Prefabricated UHPC corrugated plate-concrete composite bridge deck slab and construction method thereof

Abstract

The invention provides a prefabricated UHPC corrugated plate-concrete laminated bridge deck slab, and relates to the technical field of building structures, the prefabricated UHPC corrugated plate-concrete laminated bridge deck slab comprises a plurality of first layers prefabricated by pouring ultra-high performance concrete, and second layers poured on the first layers in situ; a large number of formwork erecting and dismantling on a construction site are reduced, and use of a large number of materials such as formworks and steel pipe supports is reduced; meanwhile, the plurality of corrugated first layers are arranged, so that the self weight of the whole bridge deck can be effectively reduced; and due to the corrugated arrangement and the gaps between the multiple second layers, better connection strength is achieved with the cast-in-place second layers, and later slippage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and in particular to a prefabricated UHPC corrugated plate-concrete composite bridge deck and a construction method thereof. Background Art

[0002] Traditional concrete bridge decks are usually cast on site or prefabricated in a prefabrication plant and transported to the site for assembly. This has the following problems: On-site pouring requires on-site formwork supported by the ground, followed by pouring and forming. This not only consumes a large amount of materials (such as formwork, steel pipe support, etc.), but also requires a certain amount of human resources to install and remove the formwork and install the bottom support of the slab. Although prefabrication in a prefabricated plant does not require on-site formwork, its self-weight after prefabrication is large and transportation is relatively inconvenient. In addition, the traditional concrete bridge deck is designed to be thick and heavy, which increases the impact of seismic forces on it and increases the stress on the foundation. This means that in order to ensure the seismic performance and structural safety of the bridge, a stronger foundation is needed to bear the upper load, which increases the foundation cost.

[0003] At present, the problems existing in traditional concrete bridge decks can be solved by combining precast concrete slabs and cast-in-place concrete; however, the connection strength between the precast concrete part and the cast-in-place concrete part in the precast composite bridge deck is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The object of the present invention is to provide a prefabricated UHPC corrugated plate-concrete composite bridge deck and a construction method thereof to solve the above-mentioned problems.

[0005] The present invention adopts the following scheme: The present application provides a prefabricated UHPC corrugated plate-concrete composite bridge deck, comprising a plurality of first layers prefabricated by casting ultra-high performance concrete, and a second layer cast on site on the first layer; the plurality of first layers are fixed in parallel on a bridge pier along a bending direction; the first layer is corrugated, comprising a corrugated first steel mesh, and ultra-high performance concrete cast on the first steel mesh; the first layer after molding comprises an upper unit, a lower unit staggered with the upper unit, and an intermediate unit connected to the upper unit and the lower unit; the thickness of the lower unit is greater than twice the thickness of the upper unit; the second layer comprises a planar second steel mesh, concrete cast on the second steel mesh, and the gaps between the plurality of first layers.

[0006] Furthermore, the first steel mesh is arranged at 20 mm from the bottom surface of the first layer; and the second steel mesh is arranged at 20 mm from the top surface of the second layer.

[0007] Furthermore, the first steel mesh includes a plurality of first transverse steel bars in a corrugated shape and arranged at intervals, and a plurality of first longitudinal steel bars connected to the inner bending parts of the first transverse steel bars.

[0008] Furthermore, the second steel mesh includes a plurality of second transverse steel bars arranged at intervals, and a plurality of second longitudinal steel bars connected to the second transverse steel bars.

[0009] Furthermore, the first reinforcement mesh is also provided with connecting reinforcements that can be connected to the second reinforcement mesh.

[0010] Furthermore, it also includes an I-shaped steel beam for connecting the first layer to the bridge pier.

[0011] A construction method of a prefabricated UHPC corrugated plate-concrete composite bridge deck comprises the following steps: Prefabrication of the first layer: First, make the first steel mesh, fix the first transverse steel bars bent into a corrugated shape on the workbench at equal intervals along the bending direction of the bridge deck, and then connect a first longitudinal steel bar to each bending part inside the first transverse steel bar to form the first steel mesh; then, use the pre-tensioning method to anchor the first longitudinal steel bars to the anchors at both ends of the workbench, reserve bolt holes, support the formwork and pour ultra-high performance concrete; A plurality of prefabricated first layers are hoisted onto the bridge piers, and are fixed on the bridge piers by connecting the bolts and bolt holes in parallel along the bending direction; Casting of the second layer: Arrange the second transverse steel bars at equal intervals along the bending direction of the precast slab, arrange and connect the second longitudinal steel bars perpendicular to the second transverse steel bars at equal intervals to form a second steel mesh, and then erect the second steel mesh above the first layer. Finally, pour concrete in the gaps between the second steel mesh and multiple first layers to complete the construction.

[0012] By adopting the above technical solution, the present invention can achieve the following technical effects: The present invention provides a prefabricated UHPC corrugated plate-concrete composite bridge deck, comprising a plurality of first layers prefabricated by casting ultra-high performance concrete, and a second layer cast on site on the first layer; it reduces a large amount of formwork and demoulding at the construction site, and reduces the use of a large amount of materials such as formwork, steel pipe support, etc.; at the same time, the arrangement of the plurality of corrugated first layers can effectively reduce the dead weight of the entire bridge deck; and the corrugated arrangement and the gaps between the plurality of second layers have better connection strength with the second layer cast on site, avoiding slippage in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the first-layer structure of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a first steel mesh structure of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a second steel mesh structure of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a partial assembly structure of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the present invention. Figure 2 ; Icons: second layer 1, first layer 2, first steel mesh 3, second steel mesh 4, bolts 5, I-shaped steel beam 6, upper unit 21, middle unit 22, lower unit 23, first transverse steel bars 31, first longitudinal steel bars 32, second transverse steel bars 41, second longitudinal steel bars 42. DETAILED DESCRIPTION

[0014] Example Combination Figures 1 to 6 As shown, this embodiment provides a prefabricated UHPC corrugated plate-concrete composite bridge deck, including a plurality of first layers 2 prefabricated by ultra-high performance concrete, and a second layer 1 cast on site on the first layer 2; a plurality of the first layers 2 are fixed in parallel on the pier along the bending direction; the first layer 2 is corrugated, comprising a corrugated first steel mesh 3, and ultra-high performance concrete cast on the first steel mesh 3; the second layer 1 comprises a planar second steel mesh 4, concrete cast on the second steel mesh 4 and in the gaps between the plurality of the first layers 2.

[0015] In this embodiment, the corrugated first layer 2 includes an upper unit 21, a lower unit 23 staggered with the upper unit 21, and an intermediate unit 22 connected to the upper unit 21 and the lower unit 23; the corrugated arrangement increases the connection strength between the precast concrete part and the cast-in-place concrete part. The thickness of the lower unit 23 is greater than twice the thickness of the upper unit 21 to ensure its tensile performance.

[0016] Specifically, Figure 3As shown, the first steel mesh 3 includes a plurality of first transverse steel bars 31 in a corrugated shape arranged at intervals along the bending direction of the bridge deck, and a plurality of first longitudinal steel bars 32 connected to the inner bending part of the first transverse steel bars 31. The first steel mesh 3 is arranged at 20 mm from the bottom surface of the first layer 2; ultra-high performance concrete (UHPC) is poured on the first steel mesh 3. Ultra-high performance concrete (UHPC) has ultra-high strength and high durability. Its compressive strength can not only reach 150-200 MPa, but also has excellent crack resistance. The use of UHPC can reduce the thickness of the precast concrete bridge deck while increasing the bearing capacity of the wall panel, giving full play to the excellent mechanical properties of UHPC. The prefabricated second layer 1 is completed in the factory and transported to the construction site. Its processing process meets the construction quality requirements and can also reduce resource waste, that is, the formwork does not need to be supported by a large number of long steel pipes.

[0017] The second steel mesh 4 is arranged inside the cast-in-place concrete slab. Figure 4 As shown, it includes a plurality of second transverse steel bars 41 arranged at equal intervals along the bending direction of the precast plate (i.e., the first layer 2), and a plurality of second longitudinal steel bars 42 perpendicular to the second transverse steel bars 41 and connected to the second transverse steel bars 41. The second steel mesh 4 is arranged 20 mm from the top of the second layer 1. Concrete is poured on the second steel mesh 4 and in the gaps between the plurality of first layers 2. The corrugated first layer 2 can prevent the second layer 1 from sliding in the width direction after pouring, and the gaps between the plurality of first layers 2 can prevent the second layer 1 from sliding in the length direction.

[0018] Preferably, the first reinforcement mesh 3 is also provided with connecting steel bars that can be connected to the second reinforcement mesh 4. For example, longitudinal connecting steel bars are connected to the first reinforcement mesh 3 so that a protruding portion is provided after pouring the ultra-high performance concrete, and after the second reinforcement mesh 4 is hoisted onto the first layer 2, it is connected with the connecting steel bars to form a larger reinforcement cage, thereby increasing the overall stability of the entire bridge deck and better ensuring the bearing capacity of the bridge deck cross section.

[0019] In this embodiment, an I-shaped steel beam 6 is also included, which is used to connect the first layer 2 to the bridge pier. Before the first layer 2 is cast, holes for bolts 5 are reserved. When the first layer 2 is hoisted onto the bridge pier, the first layer 2 and the bridge pier can be assembled by connecting the bolts 5 with the holes for the bolts 5.

[0020] A plurality of prefabricated first layers 2 cast by ultra-high performance concrete and a second layer 1 cast on site on the first layer 2 reduce a large amount of formwork and demoulding at the construction site and the use of a large amount of materials such as formwork and steel pipe supports. At the same time, the arrangement of a plurality of corrugated first layers 2 can effectively reduce the self-weight of the entire bridge deck. The corrugated arrangement and the gaps between the plurality of second layers 1 provide a better connection strength with the second layer 1 cast on site to avoid slippage at a later stage.

[0021] The construction method of the prefabricated UHPC corrugated plate-concrete composite bridge deck includes the following steps: Prefabrication of the first layer 2: First, make the first steel mesh 3, fix the first transverse steel bars 31 bent into a corrugated shape on the workbench at equal intervals along the bending direction of the bridge deck, and then connect a first longitudinal steel bar 32 to each bending position inside the first transverse steel bar 31 to form the first steel mesh 3; then, use the pre-tensioning method to anchor the first longitudinal steel bars 32 to the anchors at both ends of the workbench, and set the first steel mesh 3 at 20 mm from the bottom surface of the first layer 2; after reserving 5 bolt holes, support the formwork and pour ultra-high performance concrete; A plurality of prefabricated first layers 2 are hoisted onto the bridge pier, and are fixed on the bridge pier by connecting the bolts 5 with the bolt 5 holes in parallel along the bending direction; Casting of the second layer 1: Arrange the second transverse steel bars 41 at equal intervals along the bending direction of the precast slab, arrange the second longitudinal steel bars 42 at equal intervals perpendicular to the second transverse steel bars 41 and connect them to form a second steel mesh 4, then set up the second steel mesh 4 at a distance of 20 mm above the first layer 2, and finally pour concrete on the second steel mesh 4 and in the gaps between multiple first layer 2 pieces to complete the construction.

[0022] In this construction method, the first layer 2 can be directly used as a support for the casting of the second layer 1, without the need for steel pipes or other supports, thereby reducing the use of a large amount of materials such as templates, steel pipe supports, etc.

[0023] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0024] It should be understood that the above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0025] The above description of the drawings used in the implementation manner only illustrates certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

Claims

1. A prefabricated UHPC corrugated plate-concrete composite bridge deck, comprising a plurality of first layers prefabricated by pouring ultra-high performance concrete, and a second layer poured on site on the first layers; characterized in that: A plurality of the first layers are fixed on the pier in parallel along the bending direction; the first layer is corrugated, comprising a corrugated first steel mesh and ultra-high performance concrete cast on the first steel mesh; the formed first layer comprises an upper unit, a lower unit staggered with the upper unit, and an intermediate unit connected to the upper unit and the lower unit; wherein the thickness of the lower unit is greater than twice the thickness of the upper unit; the second layer comprises a planar second steel mesh, concrete cast on the second steel mesh and in the gaps between the plurality of the first layers.

2. The prefabricated UHPC corrugated plate-concrete composite bridge deck according to claim 1, characterized in that: The first steel mesh is arranged at a distance of 20 mm from the bottom surface of the first layer; the second steel mesh is arranged at a distance of 20 mm from the top surface of the second layer.

3. The prefabricated UHPC corrugated plate-concrete composite bridge deck according to claim 2, characterized in that: The first steel mesh includes a plurality of first transverse steel bars arranged at intervals and in a corrugated shape, and a plurality of first longitudinal steel bars connected to the inner bending parts of the first transverse steel bars.

4. The prefabricated UHPC corrugated plate-concrete composite bridge deck according to claim 3, characterized in that: The second steel mesh includes a plurality of second transverse steel bars arranged at intervals, and a plurality of second longitudinal steel bars connected to the second transverse steel bars.

5. The prefabricated UHPC corrugated plate-concrete composite bridge deck according to claim 1, characterized in that: The first reinforcement mesh is also provided with connecting reinforcements that can be connected to the second reinforcement mesh.

6. The prefabricated UHPC corrugated plate-concrete composite bridge deck according to claim 1, characterized in that: Also included is an I-shaped steel beam for connecting the first layer to the bridge pier.

7. A construction method for a prefabricated UHPC corrugated plate-concrete composite bridge deck as claimed in claim 4, characterized in that: The following steps are involved: Prefabrication of the first layer: First, make the first steel mesh, fix the first transverse steel bars bent into a corrugated shape on the workbench at equal intervals along the bending direction of the bridge deck, and then connect a first longitudinal steel bar to each bending part inside the first transverse steel bar to form the first steel mesh; then, use the pre-tensioning method to anchor the first longitudinal steel bars to the anchors at both ends of the workbench, reserve bolt holes, support the formwork and pour ultra-high performance concrete; A plurality of prefabricated first layers are hoisted onto the bridge piers, and are fixed on the bridge piers by connecting the bolts and bolt holes in parallel along the bending direction; Casting of the second layer: Arrange the second transverse steel bars at equal intervals along the bending direction of the precast slab, arrange and connect the second longitudinal steel bars perpendicular to the second transverse steel bars at equal intervals to form a second steel mesh, then erect the second steel mesh above the first layer, and finally pour concrete on the gaps between the second steel mesh and multiple first-layer components to complete the construction.

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