Method for splicing highfill roadbed by adopting pile-sheet retaining wall

Abstract

The invention discloses a method for splicing a highfill roadbed by adopting a pile-sheet retaining wall, comprising the following steps of: forming an operation platform by using an old roadbed (1), a cutting slope (5) and an excavation step (6); longitudinally constructing an excavation filling pile (11); hoisting the cutting slope (5) and the excavation step (6) layer by layer from bottom to top during construction; installing a reinforced concrete soil retaining plate (12) so that the reinforced concrete soil blocking plate (12) is in overlap joint with the excavation filling pile (11); constructing an excavation C10-C12 element concrete pile (9) and a C20 reinforced concrete pile follower (10) step by step; and filling and compacting filler (7) layer by layer to realize seamless overlap joint of an old road surface (3) and a new road surface (4). The method has the advantages of no increase of occupied land, simple and convenient construction machines, short construction period, low cost and simplicity in maintaining traffic moving, thereby being extremely suitable for road sections widened by using highfill.

Description

technical field [0001] The invention belongs to the technical field of road and railway subgrades, and mainly relates to a high-fill subgrade splicing method. In particular, a method for splicing high-fill roadbeds using pile-plate retaining walls is provided. Background technique [0002] At present, in highway and railway subgrade reconstruction and expansion projects, the main schemes adopted are: double-sided splicing, single-sided widening and separate subgrade. [0003] The double-sided splicing has the advantages of less land occupation, large traffic capacity, and cost saving, etc., and has been fully applied in the reconstruction and expansion of expressways in plain hilly areas and some mountain areas. However, the original expressway was limited by the design guiding ideology and economic conditions at that time, and there were many high-filled road sections, and it was difficult to implement the double-sided widening method. [0004] The double-sided widening t...

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Problems solved by technology

[0006] Since it is difficult to avoid the influence of the subsidence settlement of the new widened subgrade on the old road when the above two kinds of high fill are spliced, combined with the current design concept of safety and environmental protection, it is advisable to use bridges for expansion when splicing the original high fill road section, but the old road subgrade and pavement comprehensive Due to the large difference in stiffness between the body and the bridge structure, uneven settlement will seriously affect driving safety, the original old road part also needs to be excavated and replaced with a bridge

Although this reconstruction method has completely solved the splicing problem of high fill, the cost is high, the construction is complicated, the maintenance is difficult, and the implementation is difficult.

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