CA2153074C - Modular bridge abutment system - Google Patents
Modular bridge abutment system Download PDFInfo
- Publication number
- CA2153074C CA2153074C CA 2153074 CA2153074A CA2153074C CA 2153074 C CA2153074 C CA 2153074C CA 2153074 CA2153074 CA 2153074 CA 2153074 A CA2153074 A CA 2153074A CA 2153074 C CA2153074 C CA 2153074C
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- Canada
- Prior art keywords
- wall
- footing
- metal
- bridge
- support
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a portable bridge, including a novel portable bridge support. The bridge support comprises a wall and a footing. The wall and the footing are comprised of masonry with inlaid weldable plates positioned to allow attachment of the wall and the footing by welding the plates. The bridge may be transported in unassembled form and constructed from its components on site at a remote location. The bridge is adapted to provide a sturdy road crossing capable of handling commercial traffic on remote roadways. The bridge components are adapted for simple mounting and demounting, so that the bridge components may be reused.
Description
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IIODUIAR PORTABLE BRIDGE
Field of the Invention The invention is in the f ield of portable bridge 5 structures and methods for mounting an~ demounting portable bridges .
Bac l~ r ~-ul~d of the Invention Special structures are often required on roads in 10 remote areas to cross gaps, such as waterways. A variety of approaches are used to cross such gaps. On logging roads, for example, creek crossings are often built by laying a culvert in a stream bed and covering the culvert with roAdway fill material. Bridges may be used on remote 15 roads to cross some gaps. On logging roads, it is often convenient to build bridges out of timber.
Recently, it has been recognized that previous methods of constructillg bridges and waterway crossings on 20 remote roads typically cause significant environmental damage. It has been recognized that any disturbance of the bed of a natural waterway may change forever the suitability of the waterway for a particular species. For example, salmon may no longer spawn along creeks that have 25 been altered by the introduction of culverts. When a bridge is constructed of timber, the bridge nPrP~rily has a limited life. Timbers sp~nnin~ the waterway usually deteriorate and may eventually collapse into the waterway, with adverse consequences to the biology of the waterway.
Remote roads pose special problems for the design of suitable bridges and waterway crossings. Since such roads are often temporary in nature, it is desirable that they be relatively inexpensive to construct. In some 35 cases, such roads must be closed to public traffic after commercial use of the road has come to an end.
Accordingly, it would be desirable if bridges and waterway crossings on such roads could be made to be mountable and demountable using common machinery and at relatively low 21~3071 c06t. Preferably, such crossings should also be reusable.
The conditions under which remote roads are used typically necessitate a sturdy design for bridges and 5 waterway crossings on such roads. On logging roads for example, heavily loaded trucks will typically make frequent use of such crossings. In many areas, waterways are subject to dramatic changes in volume, so that waterway cros6ings must be adapted to avoid destruction under high-10 water conditions. Si];nilarly, the method of mounting anddemounting crossings on remote road6 should be simple and the, }n~nts should l~e capable of enduring transportation under difficult conditions.
15 ~ rv of the Invention The invention provides a portable bridge, including a novel portable bridge support. The bridge may be transported in lln~ Pmhled form and constructed from its ' ~n.,nts at a remote location. The bridge is adapted to 20 provide a sturdy road crossing capable of handling commercial traffic on remote roadways. The bridge ~ts are adapted for simple mounting and demounting, so that the bridge components may be reused.
The major components of the portable bridge support are a masonry footing and a masonry wall. The footing and the wall are provided with metal plates. In one ~ ;r-nt~ the wall and footing are made of reinforced concrete. The metal plates may be inlaid in the masonry wall and footing. The plates may be made of steel. The plates are arranged to facilitate assembly of the bridge support and the bridge by welding various of the plates to one another. The bridge support and the bridge may be demounted by removing the welds between the plates. The welds may be removed by air arcing, as described in more detail below.
In one aspect, the invention provides a method of mounting and demounting a portable bridge. To mount the bridge, the following steps may be carried out in an appropriate order:
i) Form foundations spaced apart on either side of a gap (for example, the gap may be a waterway having banks and the foundations may be formed in the banks of the waterway).
ii) Place a masonry footing on each foundation.
Each footing has a metal footing plate attached to its upper surf ace .
iii) Place a masonry wall on each footing. Each wall has a metal wall base plate attached to its lower surface and a metal wall top plate attached to its upper surface.
iv) Weld the wall base plate on each wall to one of the footing plates on one of the footings, to fasten each one of the walls to one of the f ootings .
v) Place a metal girder (or girders) across the top surfaces of the walls in contact with the wall top plates and spanning the gap.
vi) Weld the girder (or girders) to the wall top plates .
~o demount the bridge, the following steps may be carried out in an appropriate order:
i) Remove the welds between the girder (or girders) and the wall top plates by air arcing.
Air arcing is a process in which a stream of high pressure air is used to remove melted weld material. Typically, the weld material is melted by forming an arc between a carbon rod and the weld materia l .
ii) Remove the girder (or girders).
iii) Remove the welds between the wall base plates and the footing plates by air arcing.
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iv) Remove the wall6 .
v) Remove the footings.
In mounting the bridge, a number of additional steps may be carried o~lt. A bridge deck may be provided on top of the metal girders. Road bed material may be backfilled against the sides of the walls that face away from the gap or waterway. An anchor may be provided to anchor the walls. If one or more of these additional steps are used in mounting the bridge, appropriate corresponding steps may be used to demount the bridge, ie. the bridge deck, backfill material and anchor may removed.
In another aspect, the invention provides an assembled portable bridge support. The support includes:
a) a masonry footing;
b) a metal footin~ plate attached to the upper surface of the f ooting;
c) a masonry wall;
d) a metal wall base plate attached to the lower surface of the wall and welded to the footing plate, to fasten the wall to the footing; and, e) a metal wall top plate attached to the upper surface of the wall.
If the wall and footing are made of reinforced concrete, the footing plate, wall base plate and the wall top plate may be attached, respectively, to the footing, the lower surface of the wall and the upper surface of the wall, by being integrally formed in the concrete of those components of the support. For example, the plates may be positioned in moulds for the wall and the footings so that the plates become part of those structures when the concrete is poured into the moulds and then hardens. The plates may be held in the concrete of the footing and wall by anchor posts embedded in the concrete.
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In another aspect, the invention provides an assembled portable bridge made from two of the assembled portable bridge supports described above; the supports being placed apart from one another to form a gap. Metal 5 girders supported on the upper surf aces of the support walls are then used to span the gap between the supports.
The girders may be w~lded to the wall top plates. An anchor may be attached to the walls of the supports to help hold the supports in place.
The invention also provides an unassembled modular portable bridge support. The unassembled support includes a masonry footing with a metal footing plate attached to its upper surf ace . The other component of the 15 support is a masonry wall with a metal wall base plate attached to its lower surface and a metal wall top plate attached to its upper surface. The wall is adapted so that it is positionable on the footing so that the wall base plate is on top of the footing plate. The wall and the 20 footing may each be sized to fit within the box of a standard dump truck, to facilitate transportation of the portable support to remote areas.
In one aspect, the invention provides an 25 l~n~s~ led modular pc>rtable bridge. The bridge includes a plurality of masonr~ footings, each having at least one metal footing plate attached to its upper surface. The unassembled bridge also includes a plurality of masonry walls. Each wall has at least one metal wall base plate 30 attached to its lower surface and at least one metal wall top plate attached to its upper surface. A number of metal girders and bridge deck members are also be included. Each wall is positionable on top of a footing, so that the wall base plate on the wall is on top of a footing plate. Each 35 girder is positionable on the wall top plates to span a gap between the walls. The deck members are positionable to form a bridge deck supported by the girders. The walls,
IIODUIAR PORTABLE BRIDGE
Field of the Invention The invention is in the f ield of portable bridge 5 structures and methods for mounting an~ demounting portable bridges .
Bac l~ r ~-ul~d of the Invention Special structures are often required on roads in 10 remote areas to cross gaps, such as waterways. A variety of approaches are used to cross such gaps. On logging roads, for example, creek crossings are often built by laying a culvert in a stream bed and covering the culvert with roAdway fill material. Bridges may be used on remote 15 roads to cross some gaps. On logging roads, it is often convenient to build bridges out of timber.
Recently, it has been recognized that previous methods of constructillg bridges and waterway crossings on 20 remote roads typically cause significant environmental damage. It has been recognized that any disturbance of the bed of a natural waterway may change forever the suitability of the waterway for a particular species. For example, salmon may no longer spawn along creeks that have 25 been altered by the introduction of culverts. When a bridge is constructed of timber, the bridge nPrP~rily has a limited life. Timbers sp~nnin~ the waterway usually deteriorate and may eventually collapse into the waterway, with adverse consequences to the biology of the waterway.
Remote roads pose special problems for the design of suitable bridges and waterway crossings. Since such roads are often temporary in nature, it is desirable that they be relatively inexpensive to construct. In some 35 cases, such roads must be closed to public traffic after commercial use of the road has come to an end.
Accordingly, it would be desirable if bridges and waterway crossings on such roads could be made to be mountable and demountable using common machinery and at relatively low 21~3071 c06t. Preferably, such crossings should also be reusable.
The conditions under which remote roads are used typically necessitate a sturdy design for bridges and 5 waterway crossings on such roads. On logging roads for example, heavily loaded trucks will typically make frequent use of such crossings. In many areas, waterways are subject to dramatic changes in volume, so that waterway cros6ings must be adapted to avoid destruction under high-10 water conditions. Si];nilarly, the method of mounting anddemounting crossings on remote road6 should be simple and the, }n~nts should l~e capable of enduring transportation under difficult conditions.
15 ~ rv of the Invention The invention provides a portable bridge, including a novel portable bridge support. The bridge may be transported in lln~ Pmhled form and constructed from its ' ~n.,nts at a remote location. The bridge is adapted to 20 provide a sturdy road crossing capable of handling commercial traffic on remote roadways. The bridge ~ts are adapted for simple mounting and demounting, so that the bridge components may be reused.
The major components of the portable bridge support are a masonry footing and a masonry wall. The footing and the wall are provided with metal plates. In one ~ ;r-nt~ the wall and footing are made of reinforced concrete. The metal plates may be inlaid in the masonry wall and footing. The plates may be made of steel. The plates are arranged to facilitate assembly of the bridge support and the bridge by welding various of the plates to one another. The bridge support and the bridge may be demounted by removing the welds between the plates. The welds may be removed by air arcing, as described in more detail below.
In one aspect, the invention provides a method of mounting and demounting a portable bridge. To mount the bridge, the following steps may be carried out in an appropriate order:
i) Form foundations spaced apart on either side of a gap (for example, the gap may be a waterway having banks and the foundations may be formed in the banks of the waterway).
ii) Place a masonry footing on each foundation.
Each footing has a metal footing plate attached to its upper surf ace .
iii) Place a masonry wall on each footing. Each wall has a metal wall base plate attached to its lower surface and a metal wall top plate attached to its upper surface.
iv) Weld the wall base plate on each wall to one of the footing plates on one of the footings, to fasten each one of the walls to one of the f ootings .
v) Place a metal girder (or girders) across the top surfaces of the walls in contact with the wall top plates and spanning the gap.
vi) Weld the girder (or girders) to the wall top plates .
~o demount the bridge, the following steps may be carried out in an appropriate order:
i) Remove the welds between the girder (or girders) and the wall top plates by air arcing.
Air arcing is a process in which a stream of high pressure air is used to remove melted weld material. Typically, the weld material is melted by forming an arc between a carbon rod and the weld materia l .
ii) Remove the girder (or girders).
iii) Remove the welds between the wall base plates and the footing plates by air arcing.
21~30~
iv) Remove the wall6 .
v) Remove the footings.
In mounting the bridge, a number of additional steps may be carried o~lt. A bridge deck may be provided on top of the metal girders. Road bed material may be backfilled against the sides of the walls that face away from the gap or waterway. An anchor may be provided to anchor the walls. If one or more of these additional steps are used in mounting the bridge, appropriate corresponding steps may be used to demount the bridge, ie. the bridge deck, backfill material and anchor may removed.
In another aspect, the invention provides an assembled portable bridge support. The support includes:
a) a masonry footing;
b) a metal footin~ plate attached to the upper surface of the f ooting;
c) a masonry wall;
d) a metal wall base plate attached to the lower surface of the wall and welded to the footing plate, to fasten the wall to the footing; and, e) a metal wall top plate attached to the upper surface of the wall.
If the wall and footing are made of reinforced concrete, the footing plate, wall base plate and the wall top plate may be attached, respectively, to the footing, the lower surface of the wall and the upper surface of the wall, by being integrally formed in the concrete of those components of the support. For example, the plates may be positioned in moulds for the wall and the footings so that the plates become part of those structures when the concrete is poured into the moulds and then hardens. The plates may be held in the concrete of the footing and wall by anchor posts embedded in the concrete.
21~3~7~
In another aspect, the invention provides an assembled portable bridge made from two of the assembled portable bridge supports described above; the supports being placed apart from one another to form a gap. Metal 5 girders supported on the upper surf aces of the support walls are then used to span the gap between the supports.
The girders may be w~lded to the wall top plates. An anchor may be attached to the walls of the supports to help hold the supports in place.
The invention also provides an unassembled modular portable bridge support. The unassembled support includes a masonry footing with a metal footing plate attached to its upper surf ace . The other component of the 15 support is a masonry wall with a metal wall base plate attached to its lower surface and a metal wall top plate attached to its upper surface. The wall is adapted so that it is positionable on the footing so that the wall base plate is on top of the footing plate. The wall and the 20 footing may each be sized to fit within the box of a standard dump truck, to facilitate transportation of the portable support to remote areas.
In one aspect, the invention provides an 25 l~n~s~ led modular pc>rtable bridge. The bridge includes a plurality of masonr~ footings, each having at least one metal footing plate attached to its upper surface. The unassembled bridge also includes a plurality of masonry walls. Each wall has at least one metal wall base plate 30 attached to its lower surface and at least one metal wall top plate attached to its upper surface. A number of metal girders and bridge deck members are also be included. Each wall is positionable on top of a footing, so that the wall base plate on the wall is on top of a footing plate. Each 35 girder is positionable on the wall top plates to span a gap between the walls. The deck members are positionable to form a bridge deck supported by the girders. The walls,
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footings, girders and deck members may be sized to fit within the box of a standard dump truck, to facilitate tran6portation of the portable bridge to remote areas f or assembly .
Brief DescriPtion of the Drawinas Figure 1 is an isometric view showing an assembled portable bridge support of the invention, including the attachment of anchors to the wall.
Figure 2 is a partially fragmented side elevational view in partial section showing one end of an assembled portable bri dge of the invention, in which the bridge spans a waterway.
Detailed Description As shown in detail in Figure 1, the invention provides an assembled portable bridge support 10. Support 10 includes masonry wall 12 and masonry footing 14. Wall 12 and footing 14 may be comprised of concrete (with )1 UpL iate structural characteristics such as a minimum compressional strength and maximum slump) moulded in forms with appropriate internal rebar reinforcing rods. Bottom surface 28 of wall 12 rests on top surface 30 of footing 14. Metal wall base plates 26 are attached to bottom surface 28 of wall 12. Metal wall end plates 24 are attached to the lateral end surfaces 22 of wall 12, to reinforce and protect the end corners of wall 12. Wall base plates 26 and wzlll end plates 24 may be made from steel angle iron. Lifting eyes (not shown) may be attached to wall end plates 24. Wall end plates 24 and wall base plates 26 are present on both the front side 16 and the back side 18 of wall 12. Metal outer footing plates 32 and metal inner footing p] ates 34 are attached to top surface 30 of footing 14. Wall base plates 26 are welded to inner footing plates 34 and outer footing plates 32, to attach wall 12 to footing ~4. Metal wall top plates 21 are 2~S~4 attached to top surface 20 of wall 12.
Wall 12 may be skewed on footing 14, to adapt support 10 for use in a particular road crossing. The 5 positioning of footing plates 32, 34 and wall base plates 26 as shown in Figure 1 facilitate6 this flexibility in mounting orientation, since a portion of the wall base plates 26 will lie over a portion of each of the footing plates 32, 34 irrespective of the alignment of wall 12 and 10 footing 14.
Anchor 40 may be attached to wall 12. The requirement for anchor 40 will depend in part on the height of wall 12. Anchor 40 is made up of rods 42, and cables 48 attached to eye 45 of rods 42 and buried log 49. Arrows 41 in Figure 1 point in the direction of buried log 49, shown in Figure 2. Rods 42 pass through holes in wall 12. Nuts 46 and washers 47 on t~readed portions 44 of rods 42 may be used to retain rods 42 in wall 12.
Footing plates 32, 34, wall base plates 26, wall end plates 24 and wall top plates 21 may be attached to wall 12 and footing 14 by being integrally formed in wall 12 and footing 14 wheL~ wall 12 and footing 14 are formed from concrete. Plates 21, 24, 26, 32 or 34 may be held in the concrete by one or more anchor posts (not shown) attached to the plates 21, 24, 26, 32 or 34 and ~ d in the precast concrete of wall 12 and footing 14.
In another aspect, the invention provides an assembled portable bridge 50 made from two assembled portable bridge supports 10; supports 10 being placed apart from one another to form a gap (one half of the bridge is shown in the partially fragmented view in Figure 2, with bridge 50 spanning creek 64). Bottom surface 31 of footing 14 may rest on firm bearing material such as shot rock (not shown) on foundation 62. In some locations, piles (not 2~ ~3074 . ~
shown) may be n~ C~ry to provide a firm foundation for footing 14. Each footing 14 has metal footing plates 32, 34 attached to its upper surface 30. Metal girders 52 supported on upper surfaces 20 of walls 12 span creek 64 between supports 10. Girders 52 may be joined to wall top plates 21 by welds 53. Bridge deck 56 may be provided, supported on deck supports 54 on top of metal girders 52.
Deck 56 and deck supports 54 may be bolted to girders 52.
Fill material 59 may be backfilled against sides 18 of walls 12 that face away from the gap or waterway 64, to bring the road level 5~ up to the level of deck 56.
Bulkhead 58 may be used to hold back fill material 59.
Bulkhead 58 may also assist in bearing lateral forces on bridge 50. If nC~ Ss;~ry~ a wing wall (not shown) may be constructed on either side of bridge 50 to help retain fill material 59. Anchor ~0 may be attached by cables 48 and rods 42 to walls 12, to help keep support lo in place.
Rip-rap 60 may be filled in along bank of creek 64 over footing 14 and up aga.inst front side 16 of wall 12, to .protect and stabilize supports lo. Some or all of the welds may be waterproofed, for example with waterproofing tape .
In one aspect, the invention provides a method of mounting and demounting portable bridge 50. The following steps may be carried out in an appropriate seguence to mount bridge 50:
i) Form spaced apart foundations 62 on either side of a gap (shown as creek 64 in Figure 2).
ii) Place footing 14 (which may be made of reinforced concrete) on each foundation 62.
Bottom surface 31 of footing 14 may rest on firm bearing material such as shot rock (not shown) on foundation 62. In some locations, piles (not shown) may be necessary to provide a f irm foundation for footing 14. Each footing 14 has metal footing plates 32, 34 attached to its upper 21~7~
,. --g surface 30.
iii) Place wall 12 (which may be made of reinforced concrete) on each footing 14. Each wall 12 has metal wall base plates 26 attached to its lower surface 28 and metal wall top plates 21 attached to its upper surface 20.
iv) Weld wall base plates 26 on each wall 12 to the footing ~plates 32 on one of the footings 14, to fasten each wall 12 to one of the footings 14.
lo v) Place a girder 52 (or girders, at least part of which are made of metal) across top surfaces 20 of walls 12 in contact with wall top plates 21, spanning gap or creek 64.
vi) Weld girder 52 (or girders) to wall top 15 plates 21.
To facilitate re-use of the components of the bridge, the following steps may be carried out in an appropriate sequence to demount the bridge:
i) Remove the welds (not shown) between girder 52 (or girders~ and wall top plates 21 by air arcing. Air arcing is a process in which a stream of h igh pressure air is used to remove weld material that has been melted. Typically, the weld material is melted by using a carbon rod to form an arc with the weld material. Air arcing may be used to remove weld material without overheating and damaging the plates, since the volume of air use to blow the weld material away tends to keep the plates relatively cool .
ii) Remove girder 52 (or girders);
iii) Remove ~elds 36 between wall base plates 26 and footing plates 32, 34 by air arcing.
iv) Remove walls 12; and, v) Remove footings 14.
2i~3g~4 To mount bridge 50, further steps may be taken, including one or more of the following steps. A bridge deck 56 may be supported on deck supports 54 on top of metal girders 52. Deck 56 and deck supports 54 may be bolted to girders 52. Fill material 59 may be backfilled against sides 18 of walls 12 that face away from the gap or waterway 64, to bring the road level 57 up to the level of deck 56. Bulkhead 58 may be used to hold back fill material 59. If n~ss~ry, a wing wall tnot shown) may be constructed on either side of bridge 50 to retain fill material 59. Anchor 40 may be attached by cables 48 and rods 42 to walls 12, to help keep support 10 in place.
Rip-rap 60 may be filled in along bank of creek 64 over footing 14 and up against front side 16 of wall 12. Some or ~ll of the welds ma~ be waterproofed with, for example, waterproofing tape. If some or all of these additional steps are used to mount bridge 50, appropriate steps may be taken to demount bridge 50, ie. deck 56, deck supports 54, fill material 59, rip-rap 60 and anchor 40 may removed.
The components of support 10 shown in Figure 1 may be provided in an unassembled modular form. The llni3c5~mhled support may include: masonry footing 14 with metal footing plates 32, 34 attached to its upper surface 30; and, masonry wall 12 with metal wall base plates 26 attached to its lower surface 28 and metal wall top plates 21 attached to its uppPr surface 20. Wall 12 and footing 14 may be made of reinforced concrete. Wall 12 is adapted so that it is positionable on footing 14 so that wall base plates 26 are on top of footing plates 32, 34. Wall 12 and footing 14 may each b~ sized to fit within the box of a standard dump truck, to facilitate transportation of the portable support to remote areas.
The components of bridge 50 shown in Figure 2 may be provided in lln~cs~hled modular form. In this form, bridge 50 may include a plurality of masonry footings 14, 2~ 74 . ~
each having metal footing plates 32, 34 attached to its upper surface 30. The l]n~omhled bridge 50 may also include a plurality of masonry walls 12. Each wall 12 has metal wall base plates 26 attached to its lower surface 28 S and metal wall top plates 21 attached to its upper surface 20. Walls 12 and footings 14 may be made of reinforced concrete. A number of rigid girders 52 (which may be metal, such as steel), bridge deck members 56 and bridge deck supports 54 may also be included. Each wall 12 is 10 positionable on top of a footing 14, so that wall base plates 26 on wall 12 are on top of footing plates 32, 34.
Each girder 52 is positionable on wall top plates 21 to span the gap, such as creek 64, between walls 12. Deck members 56 and deck support members 54 are positionable to 15 form a surface for driving on supported by girders 52.
Walls 12, footings 14, girders 52, deck members 56 and deck support members 54 may be sized to f it within the box of a standard dump truck, to facilitate transportation of the portable bridge components in modular form to remote areas 20 for assembly.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modif ications are po~,sible in the practice of this 25 invention without departing from the spirit or scope thereof. For example, footing 14 and wall 12 may be made of a material other than masonry. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
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footings, girders and deck members may be sized to fit within the box of a standard dump truck, to facilitate tran6portation of the portable bridge to remote areas f or assembly .
Brief DescriPtion of the Drawinas Figure 1 is an isometric view showing an assembled portable bridge support of the invention, including the attachment of anchors to the wall.
Figure 2 is a partially fragmented side elevational view in partial section showing one end of an assembled portable bri dge of the invention, in which the bridge spans a waterway.
Detailed Description As shown in detail in Figure 1, the invention provides an assembled portable bridge support 10. Support 10 includes masonry wall 12 and masonry footing 14. Wall 12 and footing 14 may be comprised of concrete (with )1 UpL iate structural characteristics such as a minimum compressional strength and maximum slump) moulded in forms with appropriate internal rebar reinforcing rods. Bottom surface 28 of wall 12 rests on top surface 30 of footing 14. Metal wall base plates 26 are attached to bottom surface 28 of wall 12. Metal wall end plates 24 are attached to the lateral end surfaces 22 of wall 12, to reinforce and protect the end corners of wall 12. Wall base plates 26 and wzlll end plates 24 may be made from steel angle iron. Lifting eyes (not shown) may be attached to wall end plates 24. Wall end plates 24 and wall base plates 26 are present on both the front side 16 and the back side 18 of wall 12. Metal outer footing plates 32 and metal inner footing p] ates 34 are attached to top surface 30 of footing 14. Wall base plates 26 are welded to inner footing plates 34 and outer footing plates 32, to attach wall 12 to footing ~4. Metal wall top plates 21 are 2~S~4 attached to top surface 20 of wall 12.
Wall 12 may be skewed on footing 14, to adapt support 10 for use in a particular road crossing. The 5 positioning of footing plates 32, 34 and wall base plates 26 as shown in Figure 1 facilitate6 this flexibility in mounting orientation, since a portion of the wall base plates 26 will lie over a portion of each of the footing plates 32, 34 irrespective of the alignment of wall 12 and 10 footing 14.
Anchor 40 may be attached to wall 12. The requirement for anchor 40 will depend in part on the height of wall 12. Anchor 40 is made up of rods 42, and cables 48 attached to eye 45 of rods 42 and buried log 49. Arrows 41 in Figure 1 point in the direction of buried log 49, shown in Figure 2. Rods 42 pass through holes in wall 12. Nuts 46 and washers 47 on t~readed portions 44 of rods 42 may be used to retain rods 42 in wall 12.
Footing plates 32, 34, wall base plates 26, wall end plates 24 and wall top plates 21 may be attached to wall 12 and footing 14 by being integrally formed in wall 12 and footing 14 wheL~ wall 12 and footing 14 are formed from concrete. Plates 21, 24, 26, 32 or 34 may be held in the concrete by one or more anchor posts (not shown) attached to the plates 21, 24, 26, 32 or 34 and ~ d in the precast concrete of wall 12 and footing 14.
In another aspect, the invention provides an assembled portable bridge 50 made from two assembled portable bridge supports 10; supports 10 being placed apart from one another to form a gap (one half of the bridge is shown in the partially fragmented view in Figure 2, with bridge 50 spanning creek 64). Bottom surface 31 of footing 14 may rest on firm bearing material such as shot rock (not shown) on foundation 62. In some locations, piles (not 2~ ~3074 . ~
shown) may be n~ C~ry to provide a firm foundation for footing 14. Each footing 14 has metal footing plates 32, 34 attached to its upper surface 30. Metal girders 52 supported on upper surfaces 20 of walls 12 span creek 64 between supports 10. Girders 52 may be joined to wall top plates 21 by welds 53. Bridge deck 56 may be provided, supported on deck supports 54 on top of metal girders 52.
Deck 56 and deck supports 54 may be bolted to girders 52.
Fill material 59 may be backfilled against sides 18 of walls 12 that face away from the gap or waterway 64, to bring the road level 5~ up to the level of deck 56.
Bulkhead 58 may be used to hold back fill material 59.
Bulkhead 58 may also assist in bearing lateral forces on bridge 50. If nC~ Ss;~ry~ a wing wall (not shown) may be constructed on either side of bridge 50 to help retain fill material 59. Anchor ~0 may be attached by cables 48 and rods 42 to walls 12, to help keep support lo in place.
Rip-rap 60 may be filled in along bank of creek 64 over footing 14 and up aga.inst front side 16 of wall 12, to .protect and stabilize supports lo. Some or all of the welds may be waterproofed, for example with waterproofing tape .
In one aspect, the invention provides a method of mounting and demounting portable bridge 50. The following steps may be carried out in an appropriate seguence to mount bridge 50:
i) Form spaced apart foundations 62 on either side of a gap (shown as creek 64 in Figure 2).
ii) Place footing 14 (which may be made of reinforced concrete) on each foundation 62.
Bottom surface 31 of footing 14 may rest on firm bearing material such as shot rock (not shown) on foundation 62. In some locations, piles (not shown) may be necessary to provide a f irm foundation for footing 14. Each footing 14 has metal footing plates 32, 34 attached to its upper 21~7~
,. --g surface 30.
iii) Place wall 12 (which may be made of reinforced concrete) on each footing 14. Each wall 12 has metal wall base plates 26 attached to its lower surface 28 and metal wall top plates 21 attached to its upper surface 20.
iv) Weld wall base plates 26 on each wall 12 to the footing ~plates 32 on one of the footings 14, to fasten each wall 12 to one of the footings 14.
lo v) Place a girder 52 (or girders, at least part of which are made of metal) across top surfaces 20 of walls 12 in contact with wall top plates 21, spanning gap or creek 64.
vi) Weld girder 52 (or girders) to wall top 15 plates 21.
To facilitate re-use of the components of the bridge, the following steps may be carried out in an appropriate sequence to demount the bridge:
i) Remove the welds (not shown) between girder 52 (or girders~ and wall top plates 21 by air arcing. Air arcing is a process in which a stream of h igh pressure air is used to remove weld material that has been melted. Typically, the weld material is melted by using a carbon rod to form an arc with the weld material. Air arcing may be used to remove weld material without overheating and damaging the plates, since the volume of air use to blow the weld material away tends to keep the plates relatively cool .
ii) Remove girder 52 (or girders);
iii) Remove ~elds 36 between wall base plates 26 and footing plates 32, 34 by air arcing.
iv) Remove walls 12; and, v) Remove footings 14.
2i~3g~4 To mount bridge 50, further steps may be taken, including one or more of the following steps. A bridge deck 56 may be supported on deck supports 54 on top of metal girders 52. Deck 56 and deck supports 54 may be bolted to girders 52. Fill material 59 may be backfilled against sides 18 of walls 12 that face away from the gap or waterway 64, to bring the road level 57 up to the level of deck 56. Bulkhead 58 may be used to hold back fill material 59. If n~ss~ry, a wing wall tnot shown) may be constructed on either side of bridge 50 to retain fill material 59. Anchor 40 may be attached by cables 48 and rods 42 to walls 12, to help keep support 10 in place.
Rip-rap 60 may be filled in along bank of creek 64 over footing 14 and up against front side 16 of wall 12. Some or ~ll of the welds ma~ be waterproofed with, for example, waterproofing tape. If some or all of these additional steps are used to mount bridge 50, appropriate steps may be taken to demount bridge 50, ie. deck 56, deck supports 54, fill material 59, rip-rap 60 and anchor 40 may removed.
The components of support 10 shown in Figure 1 may be provided in an unassembled modular form. The llni3c5~mhled support may include: masonry footing 14 with metal footing plates 32, 34 attached to its upper surface 30; and, masonry wall 12 with metal wall base plates 26 attached to its lower surface 28 and metal wall top plates 21 attached to its uppPr surface 20. Wall 12 and footing 14 may be made of reinforced concrete. Wall 12 is adapted so that it is positionable on footing 14 so that wall base plates 26 are on top of footing plates 32, 34. Wall 12 and footing 14 may each b~ sized to fit within the box of a standard dump truck, to facilitate transportation of the portable support to remote areas.
The components of bridge 50 shown in Figure 2 may be provided in lln~cs~hled modular form. In this form, bridge 50 may include a plurality of masonry footings 14, 2~ 74 . ~
each having metal footing plates 32, 34 attached to its upper surface 30. The l]n~omhled bridge 50 may also include a plurality of masonry walls 12. Each wall 12 has metal wall base plates 26 attached to its lower surface 28 S and metal wall top plates 21 attached to its upper surface 20. Walls 12 and footings 14 may be made of reinforced concrete. A number of rigid girders 52 (which may be metal, such as steel), bridge deck members 56 and bridge deck supports 54 may also be included. Each wall 12 is 10 positionable on top of a footing 14, so that wall base plates 26 on wall 12 are on top of footing plates 32, 34.
Each girder 52 is positionable on wall top plates 21 to span the gap, such as creek 64, between walls 12. Deck members 56 and deck support members 54 are positionable to 15 form a surface for driving on supported by girders 52.
Walls 12, footings 14, girders 52, deck members 56 and deck support members 54 may be sized to f it within the box of a standard dump truck, to facilitate transportation of the portable bridge components in modular form to remote areas 20 for assembly.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modif ications are po~,sible in the practice of this 25 invention without departing from the spirit or scope thereof. For example, footing 14 and wall 12 may be made of a material other than masonry. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Claims (11)
1. A modular support for a portable bridge comprising:
(a) an elongated footing constructed from masonry, said footing having a first longitudinal axis and comprising at least one first metal plate on an upper surface thereof; and (b) an elongated upstanding wall constructed from masonry, said wall having a second longitudinal axis and comprising at least one second metal plate on a lower surface thereof;
wherein said wall is securely and removably connectable to said footing by positioning said wall lower surface on said footing upper surface such that said second longitudinal axis extends coaxially or at a selected angle relative to said first longitudinal axis and welding said first and second metal plates together.
(a) an elongated footing constructed from masonry, said footing having a first longitudinal axis and comprising at least one first metal plate on an upper surface thereof; and (b) an elongated upstanding wall constructed from masonry, said wall having a second longitudinal axis and comprising at least one second metal plate on a lower surface thereof;
wherein said wall is securely and removably connectable to said footing by positioning said wall lower surface on said footing upper surface such that said second longitudinal axis extends coaxially or at a selected angle relative to said first longitudinal axis and welding said first and second metal plates together.
2. The support of claim 1, wherein said footing comprises a plurality of first metal plates on said upper surface and said wall comprises a plurality of second metal plates on said lower surface.
3. The support of claim 2, wherein said first and second metal plates are inset in said masonry.
4. The support of claim 1, wherein said second metal plate substantially covers at least said lower surface and side surfaces of said wall.
5. The support of claim 1, wherein said wall further comprises at least one third metal plate on an upper surface thereof for removably connecting said wall to bridge support girders.
6. The support of claim 1, wherein said wall and said footing are each sized to fit within the box of a standard dump truck.
7. The support of claim 1, wherein said wall and said footing each weigh less than 15,000 pounds.
8. A pair of modular abutments for supporting a portable bridge, each abutment comprising:
(a) an elongated footing having a longitudinal axis and comprising a metal upper surface; and (b) an upstanding wall comprising a metal lower surface, wherein said wall is securely and removably connectable to said footing in a selected orientation relative to said longitudinal axis by welding said metal upper and lower surfaces together.
(a) an elongated footing having a longitudinal axis and comprising a metal upper surface; and (b) an upstanding wall comprising a metal lower surface, wherein said wall is securely and removably connectable to said footing in a selected orientation relative to said longitudinal axis by welding said metal upper and lower surfaces together.
9. The abutments of claim 8, wherein said footing is constructed from masonry and said metal upper surface comprises at least one metal plate attached to said masonry.
The abutments of claim 9, wherein said wall is constructed from masonry and said metal lower surface comprises at least one metal plate attached to said masonry.
11. A method of installing a support structure for a portable bridge for spanning a gap, said method comprising the steps of:
(a) providing a pair of modular supports as defined in claim 1;
(b) positioning the footing of one of said supports on one side of said gap and the footing for the other one of said supports on the other side of said gap;
(c) positioning each of said walls on a corresponding one of said footings such that said second metal plate rests on said first metal plate;
(d) alignining said walls so that they extend in substantially parallel planes; and (e) removably connecting each of said walls to a corresponding one of said footings by welding said first and second metal plates together.
(a) providing a pair of modular supports as defined in claim 1;
(b) positioning the footing of one of said supports on one side of said gap and the footing for the other one of said supports on the other side of said gap;
(c) positioning each of said walls on a corresponding one of said footings such that said second metal plate rests on said first metal plate;
(d) alignining said walls so that they extend in substantially parallel planes; and (e) removably connecting each of said walls to a corresponding one of said footings by welding said first and second metal plates together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2153074 CA2153074C (en) | 1995-06-30 | 1995-06-30 | Modular bridge abutment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2153074 CA2153074C (en) | 1995-06-30 | 1995-06-30 | Modular bridge abutment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2153074A1 CA2153074A1 (en) | 1996-12-31 |
| CA2153074C true CA2153074C (en) | 2000-01-11 |
Family
ID=4156157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2153074 Expired - Fee Related CA2153074C (en) | 1995-06-30 | 1995-06-30 | Modular bridge abutment system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2153074C (en) |
-
1995
- 1995-06-30 CA CA 2153074 patent/CA2153074C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2153074A1 (en) | 1996-12-31 |
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