The top 5 things you should know about hollow bar micropiles
What is a hollow bar micropile?
Simply defined, micropiles are heavily reinforced, in small diameter, drilled and installed with neat cement grout.
And hollow bar micropiles are self-drilled, no casing and no dewatering required.
This type of micropile is easily installed in low headroom or restricted access applications.
Onton provides this fully boned, drilled and grouted hollow bar micropiles which had been indicated that their hollow bars are able to meet the load and deflection requirements.
Where a micropile can be utilized?
There are two broad categories for micropile applications.
Structural Support and In-Situ Reinforcement.
As you know,
Structural Support can include foundations, underpinning applications, earth retaining.
And In-situ reinforcement includes applications such as slope stabilization and earth retention, settlement reduction.
What depth and capacity can a micropile achieve?
The micropile was preliminary called "root piles" by its inventor Dr. Pali Radici.
(As the article cover shows)
I was also impressed when onton showed the picture for the first time.
According to recent design, micropiles can penetrate in excess of 50 meters in depth, with a capacity of between 30 and 150 tons per pile.
Furthermore, same way as the tree roots, micropiles can be grouped together to replicate a root mass constructed of steel and grout. The installation of numerous micropiles can significantly increase loads and create a stable structure.
Are there different types of micropiles?
The other routine micropile technique is cased micropiles.
In fact, there are five categories of micropile type A, B, C, D and E characterized by different grouting methods.
Type A piles are done after the hole is filled and although can be used in soil, are more typicall seen in piles socketed into rock.
In Types B, C, and D the grout is pressurized after initial filling.
As you know, hollow bar micropiles belong to Type E. The grout and drill are synchronous so the installation speed is accelerated.
Are hollow bar micropiles suitable for all geotechnical conditions?
Hollow Bar Micropiles are used in growing numbers each year.
It can be applied to more geotechnical conditions by choosing different drill bits.
You can contact onton to ask the menu of bit options for different soil conditions.