在2019年交通研究委员会年会上, a presentation on Building Information Modeling trends in transportation engineering highlighted the 伊利诺斯州收费公路 as an industry leader in 3D project deliverables. The specific project featured was the 里根纪念堂收费公路(I-88) 在中线47号公路交汇处 for which Civiltech provided the design engineering. The Tollway initiated the idea of a 3D deliverables pilot project to observe and analyze the process, 识别的挑战, and determine changes to policy or approach that may be needed to more fully implement 3D deliverables in the future.
- Tollway ramp, roadway, drainage, 标志, 路面标记 design
- Collaborative modeling resulting in deficiency mitigation
- Preparation of Contract Plans, Specifications, and Estimates
The scope of the pilot project included completing the I-88 and IL Route 47 Interchange design based on a recently completed Phase I study. The improvements included reconstruction of two existing ramps, 兴建三个新斜坡, 两个收费站, IL 47号公路和桥面铺装的重建. Civiltech’s scope of work included ramp and roadway design, 以及排水系统, 标志, 路面标记, 项目管理, and overall project coordination with subconsultants and other ongoing mainline resurfacing work.
The Tollway was familiar with Civiltech’s 3D modeling capabilities and chose this specific project due to certain parameters. 主要是, the project location is more isolated than many Tollway projects, so it did not have some of the complexities created by overlap with other contracts. 也, limited bridge work reduced structural engineering and maintenance of traffic requirements that would have affected the complexity of the model.
The project involved a significant amount of earthwork which also made it ideal for this initiative. A benefit of utilizing a 3D model within the contract documents is that the extent of earthwork can be closely quantified and those quantities can be verified during bidding. 随着项目进入构建阶段, the model will be beneficial to the contractors involved in earth moving.
A design challenge that Civiltech faced was buttoning down the final project details. Three dimensional modeling in the civil engineering industry includes more complexity than the modeling involved in building design. A 3D model of a roadway reconfiguration requires aligning a multitude of different existing conditions that tie into the project. Sometimes nuances exist that are difficult to capture within a 3D model. Those nuances would normally be addressed through two dimensional details such as cross sections. 最终交付的是3D模型, those issues needed to be fully resolved within the model
As Civiltech and the industry move further into the use of 3D models as contract documents, our clients and stakeholders will benefit from many potential advantages. 首先,也是最重要的, the contractors can clearly understand and visualize a project’s many parameters allowing them to estimate the project more quickly and build it more accurately. The model realistically illustrates what the final product will look like and how it integrates with the existing conditions that surround it. 也, 一个3D模型将提供给客户端, 施工经理, and contractors with a level of precision and detail that might normally be difficult to capture in a traditional plan set.
Another benefit of 3D project deliverables is that agencies will gain a significant amount of data useful to their asset management. All components of the agency’s infrastructure can be captured in an overall comprehensive model instead of stacks of plan sets. Whether needed for emergency situations or routine maintenance, accurate historical data and as-built information will be easily available.
在设计过程中, Civiltech and their subconsultants were able to simultaneously work in the model. This created a collaborative environment where the entire team was able to identify and evaluate problems as they occurred. Mitigating deficiencies during the design process helped to minimize unforeseen problems that could result in change orders during construction. 这同样适用于机构评审和投标. 通过能够在3D中看到所有的信息, issues can be identified and remedied that may have previously not been discovered until the project was under construction.
Both Civiltech and the Tollway consider the outcome of this phase of the project a success. 然而, both are looking forward to further analysis of the processes and lessons learned when construction has been completed having incorporated the 3D model into the contract documents.