Joint connection construction of UHPC low-ribbed bridge deck and steel-UHPC composite bridge

Abstract

The present invention discloses a joint connection structure of a UHPC low-rib bridge deck, wherein the UHPC low-rib bridge deck comprises a UHPC panel and a longitudinal rib fixed to the bottom of the UHPC panel, and the joint connection structure comprises a cast-in-place UHPC connection portion provided at adjacent UHPC panels and a longitudinal rib connection portion provided at adjacent longitudinal ribs. The present invention also provides a steel-UHPC composite bridge, comprising a steel beam and a plurality of split-type UHPC low-rib bridge decks provided on the upper part of the steel beam, wherein the adjacent UHPC low-rib bridge decks are connected into a whole in the longitudinal direction of the bridge through the joint connection structure of the above-mentioned UHPC low-rib bridge decks. The joint connection structure of the present invention has outstanding advantages such as a small number of joints, a low risk of joint cracking, a light dead weight, a high strength, a high assembly rate, simple construction, controllable quality, good durability, and excellent economy.

Description

Technical Field

[0001] The invention belongs to the field of bridges, and in particular relates to a joint structure and a combined bridge. Background Art

[0002] Ultra-High Performance Concrete (UHPC, hereinafter referred to as UHPC) has the advantages of high elastic modulus, high tensile strength, good shrinkage creep characteristics and excellent durability. It can reduce the structural size, reduce the structural deadweight, and increase the spanning capacity of the bridge structure, and has a wide range of application prospects. The creep coefficient and late shrinkage of UHPC can be significantly reduced through high-temperature curing; factory prefabrication can further ensure the structural quality, reduce the amount of on-site construction work, and speed up the construction speed; and UHPC has a small cross-sectional size, which is convenient for transportation and hoisting, so UHPC structure is suitable for assembly construction.

[0003] UHPC low-rib bridge deck is a new type of bridge deck that has emerged in recent years. It is suitable for steel-UHPC composite structure bridges. Its structural characteristics are as follows: stiffening ribs are only set along the longitudinal direction of the bridge on the bottom of the deck, thereby improving the stiffness of the entire bridge deck, effectively reducing the deadweight of the bridge deck and avoiding the cracking risk commonly faced by ordinary concrete bridge decks.

[0004] The transverse joints of UHPC low-rib bridge decks are generally set at the flange plate position on the diaphragm. Under the action of local wheel loads, the joints are all in the negative bending moment zone, resulting in tension on the top surface of the joints. Due to the existence of the joints, the steel fibers that should be randomly distributed in the UHPC are "artificially" cut off at the joint section, so that no steel fibers pass through the joints, resulting in a significant reduction in the tensile strength of the UHPC at the joints, causing the cast-in-place joints to become the weak position of the UHPC layer, increasing the risk of cracking in the joint section. At the same time, this joint setting method requires joints to be set at each diaphragm (or beam) position, resulting in a large number of joints, a large amount of on-site casting work, and increased construction period and cost. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, and to provide a joint connection structure of UHPC low-rib bridge decks and steel-UHPC composite bridges with a small number of transverse joints, a small amount of cast-in-place UHPC at the joints, a low risk of cracking at the joints, and suitable for long-span bridges. In order to solve the above technical problems, the technical solutions proposed by the present invention are:

[0006] A joint connection structure of a UHPC low-rib bridge deck, the UHPC low-rib bridge deck comprises a UHPC panel and a longitudinal rib fixed to the bottom of the UHPC panel, the joint connection structure is arranged between adjacent UHPC low-rib bridge decks, the joint connection structure comprises a cast-in-place UHPC connection portion arranged at adjacent UHPC panels and a longitudinal rib connection portion arranged at adjacent longitudinal ribs (the adjacent longitudinal ribs here refer to the longitudinal ribs on different UHPC low-rib bridge decks), the longitudinal rib connection portion comprises a first embedded connection steel component and a first fixed connection piece for connecting the adjacent first embedded connection steel components, the first embedded connection steel component is arranged on the longitudinal rib. The longitudinal rib is integrally formed with the UHPC panel, and its material is also UHPC. The ends of the two adjacent UHPC panels are arranged in close proximity, and the upper half is provided with a notch for casting UHPC to form a cast-in-place UHPC connection portion. The joint connection structure is that the upper half adopts cast-in-place UHPC, and the lower half is connected by a fastening component. The UHPC low-rib bridge deck is prefabricated in the factory, and only longitudinal and transverse steel bars are arranged in the UHPC deck. The diameter of the steel bars is preferably 0.014-0.024m.

[0007] In the above-mentioned joint connection structure, preferably, the joint connection structure is a transverse bridge joint connection structure; the center distance k between the transverse bridge joint connection structure and the closest transverse partition or beam is 0.2-0.5 times the center distance between adjacent transverse partitions or the center distance between adjacent transverse partitions and beams, so as to ensure that the transverse bridge joint connection structure is arranged in the positive bending moment zone between adjacent transverse partitions or between adjacent transverse partitions or beams, avoid tension on the top surface of the cast-in-place joint, which is beneficial to ensure the crack resistance of the joint, thereby greatly reducing the risk of cracking of the cast-in-place joint. The above-mentioned limitation on the position of the transverse bridge joint structure makes the transverse bridge joint structure away from the transverse partition or the beam, and the spacing between the transverse bridge center line of the transverse bridge joint structure and the transverse bridge center line of the transverse partition closest to it is k, or the spacing between the transverse bridge center line of the transverse bridge joint structure and the transverse bridge center line of the beam closest to it is k, and the transverse bridge center spacing between adjacent transverse partitions or the transverse bridge center spacing between adjacent transverse partitions and beams is m. At this time, k is 0.2-0.5 times of m.

[0008] In the above-mentioned joint connection structure, preferably, the first embedded connection steel component is a first special-shaped steel plate or a first straight steel plate arranged in the transverse direction of the bridge (the width is 0.03-0.06m, and the width of the third straight steel plate may be the same); the first special-shaped steel plate is embedded between the adjacent longitudinal ribs at the longitudinal ends (i.e., the two ends in the longitudinal direction) of the UHPC short-rib bridge deck (the adjacent longitudinal ribs here refer to the longitudinal ribs on the same UHPC short-rib bridge deck), the first special-shaped steel plate includes a bottom plate and two side plates, the bottom plate is arranged at the bottom of the two side plates and is respectively connected to the two side plates, and the two side plates are respectively fixed to the adjacent side walls of the adjacent longitudinal ribs by bolts; the first straight steel plate is embedded at the bottom of the longitudinal ribs at the longitudinal ends of the UHPC short-rib bridge deck. The shape of the above-mentioned side plates and bottom plates after being combined is the same as the shape of the inner cavity between the adjacent longitudinal ribs. The above-mentioned first special-shaped steel plate is provided in plurality (a plurality of which are arranged in the transverse direction of the bridge), and is provided between every two adjacent longitudinal ribs, and the bottom surface of the first special-shaped steel plate is preferably provided flush with the bottom of the longitudinal rib. The above-mentioned side plate is provided with a plurality of bolts for connecting with the side walls of the longitudinal rib. Bolt holes are evenly provided on the bottom plate for matching with the longitudinal connecting steel plates and the longitudinal connecting bolts. The first straight steel plate is provided with a plurality of bolts at corresponding positions at the bottom of the longitudinal rib for connecting with the bottom of the longitudinal rib. Preferably, the outer end of the first straight steel plate is flush with the longitudinal end of the UHPC low-rib bridge deck, and bolt holes are also evenly provided on the first straight steel plate for matching with the longitudinal connecting steel plates and the longitudinal connecting bolts, and the bolt holes are provided between adjacent longitudinal ribs.

[0009] In the above-mentioned joint connection structure, preferably, the first fixed connection member includes a longitudinal connection steel plate and a longitudinal connection bolt, the longitudinal connection steel plate is provided with a bolt hole matching the longitudinal connection bolt, and the adjacent first embedded connection steel components between the adjacent longitudinal ribs in the longitudinal bridge direction are connected into a whole through the longitudinal connection steel plate and the longitudinal connection bolt. Bolt holes are provided on the bottom surface of the above-mentioned first special-shaped steel plate or the first straight steel plate, and the bolt holes correspond to the positions of the bolt holes on the longitudinal connection steel plate. By placing the longitudinal connection steel plate between the bottom plates of adjacent first special-shaped steel plates or between adjacent first straight steel plates, the adjacent first special-shaped steel plates or first straight steel plates can be connected by the longitudinal connection bolts.

[0010] In the above-mentioned joint connection structure, the first embedded connecting steel components at the longitudinal ribs at the longitudinal ends of adjacent UHPC short-rib bridge decks can be both set as the first special-shaped steel plate or the first straight steel plate, or one of them can be set as the first special-shaped steel plate and the other as the first straight steel plate, as long as the lower longitudinal ribs of adjacent UHPC short-rib bridge decks can be connected by the first fixed connector. When the first straight steel plate is used, the rib bottom steel plate at the bottom of the longitudinal rib needs to be disconnected at the first straight steel plate to facilitate the installation of the first straight steel plate.

[0011] In the above-mentioned joint connection structure, preferably, the thickness of the UHPC panel is 0.06-0.14m, and a notch is provided at the longitudinal end of the UHPC panel, the height of the notch is 30-70% of the thickness of the UHPC panel, and the longitudinal bridge length of the notch is 0.3-0.6m. The presence of the notch increases the contact range between the joint UHPC and the UHPC panel, and avoids the low tensile strength and premature cracks at the joint due to the discontinuity of steel fibers at the interface between the new and old UHPC. The longitudinal rib is in an inverted trapezoidal shape, the rib height of the longitudinal rib is 0.08-0.3m, the spacing between adjacent longitudinal ribs is 0.4-1.0m, the top width of the longitudinal rib is 0.2-0.5m, and the bottom width is 0.15-0.4m; a rib bottom steel plate is provided at the bottom of the longitudinal rib, the rib bottom steel plate is the same width as the bottom width 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 bolts for connecting the rib bottom steel plate and the longitudinal rib into a whole. The rib bottom steel plate is prefabricated simultaneously with the prefabricated UHPC low-rib bridge deck, and long bolts are installed on the rib bottom steel plate to facilitate the connection between the rib bottom steel plate and the longitudinal rib. The diameter of the long bolt is 0.016-0.025m, and the length ensures that the net protective layer thickness is not less than 20mm.

[0012] In the above-mentioned joint connection structure, when the transverse dimension of the UHPC bridge deck is appropriate and convenient for full-width prefabrication, it is not necessary to set up a longitudinal bridge joint connection structure. The specific situation depends on the engineering requirements.

[0013] As a general technical concept, the present invention also provides a steel-UHPC composite bridge, comprising a steel beam and a plurality of split UHPC low-rib bridge decks arranged on the upper part of the steel beam, wherein the adjacent UHPC low-rib bridge decks are connected into a whole in the longitudinal direction of the bridge by the joint connection structure of the UHPC low-rib bridge decks (i.e., the transverse bridge joints adopt the above-mentioned joint connection structure). The above-mentioned steel beam is a steel plate beam, steel box beam, PK steel beam or steel truss beam without orthotropic steel bridge deck. The spacing between the diaphragms can preferably be 3.0-5.0m.

[0014] In the above-mentioned steel-UHPC composite bridge, preferably, the UHPC low-rib bridge deck is connected to the diaphragm upper flange plate of the steel beam or the beam upper flange plate through a transverse upper flange plate connector, and the transverse upper flange plate connector includes a second embedded connecting steel component and a second fixed connecting component for connecting the second embedded connecting steel component and the diaphragm flange plate, or for connecting the second embedded connecting steel component and the beam upper flange plate, and the second embedded connecting steel component is arranged at the intersection of the UHPC low-rib bridge deck and the diaphragm upper flange plate or at the intersection of the UHPC low-rib bridge deck and the beam upper flange plate.

[0015] In the above steel-UHPC composite 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 direction of the bridge; the third special-shaped steel plate is embedded between adjacent longitudinal ribs, and the third special-shaped steel plate includes a bottom plate, a reinforcing web and two side plates, the bottom plate is arranged at the bottom of the two side plates and is respectively connected to the two side plates, the two side plates are respectively fixed to the adjacent side walls of the adjacent longitudinal ribs, the two sides of the reinforcing web are respectively fixed to the two side plates (such as welding) and are vertically arranged in the middle of the bottom plate; the third straight steel plate is embedded in the bottom of the longitudinal rib of the UHPC short rib bridge deck. The shape of the above side plates, bottom plates and reinforcing webs after combination is the same as the shape of the inner cavity between adjacent longitudinal ribs. The above third special-shaped steel plates are provided in plurality (multiple arranged in the transverse direction of the bridge), and are arranged between every two adjacent longitudinal ribs, and the bottom surface of the third special-shaped steel plate is preferably arranged flush with the bottom of the longitudinal rib. The above-mentioned side plates are provided with a plurality of bolts for connecting with the side walls of the longitudinal ribs. Bolt holes are evenly provided on the bottom plate for cooperating with the connecting bolts of the diaphragm to connect the third special-shaped steel plate and the flange plate on the diaphragm (or the flange plate on the beam) into a whole. The third straight steel plate is provided with a plurality of bolts at the corresponding positions at the bottom of the longitudinal ribs for connecting with the bottom of the longitudinal ribs. Bolt holes are also evenly provided on the third straight steel plate for cooperating with the connecting bolts of the diaphragm to connect the third straight steel plate and the flange plate on the diaphragm (or the flange plate on the beam) into a whole. The bolt holes can be provided between adjacent longitudinal ribs. When the third straight steel plate is used, the rib bottom steel plate at the bottom of the longitudinal rib needs to be disconnected at the third straight steel plate to facilitate the installation of the third straight steel plate.

[0016] In the above steel-UHPC composite bridge, preferably, the plane where the reinforcing web of the third special-shaped steel plate is located is the same plane as the web of the diaphragm or the web of the cross beam. The above arrangement can avoid the large gap between the UHPC short-rib bridge deck and the upper flange of the diaphragm or the upper flange of the cross beam under the action of local wheels, thereby preventing excessive deformation and stress.

[0017] In the above-mentioned steel-UHPC composite bridge, preferably, bolt holes are provided on the flange plate on the diaphragm or the flange plate on the beam, the second fixed connection member includes a diaphragm connection bolt, and the second embedded connection steel component and the flange plate on the diaphragm or the second embedded connection steel component and the flange plate on the beam are connected as a whole through the diaphragm connection bolt. Bolt holes are provided on the bottom surface of the above-mentioned third special-shaped steel plate or the third straight steel plate, and the bolt holes correspond to the bolt hole positions on the flange plate on the diaphragm (or the flange plate on the beam). The second embedded connection steel component and the flange plate on the diaphragm (or the flange plate on the beam) can be connected as a whole through the diaphragm connection bolt, that is, the transverse bridge connection of the UHPC short-rib bridge deck and the lower steel beam is realized.

[0018] The longitudinal connecting bolts and transverse diaphragm connecting bolts mentioned above are evenly arranged. The number and spacing of the bolts depend on the shear and tensile strength requirements of the steel-UHPC interface. The bolts are preferably friction-type high-strength bolts. A pad can be set at the contact between the bolts and each steel plate.

[0019] The above-mentioned UHPC low-rib bridge deck is prefabricated in the factory, and its installation can be done in the factory to form a steel-UHPC composite beam segment with the steel beam segment, or after the on-site steel beam is erected, the UHPC low-rib bridge deck is hoisted on-site to complete the bridge deck construction. The top surface of the UHPC low-rib bridge deck is roughened by shot blasting and other methods, and an asphalt or resin surface layer is laid.

[0020] The present invention also provides the following construction method of the joint connection structure and the steel-UHPC composite bridge:

[0021] The first construction method is to hoist the UHPC low-rib bridge deck on site, set the longitudinal bridge joint connection structure between the web or the longitudinal beam, and use the pre-buried special-shaped steel plate for the transverse bridge joint connection structure, which specifically includes the following steps:

[0022] S1: erecting steel beams;

[0023] S2: Install UHPC low-rib bridge deck units on steel beams;

[0024] S3: Position and install the UHPC short-rib bridge deck unit, and tighten the high-strength bolts at the bolt holes between the UHPC short-rib bridge deck unit and the flange plate on the diaphragm;

[0025] S4: Place the longitudinal connecting steel plate at the transverse joint and tighten the high-strength bolts at this position; pour UHPC at the reserved notch of the transverse joint to complete the construction of the transverse joint;

[0026] S5: Tighten the high-strength bolts at the bolt holes between the UHPC short-rib bridge deck unit and the web or the upper flange plate of the longitudinal beam;

[0027] S6: Install the transverse connecting steel plate at the longitudinal bridge joint and tighten the transverse connecting bolts, pour the UHPC at the reserved notch of the longitudinal bridge joint, and complete the longitudinal joint construction;

[0028] S7: Roughen the top surface of the UHPC low-rib bridge deck and lay the surface layer.

[0029] The second construction method is to prefabricate and hoist the UHPC low-rib bridge deck in the factory, with the longitudinal bridge joint connection structure set between the webs or longitudinal beams, and the transverse bridge joint connection structure using pre-buried transverse straight steel plates, which specifically includes the following steps:

[0030] S1: Prefabricate the UHPC low-rib bridge deck-steel beam combination unit in the prefabrication plant and hoist the UHPC low-rib bridge deck onto the steel beam;

[0031] S2: Tighten the high-strength bolts at the flange plate of the diaphragm to form a combined unit of UHPC low-rib bridge deck and steel beam;

[0032] S3: Tighten the high-strength bolts at the web or the upper flange plate of the longitudinal beam;

[0033] S4: Install the transverse connecting steel plate at the longitudinal bridge joint and tighten the high-strength bolts at this position; pour the UHPC at the longitudinal bridge joint notch and complete the longitudinal bridge joint construction in the factory;

[0034] S5: Transport and erect the UHPC low-rib bridge deck-steel beam combination unit;

[0035] S6: Install the longitudinal connecting steel plate at the transverse bridge joint and tighten the high-strength bolts at this position; pour UHPC at the reserved notch of the transverse bridge joint to complete the transverse bridge joint construction;

[0036] S7: Roughen the top surface of the UHPC low-rib bridge deck and lay the surface layer.

[0037] The third construction method is to prefabricate and hoist the UHPC low-rib bridge deck in the factory, without longitudinal bridge joint connection structure, and the transverse bridge joint connection structure adopts pre-buried transverse straight steel plates, which specifically includes the following steps:

[0038] S1: Prefabricate the UHPC low-rib bridge deck-steel beam combination unit in the prefabrication plant and hoist the UHPC low-rib bridge deck onto the steel beam;

[0039] S2: Tighten the high-strength bolts at the flange plate of the diaphragm to form a combined unit of UHPC low-rib bridge deck and steel beam;

[0040] S3: Transport and erect the UHPC low-rib bridge deck-steel beam combination unit;

[0041] S4: Install the longitudinal connecting steel plate at the transverse bridge joint and tighten the high-strength bolts at this position; pour UHPC at the reserved notch of the transverse bridge joint to complete the transverse bridge joint construction;

[0042] S5: Roughen the top surface of the UHPC low-rib bridge deck and lay the surface layer.

[0043] According to the location of hoisting UHPC low-rib bridge deck, the form and position of the longitudinal bridge joint connection structure, and the form and position of the transverse bridge joint connection structure, the above construction methods can be combined according to actual conditions and are not limited to the above four construction methods.

[0044] In traditional steel-UHPC composite bridges or steel-ordinary concrete composite bridges, cast-in-place joints are generally set at the upper flange plates of diaphragms or beams (steel beam webs or longitudinal beams), and joints are set at the upper flange plates of each diaphragm or beam to form a whole with adjacent bridge deck units. Since the spacing between diaphragms is small, the number of joints is large. At the same time, the transverse bridge joint connection structures are all located in the negative bending moment area, the top surface tensile stress is high, and there is a high risk of cracking. The present invention eliminates the joint system at the upper flange plate of the diaphragm or beam, optimizes the layout position and layout method of the joint system, optimizes the connection method between the UHPC low-rib bridge deck and the lower steel beam, and adopts the idea of ​​prefabrication of the UHPC low-rib bridge deck in the factory and bolting on site to realize assembly construction. First, the layout of the joint connection structure is optimized to keep the cast-in-place UHPC connection away from the diaphragm or beam. The UHPC low-rib bridge deck is prefabricated in the factory, and embedded connecting steel components are set between the longitudinal ribs on the bottom surface. The longitudinal ribs between adjacent UHPC low-rib bridge decks are fixedly connected by fixed connectors. Then, UHPC is cast-in-place between the upper UHPC panels to achieve the connection between adjacent UHPC low-rib bridge decks. Then, embedded connecting steel components are set between the longitudinal ribs, and the UHPC low-rib bridge deck and the lower steel beam are connected by fixed connectors.

[0045] Compared with the prior art, the advantages of the present invention are:

[0046] 1. The present invention eliminates the cast-in-place joints at the diaphragm or beam, and arranges a joint connection structure combining a cast-in-place joint (cast-in-place UHPC connection part) and a steel plate bolt connection (embedded connection steel component + fixed connection piece) between the diaphragm or beam. By adopting the steel plate bolt connection (embedded connection steel component + fixed connection piece) to connect with the diaphragm or the upper flange plate of the beam, the number of joints can be reduced, the stress at the joint can be optimized, the crack resistance of the UHPC bridge deck at this position is greatly improved, and the risk of joint cracking is low.

[0047] 2. The lower part of the joint connection structure of the present invention is bolted, the casting amount between adjacent joints is small, the weight of the joint structure is no longer increased due to the increase in thickness, the deadweight of the bridge deck is lower, and the UHPC low-rib bridge deck is more suitable for large-span bridges that are sensitive to deadweight.

[0048] 3. Since the number of joints is greatly reduced in the present invention, only notches are reserved on the top surfaces of adjacent UHPC panels, and UHPC is cast in the notches. The joint structure is simplified and the size is greatly reduced, thereby significantly reducing the workload of on-site casting construction and improving the quality of the joints.

[0049] 4. The joint connection structure of the present invention is far away from components such as diaphragms, and the lower part is bolted, so there is no need to weld studs on the flange plate and other positions on the diaphragm, which also simplifies the construction process of the steel beam and avoids the risk of fatigue cracking caused by welding studs on the steel beam.

[0050] 5. Steel itself has good durability as long as the surface is properly protected. The durability of cement-based materials mainly includes impermeability, carbonation resistance, frost resistance, etc. Since UHPC materials are denser than ordinary concrete and "immune to all poisons", their durability is usually one order of magnitude higher than ordinary concrete. It is generally believed that UHPC has a lifespan of more than 200 years. Therefore, the UHPC low-rib bridge deck and steel-UHPC composite bridge of the present invention have higher durability.

[0051] In general, the UHPC low-rib bridge deck and the steel-UHPC composite bridge of the present invention are fully prefabricated components. The UHPC low-rib bridge deck is connected to the diaphragm beam of the steel beam by high-strength bolts, and cast-in-place joints are avoided in the negative bending moment zone. It has the outstanding advantages of a small number of joints, a low risk of joint cracking, light weight, high strength, high assembly rate, simple construction, controllable quality, good durability, and excellent economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 This is a schematic diagram of the structure of the transverse joint of the traditional UHPC low-rib bridge deck-steel beam composite structure.

[0054] Figure 2 This is a schematic diagram of the structure of the traditional UHPC low-rib bridge deck-steel beam composite structure at the longitudinal bridge joint.

[0055] Figure 3 This is an elevation view of the UHPC low-rib bridge deck in the embodiment. Pre-embedded special-shaped steel plates are used at the diaphragms, and pre-embedded shaped steel plates are used at the joint connection structures.

[0056] Figure 4 for Figure 3 AA section view in.

[0057] Figure 5 for Figure 3 BB section view in.

[0058] Figure 6 This is an elevation view of the UHPC low-rib bridge deck in the embodiment. Pre-buried straight steel plates are used at the diaphragms, and pre-buried shaped steel plates are used at the joint connection structures.

[0059] Figure 7 for Figure 6 CC section view in .

[0060] Figure 8 This is the elevation view of the steel-UHPC composite bridge in the embodiment. Pre-embedded special-shaped steel plates are used at the diaphragms, and pre-embedded shaped steel plates are used at the joint connection structures.

[0061] Fig. 9 for Figure 8 DD section view in.

[0062] Fig.10 for Figure 8 EE cross-sectional view in.

[0063] Fig.11 This is a three-dimensional diagram of the steel-UHPC composite bridge in the embodiment, where pre-embedded special-shaped steel plates are used at the diaphragms.

[0064] Fig.12 Schematic diagram of the structure of the special-shaped steel plate in the embodiment.

[0065] Fig.13 This is the elevation view of the steel-UHPC composite bridge in the embodiment. Pre-buried straight steel plates are used at the diaphragms, and pre-buried shaped steel plates are used at the joint connection structures.

[0066] Fig.14 for Fig.13 FF cross-sectional view in.

[0067] Fig.15 This is a three-dimensional diagram of the steel-UHPC composite bridge in the embodiment, where pre-buried straight steel plates are used at the diaphragms.

[0068] Fig.16 Schematic diagram of the structure of the straight steel plate in the embodiment.

[0069] Fig.17 This is a cross-sectional view of the steel-UHPC composite bridge in the embodiment. Pre-embedded special-shaped steel plates are used at the web of the steel beam and at the joint connection structure.

[0070] Fig.18 for Fig.17 A large-scale drawing of point A in the figure.

[0071] Fig.19 for Fig.18 GG section view in .

[0072] Fig. 20 for Fig.17 Large-scale drawing of point B in the figure.

[0073] Fig.21 for Fig. 20 HH section view in.

[0074] Fig. 22This is a cross-sectional view of the steel-UHPC composite bridge in the embodiment. Pre-buried straight steel plates are used at the web of the steel beam, and pre-buried straight steel plates are used in the joint connection structure.

[0075] Fig.23 for Fig. 22 Large-scale drawing of point C in the figure.

[0076] Fig.24 for Fig.23 Section II in the figure.

[0077] Fig.25 for Fig. 22 The large-scale drawing of point D in the figure.

[0078] Fig.26 for Fig.25 JJ cross-section diagram in .

[0079] Legend:

[0080] 1. UHPC panel; 2. Longitudinal rib; 3. Cast-in-place UHPC connection; 4. Diaphragm; 5. First special-shaped steel plate; 6. First straight steel plate; 7. Bottom plate; 8. Side plate; 9. Longitudinal connecting steel plate; 10. Longitudinal connecting bolts; 11. Steel beam; 13. Second special-shaped steel plate; 14. Second straight steel plate; 15. Transverse connecting steel plate; 16. Transverse connecting bolts; 17. Rib bottom steel plate; 18. Studs; 19. Notches; 20. Flange plate on diaphragm; 21. Third special-shaped steel plate; 22. Third straight steel plate; 23. Strengthening web; 24. Diaphragm connecting bolts; 25. Flange plate on web; 26. Fourth special-shaped steel plate; 27. Fourth straight steel plate; 28. Web / longitudinal beam connecting bolts; 29. ​​Asphalt pavement; 30. Steel beam web. DETAILED DESCRIPTION

[0081] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0082] Unless otherwise defined, all the professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0083] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0084] Example:

[0085] like Figure 1 and Figure 2As shown in the figure, they are schematic diagrams of the transverse bridge joints and longitudinal bridge joints of the traditional UHPC low-rib bridge deck-steel beam composite structure. It can be seen from the figure that the traditional transverse bridge joints are set at the transverse diaphragm or the cross beam, and the longitudinal bridge joints are set at the web or the longitudinal beam.

[0086] like Figure 3-Figure 17 As shown, the joint connection structure of the UHPC low-rib bridge deck of this embodiment, the UHPC low-rib bridge deck includes a UHPC panel 1 and a longitudinal rib 2 fixed to the bottom of the UHPC panel 1 (the two are prefabricated in one piece), the joint connection structure is arranged between adjacent UHPC low-rib bridge decks, the joint connection structure includes a cast-in-place UHPC connection part 3 arranged at the adjacent UHPC panel 1 and a longitudinal rib connection part arranged at the adjacent longitudinal rib 2, the longitudinal rib connection part includes a first embedded connection steel component and a first fixed connection piece for connecting adjacent first embedded connection steel components, and the first embedded connection steel component is arranged on the longitudinal rib 2.

[0087] In this embodiment, the joint connection structure is a transverse bridge joint connection structure; the center distance k between the transverse bridge joint connection structure and the nearest transverse partition 4 or beam is 0.2-0.5 times (the above ranges are all acceptable) the center distance between adjacent transverse partitions 4 or the center distance between adjacent transverse partitions 4 and beams. In this embodiment, only the case of transverse partitions 4 is shown.

[0088] like Figure 3-16 As shown, in this embodiment, the first embedded connecting steel component is a first special-shaped steel plate 5 ( Figure 3-4 , 6, 8-9, 13) or a first straight steel plate 6 arranged in the transverse direction of the bridge (this situation is not shown in the attached drawings, and it is only necessary to replace the first special-shaped steel plate 5 with the first straight steel plate 6); the first special-shaped steel plate 5 is pre-embedded between adjacent longitudinal ribs 2 at the longitudinal end of the UHPC short-rib bridge deck, and the first special-shaped steel plate 5 includes a bottom plate 7 and two side plates 8, the bottom plate 7 is arranged at the bottom of the two side plates 8 and is respectively connected to the two side plates 8, and the two side plates 8 are respectively fixed to adjacent side walls of adjacent longitudinal ribs 2 (bolts 18 are arranged on the side plates 8, which are connected to the side walls of the longitudinal ribs 2 through the bolts 18, the same below); the first straight steel plate 6 is pre-embedded at the bottom of the longitudinal rib 2 at the longitudinal end of the UHPC short-rib bridge deck (bolts 18 are arranged on the first straight steel plate 6, which are connected to the bottom of the longitudinal rib 2 through the bolts 18, the same below).

[0089] like Figure 8-9 As shown in Figures 13, in this embodiment, the first fixed connecting member includes a longitudinal connecting steel plate 9 (such as a 10 mm thick steel plate) and a longitudinal connecting bolt 10 (a pad can be provided at the connection between the bolt and the steel plate, the same below), and bolt holes matching the longitudinal connecting bolts 10 are provided on the longitudinal connecting steel plate 9. The adjacent first embedded connecting steel components between the 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 bolts 10.

[0090] In this embodiment, when the first straight 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 the installation of the first straight steel plate 6 .

[0091] The steel-UHPC composite bridge of this embodiment includes a steel beam 11 and a plurality of split UHPC low-rib bridge decks arranged on the upper part of the steel beam 11. Adjacent UHPC low-rib bridge decks are connected into a whole in the longitudinal direction of the bridge through the joint connection structure of the UHPC low-rib bridge decks. The steel beam 11 is a steel box beam without the orthotropic steel bridge deck.

[0092] like Figure 3-16 As shown, in this embodiment, the UHPC low-rib bridge deck is connected to the upper flange plate 20 on the diaphragm of the steel beam 11 (the upper flange plate of the beam is not shown in the figure) through a transverse upper flange plate connector, and the transverse upper flange plate connector includes a second embedded connecting steel component and a second fixed connecting component for connecting the second embedded connecting steel component and the flange plate 20 on the diaphragm, and the second embedded connecting steel component is arranged at the intersection of the UHPC low-rib bridge deck and the flange plate 20 on the diaphragm.

[0093] In this embodiment, the second embedded connecting steel component is a third special-shaped steel plate 21 (such as Figure 3 , 5 , 8, 10, 11-12) or a third straight steel plate 22 arranged in the transverse direction of the bridge (as shown in Figure 6-7 , 13-16); the third special-shaped steel plate 21 is embedded between adjacent longitudinal ribs 2, and the third special-shaped steel plate 21 includes a bottom plate 7, a reinforcing web 23 and two side plates 8, the bottom plate 7 is arranged at the bottom of the two side plates 8 and is respectively connected to the two side plates 8, the two side plates 8 are respectively fixed to the adjacent side walls of the adjacent longitudinal ribs 2, and the two sides of the reinforcing web 23 are respectively fixed to the two side plates 8 and are vertically arranged in the middle of the bottom plate 7; the third straight steel plate 22 is embedded in the bottom of the longitudinal rib 2 of the UHPC low-rib bridge deck.

[0094] like Fig.11 As shown, in this embodiment, the plane where the reinforcing web 23 of the third special-shaped steel plate 21 is located and the plane where the web of the diaphragm 4 is located are the same plane.

[0095] like Figure 8 , 10 -16, in this embodiment, bolt holes are opened on the flange plate 20 of the diaphragm, the second fixed connecting member includes a diaphragm connecting bolt 24, and the second embedded connecting steel component and the flange plate 20 of the diaphragm are connected into a whole through the diaphragm connecting bolt 24.

[0096] In this embodiment, the thickness of the UHPC panel 1 is 0.06-0.14m (e.g., 100mm); the longitudinal rib 2 is an inverted trapezoid, the rib height of the longitudinal rib 2 is 0.08-0.3m (e.g., 140mm), the spacing between adjacent longitudinal ribs 2 is 0.4-1.0m, the top width of the longitudinal rib 2 is 0.2-0.5m, and the bottom width is 0.15-0.4m; the spacing between adjacent longitudinal ribs 2 is 600-1000mm; a rib bottom steel plate 17 is provided at the bottom of the longitudinal rib 2, the rib bottom steel plate 17 is the same width as the bottom width of the longitudinal rib 2, the thickness of the rib bottom steel plate 17 is 0.006-0.014m (e.g., 8mm), and 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 longitudinal rib 2 into a whole, and the height of the bolt 18 is 180mm.

[0097] In this embodiment, the longitudinal ends of the UHPC panel 1 are provided with notches 19, the height of the notches 19 is 30-70% (eg 50 mm) of the thickness of the UHPC panel 1, and the longitudinal length of the notches 19 is 0.3-0.6 m (eg 250 mm).

[0098] In this embodiment, the UHPC low-rib bridge deck and the UHPC at the joints are cast by ultra-high performance concrete, which refers to concrete containing steel fibers and no coarse aggregate, with a compressive strength of not less than 100 MPa and an axial tensile strength of not less than 5 MPa. An asphalt pavement layer 29 is provided above the ultra-high performance concrete layer.

[0099] The construction method of the above-mentioned steel-UHPC composite bridge in this embodiment is not limited, and reference may be made to the construction method mentioned above.

[0100] In order to better understand the technical solution in this embodiment, a longitudinal bridge joint connection structure similar to the transverse bridge joint connection structure and a connection method between the UHPC low-rib bridge deck and the flange plate 25 on the web of the steel beam 11 are also provided in this embodiment below.

[0101] like Figure 17-Figure 26 As shown, the longitudinal bridge joint connection structure of the UHPC low-rib bridge deck of this embodiment, the UHPC low-rib bridge deck includes a UHPC panel 1 and a longitudinal rib 2 fixed to the bottom of the UHPC panel 1 (the two are prefabricated in one piece), the longitudinal bridge joint connection structure is arranged between adjacent UHPC low-rib bridge decks in the transverse direction, the longitudinal bridge joint connection structure includes a cast-in-place UHPC connection part 3 arranged at the adjacent UHPC panels 1 in the transverse direction and a longitudinal rib connection part arranged at the adjacent longitudinal rib 2 in the transverse direction, the longitudinal rib connection part includes a first pre-embedded connection steel component and a first fixed connection piece for connecting adjacent first pre-embedded connection steel components, and the first pre-embedded connection steel component is arranged on the longitudinal rib 2.

[0102] In this embodiment, the center distance h between the longitudinal bridge joint connection structure and the steel beam web 30 or the longitudinal beam closest thereto is 0.2-0.5 times (any of the above ranges) the center distance between adjacent steel beam webs 30 or the center distance between adjacent longitudinal beams. In this embodiment, only the case of the steel beam web 30 is shown.

[0103] like Figure 17-26 As shown, in this embodiment, the first embedded connecting steel component is a second special-shaped steel plate 13 (such as Fig.17 , 20 -21) or a second straight steel plate 14 arranged in the longitudinal direction (as shown in Fig. 22 , 25 -26); the second special-shaped steel plate 13 is pre-embedded in the transverse end of the UHPC low-rib bridge deck, the second special-shaped steel plate 13 includes 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 to the side plate 8, and the side plate 8 is fixedly connected to the side wall of the longitudinal rib 2; the second straight steel plate 14 is pre-embedded in the bottom of the longitudinal rib 2 at the transverse end of the UHPC low-rib bridge deck.

[0104] In this embodiment, the second special-shaped steel plates 13 are arranged at equal intervals along the longitudinal bridge, and the spacing between adjacent second special-shaped steel plates 13 is 0.5-1.5m (selected according to actual needs, the above range is acceptable); the transverse width of the second straight steel plate 14 is greater than the bottom width of the longitudinal rib 2, one side of the second straight steel plate 14 is flush with one side of the bottom of the longitudinal rib 2, and the other side of the second straight steel plate 14 extends outward from the transverse end of the UHPC low-rib bridge deck. In this embodiment, when the second straight steel plate 14 is used, the bottom of the longitudinal rib 2 fixedly connected to the second straight steel plate 14 is not provided with a rib bottom steel plate 17, which is equivalent to directly widening the rib bottom steel plate 17 (it can also be thickened according to the requirements of the force performance), that is, obtaining the second straight steel plate 14. When the second straight steel plate 14 is used, one of the steel plates of the second straight steel plate 14 and the transverse bridge joint connection structure needs to be disconnected to facilitate installation.

[0105] like Figure 20-21 As shown in Figures 25-26, in this embodiment, the first fixed connecting member includes a transverse connecting steel plate 15 and a transverse connecting bolt 16. The transverse connecting steel plate 15 is provided with bolt holes matching the transverse connecting bolts 16. The adjacent first embedded connecting steel components between the adjacent longitudinal ribs 2 in the transverse bridge direction are connected into a whole through the transverse connecting steel plate 15 and the transverse connecting bolts 16.

[0106] The steel-UHPC composite bridge of this embodiment includes a steel beam 11 and a plurality of split UHPC low-rib bridge decks arranged on the upper part of the steel beam 11. Adjacent UHPC low-rib bridge decks are connected into a whole in the transverse direction of the bridge by the longitudinal joint connection structure of the UHPC low-rib bridge decks. The steel beam 11 is a steel box beam without the orthotropic steel bridge deck.

[0107] like Figure 17-19 As shown in 22-24, in this embodiment, the UHPC low-rib bridge deck is connected to the web upper flange plate 25 of the steel beam 11 or the longitudinal beam upper flange plate through a longitudinal upper flange plate connector. The longitudinal upper flange plate connector includes a third embedded connecting steel component and a third fixed connecting component for connecting the third embedded connecting steel component and the web upper flange plate 25, or for connecting the third embedded connecting steel component and the longitudinal beam upper flange plate. The third embedded connecting steel component is arranged at the intersection of the UHPC low-rib bridge deck and the web upper flange plate 25 or at the intersection of the UHPC low-rib bridge deck and the longitudinal beam upper flange plate.

[0108] In this embodiment, the third embedded connecting steel component is a fourth special-shaped steel plate 26 (such as Figure 17-19 As shown) or the fourth straight steel plate 27 arranged in the longitudinal direction of the bridge (as shown Figure 22-24 As shown); the fourth special-shaped steel plate 26 is pre-buried between adjacent longitudinal ribs 2, and the fourth special-shaped steel plate 26 includes a bottom plate 7, a reinforcing web 23 and two side plates 8, the bottom plate 7 is arranged at the bottom of the two side plates 8 and is respectively connected to the two side plates 8, the two side plates 8 are respectively fixed to the adjacent side walls of the adjacent longitudinal ribs 2, and the two sides of the reinforcing web 23 are respectively welded to 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.

[0109] In this embodiment, the fourth special-shaped steel plates 26 are arranged at equal intervals along the longitudinal bridge, and the spacing between adjacent fourth special-shaped steel plates 26 is 0.5-1.5 m (selected according to actual needs, the above range is acceptable).

[0110] like Figure 23-24 As shown, in this embodiment, the transverse width of the fourth straight steel plate 27 is greater than the transverse width of the longitudinal rib 2 fixed thereto, and both ends of the fourth straight steel plate 27 in the transverse direction exceed the transverse ends of the longitudinal rib 2 fixed thereto, and the connection between the fourth straight steel plate 27 and the third fixed connector is arranged at the transverse ends of the fourth straight steel plate 27. When the fourth straight steel plate 27 is adopted, the bottom of the longitudinal rib 2 fixed to the fourth straight steel plate 27 is not provided with a rib bottom steel plate 17, which is equivalent to directly widening the rib bottom steel plate 17 (it can also be thickened according to the requirements of the force performance), that is, obtaining the fourth straight steel plate 27. When the fourth straight steel plate 27 is adopted, one of the steel plates of the fourth straight steel plate and the transverse seam connection structure needs to be disconnected to facilitate installation.

[0111] like Figure 18-19 As shown in 23-24, in this embodiment, bolt holes are opened on the web flange plate 25 or the longitudinal beam upper flange plate, the third fixed connecting member includes a web / longitudinal beam connecting bolt 28, and the third embedded connecting steel component and the web flange plate 25 or the third embedded connecting steel component and the longitudinal beam upper flange plate are connected into a whole through the web / longitudinal beam connecting bolt 28.

Claims

1. A joint connection structure of a UHPC low-rib bridge deck, characterized in that: The UHPC low-rib bridge deck comprises a UHPC panel (1) and a longitudinal rib (2) fixedly arranged at the bottom of the UHPC panel (1), the UHPC panel (1) and the longitudinal rib (2) being integrally formed, the joint connection structure being arranged between adjacent UHPC low-rib bridge decks, the joint connection structure comprising a cast-in-place UHPC connection portion (3) arranged at adjacent UHPC panels (1) and a longitudinal rib connection portion arranged at adjacent longitudinal ribs (2), the longitudinal rib connection portion comprising a first embedded connection steel component and a first fixed connection piece for connecting adjacent first embedded connection steel components, the first embedded connection steel component being arranged on the longitudinal rib (2); The first embedded connecting steel component is a first special-shaped steel plate (5) or a first straight steel plate (6) arranged in the transverse direction of the bridge; the first special-shaped steel plate (5) is embedded between adjacent longitudinal ribs (2) at the longitudinal end 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 bottom of the two side plates (8) and is respectively connected to the two side plates (8); the two side plates (8) are respectively fixed to adjacent side walls of adjacent longitudinal ribs (2); the first straight steel plate (6) is embedded at the bottom of the longitudinal ribs (2) at the longitudinal end of the UHPC low-rib bridge deck.

2. The joint connection structure according to claim 1, characterized in that: The joint connection structure is a transverse bridge joint connection structure; the center distance k between the transverse bridge joint connection structure and the closest transverse partition (4) or crossbeam is 0.2-0.5 times the center distance between adjacent transverse partitions (4) or the center distance between adjacent transverse partitions (4) and crossbeams.

3. The joint connection structure according to claim 2, characterized in that: The first fixed connection member comprises a longitudinal connection steel plate (9) and a longitudinal connection bolt (10), the longitudinal connection steel plate (9) being provided with a bolt hole matching the longitudinal connection bolt (10), and the adjacent first embedded connection steel components between the adjacent longitudinal ribs (2) in the longitudinal bridge direction are connected into a whole through the longitudinal connection steel plate (9) and the longitudinal connection bolt (10).

4. The joint connection structure according to any one of claims 1 to 3, characterized in that: The thickness of the UHPC panel (1) is 0.06-0.14 m. A notch (19) is provided at a longitudinal end of the UHPC panel (1). The height of the notch (19) is 30-70% of the thickness of the UHPC panel (1). The longitudinal length of the notch (19) is 0.3-0.6 m. The longitudinal ribs (2) are inverted trapezoidal. The rib height of the longitudinal ribs (2) is 0.08-0.3 m. The spacing between adjacent longitudinal ribs (2) is 0.4 -1.0m, the top width of the longitudinal rib (2) is 0.2-0.5m, and the bottom width is 0.15-0.4m; a rib bottom steel plate (17) is provided at the bottom of the longitudinal rib (2), the rib bottom steel plate (17) is the same width as the bottom width of the longitudinal rib (2), the thickness of the rib bottom steel plate (17) is 0.006-0.014m, and a bolt (18) is provided on the top surface of the rib bottom steel plate (17) for connecting the rib bottom steel plate (17) and the longitudinal rib (2) into a whole.

5. A steel-UHPC composite bridge, characterized in that: It comprises a steel beam (11) and a plurality of split UHPC low-rib bridge decks arranged on the upper part of the steel beam (11), wherein adjacent UHPC low-rib bridge decks are connected into a whole in the longitudinal direction of the bridge by a joint connection structure of the UHPC low-rib bridge deck according to any one of claims 1 to 4.

6. The steel-UHPC composite bridge according to claim 5, characterized in that: The UHPC low-rib bridge deck is connected to the diaphragm upper flange plate (20) or the beam upper flange plate of the steel beam (11) via a transverse upper flange plate connector, the transverse upper flange plate connector comprising a second embedded connecting steel component and a second fixed connecting component for connecting the second embedded connecting steel component and the diaphragm upper flange plate (20) or for connecting the second embedded connecting steel component and the beam upper flange plate, the second embedded connecting steel component being arranged at the intersection of the UHPC low-rib bridge deck and the diaphragm upper flange plate (20) or at the intersection of the UHPC low-rib bridge deck and the beam upper flange plate.

7. The steel-UHPC composite bridge according to claim 6, characterized in that: The second embedded connecting steel component is a third special-shaped steel plate (21) or a third straight steel plate (22) arranged in the transverse direction of the bridge; the third special-shaped steel plate (21) is embedded between 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 bottom of the two side plates (8) and is respectively connected to the two side plates (8); the two side plates (8) are respectively fixed to adjacent side walls of adjacent longitudinal ribs (2); the two sides of the reinforcing web plate (23) are respectively fixed to the two side plates (8) and are vertically arranged in the middle of the bottom plate (7); the third straight steel plate (22) is embedded at the bottom of the longitudinal ribs (2) of the UHPC low-rib bridge deck.

8. The steel-UHPC composite bridge according to claim 7, characterized in that: The plane where the reinforcing web (23) of the third special-shaped steel plate (21) is located and the plane where the web of the diaphragm (4) or the web of the crossbeam is located are the same plane.

9. The steel-UHPC composite bridge according to any one of claims 6 to 8, characterized in that: The diaphragm upper flange plate (20) or the beam upper flange plate is provided with bolt holes, the second fixed connection member comprises a diaphragm connection bolt (24), and the second embedded connection steel component and the diaphragm upper flange plate (20) or the second embedded connection steel component and the beam upper flange plate are connected into a whole via the diaphragm connection bolt (24).

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