Appendix A - Reference pictures :

Lists A - Construction of a tunnel for laying down of a ductile iron pipelines. Work located besides

the desk area of the Swimming Pool near the view station. Different work type is involved such as excavation for tunnel direction, formwork for reinforcement concrete, site suit for concrete and metal work for work place protection and structure for pre-cast tunnel cover.

Below pictures show the pipe work arrangement :

1) Setting line 2) Excavation work for the tunnel 3) Machine for excavation of the tunnel 4) Corner of the tunnel

5) Excavated tunnel 6) Beam structure for tunnel 7) Reinforcement bars for the tunnel 8) Formwork for the concrete work

9) Focus of the reinforcement bars 10) Corner of the reinforcement bars 11) Pipe installation for pumping concrete 12) Elbow of the concrete outlet

13) Vibration work for concrete 14) Dismantling the wood formwork 15) Main frame bracket installation for the pipeline 16) Appearance of the tunnel and pipe

17) Cover of the tunnel 18) Focus of the cover

Appendix B - Reference pictures :

Lists B - The Chinese University of Hong Kong project: Two main ductile iron feed up pipelines of

diameter 200mm for fresh water supply from Tai Po road directed to the main water meter of the University.

Below pictures show the pipe work arrangement :

1) Pipes start from Tai Po Road 2) Two main pipelines constructed by WSD 3) Thrust block constructed by WSD 4) Valve chamber on site suit

5) Two main pipelines from the valve chamber 6) Zoom in of picture 5 7) Existing flush water main near the mentioned fresh water pipelines 8) Pipelines beside the inspection staircase

9) Under the client 's instruction, pipe should be located close to the drainage well to avoid affecting future modification work for slope 10) Zoom in of the picture 9 11) Pipelines extended to the flush water pump house 12) Pipe route continues from picture 11

13) Pipe route continues from picture 12 14) Zoom in of picture 13 15) Pipe route continues from picture 14 16) Pipe route continues from picture 15

17) Pipe enclosed within the thrust block. Note: The thrust block is for supporting the pipelines, withstand the pipe gravity load/dead load and water 's live load 18) Two short-lengthed pipes are reserved for installation of gate valves for on/off control- ling function 19) Meeting point of the two mentioned pipelines 20) Assembly of the main water meter and check valve for main water supply

21) Fresh water main connected unexposed pipeline under the ground, which formed the complete main water supply system

Reference information of the thrust blocks for supporting the pipeline –

Below data recorded the excavated bulk size of the thrust blocks :

Thrust blocks I.D. code Height (mm) Length (mm) Width (mm) Remarks

A 860 890 1240
B 790 780 1190

C 1050 780 1250
D 980 790 1260

E 1000 800 1260
F 930 840 1160

G 960 840 1200
H 820 800 1200

I 800 740 1200
J 1070 770 1240
K 940 760 1240
L 930 760 1220

M 920 770 1200
N 920 720 1100

O 920 760 1100

P 900 740 1200
Q 900 740 1200

R 980 780 1180

S 1100 800 1220
T 1220 770 1760
U 1180 1200 300
V 890 380 380 Average size of thrust block approx. 1,032(H) x 814(L) x 1113(W)

W 890 380 380
5 1600 1470 1070

6 (Valve chamber) 2250 1300 1070

Below pictures show the structure of the thrust blocks :

1) Blinding concrete inside the bulk 2) Structure of R.C. Bar (T12-20 (V)-150) 3) Formwork for thrust block 4) Incompleted thrust block (I.D. Code Q)

5) Completed thrust block (I.D. Code A) (Same pattern as Q) 6) Setting of the pipe & block 7) Completed thrust block (different patter to Q) 8) Completed thrust block of picture 7 as viewing from the top

Pipe from Tai Po Road,
inlets of the valve chamber

9) Formwork for main valves chamber 10) Valve chamber 11) The only R.C. block encloses the two ductile iron pipes

Appendix C - Reference pictures :

Lists C -Installation and repairing of the gas supply main (different diameters) at Public Estate,

New Territory. Works include the high pressure test for main and operating procedures for LPG Compound for gas supply.

Below pictures show the appearance of the gas equipments at the gas supply station :

1) Underground gas store tank before excavation of the bulk 2) Structure of for high pressure gas tank for gas supply only (tank capacity approx. 5 tons) 3) Different gas regulator unit for primary and secondary gas supply (system include the BY - PASS function for emergency operation purpose) 4) Repairing of the under- ground gas main. Work includes the excavation and protection work. The indicated tab is for safety purpose.

5) Ring main for gas supply pipe on the roof

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1) Setting line	2) Excavation work for the tunnel	3) Machine for excavation of the tunnel	4) Corner of the tunnel

5) Excavated tunnel	6) Beam structure for tunnel	7) Reinforcement bars for the tunnel	8) Formwork for the concrete work

9) Focus of the reinforcement bars	10) Corner of the reinforcement bars	11) Pipe installation for pumping concrete	12) Elbow of the concrete outlet

13) Vibration work for concrete	14) Dismantling the wood formwork	15) Main frame bracket installation for the pipeline	16) Appearance of the tunnel and pipe

17) Cover of the tunnel	18) Focus of the cover


1) Pipes start from Tai Po Road	2) Two main pipelines constructed by WSD	3) Thrust block constructed by WSD	4) Valve chamber on site suit

5) Two main pipelines from the valve chamber	6) Zoom in of picture 5	7) Existing flush water main near the mentioned fresh water pipelines	8) Pipelines beside the inspection staircase

9) Under the client 's instruction, pipe should be located close to the drainage well to avoid affecting future modification work for slope	10) Zoom in of the picture 9	11) Pipelines extended to the flush water pump house	12) Pipe route continues from picture 11

13) Pipe route continues from picture 12	14) Zoom in of picture 13	15) Pipe route continues from picture 14	16) Pipe route continues from picture 15

17) Pipe enclosed within the thrust block. Note: The thrust block is for supporting the pipelines, withstand the pipe gravity load/dead load and water 's live load	18) Two short-lengthed pipes are reserved for installation of gate valves for on/off control- ling function	19) Meeting point of the two mentioned pipelines	20) Assembly of the main water meter and check valve for main water supply

21) Fresh water main connected unexposed pipeline under the ground, which formed the complete main water supply system

Thrust blocks I.D. code	Height (mm)	Length (mm)	Width (mm)	Remarks
A	860	890	1240
B	790	780	1190
C	1050	780	1250
D	980	790	1260
E	1000	800	1260
F	930	840	1160
G	960	840	1200
H	820	800	1200
I	800	740	1200
J	1070	770	1240
K	940	760	1240
L	930	760	1220
M	920	770	1200
N	920	720	1100
O	920	760	1100
P	900	740	1200
Q	900	740	1200
R	980	780	1180
S	1100	800	1220
T	1220	770	1760
U	1180	1200	300
V	890	380	380	Average size of thrust block approx. 1,032(H) x 814(L) x 1113(W)
W	890	380	380
5	1600	1470	1070
6 (Valve chamber)	2250	1300	1070


1) Blinding concrete inside the bulk	2) Structure of R.C. Bar (T12-20 (V)-150)	3) Formwork for thrust block	4) Incompleted thrust block (I.D. Code Q)

5) Completed thrust block (I.D. Code A) (Same pattern as Q)	6) Setting of the pipe & block	7) Completed thrust block (different patter to Q)	8) Completed thrust block of picture 7 as viewing from the top
		Pipe from Tai Po Road, inlets of the valve chamber
9) Formwork for main valves chamber	10) Valve chamber	Pipe from Tai Po Road, inlets of the valve chamber	11) The only R.C. block encloses the two ductile iron pipes


1) Underground gas store tank before excavation of the bulk	2) Structure of for high pressure gas tank for gas supply only (tank capacity approx. 5 tons)	3) Different gas regulator unit for primary and secondary gas supply (system include the BY - PASS function for emergency operation purpose)	4) Repairing of the under- ground gas main. Work includes the excavation and protection work. The indicated tab is for safety purpose.

5) Ring main for gas supply pipe on the roof