Continuous structure and construction method of simply supported beam bridge deck

Abstract

The present invention relates to the technical field of bridge construction, and in particular to a continuous structure of a simply supported beam bridge deck and a construction method thereof, wherein the continuous structure of the simply supported beam bridge deck comprises a main beam and a bridge deck pavement layer, an expansion joint is left between two adjacent sections of the main beam, and precast grooves are provided on the end faces of the two sections of the main beam that are close to each other, the precast grooves enclose forming a filling area, the width of the filling area gradually increases from bottom to top, and the filling area is filled with concrete to form a connecting block; the bridge deck pavement layer comprises a bridge deck and a bridge deck connecting plate, the bridge deck is symmetrically arranged relative to the span line and connected to the top surface of the main beam, the bridge deck connecting plate is located between the two sections of the bridge deck and is connected to the bridge deck as a whole, and there is a gap between the bridge deck connecting plate and the connecting block. The above-mentioned continuous structure of the simply supported beam bridge deck separates the bridge deck connecting plate from the main beam, and provides a filling area filled with concrete on the main beam, which can reduce the stiffness of the bridge deck connection part and delay structural cracking.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a continuous structure of a simply supported beam bridge deck and a construction method thereof. Background Art

[0002] Small and medium-span bridges can be divided into simply supported beam bridges and continuous beam bridges based on their structural characteristics and load patterns. Simply supported beam bridges are statically determinate structures with well-defined load patterns, but they can deform under temperature loads and support settlement. Therefore, expansion joints are often used in multi-span simply supported bridges. However, their use significantly reduces the continuity of the bridge deck, impacting driving safety and comfort. Continuous bridges, on the other hand, are typically constructed with multiple spans in a single unit. While the main beam structure exhibits high rigidity and low deformation, continuous beams are statically indeterminate. Factors such as temperature, support settlement, and prestressing can cause variations in internal forces, making their design difficult and requiring complex construction processes.

[0003] For this purpose, simply supported continuous beam bridges came into being. Simply supported continuous beam bridges combine the advantages of both simply supported beam bridges and continuous beam bridges, and use bridge deck connecting plates to replace expansion joint devices, thereby enhancing the integrity and continuity of the bridge deck, improving driving comfort and safety, and improving the phenomenon of vehicle jumping at the bridge head.

[0004] However, the simply supported continuous beam bridge adopts a full-section continuous structure and is essentially a continuous beam bridge with large section stiffness and negative bending moment. The bridge deck connecting plates are located at both ends of the main beam and are the part with the largest deformation of the main beam. The deformation of the main beam will generate large and complex internal forces such as tension, compression, and bending in the bridge deck connecting plates that constrain the deformation, resulting in cracks, which seriously threatens the safety and durability of the entire bridge structure and also puts higher demands on future maintenance work. Summary of the Invention

[0005] The purpose of the present invention is to provide a continuous structure of the bridge deck of a simply supported beam bridge, which can increase the deformation capacity of the bridge deck connecting plate and reduce cracking.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The continuous structure of the deck of a simply supported beam bridge includes a main beam and a bridge deck pavement layer, an expansion joint is left between two adjacent sections of the main beam, and a precast groove is provided on the end faces of the two sections of the main beam that are close to each other, the precast grooves enclose a filling area, the width of the filling area gradually increases from bottom to top, and the filling area is filled with concrete to form a connecting block; the bridge deck pavement layer includes a bridge deck and a bridge deck connecting plate, the bridge deck is arranged symmetrically with respect to the sub-span line and is connected to the top surface of the main beam, the bridge deck connecting plate is located between the two sections of the bridge deck and is connected to the bridge deck as a whole, and there is a gap between the bridge deck connecting plate and the connecting block.

[0008] Optionally, a steel mesh is provided in the bridge deck pavement layer.

[0009] Optionally, a first connecting steel bar is provided in the bridge deck, and a second connecting steel bar is provided in the bridge deck connecting plate, and the first connecting steel bar extends into the bridge deck connecting plate and is connected to the second connecting steel bar.

[0010] Optionally, welding nails are provided on the top surface of the main beam, and the welding nails penetrate into the interior of the bridge deck pavement layer.

[0011] Optionally, the filling area is partially provided with welding nails, and the welding nails are connected to the main beam.

[0012] Optionally, the connection block extends to both sides of the branch span to connect with the bridge deck.

[0013] Optionally, an isolation layer is provided between the connection block and the bridge deck connection plate.

[0014] Another object of the present invention is to provide a construction method for a continuous bridge deck structure of a simply supported beam bridge, which is used for the construction of the continuous bridge deck structure of the simply supported beam bridge, and specifically comprises the following steps:

[0015] Hoisting the main beam onto the support and fixing it, forming the expansion joint between the two main beams;

[0016] Performing a first pouring of concrete to form the bridge deck and the connecting blocks;

[0017] After the first poured concrete is cured and solidified, a second pouring of concrete is carried out to form the bridge deck connection plate.

[0018] Optionally, before the first pouring of concrete, a steel mesh is tied at the bridge deck so that the steel mesh is provided inside the bridge deck; before the second pouring of concrete, a steel mesh is tied at the bridge deck connecting plate so that the steel mesh is provided inside the bridge deck connecting plate.

[0019] Optionally, when casting the bridge deck connection plate, an isolation layer is provided above the connection block.

[0020] The beneficial effects of the present invention are as follows: the present invention separates the bridge deck connection plate from the main beam, which can not only reduce the structural stiffness of the bridge deck connection, enhance the structural deformation capacity and thus reduce the possibility of cracking of the bridge deck connection plate, but also cause no damage to the main beam when replacing the bridge deck connection plate, thereby increasing the service life of the main beam; at the same time, a filling area that gradually widens from bottom to top is provided between the two main beams, and the filling area is filled with concrete to form a connecting block, which can connect the two sections of the main beam, reduce the effective height of the main beam cross section, and thus further reduce the stiffness of the connection part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 12 is a schematic structural diagram of a continuous bridge deck structure of a simply supported beam bridge proposed in an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle.

[0023] In the figure, 1. Main beam; 2. Bridge deck; 3. Bridge deck connecting plate; 4. Steel mesh; 5. Welding nails; 6. Connecting block; 7. Support; 8. Pier. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0025] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., referring to positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0028] This embodiment proposes a continuous deck structure for a simply supported continuous beam bridge based on the continuous deck structure of the current simply supported continuous beam bridge and the stress characteristics of the connecting plates. On the basis of the traditional continuous deck structure, the concrete bridge deck is layered and cast in steps.

[0029] refer to Figure 1-2 As shown, the continuous structure of the simply supported beam bridge deck in this embodiment is installed on the supporting system of the simply supported beam bridge, and the supporting system includes piers 8 and supports 7. The piers 8 are gravity piers, and the supports 7 are plate-type rubber supports. The plate-type rubber supports can reliably transmit the reaction force of the superstructure to the piers 8 and can also simultaneously complete the required deformation of the beam structure; the continuous structure of the simply supported beam bridge deck includes a main beam 1 and a bridge deck pavement layer, wherein the bridge deck pavement layer includes a bridge deck 2 and a bridge deck connecting plate 3. The main beam 1 is symmetrically arranged relative to the pier 8. An expansion joint is provided between two adjacent main beams 1, and a precast groove is provided on the end face of the two main beams 1 close to each other. The precast groove encloses a filling area located above the expansion joint. The width of the filling area gradually increases from bottom to top. The filling area is filled with concrete, and the concrete solidifies to form a connecting block 6. The bridge deck 2 is also arranged symmetrically with respect to the span line and is connected to the top surface of the main beam 1. The bridge deck connecting plate 3 is located between the two bridge decks 2 and is connected to the bridge deck 2 as a whole. There is a certain gap between the bridge deck connecting plate 3 and the connecting block 6.

[0030] The continuous structure of the bridge deck of the simply supported beam bridge sets a certain gap between the bridge deck connecting plate 3 and the main beam 1, which reduces the bending stiffness of the bridge deck connecting plate 3 and increases the deformation capacity of the bridge deck connecting plate 3, thereby reducing the possibility of damage to the bridge deck connecting plate 3. Even if the bridge deck connecting plate 3 is damaged and needs to be replaced, it will not damage the main beam 1 when it is chiseled open. At the same time, a filling area is provided at one end of the main beams 1 that are close to each other. The concrete filled in the filling area can be connected to the main beams 1 at both ends and bear the connection force, reducing the effective height of the cross section of the main beam 1, thereby reducing the stiffness of the connection part and further delaying structural cracking.

[0031] In order to prevent the concrete constituting the bridge deck connecting plate 3 from contacting the connecting block 6 when pouring the bridge deck connecting plate 3, an isolation layer is provided between the bridge deck connecting plate 3 and the connecting block 6. The isolation layer can be filled in the gap between the bridge deck connecting plate 3 and the connecting block 6 with a rubber sheet or other deformable material. A plastic film can also be used to prevent concrete from flowing toward the connecting block 6.

[0032] Furthermore, a steel mesh 4 is provided within the bridge deck pavement layer to enhance its ductility and strength. The steel mesh 4 is present within both the deck plate 2 and the bridge connection plate 3, and multiple layers of steel mesh 4 can be provided within the bridge deck pavement layer. Furthermore, a first connecting steel bar is provided within the bridge deck 2. This first connecting steel bar can extend into the bridge connection plate 3 and connect to a second connecting steel bar within the bridge connection plate 3 (specifically, this can be lap-welded or tied together) to increase the connection strength between the bridge connection plate 3 and the bridge deck 2.

[0033] It is understood that the first and second connecting bars can be provided simultaneously with the steel mesh 4, or can be provided by the steel bars extending along the bridge direction within the steel mesh 4. For example, the steel mesh 4 is woven from φ12 steel bars. The first connecting bar extends 15 cm into the bridge deck connection plate 3.

[0034] The bridge deck 2 is connected to the main beam 1 using a cast-in-place method. To further strengthen the connection between the bridge deck pavement and the main beam 1, weld studs 5 are installed on the top surface of the main beam 1, penetrating into the interior of the bridge deck pavement. Similarly, weld studs 5 are also installed in the precast channels of the two main beam sections 1, perpendicular to the channels' walls.

[0035] Furthermore, after the concrete forming the connecting block 6 fills the entire filling area, it continues to extend to both sides of the branch span and connects to the bridge deck 2, further enhancing the integrity and continuity of the bridge deck pavement layer. It is understood that the welding nails 5 pass through the connecting block 6 and connect to the bridge deck connection plate 3.

[0036] This embodiment also provides a construction method for the above-mentioned continuous structure of the simply supported beam bridge deck, which is carried out by a segmented casting method and specifically includes the following steps:

[0037] S1. According to the drawing requirements and the actual situation at the construction site, determine a reasonable span configuration and select a reasonable type of support 7. In this embodiment, the span configuration is 3 spans and 1 unit, 3×35m.

[0038] S2. Hoist the main beam 1 onto the support 7 and install it so that it is fixedly connected to the support 7 and a certain gap is maintained between the two main beams 1. Before installation, ensure that the rivets 5 are welded to the main beam 1, and the setting and connection of the rivets 5 comply with the requirements of the engineering specifications (the rivets 5 are mainly welded to the top surface of the main beam 1 and the prefabricated groove, and their length and shape structure meet the actual construction requirements).

[0039] S3. Tie the first connecting steel bar and steel mesh 4 at the location where the bridge deck 2 is to be laid, and then perform the first concrete pour to form the bridge deck 2 and connecting block 6. The thickness of the bridge deck 2 is set to 24 cm. During this process, it is important to ensure that one end of the first connecting steel bar extends into the predetermined position of the bridge deck connecting plate 3 to facilitate subsequent welding to the second connecting steel bar.

[0040] In this step, in order to prevent concrete from entering the expansion joints between the main beams 1 when pouring the concrete layer, rubber or other deformable materials are provided at the expansion joints between the main beams 1.

[0041] S4. After the first poured concrete is cured and solidified, the surface of the concrete block is roughened.

[0042] S5. Tie the steel mesh 4 to the location where the bridge deck connection plate 3 will be laid, again according to the drawings. Lap-weld the second connection steel bar to the first connection steel bar. After the overall reinforcement structure is completed, an isolation layer, specifically a plastic film or rubber sheet, is placed above the connection block 6. Then, a second pour of concrete is performed to form the bridge deck connection plate 3. A certain distance is maintained between the bridge deck connection plate 3 and the concrete layer, completing the continuous structure of the simply supported beam bridge deck. The length of the bridge deck connection plate 3 is 30 cm.

[0043] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A construction method for a continuous structure of a simply supported beam bridge deck, characterized in that: Used for the construction of a continuous structure of a simply supported beam bridge deck, the continuous structure of the simply supported beam bridge deck comprising: A main beam (1), wherein an expansion joint is left between two adjacent sections of the main beam (1), and a prefabricated groove is provided on the end faces of the two sections of the main beam (1) close to each other, wherein the prefabricated groove encloses a filling area, wherein the width of the filling area gradually increases from bottom to top, and the filling area is filled with concrete to form a connecting block (6); A bridge deck pavement layer, the bridge deck pavement layer comprising a bridge deck (2) and a bridge deck connecting plate (3), the bridge deck (2) being symmetrically arranged relative to the vertical center line of the expansion joint and connected to the top surface of the main beam (1), the bridge deck connecting plate (3) being located between two sections of the bridge deck (2) and being integrally connected to the bridge deck (2), and a gap being present between the bridge deck connecting plate (3) and the connecting block (6); the construction method of the continuous structure of the simply supported beam bridge deck comprises the following steps: The main beam (1) is hoisted onto a support (7) and fixed, and the expansion joint is formed between the two main beams (1); Performing a first pouring of concrete to form the bridge deck (2) and the connecting block (6); After the first poured concrete is cured and solidified, a second pouring of concrete is carried out to form the bridge deck connection plate (3).

2. The construction method of the continuous structure of the simply supported beam bridge deck according to claim 1, characterized in that: A steel mesh (4) is provided in the bridge deck pavement layer.

3. The construction method of the continuous structure of the simply supported beam bridge deck according to claim 1, characterized in that: A first connecting steel bar is provided in the bridge deck (2), a second connecting steel bar is provided in the bridge deck connecting plate (3), and the first connecting steel bar extends into the bridge deck connecting plate (3) and is connected to the second connecting steel bar.

4. The construction method of the continuous structure of the simply supported beam bridge deck according to claim 1, characterized in that: The top surface of the main beam (1) is provided with welding nails (5), and the welding nails (5) penetrate into the interior of the bridge deck pavement layer.

5. The construction method of the continuous structure of the simply supported beam bridge deck according to claim 1, characterized in that: The filling area is partially provided with welding nails (5), and the welding nails (5) are connected to the main beam (1).

6. The construction method of the continuous bridge deck structure of a simply supported beam bridge according to claim 1, characterized in that: The connecting block (6) extends toward both sides of the vertical center line of the expansion joint to connect with the bridge deck (2).

7. The construction method of the continuous structure of the simply supported beam bridge deck according to claim 1, characterized in that: An isolation layer is provided between the connection block (6) and the bridge deck connection plate (3).

8. The construction method of the continuous bridge deck structure of a simply supported beam bridge according to claim 1, characterized in that: Before the first pouring of concrete, a steel mesh (4) is tied to the bridge deck (2), so that the steel mesh (4) is provided inside the bridge deck (2); before the second pouring of concrete, a steel mesh (4) is tied to the bridge deck connecting plate (3), so that the steel mesh (4) is provided inside the bridge deck connecting plate (3).

9. The construction method of a continuous bridge deck structure of a simply supported beam bridge according to claim 1, characterized in that: When pouring the bridge deck connection plate (3), an isolation layer is provided above the connection block (6).

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