial effects of the present application are as follows: 1. The present application can ignore the influence of external construction load, support structure deformation and the influence of the pre-construction stage, and the reasonable installation position of the next construction component can be determined and the tangent assembly can be realized according to the on-site measurement and the stress-free manufacturing line of the arch rib segment, so that the assembly control precision of the flexible arch rib is effectively improved. 2. The application mode of the present application is simple, the installation elevation of the segment can be determined by measuring the relative height difference once, without the need for simulation analysis of the construction process of the structure, and without the need for other instruments, the efficiency of the flexible arch rib assembly is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 A flowchart of a small-rigidity support non-flat arch rib segment assembly control method provided by the embodiment of the present application; Figure 2 A schematic diagram of the engineering application in the embodiment of the present application.

[0014] In the figure, 1 is an erected arch rib segment, 2 is a segment to be assembled, 3 is a matching part, 4 is a lifting point, 5 is a theoretical stress-free manufacturing line, 6 is an inclination change amount, 101 and 102 are preset control points of the erected arch rib segment, 103 is an assembly support of the erected arch rib segment, 201 and 202 are preset control points of the segment to be assembled, and 203 is an assembly support of the segment to be assembled. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] Figure 1 FIG. 1 is a flow chart of a method for controlling the assembly of non-straight arch rib segments under low-rigidity supports according to an embodiment of the present invention. Figure 1 As shown, the present invention provides a method for controlling the assembly of non-straight arch rib segments under low-rigidity supports, comprising the following steps: S1: two control points 101 and 102, and 201 and 202 are preset on the upper surface of the arch rib segment; S2: Obtain the position information of the mounted segment 1 placed on the support through the measured coordinates of the control points 101 and 102, compare it with the theoretical stress-free manufacturing line shape 5, and extract the inclination angle change 6; S3: Based on the tangent assembly principle, the actual control parameters of the segment to be assembled are calculated according to the inclination change 6, that is, the theoretical installation elevation of the control point 202; S4: Use the matching pieces 3 between the arch rib segments to ensure that the ends of the upper surfaces of the segments to be assembled are in the same plane as the upper surfaces of the segments that have been erected; S5: Use the hanging point 4 to adjust the segment 2 to be assembled so that it rotates around the matching part 3 under the coordinated action of the matching part until the coordinate of its control point 202 reaches the theoretical installation elevation.

[0017] The principle of the present invention is as follows: when using the non-straight arch rib segment assembly control method, firstly, the coordinate values ​​of two preset control points of the assembled segment are obtained by conventional measurement means, and the stress-free manufacturing line shape 5 of the erected segment is drawn in Auto CAD or other industrial drawing software. Then, according to the control points 101 and 102, the stress-free manufacturing line shape 5 is rigidly rotated to obtain the actual assembly line shape 1 of the erected segment; the actual assembly line shape 1 of the erected segment is compared with the stress-free manufacturing line shape 5, and the inclination change 6 is extracted and recorded as ; Calculate the actual control parameters of the segment to be assembled, that is, the actual installation elevation of the control point 202, based on the inclination angle change 6; adjust the segment to be assembled 2 by the crane at the hanging point 4, so that it rotates around the matching part 3 until the coordinates of its control point 202 reach the theoretical installation elevation, adjust the height of the bracket 203, and fix the spatial position of the segment to be assembled 2.

[0018] In this embodiment, the first arch rib segment does not need to be assembled and controlled, and the coordinates of the actually measured control points after the segment is placed according to the stress-free manufacturing line are used as the preset coordinates of the measurement control points of the first segment.

[0019] Preferably, the actual control parameter of the segment to be assembled, i.e. the actual installation elevation of the control point 202, is calculated according to the inclination change amount 6, and the specific steps are as follows: The initial height difference of the control points 102 and 202 in the stress-free manufacturing line 5 is recorded as h ; After the inclination of the erected segment changes, the height difference change amount of the control points 102 and 202 is recorded as .

[0020] Preferably, the matching part 3 between the arch rib segments is used to ensure that the end of the segment to be assembled is in the same plane as the upper surface of the erected segment by adjusting the support 203, and the plug is inserted into the matching port reserved on the matching part 3 for fixation, and the segment to be assembled 2 can rotate around the matching port.

[0021] Preferably, the segment to be assembled 2 is adjusted by the lifting point 4, so that it rotates around the matching part 3 under the cooperation of the matching part, until the coordinates of the control point 202 reach the theoretical installation elevation, and the specific steps are as follows: The attitude of the segment to be assembled 2 is adjusted by the crane at the lifting point 4, so that the segment to be assembled 2 rotates as a rigid body around the matching part 3; and The target height difference of the control points 102 and 202 is , and when the target height difference is reached, it is considered that the segment to be assembled 2 has reached the theoretical installation elevation.

[0022] After the above technical scheme is adopted, the installation elevation of the non-straight arch rib segment in the assembling process under the small rigidity support can be accurately and efficiently determined, and the tangent assembling of the arch rib segment is realized. Moreover, by using this method, the influence of external construction load, support structure deformation and the pre-construction stage can be ignored, and the structure does not need to be simulated and analyzed in the construction process. According to the field measurement data of the last erected arch rib segment and the stress-free manufacturing line of the arch rib segment, the reasonable installation position of the next construction component is simply determined, so that the universality and application value of the method are improved. By using this method, only conventional engineering measuring instruments are needed, and no additional auxiliary measuring and calibration equipment is needed.

[0023] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for assembling a non-straight arch rib segment with small rigidity support, characterized in that, The method comprises the following steps: S1: presetting two control points 101 and 102 and 201 and 202 on the upper surface of each arch rib segment; S2: obtaining the position information of the erected segment 1 placed on the support through the measured coordinates of the control points 101 and 102, comparing the position information with the unstressed manufacturing line 5, and extracting the inclination change amount 6; S3: calculating the actual control parameters of the segment to be assembled, i.e. the theoretical installation elevation of the control point 202, based on the tangent assembling principle and according to the inclination change amount 6; S4: ensuring that the end of the upper surface of the segment to be assembled is in the same plane as the upper surface of the erected segment by using the matching part 3 between the arch rib segments; S5: adjusting the segment to be assembled 2 by using the lifting point 4, so that the segment to be assembled rotates around the matching part 3 under the cooperative action of the matching part, until the coordinates of the control point 202 of the segment to be assembled reach the theoretical installation elevation.

2. The method for controlling the assembly of non-straight arch rib segments under low-rigidity supports according to claim 1, characterized in that: The position information of the erected segment 1 placed on the support is obtained through the measured coordinates of the control points 101 and 102, and the inclination change amount 6 is extracted by comparing the position information with the unstressed manufacturing line 5. The specific steps are as follows: The unstressed manufacturing line 5 of the erected segment is drawn in Auto CAD or other industrial drawing software, and the unstressed manufacturing line 5 is rigidly rotated according to the control points 101 and 102 to obtain the actual assembling line 1 of the erected segment. Compare the actual assembled alignment 1 of the erected segment with the stress-free manufacturing alignment 5, and extract the inclination change 6, which is recorded as .

3. The method of claim 1, wherein the method further comprises: The actual control parameters of the segment to be assembled, i.e. the actual installation elevation of the control point 202, are calculated based on the tangent assembling principle and according to the inclination change amount 6. The specific steps are as follows: The initial height difference of the control points 102 and 202 in the stress-free manufacturing line 5 is denoted as h ; After the segment inclination has been changed, the height difference change amount of the control points 102 and 202 is denoted as .

4. The method of claim 1, wherein: The matching part 3 between the arch rib segments is used to ensure that the end of the upper surface of the segment to be assembled is in the same plane as the upper surface of the erected segment. The adjustment is realized by adjusting the support 203, and the plug is inserted into the matching opening reserved on the matching part 3 for fixation. Moreover, the segment to be assembled 2 can rotate around the matching opening.

5. The method of claim 1, wherein, The waiting segment 2 is adjusted by the lifting point 4 to rotate around the matching part 3 under the cooperation of the matching part until the coordinate of the control point 202 reaches the theoretical installation elevation, and the specific steps are as follows: the attitude of the waiting segment 2 is adjusted by the lifting machine at the lifting point 4, and the waiting segment 2 is rotated as a rigid body around the matching part 3; and The target elevation difference of the control points 102 and 202 is used as the target high difference, and when the target high difference is reached, it is considered that the waiting segment 2 has reached the theoretical installation elevation.

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