Axial reinforcement system for restorative shell
An axial reinforcement system is disclosed that provides a shell (i.e., a form or jacket) that protects a weight-bearing member (e.g., a cement column) from a corrosive environment and which also substantially increases the structural capacity of the weight-bearing member. The shell is integrated with “positioners” and reinforcing elements, the combination of which offers several advantages over conventional shells. The positioner is attached directly to the shell and the positioner is, in turn, secured to a reinforcing element, which can be a reinforced steel, such as rebar, or a carbon fiber reinforced polymer material. The axial reinforcement system has been found to substantially increase the structural rigidity of the weight-bearing member, while at the same time protecting the weight-bearing member from corrosion and is also simple to install.
1. An axial reinforcement system comprising:
a shell having a length and configured to be wrapped around a weight-bearing member, the shell having an outer cylindrical surface and an inner cylindrical surface radially-inward of the outer cylindrical surface, the outer and inner cylindrical surfaces extending the length of the shell;
a positioner having a bottom surface attached, via an adhesive, to the inner cylindrical surface of the shell such that the positioner is located in a void formed between the shell and the weight-bearing member when the shell is wrapped around the weight-bearing member, wherein the bottom surface of the positioner is positioned more radially-inward than the inner cylindrical surface of the shell, and wherein the positioner has at least one hole formed therein, and the positioner is not attached to the weight-bearing member;
a reinforcement member secured to the positioner and serving to reinforce the weight-bearing member,
wherein the positioner comprises an elongate concavity to accommodate the reinforcement member and is structured to position and support the reinforcement member within the void when the shell is wrapped around the weight-bearing member, and
wherein the reinforcement member extends along a longitudinal axis of the shell.
2. The axial reinforcement system of claim 1 , wherein the reinforcement member protrudes out of the concavity formed in the positioner.
3. The axial reinforcement system of claim 2 , wherein an adhesive is located within the concavity of the positioner and which secures the reinforcement member to the positioner.
4. The axial reinforcement system of claim 2 , further comprising a securing element that secures the reinforcement member within the concavity of the positioner.
5. The axial reinforcement system of claim 4 , wherein the securing element is a metal or plastic tie wrapped around the reinforcement element.
6. The axial reinforcement system of claim 1 , wherein the reinforcement member is wrapped around the column and is attached to a plurality of positioners within the shell.
7. The axial reinforcement system of claim 1 , wherein a plurality of positioners is used for each reinforcement member and the plurality of positioners is attached directly to the shell.
8. The axial reinforcement system of claim 1 , wherein the reinforcement member comprises one selected from the group consisting of a metal rebar, a fiber-reinforced rebar, and a carbon fiber laminate.
9. The axial reinforcement system of claim 1 , wherein the positioner is made of an epoxy matrix.
10. The axial reinforcement system of claim 1 , further comprising an epoxy grout placed within the void to secure the shell to the weight-bearing member.
11. The axial reinforcement system of claim 1 , wherein neither the positioner nor the reinforcement member are attached to the weight-bearing member when in an installed position.
12. The axial reinforcement system of claim 1 , wherein the shell is a half-shell and the half-shell not having a seam, the shell being wrapped partially around the weight-bearing member.
13. The axial reinforcement system of claim 1 , wherein the positioner and the reinforcement member are spaced apart from the weight-bearing member so as to avoid contact with the weight-bearing member.
14. The axial reinforcement system of claim 1 , wherein the bottom surface of the positioner is attached to the inner cylindrical surface of the shell with an adhesive.
15. The axial reinforcement system of claim 14 , wherein the bottom surface of the positioner comprises grooves that allow the adhesive to more securely attach the positioner to the inner cylindrical surface of the shell.
16. A method reinforcing a weight-bearing member, comprising:
providing a shell configured to be wrapped around the weight-bearing member, the shell having an outer cylindrical surface and an inner cylindrical surface radially-inward of the outer cylindrical surface;
attaching a bottom of a positioner, via an adhesive, to the inner cylindrical surface of the shell such that the positioner is located in a void formed between the shell and the weight-bearing member when the shell is wrapped around the weight-bearing member, wherein a bottom surface of the positioner is attached to the inner cylindrical surface of the shell with an adhesive and/or a mechanical fastener, and after such attaching the bottom surface of the positioner is more radially-inward than the inner surface of the shell, and wherein the positioner has at least one hole formed therein, and the positioner is not attached to the weight-bearing member; and
securing a reinforcement member to the positioner, the reinforcement member extending along a longitudinal axis of the shell and serving to reinforce the weight-bearing member,
wherein the positioner comprises an elongated concavity to accommodate the reinforcement member and is structured to position and support the reinforcement member within the void when the shell is wrapped around the weight-bearing member.
17. The method of claim 16 , wherein the reinforcement member protrudes out of the concavity formed in the positioner.
18. The method of claim 17 , wherein a plurality of positioners is used for each reinforcement member and the plurality of positioners is attached directly to the shell and not attached to the weight-bearing member.
19. An axial reinforcement system comprising:
a shell configured to be wrapped around a weight-bearing member, the shell having a seam where two ends of the shell meet, the seam running vertically in a direction of a longitudinal axis of the shell, the shell having an outer surface and an inner surface radially-inward of the outer surface;
a positioner having a bottom surface attached, via an adhesive, directly to the inner surface of the shell such that the positioner is located in a void formed between the shell and the weight-bearing member when the shell is wrapped around the weight-bearing member, wherein the bottom surface of the positioner is positioned more radially-inward than the inner surface of the shell, and the positioner has at least one hole formed therein, and the positioner is not attached to the weight-bearing member;
a reinforcement member secured to the positioner and serving to reinforce the weight-bearing member,
wherein the positioner comprises a concavity to accommodate the reinforcement member and is structured to position and support the reinforcement member within the void when the shell is wrapped around the weight-bearing member,
wherein the positioner and reinforcement member are spaced apart from the weight-bearing member, and
wherein the reinforcement member extends along a longitudinal axis of the shell.
20. The axial reinforcement system of claim 19 , wherein two ends of the shell that meet at the seam are secured together with a tongue-and-groove structure or a bolted connection.