US3900271A - Joint forming seal assembly - Google Patents

Joint forming seal assembly Download PDF

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Publication number
US3900271A
US3900271A US409426A US40942673A US3900271A US 3900271 A US3900271 A US 3900271A US 409426 A US409426 A US 409426A US 40942673 A US40942673 A US 40942673A US 3900271 A US3900271 A US 3900271A
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United States
Prior art keywords
portions
seal assembly
sealing member
joint
forming seal
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US409426A
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English (en)
Inventor
Alfred F Crone
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Acme Highway Products Corp
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Acme Highway Products Corp
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Publication date
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Priority to US409426A priority Critical patent/US3900271A/en
Priority to CA208,599A priority patent/CA1029230A/fr
Application granted granted Critical
Publication of US3900271A publication Critical patent/US3900271A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
    • E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
    • E01C11/12—Packing of metal and plastic or elastic materials
    • E01C11/126—Joints with only metal and prefabricated packing or filling

Definitions

  • the center plates are embedded in the pavement and extend transversely of the length thereof to induce planes of weaknesses in the pavement in order to control the location of cracks initially caused by the contraction of the pavement as it hardens and thereafter by internal stresses generated in the pavement as a result of temperature variations.
  • contraction grooves are formed above these plates by sawing through the hardened top surface of the pavement to a predetermined depth.
  • an elastic sealing strip is inserted within the groove to prevent liquids and solid materials from passing into the grooves.
  • the groove must be thoroughly cleaned to remove debris and all the pavement particles accumulated in the groove as a result of the sawing operation prior to the insertion of the seal.
  • the adhesive when used, must be applied to the opposed faces of the adjacent pavement sections defining the groove prior to positioning the seal in place.
  • the saw cutting, groove cleaning and adhesive applying operations are time consuming and expensive.
  • the saw cut may be offset or misaligned relative to the center plate thereby causing cracks produced by the groove to migrate away from the desired plane of weakness.
  • the sealing strips employed in the grooves often are provided with an internal structure including cross bars and ribs which are relied upon to provide the necessary pressure sealing against the groove side walls under seal expansion. Sometimes a mechanical interlock is provided between the seal side walls and the groove side walls to provide the same function.
  • the joint forming seal assembly of this invention is characterized by the provision of a pair of center plates each rigidly attached to a joint support member for movement therewith during pavement contraction and expansion.
  • the upper ends of the center plates are spaced from each other and receive the side portions of a sealing member adhesively secured thereto.
  • This assembly is positioned in place prior to the pavement pouring operation to form a contraction joint in the subsequently formed pavement in vertical alignment above the plane of weakness induced by the center plates.
  • Relative movement of the center plates away from each other during pavement contraction causes the sealing member to expand maintaining the sealing member side portions in sealing engagement against the opposed faces of the adjacent pavement sections at all times.
  • FIG. 1 is a fragmentary side elevational view of a portion of a joint forming seal assembly of this invention
  • FIG. 2 is a vertical sectional view, on an enlarged scale, taken about on line 22 of FIG. 1;
  • FIG. 3 is a cross sectional view taken about on line 3-3 of FIG. 2;
  • FIG. 4 is a fragmentary side elevational view of a portion of one of the joint forming center plates incorpo' rated in this invention
  • FIG. 5 is a fragmentary vertical sectional view of another form of a joint forming seal assembly of this invention, showing the assembly in its initially installed condition with the sealing member at maximum compression; and I FIG. 6 is a view similar to FIG. 5, showning the joint forming seal assembly in an expanded condition.
  • each joint support 12 comprises a pair of members 14 and 16 adapted to be embedded in adjacent pavement sections 18 and 20 and having curved legs 22 and 24 provided at their lower ends with any suitable means for resting on the subgrade, such as projections 26 (FIG.
  • joint forming seal assembly 10 comprises a pair of opposed center plates 36 and 38 extending lengthwise of the groove to be formed and rigidly secured at longitudinally spaced in tervals to joint support members 14 and 16, respectively. Since both plates 36 and 38 are identical in construction, it is believed that a detailed description of only one plate 36 will suffice, it being understood that the same reference characters are used to identify similar parts.
  • Center plate 36 comprises a strip of material, preferably formed of sheet steel, having a straight, vertically extending lower plate portion 40, an outwardly inclined web portion 42, and a straight upper plate portion 44 laterially offset from lower portion but in substantial parallelism therewith.
  • the lower plate portion 40 of center plate 36 is provided at spaced intervals with a generally rectangularly shaped slot or opening 46 (FIG. 4) adapted to receive socket 30 of joint support member 14.
  • Fingers or tabs 48 are struck out from lower plate portion 40 at the corners of opening 46 and are bent laterally outwardly to extend in a direction generally normal to lower portion 40 as shown in dashed outline in FIG. 2.
  • exten sion 28 of member 14 passes through the aligned openings 46 in plates 36 and 38 into socket 30 ofjoint member 16. Abutment shoulders 33 and 35 are engaged against the outer faces of center plate tabs 50 and 52 of plates 36 and 38 and the opposed inner faces of plate portions 40 abut each other.
  • the upper plate portions 44 of plates 36 and 38 are spaced from each other for mounting a sealing member, generally designated 56, thereon, such sealing member being at maximum compression when installed, as shown in FIG. 2.
  • One or more shear rivets 58 secures portions 40 of plates 36 and 38 together and is adapted to be ruptured at a predetermined force exerted by pavement contraction urging at least one of the pavement sections away from the other causing relative movement between joint members 14 and I6 and center plates 36 and 38 therewith.
  • Sealing member 56 preferably is composed of a resiliently yieldable elastomeric material, such as neoprene for example, or any other suitable elastic material having similar properties of durability, sufficient compression and expansion capabilities, high abrasion resistance and capable of withstanding temperature extremes, sunlight, weathering, oxidation and deleterious chemicals.
  • Sealing member 56 is formed of a unitary, one-piece construction by a suitable extrusion process and can be of any length desired. Sealing member 56 can take various outside dimensions to conform to the widths of the grooves in which it is used and can be of any length to accommodate varying widths of pavemerits.
  • sealing member 56 comprises a pair of vertically extending side walls 60 and 62, a recessed top wall 64, and a recessed bottom wall 66 of an inverted Vshaped configuration.
  • Top wall 64 comprises a pair of side sections 68 and 70 of substantial thickness to increase the resistance to wear caused by vehicular traffic passing thereover and an intermediate Vshaped section or cross bar 72 in the form of a chevron and comprising angularly related portions extending from the inner lower ends of side sections 68 and 70 and converging downwardly to form a downwardly directed knee 73.
  • the U-shaped configuration of cross bar 72 influences downward movement of knee 73 as the straight portions of cross bar 72 move relatively toward each other during seal compression.
  • Side walls 60 and 62 are provided with rounded projections or ribs 74 and 76 formed integral with the outer faces of side walls 60 and 62 and extending lengthwise thereof to provide a mechanical interlock preventing vertical shifting of sealing member side walls 60 and 62 relative to the opposed faces of pavement sections 18 and 20.
  • a pair of inner walls 78 and 80 extend downwardly from top wall side sections 68 and 70 in substantial parallelism with side walls 60 and 62 and are laterally spaced inwardly relative thereto defining grooves for the reception of the upstanding upper portions 44 of center plates 36 and 38, respectively.
  • the upper ends of inner walls 78 and 80 are connected to the opposite ends of cross bar 72 by means of the thickened side sec tions 68 and 70.
  • the lower ends of inner walls 78 and 80 project below the ends of side walls 60 and 62 and are formed integral with the opposite ends of bottom wall 66.
  • the opposed faces of walls 60, 78 and 62, 80 are adhesively secured to the opposite sides of center plate upper portions 44 by means of a suitable adhesive which cements sealing member 56 in place on center plates 36 and 38.
  • a significant feature of this invention is that the entire joint forming seal assembly 10 is assembled and installed as a unit in place on the subgrade prior to the concrete pouring operationv
  • Center plates 36 and 38 are fixedly secured to their respective joint members 14 and 16 by means of tabs 48 for movement therewith.
  • the lower portions 40 of plates 36 and 38 are fastened together in an abutting relation by shear rivets 58 and the side portions of sealing member 56 which are comprised of walls 60, 78 and 62, 80 are adhesively secured to the upper portions 44 of plates 36 and 38 in the manner shown in FIG. 2. In this initially installed condition, sealing member 56 is at maximum compression.
  • pavement sections 18 and 20 will contract and generate pressures urging center plates 36 and 38 apart.
  • shear rivets 58 will rupture, allowing plates 36 and 38 to be moved apart along with their associated joint members 14 and 16 to expand sealing member 56.
  • sealing member 56 Upon complete curing, sealing member 56 will be in a normally compressed condition somewhat relaxed or expanded from the condition shown in FIG. 2, and will thereafter expand and contract as pavement sections 18 and 20 contract and expand due to temperature variations.
  • Center plates 36 and 38 provide the plane of weakness to control the areas of crack formations in the pavement and the upper portions 44 thereof together with sealing member 56 form the contraction groove directly above such plane of weakness to accommodate contraction and expansion of the pavement.
  • the mechanical seal formed between the sealing member side walls 60 and 62 and the opposed faces of pavement sections 18 and 20 during the pavement hardening stage maintains side walls 60 and 62 in sealing engagement with pavement sections 18 and 20 at all times during pavement contraction and consequent sealing member expansion and prevents separation of side walls 60 and 62 from such opposed faces.
  • the upper portions 44 of center plates 36 and 38, which are moved along with joint members 14 and 16 during relative movement of pavement sections 16 and 18 also serve as reinforcement members for side walls 60 and 62 and assist in maintaining pressure sealing against the pavement sections 18 and 20. Because of this arrangement, the internal structure of sealing member can be made simple without the necessity of a complex network of cross bars and ribs commonly employed in many seals.
  • FIGS. 5 and 6 illustrate another form of a joint forming seal assembly 10' of this invention which is mounted on joint support members 14 and 16 in the same manner as the form of invention hereinbefore described, and the same reference characters primed are used to identify similar elements.
  • Sealing member 56' differs from sealing member 56 by the deletion of the bottom wall whereby inner walls 78 and 80 terminate in free end portions 90 and 92 substantially level with the lower ends of side walls 60' and 62'.
  • the V shaped cross bar 72' is located further downwardly than cross bar 72 of sealing member 56 and the angularly related straight portions thereof extend from side walls 60' and 62 and converge downwardly to form a downwardly directed knee 73.
  • Upper plate portions 44' of center plates 36' and 38' are provided with reversely bent portions 94 contiguous with portions 44', respectively, and which are furtherreversely bent in the opposite direction at their lower ends to form clamping end portions 96. As shown in FIGS. 5 and 6, portions 94, 96 define grooves for re DCving and clamping the lower ends of inner walls 78 and therebetween to insure movement of the latteralong with center plates 36' and 38' during contraction of pavement sections 18 and 20.
  • the lower porvtions 44' of center plates 36 and 38 are initially connected together in an abutting relation by means of one or more shear rivets 58.
  • FIG. 5 illustrated sealing member 56' in its maximum compressed condition as initially installed.
  • the contraction thereof will generate pressures urging center plates 36 and 38' apart.
  • shear rivets 58' will rupture, permitting plates 36 and 38' to move away from each other along with their associated support joint members 14 and 16 to expand sealing member 56'.
  • sealing member 56 will be in a slightly compressed condition and will thereafter be compressed or expanded upon movementof joint members 14 and 16 and thereby center plates 36 and 38' toward and away from each other as pavement sections 18 and 20 expand or contract due to temperature variations.
  • FIG. 6 depicts sealing member 56' in an expanded condition whereby center plates 36 and 38' have been moved apart along with joint members 14 and 16 by contraction of pavement sections 18 and 20. It should be noted that the sealing member side walls 60' and 62' are maintained in sealing relation along their entire depths with the opposed faces of pavement sections 18 and 20.
  • the present invention fully accomplishes its intended objects and provides an improved joint forming seal assembly installed in place prior to the pavement pouring operation to form a contraction joint in the surface of the subse quently formed pavement.
  • center plates 36 and 38 connect sealing member 56 to the joint support members 14 and 16 to maintain the sealing member side walls 60 and 62, which are mechanically sealed in the pavement, in pressure sealing engagement against the opposed faces of the adjacent pavement sections at all times and reinforce such side walls to prevent the collapse thereof. Since the sealing member side walls are adequately reinforced by means of center plate upper portions 44, the internal construction of sealing member 56 can be made very simply without the necessity of a network of compression crossbars and ribs, as is common with conventional seals employed in contraction joints. Projections 74 and 76 on the outer faces of side walls 60 and 62 provide a mechanical interlock with the adjoining pavement sections preventing verti cal displacement of side walls 60 and 62 relative to such pavement sections.
  • a joint forming seal assembly for use in a pavement contruction comprising: a pair of movable joint support members adapted to connect a pair of relatively movable adjacent pavement sections; a sealing member comprising an elongated elastic body having side portions engagable against opposed surfaces of said pavement sections; means connecting said sealing member to said joint supports for movement therewith to provide positive pressure sealing of each said side portion of said elastic body against said opposed surfaces of said pavement sections upon relative movement therebetween, said connecting means comprising a pair of center plates, each of said center plates being respectively mounted on one of said joint supports for relative movement therewith and connected to respective side portions of said sealing member, and locking means for locking each of said center plates in fixed position with respect to its respectively associated joint support.
  • each of said side portions is provided with a groove extending upwardly from the lower end thereof and said connecting means include a pair of movable center plates having laterally spaced upper portions inserted in said side portion grooves for supporting said sealing member during compression and expansion thereof.
  • each of said sealing member side portions comprises an outer side wall adapted to be sealed to a pavement section and an inner wall spaced inwardly of said outer side wall in substantial parallelism therewith defining said groove.
  • a joint forming seal assembly according to claim 4 including means for adhesively securing the opposite sides of said center plate upper portion to the opposed faces of said outer side wall and said inner wall defining said groove.
  • a joint forming seal assembly according to claim 7 including a bottom wall formed integral with the lower ends of said sealing member side portions and having angularly related portions converging upwardly to form an inverted V-shaped recess disposed between said side portions.
  • a joint forming seal assembly according to claim 2 wherein said center plates are provided with lower portions laterally offset from the planes of said upper portions; and means securing each of said center plate lower portions to one of said joint support members for movement therewith.
  • a joint forming seal assembly according to claim 10 including means for initially fastening said center plate lower portions together and rupturable upon a predetermined pressure urging said center plates apart.
  • a joint forming seal assembly according to claim 10 wherein said securing means comprises a plurality of tabs struck out from said center plate lower portions fixedly secured to portions of said joint support members, respectively.
  • each of said center plate upper portions comprises a pair of abutting plate portions; one of said plate portions being reversely bent to form a terminal portion engaging the inner face of one of said sealing member side portions.
  • a joint forming seal assembly according to claim 1 including means for initially holding said center plates against separation and rupturable upon a predetermined pressure urging said center plates apart for relative movement away from each other.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
US409426A 1973-10-25 1973-10-25 Joint forming seal assembly Expired - Lifetime US3900271A (en)

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Application Number Priority Date Filing Date Title
US409426A US3900271A (en) 1973-10-25 1973-10-25 Joint forming seal assembly
CA208,599A CA1029230A (fr) 1973-10-25 1974-09-06 Etancheite faisant joint

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190997A (en) * 1978-08-24 1980-03-04 Holt Billie E Means for forming an edge-protected contraction joint
FR2468692A1 (fr) * 1979-10-31 1981-05-08 Arai Motonosuke Joint de dilatation destine aux raccords entre dalles de revetement pour ponts routiers et routes aeriennes
US5538580A (en) * 1994-01-27 1996-07-23 The United States Of America As Represented By The Secretary Of The Navy Split gasket attachment method
US6574933B1 (en) * 1998-04-28 2003-06-10 Vexcolt (Uk) Limited Movement joint

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1586326A (en) * 1924-07-28 1926-05-25 Older Clifford Metallic expansion joint for concrete roads and the like
US2138817A (en) * 1934-01-10 1938-12-06 Cal C Chambers Road joint
US2210355A (en) * 1938-02-28 1940-08-06 Carl H Bauer Formation of expansion joints
US3068763A (en) * 1958-10-06 1962-12-18 Harza Patents Top seal
US3276335A (en) * 1964-01-08 1966-10-04 William F Middlestadt Joint forming structure
US3349675A (en) * 1965-07-30 1967-10-31 Brewer Fitchener Corp Transverse joint assembly for concrete pavements
US3418898A (en) * 1966-10-10 1968-12-31 Grace W R & Co Concrete joint seal
US3455215A (en) * 1967-06-20 1969-07-15 Brewer Titchener Corp Seal for expansion joints
US3593626A (en) * 1968-07-22 1971-07-20 Acme Highway Prod Plastic groove former

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1586326A (en) * 1924-07-28 1926-05-25 Older Clifford Metallic expansion joint for concrete roads and the like
US2138817A (en) * 1934-01-10 1938-12-06 Cal C Chambers Road joint
US2210355A (en) * 1938-02-28 1940-08-06 Carl H Bauer Formation of expansion joints
US3068763A (en) * 1958-10-06 1962-12-18 Harza Patents Top seal
US3276335A (en) * 1964-01-08 1966-10-04 William F Middlestadt Joint forming structure
US3349675A (en) * 1965-07-30 1967-10-31 Brewer Fitchener Corp Transverse joint assembly for concrete pavements
US3418898A (en) * 1966-10-10 1968-12-31 Grace W R & Co Concrete joint seal
US3455215A (en) * 1967-06-20 1969-07-15 Brewer Titchener Corp Seal for expansion joints
US3593626A (en) * 1968-07-22 1971-07-20 Acme Highway Prod Plastic groove former

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190997A (en) * 1978-08-24 1980-03-04 Holt Billie E Means for forming an edge-protected contraction joint
FR2468692A1 (fr) * 1979-10-31 1981-05-08 Arai Motonosuke Joint de dilatation destine aux raccords entre dalles de revetement pour ponts routiers et routes aeriennes
US5538580A (en) * 1994-01-27 1996-07-23 The United States Of America As Represented By The Secretary Of The Navy Split gasket attachment method
US6574933B1 (en) * 1998-04-28 2003-06-10 Vexcolt (Uk) Limited Movement joint

Also Published As

Publication number Publication date
CA1029230A (fr) 1978-04-11

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