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

摘要:

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。

Abstract:

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.