SETTING GRADE STAKES

CENTER-LINE LAYOUT

SETTING SLOPE STAKES.

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure 14-33.—Cut stake. Figure 14-34.-Fillstake (not on centerline). Figure 14-33 shows a cut stake that also happens to be a center-line marker. Note that station mark is written on the front of the stake and the construction information on the back. On grade stakes other than the center-line stakes, the construction information should be written on the front and the station marked on the back. The stake shown in figure 14-34 indicates that fill operations are to be performed. The letter F at the top of the stake stands for fill. The numerals 24 indicate that 2 ft of fill are required to bring the construction up to grade. Some stakes indicate that no cutting or filling is required. Figure 14-35, for example, shows a grade stake that is on the proper grade and also is a center-line stake. The word GRADE (or GRD) is on the back of the stake, and the crowfoot mark may not be indicated; some surveyors prefer to use a crowfoot mark on all grade stakes. If this Figure 14-35.-Stake on proper grade. grade stake is not a center-line stake, the GRD mark will be written on the front of the stake. SETTING GRADE STAKES.— GRADE STAKES are set at points having the same ground and grade elevation. They are usually set after the center line has been laid out and marked with hubs and guard stakes. They can be reestablished if the markers are disturbed. Elevations are usually determined by an engineer’s level and level rod. One procedure you can use for setting grade stakes is as follows: 1. From BMs, turn levels on the center-line hubs or on the ground next to a grade stake at each station. 2. Reduce the notes to obtain hub-top or ground elevation. 3. Obtain the finished grade elevation for each station from the construction plans. 4. Compute the difference between finished grade and the hub or ground elevation to determine the cut or fill at each station. 5. Go back down the line and mark the cut or fill on each grade stake or guard stake. The elevations and the cuts or fills may be recorded in the level notes, or they may be set down on a construction sheet, as explained later in this chapter. Another procedure may be used that combines the method listed above so that the computations may be completed while at each station; then the cut or fill can be marked on the stake immediately. As before, levels are run from BMs; the pro- cedure at each station is as follows: 1. Determine the ground elevation of the station from the level notes to obtain HI. 2. Obtain the finished grade for the station from the plans. 14-36

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