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OFFSHORE LOCATION BY CHAINING - 14070_225
Figure 10-31.Trigonometric solution for pile No. 61.

Engineering Aid 1 - Advanced Structural engineering guide book
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line from transit setup  A through piles 1, 2, 5, 10, 16, and 25. AB measures 50/sin 60°40´, or 57.35 feet. This, then, is the distance between adjacent transit setups on the base line. The distance from the base line to the first offshore pile  in  any  line  also  may  be  determined  by right-triangle solution. For pile No. 1 this distance is prescribed as 50 feet. For piles 2, 3, and 4, first solve the triangle  A2L for 2L, which is 100/tan 29°20´, or 177.95  feet.  The  distance  from  2  to  Q is  150  feet; therefore,  QL measures 177.95 – 150, or 27.95 feet. QD  amounts   to   27.95/tan   60°40´,   or   15.71   feet. Therefore,  the  distance  from  transit  setup  D to pile No. 8 is 50 + 15.71, or 65.71 feet. Knowing the length of QL and the distance from setup point B to pile No. 3 by solving the right triangle  LB3 for B3. You can determine the distance  E9 by solving the determine  the  distance  F15, G22, and H23 by  solving the right triangle  AN10 and  proceeding  as  before.  For pile No. 24, the distance I24 amounts to 50 tan 29°20´, or 28.10 feet. OFFSHORE  LOCATION  BY TRIANGULATION For  piles  located  farther  offshore,  the triangulation method of location is preferred. A pile location  diagram  is  shown  in  figure  10-30.  It  is presumed that the piles in section  X will be located by the method just described, while those in section  Y will be  located  by  triangulation  from  the  two  control stations shown. The  base  line  measures  (1,038.83  – 433.27),  or 595.56 feet, from control station to control station. The middle line of piles runs from station 7 + 41.05, right triangle  M5A and proceeding as before. You can making an angle of 84° with the base line. The piles Figure 10-30.—File location diagram. 10-28







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