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相关概念视频

Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

771
Concrete pavement joints are essential for maintaining the structural integrity and longevity of pavement by controlling where and how the pavement cracks. These joints can be categorized based on their functions, such as contraction or control joints, construction joints, isolation joints, and expansion joints.
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...
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Placing Concrete01:17

Placing Concrete

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The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
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Survey Safety01:28

Survey Safety

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Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

407
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Design Example: Sustainability in Concrete Building01:26

Design Example: Sustainability in Concrete Building

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As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
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相关实验视频

Updated: Apr 25, 2026

Evaluating the Effect of Roadside Parking on a Dual-Direction Urban Street
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道路建设的全球战略

William F Laurance1, Gopalasamy Reuben Clements2, Sean Sloan1

  • 1Centre for Tropical Environmental and Sustainability Science, and College of Marine and Environmental Sciences, James Cook University, Cairns, Queensland 4878, Australia.

Nature
|August 28, 2014
PubMed
概括

到2050年,道路扩建将增加60%,影响生物多样性. 这项研究提出了一个全球分区计划,以平衡道路发展与保护和农业需求.

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Design and Construction of an Urban Runoff Research Facility
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科学领域:

  • 环境科学环境科学
  • 保护生物学 保护生物学
  • 城市规划是城市规划.

背景情况:

  • 预计到2050年,全球道路网络将扩展60%,其中大部分建设在发展中国家.
  • 道路扩建导致息地丧失,碎片化和环境退化,特别是在生物多样性地区.
  • 当前的道路规划往往是反应性的,并且很难跟上快速扩张的步伐.

研究的目的:

  • 提出一个全球计划,优先考虑道路建设.
  • 尽量减少环境成本,同时最大限度地提高人类发展的利益,特别是农业生产.
  • 确定道路避难,战略发展和冲突解决的领域.

主要方法:

  • 对环境价值和农业潜力的全球分析.
  • 为道路基础设施制定一个大规模的区域划分计划.
  • 确定道路建设和保护的优先领域.

主要成果:

  • 鉴定因环境价值高而应避免修建道路的地区.
  • 指定区域进行战略道路改造,以促进农业的发展,并尽量减少对环境的影响.
  • 确定具有高农业效益但存在重大环境风险的"冲突地区".

结论:

  • 积极的分区计划对于在发展的关键时期管理道路扩建至关重要.
  • 优先考虑道路建设可以减轻负面环境影响,并支持全球粮食安全.
  • 拟议方案为可持续基础设施发展和生物多样性保护提供了一个模板.