LAJANURI HPP

LAJANURI HPP

On the LAJANURI RIV.

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

PARAMETERS:
Capacity, MW	113
Power output, GWh	438
Reservoir storage, mln m3	18/25
Rated water discharge, m3/s	100
Discharge through waterways, m3/s	420
Rated head, m	128
TYPE OF REGULATION:	Seasonal
SCOPE OF WORKS:
Excavation, ths m3	1063
Embankment, filling, outlining, drainages and filters, ths m3	678
Concrete and reinforced concrete, ths m3	230
Installation of structural metal elements and mechanisms, ths t	33
YEAR OF START UP:	1961
DURATION OF THE CONSTRUCTION, month	76

1. concrete low-crested dam on Tskenistskali rv.;
2. free-flowing tunnel;
3. reservoir;
4. arch dam;
5. water intake;
6. diversion pressure tunnel;
7. surge shaft;
8. underground power house;
9. tailrace canal

ARCH DAM of LAJANURI HPP

PARAMETERS:
Height, m	69
Including Saddle, m	20
Thickness:
at the crest, m	3.7
at the contact with saddle, m	8
at the contact with foundation, m	13
Arch crest length, m	127
GEOLOGICAL CONDITIONS:
Laminated, fissured limestones in places
SCOPE OF WORKS:
Excavation, ths m3	13
Earth, dumped rock, drainage and filters, ths m3	2.2
Curtain grouting, ths m2	5.6
Contact grouting, ths m3	1.2
Installation of structural metal elements and mechanisms, ths t	2.1

Central Section of ARCH DAM
1. corps pf dam;
2. coarse grate;
3. tubes of low-level water outlet;
4. saddle

DIVERSION FREE FLOW TUNNEL OF LAJANURI HPP

Transfer from Tskhenitskali Riv. to the Lajanuri Riv. Reservoir

PARAMETERS:
Length, m	5524
Inside diameter, m	5
Maximal discharge capacity, m3/s	60
GEOLOGICAL CONDITIONS:
Fissured limestones
SCOPE OF WORKS:
Tunnel excavation, ths m3	551
Concrete lining of tubing grooves, ths m3	23
Tubing installation, ths t	17
Contact grouting, ths m2	576

PRESSURE DIVERSION TUNNEL OF LAJANURI HPP

PARAMETERS:
Length, m	2549
Inside diameter, m	6
Maximal discharge capacity, m3/s	100
GEOLOGICAL CONDITIONS:
First interval – fissured thin-layered limestones, thereafter – coarsed limestones, fissured in places
SCOPE OF WORKS:
Tunnel excavation, ths m3	112
Concrete and reinforced concrete lining, ths m3	28
Contact grouting, ths m2	44

UNDERGROUND POWER HOUSE OF LAJANURI HPP

PARAMETERS:
Width, m	18
Length, m	557
Height, m	56
Maximum depth of occurrence, m	140
GEOLOGICAL CONDITIONS:
Coarse-layered fissured limestones
SCOPE OF WORKS:
Tunnel excavation, ths m3	195
Concrete and reinforced concrete lining, ths m3	98
Contact grouting, ths m2	11
Installation of structural metal elements and mechanisms, ths t	11

Section view of underground power house complex of LAJANURI HPP
1. surge shaft;
2. tailrace tunnel.

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