A floating bridge deck continuous composite structure

Abstract

The application discloses a kind of floating bridge deck continuous combination structures, including bridge deck and longitudinal beam, bridge deck is set to longitudinal beam upper end face, it is characterized in that, bridge deck includes the staggered arrangement of multiple main bridge deck and floating bridge deck, longitudinal beam includes the steel beam sequentially arranged along bridge length direction, floating bridge deck is arranged at the butt joint of two adjacent steel beams, and floating bridge deck is connected with the corresponding two steel beams by sliding limiting device.The application reduces even eliminates the cracking of beam bridge deck, the structure stiffness is larger, the bearing capacity is stronger, and the bridge deck driving is more smooth.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a floating bridge deck continuous composite structure. Background Technology

[0002] Continuous composite beam structures are a common type of bridge structure, offering advantages such as lightweight construction, large span, good ride comfort, reasonable cost, and convenient construction. However, because the steel longitudinal beams in a continuous composite beam structure are discontinuous at the pier centerline (the discontinuity length is typically 5-8 cm), while the concrete bridge deck is continuous, the end panels of the steel main beams are the weakest points under stress. Under temperature and vehicle loads, the ends of the steel beams experience horizontal displacement and rotation. Since the concrete bridge deck at the beam ends is continuous, it generates significant longitudinal tensile stress, leading to cracking.

[0003] To suppress cracking at the ends of steel longitudinal beams in continuous composite beam bridge decks, two common methods are used: 1. Using new materials with better tensile strength in the bridge deck structure at the ends of the steel longitudinal beams; 2. Increasing the reinforcement of the bridge deck structure at the ends of the steel longitudinal beams to reduce cracking. Both methods have the following drawbacks: 1) For method 1, it is difficult to find new materials that meet the requirements. Furthermore, the connection between the new materials and ordinary concrete, as well as the high cost and construction technology of the new materials, remain to be solved, resulting in limited practical effectiveness. For method 2, due to the inherently poor tensile strength of concrete, cracking will still occur in the bridge deck even after local reinforcement with steel beams. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a floating bridge deck continuous composite structure that reduces or even eliminates cracking between bridge decks, has greater structural rigidity and load-bearing capacity, and makes driving on the bridge deck smoother, in order to address the above-mentioned defects in the existing technology.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A floating bridge deck continuous composite structure includes a bridge deck and longitudinal beams. The bridge deck is disposed on the upper end face of the longitudinal beams. The bridge deck is characterized in that the bridge deck includes a plurality of main bridge decks and floating bridge decks arranged alternately in sequence, the longitudinal beams include a plurality of steel beams arranged alternately along the length of the bridge, the floating bridge decks are disposed at the joint of two adjacent steel beams, and the floating bridge decks are connected to the corresponding two steel beams by a sliding limiting device.

[0007] According to the above technical solution, the floating bridge deck includes a precast bridge deck and a post-cast bridge deck. The two ends of the precast bridge deck are connected to the main bridge decks on both sides through the post-cast bridge deck.

[0008] According to the above technical solution, the sliding limit device includes a sliding limit plate, a slider and a sliding track. The sliding limit plate is arranged along the length of the steel beam, the sliding track is set on the sliding limit plate along the length of the steel beam, and the slider is set on the sliding track and can move back and forth along the sliding track.

[0009] According to the above technical solution, the slide rail includes an upper slide rail and a lower slide rail respectively arranged above and below the slider. The upper slide rail is located between the bridge panel and the slide rail limiting plate, and the lower slide rail is located on the lower part of the slide rail limiting plate.

[0010] According to the above technical solution, the upper part of the end of the steel beam is provided with an opening groove, and the sliding limiting device is set on the opening groove. The steel beam within the range of the opening groove does not have a top plate.

[0011] According to the above technical solution, there are two slide rail limiting plates. The slide rail limiting plates are L-shaped long steel plates, symmetrically arranged on both sides of the web of the steel beam. The lower slide rail is set on the horizontal leg of the lower part of the L-shaped slide rail limiting plate, and the upper slide rail is set on the upper part of the L-shaped slide rail limiting plate. The upper slide rail, the lower slide rail, and the two side slide rail limiting plates form a wrapping and limiting effect on the slider.

[0012] According to the above technical solution, the width of the horizontal limbs at both ends of the slide rail limiting plate is 1-2 cm wider than the width of the horizontal limbs in the middle region, and the length of the middle region of the slide rail limiting plate is the same as the length of the movable area of ​​the slider.

[0013] According to the above technical solution, the upper end of the vertical limb of the slide rail limiting plate is welded to the top plate of the corresponding steel beam and the upper slide rail, and the horizontal limbs at both ends of the slide rail limiting plate are welded to the web plate of the steel beam.

[0014] According to the above technical solution, multiple shear studs are embedded in the lower part of the bridge deck at intervals along the length of the bridge, and the vertical limbs of the slide rail limiting plate are on the same longitudinal section as the shear studs.

[0015] According to the above technical solution, the precast bridge deck is a prestressed structure using the pre-tensioning method, and the material of the precast bridge deck is composed of ultra-high performance concrete and strong steel bars.

[0016] The present invention has the following beneficial effects:

[0017] This invention combines floating bridge decks within a certain range at the ends of the beams, allowing the bridge deck to freely move horizontally relative to the main beams. This expands the length of the bridge deck that bears longitudinal displacement loads. At the same time, since the bridge decks at the beam ends are prestressed structures, cracking between the bridge decks between beams is reduced or even eliminated. The structure has greater rigidity and stronger load-bearing capacity, resulting in a smoother ride on the bridge. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the continuous composite structure of the floating bridge deck in an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A partial K-view;

[0020] Figure 3 yes Figure 2 A partial M-view;

[0021] Figure 4 yes Figure 3 sectional view of aa;

[0022] Figure 5 yes Figure 3 BB sectional view;

[0023] Figure 6 This is a schematic longitudinal section of the prefabricated bridge deck in an embodiment of the present invention;

[0024] Figure 7 This is an elevation view of the floating bridge deck continuous composite structure at the bridge pier in an embodiment of the present invention;

[0025] Figure 8 This is a perspective view of the steel beam and slide rail in an embodiment of the present invention;

[0026] Figure 9 This is a perspective view of the slide rail limiting plate in an embodiment of the present invention;

[0027] Figure 10 This is a construction flowchart of the floating bridge deck continuous composite structure in an embodiment of the present invention;

[0028] In the diagram, 1-existing bridge deck, 2-floating bridge deck, 21-precast bridge deck, 211-shear studs, 213-exposed reinforcing bars of precast bridge deck, 22-post-cast bridge deck, 23-sliding limiting device, 231-slide rail limiting plate, 232-slider, 233-lower slide rail, 234-upper slide rail, 2331-horizontal limb end area, 2332-horizontal limb middle area, 2333-vertical limb, 3-steel beam, 31-steel beam web, 32-steel beam bottom plate, 33-steel beam top plate. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Reference Figures 1-9As shown, a floating bridge deck continuous composite structure provided in one embodiment of the present invention includes a bridge deck and longitudinal beams. The bridge deck is disposed on the upper end face of the longitudinal beams. The bridge deck includes a plurality of main bridge decks and floating bridge decks 2 arranged alternately in sequence. The longitudinal beams include a plurality of steel beams 3 arranged sequentially along the length of the bridge. The floating bridge decks 2 are disposed at the joint of two adjacent steel beams 3. A pier is provided at the joint of two adjacent steel beams 3. The ends of the steel beams 3 are placed on the piers. A sliding limiting device 23 is provided between the floating bridge decks 2 and the steel beams 3. The floating bridge decks 2 are connected to the corresponding two steel beams 3 through the sliding limiting device 23.

[0031] Furthermore, the floating bridge deck 2 includes a precast bridge deck 21 and a post-cast bridge deck 22. The two ends of the precast bridge deck 21 are connected to the adjacent main bridge decks on both sides through the post-cast bridge deck 22.

[0032] Furthermore, the sliding limit device 23 includes a slide limit plate 231, a slider 232, and a slide. The sliding limit plate is arranged along the length of the steel beam, the slide is set on the sliding limit plate along the length of the steel beam, and the slider 232 is set on the slide and can move back and forth along the slide.

[0033] Furthermore, the slide rail includes an upper slide rail 234 and a lower slide rail 233 respectively arranged above and below the slider 232. The upper slide rail 234 is disposed between the bridge panel and the slide rail limiting plate, and the lower slide rail 233 is disposed on the lower part of the slide rail limiting plate.

[0034] Furthermore, the upper part of the end of the steel beam is provided with an opening groove, and the sliding limiting device 23 is set on the opening groove. The steel beam within the range of the opening groove does not have a steel beam top plate 33.

[0035] Furthermore, there are two slide rail limiting plates, which are L-shaped long steel plates symmetrically arranged on both sides of the web plate 31 of the steel beam. The lower slide rail 233 is set on the horizontal leg of the lower part of the L-shaped slide rail limiting plate, and the upper slide rail 234 is set on the upper part of the L-shaped slide rail limiting plate. The upper slide rail 234, the lower slide rail 233, and the two side slide rail limiting plates form a wrapping and limiting effect on the slider 232.

[0036] Furthermore, the horizontal limbs at both ends of the slide rail limiting plate are 1-2 cm wider than the horizontal limbs in the middle region, and the length of the middle region of the slide rail limiting plate is the same as the length of the movable area of ​​the slider 232 along the length of the steel beam.

[0037] That is, the length of the upper slide rail 234 and the length of the lower slide rail 233 are the same as the length of the middle area of ​​the slide rail limiting plate. The middle area of ​​the slide rail limiting plate is located below the precast bridge panel 21. The length of the middle area of ​​the slide rail limiting plate is the same as the length of the precast bridge panel 21. The two ends of the slide rail limiting plate are located below the post-cast bridge panel 22.

[0038] Furthermore, the upper end of the vertical limb of the slide rail limiting plate is welded to the corresponding steel beam top plate 33 and the upper slide rail 234, and the horizontal limbs at both ends of the slide rail limiting plate are welded to the steel beam web plate 31.

[0039] Furthermore, multiple shear studs 211 are embedded at intervals along the length of the bridge deck at the lower part, and the vertical limbs 2333 of the slide rail limiting plate 231 are on the same longitudinal section as the shear studs 211.

[0040] Furthermore, the precast bridge deck 21 is a prestressed structure made of pre-tensioned concrete, and the material is composed of ultra-high performance concrete (UHPC) and strong steel bars (yield strength ≥ 500 MPa).

[0041] The bridge deck is a double-layer, two-way reinforced concrete slab structure, with steel mesh arranged along the top and bottom surfaces of the concrete slab, and shear studs placed at the lower layer of steel mesh.

[0042] The main bridge deck is the existing bridge deck 1.

[0043] The construction process of the aforementioned floating bridge deck continuous composite structure, such as Figure 10 As shown, the process includes the following steps: 1) chiseling away the bridge deck in the cracked area; 2) cutting the top plate of the corresponding steel beam end to create an opening slot; 3) installing a slide rail at the opening slot; 4) installing the precast bridge deck; 5) installing the slide rail limiting plate; and 6) pouring the post-cast strip bridge deck.

[0044] A floating bridge deck continuous composite structure includes: an existing bridge deck 1, a floating bridge deck 2, and steel beams 3, wherein the floating bridge deck 2 includes a precast bridge deck 21, a post-cast bridge deck 22, and a sliding limiting device 23; its construction process mainly includes:

[0045] 1: Remove the bridge deck in the cracked area (concrete removal length L1+L2=1.9~2.5m);

[0046] 2: Cut the top plate of the steel beam at the beam end at 33mm.

[0047] According to the above scheme, when cutting off the top plate of the steel beam 3 at the beam end, the cutting length L2 of the top plate is 1.5 to 2m;

[0048] According to the above plan, when cutting off the top plate, the web plate at the bottom of the top plate should also be cut off (the cutting height is consistent with the height of the slider 232 and the slide rail combination).

[0049] 3: Installation of the lower slide rail 233 and slider 232;

[0050] According to the above scheme, two lower slide rails 233 are welded to the web plates 31 at the beam ends on both sides of the support. The slide rail is a long strip steel plate with a thickness of 3-4cm and a width of 15-25cm, and its length is consistent with the length L2 of the cut-off top plate.

[0051] According to the above scheme, the slider 232 is arranged on the slide rail, with the same width as the slide rail and a thickness of 2-3cm, and serves as an elastic support for the upper bridge panel structure.

[0052] Furthermore, the elastic support is a polytetrafluoroethylene sheet;

[0053] 4: Installation of prefabricated bridge deck 21;

[0054] According to the above scheme, the precast bridge deck is made of ultra-high performance concrete (UHPC);

[0055] According to the above scheme, the precast bridge deck 21 is a prestressed structure using the pre-tensioning method, which applies longitudinal prestress to the bridge deck structure by tensioning the longitudinal steel bars during factory prefabrication.

[0056] Furthermore, the aforementioned reinforcing bars are reinforced using a double-layer steel mesh reinforcement method at both the top and bottom surfaces;

[0057] Furthermore, the aforementioned reinforcing steel is a rigid steel bar with a tensile strength greater than 500 MPa;

[0058] Furthermore, the longitudinal steel bars 213 exposed on each side of the steel bar are 300-400mm in length. On the one hand, the exposed longitudinal steel bars are used for tensioning and anchoring during factory prefabrication, and on the other hand, they are used for lap anchoring between the post-cast strip and the original steel bars.

[0059] The precast bridge deck has a steel plate of the same specifications as the original steel beam top plate 33 installed at its lower part to serve as the upper slide rail 234.

[0060] Furthermore, the upper slide rail 234 is anchored to the precast bridge deck by shear studs 211;

[0061] 5: Installation of slide rail limit plate;

[0062] According to the above scheme, the slide rail limiting plate 231 is an "L" shaped long steel plate, with the middle region 2332 having a shorter horizontal leg width and the two end regions 2331 having a wider horizontal leg width, wherein the end region is 1-2 cm wider than the middle region's horizontal leg width.

[0063] Furthermore, the slide rail limiting plate 231 has a central region 2332 with a length of 2.6 to 3.6 m (2L2-0.4), and the end regions 2332 on both sides are 700 to 800 mm.

[0064] Furthermore, the vertical limb 2333 of the slide rail limiting plate 231 is welded to the top plate 33 of the steel beam and the upper slide rail steel plate 234, and the lower part is welded to the web plate 31 of the steel beam at the end regions 2331 of the horizontal limbs at both ends.

[0065] Furthermore, the vertical limb 2333 of the slide rail limiting plate 231 is on the same longitudinal section as the shear stud 211;

[0066] 6: Post-cast strip bridge deck pouring;

[0067] According to the above scheme, the post-cast strip concrete is made of ultra-high performance concrete (UHPC);

[0068] Furthermore, the length L1 of the bridge deck of the post-cast strip is 400-500mm;

[0069] In summary, the invention offers the following advantages: 1. No cracking in the bridge deck between beams: By designing the bridge deck within a certain range at the ends of the composite beams as a longitudinally floating structure, the length of the bridge deck bearing longitudinal displacement is expanded from the traditional inter-beam bridge deck (length: 5-8cm) to the floating bridge deck (length: 2L² = 3000-4000cm). Furthermore, since the floating bridge deck is a longitudinally prestressed structure, and the bridge deck material UHPC has excellent tensile strength, cracking in the bridge deck can be eliminated. 2. Strong waterproofing and good structural durability: With this invention, the bridge deck does not crack, resulting in good structural waterproofing and effectively preventing corrosion of the reinforcing bars and steel beams, thus improving structural durability. 3. High structural stiffness and strong load-bearing capacity: With this invention, since the bridge deck is virtually crack-free, the overall integrity of the bridge deck structure is good, the bridge deck stiffness is high, and the load-bearing capacity is strong. 4. Smoother driving experience: With the new structure, the inter-beam bridge deck no longer cracks, the bridge deck stiffness is more uniform, and the driving experience on the bridge deck is smoother. 5. Simple construction and wide applicability of the structure: Since the floating bridge deck is a prefabricated component, it only needs to be hoisted on site and then welded and positioned. The construction is relatively simple. Moreover, this structure is not only suitable for the renovation of existing composite beam structures, but also for the construction of new composite beam bridges, and has good economic and practical value.

[0070] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A floating bridge deck continuous composite structure, comprising a bridge deck panel and longitudinal beams, wherein the bridge deck panel is disposed on the upper end face of the longitudinal beams, characterized in that, The bridge deck includes multiple main bridge decks and floating bridge decks arranged in a staggered manner. The longitudinal beams include multiple steel beams arranged in a staggered manner along the length of the bridge. The floating bridge decks are arranged at the joints of two adjacent steel beams and are connected to the corresponding two steel beams by a sliding limiting device. The floating bridge deck includes precast bridge decks and post-cast bridge decks. The two ends of the precast bridge decks are connected to the main bridge decks on both sides through post-cast bridge decks. The sliding limit device includes a slide limit plate (231), a slider (232) and a slide. The sliding limit plate is arranged along the length of the steel beam, the slide is set on the sliding limit plate along the length of the steel beam, and the slider is set on the slide and can move back and forth along the slide. The slide rail includes an upper slide rail and a lower slide rail respectively arranged above and below the slider. The upper slide rail is located between the bridge panel and the slide rail limiting plate, and the lower slide rail is located on the lower part of the slide rail limiting plate. The upper part of the end of the steel beam is provided with an opening groove, and a sliding limiting device is set on the opening groove. There is no steel beam top plate within the opening groove range. There are two slide rail limiting plates, which are L-shaped long steel plates symmetrically arranged on both sides of the web of the steel beam. The lower slide rail is set on the horizontal leg of the lower part of the L-shaped slide rail limiting plate, and the upper slide rail is set on the upper part of the L-shaped slide rail limiting plate. The upper slide rail, lower slide rail, and side slide rail limiting plates form a wrapping and limiting effect on the slider. The width of the horizontal limbs at both ends of the slide rail limiting plate is 1-2 cm wider than the width of the horizontal limbs in the middle area. The length of the middle area of ​​the slide rail limiting plate is the same as the length of the movable area of ​​the slider. Multiple shear studs are embedded in the lower part of the bridge deck at intervals along the length of the bridge. The vertical limb (2333) of the slide rail limiting plate (231) and the shear stud (211) are on the same longitudinal section. The precast bridge deck (21) is a prestressed structure using the pre-tensioning method. The material of the precast bridge deck (21) is composed of ultra-high performance concrete and strong steel bars.

2. The floating bridge deck continuous composite structure according to claim 1, characterized in that, The upper end of the vertical limb of the slide rail limiting plate is welded to the top plate of the corresponding steel beam and the upper slide rail, and the horizontal limbs at both ends of the slide rail limiting plate are welded to the web of the steel beam.

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