Temporary steel trestle constructing method and trestle

Abstract

The invention discloses a temporary steel trestle constructing method and a trestle and relates to the field of bridge construction. The temporary steel trestle constructing method sequentially comprises the following steps of prefabricating standardized structural elements, prefabricating synthetic-wood bridge deck slab standardized structural elements and splicing bridge deck layers. The trestle comprises a supporting structure, a main beam arranged above the supporting structure, a beret frame arranged above the main beam and a synthetic-wood bridge deck layer arranged above the beret frame. The synthetic-wood bridge deck layer is formed by a plurality of synthetic-wood bridge deck slabs which are horizontally and sequentially spliced. Each synthetic-wood bridge deck slab is formed by a plurality of synthetic-wood primary beams, a plurality of synthetic-wood secondary beams, a plurality of synthetic-wood clamping beams and a plurality of synthetic-wood face boards which are integrally spliced. The temporary steel trestle constructing method is convenient, quick and reliable to construct, achieves the purpose of environmental friendliness, is economical and is low in construction cost. The trestle erected through the constructing method is high in strength, better in reliability, better in mechanical performance, better in corrosion resistance and better in fire resistance. Furthermore, components of the trestles can be used repeatedly.

Description

technical field [0001] The invention relates to the field of bridge construction and is suitable for the construction of temporary steel trestle bridges, especially for the construction of steel trestle bridges with long length, large scale and tight construction period. Background technique [0002] 1) The structural form of the traditional trestle bridge: [0003] In bridge construction, the trestle bridge is used as a temporary bridge facility built to transport materials, equipment, and personnel. River and sea-crossing bridges are often built with relatively long trestles, which require a lot of manpower and material resources. At present, the longest construction trestle in the world-the construction trestle on the south bank of Ningbo Hangzhou Bay Bridge has a total length of 9,444 meters and a total of 633 spans. It can be seen that the optimization of trestle structure is of great significance to the progress and cost of trestle construction. [0004] At present, ...

AI Technical Summary

Problems solved by technology

[0006] 2) Limitations of traditional construction:

[0007] For the steel bridge deck, because its structure is lighter than the reinforced concrete deck under the same conditions, and the turnover is convenient, it is widely used in fresh water as the trestle deck deck, but the material price of this deck is relatively high, especially for seawater environments , its corrosion resistance is poor, and it needs to do anti-corrosion coating and other work

[0008] For the reinforced concrete bridge deck, due to the corrosion resistance of the concrete itself, it is more suitable for the seawater environment, but it needs to be prefabricated in the backyard, occupying the construction site; and its own weight is heavy, which is not conducive to the turnover between projects; after one use It becomes waste, which does not meet the requirements of energy saving and environmental protection

[0009] For wooden bridge decks, it combines the advantages of steel bridge decks and reinforced concrete bridge decks, and has the characteristics of light weight, convenient turnover, and good corrosion resistance. However, as a natural material, there are natural defects of wood, such as turtles. Cracks, warping, scarring, obvious color difference, etc., the variability of its strength is relatively large, so there are certain safety risks during the construction process of the project; moreover, wood is flammable, and it is easy to be damaged due to welding, etc. during the construction process. What's more, high-quality natural wood is a limited resource of the country. If large-scale mining does not meet the requirements of the country's low-carbon environmental protection economic development model

[0010] Moreover, in terms of construction technology, traditional steel bridge decks and reinforced concrete bridge decks are heavy and require large-scale hoisting equipment. Some hoisting equipment even become the most unfavorable control load of the trestle bridge, thus increasing the amount of main girder of the trestle bridge. , and for the laying of wooden structure panels need to be laid one by one, the construction period is poor, and the integrity of the panels is poor

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