GB2136842A

GB2136842A - Expansion joint sealing structures

Info

Publication number: GB2136842A
Application number: GB08307502A
Authority: GB
Inventors: Delmount Daniel Brown
Original assignee: Brown Co D S; DS Brown Co Inc
Current assignee: Brown Co D S; DS Brown Co Inc
Priority date: 1982-03-30
Filing date: 1983-03-18
Publication date: 1984-09-26
Also published as: SE8301297L; SE8301297D0; FR2542776A1; GB8307502D0; IT1164351B; IT8322353A0; DE3308075A1; BE896156A; CA1178098A; ZA835327B; AU1252683A

Abstract

An expansion joint between pavement sections 12, 13 includes a pair of frames 15, 16 for seating an elastomer sealing strip 10 spanning the joint. Each frame 15, 16 has a rear wall 21 and a front wall of each frame has a downwardly and rearwardly sloping upper segment 23 and a hook-shaped segment 24. Each frame forms a slot between the longitudinal free edge 38 of its lower segment and the facing surface of its upper segment 23 and triangular beads 33 are forced along the slots so that longitudinal lips 34, 35 of each bead seal respectively against the edge and said facing surface of one of the frames 15, 16. <IMAGE>

Description

SPECIFICATION Expansion joint sealing structures There have been many structures proposed for sealing joints in roadway pavements, bridge pavements, and the like. The objective is to prevent water and solid foreign substances from penetrating the space, called a joint, between adjacent sections of concrete pavement-such spaces being provided to accommodate the expansion of the respective concrete pavement sections during warm and hot weather and contraction thereof in cool and cold weather.

Some sealing structures previously used include elastomer extrusions of various external and internal geometric configuration, while others use a combination of metal frames, beams or the like with elastomer members between the frames, beams, etc. to provide the sealing function and at the same accommodating the changes in the joint width as the concrete expands and contracts during climatic temperature changes.

The subject invention constitutes improvements in joint sealing structures commonly referred to as expansion dams or expansion joint seals. The sealing structures utilize a pair of elongated rolled steel frames respectively extending along opposite sides of the joint.

Preferably, they are substantially flush with the surface of the pavement and do not protrude in the vertical plane beyond the opposed faces of the spaced concrete sections at the joint.

The rolled steel frames are rolled steel strips of ordinary or stainless steel. The top, rear and bottom walls are substantially flat (planar); the corners preferably are rounded. The fourth wall or face is situated on the joint side and has an upper portion and a lower portion forming a longitudinal slot in which the longitudinal edges of an elastomer sealing strip are interlocked.

The upper portion preferably is a rearwardly, diagonally sloping wall which extends toward but stops short of the rear wall. The lower portion may be a curved wall or may have a short straight wall segment parallel with the rear wall and a sharp bend to provide a terminal, diagonal edge segment which is substantially parallel with the diagonal upper portion.

In either case, the longitudinal opening or the short passage forming the opening forms a pair of spaced, longitudinal shoulders used to interlock the longitudinal lips of the elastomer sealing strip in the respective frames.

The sealing strip is an elongated extrusion of weather-resistant synthetic rubber, prefera biy neoprene. In cross-section, it has a Vshape which becomes a deeper or shallower V as the joint narrows or widens under temperature changes. Its respective longitudinal edges comprise a strip forming a neck which is preferably slightly the same width as or wider than the width of the slot in the frames. At the outer end of each neck is a bead of triangular transverse cross section. The neck is attached to the mid-portion of one of the sides of the triangle, thereby forming lips or shoulders which lock the triangular bead inside the rolled steel frame after the bead has been forced through the above-described opening in each frame.

rn another form, the metal frames are metal extrusions, preferably of ordinary or stainless steel. The top, rear and bottom walls are substantially flat (planar); the corner preferably are rounded. The fourth front wall or face is situated on the joint side and has an upper portion and a lower portion forming a longitudinal slot in which the longitudinal edges of an elastomer sealing strip are interlocked.

The upper portion is solid metal with a rearwardly, diagonally sloping front wall which extends toward but stops short of the rear wall of the frame. The lower portion is also solid metal and has a curved front wall or a short straight front wall segment parallel with the rear wall an upper, sharp bend between it and an upper, diagonal edge segment which is substantially parallel with the diagonal front wall of the upper portion.

In either case, the longitudinal opening or the short passage between the diagonal front wall and diagonal edge segment and forming the longitudinal slot has a pair of spaced, longitudinal shoulders used to interlock the longitudinal lips of the elastomer sealing strip in the respective frames.

DESCRIPTION OF THE PREFERRED EMBODI MENTAND DRAWINGS Preferred embodiments of the invention are illustrated in the drawings, wherein: IN THE DRAWINGS Figure 1 is a cross-section view of two pavement sections with a joint therebetween, the latter being sealed by a first embodiment of an expansion dam of the invention; Figure 2 is a section view similar to Fig. 1, with a different structure for mounting each frame in the pavement, and Figure 3 is a cross-section view of two pavement sections with a cast-in retainer strip seal.

Referring to the drawings, the expansion dam 10 of Fig. 1 seals the space or joint 11 provided between adjacent pavement sections 1 2 and 1 3 and having a width sufficient to allow the pavement sections to expand without coming into abutting contact. The expansion dam is composed of an elongated first retainer section or frame 1 5 on one side of the joint and a second elongated retainer section or frame 1 6 on the other side of the joint. An elongated neoprene elastomer strip 1 7 spans the joint and seals it against intrusion by water, dirt, stones and other foreign substances.

The respective steel sections or frames are shaped into the cross-sections shown by known steel-rolling techniques. Each section has a top wall 20, rear wall 21, bottom wall 22, a transversely curved, hook-shaped lower segment 24 in the front wall and a downwardly and rearwardly sloping upper segment of the front wall.

The upper and lower segments are separated in a manner forming an elongated, longitudinal slot into which the respective longitudinal edges of the elastomer strip are inserted and locked. The elastomer strip 17 comprises a center, V-section 30 which becomes deeper or shallower as the joint narrows or widens. The v-section is connected by respective narrow strips 31 to respective necks 32. An elongated bead of triangular cross-section is connected at the mid-portion of one of its sides to the neck. One or more longitudinal passages 38 and 39 may be provided in the triangular bead portion to increase the deformability thereof.

The neck 32 has a width substantially the same as the distance between the longitudinal edge 38 of the transversely curved lower portion 24 and the surface of the sloping upper segment 23. The triangular bead 33 is sufficiently deformable so that it can be forced through the elongated slot-the passages 38 and 39 aiding the deformability as the bead 33 is forced through the slot.

The beads 33 in seated position in the slots are shown in Fig. 1. The longitudinal lips 34 and 35 on each side of the neck 32 seal against the edge of the upper segment 23 and the inside surface of the transversely curved lower portion 35 to lock the longitudinal edges of the elastomer sealing strip 1 7 in the sections or frames 1 5 and 1 6.

The latter may be mounted in the pavement sections by any suitable means, e.g., by using at spaced intervals, loop anchor bars 40 and 41 embedded in the pavement and in turn welded to vertical plates 43 and 44. The latter in turn are fixedly connected to the frames or sections 1 5 and 16. The plates optionally may have holes 45 and 46 adapted to receive steel anchor bars used in the overall joint assembly.

The embodiment of Fig. 2 is similar to that of Fig. 1. Where applicable, like numerals designate like parts. Whereas the top walls 20 of the frames or sections 1 5 and 1 6 are flush with the pavemnt surface, the top walls 20 in Fig. 2 are recessed slightly below the pavement surface 1 2a and 13a. Further, the frames or sections 1 5 and 1 6 are mounted in place by attachment thereof at longitudinal intervals to vertical plates 50 and 51. The latter are each welded to a loop anchor. Each loop anchor 52, 53, in turn is supported by steel bars 55-62.

The embodiment of Fig. 3 is a cast-in retainer strip seal in which the joint 72 between pavement sections 70 and 71 is sealed by a similar elastomer strip I7a having a medial V-section 18. The latter is recessed well below the upper surface of the pavement sections. The strip-gripping elongated pavement frames or sections 73 and 74 have a top wall 75, a rear wall 76, a bottom wall 77, and a front wall. The front wall has two segments 3 lower segment 78 terminating with a downwardly and rearwardly sloping lip 79, and a downwardly and rearwardly sloping upper segment 80 of the front wall. The frames or sections 73 and 74 are held in place in the pavement with the front wall being substantially flush with the respective face 82 and 83 by anchors 81.

The elastomer seal is mounted in the frames or sections 73, 74, by forcing each deformable triangular bead 33 through its continuous longitudinal slot formed between the segment 80 and the lip 79. The lips 34 and 35 lock the respective longitudinal edges in place as shown in Fig. 3. Flexible neck portions 1 9 connect the V-segment 18 with necks 32.

Another embodiment of the invention is illustrated in Figs. 4, 5 and 6, wherein: Figure 4 is a cross-section view of two pavement sections with a joint therebetween, the latter being sealed by a first embodiment of an expansion dam of the invention; Figure 5 is a section view similar to Fig. 1 with a different structure for mounting each frame in the pavement; and Figure 6 is a cross-section view of two pavement sections with a cast-in retainer strip seal.

Many of the parts of the joints and dams of Figs. 4-6 are the same as in Figs. 1-3.

Where applicable, like parts in Figs. 4-6 have the- same reference numeral as do the parts in Figs. 1-3, supra. The notable difference is in the use of solid, extruded metal, side frames, instead of hollow, rolled steel side frames.

Referring to the drawings, the expansion dam 10 of Fig. 4 seals the space or joint 11 provided between adjacent pavement sections 1 2 and 1 3 and having a width sufficient to allow the pavement sections to expand without coming into abutting contact. The expansion dam is composed of an elongated first retainer section or frame 1 5 on one side of the joint and a second elongated retainer section or frame 1 6 on the other side of the joint. An elongated neoprene elastomer strip 1 7 spans the joint and seals it against intrusion by water, dirt, stones and other foreign substances.

The respective metal frames are shaped into the cross-sections shown by known metal extrusion techniques. Each section has a top wall 20, rear wall 21, bottom wall 22, a solid metal lower segment 24 in the front wall and solid metal upper segment with a downwardly and rearwardly sloping front wall, i.e., segment 23.

The upper and lower segments are separated in a manner forming an elongated, longitudinal slot into which the respective longitudinal edges of the elastomer strip are inserted and locked. The elastomer strip 1 7 comprises a center, V-section 30 which becomes deeper or shallower as the joint narrows or widens. The V-section is connected by respective narrow strips 31 to respective necks 32. An elongated bead 33 of triangular cross-section is connected at the mid-portion of one of its sides to the neck. One or more longitudinal passages 38 and 39 may be provided in the triangular bead portion to increase the deformability thereof.

The neck 32 has a width substantially the same as the distance between the longitudinal lip 35 of the transversely curved front wall 37 of the lower portion 24 and the surface of, the diagonally sloping front wall of the upper segment 23. The triangular bead 33 is sufficiently deformable so that it can be forced through the elongated slot 36, the passages 38 and 39 aiding the deformability as the bead 33 is forced through the slot.

The beads 33 in seated position in the slots are shown in Fig. 4. The longitudinal lips 34 and 35 on each side of the neck 32 seal against the edge of the upper segment 23 and the inside surface of the transversely curved lower portion 35 to lock the longitudinal edges of the elastomer sealing strip 1 7 in the sections or frames 1 5 and 16.

The embodiment of Fig. 5 is similar to that of Fig. 4. Where applicable, like numerals designate like parts. Whereas the top walls 20 of the frames or sections 1 5 and 1 6 are flush with the pavement surface, the top walls 20 in Fig. 5 are recessed slightly below the pavement surfaces 1 2a and 13a. Further, the frames or sections 1 5 and 1 6 are mounted in place by attachment thereof at longitudinal intervals to vertical plates 50 and 51. The latter are each welded to a loop anchor. Each loop anchor 52, 53, in turn, is supported by steel bars 55-62.

The embodiment of Fig. 6 is a cast-in retainer strip seal in which the joint 72 between pavement sections 70 and 71 is sealed by a similar elastomer strip 1 7a having a medial V-section 18. The latter is recessed well below the upper surface of the pavement sections. The strip-gripping elongated frames or sections 73 and 74 have a top wall 75, a rear wall 76, a bottom wall 77, and a front wall. The front wall has two segments: A solid metal lower segment 78 terminating with a downwardly and rearwardly sloping lip 79, and a solid metal upper segment 80 with a rearwardly sloping front wall. The frames or sections 73 and 74 are held in place in the pavement with the front wall being substantially flush with the respective face 82 and 83 by anchors 81.

The elastomer seal 1 7a is mounted in the frames or sections 73, 74, by forcing each deformable triangular bead 33 through its continuous longitudinal slot 84 formed between and below the segment 80 and the lip 79. The lips 34 and 35 lock the respective longitudinal edges in place as shown in Fig.

6. Flexible neck portions 1 9 connect the Vsegment 1 8 with necks 32.

Claims

1. An expansion joint between adjacent pavement sections with an elastomer seal comprising a first frame of rolled steel mounted on and extending along one side of said joint, an opposing second frame of rolled steel mounted on and extending along the other side of said joint, and an elastomer sealing strip spanning the joint and having its respective longitudinal edges sealed in a respective frame, said frames and said elastomer strip being characterized by an elongated strip of steel roll-formed into elongated, integral top, bottom and rear walls and an integral front wall which faces said joint on one frame opposing the front wall, which faces said joint, of said second frame, said front wall of each frame comprising a downwardly and rearwardly sloping upper segment integral with said top wall and an upwardly projecting, lower segment integral with said bottom wall, each segment having a longitudinal edge spaced from the longitudinal edge of the other segment to form a longitudinal slot in each front face, and said elastomer sealing strip having respective, longitudinal, edge members seated in the respective longitudinal slots of said frames.

2. An expansion joint as claimed in claim 1 wherein the central portion of said elastomer seal is a V-shaped segment.

3. An expansion joint as claimed in claim 1, wherein said lower segment of said front wall is a transversely curved, convex segment extending upwardly from said bottom wall with its upper edge below said upper segment to form said longitudinal slot.

4. An expansion joint as claimed in claim 1, wherein said upwardly projecting lower segment of said front wall has a downwardly and rearwardly extending, elongated lip substantially parallel to, below, and spaced from said downwardly and rearwardly sloping up per segment to form the lower edge of said longitudinal slot.

5. An expansion joint as claimed in claim 1, wherein each frame has a top wall substantially flush with the surface of the pavement, and said frames being mounted on their respective pavement section by vertical plates attached at longitudinal intervals to said frames.

6. An expansion joint as claimed in claim 5, wherein each plate has attached thereto an anchor bar which is burried in the pavement.

7. An expansion joint as claimed in claim 1, wherein said longitudinal edge members on said elastomer sealing strips comprise a neck with a distortable bead of substantially triangular transverse cross-section on said neck, and said elastomer strip being mounted on said frames by forcing each distortable triangular bead through its respective longitudinal slot in a respective frame until said beads become interlocked with portions of each front wall along opposite sides of the respective longitudinal slots.

8. An expansion joint as described in the specification.

9. An expansion joint between adjacent pavement sections with an elastomer seal comprising a first frame of extruded metal mounted on and extending along one side of said joint, an opposing second frame of extruded metal mounted on and extending along the other side of said joint, and an elastomer sealing strip spanning the joint and having its respective longitudinal edges seated in a respective frame, said frames and said elastomer strip being characterized by elongated, longitudinal, solid metal, upper and lower segments forming a front wall, which faces said joint, on one frame opposing the front wall, which faces said joint, of said second frame, each front wall having a continuous longitudinal slot between said segments; and the respective longitudinal edges of said elastomer seal having a neck with a longitudinal, distortable bead on said neck, and said elastomer strip being mounted on said frames by forcing each distortable bead through its respective longitudinal slot in a respective frame until said beads become interlocked with longitudinal lips along opposite sides of each slot.

10. An expansion joint as claimed in claim 9i wherein the central portion of said elastomer seal is a V-shaped segment.

11. An expansion joint as claimed in claim 9, wherein the front wall of each frame comprises a transversely curved front wall on said lower segment and a downwardly and rearwardly sloping front wall on said upper segment, and a space between said segments forming said longitudinal slot.

1 2. An expansion joint as claimed in claim 9, wherein the front wall of each frame comprises a vertical, planar, front wall on said lower segment and a downwardly and rearwardly sloping front wall on said upper segment, and a space between said segments forming said longitudinal slot.

1 3. An expansion joint as claimed in claim 9, wherein each frame has a top wall substantially flush with the surface of the pavement, and said frames being mounted on their respective pavement section by vertical plates attached at longitudinal intervals to said frames.

14. An expansion joint as claimed in claim 13, wherein each plate has attached thereto an anchor bar which is buried in the pavement.

1 5. An expansion joint as claimed in claim 9, wherein said longitudinal edge members on said elastomer sealing strips comprise a neck with a distortable bead of substantially triangular transverse cross-section on said neck, and said elastomer strip being mounted on said frames by forcing each distortable triangular bead through its respective longitudinal slot in a respective frame until said beads become interlocked with portions of each front wall along opposite sides of the respective longitudinal slots.

16. An expansion joint substantially as hereinbefore described with reference to Fig.

1, Fig. 2 or Fig. 3 of the accompanying drawings.