Arched steel plate-inverted T-shaped steel-UHPC structure light combined bridge deck slab and construction method

Abstract

The invention discloses an arched steel plate-inverted T-shaped steel-UHPC structure light combined bridge deck slab and a construction method. The arched steel plate-inverted T-shaped steel-UHPC structure light combined bridge deck slab comprises arched steel plates, inverted T-shaped steel, reinforcing steel bars and UHPC. The inverted T-shaped steel forms an inverted T-shaped steel structure, and arch feet of the arched steel plate are lapped on steel plates on the two sides of the inverted T-shaped steel structure; a plurality of MCL-shaped open boundaries are arranged on a web plate of the inverted T-shaped steel structure, and a plurality of groups of transverse perforated steel bars are arranged in the MCL-shaped open boundaries; a transverse reinforcing steel bar is arranged between two adjacent MCL-shaped open boundaries, and a longitudinal reinforcing steel bar is erected on the transverse reinforcing steel bar; and the ultra-high performance concrete on the arched steel plate, the arched steel plate, the inverted T-shaped steel structure and the reinforcing steel bars form a combined bridge deck which is stressed together. The problem that the reinforcing steel bars are difficult to penetrate through in a PBL shearing force connecting piece can be solved, the longitudinal shearing bonding performance of the combined bridge deck slab is improved, and the cooperative work capacity of all the components is improved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a lightweight composite bridge deck with an arched steel plate-UHPC structure and a construction method thereof. Background Art

[0002] As a structural component of bridges that directly bears the wheel pressure of vehicles, the working condition of the bridge deck has a crucial impact on the safety, durability, and driving comfort of the bridge structure. However, the concrete and steel bridge decks commonly used in bridges face the following difficulties and challenges:

[0003] Concrete bridge decks have a large self-weight, limiting their own and the bridge's spanning capacity. Concrete has low tensile strength, and loads, temperature changes, concrete shrinkage, foundation deformation, and steel corrosion can easily cause cracks in the bridge deck, affecting the structure's durability. This type of bridge deck is often constructed using cast-in-place methods, requiring formwork erection and dismantling, resulting in long construction periods and traffic disruptions. Steel bridge decks have numerous intersecting longitudinal and transverse stiffening ribs and welds, making them prone to fatigue cracking under repeated vehicle dynamic loads. Furthermore, the connection between the steel bridge deck and the pavement layer is poor, making the pavement layer easily damaged. Most steel bridge deck pavements develop serious cracking, rutting, potholes, and shoving shortly after opening to traffic. These two typical defects—fatigue cracking of the steel bridge deck and the vulnerability of the steel pavement layer—seriously affect the bridge's performance and service quality, significantly increasing the bridge structure's life-cycle cost.

[0004] In response to the difficulties encountered by steel bridge decks, steel-concrete composite bridge decks have gradually gained attention and application in bridge engineering. However, existing steel-concrete composite bridge decks still have some problems: (1) In order to ensure that steel and concrete work together, shear connectors are usually set between the two; the commonly used stud shear connectors have fatigue problems, and although perforated steel plate (Perfobond Leiste, abbreviated as PBL) shear connectors have good static and fatigue performance, they have the problem of difficulty in inserting steel bars; (2) Ordinary concrete has low tensile strength, and the bridge deck is prone to cracks, which affects the corrosion resistance and durability of the bridge deck; (3) There are many welds in the steel structure part of the existing composite bridge decks, making it difficult to guarantee the construction quality and precision, and easily causing weld fatigue problems. Summary of the Invention

[0005] To address the problems associated with traditional steel-concrete composite bridge decks, this invention proposes a lightweight composite bridge deck composed of arched steel plates, U-shaped steel, and UHPC, along with its construction method.

[0006] The present invention is achieved through the following technical solutions:

[0007] This application provides a lightweight composite bridge deck with an arched steel plate-T-shaped steel-UHPC structure and a construction method, including an arched steel plate, inverted T-shaped steel, reinforcing bars and ultra-high performance concrete;

[0008] The inverted T-shaped steel forms a ⊥-shaped steel structure. Multiple sets of ⊥-shaped steel structures are arranged side by side, and multiple sets of arched steel plates are arranged side by side. Each set of arched steel plates is located between two adjacent sets of ⊥-shaped steel structures, and the arch feet of the arched steel plates rest on the steel plates on both sides of the ⊥-shaped steel structure.

[0009] Several MCL-shaped open boundaries are set on the web of the ⊥-shaped steel structure, and several sets of transverse perforated steel bars are set in the MCL-shaped open boundaries. The perforated steel bars run across the top of each set of arched steel plates and inside the MCL-shaped open boundaries of the ⊥-shaped steel structure.

[0010] Transverse reinforcement bars are laid between two adjacent MCL-shaped open boundaries on the web of the ⊥-shaped steel structure, and longitudinal reinforcement bars are laid on the transverse reinforcement bars to form a steel mesh;

[0011] The ultra-high performance concrete poured on the arched steel plate, together with the arched steel plate, the ⊥-shaped steel structure and the reinforcing steel, forms a composite bridge deck that shares the load.

[0012] To optimize the above technical solution, the specific measures also include:

[0013] The arch foot of the arched steel plate is provided with a horizontal steel plate section, which is fixedly connected to the steel plates on both sides of the ⊥-shaped steel structure.

[0014] Furthermore, the horizontal steel plate has pre-set bolt holes, and the horizontal steel plate is connected to the two side steel plates of the U-shaped steel structure by welding bolts.

[0015] Furthermore, a groove is provided between two adjacent MCL-shaped open boundaries of the ⊥-shaped steel structure, and the transverse reinforcing bars are laid in the groove.

[0016] The perforated steel bars and transverse steel bars are provided in several groups. The perforated steel bars correspond to the open boundaries of the MCL shape, and the transverse steel bars correspond to the positions between two adjacent open boundaries of the MCL shape of the ⊥ steel structure.

[0017] The longitudinal reinforcing bars are provided in several groups, and at least one group of longitudinal reinforcing bars is provided above each group of arched steel plates.

[0018] The ultra-high performance concrete is cast using an arched steel plate as a template.

[0019] Furthermore, the ⊥-shaped steel structure is a hot-rolled T-shaped steel formed in one piece or a T-shaped steel directly split from a hot-rolled H-shaped steel, and the ⊥-shaped steel structure has no weld seams.

[0020] This application also provides a construction method for a lightweight composite bridge deck with an arched steel plate-UHPC structure, characterized by the following steps:

[0021] An MCL-shaped open boundary is set on the web of the T-shaped steel;

[0022] Precast arched steel plates;

[0023] Invert the T-shaped steel to form a ⊥-shaped steel structure, and arrange them in rows according to the design spacing;

[0024] Place the arched steel plate between two rows of adjacent ⊥-shaped steel structures, so that the arch foot of the arched steel plate rests on the steel plates on both sides of the ⊥-shaped steel structure.

[0025] Connect the arch foot of the arched steel plate to the ⊥-shaped steel structure;

[0026] Perforated steel bars are placed within the open boundary of the MCL shape;

[0027] Place transverse reinforcement between the two MCL-shaped open boundaries;

[0028] Place longitudinal reinforcement bars above the transverse reinforcement bars;

[0029] Using arched steel plates as templates, ultra-high performance concrete is poured on top to form a composite bridge deck that shares the load.

[0030] Furthermore, a groove is set between two adjacent MCL-shaped open boundaries of the T-shaped steel, and transverse reinforcing bars are placed in the groove; the horizontal section of the arch foot of the arched steel plate has pre-reserved stud holes, and studs are used to connect the horizontal section of the arch foot of the arched steel plate to the ⊥-shaped steel structure.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This invention draws on the advantages of arched structures, hot-rolled ⊥-shaped steel structures, and modified clothoid (MCL) composite pin shear connectors. It combines arched steel plates, ⊥-shaped steel structures with MCL-shaped open boundaries on the web, and ultra-high performance concrete (UHPC) to form a novel composite bridge deck: an arched steel plate – ⊥-shaped steel – UHPC lightweight composite bridge deck. This invention avoids the problem of difficult steel bar insertion in PBL shear connectors, improves the longitudinal shear bonding performance of the composite bridge deck, and enhances the collaborative working ability of each component.

[0033] This invention features an open MCL-shaped boundary on the web of a U-shaped steel structure, allowing the web to replace the MCL-shaped combined pin shear connector and the flanges to replace the lower reinforcing steel bars of the bridge deck. The open MCL-shaped boundary on the web, with internal perforated reinforcing bars, provides superior connection performance with concrete compared to PBL shear connectors and traditional MCL-shaped combined pin shear connectors. The arched steel plate is connected to the U-shaped steel structure via welded studs. During the UHPC casting stage, the studs fix the arched steel plate; during service, they function as stud shear connectors. Because stud connectors are flexible, their use in conjunction with the MCL-shaped open boundary U-shaped steel structure (a rigid connector) improves the structure's ductility.

[0034] The composite bridge deck of this invention is lightweight, and the U-shaped steel structure and UHPC have high tensile strength, overcoming the problems of heavy concrete bridge decks and easy cracking of concrete. It also eliminates the formwork support and dismantling process, saving labor and shortening the construction period. The U-shaped steel structure uses T-shaped steel, which has no welds and excellent fatigue resistance. In addition, the UHPC has good connection performance with the pavement layer, which can solve the problems of fatigue cracking of steel bridge decks and easy damage of steel bridge deck pavement layers. Attached Figure Description

[0035] Figure 1 : A schematic diagram of the structure of the lightweight composite bridge deck of the present invention, which is an arched steel plate-UHPC structure.

[0036] Figure 2 : A schematic diagram of the cross-sectional structure of the lightweight composite bridge deck of the arched steel plate-UHPC structure of the present invention.

[0037] Figure 3 : A schematic diagram of the longitudinal section of the lightweight composite bridge deck of the arched steel plate-UHPC structure of the present invention.

[0038] In the diagram: 1-arched steel plate, 2-⊥-shaped steel structure, 3-ultra-high performance concrete, 4-perforated steel bar, 5-transverse steel bar, 6-longitudinal steel bar, 7-stud. Detailed Implementation

[0039] The present invention will be further described in detail below through embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All technologies implemented based on the above content of the present invention fall within the scope of the present invention.

[0040] This application provides a lightweight composite bridge deck with an arched steel plate 1-⊥-UHPC structure, such as Figure 1 As shown, it includes an arched steel plate 1, an inverted T-shaped steel, reinforcing bars, and ultra-high performance concrete 3;

[0041] The inverted T-shaped steel forms a ⊥-shaped steel structure 2. Multiple sets of ⊥-shaped steel structures 2 are arranged side by side, and multiple sets of arched steel plates 1 are arranged side by side. Each set of arched steel plates 1 is located between two adjacent sets of ⊥-shaped steel structures 2, and the arch foot of the arched steel plate 1 rests on the steel plates on both sides of the ⊥-shaped steel structure 2.

[0042] Several MCL-shaped open boundaries are set on the web of the ⊥-shaped steel structure 2. Several sets of transverse perforated steel bars 4 are set in the MCL-shaped open boundaries. The perforated steel bars 4 run transversely above each set of arched steel plates 1 and inside the MCL-shaped open boundaries of the ⊥-shaped steel structure 2, such as... Figure 3 As shown;

[0043] A transverse steel bar 5 is laid between two adjacent MCL-shaped open boundaries on the web of the ⊥-shaped steel structure 2, and a longitudinal steel bar 6 is laid on the transverse steel bar 5 to form a steel mesh.

[0044] The ultra-high performance concrete 3 poured on the arched steel plate 1, together with the arched steel plate 1, the ⊥-shaped steel structure 2 and the reinforcing bars, forms a composite bridge deck that shares the load.

[0045] The arch foot of the arched steel plate 1 is provided with a horizontal section steel plate, which is fixedly connected to the two side steel plates of the ⊥-shaped steel structure 2.

[0046] In some embodiments, pre-drilled bolt holes are made in the horizontal section steel plate, and the horizontal section steel plate is connected to the two side steel plates of the U-shaped steel structure 2 by welding bolts 7, such as... Figure 2 shown.

[0047] In some embodiments, a groove is provided between two adjacent MCL-shaped open boundaries of the ⊥-shaped steel structure 2, and the transverse reinforcing bars are laid in the groove.

[0048] The perforated steel bars 4 are provided in several groups, each corresponding to a number of MCL-shaped open boundaries.

[0049] Several sets of transverse reinforcing bars 5 are provided, each corresponding to the position between two adjacent MCL-shaped open boundaries of the ⊥-shaped steel structure 2.

[0050] The longitudinal reinforcing bars 6 are provided in several groups, and at least one group of longitudinal reinforcing bars 6 is provided above each group of arched steel plates 1.

[0051] In some embodiments, the ⊥-shaped steel structure 2 can be made of hot-rolled T-shaped steel formed in one piece or hot-rolled H-shaped steel directly split into T-shaped steel, without weld seams, and has excellent fatigue resistance.

[0052] The ultra-high performance concrete 3 of this application is cast using an arched steel plate 1 as a template.

[0053] An example of the construction method for the lightweight composite bridge deck of the arched steel plate-UHPC structure in this application is as follows:

[0054] Step 1: Set an MCL-shaped open boundary on the web of the T-shaped steel, and set a groove between two adjacent open MCL-shaped boundaries of the T-shaped steel;

[0055] Step 2: Prefabricate the arched steel plate 1 in advance, and pre-reserve stud holes in the horizontal section of the arched steel plate;

[0056] Step 3: Invert the T-shaped steel with the MCL-shaped open boundary and groove, and place it according to the design requirements;

[0057] Step 4: Place the arched steel plate 1 between the two ⊥-shaped steel structures 2 according to the design requirements, with the arch foot of the arched steel plate 1 resting on the two side steel plates of the ⊥-shaped steel structure 2.

[0058] Step 5: Use studs 7 to connect the arched steel plate to the ⊥-shaped steel structure 2;

[0059] Step 6: Place the perforated steel bar 4 in the open MCL-shaped boundary;

[0060] Step 7: Place transverse reinforcing bars 5 in the groove between the two open MCL-shaped boundaries;

[0061] Step 8: Place the longitudinal reinforcement 6 above the transverse reinforcement 5;

[0062] Step 9: Using the arched steel plate 1 as a template, pour ultra-high performance concrete 3 on it to form a composite bridge deck that shares the load.

[0063] This application draws on the advantages of arched structures, hot-rolled ⊥-shaped steel structures, and improved spiral-shaped combined pin shear connectors. It can avoid the problem of difficult steel bar insertion in PBL shear connectors, improve the longitudinal shear bonding performance of composite bridge decks, and enhance the collaborative working ability of each component.

[0064] This application employs an arched steel plate 1, a ⊥-shaped steel structure 2 with an MCL-shaped open boundary on its web, and ultra-high performance concrete 3 (UHPC) to form a lightweight composite bridge deck consisting of an arched steel plate 1, a ⊥-shaped steel structure, and a UHPC structure. An MCL-shaped open boundary is provided on the web of the ⊥-shaped steel structure 2, which can replace the MCL-shaped composite pin-shear connector. The flanges of the ⊥-shaped steel structure 2 can replace the lower reinforcing steel bars of the bridge deck. A horizontal section is provided at the arch foot of the arched steel plate 1, and pre-set stud holes are made in the horizontal section steel plate. Studs 7 are welded to the ⊥-shaped steel structure 2. Perforated reinforcing bars 4 are provided in the MCL-shaped open boundary, and transverse reinforcing bars 5 and longitudinal reinforcing bars 6 are provided on the upper part of the structure. The arched steel plate 1 is used as a template, and UHPC is poured on it to form a composite bridge deck that shares the load.

[0065] Among them, the arched steel plate 1 can be used as a formwork and construction platform for pouring UHPC during the construction phase, eliminating the need for formwork erection and dismantling, saving labor and shortening the construction period; it can participate in structural stress during the service phase; and it can be recycled after the bridge deck is removed. Compared with corrugated steel plates, the arched steel plate 1 has a stronger load-bearing capacity and a smoother line.

[0066] In addition, the arched steel plate 1 of this application is mainly used as a construction template, and the plate thickness should be 0.8 to 2 mm. The corrugated steel plate in the corrugated steel-concrete composite bridge deck is a load-bearing steel plate with a minimum thickness of 6 mm, which saves steel consumption.

[0067] The web of the ⊥-shaped steel structure 2 is provided with an MCL-shaped open boundary and perforated steel bars 4 inside. Its connection performance with concrete is better than that of PBL shear connectors and traditional MCL-shaped combined pin shear connectors. It can further improve the longitudinal shear bonding performance of the composite bridge deck and improve the collaborative working ability of each component. The MCL-shaped open boundary is conducive to the insertion and placement of steel bars during construction, avoiding the problem of difficult steel bar insertion that exists with PBL shear connectors.

[0068] This application uses ultra-high performance concrete (UHPC), which has the advantages of ultra-high strength, ultra-high toughness, and ultra-long durability. It can further reduce the self-weight of the bridge deck and the bridge, improve the span capacity of the bridge deck and the bridge, and improve the load-bearing capacity and durability of the bridge deck.

[0069] In some embodiments, the arched steel plate 1 and the ⊥-shaped steel structure 2 are connected by welded studs 7. During the ultra-high performance concrete 3 pouring stage, the studs 7 serve to fix the arched steel plate 1. During the service stage, the studs 7 can be used as stud shear connectors. Since the stud 7 connector is a flexible connector, it can be used in conjunction with the rigid connector ⊥-shaped steel structure 2 with MCL-shaped open boundary to improve the ductility of the structure.

[0070] It should be noted that the studs 7 in the novel composite bridge deck of this application are mainly used to fix the arched steel plate 1. Compared with the corrugated steel-concrete composite bridge deck using stud shear connectors, the number of studs is greatly reduced, thus improving the fatigue problem of studs.

[0071] The composite bridge deck is lightweight, and the U-shaped steel structure 2 and ultra-high performance concrete 3 have high tensile strength, overcoming the problems of heavy concrete bridge deck and easy cracking of concrete. It also eliminates the formwork erection and dismantling process, saving labor and shortening the construction period. The U-shaped steel structure 2 uses T-shaped steel, which is seamless and has excellent fatigue resistance. The ultra-high performance concrete 3 has good connection performance with the pavement layer, which can solve two typical problems: fatigue cracking of steel bridge deck and easy damage of steel bridge deck pavement layer.

[0072] Compared with the emerging steel-UHPC composite bridge deck, this application significantly reduces the number of welds on the joint surface, and the web of the L-shaped steel is set with an MCL-shaped open boundary, which has better connection performance with concrete than PBL shear connectors and traditional MCL-shaped composite pin shear connectors, while avoiding the problem of difficult reinforcement insertion that exists in PBL shear connectors.

[0073] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the present invention and based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck, characterized by: It includes arched steel plates, inverted T-shaped steel, rebar and ultra-high performance concrete; The inverted T-shaped steel forms a ⊥-shaped steel structure, multiple groups of ⊥-shaped steel structures are arranged side by side, multiple groups of arched steel plates are arranged side by side, each group of arched steel plates is arranged between two adjacent groups of ⊥-shaped steel structures, and the arch feet of the arched steel plates are placed on the steel plates on both sides of the ⊥-shaped steel structure; A plurality of MCL-shaped open boundaries are arranged on the web of the ⊥-shaped steel structure, and a plurality of groups of transverse perforated steel bars are arranged in the MCL-shaped open boundaries, wherein the perforated steel bars are transversely arranged above each group of arched steel plates and inside the MCL-shaped open boundaries of the ⊥-shaped steel structure; Transverse reinforcements are arranged between two adjacent MCL-shaped open boundaries on the web of the ⊥-shaped steel structure, and longitudinal reinforcements are arranged on the transverse reinforcements to form a reinforcement mesh; The ultra-high performance concrete cast on the arched steel plate forms a composite bridge deck that bears joint force with the arched steel plate, ⊥-shaped steel structure and steel bars.

2. The arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to claim 1 is characterized by: The arch foot of the arched steel plate is provided with a horizontal section steel plate, and the horizontal section steel plate is fixedly connected to the steel plates on both sides of the ⊥-shaped steel structure.

3. The arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to claim 2 is characterized by: The horizontal section steel plate is pre-set with bolt holes, and the horizontal section steel plate is connected to the steel plates on both sides of the ⊥-shaped steel structure through the bolts.

4. The arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to claim 1 is characterized by: A groove is provided between two adjacent MCL-shaped open boundaries of the ⊥-shaped steel structure, and the transverse steel bars are arranged in the groove.

5. The arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to claim 1 is characterized by: The perforated steel bars and transverse steel bars are respectively provided with several groups, the perforated steel bars correspond to the MCL-shaped open boundaries, and the transverse steel bars correspond to the position between two adjacent MCL-shaped open boundaries of the ⊥-shaped steel structure.

6. The arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to claim 1, characterized in that: The longitudinal steel bars are provided in a plurality of groups, and at least one group of longitudinal steel bars is provided above each group of arched steel plates.

7. The arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to claim 1 is characterized by: The ⊥-shaped steel structure is a T-shaped steel formed by hot rolling in one step or a T-shaped steel directly split from a hot-rolled H-shaped steel, and the ⊥-shaped steel structure has no weld.

8. The construction method of the arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to any one of claims 1 to 7, characterized in that: The following steps are involved: Set up MCL-shaped open boundaries on the web of the T-steel; Prefabricated arched steel panels; Invert the T-shaped steel to form a ⊥-shaped steel structure, and place them in rows according to the designed spacing; Place the arched steel plate between two rows of adjacent ⊥-shaped steel structures so that the arch foot of the arched steel plate rests on the steel plates on both sides of the ⊥-shaped steel structure; Connect the arch foot of the arched steel plate to the ⊥-shaped steel structure; Place perforated reinforcement within the MCL-shaped open boundary; Place transverse reinforcement between the two MCL-shaped open boundaries; Place longitudinal reinforcement above the transverse reinforcement; The arched steel plate is used as a template, and ultra-high performance concrete is poured on it to form a composite bridge deck that bears the same force.

9. The construction method of the arched steel plate-⊥-shaped steel-UHPC structure lightweight composite bridge deck according to claim 8, characterized in that: A groove is set between two adjacent MCL-shaped open boundaries of the T-steel, and transverse steel bars are placed in the groove; bolt holes are reserved in advance for the horizontal section steel plate of the arch foot of the arch steel plate, and the horizontal section steel plate of the arch foot of the arch steel plate is connected to the ⊥-shaped steel structure by bolts.

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