Soft soil foundation excitation well digging device and construction method thereof

Abstract

The invention relates to a soft soil foundation excitation well digging device which comprises a well digging steel pipe, a vibratory hammer, a compressing hammer and a dewatering well pipe. A construction method of the soft soil foundation excitation well digging device comprises the steps that firstly, the well digging steel pipe is struck into the underground; the well digging steel pipe is filled with medium-coarse sand; then the well digging steel pipe is lifted up; the medium-coarse sand forms a sand well; then the well digging steel pipe is struck into the sand well; and finally the dewatering well pipe is put into the well digging steel pipe, and the well digging steel pipe is taken out. According to the soft soil foundation excitation well digging device and the construction method thereof, the dewatering construction problem that existing well drilling machinery cannot be adapted to a complicated site is mainly solved; the methods of vibration hole forming and steel pipe wall protecting are adopted, so that well digging construction of different soil textures can be adapted; the process of repeated digging and well forming is adopted, the medium-coarse sand is evenly squeezed in the hole wall in a dense mode, a whole water filtering layer from top to bottom is formed, and a foundation is established for lowering the underground water level and reducing the soil water content.

Description

technical field [0001] The invention relates to a vibration-drilling device for a soft soil foundation and a construction method thereof, belonging to the technical field of foundation treatment. Background technique [0002] At present, the large-area soft soil foundation reinforcement treatment adopts the method of lowering the groundwater level, and after meeting the conditions of reducing the water content of the soil, the method of dynamic reinforcement such as dynamic compaction is used to increase the bearing capacity of the soil, which is widely used; the method of reducing the groundwater level of the soil The method is generally realized by the method of well point dewatering and tube well dewatering. In these two processes, the depth of the tube well dewatering can reach below 20m due to the insertion into the soil, and relying on the principle of hydraulic weight release, the dewatering depth can reach below 10m. Improving the tamping energy creates conditions, s...

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Problems solved by technology

In the actual construction, each step has a great influence on the success of well completion. First, the soil condition has requirements on the slurry ratio, especially the flow plastic silt soil. Due to its high sensitivity, the slurry ratio is difficult to meet the soil layer. Therefore, in the actual construction process, it is difficult to insert the tube well into this layer

Second, when the tube well is put into the hole, the surrounding wall needs to be backfilled with medium-coarse sand. Under current conditions, manual backfilling is generally used. The amount of backfilling is large and the labor intensity is high. If corners are cut, it will affect the quality of subsequent precipitation.

Third, in the well cleaning process, a large amount of clean water is required to replace the slurry entering the tube well with clean water until the submersible pump in the tube well pumps out clean water, which not only wastes a lot of electricity and labor, but also increases the construction cost

Fourth, the use of drilling rigs to form holes has high requirements on soil conditions. In case of rocks or hard soil, it is difficult to form holes, the drilling speed is greatly affected, and it is even impossible to drill.

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