Concrete anchor and cover for same
A method for forming a concrete anchor may comprise the steps of providing an anchor body, at least partially encapsulating the anchor body in a sealing cover, providing at least one tubular member, engaging an end surface of the tubular member against a surface of the sealing cover so as to weld the member to the sealing cover.
1. An anchor for use in post-tensioned concrete, comprising:
an anchor body including a bore extending along an axis of the body; and
a sealing cover including a first portion and a second portion, wherein the first portion at least partially encapsulates the body, wherein the second portion includes an elongated tube having first and second ends and is welded to the first portion at one of the first and second ends;
wherein one of the first and second portions includes an end surface and a plurality of annular protrusions extending from the end surface and wherein an other of the first and second portions includes at least one annular mating protrusion configured to engage the plurality of protrusions.
2. The anchor according to claim 1 wherein the cover is formed of plastic.
3. The anchor according to claim 1 wherein the second portion is welded to the first portion by spin-welding.
4. The anchor according to claim 1 wherein the second portion is welded to the first portion by ultrasonic welding.
5. The anchor according to claim 1 wherein the plurality of protrusions includes a first protrusion, a second protrusion positioned radially outwardly from the first protrusion, and a third protrusion positioned radially outwardly from the second protrusion.
6. The anchor according to claim 5 wherein the at least one mating protrusion includes a first mating protrusion positioned between the first protrusion and the second protrusion, and a second mating protrusion positioned between the second protrusion and the third protrusion.
7. The anchor according to claim 5 wherein the second protrusion has at least one of a larger axial height and a larger radial thickness relative to the first protrusion and the third protrusion.
8. The anchor according to claim 5 wherein at least one of a space between the first protrusion and the second protrusion and a space between the second protrusion and the third protrusion defines a pocket to control material flow during spin-welding.
9. A method of forming the anchor of claim 1 comprises the steps of:
a) providing the anchor body;
b) at least partially encapsulating the anchor body in the sealing cover;
c) providing at least one tubular member;
d) securing one of the encapsulated anchor body and the tubular member against movement; rotating the other of the encapsulated anchor body and the tubular member; and
e) engaging an end surface of the tubular member against a surface of the sealing cover so as to weld the tubular member to the sealing cover.
10. The method of claim 9 wherein step c) includes providing at least two tubular members having different dimensions and selecting one of the provided tubular members.
11. The method of claim 10 wherein the at least two tubular members have different lengths.
12. The method of claim 9 wherein step e) includes moving the protrusions on the end surface to engage the mating protrusions on the surface of the sealing cover.
13. The method of claim 12 wherein moving the protrusions forms radial pockets to receive a flow of welded material.
14. A method of forming the anchor of claim 1 comprises the steps of:
a) providing the anchor body;
b) at least partially encapsulating the anchor body in the sealing cover;
c) providing at least one tubular member;
d) positioning the tubular member adjacent a surface of the sealing cover; and
e) vibrating the tubular member at a high frequency against the surface of the sealing cover so as to melt a portion of the tubular member and a respective said portion of the sealing cover so as to join the tubular member and the sealing cover.
15. The method of claim 14 wherein step c) includes providing at least two tubular members having different dimensions and selecting one of the provided tubular members.
16. The method of claim 14 wherein the at least two tubular members have different lengths.
17. The method of claim 14 wherein step e) includes positioning a sonotrode against a portion of the member to transmit vibrational energy to the member.
18. The method of claim 14 wherein vibrating the tubular member causes the melted portions of the tubular member and the sealing cover to flow into pockets formed between an end of the tubular member and the surface of the sealing cover.