The Technology And Applications Of Advanced Shallow Mining Method Pre-Consolidation

In recent year, with the development of urban rail transit, the subway project is increasing. Generally, in urban underground engineering has shallow burial depth and poor geological conditions. More and more projects be constructed by Shallow Mining Method. During the Construction process, it is likely to cause surface subsidence great. When the tunnel or underground approaching or passing through a pipelines or important structures, the allowed settlement of the underground is very strict. So the process impact of driving tunnel construction must be strictly controlled. In the Steps of driving tunnel, pre-reinforcement technology is a key step to ensure the safety of tunneling construction.Based on the extensive research, indepth study of the Shallow Mining Method construction technique especially Shallow Mining Method Pre strengthening technical points, completed the following research areas:1. Described a variety of pre-reinforcement technique Features of Shallow Mining Method, from the construction technology, construction costs and construction detailed, the effect of horizontal rotary jet pile Pre- consolidation, bassoon studio pre-strengthening technology and pre-grouting reinforcement technology are Comparative analysised.2. According bassoon studio Consolidation Technique and Grouting Reinforcement Techniques, proposed bassoon studio + Improved Sleeve valve pipe Grouting reinforced technology. Through the bassoon studio and Reconstruction Design sleeve valve tube, Setting the registration plate in aperture segment, check valve in the pipe steel pipe shed, and connected to the self-advancing drill pipe and pipe roof welded directly, effectively improve facilities for pipe roof accuracy and ensure good grouting, reducing the probability of not enough time since the grouting filling holes caused by collapse, simplify procedures, improve efficiency.3. Setting modified sleeve valve tube over the pipe roof, Using φ42(external) × 3.25mm(thickness) steel as grouting pipe, in order to ensure no anti-pulp, at the end of the grouting pipe should not leave 800 mm Hole, and laying 200 mm exposed. Before grouting pipe Oxfam stick "two brothers good" glue grouting hole cover with Φ6 ~ 8mm small aluminum, and transparent taped to prevent dirt in the grouting pipe when applying for grouting core tube can not enter the tube.4. The specific research on Shallow Excavation Construction Technology Scheme and construction monitoring technology are done base on the specific projects.5. Combined with the implementation process of that Guangzhou Metro Line station new gold Shallow Mining Method Consolidation Technique, summed up the construction effect, formed national construction method and related patents results, provide a reference for similar projects.