The vibration control method of the vibration-sensitive N10 section in TIAA MRT Taipei Main Station (A1) adopted steel springs to support a long section of floating slab track which is inclusive of plain lines, left & right hand turnouts, diamond crossing, etc. Each steel spring unit consists of a sleeve unit and a spring unit. To install the steel spring unit, first, set the sleeve unit into the concrete slab of the floating slab track; then, insert the steel spring unit into the sleeve and apply pressure by a hydraulic jack to the spring until it reaches the desired height.
By adopting the Steel Spring System-GERB, the dynamic requirements (natural frequency) of 8Hzfor the N10 floating slab tracks can be met. The natural frequency of N10 floating slab track is relatively low, so the relative displacement of neighboring slabs may be too large during operation of trains causing the steel rail and fastening system pressures to exceed acceptable levels. Therefore, the auxiliary rail system was adopted to connect neighboring slabs which will enhance its vertical strength and ensure the stability and safety of train operation.
The N10 section includes 1,076m of tangent rail, 8 turnouts and 1 diamond crossing. The rail profile structure from the tread surface down includes steel rail, fastenings, twin-block sleeper, vibration-isolating sleeve, scaffolding concrete slab track, buffer stop, auxiliary rail and track panel assembly. The main construction procedures are (in order): measurements and setting, buffer stop installation, track panel assembly, base dowel installation, isolation cloth installation, housing installation, reinforcement banding, auxiliary rail pre-burying parts installation, moldboard assembly, concrete pouring, interior film assembly of protection curb, protection curb pouring, interior sleeve installation and jacking of spring unit, auxiliary rail locking, etc.
The rail constructor of ME01 Tender has commenced construction since Jul. 30 2013. By Jan. 8, 2014, the rail bed concrete pouring procedure was completed and by Apr. 15, the normal track installation and turnout lifting processes were also completed. Finally, by Apr. 29, the remaining construction items such as thermit welding and buffer stops installation were all completed.