Micropiles

Micropiles

In order to support foundations, micropiles safely and sustainably transfer compressive loads into load-bearing strata.

These piles can be constructed in places with limited access and are used for a variety of purposes.

Characteristics:

In places with limited access, micropiles can retroactively rebuild and improve foundations.
In weak soils, more capacity can be attained by applying post-grouting inside the pile shaft.
In approach slabs to tunnels and station boxes, tension micropiles can be employed to reduce slab thickness and enable significant savings on concrete and reinforcement.

Micropiles are used in:

In places with limited access, like cramped basements, beneath bridge decks, or where barge installation is required, micropiles can be installed into load-bearing strata using specialised lightweight drilling equipment.

Test loads are run to demonstrate the chosen system’s suitability for the conditions at the chosen location.

How Micropiles work?

As a passive foundation system, micropiles are used. A spacer is used to centre a Special Threadbar after it has been placed into a borehole. The borehole is then pressure-grouted or filled with cement mortar starting at the bottom.

Corrosion protection:

By means of skin friction, the grout transmits force to the earth while simultaneously offering typical corrosion protection. Double corrosion protection micropiles are offered in areas where the cement grout cover is insufficient and the foundation soil or groundwater is corrosive.

The alkaline environment of the surrounding cement grout covering is utilised to protect the reinforcing steel, just like in solid construction. With harsh environments, the steel reinforcement is covered in plastic corrugated sheathing, and the annular area is factory-grouted. As cracks in the coverage can lessen the passivation effect of the cement grout, this design is employed in cases of tensile pressures, such as permanent uplift control.

System Flexibility:

Micropiles are skin friction piles that are capable of transferring alternating, compression, and tensile stresses. The special Threadbars’ continuous threadform makes it possible to cut, pair, or terminate the bars at any place.

Features:

Hollow or self-drilling solid threadbars
16 to 75 mm solid threadbar diameters
diameters of self-drilling hollow bars of 25 to 103 mm
installed in areas with limited access
compression or tension loadings
Options either permanent or transient