Results 171 to 180 of about 1,297 (234)

Response law and limit of triple bore pressure relief in coal seams under mining induced load. [PDF]

Sci Rep
Lixin Z, Zehui D, Gang L, Guangchao L, Xu L.   +4 more
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Study on the grouting repair performance of shield tunnel segments based on high-fluidity slurry. [PDF]

Sci Rep
Huang K, Zhou K, Huang B, Wu X, Li Z, Xing K.   +5 more
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Collision detection method for anchor digging machine water drilling rig. [PDF]

Sci Rep
Liu ZX, Yan ST, Zou K, Xie M.
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Productivity analysis of horizontal directional drilling

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Productivity Analysis of Horizontal Directional Drilling

Pipelines 2009, 2009
The National Research Council of Canada reported that rehabilitation of municipal water systems between 1997 and 2012 would cost $28 billion (NRC, 2004). With the rapid increase of new installations, the need for replacement and repair of pipe utilities and also the demand for trenchless excavation methods, increase.
Muhammad Adel, Tarek Zayed
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Autonomous Trenchless Horizontal Directional Drilling

2020
Over the past 25 years trenchless technology has flourished in many pipeline installation applications as water industry, sanitary sewer, and natural gas pipeline industry. Trenchless technology gained more popularity than open trench due to its economic and environmental factors, it facilitates the installation, replacement, or rehabilitation of ...
Mahmoud A. K. Gomaa, Moustafa Elshafei, Abdul-Wahid A. Saif, Abdulaziz A. Al-Majed   +3 more
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Drilling Fluid Pressure Calculation in Horizontal Directional Drilling

ICPTT 2012, 2012
Drilling fluid plays an important role in horizontal directional drilling (HDD). It cuts soil, suspends and transports cutting out of the borehole, it forms filter cake to prevent slurry lose and maintain the borehole stability. During HDD process, reasonable drilling pressure should be controlled.
Jiang Lu, Hongzhou Zhang, Qiang Ma
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Automatic Trenchless Horizontal Directional Drilling Using Quad Motors Drilling Heads

2018 15th International Multi-Conference on Systems, Signals & Devices (SSD), 2018
Trenchless technology facilitates the installation, replacement, or rehabilitation of underground utility systems with minimum disruption of the surface. Horizontal Directional Drilling (HDD) is used for pipelines installation beneath buildings, forests, or lacks without excavation or at least minimum digging. HDD requires less surface area disturbance
Mahmoud A. Kamel, Moustafa Eishafei, Abdul-Wahid A. Saif, Abdulaziz A. Al-Majed   +3 more
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Mechanical Analysis of Drill Strings in Horizontal Directional Drilling

ICPTT 2011, 2011
A large number of failure cases on horizontal directional drilling arise from complex forces, difficult mechanical analysis and lack of theoretical basis of construction parameters. So it's of great engineering value to make mechanical properties of horizontal directional drilling clear.
Yihua Dou, Yinping Cao
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Postconstruction Evaluation of Horizontal Directional Drilling Installations

Practice Periodical on Structural Design and Construction, 2005
Recently, questions have arisen concerning the compactive nature of drilling fluids within the annular space during horizontal directional drilling (HDD) operations. To address these concerns, a field and laboratory study was conducted to provide both a qualitative and a quantitative assessment of the annular space. The study consisted of installing 61
Samuel T. Ariaratnam, Ivan J. Beljan
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