Method for treating open-to-traffic soft soil foundation bridgehead settlement through high-pressure jet grouting piles by means of embankment hole drilling

Abstract

The invention relates to a method for treating open-to-traffic soft soil foundation bridgehead settlement through high-pressure jet grouting piles by means of embankment hole drilling. The method comprises the following steps that (1) the treatment lengths of settlement highway sections on the two sides of an open-to-traffic highway bridge are determined, the treatment sections are divided into four subsections of the subsection I, the subsection II, the subsection III and the subsection IV, the subsection I and the subsection III are located on the left highway section, and the subsection II and the subsection IV are located on the right highway section; (2) the left highway section is closed, asphalt running pavements or concrete running pavements of the subsection I and the subsection II of the left highway section are cleaned, pavement bed courses and embankment filling which are located under the pavements are exposed, the part, from the shoulder to the slope toe, of the left highway section is kept in the original state, and passage of the right highway section is ensured; (3) running pavement subgrades are treated through the single-tube high-pressure jet grouting pile; and (4) after treatment of the running pavement subgrades is completed, the triple-tube high-pressure jet grouting pile is adopted for treating embankment slopes. The method has the advantages that the method is suitable for treatment of excessive settlement of bridgehead highway sections and also suitable for treatment of excessive settlement of any other highway sections of open-to-traffic highways.

Description

technical field [0001] The invention relates to a method for treating the subsidence of a bridge head on a soft soil foundation opened to traffic, in particular to a method for treating the subgrade settlement of a bridge head section on a soft soil foundation opened to traffic by using a high-pressure rotary grouting pile through an embankment approach hole. Background technique [0002] The southeast coastal area of ​​my country is an economically developed area in China, which has driven the rapid development of road engineering. However, the rivers and lakes in the southeast coastal area are criss-crossed and the weak soil is widely distributed. It is difficult for most road construction to avoid these complex and weak soil layers. A road Many rivers are often crossed, so many road bridges are required. In actual highway engineering, these highway bridges can often meet the design requirements, and almost no settlement occurs. However, there are often deep soft soil layer...

AI Technical Summary

Problems solved by technology

The opening of highways will usually lead to the rapid development of a region's economy. Once the traffic is closed for some reason, it will inevitably cause incalculable economic losses in the region and seriously affect the development of the local national economy. However, when solving such problems in practice, there is a lack of a Feasible, effective, and scientific technical means are used to deal with it, so many bridgehead settlements will still occur again after treatment, which is difficult to cure

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