Prefabricated uHPC corrugated sheet-concrete composite bridge deck and construction method thereof

Abstract

The application provides a prefabricated UHPC corrugated plate-concrete composite bridge deck, and relates to the technical field of building structures, which comprises a plurality of first layers prefabricated by pouring super high performance concrete, and a second layer poured on site on the first layers; the prefabricated UHPC corrugated plate-concrete composite bridge deck reduces a large number of formwork and form removal on the construction site, and reduces the use of a large amount of materials such as formwork, steel pipe support and the like; meanwhile, the arrangement of the plurality of corrugated first layers can effectively reduce the self weight of the overall bridge deck; and the arrangement of the corrugations and the gaps between the plurality of second layers have better connection strength with the second layer poured on site, so that the sliding in the later period is avoided.

Description

TECHNICAL FIELD

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

[0002] Traditional concrete bridge deck is usually cast in situ or prefabricated in a factory and transported to the site for assembly. However, it has the following problems:

[0003] In-situ casting requires in-situ formwork supported by the ground, and then pouring and forming. It not only consumes a large amount of materials (such as formwork, steel pipe support, etc.), but also requires certain human resources to carry out the work of assembling and disassembling the formwork and installing the bottom support of the plate. Although prefabrication in a factory does not require formwork on site, the prefabricated product has a large self-weight and is relatively inconvenient to transport. In addition, the thickness and self-weight of the traditional concrete bridge deck are large, which increases the seismic force and the foundation stress. This means that in order to ensure the seismic performance and structural safety of the bridge, a more solid foundation is needed to bear the upper load, i.e. the foundation cost is increased.

[0004] At present, the problems of traditional concrete bridge deck can be solved by combining prefabricated concrete plates with cast-in-place concrete. However, the connection strength between the prefabricated concrete part and the cast-in-place concrete part of the prefabricated composite bridge deck is a technical problem that needs to be solved urgently. SUMMARY

[0005] The present application relates to the technical field of building structures, in particular to a prefabricated UHPC corrugated plate-concrete composite bridge deck and a construction method thereof.

[0006] The present application adopts the following scheme:

[0007] The present application provides a prefabricated UHPC corrugated plate-concrete composite bridge deck, which comprises a plurality of first layers prefabricated by pouring ultra-high performance concrete, and a second layer poured in situ on the first layers; a plurality of the first layers are fixed side by side along the bending direction on the pier; the first layer is corrugated, which comprises a corrugated first steel mesh and ultra-high performance concrete poured on the first steel mesh; the formed first layer comprises an upper unit, a lower unit arranged 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 more than twice the thickness of the upper unit; the second layer comprises a planar second steel mesh and concrete poured between the second steel mesh and the gaps between the first layers.

[0008] Further, the first steel mesh is arranged at 20mm from the bottom surface of the first layer; and the second steel mesh is arranged at 20mm from the top of the second layer.

[0009] Further, the first steel mesh comprises a plurality of first transverse steel bars arranged at intervals in a corrugated shape, and a plurality of first longitudinal steel bars connected to the inner bending portions of the first transverse steel bars.

[0010] Further, the second steel mesh comprises 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.

[0011] Further, the first steel mesh is further provided with connecting steel bars capable of connecting the second steel mesh.

[0012] Further, the first layer is connected to the pier by means of a channel steel beam.

[0013] A construction method of the prefabricated UHPC corrugated plate-concrete composite bridge deck slab comprises the following steps:

[0014] Prefabrication of the first layer: first, a first steel mesh is made, the first transverse steel bars bent in a corrugated shape are fixed on a workbench at equal intervals along the bending direction of the bridge plate, then a first longitudinal steel bar is connected to each inner bending portion of the first transverse steel bars to form the first steel mesh; then, the first longitudinal steel bars are anchored on the anchorage devices at both ends of the workbench by means of the pretensioning method, the bolt hole is reserved, the formwork is erected, and the ultra-high performance concrete is poured;

[0015] A plurality of prefabricated first layers are hoisted to the pier, and are fixed on the pier by means of the connection between the bolts and the bolt holes along the parallel arrangement in the bending direction.

[0016] Pouring and forming of the second layer: the second transverse steel bars are arranged at equal intervals along the bending direction of the prefabricated plate, the second longitudinal steel bars are arranged at equal intervals and connected perpendicularly to the second transverse steel bars to form a second steel mesh, then the second steel mesh is erected above the first layer, and finally the concrete is poured in the gaps between the second steel mesh and the plurality of first layers to complete the construction.

[0017] By adopting the above technical scheme, the application can achieve the following technical effects:

[0018] The application provides a prefabricated UHPC corrugated plate-concrete composite bridge deck, which comprises a plurality of first layers prefabricated by pouring super high performance concrete and a second layer poured on the first layers on site; the prefabricated UHPC corrugated plate-concrete composite bridge deck reduces a large amount of formwork and form removal on the construction site and reduces the use of a large amount of materials such as formwork and steel pipe support; meanwhile, the plurality of corrugated first layers can effectively reduce the self weight of the whole bridge deck; and the corrugated arrangement and the gap between the plurality of second layers have better connection strength with the second layer poured on site, so that the sliding in the later period is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the application Figure 1 ;

[0020] Figure 2 is a structural schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the application

[0021] Figure 3 is a structural schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the application

[0022] Figure 4 is a structural schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the application

[0023] Figure 5 is a structural schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the application

[0024] Figure 6 is a structural schematic diagram of a prefabricated UHPC corrugated plate-concrete composite bridge deck according to an embodiment of the application Figure 2 ;

[0025] Figure: second layer 1, first layer 2, first steel bar net 3, second steel bar net 4, stud 5, I-shaped steel beam 6, upper unit 21, middle unit 22, lower unit 23, first transverse steel bar 31, first longitudinal steel bar 32, second transverse steel bar 41, and second longitudinal steel bar 42. DETAILED DESCRIPTION

[0026] EMBODIMENT

[0027] COMBINATION Figures 1 to 6As shown, this embodiment provides a precast UHPC corrugated slab-concrete composite bridge deck, including multiple first layers 2 precast by pouring ultra-high performance concrete, and second layers 1 cast on-site on the first layers 2; multiple first layers 2 are fixed side by side to the bridge piers along the bending direction; the first layers 2 are corrugated, including corrugated first steel mesh 3, and ultra-high performance concrete cast on the first steel mesh 3; the second layer 1 includes a planar second steel mesh 4, concrete cast on the second steel mesh 4, and concrete in the gaps between the multiple first layers 2.

[0028] In this embodiment, the corrugated first layer 2 includes an upper unit 21, a lower unit 23 offset from the upper unit 21, and an intermediate unit 22 connecting the upper unit 21 and the lower unit 23; the corrugated design increases the connection strength between the precast concrete portion and the cast-in-place concrete portion. The thickness of the lower unit 23 is greater than twice the thickness of the upper unit 21 to ensure its tensile performance.

[0029] Specifically, such as Figure 3 As shown, the first reinforcing mesh 3 includes multiple corrugated first transverse reinforcing bars 31 spaced apart along the bending direction of the bridge deck, and multiple first longitudinal reinforcing bars 32 connected to the internal bends of the first transverse reinforcing bars 31. The first reinforcing mesh 3 is positioned 20mm from the bottom surface of the first layer 2. Ultra-high performance concrete (UHPC) is poured on the first reinforcing mesh 3. UHPC has ultra-high strength and high durability, with a compressive strength reaching 150-200MPa and excellent crack resistance. Using UHPC can increase the load-bearing capacity of the wall panel while reducing the thickness of the precast concrete bridge deck, fully utilizing the excellent mechanical properties of UHPC. The precast second layer 1 is manufactured in the factory and transported to the construction site. Its processing meets the construction quality requirements while reducing resource waste, i.e., the formwork does not require a large number of long steel pipes for support.

[0030] The second reinforcing mesh 4 is arranged inside the cast-in-place concrete slab, such as... Figure 4 As shown, it includes multiple second transverse reinforcing bars 41 evenly spaced along the bending direction of the precast slab (i.e., the first layer 2), and multiple second longitudinal reinforcing bars 42 perpendicular to and connected to the second transverse reinforcing bars 41. The second reinforcing mesh 4 is positioned 20 mm from the top of the second layer 1. Concrete is poured into the second reinforcing mesh 4 and the gaps between the multiple first layers 2. The corrugated first layer 2 prevents the second layer 1 from slipping along its width after pouring, while the gaps between the multiple first layers 2 prevent the second layer 1 from slipping along its length.

[0031] Preferably, the first steel mesh 3 is also provided with connecting steel bars that can connect the second steel mesh 4. For example, longitudinal connecting steel bars are connected on the first steel mesh 3 to make a protruding part after the ultra-high performance concrete is poured, and after the second steel mesh 4 is hoisted onto the first layer 2, the connecting steel bars are connected to form a larger steel cage, which increases the overall stability of the entire bridge deck and better guarantees the bearing capacity of the bridge deck cross section.

[0032] In this embodiment, there is also a channel steel beam 6 for connecting the first layer 2 to the pier; before pouring the first layer 2, bolt 5 holes are reserved, and when the first layer 2 is hoisted onto the pier, the assembly of the first layer 2 and the pier can be realized through the connection of the bolt 5 and the bolt 5 hole.

[0033] A plurality of first layers 2 poured by ultra-high performance concrete, and a second layer 1 poured on site on the first layer 2; which reduces a large amount of formwork and formwork dismantling on 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 a plurality of corrugated first layers 2 can effectively reduce the self-weight of the overall bridge deck; and the arrangement of corrugations and the gap between a plurality of second layers 1 have better connection strength with the second layer 1 poured on site, avoiding later slippage.

[0034] The following specifically describes the construction method of the prefabricated UHPC corrugated plate-concrete composite bridge deck, which includes the following steps:

[0035] 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 along the bending direction of the bridge deck at equal intervals, then connect a first longitudinal steel bar 32 at each bending position inside the first transverse steel bar 31 to form the first steel mesh 3; then, anchor the first longitudinal steel bars 32 on the anchorages at both ends of the workbench using the pretensioning method, and arrange the first steel mesh 3 at a distance of 20mm from the bottom surface of the first layer 2; after reserving the bolt 5 holes, perform formwork and pour ultra-high performance concrete;

[0036] Hoist a plurality of prefabricated first layers 2 onto the pier, and fix them on the pier through the connection of the bolt 5 and the bolt 5 hole along the parallel arrangement in the bending direction;

[0037] Pouring and forming of the second layer 1: arrange the second transverse steel bars 41 at equal intervals along the bending direction of the prefabricated plate, arrange and connect the second longitudinal steel bars 42 at equal intervals perpendicular to the second transverse steel bars 41 to form the second steel mesh 4, then erect the second steel mesh 4 at a distance of 20mm above the first layer 2, and finally pour concrete on the second steel mesh 4 and the gaps between the plurality of first layers 2 to complete the construction.

[0038] The construction method can directly use the first layer 2 as a support to perform formwork supporting during pouring and forming of the second layer 1, and does not need to use steel pipes or other supports to perform supporting, thereby reducing the use of a large amount of materials such as formworks and steel pipe supports.

[0039] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments only, and any technical solution falling within the concept of the present application belongs to the protection scope of the present application.

[0040] It should be understood that: the above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments only, and any technical solution falling within the concept of the present application belongs to the protection scope of the present application.

[0041] The above introduction of the drawings used in the embodiments only shows some embodiments of the present application, and should not be considered as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained according to the drawings without creative labor.

Claims

1. A precast UHPC corrugated slab-concrete composite deck slab comprising a plurality of first layers precast by casting of ultra-high performance concrete, and a second layer cast in situ on said first layers; characterized in that, A plurality of the first layers are fixed on the piers along the bending direction in parallel; the first layer is corrugated, which comprises a corrugated first reinforcement mesh and super high performance concrete poured on the first reinforcement mesh; the shaped 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 reinforcement mesh and concrete poured on the second reinforcement mesh and the gaps between a plurality of the first layers; The first reinforcement mesh is arranged 20mm away from the bottom surface of the first layer; the second reinforcement mesh is arranged 20mm away from the top of the second layer; the first reinforcement mesh comprises a plurality of corrugated first transverse reinforcements arranged at intervals, and a plurality of first longitudinal reinforcements connected to the inner bending portions of the first transverse reinforcements; the second reinforcement mesh comprises a plurality of second transverse reinforcements arranged at intervals, and a plurality of second longitudinal reinforcements connected to the second transverse reinforcements.

2. The precast UHPC corrugated slab-concrete composite deck panel according to claim 1, characterized in that, The first reinforcement mesh is further provided with connecting reinforcements capable of connecting the second reinforcement mesh.

3. The precast UHPC corrugated slab-concrete composite deck panel according to claim 1, characterized in that, The first layer is further connected to the pier by a channel steel beam.

4. A method of constructing a precast UHPC corrugated slab-concrete composite bridge deck slab as claimed in claim 1, characterized in that, The method comprises the following steps: Preparation of the first layer: first, a first reinforcement mesh is made, the corrugated first transverse reinforcements are fixed on the workbench along the bending direction of the bridge plate at equal intervals, then a first longitudinal reinforcement is connected to each inner bending portion of the first transverse reinforcements to form the first reinforcement mesh; then, the first longitudinal reinforcements are anchored on the anchorage devices at both ends of the workbench by the pretensioning method, the bolt hole is reserved, the formwork is set, and the super high performance concrete is poured; A plurality of the first layers are hoisted to the piers, fixed on the piers by the connection of the bolts and the bolt holes along the bending direction in parallel; Pouring and shaping of the second layer: the second transverse reinforcements are arranged at equal intervals along the bending direction of the precast plate, the second longitudinal reinforcements are arranged at equal intervals and connected perpendicularly to the second transverse reinforcements to form the second reinforcement mesh, then the second reinforcement mesh is erected 20mm above the first layer, and finally the concrete is poured on the second reinforcement mesh and the gaps between a plurality of the first layers to complete the construction.

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