For operation of hydrology current-meters.
GAUGING CABLEWAYS
- Current-meters used for hydrological surveys are
usually handled through a suspension cable driven
by a hoist, thus allowing flexible and speedy
operation.
In addition to these advantages, the use of a gauging cableway enables the station to be located without regard to existing bridges ans possible recourse to boats.
The Neyrtec trolley-type cableway, controlled from one of the river banks, ensures safe operation even in flooding conditions and makes it easy to place the measuring instrument exactly at any required point and to plot the cross-profile of the river bed by measuring the depth according to a pattern of vertical lines.
Every Neyrtec cableway consists of the following parts:
Fixed
parts
Track cable fastened between the two supports and secured
either to the supports or to anchoring blocks in the
groud.
Two supports consisting of guyed masts or uprights or brackets depending upon bank configuration and cable span (with or without ground anchorties).
Moving parts
Crab travelling on the track cable. Cable winch with two
drums, viz one for tow cable to control cross travel, the
other for the suspension cable to control vertical
travel.
Set of pulleys fitted on crab, winch and supports.
The shape and dimensions of the foundations shown on the diagrams are for guidance only. We can specify the maximum strains on the supports and anchor points but we do not supply drawings of the anchor blocks which depend upon the nature of the ground.
cableways
Two options are available:
ref. 2441 C or C1: cableway with complete masts (H = 2 m)
ref. 2441 D or D1: cableway with mast heads and anchor-ties but no mast bodies (drawing supplied on request).
cableways
| Cableways | Winch ref. |
Max span m |
Max load kg |
Track cable | |||||
| Series | References | Ref. | Max length m |
Dia mm |
Mass g/m |
Breaking load N |
|||
| Portable | 2445 A | 2427 A | 60 | 50 | 2451 D | 70 | 10 | 360 | 57000 |
| Léger | 2442 A 2442 B1 2442 A |
2427 A 2427 A 2427 A |
75 100 70 |
50 50 80 |
2451 D 2451 B 2451 B |
85 115 85 |
10 12 12 |
360 520 520 |
57000 80000 80000 |
| Standard | 2441 C ou D 2441 C1 ou D1 |
2424 A 2424 A |
160 200 |
100 150 |
2451 A 2451 C |
180 220 |
14 17 |
690 1000 |
106000 150000 |
| Longue portée | 2443 A 2443 B 2443 C |
2429 A 2429 A 2429 A |
280 360 400 |
150 150 150 |
2451 E 2451 F 2451 G |
305 385 425 |
20,5 22 23,5 |
1400 1630 1870 |
210000 245000 280000 |
Neyrtec can also supply a cable-puller of 25 kN capacity to set the track cable.
The tow cable is of stainless 18/8 chronmium steel, superflexible type, 3 mm in diameter; weight: 33 g/m; breaking load 5300 N. Il is suitable for any cableway series.
For electric suspension cables and two-drum winches, please refer to leaflets M 241 "Torpedo Sinker" and M 242 "Hand-winches", respectively.
stations