Archive - News and Events Benefil

Brand name Benefil®
Benefil® fills voids (seawalls, retaining walls, culverts, sewage pipes, pipelines, relining) and is a super-lightweight engineering filler grout. Benefil®, also supports, raises and/or re-levels concrete slabs (floor lifting), ebb and flow systems in greenhouses. Benefil®, fills underground tanks, absorbs hydro-carbons, making tanks safe from explosion.
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Seawalls - Sydney Australia
Benefil Seawalls quaywalls 1, ,Benefil, Hardschuimvullingen, fills voids, seawalls, retaining walls, culverts, sewage pipes, pipelines, relining, a super-lightweight engineering filler grout, BenefilŪ, holle ruimte, floor lifting, floorlift, verzakte vBenefil® fills the erosion voids behind the seawall at Pulpit Point on Sydney Harbour.
The problem confronting Sydney's Hunters Hill Council engineers was how best to grout behind the sandstone seawall at Pulpit Point to compensate for the erosion by harbour tidal action.
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Canal Banks
Benefil Seawalls quaywalls 7,Benefil, Hardschuimvullingen, fills voids, seawalls, retaining walls, culverts, sewage pipes, pipelines, relining, a super-lightweight engineering filler grout, BenefilŪ, holle ruimte, floor lifting, floorlift, verzakte vloRestoration of the canal's locks, particularly those of the Deepcut flight was an amazing achievement. However, both the Society volunteers and the Surrey County Council staff who oversaw the work were on a very steep learning curve and with the benefit of hindsight, it is now clear that some things could have been done better.

Of course it is possible that if we had tried to do better at the time, the locks might never have got rerstored at all. However, the consequences today are that several locks have suffered from water geting round and through the sides of the chambers and eroding the ground. This has resulted in some spectacular holes suddenly appearing and also a number of by-wash pipes collapsing.
The BCA managed to impress the severity of the situation on Surrey County Council, who had funded a programme of work to inject urea-formaldehyde foam into the ground adjacent to the locks. The work was done by a company called GroundSafe based in Norfolk, using a technique developed in Holland. Work done at a Dutch university indicates that the foam injection is environmentally safe and should last for at least 50 years.
Steve Keevil-Jones and his Dutch colleague Martin van Zwolgen operated from a boat containing the tanks of chemicals and assorted pumps.
The first step at each lock was to check for voids in the ground. This was done with the aid of a water jet nozzle attached to the end of a long pole. This was used to probe the ground and appeared to be very effective at finding any dodgy areas - the pole just slid down 7 or 8 feet into the ground.

Once the area to be treated had been identified, the second stage was the actual foam injection, again done by means of a long pipe that was pushed into the ground. The top was sealed by means of earth to try to ensure that the foam filled any underground cavities.
The process seemed to work, as foam could be seen squeezing out between the brickwork in places. It was also noticable that a number of spots in the lower wing walls where water was squirting out, suddenly dried up as the foam went in.