Micropiles
 |
Construction of the grouted threadbar micropile is carried out by BAUER in several stages depending on prevailing ground conditions. Bauer offers two techniques for execution of the borehole into which the threadbar is to be inserted: the rotary drilling and the vibrational driving techniques. In accordance with DIN 4128, grouted threadbar micropiles are tension or compression piles reinforced with full-length steel members consisting of one or more GEWI steel or conventional steel reinforcing bars. Borehole diamaters typically range between 90 mm and 150 mm and are generally smaller than 300 mm. The load bearing capacity of single piles can reach up to 1000 kN. Load transfer to the surrounding soil is achieved by filling and/or injecting boreholes with cement mortar or cement grout. |
|
| Grouting of the borehole is carried out through the drill string during formation of the bore either by rotary drilling or vibratory driving technique. The borehole may be grouted up prior to the installation of the load carrying steel member.The cement grout surrounds the load carrying member along its entire length in the ground. The load is transferred through bond between the load carrying member and the cement grout along the entire length of the micropile or at least part of its length. Bauer owns the General Approval Certificate for grouted threadbar micropiles with load carrying members consisting of steel rebars of 28 mm, 32 mm, 40 mm and 50 mm diameter with continuous ribbed threads rolled onto their surface. An approval certificate for the grouted threadbar micropiles of 63.5 mm diameter with a continuous surface thread has been applied for. Until this will be granted, grouted threadbar micropiles of this diameter will be carried out in accordance with DSI certificates. |
© 2009 by BAUER Aktiengesellschaft. All rights reserved.