Support area and construction method of steel truss concrete composite beam bridge

Abstract

This invention relates to the field of bridge structural engineering technology, and discloses the bearing area and construction method of a steel truss concrete composite beam bridge. The steel truss includes a top chord, bottom chord, side web members, middle web members, connecting beams, and node plates. The bridge deck includes a CA-RPC cast-in-place layer, a two-way steel mesh, embedded corrugated pipes, and prestressed tendons, and is connected to the top chord via shear connectors. A reinforced concrete block includes reinforced concrete, longitudinal reinforcement, and circumferential stirrups, and is connected to the web members via shear connectors. The sidewalls of the reinforced concrete block are equipped with buffer components. A protective component is also included. This invention has the advantages of high stability, high load-bearing capacity, high crack resistance of the bridge deck, and convenient construction. It solves the problem of pressure on the side plates of the steel truss during current transportation, avoiding damage to corner connections that easily lead to oxidation and corrosion, and improving the transportation convenience of the steel truss.

Description

Technical Field

[0001] This invention relates to the field of bridge structural engineering technology, specifically to the bearing area and construction method of a steel truss concrete composite beam bridge. Background Technology

[0002] With the rapid advancement of urbanization in my country, the construction of transportation infrastructure is also developing towards high performance, high durability, high economy, and high construction efficiency. Steel truss concrete composite beam bridges are a structural form that fully utilizes the properties of steel and concrete materials, offering advantages such as large spans and light weight. However, they also suffer from the common problem of bridge deck cracking in the negative bending moment zone, affecting the bridge's normal use and durability. Furthermore, the web members in the support zone of steel truss concrete composite beam bridges bear significant axial forces, and their compressive instability limits the structure's load-bearing capacity. Summary of the Invention

[0003] The purpose of this invention is to provide a bearing area and construction method for a steel truss concrete composite beam bridge to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The bearing area and construction methods of steel truss concrete composite beam bridges include:

[0006] A steel truss, comprising a top chord, a bottom chord, side web members, middle web members, connecting beams, and node plates;

[0007] The bridge deck includes a CA-RPC cast-in-place layer, a two-way steel mesh, an embedded corrugated pipe, and prestressed tendons. The bridge deck is connected to the upper chord via an upper chord shear connector.

[0008] A reinforced concrete block, comprising reinforced concrete, longitudinal steel bars and circumferential stirrups, wherein the reinforced concrete block is connected to the central web member via a central web member shear connector, and the sidewall of the reinforced concrete block is provided with a buffer assembly.

[0009] The protective assembly is wrapped around the corners of the lower chord and the side web members, and the corners of the two connected side web members. The protective assembly includes a base plate, with several fixing strips fixedly connected to the upper end of the base plate. Hinges are fixedly installed on both sides of the lower end of the base plate. Side plates are rotatably connected to both sides of the base plate via the hinges. Slide rails are fixedly connected to the upper ends of the two side plates. Fastening screws are fixedly installed on the outer ends of the side plates, and the fastening screws penetrate the side plates and are fixedly connected to the end faces of the fixing strips.

[0010] Optionally, the upper chord includes an upper chord top plate, an upper chord web, an upper chord bottom plate, an upper chord stiffening rib, and an upper chord shear connector; the side web includes a side web top plate, a side web web, a side web bottom plate, and a side web stiffening rib; the middle web includes a middle web top plate, a middle web web, a middle web bottom plate, a middle web stiffening rib, and a middle web shear connector; and the lower chord includes a lower chord top plate, a lower chord web, a lower chord bottom plate, a lower chord stiffening rib, and lower chord filler concrete.

[0011] Optionally, the bridge deck is provided with a two-way steel mesh, an embedded corrugated pipe, and prestressing tendons, wherein the extension direction of the embedded corrugated pipe and the prestressing tendons is the same as the extension direction of the upper chord.

[0012] Optionally, the reinforced concrete block is provided with longitudinal steel bars and circumferential stirrups, and the longitudinal steel bars overlap with the steel bars at the top of the pier.

[0013] Optionally, the side plate has several connecting holes and slots, the bottom plate of the protective component has a corrosion-resistant material layer on the upper layer, an anti-oxidation material layer on the lower end of the corrosion-resistant material layer, a sealing layer on the lower end of the anti-oxidation material layer, and a polymer steel substrate on the lower end of the sealing layer.

[0014] Optionally, the base plate of the protective component has several heat dissipation vents.

[0015] Optionally, the corrosion-resistant material layer is a fiberglass composite fiber layer;

[0016] The antioxidant material layer is made of octadecyl propionate.

[0017] The sealing layer is a high-pressure asbestos rubber layer.

[0018] Optionally, the buffer assembly includes a fixed plate, a first spring, a first buffer rod, a second buffer rod, a second spring, and a buffer rod connecting plate. One end of the first spring is fixedly connected to the inner wall of the fixed plate, one end of the first buffer rod is fixedly connected to the other end of the first spring, the side wall of the second buffer rod is slidably connected to the middle of the side wall of the fixed plate, and one end of the second spring is fixedly connected to the side wall of the second buffer rod.

[0019] Optionally, the side wall of the buffer rod connecting plate is fixedly connected to one end of the first buffer rod and the second buffer rod.

[0020] Optionally, the construction method for the bearing area of ​​a steel truss concrete composite beam bridge includes the following steps:

[0021] Fabrication and assembly of steel structure components; placement of temporary supports; hoisting and splicing of steel structure components to form a steel truss; pouring concrete to fill the lower chord of the steel truss.

[0022] Splice and connect beams; arrange longitudinal reinforcement bars to form lap joints with the anchor bars at the top of the piers, arrange circumferential stirrups, arrange formwork for reinforced concrete blocks, partially pour reinforced concrete blocks, and leave a certain gap between them and the upper chord.

[0023] Formwork is erected on the upper chord, and a two-way steel mesh and an embedded corrugated pipe are arranged. The CA-RPC cast-in-place layer is poured. The reinforced concrete block is poured. The prestressed tendons are inserted into the embedded corrugated pipe and tensioned.

[0024] The present invention has at least the following beneficial effects:

[0025] (1) This scheme uses a steel truss, including the upper chord, lower chord, side web members, middle web members, connecting beams and node plates;

[0026] The bridge deck includes a CA-RPC cast-in-place layer, a two-way steel mesh, embedded corrugated pipes, and prestressed tendons. The bridge deck is connected to the upper chord via shear connectors. The reinforced concrete block includes reinforced concrete, longitudinal steel bars, and circumferential stirrups. The reinforced concrete block is connected to the web members via shear connectors. This steel truss concrete composite beam bridge has advantages such as strong stability, high load-bearing capacity, strong crack resistance of the bridge deck, and convenient construction in the bearing area. Furthermore, the protective components are connected to side plates on both sides of the base plate via hinges. Fixing strips are then fixed to the upper end of the base plate, and fastening screws penetrate the side plates and are fixedly connected to the end faces of the fixing strips. This solves the problem of the side plates of the steel truss being squeezed during current transportation, avoids damage to the corner joints leading to easy oxidation and corrosion, and improves the transportation convenience of the steel truss.

[0027] (2) This solution utilizes the installed protective components to prevent the steel truss side plates from being squeezed, thus avoiding the side plates from bending outward or inward, which is beneficial for the subsequent use of the steel truss.

[0028] (3) This solution sets up a polymer steel substrate and an anti-oxidation material layer. When using steel trusses, the strength and durability of the steel trusses can be enhanced by the polymer steel substrate and the anti-oxidation material layer. It can also provide better protection and extend the service life.

[0029] (4) This solution sets up a buffer component and uses the buffer component to effectively buffer and protect the reinforced concrete block from being severely damaged due to the lack of a buffer structure, thereby improving the protection effect. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the cross-section of the bridge deck of the present invention;

[0033] Figure 3 This is a schematic diagram of the longitudinal section of the reinforced concrete block according to the present invention;

[0034] Figure 4 This is a schematic diagram of the cross-section of the rod in this invention;

[0035] Figure 5 This is a schematic diagram of the node board of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the buffer component of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the protective component of the present invention;

[0038] Figure 8 This is a schematic diagram of the end face of the protective component of the present invention.

[0039] Figure 9 This is a schematic diagram of the structure of the base plate of the present invention.

[0040] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0041] 1. CA-RPC cast-in-place layer; 101. Two-way steel mesh; 102. Embedded corrugated pipe; 103. Prestressed tendons; 2. Reinforced concrete block; 201. Reinforced concrete; 202. Longitudinal reinforcement; 203. Circumferential stirrups; 3. Top chord; 301. Top chord top plate; 302. Top chord web; 303. Top chord bottom plate; 304. Top chord stiffening ribs; 305. Top chord shear connection 4. Side Web Member; 401. Side Web Member Top Plate; 402. Side Web Member Web Plate; 403. Side Web Member Bottom Plate; 404. Side Web Member Stiffening Rib; 5. Middle Web Member; 501. Middle Web Member Top Plate; 502. Middle Web Member Web Plate; 503. Middle Web Member Bottom Plate; 504. Middle Web Member Stiffening Rib; 505. Middle Web Member Shear Connector; 6. Lower Chord Member; 601. Lower Chord Member Top Plate; 602. Lower Chord Member Web Plate 603. Bottom plate of lower chord; 604. Stiffening rib of lower chord; 605. Concrete filling of lower chord; 7. Connecting beam; 701. End plate of connecting beam; 702. End plate connecting plate; 703. Bolt; 8. Node plate; 9. Buffer assembly; 94. Fixing plate; 95. First spring; 96. First buffer rod; 97. Second buffer rod; 98. Second spring; 99. Buffer rod connecting plate; 910. Protective plate; 911. Reflective strip; 10. Protective assembly; 1001. Bottom plate of protective assembly; 1002. Fixing strip; 1003. Hinge; 104. Side plate; 105. Slide rail plate; 106. Fastening screw; 107. Connecting hole groove; 108. Heat dissipation vent; 109. Corrosion-resistant material layer; 1010. Antioxidant material layer; 1011. Sealing layer; 1012. Polymer steel substrate. Detailed Implementation

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Please see Figures 1-9 This invention provides a bearing area and construction method for a steel truss concrete composite beam bridge, including a steel truss, a bridge deck, and reinforced concrete blocks. The steel truss includes an upper chord 3, side web members 4, middle web members 5, a lower chord 6, a connecting beam 7, and a node plate 8. The bridge deck includes a CA-RPC cast-in-place layer 1, a two-way steel mesh 101, an embedded corrugated pipe 102, and prestressed tendons 103. The CA-RPC cast-in-place layer 1 is connected to the upper chord 3 via an upper chord shear connector 305. The reinforced concrete block 2 includes reinforced concrete 201, longitudinal steel bars 202, and circumferential stirrups 203. The reinforced concrete block 2 is connected to the middle web member 5 via a middle web shear connector 505. The sidewall of the reinforced concrete block 2 is provided with a buffer assembly 9.

[0044] The protective component 10 is wrapped around the corner of the lower chord 6 and the side web 4 and the corner of the two connected side web 4. The protective component includes a protective component base plate 1001. Several fixing strips 1002 are fixedly connected to the upper end of the protective component base plate 1001. Hinges 1003 are fixedly installed on both sides of the lower end of the protective component base plate 1001. Side plates 104 are rotatably connected to both sides of the protective component base plate 1001 through the hinges 1003. Slide rail plates 105 are fixedly connected to the upper end of the two side plates 104. Fastening screws 106 are fixedly installed on the outer end of the side plates 104, and the fastening screws 106 penetrate the side plates 104 and are fixedly connected to the end face of the fixing strips 1002.

[0045] The side plate 104 is rotated by hinge 1003, and then the side plate 104 is snapped onto the side wall of the side brace 4 to achieve a state parallel to the base plate 1001. This prevents the side plate 104 from bending outward or inward during transportation, which would be detrimental to subsequent use. When in use, the side plate 104 can be rotated and then fixed to both sides of the base plate 1001 of the protective assembly using fastening screws 106. The fastening screws 106 penetrate the side plate 104 and are fixed to the end face of the fixing strip 1002. The number of fixing strips 1002 is not limited and can be increased or decreased according to the rationality of use. The corrosion-resistant material layer 109 improves the corrosion resistance of the cable tray, the oxidation-resistant material layer 1010 improves the oxidation resistance of the cable tray, the sealing layer 1011 improves the sealing of the cable tray for cable storage, and the high-polymer steel substrate 1012 improves the overall strength and can also better protect the cables and extend their service life.

[0046] The CA-RPC cast-in-place layer boasts strong load-bearing capacity, simplifies the structural form, reduces the amount of steel structure materials used, and thus lowers construction costs. Simultaneously, the use of thinner slabs reduces self-weight and the amount of formwork and support work required. Furthermore, its application in negative bending moment zones effectively reduces bridge deck cracking. The reinforcement concrete blocks distribute the axial force of the compression web members, enhancing the structure's stability and load-bearing capacity.

[0047] The steel-concrete composite beam bridge according to the present invention has the advantages of strong stability, strong load-bearing capacity, strong crack resistance of bridge deck, and relatively convenient construction.

[0048] In some embodiments, the upper chord 3 includes a top plate 301, a web plate 302, a bottom plate 303, and a stiffening rib 304 connected in sequence, and a shear connector 305 is welded to the top plate 301. The side web 4 includes a top plate 401, a web plate 402, a bottom plate 403, and a stiffening rib 404 connected in sequence. The middle web 5 includes a top plate 501, a web plate 502, a bottom plate 503, and a stiffening rib 504 connected in sequence, and a shear connector 505 is welded to the top plate 501, web plate 502, and bottom plate 503.

[0049] Specifically, the top plate 301 of the upper chord is connected to the CA-RPC cast-in-place layer 1 through the upper chord shear connector 305; the top plate 501, web plate 502, and bottom plate 503 of the middle web members are connected to the reinforced concrete block 2 through the middle web shear connector 505; the upper chord 3 and the side web members 4 are welded together, the upper chord 3 and the middle web members 5 are welded together, the side web members 4 and the middle web members 5 are welded together, the side web members 4 and the side web members 4 are welded together, the middle web members 5 and the middle web members 5 are welded together, the lower chord 6 and the side web members 4 are welded together, the lower chord 6 and the middle web members 5 are welded together, and the upper chord 3, the side web members 4, the middle web members 5, and the lower chord 6 are welded together to the node plate 8.

[0050] In some embodiments, the connecting beam 7 is welded to the lower chord 6 via the connecting beam end plate 701, the connecting beam end plate 701 and the end plate connecting plate 702 are welded together, the end plate connecting plate 702 and the top plate and bottom plate of the connecting beam are connected by bolts 703, and the top plate, web plate and bottom plate of the connecting beam are welded together in sequence.

[0051] The construction method for a steel-concrete composite beam bridge according to an embodiment of the present invention includes the following steps:

[0052] Fabrication and assembly of steel structure components, including the top chord 3, side web members 4, middle web members 5, and bottom chord 6;

[0053] Temporary supports were installed, steel structural components were hoisted, and the upper chord 3, side web members 4, middle web members 5, lower chord 6, and node plate 8 were welded and spliced.

[0054] Pour concrete 605 into the lower chord 6; splice and connect beam 7.

[0055] Longitudinal reinforcement 202 is arranged to lap with the anchor bars at the top of the pier, and circumferential stirrups 203 are arranged.

[0056] Set up the formwork for the reinforced concrete block, partially pour the reinforced concrete 201, and leave a certain gap between it and the upper chord 3;

[0057] Support the formwork on the upper chord 3 and arrange the two-way steel mesh 101 and the embedded corrugated pipe 102, and pour the CA-RPC cast-in-place layer 1.

[0058] Complete the pouring of reinforcement concrete 201;

[0059] The prestressed tendons 103 are inserted into the embedded corrugated pipe 102 and tensioned.

[0060] The base plate 1001 has several heat dissipation vents 108. The corrosion-resistant material layer 109 is a fiberglass composite fiber layer. The antioxidant material layer 1010 is made of octadecyl propionate. The sealing layer 1011 is a high-pressure asbestos rubber layer. The base plate 1001 has several heat dissipation vents 108, which can dissipate heat generated inside the cable tray in a timely manner, reducing the cable temperature and improving cable efficiency. The corrosion-resistant material layer 109, being a fiberglass composite fiber layer, has good corrosion resistance, preventing the cable tray from being corroded and damaged. The antioxidant material layer 1010, made of octadecyl propionate, has good antioxidant properties, preventing the cable from being oxidized and weathered. The sealing layer 1011, being a high-pressure asbestos rubber layer, has excellent sealing properties, isolating some external factors that may affect the cable tray.

[0061] The buffer assembly includes a fixed plate 94, a first spring 95, a first buffer rod 96, a second buffer rod 97, a second spring 98, and a buffer rod connecting plate 99. One end of the first spring 95 is fixedly connected to the inner wall of the fixed plate 94, and one end of the first buffer rod 96 is fixedly connected to the other end of the first spring 95. The side wall of the second buffer rod 97 is slidably connected to the middle of the side wall of the fixed plate 94, and one end of the second spring 98 is fixedly connected to the side wall of the second buffer rod 97. The side wall of the buffer rod connecting plate 99 is fixedly connected to one end of the first buffer rod 96 and the second buffer rod 97. The first buffer rod 96 and the second buffer rod 97 are moved and buffered by the sliding motion driven by the protective plate 910. At the same time, the reaction force of the first spring 95 and the reaction force of the second spring 98 provide secondary buffering of the impact force, thereby reducing the impact force.

[0062] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. The bearing area of ​​a steel truss concrete composite beam bridge, characterized in that, include: A steel truss, comprising a top chord, a bottom chord, side web members, middle web members, connecting beams, and node plates; The upper chord includes an upper chord top plate, an upper chord web, an upper chord bottom plate, an upper chord stiffening rib, and an upper chord shear connector; the side web includes a side web top plate, a side web web, a side web bottom plate, and a side web stiffening rib; the middle web includes a middle web top plate, a middle web web, a middle web bottom plate, a middle web stiffening rib, and a middle web shear connector; the lower chord includes a lower chord top plate, a lower chord web, a lower chord bottom plate, a lower chord stiffening rib, and lower chord filler concrete. The steel truss also includes connecting beam end plates, end plate connecting plates, connecting beam top plates, connecting beam bottom plates, and connecting beam webs; the connecting beams are welded to the lower chords via connecting beam end plates, the connecting beam end plates and end plate connecting plates are welded together, the end plate connecting plates and connecting beam top plates and connecting beam bottom plates are bolted together, and the connecting beam top plates, connecting beam webs, and connecting beam bottom plates are welded together in sequence; The bridge deck includes a CA-RPC cast-in-place layer, a two-way steel mesh, an embedded corrugated pipe, and prestressed tendons. The bridge deck is connected to the upper chord via an upper chord shear connector. A reinforced concrete block, comprising reinforced concrete, longitudinal steel bars and circumferential stirrups, wherein the reinforced concrete block is connected to the central web member via a central web member shear connector, and the sidewall of the reinforced concrete block is provided with a buffer assembly. The protective assembly is wrapped around the corners of the lower chord and the side web members, and the corners of the two connected side web members. The protective assembly includes a base plate, with several fixing strips fixedly connected to the upper end of the base plate. Hinges are fixedly installed on both sides of the lower end of the base plate. Side plates are rotatably connected to both sides of the base plate via the hinges. Slide rails are fixedly connected to the upper ends of the two side plates. Fastening screws are fixedly installed on the outer ends of the side plates, and the fastening screws penetrate the side plates and are fixedly connected to the end faces of the fixing strips.

2. The bearing area of ​​the steel truss concrete composite beam bridge according to claim 1, characterized in that: The bridge deck is equipped with a two-way steel mesh, an embedded corrugated pipe, and prestressed tendons. The extension direction of the embedded corrugated pipe and the prestressed tendons is the same as the extension direction of the upper chord.

3. The bearing area of ​​the steel truss concrete composite beam bridge according to claim 1, characterized in that: The reinforced concrete block is equipped with longitudinal steel bars and circumferential stirrups, and the longitudinal steel bars overlap with the steel bars at the top of the pier.

4. The bearing area of ​​the steel truss concrete composite beam bridge according to claim 1, characterized in that: The side plate has several connection holes and slots. The bottom plate of the protective component has a corrosion-resistant material layer on the upper layer, an anti-oxidation material layer on the lower end of the corrosion-resistant material layer, a sealing layer on the lower end of the anti-oxidation material layer, and a polymer steel substrate on the lower end of the sealing layer.

5. The bearing area of ​​the steel truss concrete composite beam bridge according to claim 1, characterized in that: The base plate of the protective component has several heat dissipation vents.

6. The bearing area of ​​the steel truss concrete composite beam bridge according to claim 4, characterized in that: The corrosion-resistant material layer is a fiberglass composite fiber layer; The antioxidant material layer is made of octadecyl propionate. The sealing layer is a high-pressure asbestos rubber layer.

7. The bearing area of ​​the steel truss concrete composite beam bridge according to claim 1, characterized in that: The buffer assembly includes a fixed plate, a first spring, a first buffer rod, a second buffer rod, a second spring, and a buffer rod connecting plate. One end of the first spring is fixedly connected to the inner wall of the fixed plate, one end of the first buffer rod is fixedly connected to the other end of the first spring, the side wall of the second buffer rod is slidably connected to the middle of the side wall of the fixed plate, and one end of the second spring is fixedly connected to the side wall of the second buffer rod.

8. The bearing area of ​​the steel truss concrete composite beam bridge according to claim 7, characterized in that: The side wall of the buffer rod connecting plate is fixedly connected to one end of the first buffer rod and the second buffer rod.

9. The construction method for the bearing area of ​​a steel truss concrete composite beam bridge according to claim 3, characterized in that, Includes the following steps: Fabrication and assembly of steel structure components; placement of temporary supports; hoisting and splicing of steel structure components to form a steel truss; pouring concrete to fill the lower chord of the steel truss. Splice and connect beams; arrange longitudinal reinforcement bars to form lap joints with the anchor bars at the top of the piers, arrange circumferential stirrups, arrange formwork for reinforced concrete blocks, partially pour reinforced concrete blocks, and leave a certain gap between them and the upper chord. Formwork is erected on the upper chord, and a two-way steel mesh and an embedded corrugated pipe are arranged. The CA-RPC cast-in-place layer is poured. The reinforced concrete block is poured. The prestressed tendons are inserted into the embedded corrugated pipe and tensioned.

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