Planning

Measure the length and height of the proposed wall and multiply these two numbers to calculate the square meter surface area. Multiply the number of square meter by 12 to obtain the number of blocks required for the S12, R12 and V12 GreenLock retainer blocks(excluding cutting and wastage).

A rule of thumb is, where the wall is less than 1,2m built to a batter of 70° (from horizontal) and where soil and drainage conditions are good and well compacted, there should be no need for an engineer. Where however, the height of the wall exceeds 1,2m, or if problem soils (clay) or a high water table exists, or where a structure is to be erected on top of the retained fill close to the wall, or even load bearing walls, then the
services of an engineer or competent person are required. In such cases, the local authorities should insist on a design and stability certificate from the engineer

Typical Installation

Measure the wall layout & mark the course using string and stakes.
Dig a trench 400mm deep, 600mm wide and create either a compacted gravel or a concrete base 200mm deep. (Gravel foundations are usually sufficient for walls under one (1) meter in height) It is imperative that the foundation is level in all directions.
Place first row of blocks on the foundation ensuring that the concave and convex interlocking ends of the blocks mesh as closely as possible. The blocks must be placed level in all direction on the foundation. If need be and to level the first block row perfectly, one can embed the first block row in a mortar bed.
For steep and high walls the first layers can be filled with concrete and/or steel bars for extra stability.
Place a flexible perforated drainage pipe, 75 – 110mm in diameter, behind the first layer of blocks, wrap this in filter fabric. Ensure that 19mm gravel is wrapped in filter fabric around the drainage pipe. The gravel layer should be at least 400mm wide and 220mm deep. Please note that for proper drainage the drainage pipe assembly must be placed slightly higher than the ground surface area of the front of the retaining wall. Drainage outlet pipes, connected to the main drainage pipe, should be installed intermittent and in accordance to the length of the wall, allowing any accumulating seepage water behind the wall to escape freely.

What is the "OFF SET"
One measures the OFF SET at the beginning of each block row. It is the dimension measured from the edge of the first block of the first row to the edge of first block of the second block row laid and so on.
For the visual effect of a retaining wall it is important to note that the distance / dimension of the OFF SET at the beginning of each block row should always be the same. Even if curves, circles or soft angles are integrated into a wall, this rule applies. For instance if one chooses to lay the first block of the second row of blocks exactly halfway over the joint of the first block row, then each subsequent row should be laid the same way. The GreenLock 12 series is 380mm long the OFF SET dimension would then be 180mm.
It is not important what the OFF SET dimension is, as long as it always the same dimension with each row laid. If one follows this advise the finished wall will look stunning, aesthetically pleasing and important for the eye, with evenly fluted joints. If one does not follow this rule, the wall will not be weaker but it will visually look untidy and create a "dizzy" look.

Important Note:
If a sharp corner, like 45 or 90 degrees corner is integrated into the wall this rule does not apply. For sharp corners and after the first block row has been placed and laid including the corner, the second row of blocks should start with the corner block placed exactly over the bottom corner block using the chosen Set Back dimension. The next blocks are then laid in both directions away from the corner block. The joints between the blocks of each block row will automatically form an evenly distributed fluted pattern over the whole length and height of the finished wall.


To achieve the desired wall angle, refer to the Setback Table to select correct setback distance.
Remember to fill all consecutive blocks and before the next block row is placed, with topsoil if these are to be planted up, and to compact blocks and backfill. Behind all layers there should be a layer of minimum 300mm wide of compacted drainage material, such as free draining sand.
When specified, install geofabric on compacted backfill and wedge against the blocks. Shear keys are to be installed where specified by engineer.
Your wall is now ready either to be planted up or to be left as is.
 

 

G8 Earthlock Installation Guide Lines


Important Notice : Please note when using the G8 Earthlock that it is advisable and usually necessary to use the services of a qualified engineer for the design of any type of water management, permanent and temporary road structures, parking areas, steep drive ways, erosion control and soil stabilizing.

The G8 Earthlock is manufactured as specified or required to either 25MPa or 35 MPa. The 35 MPa blocks are usually used for permanent or temporary road structures, parking areas or where constant exposure to sea water occurs and where particular aggressive conditions are present.
Where both types of G8 Earthlock blocks are used on the same site great care must be taken not to mix the batches up.

Ground Preparation

The maximum performance of the G8 Earthlock relies on it's ability to maintain intimate contact between the blocks, geotextiles and the base material. The G8 Earthlock guarantees intimate contact between the blocks and within the block matrix because of it's all around interlocking ability. Thus the resistance to the shear forces between the blocks and within the block matrix are greatly increased. No other block presently on the market has this feature.

Prior to laying the G8 Earthlock the base material must be profiled to line and level and compacted where necessary, with a compaction depth per layer of 200mm maximum and compaction density equal to the adjoining undisturbed soil, but not less then to within 5% of 95% standard Proctor density. Obstructions such as roots and projecting stones should be removed. Minor irregularities are accommodated by the flexible block matrix but if any block edge or corner of any individual block protrudes by more than 10mm above the surrounding blocks, such blocks should be leveled using a plate compactor, rubber mallet or other suitable equipment. In areas where settlement is expected to be severe due to extremely unstable foundation soil conditions steps should be taken to remove these soils and replace it with select material having proper stability. The natural angle of repose of the in situ material, when subjected to full hydraulic load conditions, must not be exceeded, unless the particular system has specifically been designed to allow for a steeper slope. When preparing the final shape of the ground, cognizance should be taken of the fact that the minimum vertical (concave) bending radii of the G8 Earthlock is approximately 1.0m. Immediately prior to placing the specified geotextile filter underlay, it is recommended that the project engineer inspects and approves the ground preparation.

If not specified by the project engineer, advice on the selection of a suitable geotextile filter material (underlay) should be obtained from a specialist. For heavy application Kaytech Bidim A4 has been used successfully. During the storage the geotextile filter material should be protected at all times from direct sunlight and should be kept in the protective covering until used. Care should be taken that the underlay is not damaged or torn before it's used. If there is mechanical damage a patch with an overlap of at least 600mm in all directions may be used. Underlay should be placed directly onto the prepared and inspected surface area. When placing and joining the underlay longitudinally or transversely, care must be taken to ensure that overlaps between adjoining layers point into the direction of flow (i.e. the layer upstream of an adjoining layer should overlay the adjoining layer), and a minimum overlap of 500mm should be maintained. Staples may be used to secure the underlay from displacing before the blocks are placed.

Installing the G8 Earthlock

Because of the 4 sides interlocking mechanism of the G8 Earthlock it was necessary to provide a small round marker on the one corner top surface with the two male interlocking protrusions to help the installer to lay the blocks in the right direction at all times, thus saving valuable time.

See fig1.1 below:

Earthlock-G8-Block

fig1.1

Although the blocks are self aligning when being installed, it is advisable, for all three possible laying patterns and for visual perfection, to use a line for a perfect block matrix.

The G8 Earthlock are easy laced either with a 8 gauge galvanised wire, a 6 - 14mm polypropylene rope or a 3 - 6mm multi - strand stainless steel cable usually grade L316. The lacing is easily done through the precision aligned 25mm diameter holes. The G8 Earthlock can be laced in the standard lay out as well as in the close mesh lay out pattern. Unless otherwise specified, lacing should always be done in a direction perpendicular to the water flow or the traffic flow direction.

Gentle bends in the block matrix can be achieved by easing the outer edges. In the case of sharp bends blocks should either be cut or suitable concrete filling cast to fill the open gap between the two block faces shaping the change of direction.

On slopes greater than 1 : 2 the blocks may slide on the geotextile. Temporary or permanent anchorage can be achieved with steel pegs driven into the open cavities of the blocks and if permanent filled with a cement mix. Great care must be taken that the steel pegs are driven below the top surface of the block and do not protrude above the block surface.

The open areas of the G8 Earthlock should be filled as specified by the project engineer. Suitable filler material is usually gravel, crusher dust, surrounding soil if suitable or fertile soil if to be planted.

The applications of the G8 Earthlock is usually of a very specialized nature and therefor the services of an qualified engineer should be engaged.

INSTALLATION GUIDELINE - GreenLock V12 Block

Planning

  • Measure the height and length of the proposed wall and multiply these two numbers together to calculate the square meter surface area. Multiply this number by 12 to obtain the number of blocks required for the wall.
  • Retaining walls must comply with local building regulations.
  • A rule of thumb is, where the wall is less than 1,2m built to a batter of 70° (from horizontal) and where soil and drainage conditions are good and well compacted, there should be no need for an engineer. Where however, the height of the wall exceeds 1,2m, or if problem soils (clay) or a high water table exists, or where a structure is to be erected on top of the retained fill close to the wall, or even load bearing walls, then the
    services of an engineer or competent person are required. In such cases, the local authorities should insist on a design and stability certificate from the engineer

Typical Installation

  • Measure the wall layout and mark the course using string and stakes.
  • Dig a trench 400mm deep, 600mm wide and create either compacted gravel or a concrete base 200mm deep. (Gravel foundations are usually sufficient for walls less than one (1) meter in height.) It is imperative that the foundation is level in all directions.
  • Place the first row of blocks on the foundation ensuring that the concave and convex interlocking ends of the blocks mesh as closely as possible. The blocks must be placed level in all direction on the foundation. If need be and to level the first block row perfectly, one can embed the first block row in a mortar bed.
  • Each marker (inset dimple) on the block represents a 10º (ten degree) change in angle. For a twenty degree curve, line up the second marker with the main marker. A maximum turn of 105º can be achieved. The seven markers on the large circumference of the block represent an angle of 45 ° between each marker.

What is the "OFF SET"
One measures the OFF SET at the beginning of each block row. It is the dimension measured from the edge of the first block of the first row to the edge of first block of the second block row laid and so on.
For the visual effect of a retaining wall it is important to note that the distance / dimension of the OFF SET at the beginning of each block row should always be the same. Even if curves, circles or soft angles are integrated into a wall, this rule applies. For instance if one chooses to lay the first block of the second row of blocks exactly halfway over the joint of the first block row, then each subsequent row should be laid the same way. The GreenLock 12 series is 380mm long the OFF SET dimension would then be 180mm.
It is not important what the OFF SET dimension is, as long as it always the same dimension with each row laid. If one follows this advise the finished wall will look stunning, aesthetically pleasing and important for the eye, with evenly fluted joints. If one does not follow this rule, the wall will not be weaker but it will visually look untidy and create a "dizzy" look.

Important Note:
If a sharp corner, like 45 or 90 degrees corner is integrated into the wall this rule does not apply. For sharp corners and after the first block row has been placed and laid including the corner, the second row of blocks should start with the corner block placed exactly over the bottom corner block using the chosen Set Back dimension. The next blocks are then laid in both directions away from the corner block. The joints between the blocks of each block row will automatically form an evenly distributed fluted pattern over the whole length and height of the finished wall.

The 45° marker on the back block lines up with the centre marker on the front block, means that there is a 45 ° angle between the blocks.


The 45° marker on the back block lines up with the 10° marker on the front block giving an angle of 35° between the blocks.


The 45° marker on the back block lines up with the 10° marker on the front block giving an angle of 35° between the blocks.


The 90° marker on the back block is lined up with the middle marker on the front block giving a right angle turn to the wall.

 

  • For steep and/or high walls the first layers can be filled with concrete and/or steel bars for extra stability.
  • Place a flexible perforated drainage pipe, 75-110mm in diameter, behind the first row of blocks, wrap this in filter fabric. Ensure that 19mm gravel is wrapped in filter fabric around the drainage pipe. The gravel layer should be at least 400mm wide and 220mm deep. Please note that for proper drainage the drainage pipe assembly must be placed slightly higher than the ground surface area of the front of the retaining wall. Drainage outlet pipes, connected to the main drainage pipe, should be installed intermittent and in accordance to the length of the wall, allowing any accumulating seepage water behind the wall to escape freely.
  • To achieve the desired angle and setback of the wall, refer to the supplied setback table. (The setback distance is measured from the outermost part of the block. A setback of less than 21mm will allow soil to fall through the block and a setback of 63mm will align the concave and convex sections of alternative layers.)
  • Remember to fill consecutive blocks with topsoil if these are to be planted up and remember to compact blocks and backfill. Behind all layers there should be a layer of minimum 300mm wide of compacted drainage material, such as free draining sand.
  • Your wall is now ready to be planted up or left as is.