Lake County Forest Preserve District

Middlefork Savanna Trail Connection

Making a Connection

Within the Middlefork Savanna Forest Preserve in Lake County, 一组铁路轨道服务于地铁和一些货运列车线路, prevented residential communities, Lake Forest Academy, and Townline Community Park, 从安全通道到伊利诺斯州这个专门的自然保护区的多用途步道.

A Divide that Needed Bridged

米德尔福克草原步道连接为行人和骑自行车的人创造了一个更安全的环境,提供了一条新的8英尺宽的共享使用路径,将用户群与森林保护区步道网络连接起来.  The centerpiece of the project was the new bridge, 哪个是森林湖内唯一的行人/自行车铁路通道. 步道连接也是连接更大的区域步道网络(如北岸步道)的一部分, the Des Plaines River Trail, the Skokie Valley Trail, and the Robert McClory Trail.

Civiltech provided Phase I, Phase II, Phase III, 和结构十大网络彩票平台大全作为这个激动人心的项目的主要顾问. 每个阶段都有独特的挑战,需要广泛的利益相关者协调.

This Project Incorporates the Following:

  • Reuse of historic structures
  • Multi-use path realignment
  • ADA compliance
  • Complex construction parameters
  • Metra and railroad coordination
  • Landscape preservation
  • Multiple IDOT department coordination

Scope of Services

  • Project Development Report
  • Preparation of Contract Plans, Specifications, and Estimates
  • Multiuse Bridge
  • Bikeway and Pedestrian Facility Design
  • Traffic Signal Design
  • Interagency Coordination
  • Resident Engineering
  • Construction Documentation
  • Coordination and Public Involvement
  • QC/QA Material Testing

Preserving History, Preserving Nature

湖森林学院位于前J. Ogden Armour Estate.  The former estate’s drive had come from the east, crossing the railroad tracks, and terminating at the site on the west side of the tracks.  1954年,阿默尔庄园原有的桥梁结构被拆除, however decorative, concrete, abutments remained on either side of the tracks.  Civiltech选择将新桥定位在与历史桥台相同的位置, 哪一个作为所有对齐选择的起点.

开发新路径路线的一个挑战是在满足ADA可达性要求的同时维护某些树木.  为了给铁轨西侧的小路让路,一大片树木不得不被移走. 由于树龄或大小的原因,一些树木很重要,Civiltech修改了替代品,以避免损坏或移除它们.  另一个重要的挑战是确定安全方便的地点安装新的人行横道,行人和自行车驱动装置位于轨道西侧的道路和十字路口. 新的人行横道的设计是为了容纳从住宅区到桥梁和森林保护区东侧的路径, Lake Forest Academy, and Townline Community Park located on the west side.

广泛的第一阶段利益相关者协调包括包括水力学在内的几个IDOT局, Traffic, and Geometrics.  因为这条小径的连接包括在铁轨上的一座桥, 第一期及第二期十大网络彩票平台大全均须与大都会紧密配合.


Blending the New with the Historic

Civiltech的结构工程师设计了一个新的221英尺长的桥梁结构,作为铁路连接的最后一环. The new 12-foot wide, 钢框架和木板桥被放置在与原桥相同的位置,为J. 奥格登装甲地产和被设计坐在现有的混凝土桥台.  结构工程师选择利用旧桥的混凝土桥台来保留历史美学,并参考以前的桥梁和庄园. 现有的桥台现在仅仅是装饰性的,新桥的结构基础隐藏在桥台后面. 新桥设计的一个挑战是对现有桥台的尺寸和结构支撑的关键验证.  Also, 这座桥必须被设计成五个独立的部分,以便运输到现场, with the ability to assemble the single structure in the field.


Anticipation, Coffee, and a 2 a.m. Hoist

步道和新桥的建设是分阶段进行的,这样铁路两侧的步道就完工了.  Then, in the early hours of the morning on Saturday, September 9th, 2018, before an audience of about 40 on-lookers, and with adrenaline, anticipation, coffee, and donuts holding tiredness at bay, Civiltech的驻地工程师协调了新桥结构的布置, 新米德尔福克草原小径连接的中心和最后一环. The hearty crowd that had gathered at 2 a.m. to watch the bridge erection included staff from Civiltech, Lake County, and the Lake County Forest Preserve District, as well as curious neighbors.

The planning, preparation, verification, 完成桥梁安装所需的协调是复杂和多方面的,在吊装和放置桥梁的过程中产生了巨大的期望和焦虑.   最关键的因素是与地铁的时间表协调,这决定了3小时的窗口, between 2 am and 5 am, in which the entire bridge installation needed to occur. 在紧迫的时间框架内增加了进一步的复杂性和协调性, 货运列车仍被允许通过,但对其滞留时间有限制.

Exceeding Owners Needs

莱克县森林保护区面临着从居民区安全进入米德尔福克稀树草原森林保护区和梅洛迪农场自然保护区的挑战, Lake Forest Academy, and Townline Community Park, as well as connecting regional trails, 因为铁路和60号国道为行人和自行车提供了障碍.

Civiltech的桥梁和步道连接设计为社区提供了通往Middlefork Savanna森林保护区和步道系统的安全通道. 改善为社区提供了最先进的桥梁和森林湖唯一的行人/自行车轨道交叉口, while honoring the history of the region.

Learn more about this project
and its related services.

Contact Jim Ewers