Bridge deck pavement system suitable for pedestrian steel overpass and pedestrian steel overpass

Abstract

The utility model relates to the technical field of pedestrian steel overbridges, and provides a bridge deck pavement system suitable for a pedestrian steel overbridge and the pedestrian steel overbridge, the pavement system comprises: a shear key structure with a height less than or equal to 2cm, used for being connected with the top surface of a steel bridge deck; the thickness of the UHPC pavement layer is smaller than 4 cm, the UHPC pavement layer is laid on the top of the steel bridge deck slab, the thickness of the UHPC pavement layer is uniform, and the UHPC pavement layer covers the top face of the shear key structure. The UHPC pavement layer disclosed by the utility model has the characteristics of high strength, high compactness and the like, and can improve the pavement durability of the overbridge and reduce or avoid the diseases such as pavement falling, swelling, cracking and water seepage, so that the pavement system structure is firmer, the stress requirement of the steel overbridge under the crowd load can be met, and the pavement quality is improved. The ultra-thin UHPC pavement matched with the actual stress requirement of the overbridge can also have good economical efficiency, meanwhile, the UHPC combined pavement system of the overbridge improves the rigidity of the bridge deck of the steel overbridge, and the problem of local tremor of the steel overbridge is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pedestrian overpasses, in particular to a bridge deck paving system suitable for steel pedestrian overpasses and the steel pedestrian overpass. Background Art

[0002] Pedestrian overpasses are important crossing facilities in urban transportation systems. Generally speaking, the paving system of overpasses should meet the following requirements: flat, non-slip, drainable, noise-free, and easy to maintain.

[0003] In the prior art, the paving systems of pedestrian steel overpass decks are usually divided into three types: the first type is a flexible paving system formed by rubber boards, PU boards, plastic boards, etc., which has good visual effects and comfort, but poor weather resistance and is prone to aging and damage. Under exposure to the sun and rain erosion, large-scale shrinkage, bulging, curling, warping and other problems often occur.

[0004] The second type is thin-layer colored surface paving represented by epoxy, acrylic, polyurea, etc., which has good anti-slip performance, thin thickness, light weight, and bright colors, but has high construction requirements and is difficult to control construction quality (during construction, the glue is mixed and stirred manually, then scraped and coated on the steel structure surface, and finally colored anti-slip particles are sprinkled on the binder). The anti-slip particles are easy to fall off during operation, resulting in a decrease in anti-slip performance.

[0005] The third type is to pave a thin layer of anti-slip mortar composed of polymer resin, silicate cement, anti-slip particles and pigments. The advantage is that the anti-slip particles are not directly exposed and are not easy to fall off, but the bonding performance between the mortar and the steel plate is poor, and the paving is prone to early falling off and pits, posing a safety hazard.

[0006] In summary, the pedestrian bridge paving systems in the prior art all have various problems, are easily damaged, and have a short service life. Utility Model Content

[0007] The utility model provides a bridge deck paving system suitable for a pedestrian steel overpass and a pedestrian steel overpass, so as to solve the defect that the bridge deck paving of the pedestrian steel overpass in the prior art is easy to be damaged, and realize a longer service life of the paving system of the pedestrian steel overpass, which is more durable than the existing pedestrian steel overpass paving system.

[0008] The utility model provides a bridge deck paving system suitable for a pedestrian steel overpass, comprising:

[0009] Shear key structures with a height of less than or equal to 2 cm are used to connect with the top surface of the steel bridge;

[0010] A UHPC pavement layer with a thickness of less than 4 cm is laid on the top of the steel bridge. The thickness of the UHPC pavement layer is uniform, and the UHPC pavement layer covers the top surface of the shear key structure.

[0011] According to the utility model, a bridge deck paving system suitable for a pedestrian steel overpass is provided, which also includes:

[0012] The UHPC floor covering is integrally connected with the UHPC paving layer.

[0013] According to the utility model, a bridge deck paving system suitable for a pedestrian steel overpass is provided, which also includes:

[0014] The top surface of the expansion joint is covered with a steel plate, one end of which is connected to the top of the steel bridge deck, and the other end is not connected above the stairway steel plate to facilitate free expansion and contraction under temperature load changes. The top surface of the expansion joint is covered with a steel plate flush with the top surface of the UHPC pavement layer.

[0015] According to a bridge deck paving system suitable for a pedestrian steel overpass provided by the utility model, the shear key structure includes: a steel mesh, the steel mesh includes a bottom steel bar and a top steel bar, the top steel bar and the bottom steel bar are cross-arranged, and the bottom steel bar is welded to the steel bridge deck.

[0016] According to a bridge deck paving system suitable for a pedestrian steel overpass provided by the utility model, the shear key structure includes: a plurality of headless welding nails, and the plurality of headless welding nails are evenly distributed.

[0017] According to a bridge deck paving system suitable for a pedestrian steel overpass provided by the utility model, the shear key structure includes: a plurality of shear nails, and the plurality of shear nails are evenly distributed.

[0018] According to a bridge deck paving system suitable for a pedestrian steel overpass provided by the utility model, an anti-skid structure is arranged on the top of the UHPC paving layer.

[0019] According to a bridge deck paving system suitable for a pedestrian steel overpass provided by the utility model, the UHPC paving layer is provided with contraction joints at intervals along the extension direction of the bridge, and the contraction joints are filled with caulking paste.

[0020] The utility model also provides a pedestrian steel overpass, comprising:

[0021] Pier,

[0022] A steel main beam, arranged on the top of the pier;

[0023] A steel bridge deck is arranged on the top of the steel main beam;

[0024] A bridge deck paving system suitable for a steel pedestrian overpass as described above.

[0025] The bridge deck paving system suitable for a pedestrian steel overpass provided by the utility model is connected to the steel bridge deck through a small-sized shear key structure. A UHPC paving layer with a thickness of less than 4 cm is laid on the top of the steel bridge deck. The thickness of the UHPC paving layer is uniform, and the UHPC paving layer covers the top surface of the shear key structure. The UHPC paving layer has the characteristics of high strength and high density. A combined paving system of small-sized shear keys and ultra-thin UHPC paving layers is adopted. While taking into account the economy and stress of the steel overpass paving, the durability of the overpass paving is improved, and the diseases such as paving shedding, bulging, cracking, and water seepage are reduced or avoided, so as to make the paving system structure more solid. At the same time, this paving system also improves the stiffness of the steel bridge deck, and effectively improves the local vibration problem of the steel overpass.

[0026] In addition, the shear key structure uses a 1cm diameter steel mesh or a 2cm high headless welded nail arranged in a plum blossom shape, welded to the steel bridge deck. It can combine numerical simulation and indoor mechanical tests to reduce the thickness of the UHPC pavement layer. While meeting the stress of the steel overpass under the crowd load, the pavement thickness is reduced to less than 4cm, thereby meeting the stress safety and durability requirements of the pedestrian overpass and reducing the cost of the pavement. At the same time, compared with the existing steel overpass pavement, this pavement system can also significantly improve the problem of local vibration of the steel overpass deck.

[0027] The steel pedestrian overpass provided by the utility model has the various advantages as mentioned above because it includes the bridge deck paving system of the steel pedestrian overpass as mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is one of the plan views of a bridge deck paving system test piece applicable to a pedestrian steel overpass in an embodiment provided by the utility model;

[0030] Figure 2 It is one of the side views of a bridge deck paving system test piece applicable to a pedestrian steel overpass according to an embodiment of the utility model;

[0031] Figure 3 It is a schematic diagram of the connection structure between the bridge deck and the floor covering of an embodiment provided by the utility model and applicable to a pedestrian steel overpass;

[0032] Figure 4This is a second plan view of a bridge deck paving system test piece applicable to a pedestrian steel overpass according to an embodiment of the utility model;

[0033] Figure 5 This is a second side view of a test piece of a bridge deck paving system applicable to a pedestrian steel overpass according to an embodiment of the utility model;

[0034] Figure 6 This is a structural schematic diagram of a steel pedestrian bridge according to an embodiment of the utility model;

[0035] Reference numerals:

[0036] 1. Steel bridge deck; 2. UHPC pavement layer; 3. UHPC floor covering; 4. Steel plate covering the top surface of the expansion joint; 5. Steel mesh; 51. Bottom steel bar; 52. Top steel bar; 6. Headless welded nails; 7. Pier column; 8. Steel main beam; 9. Railing. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] Combine the following Figures 1 to 6 The utility model is described in its first aspect as a bridge deck paving system suitable for a steel pedestrian overpass.

[0040] like Figure 1 and Figure 2As shown, the first embodiment of the utility model is to provide a bridge deck paving system suitable for a pedestrian steel overpass, including a shear key structure and a UHPC paving layer 2, wherein the shear key structure is used to connect with the top surface of the steel bridge deck 1, and the shear key structure adopts a structure with a height less than or equal to 2 cm; its function is mainly to ensure the connection between the UHPC concrete and the steel plate, so that the UHPC concrete and the steel bridge deck form a combined bridge deck system to bear force together. The UHPC paving layer 2 is laid on the top of the steel bridge deck 1, the thickness of the UHPC paving layer is less than 4 cm and is evenly distributed, and the UHPC paving layer 2 covers the top surface of the shear key structure. UHPC is an ultra-high performance concrete with high strength, high durability and excellent working performance. Here, UHPC is used as a paving material. It is used as a paving layer and laid on the top of the steel bridge deck 1. It is effectively connected with the steel plate through the shear key structure, which improves the durability of the overpass pavement and reduces or avoids pavement shedding, bulging, cracking, water seepage and other diseases. At the same time, this paving system improves the stiffness of the steel overpass deck and effectively improves the problem of local vibration of the steel overpass. The UHPC pavement layer not only provides protection for the bridge deck material, but also ensures the flatness of the bridge deck through its uniform thickness, improving the comfort and safety of pedestrians.

[0041] In addition, when selecting UHPC materials, shrinkage can be reduced by mixing expansion agents with curing agents. Although the expansion agent will increase the porosity of UHPC and reduce its strength, ultra-high strength is not currently required for pedestrian overpass paving. The strength can be appropriately reduced to meet the stress requirements of the overpass. At the same time, in order to prevent exposed steel fibers from injuring people, polypropylene fibers (codenamed PP) are used instead of steel fibers, which is more suitable for urban pedestrian steel overpasses.

[0042] like Figure 3 As shown, in a feasible embodiment of the utility model, it also includes a UHPC ground blanket 3, which is integrally connected to the UHPC pavement layer 2. The UHPC ground blanket 3 is closely connected to the UHPC pavement layer 2 to form a continuous whole. Such a design helps to utilize the dense and durable characteristics of UHPC concrete to prevent the ground blanket from rusting. At the same time, it can protect the base of the railing of the steel overpass, greatly reduce the probability of rusting at the base of the railing of the steel overpass, and prevent the occurrence of safety accidents caused by railing corrosion. This connection method between the UHPC ground blanket 3 and the UHPC pavement layer 2 means that they work together as a whole and can better withstand external loads and environmental influences. This connection method also simplifies the construction process and improves the reliability of the structure.

[0043] The UHPC floor covering 3 and the UHPC paving layer 2 form an integrated UHPC paving floor covering, which completely prevents the generation of water seepage channels and can greatly reduce the probability of corrosion of steel components. During the specific construction, after the railing 9 is directly welded to the bridge deck, a formwork is set up to cast the integrated UHPC paving floor covering. Due to the density of the UHPC paving layer 2 and the UHPC floor covering 3, the welding points of the railing 9 are protected and encapsulated.

[0044] In a feasible embodiment of the present invention, it also includes a steel plate 4 covering the top surface of the expansion joint, one end of which is connected to the top of the steel bridge deck 1, and the other end is not connected above the stairway steel plate to facilitate free expansion and contraction under changes in temperature load. The steel plate 4 covering the top surface of the expansion joint is flush with the top surface of the UHPC pavement layer 2.

[0045] Existing steel overpass expansion joints have problems such as damaged waterstops, aging, and deformation of expansion joints, which cause the drainage of the overpass deck to seep along the beam ends of the staircase beams to the top surface of the main beam corbels, causing a humid environment at the corbels and leading to severe rust of the corbel steel plates. In this embodiment, the overpass is made seamless, and a steel plate 4 covering the top surface of the expansion joint is arranged above the main beam and the stair ramp. It is fixed on one side of the main bridge and slides on one side of the stair ramp. At the same time, it is necessary to ensure that the pavement end is aligned with the vertical surface of the staircase treads at high and low temperatures to ensure that a large amount of water will not seep into the expansion joints when the temperature changes, thereby slowing down the rust of the corbel steel plates to the greatest extent.

[0046] See again Figure 1 and Figure 2 As shown, in a feasible embodiment of the utility model, the shear key structure includes: a steel mesh 5, the steel mesh includes a bottom steel bar 51 and a top steel bar 52, the bottom steel bar 51 and the top steel bar 52 are cross-arranged, and the cross-arranged bottom steel bar 51 and the top steel bar 52 can provide more uniform support and reduce bending or deformation caused by load. The cross-arrangement of the bottom steel bar 51 and the top steel bar 52 can provide more comprehensive support and enhance the overall stability of the structure. At the same time, the cross-arranged steel mesh can better resist the temperature stress generated by the hydration heat of the early pouring of UHPC concrete. This cross configuration can also increase the ductility and bearing capacity of the structure, so that it can better cope with various external loads and stresses. The bottom steel bar 51 is welded to the steel bridge deck 1, and this connection method ensures a firm bond between the steel mesh and the steel bridge deck. Welding is a reliable connection method that can provide greater connection strength and reduce possible stress concentration areas. The bottom steel bar 51 and the top steel bar 52 can be arranged vertically.

[0047] Generally speaking, the bottom steel bar 51 and the top steel bar 52, in this embodiment, the UHPC pavement layer can be 3 cm, polypropylene fibers can be added, and the size of the steel mesh 5 can be set according to actual needs. For example, the mesh size of the steel mesh 5 is 150 mm*150 mm and the diameter is 8 mm.

[0048] like Figure 4 and Figure 5 As shown, in a feasible embodiment of the utility model, the shear key structure includes: a plurality of headless weld nails 6, which are a common connection method for firmly connecting different materials or components together. Here, the headless weld nails are used to strengthen the connection between the shear key structure and the steel bridge deck. The plurality of headless weld nails 6 are evenly distributed. By ensuring that the headless weld nails 6 are evenly distributed on the shear key structure, the uniformity and stability of the connection can be ensured. This distribution method helps to reduce stress concentration points and improve the overall bearing capacity of the structure.

[0049] In a feasible embodiment of the utility model, the shear key structure includes: a plurality of shear nails, which are also a component for strengthening the connection. Their main function is to transmit and disperse the shear force, effectively connect the UHPC concrete with the steel structure, and enhance the stability of the structure. The plurality of shear nails are evenly distributed, and by ensuring that the shear nails are evenly distributed on the shear key structure, the uniformity and stability of the connection can be ensured. This distribution method helps to reduce stress concentration points and improve the overall bearing capacity of the structure.

[0050] In a feasible embodiment of the utility model, the steel plate 4 covering the top surface of the expansion joint is a telescopic steel plate to ensure that the structure can freely expand and contract under temperature. The steel plate has high strength and rigidity, can withstand external impact and pressure, and ensure the stability of the steel plate 4 covering the top surface of the expansion joint. Using the steel plate as the material for covering the top surface of the expansion joint can prevent water from entering the expansion joint and slow down the corrosion of the steel main beam under the expansion joint. In addition, the steel plate is easy to process and install, and can meet the structural requirements for connection stability.

[0051] In a feasible embodiment of the present invention, an anti-skid structural measure is provided on the top surface of the UHPC pavement layer 2, and the surface roughness can be increased by anti-skid grooves, engravings, etc. to meet the anti-skid requirements.

[0052] In summary, the bridge deck paving system suitable for a pedestrian steel overpass provided by the embodiment of the first aspect of the utility model is connected to the steel bridge deck 1 through a small-sized shear key structure, and the ultra-thin UHPC paving layer 2 is laid on the top of the steel bridge deck 1. The thickness of the UHPC paving layer 2 is uniform, and the UHPC paving layer 2 covers the top surface of the shear key structure. The UHPC paving layer 2 has the characteristics of high strength and high density. Through the small-sized shear key structure, the ultra-thin UHPC paving layer 2 is reliably connected to the overpass steel bridge deck 1 to form a combined paving system, which can improve the durability of the overpass pavement, reduce or avoid pavement shedding, bulging, cracking, water seepage and other defects, so as to make the paving system structure more solid. At the same time, this combined paving system significantly improves the stiffness of the steel bridge deck 1 compared with the traditional single-layer steel overpass pavement, and can effectively improve the problem of local vibration of the steel overpass.

[0053] like Figure 6 As shown, the second embodiment of the utility model provides a pedestrian steel bridge, including piers 7, steel main beams 8, steel bridge decks 1 and the above-mentioned steel bridge deck paving system suitable for pedestrian bridges. The piers 7 are the foundation of the entire structure and are responsible for bearing the weight of the entire structure. The piers 7 are usually buried deep underground to ensure the stability of the structure. The steel main beams 8 are arranged on the top of the piers 7. The main function of the steel main beams 8 is to transfer and disperse the load. The steel main beams 8 transfer the weight from the steel plates and other loads to the bearing columns to ensure the stability of the entire structure. The steel bridge deck 1 is arranged on the top of the steel main beams 8. The steel bridge deck 1 is a component that directly bears the pedestrian load and is located on the top of the steel main beams 8. Its durability and safety are improved through a reasonable paving system. As described above, the steel bridge deck paving system suitable for pedestrian bridges includes the shear key structure, UHPC paving layer, UHPC ground burden and expansion joint covering steel plate provided in any embodiment of the first aspect of the utility model, providing a stable, safe and durable pedestrian steel bridge deck paving system.

[0054] The pedestrian steel overpass provided in the implementation case of the second aspect of the utility model, compared with the prior art, adopts UHPC pavement layer 2, which can improve the durability of the overpass pavement, reduce or avoid pavement shedding, bulging, cracking, water seepage and other diseases, so as to make the pavement system structure more solid, and at the same time improve the stiffness of the steel bridge deck, effectively improving the problem of local vibration of the steel overpass. Moreover, a relatively sparse and smaller shear key arrangement can be adopted, and the pavement thickness can be reduced to adapt to the load of the pedestrian steel overpass, and the pavement thickness can be reduced to less than 4 cm. After the bonding strength, shear strength and fatigue performance tests of the specimens are carried out, it is guaranteed to meet the use requirements of the pedestrian overpass.

[0055] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A bridge deck paving system suitable for a pedestrian steel overpass, characterized in that: include: A shear key structure with a height less than or equal to 2 cm, used for connecting with the top surface of the steel bridge deck (1); A UHPC pavement layer (2) with a thickness of less than 4 cm is laid on the top of the steel bridge deck (1); the thickness of the UHPC pavement layer is uniform, and the UHPC pavement layer (2) covers the top surface of the shear key structure.

2. The bridge deck paving system suitable for a pedestrian steel overpass according to claim 1, characterized in that: Also includes: The UHPC floor covering (3) is integrally connected to the UHPC paving layer (2).

3. The bridge deck paving system suitable for a pedestrian steel overpass according to claim 1, characterized in that: Also includes: The top surface of the expansion joint is covered with a steel plate (4), one end of which is connected to the top of the steel bridge deck (1), and the other end is not connected above the stairway steel plate to facilitate free expansion and contraction under temperature load changes. The top surface of the expansion joint is covered with a steel plate that is flush with the top surface of the UHPC pavement layer (2).

4. The bridge deck paving system suitable for a pedestrian steel overpass according to claim 1, characterized in that: The shear key structure comprises: a steel mesh (5), the steel mesh comprising a bottom layer of steel bars (51) and a top layer of steel bars (52), the bottom layer of steel bars (51) and the top layer of steel bars (52) being arranged crosswise, and the bottom layer of steel bars (51) being welded to the steel bridge deck (1).

5. The bridge deck paving system suitable for a pedestrian steel overpass according to claim 1, characterized in that: The shear key structure comprises: a plurality of headless welding nails (6), and the plurality of headless welding nails (6) are evenly distributed.

6. The bridge deck paving system suitable for a pedestrian steel overpass according to claim 1, characterized in that: The shear key structure comprises: a plurality of shear nails, and the plurality of shear nails are evenly distributed.

7. The bridge deck paving system suitable for a pedestrian steel overpass according to claim 1, characterized in that: An anti-slip structure is provided on the top of the UHPC pavement layer (2).

8. The bridge deck paving system suitable for a pedestrian steel overpass according to claim 1, characterized in that: The UHPC pavement layer (2) is provided with contraction joints at intervals along the extension direction of the bridge, and the contraction joints are filled with caulking paste.

9. A steel pedestrian bridge, characterized in that: include: Pier (7), A steel main beam (8) is arranged on the top of the pier (7); A steel bridge deck (1) is arranged on the top of the steel main beam (8); A bridge deck paving system suitable for a pedestrian steel overpass as described in any one of claims 1 to 8.

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