SU1211379A1 - Method of constructing dam in presence of landslide hazard - Google Patents

Description

The invention relates to hydrotechnical construction5 namely to methods for constructing Llotin on mountainous sections of rivers, in particular, with the location of a dam on a zigzag section of a river.

The purpose of the invention is to increase the efficiency of control of mudflows, to ensure reliable protection of the dam at the stage of its construction and operation by quenching the impact force of villages, as well as partially arresting the mudflow prior to the construction of the dam.

The drawing shows the erected structure, the plan.

The scheme contains a section of the concave bank I of the river, on the side of which a pit 2, introductory 3 and view 4 channels are being developed simultaneously. A pillar 5 is located between channels 3 and 4. The inlet channel 3 and outlet g channel 4 are separated from the channel-river by bridges 6 and 7, respectively, and under protection of the latter are constructed a ditch 2, channels 3 and 4, and a conduit 8. In the drawing are also marked: 9 - jumper, Yu - dam. 11 - trench.

The method is carried out in the following sequence.

The foundation pit 2, the input 3 and the outlet 4 channels are constructed in the mountain rock massif on the side of the concave bank 1 of the zigzag section of the river bed. The loosening of the rock and its removal from the pit and from the input and output channels are made by drilling and blasting methods using the open method. To create the volume of the pit 2, a powerful explosion is used, then as the area is cleared from the destroyed rock, the drilling and blasting methods of conducting the mine workings are used to expand the pit to the side of the untouched rock mass. At the same time, the excavated pit should have a volume designed for the retention of large outflows of at least one mudflow. The excavation and canals are cleaned during the autumn and winter periods,. using powerful equipment: excavators, bulldozers, scrapers and cars. Rocks are used to build art; 113792

dam 10 or for other purposes.

Jumpers 6 and 7 at the beginning of the injected channel 3 and at the end of the outlet 5 of channel 4 are left so wide that they are resistant to villages at the construction stage of excavation 2, channels 3 and 4 and conduit 8 connecting the excavation section

ten

river beds located below the dam.

The width of the inlet and outlet canals corresponds to the width of the river bed, and their bottom is matched with the bottom of the river bed. The bottom of the excavation is made at the beginning of the channel adjacent to the bottom of the channel, and then obliquely deepening to the meeting line with the opposite wall of the excavation.

The conduit 8, which connects the excavation to the section of the river bed located below the dam, passes through a tunnel. The water line during village danger can be closed at the very beginning from the side of the pit. The construction of the entry channel into the excavation canal and its direction is chosen so that the banks of the canal and the river are mutually continuing along the straight lines, i.e. when filling

bridges that direct the water of the river into the pit of the river, one side of the bridge, adjacent to the left banks of the canal and the river, as if flowing along the riverbed

straight line.

When forming pillar 5 between the channels, a part of it is carried out into the excavation in a rocky intact massif. Practically, the indicated pillar is gradually increasing due to backfilling of the river bed in the interval from the dam, which directs the river water into the pit, to the line of intersection of the left bank of the outlet from the channel pit with the channel.

the river strengthened at the same time a lintel poured across the river bed and guiding the river water into the pit. Construction, dam and simultaneously the pit directly

in front of the dam, jumpers 9 and jumpers 7 located at the end of

water channel. The volume of the excavation in front of the dam 10 in order to retain mainly water, sludge and sand from the mudflow is performed in 1.5-2 times.

for a large compared with the volume action

The first excavation pit 2, which has been preliminarily expanded, was continued to be fully retained using modern, powerful

solid large constituent villages. construction equipment using

For the construction of the dam 10 at the beginning of the 5th, the materials obtained from the foundation pits also use powerful guides.

Claims (1)

METHOD FOR CONSTRUCTING A DAM IN THE PRESENCE OF MILITARY FLOWS, including the construction of a water conduit and its connection with the riverbed, lintels enclosing the foundation pit, and the construction of the dam body under their protection, characterized in that, in order to increase the effectiveness of the fight against mudflows, ensuring reliable protection of the dam on the stages of its construction and operation by damping the shock force of the mudflow, as well as partial retention of mudflow before the dam is built, on the side of the concave bank of the river to the dam, a foundation pit is developed at the same time and it passes M-shaped channels diverging from the channel into the foundation pit and from the foundation pit, leaving the wholly at the same time with the jumper at the beginning of the input channel and the jumper at the end of the output channel separating these channels from the river bed, connect the specified foundation pit with a water conduit to the site the river bed located below the dam, after that they remove the jumper at the inlet channel and at the same time pour the river water into the channel; Nala then erect dam body, while developing a second pit just before the dam, then removed the output jumper channel connecting the first pit with a riverbed. SU „1211379> 1 12