Temporary fixing device for construction of steel-concrete combined section of beam bridge and construction method

Abstract

The invention discloses a temporary fixing device for beam bridge steel-concrete combined section construction and a construction method, and relates to the technical field of mixed beam bridge construction. The steel truss is formed by welding channel steel and gusset plates, one side of the steel truss is pre-buried in the concrete beam, and the other side of the steel truss is fixedly connected with a web of the steel beam; the steel truss part pre-embedded in the concrete beam is provided with a round hole for a steel bar to pass through; the cantilever beam structure comprises a steel cantilever beam frame, the rear end of the steel cantilever beam frame is connected with the concrete beam through an anchoring device, the middle of the steel cantilever beam frame is rotationally connected with a top plate of the concrete beam through a first hinged support, a distribution beam is arranged at the front end of the steel cantilever beam frame, and the distribution beam is connected with the steel beam through a suspension assembly. According to the steel-concrete combined section, accurate positioning of the steel beam can be achieved, sufficient supporting strength and rigidity are achieved, local deformation of the steel beam can be prevented, and the beneficial effect that the steel-concrete combined section forms a complete and stable structure is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid beam bridge construction, and in particular to a temporary fixing device and a construction method for the construction of a steel-concrete combined section of a beam bridge. Background Art

[0002] A hybrid beam bridge refers to a beam bridge in which steel beams and reinforced concrete beams are connected by a joint in the longitudinal direction of the bridge to bear the joint load together. The steel-concrete joint section is an important component of the hybrid beam bridge, connecting the concrete beam section and the steel beam section. Usually, the steel beam of the hybrid joint section needs to be hoisted to the designed height using a hanging basket on the cantilever concrete beam, and then the wet joint concrete between the concrete beam and the steel beam is poured. After the wet joint concrete reaches the required strength, the mid-span steel beam section is hoisted to complete the main structure construction of the bridge. In this way, the internal force of the hybrid beam bridge can be smoothly transmitted between the steel beam and the concrete beam through the steel-concrete joint section. Before pouring the wet joint concrete between the concrete beam and the steel beam, a temporary connection between the steel beam and the concrete is required. This connection must ensure the stress safety of the temporary connection between the steel beam and the concrete, as well as the stress safety of the structure during the pouring of the wet joint concrete.

[0003] Currently, the construction of steel-concrete composite sections is typically carried out using a bridge crane or hanging basket. For example, the hanging basket is first fixed to the poured concrete beam, with the basket positioned within the vertical plane of the concrete beam web. The hanging basket's bracket is then lifted to the designed position, ensuring that the steel beam is directly below the designed position. The bracket is then lowered and connected to the steel beam's lifting lugs. Once ready, the steel beam is lifted to the designed height, and a temporary connection is made between the steel beam and the poured concrete beam section. Finally, the wet joint formwork is installed, and the wet joint concrete is poured. During on-site construction, the number of temporary connection components between the steel beam and concrete is typically large, and positioning between the steel beam and concrete beam is difficult. Therefore, the height of the steel beam needs to be adjusted using a lifting system before pouring the wet joint concrete. However, due to the heavy weight of the steel beam, conventional temporary supports have low stiffness, poor stability, and large structural deformation. The entire adjustment process is time-consuming and labor-intensive, seriously delaying the construction process. Summary of the Invention

[0004] The purpose of the present invention is to provide a temporary fixing device and construction method for the steel-concrete joint section of a beam bridge, so as to solve the problems mentioned in the background technology that due to the heavy weight of the steel beam, the conventional temporary support has low stiffness, poor stability, large structural deformation, and the entire adjustment process is time-consuming and labor-intensive, which seriously delays the construction progress.

[0005] The present invention adopts the following technical solutions:

[0006] The present invention provides a temporary fixing device for the construction of a steel-concrete combined section of a bridge, comprising a steel truss and a cantilever beam structure; one side of the steel truss is pre-embedded in a concrete beam, and the other side of the steel truss is fixedly connected to the web of the steel beam; the steel truss portion pre-embedded in the concrete beam is provided with a plurality of circular holes, and the steel bars in the concrete beam pass through the circular holes; the cantilever beam structure comprises a steel cantilever beam frame, which is arranged above the concrete beam and the steel beam along the direction of the concrete beam and the steel beam, the rear end of the steel cantilever beam frame is connected to the concrete beam through an anchoring device, the middle part of the steel cantilever beam frame is rotatably connected to the top plate of the concrete beam through a first hinge seat, and the front end of the steel cantilever beam frame is provided with a distribution beam, which is connected to the steel beam through a plurality of suspension components.

[0007] Preferably, the steel truss includes two plate-like frames; the plate-like frames include node plates, the node plates are fixedly connected by fixing rods, a plurality of circular holes are provided on the node plate located on one side of the concrete beam, and the node plate located on one side of the steel beam is fixedly connected to the steel beam.

[0008] Preferably, the anchoring device includes an anchoring block, which is arranged below the top plate of the concrete beam. The anchoring block is fixedly connected to the lower end of the connecting anchor rod, and the upper end of the connecting anchor rod passes through the top plate of the concrete beam and is fixedly connected to the steel cantilever beam frame.

[0009] Preferably, a pad is provided between the steel cantilever beam frame and the top plate of the concrete beam, a rubber pad is provided between the pad and the top plate of the concrete beam, and the connecting anchor rod passes through the pad.

[0010] Preferably, there are two anchor blocks, and the two anchor blocks are respectively arranged at the sloped thickened positions at both ends of the inner top wall of the concrete beam. The top surface of the anchor block is tightly fitted with the slope surface of the inner top wall of the concrete beam, and the two anchor blocks are fixedly connected by a pad beam.

[0011] Preferably, a rear anchor distribution beam is provided above the steel cantilever beam frame, and the upper end of the connecting anchor rod passes through the steel cantilever beam frame and is fixedly connected to the rear anchor distribution beam.

[0012] Preferably, the first hinge seat is rotatably connected to the embedded ear plate, and the embedded ear plate is embedded in the top plate of the concrete beam.

[0013] Preferably, the suspension assembly includes a second hinge seat, which is fixedly connected to the top surface of the steel beam and located directly above the web of the steel beam. A third hinge seat is provided on the bottom surface of the distribution beam, and the second hinge seat is connected to the third hinge seat by a steel wire rope.

[0014] The present invention also provides a construction method for temporarily fixing a steel-concrete joint section of a bridge, comprising:

[0015] Step 1: Assemble the steel truss. Install one side of the steel truss to the concrete wet joint when tying the reinforcement of the concrete beam. Pass the horizontal reinforcement of the web of the concrete beam through the circular hole, and firmly fix the steel truss to the formwork of the concrete beam.

[0016] Step 2: When tying the reinforcement bars of the concrete beam, the embedded ear plate is placed at the designed position of the concrete beam;

[0017] Step 3: pouring the concrete beam concrete and curing it;

[0018] Step 4: After the concrete beam reaches the design strength requirement, install the cantilever beam structure;

[0019] Step 5: Assemble the anchoring device;

[0020] Step 6: Fix the distribution beam above the front end of the steel cantilever beam frame, and install a third hinge seat and a steel wire rope on the lower end surface of the distribution beam;

[0021] Step 7: Install a second hinge seat on the top surface of the steel beam, use a bridge crane to lift the steel beam to the designed bridge position, connect the second hinge seat to the steel wire rope, and adjust the length of the steel wire rope to achieve preliminary positioning of the steel beam;

[0022] Step 8: Fine-tune the height of the steel beam by adjusting the length of the connecting anchor rod. After fine-tuning, tighten the connecting anchor rod.

[0023] Step 9: Weld and fix the node plate to the T-shaped rib of the steel beam web.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] (1) The temporary fixing device for the construction of the steel-concrete joint section of the bridge provided by the present invention passes the steel bars in the concrete beam through the circular holes of the steel truss and casts the steel truss in the concrete beam, thereby providing a stable support for the steel truss. The steel truss has sufficient strength and rigidity to support the entire weight of the steel beam and transmit the axial force and shear force between the steel beam and the concrete beam.

[0026] (2) The middle part of the steel cantilever beam frame in the present invention is rotatably connected to the concrete beam through the first hinge seat, and the front end of the steel cantilever beam frame is connected to the steel beam with the help of the distribution beam and the suspension assembly. With the first hinge seat as the fulcrum, the height position of the steel beam can be precisely fine-tuned by rotating the rear end of the steel cantilever beam frame using the lever effect.

[0027] (3) The distribution beam in the present invention is connected to the steel beam through a suspension assembly. The suspension assembly is located just above the web of the steel beam and is connected to the top plate of the box beam, which can prevent the steel beam from undergoing large local deformation during temporary fixation.

[0028] (4) The steel truss and steel cantilever beam structure are used in combination as a temporary fixing device, so that the steel-concrete joint section forms a complete and stable structure.

[0029] (5) The present invention has a small number of integral connecting components, making the assembly and adjustment process convenient, time-saving, and labor-saving. During the steel beam hoisting process, the steel beam can be accurately positioned, ensuring that the concrete beam and the steel beam are precisely aligned and have a consistent appearance. Furthermore, when pouring the wet concrete joints, the cantilever beam and the steel truss can share the load of the steel beam and the concrete, making the entire construction process safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 This is a front view of the temporary fixing device for the construction of the steel-concrete joint section of the bridge according to the present invention;

[0032] Figure 2 This is a structural diagram of a temporary fixing device for the construction of a steel-concrete joint section of a bridge according to the present invention;

[0033] Figure 3 This is a right view of the temporary fixing device for the construction of the steel-concrete joint section of the bridge according to the present invention;

[0034] Figure 4 This is a left view of the temporary fixing device for the construction of the steel-concrete joint section of a bridge according to the present invention;

[0035] Figure 5 This is a detailed view of the gusset plate in the temporary fixing device for the construction of the steel-concrete joint section of the bridge according to the present invention;

[0036] Explanation of the accompanying reference numerals: 1. Steel truss; 1-1. Plate frame; 1-2. Node plate; 1-3. Round hole; 1-4. Fixing rod; 1-4-1. Chord; 1-4-2. Web member; 2. Cantilever beam structure; 2-1. Steel cantilever beam frame; 2-2. Distribution beam; 3. Concrete beam; 4. Steel beam; 5. Anchoring device; 5-1. Pad beam; 5-2. Connecting anchor rod; 5-3. Pad block; 5-4. Rear anchor distribution beam; 5-5. Rubber pad; 5-6. Anchor block; 6. Suspension assembly; 6-1. Second hinge seat; 6-2. Steel wire rope; 6-3. Third hinge seat; 7. First hinge seat; 8. Embedded ear plate. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1 As shown, this embodiment discloses a temporary fixing device for the construction of a steel-concrete joint section of a bridge, including a steel truss 1 and a cantilever beam structure 2.

[0039] like Figure 2 and Figure 5 As shown, one side of the steel truss 1 is embedded in the concrete beam 3, and the other side of the steel truss 1 is fixedly connected to the web of the steel beam 4. The steel truss 1 includes two plate-like frames 1-1, which are respectively arranged on both sides of the steel beam 4. The plate-like frames 1-1 include node plates 1-2, which are fixedly connected together by fixing rods 1-4. A number of circular holes 1-3 are provided on the node plate 1-2 located on one side of the concrete beam 3. The node plate 1-2 and the fixing rods 1-4 on this side are embedded in the concrete beam 3, and when embedded, the steel bars in the concrete beam 3 pass through the circular holes 1-3 to play an anchoring role, and at the same time provide support when pouring wet joint concrete, so that the connection between the concrete and the node plate 1-2 after pouring is more stable. The node plate 1-2 located on one side of the steel beam 4 is fixedly connected to the steel beam 4. In this embodiment, the steel beam 4 is provided with a web T-shaped rib having the same height as the box chamber, and the node plate 1 - 2 located on one side of the steel beam 4 is welded to the T-shaped rib of the web of the steel beam 4 .

[0040] In this embodiment, the fixing rod 1-4 includes a chord 1-4-1 and a web 1-4-2. The two ends of the chord 1-4-1 respectively connect two gusset plates 1-2 on the same horizontal line, and the two ends of the web 1-4-2 respectively connect two gusset plates 1-2 in the vertical direction or the diagonal direction.

[0041] In this embodiment, the chord 1-4-1 and the web 1-4-2 are both channel steel structures, and the chord 1-4-1 and the web 1-4-2 are fixedly connected to the node plate 1-2 by welding. The steel truss 1 of the present invention has sufficient strength and rigidity to support the entire weight of the steel beam 4 and transmit the axial force and shear force between the steel beam 4 and the concrete beam 3.

[0042] like Figures 2 to 4As shown, the cantilever beam structure 2 includes a steel cantilever beam frame 2-1 and a distribution beam 2-2. The steel cantilever beam frame 2-1 is arranged above the concrete beam 3 and the steel beam 4 along the direction of the concrete beam 3 and the steel beam 4. The rear end of the steel cantilever beam frame 2-1 is connected to the concrete beam 3 through an anchoring device 5. The middle part of the steel cantilever beam frame 2-1 is rotatably connected to the top plate of the concrete beam 3 through a first hinge seat 7. The front end of the steel cantilever beam frame 2-1 is fixedly connected to the distribution beam 2-2 through a bolt assembly. The distribution beam 2-2 is arranged in a direction perpendicular to the steel cantilever beam frame 2-1. The distribution beam 2-2 is connected to the steel beam 4 through a plurality of suspension assemblies 6. Among them, the first hinge seat 7 is fixedly connected to the steel cantilever beam frame 2-1, and the first hinge seat 7 is rotatably connected to the embedded ear plate 8, which is embedded in the top plate of the concrete beam 3. With the help of the design of the first hinge seat 7, when the height of the steel beam 4 needs to be adjusted, the end of the steel cantilever beam frame 2-1 located above the concrete beam 3 can be rotated, and the lever principle can be used to make the steel cantilever beam frame 2-1 adjust the position of the steel beam 4 up and down like a seesaw, so that the vertical position of the steel beam 4 can be accurately controlled within 1 mm.

[0043] The anchoring device 5 includes an anchoring block 5-6, which is arranged below the top plate of the concrete beam 3. The anchoring block 5-6 is fixedly connected to the lower end of the connecting anchor rod 5-2. The top plate of the concrete beam 3 is provided with a reserved hole. The upper end of the connecting anchor rod 5-2 passes through the reserved hole of the top plate of the concrete beam 3 and is fixedly connected to the steel cantilever frame 2-1.

[0044] In this embodiment, two anchor blocks 5-6 are provided, and the two anchor blocks 5-6 are respectively arranged at the sloped thickened positions at both ends of the inner top wall of the concrete beam 3 to reduce the tensile stress and shear stress of the concrete. Chamfers are provided at both ends of the inner top wall of the concrete beam 3, and the anchor blocks 5-6 are provided with inclined surfaces that match the chamfered surfaces of the inner top wall of the concrete beam 3. Anti-slip rubber pads are provided on the inclined surfaces of the anchor blocks 5-6 to prevent the anchor blocks 5-6 from slipping along the inclined surfaces under the action of vertical pressure. After the connection between the anchor rod 5-2 and the anchor block 5-6 is tightened, the inclined surfaces of the anchor block 5-6 and the chamfered surfaces of the inner top wall of the concrete beam 3 fit tightly together. The anchor blocks 5-6 are designed at both ends of the inner top wall of the concrete beam 3 to effectively disperse the pressure of the anchor device 5 to the side plates of the concrete beam 3, thereby preventing the top plate in the middle part of the concrete beam 3 from being deformed or damaged due to excessive pressure.

[0045] The two anchor blocks 5-6 are fixedly connected by a spacer beam 5-1, which is a steel pipe structure with end plates at both ends. The ends of the spacer beam 5-1 are connected to the two anchor blocks 5-6 by bolt assemblies. The spacer beam 5-1 firmly connects the two anchor blocks 5-6 into a whole, providing a stable support.

[0046] A pad 5-3 is provided between the steel cantilever frame 2-1 and the top plate of the concrete beam 3. The pad 5-3 is a box-type structure welded with steel plates, and the connecting anchor rod 5-2 passes through the pad 5-3. An elastic rubber pad 5-5 is also provided between the pad 5-3 and the top plate of the concrete beam 3. A rear anchor distribution beam 5-4 is provided above the steel cantilever frame 2-1. The upper end of the connecting anchor rod 5-2 passes through the steel cantilever frame 2-1 and is fixedly connected to the rear anchor distribution beam 5-4. Among them, four connecting anchor rods 5-2 are provided. The rear anchor distribution beam 5-4 is a short distribution beam that is pressed on the steel cantilever frame 2-1 to connect and tighten the four connecting anchor rods 5-2. In this embodiment, the steel beam 4 is first lifted to an appropriate position by a lifting machine and then connected to the suspension assembly 6. When the height of the steel beam 4 needs to be adjusted at the millimeter level, the height of the steel beam 4 can be adjusted by replacing the rubber pads 5-5 of different thicknesses through the leverage of the steel cantilever frame 2-1. If more detailed height adjustment is required, the rubber pads 5-5 can be compressed by tightening the connecting anchor rods 5-2 to facilitate millimeter-level fine-tuning of the steel beam 4. After the fine-tuning is completed, the connecting anchor rods 5-2 can be locked.

[0047] The suspension assembly 6 includes a second hinge 6-1, fixedly connected to the top surface of the steel beam 4. A third hinge 6-3 is fixedly connected to the bottom surface of the distribution beam 2-2. The second hinge 6-1 is connected to the third hinge 6-3 via a steel wire rope 6-2. The second hinge 6-1 is located directly above the web of the steel beam 4, preventing significant local deformation of the steel beam 4 during temporary fixation and avoiding conflicts with the hanging basket system during concrete pouring. The entire steel cantilever beam frame 2-1 acts like a shoulder pole, allowing the steel beam 4 to be temporarily fixed at the designed height.

[0048] In this embodiment, the steel cantilever beam frame 2-1 includes two parallel steel cantilever beams with a double-jointed I-beam cross-section structure, and the distribution beam 2-2 also adopts a double-jointed I-beam cross-section structure. After the construction of the steel-concrete joint section is completed, the steel cantilever beam frame 2-1 and the distribution beam 2-2 can be dismantled and reused. In this embodiment, the steel cantilever beam frame 2-1 and the plate frame 1-1 are not arranged in the same vertical plane. The plate frame 1-1 is located in the vertical plane of the web of the concrete beam 3, and the steel cantilever beam frame 2-1 is located in the vertical plane where the inclined ribs on the inner side of the concrete beam 3 are located. The design that the steel cantilever beam frame 2-1 and the plate frame 1-1 are not arranged in the same vertical plane can effectively avoid the conflict between the steel cantilever beam frame 2-1 and the bridge crane position when hoisting the steel beam 4. At the same time, the steel cantilever beam frame 2-1 is located in the vertical plane where the inclined ribs on the inner side of the concrete beam 3 are located and as close to the web of the concrete beam 3 as possible, which can reduce the bending deformation and bending stress of the top plate of the concrete beam 3.

[0049] Based on the above structure, the present invention also discloses a construction method for temporarily fixing the steel-concrete joint section of a bridge:

[0050] Step 1: Assemble the steel truss 1. Specifically, weld the chord 1-4-1 and the web 1-4-2 to the node plate 1-2 to assemble the plate frame 1-1.

[0051] When tying the reinforcement for concrete beam 3, one side of the prefabricated steel truss 1 is installed at the concrete wet joint. Specific requirements are: the vertical center of the steel truss 1 must coincide with the vertical center of the web of concrete beam 3; the vertical plane of the steel truss 1 in the transverse direction must coincide with the vertical plane of the web of concrete beam 3; and the longitudinal position of the steel truss 1 must ensure that its node plate 1-2, with its circular holes 1-3, is flush with the end face of concrete beam 3. After the steel truss 1 is positioned, the horizontal reinforcement of the web of concrete beam 3 is passed through the circular holes 1-3, and the steel truss 1 is securely fastened to the formwork of concrete beam 3.

[0052] Step 2: When tying the reinforcement bars of the concrete beam 3 , place the embedded ear plate 8 at the designed position of the concrete beam 3 .

[0053] Step 3: pouring concrete for concrete beam 3 and curing.

[0054] Step 4: After the concrete beam 3 reaches the design strength requirement, install the cantilever beam structure 2. Specifically, when installing the cantilever beam structure 2, first place the anchor device 5 on the concrete beam 3, place one end of the steel cantilever beam frame 2-1 on the pad 5-3 of the anchor device 5, and rotate the first hinge seat 7 fixed in the middle of the steel cantilever beam frame 2-1 to connect it with the embedded ear plate 8.

[0055] Step 5: Assemble the anchoring device 5. First, place the rear anchor distribution beam 5-4 on the steel cantilever beam frame 2-1. Then install the connecting anchor rod 5-2. One end of the connecting anchor rod 5-2 is connected to the rear anchor distribution beam 5-4. The other end passes through the spacer block 5-3, rubber pad 5-5, and the reserved hole in the top plate of the concrete beam 3, and is bolted to the anchor block 5-6. The two anchor blocks 5-6 are then fixed together with the spacer beam 5-1. The initial connection between the cantilever beam structure 2 and the concrete beam 3 is achieved by adjusting the length of the connecting anchor rod 5-2.

[0056] Step 6: Fix the distribution beam 2-2 to the top of the front end of the steel cantilever beam 2-1 with the help of a bolt assembly, install the third hinge seat 6-3 on the lower end surface of the distribution beam 2-2, and install the wire rope 6-2 on the third hinge seat 6-3.

[0057] Step 7. Install the second hinge seat 6-1 on the top surface of the steel beam 4, then use the bridge crane to lift the steel beam 4 to the designed position of the bridge, and connect the second hinge seat 6-1 with the steel wire rope 6-2. In this way, the steel beam 4 and the steel cantilever frame 2-1 are connected together through the second hinge seat 6-1, the steel wire rope 6-2 and the third hinge seat 6-3. The initial position of the steel beam 4 is achieved by adjusting the length of the steel wire rope 6-2.

[0058] Step 8: Adjust the length of the connecting anchor rod 5-2 in the anchoring device 5 to achieve precise positioning of the height of the steel beam 4. Specifically, by replacing the rubber pad 5-5 with different thicknesses and screwing the connecting anchor rod 5-2 to compress the rubber pad 5-5, the height of the steel beam 4 can be fine-tuned by rotating the steel cantilever frame 2-1 supported by the first hinge seat 7. After fine-tuning, the connecting anchor rod 5-2 is locked, and the upper end slope of the anchor block 5-6 is tightly pressed against the inner top wall of the concrete beam 3.

[0059] Step 9: Weld and fix the node plate 1-2 of the steel truss 1 to the T-shaped rib of the web of the steel beam 4 to achieve a fixed connection between the steel beam 4 and the steel truss 1. At this time, the temporary connection between the steel beam 4 and the concrete beam 3 is completed.

[0060] Finally, the formwork for the wet joints is erected and the wet joint concrete is poured, with the steel truss 1 remaining in the concrete as a permanent component.

[0061] In the present invention, steel truss 1 is located within the webs of concrete beam 3 and steel beam 4, and steel cantilever frame 2-1 is located above the top plate of steel beam 4. The large distance between steel truss 1 and steel cantilever frame 2-1 reduces internal forces when loaded, and the size of the temporary connecting member is also small, reducing the cost of the temporary connection. Furthermore, the steel cantilever frame 2-1 and the first hinge seat 7 enable fine-tuning of the position of steel beam 4, making positioning more precise.

[0062] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A temporary fixing device for the construction of a steel-concrete joint section of a bridge, characterized in that: include: A steel truss (1), one side of the steel truss (1) is embedded in a concrete beam (3), the other side of the steel truss (1) is fixedly connected to the web of a steel beam (4), a portion of the steel truss (1) embedded in the concrete beam (3) is provided with a plurality of circular holes (1-3), and steel bars in the concrete beam (3) pass through the circular holes (1-3); A cantilever beam structure (2) includes a steel cantilever beam frame (2-1), the steel cantilever beam frame (2-1) is arranged above the concrete beam (3) and the steel beam (4) along the direction of the concrete beam (3) and the steel beam (4), the rear end of the steel cantilever beam frame (2-1) is connected to the concrete beam (3) through an anchoring device (5), the middle part of the steel cantilever beam frame (2-1) is rotatably connected to the top plate of the concrete beam (3) through a first hinge seat (7), and a distribution beam (2-2) is provided at the front end of the steel cantilever beam frame (2-1), and the distribution beam (2-2) is connected to the steel beam (4) through a plurality of suspension components (6).

2. The temporary fixing device for the construction of the steel-concrete joint section of a bridge according to claim 1 is characterized by: The steel truss (1) comprises two plate-shaped frames (1-1); The plate-shaped frame (1-1) comprises a node plate (1-2), the node plate (1-2) being fixedly connected via a fixing rod (1-4), the node plate (1-2) located on one side of the concrete beam (3) being provided with a plurality of circular holes (1-3), and the node plate (1-2) located on one side of the steel beam (4) being fixedly connected to the steel beam (4).

3. The temporary fixing device for the construction of the steel-concrete joint section of a bridge according to claim 1 is characterized by: The anchoring device (5) comprises an anchoring block (5-6), the anchoring block (5-6) being arranged below the top plate of the concrete beam (3), the anchoring block (5-6) being fixedly connected to the lower end of the connecting anchor rod (5-2), and the upper end of the connecting anchor rod (5-2) passing through the top plate of the concrete beam (3) and being fixedly connected to the steel cantilever beam frame (2-1).

4. The temporary fixing device for the construction of the steel-concrete joint section of a bridge according to claim 3 is characterized by: A pad (5-3) is provided between the steel cantilever beam frame (2-1) and the top plate of the concrete beam (3), a rubber pad (5-5) is provided between the pad (5-3) and the top plate of the concrete beam (3), and the connecting anchor rod (5-2) passes through the pad (5-3).

5. The temporary fixing device for the construction of the steel-concrete joint section of a bridge according to claim 3 is characterized by: Two anchor blocks (5-6) are provided, and the two anchor blocks (5-6) are respectively arranged at the sloped thickened positions at both ends of the inner top wall of the concrete beam (3). The top surface of the anchor block (5-6) is tightly matched with the slope surface of the inner top wall of the concrete beam (3), and the two anchor blocks (5-6) are fixedly connected via a pad beam (5-1).

6. The temporary fixing device for the construction of the steel-concrete joint section of a bridge according to claim 3 is characterized by: A rear anchor distribution beam (5-4) is provided above the steel cantilever beam frame (2-1), and the upper end of the connecting anchor rod (5-2) passes through the steel cantilever beam frame (2-1) and is fixedly connected to the rear anchor distribution beam (5-4).

7. The temporary fixing device for the construction of the steel-concrete joint section of a bridge according to claim 1 is characterized by: The first hinge seat (7) is rotatably connected to the embedded ear plate (8), and the embedded ear plate (8) is embedded in the top plate of the concrete beam (3).

8. The temporary fixing device for the construction of a steel-concrete joint section of a bridge according to claim 1 is characterized by: The suspension assembly (6) includes a second hinge seat (6-1), the second hinge seat (6-1) is fixedly connected to the top surface of the steel beam (4), and the second hinge seat (6-1) is located directly above the web of the steel beam (4); the bottom surface of the distribution beam (2-2) is provided with a third hinge seat (6-3), and the second hinge seat (6-1) is connected to the third hinge seat (6-3) via a steel wire rope (6-2).

9. A construction method for temporarily fixing a steel-concrete joint section of a bridge, characterized by: Step 1: Assemble the steel truss (1), install one side of the steel truss (1) to the concrete wet joint position when tying the steel bars of the concrete beam (3), pass the horizontal steel bars of the web of the concrete beam (3) through the circular hole (1-3), and firmly fix the steel truss (1) and the template of the concrete beam (3); Step 2: When tying the reinforcement bars of the concrete beam (3), the embedded ear plate (8) is placed at the designed position of the concrete beam (3); Step 3: pouring concrete of the concrete beam (3) and curing; Step 4: After the concrete beam (3) reaches the design strength requirement, install the cantilever beam structure (2); Step 5: Assembling the anchoring device (5); Step 6: Fix the distribution beam (2-2) above the front end of the steel cantilever beam frame (2-1), and install the third hinge seat (6-3) and the steel wire rope (6-2) on the lower end surface of the distribution beam (2-2); Step 7: Install a second hinge seat (6-1) on the top surface of the steel beam (4), use a bridge crane to lift the steel beam (4) to the designed bridge position, connect the second hinge seat (6-1) and the steel wire rope (6-2), and achieve preliminary positioning of the steel beam (4) by adjusting the length of the steel wire rope (6-2); Step 8: fine-tuning the height of the steel beam (4) by adjusting the length of the connecting anchor rod (5-2); after the fine-tuning is completed, locking the connecting anchor rod (5-2); Step nine: Weld and fix the node plate (1-2) to the T-shaped rib of the web of the steel beam (4).

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