Foundation engineering

Foundation engineering

(Tool deployed : Custom made hollow plunger cylinder - hydraulic return)

Anchor systems

At large construction projects such as for example the realisation of a new port area, corrugated sheet piles which are driven into the ground are a familiar phenomenon. Because they are the base for the quay walls, they must be anchored very firmly in order to support both tensile and compressive effects of the water.

Our customer is a specialist in (grout injection) anchor systems; modular systems that consist of thick-walled steel tubes with a coarse tapered thread across their entire length (for optimum adhesion of grout on anchor pile), as well as coupling sleeves. On the front side the anchor is fitted with a drill bit that can be tailored to the foundation present.

Custom-made testing and pre-stressing

Foundation engineering

Once the anchor system is installed, it is tested. During the construction of a new port area in the Netherlands our customer therefore makes use of a 400 tons hollow plunger cylinder by Holmatro. This cylinder of almost 900 kg is installed from ground level using a crane that is suspended over the combi-wall. During testing, the anchor’s creep value is calculated and is used to show that the anchor meets the set requirements. The full test results, together with the installation data, are recorded in client reports. Once the tests have been completed, the injection anchors are pre-stressed by means of the hollow plunger cylinder. The large dimension of this custom made cylinder takes future changes of the anchor system already into account as well as the literal growth of the components that will be tested and pre-stressed.

Specifications HHJ 400 H 40 :

Foundation engineering
  • article number: 100.122.111
  • tonnage (lifting) (kN/t): 3999/407,7
  • tonnage (pulling) (kN/t): 2444/249,2
  • stroke length (mm): 400
  • closed height (mm): 785
  • center hole diameter (mm): 200
  • weight (kg): 895

Hollow Plunger Cylinders - Hydraulic Return >