The use of small diameter piles “Minipalo Geo-System®” reduces the size of the perforations and limits the size of the operating machines and the discomfort of a construction site in a residential building.
Reducing the size of the micropiles is compensated by the injection in the soil of polyurethane resins with high resistance and/or by expanding cement mortar specially designed for that purpose (Geo-Xp).
All injected products fill the existing gaps and confer high compression strength to the soil.
The first part – anchoring head – will be injected with epoxy bentonite, a special rheoplastic mortar, specially designed for that purpose and with “Microgrout Injection Anchor”, pourable and quick hardening, capable of transferring the stresses of the metal core to the existing foundations (masonry or c.a.), on a length enough to transfer the load of the building on the mini piles.
The second part of “Minipalo Geo-System®” is inserted into the ground to a certain length according to the limit load established by the design. Then it is injected with a bi-component polyurethane type resin with an expansion degree up to 5/8 times the initial volume, and a compression resistance equal to 30N/mmq; or also with expanding cement mortar “Geo-Xp”, with a compression resistance in free expansion of 7Mpa at 28 gg (EN 196), in order to reach an expansion level equal to 80/100% of initial volume.
The choice of the injection product varies depending on the type of soil to be consolidated; anyhow both allow either to transfer the armor forces on the ground or to consolidate the ground itself, thanks to the capacity for resistance, penetration and expansion of materials employed.
“Minipali Geo-System®” can work independently or can be connected to each other at the summit through various shapes and sizes steel plates (straight, corner, etc), as needed. Plates are connected to the foundation with fixing elements that vary depending on the substrate.
The coupling of plate-“Minipali Geo-System®” is secured with high strength steel bolts, in order to create a crease on the foundation of the working site to avoid any possible subsidence.
It is possible to carry out tests on each “Minipalo Geo-System®” using temporary loads, prior to the final connection to the structure.