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TOPIC: How to assemble flat pack Gabions

How to assemble flat pack Gabions 2 years 7 months ago #256


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The solution is to use gabions - wire baskets, and to fill them with rocks. 2 years 7 months ago #257


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Uploaded by capetribber on Feb 2, 2010

Severe erosion in the creek threatens to undermine our house and a huge fig tree. The solution is to use gabions - wire baskets, and to fill them with rocks. We use 24 tonnes of rock that had been stockpiled when we first cleared the orchard of rocks. They were a problem then and the solution now!
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Re: The solution is to use gabions - wire baskets, and to fill them with rocks. 2 years 7 months ago #259


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Concrete Cloth just add water to form a strong repair for existing gabions 2 years 7 months ago #258


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Re: How to assemble flat pack Gabions 2 years 7 months ago #260


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Gabions Limitations for use U. S. Army Engineer Watetways Experiment Station, Coastal Engineering Research Center P. 0. Rox 631, Vicksburg, Mississippi 39180 2 years 6 months ago #274


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chl.erdc.usace.army.mil/library/publicat.../pdf/cetn-iii-31.pdf

Gabions were first used over 75 years ago in Italy on river projects.
Today, they have a variety of applications such as retaining walls,
revetments, flexible aprons, and breakwaters.
Gabions have had limited use in the coastal environment where they are
subjected to wave forces and saltwater corrosion. To retard corrosion in salt
water, the wire mesh can be galvanized, PVC coated, or both. However, each of
these measures has limitations. Galvanized coating may be prone to
chipping. PVC coating can be susceptible to wear and cracking, particularly
in cold climates.

2. Potential Limitations:
The following is a listing of gabion limitations extracted from
performance reports of field applications:
A. Baskets may be difficult to fill completely with stone. When the
baskets are not completely filled, flexing occurs, which leads to wire fatigue
and eventual failure.
B. The PVC wire coating may be prone to cracking and wear.
c. Structure lifespan is difficult to predict.
D. If caustic chemicals are present in the area, chemical reactions
involving the wire are possible.
3
FUNCTIONAL APPLICATIONS :
1. Kotzebue and Ninilchik, Alaska:
A. Tests involving gabion performance were conducted in Kotzebue and
Ninilchik, Alaska, in 1978 and 1979. At Kotzebue, gabions were deployed in a
198-ft- long revetment. The PVC coated gabions were lined with filter fabric
and filled with sand. Within a year, the gablons eventually deteriorated from
wave attack, debris, and ice forces. (US Army Corps of Engineers 1981)
B. At Ninilchik, Alaska, a tiered gabion groin was constructed to provide
toe protection for a timber crib groin. The structure performed well
Initially, but later failed when the tier levels shifted because the gablons
were not tied together. A gabion revetment was also constructed to provide
tow protection for a timber revetment, but waves with heights up to 6.5 f t
ripped the baskets apart, causing the loss of fill material, Damage may have
been facilitated by wire corrosion due to the cracking of the PVC coating (US
Army Corps of Engineers 1981). Both gabion structures failed within a year.
c. In both the Kotzebue and Ninilchik tests, the gabion manufacturer’s
deployment recommendations were not followed fully. The gabion fill material
should ideally range in size between 12 and 25 cm. (approx. 5 to 10 in.), but
should certainly be larger than the mesh size to prevent the fill from
escaping, even when a basket liner is used. The gabions should also be tied
together to provide structural strength and integrity.
D. Basket liners should not be used. Although filter cloth was used as a
liner in the previous applications to retain the fill material and reinforce
the gabions, It may have promoted structural Instability by diminishing
permeability, thereby reducing the capacity of the gabions to absorb wave
energy.
2. Geneva State Park, Geneva, Ohio:
A. A three tiered l00-ft-long breakwater with 4- to 10-in. rock fill was
constructed at Geneva State Park, Geneva, Ohio, on Lake Erie in 1979. Filter
cloth was placed under two-thirds of the structure to ascertain settlement
differences. Structure effectiveness was proven after a full tombolo was
created behind. and along the length of the structure. However, after a year
of direct exposure to wave activity and debris, the gabion wire mesh failed.
No significant differences In settlement with or without the filter cloth
underlayer had occurred by that time.
3. Cape May Canal, New Jersey:
A. Cape May Canal, located at the mouth of Delaware Bay on the Atlantic
Ocean, was the site of another gabion structure. Erosion by ship generated
waves necessitated some form of bank protection. In December 1982, 1500 ft of
galvanized and PVC coated gabion revetment was installed utilizing a stepped
slope for increased wave energy dissipation. Gabion rock fill ranged in size
from 10- to 20- cm. (approx. 4- to 8-in.). A 10- to 13-cm. (approx. 4 to 5 in.)
thick filter underlayer with crushed stone was also used.
4
CETN-III-31
12/86
B. The project performed well with minimal maintenance. Failure from
flexing because the baskets were not initially tied to the embankment,
resulted in the slight loss of fill material from baskets at the revetment
ends.
DISCUSSION: In summation, gabions may be useful for certain applications in
the coastal environment. However, there are some critical points to consider.
1. When deciding whether to use gabions, an assessment must be done to
consider the economics associated with their use versus the risks if failure
occurs.
2. Gabions should not be used in high energy wave environments.
3. Gabions should not be used in the active surf zone or where large
amounts of debris are present.
4 . Gabions should not be used on public beaches where injury to bathers
from protruding wire is possible.
5. The manufacturer deployment recommendations should be adhered to
unless there is a sound engineering reason for modification.
6. After installing gabions, a comprehensive inspection and maintenance
plan should be established.
Reward a child for thinking not for storing someone else’s thoughts. Andrew K Fletcher
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