铁道建筑

京津城际铁路K8+900—K9+000段为桥上CRTSⅡ型板式无砟轨道结构,该段上下行线出现3处轨道板拱起,轨道板板端与砂浆层间离缝最大达到18 mm,列车通过时有明显空掉现象,严重影响轨道平顺性和列车运行安全。现场检查分析发现,在温度力和列车制动力作用下,简支梁或连续梁梁端附近钢轨和轨道板附加力较大,导致轨道板和砂浆层脱离,进而出现上拱现象。整治方法:首先,在轨道板纵连锁定温度范围内对上拱轨道板进行应力放散并重新锁定;其次,下压上拱的轨道板并锚固;最后,采用低黏度树脂材料对砂浆层离缝进行注浆修补。

CRTS Ⅱ slab ballastless track was used on bridges in K8 + 900—K8 + 000 section of Beijing-Tianjin intercity railway line. The maximum gap between the end of slab and mortar layer of three delaminated track slabs in double lines was 18 mm,and the track slabs were obviously upheaved under moving trains; thus,the irregularity of tracks may threaten the operation. The field investigation shows that the large additional force of rail and slab near the end of simply supported beam and continuous beam under the effect of temperature and train-induced dynamic load results in separation of slab and mortar,even upheaval. Treatment measures were proposed in this paper. First of all,the upheaval track slab was stress released and relocked in the locked temperature range of longitudinal connected ballastless track. Secondly,the upheaval track slab was pressed and anchored. Finally,mortar layer gap was grouted with the low viscosity resin.