DPA-combi screw piles

Screw piles of type DPA-combi are a soil-displacing screw pile system formed in the ground and equipped with a prefabricated pile core. The soil is displaced laterally, so only the drill pipe contains a limited amount of released drilling soil. The production process is low-vibration, which is important when working near buildings that are sensitive to damage from settlements and/or vibrations.

Application

  • Can be particularly applied in residential construction, commercial construction, and other new developments where disturbance to the surroundings needs to be minimized.
  • Are suitable for urban renewal projects where low-vibration foundations are required near adjacent buildings or structures.
  • Are an alternative to non-soil-displacing screw piles and grout injection piles, where released soil or grout severely contaminates the construction site or where released soil cannot or may not be removed.
  • Suitable for underground construction. For example, parking garages, basements, and tunnel structures that need to be built from a higher level down.
  • Generate less noise pollution than driven pile systems, making them applicable for the expansion of existing and in-use buildings.
  • Are applicable in soil conditions or loads where the possibility of washing out a pile formed in the ground is considered realistic.

Characteristics

  • Displaces soil, with only limited emerging drilling soil at the drill pipe and ground level.
  • Low vibration, making it suitable for use near buildings that are sensitive to damage from settlements and/or vibrations.
  • Noise-friendly, resulting in less disturbance to the surrounding area, and suitable for use near homes, schools, public buildings, etc.
  • Pile head is suspended below the working level.
  • Pile length can be directly adjusted to the soil conditions.
  • Adjustments in pile specifications are possible up to the ordering moment of prefab elements.
  • Batter piles available upon request and depending on the situation and pile length.
  • Can be loaded both in tension and compression.
  • Prestressed reinforcement over the entire length.
  • The pile system is known and accepted by the Building and Housing Supervision service and engineers, as well as in Building Standards. Competitive compared to soil-removing and grout-injected piles due to soil-displacing execution, required bearing capacity, and a 'clean' construction site.

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

Quality Control

Vroom Funderingstechnieken manufactures DPA-combi screw piles according to an implementation procedure drawn up for Vroom Funderingstechnieken within the framework of internal quality control, national standards, and execution conditions.
The grout is sourced from certified concrete plants. The prefab concrete elements are produced and supplied by certified manufacturers.

Verification of Geotechnical Bearing Capacity

The DPA-combi screw piles are inserted to the calculated drilling depth during soundings. The required drilling torque is measured to assess and recognize the existing soil strata.

Post-Production (Optional)

Through our own quality control, we can respond adequately to doubts about the pile quality or to client requests regarding the execution.

DPA-combi screw piles manufactured by Vroom Funderingstechnieken can be acoustically measured and subsequently assessed by an independent consultancy firm.

Get Advice

Vroom Funderingstechnieken takes the utmost care in the creation of our brochures and website. However, no rights can be derived from the content. If you use information from our brochures or 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 your intended application. For questions regarding the application of our products for specific projects, we recommend contacting our sales department.

DPA-combi screw piles
DPA-combi screw piles
DPA-combi screw piles
DPA-combi screw piles

Characteristics

  • Displaces soil, with only limited emerging drilling soil at the drill pipe and ground level.
  • Low vibration, making it suitable for use near buildings that are sensitive to damage from settlements and/or vibrations.
  • Noise-friendly, resulting in less disturbance to the surrounding area, and suitable for use near homes, schools, public buildings, etc.
  • Pile head is suspended below the working level.
  • Pile length can be directly adjusted to the soil conditions.
  • Adjustments in pile specifications are possible up to the ordering moment of prefab elements.
  • Batter piles available upon request and depending on the situation and pile length.
  • Can be loaded both in tension and compression.
  • Prestressed reinforcement over the entire length.
  • The pile system is known and accepted by the Building and Housing Supervision service and engineers, as well as in Building Standards. Competitive compared to soil-removing and grout-injected piles due to soil-displacing execution, required bearing capacity, and a 'clean' construction site.

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

Quality Control

Vroom Funderingstechnieken manufactures DPA-combi screw piles according to an implementation procedure drawn up for Vroom Funderingstechnieken within the framework of internal quality control, national standards, and execution conditions.
The grout is sourced from certified concrete plants. The prefab concrete elements are produced and supplied by certified manufacturers.

Verification of Geotechnical Bearing Capacity

The DPA-combi screw piles are inserted to the calculated drilling depth during soundings. The required drilling torque is measured to assess and recognize the existing soil strata.

Post-Production (Optional)

Through our own quality control, we can respond adequately to doubts about the pile quality or to client requests regarding the execution.

DPA-combi screw piles manufactured by Vroom Funderingstechnieken can be acoustically measured and subsequently assessed by an independent consultancy firm.

Get Advice

Vroom Funderingstechnieken takes the utmost care in the creation of our brochures and website. However, no rights can be derived from the content. If you use information from our brochures or 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 your intended application. For questions regarding the application of our products for specific projects, we recommend contacting our sales department.

Technical data

General

  • Battered piles available on request and subject to site conditions and pile length.
  • Available auxiliary equipment: concrete pump, loader and bucket.
  • Noise level of machine approx. 90 dB. The system can be considered vibration-free.

Drilling rig

Continuously adjustable and dependent on the drilling motor:

  • Torque 250 to 500 kNm.
  • Pull-down force 150 to 400 kN.

Grout

Grout strength 25 to 35 N/mm². Grout is placed using a bucket or concrete pump and is not injected under pressure. The pressure in the temporary casing is the static acting pressure. During execution, a calculated volume of grout is placed, and the screw casing is subsequently filled with water.

Precast concrete element

The precast concrete element is equipped with a lifting device at the pile head and chamfered on all four sides. The precast concrete core can be factory-fitted with profiling or cast-in starter bars.

Load-bearing capacity

Pile class factors are determined in accordance with a nationally recognised self-declaration type A1.

Pile base resistance factor

αp = 0.27
β = 1.0
The displacement section of the screw casing is screwed into the load-bearing soil.

Shaft friction factor

αs = 0.020 from pile tip to top of the load-bearing sand layer.
Pile diameter corresponds to the external diameter of the pile.

The displacement section of the screw casing is screwed into the load-bearing soil.
Tension: αt = 0.009

Load and deformation behaviour

Within the range of service loads, settlement behaviour is comparable to that of a displacement pile.

Load spectrum

Depending on diameter and soil conditions, up to approx. 3000 kN compression and 500 kN tension (design value).
Higher loads may be feasible for specific projects in consultation with a geotechnical consultant and Vroom Funderingstechnieken.

Structural aspects

Available pile diameters, dimensions in mm:

  • Square 250 mm 410/460 mm
  • Square 290 mm or octagonal 315 mm 460/510 mm
  • Square 320 mm or octagonal 365 mm 510/560 mm*

* Seek advice on the application of larger pile diameters.
Pile length and applicability depend on soil conditions and pile loads. Feasibility of installation depth to be assessed by Vroom Funderingstechnieken.

Installation

  1. Positioning of the steel temporary casing, fitted with a detachable, sealing screw point. Drill head and screw point are placed in the correct position at ground level.
  2. The hydraulic drilling rig, in combination with the pull-down force, screws the casing to the required depth.
  3. Precast concrete element is inserted once the casing has reached the target depth.
  4. Grout is poured into the casing using a bucket.
  5. The casing is unscrewed while the screw point and the precast element, surrounded by grout, remain in place.
  6. Pile completed, move the rig to the next position.

Share product:

Share product:

To top