Pole shield
The present disclosure relates to a pole shield for extending around a pole structure. The pole shield comprises one or more than one sheet of composite material forming a hollow structure having an open first end and an opposed open second end. The sheet or sheets of composite material comprise from about 50% to about 80% by weight of a reinforcement impregnated with about 20% to about 50% of a polyurethane resin composition comprising a combination of a polyol component and a polyisocyanate component. Two or more pole shields may be stacked one on top of the other to form a pole shield structure which extends the height of protection of the pole structure. The pole shield can be used for protecting a pole structure from damage, such as from fire, rain, wind, sand, ice, pests, moisture or electrical. The pole shield may also be used to provide structural support to a pole structure.
1. A system comprising:
(a) a pole structure; and
(b) a pole shield provided on the pole structure for protecting the pole structure from fire, wherein the pole shield comprises:
at least one sheet of composite material forming a hollow structure having an open first end and an opposed open second end circumferentially extending around the pole structure, the at least one sheet of composite material comprising from about 50% to about 80% by weight of a reinforcement impregnated with about 20% to about 50% of a polyurethane resin composition comprising a combination of a polyol component and a polyisocyanate component, wherein the at least one sheet of composite material is from about 0.2 mm to about 20.0 mm thick and has fire resistant properties.
2. The system of claim 1 , wherein the reinforcement is glass.
3. The system of claim 1 , wherein the polyol component comprises a plurality of OH groups that are reactive towards the polyisocyanate component, and wherein the polyisocyanate component comprises a plurality of NCO groups that are reactive towards the polyol component.
4. The system of claim 3 , wherein the OH:NCO mixing ratio, by volume, of the polyurethane resin composition is from about 1.0:5.0 to about 5.0:1.0.
5. The system of claim 1 , wherein the polyol component comprises a polyether polyol, a polyester polyol, or a mixture thereof.
6. The system of claim 1 , wherein the polyisocyanate component comprises a greater amount of an aliphatic isocyanate than an aromatic isocyanate.
7. The system of claim 1 , wherein the pole shield is a first pole shield, wherein the system further comprises a second pole shield provided on the pole structure, wherein the second pole shield comprises at least one sheet of composite material forming a hollow structure having an open first end and an opposed open second end circumferentially extending around the pole structure, and wherein the first and second pole shields are stacked one on top of the other with the open first end of one of the pole shields connecting to the open second end of the other one of the pole shields to increase a combined height of the pole shields extending around the pole structure.
8. The system of claim 1 , wherein the pole structure is installed in the ground.
9. The system of claim 8 , wherein the pole shield rests on the ground surface.
10. The system of claim 8 , wherein a portion of the pole shield is below the ground surface.
11. A pole structure comprising:
an elongated pole structure having an upper portion and a lower portion, the lower portion being positioned on a ground surface, and
a pole shied surrounding the lower portion of the pole structure, the pole shield comprising one or more than one sheet of composite material forming a hollow structure having an open first end and an opposed open second end for circumferentially fitting around a pole structure, the one or more than one sheet of composite material comprising from about 50% to about 80% by weight of a reinforcement impregnated with about 20% to about 50% of a polyurethane resin composition comprising a combination of a polyol component and a polyisocyanate component, wherein the pole shield has fire resistant properties.
12. The pole structure of claim 11 , wherein the polyisocyanate component in each pole shield sheet comprises a greater amount of an aliphatic isocyanate than an aromatic isocyanate.
13. A method of protecting a pole structure, comprising:
providing an elongated pole structure having an upper portion and a lower portion, the lower portion being proximate to a ground surface; and
enveloping at least a section of the pole structure with a pole shield, the pole shield comprising one or more than one sheet of composite material forming a hollow structure having an open first end and an opposed open second end for circumferentially fitting around a pole structure, the one or more than one sheet of composite material comprising from about 50% to about 80% by weight of a reinforcement impregnated with about 20% to about 50% of a polyurethane resin composition comprising a combination of a polyol component and a polyisocyanate component, wherein the pole shield has fire resistant properties.
14. The method of claim 13 , wherein the polyisocyanate component in each pole shield sheet comprises a greater amount of an aliphatic isocyanate than an aromatic isocyanate.
15. The method of claim 13 , comprising the step of enveloping the lower portion of the pole structure with a second pole shield, wherein the second pole shield envelopes at least a portion of the first pole shield.
16. The method of claim 13 , wherein the pole shield rests on the ground surface.
17. The method of claim 13 , wherein the pole structure is installed in the ground, having an underground portion, lower portion, and upper portion.
18. The method of claim 13 , wherein the one or more than one sheet of composite material is from about 0.2 mm to about 20.0 mm thick.
19. The method of claim 13 , wherein, after providing the pole structure, the method further comprises installing the pole structure in or on the ground, and wherein the encircling the at least a section of the pole structure with the pole shield comprises encircling the at least a section of the pole structure with the pole shield at the same time as installing the pole structure in or on the ground.
20. The method of claim 13 , wherein, after providing the pole structure, the method further comprises installing the pole structure in or on the ground, and wherein the encircling the at least a section of the pole structure with the pole shield comprises encircling the lower portion of the pole structure with the pole shield after installing the pole structure in or on the ground.