Soft foundation reinforcing method of existing railway or highway subgrade construction

Abstract

The invention relates to a soft foundation reinforcing method of the existing railway or highway subgrade construction, which comprises the following steps of: constructing vertical chemical churning piles on the side slope and the slope toe of a subgrade to be reinforced; after the vertical chemical churning piles are cured, drilling a plug hole tilting toward the center line of a track and extending into the soft foundation in the side slope by using a drilling machine; and performing shock tube grouting in the plug hole. A sizing agent in the plug hole permeates towards the periphery of the foundation, the cured sizing agent, the vertical chemical churning piles and the foundation form an integrated reinforcing block, and thus, the reinforcement of the railway or highway subgrade construction is completed. Compared with the traditional single technique, the method has the advantages of no construction transition, no traveling interruption and no reinforcing dead zone by adopting the vertical chemical churning piles together with a shock tube grouting technique. The advantages of both the vertical chemical churning piles and the shock tube grouting technique are fully exerted, and the safety and the quality are controllable.

Description

technical field [0001] The invention relates to the technical field of railway construction, in particular to a method for reinforcing weak foundations of existing railway and road subgrade projects. technical background [0002] At present, when the existing railway and road subgrade projects are upgraded on weak foundations, or when the existing subgrades have problems such as excessive settlement and instability, construction convenience lines are generally used for temporary transition to ensure normal transportation, and then the existing The subgrade should be excavated and replaced or ground reinforcement treatment. In this case, the ground treatment measures are more selective, have many schemes, and are easy to implement. However, for urban areas or when there is no transitional condition for construction lines, and the normal operation of vehicles cannot be interrupted during the construction process, conventional foundation treatment measures are difficult to meet...

AI Technical Summary

Problems solved by technology

However, for urban areas or when there is no transitional condition for construction lines, and the normal operation of vehicles cannot be interrupted during the construction process, conventional foundation treatment measures are difficult to meet the requirements, either because the construction equipment has a large operating space that affects driving, or there are reinforcement blind spots and Influence the reinforcement effect, reduce post-construction settlement and safety and stability coefficient

Images