A Lightweight Settlement Control Method for Existing Expressway or Railway Embankment

Abstract

The invention discloses a light-weight settlement control method for an existing highway or railway embankment. Steps are excavated on both side slopes of the road as a construction platform; drill holes are arranged in the construction area; the drill holes are drilled into the embankment according to a certain oblique angle ;During the drilling process, the soil is automatically discharged from the spiral drill pipe; after the drilling is completed, the PVC pipe is injected; the PVC pipe is filled with bagged sand, and the exposed end is covered with a PVC pipe; the drilling of the entire construction section is completed Replacement; use light soil to backfill the slope and re-protect the slope; according to the actual situation of differential settlement of the road, take out the backfill sand filled in the PVC pipe at regular intervals to achieve the effect of controlling settlement. The invention can be opened to traffic normally during construction, and the drilling has less damage to the road surface structure layer, and the replacement of the embankment fill by the PVC pipe has the effect of reducing the weight of the embankment, and greatly reduces the post-construction settlement of the embankment. The invention has the advantages of concise construction process, convenient construction, high cost efficiency and good implementation effect.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and traffic engineering, in particular to a method for controlling the lightweight settlement of an existing expressway or railway embankment. Background technique [0002] my country's highway construction is developing rapidly, and most of my country's highways are located in the eastern coastal areas, and there are a large number of soft soil foundations in the eastern coastal areas, so the problem of highway foundation settlement needs to be solved urgently. In the construction of expressways in soft soil areas, it is necessary to solve the problem of uneven settlement of the roadbed, especially at the bridgehead position. my country's "Code for Design of Highway Subgrade" (JTG / D30-2004) stipulates that the post-construction settlement of the general road section is less than 30cm, the post-construction settlement of the bridge head transition section is less than 20cm, and the post-...

AI Technical Summary

Problems solved by technology

If the road surface of the expressway is not smooth enough, it will affect the driving comfort

At the same time, the impact force when the vehicle is driving is likely to cause a vicious circle, the cost of road maintenance is very high, and it affects driving safety

Existing highways in soft soil areas are prone to long-term deformation, and the differential settlement continues to increase, which affects the normal use of highways

In the design scheme, the filling density of the embankment is relatively high, and the road foundation bears the upper load for a long time, which will easily cause large settlement. Especially for the foundation treatment methods of structures, transition sections and general road sections, large differential settlement will lead to pavement damage.

[0004] Before the present invention, the method of dealing with the settlement of the existing soft soil expressway was to lay pavement materials to fill up the subsidence part, so that the pavement can be leveled, but the pavement materials have the following disadvantages: the paved materials have a large bulk density and are applied to the embankment as a permanent load , new additional stress will be generated in the soft soil foundation, which will further cause the foundation settlement. After the foundation settlement, the road surface will have differential settlement again, and the pavement material needs to be paved again, which will generate new loads and form a vicious circle. Therefore, this method It is a palliative, not a permanent solution, and cannot fundamentally solve the problem of road settlement, and requires a lot of road maintenance costs

However, due to the high filling height of embankment at the bridge head and other road sections prone to differential settlement, the construction period of re-strengthening the foundation is long and the cost is high, which affects the normal opening of the road. It is not an economical and efficient foundation treatment method

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