A construction device and construction method of a spray-mixing and diameter-expanding reinforcement pile

Abstract

The invention provides a construction device and construction method for a stirring and spraying expanded reinforcement pile. The construction device is characterized in that a drill pipe is formed by coaxially overlapping an outer pipe body and an inner pipe body in a sleeving mode and provided with a rotary power mechanism, a lifting device and a variable-diameter telescopic stirring arm; the inner pipe body is provided with a spiral drill bit and a spraying nozzle, and high-pressure ejection, forced stirring, improvement on the drilling speed and adjustment of the specifications of a pile body and an expanded body are realized through the operations of arm folding, arm unfolding, rotating, high-pressure grouting and the like. The construction method is characterized in that the setting parameters and design scheme of the pile body and the expanded body of the reinforcement pile are designed in advance. The method includes the particular construction steps that (1) pile positions are aligned; (2) the expanded body and the pile body of the reinforcement pile are constructed in a mode A (from top to bottom) or mode B (from bottom to top) according to the advanced design; (3) the stirring and spraying expanded reinforcement pile which accords with the advanced design and is provided with the expanded body is formed; and (4) subsequent construction is carried out through multiple methods and includes manufacturing of a reinforcement body pile body and pile end carriers and laying of a cushion layer.

Description

technical field [0001] The application relates to the field of civil engineering, in particular to a construction device and a construction method for a diameter-expanding reinforcement pile by stirring and spraying. Background technique [0002] At present, in the foundation treatment engineering in the field of construction engineering, the cement reinforcement method is widely used in the foundation treatment method, among which the deep mixing method and the high-pressure rotary spraying method are the most commonly used. The advantages of these two methods are that the cost is reasonable and the scope of application It is widely used, especially the original soil can be used, but it also has its limitations. For example, the deep mixing method has high requirements on the soil quality, and it is very easy to affect the bearing capacity due to the difference in the strength of the pile body due to uneven mixing. The process control of the high-pressure rotary spraying met...

AI Technical Summary

Problems solved by technology

However, the construction of prefabricated piles usually adopts the hammering method, and its bearing capacity mainly comes from side friction resistance, and the end bearing resistance is small. Therefore, when using in buildings with high bearing capacity requirements, the length and diameter of prefabricated piles must be increased. To meet the upper load requirements, it will bring greater difficulty to the hammering construction of prefabricated piles, especially when there are hard interlayers such as sand layers and pebble layers in the ground, the construction of prefabricated piles will be more difficult and inefficient. Even if the pile head or pile bottom is cracked, the design depth cannot be reached, which seriously affects the construction progress and the quality of the pile body

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