Lateral seismic brace
A sway brace fitting clamp is used for lateral bracing of sprinkler or other types of pipe (designated the service pipe) to a structure, to prevent movement of the service pipe perpendicular to the axis of the pipe relative to the structure to which it is attached. The sway brace fitting clamp includes a U-bolt which fits around the service pipe, and a pair of hooks that are coupled to straight ends of the U-bolt, for hooking the sway brace pipe. A pair of nuts engages threaded portions of the U-bolt ends. The nuts may be tightened to pull the sway brace pipe into contact with the service pipe, firmly clamping the sway brace pipe and the service pipe together.
1. A method of seismic bracing, the method comprising:
placing a round sway brace substantially perpendicular to a service pipe;
after the placing, engaging the round sway brace and the service pipe with a sway brace fitting clamp, wherein the engaging does not require movement of either the service pipe or the round sway brace; and
tightening the sway brace fitting clamp to couple together the round sway brace and the service pipe;
wherein the engaging includes:
placing a U-shape bolt of the clamp around the service pipe; and
placing a pair of hooks of the clamp around the round sway brace;
wherein the hooks are coupled to legs of the U-shape bolt before and during the placing the bolt and the placing the hooks;
wherein at least one of the engaging and the tightening includes having a central curved body of the U-shape bolt contact the service pipe;
wherein the tightening includes moving the hooks toward the service pipe by tuning nuts of the clamp that are on threaded portions of the legs of the U-shape bolt;
wherein the round sway brace is a sway brace pipe; and
wherein the moving causes sharp tips of the legs to penetrate the sway brace pipe.
2. A method of seismic bracing, the method comprising:
placing a round sway brace substantially perpendicular to a service pipe;
after the placing, engaging the round sway brace and the service pipe with a sway brace fitting clamp, wherein the engaging does not require movement of either the service pipe or the round sway brace; and
tightening the sway brace fitting clamp to couple together the round sway brace and the service pipe;
wherein the tightening includes providing a force pulling the sway brace and the pipe together.
3. The method of claim 2 ,
wherein the engaging includes:
placing a U-shape bolt of the clamp around the service pipe; and
placing a pair of hooks of the clamp around the round sway brace; and
wherein the hooks are coupled to legs of the U-shape bolt before and during the placing the bolt and the placing the hooks; and
wherein at least one of the engaging and the tightening includes having a central curved body of the U-shape bolt contact the service pipe.
4. The method of claim 3 , wherein the tightening includes moving the hooks toward the service pipe by tuning nuts of the clamp that are on threaded portions of the legs of the U-shape bolt.
5. The method of claim 4 , wherein the moving causes teeth of the hooks to press against the round sway brace.
6. The method of claim 4 ,
wherein the nuts are shear nuts; and
wherein the tightening continues until heads of the nuts have been sheared off.
7. A sway brace fitting clamp for coupling a round sway brace to an object, the clamp comprising:
a U-shape bolt having a central curved body and a pair of threaded ends emanating from the central body;
a pair of hooks coupled to respective of the ends; and
nuts threaded onto the threaded ends, wherein the nuts can be rotated to bear against the hooks to move the hooks toward the curved body;
whereby, in an installed position, the U-shape bolt and the hooks are positioned by adjusting the nuts, to secure the clamp, with each of the hooks providing a distributed contact along a circumferential line of the sway brace, with the contact over multiple points or an area.
8. The clamp of claim 7 , wherein the nuts are shear nuts having heads configured to separated from threaded parts of the shear nuts at a predetermined torque.
9. The clamp of claim 7 , wherein the nuts are rivet-nuts that are swaged to retain the nuts partially within the hooks.
10. The clamp of claim 7 ,
wherein the hooks have a U shape, with each of the hooks having a central body and a pair of sides; and
wherein the sides of each of the hooks defines an opening therein for receiving the round sway brace.
11. The clamp of claim 10 , wherein the threaded ends of the U-shape bolts pass through holes in the central bodies of the hooks.
12. The clamp of claim 10 , wherein the central bodies of the hooks wrap around the threaded ends.
13. The clamp of claim 10 , wherein for each of the hooks the sides are diametrically opposed on opposite sides of one of the threaded ends.
14. The clamp of claim 10 , wherein the sides of the hooks each have a V-shape root for receiving the round sway brace.
15. The clamp of claim 14 , wherein the sides of the hooks have teeth facing inward toward the openings.
16. The clamp of claim 10 , wherein the hooks are stamped sheet metal hooks.
17. The clamp of claim 7 , wherein the threaded ends of the U-shape bolt are parts of legs of the bolt; and
wherein the legs each have pairs of bends in them.
18. The clamp of claim 17 , wherein the pairs of the bends separate the threaded ends farther apart than parts of the legs on the other side of the bends.
19. The sway brace fitting clamp of claim 7 , wherein at least part of the nuts are outside of the hooks.
20. The sway brace fitting clamp of claim 19 , wherein the at least part of the nuts is below the hooks, between the hooks and the central curved body of the U-shape bolt.
21. The sway brace fitting clamp of claim 8 , in combination with the round sway brace.
22. The combination of claim 21 , further in combination with the service pipe.
23. The combination of claim 21 , wherein the round sway brace is a sway brace pipe.
24. A sway brace fitting clamp for coupling a round sway brace to an object, the clamp comprising:
a U-shape bolt having a central curved body and a pair of threaded ends emanating from the central body;
a pair of hooks coupled to respective of the ends; and
nuts threaded onto the threaded ends, wherein the nuts can be rotated to bear against the hooks to move the hooks toward the curved body;
wherein the threaded ends of the U-shape bolt are parts of legs of the bolt;
wherein the round sway brace is a sway brace pipe; and
wherein the legs have sharp tips for pressing against the sway brace pipe when the sway brace pipe is within pipe-receiving openings defined by the hooks;
whereby, in an installed position, the U-shape bolt and the hooks are positioned by adjusting the nuts, to secure the clamp.
25. A sway brace fitting clamp for coupling a round sway brace to an object, the clamp comprising:
a U-shape bolt having a central curved body and a pair of threaded ends emanating from the central body;
a pair of hooks coupled to respective of the ends; and
nuts threaded onto the threaded ends, wherein the nuts can be rotated to bear against the hooks to move the hooks toward the curved body;
wherein at least part of the nuts are outside of the hooks; and
wherein the at least part of the nuts is above the hooks, with the hooks between the at least part of the nuts and the central curved body of the U-shape bolt;
whereby, in an installed position, the U-shape bolt and the hooks are positioned by adjusting the nuts, to secure the clamp.