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标准軌距铁路設計技术规范第201条:《隧道內部輪廓須符各現行的隧道建筑限界,考虑施工误差,并应保证在隧道中能安装通讯、信号、照明及电缆等设备。在曲线上应根据限界标准加宽。新建铁路隧道,除已确定远期不电化者外,单线应按国家标准“隧限-2甲”,双线应按“隧限-2乙”设计之。旧线单线隧道在进行电气化改建时,其限界一般应该“隧限-2甲”办理。如有特殊情况,按上述标准改建有困难者,应在初步设计文件内提出措施,经铁道部批准。》铁路隧道建筑限界是铁路限界之一种,是铁道部门重要标准之一。是根据机车车辆限界等条件制定的。为了确保隧道内行车的
Article 201 of the Technical Specification for Design of Standard Gauge Railway: “The internal contour of the tunnel shall be within the limits of each existing tunnel construction, taking into account construction errors and shall ensure that equipment such as communications, signals, lighting and cables can be installed in the tunnel. In the curve should be based on the standard limit widening. In addition to the newly established railway tunnels, the single lines should be ”Tunnel-2-A“ according to the national standard and the double lines should be designed according to ”Tunnel-2-B“. The old line of single-lane tunnel in the electrification of the reconstruction, the limits should generally be ”tunnel limit -2 A“ handle. If there are special circumstances, according to the above standards to reconstruct those who have difficulties, measures should be proposed in the preliminary design documents approved by the Ministry of Railways. ”Railway tunnel construction boundaries is one of the railway limits, is one of the important standards of the railway sector. It is based on the conditions of rolling stock and other conditions. In order to ensure traffic in the tunnel