A typical helical screw anchor for a tieback application consists of a 1) lead, 2) one or more extensions and 3) a tieback adapter.
The lead is a solid round corner square shaft with one or more helices or circular plates welded to the shaft. The helices provide the bearing area to support the tieback. The shaft type and size and length are determined by the soil, installation depth and load requirement. The lead is installed with a variety of hydraulic torque motor equipment. The lead (similar to installing a wood screw into wood) is rotated into the soil typically at a 15 degree to 20 degree angle below horizontal and to a suitable depth until competent soil is reached to develop the required tension load capacity.
The location, number and type of helical screw anchors are selected by the engineer or certified MacLeanDixie Distributor or installer. Torque monitoring by a certified MacLeanDixie installer assures each helical pile is installed to the required specification.
Extensions are used to advance the lead to whatever depth is required. The total installed depth may range from near the tieback wall to any distance as necessary.
A special tieback adapter is attached with a bolt to the RCS extension shaft. A bearing plate is placed over the tieback wall. A Williams's thread bar is field cut to make up the necessary connecting distance from the anchor to the bearing plate. Tension load to the anchor can be applied immediately. Alternate terminations are also available.
The lead is a solid round corner square shaft with one or more helices or circular plates welded to the shaft. The helices provide the bearing area to support the tieback. The shaft type and size and length are determined by the soil, installation depth and load requirement. The lead is installed with a variety of hydraulic torque motor equipment. The lead (similar to installing a wood screw into wood) is rotated into the soil typically at a 15 degree to 20 degree angle below horizontal and to a suitable depth until competent soil is reached to develop the required tension load capacity.
The location, number and type of helical screw anchors are selected by the engineer or certified MacLeanDixie Distributor or installer. Torque monitoring by a certified MacLeanDixie installer assures each helical pile is installed to the required specification.
Extensions are used to advance the lead to whatever depth is required. The total installed depth may range from near the tieback wall to any distance as necessary.
A special tieback adapter is attached with a bolt to the RCS extension shaft. A bearing plate is placed over the tieback wall. A Williams's thread bar is field cut to make up the necessary connecting distance from the anchor to the bearing plate. Tension load to the anchor can be applied immediately. Alternate terminations are also available.
