A construction method of steel trestle bridge resisting the impact of flood discharge rapids

Abstract

The invention discloses a steel trestle construction method for resisting the impact of flood discharge rapids. The steel trestle construction method comprises the steps that a foundation comprises large and small steel pipe piles arranged at intervals in the longitudinal bridge direction, and hoop type joint systems are installed between the adjacent steel pipe piles in the transverse bridge direction; bottom openings of the small steel pipe piles are inserted into a rock surface in a piling mode, and distributive beams are embedded in the bottom openings of the small steel pipe piles throughpile top grooves to be tightly attached to a trestle main beam; after bottom openings of the large steel pipe piles are inserted into the rock surface in a piling mode, temporary brackets are weldedto both sides of pile bodies in the bridge axial direction, then distributive beams are placed to be tightly attached to the trestle main beam, when the trestle bridge is assembled to the front of therow of steel pipe piles with a length of not less than 2 times of a hole span, a percussion drill is arranged at the position, at the row of steel pipe piles, on the trestle main beam, the large steel pipe piles are used as pile casings for milling holes and following up to the designed elevation in a rock stratum, the temporary brackets are cut off, formal brackets are rewelded, top openings ofthe large steel pipe piles are cut to be flush with the trestle main beam, and the lower ends of the large steel pipe piles are filled with underwater concrete to form anchor resisting piles. The steel trestle construction method for resisting the impact of the flood discharge rapids is rapid in construction and rapid in formation of water passages, anchor resisting pile construction is performedon land, the working environment is good, and capital investment is low.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for a steel trestle bridge erected in the downstream area of ​​a reservoir and capable of resisting the impact of flood discharge rapids. Background technique [0002] During the construction of the bridge foundation in the water, steel trestles are generally used to pull the two banks through to form a water operation channel for material transportation and construction machinery and equipment. Due to the advantages of simple driving process and strong structural force, steel pipe piles are often used in the lower foundation of steel trestle bridges in water. However, if the construction is carried out in the downstream area of ​​the reservoir, the riverbed has no soft covering layer under the flood discharge of the reservoir, and the surface layer is mostly gravel and pebbles. When the underlying rock layer conditions, the lower foundation of t...

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Problems solved by technology

However, if the construction is carried out in the downstream area of ​​the reservoir, the riverbed has no soft covering layer under the flood discharge of the reservoir, and the surface layer is mostly gravel and pebbles. When the underlying rock layer conditions, the lower foundation of the trestle in the water all adopts the disadvantage of inserting steel pipe piles. The anchorage length is short, and it is vulnerable to the impact of short-term flood discharge rapid velocity, which leads to the deterioration of the overall stability of the steel trestle bridge, which in turn causes unfavorable consequences such as instability and collapse; while the connection of reinforced concrete bored piles under the steel pipe piles requires a large area of ​​water work, not only The construction period is long, and the investment in water equipment and materials is large, and the safety risk of personnel operation is high

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