Bridge splicing structure
By using sacrificial anode technology to form corrosive electrical circuits in bridge splicing structure, the problem of high cost and poor effect of steel bar rust prevention in bridge transformation is solved, and economical and practical anti-rust effect is achieved, extending the life of steel bars and improving the bridge. performance.
Patent Information
- Application Number
- CN202420751120.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-09
AI Technical Summary
During the bridge renovation process, the anti-rust treatment method of existing reinforced concrete bridges is costly and is prone to uneven painting or skin damage, resulting in a reduced service life of the steel bars and affecting the overall performance of the bridge.
The sacrificial anode technology is used to form a corrosive electric circuit at the connection between the old and new steel bars, and the potential difference is used to corrode the sacrificial anode, thereby protecting the steel bars and preventing rust. The technology includes setting conductive wires and corrosive parts at the connection between old and new steel bars, forming a circuit, and closing it through concrete pouring.
It reduces manufacturing costs, improves the service life of steel bars and the overall performance of bridges, is simple to operate, has a high protection current utilization rate, and avoids overprotection.
Smart Images
Figure CN222160975U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge reconstruction, in particular to a bridge splicing structure. Background Art
[0002] As the main structure of bridge construction, reinforced concrete has good durability and has been tested and recognized in actual use. Therefore, reinforced concrete bridges have become the most widely used bridges in the world. During the bridge reconstruction process, the splicing project of the new and old bridges needs to pay attention to the rust problem of the adjacent new and old steel bars. At present, the surface of the old steel bars is usually coated with sealing paint for rust prevention.
[0003] However, this method of applying sealing paint has a high manufacturing cost and is prone to uneven application or surface damage due to touch, which can cause more serious pitting corrosion, reduce the service life of the steel bars, and affect the overall performance of the bridge. Utility Model Content
[0004] The utility model aims to provide a bridge splicing structure which is economical and practical, has reliable performance, can reduce manufacturing costs, and improve the service life of steel bars and the overall performance of the bridge.
[0005] The embodiment of the utility model is achieved as follows:
[0006] In a first aspect, the utility model provides a bridge splicing structure, comprising:
[0007] An old bridge body, wherein the old bridge body is provided with old steel bars;
[0008] A new bridge body, the new bridge body is located on one side of the old bridge body, and the new bridge body is provided with new steel bars, and the new steel bars are connected to the old steel bars; and
[0009] A sacrificial anode, wherein both ends of the sacrificial anode are respectively connected to the connection between the new steel bar and the old steel bar, so that a corrosion electrical circuit is formed among the sacrificial anode, the new steel bar and the old steel bar.
[0010] In an optional embodiment, the sacrificial anode includes a conductive wire and a corrosion part arranged on the conductive wire, and the two ends of the conductive wire are respectively connected to the connection between the new steel bar and the old steel bar, so that the corrosion electrical circuit is formed between the conductive wire, the corrosion part, the new steel bar and the old steel bar.
[0011] In an optional embodiment, the material of the corrosion part is a zinc-based alloy.
[0012] In an optional embodiment, there are multiple sacrificial anodes, and the multiple sacrificial anodes are arranged at intervals along the connection direction between the new steel bars and the old steel bars.
[0013] In an optional embodiment, a plurality of the sacrificial anodes are evenly spaced apart.
[0014] In an optional embodiment, the number of the old steel bars and the number of the new steel bars are both multiple, the multiple old steel bars correspond to and are connected to the multiple new steel bars in a one-to-one manner along the first direction, and the sacrificial anode is provided at the connection between each new steel bar and each old steel bar; the multiple old steel bars and the multiple new steel bars are arranged at intervals along the second direction;
[0015] The first direction and the second direction form an angle.
[0016] In an optional embodiment, the plurality of old steel bars are evenly spaced and arranged, and the plurality of new steel bars are evenly spaced and arranged.
[0017] In an optional embodiment, the old bridge body is provided with a first excavated groove, and the old steel bars are arranged in the first excavated groove; the new bridge body is provided with a second excavated groove, and the new steel bars are arranged in the second excavated groove.
[0018] In an optional embodiment, the old bridge body is also provided with a first cast-in-place layer, which is laid in the first excavated groove and covers the old steel bars; the new bridge body is also provided with a second cast-in-place layer, which is laid in the second excavated groove and covers the new steel bars; the second cast-in-place layer is connected to the second cast-in-place layer.
[0019] In an optional embodiment, the old bridge body is further provided with old stirrups, and the old stirrups are located below the old steel bars; the new bridge body is further provided with new stirrups, and the new stirrups are located below the new steel bars;
[0020] The old stirrups are connected to the new stirrups, and the sacrificial anode is arranged at the connection between the old stirrups and the new stirrups, and the corrosion electrical circuit is formed between the sacrificial anode, the old stirrups and the new stirrups.
[0021] The beneficial effects of the embodiments of the utility model include:
[0022] The bridge splicing structure includes an old bridge body, a new bridge body and a sacrificial anode. The old bridge body is provided with old steel bars. The new bridge body is located on one side of the old bridge body, and the new bridge body is provided with new steel bars, which are connected to the old steel bars. The two ends of the sacrificial anode are respectively connected to the connection between the new steel bars and the old steel bars, so that a corrosion circuit is formed between the sacrificial anode, the new steel bars and the old steel bars. Since the potential of the sacrificial anode is lower than that of the new steel bars and the old steel bars, in the corrosion circuit, the new steel bars and the old steel bars serve as cathodes in the circuit, while the sacrificial anode serves as an anode in the circuit. In this way, the potential difference formed between the anode and the cathode will cause the current to flow from the sacrificial anode to the steel bars through the electrolyte. In other words, the sacrificial anode is continuously corroded and consumed with the outflowing current, so that the steel bars are protected by cathode polarization, thereby achieving the effect of preventing steel bars from rusting. This method of setting sacrificial anodes is simple to operate, has a low one-time investment cost, can reduce manufacturing costs, and is economical and practical. In addition, the utilization rate of the protection current is high, over-protection will not occur, the service life is long, and the overall performance of the bridge can be improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 A schematic diagram of the structure of a bridge splicing structure provided by an embodiment of the utility model;
[0025] Figure 2 A schematic diagram of the connection between the sacrificial anode and the new and old steel bars provided in the embodiment of the utility model;
[0026] Figure 3 A schematic diagram of the arrangement of new and old steel bars provided in an embodiment of the utility model.
[0027] Icons: 100-bridge splicing structure; 10-old bridge body; 11-old steel bars; 12-first excavated groove; 13-first cast-in-place layer; 14-old stirrups; 15-third excavated groove; 16-third cast-in-place layer; 20-new bridge body; 21-new steel bars; 22-second excavated groove; 23-second cast-in-place layer; 24-new stirrups; 25-fourth excavated groove; 26-fourth cast-in-place layer; 30-sacrificial anode; 31-conductive wire; 32-corroded parts. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] As described in the background technology, during the bridge reconstruction process, the new and old bridge splicing project needs to pay attention to the rust problem of the adjacent new and old steel bars. At present, the method of applying sealing paint on the surface of the old steel bars is usually used for rust prevention. However, this method of applying sealing paint has a high manufacturing cost and is prone to uneven application or surface damage, which causes more serious pitting corrosion, resulting in a reduction in the service life of the steel bars and affecting the overall performance of the bridge.
[0035] Based on this, please refer to Figure 1-Figure 3 The embodiment of the utility model provides a bridge splicing structure 100, which can effectively improve the above-mentioned technical problems, that is, it is economical and practical, has reliable performance, can reduce manufacturing costs, and improve the service life of steel bars and the overall performance of the bridge.
[0036] It should be noted that in the following content, the first direction mentioned is Figure 1-Figure 3 The X direction is shown in the figure, and the second direction is Figure 1-Figure 3 The Y direction is shown in the figure, and the third direction is Figure 1-Figure 3 The bridge splicing structure 100 will be described in detail below.
[0037] Please refer to Figure 1 , Figure 1 The structural diagram of the bridge splicing structure 100 provided in this embodiment is combined with Figure 1 The bridge splicing structure 100 includes an old bridge body 10, a new bridge body 20 and a sacrificial anode 30. The old bridge body 10 is provided with old steel bars 11. The new bridge body 20 is located on one side of the old bridge body 10, and the new bridge body 20 is provided with new steel bars 21, which are connected to the old steel bars 11. The two ends of the sacrificial anode 30 are respectively connected to the connection between the new steel bars 21 and the old steel bars 11, so that a corrosion electrical circuit is formed between the sacrificial anode 30, the new steel bars 21 and the old steel bars 11.
[0038] Since the potential of the sacrificial anode 30 is lower than that of the new steel bar 21 and the old steel bar 11, in the corrosion circuit, the new steel bar 21 and the old steel bar 11 serve as cathodes in the circuit, while the sacrificial anode 30 serves as anode in the circuit; thus, the potential difference formed between the anode and the cathode causes the current to flow from the sacrificial anode 30 to the steel bar through the electrolyte; that is, the sacrificial anode 30 is continuously corroded and consumed with the outflowing current, so that the steel bar is protected by cathode polarization, thereby achieving the effect of preventing the steel bar from rusting. This method of setting the sacrificial anode 30 is simple to operate, has a low one-time investment cost, can reduce manufacturing costs, and is economical and practical; and the utilization rate of the protection current is high, no over-protection will occur, and the service life is long, which can improve the overall performance of the bridge.
[0039] Specifically, please refer to Figure 2, Figure 2 The schematic diagram of the connection between the sacrificial anode 30 provided in this embodiment and the new steel bar 21 and the old steel bar 11 is shown in FIG. Figure 2 The sacrificial anode 30 includes a conductive wire 31 and a corrosion member 32 arranged on the conductive wire 31. The two ends of the conductive wire 31 are respectively connected to the connection between the new steel bar 21 and the old steel bar 11, so that a corrosion electrical circuit is formed between the conductive wire 31, the corrosion member 32, the new steel bar 21 and the old steel bar 11.
[0040] It should be noted that, in this embodiment, the material of the corrosion part 32 is a zinc-based alloy, which has a low potential, good molding properties, a low melting point, good fluidity, does not absorb iron during melting and die-casting, does not corrode the die, and does not stick to the mold, and can better meet the design requirements and load-bearing performance of the bridge. Of course, in other embodiments, the material of the corrosion part 32 can also be other metal materials such as magnesium alloy or aluminum alloy, as long as it can meet the low potential requirements and be corroded as an anode in the formed current loop.
[0041] In addition, it should be noted that when the conductive wire 31 is tied to the new steel bar 21 and the old steel bar 11, the wires at both ends need to be wrapped around the steel bar at least once, that is, the new steel bar 21 and the old steel bar 11 are tied together by the conductive wire 31 to ensure a stable connection.
[0042] Please continue to combine Figure 1 In order to improve the anti-rust effect of the steel bar, the number of the sacrificial anodes 30 can be set to multiple, and the multiple sacrificial anodes 30 are arranged at intervals along the connection direction of the new steel bar 21 and the old steel bar 11, that is, along Figure 1 In the present embodiment, two sacrificial anodes 30 are arranged at intervals at the connection between the new steel bar 21 and the old steel bar 11. Of course, in other embodiments, three, four, etc. may be arranged. The specific number needs to be determined according to the actual bridge splicing design requirements.
[0043] In order to further improve the anti-rust effect at the connection between the new steel bar 21 and the old steel bar 11, multiple sacrificial anodes 30 can also be evenly spaced, that is, the distance between any two adjacent sacrificial anodes 30 is equal, so that the anti-rust protection effect of each connection section can be ensured to be the same.
[0044] Please refer to Figure 3 , Figure 3 The schematic diagram of the arrangement of the new steel bars 21 and the old steel bars 11 provided in this embodiment, combined with Figure 1 and Figure 3In this embodiment, the number of old steel bars 11 and the number of new steel bars 21 are both multiple, and the multiple old steel bars 11 correspond to and are connected to the multiple new steel bars 21 one by one along the first direction, and a sacrificial anode 30 is provided at the connection between each new steel bar 21 and each old steel bar 11; the multiple old steel bars 11 and the multiple new steel bars 21 are spaced apart along the second direction; wherein the first direction forms an angle with the second direction.
[0045] That is to say, by connecting multiple new steel bars 21 with multiple old steel bars 11 in a one-to-one correspondence, the strength and stability of the bridge splicing can be improved. At the same time, a sacrificial anode 30 is provided at the connection between each new steel bar 21 and each old steel bar 11, which can also ensure that all new and old steel bars 11 will not be corroded, so as to achieve the purpose of rust prevention.
[0046] Similarly, in order to further improve the strength and stability of bridge splicing, such as Figure 3 As shown, a plurality of old steel bars 11 are evenly spaced and a plurality of new steel bars 21 are evenly spaced and arranged.
[0047] Please continue to combine Figure 1 In the process of splicing the new and old bridges, since the steel bars are generally pre-buried inside the bridge body, in order to facilitate the overlap of the new and old steel bars 11, in this embodiment, the old bridge body 10 is provided with a first excavated groove 12, and the old steel bars 11 are arranged in the first excavated groove 12; the new bridge body 20 is provided with a second excavated groove 22, and the new steel bars 21 are arranged in the second excavated groove 22. In other words, the parts of the new and old bridges to be overlapped are first determined, and then the first excavated groove 12 and the second excavated groove 22 are excavated respectively, and then the new steel bars 21 are arranged in the second excavated groove 22, and finally the old steel bars 11 in the first excavated groove 12 are connected with the new steel bars 21 in the second excavated groove 22.
[0048] Furthermore, the old bridge body 10 is also provided with a first cast-in-place layer 13, which is laid in the first excavated groove 12 and covers the old steel bars 11; the new bridge body 20 is also provided with a second cast-in-place layer 23, which is laid in the second excavated groove 22 and covers the new steel bars 21; the second cast-in-place layer 23 is connected to the second cast-in-place layer 23. That is, after the new and old steel bars 11 are connected and the sacrificial anode 30 is set at the connection between the new and old steel bars 11, it is necessary to pour concrete or other materials to form the first cast-in-place layer 13 and the second cast-in-place layer 23, so as to close the first excavated groove 12 and the second excavated groove 22.
[0049] In the design process of bridges, stirrups are usually set to meet the shear strength of the inclined section. Therefore, in order to achieve rust protection for the stirrups, combined with Figure 1The old bridge body 10 is also provided with old stirrups 14, and the old stirrups 14 are located below the old steel bars 11; the new bridge body 20 is also provided with new stirrups 24, and the new stirrups 24 are located below the new steel bars 21; the old stirrups 14 are connected to the new stirrups 24, and a sacrificial anode 30 is provided at the connection between the old stirrups 14 and the new stirrups 24, and a corrosion electrical circuit is formed between the sacrificial anode 30, the old stirrups 14 and the new stirrups 24.
[0050] It should be noted that if Figure 1 As shown, the old stirrups 14 and the old steel bars 11 are spaced apart along the third direction, and the new stirrups 24 and the new steel bars 21 are spaced apart along the third direction. Figure 1 and Figure 3 , the first direction, the second direction and the third direction are perpendicular to each other.
[0051] Similarly, in order to facilitate the overlapping of the new and old stirrups 14, in this embodiment, the old bridge body 10 is also provided with a third excavated groove 15, and the old stirrups 14 are arranged in the third excavated groove 15; the new bridge body 20 is also provided with a fourth excavated groove 25, and the new stirrups 24 are arranged in the fourth excavated groove 25.
[0052] At the same time, in order to close the third excavated groove 15 and the fourth excavated groove 25, the old bridge body 10 is also provided with a third cast-in-place layer 16, which is laid on the third excavated groove 15 and covers the old stirrups 14; the new bridge body 20 is also provided with a fourth cast-in-place layer 26, which is laid on the fourth excavated groove 25 and covers the new stirrups 24; the third cast-in-place layer 16 is connected to the fourth cast-in-place layer 26.
[0053] Through the above description, this embodiment also provides a construction method of a bridge splicing structure 100, which specifically includes:
[0054] Step S10: using a steel bar positioning instrument to locate the old steel bars 11 of the old bridge body 10, outlining the rough outline of the old steel bars 11, and defining the location where the sacrificial anode 30 needs to be buried;
[0055] Step S20: using a bridge deck excavation device to excavate a first excavation groove 12 in the old bridge body 10 until the complete old steel bars 11 are exposed, and then the surface rust of the old steel bars 11 is cleaned;
[0056] Step S30: transport the new bridge body 20 to the designated position of the old bridge body 10, and excavate a second excavation groove 22 at the corresponding position of the new bridge body 20; after the new steel bars 21 are centrally processed in the steel bar processing plant, they are transported to the construction site and tied at the second excavation groove 22;
[0057] Step S40: tie the new steel bar 21 and the old steel bar 11 together and weld them, then tie the conductive wire 31 of the sacrificial anode 30 to the connection between the new steel bar 21 and the old steel bar 11, wrap it for at least one circle and tighten it;
[0058] Step S50: using a detection device to detect the circuit between the new and old steel bars 11 and the sacrificial anode 30 to ensure that a corrosion circuit is formed;
[0059] Step S60: pouring concrete into the first excavated groove 12 and the second excavated groove 22, covering the old steel bars 11 and the new steel bars 21, forming a first cast-in-place layer 13 and a second cast-in-place layer 23, and connecting the first cast-in-place layer 13 and the second cast-in-place layer 23 into one during the pouring process.
[0060] In summary, the embodiment of the utility model provides a bridge splicing structure 100, which includes an old bridge body 10, a new bridge body 20 and a sacrificial anode 30. The old bridge body 10 is provided with an old steel bar 11, and the new bridge body 20 is located on one side of the old bridge body 10, and the new bridge body 20 is provided with a new steel bar 21, and the new steel bar 21 is connected to the old steel bar 11; the two ends of the sacrificial anode 30 are respectively connected to the connection between the new steel bar 21 and the old steel bar 11, so that a corrosion circuit is formed between the sacrificial anode 30, the new steel bar 21 and the old steel bar 11. Since the potential of the sacrificial anode 30 is lower than that of the new steel bar 21 and the old steel bar 11, in the corrosion circuit, the new steel bar 21 and the old steel bar 11 serve as cathodes in the circuit, and the sacrificial anode 30 serves as an anode in the circuit; in this way, the potential difference formed between the anode and the cathode will cause the current to flow from the sacrificial anode 30 to the steel bar through the electrolyte; that is, the sacrificial anode 30 is continuously corroded and consumed with the outflowing current, so that the steel bar obtains cathode polarization and is protected, thereby achieving the effect of preventing steel bar corrosion. This method of setting the sacrificial anode 30 is simple to operate, has a low one-time investment cost, can reduce manufacturing costs, and is economical and practical; and the utilization rate of the protection current is high, over-protection will not occur, the service life is long, and the overall performance of the bridge can be improved.
[0061] Therefore, the bridge splicing structure 100 provided by the embodiment of the utility model is economical and practical, has reliable performance, can reduce manufacturing costs, and improve the service life of steel bars and the overall performance of the bridge.
[0062] The above description is only a specific embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A bridge splicing structure, characterized in that: include: An old bridge body (10), wherein the old bridge body (10) is provided with old steel bars (11); A new bridge body (20), the new bridge body (20) being located on one side of the old bridge body (10), and the new bridge body (20) being provided with new steel bars (21), the new steel bars (21) being connected to the old steel bars (11); and A sacrificial anode (30), wherein both ends of the sacrificial anode (30) are respectively connected to the connection between the new steel bar (21) and the old steel bar (11), so that a corrosion electrical circuit is formed between the sacrificial anode (30), the new steel bar (21) and the old steel bar (11).
2. The bridge splicing structure according to claim 1, characterized in that: The sacrificial anode (30) comprises a conductive wire (31) and a corrosion component (32) arranged on the conductive wire (31), and the two ends of the conductive wire (31) are respectively connected to the connection between the new steel bar (21) and the old steel bar (11), so that the corrosion electrical circuit is formed between the conductive wire (31), the corrosion component (32), the new steel bar (21) and the old steel bar (11).
3. The bridge splicing structure according to claim 2, characterized in that: The material of the corrosion part (32) is zinc-based alloy.
4. The bridge splicing structure according to claim 1, characterized in that: The number of the sacrificial anodes (30) is plural, and the plural sacrificial anodes (30) are arranged at intervals along the connection direction between the new steel bar (21) and the old steel bar (11).
5. The bridge splicing structure according to claim 4, characterized in that: The plurality of sacrificial anodes (30) are evenly spaced apart.
6. The bridge splicing structure according to claim 1, characterized in that: The number of the old steel bars (11) and the number of the new steel bars (21) are both multiple, the multiple old steel bars (11) and the multiple new steel bars (21) correspond to each other and are connected along the first direction, and the sacrificial anode (30) is provided at the connection between each new steel bar (21) and each old steel bar (11); the multiple old steel bars (11) and the multiple new steel bars (21) are arranged at intervals along the second direction; The first direction and the second direction form an angle.
7. The bridge splicing structure according to claim 6, characterized in that: The plurality of old steel bars (11) are evenly spaced and arranged, and the plurality of new steel bars (21) are evenly spaced and arranged.
8. The bridge splicing structure according to claim 1, characterized in that: The old bridge body (10) is provided with a first excavated groove (12), and the old steel bars (11) are arranged in the first excavated groove (12); the new bridge body (20) is provided with a second excavated groove (22), and the new steel bars (21) are arranged in the second excavated groove (22).
9. The bridge splicing structure according to claim 8, characterized in that: The old bridge body (10) is also provided with a first cast-in-place layer (13), which is laid in the first excavated groove (12) and covers the old steel bars (11); the new bridge body (20) is also provided with a second cast-in-place layer (23), which is laid in the second excavated groove (22) and covers the new steel bars (21); the second cast-in-place layer (23) is connected to the second cast-in-place layer (23).
10. The bridge splicing structure according to claim 1, characterized in that: The old bridge body (10) is also provided with old stirrups (14), and the old stirrups (14) are located below the old steel bars (11); the new bridge body (20) is also provided with new stirrups (24), and the new stirrups (24) are located below the new steel bars (21); The old stirrup (14) is connected to the new stirrup (24), and the sacrificial anode (30) is provided at the connection between the old stirrup (14) and the new stirrup (24), and the corrosion electrical circuit is formed between the sacrificial anode (30), the old stirrup (14) and the new stirrup (24).