Aluminum alloy pipe uhpc arch bridge and construction method thereof
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGXI UNIV
- Filing Date
- 2026-04-30
- Publication Date
- 2026-06-12
Smart Images
Figure CN122190142A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of bridge technology, and in particular to aluminum alloy tube UHPC arch bridges and their construction methods. Background Technology
[0002] Arch bridges are one of the main structural forms of highway bridges in my country. Reinforced concrete arch bridges can fully utilize the compressive strength of concrete and the tensile strength of steel. However, the main arch ring of traditional reinforced concrete arch bridges is mostly constructed by erecting scaffolds and casting on site, which is a complicated and time-consuming construction process.
[0003] To address the challenges of complex construction processes and long construction periods for arch bridges, relevant technologies, such as the UHPC wet joint connection method described in patent CN112796198B, employ a hollow arch bridge system and construction method. This scheme utilizes concrete foundations, abutments, arch seats, precast assembled rib arches, spandrel piers, and bridge deck slabs to form the main structure. The main arch ring is precast in segments and then joined together using cable hoisting. The segments are connected by UHPC wet joints. The arch seats and the arch ring edges are connected by welding pre-embedded steel bars and pouring ordinary concrete. The spandrel piers are connected to the bottom beam and cap beam using a combination of steel bar welding, cast-in-place concrete, and high-strength mortar sealing. This approach improves construction efficiency and shortens the construction period to a certain extent.
[0004] However, the arch ring itself in the above-mentioned arch bridge system has insufficient structural stiffness and stability, and the overall stress performance after the prefabricated segments are spliced is limited; the reliability of the node connection between the arch abutment and the arch ring edge, the web pier and the bottom beam and cap beam is poor; the connection structure of the UHPC wet joint and the steel reinforcement connection process are not fully matched with the stress characteristics of the arch bridge, and the overall structural stability and connection durability are difficult to meet the requirements of long-term service and complex load action.
[0005] In summary, existing arch bridge technology cannot simultaneously achieve both high construction efficiency and structural safety. There is an urgent need to develop an arch bridge structure and its construction method that offers higher structural stability, more reliable node connections, and superior stress performance, in order to meet the construction needs of modern bridge industrialization, greening, and high performance. Summary of the Invention
[0006] Therefore, it is necessary to provide an aluminum alloy tube UHPC arch bridge and its construction method to address the above problems.
[0007] A construction method for an aluminum alloy tube UHPC arch bridge, the construction method comprising: Step S1: Aluminum alloy tubes are installed on two spaced bridge platforms to form aluminum alloy arch ribs, and the arch feet at both ends of the aluminum alloy tubes are placed on the bridge platforms. Step S2: After installing the anchoring components on the arch foot, pour UHPC concrete on the bridge abutment for the first time to form the first part of the arch seat, so that the first part of the arch seat covers part of the anchoring components. Step S3: Install connecting components on the solid section of the aluminum alloy tube, wherein the aluminum alloy tube includes a solid section in the middle, hollow sections on both sides of the solid section, and arched feet at both ends of the aluminum alloy tube. Step S4: Pump and inject UHPC concrete into the aluminum alloy tube to form the UHPC arch rib of the aluminum alloy tube; Step S5: Cast the bridge deck onto the connecting assembly so that the bridge deck is connected to the solid web section of the aluminum alloy tube through the connecting assembly; Step S6: Pour UHPC concrete a second time on the bridge abutment to form the second part of the arch seat. The second part is located above the first part so that the arch seat completely covers the anchoring components and the arch foot.
[0008] In one embodiment, step S2: installing anchoring components on the arch foot includes: A connecting steel cage is inserted inside the aluminum alloy tube, so that one end of the connecting steel cage is inserted inside the aluminum alloy tube and the other end is located outside the arch foot of the aluminum alloy tube. Weld a circular anchor plate to the end of the aluminum alloy tube; Multiple spaced anchoring holes are opened on the outer wall of the arch foot of the aluminum alloy tube, and GFRP bars are inserted into each anchoring hole to form an anchoring assembly. Apply a layer of epoxy mortar to the outer wall of the arch foot, and pour UHPC concrete to form the arch base during the curing period of the epoxy mortar.
[0009] In one embodiment, the upper end of the axial reinforcing bar of the connecting steel cage extends into the aluminum alloy tube and is grouted with UHPC concrete for a length not less than 8 times the diameter of the axial reinforcing bar, and the lower end of the axial reinforcing bar of the connecting steel cage extends out of the end face of the aluminum alloy tube for a length not less than 8 times the diameter of the axial reinforcing bar; and after the strength of the first poured UHPC concrete reaches more than 30MPa, the second grouted UHPC concrete is grouted into the aluminum alloy tube.
[0010] In one embodiment, the inner diameter of the annular anchor plate is the same as the diameter at half the wall thickness of the aluminum alloy tube, and the thickness of the annular anchor plate is 0.5 to 1.2 times the width extending outward from the aluminum alloy tube; the minimum width of the annular anchor plate is... In the formula: The absolute value of the most unfavorable compressive stress in the basic combination of aluminum alloy tubes at the arch foot section; The absolute value of the most unfavorable tensile stress in the basic combination of aluminum alloy tubes at the arch foot section; This represents the design value for the compressive strength of UHPC; This represents the design value for the tensile strength of UHPC. The wall thickness of the aluminum alloy tube; The ratio of the axial force of the aluminum alloy tube transmitted to the circular anchor plate is generally 0.5~0.8.
[0011] In one embodiment, a plurality of spaced-apart anchoring holes are provided on the outer wall of the arch foot of the aluminum alloy tube, including: Multiple spaced anchor holes are made on the outer wall of the arch foot of the aluminum alloy tube, evenly distributed along the circumference, with a total of n holes, and arranged along the axis of the aluminum alloy tube according to the force transmission requirements. Row, , The design value of shear bearing capacity of UHPC and its GFRP reinforcement with a single anchor hole in aluminum alloy tube; The shear bearing capacity required for the UHPC and GFRP reinforcement within a single row of anchor holes in the aluminum alloy tube. In the formula: The ratio of the GFRP reinforcement in the anchoring hole of the aluminum alloy tube to transmit the axial force of the aluminum alloy tube can generally be taken as 0.6~1.2. This refers to the diameter of the aluminum alloy tube.
[0012] In one embodiment, step S3 includes: opening a plurality of spaced connection holes on the outer wall of the solid web section of the aluminum alloy tube facing the bridge deck, and inserting GFRP connecting bars in each connection hole; installing a template on the solid web section to form a casting space. Step S4 includes: jacking up and injecting UHPC concrete into the aluminum alloy tube until the pouring space on the solid section is filled with UHPC concrete to form a connecting seat, and filling the aluminum alloy tube with UHPC concrete to form the aluminum alloy tube UHPC arch rib. Step S5 includes: once the strength of the connecting seat reaches 30MPa or more, roughening the part connecting to the bridge deck concrete, and pouring the construction bridge deck on the connecting component so that the bridge deck is connected to the solid section of the aluminum alloy pipe through the connecting component.
[0013] An aluminum alloy tube UHPC arch bridge is constructed using the construction method described above. The aluminum alloy tube UHPC arch bridge includes two abutments, an arch rib, a bridge deck, and an arch seat, with the two abutments spaced apart. The arch rib comprises an aluminum alloy tube and UHPC concrete poured into the aluminum alloy tube. The aluminum alloy tube includes two arch feet, two hollow sections, and a solid section. The solid section is located between the two hollow sections, and the two arch feet are located at the ends of the two hollow sections away from the solid sections. The bridge deck is mounted on the arch rib and connected to the solid section via connecting components. The arch seat is formed on the abutment by pouring UHPC concrete, and the arch feet are fixed within the arch seat by anchoring components.
[0014] In one embodiment, the anchoring assembly includes GFRP bars, and a plurality of spaced-apart anchoring holes are provided on the outer wall of the arch foot. A GFRP bar is inserted into each anchoring hole so that one end of the GFRP bar is anchored in the UHPC concrete inside the aluminum alloy tube, and the other end is anchored in the arch seat. The plurality of anchoring holes are spaced apart around the axis of the aluminum alloy tube. A circular anchoring plate is provided at the end of the arch foot. A connecting steel cage is inserted through the aluminum alloy tube so that one end of the connecting steel cage is located inside the aluminum alloy tube and anchored in the UHPC concrete inside the aluminum alloy tube, and the other end extends out of the end of the aluminum alloy tube and is anchored in the arch seat.
[0015] In one embodiment, the aluminum alloy tube at the solid web section has multiple spaced connection holes on the outer wall of the bridge deck. The connection assembly includes GFRP connecting bars and connecting seats. Each connection hole is provided with a GFRP connecting bar. The connecting seat is formed by pouring UHPC concrete. The connecting seat is located between the bridge deck and the solid web section and connects the bridge deck and the solid web section. One end of the GFRP connecting bar is anchored in the UHPC concrete inside the aluminum alloy tube, and the other end is anchored in the connecting seat.
[0016] In one embodiment, each cross-section of the aluminum alloy tube in the solid section is provided with 5 connecting holes, one of which is located at the top and two on each side; along the length of the aluminum alloy tube, the distance between two adjacent connecting holes is greater than or equal to 12cm, the diameter of the connecting holes is 4cm to 8cm, and the diameter of the GFRP connecting rib is 22mm to 28mm.
[0017] The aforementioned aluminum alloy tube UHPC arch bridge and its construction method have at least the following advantages compared to existing technologies: An aluminum alloy tube is used as the external load-bearing skeleton, and UHPC concrete is poured inside the tube to form an integrated composite arch rib. The arch rib is divided into a solid section and two hollow sections. The aluminum alloy arch rib is only connected to the bridge deck at the mid-span solid section through connecting components, so that the height direction partially overlaps. This satisfies the requirement of hollow sections for small-span arch bridges, increases the water passage area, and reduces the arch bridge height and approach road length. At the same time, the solid section provides strong lateral restraint to the arch rib, enhancing its stability. Anchoring components are added at the arch foot and arch seat, combined with two-layer casting of UHPC-formed arch seats: the first layer is cast to cover the partial anchoring components, and the second layer is cast to cover the anchoring components and aluminum alloy arch foot, achieving a rigid full-coverage connection between the arch foot and arch seat; at the same time, high-performance UHPC is used, which has excellent bonding strength and shear resistance. The arch ribs in this application are integral structures. The aluminum alloy tubes are corrosion-resistant and not easily rusted. The UHPC material has excellent anti-permeability, anti-freeze-thaw, anti-fatigue, and anti-corrosion properties, which greatly improves the overall durability and service life of the bridge and reduces the cost of later maintenance and repair. Attached Figure Description
[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown in the drawings only as examples and not necessarily to actual scale.
[0021] Figure 1 This is a flowchart illustrating the construction method of an aluminum alloy tube UHPC arch bridge in one embodiment.
[0022] Figure 2 This is a schematic diagram of the structure of an aluminum alloy tube UHPC arch bridge in one embodiment.
[0023] Figure 3 for Figure 2 The structural diagram of the arch foot, arch seat and abutment.
[0024] Figure 4 for Figure 3 A cross-sectional view along the EE line.
[0025] Figure 5 for Figure 3 A cross-sectional view along the FF line.
[0026] Figure 6 for Figure 3 A top view of the connecting steel cage.
[0027] Figure 7 for Figure 2 A cross-sectional view along line BB.
[0028] Figure 8 for Figure 7 A magnified view of the aluminum alloy tube and connecting components.
[0029] Figure 9 for Figure 8 A top view of the solid section of the aluminum alloy tube.
[0030] Explanation of reference numerals in the attached figures: Aluminum alloy tube UHPC arch bridge 10; aluminum alloy tube 100; arch foot 110; anchor hole 112; solid web section 120; connecting hole 122; hollow web section 130; connecting steel cage 140; axial steel bar 142; GFRP stirrup 144; circular anchor plate 150; GFRP bar 160; arch seat 200; connecting component 300; GFRP connecting bar 310; connecting seat 320; bridge deck 400; bridge abutment 500; bridge abutment 20. Detailed Implementation
[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0032] See Figure 1 and Figure 2 The construction method of the aluminum alloy tube UHPC arch bridge 10 in one embodiment of this application can at least improve structural stability and improve the reliability of node connections. Specifically, the construction method of the aluminum alloy tube UHPC arch bridge 10 includes: Step S1: Aluminum alloy pipes 100 are installed on two spaced bridge abutments 20 to form aluminum alloy arch ribs, and the arch feet 110 at both ends of the aluminum alloy pipes 100 are set on the bridge abutments 20. Step S2: After installing the anchoring components on the arch foot 110, pour UHPC concrete on the abutment 20 for the first time to form the first part of the arch seat 200 so that the first part of the arch seat 200 covers part of the anchoring components. Step S3: A connecting assembly 300 is provided on the solid section 120 of the aluminum alloy tube 100, wherein the aluminum alloy tube 100 includes a solid section 120 located in the middle and hollow sections 130 located on both sides of the solid section 120. Step S4: Pump and inject UHPC concrete into the aluminum alloy tube 100 to form the UHPC arch rib of the aluminum alloy tube; Step S5: Cast the bridge deck 400 on the connecting component 300 so that the bridge deck 400 is connected to the solid web section 120 of the aluminum alloy tube 100 through the connecting component 300. Step S6: A second pour of UHPC concrete is made on the abutment 20 to form the second part of the arch seat 200, which is located above the first part, so that the arch seat 200 completely covers the anchoring components and the arch foot 110.
[0033] The construction method of the aforementioned aluminum alloy tube UHPC arch bridge 10 uses aluminum alloy tube 100 as the external load-bearing skeleton, and UHPC concrete is poured into the tube to form an integrated arch rib. The arch rib is divided into a solid web section 120 and two hollow web sections 130. The aluminum alloy arch rib is only connected to the bridge deck 400 at the solid web section 120 in the middle of the span through connecting components 300, so that they partially overlap in the height direction. This satisfies the requirement of setting hollow webs for small-span arch bridges, increases the water passage area, reduces the arch bridge height, and reduces the approach road length. At the same time, the solid web section 120 provides strong lateral restraint for the arch rib, enhancing the stability of the arch rib. Anchoring components are added at the arch foot 110 and arch seat 200, and the UHPC-formed arch seat 200 is cast in two layers: the first layer is cast to cover the partial anchoring components, and the second layer is cast to cover the anchoring components and the aluminum alloy arch foot 110, realizing a rigid full-coverage connection between the arch foot 110 and the arch seat 200; at the same time, high-performance UHPC is used, which has excellent bonding strength and shear resistance. The arch ribs in this application are integral structures. The aluminum alloy tubes are corrosion-resistant and not prone to rust, while the UHPC material has excellent anti-permeability, freeze-thaw resistance, fatigue resistance, and corrosion resistance, which greatly improves the overall durability and service life of the bridge and reduces the cost of later maintenance and repair.
[0034] In this embodiment, aluminum alloy, with its high specific strength and excellent corrosion resistance, is an ideal confinement material. Ultra-high performance concrete (UHPC), through optimized aggregate gradation and the incorporation of steel fibers, achieves ultra-high compressive strength, low permeability, and good durability. The synergistic effect of both is expected to significantly improve the load-bearing capacity and durability of the structure, and reduce subsequent maintenance costs. However, when aluminum alloy comes into contact with concrete (containing UHPC), the slightly water-soluble calcium hydroxide in the concrete provides a high concentration of OH radicals. - Ions dissolve the dense alumina on the surface, gradually exposing the internal metallic aluminum. The exposed metallic aluminum (Al) undergoes a more severe corrosion reaction with hydroxide ions and water, generating hydrogen gas and dissolving. Considering the density of UHPC, the tensile stress is less than the cracking stress under conditions that prevent cracking, making it difficult for external moisture to penetrate. However, in the early stages of hardening, the alkaline pore water environment is present, but due to the very low water-cement ratio of UHPC, even if pore water exists, its content is very low, and the corrosion phenomenon can be ignored. Therefore, the aluminum alloy tube 100 UHPC arch rib structure proposed in this application will not experience a decrease in bonding strength or corrosion of the aluminum alloy tube 100.
[0035] See Figures 2 to 6 In one embodiment, step S2: installing anchoring components on the arch foot 110 includes: Step S21: Insert a connecting steel cage 140 inside the aluminum alloy tube 100, so that one end of the connecting steel cage 140 is inserted inside the aluminum alloy tube 100 and the other end is located outside the arch foot 110 of the aluminum alloy tube 100.
[0036] Specifically, the connecting steel cage 140 includes multiple spaced axial steel bars 142 and GFRP stirrups 144. The upper end of the axial steel bars 142 extends into the UHPC arch rib of the aluminum alloy tube 100 formed by the pressure injection of UHPC concrete, with a length not less than 8 times the diameter of the axial steel bars 142. The lower end of the axial steel bars 142 of the connecting steel cage 140 extends out of the end face of the aluminum alloy tube 100 with a length not less than 8 times the diameter of the axial steel bars 142. One end of the connecting steel cage 140 is internally inserted into the aluminum alloy tube 100, and the other end extends out to the outside of the arch foot 110, forming a continuous load-bearing skeleton between the aluminum alloy tube 100 and the UHPC injected into the tube and the arch seat 200. The upper end of the axial steel bars 142 is anchored into the second part of the arch seat 200, and the lower end extends out of the end face of the aluminum alloy tube 100, providing bidirectional anchorage with an anchorage length not less than 8 times the diameter of the axial steel bars 142, thereby improving the bond strength and adhesion between the steel bars and the UHPC.
[0037] Furthermore, the minimum area of the axial reinforcing bars 142 connecting the reinforcing cage 140. for: In the formula: This represents the maximum tensile stress of the UHPC under the basic combination of the 110 section at the arch foot; The design value of the tensile strength of the connecting steel bars of the arch abutment 200; The radius of the UHPC inside the aluminum alloy tube 100 is the inner radius of the aluminum alloy tube 100. The connecting steel cage 140 must be placed inside the aluminum alloy tube 100 at the arch foot 110 before the construction of all the arch ribs at the arch seat 200.
[0038] In this embodiment, the top-pressure grouting of UHPC concrete inside the aluminum alloy tube 100 is carried out only after the strength of the first-poured UHPC concrete reaches 30MPa or higher. To ensure the rebar connection length of the UHPC construction joint inside the aluminum alloy tube 100, the second UHPC concrete pouring is carried out after the strength of the first-poured UHPC reaches 30MPa or higher and the surface is roughened. Attention should be paid to coordinating the inlet setting of the UHPC grouting inside the aluminum alloy tube 100 with the timing of the second UHPC pouring at the arch seat 200. Specifically, the second pouring is carried out only after the strength of the first-poured UHPC reaches 30MPa or higher to avoid the unhardened lower layer of UHPC being impacted and squeezed by the load of the upper layer. Simultaneously, the timing of injecting UHPC concrete into the aluminum alloy tube 100 is controlled between the two pouring of the arch seat 200. The first pouring of the arch seat 200 can first cover the lower part of the anchoring component and the foundation section of the arch foot 110, which can fix the installation position of the connecting steel cage 140 and the aluminum alloy arch foot 110 in advance, preventing the subsequent construction process from disturbing the steel reinforcement, causing the arch foot 110 to be misaligned, and the component to be off-center, thus improving the construction accuracy.
[0039] Step S22: Weld a circular anchor plate 150 to the end of the aluminum alloy tube 100.
[0040] Specifically, the inner diameter of the annular anchor plate 150 is the same as the diameter at half the wall thickness of the aluminum alloy tube 100, and the thickness of the annular anchor plate 150 is 0.5 to 1.2 times the width extending outward from the aluminum alloy tube 100; wherein, the minimum width of the annular anchor plate 150 is... In the formula: The absolute value of the most unfavorable compressive stress for the basic combination of 100 aluminum alloy tubes with a 110 cross section at the arch foot. The absolute value of the most unfavorable tensile stress in the basic combination of 100 aluminum alloy tubes with a 110 cross section at the arch foot; This represents the design value for the compressive strength of UHPC; This represents the design value for the tensile strength of UHPC. The wall thickness of the aluminum alloy tube is 100. The ratio by which the axial force of the aluminum alloy tube 100 is transmitted to the circular anchor plate 150 is generally 0.5~0.8.
[0041] An integral circular anchor plate 150 is welded to the end of the aluminum alloy tube 100, serving as a rigid force-transfer transition between the aluminum alloy tube 100 and the UHPC of the arch seat 200, thus expanding the contact bearing surface. The inner diameter of the circular anchor plate 150 matches the diameter at half the wall thickness of the aluminum alloy tube 100, facilitating welding positioning and improving coaxiality. The thickness of the circular anchor plate 150 is limited to 0.5 to 1.2 times the overhang width to prevent bending and tearing failure under high pressure and shearing at the arch foot 110 due to excessive thickness; and to avoid abrupt changes in local stiffness due to excessive thickness, reducing secondary temperature stress and shrinkage cracks at the joint. The minimum width of the circular anchor plate 150 matches the ultimate load of the arch bridge and the alternating vehicle load, ensuring that the local bearing capacity and tensile strength of the circular anchor plate 150 match those of the UHPC under extreme stress.
[0042] Step S23: Multiple spaced anchoring holes 112 are opened on the outer wall of the arch foot 110 of the aluminum alloy tube 100, and GFRP bars 160 are inserted into each anchoring hole 112 to form an anchoring assembly.
[0043] Specifically, multiple spaced anchor holes 112 are provided on the outer wall of the arch foot 110 of the aluminum alloy tube 100, evenly distributed along the circumference, with a total of n holes, and arranged along the axial direction of the aluminum alloy tube 100 according to the force transmission requirements. Arrangement; among them, , The design value of shear bearing capacity of UHPC and its GFRP reinforcement 160 for aluminum alloy tube 100 with single anchor hole 112; The shear bearing capacity required for the UHPC and its GFRP reinforcement 160 within the single row of anchor holes 112 of the aluminum alloy tube 100. In the formula: The ratio of the GFRP reinforcement 160 that transmits the axial force of the aluminum alloy tube 100 to the anchor hole 112 of the aluminum alloy tube 100 can generally be taken as 0.6~1.2. The diameter of the aluminum alloy tube is 100 mm. Specifically, The diameter is the centerline diameter of the aluminum alloy tube with a wall thickness of 100 mm. Furthermore, it meets the following requirements: Take a number greater than 1.0.
[0044] Anchor holes 112 are evenly distributed around the outer circumference of the arch foot 110 of the aluminum alloy tube 100, ensuring circumferential force transmission without eccentricity. One or at least two rows of anchor holes 112 are set along the arch axis, precisely configured according to the actual axial force to be transmitted and the bearing capacity of a single anchor hole 112. The GFRP reinforcement 160 itself has excellent acid and alkali resistance, freeze-thaw resistance, aging resistance, and corrosion resistance, which can improve the long-term durability of the arch foot 110 anchoring components and reduce later node defects and maintenance costs. GFRP reinforcement 160 is inserted into the anchor holes 112 to form a mechanical interlocking anchoring structure. The GFRP reinforcement 160 penetrates the wall of the aluminum alloy tube 100 and is embedded inside the arch seat 200UHPC, directly transmitting the axial force and shear force of the aluminum alloy tube 100 to the external arch seat 200 through mechanical shearing and tensioning.
[0045] Step S24: Apply a layer of epoxy mortar to the outer wall of the arch foot 110, and pour UHPC concrete to form the arch seat 200 during the curing period of the epoxy mortar.
[0046] Specifically, since the UHPC arch 200 and aluminum alloy tube 100 are partially subjected to tension during operation, in order to improve the durability of the aluminum alloy tube 100 within the UHPC arch 200, a layer of epoxy mortar with a curing period of more than 7 days should be applied to the outer part of the arch foot 110 of the aluminum alloy tube 100 in contact with the UHPC of the arch 200. The UHPC should then be poured within 3-6 days of the curing period to form the arch 200, ensuring bonding strength. After curing, the glass transition temperature of the epoxy mortar should not be lower than 65℃, and the room temperature tensile strength should not be lower than 60MPa. Pouring the UHPC within the 3-6 day curing period allows the epoxy mortar to achieve stable strength, possessing both bonding toughness and deformation adaptability. This prevents the epoxy mortar from being eroded and damaged by the pouring of the UHPC before curing, and also prevents the material from becoming too hard and reducing bonding strength after complete curing.
[0047] In one embodiment, step S3 includes: opening a plurality of spaced connection holes 122 on the outer wall of the solid web section 120 of the aluminum alloy tube 100 facing the bridge deck 400, and inserting GFRP connecting ribs 310 through each connection hole 122; and installing a template on the solid web section 120 to form a casting space. Step S4 includes: jacking up and injecting UHPC concrete into the aluminum alloy tube 100 until the pouring space on the solid section 120 is filled with UHPC concrete to form the connecting seat 320, and filling the aluminum alloy tube 100 with UHPC concrete to form the UHPC arch rib of the aluminum alloy tube 100. Step S5 includes: once the strength of the connecting seat 320 reaches 30MPa or more, roughening the concrete connection part with the bridge deck 400, and pouring the construction bridge deck 400 on the connecting component 300 so that the bridge deck 400 is connected to the solid web section 120 of the aluminum alloy tube 100 through the connecting component 300.
[0048] Specifically, each cross-section of the solid web section 120 of the aluminum alloy tube 100 has five connecting holes 122: one at the top and two on each side. The distance between two adjacent connecting holes 122 is no less than 12cm along the arc length of the outer surface of the aluminum alloy tube 100. In this embodiment, an opening is arranged every 20cm along the longitudinal direction of the bridge; the diameter of the connecting hole 122 is 4cm to 6cm. The GFRP connecting bar 310 is a GFRP threaded bar with a diameter of 22mm to 28mm. Before jacking up and pouring the UHPC inside the aluminum alloy tube 100, the bottom formwork and side formwork for pouring the UHPC concrete of the connecting seat 320 of the solid web section 120 are installed, and measures are taken to prevent grout leakage from the formwork. The aluminum alloy tube 100 is jacked up and the UHPC is poured until the designed portion of the solid web section 120 UHPC is completely filled. After the UHPC of the connecting seat 320 reaches a strength of 30MPa, the interface between it and the ordinary concrete of the bridge deck 400 should be roughened in time to make its roughness reach 3mm~8mm; before pouring the ordinary concrete of the bridge deck 400, the UHPC interface of the connecting seat 320 should be fully moistened and no standing water should be left.
[0049] Please see Figure 2 and Figure 3 In one embodiment, this application also describes an aluminum alloy tube UHPC arch bridge 10, which is constructed using the construction method of the aluminum alloy tube UHPC arch bridge 10 in any of the above embodiments. Specifically, the aluminum alloy tube UHPC arch bridge 10 includes two abutments 20, an arch rib, a bridge deck 400, and an arch seat 200, with the two abutments 20 spaced apart; the arch rib includes an aluminum alloy tube 100 and UHPC concrete poured into the aluminum alloy tube 100; the aluminum alloy tube 100 includes two arch feet 110, two hollow sections 130, and a solid section 120, with the solid section 120 located between the two hollow sections 130, and the two arch feet 110 located at the ends of the two hollow sections 130 away from the solid section 120; the bridge deck 400 is mounted on the arch rib and connected to the solid section 120 via a connecting component 300; and the arch seat 200 is formed on the abutments 20 by pouring UHPC concrete, with the arch feet 110 fixed within the arch seat 200 via an anchoring component.
[0050] Aluminum alloy tubes possess lightweight, high strength, and high toughness, while the internally injected UHPC boasts ultra-high compressive strength, high bonding strength, and low shrinkage. The combined structure exhibits superior load-bearing capacity, structural stiffness, and deformation resistance compared to traditional reinforced concrete arch ribs and ordinary steel-concrete composite arch ribs. The arch rib employs a segmented design consisting of arch foot, hollow section, and solid section. The solid section ensures the core load-bearing stiffness of the main span, while the hollow section significantly reduces the structure's self-weight, ensuring sufficient space for water passage. This design retains the material-saving and stress-bearing advantages of hollow arch bridges while avoiding the insufficient stiffness of traditional hollow arches.
[0051] See also 4 to 4 Figure 6 Specifically, the anchoring assembly includes GFRP bars 160. Multiple spaced anchoring holes 112 are provided on the outer wall of the arch foot 110, with a GFRP bar 160 inserted into each hole 112. One end of the GFRP bar 160 is anchored within the UHPC concrete inside the aluminum alloy tube 100, and the other end is anchored within the arch seat 200. The multiple anchoring holes 112 are spaced apart around the axis of the aluminum alloy tube 100. Further, a circular anchor plate 150 is provided at the end of the arch foot 110. The GFRP bars 160 pass through the anchoring holes 112 of the arch foot 110, with one end anchored to the UHPC inside the aluminum alloy tube 100 and the other end anchored to the UHPC arch seat 110, forming a bidirectional bonded anchoring. Combined with the end constraint of the circular anchor plate 150 at the end of the arch foot 110, a composite anchoring system is constructed to prevent pull-out, slippage, and stress concentration of the arch foot 110.
[0052] In one embodiment, a connecting steel cage 140 is inserted into the aluminum alloy tube 100, such that one end of the connecting steel cage 140 is located inside the aluminum alloy tube 100 and anchored in the UHPC concrete within the aluminum alloy tube 100, while the other end extends out of the end of the aluminum alloy tube 100 and is anchored inside the arch seat 200. Specifically, the connecting steel cage 140 includes multiple axial steel bars 142 and multiple GFRP stirrups 144. The multiple GFRP stirrups 144 are spaced apart along the axial direction of the aluminum alloy tube 100, and the multiple axial steel bars 142 are spaced apart along the circumferential direction of the aluminum alloy tube 100. One end of the connecting steel cage 140 is embedded in the UHPC within the aluminum alloy tube 100, and the other end extends into the arch seat 200, rigidly connecting the arch rib and the arch seat 200 as a whole, avoiding traditional single-point anchoring.
[0053] Please see Figure 2 and Figure 7 and Figure 9In one embodiment, the aluminum alloy tube 100 at the solid web section 120 has a plurality of spaced connection holes 122 on the outer wall facing the bridge deck 400. The connection assembly 300 includes GFRP connecting bars 310 and connecting seats 320. Each connection hole 122 is provided with a GFRP connecting bar 310. The connecting seat 320 is formed by pouring UHPC concrete. The connecting seat 320 is located between the bridge deck 400 and the solid web section 120 and connects the bridge deck 400 and the solid web section 120. One end of the GFRP connecting bar 310 is anchored in the UHPC concrete inside the aluminum alloy tube 100, and the other end is anchored in the connecting seat 320. The GFRP connecting bar 310 passes through the connecting hole 122 of the solid web section 120 aluminum alloy tube 100, with one end anchored to the UHPC inside the aluminum alloy tube 100 and the other end anchored to the UHPC connecting seat 320, forming a through-type load-bearing tie, which evenly and directly transfers the load of the bridge deck 400 to the solid web section 120 of the arch rib with the greatest stiffness, avoiding local stress concentration.
[0054] In this embodiment, each cross-section of the aluminum alloy tube 100 at the solid section 120 is provided with 5 connecting holes 122, one of which is located at the top and two on each side; along the length of the aluminum alloy tube 100, the distance between two adjacent connecting holes 122 is greater than or equal to 12cm, the diameter of the connecting hole 122 is 4cm to 8cm, and the diameter of the GFRP connecting rib 310 is 22mm to 28mm.
[0055] like Figure 3 and Figure 4 As shown, in this embodiment, there are at least two aluminum alloy tubes 100, which are spaced apart along the width of the bridge. Each aluminum alloy tube 100 has a connecting hole 122, and a GFRP connecting rib 310 is provided in each connecting hole 122. The GFRP connecting ribs 310 on different aluminum alloy tubes 100 are inserted into the same connecting seat 320. Specifically, different aluminum alloy tubes 100 can be constructed simultaneously. When different aluminum alloy tubes 100 are jacked up and injected with UHPC concrete, the pouring space is simultaneously filled with UHPC concrete to form the connecting seat 320.
[0056] like Figure 2 As shown, in this embodiment, the bridge abutment 20 is formed by casting C30 concrete, and the bridge deck 400 is formed by casting C40 concrete.
[0057] In this embodiment, the aluminum alloy tube UHPC arch bridge 10 also includes bridge abutment plates 500. There are two bridge abutment plates 500, which are located at both ends of the bridge deck 400 and are connected to the bridge deck 400 by connecting steel bars.
[0058] In this embodiment, the aluminum alloy tube UHPC arch bridge 10 also includes a retaining wall 600, which is disposed on the arch seat 200, and the end of the retaining wall 600 away from the arch seat 200 is supported on the bridge deck 400. There are two retaining walls 600, which are disposed on two arch seats 200 respectively.
[0059] The following description uses an aluminum alloy tube UHPC arch bridge 10 as an example from one embodiment: The aluminum alloy tube UHPC arch bridge 10 of this application has a carriageway width of 12m and sidewalk widths of 4.0m on each side. The calculated envelope values of the internal forces at key sections of each component of the aluminum alloy tube UHPC arch bridge 10 are shown in Tables 1 and 2.
[0060] Table 1. Upper limit of cross-sectional stress-envelope (Max) for the basic combination of 10 main components of the aluminum alloy tube UHPC arch bridge. Table 2. Lower limit of cross-sectional stress-envelope (Min) for the basic combination of 10 main components of the UHPC aluminum alloy tube arch bridge. (1) Calculate the minimum area of the axial reinforcement 142 connecting the steel cage 140: The axial reinforcement 142 of the connecting steel cage 140 of the arch abutment 200 is selected from HRB335 steel bars with a diameter of 22mm, and its tensile strength design value is... The pressure is 300 MPa. The radius of the UHPC inside the 100mm aluminum alloy tube is 17.6cm. (Based on the formula...) From the data in Table 1, we can obtain: , The minimum area of the axial reinforcement 142 connecting the steel cage 140: The area of a single axially oriented steel bar with a diameter of 22mm and a diameter of 142 is 3.801. Therefore, the minimum number of connecting steel cages 140 and axial steel bars 142 required for a single aluminum alloy tube 100 arch seat 200 is [number missing]. In this embodiment, 8 roots are used.
[0061] (2) Calculate the minimum width of the 150mm annular anchor plate: Based on the data recorded in Tables 1 and 2, , Design compressive strength of UHPC Design value of tensile strength of UHPC The wall thickness of the 100mm aluminum alloy tube If the width is 14mm, then the minimum width of the 150mm circular anchor plate is... ;like ,but This satisfies the force distribution requirements of the 200-meter joint section of the arch seat.
[0062] (3) Calculation of the number of rows of anchor holes 112 opened on the outer wall of the arch foot 110 of the aluminum alloy tube 100: in, Take 1.3, the number of anchor holes per row is 112. Take 8, , The diameter of the 100mm aluminum alloy tube The wall thickness of the aluminum alloy tube is 38mm, and the diameter is 100mm. The required shear bearing capacity for a single row of 100mm aluminum alloy tubes is 14mm. kN; Design value of bearing capacity of 100 aluminum alloy tube with 112 single anchor hole and 160 inner GFRP reinforcement. Therefore, the number of rows of anchor holes 112 arranged along the axis of the aluminum alloy tube 100 at the arch seat 200 is as follows. In this embodiment, Take 2.
[0063] (5) Segmentation positions of the 100mm arch rib of the aluminum alloy tube: The maximum normal stress of the aluminum alloy tube 100 does not exceed 50 MPa in the solid web section 120, but reaches 91.3 MPa in the hollow web section 130. Considering the strength reduction of the heat-affected zone of the weld and the fact that the conventional manufacturing capacity of the aluminum alloy tube 100 does not exceed 9m in length, the arch rib of the aluminum alloy tube 100 in this embodiment can be composed of 2 or 3 sections. The section position, i.e., the welded joint position, should be located within the solid web section 120 and at a distance of not less than 40cm from the junction of the solid web section 120 and the hollow web section 130.
[0064] The aforementioned aluminum alloy tube UHPC arch bridge 10 and its construction method utilize an aluminum alloy tube 100 outer shell and an internally poured UHPC composite structure for the arch rib. The arch rib is divided into an arch foot 110, a hollow section 130, and a solid section 120 in the middle. The solid section 120 serves as the main load-bearing area of the bridge deck 400. Reliable consolidation between the bridge deck 400 and the arch rib is achieved through connecting seats 320 and GFRP connecting bars 310, enhancing the overall local stiffness and shear bearing capacity. The end arch foot 110 is adapted for anchorage connection with the arch seat 200, centrally transmitting the overall axial force, shear force, and horizontal thrust of the arch rib. The arch seat 200 is integrally cast-in-place with UHPC concrete, and the high-strength UHPC matrix serves as the anchorage component, providing a strong grip and interlocking foundation for the arch foot 110, improving the joint connection strength and durability.
[0065] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0066] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0067] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A construction method for an aluminum alloy tube UHPC arch bridge, characterized in that, The construction method includes: Step S1: Aluminum alloy tubes are installed on two spaced bridge platforms to form aluminum alloy arch ribs, and the arch feet at both ends of the aluminum alloy tubes are placed on the bridge platforms. Step S2: After installing the anchoring components on the arch foot, pour UHPC concrete on the bridge abutment for the first time to form the first part of the arch seat, so that the first part of the arch seat covers part of the anchoring components. Step S3: Install connecting components on the solid section of the aluminum alloy tube, wherein the aluminum alloy tube includes a solid section in the middle, hollow sections on both sides of the solid section, and arched feet at both ends of the aluminum alloy tube. Step S4: Pump and inject UHPC concrete into the aluminum alloy tube to form the UHPC arch rib of the aluminum alloy tube; Step S5: Cast the bridge deck onto the connecting assembly so that the bridge deck is connected to the solid web section of the aluminum alloy tube through the connecting assembly; Step S6: Pour UHPC concrete a second time on the bridge abutment to form the second part of the arch seat. The second part is located above the first part so that the arch seat completely covers the anchoring components and the arch foot.
2. The construction method according to claim 1, characterized in that, Step S2: Install anchoring components on the arch foot, including: A connecting steel cage is inserted inside the aluminum alloy tube, so that one end of the connecting steel cage is inserted inside the aluminum alloy tube and the other end is located outside the arch foot of the aluminum alloy tube. Weld a circular anchor plate to the end of the aluminum alloy tube; Multiple spaced anchoring holes are provided on the outer wall of the arch foot of the aluminum alloy tube, and GFRP bars are inserted into each anchoring hole to form an anchoring assembly. Apply a layer of epoxy mortar to the outer wall of the arch foot, and pour UHPC concrete to form the arch base during the curing period of the epoxy mortar.
3. The construction method according to claim 2, characterized in that, The upper end of the axial reinforcing bar of the connecting steel cage extends into the aluminum alloy tube and is grouted with UHPC concrete. The length of the UHPC arch rib formed by the pressure grouting of the aluminum alloy tube is not less than 8 times the diameter of the axial reinforcing bar. The lower end of the axial reinforcing bar of the connecting steel cage extends out of the end face of the aluminum alloy tube for a length not less than 8 times the diameter of the axial reinforcing bar. The pressure grouting of UHPC concrete in the aluminum alloy tube is carried out after the strength of the first pouring of UHPC concrete reaches more than 30MPa.
4. The construction method according to claim 2, characterized in that, The inner diameter of the circular anchor plate is the same as the diameter at 1 / 2 wall thickness of the aluminum alloy tube, and the thickness of the circular anchor plate is 0.5 to 1.2 times the width extending out of the aluminum alloy tube. The minimum width of the circular anchor plate is In the formula: The absolute value of the most unfavorable compressive stress in the basic combination of aluminum alloy tubes at the arch foot section; The absolute value of the most unfavorable tensile stress in the basic combination of aluminum alloy tubes at the arch foot section; This represents the design value for the compressive strength of UHPC; This represents the design value for the tensile strength of UHPC. The wall thickness of the aluminum alloy tube; The ratio of the axial force of the aluminum alloy tube transmitted to the circular anchor plate is generally 0.5~0.
8.
5. The construction method according to claim 4, characterized in that, Multiple spaced anchoring holes are provided on the outer wall of the arch foot of the aluminum alloy tube, including: Multiple spaced anchor holes are made on the outer wall of the arch foot of the aluminum alloy tube, evenly distributed along the circumference, with a total of n holes, and arranged along the axis of the aluminum alloy tube according to the force transmission requirements. Row, , The design value of shear bearing capacity of UHPC and its GFRP reinforcement in a single anchorage hole of aluminum alloy tube; The shear bearing capacity required for UHPC and GFRP reinforcement within a single row of anchor holes in an aluminum alloy tube. In the formula: The ratio of the GFRP reinforcement in the anchoring hole of the aluminum alloy tube to transmit the axial force of the aluminum alloy tube can generally be taken as 0.6~1.
2. This refers to the diameter of the aluminum alloy tube.
6. The construction method according to any one of claims 1-5, characterized in that, Step S3 includes: opening multiple spaced connection holes on the outer wall of the solid section of the aluminum alloy tube facing the bridge deck, and inserting GFRP connecting bars into each connection hole; installing templates on the solid section to form a casting space. Step S4 includes: jacking up and injecting UHPC concrete into the aluminum alloy tube until the pouring space on the solid section is filled with UHPC concrete to form a connecting seat, and filling the aluminum alloy tube with UHPC concrete to form the aluminum alloy tube UHPC arch rib. Step S5 includes: once the strength of the connecting seat reaches 30MPa or more, roughening the part connecting to the bridge deck concrete, and pouring the construction bridge deck on the connecting component so that the bridge deck is connected to the solid section of the aluminum alloy pipe through the connecting component.
7. An aluminum alloy tube UHPC arch bridge, constructed using the construction method for aluminum alloy tube UHPC arch bridges according to any one of claims 1-6, characterized in that, The aluminum alloy tube UHPC arch bridge includes: Two bridge abutments, spaced apart; The arch rib includes an aluminum alloy tube and UHPC concrete poured inside the aluminum alloy tube; and the aluminum alloy tube includes two arch feet, two hollow sections and a solid section, the solid section being located between the two hollow sections, and the two arch feet being located at the ends of the two hollow sections away from the solid sections. Bridge deck, the bridge deck being disposed on the arch rib and connected to the solid web section via a connecting assembly; and An arch seat is formed on the bridge abutment by pouring UHPC concrete, and the arch foot is fixed in the arch seat by anchoring components.
8. The aluminum alloy tube UHPC arch bridge according to claim 7, characterized in that, The anchoring assembly includes GFRP bars. Multiple spaced anchoring holes are provided on the outer wall of the arch foot. A GFRP bar is inserted into each anchoring hole so that one end of the GFRP bar is anchored in the UHPC concrete inside the aluminum alloy tube, and the other end is anchored in the arch seat. The multiple anchoring holes are spaced around the axis of the aluminum alloy tube. A circular anchoring plate is provided at the end of the arch foot. A connecting steel cage is inserted inside the aluminum alloy tube, such that one end of the connecting steel cage is located inside the aluminum alloy tube and anchored in the UHPC concrete inside the aluminum alloy tube, while the other end extends out of the end of the aluminum alloy tube and is anchored inside the arch seat.
9. The aluminum alloy tube UHPC arch bridge according to claim 7 or 8, characterized in that, The aluminum alloy tube at the solid web section has multiple spaced connection holes on the outer wall of the bridge deck. The connection assembly includes GFRP connecting bars and connecting seats. Each connection hole is provided with a GFRP connecting bar. The connecting seat is formed by pouring UHPC concrete. The connecting seat is located between the bridge deck and the solid web section and connects the bridge deck and the solid web section. One end of the GFRP connecting bar is anchored in the UHPC concrete inside the aluminum alloy tube, and the other end is anchored in the connecting seat.
10. The aluminum alloy tube UHPC arch bridge according to claim 9, characterized in that, Five connection holes are provided on each cross section of the aluminum alloy tube in the solid section, one of which is located at the top and two on each side; along the length of the aluminum alloy tube, the distance between two adjacent connection holes is greater than or equal to 12cm, the diameter of the connection holes is 4cm to 8cm, and the diameter of the GFRP connecting rib is 22mm to 28mm.