Civil Engineering Construction - DK: Gabions and pitching

 

This specification covers the construction of gabions and stone pitching for the protection of earthworks against

erosion. It covers gabion walls and aprons used as retaining walls, channel linings, and the like and it covers light

to heavy pitching, with and without mortar.

NOTE - The standards referred to in the specification are listed in appendix A.

 

 

 

contract document (NOTE - Items (b) and (c) below may or need not be bound in the document):

Where this specification is required for a project, the following specifications shall, inter alia, form part of the

a) Project specification;

b) SABS 1200 A or SABS 1200 AA or SABS 1200 AD, as applicable; and

c) SABS 1200 D or SABS 1200 DA, as applicable.

 

2.1.2 In addition to the specifications referred to in 2.1 .l, one or more

required for the project:

a) SABS 1200 C;

b) SABS 1200 DE;

c) SABS 1200 DM;

d) SABS 1200 DN; and

e) SABS 1200 G or SABS 1200 GA, as applicable.

 

This specification contains clauses that are generally applicable to the

of the following specifications might be

construction of gabions and pitching.

Interpretations and variations of the specification are set out in portion 2 of the project specification (see 2.1).

 

For the purposes of this specification the definitions and abbreviations given in the applicable of the specifications

listed in 2.1 and the following definitions shall apply:

 

2.3.1 Box: A gabion generally of depth 0,3 m to 1 ,O m, of width 1 ,O m, and of length 2 m to 4 m.

 

2.3.2 Diaphragm: An internal division of a gabion cage that is attached to the bottom, the sides, and, after the

gabion cage is packed with stones, the lid of the cage.

 

2.3.3 Gabion: A cage of galvanized steel wire mesh (with or without PVC coating) that is packed with stones and

is used in material retaining structures and in various situations to counter erosion. (A gabion can be in the form of

a box or a mattress, depending on its dimensions.)

 

 

conductivity of 1 x lO-I4 m/s to 1 x lO-I3 m/s.

 

an hydraulic conductivity of 1 x 10-5 m/s to 1 m/s.

facilitate connections between panels.

-

Gabion cage: An unfilled gabion.

Geomembrane: A sheet material that is highly impermeable to water and typically has an hydraulic

Geotextile: A material in the form of a sheet, a blanket or a net that is permeable to water and typically has

Mattress: A gabion generally of depth up to 0,5 m, of width 1 ,O m or 2,O m, and of length up to 6,O m.

Pitching: Large stones placed systematically on a trimmed earth surface, to counter erosion.

Seivedge/selvage: A boundary or edge for the panels of a gabion cage that is intended to strengthen and

 

 

3.1 Gabions

3.1.1 Stone

3.1.1.1 Quality

Stone shall be clean, hard, unweathered, and free from fissures and flaking. It shall have a relative density of at least

2,65, and

a) when the stone is subjected to the weathering test given in 7.3, the loss of mass shall not exceed 5 %, and,

b) in the case of dolerites, when the stone is subjected to the durability test given in 7.4, the number of stones broken

near their middle shall not exceed 5 %.

3.1.1.2 Size

No stone shall be of such a size that it will pass through a ring of diameter 10 VO greater than the cross-dimension

of the mesh being used for the gabion (dimension b in table 1).

No stone shall be of a size exceeding the maximum size given in column 5 of table 1, and at least 85 Vo of the stones

shall be of a size equal to or exceeding the minimum size given in column 4, appropriate (in each case) to the nominal

depth of the gabion and, when relevant, to the nominal mesh size.

 

 

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