国道110线包头北绕城段公路单喇叭互通立交选型研究

Study on Selection of Single-horn Interchange for Baotou North Beltway Section Highway in National Highway 110

由于B型单喇叭互通立交在主线车辆高速驶入低速环形匝道,同时A匝道上跨的情况下,主线车辆驶出环形匝道视距不良,因此我国绝大多数单喇叭互通立交采用A型。依托国道110线包头北绕城段公路工程实例,结合交通量、平纵线形、视距等方面因素,对A型、B型单喇叭互通立交的工程适用性进行了详细分析,并对具体方案进行了比选。总结认为,在主线左转驶出流量不大、A匝道下穿主线不影响驶出匝道视距等情况下,B型单喇叭立交型式并不劣于A型单喇叭立交型式。

Because of Type B single-horn interchange where the main line vehicles highly speed into the low-speed ring ramp,also under the condition of On-ramp A,the sight distance of main line vehicles leaving ring ramp is bad.Therefore,the most of single-horn interchange adopt Type A in China.Relying on the case of National Highway 110 Baotou North Beltway Section Highway Project,combined with the traffic flow,plat and vertical linear,sight distance and the other factors,the engineering applicability of Type A and Type B single-horn interchanges is analyzed in detail.The specific scheme is compared.The conclusion shows that Type B single-horn interchange is not inferior to Type A single-horn interchange in the case that the leaving flow of the main line on the left turn is not large and the main line of Off-ramp A does not influence the sight distance of ramp.