Template-free cast-in-situ uHPC steel-concrete composite bridge deck and construction method thereof

Abstract

The application discloses a kind of no template cast-in-situ UHPC steel concrete combined bridge deck and its construction method, including the pattern steel plate welded on longitudinal girder;Pattern steel plate top surface welding has shear pin, longitudinal reinforcement support plate and vertical support, shear pin is arranged longitudinally in the corresponding position of longitudinal girder, longitudinal reinforcement support plate is used to install the transverse reinforcement in bottom layer reinforcement and control its spacing and reinforcement cover thickness, longitudinal reinforcement in bottom layer reinforcement is arranged on the upside of transverse reinforcement, vertical support is welded with transverse reinforcement support plate along line top, and transverse reinforcement support plate is used to support and install longitudinal reinforcement in top layer reinforcement and control its spacing, and the transverse reinforcement in top layer reinforcement is arranged on the upside of longitudinal reinforcement;The bottom surface of pattern steel plate is welded with horizontal stiffening rib, side and beam end upside welding baffle;UHPC concrete is cast-in-situ in the space surrounded by baffle on pattern steel plate.The application avoids ordinary steel bridge deck fatigue disease, no construction waste, and operation is convenient.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction, specifically relating to a formworkless cast-in-place UHPC steel-concrete composite bridge deck and its construction method. Background Technology

[0002] In bridge structures, the bridge deck is the load-bearing structure that directly bears the wheel pressure of vehicles, directly affecting structural safety and driving comfort; therefore, it requires sufficient strength and stiffness. Currently, bridge decks are mainly made of concrete or steel. Concrete bridge decks require a large amount of formwork and supports during construction, which is often impossible due to construction constraints. Orthotropic steel bridge decks are expensive, have low stiffness, are prone to fatigue fracture, and have many defects. Therefore, steel-concrete composite bridge deck structures have become a key research direction in the engineering field in recent years.

[0003] Steel-concrete composite bridge decks are now widely used. The typical construction method involves prefabricating the concrete bridge deck in a factory, hoisting it into place, and then casting wet joints to form a shared load-bearing structure. However, when prefabrication sites are lacking, the cast-in-place concrete construction requires a large amount of formwork and supports, which greatly limits the application of steel-concrete composite bridge decks. Summary of the Invention

[0004] The purpose of this invention is to provide a formwork-free cast-in-place UHPC (ultra-high performance concrete) steel-concrete composite bridge deck and its construction method. This invention has a reasonable structure, avoids the fatigue problems of ordinary steel bridge decks, produces no excess construction waste, facilitates standardized on-site construction, and is easy to operate.

[0005] The technical solution of this invention is:

[0006] A formworkless cast-in-place UHPC steel-concrete composite bridge deck includes a patterned steel plate welded onto the longitudinal main beams. Shear studs, longitudinal reinforcement support plates, and vertical supports are welded to the top surface of the patterned steel plate. The shear studs are arranged longitudinally at corresponding positions on the longitudinal main beams. The longitudinal reinforcement support plates are used to install the transverse reinforcement in the bottom layer of reinforcement and control its spacing and the thickness of the concrete cover. The longitudinal reinforcement in the bottom layer of reinforcement is positioned above the transverse reinforcement. A transverse reinforcement support plate is welded to the top of the vertical supports. The transverse reinforcement support plate is used to support and install the longitudinal reinforcement in the top layer of reinforcement and control its spacing. The transverse reinforcement in the top layer of reinforcement is positioned above the longitudinal reinforcement. Transverse stiffening ribs are welded to the bottom surface of the patterned steel plate, and baffles are welded to the sides and the upper side of the beam ends. Stiffening plates are welded between the baffles and the patterned steel plate. UHPC concrete is cast-in-place within the space enclosed by the baffles on the patterned steel plate.

[0007] Preferably, the patterned steel plate has horizontal patterns with a pattern height of 1-3 mm and a pattern spacing of 10 mm.

[0008] Preferably, the stiffening plate is triangular.

[0009] Preferably, the longitudinal reinforcement support plate is aligned with the longitudinal main beam.

[0010] Preferably, the top of the longitudinal reinforcement support plate is provided with a semi-circular groove, the diameter of the groove is consistent with the designed diameter of the transverse reinforcement in the bottom layer, the spacing is consistent with the designed spacing of the transverse reinforcement in the bottom layer, and the height of the bottom end of the groove from the bottom end of the longitudinal reinforcement support plate is consistent with the designed thickness of the reinforcement protective layer of the transverse reinforcement in the bottom layer.

[0011] Preferably, the top of the transverse reinforcement support plate is provided with a semi-circular groove, the diameter of which is consistent with the designed diameter of the longitudinal reinforcement in the top layer reinforcement, the spacing of which is consistent with the designed spacing of the longitudinal reinforcement in the top layer reinforcement, and the height of the transverse reinforcement in the top layer reinforcement from the top of the baffle is consistent with the designed thickness of the reinforcement protective layer of the transverse reinforcement in the top layer reinforcement.

[0012] The above-mentioned construction method for cast-in-place UHPC steel-concrete composite bridge deck without formwork includes the following steps:

[0013] 1) Weld the patterned steel plate onto the longitudinal main beam, and weld transverse stiffening ribs onto the bottom surface of the patterned steel plate;

[0014] 2) Weld baffles to the sides of the patterned steel plate and the upper side of the beam end, and weld stiffening plates between the baffles and the patterned steel plate;

[0015] 3) Weld longitudinal steel reinforcement support plates to the top surface of the patterned steel plate, aligning the longitudinal steel reinforcement support plates with the longitudinal main beam;

[0016] 4) Arrange the bottom layer of reinforcement: First, install the transverse reinforcement along the longitudinal reinforcement support plate, and then arrange the longitudinal reinforcement on the transverse reinforcement.

[0017] 5) Weld vertical supports to the top surface of the patterned steel plate, and weld horizontal steel reinforcement brackets to the top of the vertical supports along the line;

[0018] 6) Arrange the top layer of reinforcement: First, install the longitudinal reinforcement along the transverse reinforcement support plate, and then arrange the transverse reinforcement on the longitudinal reinforcement;

[0019] 7) Cast UHPC concrete in place within the space enclosed by the baffle on the checkered steel plate, with the pouring thickness consistent with the height of the baffle.

[0020] 8) Once the UHPC concrete has reached its strength, the construction of the cast-in-place UHPC steel-concrete composite bridge deck is completed.

[0021] The beneficial effects of this invention are:

[0022] The present invention has a reasonable structure and adopts a cast-in-place UHPC steel-concrete composite. The patterned steel plate can bond well with the UHPC concrete to form a better shared load-bearing structure, avoiding problems such as fatigue disease of ordinary steel bridge deck.

[0023] This invention uses formwork-free cast-in-place UHPC concrete, avoiding the complicated process of erecting and dismantling formwork required in traditional cast-in-place construction. It uses a load-bearing structure to replace traditional formwork, resulting in no excess construction waste, making it green and environmentally friendly, facilitating standardized on-site construction, and making cast-in-place construction more convenient and easier to operate.

[0024] This invention uses longitudinal and transverse steel reinforcement support plates to effectively control steel reinforcement binding. Compared with the wet joint method at the rear foot of precast bridge deck, the bridge deck has better overall integrity and more reliable quality. At the same time, it eliminates complex procedures such as building a prefabrication yard and hoisting into place during construction, and has a wider range of application scenarios. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural diagram of the formworkless cast-in-place UHPC steel-concrete composite bridge deck in an embodiment of the present invention.

[0026] Figure 2 This is a bridge deck structure diagram for step three of the construction of the formworkless cast-in-place UHPC steel-concrete composite bridge deck in an embodiment of the present invention.

[0027] Figure 3 This is a bridge deck structure diagram for step four of the construction of the formworkless cast-in-place UHPC steel-concrete composite bridge deck in an embodiment of the present invention.

[0028] Figure 4 This is a bridge deck structure diagram for step five of the construction of the formworkless cast-in-place UHPC steel-concrete composite bridge deck in an embodiment of the present invention.

[0029] Figure 5 This is a bridge deck structure diagram for step six of the construction of the formworkless cast-in-place UHPC steel-concrete composite bridge deck in an embodiment of the present invention.

[0030] In the diagram: 1-Longitudinal main beam; 2-Patterned steel plate; 3-Transverse stiffening plate; 4-Side baffle; 5-Beam end baffle; 6-Stiffening plate; 7-Longitudinal reinforcement support plate; 8-Shear stud; 9-Bottom layer reinforcement; 10-Vertical support; 11-Transverse reinforcement support plate; 12-Top layer reinforcement. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] like Figures 1 to 5As shown, a formworkless cast-in-place UHPC steel-concrete composite bridge deck includes a patterned steel plate 2 welded and installed on a longitudinal main beam 1; shear studs 8, longitudinal reinforcement support plates 7, and vertical supports 10 are welded to the top surface of the patterned steel plate 2. The shear studs 8 are arranged longitudinally at corresponding positions on the longitudinal main beam 1. The longitudinal reinforcement support plates 7 are used to install the transverse reinforcement in the bottom layer reinforcement 9 and control its spacing and the thickness of the reinforcement protective layer. The longitudinal reinforcement in the bottom layer reinforcement 9 is arranged on the upper side of the transverse reinforcement. The vertical supports 10 are welded to the top of the line with transverse reinforcement support plates 11. The transverse reinforcement support plates 11 are used to support the installation of the longitudinal reinforcement in the top layer reinforcement 12 and control its spacing. The transverse reinforcement in the top layer reinforcement 12 is arranged on the upper side of the longitudinal reinforcement; transverse stiffening ribs 3 are welded to the bottom surface of the patterned steel plate 2, and baffles (4, 5) are welded to the sides and the upper side of the beam ends. Stiffening plates 6 are welded between the baffles (4, 5) and the patterned steel plate 2; UHPC concrete is cast-in-place within the space enclosed by the baffles on the patterned steel plate 2.

[0033] In this embodiment, preferably, the patterned steel plate 2 is provided with a horizontal pattern, the pattern height is 1-3mm, and the pattern spacing is 10mm.

[0034] like Figures 2 to 5 As shown, in this embodiment, preferably, the stiffening plate 6 is triangular.

[0035] In this embodiment, preferably, the longitudinal steel reinforcement support plate 7 is aligned with the longitudinal main beam 1.

[0036] like Figures 2 to 5 As shown, in this embodiment, preferably, the top of the longitudinal steel bar support plate 7 is provided with a semi-circular groove. The diameter of the groove is consistent with the diameter of the transverse steel bars in the bottom layer steel bar 9, and the spacing is consistent with the spacing of the transverse steel bars in the bottom layer steel bar 9. The height of the bottom end of the groove from the bottom end of the longitudinal steel bar support plate 7 is consistent with the thickness of the steel bar protective layer in the transverse steel bars in the bottom layer steel bar 9.

[0037] Preferably, the top of the transverse reinforcement support plate 11 is provided with a semi-circular groove, the diameter of the groove is consistent with the designed diameter of the longitudinal reinforcement in the top layer reinforcement 12, the spacing is consistent with the designed spacing of the longitudinal reinforcement in the top layer reinforcement 12, and the height of the transverse reinforcement in the top layer reinforcement 12 from the top of the baffle (4, 5) is consistent with the designed reinforcement protective layer thickness of the transverse reinforcement in the top layer reinforcement 12.

[0038] The above-mentioned construction method for cast-in-place UHPC steel-concrete composite bridge deck without formwork includes the following steps:

[0039] 1) Weld the patterned steel plate 2 onto the longitudinal main beam 1, and weld the transverse stiffening ribs 3 onto the bottom surface of the patterned steel plate 2;

[0040] 2) Weld baffles (4, 5) to the side of the patterned steel plate 2 and the upper side of the beam end, and weld stiffening plates (6) between the baffles (4, 5) and the patterned steel plate 2;

[0041] 3) such as Figure 2 As shown, a longitudinal steel bar support plate 7 is welded to the top surface of the patterned steel plate 2, and the longitudinal steel bar support plate 7 is aligned with the longitudinal main beam 1;

[0042] 4) such as Figure 3 As shown, the bottom reinforcement 9 is arranged as follows: First, the transverse reinforcement is installed along the longitudinal reinforcement support plate 7, and then the longitudinal reinforcement is arranged on the transverse reinforcement.

[0043] 5) such as Figure 4 As shown, a vertical support 10 is welded to the top surface of the patterned steel plate 2, and a horizontal steel bar support plate 11 is welded to the top of the vertical support 10 along the line.

[0044] 6) such as Figure 5 As shown, the top layer of steel reinforcement 12 is arranged as follows: first, longitudinal steel reinforcement is installed along the transverse steel reinforcement support plate 11, and then transverse steel reinforcement is arranged on the longitudinal steel reinforcement.

[0045] 7) Cast UHPC concrete in place within the space enclosed by the baffles (4, 5) on the patterned steel plate 2, with the pouring thickness consistent with the height of the baffles (4, 5);

[0046] 8) Once the UHPC concrete has reached its strength, the construction of the cast-in-place UHPC steel-concrete composite bridge deck is completed.

[0047] This invention features a rational structure, employing a cast-in-place UHPC steel-concrete composite. The patterned steel plate 2 bonds well with the UHPC concrete, forming a better shared load-bearing structure and avoiding problems such as fatigue defects in ordinary steel bridge decks. This invention uses formwork-free cast-in-place UHPC concrete, avoiding the complex procedures of erecting and dismantling formwork required in traditional cast-in-place construction. By using a load-bearing structure instead of traditional formwork, it generates no excess construction waste, is environmentally friendly, and facilitates standardized on-site construction, making cast-in-place construction more convenient and efficient. Furthermore, this invention uses longitudinal steel reinforcement support plates 7 and transverse steel reinforcement support plates 11 to effectively control steel reinforcement binding. Compared to the wet joint method at the rear foot of precast bridge decks, this results in better overall bridge deck integrity and more reliable quality. Simultaneously, it eliminates complex procedures such as building prefabrication yards and hoisting into place during construction, making it applicable to a wider range of scenarios.

[0048] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A formworkless cast-in-place UHPC steel-concrete composite bridge deck, characterized in that: This includes patterned steel plates welded onto the longitudinal main beams; shear studs, longitudinal reinforcement support plates, and vertical supports are welded to the top surface of the patterned steel plates. The shear studs are arranged longitudinally at corresponding positions on the longitudinal main beams. The longitudinal reinforcement support plates are used to install the transverse reinforcement in the bottom layer of reinforcement and control its spacing and the thickness of the reinforcement protective layer. The longitudinal reinforcement in the bottom layer of reinforcement is placed above the transverse reinforcement. The vertical supports are welded to the top of the transverse reinforcement support plates along the line. The transverse reinforcement support plates are used to support the installation of the longitudinal reinforcement in the top layer of reinforcement and control its spacing. The transverse reinforcement in the top layer of reinforcement is placed above the longitudinal reinforcement. Transverse stiffening ribs are welded to the bottom surface of the patterned steel plates, and baffles are welded to the sides and the upper side of the beam ends. Stiffening plates are welded between the baffles and the patterned steel plates. UHPC concrete is cast-in-place within the space enclosed by the baffles on the patterned steel plates. The plate has horizontal patterns with a height of 1-3mm and a spacing of 10mm; the stiffening plate is triangular; the longitudinal reinforcement support plate is aligned with the longitudinal main beam; the top of the longitudinal reinforcement support plate has a semi-circular groove, the diameter of which is consistent with the designed diameter and spacing of the transverse reinforcement in the bottom layer, and the height of the bottom end of the groove from the bottom end of the longitudinal reinforcement support plate is consistent with the designed concrete cover thickness of the transverse reinforcement in the bottom layer; the top of the transverse reinforcement support plate has a semi-circular groove, the diameter of which is consistent with the designed diameter and spacing of the longitudinal reinforcement in the top layer, and the height of the transverse reinforcement in the top layer from the top of the baffle is consistent with the designed concrete cover thickness of the transverse reinforcement in the top layer.

2. The construction method of the formworkless cast-in-place UHPC steel-concrete composite bridge deck as described in claim 1, characterized in that: Including steps, 1) Weld the patterned steel plate onto the longitudinal main beam, and weld transverse stiffening ribs onto the bottom surface of the patterned steel plate; 2) Weld baffles to the sides of the patterned steel plate and the upper side of the beam end, and weld stiffening plates between the baffles and the patterned steel plate; 3) Weld longitudinal steel reinforcement support plates to the top surface of the patterned steel plate, aligning the longitudinal steel reinforcement support plates with the longitudinal main beam; 4) Arrange the bottom layer of reinforcement: First, install the transverse reinforcement along the longitudinal reinforcement support plate, and then arrange the longitudinal reinforcement on the transverse reinforcement; 5) Weld vertical supports to the top surface of the patterned steel plate, and weld horizontal steel reinforcement brackets to the top of the vertical supports along the line; 6) Arrange the top layer of reinforcement: First, install the longitudinal reinforcement along the transverse reinforcement support plate, and then arrange the transverse reinforcement on the longitudinal reinforcement; 7) Cast UHPC concrete in place within the space enclosed by the baffle on the checkered steel plate, with the pouring thickness consistent with the height of the baffle. 8) Once the UHPC concrete has reached its strength, the construction of the cast-in-place UHPC steel-concrete composite bridge deck is completed.

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