Pile anchor foundation
DCFirst Claim
1. A pile anchor foundation for supporting a heavy load from a ground surface comprising a concrete foundation cap having a bottom surface engaged with said ground surface and an upper surface supporting a heavy load connected rigidly thereto and a plurality of elongated pile anchors depending from said cap, each of said pile anchors including cementitious material extending into underlying soil a substantial vertical depth below said foundation cap, a void or a gap at an upper end of each pile anchor between said cementitious material of each said pile anchor and a bottom surface of said cap, each of said pile anchors further including a tension member anchored thereto and extending upwardly through said respective void or gap and said cap, a lower end of each tension member being anchored in said pile anchor, an upper end of each tension member including a post tensioning assembly which engages an upper surface of said cap to pull said cap downwardly, an upper portion of each tension member being movable in relation to said pile anchor and said cap to enable stretching of said tension member when the post tensioning assembly on the upper end thereof is tightened downwardly against the cap so that said upper end of the pile anchor moves upwardly into said void or gap and said cap is pulled downwardly and compresses underlying soil forming said ground surface, said cap bearing on the underlying compressed soil to withstand overturning and uplifting forces exerted on said cap by said heavy load connected to said cap.
1 Assignment
Litigations
1 Petition
Accused Products
Abstract
A circular concrete cap foundation poured in-situ within a perimeter forming corrugated metal pipe set atop or within an excavated pit and enclosing a series of circumferentially spaced pile anchors. The circular concrete cap foundation supports sets of inner and outer circumferentially spaced tower anchor bolts having their lower ends anchored to an embedded anchor ring and their upper ends projecting vertically and upwardly out the top of the circular foundation to engage the base flange of a supported tower. The pile anchors are formed with perimeter corrugated metal pipes set deep in subsurface soils with cementitious material surrounding and partially bonding to a centralized steel bolt or tendon which extends through the cap foundation. The tower anchor bolts and the pile anchor bolts are both partially encased in a PVC sleeve so that the bolts can be post-tensioned. The pile anchors are in tension only and serve to pull the cap foundation down to compress the underlying ground soils.
99 Citations
25 Claims
- 1. A pile anchor foundation for supporting a heavy load from a ground surface comprising a concrete foundation cap having a bottom surface engaged with said ground surface and an upper surface supporting a heavy load connected rigidly thereto and a plurality of elongated pile anchors depending from said cap, each of said pile anchors including cementitious material extending into underlying soil a substantial vertical depth below said foundation cap, a void or a gap at an upper end of each pile anchor between said cementitious material of each said pile anchor and a bottom surface of said cap, each of said pile anchors further including a tension member anchored thereto and extending upwardly through said respective void or gap and said cap, a lower end of each tension member being anchored in said pile anchor, an upper end of each tension member including a post tensioning assembly which engages an upper surface of said cap to pull said cap downwardly, an upper portion of each tension member being movable in relation to said pile anchor and said cap to enable stretching of said tension member when the post tensioning assembly on the upper end thereof is tightened downwardly against the cap so that said upper end of the pile anchor moves upwardly into said void or gap and said cap is pulled downwardly and compresses underlying soil forming said ground surface, said cap bearing on the underlying compressed soil to withstand overturning and uplifting forces exerted on said cap by said heavy load connected to said cap.
- 11. A foundation for supporting a tower subject to high overturn loads which comprises a concrete cap defined by vertically spaced top and bottom surfaces and a peripheral wall, said cap adapted to be supported on an upwardly facing soil surface, fastening members rigidly securing said tower to said cap upper surface, a plurality of pile anchors depending from said bottom surface of said cap in spaced relation, said pile anchors positioned in and surrounded by soil underlying said cap with each pile anchor including cementitious material and having an elongated tension bolt anchored therein and extending through said cap, and a post tensioning assembly cooperating with an upper end of each tension bolt and in contact with said top surface of said cap to pull said cap downwardly to compress soil underlying said cap to resist overturning and uplifting forces exerted on said cap by the supported tower, each of said pile anchors including an elongated corrugated pipe substantially filled with cementitious material with said tension bolt being generally centralized therein, each said tension bolt having a lower end anchored in said cementitious material and being sleeved over a major portion of its length to prevent bonding with the cementitious material of the pile anchor and said concrete cap to permit post tensioning of said tension bolts, an uppermost end of each of said pile anchor corrugated pipes forming a void or gap between an upper surface of said cementitious material in said pipe and a lower surface of said cap, said tension bolt extending from said cementitious material of said pile anchor through said void or gap and through said cap, said void or gap enabling the concrete cap to be pulled downwardly to compress and consolidate underlying soil to desired strengths and permitting the pile anchors to move upwardly to develop skin friction resistance against the surrounding soil substantially equal to the pile anchor bolt post tension.
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17. A pile anchor foundation for supporting a heavy load from a ground surface comprising:
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a concrete foundation cap having a bottom surface engaged with said ground surface and an upper surface supporting a heavy load connected rigidly thereto; and a plurality of elongated pile anchors formed in pile holes that extend from said ground surface into underlying soil beneath said foundation cap a substantial vertical depth, each of said pile anchors including a column of cementitious material having an upper surface and extending to a bottom portion of a respective pile hole, said upper surface of said pile anchor cementitious material and an adjacent area of said foundation cap bottom surface being configured to leave a gap or void between said upper surface of said pile anchor cementitious material and said adjacent area of said foundation cap bottom surface, each of said pile anchors including a tension member having a lower portion anchored in said cementitious material and extending upwardly through said respective gap or void and through said cap, an upper end of each tension member including a post tensioning assembly which engages an upper surface of said cap to pull said cap downwardly, an upper portion of each tension member being movable in relation to said pile anchor and said cap to enable stretching of said tension member when the post tensioning assembly on the upper end of said tension member is tightened downwardly against the cap so that said upper surface of said pile anchor cementitious material moves upwardly into said gap or void, thus reducing a vertical extent of said gap or void between the upper surface of said pile anchor cementitious material and the bottom surface of the cap, and thereby transfers stress to the soil surrounding said pile anchor, said cap being pulled downwardly so as to compress soil underlying said ground surface. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification