Q. What countries do Stent operate in?
A. Stent has area offices covering England, Scotland, United States and Dubai.
Q. What size of contract do Stent carry out?
A. We are interested in carrying out contracts over a wide range in values from £10k to £30million+.
Q. What piling, ground improvement and other techniques do Stent perform?
A.
- Bored piles
- Displacement auger piles
- Continuous Flight Auger piling (CFA)
- Driven precast concrete piles
- Driven steel piles
- Mini piles
- Piles with enlarged heads
- Sheet pile walls
- Diaphragm walls
- Contiguous pile walls
- Secant pile walls
- King post pile walls
Q. What are the pile diameters and maximum depths for each piling technique?
A.
- Bored piles: 450 to 3000mm dia/70m depth
- Displacement auger piles: 350 to 450mm dia/20m depth
- CFA piles: 350 to 1200mm dia/27m depth
- Driven precast piles: 187 to 350mm sq./70m depth
Q. What are the widths and depths available in diaphragm walling?
A. 600 to 1500mm wide/80m depth
Q. What types of retaining wall construction do you offer?
A. Contiguous bored pile walls, interlocking secant pile walls (hard/soft, hard/firm, hard/hard), king post pile walls, sheet pile walls, diaphragm walls and anchored retaining walls.
Q. What testing capability can the company offer?
A. Static maintained, dynamic, rapid and bi-directional pile load testing are all available. Pile integrity testing is also available using sonic echo, transient dynamic response and sonic coring methods. Testing of existing piles for pile re-use has been done.
Q. How large/heavy are the piling rigs?
A. These vary from rig to rig. Track pressures for working platform design may be included in our tender. Rig dimensions are available upon request.
Q. What is the maximum available load?
A. This depends on a number of variables. For piles this would include concrete grade, reinforcement, diameter, characteristics of the ground, performance criteria and factor of safety. Typical maximum working loads are:
Minipiles: up to 750kN
Bored piles: up to 50,000kN
Displacement auger piles: up to 600kN
CFA piles: up to 9000kN
Precast piles: up to 1500kN
Steel piles: up to 5000kN
Q. How close physically can piles be constructed to adjacent structures?
A. We can generally operate with the rig within 1000mm from centre of pile to any structure, and 1500mm at corner positions. For piles larger than 1800mm diameter, these distances will need to be increased. Also these distances may need to be increased for bored piles where sectional casings are being used.
Q. What is the maximum headroom requirement necessary to carry out piling operations?
A. Typically:
Bored piles: 12m (standard 25m)
Displacement auger piles: 6m (standard 25m)
CFA piles: 12m (standard 25m)
Precast piles: 15m (standard 25m)
Minipiles: 2.2m
Consideration may be given to modifying equipment to meet more demanding criteria. Restricting headroom generally lowers the production achievable and increases the cost.
Q. What are the lead times for various disciplines?
A. We usually require a minimum of four weeks, but each case will be considered individually depending on its requirements and rig utilisation at that particular time.
Q. How quickly can you provide a tender?
A. Depending on the quality of information provided and the complexity of the project, we can usually respond within 1 to 2 weeks.
Q. What information do you require in order to submit a firm quotation?
A. Full factual and interpretative site investigation reports, site location plan, pile/column layout, loadings and specification.
Q. What level of insurance cover do you provide?
A. We have a comprehensive package of insurance cover including:
-
public liability
-
contractors all risks
-
professional indemnity
A letter covering details of cover is available on each policy.
