Expansion joint system for accommodation of large movement in multiple directions
View Patent ↗An expansion joint system which is provided to accommodate forces applied to highway construction during normal changes in ambient conditions, and which is also designed to withstand seismic forces and vehicular forces, which may be applied in transverse and longitudinal directions. The system includes spaced-apart transverse vehicle load bearing members which are placed in a gap defined between adjacent sections of highway construction, longitudinally extending support members positioned beneath the load bearing members, means embedded within the adjacent roadway sections that control longitudinal, transverse and vertical movement, and a mechanism for controlling the spacing between the transverse load bearing beams. Preferably, this mechanism maintains a substantially equal distance between the transverse load bearing beam members.
1. An expansion joint system for roadway construction wherein a gap is defined between adjacent first and second roadway sections, said expansion joint system extending across said gap to permit vehicular traffic, said expansion joint system comprising:
transversely extending, spaced-apart, vehicular load bearing members;
elongated support members having opposite ends positioned below said transversely extending load bearing members and extending longitudinally across said gap; and
means for controlling the spacing of said vehicle load bearing members relative to one another comprising pivoting arms that are slidably engaged with at least one of said vehicle load bearing members, wherein said pivoting arms are adapted to slide along an elongated guide engaged with said vehicle load bearing members.
2. The expansion joint system of claim 1 , comprising elongated support members longitudinally extending across said expansion joint from said first roadway section to said second roadway section.
3. The expansion joint system of claim 1 , wherein said system comprises at least one first means for accepting an end of said at least one elongated support member extending longitudinally across said gap, wherein said first means for accepting includes means for substantially restricting transverse movement within said at least one first means for accepting, but permitting longitudinal and vertical movement within said first means for accepting; and
at least one second means for accepting an end of said at least one elongated support member extending longitudinally across said gap, wherein said second means for accepting include means for substantially restricting longitudinal movement within said second means for accepting, but permitting transverse and vertical movement within said second means for accepting, wherein said at least one elongated support member has one end located within said first means for accepting and the opposite end located in said second means for accepting.
4. The expansion joint system of claim 3 , wherein said first and second means for accepting the ends of said elongated support members extending longitudinally across said gap are structures selected from the group consisting of boxes, receptacles, chambers, housings, containers, enclosures, channels, tracks, slots, grooves or passages.
5. The expansion joint system of claim 1 , wherein said means for controlling the spacing between said transversely extending load bearing members comprises arms pivotably attached to said at least one load bearing member by bolts.
6. The expansion joint system of claim 5 , wherein said means for controlling the spacing between said transversely extending load bearing members comprises two pivotably attached arms.
7. The expansion joint system of claim 6 , wherein said arms are pivotably attached to at least one of said transversely extending load bearing members at a fixed pivot point.
8. The expansion joint system of claim 7 , wherein rollers are attached to said arms of means for controlling the spacing of said transversely extending load bearing members.
9. The expansion joint system of claim 8 , wherein said rollers are cylindrically shaped.
10. The expansion joint system of claim 9 , wherein said cylindrically shaped rollers further comprise a low friction surface.
11. The expansion joint system of claim 10 , wherein said low friction surface comprises a urethane sleeve disposed over said rollers.
12. The expansion joint system of claim 1 , further comprising means for movably engaging said longitudinally extending, elongated support members with said transversely extending, spaced-apart load bearing members.
13. The expansion joint system of claim 12 , wherein said means comprises a yoke assembly.
14. The expansion joint system of claim 13 , wherein said yoke assembly comprises spaced-apart yoke side plates and a bent yoke plate spanning the gap between said spaced-apart yoke side plates.
15. The expansion joint system of claim 14 , wherein said yoke assembly slidably engages said longitudinally extending, elongated support members with said transversely extending, spaced-apart load bearing members.
16. The expansion joint system of claim 13 , wherein said yoke assembly comprises bearings to permit longitudinal and vertical movement of said longitudinally extending, elongated support members.
17. The expansion joint system of claim 1 , further comprising seals extending between at least two of said load bearing members.
18. The expansion joint system of claim 1 , further comprising seals extending between at least two of said load bearing members, and between said load bearing members and edge sections of said first and said second roadway sections.
19. The expansion joint system of claim 18 , wherein said seals are flexible and compressible.
20. The expansion joint system of claim 19 , wherein said seals comprise an elastomeric material.
21. The expansion joint system of claim 20 , wherein said seals are selected from strip seals, glandular seals, and membrane seals.