OVERVIEW:
An 8-story mixed use building designed by Gene Kaufman is currently going up at 211 McGuinness Blvd. in the Greenpoint neighborhood of Brooklyn. The anticipated install rate of the originally specified micropile was 2 piles per day. There were a total of 340 micropiles on this project.
CHALLENGE:
The greatest challenge with this project was the high water table and the significant costs that would be associated with excessive dewatering. The tops of the piles were 4’ to 6’ below the water table. Before the STELCOR DDM (Drilled-In Displacement Micropile) was introduced as an alternate, there were two options for pile installation; excessive dewatering or install the pile, excavate, and cut-off.
SOLUTION:
Using the proprietary below-grade drive tool from Ideal, the need for dewatering was eliminated. The 340 Stelcor DDM micropiles were installed to 120,000 ft. lbs. using a Digga MD160 drive motor. The piles were installed at a rate of 10 per day as opposed to the anticipated 2 piles per day with the originally specified micropile. The elimination of dewatering costs and the accelerated install times resulted in significant benefits to all parties involved.
View the full case study that includes soil borings, load tests, etc. HERE.
See how STELCOR Drilled-In Displacement Micropiles can save your project.
OWNER:
Stellar Management
New York, NY
ARCHITECT:
Gene Kaufman Architect PC
New York, NY
GENERAL CONTRACTOR:
Britt Realty Construction
Brooklyn, NY
STRUCTURAL ENGINEER:
Gene Kaufman Architect PC
New York, NY
GEOTECHNICAL ENGINEER:
AECOM
New York, NY
and
Geotechnical Engineering Services, P.C.
Elmsford, New York
INSTALLER:
Champ Construction Corp.
Hempstead, NY
LOADS:
150 tons allowable compression
75 tons allowable tension
1 ton allowable lateral
ANTICIPATED TEST LOAD: 300 tons
ACTUAL TEST LOAD: 300 tons
SPECIFICATIONS:
7” pile shaft
.498” W.T. 80 ksi
16” corrugated grout column
18” tip or drive plate
39.8 ft. bond length
25 psi acheived bond