Push or vibrate the reinforcment cage into the freshly poured pile 以下压或震动的方式 将钢筋笼置入新灌注的 All Rights Reserved by Bauer 基桩内 Maschinen GmbH
挤土桩施工配套设备
1. 2. 3. 4. 5. 6. FDP- unit 挤 桩 concrete mixer storage 储 concrete pump air compressor 压 excavator 1)
Bauer Full Displacement Pile 宝峨挤土桩 FDP
德国宝峨公司北京代表处
毕元顺 (Arthur BI)
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挤土桩施工 Soil Displacement Piling System
混凝土泵车
Full Displacementour
Displacement pile
挤土桩承载行为经
Standard drilled pile
挤压后,压实土层的表面摩擦力和孔底压力增加
一般钻孔桩
挤土桩
Compacted soil
压实土层
Skin friction
表面摩擦力
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工作期间无需进行挖出物处理 No Spoil Removal during Construction
•
钻孔过程中， 钻土被完全挤压到周围土层
During the drilling process the soil is completely displaced into the surrounding area
•承载区（密实区）的承载力增加30% The load transferring area ( densified area ) is therefore increased by 30 %
•因此表面摩擦力增加30%， 桩基压力增加50-70% This results in an increase of the skinfriction by at least 30 % and the base pressure by 50 to 70 % of the nominal values
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2.
7 °
3. 4. 5.
Full Displacement Pile 挤土桩 - 土层条件
Soil Conditions
SPT N Value 标准贯入试验
min. for FDP: SPT N> 3
ideal for FDP: SPT N: 5 - 25
•由于承载力的增加，使每吨传递荷载的成本降至最低 The increased bearing capacity of the displacement pile leads to optimized cost per tons of transferred load
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挤土桩 510 mm
长螺旋桩 510 mm
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成桩效率高 High Production Rate of Pile Installation
•成桩的速度主要取决于以下两点：
The production rate of pile installation is dependent on:
硬颗粒土
Cohesive soil soft 6 m/min 6 m/min 6 m/min
软粘性土
Cohesive soil stiff
0.5 m/min
1 m/min
2 m/min
硬粘性土
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混凝土泵的工作能力 Capacity of the Concrete Pump
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减少混凝土的过量使用 Reduced Overconsumption of Concrete
limit for FDP: SPT N > 25~30
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工作时无震动 No Vibration during Installation
由于整个工序采用旋转动力及静压力下钻头，所以 不会对施工现场的建筑物及设施产生震动和冲击 Due to the pile installation procedure by rotary drilling and static push down, no vibrations or impacts to adjacent buildings or structures will occur
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FDP (full displacement pile) Negligible spoil carriage
FDP 510 mm in Italy
CFA (continuous flight auger CFA 500 mm in Italy
Skin friction
Skin friction
Skin friction
表面摩擦力 表面摩擦力
表面摩擦力
Base pressure
Base pressure
孔底压力
孔底压力
Rights Reserved by Bauer as a result of compacting the surrounding soil you get an increase of skin friction and base pressureAll Maschinen GmbH
经挤压后,压实土层的 表面摩擦力和孔底压力增加
FDP (full displacement pile) advantages 1. Increase of skin friction and toe resistance due to compaction Therefore more economical pile design (shorter piles and diameters, less steel consumption Low-vibration drilling High daily performances Negligible spoil carriage
•钻孔速度
The drilling speed
•混凝土泵的工作能力
The capacity of the concrete pump
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钻孔速度 Drilling Rate
钻孔的工效取决于： The drilling performance depends on: • 桩的直径 diameter of the pile • 钻具的扭矩及下压力 the applied torque and pull down force on the displacement tool • 土层的密度 density of the soil • 土层挤压度 displaceability of the soil 估计的工作效率： Estimated production rates: Pile diameter 400 mm 500 mm
Required torque 15 tonm 22 tonm
600 mm 25 tonm
要求扭矩
Required pull down 20 tons 28 tons 35 tons
要求下压力
Granular soil loose 6 m/min 6 m/min 6 m/min
松颗粒土
Granular soil dense 1 m/min 2 m/min 3 m/min
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承载力高 High Bearing Capacity
•挤土使周围的土层形成一个高密度的土层 The displacement of the soil volume.into the surrounding ring area by 100% results in a highly densified area
•
由于无需将土输出地表， 因此 -很适合被污染的地区 -工地现场灵活性很强 -无挖出土的装载及运输，降低成本
•As there is no soil transported to the surface this piling system is ideally suitable for: - working in contaminated areas - excellent manoeuvrability on site - cost reduction due to no soil loading and transport
Concrete pump
The tool formed of a lower auger tip, the middle displacement part and an upper auger section with counter rotating flights. 钻头由三部分构成, 下螺旋钻头，中间挤土 部分及上部逆向螺旋钻