Supporting system and construction method considering constant load transverse horizontal force and earthquake force

Abstract

The application relates to a supporting system and a construction method considering constant load transverse horizontal force and earthquake force, which are arranged between a bridge main beam and a pier top of a bridge pier and comprise: lateral stop blocks, including pier top stop blocks arranged on the pier top of the bridge pier and beam bottom stop blocks arranged on the bottom of the bridge main beam, which are used for limiting the transverse displacement of the bridge main beam under the action of constant load torsion; elastic body supports arranged between the pier top stop blocks and the beam bottom stop blocks, which are used for providing buffering to release earthquake force, the elastic body supports have a force measuring function and are used for monitoring the horizontal force between the bridge main beam and the bridge pier in the construction and operation stages; and balance cables, the two ends of which are anchored on the bridge main beam and the bridge pier respectively, which are used for adjusting the stress distribution of the bridge piers on both sides of the transverse bridge through adjusting cable force. Compared with the prior art, the application has the advantages of converting the constant load torsion effect into horizontal force that can be borne by the bridge pier, high integration, high efficiency and reliability, high adjustability, convenient construction, improved safety and seismic performance and the like.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a support system and construction method that takes into account both the lateral horizontal force of dead load and seismic force. Background Technology

[0002] In the process of urbanization, due to special terrain conditions or landscape requirements, conventionally symmetrical cable-stayed bridges and self-anchored suspension bridges often cannot meet the requirements. Bridges with significant spatial asymmetry are being used more and more.

[0003] Significantly asymmetrical cable-stayed bridges and self-anchored suspension bridges are widely used. Due to the significant asymmetry of their structures, these bridges not only experience horizontal torsion under live loads, temperature, and seismic forces, but more importantly, the main girder of the bridge also experiences torsion under dead loads. This torsion does not exist in conventional symmetrical bridges and requires measures to control it. The bridge torsion is safely and reasonably converted into the lateral horizontal force of the dead load borne by the piers. These measures also take into account the functions of seismic isolation and vibration reduction.

[0004] When the bridge deck is wide, cable-stayed bridges and self-anchored suspension bridges often adopt a transversely separated double pier arrangement. Measures need to be taken to ensure that the horizontal forces borne by the two piers in the completed bridge state are basically the same, and at the same time, the corresponding stress and deformation requirements can be met under seismic conditions.

[0005] CN202110424135.0 discloses a construction method for converting a self-anchored suspension bridge system using a cable-first, beam-later approach, comprising the following steps: Step 1: Constructing the main towers, auxiliary piers, and anchor beams on both sides, and erecting a catwalk; Step 2: Consolidating the anchor beams on both sides with the auxiliary piers; installing temporary cables; erecting the main cable, pre-biasing the cable saddles on the main towers towards the side span; relocating the catwalk to the main cable; Step 3: Tensioning the temporary cables, hoisting the steel box girder segments, and installing suspenders, with multiple temporary cable tensioning and saddle pushing interspersed during the hoisting process; Step 4: Releasing the consolidation and completing the side span closure; Step 5: Tensioning all the bridge suspenders, adjusting the main cable alignment and suspender cable tension, and then releasing the temporary cables in stages; Step 6: Removing the temporary cables, applying a second-stage dead load, fine-tuning the cable tension, and completing the system conversion. However, this method is complex, has a long construction process, and its applicability is limited. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the existing technology and provide a support system and construction method that takes into account both the horizontal force of dead load and seismic force. It safely converts the torsional effect of dead load into a horizontal force that the bridge pier can withstand. It has high integration, efficient and reliable coordination, high adjustability, convenient construction, and improves safety and seismic performance.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] This invention provides a support system that accommodates both lateral horizontal forces under dead load and seismic forces. The support system is positioned between the main girder of the bridge and the top of the pier, and includes:

[0009] Lateral blocks, including pier top blocks installed on the top of the piers and beam bottom blocks installed at the bottom of the main beam of the bridge, are used to limit the lateral displacement of the main beam of the bridge under dead load torsion.

[0010] An elastic bearing, installed between the pier top block and the beam bottom block, is used to provide buffering to release seismic forces. The elastic bearing has a force measuring function to monitor the horizontal force between the main beam and the pier during the construction and operation phases.

[0011] The balancing cable, with its two ends anchored to the main beam and pier of the bridge respectively, is used to adjust the force distribution across the bridge to the piers on both sides by adjusting the cable force.

[0012] Furthermore, the bridge is a spatially asymmetrical cable-stayed bridge or a self-anchored suspension bridge.

[0013] Furthermore, the bridge piers are arranged in a horizontally separated double-pier configuration.

[0014] Furthermore, a bidirectional sliding bearing is provided between the main girder of the bridge and the top of the pier to bear the vertical load transmitted from the main girder of the bridge and to allow the main girder of the bridge to undergo limited sliding displacement in the longitudinal and transverse directions.

[0015] Furthermore, the lateral stop and the elastic body support together constitute a limiting device. The lateral stop and the elastic body support cooperate to convert the dead load torsion of the main beam of the bridge into a lateral horizontal force borne by the pier.

[0016] Furthermore, the main tower of the bridge's main beam is a spatially asymmetric cable tower located at the mid-span of the main bridge.

[0017] Furthermore, a cable-stayed system is installed between the spatially asymmetric pylon and the main girder of the bridge.

[0018] This invention also provides a construction method for a support system that takes into account both lateral horizontal forces under dead load and seismic forces, comprising the following steps:

[0019] S1: During the construction of the bridge substructure, install the pier top stop and the lower fixed end of the balance cable;

[0020] S2: When installing the main beam of the upper bridge, install the bottom stop block, elastic body support and upper fixed end of the balance cable according to the preset gap;

[0021] S3: After the stay cables of the main girder of the bridge are tensioned, the main girder of the bridge will twist due to the spatial asymmetry effect until the bottom block of the beam, the top block of the pier and the elastic support between them on one side reach a close fit.

[0022] S4: Install the balancing cable;

[0023] S5: Based on the measured reaction force of the elastic support, tension the balance cable and adjust the stress state of the bridge piers on both sides in the transverse direction.

[0024] S6: After applying the second-stage dead load, the cable force of the balance cable is adjusted again based on the measured reaction force of the elastic support to make the force on both sides of the bridge piers in the transverse direction of the completed bridge reach equilibrium.

[0025] Furthermore, in S2, the elastomeric support is zero-point calibrated during installation.

[0026] Furthermore, the tensioning balance cable in S5 can make the forces on the two piers in the transverse direction of the bridge reach a balanced state.

[0027] The secondary adjustment of the balancing cable force in S6 can ensure that the forces on the two piers in the transverse direction of the bridge reach a balanced state in the final completed bridge condition.

[0028] The balancing cable not only adjusts the force distribution but also helps with earthquake resistance.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] (1) Using a simple structure to safely convert the torsional effect of dead load into a horizontal force that the bridge piers can withstand. In view of the technical problem that spatial asymmetric cable-stayed bridges and self-anchored suspension bridges generate huge torsional and lateral horizontal forces under dead load, this unfavorable torsional effect of dead load is safely and reasonably converted into a horizontal force that the bridge piers can withstand.

[0031] (2) High integration, efficient and reliable coordination. The lateral blocks and elastic supports integrate rigid limiting (resisting constant load), flexible buffer (dissipating seismic energy) and real-time monitoring (feedback of force data); the balance cable has the dual functions of active adjustment (optimizing the stress on the pier) and auxiliary seismic resistance; the bidirectional sliding bearing cooperates with the limiting device to release conventional deformation and concentrate on dealing with key loads.

[0032] (3) High adjustability and convenient construction. It can actively adjust the balancing cable force in key stages such as cable tensioning and second-stage dead load application based on measured data, and carry out fine "redistribution" and "re-optimization" of the internal force state of the structure.

[0033] (4) Improve safety and seismic performance. Through precise limit and force monitoring, the structure is kept under control and known throughout the entire process from construction to operation, avoiding unforeseen force concentration and damage; the transverse elastic support, as a flexible seismic defense line, can effectively buffer and dissipate seismic energy and reduce the impact of seismic forces on the substructure; the balancing cable can also serve as a second seismic fortification measure, comprehensively improving the overall seismic toughness of the bridge. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a spatially asymmetrical bridge (cable-stayed bridge).

[0035] Figure 2 This is a sectional view of a spatially asymmetrical bridge (cable-stayed bridge).

[0036] Figure 3 A schematic diagram of a support system designed to accommodate both lateral forces under dead load and seismic forces.

[0037] Reference numerals in the attached drawings: 1-Limiting device, 11-Elastic support, 12-Balance cable, 2-Bidirectional sliding support, 3-Pier, 31-Pier top stop, 4-Spatial asymmetric tower, 5-Bridge main beam, 51-Beam bottom stop, 6-Stay cable. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0039] Example 1

[0040] This embodiment provides a support system that takes into account both lateral horizontal forces under dead loads and seismic forces, such as... Figure 1-3 As shown, the support system is located between the main girder 5 of the bridge and the top of the pier 3, and includes:

[0041] Lateral blocks, including a pier top block 31 set on the top of the pier 3 and a beam bottom block 51 set on the bottom of the main beam 5 of the bridge, are used to limit the lateral displacement of the main beam 5 of the bridge under the torsional load.

[0042] An elastic support 11 is disposed between the pier top block 31 and the beam bottom block 51 to provide buffering to release seismic forces. The elastic support 11 has a force measuring function to monitor the horizontal force between the main beam 5 of the bridge and the pier 3 during the construction and operation phases.

[0043] The balancing cable 12 is anchored at both ends to the main beam 5 and the pier 3 of the bridge, respectively, and is used to adjust the force distribution of the bridge piers 3 on both sides in the transverse direction by adjusting the cable force.

[0044] Example 2

[0045] This embodiment provides a support system that takes into account both lateral horizontal forces under dead loads and seismic forces, such as... Figure 1-3 As shown, the support system is located between the main girder 5 of the bridge and the top of the pier 3, and includes:

[0046] Lateral blocks, including a pier top block 31 set on the top of the pier 3 and a beam bottom block 51 set on the bottom of the main beam 5 of the bridge, are used to limit the lateral displacement of the main beam 5 of the bridge under the torsional load.

[0047] An elastic support 11 is disposed between the pier top block 31 and the beam bottom block 51 to provide buffering to release seismic forces. The elastic support 11 has a force measuring function to monitor the horizontal force between the main beam 5 of the bridge and the pier 3 during the construction and operation phases.

[0048] The balancing cable 12 is anchored at both ends to the main beam 5 and the pier 3 of the bridge, respectively, and is used to adjust the force distribution of the bridge piers 3 on both sides in the transverse direction by adjusting the cable force.

[0049] In a specific implementation, the bridge is a spatially asymmetrical cable-stayed bridge.

[0050] In a specific implementation, the bridge pier 3 is a horizontally separated double bridge pier arrangement.

[0051] In a specific embodiment, a bidirectional sliding support 2 is provided between the main bridge beam 5 and the pier top of the pier 3 to bear the vertical load transmitted from the main bridge beam 5 and to allow the main bridge beam 5 to undergo limited sliding displacement in the longitudinal and transverse directions.

[0052] In a specific implementation, the lateral stop block and the elastic body support 11 together constitute the limiting device 1. The lateral stop block and the elastic body support 11 cooperate to convert the dead load torsion of the main beam 5 of the bridge into the lateral horizontal force borne by the pier 3.

[0053] In a specific implementation, the main tower of the bridge main beam 5 is a spatially asymmetric cable tower 4, located at the mid-span of the main bridge.

[0054] In a specific implementation, a stay cable 6 is provided between the spatially asymmetric pylon 4 and the main beam 5 of the bridge.

[0055] This embodiment also provides a construction method for a support system that takes into account both lateral horizontal forces and seismic forces, including the following steps:

[0056] S1: During the construction of the bridge substructure, install the pier top stop 31 and the lower fixed end of the balance cable 12;

[0057] S2: When installing the main beam 5 of the upper bridge, install the bottom stop block 51, the elastic support 11 and the upper fixed end of the balance cable 12 according to the preset gap.

[0058] S3: After the stay cables 6 of the main girder 5 of the bridge are tensioned, the main girder 5 of the bridge will be torn due to the spatial asymmetry effect until the bottom block 51, the top block 31 of the pier and the elastic support 11 between them on one side reach a close fit.

[0059] S4: Install balance cable 12;

[0060] S5: Based on the measured reaction force of the elastic support 11, tension the balance cable 12 to adjust the stress state of the bridge piers 3 on both sides in the transverse direction.

[0061] S6: After applying the second-stage dead load, the cable force of the balance cable 12 is adjusted again based on the actual measured reaction force of the elastic support 11, so that the force on the two piers 3 on both sides of the bridge in the transverse direction reaches equilibrium in the completed bridge state.

[0062] In a specific implementation, in S2, the elastic body support 11 is zero-point calibrated during installation.

[0063] In a specific implementation, the tensioning balance cable 12 in S5 can make the forces on the two piers 3 in the transverse direction of the bridge reach a balanced state.

[0064] The secondary adjustment of the balancing cable 12 in S6 can ensure that the forces on the two piers 3 in the transverse direction of the bridge reach a balanced state in the final completed bridge state.

[0065] The balancing cable 12 not only adjusts the force distribution but also serves to resist earthquakes.

[0066] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0067] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A support system that takes into account both lateral horizontal forces under dead load and seismic forces, characterized in that, The support system is located between the main beam (5) of the bridge and the top of the pier (3), and includes: Lateral blocks, including a pier top block (31) set on the top of the pier (3) and a beam bottom block (51) set on the bottom of the main beam (5) of the bridge, are used to limit the lateral displacement of the main beam (5) of the bridge under the torsion of the dead load. An elastic support (11) is provided between the pier top block (31) and the beam bottom block (51) to provide buffering to release seismic forces. The elastic support (11) has a force measuring function to monitor the horizontal force between the main beam (5) of the bridge and the pier (3) during the construction and operation phases. The balancing cable (12) is anchored at both ends to the main beam (5) and the pier (3) of the bridge, respectively, and is used to adjust the force distribution of the piers (3) on both sides of the bridge in the transverse direction by adjusting the cable force.

2. The support system that takes into account both lateral horizontal force and seismic force according to claim 1, characterized in that, The bridge is either a spatially asymmetrical cable-stayed bridge or a self-anchored suspension bridge.

3. The support system according to claim 1, which takes into account both lateral horizontal forces under dead load and seismic forces, is characterized in that... The bridge pier (3) is a horizontally separated double bridge pier arrangement.

4. A support system that takes into account both lateral horizontal forces under dead load and seismic forces according to claim 1, characterized in that, A bidirectional sliding bearing (2) is also provided between the main beam (5) of the bridge and the top of the pier (3) to bear the vertical load transmitted from the main beam (5) of the bridge and to allow the main beam (5) of the bridge to undergo limited sliding displacement in the longitudinal and transverse directions.

5. A support system that takes into account both lateral horizontal forces under dead load and seismic forces according to claim 1, characterized in that, The lateral stop and the elastic body support (11) together constitute the limiting device (1). The lateral stop and the elastic body support (11) cooperate to convert the dead load torsion of the main beam (5) of the bridge into the lateral horizontal force borne by the pier (3).

6. A support system that takes into account both lateral horizontal forces under dead load and seismic forces according to claim 1, characterized in that, The main tower of the main girder (5) of the bridge is a spatial asymmetric cable tower (4), located at the mid-span of the main bridge.

7. A support system that takes into account both lateral horizontal forces under dead load and seismic forces according to claim 6, characterized in that, A cable-stayed bridge (6) is provided between the spatially asymmetric pylon (4) and the main beam (5) of the bridge.

8. A construction method for a support system that takes into account both lateral horizontal forces and seismic forces as described in claim 7, characterized in that, Includes the following steps: S1: During the construction of the bridge substructure, install the lower fixed end of the pier top stop (31) and the balance cable (12); S2: When installing the upper bridge main beam (5), install the beam bottom block (51), elastic body support (11) and the upper fixed end of the balance cable (12) according to the preset gap; S3: After the stay cables (6) of the main beam (5) of the bridge are tensioned, the main beam (5) of the bridge will be torn due to the spatial asymmetry effect until the bottom block (51), the top block (31) of the pier and the elastic support (11) between them on one side reach a close fit. S4: Install the balance cable (12); S5: Based on the measured reaction force of the elastic support (11), tension the balance cable (12) and adjust the stress state of the bridge piers (3) on both sides of the transverse bridge. S6: After applying the second-stage dead load, the cable force of the balance cable (12) is adjusted again based on the actual reaction force measured by the elastic support (11) so that the forces on the two piers (3) in the transverse direction of the completed bridge are balanced.

9. A construction method for a support system that takes into account both lateral horizontal forces and seismic forces according to claim 8, characterized in that, In S2, the elastic support (11) is zero-point calibrated during installation.

10. A construction method for a support system that takes into account both lateral horizontal forces and seismic forces according to claim 8, characterized in that, The tensioning balance cable (12) in S5 can make the forces on the two piers (3) in the transverse direction of the bridge reach a balanced state; The secondary adjustment of the balancing cable (12) in S6 can make the forces on the two piers (3) in the transverse direction of the bridge reach a balanced state in the final bridge state. The balancing cable (12) is used to adjust the force distribution and also to resist earthquakes.

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