FM 5-434 PDF

Figure Clearing vegetation and trees is usually necessary before moving and shaping the ground. Clearing includes removing surface boulders and other materials embedded in the ground and then disposing of the cleared material. Ensure that environmental-protection considerations are addressed before conducting clearing operations.

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Figure Clearing vegetation and trees is usually necessary before moving and shaping the ground. Clearing includes removing surface boulders and other materials embedded in the ground and then disposing of the cleared material.

Ensure that environmental-protection considerations are addressed before conducting clearing operations. Specifications may allow shearing of the vegetation and trees at ground level, or it may be necessary to grub removing Dozers stumps and roots from below the ground.

Project specifications will dictate the proper clearing techniques. Plan clearing operations to allow disposal of debris in one handling. It is best to travel in one direction when clearing. Changing direction tends to skin and scrape the trees instead of uprooting them or allowing a clean cut. Table shows average clearing rates for normal area-clearing jobs.

Increase the Table values by 60 percent if the project requires strip- type clearing common in tactical land clearing. Engineers perform tactical land clearing as a combat support function intended to enhance and complement mobility, firepower, surveillance, and target acquisition.

Table Adverse conditions slopes, rocks, soft ground can reduce these rates significantly. Moving the dozer, with the blade slightly below ground level, will usually remove small trees and brush. The blade cuts, breaks off, or uproots most of the tree and bends the rest for removal on the return trip. A medium tractor with a dozer blade can clear and pile about 0. To remove a medium-size tree 7 to 12 inches in diameter , raise the blade as high as possible to gain added leverage and then push the tree over slowly.

As the tree starts to fall, back the dozer quickly to avoid the rising roots. Then lower the blade and drive the dozer forward, lifting out the roots. The average time for a medium tractor with a dozer blade to clear and pile medium trees is 2 to 9 minutes per tree. Removing large trees 12 to 30 inches in diameter is much slower and more difficult than clearing brush and smaller trees.

First, gently and cautiously probe the tree for dead limbs that could fall. Then, position the blade high and center it on the tree for maximum Dozers leverage. If possible, push the tree over the same as a medium tree. However, if the tree has a massive, deeply embedded root system, use the following method Figure : 1. Cut roots on side one. Cut side two. Cut side three. Build ramp on side one. Average clearing time: Push tree over.

Start on the side opposite the proposed direction of fall, and make a cut deep enough to sever some of the large roots. Make the cut like a V-ditch, tilted downward laterally toward the roots. Step 2. Step 3. Step 4. Build an earth ramp on the same side as the original cut to obtain greater pushing leverage. Then push the tree over and, as the tree starts to fall, reverse the dozer quickly to avoid the rising root mass. After felling the tree, fill the stump hole so that it will not collect water.

Dozers FM The average time for a medium tractor with a dozer blade to clear and pile large trees is 5 to 20 minutes per tree. The time required to clear and pile massive trees requiring this four-step procedure will often be more than 20 minutes each. NOTE: The roots on the fourth side may also need to be cut. ROOTS Mount a rake on the dozer in place of the blade to remove roots and small stumps. The teeth will catch the belowground roots and the surface brush left from the felling operation, while the soil remains or passes through.

Never operate clearing tractors too close together. Do not follow a tree too closely when pushing it, because when it begins to fall, its stump and roots may catch under the front of the dozer. The two methods for estimating production for clearing and grubbing projects are the quick method and the tree-count method. Quick Method Table , page , shows quick estimates for normal area clearing.

Use the quick method only when a detailed reconnaissance and a tree count are not possible. Step 1. Determine the size of the area to clear in acres. Determine the size and number of dozers available. Determine the maximum size of the trees to clear. Determine the time required hours per acre for clearing, based on dozer size and tree size see Table Step 5. Determine the efficiency factor for the work. Operators require breaks, and there are always secondary delays for minor equipment repairs.

Therefore, actual production time per hour is something less than 60 minutes. In the case of a well-managed job, expect 50 minutes of production time per hour.

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