埋管水热式融雪系统对桥面铺装结构的影响

Effects of snowmelt system with hydrothermal buried pripes on bridge paving

为研究车辆荷载对埋入水热管桥面铺装层的影响,结合依托工程,采用有限元程序,建立了数值计算模型,研究了不同埋管间距、埋深、超载等因素对桥面铺装层结构的力学影响。研究结果表明:埋管间距与埋深对桥面铺装沥青层的影响较小;影响管网应力的首要因素为管网埋深,在满足热力学要求的前提下,可适当加大管网埋深,增大管网间距;超载条件下,轴载从100kN增加到200kN,在埋深较浅和埋管间距较小的情况下,管网可以承受桥面超载引起的等效应力的影响;综合考虑导热融雪效果、管网受力、施工、经济等多方面因素,推荐管网埋深2cm,管网间距15cm。从铺装层结构受力角度提出埋管式桥面融雪系统管网布设方案。

In order to know the influence of vehicle load on the deck of snowmelt system with hy- drothermal buried pipes, a numerical computation model was established in combination with a practical project by use of finite element method to study the mechanic effects of factors like dif- ferent pipe spacing, depth and overload on the structure of bridge deck with buried pipes. The re- sult shows that the pipe spacing and depth have little effects on the deck asphalt pavement. The primary factor affecting the stress of the pipelines is buried depth. To meet the requirements of thermodynamics, it＇s appropriate to increase buried depth and pipe spacing. In overload condi- tions, as the axle load increases from 100 kN to 200 kN, the pipeline can withstand the equivalent stress caused by overload from the deck when buried depth and pipe spacing are small. Syntheti- cally considering the factors such as snowmelt effect, pipe stress, construction and economy, it＇s suggested that pipe spacing be 15 cm, and buried depth be 2 cm. The layout scheme of bridge deck snowmelt system with hydrothermal buried pipes is put forward from the perspective of the force structure of the pavement. 3 tabs, 12 figs, 15 refs.