A steel simply supported beam bridge prefabricated modular deck continuous device and pier top seamless construction method

Abstract

The application relates to a steel simply supported beam bridge prefabricated modular bridge deck continuous device and a pier top seamless construction method, which comprises an L-shaped rib, a top surface connecting steel plate, a side surface connecting steel plate, double-arch steel pipes, prestressed tendons, anchorage devices, connecting steel bars, structural steel bars and hexagonal bolts; the prestressed tendons are anchored by the anchorage devices after being tensioned at intervals between the horizontal two sides of the double-arch steel pipes; the front and rear ends of the double-arch steel pipes are welded with the top surface connecting steel plates and are welded with the connecting steel bars on the sides; the double-arch steel pipes are arranged on a cement mortar leveling layer on the upper surface of a main beam and are transversely spliced through the top surface connecting steel plates, the side surface connecting steel plates and the hexagonal bolts. The application has the beneficial effects that the double-arch structure is adopted at the beam joint, the upper part of the double-arch steel pipes can be better compressed when the upper part of the main beam is deformed in tension, the safety coefficient of the double-arch structure is greatly increased compared with that of a single-arch structure, and the double-arch structure can better resist the deformation influence caused by temperature stress.

Description

Technical Field

[0001] This invention relates to the field of seamless construction of steel simply supported beam bridge pier tops, and more specifically, to a prefabricated modular bridge deck continuous device and a seamless construction method for steel simply supported beam bridge pier tops. Background Technology

[0002] Bridges generally refer to structures erected over rivers, lakes, and seas to allow vehicles and pedestrians to pass smoothly. Among existing bridges, small- to medium-span simply supported beam bridges are the most common. However, traditional simply supported bridges, due to the presence of expansion joints, are prone to problems such as approach slab settlement, frequent maintenance, and water seepage. Continuous deck structures for simply supported beam bridges not only have simpler load-bearing capacity and are easier to construct, but also improve driving comfort, thus greatly meeting the needs of bridge development and social progress. Therefore, continuous deck structure technology has continuously advanced and developed rapidly. However, this technology still needs further development, especially for continuous deck devices on steel structure bridges. Besides addressing problems such as fatigue cracking of the bridge deck and frequent damage to the asphalt pavement, research is needed on devices that can prevent concrete cracking at beam joints caused by main beam rotation and can be prefabricated and assembled on-site to shorten the construction period. From an economic and practical perspective, such devices are simple to install and can be prefabricated and assembled on-site to ensure quality, safety, and reliability.

[0003] However, conventional bridge deck continuous structures have the following three technical problems:

[0004] 1. Ordinary continuous bridge deck structures are prone to structural damage. The continuous structure of steel bridge decks is subject to complex stresses. When the main beam is subjected to bending moment and the beam end tilts and rotates upward, the upper concrete of the continuous bridge deck at the beam joint is subjected to tension and cracks, while the lower concrete is squeezed by the main beam, leading to concrete cracking or even concrete spalling, which seriously affects traffic safety.

[0005] 2. If concrete cracks occur at the beam joints of ordinary continuous bridge deck structures, it is difficult to deal with. After dismantling, on-site reconstruction takes a long time, the maintenance cost is high, and the road closure time for maintenance is long, which greatly affects traffic.

[0006] 3. Conventional continuous bridge deck structures require on-site construction, which is prone to damage due to poor construction and low material durability, affecting driving comfort and causing rainwater erosion of the piers, impacting the durability of the substructure and increasing maintenance costs. Furthermore, conventional continuous bridge decks have problems with transverse splicing; for example, hinge joints in the main bridge beams can easily lead to shear failure, becoming weak points in the bridge deck structure. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a prefabricated modular bridge deck continuous device and a seamless construction method for pier tops of steel simply supported beam bridges.

[0008] Firstly, a prefabricated modular bridge deck continuous device for simply supported steel beam bridges is provided, comprising:

[0009] L-shaped ribs, top connecting steel plate, side connecting steel plate, double arch steel pipe, prestressed tendons, anchorages, connecting steel bars, structural steel bars and hexagonal bolts;

[0010] The double-arch steel pipe is formed by cold bending of rectangular steel pipes and extrusion of the middle section; the prestressed tendons are tensioned at intervals between the horizontal sides of the double-arch steel pipe and then anchored with anchors; four L-shaped ribs are welded to the upper surface of the double-arch steel pipe; top connecting steel plates are welded to the front and rear ends of the double-arch steel pipe and connecting steel bars are welded to the sides; the double-arch steel pipe is placed on the cement mortar leveling layer on the upper surface of the main beam and is horizontally spliced ​​with hexagonal bolts through the top connecting steel plates and side connecting steel plates; four waist-shaped holes are reserved at intervals at both ends of the bottom surface of the double-arch steel pipe, the waist-shaped holes coincide with the reserved holes in the main beam and are connected with hexagonal bolts; the connecting steel bars overlap with the structural steel bars, and the internal space of the double-arch steel pipe is filled with waterproof foam material.

[0011] Preferably, the L-shaped ribs are welded to the upper surface of the double-arch steel pipe using fillet welds, the L-shaped ribs are symmetrically arranged, and holes are punched on the sides of the L-shaped ribs.

[0012] Preferably, both the top connecting steel plate and the side connecting steel plate have oblong holes for connection with hexagonal bolts.

[0013] Preferably, the upper part of the double-arch steel pipe is an inverted arch, and the lower part is a straight arch.

[0014] Preferably, the arch bending angle of the double-arch steel pipe is determined according to a quadratic parabola.

[0015] Preferably, the yield strength of the double-arch steel pipe is greater than the yield strength of the top connecting steel plate and the side connecting steel plate.

[0016] Preferably, the prestressed tendons include steel wires, steel strands, and reinforcing bars.

[0017] Preferably, the length of the waist-shaped holes reserved at both ends of the double-arch steel pipe and on the main beam is twice the diameter of the hexagonal bolts, and the hexagonal bolts are arranged in the middle of the holes.

[0018] Preferably, a thick layer of epoxy resin is applied to the cement mortar leveling layer of the main beam, and then an asphalt felt is laid on top of it.

[0019] Secondly, a construction method for a prefabricated modular bridge deck continuous device for a simply supported steel beam bridge as described in the first aspect is provided, including:

[0020] Step 1: First, the rectangular steel pipe is cold-bent into a double-arch steel pipe in the factory;

[0021] Step 2: Weld the L-shaped ribs to the top surface of the double-arch steel pipe, and also weld the top connecting steel plate to both ends of the top surface of the double-arch steel pipe;

[0022] Step 3: After tensioning the prestressed tendons, anchor them to both sides of the double-arch steel pipe with anchors, and weld the connecting steel bars to both sides of the double-arch steel pipe; reserve waist-shaped holes at both ends of the sides of the double-arch steel pipe, and also reserve waist-shaped holes on the bottom surface of the double-arch steel pipe to form a double-arch steel pipe prefabrication module, and prefabricate the side connecting steel plates in advance.

[0023] Step 4: Place a double-arch steel pipe prefabricated module on the cement mortar leveling layer of the main beam, aligning its reserved waist-shaped hole with the reserved waist-shaped hole on the main beam, and connect it with hexagonal bolts.

[0024] Step 5: Position the first double-arch steel pipe prefabricated module and set the line. Align the remaining double-arch steel pipe prefabricated modules laterally with the previous module, align the waist-shaped holes of the top connecting steel plate with the first module, and connect them with hexagonal bolts. Then align the waist-shaped holes reserved on the bottom surface of the double-arch steel pipe prefabricated module with the reserved waist-shaped holes on the main beam and connect them with hexagonal bolts.

[0025] Step 6: Overlap and fix the connecting steel bars with the original steel bars, fill the inside of the double-arch steel pipe with waterproof foam material, and finally pour the concrete pavement layer.

[0026] The beneficial effects of this invention are:

[0027] 1. From the perspective of the structural features of this invention, the double-arch structure adopted at the beam joint allows the upper part of the double-arch steel pipe to be better compressed when the upper part of the main beam is subjected to tensile deformation. Furthermore, due to the effect of the continuous layer of the bridge deck and the force transmission effect of the connecting steel bars, the influence of the upper part of the main beam on the double-arch steel pipe will not be directly transmitted through the contact surface, but will be transmitted through the connecting steel bars, and will act indirectly on the double-arch steel pipe, so that the concrete is indirectly stressed, thereby reducing concrete cracking. Moreover, since the lower arch frees up space, it can further reduce the damage to the concrete caused by the main beam rotating under the action of bending moment. In addition, the safety factor of the double-arch structure is greatly increased compared with the single-arch structure, and it is more resistant to the deformation effect caused by temperature stress.

[0028] 2. From the perspective of the old bridge renovation of this invention, during the construction process, it is only necessary to remove the original device and connect the connecting steel bars on both sides for a certain length to install this device. This device can be prefabricated by processing and producing it in the factory. During construction, only the mechanical connection of hexagonal bolts and connecting steel bars is required to complete the construction, which greatly reduces the construction time, reduces the road closure time, and minimizes the impact on traffic.

[0029] 3. From the perspective of new bridge construction, prefabrication can save on-site construction time, avoid the decline in construction quality due to environmental and weather factors, and allow for early detection of the quality of the device, such as the quality of concrete curing, the welding quality of the steel structure, the application quality of anti-corrosion coating, and the accuracy of the design dimensions, which greatly ensures the quality and safety of the device. Attached Figure Description

[0030] Figure 1 A front view of the prefabricated modular bridge deck continuous assembly for a simply supported steel beam bridge.

[0031] Figure 2 Left view of the prefabricated modular bridge deck continuous device for a simply supported steel beam bridge;

[0032] Figure 3 A partially enlarged view of a prefabricated modular bridge deck continuous device for a simply supported steel beam bridge.

[0033] Figure 4 Another enlarged view of the prefabricated modular bridge deck continuous device for a simply supported steel beam bridge;

[0034] Figure 5 A diagram illustrating the stress mechanism of a prefabricated modular bridge deck continuous device for a simply supported steel beam bridge.

[0035] Figure 6 An application scenario diagram of a prefabricated modular bridge deck continuous device for a simply supported steel beam bridge;

[0036] Explanation of reference numerals in the attached drawings: 1. L-shaped rib, 2. Top connecting steel plate, 3. Side connecting steel plate, 4. Double arch steel pipe, 5. Prestressed tendon, 6. Anchor, 7. Connecting steel bar, 8. Structural steel bar, 9. Hexagonal bolt, 10. Main beam, 11. Double arch steel pipe prefabricated module. Detailed Implementation

[0037] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0038] Example 1:

[0039] A prefabricated modular bridge deck continuous device for simply supported steel beam bridges, such as Figures 1 to 4 As shown, it includes:

[0040] 1. L-shaped rib, top connecting steel plate, 2. side connecting steel plate, 3. double arch steel pipe, 4. prestressed tendon, 5. anchor, 6. connecting steel bar, 7. structural steel bar, 8. hexagonal bolt, 9.

[0041] Among them, the double-arch steel pipe 4 is a rectangular steel pipe that has been cold-folded and extruded in the middle; the prestressed tendons 5 are tensioned between the horizontal sides of the double-arch steel pipe 4 at intervals and then anchored with anchors 6; four L-shaped ribs 1 are welded on the upper surface of the double-arch steel pipe 4; the front and rear ends of the double-arch steel pipe 4 are welded with top connecting steel plates 2 and connecting steel bars 7 are welded on the sides; the double-arch steel pipe 4 is placed on the cement mortar leveling layer on the upper surface of the main beam 10 and is spliced ​​with hexagonal bolts 9 through the top connecting steel plates 2 and the side connecting steel plates 3; four waist-shaped holes are reserved at intervals on the bottom ends of the double-arch steel pipe 4, the waist-shaped holes coincide with the holes reserved in the main beam 10 and are connected with hexagonal bolts 9; the connecting steel bars 7 overlap with the structural steel bars 8, and the internal space of the double-arch steel pipe 4 is filled with waterproof foam material. The aforementioned prefabricated modular bridge deck continuous device for simply supported steel beam bridges is axisymmetric and has a certain protective ability against bending moment on the main beam, as well as a certain longitudinal slippage ability against deformation caused by temperature.

[0042] Four L-shaped ribs 1 are welded to the upper surface of the double-arch steel pipe 4 using fillet welds. The L-shaped ribs 1 are arranged symmetrically, and holes are punched on the side of the L-shaped ribs 1 to increase their interaction with the concrete and improve the shear resistance of the device.

[0043] Both the top connecting steel plate 2 and the side connecting steel plate 3 have oblong holes for connection with hexagonal bolts 9, allowing for a certain amount of vertical movement.

[0044] The upper part of the double-arch steel pipe 4 is an inverted arch, and the lower part is a straight arch.

[0045] The parameters of the arch structure can be determined according to the quadratic parabola. For example, the arch bending angle can be determined according to the quadratic parabola.

[0046] The yield strength of the double-arch steel pipe 4 is greater than that of the spliced ​​steel plate, namely the top connecting steel plate 2 and the side connecting steel plate 3.

[0047] Prestressed tendons 5 include steel wires, steel strands, and reinforcing bars.

[0048] The length of the waist-shaped holes reserved at both ends of the double-arch steel pipe 4 and on the main beam is twice the diameter of the hexagonal bolts 9, and the hexagonal bolts 9 are arranged in the middle of the holes. This ensures that there is a certain amount of sliding space in both directions, so that when the main beam 10 is subjected to small temperature expansion, the double-arch steel pipe 4 can slide a certain distance. Only when the deformation exceeds a certain limit will the double-arch steel pipe 4 be subjected to force.

[0049] The cement mortar leveling layer of the main beam 10 is coated with a thick epoxy resin adhesive, and then covered with asphalt felt, allowing the double-arch steel pipe 4 to slide freely along the longitudinal direction of the bridge. For example, the cement mortar leveling layer is 5mm thick, the epoxy resin adhesive is 1mm thick, and the asphalt felt can be in two layers.

[0050] In summary, this invention, when applied to steel bridges, not only serves as a continuous bridge deck device but also effectively protects the continuous bridge deck structure from damage caused by the rotation of the main girder due to bending moments. This invention is a prefabricated continuous bridge deck module, which can be prefabricated in a factory with pre-controllable quality and safety, significantly reducing construction time, lowering construction difficulty, and ensuring construction quality. Furthermore, in the renovation of old bridges, the new continuous bridge deck device can be directly assembled after the original device is removed, reducing road closure time and minimizing traffic disruption.

[0051] Research shows that the bridge deck continuity device of the present invention has a good effect on preventing concrete cracking at beam joints caused by the main beam bearing the load and reducing the impact of temperature deformation on the continuous structure of the bridge deck.

[0052] Example 2:

[0053] A construction method for a prefabricated modular bridge deck continuous device for a steel simply supported beam bridge can effectively improve the quality and structural safety of the continuous bridge deck structure. It allows for prefabrication in a factory and on-site assembly, effectively shortening the construction period, reducing construction difficulty, and minimizing the impact of environmental conditions on the project. The method includes the following steps:

[0054] Step 1: First, in the factory, the rectangular steel pipe is cold-folded into a double-arch steel pipe 4;

[0055] Step 2: Weld L-shaped rib 1 to the top surface of double-arch steel pipe 4, and weld the top surface connecting steel plate 2 to both ends of the top surface of double-arch steel pipe 4.

[0056] Step 3: After tensioning the prestressed tendons 5, anchor them to both sides of the double-arch steel pipe 4 with anchors 6, and weld the connecting steel bars 7 to both sides of the double-arch steel pipe 4; reserve waist-shaped holes at both ends of the sides of the double-arch steel pipe 4, and also reserve waist-shaped holes on the bottom surface of the double-arch steel pipe 4 to form a double-arch steel pipe prefabrication module 11, and prefabricate the side connecting steel plates 3 in advance;

[0057] Step 4: Place a double-arch steel pipe prefabricated module 11 on the cement mortar leveling layer of the main beam, aligning its reserved waist-shaped hole with the reserved waist-shaped hole on the main beam 10, and connect them with hexagonal bolts 9.

[0058] Step 5: Position the first double-arch steel pipe prefabricated module 11 and set the line. Align the remaining double-arch steel pipe prefabricated modules 11 laterally with the previous module, align the waist-shaped holes of the top connecting steel plate 2 with the top, and connect them with hexagonal bolts 9. Then align the waist-shaped holes reserved on the bottom surface of the double-arch steel pipe prefabricated module 11 with the reserved waist-shaped holes on the main beam 10 and connect them with hexagonal bolts 9.

[0059] Step 6: Overlap and fix the connecting steel bar 7 with the original steel bar, fill the inside of the double arch steel pipe 4 with waterproof foam material, and finally pour the concrete pavement layer.

[0060] For new bridges, the construction of the bridge deck continuous device can be completed by following the above steps. For the renovation of old bridges, it is only necessary to remove the original device, make slight treatment to the connecting steel bars, and then follow the above steps to complete the construction of the new bridge deck continuous device.

[0061] The working principle of the composite bridge deck continuous device for simply supported steel beam bridges provided by this invention is described below:

[0062] like Figure 5 As shown, the double-arch steel pipe prefabricated module 11 provided by this invention is connected to the main beam through waist-shaped holes and hexagonal bolts 9 and a sliding layer. Firstly, due to the unique arched structure of the double-arch steel pipe 4, sufficient space is left at the bottom of the steel pipe, preventing the main beam 10 from squeezing the bridge deck continuous device and causing damage when the beam end tilts upwards due to bending moment. Furthermore, the bridge deck continuous device, due to the sliding layer and connecting steel bars 7, changes the longitudinal force transmission path. Without the sliding layer, the bending moment of the main beam 10 causing tension in the upper part would directly act on the bridge deck continuous device. This leads to the destruction of the device and cracking of the concrete. The slip layer allows the bridge deck continuous device and the main beam 10 to have a certain longitudinal slip when the upper part of the main beam 10 is under tension, without being subjected to force. The main beam 10 first transfers the force to the connecting steel bars, and then the connecting steel bars 7 transfer the force to the bridge deck continuous device, so that the concrete is indirectly subjected to force and avoids cracking of the concrete. The double arch structure of the double arch steel pipe 4 is under tension at the bottom, generating a positive bending moment of upper compression and lower tension, making the structure more reliable. At the same time, the upper part of the steel pipe generates a angular displacement, causing the upper arch to deform, further increasing the positive bending moment effect.

[0063] In fact, this continuous bridge deck device can be placed at the joints of various other bridge beams, which can improve the practicality and durability of the bridge, thereby increasing its lifespan and safety, and playing a positive role in the bridge.

Claims

1. A prefabricated modular bridge deck continuous device for a simply supported steel beam bridge, characterized in that, include: L-shaped rib (1), top connecting steel plate (2), side connecting steel plate (3), double arch steel pipe (4), prestressed tendon (5), anchor (6), connecting steel bar (7), structural steel bar (8) and hexagonal bolt (9); The double-arch steel pipe (4) is a rectangular steel pipe that has been cold-folded and extruded in the middle; the prestressed tendons (5) are tensioned at intervals between the horizontal sides of the double-arch steel pipe (4) and then anchored with anchors (6); four L-shaped ribs (1) are welded to the upper surface of the double-arch steel pipe (4); top connecting steel plates (2) are welded to the front and rear ends of the double-arch steel pipe (4) and connecting steel bars (7) are welded to the sides; the double-arch steel pipe (4) is placed On the cement mortar leveling layer on the upper surface of the main beam (10), the top connecting steel plate (2), the side connecting steel plate (3) and the hexagonal bolts (9) are spliced ​​horizontally; four waist-shaped holes are reserved at intervals at both ends of the bottom surface of the double arch steel pipe (4), the waist-shaped holes coincide with the holes reserved in the main beam (10) and are connected with hexagonal bolts (9); the connecting steel bars (7) and the structural steel bars (8) are overlapped, and the internal space of the double arch steel pipe (4) is filled with waterproof foam material.

2. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The L-shaped ribs (1) are welded to the upper surface of the double-arch steel pipe (4) by fillet welding. The L-shaped ribs (1) are arranged symmetrically and punched on the side of the L-shaped ribs (1).

3. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The top connecting steel plate (2) and the side connecting steel plate (3) both have waist-shaped holes for connection with hexagonal bolts (9).

4. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The upper part of the double-arch steel pipe (4) is an inverted arch, and the lower part is a positive arch.

5. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The arch bending angle of the double-arch steel pipe (4) is determined according to the quadratic parabola.

6. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The yield strength of the double-arch steel pipe (4) is greater than that of the top connecting steel plate (2) and the side connecting steel plate (3).

7. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The prestressed tendons (5) include steel wires, steel strands and steel bars.

8. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The length of the waist-shaped holes reserved at both ends of the double-arch steel pipe (4) and on the main beam is twice the diameter of the hexagonal bolt (9), and the hexagonal bolt (9) is arranged in the middle of the hole.

9. The prefabricated modular bridge deck continuous device for steel simply supported beam bridges according to claim 1, characterized in that, The cement mortar leveling layer of the main beam (10) is coated with thick epoxy resin adhesive and covered with tar paper.

10. A construction method for a prefabricated modular bridge deck continuous device for a steel simply supported beam bridge as described in claim 1, characterized in that, include: Step 1: First, the rectangular steel pipe is cold-folded into a double-arch steel pipe in the factory (4); Step 2: Weld the L-shaped rib (1) to the top surface of the double-arch steel pipe (4), and weld the top surface connecting steel plate (2) to both ends of the top surface of the double-arch steel pipe (4); Step 3: After tensioning the prestressed tendons (5), anchor them to both sides of the double-arch steel pipe (4) with anchors (6), and weld the connecting steel bars (7) to the two sides of the double-arch steel pipe (4); reserve waist-shaped holes at both ends of the sides of the double-arch steel pipe (4), and also reserve waist-shaped holes on the bottom surface of the double-arch steel pipe (4) to form a double-arch steel pipe prefabrication module (11), and prefabricate the side connecting steel plates (3) in advance; Step 4: Place a double-arch steel pipe prefabricated module (11) on the cement mortar leveling layer of the main beam, align the reserved waist-shaped hole with the reserved waist-shaped hole on the main beam (10), and connect them with hexagonal bolts (9). Step 5: Position the first double-arch steel pipe prefabricated module (11) and set the line. Align the remaining double-arch steel pipe prefabricated modules (11) with the previous module in turn, align the waist-shaped holes of the top connecting steel plate (2) with the top, and connect them with hexagonal bolts (9). Then align the waist-shaped holes reserved on the bottom surface of the double-arch steel pipe prefabricated module (11) with the reserved waist-shaped holes on the main beam (10) and connect them with hexagonal bolts (9). Step 6: Overlap and fix the connecting steel bar (7) with the original steel bar, fill the inside of the double arch steel pipe (4) with waterproof foam material, and finally pour the concrete pavement layer.

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