A steel structure back-anchored V pier for a three-limbed star-shaped pedestrian landscape bridge and its construction method

Abstract

This application discloses a rear-anchored V-pier steel structure for a three-limb star-shaped pedestrian landscape bridge and its construction method. The rear-anchored V-pier is applied to a main bridge arch having three arch limbs, the three arch limbs being connected in a three-limb star shape. The rear-anchored V-pier includes an upper-supported arch foot V-pier; the rear end of each arch limb is provided with an arch foot V-pier; the top of the arch foot V-pier is connected to the arch limb, and the bottom of the arch foot V-pier is hinged to a pedestal pile foundation pre-cast on the construction ground; a tie rod is connected between the rear end of the arch limb and the pedestal pile foundation, and the pedestal pile foundation is provided with an anchor cable tensioning structure for tensioning the tie rod. This application meets the installation requirements of long-span bridge arches on soft soil foundations and facilitates the installation of long-span bridge arches.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier and a construction method. Background Art

[0002] With the progress of the economy, today's bridges not only need to meet the function of traffic, but also take into account the aesthetics of the building; and steel trusses are widely used in bridge construction because of their strong spanning capacity and good landscape effect.

[0003] Traditional steel arch landscape bridge construction methods mostly adopt the beam-first-arch-later construction method. The beam-first-arch-later method means that the beams are installed section by section using temporary supports. After the beams are installed, the supports are installed on the bridge deck and the arch ribs are hoisted on the bridge deck by a car crane. This method has a low cost; however, it is subject to many restrictions on construction conditions. For example, the arrangement of the supports and the weight of the arch rib segments are restricted, and it cannot well meet the installation requirements of large-span bridge arches on soft soil foundations. Therefore, there is a defect that it is not convenient to install large-span bridge arches, and it is in urgent need of improvement. Summary of the Invention

[0004] In order to meet the installation requirements of large-span bridge arches on soft soil foundations and facilitate the installation of large-span bridge arches, the present application provides a three-limb star-shaped pedestrian landscape bridge steel structure rear-anchored V-pier and construction method.

[0005] This application provides a three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier and construction method, which adopts the following technical solutions:

[0006] A rear-anchor V-pier of a three-limb star-shaped pedestrian landscape bridge steel structure, wherein the rear-anchor V-pier is applied to a main bridge arch provided with three arch limbs, and the three arch limbs are connected in a three-limb star shape; the rear-anchor V-pier includes an upper-supported arch foot V-pier; the rear end of each arch limb is provided with the arch foot V-pier; the top of the arch foot V-pier is connected to the arch limb, and the bottom of the arch foot V-pier is hinged with a pedestal pile foundation for pre-casting on the construction ground; a pull rod is connected between the rear end of the arch limb and the pedestal pile foundation, and the pedestal pile foundation is provided with an anchor cable tensioning structure for tensioning the pull rod.

[0007] By adopting the above technical solution, the technical solution of this application takes a long-span bridge arch on a soft soil foundation on three banks of two river basins as an example. Since there are three river banks at the confluence of two rivers, in order to meet the traffic needs between the three adjacent river banks, a main bridge arch in the shape of a three-limb star can be set, so that the three arch limbs are respectively installed on the three river banks at the confluence of the two rivers. The three arch limbs of the main bridge arch form a three-limb star-shaped three-branch force-bearing structure;

[0008] During construction, the pedestal pile foundation is first cast at the construction pile foundation location on the river bank, the lower node of the arch foot V pier is hinged to the pedestal pile foundation, and the upper node of the arch foot V pier is rigidly connected to the arch limb; a number of temporary trestle bridges are set up at intervals along the extension direction of the three arch limbs in the river, and then the main structures of the three arch limbs are hoisted on the temporary trestle bridges (the construction work of the three arch limbs is carried out simultaneously) to connect the various steel segments of the main bridge arch steel structure into a whole; the temporary trestle bridges are dismantled, and then the arch foot V pier is tensioned at the rear end of the arch limb using the anchor cable tensioning structure (at this time the arch foot V pier and the pedestal pile foundation pile structure are hingedly connected), that is, the tension rod is tensioned, and the three-branch structure is tensioned simultaneously; the tension rod drives the rear end of the arch limb to rotate at the hinge of the arch foot V pier, so that the other end of the limb is arched, thereby facilitating the arch raising operation of the main bridge arch; after the tension rod is tensioned to the design value, the arch raising operation of the main bridge arch is completed;

[0009] After the arch is raised, the three arch limbs are rigidly connected, and the construction of the steel structure of the three-limb star-shaped pedestrian landscape bridge is completed; the main bridge arch of the technical solution of this application adopts an upper-supported arch foot V-pier hinged bridge structure, and by applying tensioning force to the rear ends of the three arch limbs of the main bridge arch, the arch foot V-pier of the main bridge arch rotates, releasing part of the axial force in the main bridge arch, converting part of the force of the bridge arch into the force of the bridge, reducing the horizontal thrust of the arch foot of the main bridge arch, thereby meeting the installation requirements of large-span bridge arches on soft soil foundations, and actively adjusting the balance state of the main bridge arch structure, which is conducive to improving the installation stability of the bridge construction; the three-limb star-shaped pedestrian landscape bridge achieves a beautiful bridge construction effect.

[0010] Preferably, a one-way hinge assembly is provided at the bottom of the arch foot V-pier; the one-way hinge assembly includes a first ear plate, a second ear plate and a pin shaft; the first ear plate is connected to the bottom of the arch foot V-pier, the second ear plate is connected to the pedestal pile foundation, the pin shaft passes through the first ear plate and the second ear plate in the horizontal direction, and the first ear plate and the second ear plate are hinged through the pin shaft.

[0011] By adopting the above technical solution, the first ear plate, the second ear plate and the pin shaft realize a one-way hinged structure along the horizontal direction as the axis; the arch foot V pier is vertically rotated with the pin shaft as the axis, and the arch foot V pier is hinged to the base pile foundation through the one-way hinge assembly at the bottom, so that the anchor cable tensioning structure can complete the arching effect of the three arch limbs through the tensioning rod.

[0012] Preferably, the one-way hinge components are arranged in multiple groups at intervals, the pull rods are arranged in multiple groups at intervals, and the anchor cable tensioning structure is arranged in multiple groups corresponding to the multiple pull rods.

[0013] By adopting the above technical solution, since the arch foot V-pier and the main bridge arch have a heavy deadweight, multiple tie rods and multiple sets of anchor cable tensioning structures are used to apply tensioning force during tensioning, which is conducive to completing the arch raising operation of the main bridge arch and is more convenient for on-site operation; multiple sets of one-way hinge assemblies are conducive to improving the hinged connection strength between the arch foot V-pier and the pedestal pile foundation.

[0014] Preferably, the arch foot V-pier is provided with a fixed hinge seat; the bottom side of the fixed hinge seat is connected to the anchor bolts pre-buried in the base pile foundation, and the top side of the fixed hinge seat is provided with a welded steel plate, and a gap is provided between the welded steel plate and the arch foot V-pier.

[0015] By adopting the above technical solution, the arch foot V-pier includes two forms: a lower hinged V-pier arch and a V-pier arch fixed after the bridge is completed; before the arch is raised, a gap is set between the welded steel plate and the arch foot V-pier to provide rotation space when the arch foot V-pier rotates. At this time, the arch foot V-pier is in the lower hinged V-pier arch form; after the arch raising operation of the main bridge arch is completed, the hinged arch foot V-pier needs to be fixed and rigidly connected to the base pile foundation. At this time, it is fixed by welding, pouring concrete and other rigid connection methods through the gap between the fixed hinge seat and the welded steel plate; thereby facilitating the conversion of the lower hinged V-pier arch form into a V-pier arch fixed after the bridge is completed, which is beneficial to the backfilling of the foundation pit of the arch foot V-pier structure after the bridge is completed, and enhances the installation stability of the entire pedestrian landscape bridge structure after the bridge is completed.

[0016] Preferably, the pull rod includes a prestressed steel bundle; the anchor cable tensioning structure includes an anchor jack and a matching steel pipe and a P anchor pre-buried in the foundation of the pedestal pile; the matching steel pipe is sleeved on the prestressed steel bundle; the anchor jack is installed at the tail end of the arch limb; the anchor jack is tensionedly connected to one end of the prestressed steel bundle, and the other end of the prestressed steel bundle passes through the anchor hole of the P anchor and is fixedly buried in the foundation of the pedestal pile.

[0017] By adopting the above technical solution, before the construction of the pedestal pile foundation, it is necessary to pre-position and embed the P anchor and the supporting steel pipe, so that one end of the prestressed steel bundle passes through the supporting steel pipe and the P anchor in sequence and is buried inside the pedestal pile foundation; the end of the prestressed steel bundle connected to the P anchor is buried inside the pedestal pile foundation to form a fixed end, and the end of the prestressed steel bundle connected to the anchor jack is tensioned to form a tensioned end. The anchor jack tensions the prestressed steel bundle in the pull rod so that the arch foot V pier drives the top arch limb to rotate vertically, thereby facilitating the arching effect of the main bridge arch, that is, the anchor cable tensioning structure applies extracorporeal prestressing by tensioning the main bridge arch construction, so that the arch limbs of the main bridge arch are deformed, thereby optimizing the horizontal thrust of the main bridge arch structure, presenting the arch effect of the main bridge arch, and improving the bearing capacity of the entire three-limb star-shaped pedestrian landscape bridge.

[0018] Preferably, the anchor cable tensioning structure includes an anchor steel mesh, an anchor spiral bar and a steel anchor beam; the anchor steel mesh is pre-buried and cast in the cap pile foundation, the bottom of the prestressed steel bundle passes through the anchor spiral bar and is connected to the anchor steel mesh and the P anchor in sequence; the steel anchor beam is rigidly connected to the arch limb; the top of the prestressed steel bundle is connected to the steel anchor beam.

[0019] By adopting the above technical solution, before the construction of the pedestal pile foundation, it is necessary to pre-position and bury the anchor steel mesh and the anchor spiral reinforcement; after the bottom end of the prestressed steel bundle is tied or welded to the anchor steel mesh, the rear end of the prestressed steel plastic is fixed by the anchor spiral reinforcement and the P anchor to form an anchor end, so that after the pedestal pile foundation is cast, the rear end of the prestressed steel bundle is buried and fixed inside the pedestal pile foundation, which is beneficial to enhance the connection and fixing effect of the prestressed steel bundle and the pedestal pile foundation; the top of the prestressed steel plastic is installed at the rear end of the arch limb through the steel anchor beam, and the top end of the prestressed steel bundle and the anchor jack form a tensioning end at the rear end of the arch limb, so that it is convenient to tension the tie rod step by step through the anchor jack to tension the tie rod prestress to the design value.

[0020] Preferably, the prestressed steel bundle is connected with a vacuum grouting pipe and a grouting pipe; the bottom end of the vacuum grouting pipe is buried in the pedestal pile foundation and is connected with the matching steel pipe, and the top end of the vacuum grouting pipe extends out of the top of the pedestal pile foundation; the top of the prestressed steel bundle is sleeved with the matching steel pipe; the grouting pipe passes through the steel anchor beam and is connected with the matching steel pipe; the prestressed steel bundle is sleeved with a metal bellows, and the opposite ends of the metal bellows are respectively detachably connected to the two matching steel pipes.

[0021] By adopting the above technical solution, the prestressed steel bundle forms an internal bundle-type tensioning structure through the matching steel pipes and metal bellows at both ends; so that after the prestressed steel bundle is tensioned, it can be fixed by grouting through the vacuum grouting pipe and the matching steel pipe, so that while meeting the early tensioning and arching operations, the entire prestressed steel bundle can be fixed on the base pile foundation after the arching is completed; the vacuum grouting pipe and the slurry outlet pipe facilitate the spraying and fixing of the prestressed steel bundle, and the operation is more convenient.

[0022] Preferably, the fixed hinge seat is connected to a pressure plate and a shear connector pre-buried in the pedestal pile foundation, the shear connector is installed on the side of the pressure plate away from the fixed hinge seat, and the pressure plate is also connected to a fixing member for fixing the pressure plate to the top of the pedestal pile foundation.

[0023] By adopting the above technical solution, the pressure plate is used to improve the shear strength of the pedestal pile foundation when the arch foot V pier rotates; the shear connector can withstand and transmit the longitudinal shear force between the steel beam and the concrete slab in the pedestal pile foundation, and can also be used to resist the lifting effect between the pressure plate and the steel beam; thereby, the shear connector improves the shear effect of the pressure plate and the pedestal pile foundation when the arch foot V pier rotates, which is beneficial to improving the installation strength of the pedestal pile foundation; the fixing parts improve the installation stability of the pressure plate on the pedestal pile foundation.

[0024] Preferably, the cap pile foundation includes a plurality of rock-embedded piles arranged at vertical intervals and a reinforced concrete cap cast on top of the plurality of rock-embedded piles, the plurality of rock-embedded piles forming a foundation pile group, and a concrete cushion layer is provided on the bottom side of the cap pile foundation.

[0025] By adopting the above technical solution, the foundation pile group and concrete cushion layer formed by multiple rock-embedded piles arranged at intervals are suitable for construction sites with relatively soft soil layers. The dispersed multiple rock-embedded piles improve the overall stiffness of the entire pile foundation.

[0026] A construction method for a rear-anchored V-pier of a three-limb star-shaped pedestrian landscape bridge steel structure comprises the following steps:

[0027] Temporary trestle bridges were erected along the extension direction of the three arch limbs of the main bridge arch, and foundation pits were excavated at the arch feet of the three arch limbs of the main bridge arch, and the pile foundations were cast.

[0028] V-piers are installed at the arch feet of the three arch limbs of the main bridge, forming a hinged structure between the bottom end of the arch foot V-pier and the pile foundation; the top end of the arch foot V-pier can complete vertical rotation; tie rods and anchor cable tensioning structures are installed at the rear end of the arch limbs to tension the tie rods;

[0029] The prefabricated main bridge arch segments were hoisted and spliced on the temporary trestle, so that the three arch limbs of the main bridge arch were connected to form a three-limb star-shaped pedestrian landscape bridge steel structure;

[0030] dismantling of temporary trestle bridges;

[0031] Start the anchor cable tensioning structure to tension the tie rod to the design value, and rotate the arch foot V pier relative to the pile foundation to complete the arch rigid connection of the three arch limbs;

[0032] Convert the arch foot V-pier into a fixed structure; reinforce the arch foot V-pier and the cap pile foundation piles with concrete encapsulation, and backfill the foundation pit.

[0033] By adopting the above technical solution, the arch foot V-pier can be rotated vertically so that after the main bridge arch is connected, the anchor cable tensioning structure is used to tension the rear end of the arch foot V-pier, so that the arch foot V-pier drives the arch foot position of the main bridge arch to arch upward, that is, the arch raising operation of the main bridge arch is completed; the present application performs the arch raising operation through the arch foot V-pier and the anchor cable tensioning structure, and reasonably arranges the construction steps of the installation structure of the main bridge arch, adopts the installation method conversion of the arch foot V-pier between hinged installation and fixed installation; during arch raising, the arch foot V-pier of the main bridge arch is rotated to release part of the axial force in the main bridge arch, convert part of the force of the bridge arch into the force of the bridge, and reduce the horizontal thrust of the arch foot of the main bridge arch; after the arch raising is completed, the arch foot V-pier is fixedly installed on the pedestal pile foundation, thereby meeting the installation requirements of large-span bridge arches on soft soil foundations and facilitating the installation of large-span bridge arches; by actively adjusting the balance state of the main bridge arch structure, it is beneficial to improve the installation stability of large-span bridge construction; the three-limb star-shaped pedestrian landscape bridge achieves a beautiful bridge architectural effect.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. The anchor cable tensioning structure tensions the tensioning rod, and adopts a three-pronged structure for simultaneous tensioning; the tensioning rod drives the rear end of the arch limb to rotate at the hinge of the arch foot V pier, so that the other end of the limb is arched, thereby facilitating the arch raising operation of the main bridge arch; after the tensioning rod is stretched to the design value, the main bridge arch completes the arch raising operation; after the arch raising is completed, the three arch limbs are rigidly connected, that is, the construction work of the three-limb star-shaped pedestrian landscape bridge steel structure is completed; the main bridge arch of the technical solution of this application adopts an upper-supported arch foot V-pier hinged bridge structure, by applying tensioning force to the rear ends of the three arch limbs of the main bridge arch, the arch foot V pier of the main bridge arch rotates, releasing part of the axial force in the main bridge arch, converting part of the force of the bridge arch into the force of the bridge, reducing the horizontal thrust of the arch foot of the main bridge arch, thereby meeting the installation requirements of large-span bridge arches on soft soil foundations, and actively adjusting the balance state of the main bridge arch structure is conducive to improving the installation stability of the bridge construction; and the three-limb star-shaped pedestrian landscape bridge achieves a beautiful bridge construction effect;

[0036] 2. The prestressed steel strands are connected to supporting steel pipes and metal bellows at both ends to form an internal bundle tensioning structure. After the prestressed steel strands are tensioned, they can be fixed by grouting through vacuum grouting pipes and supporting steel pipes. This allows the entire prestressed steel strand to be fixed to the pile foundation after the arching is completed, while meeting the requirements of the initial tensioning and arching operations. The vacuum grouting pipes and grouting pipes facilitate the spraying and fixing of the prestressed steel strands, making the operation more convenient.

[0037] 3. The arch foot V-pier can be rotated vertically so that after the main bridge arch is connected, the anchor cable tensioning structure can be used to tension the rear end of the arch foot V-pier, so that the arch foot V-pier drives the arch foot position of the main bridge arch to arch upward, thus completing the arch raising operation of the main bridge arch; the arch raising of this application reasonably arranges the construction steps of the installation structure of the main bridge arch, and adopts the hinged installation and fixed installation conversion of the arch foot V-pier; when raising the arch, the arch foot V-pier of the main bridge arch is rotated to release part of the axial force in the main bridge arch, convert part of the force of the bridge arch into the force of the bridge, and reduce the horizontal thrust of the arch foot of the main bridge arch. After the arch raising is completed, the arch foot V-pier is fixedly installed on the pedestal pile foundation, thereby meeting the installation requirements of large-span bridge arches on soft soil foundations, and actively adjusting the balance state of the main bridge arch structure is conducive to improving the installation stability of bridge construction; the three-limb star-shaped pedestrian landscape bridge achieves a beautiful bridge construction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the overall installation structure of the rear anchor V-pier of the steel structure of a three-limb star-shaped pedestrian landscape bridge in an embodiment of the present application.

[0039] Figure 2 This is a schematic diagram of the installation structure of the rear anchor V-pier of the steel structure of a three-limb star-shaped pedestrian landscape bridge in an embodiment of the present application from another perspective.

[0040] Figure 3 This is a schematic diagram of the installation structure of the arch foot V pier and the pedestal pile foundation of the rear anchor V pier of the steel structure of a three-limb star-shaped pedestrian landscape bridge in an embodiment of the present application.

[0041] Figure 4 yes Figure 3 AA view in .

[0042] Figure 5 This is a schematic diagram of the installation structure of the anchor cable tensioning structure of the rear anchor V-pier of the steel structure of a three-limb star-shaped pedestrian landscape bridge in an embodiment of the present application.

[0043] Figure 6 This is a schematic diagram of the installation structure of the pedestal pile foundation, one-way hinge assembly and fixed hinge seat of the anchor cable tensioning structure of the rear anchor V-pier of the three-limb star-shaped pedestrian landscape bridge steel structure in an embodiment of the present application.

[0044] Figure 7 yes Figure 6 BB view in .

[0045] Figure 8 This is a schematic diagram of the installation structure of a one-way hinge assembly of a rear anchor V-pier of a three-limb star-shaped pedestrian landscape bridge steel structure in an embodiment of the present application.

[0046] Figure 9This is a schematic diagram of the installation structure from another perspective of the one-way hinge assembly of the rear anchor V-pier of the steel structure of a three-limb star-shaped pedestrian landscape bridge in an embodiment of the present application.

[0047] Figure 10 yes Figure 6 CC view in .

[0048] Description of reference numerals:

[0049] 1. Arch foot V-pier; 2. Cap pile foundation; 21. Rock-embedded pile; 22. Reinforced concrete cap; 23. Anchor bolt; 3. Tie rod; 31. Vacuum grouting pipe; 32. Grouting pipe; 4. Anchor cable tensioning structure; 41. Matching steel pipe; 42. P anchor; 43. Anchor steel mesh; 44. Anchor spiral reinforcement; 45. Steel anchor beam; 46. Metal bellows; 5. One-way hinge assembly; 51. First ear plate; 52. Second ear plate; 53. Pin; 6. Fixed hinge seat; 61. Welded steel plate; 62. Bearing plate; 63. Shear connector; 64. Boot beam; 90. Pedestrian landscape bridge; 91. Main bridge arch; 911. Arch limb. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1-10 This application is described in further detail.

[0051] The embodiment of the present application discloses a three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V pier. Figure 1 and Figure 2 The three-limb star-shaped pedestrian landscape bridge 90 includes a main bridge arch 91 provided with three arch limbs 911, and the three arch limbs 911 are connected in a three-limb star shape, one of the arch limbs 911 is connected to a pedestrian ramp; in this embodiment, the steel structure rear anchor V pier of the pedestrian landscape bridge 90 is applied to the main bridge arch 91 of the pedestrian landscape bridge 90.

[0052] Reference Figure 2 and Figure 3 The rear anchor V-pier of the three-limb star-shaped pedestrian landscape bridge 90 steel structure includes an upper-supported arch foot V-pier 1; the rear end of each arch limb 911 is provided with an arch foot V-pier 1; the top of the arch foot V-pier 1 is connected to the arch limb 911, and the bottom of the arch foot V-pier 1 is hinged with a pedestal pile foundation 2 for pre-cast on the construction ground; a pull rod 3 is connected between the rear end of the arch limb 911 and the pedestal pile foundation 2, and the pedestal pile foundation 2 is provided with an anchor cable tensioning structure 4 for tensioning the pull rod 3; the anchor cable tensioning structure 4 applies a tensioning force to the rear ends of the three arch limbs 911 of the main bridge arch 91, so that the arch foot V-pier 1 of the main bridge arch 91 rotates, releasing part of the axial force in the main bridge arch 91, converting part of the force of the bridge arch into the force of the bridge, reducing the horizontal thrust of the arch foot of the main bridge arch 91, thereby meeting the installation requirements of large-span bridge arches on soft soil foundations.

[0053] Reference Figure 2and Figure 3 The cap pile foundation 2 includes a plurality of rock-socketed piles 21 arranged at vertical intervals and a reinforced concrete cap 22 cast on top of the plurality of rock-socketed piles 21. The plurality of rock-socketed piles 21 form a foundation pile group. A concrete cushion layer for fixing on a soft soil layer is provided on the bottom side of the cap pile foundation 2. The foundation pile group and concrete cushion layer formed by the plurality of rock-socketed piles 21 arranged at intervals are suitable for construction sites with relatively soft soft soil layers. The dispersed plurality of rock-socketed piles 21 improve the overall stiffness of the entire cap pile foundation 2.

[0054] Reference Figure 3 and Figure 4 A one-way hinge assembly 5 is provided at the bottom of the arch foot V pier 1; multiple groups of one-way hinge assemblies 5 are arranged at intervals, multiple pull rods 3 are arranged at intervals, and multiple groups of anchor cable tensioning structures 4 are provided corresponding to the multiple pull rods 3; in this embodiment, five groups of one-way hinge assemblies 5 are arranged at intervals on each arch foot V pier 1, and sixteen groups of anchor cable tensioning structures 4 (not shown in the figure) are arranged at intervals on the rear end of each arch foot V pier 1; since the arch foot V pier 1 and the main bridge arch 91 have a heavy self-weight, using multiple pull rods 3 and multiple groups of anchor cable tensioning structures 4 to apply tensioning force together when arching is performed is beneficial to applying tensioning force to the arch foot V pier 1, so as to drive the arch foot V pier 1 to drive the main bridge arch 91 to arch to the design value.

[0055] Reference Figure 5 , the pull rod 3 includes a prestressed steel bundle; the anchor cable tensioning structure 4 includes an anchor jack (not shown) and a matching steel pipe 41 and a P anchor 42 pre-buried on the cap pile foundation 2; the anchor jack is an anchor jack in the prior art; the matching steel pipe 41 is sleeved on the prestressed steel bundle; the anchor jack is installed at the rear end of the arch limb 911; the anchor jack is tensionedly connected to one end of the prestressed steel bundle, and the other end of the prestressed steel bundle passes through the anchor hole of the P anchor 42 and is fixedly buried in the cap pile foundation 2; before the construction of the cap pile foundation 2, the P anchor 42 and the matching steel pipe 41 need to be pre-positioned and buried, so that one end of the prestressed steel bundle passes through the matching steel pipe 41 and the P anchor 42 in sequence and is buried inside the cap pile foundation 2; the end of the prestressed steel bundle connected to the P anchor 42 is buried inside the cap pile foundation 2 to form a fixed end, and the end of the prestressed steel bundle connected to the anchor jack is tensionedly connected to form a tensioned end.

[0056] Reference Figure 5 The anchor cable tensioning structure 4 includes an anchor steel mesh 43, an anchor spiral bar 44 and a steel anchor beam 45; the anchor steel mesh 43 is pre-buried and cast in the pile foundation 2, and the bottom of the prestressed steel bundle passes through the anchor spiral bar 44 and is connected to the anchor steel mesh 43 and the P anchor 42 in sequence; the steel anchor beam 45 is rigidly connected to the arch limb 911; the top of the prestressed steel bundle is connected to the steel anchor beam 45; the steel anchor beam 45 is used to fix the anchor jack, and the prestressed steel bundle passes through the anchor hole of the steel anchor beam 45 to facilitate the anchor jack to tension the prestressed steel bundle.

[0057] Reference Figure 5 The prestressed steel bundle is connected with a vacuum grouting pipe 31 and a grouting pipe 32; the bottom end of the vacuum grouting pipe 31 is buried in the pedestal pile foundation 2 and is connected with the matching steel pipe 41, and the top end of the vacuum grouting pipe 31 extends out of the top of the pedestal pile foundation 2; the top of the prestressed steel bundle is sleeved with a matching steel pipe 41; the grouting pipe 32 passes through the steel anchor beam 45 and is connected with the matching steel pipe 41; after the prestressed steel bundle is tensioned, it is grouted and fixed through the vacuum grouting pipe 31 and the matching steel pipe 41, so as to meet the early tensioning and arching operations while also fixing the entire prestressed steel bundle on the pedestal pile foundation 2 after the bridge arching is completed; the vacuum grouting pipe 31 and the grouting pipe 32 facilitate the spraying and fixing of the prestressed steel bundle.

[0058] Reference Figure 5 The prestressed steel bundle is provided with a metal bellows 46, and the opposite ends of the metal bellows 46 are detachably connected to the two matching steel pipes 41 respectively; during construction, the opposite ends of the metal bellows 46 can be sleeved and tied to the matching steel pipes 41; the metal bellows 46 can be stretched to provide stretching space for the prestressed steel bundle; the prestressed steel bundle forms a tensioning structure in the form of an internal bundle through the matching steel pipes 41 and the metal bellows 46 at both ends; so that after the prestressed steel bundle is tensioned, that is, after the arch is completed, the entire prestressed steel bundle is fixed on the base pile foundation 2; the vacuum grouting pipe 31 and the slurry outlet pipe 32 facilitate the spraying and fixing of the prestressed steel bundle.

[0059] Reference Figures 8 to 10 The one-way hinge assembly 5 includes a first ear plate 51, a second ear plate 52 and a pin 53; the first ear plate 51 is connected to the bottom of the arch foot V pier 1, the second ear plate 52 is connected to the pedestal pile foundation 2, and the pin 53 passes through the first ear plate 51 and the second ear plate 52 in the horizontal direction, and the first ear plate 51 and the second ear plate 52 are hinged through the pin 53; the first ear plate 51, the second ear plate 52 and the pin 53 realize a one-way hinged structure with the horizontal direction as the axis; the arch foot V pier 1 is vertically rotated with the pin 53 as the axis, and the arch foot V pier 1 is hinged to the pedestal pile foundation 2 through the one-way hinge assembly 5 at the bottom, so that the anchor cable tensioning structure 4 can complete the arching effect of the three arch limbs 911 through the tensioning rod 3.

[0060] Reference Figure 6 and Figure 7The arch foot V pier 1 is provided with a fixed hinge seat 6; five sets of one-way hinge assemblies 5 are installed in the fixed hinge seat 6; the bottom side of the fixed hinge seat 6 is connected to the anchor bolt 23 pre-buried in the cap pile foundation 2, and the top side of the fixed hinge seat 6 is provided with a welded steel plate 61, and a gap is provided between the welded steel plate 61 and the arch foot V pier 1; the arch foot V pier 1 is provided with a hinged state and a consolidated state. Before and when the arch foot V pier 1 arches, the arch foot V pier 1 is hingedly connected to the cap pile foundation 2 at the bottom. , that is, the arch foot V pier 1 is in a hinged state; after the arch foot V pier 1 drives the main bridge arch 91 to complete the arch raising operation, the arch foot V pier 1 needs to be fixed in a consolidated state; this is beneficial to improving the installation stiffness and stability of the bridge after the bridge is completed; the fixed hinge seat 6 is used to provide protection for the hinged structure of the arch foot V pier 1, and when the arch foot V pier 1 is encapsulated and consolidated with concrete in the later stage, the fixed hinge seat 6 is used for pouring to cast and fix the bottom of the arch foot V pier 1 on the pressure plate 62.

[0061] Reference Figure 6 and Figure 7 The fixed hinge seat 6 is connected to a pressure plate 62 and a shear connector 63 pre-buried in the pedestal pile foundation 2. The shear connector 63 is installed on the side of the pressure plate 62 away from the fixed hinge seat 6. The pressure plate 62 is also connected to a fixing part for fixing the pressure plate 62 to the top of the pedestal pile foundation 2; the shear connector 63 can withstand and transmit the longitudinal shear force between the steel beam and the concrete slab in the pedestal pile foundation 2, and can also be used to resist the lifting effect between the pressure plate 62 and the steel beam; thereby, the shear connector 63 improves the shear effect of the pressure plate 62 and the pedestal pile foundation 2 when the arch foot V pier 1 rotates, which is beneficial to improve the installation strength of the pedestal pile foundation 2.

[0062] Reference Figure 6 and Figure 7 The pressure plate 62 is provided with a threaded hole, and a plurality of threaded holes are spaced apart along the periphery of the pressure plate 62; the fixing part includes a boot beam 64 fixed to the outer wall of the fixed hinge seat 6; a plurality of anchor bolts 23 are provided, and the plurality of anchor bolts 23 correspond one to one to the plurality of threaded holes; the boot beam 64 is fixed to the pressure plate 62, and the anchor bolts 23 pass through the boot beam 64 and are threadedly connected to the pressure plate 62 through the threaded holes; the anchor bolts 23 are used to fix the pressure plate 62 to the top of the pedestal pile foundation 2, and the pressure plate 62 improves the pressure strength of the pedestal pile foundation 2 when the arch foot V pier 1 rotates; multiple anchor bolts 23 improve the connection and stability effect between the pressure plate 62 and the boot beam 64, the pressure plate 62 and the pedestal pile foundation 2, which is beneficial to enhance the installation strength of the arch foot V pier 1.

[0063] The implementation principle of the rear anchor V-pier of the three-limb star-shaped pedestrian landscape bridge steel structure in the embodiment of the present application is as follows: the anchor cable tensioning structure 4 tensions the tie rod 3, and adopts a three-pronged structure for simultaneous tensioning; the tie rod 3 drives the rear end of the arch limb 911 to rotate at the hinge of the arch foot V-pier 1, so that the other end of the limb is arched, thereby facilitating the arch raising operation of the main bridge arch 91; after the tie rod 3 is tensioned to the design value, the main bridge arch 91 completes the arch raising operation; after the arch raising is completed, the three arch limbs 911 are rigidly connected, that is, the construction work of the three-limb star-shaped pedestrian landscape bridge 90 steel structure is completed; the upper-supported arch foot V-pier 1 hinged bridge structure applies tensioning force to the rear ends of the three arch limbs 911 of the main bridge arch 91, so that the arch foot V-pier 1 of the main bridge arch 91 rotates, releasing part of the axial force in the main bridge arch 91, converting part of the force on the bridge arch into the force on the bridge, reducing the horizontal thrust of the arch foot of the main bridge arch 91, thereby meeting the installation requirements of large-span bridge arches on soft soil foundations.

[0064] In another embodiment, a construction method for a rear-anchored V-pier of a three-limb star-shaped pedestrian landscape bridge steel structure is disclosed, comprising the following steps:

[0065] S1, erecting a temporary trestle along the extending direction of the three arch limbs 911 of the main bridge arch 91, and excavating foundation pits at the arch feet of the three arch limbs 911 of the main bridge arch 91 and pouring the pile foundation 2;

[0066] S2. Install arch foot V-piers 1 at the arch foot positions of the three arch limbs 911 of the main bridge arch 91, so that the bottom end of the arch foot V-pier 1 is hinged to the cap pile foundation 2; install tie rods 3 and an anchor cable tensioning structure 4 for tensioning the tie rods 3 at the rear end of the arch limbs 911, so that the top end of the arch foot V-pier 1 can complete vertical rotation;

[0067] S3, hoisting and splicing the prefabricated segments of the main bridge arch 91 on the temporary trestle, so that the three arch limbs 911 of the main bridge arch 91 are connected to form a three-limb star-shaped pedestrian landscape bridge 90;

[0068] S4. Dismantle the temporary trestle;

[0069] S5, start the anchor cable tensioning structure 4 to tension the tie rod 3 to the design value, so that the arch foot V pier 1 rotates relative to the pile foundation 2 to complete the arch rigid connection of the three arch limbs 911;

[0070] S6. Convert the arch foot V-pier 1 to a fixed structure, reinforce the arch foot V-pier 1 and the foundation piles with concrete, and backfill the foundation pit.

[0071] The embodiment of the present application performs arching operation through the arch foot V pier 1 and the anchor cable tensioning structure 4, and reasonably arranges the construction steps of the installation structure of the main bridge arch 91, adopts the installation mode conversion of the arch foot V pier 1 between hinged installation and fixed installation; when arching, the arch foot V pier 1 of the main bridge arch 91 is rotated to release part of the axial force in the main bridge arch 91, converting part of the force of the arch into the force of the bridge, reducing the horizontal thrust of the arch foot of the main bridge arch 91, and after the arching is completed, the arch foot V pier 1 is fixedly installed on the pile foundation 2, thereby meeting the installation requirements of large-span bridge arches on soft soil foundations and facilitating the installation of large-span bridge arches; by actively adjusting the balance state of the main bridge arch 91 structure, it is beneficial to improve the installation stability of large-span bridge construction. The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be covered within the scope of protection of the present application.

Claims

1. A three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V pier, the rear anchor V pier is applied to a main bridge arch (91) provided with three arch limbs (911), and the three arch limbs (911) are connected to form a three-limb star shape; characterized in that The rear anchor V-pier comprises an upper-supported arch foot V-pier (1); the rear end of each arch limb (911) is provided with the arch foot V-pier (1); the top of the arch foot V-pier (1) is connected to the arch limb (911), and the bottom of the arch foot V-pier (1) is hinged with a pedestal pile foundation (2) for pre-casting on the construction ground; a tension rod (3) is connected between the rear end of the arch limb (911) and the pedestal pile foundation (2), and the pedestal pile foundation (2) is provided with an anchor cable tensioning structure (4) for tensioning the tension rod (3); A one-way hinge assembly (5) is provided at the bottom of the arch foot V-pier (1); the one-way hinge assembly (5) comprises a first ear plate (51), a second ear plate (52) and a pin shaft (53); the first ear plate (51) is connected to the bottom of the arch foot V-pier (1), the second ear plate (52) is connected to the pedestal pile foundation (2), the pin shaft (53) passes through the first ear plate (51) and the second ear plate (52) in a horizontal direction, and the first ear plate (51) and the second ear plate (52) are hinged via the pin shaft (53).

2. The three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier according to claim 1 is characterized in that: The one-way hinge components (5) are arranged in multiple groups at intervals, the pull rods (3) are arranged in multiple groups at intervals, and the anchor cable tensioning structure (4) is arranged in multiple groups corresponding to the multiple pull rods (3).

3. The three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier according to claim 1 is characterized in that: The arch foot V-pier (1) is provided with a fixed hinge seat (6); the bottom side of the fixed hinge seat (6) is connected to the anchor bolt pre-buried in the base pile foundation (2); the top side of the fixed hinge seat (6) is provided with a welded steel plate, and a gap is provided between the welded steel plate and the arch foot V-pier (1).

4. The three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier according to claim 1 is characterized in that: The pull rod (3) includes a prestressed steel bundle; the anchor cable tensioning structure (4) includes an anchor jack and a matching steel pipe (41) and a P anchor (42) pre-buried on the pedestal pile foundation (2); the matching steel pipe (41) is sleeved on the prestressed steel bundle; the anchor jack is installed on the rear end of the arch limb (911); the anchor jack is tensionedly connected to one end of the prestressed steel bundle, and the other end of the prestressed steel bundle passes through the anchor hole of the P anchor (42) and is fixedly buried in the pedestal pile foundation (2).

5. The three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier according to claim 4 is characterized in that: The anchor cable tensioning structure (4) comprises an anchor steel mesh (43), an anchor spiral bar (44) and a steel anchor beam (45); the anchor steel mesh (43) is pre-buried and cast in the cap pile foundation (2); the bottom of the prestressed steel bundle passes through the anchor spiral bar (44) and is sequentially connected to the anchor steel mesh (43) and the P anchor (42); the steel anchor beam (45) is rigidly connected to the arch limb (911); and the top of the prestressed steel bundle is connected to the steel anchor beam (45).

6. The three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier according to claim 5, characterized in that: The prestressed steel bundle is connected with a vacuum grouting pipe (31) and a grouting pipe (32); the bottom end of the vacuum grouting pipe (31) is buried in the pedestal pile foundation (2) and is connected to the matching steel pipe (41), and the top end of the vacuum grouting pipe (31) extends out from the top of the pedestal pile foundation (2); the top of the prestressed steel bundle is sleeved with the matching steel pipe (41); the grouting pipe (32) passes through the steel anchor beam (45) and is connected to the matching steel pipe (41); the prestressed steel bundle is sleeved with a metal bellows (46), and the opposite ends of the metal bellows (46) are detachably connected to the two matching steel pipes (41).

7. The three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier according to claim 1, characterized in that: The cap pile foundation (2) comprises a plurality of rock-embedded piles (21) arranged at vertical intervals and a reinforced concrete cap (22) cast on top of the plurality of rock-embedded piles (21); the plurality of rock-embedded piles (21) form a foundation pile group; and a concrete cushion layer is provided on the bottom side of the cap pile foundation (2).

8. The three-limb star-shaped pedestrian landscape bridge steel structure rear anchor V-pier according to claim 3, characterized in that: The fixed hinge seat (6) is connected to a pressure plate (62) and a shear connector (63) pre-buried in the pedestal pile foundation (2); the shear connector (63) is installed on a side of the pressure plate (62) away from the fixed hinge seat (6); the pressure plate (62) is also connected to a fixing member for fixing the pressure plate (62) to the top of the pedestal pile foundation (2).

9. A construction method for a rear anchor V-pier of a three-limb star-shaped pedestrian landscape bridge steel structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: A temporary trestle is erected along the extending direction of the three arch limbs (911) of the main bridge arch (91), and foundation pits are excavated at the arch foot positions of the three arch limbs (911) of the main bridge arch (91) and then a cap pile foundation (2) is cast; An arch foot V-pier (1) is installed at the arch foot position of the three arch limbs (911) of the main bridge arch (91), so that the bottom end of the arch foot V-pier (1) and the base pile foundation (2) are hinged; a pull rod (3) and an anchor cable tensioning structure (4) for tensioning the pull rod (3) are installed at the rear end of the arch limb (911), so that the top end of the arch foot V-pier (1) can complete vertical rotation; The prefabricated segments of the main bridge arch (91) are hoisted and spliced on the temporary trestle so that the three arch limbs (911) of the main bridge arch (91) are connected to form a three-limb star-shaped pedestrian landscape bridge (90); dismantling of temporary trestle bridges; Starting the anchor cable tensioning structure (4) to tension the pull rod (3) to the design value, so that the arch foot V pier (1) rotates relative to the base pile foundation (2) to complete the arch rigid connection of the three arch limbs (911); The arch foot V-pier (1) is converted into a fixed structure, the arch foot V-pier (1) and the cap pile foundation (2) are reinforced by concrete encapsulation, and the foundation pit is backfilled.

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