SPEL Thundaflo is a heavy duty channel drainage system (aka trench, linear or slot), uniquely designed for the industrial environment – forecourts, forklift working areas, truck loading bays, airports. Available in 125mm, 200mm, & 300mm Widths
Dig Trench and Set Out Reinforcing Cage and Channel Sections
Channel is raised into approximate positions
In position and ready for concrete pour
One concrete pour with no cold joints
The broken down poly-modular drain. The key problem is that the drain has parted company with the concrete surround and imploded. It appears that several attempts have been made to resurrect the drain, a very expensive and unsuccessful exercise!
A close up view of the broken poly-modular drain where the walls of the drain have imploded. We observe this problem occurring with many of these types of drains and is the reason SPEL Thundaflo is reinforced with a 5mm thick steel rim.
Breaking out the damaged poly-modular. A saw cut is made down each side of the broken poly-modular drain and then dug out.
The trench is dug to approx 150mm below the channel depth (200mm wide drain) taking into account the built-in-fall. Holes are drilled for the rebar stirrups.
Rebar is inserted into the holes and cemented with expoxy resin.
Rebar is tied to form stirrups. The bottom of the stirrups need to be about half the distance between the bottom of the channel and the trench bottom. 125mm Width, 60mm from the bottom of the channel & 200mm width, 75mm from the bottom of the channel.
SPEL THUNDAFLO is positioned using the Independent Positioning System (IPS) to adjust the height.
Torsion springs can be attached to the bottom of the fibreglass rod to form a "foot" where soil conditions are unsuitable (either too soft or rocky) for the fibreglass rods to be hammered into the ground.
The fibreglass rods are trimmed to below the surface.
The top torsion spring is engaged to prevent the system from floating during the concrete pour.
Poly is inserted into the frame to prevent the ingress of wet concrete into the channel and assist with screeing.
Fibreglass rod is cut to length and the wedged between the frame and the side of the trench to firmly brace the system. A very flexible and effective method to ensure there is no movement while during the concrete pour.
Start of concrete pour. Note how well the poly insert is preventing the ingress of concrete into the channel. A major hassle to clean if this should occur!
A Single concrete pour is made in two stages. The 1st stage is to the bottom of the channel and final stage is to the top. The is to mitigate upward hydraulic pressure and prevent the system from floating.
Wet concrete everywhere... Note how well the poly insert prevents the ingress of concrete into the channel
Finishing off: The poly insert greatly assist in screeing the concrete.
Poly insert removed, grates are inserted...rock solid for many years
Higher Gradient / Velocieties where Flow Rates are Low.
Super Steep, High Velocity, and Self Cleaning. This is ideal for short runs, particularly entrance Ways where road debris is an issue.