Karst area pile foundation protection device and construction method thereof

Abstract

The invention discloses a karst area pile foundation protection device and a construction method thereof. The karst area pile foundation protection device comprises a steel reinforcement cage, a protection cylinder and a connecting structure, the steel reinforcement cage and the protection cylinder are both arranged in a pre-dug pile hole, the pile hole penetrates through a karst cave, the bottomend of the steel reinforcement cage is arranged at the bottom of the pile hole in a supporting mode, the top end of the steel reinforcement cage is located over the karst cave, the protection cylinderis arranged on the outer side of the steel reinforcement cage in a sleeving mode and fixed to the steel reinforcement cage through the connecting structure, the bottom end of the protection cylinderis located under the karst cave, the bottom end of the protection cylinder and the bottom of the pile hole are arranged in a spaced mode, the top end of the protection cylinder is located over the karst cave, and the steel reinforcement cage and the protection cylinder are fixed to the interior of the pile hole through poured concrete. According to the karst area pile foundation protection deviceand the construction method thereof, on the condition of medium and large karst caves, the pile foundation construction quality can be guaranteed, the construction cost can be reduced, and destructionand pollution to the surrounding environment can be reduced.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a pile foundation protection device in karst areas and a construction method thereof. Background technique [0002] In the construction of bridge pile foundations, karst phenomena are often encountered. The karst phenomenon brings great uncertainty to the concrete construction of the pile foundation, and has a great impact on the construction quality and construction cost. Generally speaking, there are many methods for pile foundation construction to deal with karst caves, such as backfilling clay + chipping stone (or clay + chipping stone + cement), pre-grouting method (grouting slurry or cement slurry + water glass), follow-up method of full pile casing, etc. . However, the above methods have their disadvantages. For example, the method of backfilling clay + flakes (clay + flakes + cement) is generally suitable for smaller caves (the depth of the cave is ...

AI Technical Summary

Problems solved by technology

However, the above methods have their disadvantages. For example, the method of backfilling clay + flakes (clay + flakes + cement) is generally suitable for smaller caves (the depth of the cave is within 3m); the construction quality of the grouting method is difficult to control and will damage and pollute the surrounding environment. (It is very easy to affect the groundwater and the surrounding soil); the follow-up method of the whole pile casing refers to the follow-up method of the whole pile casing, passing through the karst cave area and going down to the bottom of the karst cave. When the pile foundation is long and the karst cave is in a deep position , due to the long length of the casing, the weight of the casing itself is too heavy, and it is not easy to hoist. There is a great safety risk in the construction process, and the amount of steel is large, and the construction cost is high

Images