Excavation Techniques for underground Drinking water pipe line with micro piles special application-PPT Presentation

PPT Presentation

Pdf Summary

The document presents the engineering and construction of micropile walls and a vertical interconnection shaft for an underground drinking-water pipeline and tunnel linking Hegdewar Udyan, Pratiksha Nagar, and Parel in Mumbai.<br /><br />It describes two main micropile types—reinforced bar piles and cased piles—and their use under axial or lateral loading, particularly where space is limited or ground includes both soil and rock. Compared with sheet piles, micropiles can be more suitable for retaining mixed soil-and-rock strata. The presentation also outlines applicable Indian, British, European, and American standards for piling, anchors, steel, and grout.<br /><br />A project example covers a micropile retaining wall in weathered basalt, selected instead of sheet piling because of operational constraints. The excavation reached 5.5 m and used permanent casing, a single level of struts, and staged analysis with WALLAP software.<br /><br />The construction sequence includes setting out, drilling with temporary casing, installing permanent casing, grouting, preparing pile heads, building a capping beam, installing walers and soil nails or rock bolts, and excavating. Grout quality is controlled through water–cement ratios of 0.36–0.40, flow-cone testing, and compressive-strength tests at 7 and 28 days.<br /><br />The document also emphasizes quality control, appropriate drilling and grouting equipment, and safety measures addressing silica dust, cave-ins, equipment hazards, personal protective equipment, and utility-location checks before drilling.

Keywords

micropile walls

vertical interconnection shaft

underground pipeline

tunnel construction

reinforced bar piles

cased piles

weathered basalt

retaining wall

grouting quality control

construction safety