Construction Technology for Stress Dispersion Inside the Skylight Point of Seamless Turnout in High-speed Railway
The laying of seamless turnout should ensure that the construction locking rail temperature is within the allowable range of the design requirements.If the upper or lower limit of the design locking rail temperature is exceeded,the stress dispersion should be carried out.The inconsistency between the turnout and the line is that the position of the turnout frog is fixed,and in principle,no stretching is carried out.During the laying of turnouts in summer,natural release can be carried out at night under appropriate rail temperature.In winter,the highest rail temperature affected by ambient temperature cannot reach the design rail temperature,while some stations are affected by factors such as joint commissioning and opening,and natural dispersion should be carried out in the skylight point after opening.Combined with the influence of the demolition of Beijing Fengtai Station of Beijing-Hong Kong High-speed Railway,the concrete pouring of the elevated platform was completed in January 2022.The turnout laying was laid in the low temperature season,and the design locked rail temperature could not be achieved.Temporary rail temperature locking was adopted.After the ambient temperature and rail temperature rose to the design locked rail temperature during the joint adjustment period,the free dispersion was carried out within the joint adjustment skylight point,and finally the design locked rail temperature was achieved.
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