Microtunneling and Horizontal Drilling by French Society for Trenchless Technology (FSTT)

By French Society for Trenchless Technology (FSTT)

This ebook contains ideas ready via participants of the French Society for Trenchless expertise (FSTT), in accordance with their fresh nationwide multi-year undertaking. finished directions, innovations and theories within the parts of either microtunneling and horizontal drilling are given, encompassing the fields of software for every technique, what investigations can be undertaken, which machines and kit may be used, how the paintings might be controlled and strength difficulties which may arise.
The techniques, the analytical tools used and their verification with laboratory and box info are not simply enhance the speed of good fortune of trenchless initiatives, yet can also be of significant price to engineers in different nations, who can evaluate the consequences with their very own findings and verify the foreign state-of-the-art.

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These Figures, however, need to be adjusted according to the driving methods accepted. 4 will present the methods enabling the evaluation of these effects in greater detail. 6. 1. Summary of parameters affecting the microtunneling The French National Research Project “Microtunnels” included in particular the continuous monitoring of fourteen microtunneling sections, of lengths varying from 40 to 170 meters and sunk at a depth of 1 to 30 meters. The nature of soils covered is of various types: ranging from clean fine sand to extremely soft clay including sandgravel mixtures.

2). 2. Diagram of the steering cylinders of the boring machine head [FSTT RS22] Summary of Parameters Affecting Work at the Site 47 When the machine veers off-course, the operator manipulates these cylinders in order to correct the angle of the head α and re-establish the trajectory. The operator has means to lengthen the steering cylinders and can thus apply the corrections in a controlled way. However, there is a time lapse between the correction on the cylinders and the actual re-establishment of the trajectory, during which the boring machine continues to advance with a deviation in relation to its theoretical trajectory.

1. Reduction in dynamic friction On all the monitored sites, it was seen that the lubricant helped considerably reduce dynamic frictional forces. As for technical reasons the lubricant is injected only after 20 to 30 meters of jacking, we were able to easily quantify the impact of the latter on frictional forces. e. a reduction of 77% with respect to the friction without lubrication. 12. Variation in the jacking thrust at Châtenay-Malabry Summary of Parameters Affecting Work at the Site Montmorency 3 Nature of the soil Length of section (m) Champigny 4 Marl and Silty marl, a little gravely-sand sand in places marl Geneva Châtenay -Malabry Montmorency 2 Bouliac 3 Sandstone marl and altered sandstone Fine clean sand Fine sand not very clayey Clean sand 120 80 170 166 170 90 1,080 760 1,275 960 1,080 650 Overcut (mm) 30 10 20 15 30 10 Nature of lubricant Bentonite Bentonite Bentonite Bentonite Bentonite 4 m from the face 4 m from the face 4 m from the face External diameter of pipes (mm) 4 m from the face 4 m from the face 59 Bentonite + polymer 4 m, 20 or 44 m from the face Injection points Volume of lubricant injected per meter sunk V.

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