Fabricated prefabricated steel plate cage-concrete bridge pier column structure and construction method thereof

Abstract

The invention relates to the technical field of highway bridge construction, and particularly discloses a fabricated prefabricated steel plate cage-concrete bridge pier column structure and a construction method thereof. According to the assembly type prefabricated steel plate cage-concrete bridge pier column structure, the prefabricated steel plate cage is adopted to replace a traditional steel reinforcement cage, the technical advantages of factory assembly line production of a steel structure can be effectively exerted, the adverse effect caused by manual operation is effectively reduced, and the construction efficiency and the quality guarantee degree are improved; the prefabricated steel plate cage is formed by bending a perforated steel plate, concrete is combined with the prefabricated steel plate cage through slurry passing holes in the steel plate, the concrete in the slurry passing holes plays a shear resisting role, the plate steel-concrete bonding performance is improved, annular shear force grooves are evenly formed in the prefabricated steel plate cage, and the better anti-sliding performance is achieved on the steel-concrete bonding face. The transverse steel plates and the vertical steel plates of the prefabricated steel plate cage have the same functions as stirrups and main reinforcements of the reinforcement cage, and the steel plate cage is better in integrity, so that the restraining effect on core concrete can be fully exerted, and the overall compression resistance is improved.

Description

Technical Field

[0001] This invention relates to the field of highway bridge construction technology, and in particular to a prefabricated steel plate cage-concrete bridge pier structure and its construction method. Background Technology

[0002] The substructure of highway bridges generally adopts a reinforced cage-concrete pier structure. The construction of the reinforced concrete pier structure involves connecting vertical reinforcing bars and circumferential stirrups to form a reinforcing cage, followed by concrete pouring. Although CNC machining of reinforcing bars has been achieved in the fabrication of reinforcing cages, manual tying is still required, resulting in insufficient work efficiency. Inadequate quality control in reinforcing bar tying can lead to problems such as non-design spacing and exposed ends of tying wires. Furthermore, improper tying can cause misalignment of the reinforcing bars due to the impact of concrete pouring, resulting in issues such as non-designed protective layers and incorrect reinforcing bar spacing after construction.

[0003] Therefore, there is an urgent need to provide a prefabricated steel plate cage-concrete bridge pier structure to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a prefabricated steel plate cage-concrete bridge pier structure and its construction method to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides a prefabricated steel plate cage-concrete bridge pier structure, comprising a prefabricated steel plate cage-concrete pier, a foundation, and a prefabricated cap beam. The prefabricated steel plate cage is housed inside the prefabricated steel plate cage-concrete pier. Multiple grouting holes are provided on the side walls of the prefabricated steel plate cage. Positioning components are provided at both ends of the prefabricated steel plate cage. Pre-reserved grooves are provided at the top of the foundation and the bottom of the prefabricated cap beam. Positioning connectors are fixedly installed within the pre-reserved grooves, and the positioning connectors are adapted to the positioning components. The foundation is fixedly installed at the bottom of the prefabricated steel plate cage-concrete pier, and the prefabricated cap beam is fixedly installed at the top of the prefabricated steel plate cage-concrete pier. Grouting holes and air holes are provided at the top of the prefabricated cap beam, and both the grouting holes and the air holes communicate with the pre-reserved grooves on the prefabricated cap beam.

[0006] Preferably, the outer wall of the precast steel cage is provided with multiple annular shear grooves at equal intervals along the central axis.

[0007] Preferably, the prefabricated steel cage is made of steel mesh through bending and welding.

[0008] Preferably, the steel mesh is made by cutting holes in a shaped steel plate.

[0009] Preferably, the steel mesh is manufactured by integral casting.

[0010] Preferably, the positioning component is a comb-shaped connector, and the positioning connector has multiple insertion holes along the circumferential direction. The comb-shaped connector is connected to the positioning connector through the insertion holes.

[0011] Preferably, the interior of the precast steel plate cage-concrete pier is further provided with an extrusion sleeve, which is fitted at the connection between two adjacent precast steel plate cages.

[0012] Preferably, the thickness of the precast steel cage is not less than 16mm; the width of the grout passage hole is 50mm to 300mm, the length of the grout passage hole is not greater than 400mm, and the distance between two adjacent grout passage holes is not less than the thickness of the precast steel cage; the width of the annular shear groove is not less than 0.9mm, the depth of the annular shear groove is not less than 1.5mm, and the distance between two adjacent annular shear grooves is not less than 10mm.

[0013] A construction method for a prefabricated steel cage-concrete bridge pier structure includes the following steps:

[0014] Fabrication of precast steel cages;

[0015] The foundation and precast cap beam are reinforced with steel bars, and positioning connectors are welded onto the steel bars of the foundation and precast cap beam.

[0016] Erect formwork and carry out concrete pouring and curing for precast steel plate cages, concrete piers, foundations, and precast cap beams.

[0017] Lifting and installation of precast steel plate cages, concrete piers, and precast cap beams;

[0018] The connection positions between the precast steel plate cage-concrete pier and the foundation, and between the precast steel plate cage-concrete pier and the precast cap beam, are inspected.

[0019] Preferably, the fabrication of the precast steel cage includes the following steps:

[0020] Process expanded metal mesh and pre-install comb-shaped joints at both ends of the expanded metal mesh;

[0021] The steel mesh is bent using a CNC bending machine, and the two contact edges of the bent steel mesh are welded together to form a prefabricated steel cage.

[0022] Based on the designed height of the precast steel plate cage-concrete pier, the comb-shaped joints of multiple precast steel plate cages are connected sequentially, and the connection between adjacent precast steel plate cages is fixed.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] 1. The prefabricated steel plate cage-concrete bridge pier structure provided by the present invention uses prefabricated steel plate cages to replace traditional steel reinforcement cages, which can effectively leverage the technical advantages of steel structure factory assembly line production, effectively reduce the adverse effects of manual operation, and improve construction efficiency and quality assurance.

[0025] 2. The horizontal and vertical steel plates of the precast steel plate cage serve the same function as the stirrups and main reinforcement bars of the steel cage. However, the steel plate cage has better overall integrity, which can fully exert its restraining effect on the core concrete and improve the overall compressive strength. In addition, the better integrity of the steel plate cage can also significantly improve the overall ductility of the pier column, giving it a clear advantage in terms of seismic mechanical performance.

[0026] 3. The precast steel cage still has a concrete protective layer on the outside, which avoids direct contact between the steel structure and the external environment. There is no need to spray anti-corrosion coating, which reduces economic costs and can effectively reduce steel structure corrosion problems, improve structural durability, and achieve better overall economic benefits.

[0027] 4. Precast steel plate cages are formed by bending perforated steel plates. Concrete bonds to the precast steel plate cage through grouting holes in the steel plates. The concrete within the grouting holes provides shear resistance, improving the steel-concrete bond performance. Evenly distributed annular shear grooves on the precast steel plate cage further enhance the bond between the concrete and the cage, improving overall integrity. Compared to steel-concrete composite structures, it exhibits better anti-slip performance at the steel-concrete interface.

[0028] 5. The precast steel plate cage-concrete piers are connected to the abutments and precast cap beams using comb-shaped joints and positioning connectors. Concrete is then poured into the pre-reserved grooves for connection and reinforcement. This enables rapid construction of the bridge substructure based on the precast steel plate cage-concrete pier structure, avoids on-site welding operations, and effectively improves construction efficiency and safety. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the construction of the prefabricated steel plate cage-concrete bridge pier structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the precast steel cage-concrete pier structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the steel mesh structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the prefabricated steel cage of the present invention;

[0034] Figure 5 This is a schematic diagram of the positioning connector of the present invention;

[0035] In the diagram: 1. Precast steel plate cage-concrete pier; 2. Pier cap; 3. Precast cap beam; 4. Precast steel plate cage; 5. Grouting hole; 6. Comb-shaped joint; 7. Annular shear groove; 8. Extrusion sleeve; 9. Reserved groove; 10. Positioning connector; 11. Insertion hole; 12. Grouting hole; 13. Air hole. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] like Figures 1 to 5 As shown, the present invention provides a prefabricated steel plate cage-concrete bridge pier structure, including a prefabricated steel plate cage-concrete pier 1, a pier cap 2, and a prefabricated cap beam 3. A prefabricated steel plate cage 4 is installed inside the prefabricated steel plate cage-concrete pier 1. Multiple grouting holes 5 are provided on the side walls of the prefabricated steel plate cage 4, and positioning components are provided at both ends of the prefabricated steel plate cage 4. A reserved groove 9 is provided at the top of the pier cap 2 and the bottom of the prefabricated cap beam 3. A positioning connector 10 is fixedly installed in the reserved groove 9, and the positioning connector 10 is adapted to the positioning components. The pier cap 2 is fixedly installed at the bottom of the prefabricated steel plate cage-concrete pier 1, and the prefabricated cap beam 3 is fixedly installed at the top of the prefabricated steel plate cage-concrete pier 1. A grouting hole 12 and an air hole 13 are provided at the top of the prefabricated cap beam 3, and both the grouting hole 12 and the air hole 13 are connected to the reserved groove 9 on the prefabricated cap beam 3.

[0038] The scheme was further optimized by setting multiple annular shear grooves 7 at equal intervals along the central axis on the outer wall of the precast steel cage 4.

[0039] The scheme was further optimized, and the prefabricated steel cage 4 was made of steel mesh through bending and welding.

[0040] Further optimization of the scheme involves either using pre-cut steel plates to create the expanded metal mesh or using integral casting to form the expanded metal mesh.

[0041] The scheme is further optimized. The positioning component is a comb-shaped connector 6. The positioning connector 10 has multiple insertion holes 11 along the circumferential direction. The comb-shaped connector 6 is connected to the positioning connector 10 through the insertion holes 11.

[0042] To further optimize the design, an extrusion sleeve 8 is installed inside the precast steel plate cage-concrete pier 1, and the extrusion sleeve 8 is fitted at the connection between two adjacent precast steel plate cages 4.

[0043] Further optimization of the scheme: the thickness of the precast steel cage 4 is not less than 16mm; the width of the grout passage hole 5 is 50mm to 300mm, the length of the grout passage hole 5 is not greater than 400mm, and the distance between two adjacent grout passage holes 5 is not less than the thickness of the precast steel cage 4; the width of the annular shear groove 7 is not less than 0.9mm, the depth of the annular shear groove 7 is not less than 1.5mm, and the distance between two adjacent annular shear grooves 7 is not less than 10mm.

[0044] A construction method for a prefabricated steel cage-concrete bridge pier structure includes the following steps:

[0045] Fabrication of prefabricated steel cage 4;

[0046] The foundation 2 and the precast cap beam 3 are reinforced with steel bars, and positioning connectors 10 are welded on the steel bars of the foundation 2 and the precast cap beam 3. The size, position and shape of the insertion hole 11 of the positioning connector 10 correspond to the comb-shaped connector 6, and are uniformly produced in the steel structure processing plant.

[0047] Erect formwork and pour and cure concrete for precast steel plate cage-concrete pier 1, pile cap 2 and precast cap beam 3; when pouring precast steel plate cage-concrete pier 1, take protective measures for the comb-shaped joints 6 at both ends of the precast steel plate cage 4, erect formwork and pour concrete, and cure for 28 days to make precast steel plate cage-concrete pier 1.

[0048] The hoisting and installation of precast steel plate cage-concrete pier 1 and precast cap beam 3; after the precast steel plate cage-concrete pier 1 is transported to the site, it is hoisted to the designated position, and the bottom comb-shaped joint 6 is inserted into the positioning connector 10 in the reserved groove 9 of the pier 2. Concrete is poured into the reserved groove 9 for connection; the precast cap beam 3 is made in the prefabrication yard. The top of the precast cap beam 3 has grouting holes 12 and air holes 13. The precast cap beam 3 is hoisted, and the comb-shaped joint 6 at the upper end of the precast steel plate cage-concrete pier 1 is inserted into the positioning connector 10 in the precast cap beam 3. The template is installed at the bottom of the reserved groove 9 of the precast cap beam 3, and grouting is performed through the grouting holes at the top of the precast cap beam 3 for connection;

[0049] The connection positions between the precast steel plate cage-concrete pier 1 and the foundation 2, and between the precast steel plate cage-concrete pier 1 and the precast cap beam 3, were inspected to check the grouting density, and the grouting holes and air holes 13 were sealed.

[0050] Further optimization of the scheme, the fabrication of precast steel cage 4 includes the following steps:

[0051] Steel mesh processing: Steel mesh is manufactured in steel structure processing plants by integral casting or by purchasing pre-formed plates and cutting and grooving. Comb-shaped joints are reserved at both ends of the steel mesh.

[0052] The steel mesh is bent using a CNC bending machine, and the two contact edges of the bent steel mesh are welded together to form a prefabricated steel cage 4;

[0053] According to the designed height of the precast steel plate cage-concrete pier 1, the comb-shaped joints 6 of multiple precast steel plate cages 4 are connected in sequence, and the connection between two adjacent precast steel plate cages 4 is fixed by extrusion sleeves 8 or welding.

[0054] The prefabricated steel plate cage-concrete bridge pier structure provided by this invention uses a prefabricated steel plate cage 4 to replace the traditional steel reinforcement cage, which can effectively leverage the technical advantages of steel structure factory assembly line production, effectively reduce the adverse effects of manual operation, and improve construction efficiency and quality assurance.

[0055] Precast steel plate cages 4-concrete components differ from steel pipe concrete structures. The exterior of the precast steel plate cage 4 still has a concrete protective layer, which avoids direct contact between the steel structure and the external environment. It does not require the application of anti-corrosion coatings, resulting in lower economic costs. It can also effectively reduce steel structure corrosion problems, improve structural durability, and has better overall economic benefits.

[0056] The horizontal and vertical steel plates of the precast steel plate cage 4 serve the same function as the stirrups and main reinforcement bars of the steel cage. However, the steel plate cage has better overall integrity, which can fully exert its restraining effect on the core concrete and improve the overall compressive strength. In addition, the better integrity of the steel plate cage can also significantly improve the overall ductility of the pier column, and has obvious advantages in terms of seismic mechanical performance.

[0057] The precast steel plate cage 4 is formed by bending perforated steel plates. Concrete is bonded to the precast steel plate cage 4 through grouting holes 5 on the steel plates. The concrete within the grouting holes 5 provides shear resistance, improving the steel-concrete bond performance. Annular shear grooves 7 are evenly distributed on the precast steel plate cage 4, further enhancing the bond between the concrete and the precast steel plate cage 4 and improving overall integrity. Compared to steel-concrete composite structures, it exhibits better anti-slip performance at the steel-concrete interface.

[0058] The precast steel plate cage-concrete pier 1 is connected to the abutment 2 and the precast cap beam 3 by inserting comb-shaped joints 6 and positioning connectors 10. Concrete is poured into the reserved groove 9 for connection and reinforcement, which realizes the rapid construction of the bridge substructure based on the precast steel plate cage-concrete pier 1 structure, avoids on-site welding operations, and can effectively improve construction efficiency and safety.

[0059] Example

[0060] The steel mesh is made of 16mm thick steel plate. The grout passage hole 5 is formed by CNC cutting machine. The size of the grout passage hole 5 is 200mm long × 50mm wide, and the horizontal and vertical spacing is 40mm.

[0061] The steel mesh is constructed using a grooving machine to create annular shear grooves 7. The annular shear grooves 7 are laid out horizontally with a depth of 1.5mm and a width of 10mm, and are evenly laid out vertically at a spacing of 12mm.

[0062] The steel mesh has comb-shaped joints 6 at both ends, and the length of the comb-shaped joints 6 is no more than 200mm.

[0063] The steel mesh is bent into a cylindrical shape using a CNC bending machine, with a diameter of 1.5 meters after bending. The two butt joints are welded together to form a prefabricated steel cage 4.

[0064] Two precast steel plate cages 4 are joined together by comb-shaped joints 6 and mechanically connected by extrusion sleeves 8.

[0065] The concrete protective layer on the outside of the precast steel cage 4 is 35mm thick. No concrete is poured into the comb-shaped joints 6 at both ends of the precast steel cage 4 and the row of grouting holes 5 below them. Instead, formwork is erected for concrete pouring to form the precast steel cage-concrete pier 1.

[0066] The positioning connector 10 is manufactured in the steel bar processing plant. It is a ring shape. The positioning connector 10 has a plug hole 11 cut on it. The position of the plug hole 11 corresponds to the comb-shaped connector 6. The size of the plug hole 11 is 40mm×16mm.

[0067] Both the foundation 2 and the precast cap beam 3 are provided with reserved grooves 9. The cross-sectional area of ​​the reserved grooves 9 is larger than the cross-sectional area of ​​the precast steel cage-concrete pier column 1, and the depth of the reserved grooves 9 is greater than 440mm. The positioning connectors 10 are installed in the reserved grooves 9 and welded to the internal reinforcing bars.

[0068] The precast cap beam 3 has pre-reserved grouting holes and air holes 13, which are connected to the pre-reserved groove 9.

[0069] During assembly, the precast steel plate cage-concrete pier column 1 is first hoisted, and the lower comb-shaped joint 6 is inserted into the positioning connector 10 inside the pier cap 2. Then, concrete is poured and cured to reach the design strength.

[0070] The precast cap beam 3 is hoisted, and the positioning connector 10 in the reserved groove 9 is inserted into the comb-shaped joint 6 at the upper end of the precast steel plate cage-concrete pier 1. A formwork is erected at the lower part of the reserved groove 9 of the precast cap beam 3, and concrete is poured from the grouting hole. After the pouring is completed, the compactness of the pouring in the reserved groove 9 is tested. After the test is qualified, the concrete is cured and the formwork is removed after the design strength is reached.

[0071] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A fabricated precast steel plate cage-concrete bridge pier column structure, characterized in that, The utility model provides a prefabricated steel plate cage - concrete pier column (1), bearing platform (2) and prefabricated bent cap (3), the inside of prefabricated steel plate cage - concrete pier column (1) is provided with prefabricated steel plate cage (4), be provided with a plurality of grout holes (5) on the lateral wall of prefabricated steel plate cage (4), both ends of prefabricated steel plate cage (4) are provided with positioning assembly;The top of bearing platform (2) and the bottom of prefabricated bent cap (3) are provided with reserved slot (9), and the reserved slot (9) is fixedly provided with positioning connecting piece (10), and the positioning connecting piece (10) is matched with the positioning assembly;Bearing platform (2) is fixedly arranged at the bottom of prefabricated steel plate cage - concrete pier column (1), and prefabricated bent cap (3) is fixedly arranged at the top of prefabricated steel plate cage - concrete pier column (1);The top of prefabricated bent cap (3) is provided with grouting hole (12) and air hole (13), and the grouting hole (12) and the air hole (13) are communicated with the reserved slot (9) on the prefabricated bent cap (3).

2. The fabricated precast steel panel cage-concrete bridge pier column structure according to claim 1, characterized in that, A plurality of annular shear grooves (7) are equidistantly arranged on the outer wall of the prefabricated steel plate cage (4) along the central axis direction.

3. The fabricated precast steel panel cage-concrete bridge pier column structure according to claim 1, characterized in that, The prefabricated steel plate cage (4) is made by bending and welding of steel sheet mesh.

4. The fabricated precast steel panel cage-concrete bridge pier column structure according to claim 3, characterized in that, The steel sheet mesh is made by cutting and opening of shaped steel sheet.

5. The fabricated precast steel panel cage-concrete bridge pier column structure according to claim 3, characterized in that, The steel sheet mesh is made by integral casting.

6. The fabricated precast steel panel cage-concrete bridge pier column structure according to claim 1, characterized in that, The positioning assembly is a comb-tooth joint (6), a plurality of insertion holes (11) are formed on the positioning connecting piece (10) along the circumferential direction, and the comb-tooth joint (6) is connected with the positioning connecting piece (10) through the insertion holes (11).

7. The fabricated precast steel panel cage-concrete bridge pier column structure according to claim 6, characterized in that, The prefabricated steel plate cage - concrete pier column (1) further comprises an extrusion sleeve (8) arranged in the connection part of the adjacent two prefabricated steel plate cages (4). 8.The fabricated precast steel plate cage-concrete bridge pier column structure of claim 2, wherein, The thickness of the prefabricated steel plate cage (4) is not less than 16 mm; the width of the grout hole (5) is 50-300 mm, the length of the grout hole (5) is not greater than 400 mm, and the distance between the adjacent two grout holes (5) is not less than the thickness of the prefabricated steel plate cage (4); the width of the annular shear groove (7) is not less than 0.9 mm, the depth of the annular shear groove (7) is not less than 1.5 mm, and the distance between the adjacent two annular shear grooves (7) is not less than 10 mm.

9. The construction method of the fabricated precast steel plate cage-concrete bridge pier column structure according to any one of claims 1-8, characterized in that, The method comprises the following steps: manufacturing the prefabricated steel plate cage (4); binding the reinforcement of the bearing platform (2) and the prefabricated bent cap (3), and welding the positioning connecting piece (10) on the reinforcement of the bearing platform (2) and the prefabricated bent cap (3); erecting the formwork and pouring and curing the concrete of the prefabricated steel plate cage - concrete pier column (1), the bearing platform (2) and the prefabricated bent cap (3); hoisting and installing the prefabricated steel plate cage - concrete pier column (1) and the prefabricated bent cap (3); detecting the connection positions between the prefabricated steel plate cage - concrete pier column (1) and the bearing platform (2), and between the prefabricated steel plate cage - concrete pier column (1) and the prefabricated bent cap (3).

10. The construction method of the fabricated precast steel panel cage-concrete bridge pier column structure according to claim 9, characterized in that, The manufacturing of the prefabricated steel plate cage (4) comprises the following steps: processing the steel sheet mesh and reserving the comb-tooth joint (6) at both ends of the steel sheet mesh; The steel plate net is bent by using a numerical control bending equipment, and the two contact edges of the bent steel plate net are welded to form a prefabricated steel plate cage (4); According to the height of the designed prefabricated steel plate cage-concrete pier column (1), the comb-shaped joints (6) of the plurality of prefabricated steel plate cages (4) are sequentially butted, and the connection between the adjacent two prefabricated steel plate cages (4) is fixed.

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