Reinforcing construction method of existing railway subgrade

Abstract

The invention provides a reinforcing construction method of an existing railway subgrade. The method comprises the following steps of: positioning an aiguille on a subgrade slope, wherein the aiguille is peripherally provided with at least one stretchable helical vane; drilling by adopting a rotary drilling mode, and crushing a soil body around the drilling hole by the helical vane which extends from the aiguille when the aiguille drills to a preset depth; drilling to a preset depth; injecting slurry by utilizing a drilling rod while keeping the helical vane to stir the soil body after drilling is finished and also lifting the aiguille to the opening; and repeating the steps until forming needed injection stirring piles in a grid distribution. According to the method of the invention, a reinforcing body can be rapidly reinforced under the condition that train operation is not influenced. In addition, the method also has the advantages of reliable reinforcing quality, simpleness and convenience for construction and less environmental pollution.

Description

Technical field [0001] The invention belongs to the technical field of road construction, and more specifically relates to an existing line foundation strengthening construction method. Background technique [0002] Due to the limitation of the technical and economic conditions during the construction of the existing line foundation, the filling and compaction standards are often low. With the increase of passenger and freight traffic and the axle load of rolling stock, the existing line foundation is prone to various diseases such as mud-turning, sinking and external crowding. These diseases have seriously affected the stability of the line, increased the workload of railway maintenance and repair, and shortened the service life of the track superstructure. They are the main reasons that affect the safety of railway transportation and hinder the improvement of railway transportation capacity. [0003] In the case of train speed increase and load increase on existing lines, subgra...

AI Technical Summary

Problems solved by technology

However, the construction of the horizontal jet grouting pile method is difficult, and due to the nozzle pressure and uneven soil quality, it is easy to cause uneven pile formation, the diameter of the jet grouting pile is difficult to meet the design requirements, and the strength of the jet grouting pile increases slowly.

Especially for subgrade fillers with high compaction, dense to medium dense sandy soil, and large-sized pebble formations, the amount of slurry emitted by the rotary grouting piles is large, which wastes cement and affects the environment. At the same time, the strength increases slowly, which will Affect the normal operation of the line

In addition, the mixing pile is inconvenient to operate due to insufficient mechanical power and the vertical driving of the machine is affected by its height. At the same time, it cannot adapt to the above-mentioned specific roadbed conditions.

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