The BST and BST-7 series of hammer grabs have been deisgned for the preparation of medium to large diameter bored piles foundations in terrains of variable consistency.
The BST hammer grab comes in two types: “C” and “M”, and can be equipped to carry out excavations ranging from a minimum nominal diameter of 850 mm up to a maximum of 1750 mm; whilst for the BST-7, the minimum is 1750 mm and the maximum is 2250 mm.
| BST-C | 850 | 1050 | 1250 | 1550 | 1750 | |
|---|---|---|---|---|---|---|
| Feasible pile diameter | mm | 1000 | 1200 | 1500 | 1800 | 2000 |
| Nominal jaw diameter | mm | 850 | 1050 | 1250 | 1550 | 1750 |
| Height open jaws | mm | 3160 | 3740 | 3880 | 4105 | 4360 |
| Height closed jaws | mm | 3540 | 3630 | 3755 | 3980 | 4210 |
| Grab weight | kg | 3210 | 3520 | 3830 | 5020 | 6240 |
| BST-M | 850 | 1050 | 1250 | 1550 | 1750 | |
|---|---|---|---|---|---|---|
| Feasible pile diameter | mm | 1000 | 1200 | 1500 | 1800 | 2000 |
| Nominal jaw diameter | mm | 850 | 1050 | 1250 | 1550 | 1750 |
| Height closed jaws | mm | 3630 | 3835 | 4110 | 4325 | 4385 |
| Closed valves height | mm | 3460 | 3650 | 3865 | 4070 | 4185 |
| Grab weight | kg | 3110 | 3410 | 3700 | 4870 | 6250 |
| BST-7 | 1750 | 1950 | 2250 | |
|---|---|---|---|---|
| Feasible pile diameter | mm | 2000 | 2200 | 2500 |
| Nominal jaw diameter | mm | 1750 | 1950 | 2250 |
| Height open jaws | mm | 4900 | 4950 | 5050 |
| Height closed jaws | mm | 5150 | 5200 | 5300 |
| Grab weight | kg | 8190 | 8390 | 8790 |
