Sheathing lock end cap

Patent metadata

Field	Value
Publication number	US-10428523-B2
Application number	US-201816172365-A
Country	US
Kind code	B2
Filing date	Oct 26, 2018
Priority date	Aug 4, 2015
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A post-tensioning tendon may include a tension member including a strand and sheath, the sheath having an outer surface. The post-tensioning tendon may also include an anchor coupled to an end of the tension member, the anchor including a tubular extension through which the tension member is passed. The tubular extension may have an engaging surface. The post-tensioning tendon may additionally include a sheathing retention assembly. The sheathing retention assembly may include an outer cap, the outer cap having a forcing surface. The outer cap may be coupled to the tubular extension. The sheathing retention assembly also may include one or more holding elements positioned at least partially within the outer cap. The one or more holding elements may each have a tapered outer surface abutting the forcing surface. The one or more holding elements each may include an inner surface that engages the outer surface of the sheath.

First claim

What is claimed is:

1. A post-tensioning tendon comprising:
a tension member including a strand and a sheath, the sheath having an outer surface;
an anchor coupled to an end of the tension member, the anchor including a tubular extension through which the tension member is passed; and
a sheathing retention assembly including:
an outer cap, the outer cap having an inner forcing surface, the outer cap coupled to the tubular extension; and
one or more sheath holding elements positioned at least partially within the outer cap, the one or more sheath holding elements each having a tapered outer surface engaging the forcing surface, the one or more sheath holding elements each including an inner surface that engages the outer surface of the sheath, wherein engagement of the tapered outer surface with the forcing surface biases the sheath holding elements radially inward into contact with the sheath thereby increasing normal force between the holding elements and the sheath and causing the sheath holding elements to grip the sheath; and
a seal positioned between the outer surface of the sheath and the outer cap.

2. A post-tensioning tendon comprising:
a tension member including a strand and a sheath, the sheath having an outer surface;
an anchor coupled to an end of the tension member by wedges, the anchor including a tubular extension through which the tension member is passed; and
a sheathing retention assembly including:
an outer cap, the outer cap having an inner forcing surface, the outer cap coupled to the tubular extension; and
one or more sheath holding elements positioned at least partially within the outer cap, the one or more sheath holding elements each having a tapered outer surface engaging the forcing surface, the one or more sheath holding elements each including an inner surface that engages the outer surface of the sheath, wherein engagement of the tapered outer surface with the forcing surface biases holding elements radially inward into contact with the sheath thereby increasing normal force between the holding elements and the sheath and causing the holding elements to grip the sheath; and
a seal positioned between the outer surface of the sheath and the outer cap;

wherein the seal is positioned between the outer surface of the sheath and both the outer cap and the one or more sheath holding elements and is also positioned between the one or more sheath holding elements and the tubular extension.

3. The post-tensioning tendon of claim 2 wherein engagement of the tapered outer surface of each sheath holding element with the forcing surface causes sheath holding elements to compress the seal against the tubular extension.

4. A post-tensioning tendon comprising:
a tension member including a strand and a sheath, the sheath having an outer surface;
an anchor coupled to an end of the tension member, the anchor including a tubular extension through which the tension member is passed; and
a sheathing retention assembly including:
an outer cap, the outer cap having an inner forcing surface, the outer cap coupled to the tubular extension;
one or more sheath holding elements positioned at least partially within the outer cap, the one or more sheath holding elements each having a tapered outer surface engaging the forcing surface, the one or more sheath holding elements each including an inner surface that engages the outer surface of the sheath, wherein engagement of the tapered outer surface with the forcing surface biases holding elements radially inward into contact with the sheath thereby increasing normal force between the holding elements and the sheath and causing the holding elements to grip the sheath; and
a seal positioned between the outer cap and the outer surface of the sheath and positioned between the one or more sheath holding elements and the tubular extension;
wherein each sheath holding element includes an end flange extending toward the tubular extension and the seal includes a spacing flange adapted to fit between the end flanges and the sheath.

5. A post-tensioning tendon comprising:
a tension member including a strand and a sheath, the sheath having an outer surface;
an anchor coupled to an end of the tension member, the anchor including a tubular extension through which the tension member is passed; and
a sheathing retention assembly including:
an outer cap, the outer cap having an inner forcing surface, the outer cap coupled to the tubular extension;
one or more sheath holding elements positioned at least partially within the outer cap, the one or more sheath holding elements each having a tapered outer surface engaging the forcing surface, the one or more sheath holding elements each including an inner surface that engages the outer surface of the sheath, wherein engagement of the tapered outer surface with the forcing surface biases holding elements radially inward into contact with the sheath thereby increasing normal force between the holding elements and the sheath and causing the holding elements to grip the sheath; and
a seal positioned between the outer cap and the outer surface of the sheath and positioned between the one or more sheath holding elements and the tubular extension, the seal including a spacing flange adapted to fit between the sheath holding elements and the sheath;
wherein engagement of the tapered outer surface of each sheath holding element with the forcing surface causes sheath holding elements to compress the seal against the tubular extension; and
wherein the seal retains the sheath holding elements in an open position until the outer cap is installed to the tubular extension; and
wherein engagement of the sheath holding elements with the forcing surface biases holding elements radially inward and causes the spacing flange to contact the sheath.

6. The post-tensioning tendon of claim 1 having a plurality of sheath holding elements, wherein the inner surfaces of the plurality of sheath holding elements form an inner face.

7. The post-tensioning tendon of claim 6 wherein the inner face has teeth, wherein the teeth of the inner face contact the outer surface of the sheath.

8. The post-tensioning tendon of claim 1 wherein the outer cap couples to the tubular extension by a coupler selected from the group consisting of a threaded, detent, press lock, bayonet, or tab-and-slot coupler.

9. The post-tensioning tendon of claim 8 wherein the tubular extension has an engaging surface, and wherein the coupler is a tab-and-slot coupler, wherein the tab-and-slot coupler comprises:
one or more slots formed in the outer cap; and
one or more tabs formed on an engaging surface of the tubular extension, wherein the one or more slots receive the one or more tabs.

10. The post-tensioning tendon of claim 8 wherein the coupler is a bayonet coupler, wherein the bayonet coupler comprises:
one or more outer cap bayonet ramps positioned on the outer cap; and
one or more tubular extension ramps positioned on the tubular extension, wherein the outer cap bayonet ramps interconnect with the one or more tubular extension bayonet ramps.

11. The post-tensioning tendon of claim 1 wherein the one or more sheath holding elements are arcuate wedges.

12. The post-tensioning tendon of claim 11 wherein the arcuate wedges each include a partial split.

13. The post-tensioning tendon of claim 4 having a plurality of sheath holding elements, wherein the inner surfaces of the plurality of sheath holding elements form an inner face and wherein the inner face has teeth.

14. The post-tensioning tendon of claim 4 wherein the outer cap couples to the tubular extension by a coupler

Assignees

• Sorkin Felix

Inventors

• Sorkin Felix

Classifications

• E04C5/10

  Ducts · CPC title

• E04G21/12

  Mounting of reinforcing inserts; Prestressing (shell tubes for prestressing members E04C5/10; anchoring means E04C5/12; connections of reinforcing elements and spacers E04C5/16) · CPC title

• E04C5/122 Primary

  the tensile members are anchored by wedge-action · CPC title