CN115928558A - Transverse joint structure of UHPC combined box girder and construction method thereof - Google Patents
Transverse joint structure of UHPC combined box girder and construction method thereof Download PDFInfo
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- CN115928558A CN115928558A CN202310142201.4A CN202310142201A CN115928558A CN 115928558 A CN115928558 A CN 115928558A CN 202310142201 A CN202310142201 A CN 202310142201A CN 115928558 A CN115928558 A CN 115928558A
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Abstract
The invention discloses a transverse joint structure of a UHPC combined box girder and a construction method thereof, and the transverse joint structure comprises a first prefabricated UHPC combined box girder, a second prefabricated UHPC combined box girder and a cast-in-place transverse UHPC joint structure, wherein the first UHPC combined box girder and the second UHPC combined box girder respectively comprise a UHPC box-type outer shell and an inner steel core, the UHPC box-type outer shell comprises a top plate, the inner steel core comprises an exposed support plate, the support plate of the first UHPC combined box girder is butted with the support plate of the second UHPC combined box girder and forms a UHPC-type pouring space with an upper opening by enclosing with the top plate of the first UHPC combined box girder and the top plate of the second UHPC combined box girder, and the transverse UHPC joint structure is cast in place in the recessed pouring space. The UHPC combined box girder transverse joint structure has the advantages of convenient construction and low risk of cracking at the joint of the box girder.
Description
Technical Field
The invention relates to the field of bridges, in particular to a transverse joint structure of a UHPC combined box girder and a construction method thereof.
Background
The multi-span continuous box girder bridge adopting the assembly construction mainly comprises a Prestressed Concrete (PC) girder bridge, a steel girder bridge and a steel-concrete combined girder bridge, and the field operation amount can be reduced through the whole-hole prefabricating and hoisting construction. The prestressed concrete box girder bridge is quick in construction and good in economic performance, but for a large-span bridge, the large-span bridge still faces the technical problems of large self weight, heavy whole-hole hoisting burden and the like, and the joint structure of the pier top hogging moment area is complex by a generally adopted continuous construction method of simply supporting and then structure. The steel box girder bridge has light dead weight, easy hoisting and large span, but the steel beam welding and assembling are complex, the cost is high, and the technical problems of orthotropic steel bridge deck fatigue cracking, asphalt pavement damage and the like generally exist. The steel-concrete combined box girder bridge has unique advantages due to the combination of the characteristics of two materials, and has wide application prospect. The Ultra-High Performance Concrete (UHPC, hereinafter referred to as UHPC) has excellent mechanical properties and durability, and has good application value in bridges with large span, light weight, heavy corrosion and the like. The UHPC bridge has the advantages that creep coefficient and later-period shrinkage can be remarkably reduced through high-temperature curing, the structural quality can be further ensured through factory prefabrication, the construction speed is high, meanwhile, due to the ultrahigh mechanical property of the UHPC, the cross section size of the UHPC bridge is smaller than that of a conventional PC Liang Geng, the self weight is lighter, and the transportation and hoisting are convenient, so that the UHPC bridge structure has remarkable technical advantages when being applied to a multi-span continuous box girder bridge.
Patent (ZL 201110345089.1) has proposed a continuous case roof beam structure of prestressing force UHPC based on UHPC material, but the inside intensive UHPC horizontal separators that sets up of this structure, the inside template of case roof beam is separated disconnection by the separation in horizontal separator department for case roof beam work progress is loaded down with trivial details, and the centre form is comparatively difficult when the drawing of patterns.
The multi-span continuous box girder bridge constructed in an assembling way generally adopts a construction method of prefabricating a whole hole, continuously hoisting a bridge deck or continuously constructing a full-section structure, so that a transverse joint in a hogging moment area of a middle pier top becomes a key of full-bridge stress. The bridge deck continuous structure erecting formwork is simple, construction is convenient, but the rigidity of the joint is small, the problem of overlarge longitudinal tensile stress is easy to occur, and then the problems that the area is easy to crack, leak water and the like are caused, further steel bars are induced to rust, and the durability of the structure is influenced. The continuous structure of the full-section structure has high rigidity, and can effectively reduce the tensile stress at the joint, but the templates at the joint need to be arranged along the full height of the section, the templates are difficult to erect, the prestress needs to be tensioned, and the construction process is complicated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a transverse joint structure of a UHPC combined box girder and a construction method thereof, wherein the transverse joint structure is convenient to construct and low in risk of cracking at a joint of the box girder.
In order to solve the technical problems, the invention adopts the following technical scheme:
a transverse joint structure of a UHPC combined box girder comprises a first UHPC combined box girder, a second UHPC combined box girder and a transverse UHPC joint structure cast between the first UHPC combined box girder and the second UHPC combined box girder in a cast-in-place mode, wherein each of the first UHPC combined box girder and the second UHPC combined box girder comprises a UHPC box-type shell and an inner steel core attached and fixed to the inner wall of the UHPC box-type shell, each UHPC box-type shell comprises a top plate, each inner steel core comprises an exposed support plate, the support plates of the first UHPC combined box girder are in butt joint with the support plates of the second UHPC combined box girder and form a recessed casting space with an upper opening in a surrounding mode with the top plate of the first UHPC combined box girder and the top plate of the second UHPC combined box girder, and the transverse UHPC joint structure is cast in place in the recessed casting space.
As a further improvement of the transverse joint structure of the UHPC combined box girder:
the supporting plate comprises a horizontal section, an inclined section and a cantilever section, the horizontal section, the inclined section and the cantilever section are sequentially connected to form a structure with two ends extending horizontally and the middle extending downwards in an inclined mode, the cantilever section of the first UHPC combined box girder is abutted to and fixedly connected with the cantilever section of the second UHPC combined box girder, and the end portion of the top plate extends to one end, far away from the inclined section, of the horizontal section.
The steel inner core also comprises an inner part which is fixedly attached to the inner wall of the upper part of the inner cavity of the UHPC box-type shell, and the support plate is integrally connected to the inner part.
The built-in part comprises an upper bottom plate fixedly attached to the top surface of an inner cavity of the UHPC box-type shell and two side plates connected to the upper bottom plate, the two side plates are fixedly attached to two opposite side walls of the inner cavity of the UHPC box-type shell respectively, the upper bottom plate is connected with the horizontal section into a whole, the two side plates are fixedly connected with the upper bottom plate, the horizontal section and the inclined section respectively in sequence, and a plurality of semi-transverse partition plates arranged at intervals in the beam length direction are further connected between the upper bottom plate and the two side plates.
The outer surfaces of the upper bottom plate and the two side plates are provided with a plurality of shear connectors embedded into UHPC box-type shells, and the horizontal section, the inclined section and the cantilever section are provided with a plurality of shear connectors embedded into transverse UHPC joint structures.
The lower surfaces of the horizontal section and the inclined section are provided with a plurality of shear connectors embedded into the UHPC box-type shell.
The top plate comprises a plurality of grooves and tongues which extend horizontally towards the concave pouring space and are arranged at intervals, and the grooves and tongues are embedded in the transverse UHPC joint structure.
The UHPC box-type shell further comprises a support diaphragm plate, and a man hole for internal maintenance is formed in the support diaphragm plate.
The transverse UHPC joint structure is a steel bar UHPC structure, embedded steel bars extending into the downward concave type pouring space from one end, close to the concave type pouring space, of the top plate are embedded in the top plate, the steel bars in the transverse UHPC joint structure comprise a plurality of longitudinal steel bars which are parallel to the embedded steel bars and are arranged in a staggered mode and transverse steel bars which are perpendicular to the embedded steel bars and are arranged at intervals, the transverse steel bars are bound and connected or welded with the embedded steel bars, and the transverse steel bars are bound and connected or welded with the longitudinal steel bars.
A construction method adopting a transverse joint structure of a UHPC combined box girder comprises the following steps:
s1: manufacturing a steel inner core according to the design size in a factory; the outer side prefabricated die and the inner side lower die of the UHPC box-type shell are erected and formed in a factory, the steel inner core is hung into the prefabricated die of the UHPC box-type shell and fixed, and the steel inner core is used as an inner side upper template of the UHPC box-type shell; pouring UHPC in a non-joint area of the UHPC box type shell; and (4) performing high-temperature steam curing, and removing the outer prefabricated mold and the inner lower mold after the curing is finished to form a first UHPC combined box girder and a second UHPC combined box girder.
S2: transporting the first UHPC combined box girder and the second UHPC combined box girder to an installation position, and erecting the first UHPC combined box girder and the second UHPC combined box girder by using a beam hanging device to form a multi-span simply supported girder; and welding or bolting the steel inner core of the first UHPC combined box girder and the steel inner core of the second UHPC combined box girder in the adjacent girder sections together to form the bottom formwork of the cast-in-situ transverse UHPC joint structure.
S3: and performing chiseling treatment on the top plate interfaces of the first UHPC combined box girder and the second UHPC combined box girder, and binding and connecting or welding longitudinal steel bars and transverse steel bars.
S4: and pouring UHPC at the joint structure of the transverse UHPC, performing high-temperature steam curing, and forming the UHPC combined box girder bridge which is simply supported firstly and then has a continuous partial structure after the curing is finished.
Compared with the prior art, the invention has the advantages that: according to the UHPC combined box girder transverse joint structure, the support plate of the first UHPC combined box girder is in butt joint with the support plate of the second UHPC combined box girder, and the support plate of the first UHPC combined box girder and the support plate of the second UHPC combined box girder enclose a recessed pouring space with an upper opening, namely the support plate of the first UHPC combined box girder, the support plate of the second UHPC combined box girder, the end surface of the top plate of the first UHPC combined box girder and the end surface of the top plate of the second UHPC combined box girder form a bottom die and a part of UHC side dies for forming a transverse UHPC joint structure, and the transverse UHPC joint structure is cast in situ in the recessed pouring space. Compared with the conventional structure continuous structure after simple support, the structure continuous structure has the advantages that a complex template does not need to be erected when UHPC is poured, tensioning prestress is not needed, the size of a joint is greatly reduced, and the transverse UHPC joint structure is cast in situ, so that the prefabricated dead weight of the first UHPC combined box girder and the second UHPC combined box girder can be effectively reduced, the hoisting difficulty and the construction difficulty are reduced, the construction efficiency is effectively improved, and the construction progress is accelerated. On the other hand, compared with the conventional continuous structure of simply supporting and then bridge deck, the thickness of the transverse UHPC joint structure is extended downwards from the top plate to the supporting plate due to the formed concave pouring space, so that the thickness of the transverse UHPC joint structure is expanded, the rigidity of the cross section of the transverse UHPC joint structure is effectively improved, the longitudinal tensile stress at the transverse UHPC joint structure is greatly reduced, the cracking risk is eliminated, the deformation at the transverse UHPC joint structure can be reduced, and the driving comfort is improved. In addition, the UHPC material has high compactness, low permeability and excellent anti-cracking performance, thereby effectively ensuring the long-term service performance of the bridge structure in a complex and severe climate environment.
Drawings
Fig. 1 is a schematic perspective view of a transverse joint structure of a UHPC composite box girder.
Fig. 2 is a side view schematic diagram of a transverse joint structure of a UHPC composite box girder.
Fig. 3 is a schematic top view of a cross-joint structure of a UHPC composite box girder.
Fig. 4 isbase:Sub>A cross-sectional view taken along the planebase:Sub>A-base:Sub>A in fig. 2.
FIG. 5 is a sectional view taken along the plane B-B (at the diaphragm half) in FIG. 3.
Fig. 6 is a schematic perspective view of a UHPC box-type outer shell and a steel inner core.
Fig. 7 is a schematic perspective view of the steel core.
Fig. 8 is a left side view structural schematic diagram of the steel core.
Illustration of the drawings:
1. a first UHPC combination box beam; 11. a UHPC box-type housing; 111. a top plate; 1111. a tongue-and-groove; 112. a support diaphragm plate; 113. a human hole; 12. a steel inner core; 121. a support plate; 1211. a horizontal segment; 1212. an inclined section; 1213. a cantilever section; 122. an internal part; 1221. an upper base plate; 1222. a side plate; 2. a second UHPC composite box girder; 3. a transverse UHPC seam construction; 4. a semi-diaphragm plate; 5. a shear connector; 6. embedding reinforcing steel bars in advance; 7. longitudinal reinforcing steel bars; 8. and transverse reinforcing steel bars.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 8, the transverse joint structure of the UHPC combined box girder according to this embodiment includes a first UHPC combined box girder 1 that is prefabricated, a second UHPC combined box girder 2 that is prefabricated, and a transverse UHPC joint structure 3 cast in place between the first UHPC combined box girder 1 and the second UHPC combined box girder 2, where each of the first UHPC combined box girder 1 and the second UHPC combined box girder 2 includes a UHPC box-type shell 11 and an inner steel core 12 attached and fixed to an inner wall of the UHPC box-type shell 11, the UHPC box-type shell 11 includes a top plate 111, the inner steel core 12 includes an exposed support plate 121, the support plate 121 of the first UHPC combined box girder 1 is butted with the support plate 121 of the second UHPC combined box girder 2, and forms a recessed casting space with an upper opening together with a top plate 111 of the first UHPC combined box girder 1 and the top plate 111 of the second UHPC combined box girder 2, and the transverse recessed joint structure 3 is cast in place in the casting space. The first UHPC combined box girder 1 and the second UHPC combined box girder 2 are both prefabricated and formed, and the first UHPC combined box girder 1 and the second UHPC combined box girder 2 are connected through a cast-in-place transverse UHPC seam structure 3, so that the continuous structure of the part structure after simply supporting of the multi-span continuous box girder bridge is realized. Because the supporting plate 121 of the first UHPC combined box girder 1 is butted with the supporting plate 121 of the second UHPC combined box girder 2, and the supporting plate is surrounded with the top plate 111 of the first UHPC combined box girder 1 and the top plate 111 of the second UHPC combined box girder 2 to form a recessed casting space with an open upper portion, that is, the supporting plate 121 of the first UHPC combined box girder 1, the supporting plate 121 of the second UHPC combined box girder 2, the end surface of the top plate 111 of the first UHPC combined box girder 1 and the end surface of the top plate 111 of the second UHPC combined box girder 2 form a bottom die and a partial side die for forming the transverse UHPC joint structure 3, and the transverse UHPC joint structure 3 is cast in situ in the recessed casting space. Compared with the conventional structure continuous structure after simple support, the structure continuous structure has the advantages that a complex template does not need to be erected when UHPC is poured, tensioning prestress is not needed, the size of a joint is greatly reduced, and the transverse UHPC joint structure 3 is cast in place, so that the prefabricated dead weight of the first UHPC combined box girder 1 and the second UHPC combined box girder 2 can be effectively reduced, the hoisting difficulty and the construction difficulty are reduced, the construction efficiency is effectively improved, and the construction progress is accelerated. On the other hand, compared with the conventional continuous structure of simply supported and then bridge deck, the formed concave pouring space enables the thickness of the transverse UHPC joint structure 3 to extend downwards from the top plate 111 to the support plate 121, so that the thickness of the transverse UHPC joint structure 3 is expanded, the rigidity of the cross section of the transverse UHPC joint structure 3 is effectively improved, the longitudinal tensile stress at the transverse UHPC joint structure 3 is greatly reduced, the cracking risk is eliminated, the deformation at the transverse UHPC joint structure 3 can be reduced, and the driving comfort is improved. In addition, the UHPC material has high compactness, low permeability and excellent crack resistance, thereby effectively ensuring the long-term service performance of the bridge structure in a complex and severe climate environment.
In this embodiment, the supporting plate 121 includes a horizontal section 1211, an inclined section 1212, and a cantilever section 1213, the horizontal section 1211, the inclined section 1212, and the cantilever section 1213 are sequentially connected to form a structure with two ends extending horizontally and a middle extending obliquely downward, the cantilever section 1213 of the first UHPC combined box girder 1 abuts against and is fixedly connected to the cantilever section 1213 of the second UHPC combined box girder 2, and the end of the top plate 111 extends to one end of the horizontal section 1211 away from the inclined section 1212. The horizontal section 1211, the inclined section 1212 and the cantilever section 1213 of the supporting plate 121 are sequentially connected to form a structure with two ends extending horizontally, the middle extending obliquely and downwardly, i.e. one end of the horizontal section 1211 is connected with the inclined section 1212, one end of the inclined section 1212, which is far away from the horizontal section 1211, is inclined downwardly and connected with the cantilever section 1213, so that the lower part of the transverse UHPC joint structure 3 is of an inverted trapezoid structure, the cantilever section 1213 of the first UHPC combined box girder 1 is abutted against and fixedly connected with the cantilever section 1213 of the second UHPC combined box girder 2, so that the supporting plate 121 of the first UHPC combined box girder 1 and the supporting plate 121 of the second UHPC combined box girder 2 form a bottom die for forming the transverse UHPC joint structure 3, and by using the supporting plate 121 as the bottom die, the structure is simple, the manufacturing is convenient, and the prefabricated forming can be performed, and the difficulty of site construction is reduced. Preferably, the cantilever section 1213 of the first UHPC combined box girder 1 is connected with the cantilever section 1213 of the second UHPC combined box girder 2 by welding or high-strength bolts.
In this embodiment, the steel core 12 further includes an inner portion 122 attached to and fixed to an upper inner wall of the inner cavity of the UHPC box-shaped case 11, and the support plate 121 is integrally connected to the inner portion 122. The steel inner core 12 further comprises an inner part 122 which is fixedly attached to the inner wall of the upper part of the inner cavity of the UHPC box-type outer shell 11, namely, the inner part 122 of the steel inner core 12 is used as a partial inner mold for molding the UHPC box-type outer shell 11 when the UHPC box-type outer shell 11 is prefabricated, and the steel inner core 12 does not need to be taken out subsequently. By using the inner part 122 as a partial inner mold for molding the UHPC box-type shell 11, the problems of difficult mold removal and the like caused by the fact that the dense diaphragm plates are required to be arranged on the upper half part of the UHPC box-type shell 11 can be effectively solved, construction can be effectively simplified, and construction efficiency can be improved. On the other hand, the steel inner core 12 and the UHPC box-type outer shell 11 are stressed cooperatively as a combined structure, so that the bearing capacity of the structure can be effectively improved, and the thickness of the UHPC box-type outer shell 11 is reduced.
In this embodiment, the built-in portion 122 includes an upper bottom plate 1221 attached and fixed to the top surface of the inner cavity of the UHPC box-type housing 11 and two side plates 1222 connected to the upper bottom plate 1221, the two side plates 1222 are respectively attached and fixed to two opposite side walls of the inner cavity of the UHPC box-type housing 11, the upper bottom plate 1221 is connected to the horizontal section 1211 as a whole, the two side plates 1222 are respectively and sequentially fixedly connected to the upper bottom plate 1221, the horizontal section 1211 and the inclined section 1212, and a plurality of half-transverse partition plates 4 are further connected between the upper bottom plate 1221 and the two side plates 1222 and spaced apart from each other in the length direction of the beam. The inner part 122 is set into the form of an upper bottom plate 1221 and two side plates 1222 and can be used as an upper inner die for forming the UHPC box-type shell 11, the upper bottom plate 1221 and the horizontal section 1211 of the support plate 121 are connected into a whole, the support plate 121 is used as a bottom die for forming the transverse UHPC joint structure 3, and the steel inner core 12 is set into the structural form of the inner part 122 and the support plate 121, so that the steel inner core 12 is used as a partial die plate for forming the UHPC box-type shell 11 and the transverse UHPC joint structure 3, and the structure is simple and the arrangement is reasonable. Then, a plurality of half diaphragms 4 are arranged between the upper bottom plate 1221 and the two side plates 1222. Preferably, the distance between each half diaphragm 4 is 2-10m, and in the present embodiment, the distance between each half diaphragm 4 is 5m.
In this embodiment, a plurality of shear connectors 5 embedded in the UHPC box-type housing 11 are disposed on the outer surfaces of the upper base plate 1221 and the two side plates 1222, and a plurality of shear connectors 5 embedded in the transverse UHPC joint structure 3 are disposed on the horizontal section 1211, the inclined section 1212, and the cantilever section 1213. The outer surfaces of the upper bottom plate 1221 and the two side plates 1222 are provided with a plurality of shear connectors 5 embedded in the UHPC box-type shell 11, the horizontal sections 1211, the inclined sections 1212 and the cantilever sections 1213 are provided with a plurality of shear connectors 5 embedded in the transverse UHPC joint structure 3, so that the connection stability of the upper bottom plate 1221 and the two side plates 1222 and the UHPC box-type shell 11 and the connection stability of the horizontal sections 1211, the inclined sections 1212 and the cantilever sections 1213 and the transverse UHPC joint structure 3 can be improved. Preferably, the shear connector 5 is welded to the upper base plate 1221 and the two side plates 1222, the shear connector 5 is arranged on the upper base plate 1221 and the two side plates 1222 at intervals, the shear connector 5 is welded to the horizontal section 1211, the inclined section 1212 and the cantilever section 1213, and the shear connector 5 is arranged on the horizontal section 1211, the inclined section 1212 and the cantilever section 1213 at intervals.
In this embodiment, the lower surfaces of the horizontal 1211 and inclined 1212 sections are provided with a plurality of shear connectors 5 embedded in the UHPC box-type housing 11. The shear connectors 5 embedded in the UHPC box-type shell 11 are arranged on the lower surfaces of the horizontal section 1211 and the inclined section 1212, so that the connection stability between the horizontal section 1211 and the inclined section 1212 and the UHPC box-type shell 11 can be improved, the shear connectors 5 do not need to be arranged on the lower surface of the cantilever section 1213, and the shear connectors 5 do not need to be arranged on the lower surfaces of the horizontal section 1211 and the inclined section 1212, which are not in contact with the UHPC box-type shell 11, because the cantilever section 1213 protrudes out of the UHPC box-type shell 11. Preferably, the shear connector 5 is welded to the horizontal section 1211 and the inclined section 1212, and the shear connector 5 is disposed at intervals on the lower surfaces of the horizontal section 1211 and the inclined section 1212. In this embodiment, the spacing between adjacent shear connectors 5 is 0.2m.
In this embodiment, the top plate 111 includes a plurality of grooves 1111 extending horizontally and spaced apart from each other in the recessed casting space, and the grooves 1111 are embedded in the lateral UHPC joint structure 3. The top plate 111 comprises the horizontally extending rabbet 1111, the rabbet 1111 is embedded in the transverse UHPC joint structure 3, and compared with the connection mode that the top plate 111 is flush with the transverse UHPC joint structure 3, the rabbet 1111 is arranged to enable the top plate 111 and the transverse UHPC joint structure 3 to be concave-convex alternated and can be meshed with each other, the anti-cracking strength of the joint is effectively improved, and the joint cracking risk is greatly reduced. Preferably, the rebates 1111 are trapezoidal teeth of increasing width from the top panel 111 to the transverse UHPC seam structure 3.
In this embodiment, the UHPC box-type housing 11 further includes a support diaphragm 112, and the support diaphragm 112 is provided with a man hole 113 for internal maintenance. And a manhole 113 is formed in the support diaphragm 112, so that personnel can pass through the manhole, and the inner overhaul of the first UHPC combined box girder 1 and the second UHPC combined box girder 2 is facilitated. In this embodiment, the standoff diaphragms 112 are 0.5m thick.
In this embodiment, horizontal UHPC joint structure 3 is reinforcing bar UHPC structure, pre-buried in the roof 111 being close to recessed formula pouring space one end from roof 111 and pouring the embedded steel bar 6 that extends in the space to the recessed formula, reinforcing bar in the horizontal UHPC joint structure 3 includes a plurality of vertical reinforcing bar 7 that are parallel with embedded steel bar 6 and crisscross setting and the horizontal reinforcing bar 8 that sets up with embedded steel bar 6 perpendicular and interval, horizontal reinforcing bar 8 and 6 binding connection or welding of embedded steel bar, horizontal reinforcing bar 8 and 7 binding connection or welding of vertical reinforcing bar. The transverse UHPC joint structure 3 is set as a steel bar UHPC structure, the steel bar UHPC structure is composed of steel bars and UHPC, the service performance of the transverse UHPC joint structure 3 can be improved, and the shock resistance and crack resistance of the transverse UHPC joint structure 3 are enhanced. The embedded steel bars 6 are embedded in the top plate 111 and extend into the recessed pouring space, the longitudinal steel bars 7 and the embedded steel bars 6 are placed in a staggered mode on site, then the transverse steel bars 8 are placed, and the transverse steel bars 8 and the longitudinal steel bars 7 and the intersection points of the transverse steel bars 8 and the embedded steel bars 6 are bound and connected or welded to form the steel bars in the transverse UHPC joint structure 3. Preferably, the length of the embedded steel bars 6 extending into the recessed pouring space is not less than 20 times of the diameter of the embedded steel bars, and the embedded steel bars 6, the longitudinal steel bars 7 and the transverse steel bars 8 are all ribbed steel bars with strength grades not lower than three levels and diameters not less than 12 mm. In this embodiment, the embedded bars 6 extend to the recessed pouring space by 0.4m, the distance between the embedded bars 6 is 100mm, the distance between the longitudinal bars 7 and the transverse bars 8 is 100mm, the longitudinal bars 7 and the embedded bars 6 are arranged in a staggered manner, and the distance between the longitudinal bars 7 and the embedded bars 6 is 50mm.
The specific structural dimension of the transverse joint structure of the UHPC combined box girder in the embodiment is as follows: the first UHPC combined box girder 1 and the second UHPC combined box girder 2 have the girder length of 100m, the girder height of 4m and the distance between the first UHPC combined box girder and the second UHPC combined box girder of 1.0m; the thicknesses of the top plate 111 of the first UHPC combined box girder 1 and the top plate 111 of the second UHPC combined box girder 2 are both 0.16m, and the thicknesses of the steel inner core 12 of the first UHPC combined box girder 1 and the steel inner core 12 of the second UHPC combined box girder 2 are both 0.01m; the maximum height of the transverse UHPC joint structure 3 is 1/2 of the beam height, i.e. H =2m, oneSide seam length, i.e. distance L from end surface of top plate 111 to end surface of support diaphragm 112 i 2 times H, 4m, the distance length L formed by the end face of the top plate 111 and the horizontal section 1211 1 Is 1m, height H 1 Is 0.2m, the distance length L from the inclined section 1212 to the end face of the support diaphragm 112 2 Is 3m, height H 2 Is 1.8m.
The construction method of the UHPC combined box girder transverse joint structure comprises the following steps:
step S1: manufacturing the steel inner core 12 according to the design size in a factory; an outer side prefabricated mould and an inner side lower mould of the UHPC box-type outer shell 11 are erected and formed in a factory, a steel inner core 12 is hung into the prefabricated mould of the UHPC box-type outer shell 11 and fixed, and the steel inner core 12 is used as an inner side upper template of the UHPC box-type outer shell 11; pouring UHPC in a non-joint area of the UHPC box-type shell 11; and (4) performing high-temperature steam curing, and removing the outer prefabricated die and the inner lower die after the curing is finished to form a first UHPC combined box girder 1 and a second UHPC combined box girder 2.
Step S2: the first UHPC combined box girder 1 and the second UHPC combined box girder 2 are conveyed to an installation position and erected by using beam hanging equipment to form a multi-span simply supported girder; and welding or bolting the steel inner core 12 of the first UHPC combined box girder 1 and the steel inner core 12 of the second UHPC combined box girder 2 in the adjacent girder sections together to form a bottom formwork of the cast-in-situ transverse UHPC joint structure 3.
And step S3: and performing chiseling treatment on the interfaces of the top plates 111 of the first UHPC combined box girder 1 and the second UHPC combined box girder 2, and binding and connecting or welding the longitudinal steel bars 7 and the transverse steel bars 8.
And step S4: and pouring UHPC at the transverse UHPC joint structure 3, performing high-temperature steam curing, and forming the UHPC combined box girder bridge which is simply supported firstly and then has a continuous partial structure after the curing is finished.
According to the construction method, the first UHPC combined box girder 1 and the second UHPC combined box girder 2 are formed in a factory, the field construction difficulty can be reduced, the transverse UHPC joint structure 3 is cast in situ after the multi-span simply supported girder is formed by hoisting and erecting, a complex template can be prevented from being erected when the transverse UHPC joint structure 3 is poured, the construction efficiency is improved, and the construction method is simplified in steps and reasonable in operation.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. Modifications and variations that may occur to those skilled in the art without departing from the spirit and scope of the invention are to be considered as within the scope of the invention.
Claims (10)
1. A UHPC combination box girder transverse joint structure, includes prefabricated first UHPC combination box girder (1), prefabricated second UHPC combination box girder (2) and cast-in-place in the transverse UHPC joint structure (3) between first UHPC combination box girder (1) and second UHPC combination box girder (2), its characterized in that: the first UHPC combined box girder (1) and the second UHPC combined box girder (2) respectively comprise UHPC box-type shells (11) and steel inner cores (12) which are fixedly attached to the inner walls of the UHPC box-type shells (11), each UHPC box-type shell (11) comprises a top plate (111), each steel inner core (12) comprises an exposed supporting plate (121), the supporting plates (121) of the first UHPC combined box girder (1) and the supporting plates (121) of the second UHPC combined box girder (2) are in butt joint, a concave pouring space with an upper opening is formed by the supporting plates (121) of the first UHPC combined box girder (1) and the top plates (111) of the second UHPC combined box girder (2) in a surrounding mode, and the transverse UHPC joint structures (3) are cast in place in the concave pouring space.
2. The UHPC composite box beam transverse seam construction of claim 1 wherein: the supporting plate (121) comprises a horizontal section (1211), an inclined section (1212) and a cantilever section (1213), the horizontal section (1211), the inclined section (1212) and the cantilever section (1213) are sequentially connected to form a structure with two ends extending horizontally, the middle extending downwards in an inclined mode, the cantilever section (1213) of the first UHPC combined box girder (1) is abutted to and fixedly connected with the cantilever section (1213) of the second UHPC combined box girder (2), and the end of the top plate (111) extends to one end, away from the inclined section (1212), of the horizontal section (1211).
3. The UHPC composite box girder transverse seam construction of claim 2, wherein: the steel inner core (12) further comprises an inner part (122) which is fixedly attached to the inner wall of the upper part of the inner cavity of the UHPC box-type outer shell (11), and the supporting plate (121) is integrally connected to the inner part (122).
4. The UHPC composite box beam transverse seam construction of claim 3 wherein: interior portion (122) including with UHPC box shell (11) inner chamber top surface laminating fixed upper plate (1221) and connect in two curb plate (1222) on upper plate (1221), two curb plate (1222) are fixed with the relative both sides wall laminating of UHPC box shell (11) inner chamber respectively, upper plate (1221) is connected as an organic whole with horizontal segment (1211), two curb plate (1222) respectively in proper order with upper plate (1221), horizontal segment (1211) and slope section (1212) fixed connection, still be connected with between upper plate (1221) and two curb plate (1222) along the half cross slab (4) of polylith that the roof beam length direction interval set up.
5. The UHPC composite box beam transverse seam construction of claim 4 wherein: the outer surfaces of the upper bottom plate (1221) and the two side plates (1222) are provided with a plurality of shear connectors (5) embedded into the UHPC box-type shell (11), and the horizontal section (1211), the inclined section (1212) and the cantilever section (1213) are provided with a plurality of shear connectors (5) embedded into the transverse UHPC seam structure (3).
6. The UHPC composite box beam transverse seam construction of claim 5 wherein: the lower surfaces of the horizontal section (1211) and the inclined section (1212) are provided with a plurality of shear connectors (5) embedded in a UHPC box-type shell (11).
7. The UHPC composite box girder transverse seam construction of claim 1, wherein: the top plate (111) comprises a plurality of grooves and tongues (1111) which extend horizontally towards the concave pouring space and are arranged at intervals, and the grooves and tongues (1111) are embedded in the transverse UHPC joint structure (3).
8. The UHPC composite box girder transverse seam construction of claim 1, wherein: the UHPC box-type shell (11) further comprises a support diaphragm plate (112), and a man hole (113) for internal maintenance is formed in the support diaphragm plate (112).
9. The UHPC composite box beam transverse seam construction of any one of claims 1 to 8 wherein: the transverse UHPC joint structure (3) is a steel bar UHPC structure, embedded steel bars (6) extending from one end, close to the concave pouring space, of the top plate (111) to the concave pouring space are embedded in the top plate (111), the steel bars in the transverse UHPC joint structure (3) comprise a plurality of longitudinal steel bars (7) parallel to the embedded steel bars (6) and arranged in a staggered mode and transverse steel bars (8) perpendicular to the embedded steel bars (6) and arranged at intervals, the transverse steel bars (8) are connected or welded with the embedded steel bars (6), and the transverse steel bars (8) are connected or welded with the longitudinal steel bars (7) in a binding mode.
10. A construction method using the UHPC composite box girder transverse joint structure of claim 9, wherein: the method comprises the following steps:
s1: manufacturing a steel core (12) according to the design size in a factory; an outer side prefabricated die and an inner side lower die of the UHPC box-type outer shell (11) are formed in a factory, a steel inner core (12) is hung into the prefabricated die of the UHPC box-type outer shell (11) and fixed, and the steel inner core (12) is used as an inner side upper template of the UHPC box-type outer shell (11); pouring UHPC in a non-joint area of the UHPC box-type shell (11); performing high-temperature steam curing, and dismantling the outer prefabricated mold and the inner lower mold after the curing is finished to form a first UHPC combined box girder (1) and a second UHPC combined box girder (2);
s2: the method comprises the following steps that a first UHPC combined box girder (1) and a second UHPC combined box girder (2) are conveyed to an installation position and erected by using hanging beam equipment to form a multi-span simply supported girder; welding or bolting the steel inner core (12) of the first UHPC combined box girder (1) and the steel inner core (12) of the second UHPC combined box girder (2) in the adjacent girder sections together to form a bottom mould of the cast-in-situ transverse UHPC joint structure (3);
s3: performing chiseling treatment on the interfaces of top plates (111) of a first UHPC combined box girder (1) and a second UHPC combined box girder (2), and binding and connecting or welding longitudinal steel bars (7) and transverse steel bars (8);
s4: and pouring UHPC at the transverse UHPC joint structure (3), performing high-temperature steam curing, and forming the UHPC combined box girder bridge which is simply supported firstly and then has a continuous partial structure after the curing is finished.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1524149A (en) * | 2001-06-05 | 2004-08-25 | 邦那契梁柱(国际)控股有限公司 | Building structural element |
| KR20080081884A (en) * | 2008-08-21 | 2008-09-10 | 연정흠 | Concrete box-girder with inclined tendons on the plane of flange |
| CN105155399A (en) * | 2015-07-31 | 2015-12-16 | 中铁第四勘察设计院集团有限公司 | Small box girder bridge and building method thereof |
| CN108252210A (en) * | 2018-04-09 | 2018-07-06 | 长沙理工大学 | Subsection cast-in-situ UHPC bridge beam section connectors and its construction method |
| CN209923769U (en) * | 2019-03-27 | 2020-01-10 | 湖南大学 | Section steel-UHPC combined plate and bridge deck |
| CN111549658A (en) * | 2020-05-30 | 2020-08-18 | 同济大学 | Continuous bridge joint structure and continuous box girder bridge structure |
| CN111705650A (en) * | 2020-06-01 | 2020-09-25 | 湖南大学 | UHPC beam slab cast-in-place joint structure with embedded reinforced steel component and construction method thereof |
| CN111877182A (en) * | 2020-09-03 | 2020-11-03 | 广东省建筑设计研究院有限公司 | Novel construction method for upper structure of multi-chamber continuous UHPC box girder bridge |
| CN114215249A (en) * | 2022-01-06 | 2022-03-22 | 西安建筑科技大学 | Separated seam-connected UHPC-NC laminated slab with shear groove keys and construction method thereof |
| US20220412069A1 (en) * | 2021-04-20 | 2022-12-29 | Mathew Chirappuram Royce | Pre-Fabricated Link Slab - Ultra High Performance Concrete |
-
2023
- 2023-02-21 CN CN202310142201.4A patent/CN115928558B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1524149A (en) * | 2001-06-05 | 2004-08-25 | 邦那契梁柱(国际)控股有限公司 | Building structural element |
| KR20080081884A (en) * | 2008-08-21 | 2008-09-10 | 연정흠 | Concrete box-girder with inclined tendons on the plane of flange |
| CN105155399A (en) * | 2015-07-31 | 2015-12-16 | 中铁第四勘察设计院集团有限公司 | Small box girder bridge and building method thereof |
| CN108252210A (en) * | 2018-04-09 | 2018-07-06 | 长沙理工大学 | Subsection cast-in-situ UHPC bridge beam section connectors and its construction method |
| CN209923769U (en) * | 2019-03-27 | 2020-01-10 | 湖南大学 | Section steel-UHPC combined plate and bridge deck |
| CN111549658A (en) * | 2020-05-30 | 2020-08-18 | 同济大学 | Continuous bridge joint structure and continuous box girder bridge structure |
| CN111705650A (en) * | 2020-06-01 | 2020-09-25 | 湖南大学 | UHPC beam slab cast-in-place joint structure with embedded reinforced steel component and construction method thereof |
| CN111877182A (en) * | 2020-09-03 | 2020-11-03 | 广东省建筑设计研究院有限公司 | Novel construction method for upper structure of multi-chamber continuous UHPC box girder bridge |
| US20220412069A1 (en) * | 2021-04-20 | 2022-12-29 | Mathew Chirappuram Royce | Pre-Fabricated Link Slab - Ultra High Performance Concrete |
| CN114215249A (en) * | 2022-01-06 | 2022-03-22 | 西安建筑科技大学 | Separated seam-connected UHPC-NC laminated slab with shear groove keys and construction method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 姚志立;晏班夫;: "装配式UHPC桥梁湿接缝模型试验及受弯性能研究", 公路工程, no. 03 * |
| 陈卫全等: "《预制混凝土桥面板湿接缝构造形式研究》", 《内蒙古公路与运输》, no. 1, pages 6 - 16 * |
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Application publication date: 20230407 Assignee: HUNAN PROVINCIAL COMMUNICATIONS PLANNING SURVEY AND DESIGN INSTITUTE Co.,Ltd. Assignor: HUNAN University Contract record no.: X2023980043232 Denomination of invention: A Transverse Joint Construction and Construction Method for UHPC Composite Box Girders Granted publication date: 20230602 License type: Common License Record date: 20231016 |
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