Enguri HPP

Enguri HPP

on the ENGURI RIV.:

CUSTOMER:	Sakmtavarenergo
GEN. DESIGNER:	Hydroproject (Tbilisi)
GEN. CONTRACTOR:	Sakhydroenergomsheni
TECHNICAL ASSISTANCE / SERVICES of GEN. CONTRACTOR:	Orgemergomsheni

PARAMETERS:
Capacity, MW	1300
Power output, GWh	4430
Reservoir storage, mln m3	676/1110
Rated water discharge, m3/s	450
Discharge through waterways, m3/s	2500
Rated head, m	325
TYPE OF REGULATION:	Seasonal
SCOPE OF WORKS:
Excavation, ths m3	4363
Filling, drainages and filters, ths m3	960
Contact grouting, ths m3	1214
Grouting of foundation, ths m2	1199
Curtain grouting , ths m2	34
Concrete and reinforced concrete, ths m3	4083
Installation of structural metal elements and mechanisms, ths t	56
YEAR OF START UP:	1978
DURATION OF THE CONSTRUCTION MAIN BUILDINGS , month :	72

Schematic plan and longitudinal sectional views of Enguri HPP
1. Jvari water reservoir;
2. arch dam;
3. low-level water intake;
4. presure diversion tunnel;
5. water-conduit bridge over the Olori rv.
6. water-conduit bridge over the Eristskali rv.
7. equalizing reservoir;
8. underground power plant;
9. pressure-free discharge tunnel;
10. Gali water reservoir.

ARCH DAM of ENGURI HPP

PARAMETERS:
Height, m	271.5
Including Saddle, m	50
Thickness:
at the crest, m	10
at the contact with saddle, m	52
at the contact with foundation, m	90
Arch crest length, m	605
Thrust block’s length, m	123
Concrete: grade 350
GEOLOGICAL CONDITIONS:
Jointly rock-fissured limestones and dolomites of the Barremain geological tier
SCOPE OF WORKS:
Excavation, ths m3	3432
Embankment, drainage and filters, ths m3	6
Concrete and reinforced concrete, ths m3	3838
Contact grouting, and joint grouting, ths m3	314
Curtain grouting, ths m2	33
Consolidation grouting, ths m3	569
Installation of structural metal elements and mechanisms, ths t	12

Layout of arch dam:
1. access gallery of emergency gate house;
2. diversion tunnel;
3. emergency gate house;
4. water intake;
5. construction tunnel.


Cross-sectional view of arch dam:
1. Leaf gate piers;
2.I stage starting elevation;
3. permanent water-discharging ports;
4. perimeter joint;
5. bottom port openings of the construction stage.

PRESSURE DIVERSION TUNNEL OF ENGURI HPP

PARAMETERS:
Length, m	15050
Including:
Water-conduit bridge over Olori Riv., m	210
Water-conduit bridge over Eristskali Riv., m	91
Inside diameter, m	9.5
Maximal discharge capacity, m3/s	450
Pressure Head:
At the beginning, m	110
At the end, m	175
Maximal deeping, m	640
GEOLOGICAL CONDITIONS:
Initial interval 0,5 km – thin-layer Barrem limestones Next interval 1,5 km – thin-and midlayered limestones of Turon-Senon Thereafter – clay limestones of Mastricht-Data
SCOPE OF WORKS:
Tunnel excavation, ths m3	1700
Concrete and reinforced concrete lining, ths m3	490
Contact grouting, ths m2	452
Consolidation grouting, ths m3	576
Installation of structural metal elements and mechanisms, ths t	9

UNDERGROUND POWER HOUSE OF ENGURI HPP

PARAMETERS:
Length, m	127
Width, m	22
Height, m	51
Maximum depth of occurrence, m	100
GEOLOGICAL CONDITIONS:
Upper calcareous limestones of multiple block structure, fissured in place
SCOPE OF WORKS:
Rock excavation, ths m3	685
Concrete and reinforced concrete lining, ths m3	277
Contact grouting and joint grouting ths m2	331
Consolidation grouting, ths m3	73
Installation of steel structures and hydromechanical equipment, ths t	45

Section-through Center Line of Inguri Generating Unit

FREE FLOW TRAILRACE TUNNEL OF ENGURI HPP

PARAMETERS:
Length, m	3150
Section, m2	10.8x13.2
Maximum discharge capacity, m3/s	450
Maximum depth of occurrence, m	250
GEOLOGICAL CONDITIONS:
Fissured and highly fissured marles chalk calcareous limestones of Mastricht-Data (2200m), marle clays, marle thick layered limestones of Mastricht-Data (950m)
SCOPE OF WORKS:
Rock excavation, ths m3	551
Concrete and reinforced concrete lining, ths m3	139
Contact and joint grouting ths m2	77