Institutional

University of Minnesota Main Energy Plant

2012年，明尼苏达大学决定复活旧的主要供暖厂，这是一个由1912年建造的蒸汽发生厂，在密西西比河银行的前石灰石采石场，进入了新的和创新的东西。在其几十年的使用中，该设施经历了几种装修来解决大学的增长。However, the Old Main Heating Plant’s latest iteration would be the most impressive: retrofitting an outdated steam plant that once used seven coal and gas-fired boilers to generate steam into an efficient, state-of-the-art, combined heat and power plant. With the installation of a jet engine-driven turbine and a massive heat recovery system, the Main Energy Plant would address the University of Minnesota’s increased demand for power and steam and help the university progress toward its goal of reducing campus emissions by 50 percent by 2020.

Environmental Assessment and Remediation at Old Main

To embark on this energy-efficient expedition, the university first needed to address the hazardous materials inside the main building, the adjoining decommissioned incinerator building and pump houses, and the impacted soils throughout the site. Braun Intertec was retained by the University of Minnesota to help with the assessment of hazardous materials and abatement of the Old Main facility, including the incinerator building. Outside, Braun Intertec worked with the university to prepare the environmental response action plan/construction contingency plan to address the known and unknown impacts throughout the site.

Ultimately, the overall environmental remediation project removed asbestos-containing thermal insulation from the seven boilers and their associated piping; recovered over 500 pounds of liquid mercury from the antiquated heating equipment control panels and other instruments; removed nearly 10,000 square feet of mercury-catalyzed polyurethane flooring; removed lead paint; demolished the former incinerator facility which also contained ash from burned medical waste; demolished two former pump house buildings which also required the recovery of a large volume of fuel oil and landfilled thousands of tons of impacted soils as the site was regraded to support a new access road. Throughout the site grading effort, Braun Intertec was retained to provide the full-time observations as the impacted soils were remediated and other environmental impacts were addressed.

Laying the Groundwork: Geotechnical Evaluations

在建设主要能源厂和安装新的同一系统的安装之前，大学及其设计团队需要更好地了解该网站的土壤和地下水条件。作为该项目的岩雷竞技的电竞比分网土工程师，Braun Intertec对网站上过去的评估进行了广泛的历史追查。雷竞技好Newbee赞助商这篇综述导致开发最终的岩土工程，以解决组合的热量和电厂内的新功能以及新的通道道路的建造，这取代了难以导雷竞技的电竞比分网航的交换机和巨大的挡土墙支持密西西比河和采石场创造的石灰石和土壤虚弱。在建筑物内，评价显示，可以使用砂岩基岩的高容量扩散基础的组合，其中需要旧河流通道的浅层浅而深入微观。

New Tricks for Old Structural Steel

一次the geotechnical review was complete, the project advanced to the renovation of the Old Main facility. One of the many challenges that surfaced during this project was concern that the 1910 era structural steel may not be weldable as new structural steel was added to the plant. Fortunately, Braun Intertec had just finished working with similar era structural steel on theUniversity of Minnesota’s Northrop Auditorium renovation project，校园里的另一个历史上很重要的结构。雷竞技好Newbee赞助商Braun Intertec最终实现了一个测试计划，知识从俄罗斯州礼堂项目收集到焊接问题。该测试程序发现旧结构钢的化学化妆品与现代焊接技术不兼容。如果暴露在焊接中，旧钢将变脆并失去承载能力。为了保持旧主楼的结构完整性，我们的工程师与设计团队合作，开发出螺栓固定在旧钢制细节的现代板块，以便将新的结构钢添加到内部。

Braun Intertec和建筑团雷竞技好Newbee赞助商队面临的另一个挑战是，建筑物的后壁在1911年倒在旧采石场的脸上。布朗Intertec使用混凝土取芯器通过混凝土墙来核心，结果高达四英尺厚。通常，在墙后面发现了一个空隙。将一台小型摄像机插入核心孔中以录像到墙壁上的空隙和背面的条件，然后再重新密封另外100年左右。

Keeping It Up to Code: Special Inspections and Testing

The plant, constructed under the guidelines of the Minnesota State Building Code, also required special inspections and testing. Braun Intertec was retained to provide these services which included soil testing, concrete testing, reinforcement placement observations, structural steel observations and testing, micropile installation observations and testing, structural masonry observations and testing, shotcrete observations and testing, post-installed anchor observations and testing, fireproofing inspections and testing, intumescent paint observations and testing, bituminous testing, roofing observations, rock anchor observations and testing, and ongoing geotechnical consulting services.

节能效果

Completed in 2017, the Main Energy Plant is expected todouble the energy efficiency output of the old plant, saving the University of Minnesota an estimated $2 million in operating costs each year. The combined heat and power plant will also reduce carbon emissions by an estimated 10 to 13 percent, helping the university achieve its sustainability goals.

This project has received several notable awards for its extraordinary achievements including the 2017 Minnesota Brownfields ReScape Award for Environmental Impact; the 2018 Minnesota Construction Associations’ Award of Excellence for Green/Sustainable projects; the 2018 ACEC/Texas Engineering Excellence Gold Award for Energy project and a 2018 National Recognition Award at the National ACEC Engineering Excellence Awards competition.