Pre-stressed molded wall, and method for creating such a wall

Patent metadata

Field	Value
Publication number	US-9714495-B2
Application number	US-201414772787-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Mar 5, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

The invention relates to a prestressed diaphragm wall in the ground ( 10 ) including a concrete panel ( 52 ), at least one anchor tube open at its upper end ( 38 ) and closed at its lower end ( 36 ) and, embedded at least partially in the concrete panel, at least one cable ( 60 ) extending inside the anchor tube ( 30 ), a lower portion of the cable ( 60 ) being fixed to said tube ( 30 ), and a cable anchoring system ( 90 ), configured to hold the cable in tension ( 60 ) and secure its upper portion ( 68 ) to the upper portion of the concrete panel ( 52 ). It also relates to a method for making a prestressed diaphragm wall.

First claim

The invention claimed is:

1. A method for making a prestressed diaphragm wall in the ground, the method comprising:
an excavation is made in the ground with a profile corresponding to that desired for the diaphragm wall,
at least one anchor tube, open at its upper end and closed at its lower end, is placed in the excavation, so that its lower end is directed toward a bottom of the excavation,
concrete is poured into a volume of the excavation outside said anchor tube, so as to form a concrete panel,
a cable is placed inside the anchor tube,
a lower portion of the cable is fixed to a lower portion of the anchor tube,
after fixing, tension is exerted on the cable so as to place the cable in tension, and
the cable is locked in tension with respect to the concrete panel.

2. The method according to claim 1 , wherein the anchor tube includes a plurality of annular beads formed at its periphery.

3. The method according to claim 2 , wherein the anchor tube has a nominal diameter and, at the beads, a diameter comprised between 1.05 and 1.3 times its nominal diameter.

4. The method according to claim 3 , wherein the anchor tube has a nominal diameter and, at the beads, a diameter comprised between 1.10 and 1.3 times its nominal diameter.

5. The method according to claim 4 , wherein the anchor tube has a nominal diameter and, at the beads, a diameter comprised between 1.15 and 1.25 times its normal diameter.

6. The method according to claim 2 , wherein the annular beads are formed along the lower portion of the anchor tube.

7. The method according to claim 1 , wherein the anchor tube is first fixed to a reinforcement cage, then the anchor tube is introduced into the excavation jointly with said reinforcement cage.

8. The method according to claim 1 , wherein, to fix the lower portion of the cable to the lower portion of the anchor tube, at least the lower portion of the anchor tube is filled with a sealing material, so that the lower portion of the cable is coated by said sealing material.

9. The method according to claim 1 , wherein the cable consists of a plurality of strands and, before inserting the cable into the anchor tube, the strands are spaced from one another using a spacer on the lower portion of the cable intended to be positioned in the lower portion of the anchor tube.

10. A prestressed diaphragm wall in the ground, obtained by implementing the method according to claim 1 .

11. A method for making a prestressed retaining assembly including a diaphragm wall in the ground and a crowning structure capping said diaphragm wall, said method comprising:
an excavation is made in the ground with a profile corresponding to that desired for the diaphragm wall,
at least one anchor tube open at its upper end and closed at its lower end is placed in the excavation, so that its lower end is directed toward a bottom of the excavation,
concrete is poured into a volume of the excavation outside said anchor tube, so as to form a concrete panel,
after hardening of the concrete panel, a crowning structure is made overhanging the upper face of the concrete panel, so that the inside of the anchor tube remains accessible from the upper face of said structure,
a cable is placed inside the anchor tube,
a lower portion of the cable is fixed to a lower portion of the anchor tube,
tension is exerted on the cable so as to place the cable in tension, and
the cable is locked in tension with respect to the concrete panel and to the crowning structure.

12. A prestressed diaphragm wall in the ground, comprising:
a concrete panel,
at least one anchor tube having an upper portion and a lower portion, and open at its upper end and closed at its lower end, and embedded at least partially in the concrete panel,
at least one cable extending inside the anchor tube, a lower portion of the cable being fixed to said tube,
a cable anchoring system, configured to maintain the cable in tension and secure its upper portion to an upper portion of the concrete panel.

13. The diaphragm wall according to claim 12 , further including a reinforcement cage embedded in the concrete panel, the anchor tube being secured to the reinforcement cage.

14. The diaphragm wall according to claim 12 , wherein the anchor tube includes a plurality of annular beads formed at its periphery.

15. The diaphragm wall according to claim 14 , wherein the annular beads are formed along the lower portion of the anchor tube.

16. The diaphragm wall according to claim 14 , wherein the anchor tube has a nominal diameter and, at the beads, a diameter comprised between 1.05 and 1.3 times its nominal diameter.

17. The diaphragm wall according to claim 16 , wherein the anchor tube has a nominal diameter at the beads, comprised between 1.10 and 1.3 times its nominal diameter.

18. The diaphragm wall according to claim 17 , wherein the anchor tube has a nominal diameter at the beads comprised between 1.15 and 1.25 times its nominal diameter.

19. The diaphragm wall according to claim 14 , wherein the beads are positioned one above the other and have the same diameter.

20. The diaphragm wall according to claim 14 , wherein the beads are distributed over a limited length of the anchor tube.

21. The diaphragm wall according to claim 20 , wherein the beads are distributed over a limited length of the anchor tube not exceeding one-third of the total length of the anchor tube.

22. The diaphragm wall according to claim 21 , wherein the beads are distributed over a limited length of the anchor tube not exceeding one-fifth of the total length of the anchor tube.

23. The diaphragm wall according to claim 12 , wherein an inner wall of the lower portion of the anchor tube forms a plurality of annular cavities arranged one above the other.

24. The diaphragm wall according to claim 12 , wherein a sealing material fills at least the lower portion of the anchor tube and coats at least the lower portion of the cable.

25. The diaphragm wall according to claim 12 , wherein the cable consists of a plurality of strands and, in the lower portion of the cable positioned in the lower portion of the anchor tube, the strands are spaced from one another by a spacer.

26. A prestressed retaining assembly comprising:
a diaphragm wall according to claim 12 , and
a crowning structure capping said diaphragm wall, the cable passing through said crowning structure and the cable anchoring system being secured to the upper portion of said structure.

Assignees

• Soletanche Freyssinet

Inventors

• Mellier Erik
• Jeanmaire Thierry
• Loygue Memphis

Classifications

• E02D17/13

  Foundation slots {or slits}; Implements for making these slots {or slits} · CPC title

• E02D11/00

  Methods or apparatus {specially adapted} for both placing and removing sheet pile bulkheads, piles, or mould-pipes (features relating to placing only E02D7/00, to removing only E02D9/00 {; placing apparatus which without special provisions, can be operated to remove, e.g. vibrating drivers E02D7/00}) · CPC title

• E02D17/207

  with means incorporating sheet piles or piles · CPC title

• E02D5/187 Primary

  the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints · CPC title