Mountainous area bridge construction method with large water volume change

Abstract

The invention discloses a mountainous area bridge construction method with large water volume change, which comprises the following steps: preparation before construction: in a drawing rechecking stage, carefully checking the bridge structure size and the part elevation, calculating the engineering quantity, and carefully comparing and analyzing whether the design ground elevation and the longitudinal and transverse sections at the pier position are consistent with the reality; making sufficient technical data preparation before construction, and determining the excavation position and the excavation depth of the pile foundation; and bridge foundation construction: measuring and setting out to determine the position of a foundation pit, then carrying out manual hole digging by adopting a delayed blasting method, removing slag after hole digging, repairing a hole wall, then expanding a hole in a rock mass at the bottom of a pile hole, placing a reinforcement cage in the pile hole, and placing an expanded reinforcement cage in the expanded hole. The method has the beneficial effects that the concrete follow-up retaining wall is adopted, the construction safety and the pouring quality of pile foundation concrete are ensured, the number of used mechanical equipment is small, the construction investment is reduced, the engineering cost is reduced, the professional degree of construction is small, the construction face is wide, the number of excavation points is large, and the construction progress is accelerated.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a bridge construction method in mountainous areas with large water volume changes. Background technique [0002] The terrain in mountainous areas with steep slopes is complex, the ground is rugged and undulating, and most of them are mountains, hills and rugged plateaus. The transportation is not suitable for popularization, the infrastructure construction is difficult, and the economic base is relatively backward. The distribution of landslides or mudslides is generally more likely to occur in mountainous areas. We call this kind of disaster sudden geological disasters. Then in the high and middle mountainous areas of the west, such as Hunan, Hubei, Yunnan, Guangxi, Guizhou, Sichuan, and Tibet All can happen, and small landslides and mudslides can also occur in some mountainous areas along the coasts of Fujian, Guangdong, and Zhejiang in southeastern China. One situation i...

AI Technical Summary

Problems solved by technology

[0003] Therefore, in the processing and manufacturing process of the bridge, due to the large self-weight of the concrete, the tensile strength is very low, and the spanning capacity is small, but if the bridge is constructed with lightweight concrete, it will have a greater impact on the bearing capacity of the bridge body. It cannot meet the load-bearing requirements of highways, railways, etc. for bridges

On the other hand, the concrete arch bridges built in some canyons with flowing water have a weak ability to resist the impact of large flow velocity water. Concrete itself will inevitably crack and produce gaps, so this type of concrete arch bridge requires frequent maintenance, and the later maintenance costs are relatively high

[0004] For the problems in related technologies, no effective solutions have been proposed yet

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