Spiral stirrup prefabricated bridge deck slab

Abstract

The utility model provides a spiral stirrup prefabricated bridge deck slab which comprises main reinforcements and spiral stirrups, the main reinforcements are arranged in two rows, a plurality of main reinforcements are arranged in each row side by side, the spiral stirrups are spirally wound on the peripheries of the two rows of main reinforcements, and the projection of the spiral stirrups on the cross section of the spiral stirrups is in a kidney-shaped hole shape or a rectangular shape. The spiral stirrups are adopted to replace traditional single-piece separated stirrups, the number of times of cutting off and bending the stirrups is reduced, the standardization degree of manufacturing of the prefabricated bridge deck slab reinforcement cage is improved, and the use amount of the stirrups is reduced; in addition, the spiral stirrups are adopted, so that the hoop replacement effect can be achieved on concrete in the core area of the bridge deck slab, and the bearing capacity and the anti-seismic property of the bridge deck slab are effectively improved.

Description

Technical Field

[0001] This application relates to the field of precast bridge decks, and more particularly to a spiral stirrup precast bridge deck. Background Technology

[0002] Traditional bridge deck reinforcement consists of main bars and stirrups, with the stirrups being single, separate stirrups tied to the main bars to form the bridge deck reinforcement. This traditional method of precast bridge deck reinforcement using single, separate stirrups provides weak confinement to the core concrete. Because the single stirrups are only connected by longitudinal reinforcement to form a steel skeleton, the overall integrity of the steel skeleton is poor. Furthermore, the traditional precast bridge deck single-piece separate stirrup manufacturing process is complex. It requires cutting the steel bars to the appropriate length, bending them into single, separate stirrups, and finally tying them to the longitudinal reinforcement to form the steel skeleton. The construction process is complex, involving a large amount of work in cutting, bending, and tying the steel bars. The tied ends also require additional hooks and laps, increasing the cost of steel. Utility Model Content

[0003] The purpose of this application is to provide a precast bridge deck with spiral stirrups, which can significantly improve the structural strength and integrity of the steel reinforcement skeleton of the bridge deck, facilitate construction, and greatly improve the load-bearing capacity and seismic performance of the precast bridge deck.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A precast bridge deck with spiral stirrups includes main bars and spiral stirrups. The main bars are arranged in two rows, with multiple bars arranged side by side in each row. The spiral stirrups are spirally wound around the outer periphery of the two rows of main bars. The projection of the spiral stirrups in their cross-section is waist-shaped or rectangular.

[0006] Further configuration: The spiral stirrup is made of a single steel bar, which is wound around the outer periphery of the two rows of main bars and along the length of the main bars to form a spiral structure.

[0007] Further configuration: The spiral stirrup includes multiple steel bars, and a connecting sleeve is provided between the adjacent ends of two consecutive steel bars to connect the multiple steel bars to form a single steel bar.

[0008] Further configuration: The pitch of the spiral stirrup is between 40mm and 80mm.

[0009] Further configuration: The spiral stirrups are made of steel bars with a diameter greater than 12mm.

[0010] Further configuration: The number of main reinforcement bars in both rows is the same and they are configured in a one-to-one correspondence.

[0011] Further configuration: The spacing between two adjacent main bars in each row is between 20cm and 35cm.

[0012] Further details: The main reinforcing bars are made of precision-rolled threaded steel.

[0013] Further configuration: Adjacent precast bridge deck panels with spiral stirrups are connected by main reinforcing bars to form a butt joint.

[0014] Compared with existing technologies, the solution in this application has the following advantages:

[0015] 1. In the precast bridge deck with spiral stirrups involved in this application, a single steel bar is used to form a spiral stirrup of the design size of the precast bridge deck by being pulled by a winding machine and a mold of the corresponding shape of the precast bridge deck. The spiral stirrup is then tied to the main longitudinal reinforcement of the bridge deck to form the steel skeleton of the precast bridge deck. The steel skeleton has good structural integrity. The use of spiral stirrups can play a stirrup replacement effect on the concrete in the core area of ​​the bridge deck, effectively improving the load-bearing capacity and seismic performance of the bridge deck.

[0016] 2. The spiral stirrup precast bridge deck involved in this application uses spiral stirrups instead of traditional single-piece separate stirrups, which reduces the number of times the stirrup reinforcement is cut and bent, improves the standardization of the precast bridge deck reinforcement skeleton, reduces the amount of stirrup reinforcement, and when tied with the main reinforcement, the spiral stirrups can automatically support the skeleton, which is convenient for positioning. Moreover, there are no hooks and overlaps with many open hooks, so the tying speed can be accelerated, the tying efficiency can be improved, and the operation time can be shortened.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a structural schematic diagram of one embodiment of the spiral stirrup precast bridge deck of this application;

[0020] Figure 2 This is a front view of one embodiment of the spiral stirrup precast bridge deck of this application;

[0021] Figure 3 This is a cross-sectional schematic diagram of one embodiment of the spiral stirrup precast bridge deck of this application.

[0022] In the diagram, 1 is a spiral stirrup; 2 is a main reinforcement bar. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0025] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "connection" can refer to a direct connection or an indirect connection via intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description.

[0026] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish between devices, modules or units, and are not intended to limit these devices, modules or units to necessarily be different devices, modules or units, nor are they intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0027] To address the issues of poor integrity and complex fabrication in the steel reinforcement framework of traditional precast bridge decks, please combine... Figures 1 to 3 This application provides a precast bridge deck with spiral stirrups, which includes main reinforcement 2 and spiral stirrups 1. By binding the continuous spiral stirrups 1 with the main reinforcement 2 to form an integral steel reinforcement skeleton, the structural integrity of the steel reinforcement skeleton of the precast bridge deck can be effectively enhanced, and the number of times the stirrups are cut off and bent can be reduced, thereby improving construction efficiency.

[0028] Specifically, in this embodiment, the main reinforcement 2 is arranged in two rows, with multiple main reinforcement 2 arranged side by side in each row. The spiral stirrup 1 is spirally wound around the outer periphery of the two rows of main reinforcement 2. The spiral stirrup 1 and the main reinforcement 2 are tied together by a single loop so that the spiral stirrup 1 and the main reinforcement 2 are connected to form the steel reinforcement skeleton of the bridge deck.

[0029] Furthermore, in this embodiment, the spiral stirrup 1 is made by wrapping a single steel bar around the outer periphery of two rows of main reinforcement bars 2 and along the length of the main reinforcement bars 2. This makes the spiral stirrup 1 structurally robust, effectively enhancing the structural integrity of the steel reinforcement skeleton of the precast bridge deck and improving the hoop effect of the stirrup on the core area of ​​the precast bridge deck concrete. The spiral rib design of the spiral stirrup 1 can effectively increase the bond between the steel bar and the concrete, effectively improving the seismic performance of the concrete structure and making the bridge deck more stable under dynamic loads such as earthquakes. At the same time, it can also effectively prevent the expansion of concrete cracks, ensuring the integrity and stability of the bridge deck structure, thereby improving its crack resistance and ensuring the structural strength of the precast bridge deck.

[0030] In other embodiments, the spiral stirrup 1 includes multiple reinforcing bars, which can be connected by connecting sleeves or welding to form a single reinforcing bar. That is, a single reinforcing bar can be divided into multiple reinforcing bar segments for convenient transportation.

[0031] This application, by using a single steel bar wound into a spiral stirrup 1, can reduce the number of cuts and bends of the stirrup steel bar, improve the standardization of the precast bridge deck steel reinforcement skeleton fabrication, reduce the amount of stirrup steel bar used, and when tied with the main reinforcement 2, the spiral stirrup can automatically support the skeleton, facilitating positioning, and without numerous open hooks and overlaps, thus speeding up the tying process, improving tying efficiency, and shortening operation time. In this embodiment, when tying the spiral stirrup 1 to the main reinforcement 2, a wrapping or looping method is typically used to tightly bind the spiral stirrup 1 and the main reinforcement 2 together. During tying, it is also necessary to ensure that all intersections of the spiral stirrup 1 and the main reinforcement 2 are securely tied to prevent loosening or detachment.

[0032] In this embodiment, the pitch of the spiral stirrup 1 is between 40mm and 80mm. Spiral stirrups 1 within this pitch range provide good confinement to the concrete, improving the structure's load-bearing capacity and seismic performance. Furthermore, in this embodiment, the spiral stirrup 1 preferably uses steel bars with a diameter greater than 10mm to ensure its structural strength.

[0033] In addition, the two rows of main reinforcement bars 2 are of the same number and are set one-to-one. The two rows of main reinforcement bars 2 are respectively connected to the opposite sides of the spiral stirrups 1. The spacing between two adjacent main reinforcement bars 2 in each row is between 20cm and 35cm to ensure the strength of the steel reinforcement skeleton of the bridge deck.

[0034] In this embodiment, the main reinforcement 2 is preferably made of high-strength threaded steel, which can significantly improve the load-bearing capacity and seismic performance of the bridge deck. Simultaneously, the use of high-strength threaded steel for the main reinforcement 2 facilitates its transportation by dividing it into multiple segments, and also allows for easy connection between adjacent bridge deck panels via the main reinforcement 2. In practice, the connection of the main reinforcement 2 between adjacent bridge deck panels is typically achieved through welding, mechanical connection, or binding connection.

[0035] After the steel reinforcement cage for the precast bridge deck is tied, concrete can be poured to form the bridge deck. During pouring, attention must be paid to the stability and positional accuracy of the steel reinforcement cage. Simultaneously, a vibrator can be used to compact the concrete using a flat dragging method, and a vibratory beam can be used to level the surface, ensuring a tight bond between the concrete and the steel reinforcement cage. Furthermore, the elevation needs to be controlled by adjusting the roller height of the leveling machine to ensure the flatness of the bridge deck meets design requirements. After pouring, a polishing machine can be used to initially smooth the formed bridge deck, quickly raising the surface, followed by localized trimming. Then, a brushing machine is used to roughen the surface, ensuring straight lines and consistent depth. Finally, the concrete is cured by covering it with a film and geotextile and sprinkling water to ensure the strength and durability of the bridge deck concrete.

[0036] In summary, the spiral stirrup precast bridge deck of this application uses a single steel bar to be wound by a winding machine and a mold corresponding to the shape of the precast bridge deck to form a spiral stirrup 1 of the design size of the precast bridge deck. The wound spiral stirrup 1 is then tied to the main longitudinal reinforcing bars 2 of the bridge deck to form the steel reinforcement skeleton of the precast bridge deck. This steel reinforcement skeleton has good structural integrity. The use of spiral stirrup 1 can play a hoop effect on the concrete in the core area of ​​the bridge deck, effectively improving the load-bearing capacity and seismic performance of the bridge deck.

[0037] This application uses spiral stirrups 1 instead of traditional single-piece separated stirrups, which reduces the number of steel bar cuts and bends, improves the standardization of precast bridge deck steel reinforcement skeleton fabrication, and also reduces the amount of stirrups used, thereby reducing construction costs.

[0038] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A precast bridge deck with spiral stirrups, characterized in that, It includes main bars and spiral stirrups. The main bars are arranged in two rows, with multiple bars arranged side by side in each row. The spiral stirrups are spirally wound around the outer periphery of the two rows of main bars. The projection of the spiral stirrups in their cross-section is waist-shaped or rectangular.

2. The precast bridge deck with spiral stirrups according to claim 1, characterized in that, The spiral stirrup is made of a single steel bar, which is wound around the outer periphery of the two rows of main bars and along the length of the main bars to form a spiral structure.

3. The precast bridge deck with spiral stirrups according to claim 1, characterized in that, The spiral stirrup includes multiple steel bars, and a connecting sleeve is provided between the adjacent ends of two consecutive steel bars to connect the multiple steel bars to form a single steel bar.

4. The precast bridge deck with spiral stirrups according to claim 1, characterized in that, The pitch of the spiral stirrups ranges from 40mm to 80mm.

5. The precast bridge deck with spiral stirrups according to claim 1, characterized in that, The spiral stirrups are made of steel bars with a diameter greater than 12mm.

6. The precast bridge deck with spiral stirrups according to claim 1, characterized in that, The number of main reinforcement bars in both rows is the same and they are set in a one-to-one correspondence.

7. The precast bridge deck with spiral stirrups according to claim 1 or 4, characterized in that, The spacing between two adjacent main bars in each row is between 20cm and 35cm.

8. The precast bridge deck with spiral stirrups according to claim 1, characterized in that, The main reinforcing bars are made of precision-rolled threaded steel.

9. The precast bridge deck with spiral stirrups according to claim 1, characterized in that, The adjacent precast bridge deck panels with spiral stirrups are connected by main reinforcing bars.

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