Pier beam joint fixing structure of beam-arch combined system bridge

Abstract

The utility model relates to a pier-beam fixed joint structure of a beam-arch combined system bridge, in particular to a pier-beam fixed joint structure of a steel-concrete combined arch rib and a steel box beam in the beam-arch combined system bridge, which comprises the steel box beam and the steel-concrete combined arch rib. Through holes are formed in the positions, corresponding to the reinforced concrete combined arch ribs, of the middle of the steel box girder, and the reinforced concrete combined arch ribs penetrate through the steel box girder and then extend upwards. A steel corbel supporting main beam used for supporting is arranged on the lower side of the joint position of the steel box beam and the reinforced concrete combined arch rib, and the top of the steel corbel supporting main beam is fixedly connected with the bottom of the steel box beam. The two webs on the inner sides of the steel box girder and the steel corbel supporting main girder are anchored with the reinforced concrete combined arch rib, and prestressed steel bars are arranged to fix the two webs on the inner sides of the steel box girder and the steel corbel supporting main girder with the reinforced concrete combined arch rib into a whole. The connecting structure is simple in structure and good in force transmission effect, and the stability, the bearing performance and the safety of the structure are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of arch bridge construction, in particular to a pier-beam fixing structure of a beam-arch combined system bridge. Background Art

[0002] Baimahu Bridge is a key node project on Baimahu Avenue. The project is generally north-south oriented, with a total length of 24km. It is built to the standards of a secondary highway with a design speed of 60km / h. Baimahu Bridge and Baimahu Avenue will connect multiple scenic spots in Baimahu, forming a "20-minute tourism traffic circle" in the Baimahu scenic area, and accelerating the goal of integrating Baimahu scenic area into the 2-hour economic circle of the Yangtze River Delta. Baimahu Bridge is adjacent to the entrance of Baimahu Scenic Area. The bridge is located on an open water surface. Considering the geographical location, it must be built as a landmark building in the lake area.

[0003] In order to create the iconic Baima Lake Bridge, the three elements of Baima Lake culture were extracted by understanding the culture of Baima Lake: water, horses and fish. Furthermore, the two elements of water and fish were combined with the folk legend "Fish Leaping Over the Dragon Gate", and the front and back tilts were abstracted to design a bridge like Figure 1 The two arch towers, one large and one small, are like two white fish leaping out of the lake. The bridge has the dynamic beauty of fish leaping out of the water, which is beautiful and unique.

[0004] In order to obtain the designed bridge type, several parts need to pass the arch tower structure through the middle of the bridge to obtain the shape of the large arch tower structure and the small arch tower structure. There are two conventional and commonly used pier-beam consolidation methods. One is to open a hole in the bottom plate of the steel box girder at the top of the pier, and the main reinforcement and stirrups of the pier are extended into the cross beam of the steel box girder, and concrete is poured in the cross beam of the steel box girder to form pier-beam consolidation; the other is to set a steel casing on the top of the cylindrical pier, weld the steel casing to the bottom plate of the box girder, add stiffening ribs to weld the steel casing and the bottom plate of the box girder, and the stiffening ribs are used to consolidate the pier column and the steel box girder. However, both methods require the arch tower structure to be interrupted, which is not suitable for the large arch tower structure and small arch tower structure in this design. Utility Model Content

[0005] In view of the above-mentioned technical problems, the present technical scheme provides a pier-beam fixing structure of a beam-arch composite system bridge, in which a through hole is arranged in the middle of the steel box girder, and the reinforced concrete composite arch rib is extended upward after passing through the through hole of the steel box girder, thereby realizing the large arch tower structure and the small arch tower structure required in the design; and by supporting the main beam with steel corbels, the support range of the consolidation point of the steel box girder and the reinforced concrete composite arch rib is increased, and the cantilever length of the steel box girder is reduced; and the above-mentioned problems can be effectively solved.

[0006] The utility model is realized by the following technical solutions:

[0007] A pier-beam fixing structure of a beam-arch composite bridge comprises a steel box beam and a reinforced concrete composite arch rib; a through hole is arranged in the middle of the steel box beam at a position corresponding to the reinforced concrete composite arch rib, and the reinforced concrete composite arch rib extends upward after penetrating the steel box beam; a steel corbel supporting main beam for support is arranged on the lower side of the connecting position of the steel box beam and the reinforced concrete composite arch rib, and the top of the steel corbel supporting main beam is fixedly connected to the bottom of the steel box beam; the web plates on the inner sides of the steel box beam and the steel corbel supporting main beam are anchored to the reinforced concrete composite arch rib, and prestressed steel bars are arranged to fix the two opposite web plates on the inner sides of the steel box beam and the steel corbel supporting main beam to the reinforced concrete composite arch rib as a whole.

[0008] Furthermore, the top of the steel corbel supporting the main beam and the bottom of the steel box beam are fixedly connected by high-strength bolts.

[0009] Furthermore, the high-strength bolts are M24 high-strength bolts, and the M24 high-strength bolts are friction-type high-strength bolts with a performance grade of 10.9, and the technical indicators should meet the requirements of GB / T 1228-2006.

[0010] Furthermore, the webs on the inner sides of the steel box girder and the steel corbel supporting main beam and the steel plates at the connection positions with the reinforced concrete composite arch ribs are all provided with shear nails, and the shear nails are wrapped in concrete to strengthen the connection between the concrete and the steel box girder and the steel corbel supporting main beam.

[0011] Furthermore, the steel box girder and steel corbel supporting main beam are located at the position connected with the reinforced concrete composite arch rib, and extension parts extending into the steel box girder and steel corbel supporting main beam are arranged around the reinforced concrete composite arch rib, and the extension parts are filled with slightly expanding concrete; shear nails are arranged on the outer wall of the reinforced concrete composite arch rib, as well as the contact surface between the steel box girder and steel corbel supporting main beam and the extension parts.

[0012] Furthermore, the diameter of the shear stud is greater than or equal to 20 mm, and the length after welding is greater than or equal to 180 mm.

[0013] Furthermore, the prestressed steel bars include horizontal prestressed steel bars and vertical prestressed steel bars; the horizontal prestressed steel bars include transverse prestressed steel bars and longitudinal prestressed steel bars that are alternately arranged.

[0014] Furthermore, the vertical prestressing force is steel strands, and the horizontal prestressing force is precision-rolled threaded steel bars.

[0015] Furthermore, the steel corbel supporting main beam adopts a steel box structure, including a connecting portion connected with the reinforced concrete composite arch rib, the connecting portion extends to the middle of the steel box beam to form a supporting portion, and the bottom surface of the supporting portion gradually tilts upward from the inside to the outside.

[0016] Furthermore, a plurality of webs for support are arranged at intervals inside the steel box structure, and a manhole is arranged in the middle of the web; and stiffening ribs are arranged on the top plate, bottom plate and web of the steel box structure. Beneficial Effects

[0017] The pier-beam joint fixing structure of a beam-arch combined system bridge proposed in the utility model has the following beneficial effects compared with the prior art:

[0018] The utility model sets a through hole in the middle of the steel box girder, and extends the reinforced concrete composite arch rib upward after passing through the through hole of the steel box girder, so as to realize the large arch tower structure and the small arch tower structure required in the design; and by supporting the main beam with steel corbels, the support range of the consolidation point of the steel box girder and the reinforced concrete composite arch rib is increased, and the cantilever length of the steel box girder is reduced; and the steel box girder and the main beam supported by the steel corbels are connected and fixed with M24 high-strength bolts, and the stiffness matching between the two is good, and the overall force result is relatively ideal. At the same time, the steel box girder and the main beam supported by the steel corbels are anchored with the reinforced concrete composite arch ribs by shear nails, and an extension part and three-way prestressed steel bars are also set to fix the steel box girder and the main beam supported by the steel corbels with the reinforced concrete composite arch ribs, so as to ensure the reliable connection of the joint surface. The overall structure is simple, the force transmission effect is good, and the stability, bearing capacity and safety of the structure are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the design drawing of Baimahu Bridge in the background technology.

[0020] Figure 2 It is a side view of the overall structure of the utility model.

[0021] Figure 3 for Figure 2 An enlarged view of the central solid structure.

[0022] Figure 4 It is a side view of the steel box girder in the utility model.

[0023] Figure 5 It is a bottom plan view of the steel box girder in the utility model.

[0024] Figure 6 It is a top plan view of the main beam supported by the steel corbel in the utility model.

[0025] Figure 7 This is a connection diagram of the steel box girder and the reinforced concrete composite arch rib in the utility model.

[0026] Figure 8 This is the connection diagram of the steel corbel supporting the main beam in the utility model.

[0027] Fig. 9It is a side view of the main beam supported by the steel corbel in the utility model.

[0028] Fig.10 for Fig. 9 Schematic diagram of medium DD.

[0029] The numbers in the attached drawings are: 1-steel box girder, 2-reinforced concrete composite arch rib, 3-steel corbel supporting main beam, 4-web, 5-reinforcement hole, 6-M24 high-strength bolt, 7-shear nail, 8-extension part, 9-micro-expansive concrete, 10-horizontal prestressed steel bar, 11-vertical prestressed steel bar, 12-manhole, 13-stiffening rib. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Under the premise of not departing from the design concept of the utility model, various modifications and improvements made by ordinary people in this field to the technical solutions of the utility model should fall within the protection scope of the utility model. Example

[0031] like Figures 2 to 4 As shown, a pier-beam fixing structure of a beam-arch combination system bridge comprises a steel box girder 1 and a reinforced concrete composite arch rib 2; a through hole is provided in the middle of the steel box girder 1 at a corresponding position of the reinforced concrete composite arch rib 2, and the reinforced concrete composite arch rib 2 extends upward after penetrating the steel box girder 1; a steel corbel supporting main beam 3 for support is provided on the lower side of the connecting position of the steel box girder 1 and the reinforced concrete composite arch rib 2, and the top of the steel corbel supporting main beam 3 is fixedly connected to the bottom of the steel box girder 1; the webs 4 on the inner sides of the steel box girder 1 and the steel corbel supporting main beam 3 are anchored to the reinforced concrete composite arch rib 2, and prestressed steel bars are provided to fix the two opposite webs on the inner sides of the steel box girder 1 and the steel corbel supporting main beam 3 to the reinforced concrete composite arch rib 2 as a whole.

[0032] like Figure 5 and Figure 6 As shown, a plurality of reinforcement holes 5 penetrating the steel plate are provided on the top plate of the steel corbel supporting the top of the main beam 3 and the bottom plate of the steel box beam, and the reinforcement holes 5 of the two are fixedly connected by high-strength bolts 6, so that the steel corbel supporting the main beam 3 and the steel box beam 1 are fixed. The high-strength bolts are M24 high-strength bolts 6, and the M24 high-strength bolts 6 are friction-type high-strength bolts with a performance grade of 10.9, and the technical indicators should meet the requirements of GB / T 1228-2006.

[0033] like Figure 2 , Figure 3 , Figures 7 to 9As shown, the web 4 on the inner side of the steel box girder 1 and the steel corbel supporting main beam 3 and the steel plate at the connection position with the reinforced concrete composite arch rib 2 are all provided with shear nails 7; and the steel box girder 1 and the steel corbel supporting main beam 3 are located at the connection position with the reinforced concrete composite arch rib 2, and extensions 8 extending toward the inside of the steel box girder 1 and the steel corbel supporting main beam 3 are provided around the reinforced concrete composite arch rib 2, and the extensions 8 are filled with micro-expansive concrete 9; shear nails 7 are provided on the outer wall of the reinforced concrete composite arch rib 2 and the contact surface between the steel box girder 1 and the steel corbel supporting main beam 3 and the extension 8.

[0034] The shear nail 7 is wrapped in concrete to strengthen the connection between the concrete and the steel box girder 1 and the steel corbel supporting main girder 3. The diameter of the shear nail 7 is greater than or equal to 20 mm, and the length after welding is greater than or equal to 180 mm. In this embodiment, the diameter of the shear nail is 25 mm, and the length after welding is 200 mm.

[0035] like Figure 3 , Figure 5 , Figure 7 As shown, the prestressed steel bars include horizontal prestressed steel bars 10 and vertical prestressed steel bars 11; the horizontal prestressed steel bars 10 include transverse prestressed steel bars and longitudinal prestressed steel bars arranged alternately. The horizontal prestressed steel bars 10 are made of finely rolled threaded steel bars, and the vertical prestressed steel bars 11 are made of steel strands.

[0036] like Figure 6 , Figures 8 to 10 As shown, the steel corbel supporting main beam 3 adopts a steel box structure, including a connection portion connected with the reinforced concrete composite arch rib 2, the connection portion extends to the middle of the steel box beam to form a support portion, and the bottom surface of the support portion gradually tilts upward from the inside to the outside. The internal intervals of the steel box structure are provided with a plurality of vertically arranged webs 4 for support, and a manhole 12 is provided in the middle of the web 4; stiffening ribs 13 are provided on the top plate, bottom plate, and web of the steel box structure.

[0037] The above implementation is only for illustrating the technical concept and features of the utility model, and its purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent transformation or modification made according to the spirit of the utility model should be included in the utility model.

Claims

1. A pier-beam joint structure of a beam-arch composite bridge, comprising a steel box beam (1) and a reinforced concrete composite arch rib (2); characterized in that: A through hole is provided in the middle of the steel box girder (1) at a position corresponding to the reinforced concrete composite arch rib (2), and the reinforced concrete composite arch rib (2) extends upward after penetrating the steel box girder (1); a steel corbel support main beam (3) for support is provided at the lower side of the connection position between the steel box girder (1) and the reinforced concrete composite arch rib (2), and the top of the steel corbel support main beam (3) is fixedly connected to the bottom of the steel box girder (1); the webs (4) on the inner sides of the steel box girder (1) and the steel corbel support main beam (3) are anchored to the reinforced concrete composite arch rib (2), and prestressed steel bars are provided to fix the two opposite webs (4) on the inner sides of the steel box girder (1) and the steel corbel support main beam (3) to the reinforced concrete composite arch rib (2) as a whole.

2. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 1, characterized in that: The top of the steel corbel supporting main beam (3) and the bottom of the steel box beam (1) are fixedly connected by high-strength bolts (6).

3. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 2, characterized in that: The high-strength bolts (6) are M24 high-strength bolts, which are friction-type high-strength bolts with a performance grade of 10.9 and technical indicators that meet the requirements of GB / T 1228-2006.

4. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 1, characterized in that: The webs (4) on the inner sides of the steel box girder (1) and the steel corbel supporting main beam (3) and the steel plates at the connection positions with the reinforced concrete composite arch ribs (2) are all provided with shear nails (7); the shear nails (7) are wrapped in concrete to strengthen the connection between the concrete and the steel box girder (1) and the steel corbel supporting main beam (3).

5. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 1, characterized in that: The steel box girder (1) and the steel corbel supporting main beam (3) are located at a position where they are connected to the reinforced concrete composite arch rib (2); an extension portion (8) extending into the steel box girder (1) and the steel corbel supporting main beam (3) is arranged around the reinforced concrete composite arch rib (2); the extension portion (8) is filled with micro-expansion concrete (9); and shear nails (7) are arranged on the outer wall of the reinforced concrete composite arch rib (2) and the contact surface between the steel box girder (1) and the steel corbel supporting main beam (3) and the extension portion (8).

6. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 4 or 5, characterized in that: The shear nail (7) has a diameter greater than or equal to 20 mm and a length after welding greater than or equal to 180 mm.

7. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 1, characterized in that: The prestressed steel bars include horizontal prestressed steel bars (10) and vertical prestressed steel bars (11); the horizontal prestressed steel bars (10) include transverse prestressed steel bars and longitudinal prestressed steel bars that are alternately arranged.

8. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 7, characterized in that: The vertical prestressed steel bars (11) are made of steel strands, and the horizontal prestressed steel bars (10) are made of precision-rolled threaded steel bars.

9. A pier-beam joint fixing structure of a beam-arch combined system bridge according to any one of claims 1-5, 7-8, characterized in that: The steel corbel supporting main beam (3) adopts a steel box structure, including a connection portion connected to the reinforced concrete composite arch rib (2), the connection portion extending to the middle of the steel box beam (1) to form a support portion, the bottom surface of the support portion gradually tilts upward from the inside to the outside.

10. The pier-beam joint fixing structure of a beam-arch combined system bridge according to claim 9, characterized in that: A plurality of webs (4) for support are arranged at intervals inside the steel box structure, and a manhole (12) is arranged in the middle of the webs; and stiffening ribs (13) are arranged on the top plate, bottom plate and webs of the steel box structure.

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