Poles for Lighting

Description:

Rocla’s spun poles for lighting are manufactured from high quality durable reinforced concrete in a standard range of lengths from 4,5m to 13.0m. The poles are manufactured with an integral earthing system. The stainless ferrules that flush with the outside of the pole provide an electrical connection to all the poles reinforcement wire.

Reticulation systems for electricity refer typically refer to the supply of 11kV and 22kV power to farming communities and outlying facilities. An advantage to these poles is their resistance to veld fires.

Fibre Poles

Description:

Rocla’s fibre optic poles are designed to support overhead fibre optic cables. The most common lengths are 7m & 9m and 11m for road crossings. Intermediate poles along the line are usually 4kN rated poles while higher ratings might be required at positions where there is a change in the direction of the line and at the start and end of the line.

Concrete poles are best suited for this application due to their inherent strength, no resale value and zero maintenance during the service-life of the infrastructure.

Rocla has successfully supplied these poles throughout South Africa and assure customers with the Rocla promise of quality products designed for specific applications.

Security & Retaining Walls

Description:
The Alfabloc is a very structurally efficient and versatile concept in design. It is a very solid and stable freestanding walling option made up of A-frame style concrete blocks used primarily for retaining and security applications. In the majority of working conditions the Alfabloc units are lowly stressed and provide a robust retaining structure.

Features:
All blocks have a hollow cavity in the centre of the A-shape. This reduces weight, saves cost and provides a secure cavity in which CCTV, electrical, data, etc cables can be securely placed.

The foundation for the Alfabloc system is usually the new or existing concrete surface bed onto which stored materials will be contained. The loads imposed by the Alfabloc units are usually no more than the wheel loads imposed by the mechanical plant utilised to move the stored material.

Advantages of Alfabloc precast concrete walls :

  • Quick and Easy Installation – With a forklift, this can be a ‘one-man’ job.
  • No protruding toe – Allows easy cleaning and unloading. No toe to get caught by vehicles or equipment.
  • Freestanding – No ground fixing required in most loading cases.
  • Load-bearing – Can be loaded from either or both sides.
  • Delivered upright on flatbed trailers.
  • Bay configurations can be changed in minutes.
  • Interlocking – Blocks interlock to form a solid wall.
  • Threaded inserts are cast into the block for connecting or lifting purposes.
  • Entire wall can be dismantled, collected and moved to another location as easily as initial delivery from factory.
  • Indestructible wall – can pump hollow sections with concrete on site.
  • Top Channel – Standard cast in threaded inserts allow fixing of top channel.

Rocla’s new products offer the ultimate product for this application, coupled with quality controlled manufacture, quick and easy installation and saving in materials due to high strength concrete and precast technologies and efficiencies.

Currently these type of fences/walls are constructed using steel fencing, brickwork or in-situ concrete. Either which way, these are all either partially or entirely constructed on site. This, unfortunately, brings with it all the problems normally associated with site manufacture :

  • Are the correct quantities of materials being used ?
  • Site conditions never come close to ideal curing conditions.
  • General poor quality workmanship on site due to insufficient skills and/or supervision.
  • Normal long time frames with delays caused by weather, labour, materials, etc.

Interlocking Joint Pipes

Description:
The Interlocking Joint pipe is a non-watertight pipe for use in stormwater applications. The male/female type joint is formed inside the wall of the pipe, i.e. there is no widening of the pipe, and therefore the outside dimensions of the pipe remain constant. The joint itself is used for centering the pipe during laying operations, thus making the process easier.

The pipes are supplied in lengths of 2,44m or 1,22m and in 50D, 75D and 100D (refer to SABS 677) strength classes. Special strength designs can be accommodated.

Custom-made Products:
Although the Interlocking Joint Pipe is primarily designed for use in a non-watertight pipe-line, rubber collars can be supplied to facilitate a measure of watertightness. These can be used for instances where ingress of groundwater, etc. must be avoided, and the more expensive rubber ring joint pipe is not necessary.

The pipes are manufactured in 2,44m and 1,22m, but can be manufactured in special lengths to customer specification.
The standard strength classes for these pipes are 50D, 75D and 100D (Refer to SABS 677). Special intermediate strengths or heavier loading requirements can be designed and manufactured. These are subject to various material constraints, but will be evaluated by our engineers on an ad hoc basis.

Accessories:
Rubber Collars
Rubber Collars can be supplied in order to improve the watertightness of the pipe-line. Your nearest Rocla branch can supply pricing on these.

Manholes
For access to long lengths of pipe-lines, Precast Concrete Manholes can be used to provide the necessary access for maintenance, inspection, etc.
Precast Concrete Manholes are also manufactured by Rocla.

Areas of Use:
Interlocking Joint Pipes are used primarily in stormwater drainage applications. They are used to move the water from the roads to the out-fall areas, as well as road crossings, where open water flow must pass underneath a road.

They are ideal in applications where maintenance-free, high quality solutions are required.

Handling and Installation:
When handling any concrete products, it is important to remember that, as concrete is a heavy and somewhat brittle material, bumps or shock loads of any description are liable to damage the product. This applies particularly to sharp edges.

When offloading the products on site, the equipment must not damage the products. Larger diameter pipes have a lifting hole in the barrel, which can be used to handle the product. A sling with lifting eye and spreader bar must be used in this application. Smaller diameter pipes have no such lifting-hole, and a 150mm sling passing around the center of gravity of the pipe must be used.

During the installation, the trench or excavation must be prepared to the Site Engineers specification. Once the bedding is in place it is ready for the pipes.

The pipes are lowered into place using the same handling technique as before. Once the pipes are lined up, they are put in place. At times it may be necessary to pull the pipe joint into position to fit into the already laid pipe. This can either be done by hand, or by means of a turfor system, which pulls the pipes together.

If required, the pipes must be sealed from water ingress by means of a rubber collar or bidum strip. Once this is applied, the next pipe can be lowered into position.

Backfilling of the pipe to the engineer’s specification is of utmost importance, as the pipe strength is designed to suit the installed condition. Care must be taken to compact underneath the pipe curvature to ensure a good foundation is in place. For more information on pipe installation, please use the contact us facility, as our staff can be of assistance on site with the installation activities.

Poles for Electricity

Rocla provides economical cast concrete pole systems to the electrical distribution market. Rocla design engineers are available to provide advice on cost effective ways of customising these poles to suite any environment especially those with aggressive soil conditions.

Grease & Oil Separators

Description:
Rocla is proud to announce the introduction to South Africa of a vast and superior range of separators, filters and purifiers for Grease, Oil and Petrochemical contamination of water. Working closely with Alltrap Engineering, the local importers of the ecoTechnic® range of products from Austria, Rocla has developed a full range of concrete tanks to suit every application.

Rocla has designed its own Gravity Separator to offer far superior separation than normal square or rectangular type products. These separators are placed outside and designed to be positioned below ground with manhole access for cleaning purposes. Our separator utilises the longer length of the circumference of a circle to increase initial flow path distance travelled by contaminated water. This, coupled with the specifically designed inlet and outlet to reduce flow velocities, thereby inducing quiescent flow conditions, naturally enhances separation in this chamber. This tank is not SABS tested but available to engineers who take charge of their own designs and require a superior product with which to work.

This tank has been included, modified and/or added-to in order to accommodate all the product offerings that Alltrap Engineering are offering to the South African market. Alltrap products include ecoLine®, ecoStop®, ecoSorp® and ecoSep® as well as full access to new developments in this regard. All ecoTechnic® products have been designed with long maintenance intervals, access from ground level, low-waste disposal costs and future, more stringent standards, in mind. Testing has proven that this range of products far exceeds the strict European Standards (DIN 1999 and EN858) for performance of 5 ppm separation.

Background:
ecoLine® offers a full range of oil water separators from 50gpm (3L/s) to 320 gpm (20L/s) with larger models available on request. ecoSep® units are available up to 320 gpm with custom units available up to 1600 gpm.

These ranges have been designed to separate non-emulsified light liquids or low-water-soluble fluids with a specific gravity below 0.95 (gasoline, diesel, heating oils and other mineral oils) from effluent discharge. A two-step separation process is utilised : gravity separation and removal of small oil particles by coalescing media elements, producing high removal efficiencies allowing virtually no oil emulsion formations to develop. The separated water that leaves the ecoLine® and ecoSep® units has a residual contamination of free petroleum content of less than 5 mg/liter.

ecoStop® is an automatic shut-off valve inserted into the concrete tanks to stop flow when maximum oil storage capacity is reached or when a certain liquid level in the separation chamber is exceeded. The ecoStop® Spill Control System is designed to control spills at petroleum storage or fuelling facilities. A spill situation shuts down ecostop’s® closure valve, preventing the discharge of free oil to municipal sewers or direct discharge outfalls.

ecoStop® maintains the spill on site where it can be contained either below grade (i.e. an underground storage tank or a large diameter pipe) or in an above grade, diked area. In the event of a minor petroleum build-up or a catastrophic type spill, changes in the liquid levels can be monitored by accurate and reliable liquid level sensor alarms. ecoStop® provides the safest and most cost effective method of protecting against unexpected, unpredictable and catastrophic petroleum spills.

Spigot & Socket Pipes

Description:
The Rubber Ring Joint Pipe is a watertight pipe for use in Sewer applications where aggressive groundwater is kept out of the system, or aggressive system contents are kept within. The Spigot and Socket type joint is formed with a widening of the wall of the pipe on the one end.

All sewer pipes are pressure tested to ensure a watertight system.

The Rubber Ring system used compromises a rubber “O” type ring, which is located on the tip of the spigot end of the pipe. When the pipes are joined, the rubber ring is compressed and rolls away from the tip down the barrel.

No lubrication is required nor should it be used. The seal is formed between the Socket (or female end) and the outside of the Spigot (or male end). More detail on the joining operation can be found under Handling and installation.

The pipes are supplied in lengths of 2,44m or 1,22m and in 50D, 75D and 100D strength classes. Special strength designs can be accommodated.

Custom-made Products:
The pipes are manufactured in 2,44m and 1,22m, but can be manufactured in special lengths to customer specification.

The standard strength classes for these pipes are 50D, 75D and 100D. Special intermediate strengths or heavier loading requirements can be designed and manufactured. These are subject to various material constraints, but will be evaluated by our engineers on an ad hoc basis.

“Manhole Pipes” can be manufactured in this range. This is a pipe which has a opening cast into the product for the installation of a Manhole. This allows access to the system without interfering with the flow of the system contents as well as eliminates benching.

“Lobster-back” pipes are used where a pipeline must make a 90degree turn and again, the minimum of flow disturbance is required as well as eliminates benching.

Contact your nearest Rocla branch for details on these products or utilize the contact us facility.

Accessories:
Manholes
For access to long lengths of pipe-lines, Precast Concrete Manholes can be used to provide the necessary access for maintenance, inspection, etc.

The Precast Concrete Manholes are also manufactured by Rocla. See Manholes.

The Rubber Rings used for the joining of the pipes will be supplied by Rocla.

Areas of Use:
Rubber Ring Joint pipes are used primarily in Sewer applications or instances where watertight pipelines are required. They are used to move the system contents from reticulation points to the out-fall areas.

They are ideal in applications where maintenance-free, high quality solutions are required.

Handling and Installation:
When handling any concrete products, it is important to remember that, as concrete is a heavy and somewhat brittle material, bumps or shock loads of any description are liable to damage the product. This applies particularly to sharp edges.

When offloading the products on site, the equipment must not damage the products. Sewer pipes do not have a lifting hole, as the system must be watertight. A 150mm sling passing around the center of gravity of the pipe must be used to handle the product. When placing the product on the ground, it is important to note that the pipe must not rest on the socket portion. The full weight of the pipe must be borne by the barrel of the pipe.

During the installation, the trench or excavation must be prepared to the Site Engineers specification. Once the bedding is in place it is ready for the pipes. The specific area where the socket end would rest must be removed, so that the pipe can be horizontal during installation, and that the pipe can rest on the barrel once in place.

Each pipe must be sealed with a rubber ring. This must be place on the spigot end and located in the correct position as indicated by the locating groove. The rubber ring must be of equal tension around the barrel. This can be attained by inserting a screwdriver, or similar object, between the ring and the pipe, and running the screwdriver around the barrel twice.

The pipes are lowered into place using the same handling technique as before. Once the pipes are lined up, it will be necessary to pull the spigot end into position to fit into the socket end of the already laid pipe whilst the pipe is still suspended. This can either be done by levering the pipe forward, or by means of a tirfor system, which pulls the pipes together.

Once this is completed, and the pipe is correctly sealed, the pipe can be released to lie on the bedding. It must be noted that again, the full weight of the pipe must rest on the barrel only and not on the socket area. The next pipe can then be lowered into position.

Backfilling of the pipe to the engineer’s specification is of utmost importance, as the pipe strength is designed to suit the installed condition. Care must be taken to compact underneath the pipe curvature to ensure a good foundation is in place. For more information on pipe installation, please use the contact us facility, as our staff can be of assistance on site with the installation activities.

Cast poles

Description:

The Rocla cast concrete pole has become a standard for the electrification of South Africa’s townships due to its cost effectiveness. Unlike wooden poles these poles are resistant to vandalism and fire.