Underwater Hollow Bar Micropile Installation-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes the underwater installation of hollow-bar micropiles for the Museum of the Second World War in Gdańsk, Poland. The museum is almost entirely underground, with three basement levels on a four-acre site. During construction, the site had an average water depth of 59 feet; water was pumped out after the micropiles were installed.<br /><br />The project required anchoring the basement slab against uplift and securing the water stop while managing pressure from a 52.5-foot water column. Access was available only from the water, creating technical, logistical, and scheduling challenges.<br /><br />The design used 914 TITAN 103/51 D micropiles, arranged on a 13-by-13-foot grid. Each had a 72-foot working length and a 52.5-foot free length, for a total length of 124.5 feet. The specified tension loads were 517 kips during the temporary phase and 380 kips permanently, with a 100-year design lifespan.<br /><br />Load testing included piles with 72-foot and 125-foot lengths. The maximum test load reached 737 kips.

Keywords

underwater installation

hollow-bar micropiles

Museum of the Second World War

Gdańsk Poland

basement uplift anchoring

waterstop pressure

TITAN 103/51 D

tension load testing

underground construction

micropile design