Radial stakeout (surveying)

 

Radial stakeout

Each curve's table is computed as described in Chapter C. Horizontal Curves.

Following are radial chord tables for each curve in Example (2) (computations aren't shown).

Curve 1
	Sta	Defl ang	Chord
EC	54+10.64	15º00'00"	301.58
	54+00	14º28'36"	291.29
	53+00	9º33'34"	193.51
	52+00	4º38'32"	94.31
BC	51+05.59	0º00'00"	0.00

 

Curve 2
	Sta	Defl ang	Chord
EC	58+12.43	27º30'00"	386.54
	58+00	26º38'57"	375.47
	57+00	19º48'17"	283.63
	56+00	12º57'37"	187.77
	55+00	6º06'57"	89.109
BC	54+10.64	0º00'00"	0.00

 

Stakeout procedure

Measure Ti and To from the PI along the tangents to set the BC1 and EC2.

Stake Curve 1

Setup instrument on BC1.

Sight PI with 0º00'00" on the horizontal circle.

Stake curve points using the curve table.

Stake Curve 2

Setup on PCC

Sight BC1 with -(Δ1/2) = -15º00'00"=345°00'00" on the horizontal circle, Figure D-14a.

Inverse the scope to sight away from the BC1, Figure D-14b.

Rotating right to a horizontal angle of 0º00'00" orients instrument tangent to the curves at the PCC, Figure D14c.

Stake curve points using the curve table.

Last point should match the previously set EC2.

a. Sight BC1 with  -(Δ1/2) reading

b. Inverse telescope

c. Rotate to 00°00'00"

Figure D-14 Orienting at PCC