ALLAN P HENDERSON
Engineers in Bakersfield, CA

7618217, Nov 17, 2009

May 7, 2007

11/797772

Allan P. Henderson - Bakersfield CA, US

E02D 27/00

405255, 52294, 52295, 52296, 405239, 405251, 405256

A post-tensioned pile anchor foundation and method therefor creates a void or highly compressible region between a drilled or driven pile anchor surrounding a post-tensioned anchor bolt or tendon and the bottom of a foundation cap. The void or compressible region can be formed by compressible spacers or void forming elements placed between the top of the pile anchor and the concrete cap. As the anchor bolt or tendon is post-tensioned against the cap, the void forming element is compressed or crushed, allowing the cap to be pulled downwardly and the pile anchor to be pulled upwardly toward the cap against the resistance of the surrounding soil.

7533505, May 19, 2009

Dec 15, 2003

10/734281

Allan P. Henderson - Bakersfield CA, US

E02D 27/00

52292, 52294, 52295, 52296, 52155, 52156, 405228, 405244, 405232, 4052521, 405229, 405239

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.

7707797, May 4, 2010

Mar 25, 2008

12/076904

Allan P. Henderson - Bakersfield CA, US

E02D 27/12, E02D 27/42, E02D 27/32

5274517, 52111, 52153, 52155, 52158, 52166, 521699, 52292, 52295, 5274504, 5274117, 5274113, 5274114, 522234, 522235, 405232, 405233, 405244, 4052521

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.

6782667, Aug 31, 2004

Dec 5, 2000

09/729250

Allan P. Henderson - Bakersfield CA

Z-Tek, LLC - Santa Monica CA

B66C 2300

52116, 52118, 521231, 5274517, 212347

A support tower for large structures such as wind turbines generators, microwave structures, high voltage transmission lines or the like, constructed of telescopic sections with the lowermost section having an edge portion pivotally connected to a foundation to enable the tower sections to be transported to the site of installation. The tower sections are assembled at the installation site in a nested relationship, each within the adjacent lower tower section. The large load is mounted on the upper end of the uppermost tower section and the nested tower sections are then tilted upwardly to a vertical position. After the tower is tilted to its vertical position and securely connected to the foundation, the telescopic tower sections are vertically extended to position the load in a vertically elevated position.

6672023, Jan 6, 2004

Feb 8, 2002

10/067999

Allan P. Henderson - Bakersfield CA 93308

E02D 2700

52296, 52292, 52297, 522234, 405244, 405256

A perimeter weighted foundation has a central pier pedestal and a base extending outwardly from and below the pier pedestal. The base includes an outer perimeter wall section and a radially extending, disk-shaped spread section interconnecting the bottom of the pier pedestal and the top of the perimeter wall section with the top surface of the spread section being positioned substantially below the top of the pier pedestal. The pier pedestal includes vertical post tensioned anchor bolts in accordance with U. S. Pat. Nos. 5,586,417 and 5,826,387. The spread section includes two layers of sleeved post tensioned bolts which extend through the bottom of the pier pedestal, through the spread section and into the top of the perimeter wall section to post tension the perimeter wall section, the spread section and the pier pedestal. Soil back filled onto the top of the spread section and pier pedestal and into the interior of the pedestal enables the foundation to withstand high upset forces imparted to the foundation.

2013025, Oct 3, 2013

Mar 30, 2012

13/435527

Allan P. HENDERSON - Bakersfield CA, US

E02D 27/42, E02D 27/32, E02D 5/80, E04C 5/12, E02D 27/00

5222313, 52296, 5274115, 5274521, 52295

A post-tensioned concrete cap foundation has helical anchors with pipes having several helical discs welded around the pipe perimeter to spin drill deep into subsurface soils or other soft materials with holes in the pipe for high pressure-grouting in place. The helical anchor pipes are coupled to a tensioning element for pulling and post-tensioning the helical anchor. The helical anchors are tension anchors which can be converted to compression anchors. The helical anchors in tension serve to pull the foundation cap down to compress the underlying soil while the compression anchors limit the maximum settlement of the concrete foundation cap. The foundation also includes perimeter-forming and interior corrugated metal pipes with upper and lower sleeved horizontally extending radial bolts that are secured to the pipes and post-tensioned to provide lateral foundation compression.

7155875, Jan 2, 2007

Nov 21, 2003

10/717629

Allan P. Henderson - Bakersfield CA, US

E04B 1/00, E04G 21/00, E04G 23/00

5274115, 5274214, 52294, 52296, 522234

A perimeter weighted foundation has a central pier pedestal and an enlarged base spaced outwardly and extending below the pedestal. The enlarged base includes an outer concentric perimeter wall section with a radially extending, disk-shaped spread section interconnecting the bottom of the pedestal section and the top of the perimeter wall section. The pedestal section includes vertically extending post-tensioning anchor bolts sleeved through substantially the entire height of the cylindrical pedestal in accordance with earlier U. S. Pat. Nos. 5,586,417 and 5,826,387 and the spread section includes two layers of similarly sleeved post-tensioning bolts which extend through the bottom of the pedestal section and into or through the top of the perimeter wall section, thus tying together the enlarged base to the pier pedestal. After the concrete is poured, hardened and cured, the vertical bolts of the pedestal section and the radially extending horizontal bolts in the spread section are post-tensioned to impart a heavy unit compressive loading on the concrete in the pier pedestal and enlarged base. After back filling soil onto the spread section and to the interior of the pedestal section, the foundation is able to withstand high upset forces imparted to the foundation by any large structure supported thereon.

5586417, Dec 24, 1996

Nov 23, 1994

8/346935

Allan P. Henderson - Bakersfield CA
Miller B. Patrick - Bakersfield CA

E02D 538, E02D 2732

52295

A hollow, cylindrical pier foundation is constructed of cementitious material poured in situ between inner and outer cylindrical corrugated metal pipe shells. The foundation is formed within a ground pit and externally and internally back filled. The lower end of the foundation has a circumferential ring fully embedded therein and sets of inner and outer circumferentially spaced bolts have their lower ends anchored to the anchor ring, their upper ends projecting up outwardly of the top of the foundation and a majority of the midportions thereof free of connection with the cementitious material of which the foundation is constructed. The base flange of a tubular tower is positioned downwardly upon the upper end of the foundation with the upper ends of the inner and outer sets of bolts projecting upwardly through holes provided therefor in the base flange and nuts are threaded downwardly upon the upper ends of the bolts and against the base flange. The nuts are highly torqued in order to place the bolts in heavy tension and to thus place substantially the entire length of the cylindrical foundation in heavy axial compression.

5826387, Oct 27, 1998

Dec 24, 1996

8/773053

Allan P. Henderson - Bakersfield CA
Miller B. Patrick - Bakersfield CA

E02D 538, E02D 2732

52295

An upright cylindrical pier foundation is constructed of cementitious material. The lower end of the foundation has a plate or circumferential ring fully embedded therein and long circumferentially spaced rods or bolts have their lower ends anchored relative to the ring. The upper ends of the long rods project up outwardly of the top of the foundation. The rods are shielded over substantially their entire length against bonding with the cementitious material to allow the rods, when heavily tensioned, to stretch within the cementitious material. A heavy flange, which may comprise the base flange of a tubular tower, is positioned downwardly upon the upper end of the foundation with the upper ends of the bolts projecting through holes provided therefor in the base flange. Nuts are threaded downwardly upon the upper ends of the bolts and against the base flange under high torque in order to place the bolts in heavy tension and substantially the entire length of the cylindrical foundation under high unit compressive loading. The pier foundation may include a diametrically enlarged upper end shoulder portion whose outer peripheral portion includes additional circumferentiallv spaced heavily tensioned short rods anchored between a second anchor plate or ring embedded in the shoulder portion and a second flange or ring seated downwardly on the shoulder portion upper end.

2009021, Aug 27, 2009

Feb 10, 2009

12/320999

Allan P. Henderson - Bakersfield CA, US
Zyi Gershony - Lancaster CA, US
Vaughn Johnson - Tehachapl CA, US
Robert E. Godfrey - Los Angeles CA, US

E04H 12/00

52 40

A support tower for heavy loads or large structures such as a wind turbine generators, constructed of a plurality of telescopic tower sections with the outer lower tower section having a lower end supported from a foundation and at least one or more inner upper tower sections telescoped in an initial vertical nested relation within the outer lower tower section. The heavy load is mounted on an upper end of the inner upper tower section while in the initial vertical nested relation. The inner upper tower section or sections are then lifted upwardly to an extended tower height by lift mechanisms and the tower sections are secured in vertically extended position by inter-engaging wedge joint structure with bolt fasteners extending through mating wedge surfaces to retain the telescopic tower sections vertically extended and position the heavy load in a vertically elevated position.