Large-span steel truss girder linetype control method

Abstract

The invention discloses a linear control method for a large-span steel truss girder, and relates to the technical field of bridge control. The method includes the following steps that main beam stress monitoring, main beam deformation monitoring and comprehensive monitoring technologies are used for monitoring stress parts of the large-span steel truss and internal and external stress and strain of components, and monitoring point data are obtained; carrying out numerical simulation calculation on the steel truss girder by utilizing Meda civil to obtain a numerical simulation calculation result; and comparing monitoring point data with a numerical simulation calculation result, and carrying out linear control on the most unfavorable rod piece arrangement stress measuring point of the component. The method can reduce the workload of manual measurement, enables the data to be more accurate, enables the deformation early warning to be more accurate, and achieves better technical benefits.

Description

Technical Field

[0001] The invention relates to the technical field of bridge control, and more particularly to a linear control method for a large-span steel truss beam. Background Art

[0002] Bridge rotation construction refers to a construction method in which the bridge structure is formed (cast or spliced) in a non-design axis position and then rotated into place. It can convert operations above obstacles into operations on the shore or near the ground. According to the rotation direction of the bridge structure, it can be divided into vertical rotation construction method, horizontal rotation construction method (referred to as vertical rotation method and horizontal rotation method) and a combination of horizontal rotation and vertical rotation, among which the horizontal rotation method is the most widely used. It is mainly used in situations where support cannot be provided, such as crossing canyons, rivers, railways, and highways. The rotation system of the rotating bridge consists of a lower turntable, an upper turntable, a ball joint, a slideway, and a traction system. The rotation process is generally achieved by pulling the traction cable with a jack to form a rotational force.

[0003] At present, rotating bridges often use measurement technology to regularly measure the plane and vertical alignment of key components such as the bridge main beam to analyze the degree of deviation from the design standards.

[0004] In the prior art, the measurement of stress concentration sites is not accurate enough and the work efficiency is low; generally, only the surface strain of the component can be measured, and it is difficult to display the internal strain. Therefore, a linear control method for a large-span steel truss is invented to solve the problem of automatic monitoring of geometric linear shape and internal force conditions and improve accuracy.

[0005] Therefore, it is an urgent problem for those skilled in the art to propose a method for controlling the linear shape of a large-span steel truss to solve the difficulties existing in the prior art. Summary of the invention

[0006] In view of this, the present invention provides a linear control method for a large-span steel truss beam, which is used to solve the technical problems existing in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A method for controlling the linear shape of a large-span steel truss beam comprises the following steps:

[0009] Main beam stress monitoring, main beam deformation monitoring and comprehensive monitoring technology are used to monitor the stress positions of large-span steel trusses and the internal and external stresses and strains of components to obtain monitoring point data;

[0010] Use Midas Civil to perform numerical simulation calculations on steel trusses and obtain numerical simulation calculation results;

[0011] The monitoring point data are compared with the numerical simulation calculation results, and linear control is performed on the stress measurement points of the most unfavorable rod arrangement of the component.

[0012] The above method optionally includes comprehensive monitoring technologies including: stress and settlement monitoring of assembled supports, stress and settlement monitoring of rotating supports, stress and deformation monitoring of slideway beams, and stress and displacement monitoring of turntables.

[0013] In the above method, optionally, the main beam stress monitoring includes: monitoring the stress value at the stress monitoring point and comparing it with the corresponding numerical simulation calculation result.

[0014] The above method optionally includes monitoring the deformation of the main beam as follows: monitoring the key cross-sectional position of the main beam, the deformation and elevation of the rod during the construction process, taking six deformation measuring points of the key cross-sections, namely, 1 / 4, mid-span and 3 / 4 cross-sections, and formulating the control threshold of the measuring points according to the displacement.

[0015] In the above method, optionally, 3 of the 6 deformation measuring points are close to the support side, 3 are close to the railway side, and another 4 are arranged as deformation correction measuring points.

[0016] The above method can be optionally used to perform numerical simulation calculations on the steel truss using Midas Civil, including: the stress of the main beam after assembly, the stress of the main beam during the beam dropping process, the stress of the main beam during the lifting process, and the stress of the main beam during the rotation process.

[0017] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method for controlling the linear shape of a large-span steel truss beam, which has the following beneficial effects:

[0018] By monitoring the stress values ​​of the main beam stress monitoring points, monitoring the deformation and elevation of the rods at the key cross-section positions of the main beam during construction, and comparing the results with the numerical simulation calculation results of the corresponding construction stage, a technical method can be used to determine the most unfavorable rod arrangement stress measurement points for each type of component, thereby determining a linear control method for large-span steel trusses. Through the invented linear control method, the workload of manual measurement can be reduced, the data can be made more accurate, the deformation warning can be more precise, and better technical benefits can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A flow chart of a method for controlling the linear shape of a large-span steel truss provided by the present invention;

[0021] Figure 2 The stress diagram of the assembled main beam provided by the present invention;

[0022] Figure 3 A main beam stress diagram of the beam drop process provided by the present invention;

[0023] Figure 4 A stress diagram of the main beam during the jacking process provided by the present invention;

[0024] Figure 5 The stress diagram of the main beam during the rotation process provided by the present invention;

[0025] Figure 6 This is a deformation position monitoring diagram provided by the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0027] See also Figure 1 As shown, the present invention discloses a method for controlling the linear shape of a large-span steel truss beam, comprising the following steps:

[0028] Main beam stress monitoring, main beam deformation monitoring and comprehensive monitoring technology are used to monitor the stress positions of large-span steel trusses and the internal and external stresses and strains of components to obtain monitoring point data;

[0029] Use Midas Civil to perform numerical simulation calculations on steel trusses and obtain numerical simulation calculation results;

[0030] The monitoring point data are compared with the numerical simulation calculation results, and linear control is performed on the stress measurement points of the most unfavorable rod arrangement of the component.

[0031] Furthermore, the comprehensive monitoring technology includes: assembly support stress and settlement monitoring, rotating support stress and settlement monitoring, slideway beam stress and deformation monitoring, and turntable stress and displacement monitoring.

[0032] Furthermore, the main beam stress monitoring includes: monitoring the stress value at the stress monitoring point and comparing it with the corresponding numerical simulation calculation result.

[0033] Furthermore, the deformation monitoring of the main beam is as follows: monitoring the key cross-sectional position of the main beam, the deformation and elevation of the rods during the construction process, taking six deformation measuring points of the key cross-sections, namely 1 / 4, mid-span and 3 / 4 sections, and formulating the control threshold of the measuring point according to the displacement.

[0034] Furthermore, among the six deformation measuring points, three points are close to the support side, three points are close to the railway side, and another four points are arranged as deformation correction measuring points.

[0035] Specifically, D1, D3, and D5 are close to the support side, D2, D4, and D6 are close to the railway side, and D0, D0', D7, and D7' are deformation correction measurement points. The deformation monitoring positions are as follows: Figure 6 As shown, the red line indicates the measuring point is close to the assembly bracket side, and the blue line indicates the measuring point is close to the railway side.

[0036] Furthermore, Midas Civil is used to perform numerical simulation calculations on steel trusses, including: the stress of the main beam after assembly, the stress of the main beam during the beam dropping process, the stress of the main beam during the lifting process, and the stress of the main beam during the rotation process.

[0037] Specifically, the stress of the assembled main beam is as follows: Figure 2 As shown in the figure, the stress of the main beam during the drop process is as follows: Figure 3 As shown in the figure, the stress of the main beam during the lifting process is as follows: Figure 4 As shown in the figure, the stress of the main beam during the rotation process is as follows: Figure 5 shown.

[0038] In a specific embodiment, a large-span steel truss linear control method is implemented based on the rotation of the existing steel trusses of the 62#-63# piers of the Shanghai Songjiang Bridge (Chunshen Bridge Section) with 1-128m bottom-supported steel trusses spanning the existing Shanghai-Kunming Railway and Jinshan Up Line.

[0039] 1. Main beam stress monitoring

[0040] Main beam stress monitoring is to monitor the stress value at the stress monitoring point and compare it with the numerical simulation calculation results of the corresponding construction stage.

[0041] According to the main beam stress calculation results and combined with the construction process, stress measurement points are arranged for the most unfavorable members of each type of component.

[0042] 2. Main beam deformation monitoring

[0043] The main beam deformation monitoring mainly monitors the deformation and elevation of the key cross-sections of the main beam during the construction process; the key cross-sections are 1 / 4, mid-span and 3 / 4 sections, a total of 6 deformation measurement points (D1, D3, D5 are close to the support side, D2, D4, D6 are close to the railway side, and D0, D0', D7, D7' are deformation correction measurement points). Calculate the control threshold of each measurement point.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the linear shape of a large-span steel truss beam, characterized in that: The following steps are involved: Main beam stress monitoring, main beam deformation monitoring and comprehensive monitoring technology are used to monitor the stress positions of large-span steel trusses and the internal and external stresses and strains of components to obtain monitoring point data; Use Midas Civil to perform numerical simulation calculations on steel trusses and obtain numerical simulation calculation results; The monitoring point data are compared with the numerical simulation calculation results, and linear control is performed on the stress measurement points of the most unfavorable rod arrangement of the component.

2. A method for controlling the linear shape of a large-span steel truss according to claim 1, characterized in that: Comprehensive monitoring technologies include: assembly support stress and settlement monitoring, rotating support stress and settlement monitoring, slideway beam stress and deformation monitoring, and turntable stress and displacement monitoring.

3. A method for controlling the linear shape of a large-span steel truss according to claim 1, characterized in that: Main beam stress monitoring is: monitoring the stress value at the stress monitoring point and comparing it with the corresponding numerical simulation calculation results.

4. A method for controlling the linear shape of a large-span steel truss according to claim 1, characterized in that: The main beam deformation monitoring is as follows: monitoring the key cross-section position of the main beam, the deformation and elevation of the rods during the construction process, taking six deformation measuring points of the key cross-sections, namely 1 / 4, mid-span and 3 / 4 sections, and formulating the control threshold of the measuring point according to the displacement.

5. A method for controlling the linear shape of a large-span steel truss according to claim 4, characterized in that: Among the 6 deformation measuring points, 3 points are close to the support side, 3 points are close to the railway side, and the other 4 points are arranged as deformation correction measuring points.

6. A method for controlling the linear shape of a large-span steel truss according to claim 1, characterized in that: The numerical simulation calculation of steel trusses using Midas Civil includes: the stress of the main beam after assembly, the stress of the main beam during the beam dropping process, the stress of the main beam during the lifting process, and the stress of the main beam during the rotation process.

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