CN112160256A - Transverse integral reinforcing construction method for bridge - Google Patents
Transverse integral reinforcing construction method for bridge Download PDFInfo
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- CN112160256A CN112160256A CN202010767162.3A CN202010767162A CN112160256A CN 112160256 A CN112160256 A CN 112160256A CN 202010767162 A CN202010767162 A CN 202010767162A CN 112160256 A CN112160256 A CN 112160256A
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- bridge
- chord member
- web
- upper chord
- lower chord
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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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
- E01D6/00—Truss-type bridges
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a transverse integral reinforcing construction method for a bridge, which comprises the following steps: 1) prefabricating an upper chord member, a lower chord member and a first web member; 2) a hole is arranged on a bridge deck of the existing bridge body; 3) installing an upper chord on the bridge deck; 4) mounting a lower chord to be tightly attached to the bottom surface of the prefabricated small box girder; 5) mounting a first web member to enable the first web member to be tightly attached to the outer side surface of the prefabricated small box girder; 6) the positions of the upper chord member, the lower chord member and the first web member are accurately adjusted, and the joints of the upper chord member, the lower chord member and the first web member are welded; 7) the upper chord member and the lower chord member are fixedly connected with the existing bridge body through drilling and bolt embedding; 8) and finishing the holes of the bridge deck to finish the restoration of the bridge deck. The steel truss is adopted to effectively connect the small box girders into a whole in the transverse bridge direction, so that the transverse integral rigidity of the bridge can be effectively improved, the dead weight is light, the clearance under the bridge is basically not influenced, the construction is convenient and efficient, the construction quality is easy to guarantee, the construction investment is less, and the influence on the surrounding environment is less compared with a concrete diaphragm girder and the like.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a transverse integral reinforcement construction method for a bridge.
Background
With the rapid development of the transportation industry in China, the traffic flow of road vehicles increases year by year, and the overload and transfinite transportation condition is more and more severe. The load standard adopted by the bridge designed in the early stage is low, the load of an actual transport vehicle exceeds the design load, and diseases of different types and different degrees occur after a plurality of bridges are operated for a long time, so that the normal operation and the structure safety of the bridge are seriously influenced.
The assembled small box girder bridge is popularized nationwide from the 90 s of the 20 th century, is widely applied to the fields of highways and municipal administration, has certain economic and technical advantages, and has the defects of weak transverse connection, poor structural integrity and the like compared with a single-chamber or multi-chamber integral box girder.
Under the action of a large-tonnage overloaded vehicle, some assembled small box girder bridges cannot form effective restraint in the transverse direction due to the fact that no diaphragm girder is arranged or the number of the diaphragm girders is insufficient, so that the load of the vehicle borne by a single girder is large, each small box girder cannot deform in a coordinated mode, obvious relative displacement and torsion occur, a transverse bending phenomenon is formed, and the cracking of a girder body structure and a wet joint is caused. With the continuous traffic load, cracks and other diseases are continuously developed, so that the problems of serious insufficient rigidity and durability of the bridge structure are caused.
Disclosure of Invention
The invention aims to solve the problems of poor transverse connection and poor structural integrity of the existing assembled small box girder bridge, which cause serious defects of structural rigidity and durability of the bridge.
Therefore, the invention provides a transverse integral reinforcing construction method for a bridge, which comprises the following steps:
1) prefabricating an upper chord member, a lower chord member and a first web member for forming a steel truss;
2) the method comprises the following steps that holes are formed in a bridge deck of an existing bridge body and located on two sides of a prefabricated small box girder transverse bridge of the existing bridge body;
3) the upper chord member is hung and placed to a designed position on a bridge deck of the existing bridge body by using a crane, and is usually arranged along the transverse bridge direction and temporarily reinforced;
4) hoisting the lower chord member to a construction platform below the existing bridge body by using a crane, arranging a counter-force hoisting frame at the hole of the bridge deck, and hoisting the lower chord member to the installation position by using a hoist crane or a winch so as to enable the lower chord member to be tightly attached to the bottom surface of the prefabricated small box girder of the existing bridge body;
5) the method comprises the following steps that a first web member and a gusset plate used for connecting a lower chord member are connected in a pre-splicing mode through high-strength bolts, the first web member is freely placed down from a hole of a bridge deck plate through a counter-force hanging bracket and is tightly attached to the outer surface of a prefabricated small box girder web plate, holes are formed in the positions, corresponding to the upper chord member and the lower chord member, of the upper web member in a positioning mode, the upper end of the first web member penetrates through the hole of the bridge deck plate and is temporarily fixed with the upper chord member through the high-strength bolts, and the gusset plate and the lower chord member which are pre-spliced with the first web member are temporarily;
6) the positions of the upper chord member, the lower chord member and the first web member are accurately adjusted, and then the joints of the components are welded;
7) drilling holes on the upper surface and the bottom surface of the existing bridge body, and embedding bolts, and connecting and fixing the upper chord member and the lower chord member with the existing bridge body, so that the fixed connection of the steel truss and the existing bridge body is completed;
8) and finishing the holes of the bridge deck to finish the restoration of the bridge deck.
Further, the steel truss prefabricated in the step 1) further comprises a second web member, and the second web member is connected with the prefabricated upper chord member in a pre-splicing mode through a high-strength bolt; when the upper chord is hoisted in the step 3), the pre-spliced upper chord and the second web members are hoisted to the designed position together, the second web members freely penetrate through the bridge deck from the holes on the bridge deck, meanwhile, the lower chord is installed, the lower ends of the second web members are temporarily fixed with the lower chord through the gusset plates by utilizing high-strength bolts, and the upper chord and the lower chord are welded and fixed after the position is accurately adjusted.
Furthermore, when the second web members are installed, two second web members are arranged between two adjacent prefabricated small box girders in the transverse bridge direction, the lower ends of the two second web members share one gusset plate, and the upper ends of the two second web members respectively extend upwards towards the two prefabricated small box girders in an inclined mode and penetrate through the holes of the bridge deck to be connected with the upper chord members.
Furthermore, after the first web member and the second web member are accurately adjusted in position, the connecting parts of the first web member and the upper chord member and the connecting parts of the second web member and the upper chord member and the lower chord member are welded firstly, and then the connecting parts of the second web member and the upper chord member and the connecting parts of the second web member and the lower chord member are welded.
Further, before the bridge deck is provided with the holes in the step 2), the concrete pavement layer of the bridge deck is broken, the panel layer of the bridge deck is remained, the upper chord is laid on the panel layer, and the panel layer is provided with the holes; and after the steel truss is fixedly connected with the existing bridge body, finishing holes in the panel layer, and completing the recovery of the concrete pavement layer of the bridge deck.
Furthermore, when the concrete pavement layer is restored, a double-layer reinforcing mesh is paved in the bridge deck slab, and the lower reinforcing mesh is connected with the upper chord rods in an inserting manner.
Further, after the joints of the upper chord member, the lower chord member and the first web member are welded in the step 6), stiffening ribs and lacing bars are welded on the upper chord member, the lower chord member and the first web member.
Further, after the step 7) of fixedly connecting the steel truss with the existing bridge body is completed, glue is filled and sealed between the upper chord member, the lower chord member, the first web member and the surface of the existing bridge body.
And further, performing anticorrosive coating on each component of the steel truss and the connection part between the components.
Compared with the prior art, the invention has the beneficial effects that:
(1) the construction method for transversely and integrally reinforcing the bridge provided by the invention has the advantages that the existing assembled small box girders are transversely and integrally reinforced by adopting the steel truss in the bridge span, and the small box girders are effectively connected into a whole in the transverse bridge direction, so that the transverse integral rigidity of the bridge can be effectively improved, the dead weight is light, the clearance under the bridge is not basically influenced, the construction is convenient and efficient, the construction quality is easy to guarantee, the construction investment is less, and the influence on the surrounding environment is small.
(2) The construction method for transversely and integrally reinforcing the bridge is based on an assembly type installation construction idea, and each component of the steel truss can be manufactured and pre-spliced in a factory manner, and the size of the steel truss is adjusted according to the actual form of the bridge; the single-piece or assembly type hoisting device is adopted to hoist at the bridge position, and all the components are mutually connected in a bolt and welding combination mode and are closely attached and fastened with the beam body structure, so that the aim of effectively and transversely reinforcing the bridge structure integrally is fulfilled, and the construction efficiency is improved.
(3) The transverse integral reinforcing construction method for the bridge is suitable for reinforcing and reforming construction of the existing small assembled box girder bridge in the fields of highways and municipal administration, and meanwhile, reference can be provided for maintenance and reinforcing construction of the existing prefabricated assembled girder bridge in the forms of hollow slab girders, T girders and the like.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the connection between a steel truss and an existing bridge body in the construction method for transverse integral reinforcement of a bridge according to the present invention;
FIG. 2 is a schematic view of the opening of the bridge deck and the breaking of the concrete pavement according to the present invention;
FIG. 3 is a schematic view of the upper chord and web members of the present invention;
FIG. 4 is a schematic view of the lower chord installation of the present invention;
FIG. 5 is a schematic view of the connection and fixation of the steel truss members according to the present invention;
fig. 6 is a schematic view illustrating the restoration of the concrete pavement layer of the bridge deck according to the present invention.
Description of reference numerals: 1. a bridge deck; 2. prefabricating a small box girder; 3. an upper chord; 4. a first web member; 5. a second web member; 6. a lower chord; 7. a gusset plate; 8. implanting a suppository; 9. a panel layer; 10. a hole; 11. a concrete pavement layer; 12. a construction platform; 13. hoisting a machine; 14. a counter-force hanger.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The embodiment provides a construction method for transversely and integrally reinforcing a bridge, which specifically comprises the following steps:
1. preparation before construction
(1) Technical preparation: compiling a special construction scheme for manufacturing and installing the steel truss, and carrying out submission and technical background-meeting work; checking and measuring the size, shape and the like of a mid-span area of a full-bridge body of the existing bridge body, particularly the height difference and the flatness of a bottom plate and a web plate; measuring and recording the full-bridge deck elevation of the existing bridge body so as to facilitate later recovery; paying off the midspan position of the existing bridge body to the position of an anti-collision retaining wall of the bridge floor to prepare for positioning the steel truss beam; and (3) carrying out steel structure raw material detection, compiling a welding process scheme and a coating process scheme, carrying out corresponding process tests and the like.
(2) Preparing for on-site production: compiling a temporary traffic organization scheme and reporting, and carrying out traffic dismissal, closure, safety protection and the like on a construction site; leveling the field under the bridge, and erecting a floor scaffold or a hanging construction platform 12 according to the actual situation of the field; in a proper area of a bridge deck (after a concrete pavement layer is broken), temporary storage sites of construction materials such as all components of the steel truss are appointed, functional partitions are made, and all the components of the steel truss are stored in a classified partition mode according to types, construction sequences and the like; reasonably organizing the entering of operating personnel and equipment (devices) such as truck cranes, counter-force hangers and the like, and comprehensively arranging the personnel under and on the bridge and the bridge deck construction equipment.
(3) Before the steel truss is installed, the surface of a midspan area of an existing bridge body is repaired and cleaned: carrying out surface cleaning work on the concrete surfaces outside the bottom plate and the web plate of the prefabricated small box girder 2, and repairing and treating diseases such as concrete damage, exposed corrosion of reinforcing steel bars and the like; and (3) treating the cracks existing on the surface of the existing bridge body by adopting a crack sealing or pressure glue injection method according to the sizes of the cracks.
2. Breaking of concrete pavement layer on bridge deck slab and opening of bridge deck slab
As shown in fig. 2, in order to achieve a better reinforcing effect and reduce an existing dead load when reinforcing an existing bridge body, a concrete pavement 11 such as an asphalt surface layer or a concrete leveling layer is removed before reinforcing a steel truss. The asphalt surface layer is broken by a milling machine, the concrete leveling layer adopts a mode of splitting by a splitter, cutting by a joint cutter, chiseling by an air pick and shoveling by manual cooperation, and the asphalt surface layer can also adopt a breaking method of the concrete leveling layer for avoiding the adverse effect of large-scale breaking and breaking equipment on a bridge structure. When breaking the operation to concrete pavement layer 11, the construction operation is broken on bridge face concrete pavement layer 11 to the unified deployment of full-bridge, and the broken thing of bridge floor is in time cleared up the outward transport, and panel layer 9 that exposes will clean up totally, provides the working face for follow-up construction.
The steel truss is an integral structure formed by connecting all components in a closed manner, and each web member connected with the node of the upper chord 3 needs to penetrate through the bridge deck 1 to be connected with the upper chord 3, so that a hole 10 for the web member of the steel truss to penetrate through needs to be formed in the corresponding position of the bridge deck 1. In the process, in order to ensure the safety and the integrity of the bridge structure, the structure is not damaged as much as possible during the hole opening, the hole opening position at the lofting position is accurately set before construction, and the hole opening adopts a mode of cutting by a cutting machine and breaking by an artificial pneumatic pick; when the hole is opened, the steel bar structure (the steel truss web member can pass through) is reserved as much as possible, and the slag in the hole 10 is cleaned; the number, size and position of the holes are ensured to meet the requirements of hoisting and welding the steel truss. During the drilling process, attention needs to be paid to the protection of the concrete structure of the adjacent non-drilled area, and the phenomena of cracking, breakage, collapse and the like are prevented.
3. Processing, manufacturing and transporting of each component of steel truss
Before the steel truss is manufactured, the data such as the size, the distance and the like of the main beam of the existing bridge body are accurately measured, the size of a steel truss design drawing is adjusted and optimized according to actual measurement data, and guidance is provided for steel member blanking construction.
The welding between the components of the steel truss is divided into factory welding and field welding. Before formal welding, a welding process evaluation test is carried out, reasonable welding processes and parameters are determined, the welding deformation rule of a member is researched, effective measures for controlling welding deformation are formulated, and the influence of the welding deformation on a rod piece is controlled to be in a minimum state, such as: and welding the gusset plate and the lower chord member and the like.
When the components of the steel truss are subjected to hole making and pre-splicing, a special jig frame is required to be arranged so as to ensure the processing precision; the lower chord 6 takes the actual position of the bolt 8 as the standard to make holes on site; the steel bar penetrating holes of the upper chord members 3 and the bolt holes of the web members are manufactured in factories; and all the components are in a free state during pre-assembly, and are positioned by paying off according to a real sample, so that the integral assembly precision of the steel truss is ensured.
In order to better adapt to the actual size error of the beam body and ensure the on-site assembly quality of the steel truss, the first web member 4 tightly attached to the prefabricated small box girder 2 and the bolt holes at the connecting parts of the upper chord member and the lower chord member are drilled on site, and the corresponding gusset plates can be welded on site.
After the manufactured steel members are qualified through inspection, transporting the steel members to a bridge floor or other specified positions in batches for storage; during transportation and storage, safety protection measures are set according to corresponding regulations to prevent damage, deformation, rain or water soaking and the like.
4. Mounting of top chord and web members
As shown in fig. 3, firstly, the mounting position of the upper chord 3 on the top surface of the existing bridge body is measured in detail according to a design drawing; and then, pre-assembling the prefabricated upper chord 3 and the second web members 5 on the bridge deck 1 of the existing bridge body by using high-strength bolts, hoisting the pre-assembled upper chord 3 and the pre-assembled second web members 5 to a set position by using a crane 13 and temporarily fixing the pre-assembled upper chord 3 and the pre-assembled second web members 5, and enabling the second web members 5 to freely penetrate through the bridge deck 1 from the holes 10 on the bridge deck 1.
5. Mounting of lower chords
As shown in fig. 4, firstly, the mounting position of the lower chord 6 on the bottom surface of the existing bridge body is measured in detail according to the design drawing, and measures should be taken to fill up and finish the problems (if any) such as height difference and uneven surface existing on the bottom surface of the existing bridge body before mounting, so as to ensure that the lower chord 6 can be closely attached to the bottom surface of the existing bridge body. Then, the prefabricated lower chord 6 is hung and placed on a construction platform 12 below the existing bridge body by using a crane 13, a counter-force hanging bracket 14 is arranged at the hole 10 of the bridge deck 1, and the lower chord 6 is lifted to the installation position by a hoist crane or a winch so as to be tightly attached to the bottom surface of the prefabricated small box girder 2 of the existing bridge body. Finally, the first web members 4 and the gusset plates 7 used for being connected with the lower chord members 6 are connected in a pre-splicing mode through high-strength bolts, the first web members 4 are freely placed down from the holes 10 of the bridge deck slab 1 through the counterforce hanging frames 14 and are attached to the outer surface of the web plate of the prefabricated small box girder 2, holes are formed in the positions, corresponding to the upper chord members 3 and the lower chord members 6, of the upper ends of the first web members 4 and the upper chord members 3 are temporarily fixed through the high-strength bolts, and the gusset plates 7 pre-spliced with the first web members 4 and the lower ends of the second web members 5 and the lower chord members 6 are temporarily fixed through the high-strength bolts.
6. Connection and fixation of each component of steel truss
As shown in fig. 5, after the components of the steel truss are installed in place, the positions of the upper chord 3, the lower chord 6 and the web members are accurately adjusted to ensure that the assembly and connection can be smoothly completed; then, the high-strength bolts connected with the web members and the upper and lower chords are initially screwed, then the joints are welded, the high-strength bolts are finally screwed after welding, and finally the corresponding stiffening ribs, lacing bars and the like are welded. In the welding process, the connecting parts of the first web members 4 and the upper and lower chord members are welded, and then the connecting parts of the second web members 5 and the upper and lower chord members are welded. For the fixation of the upper chord 3 and the lower chord 6, the upper chord 3 and the lower chord 6 are reliably connected and fixed with the existing bridge body by drilling the embedded bolts 8 on the top surface and the bottom surface of the existing bridge body.
7. Glue injection sealing and anticorrosive coating
After the steel truss is connected and fixed, the upper chord 3, the lower chord 6, the first web member 4, the second web member 5 and the surface of the existing bridge body are filled with glue and sealed, and the mutual close combination of the upper chord 3, the lower chord 6, the first web member 4 and the second web member is ensured.
Optimally, in order to prolong the service life of the steel truss, each component of the steel truss can be subjected to anticorrosive coating; specifically, the anticorrosive coating is carried out in two parts of a factory and a site. Most of the components (except the upper chord member) of the steel truss can be coated according to the requirements in a factory, the site coating is carried out on the local site hole making part, the bolt connecting part, the welding part, the damaged part and the like, and the inspection and acceptance are carried out in time after the coating is finished.
8. Bridge deck opening recovery and concrete pavement layer recovery
As shown in fig. 6, after the steel truss is connected and fixed, firstly, operations such as steel bar trimming, connection, formwork hanging and erecting are performed on the open hole of the bridge deck 1, and preparation is made for restoring the open hole of the bridge deck 1; then, the bridge deck slab 1 is embedded with bars, a double-layer reinforcing mesh is laid and the like as required, and when the lower layer reinforcing mesh is laid, the lower layer reinforcing mesh is connected with the upper chord 3 of the steel truss in an inserting way; and finally, constructing the bridge deck concrete and the asphalt surface layer to finish the recovery of the concrete pavement layer 11 on the bridge deck 1.
The transverse integral reinforcing structure of the bridge, which is obtained by constructing the existing bridge body by adopting the transverse integral reinforcing construction method of the bridge, comprises the existing bridge body and a steel truss arranged in the span of the existing bridge body as shown in figure 1; the existing bridge body comprises a prefabricated small box girder 2 and a bridge deck 1 arranged on the prefabricated small box girder 2, the prefabricated small box girder 2 is provided with two or more transverse bridges, the steel truss comprises an upper chord 3, a lower chord 6 and a first web member 4, the upper chord 3 is arranged on the bridge deck 1 along the transverse bridge direction, the lower chord 6 is arranged on the bottom surface of the prefabricated small box girder 2 along the transverse bridge direction, the web outer surface of the prefabricated small box girder 2 attached to the first web member 4 is arranged, the upper end of the first web member 4 is connected with the upper chord 3 in a penetrating mode, the lower end of the first web member 4 is connected with the lower chord 6, and therefore all components of the steel truss realize fastening and clamping on the basis of forming a steel truss structure to the existing bridge body structure. In the embodiment, the steel truss type cross beam is arranged in the span of the existing bridge body, the height of the steel truss is equivalent to that of the prefabricated small box girders 2, the steel truss is light in weight and high in rigidity, and the prefabricated small box girders 2 can be effectively connected in the transverse bridge direction to form a whole on the premise of increasing less constant load of the bridge, so that the transverse connection among the prefabricated small box girders 2 is increased, the transverse distribution coefficient of live load of an automobile is improved, the integral synergetic stress deformation of the bridge structure is ensured, and the adverse effect of single girder bearing is overcome; compared with a concrete diaphragm beam and the like, the transverse integral rigidity of the bridge can be effectively improved, the under-bridge clearance is not influenced basically, the construction is convenient and efficient, the construction quality is easy to guarantee, the construction investment is less, and the influence on the surrounding environment is small.
Further, the steel truss still includes a plurality of second web member 5, and the cross bridge is provided with two second web members 5 to between two adjacent prefabricated little case roof beams 2, and these two 5 lower extremes of second web member are connected with lower chord 6, and its upper end upwards extends to two prefabricated little case roof beams 2 slopes respectively to run through decking 1 and be connected with upper chord 3, has further improved this steel truss's bulk rigidity through setting up of second web member 5. Specifically, the lower ends of two second web members 5 between two adjacent small prefabricated box girders 2 share one gusset plate 7 to be connected with the lower chord 6, and the gusset plate 7 is positioned in the middle of the lower chord 6 between the two adjacent small prefabricated box girders 2, so that the uniformity of stress distribution is ensured.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (9)
1. The transverse integral reinforcing construction method for the bridge is characterized by comprising the following steps:
1) prefabricating an upper chord member, a lower chord member and a first web member for forming a steel truss;
2) the method comprises the following steps that holes are formed in a bridge deck of an existing bridge body and located on two sides of a prefabricated small box girder transverse bridge of the existing bridge body;
3) the upper chord member is hung and placed to a designed position on a bridge deck of the existing bridge body by using a crane, and is usually arranged along the transverse bridge direction and temporarily reinforced;
4) hoisting the lower chord member to a construction platform below the existing bridge body by using a crane, arranging a counter-force hoisting frame at the hole of the bridge deck, and hoisting the lower chord member to the installation position by using a hoist crane or a winch so as to enable the lower chord member to be tightly attached to the bottom surface of the prefabricated small box girder of the existing bridge body;
5) the method comprises the following steps that a first web member and a gusset plate used for connecting a lower chord member are connected in a pre-splicing mode through high-strength bolts, the first web member is freely placed down from a hole of a bridge deck plate through a counter-force hanging bracket and is tightly attached to the outer surface of a prefabricated small box girder web plate, holes are formed in the positions, corresponding to the upper chord member and the lower chord member, of the upper web member in a positioning mode, the upper end of the first web member penetrates through the hole of the bridge deck plate and is temporarily fixed with the upper chord member through the high-strength bolts, and the gusset plate and the lower chord member which are pre-spliced with the first web member are temporarily;
6) the positions of the upper chord member, the lower chord member and the first web member are accurately adjusted, and then the joints of the components are welded;
7) drilling holes on the upper surface and the bottom surface of the existing bridge body, and embedding bolts, and connecting and fixing the upper chord member and the lower chord member with the existing bridge body, so that the fixed connection of the steel truss and the existing bridge body is completed;
8) and finishing the holes of the bridge deck to finish the restoration of the bridge deck.
2. The transverse integral reinforcement construction method for the bridge according to claim 1, wherein the steel truss prefabricated in the step 1) further comprises second web members, and the second web members are connected with the prefabricated upper chord members in a pre-splicing manner by high-strength bolts; when the upper chord is hoisted in the step 3), the pre-spliced upper chord and the second web members are hoisted to the designed position together, the second web members freely penetrate through the bridge deck from the holes on the bridge deck, meanwhile, the lower chord is installed, the lower ends of the second web members are temporarily fixed with the lower chord through the gusset plates by utilizing high-strength bolts, and the upper chord and the lower chord are welded and fixed after the position is accurately adjusted.
3. The transverse integral reinforcement construction method for the bridge according to claim 2, wherein when the second web members are installed, two second web members are arranged between two adjacent prefabricated small box girders in the transverse bridge direction, the lower ends of the two second web members share a node plate, and the upper ends of the two second web members extend obliquely upwards towards the two prefabricated small box girders respectively and penetrate through the holes of the bridge deck to be connected with the upper chord members.
4. The method for constructing the transverse integral reinforcement of the bridge according to claim 2, wherein the first web member and the second web member are welded to the upper chord member and the lower chord member after the precise adjustment of the positions of the first web member and the second web member, and then the second web member is welded to the upper chord member and the lower chord member.
5. The transverse integral reinforcement construction method for the bridge according to claim 1, wherein in the step 2), before the opening is made on the bridge deck, the concrete pavement layer of the bridge deck is broken, the deck layer of the bridge deck is remained, the upper chord is laid on the deck layer, and the opening is made on the deck layer; and after the steel truss is fixedly connected with the existing bridge body, finishing holes in the panel layer, and completing the recovery of the concrete pavement layer of the bridge deck.
6. The method for constructing the transverse integral reinforcement of the bridge according to claim 5, wherein the double-layered reinforcing mat is laid in the bridge deck and the lower reinforcing mat is inserted into the upper chord member when the concrete pavement is restored.
7. The method for constructing the transverse integral reinforcement of the bridge according to claim 1, wherein the step 6) welds the joints of the upper chord member, the lower chord member and the first web member, and then welds the stiffening ribs and the lacing bars on the upper chord member, the lower chord member and the first web member.
8. The transverse integral reinforcement construction method for the bridge according to claim 1, wherein after the step 7) of fixedly connecting the steel truss with the existing bridge body, glue is filled and the edges are sealed between the upper chord member, the lower chord member, the first web members and the surface of the existing bridge body.
9. The transverse integral reinforcement construction method for the bridge according to claim 1, wherein the components of the steel truss and the joints among the components are coated with an anti-corrosion coating.
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