Features of Drill Casing for Pile Foundations
– Permanent/ temporary casings optional
– Diameter up to 5000mm
– All FES casing joints are made from high quality steel with special heat treatment to improve torsional strength
– Forged/ Casted joints are optional
– Computerized machinery is employed to achieve precise measurement.
– Regular FES casing tubes are made from Q355B steel, with joints made from 25CrMo after special heat treatment. Heavy duty material such as NM360 tubes and forged joints are available as options.
Specifications of Double Wall Casing
| D1/D2(mm) | L (m) | a1(mm) | a2(mm) | a3(mm) | ||||
| 2m | 3m | 4m | 5m | 6 | ||||
| Weight(kg) | ||||||||
| 620/540 | 740 | 1080 | 1420 | 1839 | 2186 | 12 | 8 | 40 |
| 750/670 | 905 | 1321 | 1730 | 2234 | 2665 | 12 | 8 | 40 |
| 800/720 | 1026 | 1489 | 1949 | 2417 | 2882 | 12 | 8 | 40 |
| 880/800 | 1070 | 1560 | 2040 | 2650 | 3159 | 12 | 8 | 40 |
| 900/820 | 1154 | 1673 | 2188 | 2711 | 3231 | 12 | 8 | 40 |
| 1000/920 | 1230 | 1780 | 2330 | 3025 | 3604 | 12 | 8 | 40 |
| 1180/1100 | 1590 | 2320 | 3060 | 3972 | 4753 | 16 | 8 | 40 |
| 1200/1120 | 1704 | 2487 | 3276 | 4061 | 4851 | 16 | 8 | 40 |
| 1300/1220 | 1750 | 2560 | 3380 | 4394 | 5245 | 16 | 8 | 40 |
| 1500/1400 | 2630 | 3820 | 5015 | 6492 | 7717 | 20 | 10 | 50 |
| 1800/1700 | 3394 | 4870 | 6347 | 7824 | 9301 | 20 | 10 | 50 |
Note:
(1) The above parameters are for reference only; other sizes as per request.
(2) Single wall casing is optional as per the specific request.
Weld Quality of Permanent and Temporary Casing
Global Shipment of Steel Casings for Bored Piles and Micropiles
Client’s Feedback about Steel Casings
Double Wall Casing vs Single Wall Casing
Double Wall Casing vs Single Wall Casing
| Feature | Double Wall Casing | Single Wall Casing |
|---|---|---|
| Ideal Formation | Unstable or loose soils (sands, gravels, water-bearing strata) | Stable soils or rock (clays, competent rock, consolidated soils) |
| Stability & Support | Provides extra stability for deep or high-pressure drilling | Maintains borehole integrity in stable conditions |
| Fluid & Grouting | Annular space allows effective drilling fluid circulation and grout injection | Limited circulation; grouting less common |
| Extraction | More difficult due to inner drive pipe | Easier removal after drilling |
| Application | Deep shafts, high load projects requiring additional support | Smaller shafts or moderate loads where ease of extraction matters |
Key Takeaway:
- Double Wall Casing → Maximum stability, suitable for deep or loose formations, supports fluid circulation and grouting.
- Single Wall Casing → Simpler, easier extraction, ideal for stable formations and smaller shafts.
