Vsl International Ltd

L. B. Foster Company

John Richard Crigler

Donald Paul Kline

Daniel Wallace Falconer

Robert Duncan Lapsley

A vent flow apparatus and method for general application in venting and filling air pockets in conduit or duct type apparatuses designed for passage of material therethrough is provided including a hollow vent flow conduit preferably in the form of a tube having an entry opening and a downstream exit opening with both openings being in communication with a duct for flow of material therethrough. The entry opening is in communication with the duct at a first location of greater cross-sectional area of the duct than a second location of communication of the exit opening with the duct. The vent flow conduit has particular applicability for post-tensioning systems for concrete or other suitable structures, particularly post-tensioning systems which include body sections interconnected in series by an intermediate anchor head and which use a transfer means for routing grout between the body sections and around the intermediate anchor head.

Vent flow apparatus and method

A retained earth structure includes an upright soil retaining wall of interlocking facing panels and a plurality of horizontal elongated wire mesh reinforcement panels extending outwardly from the back surface of the modules into the backfill material. The wire mesh panels are connected in tiers to the retaining wall while embedded in the backfill material soil behind the wall by use of a three-way adjustable, turnbuckle-type connector assembly. The three-way adjustable turnbuckle-type connector assembly ensures verticality of the finished precast wall panels.

Mechnically stabilized retaining wall system having adjustable

A post-tensioning apparatus and method including first and second body sections interconnected by an intermediate anchor head. Each body section has an end anchor head on an end opposite the intermediate anchor head and includes a tendon with a pair of strands adapted for being tensioned between the intermediate anchor head and the corresponding end anchor head of each body section. Each pair of strands is encapsulated between the intermediate anchor head and each corresponding end anchor head of each body section in a mechanically interlocked duct adapted to receive a bonding agent after tensioning of the strands. A passage is provided proximate the end anchor head of the first body section and provides a passage for insertion of bonding agent, preferably in the form of grout, into the duct of the first body section. Grout can be injected through the passage proximate the end anchor head of the first body section such that the grout can enter and fill the duct of the first body section. A tube provides a passage for grout to pass from the duct of the first body section to the duct of the second body section and around the intermediate anchor head. The ducts of both body sections can be filled with grout by passage of grout only through the passage proximate the end anchor head of the first body section and through the tube connecting the ducts of the first body section and the second body section.

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Raleigh, NC, United States of America

John Richard Crigler