Faculty of Computing and Engineering Sciences

Project Brief:

Part 1: Vertical control

As part of the pre-design information required for the re-development of the K- block within the University of South Wales’s Treforest campus, some surveying activities are needed to be implemented around the development site. The survey activities involve a closed levelling survey, where reduced levels are required for various observation/stake points as indicated below and shown in Appendix 1.

Point A – Top of drain cover 1 Point B – Top of RC wall Point C – Top of drain cover 2 Point D – Top of pavement Point E – Top of bottom stairs Point F – Top of drain cover 3 Point G – Top of drain cover 4 Point H – Top of corner kerb Point I – Top of drain cover 5

The reduced level for the Temporary benchmark (TBM) was identified as 69.650m.

Using the rise and fall method sheet in Appendix 2, conduct a levelling survey of the identified observation/stake points around the development site (Refer to practical survey Risk Assessment in Appendix 4).

Record the data obtained from the various line of sights (intermediate sights and fore sights) in your booking

Evaluate the Reduced Levels (RL) on the booking sheet and carry out the mathematical

Verify the accuracy of the levelling survey and comment

Produce a sketch of the vertical section along the line of levelling survey and explain the process/procedures you have taken to accurately carry out the levelling survey (Note: the sketch should not be hand-drawn but produced with applications such as CAD, Excel ).

Part 2: Horizontal control

Using a Total station, the horizontal angular measurement of some identified target points are required to be taken from specific station positions within the K-block site (Refer to practical survey Risk Assessment in Appendix 4).

a) Record the horizontal circle readings for the target points in the booking sheet shown in Appendix 3.

b) Determine the mean horizontal circle readings for the identified target points from your allocated instrument position.

c) Evaluate the mean horizontal angles for the target points.

d) Describe with annotated sketches the process you obtained the horizontal angular measurements on-site using a Total Station from your allocated instrument position.

Proposed K-Block

Observation or stake points

Appendix 2: Levelling survey booking sheet

	Survey of		Instrument
	Surveyor		Datum used
	Date		Datum used

Backsight BS [m]	Intermediate IS [m]	Foresight FS [m]	Rise	Fall	Reduced Level RL [m]	Distance [m]	Remarks
1.572					69.650		TBM
	1.505		0.067		69.717		A
	0.917		0.588		70.305		B
1.494		1.473		0.556	69.749		C
	1.277		0.217		69.866		D
	1.520			0.243	69.723		E
1.639		1.855		0.355	69.388		F
	1.542		0.097		69.485		G
1.561		1.592		0.050	69.435		H
	1.430		0.131		69.566		I
		1.341	0.089		69.655		TBM

Maths check
∑=6.266		∑=6.261	∑=1.189	∑=1.184	Last RL – First RL
∑BS – ∑FS =			∑Rise – ∑Fall =0.005		=0.005		Maths check =OK
							Allowable misclosure check
							±5√n = 10.000mm = 0.01m

Appendix 3: Angular measurement booking sheet

Station position

Target point

Horizontal circle Mean Horizontal Circle Face right Face left Readings

Mean Horizontal Remarks Angles

A 00,07’,44” 180,07’,40” 86,34’,58” 86,35’,02”

B 86,42’,42” 266,42’,46” 86,35’,06”

B 00,33’,42” 180,33’,57” 51,41’,29” 51,40’42”

C 52,15’,08” 232,14’,09” 51,40’,12”

…………

C 00,23’,44” 180,18’,16” 18,28’,40” 18,28’39”

D 18,52’,24” 198,52’,38” 18,28’,39”

D 00,18’,17” 180,18’,16” 45,25’,23” 45,25’,23”

E 45,43’,40” 225,43’,42” 45,25’,26”

Produce a sketch of the vertical section along the line of levelling survey and explain the process/procedures you have taken to accurately carry out the levelling survey.