Steel casing type deep sea vibroflotation pile construction method

Abstract

The invention discloses a steel casing type deep sea vibroflotation pile construction method. The steel casing type deep sea vibroflotation pile construction method comprises the steps that (1) a steel casing is driven to a set depth below a sea bottom surface at a set pile position by a floating crane installed on a crane vessel; (2) seawater inside the steel casing is pumped, and soil inside thesteel casing is removed; (3) a vibrator is placed into the steel casing through the floating crane and descends to the specified depth, sand is backfilled into the steel casing, and then the vibratoris started to vibrate the sand; (4) the floating crane is used for simultaneously lifting the steel casing and the vibrator, and the sand is continuously backfilled into the steel casing and vibratedsection by section; and (5) when the steel casing and the vibrator leave the sea bottom surface, backfilling of the sand is stopped, and the vibrator is closed to complete the pile making process. Byusing the steel casing type deep sea vibroflotation pile construction method, a water-free environment can be created in a deep water area for construction to prevent filler such as the backfilled sand from being washed away by the water flow, the construction difficulty of reinforcing a foundation in the deep water area is greatly reduced, and the construction stability is increased.

Description

technical field [0001] The invention relates to the fields of port and coastal engineering, water conservancy engineering and geotechnical engineering, in particular to the field of underwater foundation reinforcement. Background technique [0002] Vibration method can be divided into vibro compaction method and vibro replacement method according to the different reinforcement objects. The former is mainly used for the reinforcement of coarse-grained soil such as medium and coarse sand, while the latter is mostly used for the reinforcement of fine-grained cohesive soil. Using the vibro-shock method to treat the sandy soil foundation can not only improve the bearing capacity and deformation modulus of the foundation, but also improve the seismic performance. Vibration method is used for cohesive soil foundation treatment, mainly to form sand piles with larger diameters in the soil, and form a composite foundation together with the surrounding soil. [0003] Underwater founda...

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Problems solved by technology

[0003] Underwater foundation reinforcement of foundations of marine structures is usually difficult

If the cofferdam method is used for dry construction, it has the disadvantages of large construction volume, long construction time, and poor economic benefits.

If the vibrating method is used to strengthen the foundation of cohesive soil, under the influence of deep sea water, the underwater clearing hole and sand backfill are easily scoured by sea water, causing marine environmental pollution

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