DRILLED AND POURED PILES SUPPLY UNAIDED SUPPORT

Surrounding earth remains undisturbed, no temporary shoring is needed, and in-place building members remain unstripped as a pile drilling and pouring system underpins existing structures while tunneling and other major digging proceed nearby. The system's rotary steel casings sank deep holes for concrete piles to support a building adjacent to subway construction in Washington, D.C. Five-inch-ID steel casings were drilled 61-1/2 ft. down from ground level. At about 46 to 49 ft. deep, casing cutter heads with tungsten carbide teeth bored through the buildings 3 to 4 ft. thick concrete spread footings. The holing-through permitted the piles to be poured through the foundation. A direct connection was thus created, and the completed concrete piles became an integral part of the structure working as close as 3 in. to the building line, with timber-lagged soldier piles to its rear, the casings were rotated into place with its own 35-hp electric rig. When drilling ended, a 2-in. pipe tremied concrete to the bottom of the casing; reinforcing steel was thrust in and a screwed-on sealing head capped the casing. The jarring action rammed the concrete against the earth - creating an effective bond and eliminating voids.

• Corporate Authors:

  McGraw-Hill, Incorporated

  330 West 42nd Street
  New York, NY  United States  10036
• Publication Date: 1975-8

Media Info

• Features: Figures; Photos;
• Pagination: p. 63
• Serial:
  • Construction Methods and Equipment
  • Volume: 57
  • Issue Number: 8
  • Publisher: McGraw-Hill, Incorporated

Subject/Index Terms

• TRT Terms: Concrete; Construction; Cutting tools; Drilling; Foundations; Lagging (Earthwork); Material reinforcement; Pouring; Rotary drilling; Shoring; Structural supports; Subways; Support piles; Timber; Tungsten; Tunneling
• Uncontrolled Terms: Underpinning
• Old TRIS Terms: Casing tools; Concrete piles; Cutters; Foundations (Structures); Lagging; Subway construction; Supports
• Subject Areas: Bridges and other structures; Construction; Highways;

Filing Info

• Accession Number: 00127485
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 10 1976 12:00AM