DPA screw piles

Screw piles type DPA (Drilling Push Aside) is an in-ground formed and soil-displacing screwed pile system, with only a limited amount of excavated soil (potentially contaminated soil). The production is low-vibration, which is important when producing near adjacent structures that are sensitive to settlements and/or vibrations.

Application

  • Particularly suitable for residential and utility construction, and other new buildings where disturbance to the surrounding area needs to be limited.
  • Suitable for urban renewal projects where foundations must be made vibration-free near adjacent buildings or properties.
  • An alternative to non-soil-displacing screw piles where excavated soil severely contaminates the construction site or cannot be removed or disposed of.
  • Causes less noise disturbance than driven pile systems, making them applicable for the expansion of existing and occupied buildings.
  • Applicable in soil conditions or loadings where a long reinforcement cage is necessary, which can be centrally placed in the pile with the required coverage.

Features

  • Soil-displacing, with only limited excavated soil.
  • Low-vibration, therefore well-suited near adjacent structures sensitive to settlement and/or vibrations.
  • Noise-friendly, resulting in less disturbance to the surroundings and suitable near residences, schools, public buildings, etc.
  • Pile head is poured up to the working level and can be finished above the working level to the desired height.
  • Pile length can be immediately adjusted to the ground conditions: the pile is typically installed to the calculated screw-in level.
  • Adjustments in pile specifications possible until just before work commencement.
  • Batter positions: backward 5:1 / forward 10:1.
  • Loadable both in tension and compression.
  • Pile system is low-vibration.
  • Reinforcement possible along the entire length.
  • Reinforcement is installed in the shaft before concreting.
  • Bearing capacity factors assessed and established from load testing by the Building and Housing Supervision Netherlands committee.
  • Competitive compared to soil-removing piles due to greater bearing capacity and a 'clean' construction site.

Vroom Funderingstechnieken has extensive experience with  DPA screw piles and provides advice on the application possibilities of this pile type and other screw pile systems.

Quality Control

Vroom Funderingstechnieken manufactures DPA screw piles according to a procedure established for Vroom Funderingstechnieken as part of internal quality control, nationally applicable standards, and execution conditions.

Control of Geotechnical Bearing Capacity

DPA screw piles are typically installed to the calculated screw-in depth. The required drilling moment is measured for assessment and recognition of the existing soil conditions.

Control of Pile Technical Bearing Capacity

All DPA screw piles are checked for continuity after pile manufacturing. Additional inspection can visually occur after excavation of the pile head. The concrete quality can additionally be checked by drilling and testing cores from the manufactured piles.

Let Us Advise You

Vroom Funderingstechnieken devotes the utmost care to the creation of our brochures and website. However, no rights can be derived from the content. If you use information from our brochures or our website without verification or further advice from Vroom Funderingstechnieken, you do so at your own risk.

Vroom Funderingstechnieken accepts no liability for the accuracy and/or suitability of the information for the intended application. For questions about the application of our products in concrete projects, we advise you to contact our sales department.

DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles
DPA screw piles

Features

  • Soil-displacing, with only limited excavated soil.
  • Low-vibration, therefore well-suited near adjacent structures sensitive to settlement and/or vibrations.
  • Noise-friendly, resulting in less disturbance to the surroundings and suitable near residences, schools, public buildings, etc.
  • Pile head is poured up to the working level and can be finished above the working level to the desired height.
  • Pile length can be immediately adjusted to the ground conditions: the pile is typically installed to the calculated screw-in level.
  • Adjustments in pile specifications possible until just before work commencement.
  • Batter positions: backward 5:1 / forward 10:1.
  • Loadable both in tension and compression.
  • Pile system is low-vibration.
  • Reinforcement possible along the entire length.
  • Reinforcement is installed in the shaft before concreting.
  • Bearing capacity factors assessed and established from load testing by the Building and Housing Supervision Netherlands committee.
  • Competitive compared to soil-removing piles due to greater bearing capacity and a 'clean' construction site.

Vroom Funderingstechnieken has extensive experience with  DPA screw piles and provides advice on the application possibilities of this pile type and other screw pile systems.

Quality Control

Vroom Funderingstechnieken manufactures DPA screw piles according to a procedure established for Vroom Funderingstechnieken as part of internal quality control, nationally applicable standards, and execution conditions.

Control of Geotechnical Bearing Capacity

DPA screw piles are typically installed to the calculated screw-in depth. The required drilling moment is measured for assessment and recognition of the existing soil conditions.

Control of Pile Technical Bearing Capacity

All DPA screw piles are checked for continuity after pile manufacturing. Additional inspection can visually occur after excavation of the pile head. The concrete quality can additionally be checked by drilling and testing cores from the manufactured piles.

Let Us Advise You

Vroom Funderingstechnieken devotes the utmost care to the creation of our brochures and website. However, no rights can be derived from the content. If you use information from our brochures or our website without verification or further advice from Vroom Funderingstechnieken, you do so at your own risk.

Vroom Funderingstechnieken accepts no liability for the accuracy and/or suitability of the information for the intended application. For questions about the application of our products in concrete projects, we advise you to contact our sales department.

Technical data

Manufacturing

  1. Positioning of DPA drill with hydraulic drilling motor.
  2. Screw installation rotates clockwise through intermediate layers.
  3. Screw installation rotates clockwise to the correct depth.
  4. Installation of reinforcement over the requested length.
  5. Filling the core of the tube with concrete mix.
  6. Concrete mix during manufacturing to at least 1 m above working level. The tube is pulled out of the ground in a stationary or slightly clockwise rotating manner.
  7. Finishing the pile, if necessary.

Reinforcement

B500B quality.
Pile reinforcement, dimensioned based on load data by the structural engineer. Spiral hoop reinforcement results in a significantly stiffer reinforcement cage, hence less deformation.

Shaft reinforcement is suspended at height in the screw tube before concreting.

Any additional head reinforcement is inserted immediately after pile manufacturing.

Bearing Capacity

The pile class factors have been determined with the help of load tests carried out by Geomet from Alphen aan den Rijn and positively assessed by Building and Housing Supervision.

Pile Tip Bearing Factor

αp = 0.56 (trajectory III Koppejan NOT reduced)
β = 1.0
The soil-displacing part of the screw tube screwed into the load-bearing ground.

Shaft Friction Factor

αs = 0.010 (no reductions)
The soil-displacing part of the screw tube screwed into the load-bearing ground.
Tension: αt = 0.009

Load and Deformation Behavior

Within the range of service loads, a settlement behavior that is approximately equal to that of a driven pile.

Loading Spectrum

Pressure up to approximately 2500 kN.
Tension up to approximately 400 kN.
Advice on the bearing capacity of a DPA pile in a particular soil condition can be provided by Vroom Funderingstechnieken.

Available Pile Diameters, Sizes in mm

310, 360, 410, 460, 510.
The pile length depends on the soil condition and pile loadings.
Screw-in depth to be assessed for feasibility by Vroom Funderingstechnieken.

Concrete Quality

In C20/25, C25/30, C30/37, and C35/45 quality.

To top