A brilliantly simple Foundation Method

Transcription

1 BAUER Ductile Pile

2 A brilliantly simple Foundation Method Grouted skin friction piles End-bearing piles

3 Non load-bearing soil stratum System Description The Bauer Ductile Pile (BDP) is a simple, fast and highly effective deep foundation system. Manu factured from high-strength ductile cast iron, the driven pile system guarantees high quality and a safe foundation. The 5 or 6 m long pile sections can be joined together to form a pile shaft of any length without the use of special tools. After driving, the BDP is cut down to the specified pile cut-off level and the offcut is reused as lead section for the next pile. De pending on prevailing soil conditions, Bauer ductile piles are constructed either as end-bearing or as skin friction piles with grouted annulus. During pile installation, the technique allows the pile length of each individual pile to be optimised in line with locally prevailing ground conditions. Load-bearing soil stratum Rock formation

4 Advantages of Ductile Driven Piles 1. Low capital investment for pile-driving plant and equipment 2. Simple site setup, only light plant and equipment (18-30 tonne hydraulic excavator or MBG 12 leader rig, high-impact hydraulic hammer, possibly concrete pump and silo) 3. Low requirements for working platform, due to light and versatile equipment 4. Negligable amount of on-site traffic, such as deliveries of large volumes of concrete, steel reinforcement and off-site removal of drill spoil 5. Pile installation in close proximity to existing buildings, pile clearance of 40 cm to existing buildings possible 6. Simple pile driving even in restricted site conditions 7. Low level vibrations during installation (peak particle velocity 2 mm/sec, compared with 20 mm/ sec for conventional driven precast concrete piles) 8. The load-bearing stratum is determined during pile driving, making on-site optimisation of pile length possible 9. Quality assurance of each individual pile as a result of pile driving criterion Bored Pile vs. Driven Ductile Pile Practical example: Provision of 265 load transfer points, each with a design load of 2,750 kn; prevailing soil conditions: medium dense sands. Bored Pile Bauer Ductile Pile (BDP) Pile type 1 x bored pile of 880 mm diameter 2 x BDP 170 x 9.0 mm Plant and equipment requirements BG 18 H (value as new approx. 700,000 EUR) Ø 880/800 bored pile, kelly drilling Daily production 80 m 250 m Pile length design Production costs (qs1,k = 55 kn/m² in accordance with EA-Piles Tab 5.13, page 91) Hydraulic excavator CAT 325 (value as new approx. 200,000 EUR), hydraulic hammer HB 2200, drive shank (qs1,k = 110 kn/m² in accordance with EA-Piles Tab 5.26, page 102) 2,750 [kn] / 2.5 [m²/m] / 55 [kn/m²] = 20 m 1,375 [kn] / 0.79 [m²/m] / 110 [kn/m²] = 15.8 m Selected: 1 x bored pile dia. 880 mm Selected: 2 x BDP 170 x 9.0 mm length = 16.0 m Total length = 20 m Total length = 32.0 m Shift costs 3,300 [EUR] / 80 [m/day] x 20 [m] = 825 EUR 2,000 [EUR] / 250 [m/day] x 32 [m] = 256 EUR Material costs Concrete: 0.5 [m²] x 20 [m] x 80 [EUR] = 800 EUR Steel reinforcement, fixed: 40 [kg/m] x 700 [EUR/to] x 20 m = 560 EUR = 1,360 EUR BDP, driving shoes, head plates, concrete = 1,510 EUR Production costs Construction period 2,185 EUR 0.79 EUR/kN 1,766 EUR 0.64 EUR/kN 66 working days 34 working days Result: The Ductile Cast Iron Pile reduced the Construction Period by 50 %! 4

5 Load Bearing Capacities BDP types with design values (N d ) calculated with filling BDP Type [mm] C20/25 C35/45 Ø 118 x kn 730 kn Ø 118 x kn 952 kn Ø 118 x 9.0 1,001 kn 1,080 kn Ø 118 x ,139 kn 1,212 kn 10. Cut down pile to specified cutoff level immediately after installation, resulting in zero waste 11. No finishing works on pile heads, such as trimming back etc., construction of the superstructure can commence immediately after pile installation Ø 170 x 7.0 1,298 kn 1,498 kn Ø 170 x 9.0 1,566 kn 1,748 kn Ø 170 x 9.5 1,632 kn 1,811 kn Ø 170 x ,776 kn 1,950 kn Ø 170 x ,994 kn 2,160 kn 12. No off-site removal of drill spoil (particularly advantageous in contaminated soils) 13. Horizontal forces can be transferred by way of raking piles 14. Construction of tension piles (generally as grouted piles) 15. Low wear and tear costs 16. High production rates with up to 700 m of completed piles per day 17. Short construction period 18. Favourable alternative to Vibro displacement stone columns Driven cast insitu concrete piles Driven precast concrete piles GEWI piles Bored piles etc. Static pile test 5

6 Areas of Application Building construction Industrial buildings Slope stabilisation Silo Foundations Bridge construction Soil nailing Uplift protection Underpinning Bauer Ductile Piles are particularly suited for load transfer in restricted site conditions such as reduced working space or low headroom. They can also be deployed as foundation piles in close proximity to existing buildings (minimum clearance 40 cm). Underpinning works in restricted headroom Foundation works adjacent to an existing building 6

7 Emissions Diagrammatic representation of noise levels for plant and equipment typically deployed on site measured directly at source. The ambient noise level of a construction site is approximately 95 db (A). db (A) Air Hammer Drilling Rig Bauer Ductile Pile Vibrations Vibrating Plate Compactor Heavy Goods Vehicles Vibrations in accordance with DIN : at an impact frequency of 60 Hz Rate of vibration (mm/s) not permitted permitted Highly sensitive buildings (e. g. protected historic monuments or buildings in danger of collapsing) Sensitive buildings (e. g. residential buildings) Non-sensitive buildings (e. g. commercially used buildings, industrial buildings) Bauer Ductile Pile This 3D bar diagram illustrates that the vibrations generated during the installation of Bauer Ductile Piles are harmless for all types of buildings. 7

8 BAUER Spezialtiefbau GmbH BAUER-Straße Schrobenhausen, Germany Telephone: Telefax: BST@bauer.de Quality Management System certified by DQS against DIN EN ISO /2010