Aid-sedimentation construction method for open caisson engineering in dense round gravel layer or gravel layer

Abstract

The invention discloses an aid-sedimentation construction method for open caisson engineering in a dense round gravel layer or a gravel layer, which is mainly used for solving the construction problem encountered very easily in the prior art that an open caisson sinks slowly and even does not sink in open caisson construction under the geological condition of the dense round gravel layer or the gravel layer. The aid-sedimentation construction method comprises the following steps: rotationally cutting soil masses in the range of cutting edges by rotary spraying of high-pressure rotary spraying water so as to reduce the percentage of the hard round gravel layer and the frictional resistance of the soil masses and cause the open caisson to sink by own gravity, determining the depth, radius and spacing which are needed by rotary spraying according to L1 and X% after sequentially calculating the critical frictional resistance, the area of round gravels scattered by the rotary spraying water on the peripheral wall sides of the open caisson, the depth L1 of the soil piercing part of the open caisson above the cutting edges and the area proportion X% of the round gravel layer improved at the cutting edges, then selecting an appropriate high-pressure jet grouting pile machine for scattering the soil masses, and cutting earth in the open caisson so as to cause the open caisson to sink by own gravity. By adopting the technical scheme, the aid-sedimentation construction method achieves the purpose of causing the open caisson to easily sink.

Description

technical field [0001] The invention relates to the field of caisson engineering, in particular to a construction method for caisson engineering in dense round gravel layers or gravel layers. Background technique [0002] The caisson is a well-shaped structure. It excavates the soil in the well, relies on its own gravity to overcome the friction of the well wall, and then sinks to the design elevation. Then it is sealed with concrete and the well hole is filled to make it a bridge pier (water pump room, pipe jacking well) or the foundation of other structures; it has been widely used in municipal engineering and other construction projects, and this construction technology has gradually matured. However, in the construction of caissons under the geological conditions of dense round gravel layer or sandy gravel layer, it is very easy to encounter the construction problem that the caisson sinks slowly or even does not sink. Contents of the invention [0003] The problem to ...

AI Technical Summary

Problems solved by technology

However, in the construction of caissons under the geological conditions of dense round gravel layers or sandy gravel layers, it is very easy to encounter the construction problem that the caisson sinks slowly or even does not sink.

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