Elevated trestle bridge construction method on covering-free steep bare rock in deepwater and rapid stream

Abstract

The invention specifically relates to an elevated trestle bridge construction method on covering-free steep bare rock in deepwater and rapid stream. A scheme of the invention is as follows: the elevated trestle bridge construction method comprises the following steps of: constructing a first porous trestle bridge on the bank, then constructing a second porous trestle bridge by adopting a cantilever method, and arranging guide frames on the tail end part of the second porous bridge; settling cut steel pipe piles in mounting sites, then casting an underwater concrete layer in the steel pipe piles, and drilling an anchor hole along the central axis direction of each steel pipe pile after the underwater concrete layer is cured, wherein each anchor hole penetrates through the underwater concrete layer and extends into basement rock of a river bed; and finally arranging an anchor bolt in each anchor hole, grouting and anchoring, then assembling a truss to form a third porous trestle bridge, and repeating the steps till finishing the construction of the whole trestle bridge. The elevated trestle bridge construction method disclosed by the invention has the advantages of reducing the deep diving operation load and the construction risk by adopting an underwater exploration technology in combination with precutting of a bottom opening of each steel pipe pile on the bank, enabling each steel pipe pile to be firmly anchored on the steep bare rock surface by adopting the anchor bolt grouting and rock-socketing technology between the steel pipe pile and the steep bare rock surface, shortening the construction peroiod and reducing the construction cost.

Description

technical field [0001] The invention belongs to the field of bridge construction, and in particular relates to a high-level trestle construction method on steep bare rock without covering layer in deep-water rapids. Background technique [0002] With the development of social economy, the demand for convenient transportation is becoming more and more intense, and there are more and more bridge projects built on various geology. In the construction of bridge water foundation, trestle bridges are widely used as construction channels for materials, equipment and personnel. Domestic trestle bridges mostly adopt the structural method of steel pipe piles and Belay trusses. However, the trestle bridges in the past were generally built on rivers and lakes with thick covering layers. Under such geological conditions, the foundation construction of the trestle bridge leading to the main project is generally carried out by the traditional "fishing method", that is, to place steel pipe ...

AI Technical Summary

Problems solved by technology

[0008] In summary, the above schemes all have the disadvantages of heavy workload, long construction period, and high cost.

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