浅析高速公路建设企业如何做好新闻宣传工作

文章基于高速公路建设发展实际,分析了新闻宣传工作在提升高速公路建设企业软实力中的重要作用,指出新闻宣传工作必须做到"快、准、宽、精"四字要诀,阐述了做好高速公路建设新闻宣传策划工作的具体思路。     

大连至庄河高速公路就地热再生技术的应用

大连至庄河高速公路在维修养护中,对路面轻度破损路段采用了就地热再生技术,通过对原路沥青混合料抽提筛分,确定了新加沥青混合料级配和再生剂用量,并通过合理的施工组织,利用热再生机组恢复了路面良好的使用性能,路面性能检测结果表明就地热再生技术可以用于高速公路的维修施工。     

软土地基上高速公路路基扩建加宽中的关键问题

随着交通量的迅速增长,部分建成通车的高速公路又面临着扩建加宽的问题。在软土地基上,高速公路路基的加宽工程要考虑路基的整体稳定和差异沉降问题。因为新路基的建设会引起路基边坡失稳和新老路基的差异沉降,所以软土地基上高速公路路基加宽的关键问题就是如何减小新老路基之间的差异沉降,并保证新老路基之间的有效连接。本文就此问题进行回顾和总结,并在此基础上提出几点建议。     

General Construction Technology Scheme of Tianshan Shengli Tunnel on Urumqi-Yuli Expressway北大核心CSCD

With a total length of about 22 km, Tianshan Shengli Tunnel on Urumqi-Yuli Expressway is currently the longest expressway tunnel under construction in the world. It adopts the construction scheme of 3 tunnels (2 D& B main tunnels and 1 TBM-driven middle pilot tunnel) + 4 shafts, which is characterized by great construction difficulty and high technical standard requirements. The tunnel construction is faced with technical challenges such as TBM passing through large fault fracture zones, long-distance construction ventilation in three tunnels, deep and large shaft construction and logistics organization in two-main tunnel construction assisted by middle pilot tunnel. In the parallel three-tunnel method design of Tianshan Shengli Tunnel, the TBM-driven middle pilot tunnel can not only play the role of advanced pilot tunnel, but also assist the construction of the two main tunnels and speed up the construction progress. For the middle pilot tunnel, the TBM excavation diameter is 8.4 m, and the initial support is designed as 100% force-bearing capacity in construction period, which can meet the requirements for two-way material transportation, ventilation and belt mucking in the pilot tunnel. Vault suspension scheme is adopted for the continuous belt conveyor, which can reduce the impact on the material flow organization in the cross passages. Multifunctional service vehicles (MSVs) independently developed by CCCC Group are used for the transportation of TBM materials and prefabricated inverted arch blocks, which can realize double-headed driving. TBM will pass through two large fault fracture zones F6 and F7. According to the stability of the surrounding rock at the tunnel face, the targeted treatment measures would be adopted. If necessary, the scheme of steel segment + extruded concrete shall be used for the initial support. In case of serious machine jamming or rock collapse, the heading expansion excavation method or bypass heading method shall be used. Tianshan Shengli Tunnel adopts phased forced ventilation option, and the ventilation mode is designed in stages with the change of tunnel construction stage. The fans and air pipes used are imported ones, and a ventilation management team is set up to strengthen ventilation management and ensure ventilation quality. Highly mechanized construction is used for the two D& B main tunnels, the application of equipment such as three-arm rock drilling jumbo and wet shotcrete machine is promoted, so as to reduce the number of workers and labor intensity, and improve work efficiency. The deep shafts of Tianshan Shengli Tunnel are constructed by short-section excavation and lining mixed operation method, and the initial support is lined by formwork pouring concrete, so as to realize safe and rapid excavation. According to the research results, the construction technology scheme for Tianshan Shengli Tunnel can meet the needs of tunnel construction. The research results can be directly used to guide the construction of Tianshan Shengli Tunnel, and provide reference for the construction of extra long highway tunnels in high-altitude areas. © 2022, Editorial Office of Modern Tunnelling Technology. All right reserved.     

共振碎石化在惠盐高速深圳段改扩建工程中的应用

惠盐高速作为广东地区最早一批建成通车项目,自1994年建成运营,其交通区位优势显著,是深圳地区前往粤东和江西等地最方便的道路,同时也是深圳去往惠州最便捷的通道.结合当前对旧水泥混凝土路面的多种处治方案,综合比选,选取共振破碎后加铺沥青面层为推荐方案,可很大程度的减少建筑垃圾,减少废弃材料运输问题,降低了车辆尾气污染问题...