Municipal soft foundation road reinforcing method

Abstract

The invention relates to the technical field of soft foundation road reinforcement, in particular to a municipal soft foundation road reinforcing method. The method comprises the steps that a field isleveled, and pile positions are determined; each pile position is downwardly drilled by one unit depth by taking the ground as a reference surface, and a soil body is removed to form a pile hole; thelower part of the hole wall of each pile hole is extruded and expanded in the circumferential direction to form a branch cavity; pile casings are lowered into the pile holes, the bottom ends of the pile casings abut against the bottom faces of the pile holes, grouting is conducted in gaps between the pile casings and the hole walls of the pile holes till gaps between the branch cavities and the pile holes and the gaps between the pile casings and the hole walls of the pile holes are filled with grout, and branch piles are formed after the grout is solidified; drilling is further performed bytaking the bottom surfaces of the pile holes as a reference surface, and the aforesaid steps are repeated until the pile holes are machined to a required depth; and grout is poured into all sections of the pile casings and the grout is solidified, where in the vertical direction, the outer diameter of a pile casing on a lower layer is smaller than or equal to the inner diameter of a pile casing onan upper layer, and the heights of all sections of the pile casings are equal. The reinforcing method has the effect that the branch pile forming quality is high.

Description

technical field [0001] The present application relates to the technical field of soft ground road reinforcement, in particular to a municipal soft ground road reinforcement method. Background technique [0002] Soft roads refer to weak soil layers with low strength and high compressibility. In the construction of municipal roads, when roads are built in soft soil areas, under the long-term load of vehicles, some areas of the road surface often suffer from subsidence and deformation, which seriously affects the normal use of the road, resulting in the need to repair some road sections in the later stage, not only Affect normal traffic, but also cause greater economic losses. [0003] At this stage, the requirements for municipal road construction are getting higher and higher, and the soft base needs to be reinforced before road paving. Squeeze-expansion branch pile technology is a commonly used reinforcement technology in soft foundation treatment. Its reinforcement proces...

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Problems solved by technology

[0004] The inventors found that, when the drilling depth is too large, the muddy soil in the soil base is prone to collapse and collapse during the process of squeezing and expanding the cavity of the support plate one by one along the axial direction of the hole when the drilling depth is too large. , resulting in the inability to extrude and expand the support disc cavity, which in turn affects the forming quality of the support disc pile

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