High-frequency static compaction-drainage-grouting composite foundation processing method and special equipment

Abstract

The invention discloses a high-frequency static compaction-drainage-grouting composite foundation processing method and special equipment. The main processes are as follows: hyperpressure compaction and active drainage, active grouting and active release of extra additional stress energy. According to the method, intermediate and shallow foundation soil compaction hard layers are formed rapidly, the whole vertical bearing force and horizontal side-sliding capability of the composite foundation soil can be promoted, and the phenomena that 'rubber soil' caused by overlarge external additional stress, the poor effects of post-construction settlement and differential settlement, and the collapse caused by side sliding of a large area of soil can be avoided. According to the method, 100% of combined preloading earthwork is saved, 50% of construction period can be shortened, more than 50% of construction cost is saved, and repeated pollution caused by exploit and transportation of a large amount of earthwork can be avoided. The method adapts to the construction of different soft soil layers and the field construction of complicated regions.

Description

technical field [0001] The invention relates to a high-frequency static pressure compaction drainage grouting composite foundation treatment method and special equipment, which are suitable for composite foundation treatment of various soft soils, backfill soils, and silt blowing backfill soils. It can quickly form a dense hard crust of medium and shallow foundation soil. The construction in the area where the noise and vibration impact indicators are strictly controlled has played a special role. Background technique [0002] At present, among the known methods for dealing with various types of soft soil and backfill soil, the traditional soft foundation construction method is to carry out vacuum water-covered preloading or vacuum combined surcharge preloading on the basis of the drainage board that has been driven in. Due to the limited effective additional stress provided by the vacuum water-covering preloading method, the free water and bound water in the deep soft soil...

AI Technical Summary

Problems solved by technology

Due to the limited effective additional stress provided by the vacuum water-covered preloading method, the free water and bound water in the deep soft soil cannot be well discharged, and the medium and shallow hard crust cannot be formed. The post-construction settlement and differential settlement are too large and exceed the standard

Vacuum combined surcharge preloading can improve the foundation bearing capacity of deep soft soil, but the cost is high, and a large amount of earthwork needs to be used for stacking and unloading, resulting in unnecessary waste and secondary pollution of transportation. It is not environmentally friendly and cannot form medium Shallow foundation soil dense hard crust

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