CN212270647U

CN212270647U - Joint connection structure of UHPC short rib bridge deck slab and steel-UHPC combined bridge

Info

Publication number: CN212270647U
Application number: CN202021620281.8U
Authority: CN
Inventors: 邵旭东; 曹君辉; 邵宗暄
Original assignee: Hunan University
Current assignee: Hunan University
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-01-01
Anticipated expiration: 2030-08-06

Abstract

The utility model discloses a seam connection structure of short rib decking of UHPC, the short rib decking of UHPC include the UHPC panel and set firmly in the rib indulges of UHPC panel bottom, seam connection structure is including locating adjacently the cast-in-place UHPC connecting portion of UHPC panel department with locate adjacently indulge the rib connecting portion of rib department. The utility model also provides a steel-UHPC combination bridge, include the girder steel and locate the short rib decking of the split type UHPC of polylith on girder steel upper portion, it is adjacent the short rib decking longitudinal bridge of UHPC constructs to the seam connection through the short rib decking of foretell UHPC and connects into an organic whole. The utility model discloses a seam connection structure has seam in small quantity, seam fracture risk low, the dead weight is light, intensity is high, the assembly rate is high, the construction is simple and convenient, the quality is controllable, the durability is good, outstanding advantages such as economic nature is excellent.

Description

Joint connection structure of UHPC short rib bridge deck slab and steel-UHPC combined bridge

Technical Field

The utility model belongs to the bridge field especially relates to a seam structure and combination bridge.

Background

The Ultra-High Performance Concrete (UHPC) has the advantages of High elastic modulus, High tensile strength, good shrinkage and creep characteristics, excellent durability and the like, can reduce the structure size, reduce the structure dead weight, increase the spanning capability of a bridge structure, and has wide application prospect. The creep coefficient and later-period shrinkage of UHPC can be obviously reduced through high-temperature curing; the structure quality can be further ensured through factory prefabrication, the field construction workload is reduced, and the construction speed is accelerated; and the UHPC has small section size and is convenient to transport and hoist, so the UHPC structure is suitable for adopting the assembly construction.

The UHPC short rib bridge deck is a bridge deck form emerging in recent years, is suitable for steel-UHPC combined structure bridge, and has the structural characteristics that: the panel bottom surface is only along indulging the bridge to setting up the stiffening rib to improve whole decking's rigidity, effectively reduce decking's dead weight and avoid the fracture risk that ordinary concrete decking generally faces.

The transverse seam of the UHPC low rib bridge deck is generally arranged at the flange plate position on the transverse partition plate. Under the action of local wheel load, the seams are all positioned in a hogging moment area, so that the top surfaces of the seams are pulled, steel fibers which are distributed in the UHPC in a disorderly mode are artificially cut off at the cross sections of the seams due to the existence of the seams, no steel fibers penetrate through the seams, the tensile strength of the UHPC at the seams is greatly reduced, the cast-in-place seams become weak positions of UHPC layers, and the cracking risk of the cross sections of the seams is increased. Meanwhile, the seam arrangement method leads to the fact that seams are required to be arranged at the positions of all diaphragm plates (or cross beams), the number of the seams is large, the cast-in-place operation amount is large, and the construction period and the cost are increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome not enough and the defect mentioned in the above background art, provide a horizontal seam connection structure and steel-UHPC combination bridge of the short rib decking of UHPC that horizontal seam is small in quantity, the cast-in-place UHPC side of seam is few, seam department fracture risk is low, be applicable to the bridge of striding footpath greatly. In order to solve the technical problem, the utility model provides a technical scheme does:

a joint connection structure of a UHPC (ultra high Performance concrete) short-rib bridge panel comprises UHPC panels and longitudinal ribs fixedly arranged at the bottoms of the UHPC panels, the joint connection structure is arranged between the adjacent UHPC short-rib bridge panels, the joint connection structure comprises a cast-in-place UHPC connection part arranged at the adjacent UHPC panels and longitudinal rib connection parts arranged at the adjacent longitudinal ribs (the adjacent longitudinal ribs are longitudinal ribs on different UHPC short-rib bridge panels), each longitudinal rib connection part comprises a first pre-buried connection steel component and a first fixed connection part used for connecting the adjacent first pre-buried connection steel components, and the first pre-buried connection steel components are arranged on the longitudinal ribs. The longitudinal ribs and the UHPC panel are integrally formed, and the material of the longitudinal ribs is UHPC. The end parts of the two adjacent UHPC panels are arranged closely, and the upper half part is provided with a notch for forming a cast-in-place UHPC connecting part by cast-in-place UHPC. The seam connection structure is characterized in that the upper half part adopts cast-in-place UHPC, and the lower half part is connected through a fastening component. The UHPC short rib bridge deck is prefabricated in a factory, longitudinal and transverse reinforcing steel bars are only distributed in the UHPC deck, and the diameter of the reinforcing steel bars is preferably 0.014-0.024 m.

In the above seam connection structure, preferably, the seam connection structure is a transverse bridge seam connection structure; the center spacing k between the transverse bridge joint connecting structure and the transverse partition plate or the cross beam closest to the transverse bridge joint connecting structure is 0.2-0.5 times of the center spacing between the adjacent transverse partition plates or the center spacing between the adjacent transverse partition plates and the cross beam, so that the transverse bridge joint connecting structure is arranged in a positive bending moment area between the adjacent transverse partition plates or between the adjacent cross beams, the top surface of a cast-in-place joint is prevented from being pulled, the anti-cracking performance of the joint is favorably ensured, and the cracking risk of the cast-in-place joint is greatly reduced. The limitation on the position of the transverse bridge direction joint structure is to enable the transverse bridge direction joint structure to be far away from the transverse partition plates or the transverse beams, the distance between the transverse bridge direction center line of the transverse bridge direction joint structure and the transverse bridge direction center line of the transverse partition plate closest to the transverse bridge direction center line is k, or the distance between the transverse bridge direction center line of the transverse bridge direction joint structure and the transverse bridge direction center line of the transverse partition plate closest to the transverse bridge direction center line is k, the transverse bridge direction center distance between adjacent transverse partition plates or the transverse bridge direction center distance between the adjacent transverse partition plates and the transverse beams is m, and at the moment, k is 0.2-0.5 times of m.

In the seam connection structure, preferably, the first pre-buried connecting steel component is a first deformed steel plate or a first flat steel plate arranged in the transverse bridge direction (the width is 0.03-0.06m, and the width of the third flat steel plate can be the same as that of the first flat steel plate); the first special-shaped steel plate is pre-embedded between the adjacent longitudinal ribs at the longitudinal end part (namely the longitudinal bridge direction two ends) of the UHPC low-rib bridge deck (the adjacent longitudinal ribs refer to the longitudinal ribs on the same UHPC low-rib bridge deck), the first special-shaped steel plate comprises a bottom plate and two side plates, the bottom plate is arranged at the bottoms of the two side plates and is respectively connected with the two side plates, and the two side plates are respectively fixedly connected with the adjacent side walls of the adjacent longitudinal ribs through studs; the first flat steel plate is pre-buried at the bottom of the longitudinal rib at the longitudinal end of the UHPC low-rib bridge deck. The shape of the side plate and the bottom plate after combination is the same as the shape of the inner cavity between the adjacent longitudinal ribs. The first deformed steel plate is provided with a plurality of (a plurality of) longitudinal ribs arranged along the transverse bridge direction, the first deformed steel plate is arranged between every two adjacent longitudinal ribs, and the bottom surface of the first deformed steel plate is preferably flush with the bottoms of the longitudinal ribs. The side plates are provided with a plurality of pegs for connecting with the side walls of the longitudinal ribs. Bolt holes are uniformly formed in the bottom plate and are used for being matched with the longitudinal connecting steel plate and the longitudinal connecting bolts. The first flat steel plate is provided with a plurality of studs at corresponding positions of the bottoms of the longitudinal ribs and is used for being connected with the bottoms of the longitudinal ribs. Preferably, the outer side end of the first flat steel plate is flush with the longitudinal end of the UHPC low-rib bridge deck, bolt holes are uniformly formed in the first flat steel plate and used for being matched with the longitudinal connecting steel plate and the longitudinal connecting bolts, and the bolt holes are formed between adjacent longitudinal ribs.

In the above seam connection structure, preferably, the first fixing connector includes a longitudinal connecting steel plate and a longitudinal connecting bolt, the longitudinal connecting steel plate is provided with a bolt hole matched with the longitudinal connecting bolt, and adjacent first pre-embedded connecting steel assemblies between the longitudinal ribs in the longitudinal direction of the bridge are connected into a whole through the longitudinal connecting steel plate and the longitudinal connecting bolt. The bottom surface of the first special-shaped steel plate or the first straight steel plate is provided with bolt holes, the bolt holes correspond to the bolt holes in the longitudinal connecting steel plate, the longitudinal connecting steel plate is placed between the adjacent first special-shaped steel plate bottom plates or between the adjacent first straight steel plates, and the adjacent first special-shaped steel plates or the first straight steel plates can be connected through the longitudinal connecting bolts.

In the joint connection structure, the first embedded connecting steel assemblies at the longitudinal ribs of the longitudinal end parts of the adjacent UHPC short-rib bridge panels can be respectively set as a first special-shaped steel plate or a first straight steel plate, or one of the first special-shaped steel plates and the other one of the first straight steel plates can be connected with the longitudinal ribs below the adjacent UHPC short-rib bridge panels through the first fixed connecting piece. When adopting first flat steel sheet, the rib end steel sheet of indulging the rib bottom needs to break off at first flat steel sheet department to in the installation first flat steel sheet.

In the seam connection structure, preferably, the thickness of the UHPC panel is 0.06-0.14m, the longitudinal end of the UHPC panel is provided with a notch, the height of the notch is 30-70% of the thickness of the UHPC panel, and the longitudinal bridge length of the notch is 0.3-0.6 m. The existence of the notch can increase the contact range of the joint UHPC and the UHPC panel, and avoid the low tensile strength and premature crack at the joint caused by the discontinuous fiber of the new and old UHPC interface steel. The longitudinal ribs are in an inverted trapezoid shape, the rib height of each longitudinal rib is 0.08-0.3m, the distance between every two adjacent longitudinal ribs is 0.4-1.0m, the top width of each longitudinal rib is 0.2-0.5m, and the bottom width of each longitudinal rib is 0.15-0.4 m; the rib bottom steel plate is arranged at the bottom of the longitudinal rib, the width of the rib bottom steel plate is the same as that of the longitudinal rib, the thickness of the rib bottom steel plate is 0.006-0.014m, and the top surface of the rib bottom steel plate is provided with a stud for connecting the rib bottom steel plate and the longitudinal rib into a whole. The rib bottom steel plate is synchronously prefabricated on the prefabricated UHPC short rib bridge deck, and the long stud nails are arranged on the rib bottom steel plate to facilitate the connection between the rib bottom steel plate and the longitudinal ribs. The long peg has a diameter of 0.016-0.025m and a length to ensure the net protective layer thickness is not less than 20 mm.

In the joint connection structure, when the UHPC bridge deck slab is suitable in transverse size and convenient for full-width prefabrication, the longitudinal bridge joint connection structure does not need to be arranged, and the specific situation depends on engineering requirements.

As a general technical concept, the utility model provides a steel-UHPC composite bridge, include the girder steel and locate the short rib decking of the split type UHPC of polylith on girder steel upper portion, it is adjacent the short rib decking longitudinal bridge of UHPC is to constructing the joint connection through the short rib decking of foretell UHPC and connecting into an organic whole (the horizontal bridge adopts above-mentioned joint connection structure to the seam). The steel beam is a steel plate beam, a steel box beam, a PK steel beam or a steel truss beam which cancels the orthotropic steel bridge deck. The transverse partition spacing may preferably be 3.0-5.0 m.

In the above steel-UHPC composite bridge, preferably, the UHPC low-rib bridge deck is connected to the diaphragm plate upper flange plate of the steel beam or the beam upper flange plate through a transverse flange plate connecting member, the transverse flange plate connecting member includes a second pre-embedded connecting steel component and a second fixed connecting member for connecting the second pre-embedded connecting steel component to the diaphragm plate upper flange plate or for connecting the second pre-embedded connecting steel component to the beam upper flange plate, and the second pre-embedded connecting steel component is disposed at a junction between the UHPC low-rib bridge deck and the diaphragm plate upper flange plate or at a junction between the UHPC low-rib bridge deck and the beam upper flange plate.

In the steel-UHPC combined bridge, preferably, the second embedded connecting steel component is a third special-shaped steel plate or a third straight steel plate arranged in the transverse bridge direction; the third deformed steel plate is pre-buried between the adjacent longitudinal ribs and comprises a bottom plate, a reinforcing web plate and two side plates, the bottom plate is arranged at the bottoms of the two side plates and is respectively connected with the two side plates, the two side plates are respectively fixedly connected with the adjacent side walls of the adjacent longitudinal ribs, and two sides of the reinforcing web plate are respectively fixedly connected (such as welded) with the two side plates and are vertically arranged in the middle of the bottom plate; the third straight steel plate is pre-buried at the bottom of the longitudinal rib of the UHPC short rib bridge panel. The shape of the side plate, the bottom plate and the reinforcing web after combination is the same as the shape of the inner cavity between the adjacent longitudinal ribs. The third deformed steel plate is provided with a plurality of (a plurality of) longitudinal ribs arranged along the transverse bridge direction, the third deformed steel plate is arranged between every two adjacent longitudinal ribs, and the bottom surface of the third deformed steel plate is preferably arranged flush with the bottoms of the longitudinal ribs. The side plates are provided with a plurality of pegs for connecting with the side walls of the longitudinal ribs. The bottom plate is evenly provided with bolt holes for being matched with the transverse partition plate connecting bolts so as to connect the third deformed steel plate and the transverse partition plate upper flange plate (or the cross beam upper flange plate) into a whole. And a plurality of pegs are arranged on the third straight steel plate at corresponding positions of the bottoms of the longitudinal ribs and are used for being connected with the bottoms of the longitudinal ribs. The third straight steel plate is also evenly provided with bolt holes which are used for being matched with the transverse partition plate connecting bolts so as to connect the third straight steel plate and the transverse partition plate upper flange plate (or the transverse beam upper flange plate) into a whole, and the bolt holes can be opened between the adjacent longitudinal ribs. When the third flat steel plate is used, the rib bottom steel plate at the bottom of the longitudinal rib needs to be broken at the third flat steel plate in order to install the third flat steel plate.

In the above steel-UHPC composite bridge, preferably, a plane on which the reinforcing web of the third deformed steel plate is located and a plane on which the web of the diaphragm plate or the web of the beam is located are the same plane. The arrangement can avoid overlarge deformation and stress caused by a large gap between the UHPC short rib bridge deck and the diaphragm plate upper flange or the beam upper flange plate under the action of local wheels.

In the above steel-UHPC composite bridge, preferably, the diaphragm plate upper flange plate or the beam upper flange plate is provided with a bolt hole, the second fixing connector includes a diaphragm plate connecting bolt, and the second pre-buried connecting steel assembly and the diaphragm plate upper flange plate or the second pre-buried connecting steel assembly and the beam upper flange plate are connected into a whole by the diaphragm plate connecting bolt. The bottom surface of the third special-shaped steel plate or the third straight steel plate is provided with bolt holes, the bolt holes correspond to the bolt holes in the upper flange plate of the diaphragm plate (or the upper flange plate of the cross beam), and the second embedded connecting steel assembly and the upper flange plate of the diaphragm plate (or the upper flange plate of the cross beam) can be connected into a whole through the connecting bolt of the diaphragm plate, so that the transverse bridging connection of the UHPC short rib bridge deck and the lower steel beam is realized.

The longitudinal connecting bolts and the diaphragm plate connecting bolts are uniformly arranged, the number and the spacing of the bolts are determined according to the requirements of shearing resistance and drawing resistance of a steel-UHPC interface, and the bolts are preferably friction type high-strength bolts. A backing plate can be arranged at the contact position of the bolt and each steel plate.

The UHPC short rib bridge deck is prefabricated in a factory, and the installation of the UHPC short rib bridge deck can form a steel-UHPC combined beam section with a steel beam section in the factory, and the UHPC short rib bridge deck can be hoisted on site after the on-site steel beam erection is finished, so that the bridge deck construction is finished. And roughening the top surface of the UHPC short rib bridge deck by means of shot blasting and the like, and paving an asphalt or resin surface layer.

The utility model also provides a construction method of above-mentioned seam connection structure, steel-UHPC combination bridge as follows:

the first construction method comprises the following steps: hoisting a UHPC (ultra high performance concrete) short rib bridge deck on site, arranging a longitudinal bridge between web plates or longitudinal beams to a joint connection structure, adopting a pre-buried special-shaped steel plate to a transverse bridge to the joint connection structure, and specifically comprising the following steps of:

s1: erecting a steel beam;

s2: hoisting a UHPC short rib bridge deck unit on the steel beam;

s3: positioning and installing a UHPC short rib bridge panel unit, and screwing a high-strength bolt at a bolt hole position between the UHPC short rib bridge panel unit and the diaphragm plate upper flange plate;

s4: placing a longitudinal connecting steel plate at the transverse bridge-direction joint, and screwing the high-strength bolt at the position; pouring UHPC at the reserved notch of the transverse bridge seam to complete the construction of the transverse bridge seam;

s5: screwing a high-strength bolt at the bolt hole position between the UHPC low-rib bridge deck unit and the web plate or the longitudinal beam upper flange plate;

s6: installing transverse connecting steel plates at the longitudinal bridge direction joint, screwing down transverse connecting bolts, and pouring UHPC at the reserved slot of the longitudinal bridge direction joint to complete the longitudinal joint construction;

s7: and roughening the top surface of the UHPC short rib bridge deck and paving a surface layer.

The second construction method comprises the following steps: prefabricated hoist and mount UHPC short rib decking in factory, the longitudinal bridge sets up between web or longeron to the seam connection structure, and horizontal bridge adopts pre-buried horizontal bridge to straight steel sheet to the seam connection structure, specifically includes following step:

s1: prefabricating a UHPC short rib bridge deck-steel beam combined unit in a prefabrication plant, and hoisting the UHPC short rib bridge deck to the steel beam;

s2: screwing the high-strength bolt at the position at the flange plate on the diaphragm plate to form a combined unit of the UHPC low-rib bridge deck slab and the steel beam;

s3: screwing the high-strength bolt at the position at the flange plate on the web plate or the longitudinal beam;

s4: installing a transverse connecting steel plate at the longitudinal bridge seam, and screwing a high-strength bolt at the position; pouring UHPC at the slot of the longitudinal bridge joint, and completing construction of the longitudinal bridge joint in a factory;

s5: transporting and erecting a UHPC short rib bridge deck slab-steel beam combined unit;

s6: installing a longitudinal connecting steel plate at the transverse bridge seam, and screwing the high-strength bolt at the position; pouring UHPC at the reserved notch of the transverse bridge seam to complete the construction of the transverse bridge seam;

The third construction method comprises the following steps: prefabricated hoist and mount UHPC short rib decking in factory does not have the longitudinal bridge to seam connection structure, and horizontal bridge adopts pre-buried horizontal straight steel sheet to seam connection structure, specifically includes following step:

s3: transporting and erecting a UHPC short rib bridge deck slab-steel beam combined unit;

s4: installing a longitudinal connecting steel plate at the transverse bridge seam, and screwing the high-strength bolt at the position; pouring UHPC at the reserved notch of the transverse bridge seam to complete the construction of the transverse bridge seam;

s5: and roughening the top surface of the UHPC short rib bridge deck and paving a surface layer.

According to the place for hoisting the UHPC short rib bridge panel, the form and the position of the longitudinal bridge joint connecting structure and the form and the position of the transverse bridge joint connecting structure, the construction methods can be combined according to actual conditions, and are not limited to the four construction methods.

In a traditional steel-UHPC composite bridge or a steel-common concrete composite bridge, cast-in-place joints are generally arranged at the upper flange plates of diaphragm plates or cross beams (steel beam webs or longitudinal beams), and joints are arranged at the upper flange plates of each diaphragm plate or cross beam so as to form a whole together with adjacent bridge deck units. The distance between the diaphragm plates is smaller, so that the number of seams is larger. Meanwhile, the transverse bridge seam connecting structures are located in the hogging moment area, the top surface tensile stress is high, and high cracking risks exist. The utility model discloses at the last flange board department cancellation seam system of cross slab or crossbeam, optimize the position of arranging and the arrangement mode of seam system, optimize the connected mode of the short rib decking of UHPC and lower part girder steel, adopt the thought of prefabrication in the short rib decking factory of UHPC, on-the-spot bolt, realize the prefabricated construction of assembling. Firstly, optimizing the arrangement position of a joint connection structure, and enabling a cast-in-situ UHPC connection part to be far away from a diaphragm plate or a cross beam; the UHPC short-rib bridge deck slab is prefabricated in a factory, pre-buried connecting steel components are arranged between longitudinal ribs on the bottom surface of the UHPC short-rib bridge deck slab, the longitudinal ribs between adjacent UHPC short-rib bridge deck slabs are fixedly connected through fixed connecting pieces, UHPC is cast in situ between the upper UHPC slabs to realize the connection between the adjacent UHPC short-rib bridge deck slabs, the pre-buried connecting steel components are arranged between the longitudinal ribs, and the UHPC short-rib bridge deck slab and the lower steel beam are connected through the fixed connecting pieces.

Compared with the prior art, the utility model has the advantages of:

1. the utility model discloses cancel the cast-in-place seam of diaphragm plate or crossbeam department to set up the seam connection structure that cast-in-place seam (cast-in-place UHPC connecting portion) and steel sheet bolt (pre-buried connecting steel subassembly + fixed connector) combined together between diaphragm plate or crossbeam, be connected with diaphragm plate or crossbeam upper limb flange board through the mode that adopts steel sheet bolt (pre-buried connecting steel subassembly + fixed connector), reducible seam quantity optimizes the seam department atress, the anti cracking strength of this position UHPC decking has been improved greatly, seam fracture risk is low.

2. The utility model discloses a mode of bolt joint is adopted to seam connection structure lower part, and the pouring volume between the adjacent seam is little, and seam structure department no longer leads to weight gain owing to increase thickness, and the dead weight of decking is lower, and the short rib decking of UHPC is applicable to the sensitive big bridge of striding of dead weight more.

3. The utility model discloses because seam quantity greatly reduced only reserves the notch at adjacent UHPC panel top surface to cast-in-place UHPC in the notch can, the seam structure is simplified, the size reduces greatly, thereby is showing the cast-in-place construction work load that reduces, improves the seam quality.

4. The utility model discloses a parts such as diaphragm are kept away from to seam connection structure, and the lower part adopts the bolt connection, need not position welding toggle pin such as flange plate on the diaphragm, has also simplified the construction process of girder steel, and has avoided the fatigue fracture risk because of welding the toggle pin and arouse on the girder steel.

5. The steel material has good durability as long as the surface is properly protected. The durability of the cement-based material mainly comprises impermeability, carbonization resistance, frost resistance and the like. Because UHPC material is more closely knit than ordinary concrete, "hundred poisons do not invade", its durability is usually higher than ordinary concrete an order of magnitude, thinks UHPC has the life-span of over 200 years usually, so the utility model discloses a UHPC short rib decking and steel-UHPC combination bridge have higher durability.

Generally speaking, the utility model discloses a short rib decking of UHPC and steel-UHPC combination bridge are full prefabricated component, and the short rib decking of UHPC passes through high strength bolt to be connected with the diaphragm plate crossbeam of girder steel, and avoids setting up cast-in-place seam in the hogging moment district, has seam small in quantity, seam fracture risk low, the dead weight is light, intensity is high, the assembly rate is high, the construction is simple and convenient, the quality is controllable, the durability is good, outstanding advantage such as economic nature is excellent.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a transverse bridge-direction joint of a conventional UHPC low-rib bridge deck slab-steel beam composite structure.

Fig. 2 is a schematic structural view of a longitudinal bridge joint of a conventional UHPC low-rib bridge deck slab-steel beam composite structure.

FIG. 3 is an elevation view of a UHPC low-rib bridge deck in an embodiment, wherein pre-buried deformed steel plates are adopted at the diaphragm plates, and pre-buried steel plates are adopted at the joint connection structure.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is a sectional view taken along line B-B in fig. 3.

FIG. 6 is an elevation view of a UHPC low-rib bridge deck in an embodiment, wherein a flat pre-buried steel plate is adopted at a diaphragm plate, and a pre-buried steel plate is adopted at a joint connecting structure.

Fig. 7 is a sectional view taken along line C-C in fig. 6.

FIG. 8 is an elevation view of the steel-UHPC composite bridge in the embodiment, wherein pre-buried deformed steel plates are adopted at the diaphragm plates, and pre-buried steel plates are adopted at the joint connection structure.

Fig. 9 is a sectional view taken along line D-D in fig. 8.

Fig. 10 is a sectional view taken along line E-E in fig. 8.

FIG. 11 is a three-dimensional view of the steel-UHPC composite bridge in the embodiment, and pre-buried deformed steel plates are adopted at the diaphragm plates.

FIG. 12 is a schematic structural view of the deformed steel plate in the example.

FIG. 13 is an elevation view of the steel-UHPC composite bridge in the embodiment, wherein the diaphragm plate is made of pre-embedded straight steel plates, and the joint connection structure is made of pre-embedded steel plates.

Fig. 14 is a sectional view taken along line F-F in fig. 13.

FIG. 15 is a three-dimensional view of the steel-UHPC composite bridge in the embodiment, and the transverse partition plates are made of embedded flat steel plates.

FIG. 16 is a schematic structural view of a flat steel plate in the example.

FIG. 17 is a cross-sectional view of the steel-UHPC composite bridge in the embodiment, wherein pre-buried deformed steel plates are adopted at the web plate of the steel beam, and pre-buried deformed steel plates are adopted at the joint connection structure.

Fig. 18 is a view showing a large scale at a in fig. 17.

Fig. 19 is a sectional view taken along line G-G in fig. 18.

Fig. 20 is a view showing a large scale at B in fig. 17.

Fig. 21 is a sectional view taken along line H-H in fig. 20.

FIG. 22 is a cross-sectional view of the steel-UHPC composite bridge in the embodiment, wherein the steel beam web adopts an embedded flat steel plate, and the joint connection structure adopts an embedded flat steel plate.

Fig. 23 is a view showing a view at C in fig. 22.

Fig. 24 is a sectional view taken along line I-I in fig. 23.

Fig. 25 is a view showing a view taken at point D in fig. 22.

Fig. 26 is a sectional view taken along line J-J in fig. 25.

Illustration of the drawings:

1. a UHPC panel; 2. longitudinal ribs; 3. casting a UHPC connecting part in situ; 4. a diaphragm plate; 5. a first deformed steel plate; 6. a first flat steel plate; 7. a base plate; 8. a side plate; 9. longitudinally connecting steel plates; 10. a longitudinal connecting bolt; 11. a steel beam; 13. a second deformed steel plate; 14. a second flat steel plate; 15. transversely connecting steel plates; 16. a transverse connecting bolt; 17. a rib bottom steel plate; 18. a stud; 19. a notch; 20. the upper flange plate of the diaphragm plate; 21. a third deformed steel plate; 22. a third flat steel plate; 23. a reinforcing web; 24. the diaphragm plate is connected with a bolt; 25. a web upper flange plate; 26. a fourth deformed steel plate; 27. a fourth flat steel plate; 28. web/stringer connecting bolts; 29. an asphalt pavement layer; 30. a steel beam web.

Detailed Description

To facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by an existing method.

Example (b):

as shown in fig. 1 and fig. 2, the structural diagrams of the transverse and longitudinal joints of the conventional UHPC low-rib bridge deck-steel beam composite structure are shown, respectively, and it can be seen from the diagrams that the conventional transverse and longitudinal joints are provided at the diaphragms or cross beams, and the longitudinal joints are provided at the webs or longitudinal beams.

As shown in fig. 3-17, in the joint connection structure of the UHPC short-rib bridge panel according to this embodiment, the UHPC short-rib bridge panel includes a UHPC panel 1 and longitudinal ribs 2 (which are integrally formed by prefabricating) fixedly disposed at the bottom of the UHPC panel 1, the joint connection structure is disposed between adjacent UHPC short-rib bridge panels, the joint connection structure includes a cast-in-place UHPC connection portion 3 disposed at the adjacent UHPC panel 1 and a longitudinal rib connection portion disposed at the adjacent longitudinal rib 2, the longitudinal rib connection portion includes a first pre-embedded connection steel component and a first fixed connection member for connecting the adjacent first pre-embedded connection steel component, and the first pre-embedded connection steel component is disposed on the longitudinal rib 2.

In the embodiment, the seam connection structure is a transverse bridge-direction seam connection structure; the center-to-center spacing k between the transverse bridging seam connection structure and the transverse partition plate 4 or the transverse beam closest to the transverse bridging seam connection structure is 0.2-0.5 times (in any range) the center-to-center spacing between the adjacent transverse partition plates 4 or the center-to-center spacing between the adjacent transverse partition plates 4 and the transverse beam. In the present embodiment, only the diaphragm 4 is shown.

As shown in fig. 3 to 16, in the present embodiment, the first pre-buried connecting steel assembly is a first deformed steel plate 5 (fig. 3 to 4, 6, 8 to 9, and 13) or a first flat steel plate 6 arranged in a transverse bridge direction (this situation is not shown in the drawings, and only the first deformed steel plate 5 needs to be replaced by the first flat steel plate 6); the first special-shaped steel plate 5 is pre-buried between adjacent longitudinal ribs 2 at the longitudinal end part of the UHPC low-rib bridge deck, the first special-shaped steel plate 5 comprises a bottom plate 7 and two side plates 8, the bottom plate 7 is arranged at the bottoms of the two side plates 8 and is respectively connected with the two side plates 8, and the two side plates 8 are respectively fixedly connected with the adjacent side walls of the adjacent longitudinal ribs 2 (the side plates 8 are provided with studs 18 and are connected with the side walls of the longitudinal ribs 2 through the studs 18, and the lower part is the same); the first flat steel plate 6 is pre-buried at the bottom of the longitudinal rib 2 at the longitudinal end of the UHPC low-rib bridge deck (the first flat steel plate 6 is provided with a stud 18 which is connected with the bottom of the longitudinal rib 2 through the stud 18, and the same applies below).

As shown in fig. 8-9 and 13, in this embodiment, the first fixing connector includes a longitudinal connecting steel plate 9 (for example, a steel plate with a thickness of 10 mm) and a longitudinal connecting bolt 10 (a cushion plate may be disposed at a joint of the bolt and the steel plate, the same applies below), a bolt hole matched with the longitudinal connecting bolt 10 is formed in the longitudinal connecting steel plate 9, and adjacent first pre-embedded connecting steel assemblies between adjacent longitudinal ribs 2 in the longitudinal bridge direction are connected into a whole through the longitudinal connecting steel plate 9 and the longitudinal connecting bolt 10.

In this embodiment, when the first flat steel plate 6 is provided, the rib bottom steel plate 17 at the bottom of the longitudinal rib 2 needs to be disconnected to facilitate installation of the first flat steel plate 6.

The steel-UHPC combined bridge comprises a steel beam 11 and a plurality of split type UHPC short rib bridge panels arranged on the upper portion of the steel beam 11, and the adjacent UHPC short rib bridge panels are connected into a whole in the longitudinal bridge direction through the seam connection of the UHPC short rib bridge panels. The steel beam 11 is a steel box beam without an orthotropic steel bridge deck.

In the embodiment, as shown in fig. 3 to 16, the UHPC low-rib bridge deck is connected to the diaphragm upper flange 20 of the steel beam 11 (the upper flange of the beam is not shown in the figure) by a transverse flange connector, the transverse flange connector includes a second pre-embedded connecting steel assembly and a second fixing connector for connecting the second pre-embedded connecting steel assembly and the diaphragm upper flange 20, and the second pre-embedded connecting steel assembly is disposed at the junction of the UHPC low-rib bridge deck and the diaphragm upper flange 20.

In this embodiment, the second embedded connecting steel assembly is a third deformed steel plate 21 (shown in fig. 3, 5, 8, 10, 11-12) or a third straight steel plate 22 (shown in fig. 6-7, 13-16) arranged in a transverse bridge direction; the third special-shaped steel plate 21 is pre-buried between the adjacent longitudinal ribs 2, the third special-shaped steel plate 21 comprises a bottom plate 7, a reinforcing web plate 23 and two side plates 8, the bottom plate 7 is arranged at the bottoms of the two side plates 8 and is respectively connected with the two side plates 8, the two side plates 8 are respectively fixedly connected with the adjacent side walls of the adjacent longitudinal ribs 2, and two sides of the reinforcing web plate 23 are respectively fixedly connected with the two side plates 8 and are vertically arranged in the middle of the bottom plate 7; the third flat steel plate 22 is pre-buried at the bottom of the longitudinal rib 2 of the UHPC short rib bridge panel.

As shown in fig. 11, in the present embodiment, the plane in which the reinforcing web 23 of the third deformed steel plate 21 is located and the plane in which the web of the bulkhead 4 is located are the same plane.

As shown in fig. 8 and 10-16, in this embodiment, the diaphragm plate upper flange plate 20 is provided with bolt holes, the second fixing connector includes diaphragm plate connecting bolts 24, and the second embedded connecting steel assembly and the diaphragm plate upper flange plate 20 are connected into a whole through the diaphragm plate connecting bolts 24.

In this example, the thickness of the UHPC panel 1 is 0.06-0.14m (e.g. 100 mm); the longitudinal ribs 2 are in an inverted trapezoid shape, the rib height of each longitudinal rib 2 is 0.08-0.3m (such as 140mm), the distance between every two adjacent longitudinal ribs 2 is 0.4-1.0m, the top width of each longitudinal rib 2 is 0.2-0.5m, and the bottom width is 0.15-0.4 m; the distance between the adjacent longitudinal ribs 2 is 600-1000 mm; the bottom of the vertical rib 2 is provided with a rib bottom steel plate 17, the width of the rib bottom steel plate 17 is the same as that of the bottom of the vertical rib 2, the thickness of the rib bottom steel plate 17 is 0.006-0.014m (such as 8mm), the top surface of the rib bottom steel plate 17 is provided with a bolt 18 for connecting the rib bottom steel plate 17 and the vertical rib 2 into a whole, and the height of the bolt 18 is 180 mm.

In this embodiment, the longitudinal ends of the UHPC panel 1 are each provided with a notch 19, the height of the notch 19 is 30-70% (e.g. 50mm) of the thickness of the UHPC panel 1, and the longitudinal bridging length of the notch 19 is 0.3-0.6m (e.g. 250 mm).

In this embodiment, the UHPC low-rib bridge deck and the UHPC at the joint are cast from ultra-high-performance concrete, which is concrete containing steel fibers and no coarse aggregate in the components, and having a compressive strength of not less than 100MPa and an axial tensile strength of not less than 5 MPa. And an asphalt pavement layer 29 is arranged above the ultrahigh-performance concrete layer.

The construction method of the steel-UHPC composite bridge of the present embodiment is not limited, and reference may be made to the construction method mentioned above.

In order to better understand the technical solution in the present embodiment, a longitudinal bridge seam connection structure similar to the transverse bridge seam connection structure and a connection manner of the UHPC short rib bridge deck and the web upper flange plate 25 of the steel beam 11 are also provided in the following embodiments.

As shown in fig. 17 to 26, in the longitudinal joint connection structure of the UHPC short-rib bridge panel according to this embodiment, the UHPC short-rib bridge panel includes a UHPC panel 1 and longitudinal ribs 2 (which are integrally prefabricated and formed) fixedly disposed at the bottom of the UHPC panel 1, the longitudinal joint connection structure is disposed between adjacent UHPC short-rib bridge panels in the transverse direction, the longitudinal joint connection structure includes a cast-in-place UHPC connection portion 3 disposed at the adjacent UHPC panel 1 in the transverse direction and a longitudinal rib connection portion disposed at the adjacent longitudinal ribs 2 in the transverse direction, the longitudinal rib connection portion includes a first pre-embedded connection steel component and a first fixed connection member for connecting the adjacent first pre-embedded connection steel component, and the first pre-embedded connection steel component is disposed on the longitudinal ribs 2.

In this embodiment, the center-to-center distance h between the longitudinal bridging joint connection structure and the steel beam web 30 or the longitudinal beam closest thereto is 0.2 to 0.5 times (both of) the center-to-center distance between the adjacent steel beam webs 30 or the center-to-center distance between the adjacent longitudinal beams. Only the steel beam web 30 is shown in this embodiment.

As shown in fig. 17 to 26, in the embodiment, the first embedded connecting steel assembly is a second profiled steel sheet 13 (shown in fig. 17 and 20 to 21) or a second flat steel sheet 14 (shown in fig. 22 and 25 to 26) arranged in a longitudinal bridge direction; the second special-shaped steel plate 13 is pre-buried at the transverse end part of the UHPC low-rib bridge deck, the second special-shaped steel plate 13 comprises a side plate 8 and a bottom plate 7, the bottom plate 7 is arranged at the bottom of the side plate 8 and connected with the side plate 8, and the side plate 8 is fixedly connected with the side wall of the longitudinal rib 2; the second flat steel plate 14 is pre-buried at the bottom of the longitudinal rib 2 at the transverse end of the UHPC short rib bridge deck.

In this embodiment, the second deformed steel plates 13 are arranged at equal intervals along the longitudinal bridge, and the distance between adjacent second deformed steel plates 13 is 0.5-1.5m (selected according to actual requirements, the above ranges are all available); the transverse bridge width of the second flat steel plate 14 is larger than the bottom width of the longitudinal rib 2, one side of the second flat steel plate 14 is flush with one side of the bottom of the longitudinal rib 2, and the other side of the second flat steel plate 14 extends outwards from the transverse end of the UHPC short rib bridge deck. In this embodiment, when the second flat steel plate 14 is used, the rib bottom steel plate 17 is not disposed at the bottom of the longitudinal rib 2 fixedly connected to the second flat steel plate 14, that is, the rib bottom steel plate 17 is directly widened (or thickened according to the requirement of the stress performance), so as to obtain the second flat steel plate 14. When the second flat steel plate 14 is adopted, one of the steel plates of the second flat steel plate 14 and the transverse bridge seam connection structure needs to be disconnected, so that the installation is facilitated.

As shown in fig. 20-21 and 25-26, in this embodiment, the first fixing connector includes a transverse connecting steel plate 15 and a transverse connecting bolt 16, the transverse connecting steel plate 15 is provided with a bolt hole matched with the transverse connecting bolt 16, and adjacent first pre-embedded connecting steel assemblies between adjacent longitudinal ribs 2 in the transverse direction are connected into a whole through the transverse connecting steel plate 15 and the transverse connecting bolt 16.

The steel-UHPC combined bridge comprises a steel beam 11 and a plurality of split type UHPC short rib bridge panels arranged on the upper portion of the steel beam 11, wherein the adjacent UHPC short rib bridge panels are connected into a whole in the transverse bridge direction through the longitudinal bridge direction joint connection structure of the UHPC short rib bridge panels. The steel beam 11 is a steel box beam without an orthotropic steel bridge deck.

As shown in fig. 17-19 and 22-24, in this embodiment, the UHPC short-rib bridge deck is connected to the web upper flange 25 of the steel beam 11 or the longitudinal beam upper flange by a longitudinal upper flange connector, the longitudinal upper flange connector includes a third pre-embedded connecting steel component and a third fixing connector for connecting the third pre-embedded connecting steel component and the web upper flange 25 or for connecting the third pre-embedded connecting steel component and the longitudinal beam upper flange, and the third pre-embedded connecting steel component is disposed at the junction between the UHPC short-rib bridge deck and the web upper flange 25 or the junction between the UHPC short-rib bridge deck and the longitudinal beam upper flange.

In this embodiment, the third embedded connecting steel assembly is a fourth deformed steel plate 26 (as shown in fig. 17 to 19) or a fourth straight steel plate 27 (as shown in fig. 22 to 24) arranged in the longitudinal bridge direction; the fourth special-shaped steel plate 26 is pre-buried between the adjacent longitudinal ribs 2, the fourth special-shaped steel plate 26 comprises a bottom plate 7, a reinforcing web plate 23 and two side plates 8, the bottom plate 7 is arranged at the bottoms of the two side plates 8 and is respectively connected with the two side plates 8, the two side plates 8 are respectively fixedly connected with the adjacent side walls of the adjacent longitudinal ribs 2, and two sides of the reinforcing web plate 23 are respectively welded with the two side plates 8 and are vertically arranged in the middle of the bottom plate 7; the fourth straight steel plate 27 is pre-buried at the bottom of the longitudinal rib 2 of the UHPC short rib bridge deck.

In the embodiment, the fourth deformed steel plates 26 are arranged at equal intervals along the longitudinal bridge, and the distance between adjacent fourth deformed steel plates 26 is 0.5-1.5m (selected according to actual requirements, and the above range can be adopted).

As shown in fig. 23 to 24, in the present embodiment, the lateral width of the fourth flat steel plate 27 is greater than the lateral width of the longitudinal rib 2 fixedly connected thereto, both lateral ends of the fourth flat steel plate 27 exceed both lateral ends of the longitudinal rib 2 fixedly connected thereto, and the connection point between the fourth flat steel plate 27 and the third fixed connecting member is provided at both lateral ends of the fourth flat steel plate 27. When the fourth straight steel plate 27 is adopted, the bottom of the longitudinal rib 2 fixedly connected with the fourth straight steel plate 27 is not provided with the rib bottom steel plate 17, namely the rib bottom steel plate 17 is directly widened (can be thickened according to the requirement of stress performance), and the fourth straight steel plate 27 is obtained. When the fourth flat steel plate 27 is used, one of the steel plates of the fourth flat steel plate and the horizontal bridge seam connection structure needs to be disconnected, so that the installation is facilitated.

As shown in fig. 18-19 and 23-24, in this embodiment, the web upper flange plate 25 or the longitudinal beam upper flange plate is provided with a bolt hole, the third fixing and connecting member includes a web/longitudinal beam connecting bolt 28, and the third pre-embedded connecting steel assembly and the web upper flange plate 25 or the third pre-embedded connecting steel assembly and the longitudinal beam upper flange plate are connected into a whole through the web/longitudinal beam connecting bolt 28.

Claims

1. The utility model provides a seam connection structure of UHPC short rib bridge panel, its characterized in that, UHPC short rib bridge panel include UHPC panel (1) and set firmly in vertical rib (2) of UHPC panel (1) bottom, seam connection structure locates adjacent between the UHPC short rib bridge panel, seam connection structure is including locating adjacent cast-in-place UHPC connecting portion (3) of UHPC panel (1) department and locating adjacent vertical rib connecting portion of vertical rib (2) department, vertical rib connecting portion include first pre-buried connecting steel subassembly and be used for connecting adjacent first fixed connector of first pre-buried connecting steel subassembly, first pre-buried connecting steel subassembly is located on vertical rib (2).

2. The seam connection configuration of claim 1 wherein said seam connection configuration is a cross-bridge seam connection configuration; the center spacing k between the transverse bridging seam connection structure and the transverse clapboard (4) or the transverse beam closest to the transverse bridging seam connection structure is 0.2-0.5 times of the center spacing between the adjacent transverse clapboards (4) or the center spacing between the adjacent transverse clapboards (4) and the transverse beam.

3. A seam connection construction according to claim 2, characterized in that said first pre-buried connection steel assembly is a first profiled steel sheet (5) or a first flat steel sheet (6) arranged in a transverse bridge direction; the first special-shaped steel plate (5) is pre-buried between the adjacent longitudinal ribs (2) at the longitudinal end part of the UHPC low-rib bridge deck, the first special-shaped steel plate (5) comprises a bottom plate (7) and two side plates (8), the bottom plate (7) is arranged at the bottoms of the two side plates (8) and is respectively connected with the two side plates (8), and the two side plates (8) are respectively fixedly connected with the adjacent side walls of the adjacent longitudinal ribs (2); the first flat steel plate (6) is pre-buried at the bottom of the longitudinal rib (2) at the longitudinal end of the UHPC short rib bridge deck.

4. A joint connection structure according to claim 2, wherein the first fixing connector comprises a longitudinal connecting steel plate (9) and a longitudinal connecting bolt (10), the longitudinal connecting steel plate (9) is provided with a bolt hole matched with the longitudinal connecting bolt (10), and adjacent first pre-embedded connecting steel assemblies between the longitudinal ribs (2) in the longitudinal direction are connected into a whole through the longitudinal connecting steel plate (9) and the longitudinal connecting bolt (10).

5. A seam connection construction according to any of claims 1-4, characterized in that the thickness of said UHPC panel (1) is 0.06-0.14m, that the longitudinal ends of said UHPC panel (1) are provided with notches (19), that the height of said notches (19) is 30-70% of the thickness of said UHPC panel (1), and that the longitudinal bridging length of said notches (19) is 0.3-0.6 m; the longitudinal ribs (2) are inverted trapezoids, the rib height of each longitudinal rib (2) is 0.08-0.3m, the distance between every two adjacent longitudinal ribs (2) is 0.4-1.0m, the top width of each longitudinal rib (2) is 0.2-0.5m, and the bottom width of each longitudinal rib (2) is 0.15-0.4 m; the rib bottom steel plate (17) is arranged at the bottom of the longitudinal rib (2), the width of the rib bottom steel plate (17) is the same as that of the bottom of the longitudinal rib (2), the thickness of the rib bottom steel plate (17) is 0.006-0.014m, and a stud (18) for connecting the rib bottom steel plate (17) and the longitudinal rib (2) into a whole is arranged on the top surface of the rib bottom steel plate (17).

6. A steel-UHPC combined bridge, which is characterized by comprising a steel beam (11) and a plurality of split UHPC short-rib bridge decks arranged on the upper part of the steel beam (11), wherein the adjacent UHPC short-rib bridge deck longitudinal bridges are connected into a whole through the seam connection structure of the UHPC short-rib bridge decks as claimed in any one of claims 1-5.

7. The steel-UHPC composite bridge according to claim 6, wherein the UHPC low-rib bridge deck is connected with the diaphragm plate upper flange plate (20) of the steel beam (11) or the beam upper flange plate through a transverse flange plate connecting piece, the transverse flange plate connecting piece comprises a second pre-embedded connecting steel component and a second fixed connecting piece which is used for connecting the second pre-embedded connecting steel component with the diaphragm plate upper flange plate (20) or is used for connecting the second pre-embedded connecting steel component with the beam upper flange plate, and the second pre-embedded connecting steel component is arranged at the joint of the UHPC low-rib bridge deck and the diaphragm plate upper flange plate (20) or at the joint of the UHPC low-rib bridge deck and the beam upper flange plate.

8. The steel-UHPC combined bridge beam of claim 7, wherein the second pre-buried connecting steel component is a third deformed steel plate (21) or a third flat steel plate (22) arranged in the transverse bridge direction; the third special-shaped steel plate (21) is pre-buried between the adjacent longitudinal ribs (2), the third special-shaped steel plate (21) comprises a bottom plate (7), a reinforcing web plate (23) and two side plates (8), the bottom plate (7) is arranged at the bottoms of the two side plates (8) and is respectively connected with the two side plates (8), the two side plates (8) are respectively and fixedly connected with the adjacent side walls of the adjacent longitudinal ribs (2), and two sides of the reinforcing web plate (23) are respectively and fixedly connected with the two side plates (8) and are vertically arranged in the middle of the bottom plate (7); the third flat straight steel plate (22) is pre-buried at the bottom of the longitudinal rib (2) of the UHPC short rib bridge panel.

9. The steel-UHPC composite bridge according to claim 8, wherein the plane of the reinforcing web (23) of the third deformed steel plate (21) and the plane of the web of the diaphragm plate (4) or the web of the beam are the same plane.

10. The steel-UHPC combined bridge beam as recited in any one of claims 7-9, wherein the diaphragm plate upper flange plate (20) or the beam upper flange plate is provided with bolt holes, the second fixing connector comprises a diaphragm plate connecting bolt (24), and the second pre-embedded connecting steel assembly and the diaphragm plate upper flange plate (20) or the second pre-embedded connecting steel assembly and the beam upper flange plate are connected into a whole through the diaphragm plate connecting bolt (24).