A construction device for symmetrical closure of arch ribs on both sides of a rigid vertical ring and a construction method thereof

Abstract

The application discloses a kind of rigid vertical ring both sides arch rib symmetry closure construction device and its construction method, it is related to bridge construction technical field, its technical key points include first jacking device, second jacking device, steel beam, two main piers, arch rib and arch rib assembly support, the top of two main piers is equipped with second jacking device, the top of second jacking device is arranged in steel beam bottom support, left and right arch rib is connected with steel beam, the bottom of arch rib assembly support is connected with steel beam, and the top of arch rib assembly support is connected with arch rib;The application forms left and right two closure openings at the top of rigid vertical ring, and adopts two sides symmetry closure mode, which is beneficial to reduce the risk of rigid vertical ring eccentric load caused by unilateral stress, improve stress balance during construction stage, because of the unique modeling of rigid vertical ring arranged in span, closure section is divided into two sections, avoids vault closure, i.e., corresponding reduces difficulty, controls bridge alignment.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a construction device and method for symmetrically closing the arch ribs on both sides of a rigid vertical ring. Background Technology

[0002] During the construction of through-arch bridges, mid-arch bridges, or other bridge structures with rigid vertical rings, the arch ribs typically need to be closed near the arch crown. For bridge types with rigid vertical rings, the rigid vertical rings themselves have high stiffness and vertical dimensions, and the force transfer relationship between them and the arch crown is quite sensitive during the construction phase. Therefore, problems such as difficulty in locating the closure joint, uneven force distribution on both sides, and complex control of the bridge's alignment are likely to occur during the closure phase.

[0003] Unlike conventional arch bridges, arch bridges with rigid vertical rings possess unique technical characteristics: the rigid vertical rings are positioned at the mid-span, naturally dividing the originally single arch closure joint into two independent closure joints, left and right. While this structural feature reduces the span of a single closure joint, it also introduces new technical challenges—the arch ribs on both sides need to achieve synchronous and symmetrical closure without disturbing the stress state of the rigid vertical rings. Existing construction methods are mostly designed for conventional single-closure arch bridges and are difficult to directly apply to this special structure with "double closure joints and a rigid intermediate node."

[0004] In existing construction methods, the closure joint is often adjusted by unilateral jacking, local elevation, temporary traction, or simply correcting the position of the arch crown. However, these methods often fail to simultaneously achieve both overall alignment adjustment of the arch ribs and local alignment accuracy of the closure joint. Especially when the rigid vertical ring is located at the mid-span or near the arch crown, adjusting only one side or a single position can easily lead to eccentric loading on the rigid vertical ring, thereby increasing the deviation between the construction state and the designed bridge state, making subsequent correction more difficult.

[0005] Furthermore, under high-altitude hoisting conditions, the left and right arch ribs to be joined often need to be connected synchronously or nearly synchronously within a limited working space. Without effective overall adjustment mechanisms, local fine-tuning mechanisms, and temporary guiding and locking measures, excessive height differences, excessive misalignment, longitudinal bridge offset, or secondary displacement during welding can easily occur during the joining process, thus affecting construction efficiency, on-site safety, and the final joining quality. Therefore, this paper provides a construction device and its application method for symmetrical joining of the arch ribs on both sides of a rigid vertical ring to solve the aforementioned problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention provides a construction device for the symmetrical closure of the arch ribs on both sides of a rigid vertical ring. This device can take into account the overall alignment adjustment, local elevation fine-tuning, temporary positioning of the closure joint, and symmetrical unloading control of the rigid vertical ring's symmetrical closure construction method, thereby reducing the risk of eccentric loading, improving construction accuracy, and ensuring that the rigid vertical ring's stress meets design requirements before and after bridge completion.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A construction device for symmetrical closure of two arch ribs on both sides of a rigid vertical ring includes a first lifting device, a second lifting device, a steel beam, two main piers, arch ribs, and an arch rib assembly bracket. The top of each of the two main piers is equipped with a second lifting device, and the top of each of the two second lifting devices is arranged on the bottom support of the steel beam. The arch ribs on both sides are connected to the steel beam. The bottom of the arch rib assembly bracket is connected to the steel beam, and the top of the arch rib assembly bracket is connected to the arch rib.

[0008] As a preferred embodiment of the present invention, the first jacking device includes a force transmission pad, a leveling support, and a vertical jack arranged sequentially from top to bottom. The leveling support is adapted to the bottom surface of the arch rib to be joined. The second jacking device includes a jack assembly, a distribution beam, and a pad layer arranged on the top of the main pier. The distribution beam is located between the jack assembly and the main pier and is used to distribute the jacking force.

[0009] As a preferred embodiment of the present invention, an arch rib assembly bracket is provided on each side of the rigid vertical ring, and at least six first lifting devices are provided on the top of each arch rib assembly bracket, and at least four second lifting devices are provided on the top of each main pier.

[0010] As a preferred embodiment of the present invention, the guide locking component is a temporary locking bolt, and the two sides of the temporary locking bolt are respectively connected to the arch rib closure section and the arch rib assembly bracket to restrict the relative displacement of the arch rib to be closed during the docking process.

[0011] A construction method based on the symmetrical closure of the arch ribs on both sides of a rigid vertical ring includes the following steps: S1. Determine the theoretical closure coordinates and adjustment amounts of the left and right closure points based on the designed bridge alignment; S2. Arch rib assembly brackets are erected on both sides of the rigid vertical ring, and a first lifting device is set on the top of each arch rib assembly bracket to support the corresponding arch rib to be joined. S3. A second lifting device for supporting the steel beam is installed on the top of the two main piers, so that the second lifting device can drive the corresponding arch rib to make overall alignment adjustment through the steel beam. S4. Symmetrically hoist the left and right sides of the arch ribs or closure section to the predetermined position; S5. Drive the second lifting device to adjust the overall shape of the two arch ribs and correct the longitudinal bridge displacement, and drive the first lifting device to make local fine adjustments to the elevation of the arch ribs near the closure joint, so that the left closure joint and the right closure joint meet the docking requirements respectively. S6. Install guide locking components at the left or right closure joint to temporarily position and constrain the docking position. S7. Complete the connection and fixation of the left closure joint and the right closure joint according to the principle of bilateral symmetry, and unload the first lifting device and the second lifting device in stages after the connection is completed.

[0012] In this embodiment, the determination of the theoretical closure coordinates and adjustment amount mentioned in S1 takes into account at least the design of the bridge alignment, ambient temperature, support elastic compression, segment manufacturing error, and previous segment installation deviation.

[0013] In this embodiment, in step S5, the second lifting device is used to make a coarse overall adjustment to the arch ribs on both sides, and the first lifting device is used to make a fine local adjustment to the arch ribs near the closure joint. At least one retest is performed between the overall coarse adjustment and the fine local adjustment.

[0014] In this embodiment, during the staged unloading in S7, part of the load of the first lifting device is first unloaded, then part of the load of the second lifting device is unloaded, and this process is repeated until the stress on both sides of the structure tends to stabilize before the arch rib assembly support is removed.

[0015] In this embodiment, during the construction process from S1 to S7, measurement reference points are set at the top of the arch, the arch rib to be joined, the arch rib assembly support, and the top of the main pier to obtain structural position parameters and the adjustment amount of each lifting device.

[0016] Compared with the prior art, the beneficial effects that this invention can achieve are: 1. By forming two closure openings on the left and right sides at the top of the rigid vertical ring and adopting a symmetrical closure method on both sides, the present invention helps to reduce the risk of eccentric load on the rigid vertical ring caused by unilateral force and improves the stress balance during the construction stage.

[0017] 2. By setting up a first lifting device and a second lifting device, the present invention divides the closure control into two levels: overall arch rib shaping adjustment and local fine-tuning of the closure joint. This allows for simultaneous control of overall alignment and local alignment accuracy.

[0018] 3. By setting a guide and locking component at the closure joint, the present invention can guide, limit, and temporarily lock the arch rib to be closed during the docking process, reducing the number of repeated high-altitude corrections and improving construction safety and work efficiency.

[0019] 4. The present invention uses a graded unloading method to release the construction load in the temporary support system, which helps to reduce abrupt deformation after closure and ensures that the structure gradually transitions to the target stress state. Attached Figure Description

[0020] Figure 1 This is a front view structural diagram of the present invention; Figure 2 A schematic cross-sectional view of the structure of the present invention embedded in the foundation; Figure 3 This is a front view schematic diagram of the first lifting device in this invention; Figure 4 This is a front view schematic diagram of the second lifting device in this invention.

[0021] The components include: 1. Steel beam; 2. Arch rib assembly support; 3. Main pier; 4. First jacking device; 5. Second jacking device; 6. Arch rib; 7. Jacking support; 8. Force transmission pad; 9. Leveling support; 10. Vertical jack; 11. Pad layer; 12. Distribution beam; 13. Jack assembly. Detailed Implementation

[0022] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0023] Example 1: This example proposes a construction device for symmetrical closure of the arch ribs on both sides of a rigid vertical ring.

[0024] The bridge structure addressed in this embodiment has the following characteristics: Due to the presence of the rigid vertical ring, the arch rib closure is not carried out at the traditional single arch crown position, but is naturally divided into two independent closure segments: the left closure segment and the right closure segment of the rigid vertical ring. By decomposing the closure task into two relatively independent sub-tasks and carrying out symmetrical construction on each side, the difficulty of adjusting a single closure segment is reduced, and it is also beneficial to control the accuracy of the completed bridge alignment.

[0025] A construction device for symmetrical closure of the arch ribs on both sides of a rigid vertical ring includes a first lifting device 4, a second lifting device 5, a steel beam 1, two main piers 3, arch ribs 6, and an arch rib assembly bracket 2. The top of each of the two main piers 3 is equipped with a second lifting device 5, and the top of each of the two second lifting devices 5 is connected to the steel beam 1. The left and right arch ribs 6 are connected to the steel beam 1. The bottom of the arch rib assembly bracket 2 is connected to the steel beam 1, and the top of the arch rib assembly bracket 2 is connected to the arch rib 6. The first lifting device 4 includes a force transmission pad 8 assembled from top to bottom, a leveling support 9 set below the arch rib 6 to be joined, and a vertical jack 10. The first lifting device 4 is used to adjust the vertical displacement of the arch rib 6 near the joining opening of the corresponding arch rib 6. A rigid vertical ring is set between the two arch ribs 6. The second jacking device 5 includes a jack group 13, a distribution beam 12, and a pad 11 that contacts the steel beam 1, which are installed on the top of the main pier 3. The second jacking device 5 is used to adjust the overall alignment and longitudinal displacement of the arch rib 6. An arch rib assembly bracket 2 is set on each side of the rigid vertical ring. At least six first jacking devices 4 are set on the top of each arch rib assembly bracket 2, and at least four second jacking devices 5 are set on the top of each main pier 3. The guide locking component is a temporary locking bolt. The two sides of the temporary locking bolt are connected to the closure section of the arch rib 6 and the arch rib assembly bracket 2 respectively to restrict the relative displacement of the arch rib 6 to be closed during the docking process.

[0026] The arch rib assembly support 2 can be composed of steel pipe columns, transverse connecting beams, diagonal braces, and distribution beams 12. The steel pipe columns are used to form the main load-bearing frame of the support, the transverse connecting beams and diagonal braces are used to improve the overall stability of the support, and the distribution beams 12 are set at the top of the support to distribute the local load transmitted by the first lifting device 4. At least 6 first lifting devices 4 can be set at the top of each arch rib assembly support 2. The first lifting devices 4 can be arranged at intervals along the length of the arch rib 6 to be closed, so as to provide multi-point support and elevation fine adjustment for the arch rib 6 near the closure opening.

[0027] The first lifting device 4 preferably includes a vertical jack 10, a force-transmitting pad 8, and a leveling support 9. The vertical jack 10 is used to generate lifting force, the force-transmitting pad 8 is used to evenly transmit the lifting load, and the leveling support 9 is set below the arch rib 6 to be joined, so as to adapt to the bottom shape of the arch rib 6 and improve the stress stability. By adjusting the lifting amount of the vertical jack 10, the vertical displacement of the arch rib 6 to be joined near the closure joint can be finely changed, thereby realizing height difference correction and misalignment control.

[0028] The second jacking device 5 is installed on the top of the main pier 3, and preferably includes a jack assembly 13, a distribution beam 12, and a cushion component 11. The distribution beam 12 is located between the jack assembly 13 and the main pier 3 to disperse the jacking reaction force; the cushion component 11 can be a steel plate cushion, a rubber cushion, or a pad block to improve the stress conditions of the contact surface. At least four second jacking devices 5 can be installed on the top of each main pier 3. By synchronously or in groups jacking and lowering the second jacking devices 5, the local elevation and stress state of the steel beam 1 can be adjusted, thereby driving the corresponding arch rib 6 to perform overall shape adjustment and longitudinal bridge displacement correction.

[0029] To prevent transverse or longitudinal movement of the arch rib 6 during the docking process, guide locking components are installed at the left and / or right docking openings. The guide locking components may include at least one of a guide plate, a limiting plate, a positioning ear plate, a temporary tie rod, and a temporary locking bolt. The guide plate guides the components to be docked in a predetermined direction, the limiting plate restricts transverse or longitudinal offset, and the positioning ear plate, temporary tie rod, and temporary locking bolt provide temporary fixation after the docking position meets the requirements to prevent secondary displacement during welding or fixing.

[0030] In actual engineering projects, the number of the first lifting device 4 and the second lifting device 5, the spacing between their arrangement, the form of the distribution beam 12, the specific composition of the guide locking components, and the symmetrical connection sequence can all be adaptively adjusted according to the bridge span, segment weight, construction space, and support conditions. As long as it adopts the technical approach of this invention, which combines overall shaping with local fine-tuning to achieve symmetrical closure of the arch ribs on both sides of the rigid vertical ring, it should be considered to fall within the protection scope of this invention.

[0031] Example 2: The preferred construction method of the present invention is implemented according to the following steps: S1. Measure and lay out the theoretical closure coordinates and determine the adjustment amounts. Establish construction control benchmarks based on the designed bridge alignment, and measure the actual position parameters of the arch crown section, the arch rib to be closed (6), the arch rib assembly support (2), and the top of the main pier (3). Considering ambient temperature, support elastic compression, segment manufacturing errors, and previous segment installation deviations, correct the theoretical connection positions of the left and right closure joints, obtaining the adjustment amounts corresponding to each measurement benchmark point.

[0032] S2, erect arch rib assembly supports 2 on both sides of the rigid vertical ring, and install the first jacking device 4 on the top of each arch rib assembly support 2. After the erection is completed, check the overall stability of the supports and the initial state of the jacking device to ensure that it is capable of supporting the arch ribs 6 to be joined and implementing local elevation fine-tuning.

[0033] S3, install second jacking devices 5 on the tops of the two main piers 3 respectively. The second jacking devices 5 contact the steel beam 1 through the padding component 11, enabling them to adjust the overall alignment of the left and right arch ribs 6 via the steel beam 1 during subsequent construction. After installation, verify the synchronicity and stress state of the second jacking devices 5.

[0034] S4. Using hoisting equipment, the left and right arch ribs 6 or closure sections to be joined are symmetrically hoisted to the predetermined positions. During the hoisting process, it is preferable to keep the construction progress on both sides basically the same to reduce the impact of the cantilever state on the rigid vertical ring. After the components approach the closure joint, the first jacking device 4 provides initial support.

[0035] S5, drive the second lifting device 5 to perform overall shaping and longitudinal bridge displacement correction of the two arch ribs 6, and drive the first lifting device 4 to perform local fine-tuning of the elevation of the arch ribs 6 near the closure joint. Preferably, the second lifting device 5 is used for overall coarse adjustment first, followed by local fine adjustment using the first lifting device 4, with at least one re-measurement between the overall coarse adjustment and the local fine adjustment. After multiple rounds of re-measurement and adjustment, the left and right closure joints are made to meet the docking requirements.

[0036] S6. Install guide locking components at the left and / or right closure joints. The relative displacement of the arch ribs 6 to be closed is limited by components such as guide plates and limit plates, and the docking positions are temporarily positioned and constrained by positioning ear plates, temporary tie rods or temporary locking bolts to ensure the stable progress of subsequent connection processes.

[0037] S7. Following the principle of symmetry, complete the connection and fixation of the left and right closure joints. The connection method can be symmetrical welding, symmetrical bolting, or a combination of welding and bolting. Preferably, a left-right alternating, segmented symmetrical fixation sequence is used to reduce additional deformation caused by localized heat input or sudden changes in connection stiffness. After connection, the first lifting device 4 and the second lifting device 5 are unloaded in stages. Preferably, part of the load on the first lifting device 4 is unloaded first, followed by part of the load on the second lifting device 5, and this process is repeated until the stress on both sides of the structure tends to stabilize, at which point the arch rib assembly bracket 2 is removed.

[0038] During the construction of sections S1 to S7, measurement benchmarks can be set at the top of the arch, the arch rib 6 to be closed, the arch rib assembly support 2, and the main pier 3. Structural position parameters and adjustment amounts for each lifting device can be obtained using total stations, levels, or other surveying equipment. Continuous comparison of the measurement results allows for timely correction of construction deviations, ensuring spatial accuracy and stress coordination during the symmetrical closure process on both sides.

[0039] Example 3: During construction, steel reinforcement supports will be added to the main pier 3 and inserted into the foundation. Multiple lifting supports 7 will be added to the bottom of the steel beam to work together with the steel reinforcement added to the main pier 3. The foundation consists of a thin layer of plain fill soil, followed by layers of silt, silty clay, fine sand, gravel, and a bottom layer of moderately weathered granite. The foundation is stable and firm. The steel reinforcement supports added to the main pier 3 will be directly inserted into the moderately weathered granite layer, while the lifting supports 7 at the bottom of the steel beam will only be inserted into the gravel layer.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction device for symmetrical closure of the arch ribs on both sides of a rigid vertical ring, characterized in that, include: Two main piers (3) are supported on top by steel beams (1); A rigid vertical ring, the bottom of which is fixed to the top of the mid-span of the steel beam (1); Two arch rib assembly supports (2) are respectively set on both sides of the rigid vertical ring, and their bottoms are connected to the steel beam (1); Multiple first lifting devices (4) are set at the top of the arch rib assembly bracket (2) to support and adjust the vertical displacement near the closure opening of the corresponding side arch rib (6) to be closed; Multiple second lifting devices (5) are set on the top of the main pier (3) and below the steel beam (1) to lift the steel beam (1) so as to drive the corresponding side arch ribs to make overall linear adjustment; The first lifting device (4) and the second lifting device (5) work together to achieve symmetrical closure of the two arch ribs.

2. The construction device for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 1, characterized in that: The first jacking device (4) includes a force transmission pad (8), a leveling support (9) and a vertical jack (10) arranged sequentially from top to bottom. The leveling support (9) is adapted to the bottom surface of the arch rib (6) to be joined. The second jacking device (5) includes a jack group (13), a distribution beam (12) and a pad layer (11) set on the top of the main pier (3). The distribution beam (12) is located between the jack group (13) and the main pier (3) and is used to distribute the jacking force.

3. The construction device for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 1, characterized in that: At least six first jacking devices (4) are provided on the top of the arch rib assembly brackets (2) on both sides of the rigid vertical ring, and at least four second jacking devices (5) are provided on the top of each main pier (3).

4. The construction device for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 1, characterized in that: It also includes a guide locking assembly, which includes at least one of a guide plate, a limiting plate, a positioning ear plate, a temporary tie rod, and a temporary locking bolt. The two sides of the guide locking assembly are respectively connected to the closure section of the arch rib (6) and the arch rib assembly bracket (2) to limit the relative displacement of the arch rib (6) to be closed during the docking process.

5. A construction method for symmetrically closing the arch ribs on both sides of a rigid vertical ring, characterized in that, The construction is carried out using the construction apparatus as described in any one of claims 1 to 4, and includes the following steps: S1. Fix the bottom of the rigid vertical ring to the top of the middle span of the steel beam (1) to form the positioning reference of the arch ribs on both sides. Determine the theoretical closure coordinates and adjustment amount of the left and right closure openings according to the designed bridge alignment. S2. Arch rib assembly brackets (2) are erected on both sides of the rigid vertical ring, and a first lifting device (4) is set on the top of each arch rib assembly bracket (2) to support the corresponding arch rib (6) to be joined. S3. A second lifting device (5) for supporting the steel beam (1) is set on the top of the two main piers (3), so that the second lifting device (5) can drive the corresponding arch rib (6) to make overall alignment adjustment through the steel beam (1); S4. The left and right arch ribs (6) or closure sections to be joined are symmetrically hoisted to the predetermined positions. S5. Drive the second lifting device (5) to adjust the overall shape and correct the longitudinal bridge displacement of the two arch ribs (6), and drive the first lifting device (4) to make local fine adjustments to the elevation of the arch ribs (6) near the closure joint, so that the left closure joint and the right closure joint meet the docking requirements respectively. S6. Install guide locking components at the left or right closure joint to temporarily position and constrain the docking position. S7. Complete the connection and fixation of the left closure opening and the right closure opening according to the principle of bilateral symmetry, and unload the first lifting device (4) and the second lifting device (5) in stages after the connection is completed.

6. The construction method for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 5, characterized in that: The determination of the theoretical closure coordinates and adjustment amounts described in S1 should at least take into account the design of the bridge alignment, ambient temperature, support elastic compression, segment manufacturing errors, and previous segment installation deviations.

7. The construction method for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 5, characterized in that: In S5, the second lifting device (5) is used to make a coarse overall adjustment to the two arch ribs (6), and the first lifting device (4) is used to make a fine local adjustment to the arch ribs (6) near the closure opening. At least one retest is performed between the overall coarse adjustment and the fine local adjustment.

8. The construction method for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 5, characterized in that: In S7, the left closure joint and the right closure joint are connected by symmetrical welding, symmetrical screwing, or a combination of welding and screwing, and are fixed in an alternating left-right, segmented symmetrical sequence.

9. The construction method for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 5, characterized in that: During the staged unloading in S7, part of the load of the first lifting device (4) is first removed, then part of the load of the second lifting device (5) is removed, and the process is repeated until the structure is stable under stress and then the arch rib assembly support (2) is removed.

10. The construction method for symmetrical closure of the arch ribs on both sides of a rigid vertical ring according to claim 5, characterized in that: During the construction of S1 to S7, measurement reference points were set at the top of the arch, the arch rib to be closed (6), the arch rib assembly support (2), and the main pier (3) to obtain structural position parameters and the adjustment amount of each lifting device.

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