Podrobnosti návrhu
| Název | Execution of special geotechnical work - Bored piles |
|---|---|
| Číslo | prEN 1536 |
| Zdroj | CEN |
| Komise | CEN/TC 288 (Execution of special geotechnical works) |
| Zkontrolujte datum zahájení | |
| K připomínkám do | |
| Oblast zaměření |
Akce
Anotace
1.1 This document establishes general principles for the execution of bored piles as per the execution specifications.
NOTE 1 It is expected that the execution specifications define the execution standard to be applied based on EN 1997 where relevant.
NOTE 2 Piles which deviate from the following clauses in this section can be considered as bored piles provided the execution principles correspond to this document (see Clause 8).
1.2 This document applies to bored piles (see Figure 1) with:
— uniform cross-section (straight shaft);
— telescopically changing shaft dimensions;
— excavated base enlargements; or
— excavated shaft enlargements.
1.3 This document generally applies to bored piles with:
— a shaft diameter 0,3 m ≤ D ≤ 3,0 m;
— a depth to width ratio ≥ 5, with a depth ≥ 5 m;
NOTE This document can apply to bored piles with a shaft diameter of less than 0,3 m or more than 3,0 m where the general principles allow the execution in accordance with this document.
1.4 This document applies to permanent or temporary works for:
— piled foundations,
— retaining walls.
NOTE This document can apply to rigid inclusions for ground improvement, and to cut-off walls.
1.5 This document applies to piles with the following rake (see Figure 2):
— n ≥ 4 (Θ ≤ 14°);
— n ≥ 3 (Θ ≤ 18°) for permanently cased piles
— n ≥ 10 (Θ ≤ 6°) for piles where the reinforcement cage is installed after concrete placement.
prEN 1536:2026 (E)
8
1.6 This document applies to bored piles with the following dimensions of the shaft or base enlargements (see Figure 1):
a) base enlargements:
1) in non-cohesive ground: DB/D ≤ 2;
2) in cohesive ground: DB/D ≤ 3;
b) shaft enlargements in any ground: DE/D ≤ 2;
c) slope of the enlargement in non-cohesive ground m ≥ 3;
1) in non-cohesive ground: m ≥ 3;
2) in cohesive ground: m ≥ 1.5.
1.7 This document applies to:
— single bored piles;
— bored pile groups (see Figure 3);
— walls formed by piles (see Figure 4).
1.8 This document applies to bored piles where excavation methods are either continuous or discontinuous using support methods for stabilizing the excavation walls where required.
NOTE Where a continuous flight auger is used for excavation with partial displacement of soil, the pile is considered a partial-replacement pile and its execution is covered by this document.
1.9 This document applies only to execution methods that allow the designed cross-sections to be produced.
1.10 This document applies to bored piles (see Figure 5) constructed with:
— self-hardening slurries;
— unreinforced (plain) concrete incl. plastic concrete;
— reinforced concrete;
— concrete reinforced by structural elements (reinforcing elements);
— precast concrete (including prestressed concrete) elements or steel tubes where the annular gap between the element or tube and the ground is filled by concrete.
NOTE Concrete can be substituted by grout, where applicable.
prEN 1536:2026 (E)
9
Key
DS
Shaft diameter
DSi
Shaft diameter for a given section (telescopic pile)
DB
Base diameter
Figure 1 — Examples for straight shaft piles and piles with shaft and base enlargement
Key
D
Rake
θ
Angle of pile axis to the vertical
Figure 2 — Definition of the rake
Key
D
Shaft diameter
ai
Centre to centre spacing of the piles
Figure 3 — Examples of pile groups
prEN 1536:2026 (E)
10
a < D
a) Secant pile wall
a ≙ D
b) Contiguous pile wall
a > D
c) Spaced pile wall
Key
a
Centre to centre spacing of the piles
D
Shaft diameter
1
Lagging
p
primary piles
s
secondary piles
Figure 4 — Examples of pile walls
prEN 1536:2026 (E)
11
a) Use of plain concrete
b) Use of reinforced concrete
c) Use of structural elements, steel section or tube
d) Use of precast concrete element as main or supplementary structural member
e) Use of steel tube as main or supplementary structural member
Key
1
Precast concrete element
2
Grout, or sanded grout
3
Temporary casing (extracted)
4
Uncased excavation
5
Unreinforced or reinforced concrete or grout, or sanded grout
D
Shaft diameter
Figure 5 — Examples of bored piles
Instrukce
Tento dokument můžete připomínkovat po jednotlivých částech - stačí u příslušné části dokumentu vyplnit formulář v souladu s pokyny a kliknout na ‚Odeslat připomínku‘.
Prosíme, nepoužívejte vulgární výrazy a nevyužívejte tento prostor pro umisťování reklamy.