Rapid repairing method for sunken ballastless track through grouting lifting

Abstract

The invention relates to a rapid repairing method for a sunken ballastless track through grouting lifting. According to the method, grouting materials, device tools and a construction technology are needed, and the method specifically comprises the steps that after lifting quantity of the ballastless track is determined, a high-pressure grouting device is adopted, and under certain grouting pressure, rapid-hardening grouting materials are grouted under a ballastless track base which is horizontally arranged in advance and in grouting bags in a graded broken stone surface layer through a grouting pipe in a certain sequence; in the grouting process, an electronic level precise measurement device is adopted to monitor elevation changes of the upper portion of the track in real time, when the elevation is close to or reaches the designed elevation, grouting lifting is stopped, then rapid-hardening grouting materials with high fluidity are directly grouted in the gap between the lifted base and the graded broken stone layer, the grouting materials rapidly and fully fill the gap and are solidified, the lifted base and the graded broken stone layer are integrally bonded, and the ballastless track is precisely lifted and firmly located.

Description

technical field [0001] The invention belongs to the technical field of maintenance and repair of ballastless tracks of high-speed railways, and in particular relates to a rapid repair method for lifting ballastless tracks by grouting for subsidence. Background technique [0002] Ballastless track is the most advanced track technology in the world today, and it is the main track structure type used in the construction of high-speed railways in my country. my country's new Beijing-Tianjin, Shanghai-Hangzhou, Shanghai-Nanjing, Wuhan intercity, Zhengxi, Wuhan-Guangzhou, Beijing-Shanghai, High-speed railways such as Harbin-Dalian, Jingshiwu, Hangzhou-Ningbo, Ninghang, Hefu, Jinqin, Shanghai-Kunming, Lanxin, Haqi, Ning'an, Zhengxu, Shendan all use ballastless track type. Ballastless track has technical advantages such as high smoothness, good stability, long service life, good durability, and less maintenance workload. Settlement requirements are very strict. The post-construction...

AI Technical Summary

Problems solved by technology

However, after increasing the adjustable amount of the fastener system, the pads of the fastener system need to use integral pads to maintain the stability of the track structure. Due to the different settlements in different locations, the overall pads used in each fastener system The thickness of the fastener system is not the same. In this way, different overall pads need to be molded separately, which is costly. In addition, the increase in the adjustable amount of the fastener system is limited. For the track structure that continues to sink with the extension of operation time , this approach also has limitations

Another method is to use ordinary cement-based materials for grouting. This method has problems such as uncontrollable expansion of the grout at the bottom of the ballastless track, slow strength development, poor lifting effect, and difficulty in achieving accurate and rapid lifting of the track structure.

[0005] Aiming at the disadvantages of the above two methods, the experimental research on the rapid repair technology of ballastless track settlement disease has been carried out at home and abroad, but it is still in the stage of experimental development. System and method (201310027717.0)", which only provides a lifting method and grouting sequence of ballastless track structure, does not involve lifting precision control technology, and the work efficiency is low, which is not suitable for completing the repair work within the skylight time; while the patent " High-speed railway ballastless track lifting polymer grouting method (201310123669.5)” has not yet been reported on the application, and from the construction technology point of view, it is not conducive to filling the grouting material fully, and is not conducive to the completion of the repair work within the skylight time

At the same time, the above two patents do not involve the difference in the process of lifting the ballastless track in the straight section and the curved section, and the grouting materials used in the two patents are high polymer materials with expansion properties during reaction. On the one hand, the cost of this material is relatively low High, which is not conducive to large-scale engineering applications; on the other hand, its physical and mechanical performance indicators such as stiffness and elastic modulus are quite different from those used in ballastless track structures such as concrete and graded gravel, which may cause stress on the track structure. Adverse effects; In addition, the above two patents are not suitable for lifting and repairing large subsidence lines

Images