A Study Of The Construction Technology Of Application Of The Subgrade Treatment Vehicle To Treat Subgrade Defect

The railway subgrade can resist train loads passed by roadbed, weaken the dynamic stress of trains and transfer train loads and partial dynamic stress to ground or embankment. Sbugrade must keep enough strength, stability, track geometry, and good drainage so as to keep the subgrade drier. But the function of subgrade is weaken by the subgrade defect such as mud-pumping, subgrade subsidence, the crowded deformation and so on. Subgrade defect must be eliminate in time to make sure that the railway is in good condition and the train is safe, steady, comfortable and punctual.In recent years, with the development of heavy haul railway technology, the increment of mileage with speed up, and the improvement of traffic density, there is a significant change in railway subgrade load, involving distribution and the way of action of the internal stress, meanwhile, new subgrade disease is spring up, and the original disease becomes more terrible because of the filler and low structural design standards and construction quality, it is reported that more than 8 percent of railway exists a variety of subgrade disease.Our traditional treatment of subgrade defect in railway basically depends on manual labour, leading to low mechanization and being difficult to guarantee the quality of construction work. With the restrictions on track window time and yard, the depth of the subgrade bed is limited, usually only about 0.3m; operation efficiency is low and the manpower cost is higher; moreover, because of higher construction safety risk, difficulty in safety control becomes larger.The thesis summarizes the classification, reasons and treatment of common subgrade defect in our country such as mud-pumping, subgrade subsidence, the crowded deformation, frost injury and so on.The structure of the subgrad treatment vehicle, operation principle, operating condition, performance characteristic and the effect are elaborated in this thesis.Take the procedure and construction scheme of the application of the subgrad treatment vehicle to treat subgrade defect for the first time in our country for example, the main technical requirement, the quality standard, the track window time and the conditions of speed restriction while treating subgrad defects by the subgrad treatment vehicle are summarized. The thesis also summarizes the construction scheme included the operating trains and train crew cars marshalling, the main machines, the labor organization, the scheme of operating process, the division of work of different departments, the safety measures and the prediction scheme of emergency treatment.The construction technology of treating subgrade defect by the subgrad treatment vehicle, the preparation work of construction,the plan and method of construction,the defect of vehicle and the track window time are studied in the thesis. It is also explored how to increase operation efficiency and improve the construction quality in the thesis. According to the features of railway transportation and construction in our country, the effect of the subgrad treatment vehicle should be exerted by the greatest extent in order to make sure that the design requirements of operation efficiency and construction quality are fulfilled.