Abstract: An arch structure for use in forming an overfilled structure includes at least one footing and at least one precast concrete bridge element forming an open bottom arch structure that is supported on the at least one footing. The arch structure has an upper portion, that may be formed by a first half-ellipse shape, and a lower portion, that may be formed by part of a second half-ellipse shape. The upper portion and lower portion meet at an elevation along the rise of the arch structure, and such elevation defines the largest span of the arch structure. The arch structure includes lower ends that come back inward toward each other, such that the span at the bottom of the arch structure is less than the largest span.

Abstract: The present invention is directed to an apparatus for use in constructing a bridge comprised of a superstructure and a substructure that supports the superstructure and is comprised of foundations and piers. In one embodiment, the apparatus is comprised of a truss structure, a trolley that is supported by the truss structure and used to move materials used to build the bridge along at least a portion of the truss, a support structure for supporting the truss structure, and rotatable lead that can receive a substructure related element from the trolley and be used to rotate the element to a desired position to further the construction of the bridge.

Abstract: Methods and systems for building a stress ribbon structure over an opening via incremental launching are disclosed. Temporary support structures are constructed adjacent to a permanent support structure. The stress ribbon structure is constructed in a staging area and in sections that are suspended between the temporary support structures. Anchorage panels at each end of a section engage a blister on the temporary and permanent structures. This arrangement allows completed sections to be launched from the temporary support structure onto and along the permanent support structure. Sections are individually constructed and launched and adjacent sections abut along a lateral edge. Adjacent sections are aligned by adjusting tension in integral support cables and their ends pivot or rotate about the blisters via a bearing system with both rotational flexibility and low friction to support sliding in the direction of launching.

Abstract: A method and apparatus for the placement of a bridge element using a vehicle having a placement arm, and a use of the apparatus. The placement arm has at least one drive element adapted to cooperate with the bridge element. A braking device is disposed in the vicinity of the deposition end of the placement arm and cooperates with the bridge element during a placement procedure. The bridge element is braked via an engagement element of the braking device. Movement of the bridge element in a longitudinal direction can be measured and monitored, and in the event of an uncontrolled movement the bridge element can be braked.

Abstract: The invention relates to a span (2) for railway tracks with a self-supporting U-shaped structure (3), defining a section of the path for a piece of rolling stock (1), travelling on the railway track and at least one further element (6, 10, 11, 14) for the travel of the rolling stock (1) on the railway track and which can support, guide and/or supply the rolling stock (1). According to the invention, at least one (6) of the additional elements (6, 10, 11, 14) is directly integrated in the U-shaped element (3).

Abstract: This invention provides a novel construction method to longitudinally offset a traditional bridge substructure to a desired location by utilizing unconventional link-support or alternative support systems. This invention describes an approach to achieve longer span length, wider opening and/or greater lateral underclearance for the needed facility below a bridge span that no other traditional bridge construction methods could provide.

Abstract: A method of repairing, reinforcing or reinstating a bridge, comprising fixing a reinforcing plate in a spaced relationship with an existing plate or girder, especially on the underside of the bridge structure, to form a closed cavity, and injecting plastics or polymer material into said cavity in liquid form, whereby said plastics or polymer material sets or cures so as to bond to said reinforcing and existing plates with sufficient strength to transfer shear forces therebetween.

Abstract: A bridge system comprised of prefabricated deck units spaced along longitudinal load-carrying members. Tensioned structural elements are external to a plurality of the prefabricated deck units and produce longitudinal axial compression in these units. The tensioned structural elements can be deviated relative to the horizontal plane of the prefabricated deck units, subsequently enhancing the load-carrying capacity of the longitudinal load-carrying members. Leveling devices that permit relative motion between the longitudinal load-carrying members and the prefabricated deck units are provided. The leveling devices allow for the tensioned structural elements to provide longitudinal compression to the prefabricated deck units independent of the longitudinal load-carrying members.

Abstract: A construction method for a girder in a bridge which a plurality of piers are installed in an interval in a longitudinal direction of the bridge, a plurality of copings are installed on the piers, and a plurality of girders respectively installed between the piers are installed on the copings, the method comprising the steps of: installing at least one temporary girder on a front coping of the copings and a rear coping adjacent to the rear coping of the copings; installing a crane for pulling up a girder having a girder pulling up space therein guided by the temporary girder; providing with a girder by a pre-cast method so as to install a girder on the front coping and the rear coping; providing with a vehicle for carrying a girder, the vehicle being constituted so that load of a girder to the piers carried by the vehicle is distributed to the piers through the upper surface of the girders installed in advance; introducing the vehicle carrying a first girder moving along a guide of the temporary girder to a g

Abstract: One embodiment provides for a method of placing a structure in a generally horizontal position. The method includes constructing the structure in an essentially vertical position, the structure being defined by a first end. The structure is pivotably supported at a support location proximate the first end while the structure is in the essentially vertical position. The structure is then pivoted about the support location to move the structure from the essentially vertical position to the generally horizontal position.

Abstract: A system and method for construction of bridges and elevated roadways with pre-stressed concrete or steel bridge girders is provided including cast-in-place concrete deck slabs and partial and full depth pre-stressed pre-cast concrete deck slabs with post-tensioning conduits for post-tensioning a series of deck slabs. A plurality of bogies traveling on the lower flanges of the bridge girders are provided to place and level the deck slabs and to pre-load the bridge girders to eliminate camber before placement of the deck slabs on the bridge girders or to level, place, support and remove deck forms for a cast-in-place deck slab on the bridge girders. Also provided is a system for attachment of cast-in-place parapets.

Abstract: An apparatus, system, and method are disclosed for integrating the steps of securing and aligning a ramp to the pallet. A pallet mounting bracket secures to a pallet and mates with a corresponding ramp mounting bracket secured to a ramp. A pallet mounting bracket includes a registration receptacle that receives a registration member secured to the ramp mounting bracket in order to position the ramp with respect to the pallet. A driving member secured to the pallet mounting bracket engages a corresponding engagement portion on the ramp mounting bracket as the ramp is lowered into place next to the pallet. The driving member urges the engagement portion toward the pallet thereby urging a fastener secured to the ramp mounting bracket into engagement with a locking portion secured to the pallet mounting bracket thereby locking the ramp into position in alignment with the pallet.

Abstract: A modular pedestrian bridge (10) is disclosed. In its simplest form, the bridge (10) includes: a span module (12) having a tunnel (14) sufficient to allow pedestrians to travel through the tunnel (14), the tunnel (14) being defined by a floor (16) and a top (18), defining a height (20), sides (22) defining a width (24) and upper and lower connectors (26) and (28), a tower module (30), a stair assembly (32), the tunnel (14) having sufficient dimensions to allow the tower module (30) to be telescopically fit into the tunnel (14) and the span module (12) being adapted to fit on a chassis or flat bed truck of a vehicle. The bridge (10) is configured to simplify assembly and disassembly and is adapted to fit on a chassis, flat bed truck and the like. The span module (12) is dimensioned, such that it does not have special freight requirements, possibly triggering state and federal escort laws for extra wide or long loads.

Abstract: Passenger boarding bridges have adjustable walkways that are elevated high above the ground when servicing aircraft doorways. Passenger safety is improved by automatically stabilizing the passenger boarding bridge when it is in an aligned condition. A method for automatically stabilizing the passenger boarding bridge includes moving the aircraft-engaging end of the passenger boarding bridge into an aligned relationship relative to the doorway of an aircraft. The aligned relationship between the aircraft-engaging end of the passenger boarding bridge and the doorway of the aircraft is detected automatically. Adjustable jacks, which are fixedly mounted to the passenger boarding bridge wheel carriage, are actuated between a retracted condition and an extended condition. In the extended condition, the adjustable jacks engage a ground surface below the passenger boarding bridge, thereby increasing the stability of the passenger boarding bridge.

Abstract: A method for constructing a suspension bridge in places where it is not feasible to construct permanent earth anchorages land at either or both ends of the suspension bridge span is disclosed. The method of constructing the self-anchored suspension bridge comprises the use of preexisting permanent structures solely or in combination with minimum temporary structures to provide temporary anchor points for main suspension cables during construction. Once the suspension bridge span end structures are properly secured by a tensioning cable to the temporary structure or by a temporary connection to a permanent structure and the deck segment of pier table is lifted into place and tied down on an end support, the main suspension bridge cables are erected, suspenders are then erected from the main cable, and further construction of the bridge proceeds.

Abstract: A method of rebuilding a viaduct without interrupting service on the old structure by over topping it with a new, higher viaduct well above existing traffic, includes the following: Erecting new span supporting columns arrayed along either side of the old viaduct. New columns are temporarily connected to old viaduct to strengthen it for a temporary scaffold role transporting heavy subassemblies into position atop the new columns. The subassemblies or their components would typically arrive at a staging area alongside the old viaduct for preparation and hoisting the subassemblies onto a high dolly atop the old viaduct. The subassemblies are assembled into spans on the high dolly atop the old viaduct roadbed surface to transport and position the spans sequentially onto respective columns beginning with columns at extreme ends of the old viaduct and successively hoisting and transporting more subassemblies until a new higher viaduct roadbed is assembled well over the still functioning old viaduct.

Abstract: A bridge structure, comprising: a deck (1) for supporting a load thereon; first and second abutments (13a, b) which support respective ends of the deck and bear a compressive load from backfill (5) at the respective outer sides thereof; and at least one displacement compensation unit (21) which is configured such as to accommodate longitudinal displacement of the deck and maintain a predeterminable longitudinal force between the abutments, wherein the at least one displacement compensation unit has a load-displacement characteristic which provides for a reduced rate of change in the longitudinal force with longitudinal displacement of the deck as compared to a conventional bridge structure which incorporates no displacement compensation unit.

Abstract: A method and installation for constructing highways. The object is to extend operational capabilities of a mobile installation for constructing a highway in a space-limited environment without reducing the traffic intensity and construct the highway above an existing main traffic motorway. The method includes constructing the highway in the form of an elevated road passing at least by the part thereof over the existing motorway and also includes a portal type mobile self-propelled installation. The moveable legs of the installation are disposed within the land allocation of the existing motorway.

Abstract: Mobile bridge system with at least one bridge section comprising two articulatedly interconnected parts, and a bridge laying vehicle provided with a lifting frame hydraulically pivotable from the horizontal transportation position into a vertical laying position, carrying a lowering frame guiding a laying cable and pivotably resting on the vehicle. One part of the bridge section, during the transportation thereof, rests a downwardly directed roadway surface on the lifting frame and is locked thereto, while the other part of the bridge section during the transportation thereof rests with an upwardly directed roadway surface on the first part. A lowering frame is fixed to the lifting frame so as to be displaceable beyond its free end and the other part of the bridge section is provided in the vicinity of its free end with outwardly pivotably mounted, length-adjustable trestle legs.

Abstract: A construction method for simple bridges or continuous bridges using prestressed concrete girder (PSC girder) and precast slabs (PSC slabs) where prestress is applied to the lower portion of the center of the girder. bridges of low clearance and long span are constructed by preventing a loss of prestress due to load of the slabs and relieving excessive compression force generated on the upper edge portion of the center of the girder during the construction of the bridge.

Abstract: A method of using a cable to move a component underneath a bridge assembly. The bridge assembly includes an access area through which the connection between the component and the cable may be moved. The method includes connecting the component to the cable, using the cable to move the component below the bridge assembly, and alternating the connection points on the component when an obstruction of the access area through the bridge is encountered while moving the component. The method may also include installing a plurality of piles through the access area of the bridge assembly prior to moving the component below the bridge assembly.

Abstract: An improved box beam bridge and a method of construction are disclosed. The box beam bridge comprises a plurality of box beams for each lane structure of the bridge. Each of these lane structures are separately secured together and post-tensioned by means of a composite material strand. The separate lane structures are then brought together to complete the bridge width, with an interstitial box beam placed between the separate lane structures. Once arranged together, the separate lane structures and integrated interstitial box beam are secured together and post-tensioned by a second composite material strand that runs the entire width of the bridge.

Abstract: Disclosed is a modular bridge, typically for temporary use to enable persons to pass between upper floors of adjacent buildings during fire fighting or disaster relief operations, which can be rapidly assembled and deployed within a confined space and entirely from the “home” side of the gap to be crossed. It comprises a plurality of man-portable box section bridge modules adapted to be connected together end to end and projected in cantilever fashion from one side of the gap to the other. The assembly of modules is supported in and guided through a launch frame, with modules being added to the rear of the assembly and pushed through the frame until the gap is spanned. Removable lever arms of the frame are used to counterbalance the weight of the projected bridge modules during the course of deployment.

Abstract: Disclosed is a method of constructing partially earth-anchored cable-stayed bridges using a thermal prestressing technique, in which, when a steel girder-type partially earth-anchored cable-stayed bridge is built using a cantilever construction technique, the center of an intermediate span of the bridge is closed with a final key segment using a thermal prestressing technique, thus applying an initial axial tensile force to reinforcing girders of the bridge. To apply the initial axial tensile force to the reinforcing girders while the center of the intermediate span is closed with the final key segment, an appropriate space length required for closure of the final key segment is determined, and both the heating region and the heating temperature of the reinforcing girders according to the initial axial tensile force to be applied to the reinforcing girders during a process of manufacturing the final key segment are determined.

Abstract: The invention relates to a method and installation for constructing highways. The object of the invention is to extend operational capabilities of a mobile installation for constructing a highway in space-limited enviroment without reducing the traffic intensity and construct the highway above an existing main traffic motorway. The method of the present invention consists in constructing the highway in the form of an elevated road passing at least by the part thereof over the existing motorway and is characterized in that a portal type mobile self-propelled installation is used. The moveable legs of said installation are disposed within the land allocation of the existing motorway.

Abstract: An overhang bracket has a top member, a side member and a diagonal member. The side and top member may be connected together through a removable connecter. A guardrail post holder allows a guardrail post to be installed at a variety of angles to the top member. Rotating the side member causes the diagonal member to translate up or down the side member. A side member locator extends upwards from the overhang bracket to indicate the location of the side member. A tie rod holder holds a tie rod in an offset position relative to the side member. The side member locator may extend upwards through further parts of the shoring system or bridge overhang structure, for example a floor of a concrete form or rebar. A worker may adjust the overhang bracket in place from a standing position on a supporting structure or the floor of the form.

Abstract: A method and apparatus for adjusting the live and dead load balance between the arches of an arch bridge and the truss girder that supports the bridge deck. The method is achieved by providing a tension equalizing member across the bottom chord of the truss girder whose tension may be adjusted in cooperation with tension adjustments of hanger rods disposed between the arches and the bottom chords of the truss girder.

Abstract: A fiber reinforced polymer composite deck module is used to form a deck constructed by assembling the deck modules.

Abstract: A bridge is constructed using simply structured, longitudinal, modular deck sections or cells that are fabricated in a shop and shipped to the jobsite for quick assembly and erection. Each section has generally horizontal upper and lower members and at least one generally vertical member connected between the upper and lower horizontal members. The sections may be C-shaped, Z-shaped, or shallow U-shaped, and are connected in series. The upper and lower horizontal members of each section overlap respectively portions of the upper and lower horizontal members of the adjacent section to form overlapped regions. The connection sections define a plurality of closed cells. Open cells at the ends may be closed using appropriate end section(s) that may be shallow C-shaped or J-shaped. The sections are roll-formed or press braked from metal sheets or plates. The sections are connected together to form a multi-cell box girder bridge module by mating and welding or bolting the overlapped regions.

Abstract: A system and method for inserting pre-cast concrete pile caps under wooden railroad bridges without removing essential load bearing rails, cross-ties, and stringers is disclosed. The system and method minimizes the time that the track is closed to normal rail traffic. The system and method uses recycled oil well drill pipes that are cast into pile caps so that female-threaded ends are flushed with an upper surface of the pile caps. Lifting rods have male threaded ends that are used with a multi-point lifting device that allows the pile cap to be slipped under the existing bridge in a number of small incremental steps utilizing the spaces between wooden bridge stringers.

Abstract: The structural cable (2) to be anchored, such as a main suspension cable or a stay cable, is made of a compact bundle of parallel metallic wires. The cable wires are distributed into seven-wire units (18) in a portion of the cable adjacent to an anchor block (13), and these seven-wire units are individually anchored on the anchor block.

Abstract: A cable-stay cradle system (“cradle system”) for cable stayed bridges is mounted onto a cable stay, the opposite ends of which are attached to anchors on a bridge deck. The cradle system is disposed along the length of the cable stay and located in a pre-formed opening in a pylon. The cradle system includes axially spaced sleeve centering plates that have radially spaced holes through which the cable strands of the cable stay are threaded. The cradle system ensures that a distance from center-points of adjacent cable strands remains essentially constant along the entire length of the cradle system. The invention also provides a method of installing a cable stay including a cradle system, which includes the steps of threading the cable stay through the opening in the pylon so as to locate the cradle system in the opening, and attaching the cable stay to anchors on the bridge deck.

Abstract: A method of constructing a bridge including forming a concrete slab remote from the bridge, the slab having a side with at least one bolt hole therein, orienting the side of the concrete slab substantially parallel to the side of a girder so that the bolt hole of the concrete slab is aligned with a bolt hole in the side of the girder and connecting the bolt hole of the concrete slab with the bolt hole of the girder using a bracket and a pair of bolts.

Abstract: A collapsible bridge and laying method for a collapsible bridge where bridge girders are pushed over an obstacle by way of a laying beam positioned in front of the obstacle to be bridged. Rollers and roller carriers carrying the rollers are fastened to the bridge girders, the rollers running in rails arranged on the laying beam. During the laying operation, the rollers with the pertaining roller carrier leaving the rail of the laying beam are removed from the bridge girder and are mounted again at a different point of the bridge girder which is momentarily situated in front of the entry into the rail of the laying beam. This process of using and removing the rollers from the bridge girder is repeated during laying of the bridge. The bridge girder can include a plurality of detachably connectible bridge girder sections.

Abstract: A a pier system having at least one shelf beam which has a side panel and a shelf member, the shelf member supporting a decking unit, and a method for constructing the pier system. The decking unit may also be supported by connecting members, such as support bars or inverted trusses, which are attached to and span the distance between points on the shelf members of the shelf beams. Each shelf beam is coupled to at least one support post, and the support post may be connected to a sleeve that slides axially around the support post. The method involves constructing a pier frame out of at least two shelf beams and support posts, placing a decking unit upon the shelf members of the shelf beams, and extending the pier system by repeating the process and coupling successive pier frames to one another.

Abstract: A bridge is provided with at least five segments connected in series. Each segment includes two opposed ends. The ends of adjacent segments are in pivoting connection with respect to each other. The bridge also comprises a plurality of cables. For each end of each segment, at least one cable extends between the end of the segment and at least one end of at least one other segment. The cables have sufficient sizes, such that when the segments are pivoted to an orientation which forms an upwardly bowed arch, each of the cables extends in a substantially straight line between the ends of the segments. In addition, the segments on the ends of the bridge may be pivoted toward each other to provide slack in the cables, which enables the segments to pivot with respect to each other to form a compact configuration.

Abstract: A modular structure construction and repair system for use in new bridge construction and old bridge repair. The invention comprises a plurality of prefabricated modules which have a plurality of longitudinally extending beams and deck portions molded thereto. The modules are positioned over a plurality of girders so that longitudinal joints are formed above the girder. In the repair of an old bridge, an old section of the bridge deck is removed, and the modules are positioned on the existing girders. The modules are attached to the girders such that a shear connection is provided therebetween. Precompression may also be applied to clamp the sides of adjacent deck portions together. Various embodiments disclose this precompression and the shear connections.

Abstract: This invention relates generally to a drawbridge apparatus for reversibly spanning from a first base to a second base, and more particularly to a cantilever drawbridge with an initial vertical motion of the bridge deck then a sliding or horizontal-linear motion of the said bridge deck. The invention herein described effectively overcomes the problem of the adjacent first bridge approach obstructing the sliding movement of a sliding drawbridge. This is achieved by an initial vertical motion lifting the bridge deck until it effectively clears the first adjacent bridge approach thereby allowing the sliding the bridge deck to slide over said first adjacent bridge approach. A lifting mechanism and a sliding mechanism are included in the design to provide the apparatus the means to move the bridge deck vertically and horizontally.

Abstract: Arrangement for moving a heavy load wherein the arrangement includes at least one actuating unit. The at least one actuating unit utilizes a support for supporting the heavy load. A plurality of jacks are coupled to the support. A first movable element is adapted to slide within a channel of the support. The first movable element is movable in reciprocating manner. A second movable element is adapted to slide within the channel of the support. The second movable element slidably engages the first movable element and is movable in reciprocating manner. An actuating system is used for controlling sliding movements of the first and second movable elements. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.

Abstract: A method for constructing an underpass below a first section of a pre-existing first way where a first quantity of debris must be removed from an underpass space below the first section to form the underpass and enable passage of traffic along a second way. The method comprising the steps of providing foundation pairs on either side of the underpass space, each pair including first and second foundations on opposite sides of the first section, halting traffic along the first section, removing the first section, and removing at least a portion of the first quantity of debris from within the underpass space sufficient to enable installation of a superstructure substantially between the first and second foundation pairs and supported by the top ends of the first and second foundation pairs.

Abstract: A construction of a floor slab bridge includes a plurality of columnar H-shaped steels each disposed between adjacent bridge legs and arranged in side-by-side relation with an end face of a lower flange abutted with a corresponding end face of the adjacent columnar H-shaped steel. A lower concrete layer is formed by placing concrete in a space defined between the upper and lower flanges and between adjacent web plates through a concrete inlet port formed between the adjacent upper flange, and an upper concrete layer is formed by placing concrete on the upper flange. An iron reinforcement is horizontally disposed on the upper flanges, and an iron reinforcement is suspended in the space from the horizontal iron reinforcement through the concrete inlet port.

Abstract: A method and composition of matter for the encapsulation of the upper portion of a piling and header associated with a wharf, pier or the like, whereby this upper portion of the piling and header, while normally above the high tide mark, is often subjected to submergence due to climatic conditions and requires encapsulation by the composition of matter disclosed herein to prevent attack from marine microorganisms or marine borers.

Abstract: The invention relates to a method and installation for constructing an expressway, and to an expressway to be used as a duplicating road for existing urban or suburban motorways assigned for a heavy traffic.

Abstract: Disclosed is a construction method using plane lattice type cable structure. The plane lattice type cable structure is in the form of a wire net that main cables and hanger cables cross each other, and used in a long span bridge, a steel-framed multi-stage building, a large-sized shell structure and large-sized transmission towers. The plane lattice type cable structure can be installed to the bridge without installing main towers, installed to the steel-framed multi-stage building without installing interior pillars, and installed to the shell structure without installing supporting pillars for supporting the shell structure. Additionally, in case of the large-sized transmission towers, instead of the large-sized transmission towers, a plurality of small-sized transmission pillars can be used.

Abstract: A bridge platform and method of erecting the same wherein a plurality of cables extend longitudinally of the bridge in spaced relation below the deck or roadway and steel support structure of the bridge, which cables are supported at opposite ends by the spaced-apart vertical piers of the bridge, and wherein a plurality of platform flooring panels or sections are supported on the cables, extend laterally of the bridge, are arranged side-by-side along the length of the bridge between the piers and are removably secured to the cables. The cables are attached to the bridge piers by compression clamp structures. The platform flooring sections comprise elongated rectangular corrugated decking panels and are arranged in end-to-end overlapping relation transversely of the bridge, side-to-side overlapping relation longitudinally along the bridge and with the corrugations extending transversely of the cables.

Abstract: A prestressed concrete girder having an adjustable load bearing capacity includes a concrete girder including an upper flange, and at least one non-attached steel wire installed in the upper flange of the girder and extending in a lengthwise direction of the girder. A method of adjusting a load bearing capacity of a bridge using a prestressed concrete girder having an adjustable load bearing capacity including non-attached steel wires capable of being cut at an upper flange is also disclosed.

Abstract: A collapsible bridge and laying method for a collapsible bridge is provided where bridge girders are pushed over an obstacle by way of a laying beam positioned in front of the obstacle to be bridged. Rollers and roller carriers carrying the rollers are fastened to the bridge girders, the rollers running in rails arranged on the laying beam. During the laying operation, the rollers with the pertaining roller carrier leaving the rail of the laying beam are removed from the bridge girder and are mounted again at a different point of the bridge girder which is momentarily situated in front of the entry into the rail of the laying beam. This process of using and removing the rollers from the bridge girder is repeated during laying of the bridge. The bridge girder can include a plurality of detachably connectible bridge girder sections.

Abstract: A method of modifying the vertical profile of a cable supported bridge. The method consists of sequentially adjusting a lower end of a series of supporting cables downward relative to the bridge superstructure and sequentially adjusting an attachment structure associated with the lower end of each cable to maintain the distance each cable has been adjusted. The adjustments preferably proceeds according to a pre-specified plan known as an adjustment sequence. The preparation of an adjustment sequence according to the methods disclosed allows the modification of the vertical profile of the bridge superstructure to be completed without overstressing any bridge members, and with predictable results.

Abstract: A method of constructing an elevated roadway, utilizing a crane having an articulated boom arm and a gripping mechanism, at the end of the arm for gripping a pylon, below a roadway cradle of the pylon, in order to temporarily transfer loads, generated by a tramway moving a precast bridge section along the crane arm and onto a pair of cradles, mounted upon the pylons. The construction method permits the crane to be positioned on an assembled portion of the elevated roadway, while constructing the remaining portion of the elevated roadway.

Abstract: A construction of a floor slab bridge includes a plurality of columnar H-shaped steels each disposed between adjacent bridge legs and arranged in side-by-side relation with an end face of a lower flange abutted with a corresponding end face of the adjacent columnar H-shaped steel. A lower concrete layer is formed by placing concrete in a space defined between the upper and lower flanges and between adjacent web plates through a concrete inlet port formed between the adjacent upper flange, and an upper concrete layer is formed by placing concrete on the upper flange. An iron reinforcement is horizontally disposed on the upper flanges, and an iron reinforcement is suspended in the space from the horizontal iron reinforcement through the concrete inlet port.