Assembled hollow slab bridge and construction method thereof

Abstract

The present invention relates to the technical field of bridge construction, and discloses an assembled hollow slab bridge and a construction method thereof. An inter-slab connecting device is used to connect all hollow slabs transversely into a whole. Due to the provision of a middle cantilever, the top surface of the middle cantilever and the top surface of the hollow slab together constitute a plane structure for the paving of the bridge deck structure, and serve as the bottom formwork for the cast-in-place layer of the bridge deck structure. Subsequently, a guardrail structure is cast on-site on the top of the side cantilever beam, and the bridge deck structure is cast on-site using the plane structure and the guardrail structure as templates, which facilitates the construction of the bridge deck and strengthens the connection between the guardrail and the bridge structure. A middle cantilever beam is provided in the upper half between adjacent hollow slabs, and an inter-slab connecting device is provided in the lower half, thereby avoiding the hinge joint disease existing in conventional hollow slabs; due to the inter-slab connecting device provided in the lower half between the slabs, and the joint effect of the wall structure cast on-site on the plane structure, the transverse integrity and durability of the bridge slab are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to an assembled hollow slab bridge and a construction method thereof. Background Art

[0002] Small and medium-span bridges account for a large proportion of highways and municipal roads. The "Statistical Bulletin on the Development of the Transportation Industry" shows that in the national highway network, the number of small and medium-span bridges accounts for 85.2%. Among urban bridges, a large number of viaducts are also composed of small and medium-span bridges. Therefore, small and medium-span bridge structures occupy an important position. From the application and research of domestic bridges, it is found that among existing bridges, prestressed hollow slabs have an application proportion of 65% to 70% due to their simple structure, convenient construction, strong adaptability and good economy. However, when designing hollow slabs, economic indicators are excessively pursued, structural details and their own resistance reserves are ignored, resulting in poor structural durability and common defects after 5 to 10 years of service.

[0003] Furthermore, with China's economic development, the mileage of new and existing highways, municipal roads, and bridges in my country are failing to meet the demands of growing traffic. When existing bridges are unable to meet traffic growth, demolition and reconstruction are excessively wasteful. Widening and renovating existing bridges is economically and technically feasible. Industry standards recommend widening and renovating bridges using a single structure, which poses safety risks when widening hollow slab bridges, which account for a significant portion of the bridge.

[0004] Therefore, it is necessary to invent a small to medium span bridge that is easy to construct, has good integrity, and is durable. This bridge can not only meet the actual needs of a large number of projects, but can also better adapt to the widening and renovation of existing hollow slab bridges. This application aims to provide an assembled hollow slab bridge, which is optimized based on the existing general drawings issued by the ministry. A beam connecting steel structure device is set between the slabs to enhance the overall lateral performance. The guardrail is cast in place to strengthen the connection with the structure. A cast-in-place concrete layer is provided to further strengthen the lateral connection of the structure. The connecting steel bars of the hollow slab and the cast-in-place layer are optimized to improve the connection performance. Summary of the Invention

[0005] In view of the above-mentioned defects in the prior art, an assembled hollow slab bridge and a construction method thereof are provided, which have the characteristics of convenient construction, good integrity and strong durability.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A prefabricated hollow slab bridge comprises a plurality of hollow slabs arranged along the length direction of the bridge, and is characterized in that: a certain distance is set between the hollow slabs; a middle cantilever is fixedly provided on the upper half of the side surface between two adjacent hollow slabs, and a side cantilever is provided on the upper part of the side surface of the two outermost hollow slabs, the side surfaces of the middle cantilevers of the two adjacent hollow slabs fit together, and the top surfaces of the hollow slabs, the middle cantilever and the side cantilever together constitute a plane structure; a plurality of inter-plate connecting devices are spaced between the side surfaces of the area below the height of the middle cantilever at the edge of the hollow slab, and the two ends of the inter-plate connecting devices are respectively connected to the two adjacent hollow slabs; guardrail structure and bridge deck structure embedded steel bars are provided on the top of the side cantilever and the said plane structure, and a guardrail structure is provided on the top of the side cantilever, and the bridge deck structure is cast on site on the said plane structure and between the guardrail structures.

[0008] According to the above technical solution, a guardrail structure arranged on the cantilever beam of the outermost hollow slab is reduced, and a certain distance is set between the old bridge side beam and the hollow slab; connecting steel bars are embedded in the side surface of the outermost hollow slab, and connecting steel bars are embedded on the side surface of the old bridge side beam adjacent to the outermost hollow slab, and the outermost hollow slab and the old bridge side beam are cast as a whole.

[0009] According to the above technical solution, the inter-plate connecting device includes an embedded part and a connecting part. The embedded part is set on the side surfaces of two adjacent hollow plates, and the embedded parts are connected into a whole through the connecting part.

[0010] According to the above technical solution, the embedded part includes shear bolts and embedded steel plates. A plurality of shear bolts are set in both sides of adjacent hollow plates, and the shear bolts are perpendicular to the sides of the hollow plates. The embedded steel plates are placed in the sides of the hollow plates, with one side of the embedded steel plates flush with the sides of the hollow plates, and the other side of the embedded steel plates is fixedly connected to the shear bolts.

[0011] The connecting part includes two shear steel plates, two connecting steel plates, and several connecting bolts. The two shear steel plates are arranged vertically and flush, the width of the shear steel plates is consistent with the width of the center suspension beam, one side of the two shear steel plates is fixed on the embedded steel plates, and the other sides of the two shear steel plates are fitted together; the two connecting steel plates are arranged on the front and rear sides of the fitting of the two shear steel plates, and a group of bolt holes are respectively provided on the two shear steel plates, and bolt holes matching the bolt holes of the shear steel plates are provided on the connecting steel plates. The shear steel plates on both sides and the connecting steel plates on the front and back sides of the shear steel plates are connected into a whole by connecting bolts.

[0012] According to the above technical solution, the embedded steel bars include embedded longitudinal bars located in the side cantilever beams and the outermost hollow slabs and arranged along the length direction of the hollow slabs, vertical bars tied to the embedded longitudinal bars at the bottom and arranged vertically to protrude from the plane structure, and shear steel bars arranged in a rectangular array on the top of the middle cantilever beams and the hollow slabs; the shear steel bars adopt an approximately U-shaped structure to form several ring structures on the top of the plane structure.

[0013] According to the above technical solution, a number of guardrail longitudinal reinforcements are spaced on both sides of the plane structure and within the range of guardrail construction, and the guardrail is constructed; a number of cast-in-place longitudinal steel bars and a number of cast-in-place transverse steel bars are set in the plane structure between the guardrails, and the cast-in-place longitudinal steel bars pass through the annular structure and are arranged vertically along the length direction of the hollow slab; the cast-in-place transverse steel bars are arranged in the same manner as the central steel bars of the cast-in-place layer, and the cast-in-place layer is arranged with the cast-in-place longitudinal steel bars and transverse steel bars as the skeleton and the plane structure and guardrail structure as the template, and a pavement layer is laid on top of the cast-in-place layer to form a bridge deck structure.

[0014] A construction method for an assembled hollow slab bridge, characterized by comprising the following steps:

[0015] S1: Production of hollow slabs, cantilever beams, and embedded parts;

[0016] S2: Hoist the hollow slab and use the inter-slab connection device to connect the hollow slab side beams and hollow slab middle beams horizontally into a whole;

[0017] S3: roughening the planar structure to form an uneven bonding layer;

[0018] S4: Construction of anti-collision guardrails located on the side cantilever beams and hollow slab edge beams;

[0019] S5: Cast-in-place construction of the bridge deck structure using the plane structure and crash barrier.

[0020] According to the above technical solution, in step S2, if a new bridge is to be built, the hollow slab side beams and the hollow slab middle beams are connected and constructed through the inter-slab connection device according to the design drawings; if an existing bridge is to be widened, connecting steel bars are buried on the outer side surface of the outermost hollow slab middle beam, and connecting steel bars are implanted on the side surface of the existing bridge side beams, and the connecting steel bars are used as a link to cast the new and old wall beams into a whole.

[0021] According to the above technical solution, in step S1, the following steps are included:

[0022] S11: Determine the number of hollow slabs and the length of the side and middle cantilevers;

[0023] S12: Determine the size and quantity of each component of the inter-plate connection structure, as well as the relative positions of each component;

[0024] S13: Tie the hollow slab reinforcement structure, and connect the embedded parts of the inter-slab connection structure, as well as the embedded reinforcement parts of the guardrail structure and the bridge deck structure to the hollow slab reinforcement structure;

[0025] S14: Cast hollow slabs, side cantilever beams and center cantilever beams according to the design drawings.

[0026] The present invention has the following beneficial effects:

[0027] 1. Adjustments and optimizations are made based on the general drawings issued by the ministry, leaving a certain distance between the hollow slabs. Inter-slab connection devices are set on the lower half of the side surfaces of the hollow slabs on both sides of the gap; during on-site construction, all hollow slabs are horizontally connected into a whole using the inter-slab connection devices. At this time, since the middle cantilever is set on the upper half of the side surfaces of the hollow slabs on both sides of the gap, the top surface of the middle cantilever and the top surface of the hollow slab together constitute the plane structure of the bridge deck structure pavement, and serve as the bottom formwork of the cast-in-place layer of the bridge deck structure. Subsequently, the guardrail structure is cast on-site on the top of the side cantilever beam, and the bridge deck structure is cast on-site using the said plane structure and guardrail structure as templates, which facilitates the construction of the bridge deck and strengthens the connection between the guardrail and the bridge structure.

[0028] Based on the above measures, the hollow slabs, side cantilever beams, heavy cantilever beams, parts of the inter-slab connection structure, and embedded steel bars are prefabricated together, and the hollow slabs are laterally connected to form a whole on site through inter-slab connection devices, thereby improving the efficiency of bridge construction. In addition, a central cantilever beam is set in the upper half of the space between adjacent hollow slabs, and an inter-slab connection device is set in the lower half, thereby avoiding the hinge joint disease existing in conventional hollow slabs. In addition, due to the inter-slab connection device set in the lower half of the space between the slabs and the combined effect of the wall structure cast on site on the plane structure, the transverse integrity and durability of the bridge slab are improved.

[0029] This structure is well compatible with the hollow slabs in the general drawings issued by the ministry. It can be used as a new structure and can also be used to widen and renovate bridges that only have hollow slabs.

[0030] 2. Pre-embedded shear reinforcement bars in the plane structure enhance the integrity between the bridge deck structure and the hollow slab, thereby improving the durability of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of an embodiment provided by the present invention;

[0032] Figure 2 This is a diagram of connecting steel bars for an assembled hollow slab according to an embodiment of the present invention;

[0033] Figure 3 This is a diagram showing the connection relationship between two adjacent hollow plates and the inter-plate connection structure according to an embodiment of the present invention;

[0034] Figure 4This is a cross-sectional view of the hollow slab interval along the length direction of the bridge according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure between the inter-plate connection structure and the hollow plate provided in an embodiment of the present invention;

[0036] In the figure, 1. Hollow slab; 2. Middle cantilever; 3. Side cantilever; 4. Inter-slab connection device; 4-1. Shear bolt; 4-2. Embedded steel plate; 4-3. Shear steel plate; 4-4. Connecting steel plate; 4-5. Connecting bolt; 5. Guardrail structure; 5-1. Embedded longitudinal reinforcement; 5-2. Vertical reinforcement; 5-3. Guardrail longitudinal reinforcement; 6. Bridge deck structure; 6-1. Shear reinforcement; 6-2. Longitudinal reinforcement of cast-in-place layer; 6-3. Transverse reinforcement of cast-in-place layer; 6-4. Cast-in-place layer; 6-5. Pavement layer; 6-6. Bonding layer. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] Reference Figures 1 to 5 As shown, the present invention provides an assembled hollow slab bridge.

[0039] Example 1

[0040] It includes several hollow slabs 1 arranged along the length of the bridge, and there is a certain distance between the hollow slabs; a middle cantilever 2 is fixedly provided on the upper half of the side surface between two adjacent hollow slabs, and a side cantilever 3 is provided on the upper part of the side surface of the two outermost hollow slabs. The side surfaces of the middle cantilevers of the two adjacent hollow slabs are fitted together, and the top surfaces of the hollow slabs, the middle cantilevers and the side cantilevers together constitute a plane structure; several inter-plate connecting devices 4 are spaced between the side surfaces of the area below the height of the middle cantilever on the side of the hollow slab, and the two ends of the inter-plate connecting devices are respectively connected to the two adjacent hollow slabs; guardrail structure and bridge deck structure embedded steel bars are provided on the top of the side cantilever and the said plane structure, and a guardrail structure 5 is provided on the top of the side cantilever, and the bridge deck structure 6 is cast on site on the said plane structure and between the guardrail structures.

[0041] In the embodiment, adjustments and optimizations are made based on the general drawings issued by the ministry, and a certain distance is left between the hollow slabs. Inter-slab connection devices are set on the lower half of the side surfaces of the hollow slabs on both sides of the distance; during on-site construction, the inter-slab connection devices are used to connect all the hollow slabs horizontally into a whole. At this time, since the middle cantilever is set on the upper half of the side surfaces of the hollow slabs on both sides of the gap, the top surface of the middle cantilever and the top surface of the hollow slab together constitute the plane structure of the bridge deck structure pavement and serve as the bottom formwork for the cast-in-place layer of the bridge deck structure. Subsequently, a guardrail structure is cast on-site on top of the side cantilever beam, and the bridge deck structure is cast on-site using the said plane structure and guardrail structure as a template, which facilitates the construction of the bridge deck and strengthens the connection between the guardrail and the bridge structure.

[0042] Based on the above measures, the hollow slabs, side cantilever beams, heavy cantilever beams, parts of the inter-slab connection structure, and embedded steel bars are prefabricated together, and the hollow slabs are laterally connected to form a whole on site through inter-slab connection devices, thereby improving the efficiency of bridge construction. In addition, a central cantilever beam is set in the upper half of the space between adjacent hollow slabs, and an inter-slab connection device is set in the lower half, thereby avoiding the hinge joint disease existing in conventional hollow slabs. In addition, due to the inter-slab connection device set in the lower half of the space between the slabs and the combined effect of the wall structure cast on site on the plane structure, the transverse integrity and durability of the bridge slab are improved.

[0043] This structure is well compatible with the hollow slabs in the general drawings issued by the ministry. It can be used as a new structure and can also be used to widen and renovate bridges that only have hollow slabs.

[0044] Example 2

[0045] The structure and principle of Example 2 are similar to those of Example 1, except that adaptive modifications are made on the basis of Example 1 in order to adapt to the widening of the existing bridge structure.

[0046] Specifically, a guardrail structure arranged on the cantilever beam of the outermost hollow slab is reduced, and a certain distance is set between the old bridge side beam and the hollow slab; connecting steel bars are pre-embedded in the side surface of the outermost hollow slab, and connecting steel bars are pre-embedded on the side surface of the old bridge side beam adjacent to the outermost hollow slab, and the outermost hollow slab and the old bridge side beam are cast as a whole.

[0047] On the basis of this embodiment 1, a guardrail structure arranged on the side cantilever beam of the outermost hollow slab is reduced, and a gap is left between the outermost hollow slab and the side beam of the old bridge; the side cantilever beam is used as a construction operation space to set connecting steel bars, and the connecting steel bars arranged on the outermost hollow slab and the side beam of the old bridge are used to cast the hollow slab and the side beam of the old bridge as a whole, thereby completing the widening and reconstruction of the existing bridge.

[0048] Example 3

[0049] The structure and principle of Example 3 are similar to those of Examples 1 and 2, except that a preferred implementation form of the inter-board connection structure is provided.

[0050] Specifically, the inter-plate connecting device includes a pre-embedded part and a connecting part. The pre-embedded part is provided on the side surfaces of two adjacent hollow plates, and the pre-embedded parts are connected into a whole through the connecting part.

[0051] In this embodiment, the embedded parts are connected into a whole through the connecting parts, thereby indirectly connecting two adjacent hollow slabs, or the outermost hollow slab and the old bridge side beam into a whole, thereby improving the construction efficiency and lateral integrity of the bridge body, and achieving the purpose of improving the maintenance convenience and durability of the bridge body.

[0052] Example 4

[0053] The structure and principle of Example 4 are similar to those of Examples 1 and 2, except that a specific structure of a preferred inter-plate connection structure is provided.

[0054] The embedded part includes shear bolts 4-1 and embedded steel plates 4-2. A plurality of shear bolts 1 are set in both sides of adjacent hollow plates. The shear bolts are perpendicular to the sides of the hollow plates. The embedded steel plates are placed in the sides of the hollow plates. One side of the embedded steel plates is flush with the side of the hollow plates. The other side of the embedded steel plates is fixedly connected to the shear bolts.

[0055] The connecting part includes two shear steel plates 4-3, two connecting steel plates 4-4, and several connecting bolts 4-5. The two shear steel plates are arranged vertically and flush, the width of the shear steel plates is consistent with the width of the center suspension beam, one side of the two shear steel plates is fixed on the embedded steel plates, and the other sides of the two shear steel plates are fitted together; the two connecting steel plates are arranged on the front and rear sides of the fitting of the two shear steel plates, and a group of bolt holes are respectively provided on the two shear steel plates, and bolt holes matching the bolt holes of the shear steel plates are provided on the connecting steel plates. The shear steel plates on both sides and the connecting steel plates on the front and back sides of the shear steel plates are connected into a whole by connecting bolts.

[0056] In this embodiment, the inter-plate connection structure is provided with two shear steel plates fixed on one side to the embedded steel plate and in contact with the other side. By aligning the shear steel plates, the installation difficulty between two adjacent hollow slab main beams and hollow slab side beams, or between two hollow slab main beams, is reduced, and the installation process of the inter-plate connection structure is simplified.

[0057] Example 5

[0058] The structure and principle of Example 5 are similar to those of Examples 1 and 2, except that a preferred structural form of the embedded steel bar is provided.

[0059] Specifically, the embedded steel bars include embedded longitudinal bars 5-1 located in the side cantilever beams and the outermost hollow slabs and arranged along the length direction of the hollow slabs, vertical steel bars 5-2 tied to the embedded longitudinal bars at the bottom and arranged vertically to protrude from the plane structure, and shear steel bars 6-1 arranged in a rectangular array on the top of the middle cantilever beams and the hollow slabs; the shear steel bars adopt an approximately U-shaped structure, forming several ring structures on the top of the plane structure.

[0060] The purpose of setting up shear reinforcement is to strengthen the connection between the cast-in-place layer of the bridge deck structure and the plane structure; in addition, pre-embedded guardrail reinforcement and pre-embedded longitudinal reinforcement in the side cantilever and overlapping them can effectively transfer the load.

[0061] Example 6

[0062] The structure and principle of Example 6 are similar to those of Example 5, except that a preferred structural form of the bridge deck structure is provided.

[0063] Specifically, a number of guardrail longitudinal bars 5-3 are spaced on both sides of the plane structure and within the range of guardrail construction, and the guardrail is constructed; a number of cast-in-place longitudinal steel bars 6-2 and a number of cast-in-place transverse steel bars 6-3 are set in the plane structure between the guardrails, and the cast-in-place longitudinal steel bars pass through the annular structure and are arranged vertically along the length direction of the hollow slab; the cast-in-place transverse steel bars are arranged in the same manner as the cast-in-place central steel bars, and the cast-in-place layer 6-4 is arranged with the cast-in-place longitudinal steel bars and transverse steel bars as the skeleton and the plane structure and guardrail structure as the template, and a pavement layer 6-5 is laid on top of the cast-in-place layer to form a bridge deck structure.

[0064] In addition, the present invention also provides a construction method for an assembled hollow slab bridge.

[0065] Example 1

[0066] The steps include:

[0067] S1: Production of hollow slabs, cantilever beams, and embedded parts;

[0068] S2: Hoist the hollow slabs and use the inter-slab connection device to connect the hollow slab side beams and the hollow slab middle beams transversely into a whole; specifically, by connecting the steel plates and connecting bolts, connect the embedded steel plates located in the side surfaces of two adjacent hollow slabs into a whole, thereby connecting all the hollow slabs into a whole.

[0069] S3: roughening the planar structure to form an uneven bonding layer 6-6; so as to enhance the connection performance with the cast-in-place layer; and protecting the exposed steel bars during the roughening process;

[0070] S4: Construct the anti-collision guardrail located on the side cantilever beam and the hollow slab side beam, pour the guardrail concrete and maintain it; specifically, tie the guardrail longitudinal reinforcement on the guardrail steel bar, and set the guardrail structure mold at the preset position of the guardrail structure of the plane structure.

[0071] S5: The bridge deck structure is cast in-situ using the planar structure and crash barrier. The cast-in-situ concrete layer is poured and cured. Specifically, the longitudinal and transverse reinforcement of the cast-in-situ layer are tied, ensuring that the longitudinal reinforcement passes through the pre-installed shear reinforcement in the hollow slab to strengthen the connection. The cast-in-situ layer is then poured using the guardrail structure and the planar structure as a template. Once the concrete meets the specifications and design requirements, the waterproofing layer and pavement layer are constructed, completing the main bridge construction. Traffic is opened after the remaining ancillary structures are completed.

[0072] Example 2

[0073] The steps of Example 2 are similar to those of Example 1, except that a specific method of Step 2 is provided based on different usage scenarios of the hollow skipping machine provided by the present invention.

[0074] In step S2, if a new bridge is to be built, the hollow slab side beams and the hollow slab middle beams are connected and constructed through the inter-slab connection device according to the design drawings; if an existing bridge is to be widened, connecting steel bars are buried on the outer side of the outermost hollow slab middle beam, and connecting steel bars are embedded on the side of the existing bridge side beams. The connecting steel bars are used as a link to cast the new and old wall beams into a whole.

[0075] Example 3

[0076] The steps of Example 3 are similar to those of Example 1, except that a preferred method for manufacturing hollow slabs, cantilever beams, and embedded parts is provided.

[0077] In step S1, the following steps are included:

[0078] S11: Based on the width of the bridge and the general drawings issued by the ministry, conduct stress analysis and adjustment optimization to determine the number of hollow slabs and the length of the side and middle cantilevers. The length of the side cantilever needs to take into account the role of the anti-collision guardrail. The root height can be larger than the middle cantilever, and the length of the side cantilever should be controlled to ensure structural safety.

[0079] S12: Determine the size and quantity of each component of the inter-plate connection structure, as well as the relative position of each component; specifically, determine the width of the shear steel plate based on the calculated cantilever length; determine the longitudinal number, height, and thickness of the shear steel plates, and the length and number of shear bolts based on the overall layout of the bridge and the hollow slab settings through overall calculation.

[0080] S13: Tie the hollow slab reinforcement structure to connect the embedded parts of the inter-slab connection structure, as well as the embedded reinforcement parts of the guardrail structure and the bridge deck structure to the hollow slab reinforcement structure; specifically, including the embedded bolts and embedded reinforcement of the inter-slab connection structure, the embedded longitudinal reinforcement and guardrail reinforcement of the guardrail structure, and the shear reinforcement of the bridge deck structure. The above embedded parts are connected to the reinforcement inside the hollow slab into a whole.

[0081] S14: Cast the hollow slab, side cantilever beams and center cantilever beams according to the design drawings, and carry out maintenance to complete the beam construction.

[0082] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope of protection of the present invention.

Claims

1. An assembled hollow slab bridge comprising a plurality of hollow slabs arranged along the length of the bridge, characterized in that: A certain distance is set between the hollow slabs; a middle cantilever is fixedly provided on the upper half of the side surface between two adjacent hollow slabs, and a side cantilever is provided on the upper part of the side surface of the two outermost hollow slabs. The side surfaces of the middle cantilevers of the two adjacent hollow slabs fit together, and the top surfaces of the hollow slabs, the middle cantilever and the side cantilever together form a plane structure; a plurality of inter-plate connecting devices are provided at intervals between the side surfaces of the hollow slabs below the height of the middle cantilever, and the two ends of the inter-plate connecting devices are respectively connected to the inside of the two adjacent hollow slabs; a guardrail structure and a bridge deck structure are provided with embedded steel bars on the top of the side cantilever and the plane structure, a guardrail structure is provided on the top of the side cantilever, and the bridge deck structure is cast on site on the plane structure and between the guardrail structures; The inter-plate connecting device includes a pre-embedded part and a connecting part. The pre-embedded part is set on the side of two adjacent hollow plates, and the pre-embedded parts are connected into a whole through the connecting part. The embedded part includes shear bolts and embedded steel plates. A plurality of shear bolts are set in both sides of adjacent hollow slabs. The shear bolts are perpendicular to the sides of the hollow slabs. The embedded steel plates are placed in the sides of the hollow slabs. One side of the embedded steel plates is flush with the side of the hollow slabs. The other side of the embedded steel plates is fixedly connected to the shear bolts. The connecting part includes two shear steel plates, two connecting steel plates, and several connecting bolts. The two shear steel plates are arranged vertically and flush, the width of the shear steel plates is consistent with the width of the center suspension beam, one side of the two shear steel plates is fixed on the embedded steel plates, and the other sides of the two shear steel plates are fitted together; the two connecting steel plates are arranged on the front and rear sides of the fitting of the two shear steel plates, and a group of bolt holes are respectively provided on the two shear steel plates, and bolt holes matching the bolt holes of the shear steel plates are provided on the connecting steel plates. The shear steel plates on both sides and the connecting steel plates on the front and back sides of the shear steel plates are connected into a whole by connecting bolts.

2. The assembled hollow slab bridge according to claim 1, characterized in that: A guardrail structure arranged on the cantilever beam of the outermost hollow slab is reduced, and a certain distance is set between the old bridge side beam and the hollow slab; connecting steel bars are pre-embedded in the side surface of the outermost hollow slab, and connecting steel bars are pre-embedded on the side surface of the old bridge side beam adjacent to the outermost hollow slab, and the outermost hollow slab and the old bridge side beam are cast as a whole.

3. The assembled hollow slab bridge according to claim 1, characterized in that: The embedded steel bars include embedded longitudinal bars located in the side cantilever beams and the outermost hollow slabs and arranged along the length direction of the hollow slabs, vertical bars tied to the embedded longitudinal bars at the bottom and arranged vertically to protrude from the plane structure, and shear bars arranged in a rectangular array on the top of the middle cantilever beams and the hollow slabs; the shear bars adopt an approximately U-shaped structure, forming several ring structures on the top of the plane structure.

4. The assembled hollow slab bridge according to claim 3, characterized in that: A number of guardrail longitudinal reinforcements are spaced on both sides of the plane structure and within the range of guardrail construction, and the guardrail is constructed; a number of cast-in-place longitudinal reinforcements and a number of cast-in-place transverse reinforcements are set in the plane structure between the guardrails, the cast-in-place longitudinal reinforcements pass through the annular structure, and are arranged vertically along the length direction of the hollow slab; the cast-in-place transverse reinforcements are arranged in the same manner as the cast-in-place central reinforcements, and the cast-in-place layer longitudinal reinforcements and transverse reinforcements are used as a skeleton, and the plane structure and guardrail structure are used as a template to arrange the cast-in-place layer, and a pavement layer is laid on top of the cast-in-place layer to form a bridge deck structure.

5. A construction method for an assembled hollow slab bridge, characterized by: The assembled hollow slab bridge according to claim 1 comprises the following steps: S1: Production of hollow slabs, cantilever beams, and embedded parts; S2: Hoist the hollow slab and use the inter-slab connection device to connect the hollow slab side beams and hollow slab middle beams horizontally into a whole; S3: roughening the planar structure to form an uneven bonding layer; S4: Construction of anti-collision guardrails located on the side cantilever beams and hollow slab edge beams; S5: Cast-in-place construction of the bridge deck structure using the plane structure and crash barrier.

6. The construction method of the assembled hollow slab bridge according to claim 5, characterized in that: In step S2, if a new bridge is to be built, the hollow slab side beams and the hollow slab middle beams are connected and constructed through the inter-slab connection device according to the design drawings; if an existing bridge is to be widened, connecting steel bars are buried on the outer side of the outermost hollow slab middle beam, and connecting steel bars are embedded on the side of the existing bridge side beams. The connecting steel bars are used as a link to cast the new and old wall beams into a whole.

7. The construction method of the assembled hollow slab bridge according to claim 5, characterized in that: In step S1, the following steps are included: S11: Determine the number of hollow slabs and the length of the side and middle cantilevers; S12: Determine the size and quantity of each component of the inter-plate connection structure, as well as the relative positions of each component; S13: Tie the hollow slab reinforcement structure, and connect the embedded parts of the inter-slab connection structure, as well as the embedded reinforcement parts of the guardrail structure and the bridge deck structure to the hollow slab reinforcement structure; S14: Cast hollow slabs, side cantilever beams and center cantilever beams according to the design drawings.

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