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Steep embankments next to roadways and near water levies usually need erosion control measures to help vegetation get restarted immediately after construction. Several types of mats are used to do this. Some look like a thick green blanket of man-made material, some are concrete squares attached to a nylon netting. Most mats require some type of anchor to hold them in place to keep them from blowing off from wind or washing away from rain or flowing water.
Percussion-driven anchors are used to hold the mats to the ground and are usually installed perpendicular to the mats on the steep slope. Many different sizes of these anchors are available to do the job. They consist of an arrowhead-shaped aluminum or steel casting about 3-4 inches long, attached to a thin wire cable that is usually 3 to 8 feet in length.
A hardened steel drive rod, normally 4-6 feet in length and ¾” to 1” diameter are used to push the anchors deep into the ground, with the cable following with the anchor. The anchors are normally installed in a 3’ by 3’ grid over the entire surface of the erosion control area. Construction Accessories, Inc. builds several models of its JackJaw® puller to facilitate the installation of the anchors. The JackJaw® models, JJ0206 or JJ0226, are used to easily extract the reusable drive rods from the ground. Then, the same JackJaw® puller is used to pull up the cable to set the anchor and lock it into the locking plate. These steps are done in seconds, saving hundreds of hours of installation time. Both models use a special fine-tooth jaw to prevent damage to the cable while setting the anchors and locking the plate to the cable. The JackJaw® 226 has become the most popular model as it has double-wide jaws that make it
easier to grab the thin anchor cables.
Some projects (such as US Army Corp of Engineer levy jobs) require a percentage of the anchors to be tested for the holding force of the anchor. Construction Accessories Inc. builds a JackJaw® model JJ0228 that is used with a digital load cell that can directly measure and record the holding force and preload force on the cable and anchor. Using this method saves hundreds of hours of testing.
JackJaw® pullers are manufactured by Construction Accessories, Inc. in Waynesville, Ohio.
More information is available from Bob Anderson at 937-609-8937 or by email to bob@jackjaw.com Anchors and erosion control materials are available from Gripple, Fleximat, Propex Operating Co., Western Excelsior Corp., and MacLean Power Systems.
