Fabricated concrete rigid frame bridge

Abstract

The utility model discloses a fabricated concrete rigid frame bridge, and relates to the technical field of bridge engineering. The fabricated concrete rigid frame bridge comprises a reinforced concrete pier and a steel beam, the end of the steel beam is connected to the top of the reinforced concrete pier, a laminated slab bridge deck is laid on the top of the steel beam, and the end of the steel beam is fixed or hinged to the top of the reinforced concrete pier; the ends of the steel beams are fixed to the tops of the reinforced concrete piers in a concrete pouring mode, and the parts, poured to the tops of the reinforced concrete piers, of the steel beams are provided with component force structures which are used for dispersing part of pressure of the steel beams into the surrounding reinforced concrete piers. The structural form is particularly suitable for a bridge structure with the span of 20-50 m, the advantages of a combined structure can be brought into play to the maximum extent, the construction period is shortened, the later maintenance cost is low, and good anti-seismic performance and structural rigidity are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to an assembled concrete rigid frame bridge. Background Art

[0002] A rigid frame bridge is a bridge whose main load-bearing structure is a rigid frame, that is, the beam and legs or piers form a rigid connection. The main load-bearing structure of a rigid frame bridge is a rigid frame structure in which the beam and piers are consolidated. Due to the consolidation of the piers and beams, the beams and piers are subjected to force as a whole. The piers not only bear the vertical pressure caused by the load on the beams, but also the bending moment and horizontal thrust. Under the action of vertical loads, the bending moment of the beams of a rigid frame bridge is usually smaller than that of a continuous beam or simply supported beam of the same span, and its spanning capacity is greater than that of a beam bridge. The consolidation of piers and beams eliminates large supports, and the structure has strong integrity and good seismic performance. Therefore, prestressed concrete rigid frame bridges are currently the main type of long-span bridges.

[0003] Existing rigid frame bridges are constructed by casting the piers, then building a steel beam structure on top, which is then connected together by casting. The steel beams are connected by bolts or welding. The overall construction progress is slow and time-consuming. In addition, the stress between the steel beams and the piers is completely concentrated on the contact surface. The steel beams and piers need to be of sufficient size and rigidity to meet the bearing capacity requirements. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an assembled concrete rigid frame bridge, which solves the deficiencies of the existing rigid frame bridges.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an assembled concrete rigid frame bridge, comprising reinforced concrete piers and steel beams, wherein the ends of the steel beams are connected to the tops of the reinforced concrete piers, and a composite slab bridge deck is laid on the tops of the steel beams, and the ends of the steel beams are fixed or hinged to the tops of the reinforced concrete piers;

[0006] The end of the steel beam is fixed to the top of the reinforced concrete pier by pouring concrete, and the part of the steel beam poured on the top of the reinforced concrete pier is provided with a force distribution structure, which is used to disperse part of the pressure of the steel beam to the surrounding reinforced concrete piers.

[0007] Preferably, the cross-section of the steel beam is an I-shaped structure, and the force distribution structure includes end pressure-bearing plates fixedly connected to both sides of the end of the steel beam, the side surfaces of the end pressure-bearing plates are provided with vertical pressure distribution structures, and an inclined force distribution structure is provided between the bottom of the end pressure-bearing plates and the bottom of the steel beam.

[0008] Preferably, the facade pressure-dividing structure is a horizontal plate fixedly connected between the side surface of the middle vertical plate of the steel beam and the end pressure-bearing plate, and the horizontal plate is provided with at least two layers.

[0009] Preferably, the inclined force distribution structure is a triangular support plate fixedly connected to the side of the end pressure plate and the bottom of the steel beam end, and multiple triangular support plates are arranged in parallel, and the inclined surfaces of the multiple triangular support plates are connected as a whole through the inclined plate, thereby connecting the bottom of the end pressure plates on both sides into one.

[0010] Preferably, the inner surface of the end of the steel beam is evenly provided with anchor nails for integrally pouring into the concrete.

[0011] Preferably, the reinforced concrete bridge pier includes a cap beam, a bridge pier and a pedestal from top to bottom, and the steel beam includes a plurality of steel main beams arranged in parallel along the width direction, and a plurality of steel secondary beams are equidistantly connected between two adjacent steel main beams, and both ends of the steel main beam are installed on the top of the cap beam.

[0012] Preferably, when the steel beam is fixedly installed on the top of the reinforced concrete pier, the cap beam and the pier are arranged in two sections to connect two steel beams respectively.

[0013] Preferably, when the steel beam is hinged to the top of the reinforced concrete pier, a hinge seat is provided on the top of the cap beam to connect the steel beam.

[0014] The utility model provides a prefabricated concrete rigid frame bridge. Compared with the existing technology, it has the following advantages:

[0015] Beneficial effects:

[0016] (1) The rigid frame bridge type is adopted, and the beam and pier are rigidly connected, with high overall rigidity and good structural continuity, which can effectively disperse and transmit loads; the bridge body as a whole is an over-static structure, which can resist the horizontal and vertical loads input by earthquake action and has excellent seismic performance; there are no supports at the piers, which reduces the possible wear and corrosion during the operation of the bridge and reduces the maintenance cost;

[0017] (2) The cap beam and the embedded steel main beam sections are prefabricated in the factory, which reduces the amount of wet work on site and speeds up construction. The cap beam concrete and the embedded I-beam work together to form a steel-concrete composite, which strengthens the stiffness and integrity of the joints and meets the design requirements of "strong joints and weak components." The concrete wraps around the embedded steel main beams, reducing the corrosion rate of the steel when exposed to the atmospheric environment and extending the service life of the bridge.

[0018] (3) The steel main beam adopts I-beam main beam, which is easy to construct; the cross-section material utilization rate is high, which reduces the amount of steel used in the bridge and is suitable for small and medium span bridges; the beam cross-section is open, which is convenient for daily maintenance and inspection;

[0019] (4) The bridge deck is constructed in the form of a composite slab, which enables formwork-free construction. The prefabricated slabs are laid quickly and conveniently, shortening the construction period to the greatest extent and avoiding the impact of construction on traffic below.

[0020] (5) Setting up a force distribution structure at the connection section between the steel beam and the reinforced concrete pier can expand the range of the test force of the steel beam on the reinforced concrete pier. By dispersing the stress, the reinforced concrete pier can withstand greater pressure and the end of the steel beam is not easily deformed.

[0021] In summary, this structural form is particularly suitable for bridge structures with a span of 20-50m. It can maximize the advantages of the composite structure, shorten the construction period, reduce the subsequent maintenance cost, and have good seismic performance and structural stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the main view of the main structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the end-to-end consolidation method of the present invention;

[0024] Figure 3 Schematic diagram of the hinged connection method of the utility model;

[0025] Figure 4 It is a top view of the main structure of the utility model;

[0026] Figure 5 It is a three-dimensional schematic diagram of the force distribution structure of the utility model.

[0027] In the figure: 1-reinforced concrete bridge pier, 11-cap beam, 12-bridge pier, 13-capping platform;

[0028] 2-steel beam, 21-steel main beam, 22-steel secondary beam;

[0029] 3- Composite slab deck;

[0030] 4-force distribution structure, 41-end pressure plate, 42-transverse plate, 43-triangular support plate, 44-slant plate;

[0031] 5-anchor;

[0032] 6- Articulated seat. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] The utility model provides the following two technical solutions:

[0035] Figures 1-4 The first embodiment is shown: an assembled concrete rigid frame bridge, comprising a reinforced concrete pier 1 and a steel beam 2. The ends of the steel beam 2 are connected to the top of the reinforced concrete pier 1, and a composite slab bridge deck 3 is laid on the top of the steel beam 2. The composite slab bridge deck 3 adopts a reinforced concrete composite slab structure, which is composed of precast slabs and cast-in-place layers to form a jointly stressed whole. The precast slabs are generally laid between the steel main beams 21. The ends of the steel beam 2 are connected to the top of the reinforced concrete pier 1 by either consolidation or hinged connection according to actual engineering requirements.

[0036] When the end of the steel beam 2 is fixed to the top of the reinforced concrete pier 1, it is fixed by pouring concrete, and the part of the steel beam 2 cast on the top of the reinforced concrete pier 1 is provided with a force distribution structure 4, which is used to disperse part of the pressure of the steel beam 2 to the surrounding reinforced concrete piers 1.

[0037] The reinforced concrete bridge pier 1 includes a cap beam 11, a bridge pier 12 and a foundation 13 from top to bottom. The bridge pier 12 is cast under the cap beam 11, and the two can be connected by internal flange connection, external flange connection, tenon connection, steel plate welding connection, grouting sleeve connection, etc.; the steel beam 2 includes multiple steel main beams 21 arranged in parallel along the width direction, using I-beams with a height-span ratio of between 1 / 18 and 1 / 30, and a span of between 20-50m. A number of steel secondary beams 22 are equidistantly connected between two adjacent steel main beams 21. The two ends of the steel main beam 21 are installed on the top of the cap beam 11, and bolt connectors are arranged on the upper edge of the steel secondary beam 22, which is combined with the concrete composite slab bridge deck 3.

[0038] When the steel beam 2 is fixedly installed on the top of the reinforced concrete pier 1, the cap beam 11 and the pier 12 are arranged in two sections to connect the two steel beams 2 respectively; when the joint ends are consolidated, the steel beam 2 is embedded in the cap beam 11 through the embedded section, and the rotational freedom is restricted. The bending moment at the beam end is transmitted to the pier 12 and the foundation of the abutment 13 through the cap beam 11;

[0039] When the steel beam 2 is hinged to the top of the reinforced concrete pier 1, a hinge seat 6 is set at the top of the cap beam 11 to connect the steel beam 2; when the joint end is hinged, the steel beam 2 is connected to the cap beam 11 through the hinge seat 6, and no bending moment is generated at the beam end, and only shear force is generated on the lower structure such as the cap beam 11.

[0040] Figure 5 A second embodiment is shown, which differs from the first embodiment mainly in that: the cross section of the steel beam 2 is an I-shaped structure, the force distribution structure 4 includes an end pressure plate 41 fixedly connected to both sides of the end of the steel beam 2, the side of the end pressure plate 41 is provided with a vertical pressure distribution structure, and an inclined force distribution structure is provided between the bottom of the end pressure plate 41 and the bottom of the steel beam 2;

[0041] The vertical pressure-dividing structure is a horizontal plate 42 fixedly connected between the side of the middle vertical plate of the steel beam 2 and the end pressure-bearing plate 41, and the horizontal plate 42 is provided with at least two layers;

[0042] The inclined force distribution structure is a triangular support plate 43 fixedly connected to the side of the end pressure plate 41 and the bottom of the end of the steel beam 2, and there are multiple triangular support plates 43 arranged in parallel. The inclined surfaces of the multiple triangular support plates 43 are connected as a whole through the inclined plate 44, thereby connecting the bottom of the end pressure plates 41 on both sides into one.

[0043] The inner surface of the end of the steel beam 2 is evenly provided with anchor nails 5 for integral casting into the concrete; in the positive bending moment area at the mid-span, ordinary bolt connectors are arranged on the upper edge of the steel main beam 21; in the negative bending moment area of ​​the support, the upper edge of the cross section of the steel main beam 21 is arranged according to the force analysis results. If there is a situation where the top plate is under tension, a pull-out but not shear connector is arranged; if there is no situation where the top plate is under tension, an ordinary bolt connector is arranged.

[0044] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0045] The construction process of the bridge is as follows:

[0046] S1, construction of pile foundation and pier 12, during the construction of pier 12, a connection between pier 12 and prefabricated cap beam 11 is reserved;

[0047] S2. Install the prefabricated cap beam 11. Connect the cap beam 11 to the pier 12 using an inner flange.

[0048] S3. Set up temporary supports and install the steel main beam 21. Connect the two ends of the steel main beam 21 to the extended part of the pre-embedded steel main beam 21 of the cap beam 11 with high-strength bolts or weld them on site.

[0049] S4, 21 segments of steel main beams are connected by high-strength bolts or welded on site on temporary supports;

[0050] S5. The corbels extending outward from the webs of the steel secondary beam 22 and the steel main beam 21 are connected by high-strength bolts or welded on site;

[0051] S6. Lay precast concrete slabs between the primary and secondary beam systems;

[0052] S7. Tie the cast-in-place layer steel bars on the surface of the precast slab, and then pour the cast-in-place layer concrete;

[0053] S8. After the concrete reaches the required strength, remove the temporary support.

[0054] S9. Install the bridge deck auxiliary structure.

[0055] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An assembled concrete rigid frame bridge, comprising reinforced concrete piers and steel beams, characterized in that: The end of the steel beam is connected to the top of the reinforced concrete pier, and a composite slab bridge deck is laid on the top of the steel beam. The end of the steel beam is fixed or hinged to the top of the reinforced concrete pier; The end of the steel beam is fixed to the top of the reinforced concrete pier by pouring concrete, and the part of the steel beam poured on the top of the reinforced concrete pier is provided with a force distribution structure, which is used to disperse part of the pressure of the steel beam to the surrounding reinforced concrete piers.

2. The assembled concrete rigid frame bridge according to claim 1, characterized in that: The cross-section of the steel beam is an I-shaped structure, and the force distribution structure includes end pressure-bearing plates fixedly connected to both sides of the steel beam end. The side surfaces of the end pressure-bearing plates are provided with vertical pressure distribution structures, and an inclined force distribution structure is provided between the bottom of the end pressure-bearing plates and the bottom of the steel beam.

3. The assembled concrete rigid frame bridge according to claim 2, characterized in that: The facade pressure-dividing structure is a horizontal plate fixedly connected between the side surface of the middle vertical plate of the steel beam and the end pressure-bearing plate, and the horizontal plate is provided with at least two layers.

4. The assembled concrete rigid frame bridge according to claim 2, characterized in that: The inclined surface force distribution structure is a triangular support plate fixedly connected to the side surface of the end pressure plate and the bottom of the steel beam end, and multiple triangular support plates are arranged in parallel. The inclined surfaces of the multiple triangular support plates are connected as a whole through the inclined plate, thereby connecting the bottom of the end pressure plates on both sides into one.

5. The assembled concrete rigid frame bridge according to claim 1, characterized in that: Anchor nails are evenly arranged on the inner surface of the end of the steel beam for integrally pouring into the concrete.

6. The assembled concrete rigid frame bridge according to claim 1, characterized in that: The reinforced concrete bridge pier includes a cap beam, a bridge pier and a pedestal from top to bottom. The steel beam includes a plurality of steel main beams arranged in parallel along the width direction, and a plurality of steel secondary beams are equidistantly connected between two adjacent steel main beams. Both ends of the steel main beam are installed on the top of the cap beam.

7. The assembled concrete rigid frame bridge according to claim 6, characterized in that: When the steel beam is fixedly installed on the top of the reinforced concrete pier, the cap beam and the pier are divided into two sections and respectively connected to the two steel beams.

8. The assembled concrete rigid frame bridge according to claim 6, characterized in that: When the steel beam is hinged to the top of the reinforced concrete pier, a hinge seat is provided on the top of the cap beam to connect the steel beam.

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