David Gene Robertson
Land Surveyors in Perrin, TX

License number
Utah 184552-2203
Issued Date
May 20, 2008
Expiration Date
Mar 31, 2011
Category
Engineer/Land Surveyor
Type
Professional Structural Engineer
Address
Address
Perrin, TX
LicenseFiles verified this license of Dec 7, 2016 at the Utah Division of Occupational and Professional Licensing.

Professional information

David Robertson Photo 1

Retaining Wall And Method Of Making Same

US Patent:
2005028, Dec 29, 2005
Filed:
Jun 23, 2004
Appl. No.:
10/876171
Inventors:
David Robertson - Perrin TX, US
John Ogorchock - Spring TX, US
International Classification:
E02D017/00
US Classification:
405284000
Abstract:
A retaining wall is provided that may include a first/bottom mat, a second/top mat and a third/cap mat. Each of the mats may include a plurality of elongated members connected to form a grid and may have a generally flat section. Each of the first and second mats may also include an upstanding section extending upwardly from a forward edge of the generally flat section. The upstanding sections may be inclined backwardly toward the generally flat sections. The upstanding section of the first mat may also include a plurality of extension members extending upwardly from an upper end of the upstanding section at an angle in relation to the upstanding section of the first mat, and be adapted for engagement with the second mat. The third mat may include a face section extending downwardly from a forward edge of the generally flat section of the third mat, which face section may be adapted for engagement with the upstanding section of the second mat, such as by means of a hook. One or more support members may be attached to the first and second mats to prevent the upstanding sections of the mats from bowing or inclining outwardly. Related methods are also provided.

David Robertson Photo 2

Precast Arch Structure With Skewed Ends

US Patent:
7572084, Aug 11, 2009
Filed:
Apr 27, 2006
Appl. No.:
11/412769
Inventors:
David G. Robertson - Perrin TX, US
John M. Ogorchock - Spring TX, US
Assignee:
Tricon Precast, Ltd. - Houston TX
International Classification:
E04B 1/32
US Classification:
405126, 14 24, 52 86
Abstract:
A skewed end assembly for connection to an arch culvert structure is provided. The assembly may generally include an arch-shaped inner skewed panel and a wedge member having a partially arch-shaped profile adapted for engagement with the inner skewed panel. The inner skewed panel may include a ledge that may include a plurality of threaded anchors. The wedge member may include a lip adapted for engagement with the ledge. The lip may include a plurality of apertures for receiving a plurality of threaded connectors adapted for threadable engagement with the corresponding threaded anchors in the ledge. Two assemblies, each comprising an inner skewed panel and a wedge member, are placed at opposed ends of an arch-shaped bridge or culvert structure to provide generally co-planar skewed ends to the structure such that it may be positioned at an angle in relation to a roadway such that the skewed ends are generally parallel to the roadway.