Services

HOLLOW STEM AUGER DRILL TO INSTALL CAST IN PLACE GROUTED PILE

Auger cast piling is a deep foundation pile system that is installed by drilling to a specified depth with a continuously flighted hollow stem auger. High strength grout is then pumped through the auger as it is slowly withdrawn thereby displacing the spoils* and leaving a clean column of fluid grout in which a rebar cage is lowered. The cages typically extend from above the piles part way down to the tip with a full length bar in the center. The advantage of the auger cast method of pile installation is that the casting component eliminates the need to use casing in loose or wet soil conditions. McDowell NW, Inc. installs auger cast piles in varying sizes including 12”, 14”, 16”, 18”, 24” & 30” diameters and to depths up to 90 feet.

*spoils are a combination of the soil that is displaced and excess grout.


DRILLED SHAFTS TO SHORE FOR EXCAVATION

Cantilevered soldier piling are a retaining wall system incorporating wide-flange beams and timber lagging. They are used to retain soils, to protect adjacent structures and surfaces during excavation for new construction, and to provide shoring of unstable slopes or to protect existing structures from failing slopes such as a catchment wall. Soldier pile walls may include tie-back anchors to provide additional lateral capacity depending on the type of soils, the height of the excavation and the limits of access. Often times a soldier pile wall is a temporary solution to shore up an excavation until foundation walls are poured. One of the advantages of a soldier pile system with drilled shafts is that the method of installation causes minimal vibration and noise.

McDowell NW, Inc. can assist in providing design for shoring systems as well as value engineering ideas to save money for your project.


PIPE PILE

Pipe piling are a deep foundation system which involves driving various diameter and thickness pipe down to a specified depth for support of above ground structures. The pipe are often capped and filled with concrete or grout mix and may or may not include additional steel reinforcing such as a rebar cage or a center bar. The advantage of pipe piling as in other types of driven pile systems is the absence of spoils material created from the piling installation.


SHORING SYSTEM WITH INTERLOCKING STEEL SHEETS

Sheet piling are a retaining wall system that incorporates installing interlocking steel sheet pile through loose soils into stable soils to enable excavation. The advantage of sheet piling is that they are relatively quick to install and easy to remove. Depending on the depth of the excavation and the make-up of the surrounding soils tie-back anchors or bracing may be included in the design.


DRIVEN WOOD PILING OFFER AN ECONOMICAL ALTERNATIVE

The use of wood piling for deep foundation support is the oldest pile system still in use. A tapered timber pile is driven to a specified depth with a hammer then cut off just above ground level. There are different types of treatment used to preserve wood piling including creosote. Recycled and recertified timber piles can be a very economical option in the right situation as the old-growth; reclaimed timber can be longer lasting than new timber and more economical.