Arch type T beam bridge deck continuous structure with tendon

Abstract

The utility model belongs to the technical field of highway bridge structure design, concretely relates to the continuous structure of arch type T beam bridge floor with tendon. The structure includes support, simply supported T beam, T beam bridge deck upper edge steel bar net, bridge floor continuous lower edge steel bar net, concrete cast-in-situ layer, cold-rolled ribbed steel bar net, steel plate bottom die, waterproof layer and asphalt concrete bridge deck layer; The simply supported T beam is arranged above the support; The simply supported T beam is provided with T beam reserved notched; The steel plate bottom die is placed on the T beam reserved notched; The concrete cast-in-situ layer is poured above the steel plate bottom die; The cold-rolled ribbed steel bar net is arranged in the upper layer of the concrete cast-in-situ layer; The bridge floor continuous lower edge steel bar net is arranged in the lower layer of the concrete cast-in-situ layer and is connected with the T beam bridge deck upper edge steel bar net through welding; The T beam bridge deck upper edge steel bar net is arranged above the simply supported T beam; The waterproof layer is attached to the upper surface of the concrete cast-in-situ layer; The asphalt concrete bridge deck layer is arranged above the waterproof layer.

Description

Technical Field

[0001] This utility model belongs to the field of highway bridge structural design technology, specifically relating to a reinforced arch-shaped T-beam bridge deck continuous structure. Background Technology

[0002] A continuous bridge deck structure is formed by connecting steel bars or plates on the bridge deck at the top of the piers. The continuous bridge deck structure has the advantages of continuous beams (slabs) in saving materials and ensuring smooth traffic flow. It also has the characteristics of prefabricated simply supported structures in saving supports and formwork, and can speed up the progress of the project.

[0003] Existing patent application CN202211212218.4 discloses a composite arch bridge deck continuous structure and its construction method for simply supported beam bridges. The arch steel plate is fixed with bolts at the arch foot and welded reinforcing bars, and then concrete is poured on top to form a continuous bridge deck structure. However, the drawback of this structure is that the bolted joints at the arch foot are easily damaged, resulting in poor durability.

[0004] Existing patent application CN202410877813.2 also discloses a continuous bridge deck structure for a simply supported beam bridge. This scheme mainly uses flexible components, supporting steel plates, and ultra-high performance concrete to form a continuous bridge deck structure. However, the shortcomings of the above structure are that the ultra-high performance concrete used is expensive, and it cannot avoid the large tensile stress at the top of the continuous bridge deck caused by the beam end corners.

[0005] In summary, both of the above-mentioned existing technologies are relatively complex to construct and are not well adapted to the precast simply supported T-beams that are widely used in highway engineering.

[0006] Therefore, it is very important to design a reinforced arch-shaped T-beam bridge deck continuous structure that can achieve long-durability bridge deck connection of simply supported T-beams by using conventional materials and conforming well to existing mature construction methods, through appropriate reinforcement and optimized arch-shaped cross-section design. Utility Model Content

[0007] This invention aims to overcome the problems of existing bridge deck continuous structure designs, which are complex to construct and not well-suited for the widely used precast simply supported T-beams in highway engineering. It provides a moderately reinforced arched T-beam bridge deck continuous structure that can achieve long-durability bridge deck connection of simply supported T-beams by using conventional materials and conforming well to existing mature construction methods, through appropriate reinforcement and optimized arched section design.

[0008] To achieve the above-mentioned objectives, this utility model adopts the following technical solution: The reinforced arch-shaped T-beam bridge deck continuous structure includes supports, simply supported T-beams, upper edge steel mesh of the T-beam bridge deck, lower edge steel mesh of the continuous bridge deck, cast-in-place concrete layer, cold-rolled ribbed steel mesh, steel plate bottom formwork, waterproof layer and asphalt concrete bridge deck layer. The simply supported T-beam is located above the support; the simply supported T-beam has a reserved slot; the steel plate bottom formwork is placed on the reserved slot; the cast-in-place concrete layer is poured above the steel plate bottom formwork; the cold-rolled ribbed steel mesh is located inside the upper layer of the cast-in-place concrete layer; the continuous lower edge steel mesh of the bridge deck is located inside the lower layer of the cast-in-place concrete layer and is welded to the upper edge steel mesh of the T-beam bridge deck; the upper edge steel mesh of the T-beam bridge deck is located inside the upper part of the simply supported T-beam; the waterproof layer is attached to the upper surface of the cast-in-place concrete layer; the asphalt concrete bridge deck layer is located above the waterproof layer.

[0009] Preferably, the depth and width of the reserved slot on one side of the T-beam are 6cm × 80cm.

[0010] Preferably, the steel plate bottom mold is arc-shaped; the steel plate bottom mold has patterns; and the surface of the steel plate bottom mold is hot-dip galvanized.

[0011] Preferably, the thickness of the steel plate bottom mold is 6mm.

[0012] Preferably, the continuous lower layer of steel reinforcement mesh on the bridge deck includes several steel bars with a diameter of 10mm, and the spacing between two adjacent steel bars in both the longitudinal and transverse directions is 10cm.

[0013] Preferably, the cast-in-place concrete layer is made of C50 concrete; the thickness of the cast-in-place concrete layer is 10cm.

[0014] Preferably, the cold-rolled ribbed steel mesh includes several steel bars with a diameter of 10mm, and the spacing between two adjacent steel bars in both the longitudinal and transverse directions is 10cm.

[0015] Preferably, the thickness of the asphalt concrete bridge deck layer is 10cm.

[0016] Compared with the prior art, the advantages of this utility model are: (1) High compatibility with T-beam structure, which is conducive to improving the standardization of the project: This utility model can reliably connect with the T-beam without special treatment. It is an "embedded development" based on the existing T-beam structure, which is conducive to improving the standardization of the actual project; (2) Quality reliability and long durability: The optimized arch bridge deck continuous structure can significantly reduce the stress concentration at the bridge deck continuity caused by the beam end corner of the T-beam. Combined with appropriate upper and lower layer reinforcement and lower edge patterned steel plate composite stress, the durability of the bridge deck continuity is improved, the probability of reflective cracks in the asphalt layer in the continuous range of the bridge deck is reduced, the frequent maintenance and repair of the bridge deck continuity is avoided, the impact of the continuous maintenance construction of the bridge deck on public travel is reduced, and it has good social benefits; (3) Construction safety and convenience: This utility model uses arc-shaped steel plate as the construction bottom formwork, which can avoid the problem of grout leakage during the concrete pouring process. This significantly improves the safety and convenience of the construction process; the steel plate is simply supported in the slot of the adjacent T beam, eliminating the need for complex on-site positioning and anchoring procedures, simplifying the construction process and accelerating the construction speed; (4) Wide applicability: The structure of this utility model is simple, which makes it applicable to T beams with different spans and beam heights. This versatility allows this utility model to adapt to various engineering scenarios and needs, and after appropriate adjustments to the structural details, it can also be applied to hollow slabs, small box girders, steel-concrete composite beams and other bridge types, with a wide range of applications; (5) Economical and affordable: All components used in this utility model are common materials on the market, easy to obtain and low in cost, without the need to use expensive special materials such as UHPC and ECC; This makes the entire structure not only ensure the effect but also have good economic efficiency, reducing engineering costs and increasing the return on investment. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram used to show the cross-section along the longitudinal direction in the continuous reinforced arch-shaped T-beam bridge deck structure of this utility model. Figure 2 for Figure 1 A structural schematic diagram of the transverse cross-section of the bridge at point AA; Figure 3 for Figure 1 A structural schematic diagram of the transverse cross-section of the bridge at point BB.

[0018] In the diagram: 1. Support; 2. Simply supported T-beam; 3. T-beam reserved slot; 4. Upper edge steel mesh of T-beam bridge deck; 5. Continuous lower edge steel mesh of bridge deck; 6. Cast-in-place concrete layer; 7. Cold-rolled ribbed steel mesh; 8. Steel plate bottom formwork; 9. Waterproof layer; 10. Asphalt concrete bridge deck layer. Detailed Implementation

[0019] To more clearly illustrate the embodiments of this utility model, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0020] Example: like Figures 1 to 3 As shown, this utility model provides a continuous arch-shaped T-beam bridge deck structure with appropriate reinforcement, including a support 1, a simply supported T-beam 2, a steel mesh on the upper edge of the T-beam bridge deck 4, a continuous steel mesh on the lower edge of the bridge deck 5, a cast-in-place concrete layer 6, a cold-rolled ribbed steel mesh 7, a steel plate bottom formwork 8, a waterproof layer 9, and an asphalt concrete bridge deck layer 10. The simply supported T-beam is located above the support; the simply supported T-beam has a T-beam pre-reserved slot 3; the steel plate bottom formwork is placed on the T-beam pre-reserved slot; the cast-in-place concrete layer is poured above the steel plate bottom formwork; the cold-rolled ribbed steel mesh is located inside the upper layer of the cast-in-place concrete layer; the continuous lower edge steel mesh of the bridge deck is located inside the lower layer of the cast-in-place concrete layer and is welded to the upper edge steel mesh of the T-beam bridge deck; the upper edge steel mesh of the T-beam bridge deck is located inside the upper part of the simply supported T-beam; the waterproof layer is attached to the upper surface of the cast-in-place concrete layer; the asphalt concrete bridge deck layer is located above the waterproof layer.

[0021] Furthermore, the reserved slots on the T-beams are a fundamental part of the continuous arch bridge deck structure of the T-beams. During the prefabrication of the T-beams, slots are reserved at the beam ends where the bridge deck is continuous. The depth and width of the slots on one side are 6cm × 80cm. The reserved slots provide space to ensure that the thickness of the arch plate of the continuous bridge deck structure is not less than 10cm, and facilitate the welding connection between the upper edge of the steel mesh of the T-beam bridge deck and the lower edge of the steel mesh of the continuous arch bridge deck.

[0022] The groove depth can be adjusted according to the beam and slab conditions. The recommended depth range is 6cm-15cm. When using a larger groove depth, the lower edge patterned steel plate can be simplified to a 1cm thick bamboo plywood.

[0023] Furthermore, the steel plate bottom mold is generally arc-shaped; the steel plate bottom mold has patterns; and the surface of the steel plate bottom mold is hot-dip galvanized. The arc-shaped aluminum-zinc galvanized patterned steel plate serves as the bottom mold for continuous concrete pouring of the bridge deck, and also participates in the continuous stress of the arched bridge deck. The steel plate pattern helps to enhance the shear force transfer between the steel plate and the concrete, and the hot-dip galvanization of the steel plate surface helps to improve the corrosion resistance of the steel plate. Moreover, the steel plate of this utility model does not require special bolting or welding fixation, and only needs to be simply supported in the reserved slot of the T-beam, which is convenient for construction and highly operable. Taking into account the cost savings of materials and the stress requirements of the steel plate during construction and operation, the thickness of the steel plate is determined to be 6mm.

[0024] Furthermore, by welding the lower layer of the continuous bridge deck reinforcement mesh to the upper edge of the T-beam bridge deck reinforcement mesh, the crack resistance of the continuous bridge deck concrete can be effectively improved, which is beneficial to the overall stress distribution of the continuous bridge deck structure and avoids weak stress areas at the junction of the continuous bridge deck and the main T-beam. Taking into account the stress requirements of the lower edge of the continuous bridge deck while avoiding excessive reinforcement that would affect the concrete pouring quality, the lower layer reinforcement mesh uses 10mm diameter steel bars, arranged at a spacing of 10cm × 10cm in both the longitudinal and transverse directions.

[0025] Furthermore, the cast-in-place concrete layer uses C50 concrete; the thickness of the cast-in-place concrete layer is 10cm. The 10cm thick C50 concrete cast-in-place layer is the most commonly used T-beam concrete pavement scheme in actual engineering. The continuous bridge deck structure of this utility model can be constructed simultaneously with the cast-in-place layer without introducing additional complex processes, and it has a high degree of compatibility with the existing T-beam construction scheme.

[0026] Furthermore, in accordance with the principle of appropriate reinforcement, no other thick steel bars are introduced into the continuous upper edge of the arch bridge deck. Instead, only the cold-rolled ribbed steel mesh in the C50 concrete cast-in-place layer is retained. The diameter of the steel bars is 10mm and the spacing between the steel bars is 10cm in both directions. The reinforcement is maintained within a continuous 2m range of the bridge deck to enhance the crack resistance of the upper edge of the continuous bridge deck structure.

[0027] The diameter of the longitudinal reinforcement bars in the upper and lower layers can be increased to 12mm-16mm to better meet the durability requirements of T-beams with spans of 40m or more.

[0028] Furthermore, the thickness of the asphalt concrete bridge deck layer is 10cm. The asphalt concrete bridge deck layer is poured after the completion of the C50 concrete cast-in-place layer, the bridge deck continuity, the bridge railings, etc., and it is laid and compacted continuously and completely at the bridge deck continuity points to ensure driving comfort.

[0029] The specific implementation process of this utility model of a reinforced arch-shaped T-beam bridge deck continuous structure is as follows: Step 1: Determine the depth and width of the reserved slot in the T-beam, and the diameter of the cold-rolled ribbed steel mesh for the bridge deck pavement and the continuous lower edge steel bars of the bridge deck based on the calculation results of the simply supported T-beam; Step 2: Precast the simply supported T-beams. During precasting, leave a T-beam pre-reserved slot at the beam end. Note that the upper edge reinforcement of the T-beam bridge deck must extend out of the slot.

[0030] Step 3: Erect the simply supported T-beam onto the support and pour the wet joint of the beam and slab.

[0031] Step 4: Place the arc-shaped aluminum-zinc patterned steel plate bottom formwork in the reserved slot of the T-beam, and weld the continuous lower edge steel mesh of the bridge deck to the upper edge steel mesh of the T-beam bridge deck.

[0032] Step 5: Lay out the cold-rolled ribbed steel mesh for the bridge deck pavement. It should be a single continuous piece within a continuous 2m range on the bridge deck. Pay attention to the alignment of the upper and lower transverse steel bars to leave sufficient space for concrete vibration.

[0033] Step 6: Pour a 10cm thick C50 concrete cast-in-place layer, ensuring that the concrete is vibrated to a dense compaction and that the coarse aggregate is evenly distributed throughout the continuous bridge deck area. After pouring, do not remove the arc-shaped galvanized steel plate bottom formwork, as it participates in the stress distribution of the continuous arch bridge deck structure.

[0034] Step 7: Construct the subsequent bridge railings, waterproof layer, and 10cm thick asphalt concrete bridge deck in sequence.

[0035] This utility model proposes a practical and cost-effective continuous T-beam bridge deck structure scheme. Through simplifying the construction process, improving construction safety, appropriately increasing reinforcement, enhancing applicability, and a unique design that closely matches the T-beam structure, it represents an important practical innovation in the technology of continuous durable bridge decks for simply supported bridges.

[0036] This invention solves the long-standing problem of ensuring concrete pouring quality during continuous on-site construction of bridge decks by appropriately adjusting the reinforcement of the continuous concrete. The bridge deck of this invention uses a 6mm thick patterned steel plate as the construction formwork, which, together with the reinforced concrete above it, forms a composite load-bearing structure, greatly improving the durability and ease of construction of the arched bridge deck.

[0037] The above description is only a detailed explanation of the preferred embodiments and principles of this utility model. For those skilled in the art, there may be changes in the specific implementation methods based on the ideas provided by this utility model, and these changes should also be considered within the protection scope of this utility model.

Claims

1. A continuously reinforced arch-shaped T-beam bridge deck structure, characterized in that, It includes bearings, simply supported T-beams, upper edge steel mesh of T-beam bridge deck, continuous lower edge steel mesh of bridge deck, cast-in-place concrete layer, cold-rolled ribbed steel mesh, steel plate bottom formwork, waterproof layer and asphalt concrete bridge deck layer. The simply supported T-beam is located above the support; the simply supported T-beam has a reserved slot; the steel plate bottom formwork is placed on the reserved slot; the cast-in-place concrete layer is poured above the steel plate bottom formwork; the cold-rolled ribbed steel mesh is located inside the upper layer of the cast-in-place concrete layer; the continuous lower edge steel mesh of the bridge deck is located inside the lower layer of the cast-in-place concrete layer and is welded to the upper edge steel mesh of the T-beam bridge deck; the upper edge steel mesh of the T-beam bridge deck is located inside the upper part of the simply supported T-beam; the waterproof layer is attached to the upper surface of the cast-in-place concrete layer; the asphalt concrete bridge deck layer is located above the waterproof layer.

2. The continuously reinforced arch-shaped T-beam bridge deck structure according to claim 1, characterized in that, The T-beam has a pre-reserved slot with a single-sided depth and width of 6cm × 80cm.

3. The continuously reinforced arch-shaped T-beam bridge deck structure according to claim 1, characterized in that, The steel plate bottom mold is generally arc-shaped; the steel plate bottom mold has patterns; the surface of the steel plate bottom mold is hot-dip galvanized.

4. The continuously reinforced arch-shaped T-beam bridge deck structure according to claim 3, characterized in that, The thickness of the steel plate bottom mold is 6mm.

5. The continuously reinforced arch-shaped T-beam bridge deck structure according to claim 1, characterized in that, The continuous lower layer of steel reinforcement mesh on the bridge deck includes several steel bars with a diameter of 10mm; the spacing between two adjacent steel bars is 10cm in both the longitudinal and transverse directions.

6. The continuously reinforced arch-shaped T-beam bridge deck structure according to claim 1, characterized in that, The cast-in-place concrete layer is made of C50 concrete; the thickness of the cast-in-place concrete layer is 10cm.

7. The continuously reinforced arch-shaped T-beam bridge deck structure according to claim 1, characterized in that, The cold-rolled ribbed steel mesh includes several steel bars with a diameter of 10mm, and the spacing between two adjacent steel bars is 10cm in both the longitudinal and transverse directions.

8. The continuously reinforced arch-shaped T-beam bridge deck structure according to claim 1, characterized in that, The thickness of the asphalt concrete bridge deck layer is 10cm.

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