Anti-collision assembled UHPC side girder structure and construction method thereof

Abstract

The application discloses an anti-collision assembled UHPC side main beam structure, which comprises two prefabricated UHPC side main beams and a prefabricated UHPC bridge deck, the two prefabricated UHPC side main beams are symmetrically distributed on the two sides of the prefabricated UHPC bridge deck, a plurality of prefabricated UHPC cross beams are arranged in the prefabricated UHPC bridge deck in a spaced and parallel mode, the bottom of the prefabricated UHPC side main beam, the end of the prefabricated UHPC cross beam and the side of the prefabricated UHPC bridge deck are connected into an integrated whole through a post-pouring belt, and a cast-in-situ bridge deck formed by pouring ordinary concrete is arranged on the prefabricated UHPC bridge deck. The application further discloses a construction method of the anti-collision assembled UHPC side main beam structure. The application has the advantages that the side main beam is prefabricated by using UHPC, has the advantages of small size, small self-weight, high strength, convenient construction and the like, has good operability, can improve the durability of the side main beam and reduce the later operation cost, and the polyamide plate arranged on the inner side can absorb the energy generated by external force impact, so that the problem that the side main beam of a highway is impacted by external force in the operation process and causes the collapse of the bridge can be solved.

Description

Technical Field

[0001] This invention relates to the field of highway bridge technology, specifically to a prefabricated UHPC side main beam structure with crashworthiness protection and its construction method. Background Technology

[0002] With the continuous development of the social economy, the demand for road transportation in my country is increasing, leading to the vigorous development of highway bridges. In recent years, the construction of highway bridges has generally faced problems such as limited clearance under the bridge and excessively high costs. As a result, many bridge structures have begun to shift from the traditional upper-bearing type to the lower-bearing type (i.e., side-girder bridges), which is commonly seen in railway bridges. Compared with upper-bearing beams of the same span, the bridge deck elevation of the side-girder type is significantly reduced, which can lower the embankment height and greatly reduce the overall cost of the route.

[0003] Currently, prefabrication technology is widely used due to its ability to accelerate construction, conserve resources and energy, adapt to the development of energy conservation and environmental protection, and improve construction quality and safety. Prefabricated concrete bridges have gradually become a research hotspot. Furthermore, using UHPC (ultra-high performance concrete) prefabricated components—small in size, low in weight, and high in strength—would further improve the transportation and hoisting of prefabricated components, which is highly significant for prefabricated construction methods. Simultaneously, using composite bridge decks (i.e., a lower prefabricated UHPC bridge deck and an upper ordinary concrete bridge deck) can not only reduce the hoisting weight of prefabricated components but also allow for the use of cast-in-place ordinary concrete in the pressure-bearing areas of the bridge deck, reducing the amount of UHPC used and further lowering the bridge cost. This is valuable for the development of highway bridge engineering.

[0004] Currently, side beams are mostly used in railway bridges, where the established train routes do not place high demands on their impact resistance. However, when side beams are used in highway bridges, the impact of vehicle loads can easily damage them, leading to serious consequences such as bridge collapse. Therefore, employing appropriate anti-collision measures to dissipate the energy of external impacts and prevent the side beams from breaking is crucial for highway side beams. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a high-strength, lightweight, and impact-resistant prefabricated UHPC side beam structure and its construction method.

[0006] The technical solution adopted in this invention is as follows: a collision-resistant prefabricated UHPC side main beam structure, comprising two prefabricated UHPC side main beams and a prefabricated UHPC bridge deck. The two prefabricated UHPC side main beams are symmetrically distributed on both sides of the prefabricated UHPC bridge deck. The bottom of the prefabricated UHPC bridge deck is provided with several spaced and parallel prefabricated UHPC crossbeams. The bottom of the prefabricated UHPC side main beams, the ends of the prefabricated UHPC crossbeams, and the sides of the prefabricated UHPC bridge deck are connected as one unit by post-pouring strips. The prefabricated UHPC bridge deck is provided with a cast-in-place bridge deck made of ordinary concrete.

[0007] According to the above scheme, polyamide panels are installed on the inner side of the prefabricated UHPC side main beam.

[0008] According to the above scheme, a double-channel steel bar is installed on the top and bottom of the inner side of the precast UHPC side main beam by screws. The upper and lower edges of the polyamide board are each provided with a snap-fit ​​piece that is compatible with the double-channel steel bar. The snap-fit ​​piece is inserted into the double-channel steel bar and connected with screws to connect and fix the polyamide board to the precast UHPC side main beam.

[0009] According to the above scheme, a rubber sheet is fixed between the precast UHPC side main beam and the polyamide board.

[0010] According to the above scheme, the precast UHPC bridge deck is equipped with a steel truss. The lower part of the steel truss is embedded in the precast UHPC bridge deck, and the upper part of the steel truss extends into the cast-in-place bridge deck after it is poured.

[0011] According to the above scheme, a longitudinal prestressing tendon duct is opened in the middle of the precast UHPC side main beam, and a side main beam prestressing tendon that penetrates the longitudinal direction of the precast UHPC side main beam is provided in the side main beam prestressing tendon duct.

[0012] According to the above scheme, a number of bridge deck prestressing tendon ducts are arranged at intervals along the transverse direction on the precast UHPC bridge deck, and bridge deck prestressing tendons that penetrate the longitudinal direction of the precast UHPC bridge deck are provided in the bridge deck prestressing tendon ducts.

[0013] According to the above scheme, pre-embedded bars are arranged at the upper and lower ends of the prefabricated UHPC side main beam, and the ends of the pre-embedded bars extend out and are welded to the double channel steel bars to form a whole.

[0014] According to the above scheme, the length of the double-channel steel bar is the same as the length of the precast UHPC side main beam, the upper end of the top double-channel steel bar is flush with the precast UHPC side main beam, and the lower end of the bottom double-channel steel bar is flush with the precast UHPC bridge deck.

[0015] This invention also discloses a construction method for the prefabricated UHPC side main beam structure as described above, the method comprising the following steps:

[0016] Step 1: Fabricate precast UHPC side main beams, precast UHPC bridge decks, and precast UHPC crossbeams in the factory and transport them to the construction site;

[0017] Step 2: Erect two precast UHPC side main beam frames, the span of which shall be determined according to the actual situation of the project.

[0018] Step 3: Pass the prestressing tendons of the side main beam through the prestressing tendon ducts of the precast UHPC side main beam;

[0019] Step 4: Connect the precast UHPC bridge deck and precast UHPC crossbeams as a whole to the precast UHPC side main beam 1 through the post-cast strip;

[0020] Step 5: Pass the bridge deck prestressing tendons through the pre-reserved prestressing tendon ducts in the longitudinal direction of the precast UHPC bridge deck.

[0021] Step 6: Tension the prestressing tendons of the main beam and the bridge deck;

[0022] Step 7: Weld the double-channel steel bars to the exposed portions of the embedded reinforcement bars at the top and bottom ends of the precast UHPC side main beam to form a whole;

[0023] Step 8: Attach the rubber sheet to the inside of the precast UHPC side main beam using epoxy resin, so that the snap-fit ​​parts on the upper and lower edges of the polyamide sheet fit into the grooves of the double-channel steel strip, and fix it with screws.

[0024] Step 9: Cast ordinary concrete on the precast UHPC bridge deck to form a cast-in-place bridge deck. The cast-in-place bridge deck and the precast UHPC bridge deck form a composite bridge deck.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The side main beam structure in this invention is prefabricated using ultra-high performance concrete (UHPC), which has the advantages of small size, low self-weight, high strength, and convenient construction. It also has good operability, can improve the durability of the side main beam, and reduce later operating costs, making it feasible in engineering practice.

[0027] 2. In this invention, a polyamide board is provided on the inner side of the main beam. The plastic board made of this material has the advantages of strong impact resistance, good wear resistance, environmental protection and low cost. It can absorb the energy generated by external impact and play the role of energy consumption. It can solve the problem of bridge collapse caused by external impact during the operation of the main beam of the highway.

[0028] 3. The present invention fills the gaps between the side main beam and the polyamide plate with rubber sheets, which can further improve the overall impact resistance of the side main beam.

[0029] 4. This invention employs a composite bridge deck, with a precast UHPC bridge deck at the bottom and a regular concrete bridge deck cast on top. This reduces the lifting weight of the precast portion, decreases the amount of UHPC used, and lowers the bridge construction cost. Simultaneously, steel trusses are embedded within the two composite bridge decks, further improving the overall load-bearing capacity and integrity of the bridge deck.

[0030] 5. The prefabricated UHPC bridge deck of the present invention can reduce lateral prestress and simplify construction steps. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the prefabricated UHPC side main beam in this embodiment.

[0033] Figure 3 This is a schematic diagram showing the connection between the double-channel steel bar and the polyamide plate in this embodiment.

[0034] Figure 4 This is a schematic cross-sectional view of the double-channel steel bar in this embodiment.

[0035] Figure 5 This is a schematic diagram of the prefabricated UHPC bridge panel in this embodiment.

[0036] Figure 6 This is a cross-sectional view of the prefabricated UHPC bridge deck and the prefabricated UHPC crossbeam in this embodiment.

[0037] Figure 7 This is a schematic diagram showing the connection between the prefabricated UHPC bridge deck, the prefabricated UHPC crossbeam, and the prefabricated UHPC side main beam in this embodiment.

[0038] In the diagram: 1. Precast UHPC side main beam; 2. Double-channel steel bar; 3. Polyamide board; 3.1. Clip-on component; 4. Precast UHPC bridge deck; 5. Cast-in-place bridge deck; 6. Precast UHPC crossbeam; 7. Prestressed tendons of side main beam; 8. Rubber sheet; 9. Embedded reinforcement; 10. Steel truss; 10.1. Bottom chord reinforcement; 10.2. Top chord reinforcement; 10.3. Web reinforcement; 11. Post-cast strip; 12. Prestressed tendons of bridge deck. Detailed Implementation

[0039] To better understand the present invention, it will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1The diagram shows a prefabricated UHPC side beam structure with anti-collision polyamide panels 3 for highways, comprising two prefabricated UHPC side beams 1 and a prefabricated UHPC bridge deck 4. The two prefabricated UHPC side beams 1 are symmetrically distributed on both sides of the prefabricated UHPC bridge deck 4. Several spaced and parallel prefabricated UHPC crossbeams 6 are located at the bottom of the prefabricated UHPC bridge deck 4. The bottom of the prefabricated UHPC side beams 1, the ends of the prefabricated UHPC crossbeams 6, and the sides of the prefabricated UHPC bridge deck 4 are connected as one unit by post-cast strips 11. The prefabricated UHPC bridge deck 4 is provided with a cast-in-place bridge deck 5 made of ordinary concrete.

[0041] In this invention, the precast UHPC side main beam 1 is the main load-bearing component, which is precast from ultra-high performance concrete (UHPC) and is segmented along the longitudinal direction; the cross-section of the precast UHPC side main beam 1 can be rectangular, I-shaped or box-shaped, etc.

[0042] In this invention, the precast UHPC bridge deck 4 and the precast UHPC crossbeam 6 are precast together using ultra-high performance concrete (UHPC), and the two are connected to the precast UHPC side main beam 1 by a post-cast strip 11.

[0043] In this invention, the cast-in-place bridge deck 5 is made of ordinary concrete and cast on the precast UHPC bridge deck 4, forming an integral bridge deck. The superimposed bridge deck can reduce the lifting weight of the precast components and reduce the amount of UHPC used. At the same time, the precast part of the bridge deck can be used as a template for the cast-in-place part during construction, which can facilitate construction and save costs.

[0044] Preferably, a polyamide plate 3 is installed on the inner side of the precast UHPC side main beam 1 (i.e., the side facing the precast UHPC bridge deck 4); specifically, a double-channel steel bar 2 is installed on the top and bottom of the inner side of the precast UHPC side main beam 1 by screws, and the upper and lower edges of the polyamide plate 3 are each provided with a snap-fit ​​fitting adapted to the double-channel steel bar 2. The snap-fit ​​fitting is inserted into the double-channel steel bar 2 and connected with screws to connect and fix the polyamide plate 3 to the precast UHPC side main beam 1. Figure 3 and 4 As shown, the double-groove steel bar 2 includes two steel bars, an upper and a lower one, with a groove formed between the two steel bars, and the snap-fit ​​part 3.1 of the polyamide plate 3 is installed in the groove.

[0045] In this embodiment, the polyamide board 3 is perpendicular to the precast UHPC bridge deck 4, improving the impact resistance of the side main beam; the length of the double-channel steel strip 2 is consistent with the length of the precast UHPC side main beam 1, the upper end face of the top double-channel steel strip 2 is flush with the precast UHPC side main beam 1, and the lower end face of the bottom double-channel steel strip 2 is in contact with the cast-in-place bridge deck 5. Figure 4 As shown,

[0046] Preferably, a rubber sheet 8 is fixed between the precast UHPC side main beam 1 and the polyamide board 3. In this invention, the rubber sheet 8 is bonded to the inner side of the side main beam with epoxy resin, serving an energy-dissipating function.

[0047] Preferably, the precast UHPC bridge deck 4 is equipped with a steel truss 10, the lower part of which is embedded in the precast UHPC bridge deck 4, and the upper part of which extends into the cast-in-place bridge deck 5. In this invention, the steel truss 10 includes a lower chord steel bar 10.1 in the precast UHPC bridge deck 4, an upper chord steel bar 10.2 in the cast-in-place bridge deck 5, and web steel bars 10.3 connecting the upper and lower chord steel bars. The embedding of the steel truss 10 enhances the shear resistance of the bridge deck composite interface, improves the structural stress, ensures the bond strength of the interlayer concrete, and further improves and protects the overall stress performance of the bridge deck.

[0048] Preferably, the precast UHPC side main beam 1 has longitudinal prestressing tendon 7 ducts in its middle, and the side main beam prestressing tendons 7 are arranged in the side main beam prestressing tendon 7 ducts, penetrating longitudinally through the precast UHPC side main beam 1. In this embodiment, the side main beam prestressing tendons 77 can not only improve the stress performance of the precast UHPC side main beam 1, reduce the size of the precast UHPC side main beam 1, and reduce the cost, but also serve as temporary fixing tools for connecting the various beam sections during construction.

[0049] Preferably, the precast UHPC bridge deck 4 has a plurality of bridge deck prestressing tendon channels arranged at transverse intervals, and the bridge deck prestressing tendon 12 penetrating the longitudinal direction of the precast UHPC bridge deck 4 is provided in the bridge deck prestressing tendon channels. In this embodiment, the bridge deck prestressing tendon 12 can improve the stress of the bridge deck, reduce the size and material usage of the precast UHPC bridge deck 4, and reduce the cost.

[0050] Preferably, the upper and lower ends of the prefabricated UHPC side main beam 1 are each provided with embedded reinforcement bars 9, the ends of which extend out and are welded to the double channel steel bar 2 to form a whole.

[0051] The present invention also provides a construction method for the prefabricated UHPC side main beam structure as described above, the method comprising the following steps:

[0052] Step 1: Fabricate precast UHPC side main beams 1, precast UHPC bridge deck 4, and precast UHPC crossbeams 6 in the factory and transport them to the construction site.

[0053] Step 2: Erect the two precast UHPC side main beams 1. The span of the two precast UHPC side main beams 1 is determined according to the actual situation of the project.

[0054] Step 3: Pass the prestressing tendons 7 of the side main beam through the prestressing tendon 7 ducts of the precast UHPC side main beam 1.

[0055] Step 4: Connect the precast UHPC bridge deck 4 and the precast UHPC crossbeam 6 together to the precast UHPC side main beam 11 through the post-cast strip 11.

[0056] Step 5: Pass the bridge deck prestressing tendon 12 through the pre-reserved bridge deck prestressing tendon duct in the longitudinal direction of the precast UHPC bridge deck 4.

[0057] Step 6: Tension the prestressing tendons 7 of the main beam and the prestressing tendons 12 of the bridge deck.

[0058] Step 7: Weld the double-channel steel bar 2 to the exposed portion of the embedded reinforcement 9 at the upper and lower ends of the precast UHPC side main beam 1 to form a whole.

[0059] Step 8: Attach the rubber sheet 8 to the inside of the precast UHPC side main beam 1 with epoxy resin, so that the snap-fit ​​parts of the upper and lower edges of the polyamide sheet 3 fit into the grooves of the double-channel steel strip 2, and fix them with screws.

[0060] Step 9: Cast ordinary concrete on the precast UHPC bridge deck 4 to form the cast-in-place bridge deck 5. The cast-in-place bridge deck 5 and the precast UHPC bridge deck 4 form a composite bridge deck.

[0061] In this invention, the precast UHPC side main beam 1 is made of ultra-high performance concrete (UHPC). Compared with ordinary concrete, under the same stress conditions, the weight of the UHPC structure is about half that of reinforced concrete, which can reduce the size and weight of the structure, making the precast components easier to transport and hoist, and ensuring that the overall structural strength is not weakened. In this invention, the bridge deck is divided into precast and cast-in-place parts. The precast part uses UHPC, and the cast-in-place part uses ordinary concrete, making the two a composite bridge deck. This reduces the hoisting weight of the bridge deck, reduces the amount of UHPC used, and significantly reduces the cost of the bridge. Steel trusses 10 are arranged between the composite surfaces of the bridge deck to improve the structural stress and enhance the overall integrity of the bridge deck.

[0062] This invention involves placing a polyamide plate on the inner side of the precast UHPC side main beam 1. The polyamide plastic plate has strong impact resistance, good wear resistance, and good heat resistance, and is widely used in automobiles, transportation equipment, machinery and other fields. A rubber plate 8 is filled in the gap between the precast UHPC side main beam 1 and the polyamide plate 3, which further improves the overall impact resistance of the side main beam and can absorb the energy generated by external impact, thus playing an excellent energy dissipation role.

[0063] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-collision assembled UHPC side girder structure, characterized in that, The application relates to a prefabricated UHPC bridge deck slab, which comprises two prefabricated UHPC side main beams and a prefabricated UHPC bridge deck slab, the two prefabricated UHPC side main beams are symmetrically arranged on the two sides of the prefabricated UHPC bridge deck slab, the bottom of the prefabricated UHPC bridge deck slab is provided with a plurality of spaced and parallel prefabricated UHPC cross beams, the bottom of the prefabricated UHPC side main beam, the end of the prefabricated UHPC cross beam and the side of the prefabricated UHPC bridge deck slab are connected through post-poured belts, and the prefabricated UHPC bridge deck slab is provided with a cast-in-situ bridge deck slab which is formed by pouring ordinary concrete. The inner side of the prefabricated UHPC side main beam is provided with a polyamide plate. A double-groove steel strip is arranged on the inner top and bottom of the prefabricated UHPC side main beam through screws, the upper and lower edges of the polyamide plate are respectively provided with clamping pieces matched with the double-groove steel strip, the clamping pieces are inserted into the double-groove steel strip, and the polyamide plate is connected and fixed with the prefabricated UHPC side main beam through screws. A rubber plate is fixed between the prefabricated UHPC side main beam and the polyamide plate. The prefabricated UHPC side main beam is provided with a longitudinal side main beam prestressed tendon hole in the middle part, and the side main beam prestressed tendon hole is provided with a side main beam prestressed tendon which penetrates the prefabricated UHPC side main beam longitudinally. The length of the double-groove steel strip is consistent with the length of the prefabricated UHPC side main beam, the upper end surface of the top double-groove steel strip is flush with the prefabricated UHPC side main beam, and the lower end surface of the bottom double-groove steel strip is flush with the prefabricated UHPC bridge deck slab.

2. The precast UHPC edge girder structure of claim 1, wherein, The prefabricated UHPC bridge deck slab is provided with a steel bar truss, the lower part of the steel bar truss is embedded in the prefabricated UHPC bridge deck slab, and the upper part of the steel bar truss extends into the post-poured cast-in-situ bridge deck slab.

3. The precast UHPC edge girder structure of claim 2, wherein, The prefabricated UHPC bridge deck slab is provided with a plurality of bridge deck slab prestressed tendon holes which are arranged in the transverse direction, and the bridge deck slab prestressed tendon holes are provided with bridge deck slab prestressed tendons which penetrate the prefabricated UHPC bridge deck slab longitudinally.

4. The precast UHPC edge girder structure of claim 3, wherein, The upper end and the lower end of the prefabricated UHPC side main beam are respectively arranged with embedded bars, and the end parts of the embedded bars extend out and are welded with the double-groove steel strip to form an integral whole.

5. The construction method of the fabricated UHPC edge girder structure according to claim 4, characterized in that, The method comprises the following steps: Step one, prefabricated UHPC side main beams, prefabricated UHPC bridge deck slabs and prefabricated UHPC cross beams are manufactured in a factory and are transported to a construction site; Step two, two prefabricated UHPC side main beam frames are erected, and the span of the two frames is determined according to the actual engineering project; Step three, side main beam prestressed tendons are arranged to pass through the side main beam prestressed tendon holes of the prefabricated UHPC side main beams; Step four, the prefabricated UHPC bridge deck slabs and the prefabricated UHPC cross beams are integrally connected with the prefabricated UHPC side main beams through post-poured belts; Step five, bridge deck slab prestressed tendons are arranged to pass through the bridge deck slab prestressed tendon holes which are longitudinally reserved in the prefabricated UHPC bridge deck slabs; Step six, the side main beam prestressed tendons and the bridge deck slab prestressed tendons are tensioned; Step seven, the double-groove steel strips are welded with the exposed parts of the embedded bars at the upper and lower ends of the prefabricated UHPC side main beams to form an integral whole; Step eight, the rubber plate is attached to the inner side of the prefabricated UHPC side main beam through epoxy resin, the clamping pieces at the upper and lower edges of the polyamide plate are embedded into the grooves of the double-groove steel strips, and the clamping pieces are fixed through screws; Step nine, ordinary concrete is cast in the prefabricated UHPC bridge deck slabs to form cast-in-situ bridge deck slabs, and the cast-in-situ bridge deck slabs and the prefabricated UHPC bridge deck slabs form an integral composite bridge deck slab.

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