Crossing existing line bridge girder dismounting method

Abstract

The invention discloses a crossing existing line bridge girder dismounting method. A dismounted bridge girder is a girder crossing an existing railway line and is formed by splicing a plurality of girder segments to be dismounted from front to back. During complete set dismounting construction of any segment to be dismounted, the process comprises the following steps that firstly, a bridge deck pavement is milled, specifically, the bridge deck pavement of the girder segment constructed currently is milled; secondly, the girder segment is jacked up, specifically, the girder segment constructed currently is horizontally jacked upwards through a vertical jacking device, so that the girder segment constructed currently is separated from two supporting piers; thirdly, preparation operation before hoisting is conducted; and fourthly, the girder segment constructed currently is horizontally hoisted upwards through a bridge girder erection machine and moved to the outer sides of the two supporting piers. The method is simple in step, reasonable in design, easy and convenient to construct and good in application effect, the complete set dismounting construction process of the crossing existing line bridge girder can be completed easily, conveniently and rapidly, and the construction process is safe and reliable, the construction period is short, and the method is economic and practical.

Description

technical field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a method for removing a main girder of a bridge spanning an existing line. Background technique

[0002] In recent years, with the rapid development of national transportation infrastructure, some expressways built in the early stage can no longer fully meet the needs of current traffic volume, and the existing expressway reconstruction and expansion projects are increasing day by day. In particular, the bearing capacity of the original expressway bridges spanning the existing railway lines has declined, and it is almost unable to meet the increasing traffic load. It is imminent to strengthen and reconstruct those bridges with insufficient bearing capacity. In the construction of expressway reconstruction and expansion adjacent to or across the existing railway line, it has become a new research topic in the field of engineering construction and transporta...

Examples

Embodiment Construction

[0061] Such as figure 1 A method for dismantling the main girder of a bridge spanning an existing line is shown. The main girder of the bridge to be removed is a main girder spanning the existing railway line. The multiple beam sections 14 to be removed have the same structure and are all reinforced concrete beam sections, and the beam sections 14 to be removed are assembled from M reinforced concrete T beams 15 from left to right, wherein M is positive Integer and M≥3; the front and rear ends of the beam section 14 to be removed are respectively supported on a supporting pier, and the bridge deck pavement layer is laid on the beam section 14 to be removed; for any one of the beam sections to be removed When carrying out the demolition construction of the whole group in section 14, the following steps are included:

[0062] Step 1, bridge deck pavement milling: milling the bridge deck pavement on the currently constructed beam section;

[0063] The currently constructed beam...

technical field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a method for removing a main girder of a bridge spanning an existing line. Background technique

[0002] In recent years, with the rapid development of national transportation infrastructure, some expressways built in the early stage can no longer fully meet the needs of current traffic volume, and the existing expressway reconstruction and expansion projects are increasing day by day. In particular, the bearing capacity of the original expressway bridges spanning the existing railway lines has declined, and it is almost unable to meet the increasing traffic load. It is imminent to strengthen and reconstruct those bridges with insufficient bearing capacity. In the construction of expressway reconstruction and expansion adjacent to or across the existing railway line, it has become a new research topic in the field of engineering construction and transporta...

Examples

Embodiment Construction

[0061] Such as figure 1 A method for dismantling the main girder of a bridge spanning an existing line is shown. The main girder of the bridge to be removed is a main girder spanning the existing railway line. The multiple beam sections 14 to be removed have the same structure and are all reinforced concrete beam sections, and the beam sections 14 to be removed are assembled from M reinforced concrete T beams 15 from left to right, wherein M is positive Integer and M≥3; the front and rear ends of the beam section 14 to be removed are respectively supported on a supporting pier, and the bridge deck pavement layer is laid on the beam section 14 to be removed; for any one of the beam sections to be removed When carrying out the demolition construction of the whole group in section 14, the following steps are included:

[0062] Step 1, bridge deck pavement milling: milling the bridge deck pavement on the currently constructed beam section;

[0063] The currently constructed beam...

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