A continuous bridge deck cross-seam plate structure and its construction method

Abstract

The present invention relates to a bridge deck continuous cross-seam plate structure and its construction method, including a cross-seam plate spanning over the upper side of the expansion joint between the main girders on both sides of the bridge deck. The cross-seam plate comprises a cross-seam plate body horizontally arranged inside the reserved notch of the expansion joint at the beam ends of the main girders on both sides of the bridge deck. The left and right ends of the cross-seam plate body are respectively fixedly connected with π-shaped steel plates, and the π-shaped steel plates are fixedly connected with the main girders. By setting the connection structure of the π-shaped steel plates at both ends of the cross-seam plate body, the bending stiffness and axial stiffness of the connection at the end of the cross-seam plate are reduced, and the bending moment and axial force generated by the rotation and axial deformation of the beam end of the main girder under the action of various complex loads can be effectively absorbed, solving the problems of poor durability and service performance caused by inevitable concrete cracking, steel bar corrosion and drainage leakage under the combined action of loads such as vehicle live load, temperature change and braking force in the traditional bridge deck continuous structure.

Description

Technical Field:

[0002] The present invention belongs to the technical field of bridge engineering, and particularly relates to a continuous bridge deck cross-seam plate structure and a construction method thereof. Background Art:

[0004] The continuous bridge deck structure of a simply supported beam bridge is an integral structure in which a connecting plate is combined with the main beam to form a continuous bridge deck, while the main beam maintains its simply supported system. The continuous bridge deck structure is a weak link of the simply supported continuous bridge deck, located at both ends of the simply supported beam main beam, at the position where the beam body has the largest rotational and axial telescopic deformations, with complex forces, and is prone to diseases such as cracking and damage soon after being put into use.

[0005] Since the continuous bridge deck structure of a simply supported beam bridge can effectively reduce the number of traditional bridge deck expansion joints of a simply supported beam bridge, improve the smoothness of driving, and reduce the workload of maintenance and repair, it has been widely used in the engineering field. The common continuous bridge deck structures mainly have the following three forms: one is the rigid-connected continuous bridge deck structure; the second is the tie-bar type continuous bridge deck structure; the third is the hinged continuous bridge deck structure.

[0006] The rigid-connected continuous bridge deck structure is similar to a fixed-end beam embedded in the main beam in terms of structural form, and its span is the length of the continuous bridge deck structure. However, such a structure is extremely prone to cracking at the reserved slot and the two ends of the main beam. The tie-bar type continuous bridge deck structure makes the continuous bridge deck structure as a "filling section" as a whole to act together with the bridge deck pavement. Wood boards or saw cuts are provided at both ends of the continuous bridge deck structure. It can greatly weaken the flexural capacity of the cross-section at this place, allow the continuous bridge deck structure to rotate on this surface, thereby reducing the restraint of the pavement layer on the beam slab and reducing the internal force at the pavement layer. However, the position of the saw cut has also become a position prone to cracking and breaking under the action of vehicle loads. The hinged continuous bridge deck structure is provided with an artificial discontinuous joint, which allows the connecting steel bars to produce small vertical displacements. The deflection of the support caused by the bending of the main beam will not cause the hinged continuous bridge deck structure to generate bending moments. However, this method has a complex structure, inconvenient construction, and cannot solve the problem of steel bar corrosion caused by water seepage at the hinge joint, and is basically no longer used at present.

[0007] In view of the above problems, various treatment methods for continuous bridge deck joints have also been proposed. An unbonded length of about 5% - 7.5% of the main beam span is set at both ends of the main beam, and the involved reconstruction lengths are relatively large. For example, the method of arranging an ECC connecting plate fixedly connected to the main beam above the adjacent main beam connection area and setting a sliding layer between the ECC plate and the main beam is adopted. In addition to the large reconstruction length, the cost of ECC materials is very high, which is 10 - 15 times that of traditional concrete materials, and is not conducive to popularization and application. CN108035252A proposes a continuous bridge deck structure for a simply supported beam bridge suitable for an inverted T-shaped capping beam, but its applicable surface is relatively narrow. Summary of the Invention:

[0009] The present invention makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a bridge deck continuous span slab structure and a construction method thereof, which is not only reasonably designed but also has good durability and performance.

[0010] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a continuous span plate structure of a bridge deck, including a span plate spanning the upper side of the expansion joint between the main beams on both sides of the bridge deck, the span plate including a span plate body located inside the reserved groove of the expansion joint at the ends of the main beams on both sides of the bridge deck, the left and right ends of the span plate body are respectively fixedly connected with π-shaped steel plates, and the π-shaped steel plates are fixedly connected to the main beams.

[0011] Furthermore, the seam-spanning plate body includes a steel cage and concrete poured inside and outside the steel cage, and the inner end of the π-shaped steel plate is fixedly connected to the steel cage.

[0012] Furthermore, the steel cage includes a plurality of rectangular ring-shaped stress-bearing steel bars spaced apart in the longitudinal direction, and a plurality of longitudinal steel bars spaced apart in the transverse direction are provided at the upper and lower ends of the plurality of stress-bearing steel bars, and the longitudinal steel bars are tied and fixed to the stress-bearing steel bars; the vertical steel plate at the inner end of the π-shaped steel plate is welded and fixed to the stress-bearing steel bars.

[0013] Furthermore, a plurality of connection holes are longitudinally spaced apart on the upper horizontal steel plate at the bottom of the outer end of the π-shaped steel plate; embedded bolts corresponding to the positions of the plurality of connection holes are embedded in the bottom of the reserved notch of the expansion joint, and the π-shaped steel plate is locked and fixed by screwing the embedded bolts passing through the connection holes and nuts.

[0014] Furthermore, sealing concrete is poured on the upper side of the embedded bolts.

[0015] Furthermore, a concrete leveling pad is laid at the bottom of the reserved notch of the expansion joint, and the cross-joint plate is located on the upper side of the concrete leveling pad.

[0016] Furthermore, a sliding layer is provided between the concrete leveling pad and the seam-crossing plate body, and the sliding layer is located between the lower ends of the π-shaped steel plates at the left and right ends of the seam-crossing plate body.

[0017] Furthermore, it also includes a bridge deck pavement layer located on the upper side of the main beam and the span plate, the bridge deck pavement layer is flush with the top surface of the π-shaped steel plate, and a bridge deck concrete cushion layer is provided between the bridge deck pavement layer and the top surface of the main beam.

[0018] Furthermore, the cross-seam plate is cast on site or prefabricated in a factory.

[0019] Another technical solution adopted by the present invention is: a construction method for a continuous bridge deck cross-seam plate structure, and the construction method comprises the following steps:

[0020] (1) Reconstruction of existing bridges:

[0021] Step 101: According to the design requirements, chisel the concrete in the reserved slots of the expansion joints at the ends of the main girders on both sides of the original bridge deck, and chisel the height of the reserved slots of the expansion joints to the elevation required by the design;

[0022] Step 102: Using drilling equipment, drill embedded bolt holes at the bottom of the reserved slots of the expansion joints according to the layout of the connection holes on the π-shaped steel plate, install embedded bolts in the embedded bolt holes, and then pour a concrete leveling cushion at the bottom of the reserved slots of the expansion joints;

[0023] Step 103: Lay a sliding layer on the concrete leveling cushion, and lock and fix the π-shaped steel plate and the embedded bolts through nuts to realize the fixed connection between the π-shaped steel plate and the main girder;

[0024] Step 104: Weld and fix the stress-bearing steel bars to the vertical steel plate at the inner end of the π-shaped steel plate, tie longitudinal steel bars on the stress-bearing steel bars, and the stress-bearing steel bars and the longitudinal steel bars form a steel reinforcement cage;

[0025] Step 105: Pour concrete on the upper sides of the steel reinforcement cage and the embedded bolts;

[0026] Step 106: After the concrete poured in Step 105 reaches the design strength, construct the bridge deck paving layer;

[0027] (2) For newly built bridges:

[0028] Step 201: According to the design requirements, when constructing the ends of the main girders on both sides of the bridge deck, install embedded bolts according to the layout of the connection holes on the π-shaped steel plate;

[0029] Step 202: After the construction of the main girders on both sides of the bridge deck is completed, pour a concrete leveling cushion at the bottom of the reserved slots of the expansion joints at the ends of the main girders and reach the strength requirements;

[0030] Step 203: Lay a sliding layer on the concrete leveling cushion, and lock and fix the π-shaped steel plate and the embedded bolts through nuts to realize the fixed connection between the π-shaped steel plate and the main girder;

[0031] Step 204: Weld and fix the stress-bearing steel bars to the vertical steel plate at the inner end of the π-shaped steel plate, tie longitudinal steel bars on the stress-bearing steel bars, and the stress-bearing steel bars and the longitudinal steel bars form a steel reinforcement cage;

[0032] Step 205: Pour concrete on the upper sides of the steel reinforcement cage and the embedded bolts;

[0033] Step 206: After the concrete poured in Step 205 reaches the designed strength, construct the bridge deck pavement layer.

[0034] Compared with the prior art, the present invention has the following effects:

[0035] (1) The structure has simple and clear force, easy design analysis, can be realized within the reserved notch of the traditional expansion joint, and has a small transformation range. It is suitable for both the design of new bridges and the transformation of existing medium and small-span bridges.

[0036] (2) By setting the π-shaped steel plates at both ends of the cross-gap plate to reduce the flexural stiffness and axial tension and compression stiffness of the cross-gap plate, it can well adapt to the deformation of the main girder, with small structural force, not easy to generate cracks, improving the mechanical properties of the cross-gap plate, and enhancing the integrity and durability of the cross-gap plate structure.

[0037] (3) Through the π-shaped steel plates, the beam end rotation angle and telescopic deformation of the main girder caused by the vehicle load, temperature load, shrinkage and creep of the superstructure are absorbed. The force on the cross-gap plate itself is very small, and it can be constructed with ordinary concrete materials, with low cost and simple construction. It is suitable for both in-situ casting and precast assembly, and is easy to be popularized and applied. Description of the Drawings:

[0039] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0040] Figure 2 is a front view sectional structural schematic diagram of an embodiment of the present invention.

[0041] In the figure:

[0042] 1 - π-shaped steel plate; 2 - embedded bolt; 3 - stress bar; 4 - longitudinal bar; 5 - cross-gap plate body; 6 - bridge deck pavement layer; 7 - bridge deck concrete cushion; 8 - sealing bolt concrete; 9 - concrete leveling cushion; 10 - sliding layer; 11 - main girder; 12 - expansion joint; 13 - capping beam; 14 - main girder bearing; 15 - expansion joint reserved notch. Specific Embodiments:

[0044] The following further elaborates on the present invention in detail in conjunction with the drawings and specific embodiments.

[0045] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] like Figures 1 to 2 As shown, a continuous span plate structure of a bridge deck of the present invention is suitable for the design of new bridges and the reconstruction of existing bridges, and is used to solve the problems existing in the prior art and the problem that traditional devices are prone to diseases, including a span plate spanning the upper side of the expansion joint 12 between the main beams 11 on both sides of the bridge deck, and the span plate includes a span plate body 5 horizontally arranged inside the expansion joint reserved notch 15 at the ends of the main beams 11 on both sides of the bridge deck, and the left and right ends of the span plate body 5 are respectively fixedly connected with π-shaped steel plates 1, and the π-shaped steel plates 1 are fixedly connected to the main beams 11. By arranging the connection structure of the π-shaped steel plates at both ends of the span plate body, the bending stiffness and axial stiffness of the end connection of the span plate are reduced, and the bending moment and axial force generated by the rotation and axial deformation of the main beam ends under various complex loads can be effectively absorbed.

[0047] It should be noted that the inner end and the outer end of the π-shaped steel plate 1 are both L-shaped composed of vertical steel plates and horizontal steel plates, and the upper parts of the inner end and the outer end of the π-shaped steel plate 1 are connected as a whole.

[0048] In this embodiment, the cross-slot plate body 5 includes a longitudinally arranged steel cage and concrete poured inside and outside the steel cage, that is, the cross-slot plate body is a reinforced concrete structure. The steel cage includes a plurality of rectangular ring-shaped stress-bearing steel bars 3 spaced apart in the longitudinal direction, and a plurality of longitudinal steel bars 4 spaced apart in the transverse direction are arranged at the upper and lower ends of the plurality of stress-bearing steel bars 3, and the longitudinal steel bars 4 are tied and fixed to the stress-bearing steel bars 3; the vertical steel plate at the inner end of the π-shaped steel plate 1 is welded and fixed to the stress-bearing steel bars 3. In order to improve the structural strength of the stress-bearing steel bars, the stress-bearing steel bars are a closed-loop structure.

[0049] In this embodiment, the π-shaped steel plate 1 can be formed by steel plate compression molding or welding of multiple steel plates. A plurality of connecting holes are provided at equal intervals in the longitudinal direction on the horizontal steel plate at the bottom of the outer end of the π-shaped steel plate 1. The bottom of the expansion joint reserved notch 15 is pre-embedded with embedded bolts 2 corresponding to the positions of the plurality of connecting holes. The π-shaped steel plate 1 is locked and fixed by screwing the embedded bolts 2 passing through the connecting holes with nuts, thereby achieving a fixed connection between the π-shaped steel plate and the main beam.

[0050] In this embodiment, sealing concrete 8 is poured on the upper side of the embedded bolt 2 to seal the connection structure between the π-shaped steel plate and the embedded bolt.

[0051] In this embodiment, a concrete leveling pad 9 is laid at the bottom of the expansion joint reserved notch 15 , and the cross-joint plate is located on the upper side of the concrete leveling pad 9 .

[0052] In this embodiment, a sliding layer 10 is provided between the concrete leveling pad 9 and the span plate body 5, and the sliding layer 10 is located between the lower ends of the π-shaped steel plates 1 at the left and right ends of the span plate body 5. By providing the sliding layer, it is ensured that the reinforced concrete span plate and the main beam thereunder can slide freely, reducing the constraints between the two, improving the stress performance of the span plate, reducing the internal force of the plate, and preventing the span plate from cracking.

[0053] In this embodiment, it also includes a bridge deck pavement layer 6 located on the upper side of the main beam 11 and the span plate. The bridge deck pavement layer 6 is flush with the top surface of the π-shaped steel plate 1, and a bridge deck concrete cushion layer 7 is provided between the bridge deck pavement layer 6 and the top surface of the main beam 11.

[0054] In this embodiment, the main beam 11 is made of reinforced concrete, and a cap beam 13 is provided on the lower side of the bridge deck. The cap beam 13 is located between the lower sides of the main beams 11 on both sides of the bridge deck, and a main beam support 14 is provided between the cap beam 13 and each main beam 11. The expansion joint reserved notch 15 has an L-shaped cross section, and the expansion joint reserved notches 15 of the main beams 11 on both sides of the bridge deck are set downward to form a rectangular groove structure.

[0055] In this embodiment, the thickness of the span plate is relatively small, generally only between 15cm and 25cm, and can be constructed with ordinary reinforced concrete materials; the span plate can be cast on site or prefabricated in a factory and then hoisted on site. The implementation length of the span plate is relatively small, and can generally be realized in a very small range, so it can be widely used in the expansion joint reconstruction of existing small and medium span bridges, has a high market value, and has broad application prospects.

[0056] In this embodiment, during construction, the expansion joints between the main beams on both sides of the bridge deck are filled with foam rods with a height of 5 cm.

[0057] In this embodiment, the height of the π-shaped steel plate 1 can be adjusted according to the type of bridge deck pavement and the size of the reserved expansion joint slot. For bridge structures with asphalt concrete pavement, the casting position of the reinforced concrete span seam plate can be lowered to leave space for asphalt concrete pavement; for bridge structures with concrete bridge deck pavement, the top surface elevation of the reinforced concrete span seam plate and the π-shaped steel plate connected thereto is kept consistent with the elevation of the bridge deck pavement on both sides to ensure the smoothness of vehicle driving.

[0058] Example 1: For the renovation of existing bridges, in-situ casting construction is adopted, and the specific construction method is as follows:

[0059] Step 101: According to the design requirements, chisel the concrete in the expansion joint reserved slots 26 at the ends of the main girders 22 on both sides of the original bridge deck, and chisel the height of the expansion joint reserved slots 26 to the elevation required by the design.

[0060] Step 102: Using drilling equipment, drill embedded bolt holes at the bottom of the expansion joint reserved slots 26 according to the layout of the connection holes on the π-shaped steel plate 2. Install embedded bolts 2 in the embedded bolt holes, and then pour a concrete leveling cushion at the bottom of the expansion joint reserved slots.

[0061] Step 103: Stuff the expansion joint 12 between the main girders 11 on both sides of the bridge deck with a foamed rod with a height of 5 cm, and then lay a sliding layer 10 on the concrete leveling cushion 9.

[0062] Step 104: Lock and fix the π-shaped steel plate 1 to the embedded bolt 2 through nuts to realize the fixed connection between the π-shaped steel plate and the main girder.

[0063] Step 105: Weld and fix the stress-bearing steel bars 3 to the vertical steel plate at the inner end of the π-shaped steel plate 1, and tie longitudinal steel bars 4 to the stress-bearing steel bars 3. The stress-bearing steel bars 3 and the longitudinal steel bars 4 form a steel reinforcement cage.

[0064] Step 106: Pour concrete on the upper sides of the steel reinforcement cage and the embedded bolt 2.

[0065] Step 107: After the concrete poured in Step 106 reaches the design strength, construct the bridge deck pavement layer.

[0066] Example 2: This structure is used for new bridges, and in-situ casting construction is adopted. The specific construction method is as follows:

[0067] Step 201: According to the design requirements, when constructing the ends of the main girders 11 on both sides of the bridge deck, install the embedded bolts 2 according to the layout of the connection holes on the π-shaped steel plate 1.

[0068] Step 202: After the construction of the main girders 1 on both sides of the bridge deck is completed, pour a concrete leveling cushion 9 at the bottom of the expansion joint reserved slots 15 and cure it to reach the strength requirements.

[0069] Step 203: Lay a sliding layer 10 on the concrete leveling cushion 9, and lock and fix the π-shaped steel plate 1 to the embedded bolt 2 through nuts to realize the fixed connection between the π-shaped steel plate and the main girder.

[0070] Step 204: Weld and fix the stress-bearing steel bars 3 to the vertical steel plate at the inner end of the π-shaped steel plate 1, and tie longitudinal steel bars 4 to the stress-bearing steel bars 3. The stress-bearing steel bars and the longitudinal steel bars form a steel reinforcement cage.

[0071] Step 205: Pour concrete on the upper sides of the steel reinforcement cage and the embedded bolts.

[0072] Step 206: After the concrete poured in Step 205 reaches the design strength, construct the bridge deck paving layer.

[0073] Embodiment 3: This structure is used for the seamless transformation of existing bridges. The cross-seam plate is prefabricated in a factory. The specific construction method is as follows:

[0074] Step 301: According to the design requirements, chisel the concrete in the expansion joint reserved slots 15 at the beam ends of the main girders 11 on both sides of the original bridge deck, and chisel the height of the expansion joint reserved slots 15 to the elevation required by the design.

[0075] Step 302: Using drilling equipment, drill embedded bolt holes at the bottom of the expansion joint reserved slots 15 according to the layout of the connection holes on the π-shaped steel plate 1. Install the embedded bolts 2 in the embedded bolt holes, and then pour a concrete leveling cushion layer at the bottom of the expansion joint reserved slots.

[0076] Step 303: Stuff the expansion joint 12 between the main girders 11 on both sides of the bridge deck with a foamed rod with a height of 5 cm, and then lay a sliding layer 10 on the concrete leveling cushion layer 9.

[0077] Step 304: Transport the prefabricated cross-seam plate as a whole to the construction site, lift it with a crane, align and install it at the designated position, and lock and fix the π-shaped steel plate 1 and the embedded bolts 2 with nuts to realize the fixed connection between the π-shaped steel plate and the main girder.

[0078] Step 305: Pour concrete on the upper sides of the embedded bolts 2.

[0079] Step 306: After the concrete poured in Step 305 reaches the design strength, construct the bridge deck paving layer.

[0080] By setting π-shaped steel plates at both ends of the cross-seam plate body, the present invention absorbs the rotational and telescopic deformations of the beam ends of the two main girders on both sides, solves the problems of poor durability and service performance caused by inevitable concrete cracking, steel bar corrosion and drainage leakage under the combined action of vehicle live load, temperature change, braking force and other loads in the traditional bridge deck continuous structure. The structure is reliable, the construction process is simple, it is especially suitable for the situation where the length of the expansion joint reserved slot is short and the depth of the reserved slot is not large, has good adaptability to the seamless transformation of medium and small span bridges, and is more conducive to promoting the popularization and application of the bridge deck continuous structure. It is not only applicable to the design of new bridges, but also applicable to the transformation of expansion joints of existing bridges.

[0081] If the present invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected using bolts or screws), or it can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integral structure (for example, manufactured by integral forming using a casting process) (except where it is clearly impossible to use the integral forming process).

[0082] In addition, unless otherwise stated, the terms used to represent positional relationships or shapes in any of the technical solutions disclosed in the present invention described above include states or shapes that are approximate, similar, or close to them.

[0083] Any component provided by the present invention can either be assembled from a plurality of individual components or be a single component manufactured by an integral forming process.

[0084] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A bridge deck continuous cross - joint slab structure, Characterized in that: It includes a cross - joint slab spanning over the upper side of the expansion joint between the main girders on both sides of the bridge deck. The cross - joint slab comprises a cross - joint slab body located inside the reserved notch of the expansion joint at the beam ends of the main girders on both sides of the bridge deck. The left and right ends of the cross - joint slab body are respectively fixedly connected with a π - shaped steel plate, and the π - shaped steel plate is fixedly connected with the main girder; The cross - joint slab body includes a steel reinforcement cage and concrete poured inside and outside the steel reinforcement cage. The inner end of the π - shaped steel plate is fixedly connected with the steel reinforcement cage; The steel reinforcement cage includes several rectangular ring - shaped stress - bearing steel bars spaced longitudinally. At the upper and lower ends inside several stress - bearing steel bars, there are several longitudinal steel bars spaced transversely, and the longitudinal steel bars are tied and fixed with the stress - bearing steel bars; The vertical steel plate at the inner end of the π - shaped steel plate is welded and fixed with the stress - bearing steel bars; On the bottom horizontal steel plate at the outer end of the π - shaped steel plate, several connecting holes are arranged longitudinally at intervals; Embedded bolts corresponding to the positions of several connecting holes are pre - embedded at the bottom of the reserved notch of the expansion joint. The π - shaped steel plate is locked and fixed by screwing the embedded bolts passing through the connecting holes with nuts; A concrete leveling cushion layer is laid at the bottom of the reserved notch of the expansion joint, and the cross - joint slab is located on the upper side of the concrete leveling cushion layer; A sliding layer is provided between the concrete leveling cushion layer and the cross - joint slab body, and the sliding layer is located between the lower ends of the π - shaped steel plates at the left and right ends of the cross - joint slab body; It also includes a bridge deck pavement layer located above the main girder and the cross - joint slab. The bridge deck pavement layer is flush with the top surface of the π - shaped steel plate, and a bridge deck concrete cushion layer is provided between the top surface of the bridge deck pavement layer and the top surface of the main girder.

2. A bridge deck continuous cross - joint slab structure according to claim 1, Characterized in that: Sealing bolt concrete is poured above the embedded bolt.

3. A bridge deck continuous cross - joint slab structure according to claim 1, Characterized in that: The cross - joint slab is formed by in - situ casting or factory pre - casting.

4. A construction method of a bridge deck continuous cross - joint slab structure, Characterized in that: It includes using the bridge deck continuous cross - joint slab structure as described in any one of claims 1 - 3. The construction method comprises the following steps: (1) For the renovation of existing bridges: Step 101: According to the design requirements, chisel the concrete inside the reserved notch of the expansion joint at the beam ends of the main girders on both sides of the original bridge deck, and chisel the height of the reserved notch of the expansion joint to the elevation required by the design; Step 102: Using drilling equipment, drill embedded bolt holes at the bottom of the reserved notch of the expansion joint according to the layout of the connecting holes on the π - shaped steel plate. Install embedded bolts in the embedded bolt holes, and then pour a concrete leveling cushion layer at the bottom of the reserved notch of the expansion joint; Step 103: Lay a sliding layer on the concrete leveling cushion layer, and lock and fix the π - shaped steel plate with the embedded bolts through nuts to realize the fixed connection between the π - shaped steel plate and the main girder; Step 104: Weld the stress - bearing steel bars with the vertical steel plate at the inner end of the π - shaped steel plate, and tie longitudinal steel bars on the stress - bearing steel bars. The stress - bearing steel bars and the longitudinal steel bars form a steel reinforcement cage; Step 105: Pour concrete above the steel reinforcement cage and the embedded bolts; Step 106: After the concrete poured in Step 105 reaches the design strength, construct the bridge deck pavement layer; (2) For newly built bridges: Step 201: According to the design requirements, when constructing the beam ends on both sides of the bridge deck, install the embedded bolts according to the layout of the connection holes on the π-shaped steel plate; Step 202: After the construction of the main beams on both sides of the bridge deck is completed, pour a concrete leveling cushion at the bottom of the expansion joint reserved groove at the beam ends of the main beams and reach the strength requirements; Step 203: Lay a sliding layer on the concrete leveling cushion, and lock and fix the π-shaped steel plate and the embedded bolts with nuts to realize the fixed connection between the π-shaped steel plate and the main beam; Step 204: Weld and fix the stress-bearing steel bars to the vertical steel plate at the inner end of the π-shaped steel plate, tie longitudinal steel bars on the stress-bearing steel bars, and the stress-bearing steel bars and the longitudinal steel bars form a steel reinforcement cage; Step 205: Pour concrete on the upper sides of the steel reinforcement cage and the embedded bolts; Step 206: After the concrete poured in Step 205 reaches the design strength, construct the bridge deck pavement layer.

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