Microtunneling：要知道的主要规划要素

The planning phase for amicrotunneling.项目通常包括数据收集，土壤和岩石样本的核心测试，以及岩土工程调查.

The most important factor to consider is the line and grade of the trenchless project.

在这里，我们将看看项目的组件，这些组件对于确定Microtunneling项目的线路和等级至关重要。（还阅读：挖沟微管工程的基础知识。）

Essential Elements of Planning

1. Gather information about past projects in that area.
2. 识别现有的地下公用事业和人孔。
3. 建立轴之间的视线。
4. Data collection.
5. 实验室测试.
6. Geotechnical investigation.

Subsurface Conditions

关于过去的过去项目的知识在规划过程中提供了一个头部。这消除了猜测和假设，并提供了分析和规划的理想情况。

For example, railroad embankments have been known to contain old rail pieces, fish plates and ties that can damage amicrotunnel boring machine（MTBM）。

如果面积的影响下contaminating material, consideration must be given to the proper disposal of the muck.

沿着隧道路线，可能会有人孔或现有的公用事业可能导致项目执行点的干扰。

在规划的同时，注意到这些潜在问题并将它们包括在数据中，将有助于准备更准确的隧道路线的图片，最小偏差。

免费下载：岩土工地调查s: Your Ultimate Guide to Identifying Project Risks

Having information about subsurface conditions is very important. Hiring ageotechnical engineerwith the proper knowledge, and reliable equipment to carry out such an investigation, may seem like an expensive affair, but it may actually prove to be a time and cost saving decision. (Learn more about this in "Why a Detailed Geotechnical Report Means Success for Your Trenchless Project"）。

Strong partnering between the owner, the designers and the contractor is necessary to eliminate risks and save costs. It is necessary for the owner to provide adequate information about subsurface conditions to the contractor.

可以通过沿着所提出的路线的物理观察可以容易地识别出可识别的障碍物，如胶合板和薄板壁。各个轴的长度和位置应根据项目的范围确定。

长的驱动器可以证明是耗时和昂贵，因为它们需要使用多个interjacking站。应在所提出的微管孔的不同交叉点处进行调查工作。

样本收集和实验室测试

Collecting data from测试坑和毛孔holes is a crucial element of planning for a microtunneling project. Ideally, initial borings should be taken at wider intervals, about 300 feet apart, and also at thelaunch和reception points.

在地下条件的显着变化的情况下，可能需要额外的硼。

Sometimes bucket borings, or large test pits, and auger drilling may be required if there is a reason to suspect the presence of rocks, stones and boulders nestled together that could hinder the progress of an MTBM.

Soil samples are tested in a lab as a standard procedure to help determine the type of accessories to be used with the MTBM for a specific project including screening and separation equipment.

例如，该数据可用于确定是否a离心机system is required. If the site offers rocky conditions, core rock samples should then be tested to determine inherent properties.

Geotechnical Investigation

岩土工程调查是项目规模和预算的强制性招股章程，包括：

岩土学数据报告

The岩土学数据报告(GDR) addresses sampling, laboratory analysis, and the interpretation of site specific engineering properties.

岩土基线报告

岩土基线报告（GBR）提供了在微管化过程中预期的当前岩土工程的有意义的结合，有意义的描述。

这些报告以及招标文件构成了岩土工程调查，并提供了清晰的项目范围和潜在支出的图片，有助于减少索赔，并为共享风险创造基础。

工作空间，方法和设备

虽然上述规划因素对于确定地下条件是必不可少的，但是防止惊喜的，而且还需要选择正确的微管系统来执行工作。（了解更多信息“隧道隧道”An Overview of Trenchless Tunneling“）。

在设置MTBM之前，必须查看以下内容：

• 确保安全的工作空间可用，包括用于MTBM的启动和检索轴的所需表面空间。
• 确定MTBM系统是否能够实现招标中指定的驱动长度和深度。
• 基于隧道面部条件确定切割器头配置。
• 理解将挖掘材料移除到浆料室中的方法，并且需要基于尺寸分离颗粒。

最后的想法

A failed MTBM project can incur high costs in terms of machinery, material, labor and reputation. Planning should be the first concern in any project, especially when dealing with subsurface construction that relies heavily on unseen subsurface data, past construction outcomes and current utility mapping.

Gathering this data should be foremost in planning to prevent accidents, such as drilling through gas pipelines, existing sewer lines and cables.

根据进行的研究和土壤和地理条件的调查数据，沉降要么水力压裂can be prevented by choosing appropriate accessories for the MTBM.