Vibrated HBF-type piles - Vroom Foundation Technology
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Vibrated HBF-type piles

Vibrated HBF-type piles are highly suited to projects in the fields of residential construction, construction of public utilities, infrastructure and the energy sector. Vibrated piles can be made in long lengths and the delivery time is always short. Rough-boring cuts down on pile-driving vibration, and the use of a noise-reducing jacket during the work gives even more damping.

Vroom Funderingstechnieken (Vroom Foundation Technology) can use various hydraulically-driven pile drivers. Pile drivers for pile lengths up to 24 m, 28 m, 32 m and 38 m up to a maximum of 44 m are used for vibrated HBF-type piles. The use of pile lengths in excess of 38 m can be investigated on request.

Features of vibrated HBF-type piles

  • The pile head can be cast up to the working level and finished to the required height above the working level. 
  • The pile length can immediately be adapted to the nature of the ground; the driving depth is flexible. 
  • Can be delivered quickly. 
  • Adjustments to pile specifications can be made up to shortly before the start of the work. 
  • Raking shores: 
  • Leaning forward up to a maximum of 3:1 - 4:1 
  • Leaning backward up to a maximum of 4:1 - 10:1. 
  • Can be subjected to both compression and tensile forces. 
  •  High bearing loads can be achieved. 
  • Can, under certain circumstances, be finished to the appropriate height. 
  • The system displaces ground. 
  • Reinforcement of the entire pile length possible. 
  • Spacers ensure that the reinforcement offers cover. 
  • The pile system and the bearing capacity coefficients comply with Eurocode 7 (NEN 6743). 
  • The foundation system is respected and well-known to designers and the Netherlands Building Control Committee alike. 
  • Can be used where large numbers of piles are required, or where there are large dimensions or there is a greater load on the piles in relation to other pile types.

Applications of vibrated HBF-type piles

  • Suitable for residential building, commercial building, construction of public utilities and wind turbines. 
  • They are a feasible option in terms of both price and logistics when compared with traditional systems. Certainly where long piles, numerous piles or piles with a high load-bearing capacity are required. 
  • In residential construction the piles can be finished to the required height, so there is no need to reveal the rebar for steel fixing. 
  • They are particularly suited to uneven foundations which give a variable basic level for the pile toe. Cutting off excess length or filling up the pile is not required. The pile is poured up to the working level. 
  • They have a useful form and offer the greatest bearing capacity in relation to other systems. Ideal for areas where there is little bearing capacity at the basic level. 
  • They offer a flexible working situation in and around the foundation pit in urban regeneration projects, where room for manoeuvre is often restricted in terms of supply and storage of pre-fab piles. Liquid concrete and small mixer trucks could be a solution.
  • Installation speed is relatively high.

Special aspects of vibrated HBF-type piles

  • Rough driving is used on sites where the upper layer may conceal obstacles. 
  • Pre-drilling before installing vibrated HBF-type piles can substantially reduce the vibrations caused by conventional pile driving.
  • And a noise-reducing jacket can be used during installation to reduce the noise of pile driving. Accordingly, Vroom Funderingstechnieken developed such a noise-reducing jacket in collaboration with parties including IHC Hydrohammer and TNO Delft.

Quality control

Vroom Funderingstechnieken produces vibrated HBF-type piles as part of internal quality control and in line with nationally-applicable standards.

All vibrated HBF-type piles made by Vroom Funderingstechnieken are acoustically audited and assessed by an independent firm of engineering consultants. Thanks to our own quality-control procedure allows us to respond properly to any doubts there may be on the quality of the piles, or to customer requirements relating to the work.

The concrete for vibrated HBF-type piles is obtained from certified concrete mixing plants that can provide data on compression strength. Additional concrete-quality testing is available by taking samples from the concrete cores of completed vibrated HBF-type piles.

 

Allow us to advise you 

We at Vroom Funderingstechnieken prepare our leaflets and website with the greatest possible care and attention. However, no rights can be derived from such content. If you use information from our leaflets or our website without verification or further advice, this is at your own risk. 

Vroom Funderingstechnieken accepts no liability for the correctness and/or suitability of the information for the purpose you envisage. Should you have any questions about the use of our products for actual projects we advise you to contact our sales department.

Technical specifications Vibrated HBF-type piles

Driving equipment

All pile drivers are equipped with a continuously regulated hydraulic ram with a maximum driving force of 40 - 120 kNm.

  • Hydraulic IHC SC40, SC50, S70, S90, S120
  • Hydraulic Junttan 5000

The IHC S120 ram is particularly suited to heavy-duty driving and, moreover, is able to withdraw items as well as drive them into the ground, as can the IHC S70 and S90. 

Note: All rams are sealed systems, so Vroom Funderingstechnieken can perform the pile driving in a clean and environmentally-friendly way.

Concrete grade

Grades C20/25, C25/30, C30/37 and C37/45.

Reinforcement

B500B grade. 

Dimensioning of longitudinal reinforcement is based on information supplied by the designer. Spiral reinforcement results in a reinforcement cage that is substantially stiffer.

Bearing capacity

The bearing capacity in terms of soil mechanics as per Eurocode 7 (NEN 6743) gives the following parameters:

Pile base coefficient

αp = 1.0 

β = 1.0 for standard tube/foot dimensions Where the foot is larger, a lower coefficient must be used.

Shaft friction coefficient 

αs = 0.014 (withdrawn by jolting) 

αt = 0.012

Load/deformation behaviour

As per Eurocode 7 (NEN 6743, part 1, fig. 6 and 7). 

Load spectrum 

Up to a maximum of 3500 - 5000 kN (calculation value).

Dimensions

Diameter of tube (standard diameter of foot), lengths in mm:

  • 273 (310, 330)
  • 300 (330, 350, 365) 
  • 323 (365, 380, 400) 
  • 356 (400, 410, 435) 
  • 380 (435, 450, 465) 
  • 406 (465, 480, 500) 
  • 457 (520, 535, 560) 
  • 508 (560, 580, 615) 
  • 559 (615, 640, 660, 680) 
  • 610 (660, 680, 710, 740)

The shaft dimensions are fixed measurements.
The feet are standard elements; this is not necessarily mandatory.

Process

Production process HBF cast-in-situ vibro piles  

  1. Steel tube, with foot, at working level.
  2. Steel tube driven in to required level with relevant ram.
  3. Check that the tube is dry and free of contamination: position rebar to required height with spacers.
  4. Fill with concrete mortar.
  5. The tube is withdrawn using the same process.
  6. Finish to the appropriate height where necessary. 

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