A Form-Finding Rigid Connection Method for Erecting Steel Truss Stiffeners of Suspension Bridges

Abstract

The invention discloses a form-finding rigid connection method for erecting a steel truss stiffening beam of a suspension bridge. During implementation, a reasonable hoisting method and erection sequence are selected according to design data and comprehensively considering factors such as restrictions on construction site transportation conditions, and a specific temporary connection of stiffening beams is formulated. When erecting and installing the stiffened girders, follow the rigid connection scheme and the bridge deck welding scheme; in the process of erecting the stiffened girders, use the linear changes of the installed girder sections during the construction process to find the corresponding stress-free The rigid connection of the beam sections is completed under the stress-free state, and the welding of the bridge deck of each beam section is carried out after the rigid connection of each beam section is completed; when all the stiffening beams are erected, the rigid connection and welding of the beam sections are also completed simultaneously. Welding of bridge decks. Compared with the traditional construction technology, all temporary hinge joints need to be converted from hinge to reinforcement after the bridge deck construction and counterweight construction are completed, which has been greatly improved.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a form-finding rigid connection method for erecting steel truss stiffening beams of suspension bridges. Background technique [0002] At present, in the process of erecting steel truss stiffened girders of suspension bridges, the girder segment connection methods of stiffened girders can be mainly divided into three types: sequential rigid connection method, full hinge method and segmented rigid hinge method. In recent years, window hinge method has appeared. . The successive rigid connection method will improve the stability of the girder erection process, but the main problem is that very large stress will be generated in the stiffened beam and the front end sling. If it is not controlled, its value will often exceed many times the allowable stress, and The larger the span, the more difficult it is to control; due to the full hinge of the beam section, the lateral deformatio...

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Problems solved by technology

The successive rigid connection method will improve the stability of the girder erection process, but the main problem is that very large stress will be generated in the stiffened beam and the front end sling. If it is not controlled, its value will often exceed many times the allowable stress, and The larger the span, the more difficult it is to control; due to the full hinge of the beam section, the lateral deformation of the stiffened beam is relatively large under the action of wind load during erection, so its wind resistance stability is relatively poor, and the construction operation is also unstable. , the installation of the second-stage load by the full-hinge method first requires the rigid connection of temporary connections, and the beam sections cannot be connected before the equivalent pressure of the second-stage dead load is applied. On the one hand, it is quite difficult to implement the equivalent pressure , on the other hand, it will increase the time for the full hinge of the beam segment; compared with the full hinge method, the segmented rigid hinge method improves the structural rigidity and stability, and there are also similarities, that is, it needs to be replaced by bridge deck and bridge deck pavement. The hinge-to-solid conversion is performed after the load is in place, and the hinge-to-solid conversion at the temporary hinge needs to occupy the key construction period alone, and the construction efficiency is not ideal; the main feature of the window hinge method is to pay close attention to the position of each hinge point during the actual construction process. The opening changes, and the hinge-to-solid conversion is completed according to the actual construction situation. There are many uncertain factors, and the construction process cannot be arranged in an overall manner, and the rigid relay is uncertain at the time of rigid connection.

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