Shear-resistant reinforcing device for hinge joint steel plate of middle plate of existing hollow plate girder bridge

Abstract

The utility model relates to an existing hollow plate girder bridge middle plate hinge joint steel plate shear-resistant reinforcing device which comprises a girder bridge composed of a plurality of hollow plates, hinge joints are formed between every two adjacent hollow plates, reinforcing steel plates are embedded in the hinge joints, and each reinforcing steel plate is composed of channel steel and a steel plate. The channel steel longitudinally and horizontally extends, the steel plate is vertically and fixedly connected to the lower end of the channel steel so as to be inserted and embedded into the hinge joint, the transversely adjacent hollow plates are fixedly connected with the reinforcing steel plate by filling a joint pouring material, and the longitudinally adjacent hollow steel plates are fixedly connected with the reinforcing steel plate through a continuous cast-in-place section; the shear-resistant reinforcing device is reasonable in structure and good in mechanical property, the steel plates and the channel steel are additionally arranged by fully utilizing the hinge joints between the hollow slabs and the space of the pavement layer, and therefore the shear-resistant and bending-resistant bearing capacity of the hollow slab bridge structure can be improved, the transverse connecting capacity between the hollow slabs can be improved, and the service life of the hollow slabs is prolonged. In the old bridge reinforcing process, the modification cost is low, and the construction method is simple, convenient and practical.

Description

Technical Field

[0001] The utility model relates to a shear reinforcement device for a hinged seam steel plate in a middle plate of an existing hollow slab beam bridge. Background Art

[0002] Concrete hollow slabs offer advantages such as ease of construction and mature technology, making them suitable for small and medium-span bridges. They are widely used in highway bridge construction. However, the hollow slabs of older highway bridges in my country suffer from technical deficiencies in materials, bridge design, construction, management, and maintenance. With increasing load levels and the frequent use of heavy vehicles, many hollow slab bridges still within their service life are beginning to experience insufficient load-bearing capacity. Directly dismantling and rebuilding these hollow slabs is costly and time-consuming. Using appropriate reinforcement techniques can avoid excessive costs while ensuring normal use within their designed service life. To address these issues, a promising approach is to utilize hinged joints to insert steel plates for flexural and shear reinforcement of hollow slabs. Applying this shear reinforcement to the midslabs of hollow slab beam bridges offers significant economic benefits and reinforcement effectiveness. Utility Model Content

[0003] In view of the deficiencies in the existing technology, the technical problem to be solved by the present invention is to provide a shear reinforcement device for the hinged joint steel plate in the middle plate of an existing hollow slab beam bridge, which can effectively improve the shear and bending bearing capacity of the hollow slab bridge structure and improve the lateral connection capacity between hollow slabs, and has low modification cost and simple and practical construction method.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a shear reinforcement device for the hinged joint steel plate in the middle plate of an existing hollow slab beam bridge, comprising a beam bridge composed of a plurality of hollow slabs, hinged joints are opened between adjacent hollow slabs and reinforcing steel plates are inserted in the hinged joints, the reinforcing steel plates are composed of channel steels and steel plates, the channel steels extend horizontally longitudinally and the steel plates are vertically fixed to the lower ends of the channel steels to be inserted into the hinged joints, the hollow slabs adjacent to each other in the transverse direction are fixed to the reinforcing steel plates by filling the grouting material, and the hollow steel plates adjacent to each other in the longitudinal direction are fixed to the reinforcing steel plates by continuous cast-in-place sections.

[0005] Furthermore, steel plates are fixedly connected to the bottoms of both longitudinal ends of the channel steel to be inserted into the hinged joints of the longitudinally adjacent hollow plates.

[0006] Furthermore, the wing plates on both sides of the channel steel are provided with a plurality of circular holes spaced apart along the length direction thereof, and the circular holes on the wing plates on both sides correspond one to one to arrange the pavement layer steel bars.

[0007] Furthermore, a trapezoidal hinged joint steel beam is horizontally installed in the hinged joint, and the hinged joint steel beam is composed of a horizontal glued joint steel bar and two waist steel bars. The other ends of the waist steel bars are fixed to the hollow slab. The hinged joint steel beam is arranged in multiple groups at intervals along the longitudinal direction and supported at the lower end of the steel plate.

[0008] Furthermore, the length of the steel plate inserted into the hinge joint is twice the height of the hollow slab beam, and the thickness is greater than or equal to 8 mm.

[0009] Furthermore, the longitudinal length of the channel steel is the sum of the longitudinal length of the continuous cast-in-place section and four times the height of the hollow slab beam. The height of the channel steel must allow the transverse steel bars of the pavement layer steel mesh to pass through and bear the force together with the pavement layer. The transverse width of the channel steel is greater than the opening width at the top of the hinged joint.

[0010] Compared with existing technologies, this utility model has the following advantages: It can reinforce bridges without changing the load-bearing characteristics of the bridge, minimizing reinforcement costs and risks. It can effectively improve the shear and bending load-bearing capacity of hollow slab bridge structures and enhance the lateral connection capacity between hollow slabs. It also offers low modification costs and a simple and practical construction method. The device is simple in structure, requires minimal construction and maintenance time, shortens the overall construction cycle, and offers excellent reinforcement economics.

[0011] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 This is a schematic diagram of the connection of two longitudinally adjacent hollow plates in an embodiment of the present utility model;

[0014] Figure 3 It is a three-dimensional diagram of an embodiment of the present utility model.

[0015] In the figure: 1-hollow slab, 2-beam bridge, 3-hinge joint, 4-reinforced steel plate, 5-channel steel, 6-steel plate, 7-grouting material, 8-continuous cast-in-place section, 9-circular hole, 10-hinge joint steel beam, 11-glue joint steel bar, 12-waist steel bar, 13-pavement layer steel bar. DETAILED DESCRIPTION

[0016] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description.

[0017] like Figures 1-3As shown, a shear reinforcement device for the hinged joint steel plate in the middle plate of an existing hollow slab beam bridge includes a beam bridge 2 composed of a plurality of hollow slabs 1, hinged joints 3 are provided between adjacent hollow slabs, and reinforcing steel plates 4 are inserted into the hinged joints, the reinforcing steel plates are composed of U-shaped channel steels 5 and steel plates 6, the channel steels extend horizontally in the longitudinal direction and the steel plates are vertically fixed to the lower ends of the channel steels to be inserted into the hinged joints, the hollow slabs adjacent in the transverse direction are fixed to the reinforcing steel plates by filling with grouting materials 7, and the hollow steel plates adjacent in the longitudinal direction are fixed to the reinforcing steel plates by continuous cast-in-situ sections 8.

[0018] In an embodiment of the present invention, steel plates are symmetrically fixed to the bottoms of both longitudinal ends of the channel steel to be inserted into the hinged joints of two longitudinally adjacent hollow plates.

[0019] In the embodiment of the present invention, the wing plates on both sides of the channel steel are provided with a plurality of circular holes 9 spaced apart along the length direction thereof, and the circular holes on the wing plates on both sides correspond one to one to arrange the pavement layer steel bars 13 .

[0020] In the embodiment of the present utility model, a trapezoidal hinged joint steel beam 10 is horizontally installed in the hinged joint. The hinged joint steel beam is composed of a horizontal glued joint steel bar 11 and two waist steel bars 12. The other ends of the waist steel bars are fixed to the hollow slab. The hinged joint steel beam is arranged in multiple groups at intervals along the longitudinal direction and supported at the lower end of the steel plate.

[0021] In an embodiment of the present invention, the length of the steel plate inserted into the hinged joint is twice the height of the hollow slab beam, and the thickness is greater than or equal to 8 mm.

[0022] In an embodiment of the present utility model, the longitudinal length of the channel steel is the sum of the longitudinal length of the continuous cast-in-place section and four times the height of the hollow slab beam. The height of the channel steel must allow the transverse steel bars of the pavement layer steel mesh to pass through and bear the force together with the pavement layer. The transverse width of the channel steel is greater than the opening width at the top of the hinged joint.

[0023] In the embodiment of the present invention, a construction method for a shear reinforcement device for a hinged joint steel plate in a hollow slab girder bridge is provided, and the method is carried out in the following steps:

[0024] S1: Clean the original pavement layer and hinge joints of the bridge deck, and process and weld the steel plates and channel steels in the factory according to the design dimensions and requirements;

[0025] S2: After the steel plate and channel steel are processed and welded according to the design dimensions and requirements, the steel plate is inserted into the hinged joint as a whole and fixed to a specific position supported by the hinged joint steel beam installed inside.

[0026] S3: Filling the gap between the hinged joint and the reinforced steel plate with caulking material;

[0027] S4: Insert the pavement reinforcement into the circular holes on both sides of the channel steel to ensure the overall lateral stability of the bridge;

[0028] S5: Restore the bridge deck pavement and other road structures to complete the overall reinforcement of the bridge.

[0029] Scaled test studies have shown that the shear bearing capacity of the beams reinforced with hinged steel plates is significantly better than that of the control beams. The shear performance of the beams is greatly improved after reinforcement, and the appearance and development of cracks are effectively suppressed. The cracking load is increased by 46.2% and the ultimate load is increased by 42.6%.

[0030] This utility model is not limited to the above-mentioned preferred embodiment. Based on the inspiration of this utility model, anyone can derive various other forms of shear reinforcement devices for hinged joint steel plates in existing hollow slab beam bridges. All equivalent changes and modifications made within the scope of the patent application of this utility model shall fall within the scope of this utility model.

Claims

1. A shear reinforcement device for the hinged joint steel plate in an existing hollow slab girder bridge, characterized by: The invention comprises a beam bridge composed of a plurality of hollow slabs, wherein hinged joints are provided between adjacent hollow slabs and reinforcing steel plates are inserted into the hinged joints, wherein the reinforcing steel plates are composed of U-shaped channel steels and steel plates, wherein the channel steels extend longitudinally and horizontally and the steel plates are vertically fixedly connected to the lower ends of the channel steels so as to be inserted into the hinged joints, wherein the hollow slabs adjacent to each other in the transverse direction are fixedly connected to the reinforcing steel plates by filling the joints with grouting materials, and wherein the hollow steel plates adjacent to each other in the longitudinal direction are fixedly connected to the reinforcing steel plates by continuous cast-in-place sections.

2. The shear reinforcement device for the hinged joint steel plate in the middle slab of an existing hollow slab girder bridge according to claim 1 is characterized by: The bottoms of both longitudinal ends of the channel steel are fixedly connected with steel plates to be inserted into the hinged seams of the longitudinally adjacent hollow plates.

3. The shear reinforcement device for the hinged joint steel plate in the middle plate of an existing hollow slab girder bridge according to claim 1 is characterized by: The wing plates on both sides of the channel steel are provided with a plurality of circular holes spaced apart along the length direction thereof, and the circular holes on the wing plates on both sides correspond one to one to arrange the pavement layer steel bars.

4. The shear reinforcement device for the hinged joint steel plate in the middle slab of an existing hollow slab girder bridge according to claim 1 is characterized by: Trapezoidal hinged joint steel beams are horizontally arranged in the hinged joints. The hinged joint steel beams are composed of horizontal glued joint steel bars and two waist steel bars. The other ends of the waist steel bars are fixed to the hollow slabs. Multiple groups of hinged joint steel beams are arranged at intervals along the longitudinal direction and supported at the lower end of the steel plate.

5. The shear reinforcement device for the hinged joint steel plate in the middle slab of an existing hollow slab girder bridge according to claim 1 is characterized by: The length of the steel plate inserted into the hinge joint is twice the height of the hollow slab beam and the thickness is greater than or equal to 8mm.

6. The shear reinforcement device for the hinged joint steel plate in the middle plate of an existing hollow slab girder bridge according to claim 1 is characterized by: The longitudinal length of the channel steel is the sum of the longitudinal length of the continuous cast-in-place section and four times the height of the hollow slab beam. The height of the channel steel is higher than the pavement layer steel bars and the steel bars therein pass through and bear the force together with the pavement layer steel bars. The transverse width of the channel steel is greater than the opening width at the top of the hinged joint.

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