公路装配式涵洞运输阶段的稳定性分析

Stability Analysis of Assembled Culvert in Highway Transportation Stage

为降低装配式涵洞预制构件运输过程中滑移、倾倒风险,解决运输过程中的稳定性问题。本文通过对装配式涵洞在加减速、上下坡、转弯路段等不利工况进行分析,建立了加减速、上下坡、转弯路段运输过程中的力学模型,量化了装配式涵洞在加减速、上下坡、转弯路段的临界稳定状态控制指标,并提出了保证装配式涵洞侧墙及顶板运输稳定的工程措施。研究结果表明:为保证装配式涵洞的预制侧墙及顶板运输稳定,在运输的加、减速阶段,建议平地最大加速度不超过2.9 m/s^(2);在运输的上、下坡阶段,建议最大爬坡角度不超过16°,最大加速度不超过1.0 m/s^(2);在转弯运输阶段,建议选择路线时,转弯半径控制在60~100 m,行车速度不超过9 m/s,这样既能通过特殊路段,又能保证运输效率。通过上述运输要求,确保了项目6座装配式涵洞预制构件在运输过程中的安全稳定,提高了经济效益。

In order to reduce the risk of slip and tipping in the transportation process of prefabricated culvert members,and solve the stability problem in the transportation process. Based on prefabricated culverts deceleration,downhill,turning sections such as adverse condition analysis,this research established the mechanical model in the process of deceleration,downhill,turning of road transportation,quantified the critical stable state control index on the deceleration,downhill,turning section,and puts forward engineering measures to guarantee the stability of prefabricated culverts side walls and roof transportation. The results show that in order to ensure the transportation stability of prefabricated side wall and roof,the maximum acceleration on the ground is recommended not to exceed 2.9 m/s^(2) during the acceleration and deceleration stages of transportation.In the uphill and downhill stages of transportation,it is recommended that the maximum uphill angle should not exceed 16°,and the maximum acceleration does not exceed 1.0 m/s^(2). In the stage of turning transportation,it is recommended that the turning radius should be controlled within 60 ~ 100 m and the driving speed should not exceed 9 m/s,which can not only guarantee passing special sections,but also ensure the transportation efficiency. Through the above transportation requirements,the safety and stability of the transportation process of the 6 prefabricated culverts in this project are ensured,and the economic benefits are improved.