Post-tension anchor system

• US 5,072,558 A
• Filed: 01/23/1990
• Issued: 12/17/1991
• Est. Priority Date: 04/21/1988
• Status: Expired due to Term

• Current Assignee: Hayes Interests, Inc.
• Original Assignee: VariTech Industries, Inc.
• Inventors: Sorkin, Felix L., Hayes, Norris O.
• Primary Examiner(s): Safavi, Michael
• Application Number:
  US07/468,574
• Time in Patent Office: 693 Days
• Field of Search: 52/223 L, 52/223 R, 52/230
• US Class Current: 52/223.13
• CPC Class Codes: B29C 45/14 incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles B29C45/1671 takes precedence
• CPC Class Codes: E04C 5/12 Anchoring devices tools or methods for tensioning in situ E04G21/12

Abstract

A tendon tensioning anchor comprising a base member having a tubular section extending therefrom, a plastic encapsulation in surface-to-surface contact with the exterior of the base member, and a heat shield fastened within the plastic encapsulation adjacent an end of a tubular section extending outwardly from the base member. The plastic encapsulation opens at the end of this tubular section opposite the base member. The plastic encapsulation further comprises a tubular portion formed at the side of the base member opposite the tubular section and extends outwardly perpendicular to the base member. The heat shield is a rigid member having an outer diameter corresponding to the outer diameter of the tubular section. The heat shield has an interior surface formed therein for receiving a portion of a sealing cap. The present invention also includes an extension tubing fitted to the end of the tubular portion of the plastic encapsulation. A seal is fastened within the other end of the extension tubing so as to create a liquid-tight seal with a tendon passing therethrough.

Claims

1. A tendon tensioning anchor comprising:

a base member having a tubular section extending therefrom, said tubular section having a sloping annular interior wall for receiving an end of a tendon;

a polymeric encapsulation in surface-to-surface contact with an exterior surface of said base member and an exterior surface of said tubular section, said polymeric encapsulation having a receiving area extending outwardly beyond an end of said tubular section; and

a heat shield embedded within said polymeric encapsulation adjacent an end of said tubular section, said heat shield being an annular member of a material having greater heat resistance than said polymeric encapsulation.

2. The anchor of claim 1, said polymeric encapsulation opening at the end of said tubular section opposite said base member, said polymeric encapsulation exposing said sloping annular interior wall, said heat shield positioned within said polymeric encapsulation at said opening, said heat shield exposing said sloping annular interior wall.

3. The anchor of claim 1, said polymeric encapsulation further comprising:

a tubular portion formed at the side of said base member opposite said tubular section and extending outwardly perpendicular to said base member.

4. The anchor of claim 1, said base member having a plurality of holes extending through the thickness of said base member, said polymeric encapsulation extending through said plurality of holes so as to seal the walls of said holes from the external environment.

5. A tendon tensioning anchor comprising:

a base member having a tubular section extending therefrom, said tubular section having a sloping annular interior wall for receiving an end of a tendon;

a polymeric encapsulation in surface-to-surface contact with an exterior surface of said base member and an exterior surface of said tubular section; and

a heat shield fastened within said polymeric encapsulation adjacent an end of said tubular section, said polymeric encapsulation comprising a material injection-molded directly to said base member, said tubular section, and said heat shield, said polymeric encapsulation being in airtight juxtaposition with the exterior surface of said base member.

6. The anchor of claim 5, further comprising:

a reinforcing rib member extending outwardly from the exterior of said tubular section to said base member, said polymeric encapsulation surrounding said rib member.

7. The anchor of claim 5, said heat shield comprising:

a circular member having an outer diameter corresponding to the outer diameter of said tubular section, said heat shield for the attachment of a sealing cap.

8. The anchor of claim 5, said heat shield comprised of a metal material.

9. The anchor of claim 5, said heat shield comprising a rigid member having an interior receiving area formed therein, said interior receiving area for receiving a portion of a sealing cap.

10. The anchor of claim 9, further comprising:

a sealing cap having a size sufficient to accommodate the end of a tendon, said sealing cap being in engagement with said interior receiving area of said heat shield.

11. The anchor of claim 10, said sealing cap having an outwardly projecting surface, said outwardly projecting surface for engaging said interior receiving area of said heat shield.

12. A post-tension anchor system comprising:

an anchor;

a polymeric encapsulation in surface-to-surface contact with an exterior of said anchor, said polymeric encapsulation having a tubular member extending perpendicularly outwardly from said anchor, said polymeric encapsulation comprising a material injection-molded directly to said anchor, said polymeric encapsulation in airtight juxtaposition with the exterior of said anchor; and

a seal fitted to an end of said tubular member, said seal for receiving a tendon extending through said tubular member in liquid-tight relationship.

13. The system of claim 12, said anchor comprising:

a base member having a tubular section extending therefrom, said tubular section having a sloping annular interior wall for receiving the end of a tendon.

14. The system of claim 13, said polymeric encapsulation in surface-to-surface contact with the exterior of said base member and the exterior of said tubular section, said polymeric encapsulation opening at the end of said tubular section opposite said base member.

15. The system of claim 13, further comprising:

a heat shield fastened within said polymeric encapsulation adjacent an end of said tubular section, said heat shield for retaining a sealing cap therewithin, said heat shield comprised of a material having greater heat resistance than said polymeric encapsulation.

16. The system of claim 15, said polymeric encapsulation comprising a material molded directly to said base member, said tubular section, and said heat shield.

17. The system of claim 15, said heat shield comprising:

a member having an outer diameter corresponding to the outer diameter of said tubular section, said heat shield being of a heat-resistant metal, said heat shield having an interior surface for receiving a portion of a sealing cap.

18. A post-tension anchor system comprising:

an anchor;

a polymeric encapsulation in surface-to-surface contact with an exterior of said anchor, said polymeric encapsulation having a tubular member extending perpendicularly outwardly from said anchor; and

a seal fitted to the end of said tubular member, said seal for causing a liquid-tight seal with a tendon extending through said tubular member, said tubular member comprising an extension tubing slidably engaging the exterior surface of a tubular portion of said polymeric encapsulation, said seal attached to the end of said extension tubing opposite said tubular portion of said polymeric encapsulation, said seal comprising;

a ring-like portion abutting the end of said extension tubing;

a first cylindrical portion extending outwardly from said ring-like portion, said first cylindrical portion in surface-to-surface contact with the interior wall of said extension tubing; and

a second cylindrical portion interior of said first cylindrical portion, said second cylindrical portion extending from said ring-like portion, said second cylindrical portion opening so as to receive a tendon.

19. The system of claim 18, said seal being of an elastomeric material, said first cylindrical portion being heat sealed to the interior wall of said extension tubing.

20. The system of claim 18, said first cylindrical portion and said second cylindrical portion extending from said ring-like portion in a V-shaped patter.

21. The system of claim 18, each of the ends of said first cylindrical portion and said second cylindrical portion opposite said ring-like portion being bevelled.