Prestressed carbon fiber plate reinforced hollow slab and construction method thereof

Abstract

The application relates to a prestressed carbon fiber plate reinforced hollow slab and a construction method thereof, and the scheme comprises the following steps: step one, removing the upper structure layer of the bridge slab: removing the upper structure layer of the bridge slab; step two, installing a hanging construction platform: installing the hanging construction platform at the lower part of the slab, installing a top cross beam, a fixed channel steel and a supporting hoist at the upper part of the slab to support the hanging construction platform, and fixing the upper part of the supporting hoist through a gasket and a fixing bolt; step three, treating the surface of the bridge; step four, installing the prestressed carbon fiber plate of the bridge; step five, tensioning the carbon fiber plate; and step six, conducting heat preservation and maintenance construction. The application can effectively reduce the engineering cost, accelerate the construction speed, and can obtain better technical and economic benefits in practical engineering.

Description

Technical Field

[0001] This application relates to the field of civil engineering technology, specifically to the reinforcement of hollow slabs with prestressed carbon fiber plates and their construction methods. Background Technology

[0002] Prestressed carbon fiber plate bridge reinforcement technology is a new reinforcement technology that has been developed in recent years. Carbon fiber plates, due to their superior material properties and convenient and quick application, are widely used in bridge reinforcement at present. Prestressed carbon fiber plate bridge reinforcement technology is an active reinforcement method that combines the lightweight and high-strength characteristics of bonded carbon fiber reinforcement technology. It has a significant effect on improving the load-bearing performance of old bridges, mitigating crack development, and reducing bridge deflection. Therefore, this method has a promising development trend in the reinforcement and strengthening of old bridges.

[0003] However, traditional construction methods for reinforcing hollow slabs with prestressed carbon fiber plates have drawbacks such as difficulty in setting up the reinforcement construction platform, poor installation and positioning accuracy of the prestressed carbon fiber plates, and difficulty in thermal insulation and curing of the carbon fiber plate-reinforced structure.

[0004] Therefore, there is an urgent need for a method for reinforcing hollow slabs with prestressed carbon fiber plates and its construction that can guarantee construction quality and improve construction efficiency.

[0005] Application content The purpose of this application is to address the aforementioned problems in the prior art by providing a method for reinforcing hollow slabs with prestressed carbon fiber plates and a construction method thereof.

[0006] To achieve the above-mentioned objectives, this application adopts the following technical solution: The construction method for reinforcing hollow slabs with prestressed carbon fiber plates includes the following steps: Step 1: Demolition of the bridge superstructure: Demolish the upper structural layer of the bridge beams and slabs; Step 2, Installation of the suspended construction platform: Install the suspended construction platform under the beam and slab, and install the top crossbeam, fixed channel steel and support rods on the upper part of the beam and slab to support the suspended construction platform. The upper part of the support rods is fixed with shims and fixing bolts. Step 3, Bridge Surface Treatment: Grind the lower surface of the beams and slabs, reinforce the adjacent beams and slabs with steel plates and tie bars, and install shear studs on the upper part of the beams and slabs; Step 4: Installation of prestressed carbon fiber plates for bridges: Install fiber plates and pressure strips on the underside of the beams using a suspended construction platform, and fix the fiber plates with temporary stabilizing devices. Step 5: Tensioning of carbon fiber plates: The prestressed carbon fiber plates are tensioned using jacks; Step Six: Thermal Insulation and Curing Construction: The prestressed carbon fiber plate structure is thermally insulated and cured using a low-temperature curing system.

[0007] Furthermore, in step two, the lower part of the suspended construction platform is equipped with a lower support beam, the upper part of the lower support beam is equipped with a steel plate platform, and the middle part of the suspended construction platform is equipped with a guardrail and an external column.

[0008] Furthermore, in step three, a powerful blower is used to thoroughly remove surface dust from the lower part of the beam and slab and keep it dry. For deeper depressions on the surface, leveling adhesive is applied to the carbon fiber plate bonding path to achieve a leveling effect.

[0009] Furthermore, in step four, the upper part of the temporary fiberboard stabilization device is fixed to the upper part of the outer beam through an external support frame and anchoring steel bars. A bottom crossbeam is set at the lower part of the temporary fiberboard stabilization device. The height of the bottom crossbeam is adjusted by a height adjustment rod. A rubber pad is set on the upper part of the height adjustment rod. A supporting rubber plate is set on the bottom crossbeam to support the fiberboard and pressure strip.

[0010] Furthermore, the low-temperature curing system is fixed to the upper part of the beam slab on both sides by anchoring steel plates, post-installed steel bars and steel wire ropes. A horizontal support rod is set at the lower part of the low-temperature curing system. A temperature sensor and an electrically controlled heating plate are set on the upper part of the horizontal support rod. The middle part of the horizontal support rod is fixed to the bottom of the beam slab by a temporary anchoring device.

[0011] Furthermore, the temporary anchoring device is equipped with adjusting blocks and support blocks at the beam-slab joint. The temporary anchoring device is fixed to the lower part of the beam-slab by adjusting the position of the adjusting screw through the adjustable handle.

[0012] The prestressed carbon fiber reinforced hollow slab is constructed using the aforementioned construction method for prestressed carbon fiber reinforced hollow slab structures.

[0013] Compared with the prior art, this application has the following beneficial effects: 1. This application uses a suspended construction platform to provide a hollow slab reinforcement work platform, which improves the safety of construction operations. At the same time, a temporary fiberboard stabilization device is used to fix the fiberboard, which improves the installation and positioning accuracy of the fiberboard. Furthermore, a low-temperature curing system is used to insulate and cure the prestressed carbon fiber slab structure, thereby improving the overall construction quality of bridge reinforcement. 2. The construction method described in this application can improve the load-bearing capacity and stability of bridges; enhance the seismic and wind resistance of bridges; extend the service life of bridges; improve the operational safety of bridges; and reduce the frequency and cost of bridge maintenance and repair. Attached Figure Description

[0014] Figure 1 This is a structural diagram of a hollow slab reinforced with prestressed carbon fiber plate; Figure 2 This is a diagram of a hollow core slab reinforcement structure; Figure 3 This is a structural diagram of a temporary fiberboard stabilization device; Figure 4 This is a structural diagram of a low-temperature curing system; Figure 5 This is a structural diagram of a temporary anchoring device; Figure 6 This is a flowchart of the construction method of this application.

[0015] In the diagram, 1. Beam / slab; 2. Top crossbeam; 3. Fixing bolt; 4. Washer; 5. Fixing channel steel; 6. Fiberboard; 7. Pressure strip; 8. Steel plate platform; 9. Suspended construction platform; 10. Lower supporting crossbeam; 11. External column; 12. Guard rod; 13. Support hanger; 14. Support rubber plate; 15. Fiberboard temporary stabilizing device; 16. Bottom crossbeam; 17. Height adjustment rod; 18. Rubber pad; 19. External support frame; 20. Reinforcing steel plate; 21. Shear stud; 22. Tie bar; 23. Anchor bar; 24. Temporary anchoring device; 25. Horizontal support rod; 26. Electrically controlled heating plate; 27. Temperature sensor; 28. Low-temperature curing system; 29. ​​Steel wire rope; 30. Anchor steel plate; 31. Post-installed rebar; 32. Joint; 33. Adjusting block; 34. Adjusting screw; 35. Adjustable handle; 36. Support block. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0018] Example 1 like Figure 1-6 As shown, the construction method for reinforcing hollow slabs with prestressed carbon fiber plates includes the following steps: Step 1: Demolition of the bridge superstructure: Demolish the upper structural layer of the bridge beam slab 1; this provides space and conditions for subsequent reinforcement work.

[0019] Step 2, Installation of the suspended construction platform 9: Install the suspended construction platform 9 under the beam 1, and install the top crossbeam 2, fixed channel steel 5 and support rod 13 on the upper part of the beam 1 to support the suspended construction platform 9. The upper part of the support rod 13 is fixed by the shims 4 and fixing bolts 3; to provide a stable working platform for construction personnel and ensure the safety and stability of the working platform.

[0020] The suspended construction platform 9 has a lower support beam 10 at the bottom, a steel plate platform 8 on the upper part of the lower support beam 10, and a guardrail 12 and an outer column 11 in the middle.

[0021] Step 3, Bridge Surface Treatment: The lower surface of beam 1 is ground, and a powerful blower is used to thoroughly remove surface dust and keep it dry. For deeper depressions on the surface, leveling adhesive is applied to the bonding path of carbon fiber plate 6 to achieve a leveling effect. Reinforcing steel plates 20 and tie bars 22 are installed between adjacent beams 1 for reinforcement, and shear studs 21 are installed on the upper part of beam 1 to enhance the shear bearing capacity of beam 1.

[0022] Step 4: Installation of prestressed carbon fiber plate 6 for bridge: Install fiber plate 6 and pressure strip 7 on the lower part of beam 1 using a suspended construction platform 9, and fix fiber plate 6 with temporary fiber plate stabilizing device 15; prepare for subsequent tensioning work.

[0023] In this embodiment, the upper part of the temporary fiberboard stabilizing device 15 is fixed to the upper part of the outer beam 1 by the external support frame 19 and the anchoring steel bar 23. The lower part of the temporary fiberboard stabilizing device 15 is provided with a bottom crossbeam 16. The height of the bottom crossbeam 16 is adjusted by the height adjustment rod 17. The upper part of the height adjustment rod 17 is provided with a rubber pad 18. The bottom crossbeam 16 is provided with a supporting rubber plate 14 to support the fiberboard 6 and the pressure strip 7.

[0024] Step 5: Tensioning of carbon fiber plate 6: The prestressed carbon fiber plate 6 is tensioned using jacks; this generates prestress in the prestressed carbon fiber plate 6, increasing the load-bearing capacity and stability of the beam slab 1.

[0025] Step Six: Thermal Insulation and Curing Construction: The prestressed carbon fiber plate structure is thermally cured using a low-temperature curing system 28. This promotes the curing of the carbon fiber plate and ensures the reinforcement effect.

[0026] In this embodiment, the low-temperature curing system 28 is fixed to the upper part of the beam 1 on both sides by anchoring steel plates 30, post-installed steel bars 31 and steel wire ropes 29. A horizontal support rod 25 is set at the lower part of the low-temperature curing system 28. A temperature sensor 27 and an electrically controlled heating plate 26 are set at the upper part of the horizontal support rod 25. The middle part of the horizontal support rod 25 is fixed to the bottom of the beam 1 by a temporary anchoring device 24.

[0027] The temporary anchoring device 24 is equipped with an adjusting block 33 and a support block 36 at the joint 32 of the beam 1. The temporary anchoring device 24 is fixed to the lower part of the beam 1 by adjusting the position of the adjusting screw 34 through the adjustable handle 35.

[0028] Example 2 The hollow slab reinforced with prestressed carbon fiber plate was constructed using the construction method for the hollow slab reinforced with prestressed carbon fiber plate in Example 1.

[0029] The parts not described in detail in this application are prior art, and therefore are not described in detail in this application.

[0030] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0031] Although this document uses a significant amount of technical terminology, the possibility of using other terms is not excluded. These terms are used merely to facilitate the description and explanation of the nature of this application; interpreting them as any additional limitation would be contrary to the spirit of this application.

[0032] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any product with the same or similar technical solution as this application falls within the protection scope of this application.

Claims

1. A construction method for reinforcing hollow slabs with prestressed carbon fiber plates, characterized in that, Includes the following steps: Step 1: Demolition of the bridge superstructure: Demolition of the bridge beams and slabs (1) superstructure layer; Step 2, Installation of the suspended construction platform (9): Install the suspended construction platform (9) under the beam (1), and install the top crossbeam (2), fixed channel steel (5) and support rod (13) on the upper part of the beam (1) to support the suspended construction platform (9). The upper part of the support rod (13) is fixed by the gasket (4) and the fixing bolt (3). The lower part of the suspended construction platform (9) is provided with a lower support crossbeam (10), and the upper part of the lower support crossbeam (10) is provided with a steel plate platform (8). The middle part of the suspended construction platform (9) is provided with a guard rod (12) and an outer column (11). Step 3, Bridge surface treatment: Grind the lower surface of the beam (1), reinforce the adjacent beams (1) with steel plates (20) and tie bars (22), and set shear studs (21) on the upper part of the beam (1). Step 4, Installation of prestressed carbon fiber plates for bridges: Carbon fiber plates (6) and pressure strips (7) are installed on the lower part of the beam (1) using a suspended construction platform (9). The carbon fiber plates (6) are fixed using a temporary fiberboard stabilizing device (15). The upper part of the temporary fiberboard stabilizing device (15) is fixed to the upper part of the outer beam (1) through an external support frame (19) and anchoring steel bars (23). A bottom crossbeam (16) is set at the lower part of the temporary fiberboard stabilizing device (15). The height of the bottom crossbeam (16) is adjusted by a height adjustment rod (17). A rubber pad (18) is set on the upper part of the height adjustment rod (17). A supporting rubber plate (14) is set on the bottom crossbeam (16) to support the carbon fiber plates (6) and pressure strips (7). Step 5, tensioning of carbon fiber plate (6): The carbon fiber plate (6) is tensioned using jacks; Step 6, Thermal Insulation and Curing Construction: The carbon fiber plate (6) structure is thermally insulated and cured using a low-temperature curing system (28); the low-temperature curing system (28) is fixed to the upper part of the beam (1) on both sides by anchoring steel plates (30), post-installed steel bars (31) and steel wire ropes (29); a horizontal support rod (25) is set at the lower part of the low-temperature curing system (28); a temperature sensor (27) and an electrically controlled heating plate (26) are set at the upper part of the horizontal support rod (25); and the middle part of the horizontal support rod (25) is fixed to the bottom of the beam (1) by a temporary anchoring device (24).

2. The construction method for reinforcing hollow slabs with prestressed carbon fiber plates according to claim 1, characterized in that, In step three, a powerful blower is used to thoroughly remove surface dust from the lower surface of the beam (1) and keep it dry. For deeper depressions on the surface, leveling adhesive is applied to the bonding path of the carbon fiber plate (6) to achieve a leveling effect.

3. The construction method for reinforcing hollow slabs with prestressed carbon fiber plates according to claim 1, characterized in that, The temporary anchoring device (24) is provided with an adjustment block (33) and a support block (36) at the joint (32) of the beam (1). The temporary anchoring device (24) is fixed to the lower part of the beam (1) by adjusting the position of the adjusting screw (34) through the adjustable handle (35).

4. A hollow slab reinforced with prestressed carbon fiber plate, characterized in that, The prestressed carbon fiber plate reinforced hollow slab is prepared by the construction method of any one of claims 1-3.

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