A dry precast concrete bridge deck steel-concrete connection structure and its manufacturing method

Abstract

The present invention discloses a dry precast concrete bridge deck steel-concrete connection structure and its manufacturing method, belonging to the technical field of engineering construction. It includes two precast concrete bridge decks to be connected, and there are steel-concrete connectors that are symmetrically connected in pairs on the left and right between the two bridge decks. The upper part of the steel-concrete connector is provided with a U-shaped through groove with an opening facing the end of the bridge deck and matching the thickness of the bridge deck. In the U-shaped through groove, a plurality of perforated steel plates with several high-strength threaded steel bars inserted therein and multiple groups of anchoring nails that are engaged with the transverse steel bars at the end of the bridge deck in an up-and-down toothed manner are respectively arranged at intervals along the extending direction of the cavity groove. A number of longitudinal circular steel bars arranged at intervals along the length direction of the U-shaped through groove at the end of the bridge deck are inserted deeply into the U-shaped through groove and sleeved on the high-strength threaded steel bars. Concrete is filled and poured between the U-shaped through groove and the end of the bridge deck. The present invention can achieve dry steel-concrete connection and replace the wet joints between traditional bridge decks, improving the assembly construction efficiency, durability and life cycle.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and particularly relates to a steel-concrete connection structure for a dry precast concrete bridge deck and a manufacturing method thereof. Background Art

[0002] The connection structures of ordinary concrete precast bridge decks are mainly divided into two types: wet joints and dry joints. Among them, in terms of force transmission, according to the different ways of wet joints transmitting shear force and bending moment, they are divided into continuous wet joints (shear force - bending moment) and discontinuous wet joints (shear force). In terms of the joint position, they can be divided into wet joints on the beam flange and wet joints outside the flange; in terms of the joint direction, they can be divided into transverse wet joints (mainly subjected to flexure and tension in the negative moment area) and longitudinal wet joints (mainly subjected to flexure and shear); in terms of the connection method, wet joints are further divided into wet joints with welded steel plates, wet joints with bolted steel plates, wet joints with ordinary steel bars, and wet joints with prestressed steel bars.

[0003] At the present stage, in actual production and application, wet joints composed of ordinary concrete with welded ring-shaped steel bars are mainly used, but they have a large amount of work, slow construction speed, and poor interface bonding strength. The application of wet joints is extensive. For the reinforcement layout form of precast bridge decks, concrete curing has high requirements for on-site construction accuracy. During the construction stage, problems such as longitudinal steel bar misalignment, cumbersome welding, difficult on-site curing, long construction period, etc. are likely to occur, and the quality of on-site wet construction is also affected by factors such as weather, artificial skills, and environmental conditions. Summary of the Invention

[0004] The purpose of the invention is to overcome the deficiencies in the prior art and provide a steel-concrete connection structure for a dry precast concrete bridge deck and a manufacturing method thereof, which can replace wet joint connections, realize dry steel-concrete connections between bridge decks, improve the anti-bearing and durability performance of bridge deck connections, and improve the on-site assembly construction efficiency.

[0005] To achieve the above purpose, the invention is implemented by the following technical solutions:

[0006] In the first aspect, the invention provides a steel-concrete connection structure for a dry precast concrete bridge deck, including two precast concrete bridge decks to be connected, and steel-concrete connectors that are symmetrically connected in pairs on the left and right are arranged between the two bridge decks;

[0007] The steel-concrete connector is provided with a U-shaped through groove with an opening facing the end of the bridge deck and matching the thickness of the bridge deck. Inside the U-shaped through groove, a plurality of perforated steel plates with several high-strength steel bars inserted therein and multiple groups of anchoring nails that are engaged with the transverse steel bars at the end of the bridge deck in an up-and-down toothed manner are respectively arranged at intervals along the length direction. A plurality of longitudinal circular steel bars arranged at intervals along the length direction of the U-shaped through groove on the end of the bridge deck are inserted into the U-shaped through groove in the depth direction and sleeved on the high-strength steel bars. Concrete is filled and cast between the U-shaped through groove and the end of the bridge deck.

[0008] Further, the U-shaped through groove includes a vertical steel plate, a first transverse steel plate, and a second transverse steel plate. The first transverse steel plate is fixedly connected to the top of the vertical steel plate. The second transverse steel plate is arranged in the middle of the vertical steel plate, and the distance between the second transverse steel plate and the first transverse steel plate matches the thickness of the bridge deck. A stiffening rib plate is provided at the angle between the bottom of the second transverse steel plate and the lower part of the vertical steel plate.

[0009] Further, each group of the anchoring nails is located on the center line of the distance between two adjacent longitudinal circular steel bars. The perforated steel plates are located on the center line of the distance between two adjacent longitudinal circular steel bars, and at least two longitudinal circular steel bars are arranged between adjacent perforated steel plates.

[0010] Further, each group of the anchoring nails includes a first anchor nail on the first transverse steel plate and a second anchor nail on the second transverse steel plate, and the second anchor nail is closer to the opening end of the U-shaped through groove than the first anchor nail. The lengths of the first anchor nail and the second anchor nail are 1 / 2 to 1 times the thickness of the bridge deck.

[0011] Further, when a group of the anchoring nails and the perforated steel plates are on the same center line, only the second anchor nail is provided in the corresponding group of the anchoring nails.

[0012] Further, the distance between adjacent perforated steel plates is greater than or equal to three times the height of the perforated steel plates. The thickness of the perforated steel plates is greater than or equal to the diameter of the high-strength steel bars. The diameter of the steel bar holes on the perforated steel plates is greater than or equal to the sum of the maximum particle size of the filled and cast concrete and the diameter of the high-strength steel bars.

[0013] Further, two steel bar holes are provided on the perforated steel plate, which are distributed vertically up and down away from the end of the bridge deck, and one steel bar hole is provided close to the end of the bridge deck, and the three steel bar holes are integrally in an equilateral triangle. The inner corners of the longitudinal circular steel bars are respectively fixedly and contact-bonded with the high-strength steel bars passing through the two vertical steel bar holes.

[0014] Second aspect, the present invention also provides a preparation method of the steel-concrete connection structure of the dry precast concrete bridge deck as described in any one of the first aspect, including the following method steps:

[0015] Prepare and weld the vertical steel plate, the first transverse steel plate, and the second transverse steel plate to form the U-shaped through groove structure of the steel-concrete connector;

[0016] Calculate, determine and select the perforated steel plates with a certain thickness and quantity according to the precast concrete bridge deck to be connected, and weld them in the U-shaped through groove along the length direction of the U-shaped through groove at a certain interval distance. At the same time, select and determine a certain number of groups of anchor bolts, and weld the first anchor bolt and the second anchor bolt in a vertically toothed bite shape in the U-shaped through groove;

[0017] Bind the steel bar meshes of the two precast concrete bridge decks to be connected. The precision rolled threaded steel bars are passed through the steel bar holes of the perforated steel plates, so that the longitudinal annular steel bars at the end of the bridge deck are sleeved on the precision rolled threaded steel bars, and the transverse steel bars at the end of the bridge deck are engaged between each group of vertically toothed bite anchor bolts;

[0018] Position between the vertical steel plates of the symmetrically arranged pairs of steel-concrete connectors, seal and weld between the top vertical steel plate and the first transverse steel plate, and fixedly connect the bottom of the vertical steel plate with high-strength bolts. Seal the templates at both ends of the transverse joint of the two bridge decks and pour concrete into the U-shaped through groove and the steel bar mesh of the bridge deck.

[0019] Further, the setting of the anchor bolts includes the following steps:

[0020] Multiple groups of the anchor bolts are located between the perforated steel plates and the end of the bridge deck, and the second anchor bolts arranged on the second transverse steel plate are closer to the open end of the U-shaped through groove;

[0021] Each group of the anchor bolts is located on the center line of the spacing between two adjacent longitudinal annular steel bars. The perforated steel plates are located on the center line of the spacing between two adjacent longitudinal annular steel bars, and at least two longitudinal annular steel bars are arranged between adjacent perforated steel plates;

[0022] When each group of the anchor bolts and the perforated steel plates are on the same center line, only one upward-extending second anchor bolt is arranged at the bottom in a group of the anchor bolts corresponding to the U-shaped through groove;

[0023] The lengths of the first anchor bolt and the second anchor bolt in each group of the anchor bolts are 1 / 2 to 1 times the thickness of the bridge deck.

[0024] Further, the setting of the perforated steel plates, the precision rolled threaded steel bars and the longitudinal annular steel bars includes the following steps:

[0025] The specification parameters of the longitudinal circular steel bars in the end reinforcement mesh of the bridge deck slab are calculated according to the theoretical reinforcement calculation of the ideal tension-compression bar simplified model;

[0026] There are two reinforcing bar holes vertically distributed up and down away from the end of the bridge deck slab and one reinforcing bar hole close to the end of the bridge deck slab and integrally in an equilateral triangle shape on the perforated steel plate. The diameter of the reinforcing bar holes on the perforated steel plate is greater than or equal to the sum of the maximum particle size of the filled and cast concrete and the diameter of the precision rolled threaded steel bar;

[0027] The spacing between adjacent perforated steel plates is greater than or equal to three times the height of the perforated steel plate, and the thickness of the perforated steel plate is greater than or equal to the diameter of the precision rolled threaded steel bar;

[0028] The threaded straight steel bars calculated by reinforcement are bent to form longitudinal circular steel bars in a closed ring shape, and the inner sides of the corners of the longitudinal circular steel bars are respectively fixedly contact-bonded and connected with the precision rolled threaded steel bars passing through the two vertical reinforcing bar holes.

[0029] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0030] The present invention adopts paired and symmetrically connected steel-concrete connectors arranged at the joints of precast concrete bridge deck slabs. Through multiple groups of anchor nails in the steel-concrete connectors engaging with the transverse steel bars in a toothed shape up and down, and the longitudinal circular steel bars being sleeved into the precision rolled threaded steel bars in the perforated steel plate in depth, the steel-concrete dry connection is effectively realized;

[0031] At the same time, under the action of negative bending moment, the main area where structural cracks develop is transferred to the precast concrete bridge deck slab, and the perforated steel plate can effectively transfer the tensile stress of the longitudinal circular steel bars, improving the flexural bearing capacity of the bridge deck slab;

[0032] It is welded and formed between the vertical steel plate, the first transverse steel plate, the second transverse steel plate, the perforated steel plate, and the stiffening rib plate. The structure is simple to manufacture and convenient for on-site assembly construction; the stiffening rib plate increases the connection length between the vertical steel plates and effectively reduces the tensile stress at the connection. The first transverse steel plate can connect between the bridge deck slabs. Using top seal welding and bottom high-strength bolt connection helps to improve the water permeability and durability of the steel-concrete connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a three-dimensional schematic diagram of a dry precast concrete bridge deck steel-concrete connection structure provided by an embodiment of the present invention;

[0034] Figure 2 is a front view cross-sectional view of a dry precast concrete bridge deck steel-concrete connection structure provided by an embodiment of the present invention;

[0035] Figure 3It is a top view cross-sectional view of a dry precast concrete bridge deck steel-concrete connection structure provided according to an embodiment of the present invention;

[0036] Figure 4 It is a front view of a steel-concrete connector provided according to an embodiment of the present invention;

[0037] Figure 5 It is a rear view of a steel-concrete connector provided according to an embodiment of the present invention;

[0038] In the figure:

[0039] 1. Vertical steel plate; 2. First transverse steel plate; 3. Second transverse steel plate; 4. Perforated steel plate; 5. Stiffening rib plate; 6. Anchor nail; 7. First anchor bolt; 8. Second anchor bolt; 9. Fine rolled threaded steel bar; 10. Transverse steel bar; 11. Longitudinal circular steel bar; 12. Bridge deck; 13. Reinforcement hole; 14. Bolt hole; 15. Bolt. Detailed implementation manners

[0040] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0043] AsFigures 1 to 5 As shown in the figure, in an embodiment of the present invention, a dry precast concrete bridge deck steel-concrete connection structure is provided, which includes two precast concrete bridge decks 12 to be connected. There are steel-concrete connectors symmetrically connected in pairs on the left and right between the two bridge decks 12.

[0044] As Figure 1 and Figure 2 shown, the steel-concrete connector is provided with a U-shaped through groove with an opening facing the end of the bridge deck 12 and matching the thickness of the bridge deck 12. Among them, the U-shaped through groove includes a vertical steel plate 1, a first transverse steel plate 2 and a second transverse steel plate 3. The first transverse steel plate 2 is fixedly connected to the top of the vertical steel plate 1. The second transverse steel plate 3 is arranged in the middle of the vertical steel plate 1 and the distance between the second transverse steel plate 3 and the first transverse steel plate 2 matches the thickness of the bridge deck 12. A stiffening rib plate 5 is provided at the angle between the bottom of the second transverse steel plate 3 and the lower part of the vertical steel plate 1.

[0045] In this embodiment, as Figure 1 , Figure 4 and Figure 5 shown, a plurality of bolt holes 14 for passing high-strength bolts 15 are uniformly arranged along the length direction at the lower part of the vertical steel plate 1, which are used to fixedly connect two symmetrically arranged steel-concrete connectors in pairs. At the same time, the tops of the vertical steel plates 1 of two symmetrically arranged steel-concrete connectors in pairs are fixedly connected by a sealed welding process, and the two first transverse steel plates 2 are flush and sealed, which is helpful for the water seepage performance and durability of the steel-concrete connection structure.

[0046] It should be noted that the steel-concrete connector can be fabricated by the above-mentioned multi-steel plate welding and assembling method, or can be an integral forming structure such as stamping and pouring.

[0047] In some embodiments, as Figure 1 , Figure 2 , Figure 3 shown, a plurality of perforated steel plates 4 with several precision rolled thread steel bars 9 passing through them and a plurality of groups of anchor nails 6 that are engaged with the transverse steel bars 10 at the end of the bridge deck 12 in an upper and lower toothed shape are respectively arranged at intervals along the length direction of the cavity of the U-shaped through groove. It should be noted that the length direction of the cavity of the U-shaped through groove is the same as the direction of the joint gap between the bridge decks 12.

[0048] A plurality of groups of anchor nails 6 are arranged in a row on the same straight line along the length direction of the cavity, and the whole is the same as or parallel to the direction of the joint gap between the bridge decks 12. In addition, the plurality of groups of anchor nails 6 can also be arranged in a staggered manner at intervals in a wavy shape along the length direction of the cavity.

[0049] Each group of anchor studs 6 includes a first anchor stud 7 located on the first transverse steel plate 2 and a second anchor stud 8 located on the second transverse steel plate 3, and the second anchor stud 8 is closer to the opening end of the U-shaped through groove than the first anchor stud 7. The lengths of the first anchor stud 7 and the second anchor stud 8 are 1 / 2 to 1 times the thickness of the bridge deck 12. Setting the length of the anchor studs within 1 / 2 - 1 times the thickness of the bridge deck 12 enables the toothed anchor studs 6 to have better anchoring ability, uniform stress development in the bridge deck 12, not easily causing local stress concentration and fracture, and having good shear deformation performance.

[0050] Each group of anchor studs 6 is located on the center line of the spacing between two adjacent longitudinal circular steel bars 11. The perforated steel plate 4 is located on the center line of the spacing between two adjacent longitudinal circular steel bars 11, and at least two longitudinal circular steel bars 11 are arranged between adjacent perforated steel plates 4.

[0051] When a group of anchor studs 6 and the perforated steel plate 4 are on the same center line, only the second anchor stud 8 is provided in the corresponding group of anchor studs 6. Each of the first anchor studs 7 and the second anchor studs 8 in the anchor studs 6 is evenly arranged and located at the center position between adjacent longitudinal circular steel bars 11 and adjacent transverse steel bars 10. The steel-concrete connector is more suitable for UHPC precast slabs with high tensile performance. This type of slab has a relatively thin thickness, and the longitudinal steel bar spacing in the steel cage of the bridge deck 12 is small. If the spacing between the anchor studs and the steel bars is too small, its anchoring performance will be significantly reduced. Therefore, evenly setting the positions of the anchor studs is beneficial for the steel-concrete connector and the bridge deck 12 to fully exert their mechanical properties.

[0052] A number of longitudinal circular steel bars 11 are arranged in a row at intervals along the length direction of the U-shaped through groove at the end of the bridge deck 12 and are inserted deeply into the U-shaped through groove and sleeved on the precision rolled threaded steel bar 9. Concrete is filled and poured between the U-shaped through groove and the end of the bridge deck 12.

[0053] Among them, the inner side of the corner of the longitudinal circular steel bar 11 is in contact and fixedly connected with the precision rolled threaded steel bar 9 near the deep end of the U-shaped through groove, playing a role of restraint and fixation to facilitate obtaining better connection performance and effectively transmitting the tensile stress of the steel bars.

[0054] In some embodiments, the spacing between adjacent perforated steel plates 4 is greater than or equal to three times the height of the perforated steel plate 4. The thickness of the perforated steel plate 4 is greater than or equal to the diameter of the precision rolled threaded steel bar 9. The diameter of the steel bar hole 13 on the perforated steel plate 4 is greater than or equal to the sum of the maximum particle size of the filled and poured concrete and the diameter of the precision rolled threaded steel bar 9, so that the requirements for the aperture of the perforated steel plate 4 meet the reasonable structural requirements for the PBL shear connector to fully exert its shear performance.

[0055] There are three steel bar holes 13 on the perforated steel plate 4, two of which are vertically distributed up and down away from the end of the bridge deck 12 and one is close to the end of the bridge deck 12 and is overall in an equilateral triangle shape. The inner corners of the longitudinal circular steel bars 11 are respectively fixedly and contact-bonded with the fine-threaded steel bars 9 passing through the two vertical steel bar holes 13.

[0056] In some embodiments, the distance between the first anchor bolt 7 and the second anchor bolt 8 is greater than 110 mm, and the distance between the second anchor bolt 8 and the open end of the U-shaped through groove formed by the first transverse steel plate 2 and the second transverse steel plate 3 is greater than 25 mm. The distance between the perforated steel plates 4 is equal to 3 times the height of the perforated steel plate 4, and the distance between the steel bar holes 13 is greater than or equal to 50 mm.

[0057] In some embodiments, in order to obtain a better anchoring effect, a round cake-shaped cap is fixedly arranged at the free ends of the first anchor bolt 7 and the second anchor bolt 8 respectively.

[0058] The embodiment of the present invention also provides a preparation method for the above dry precast concrete bridge deck steel-concrete connection structure, including the following method steps:

[0059] Prepare and weld the vertical steel plate 1, the first transverse steel plate 2, and the second transverse steel plate 3 to form the U-shaped through groove structure of the steel-concrete connector;

[0060] According to the precast concrete bridge deck 12 to be connected, calculate and determine and select perforated steel plates 4 with a certain thickness and quantity, and weld them in the U-shaped through groove along the length direction of the U-shaped through groove at a certain interval distance. At the same time, select and determine a certain number of groups of anchor bolts 6, and weld the first anchor bolt 7 and the second anchor bolt 8 in a vertically toothed bite shape in the U-shaped through groove, so that the second anchor bolt 8 is closer to the open end of the U-shaped through groove and is located on the same straight line along the length direction of the cavity groove, so as to facilitate biting on the same transverse steel bar 10;

[0061] Bind the steel bar meshes of the two precast concrete bridge decks 12 to be connected. The fine-threaded steel bars 9 pass through the steel bar holes 13 of the perforated steel plate 4, so that the longitudinal circular steel bars 11 at the end of the bridge deck 12 are sleeved on the fine-threaded steel bars 9, and the transverse steel bars 10 at the end of the bridge deck 12 are bitten between the first anchor bolt 7 and the second anchor bolt 8 of each group of vertically toothed bite anchor bolts 6;

[0062] Position between the vertical steel plates 1 of the symmetrically arranged pairs of steel-concrete connectors, seal-weld between the top vertical steel plate 1 and the first transverse steel plate 2 and fixedly connect the bottom of the vertical steel plate 1 with high-strength bolts 15, so that the first transverse steel plate 2 is flush with the bridge deck 12 or covers the bridge deck 12. Seal the templates at both ends of the transverse joints of the two bridge decks 12 and pour concrete into the U-shaped through groove and the steel bar mesh of the bridge deck 12.

[0063] In some embodiments, the setting of the anchor bolts 6 should meet the following steps:

[0064] Multiple groups of anchor bolts 6 are located between the perforated steel plate 4 and the end of the bridge deck 12, and the second anchor bolt 8 arranged on the second transverse steel plate 3 is closer to the open end of the U-shaped through groove;

[0065] Each group of anchor bolts 6 is located on the center line of the spacing between two adjacent longitudinal circular steel bars 11. The perforated steel plate 4 is located on the center line of the spacing between two adjacent longitudinal circular steel bars 11, and at least two longitudinal circular steel bars 11 are arranged between adjacent perforated steel plates 4;

[0066] When each group of anchor bolts 6 and the perforated steel plate 4 are on the same center line, only one second anchor bolt 8 extending upward is provided at the bottom in a group of anchor bolts 6 corresponding to the U-shaped through groove;

[0067] The lengths of the first anchor bolt 7 and the second anchor bolt 8 in each group of anchor bolts 6 are 1 / 2 to 1 times the thickness of the bridge deck 12.

[0068] In some embodiments, the arrangement of the perforated steel plate 4, the rolled thread steel bar 9 and the longitudinal circular steel bar 11 should meet the following steps:

[0069] The specification parameters of the longitudinal circular steel bar 11 in the end reinforcement mesh of the bridge deck 12 are calculated according to the simplified model of the ideal tension and compression bar for theoretical reinforcement;

[0070] Two reinforcing bar holes 13 are arranged on the perforated steel plate 4 and are vertically distributed up and down away from the end of the bridge deck 12, and one is close to the end of the bridge deck 12 and the overall shape is an equilateral triangle. The diameter of the reinforcing bar hole 13 on the perforated steel plate 4 is greater than or equal to the sum of the maximum particle size of the filled and poured concrete and the diameter of the rolled thread steel bar 9;

[0071] The spacing between adjacent perforated steel plates 4 is greater than or equal to three times the height of the perforated steel plate 4, and the thickness of the perforated steel plate 4 is greater than or equal to the diameter of the rolled thread steel bar 9;

[0072] The threaded straight steel bar obtained by reinforcement calculation is bent to form a longitudinal circular steel bar 11 in a closed ring shape, and the inner sides of the corners of the longitudinal circular steel bar 11 are respectively fixedly contacted and tied to the rolled thread steel bars 9 passing through the two vertical reinforcing bar holes 13.

[0073] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A dry precast concrete bridge deck steel-concrete connection structure, comprising two precast concrete bridge decks to be connected, characterized in that, There are steel-concrete connectors that are symmetrically connected in pairs on the left and right between the two bridge decks. On the steel-concrete connector, there is a U-shaped through groove with an opening facing the end of the bridge deck and matching the thickness of the bridge deck. Inside the U-shaped through groove, a plurality of perforated steel plates with several high-strength deformed bars passing through are respectively arranged at intervals along the length direction, and a plurality of groups of anchoring nails that are engaged with the transverse steel bars at the end of the bridge deck in an up-and-down toothed shape are provided. A plurality of longitudinal circular steel bars arranged at intervals along the length direction of the U-shaped through groove on the end of the bridge deck are inserted into the U-shaped through groove along the depth direction and sleeved on the high-strength deformed bars. Concrete is filled and poured between the U-shaped through groove and the end of the bridge deck. The U-shaped through groove includes a vertical steel plate, a first transverse steel plate, and a second transverse steel plate. The first transverse steel plate is fixedly connected to the top of the vertical steel plate. The second transverse steel plate is arranged in the middle of the vertical steel plate, and the distance between the second transverse steel plate and the first transverse steel plate matches the thickness of the bridge deck. A stiffening rib plate is provided at the angle between the bottom of the second transverse steel plate and the lower part of the vertical steel plate. Each group of the anchoring nails includes a first anchor nail on the first transverse steel plate and a second anchor nail on the second transverse steel plate, and the second anchor nail is closer to the opening end of the U-shaped through groove than the first anchor nail. When a group of the anchoring nails and the perforated steel plate are on the same center line, only the second anchor nail is provided in the corresponding group of the anchoring nails. The lengths of the first anchor nail and the second anchor nail are 1 / 2 to 1 times the thickness of the bridge deck.

2. The dry precast concrete bridge deck steel-concrete connection structure according to claim 1, characterized in that Each group of the anchoring nails is located on the center line of the distance between two adjacent longitudinal circular steel bars. The perforated steel plate is located on the center line of the distance between two adjacent longitudinal circular steel bars, and at least two longitudinal circular steel bars are arranged between adjacent perforated steel plates.

3. The dry precast concrete bridge deck steel-concrete connection structure according to claim 1, characterized in that, The distance between adjacent perforated steel plates is greater than or equal to three times the height of the perforated steel plate. The thickness of the perforated steel plate is greater than or equal to the diameter of the high-strength deformed bar. The diameter of the steel bar hole on the perforated steel plate is greater than or equal to the sum of the maximum particle size of the filled and poured concrete and the diameter of the high-strength deformed bar.

4. The dry precast concrete bridge deck steel-concrete connection structure according to claim 3, characterized in that, Two steel bar holes are opened on the perforated steel plate and are distributed vertically up and down away from the end of the bridge deck, and one steel bar hole is close to the end of the bridge deck and the three steel bar holes are in an overall equilateral triangle shape. The inner corners of the longitudinal circular steel bars are respectively fixedly contacted and tied to the high-strength deformed bars passing through the two vertical steel bar holes.

5. A preparation method for the steel-concrete connection structure of the dry precast concrete bridge deck according to any one of claims 1 to 4, characterized in that, It includes the following method steps: Prepare and weld the vertical steel plate, the first transverse steel plate, and the second transverse steel plate to form the U-shaped through groove structure of the steel-concrete connector. Calculate, determine, and select perforated steel plates with a certain thickness and quantity according to the precast concrete bridge deck to be connected, and weld them into the U-shaped through groove along the length direction of the U-shaped through groove at a certain interval distance. At the same time, select and determine a certain number of multiple groups of anchoring nails, and weld the first anchor nail and the second anchor nail in an up-and-down toothed shape into the U-shaped through groove. Bind the steel bar meshes of two precast concrete bridge decks to be connected. The precision rolled threaded steel bars are passed through the steel bar holes of the perforated steel plates, so that the longitudinal circular steel bars at the end of the bridge deck are sleeved on the precision rolled threaded steel bars, and the transverse steel bars at the end of the bridge deck are engaged between each group of anchoring nails with upper and lower toothed engagement; Position between the vertical steel plates of the paired and symmetrically arranged steel-concrete connectors, seal-weld between the top vertical steel plate and the first transverse steel plate, and fixedly connect the bottom of the vertical steel plate with high-strength bolts. Seal the templates at both ends of the transverse joint of the two bridge decks and pour concrete into the U-shaped through groove and the steel bar mesh of the bridge deck.

6. The preparation method of the dry precast concrete bridge deck steel-concrete connection structure according to claim 5, characterized in that, The setting of the anchoring nails includes the following steps: Multiple groups of the anchoring nails are located between the perforated steel plate and the end of the bridge deck, and the second anchoring nails arranged on the second transverse steel plate are closer to the opening end of the U-shaped through groove; Each group of the anchoring nails is located on the center line of the spacing between two adjacent longitudinal circular steel bars. The perforated steel plate is located on the center line of the spacing between two adjacent longitudinal circular steel bars, and at least two longitudinal circular steel bars are arranged between adjacent perforated steel plates; When a group of the anchoring nails and the perforated steel plate are on the same center line, only one upward-extending second anchoring nail is arranged at the bottom in a group of the anchoring nails corresponding to the U-shaped through groove; The lengths of the first anchoring nail and the second anchoring nail in each group of the anchoring nails are 1 / 2 to 1 times the thickness of the bridge deck.

7. The preparation method of the dry precast concrete bridge deck steel-concrete connection structure according to claim 6, characterized in that, The setting of the perforated steel plate, the precision rolled threaded steel bars and the longitudinal circular steel bars includes the following steps: The specification parameters of the longitudinal circular steel bars in the steel bar mesh at the end of the bridge deck are calculated according to the theoretical reinforcement of the ideal tension-compression bar simplified model; Two steel bar holes are opened on the perforated steel plate, which are vertically distributed up and down away from the end of the bridge deck, and one steel bar hole is close to the end of the bridge deck and the three steel bar holes are integrally in an equilateral triangle shape. The diameter of the steel bar holes on the perforated steel plate is greater than or equal to the sum of the maximum particle size of the filled and poured concrete and the diameter of the precision rolled threaded steel bars; The spacing between adjacent perforated steel plates is greater than or equal to three times the height of the perforated steel plate, and the thickness of the perforated steel plate is greater than or equal to the diameter of the precision rolled threaded steel bars; The threaded straight steel bars calculated by reinforcement are bent to form longitudinal circular steel bars in a closed loop shape, and the inner sides of the corners of the longitudinal circular steel bars are respectively fixedly contacted and tied to the precision rolled threaded steel bars passing through the two vertical steel bar holes.

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