The Lichtenberg Dam is located in the Eastern Ore Mountains and serves the drinking and industrial water supply as well as flood protection. The Lichtenberg Dam is operated by the State Dam Administration of the Free State of Saxony (LTV). The
LTV is a state-owned enterprise according to §26 SäHO and is responsible, among other things, for the maintenance and operation of state-owned dams.
The Lichtenberg Dam consists of the main dam (barrier structure) and the complex structure with the corresponding operating facilities. The dam structure was built as a rockfill dam with asphalt outer seal.
The water is abstracted via the complex structure, which includes the flood relief, the raw water extraction and the bottom outlets. The Lichtenberg Dam (main dam) is classified as a class 1 dam.
Ancillary facilities are the Dittersbach dam, the Burkersdorf and Dittersbach reservoirs, the E/MSR house at the dam, gauges and water quality measuring points as well as the pumping station.
The overall project consists of the following award units:
The allocation unit VE1 includes the CEF1 measure of the LBP "temporary ponds". Temporary amphibious ponds (ZS=490.50 m above sea level) with "big bags" are to be built at two tributaries into the main dam before the start of the damming of the main dam.
The allocation unit VE2 includes the avoidance measure V5 measure of the LBP "Geotube". Geotubes for the retention of sediments during the damming are to be built and operated with adaptation work in the toss basin, including dismantling and disposal of sediments and plastics after emptying the basin.
The allocation unit VE3 includes the measures in the waterside construction site. The access roads in the storage space of the main barrier must be upgraded or manufactured, a fan dam and a water drainage system with RL DN1200 must be built in the storage space and a permanent control fitting must be installed at the bottom outlet of the pre-dam.
The VE4 award unit includes the measures in and on the complex structure (KBW). On the complex structure, crack repairs of the concrete surfaces must be carried out with liquid plastic, a full‐surface tower outer seal with plastic sealing membranes (KDB) must be manufactured, the tower head façade must be renewed
and the tower head bearing. There are dismantling/assembly of the external hydraulic steel construction, the assembly of the epilimnion relief pipe (ELE), dismantling/assembly of pipelines and fittings. For the connection joint KBW/ABW asphalt external seal, the sealing of the joint and leakage measuring devices
produce.
The measures from VE3 (pipelines, partly. Catch dam, possibly gravel in the storage space) are to be dismantled.
The allocation unit VE5 includes the measures on the dam structure (ABW) of the main dam. It is necessary to rebuild the dam crest, to create a full-surface seal with KDB with drainage of the KDB into the control passage of the hearth wall, to build measuring pillars on the air side of the dam and a staircase on the airside slope.
The VE6 allocation unit includes I&C measures for VE3 to VE5 and includes, among other things, the installation of cables, wires, cabinets and luminaires.
The allocation unit VE7 includes the avoidance measure V6 measure of the LBP "Mowing of sediment surfaces". The sediment surfaces are to be mowed 2x per year with the basin emptied and 1x before the start of the test dam.
The VE8 award unit includes the dismantling of CEF1 measures (see VE1). After the test dam has been completed and the new congestion target has been achieved, the measures erected within the framework of the VE1 award unit must be dismantled and disposed of.
Services of the local construction supervision for civil engineering structures. Scope of services according to procurement documents, task definition and service description for local construction supervision.