Basket type steel arch bridge arch rib segmentation external expansion type accumulation integral lifting system and method

Abstract

The invention provides a basket type steel arch bridge arch rib segmentation external expansion type accumulation integral lifting system and method.The lifting system comprises a main beam temporary reinforcing mechanism, a middle section arch rib lifting mechanism and at least one or two adjacent section arch rib lifting mechanisms which are sequentially installed on a main beam; the main beam temporary reinforcing mechanism is arranged on the lower end face of the main beam, and the middle section arch rib lifting mechanism and the adjacent section arch rib lifting mechanism are both arranged on the upper end face of the main beam. Segmented external expansion type integral lifting is carried out through the middle section arch rib lifting mechanism and the adjacent section arch rib lifting mechanism, maximum height control over all lifting towers can be achieved, the towers are prevented from being too high, and the construction speed of the basket type steel arch bridge is increased; the horizontal steel cables are tensioned at the two ends of the middle section arch rib and the adjacent section arch rib after the middle section arch rib and the adjacent section arch rib are connected, configuration control over the arch rib in the overall lifting process can be achieved, and large deformation of the arch rib due to the dead weight in the lifting process is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of structural engineering, and particularly relates to a segmental outward expansion cumulative integral lifting system and method for the arch rib of a basket-type steel arch bridge. Background Art

[0002] With the increasing progress of construction technology, basket-type steel arch bridges have been widely used due to their good mechanical properties, economic performance and construction convenience. A basket-type steel arch bridge generally consists of bridge piers, steel arch ribs, main girders and suspension cables. Compared with traditional bridge structures, the unique structure of basket-type steel arch bridges has stronger stable load-bearing performance, and can thus bear higher loads and provide a larger span. It is widely applicable to construction conditions under various complex terrains. At the same time, the streamline shape of basket-type steel arch bridges also has high aesthetic value, which can provide a good visual effect for tourists and contribute to the image construction of the city.

[0003] However, basket-type steel arch bridges often face many technical and design challenges during construction and installation, including the large weight and size of the structure, which make construction and transportation difficult, complex geology and terrain affecting construction design, and configuration control and force state control during the erection of large spans. When facing these construction and installation problems, higher requirements are often put forward for the construction methods of basket-type steel arch bridges. The commonly used construction methods for existing basket-type steel arch bridges include segmental assembly method, integral hoisting method, bracket erection method, cable hoisting method, waterborne floating method, etc.

[0004] The segmental assembly method prefabricates each part of the bridge in segments, assembles them on site and gradually lifts them. It requires a smaller construction site area, but has a long construction period and high construction costs; the integral hoisting method fabricates the arch rib integrally on site and then directly uses large lifting equipment for integral hoisting and installation. It has a fast construction speed and simple construction technology, but places high requirements on the bearing capacity of the hoisting equipment and the construction site area; other methods such as the bracket erection method, cable hoisting method and waterborne floating method are usually only used for bridge construction under specific conditions, and these methods have high costs and limited application scenarios.

[0005] Generally speaking, in the construction of existing basket-type steel arch bridges, the most commonly used construction methods are usually the segmental assembly method and the integral hoisting method, and both of these methods generally require heavy cranes to work on the bridge, demanding high construction costs and construction conditions. If other methods are adopted, problems such as limited construction sites and non-meeting application scenarios may be faced. Summary of the Invention

[0006] The purpose of the present invention is to provide a segmental outward expansion cumulative integral lifting system for the arch rib of a basket-type steel arch bridge, so as to overcome the above-mentioned technical problems existing in the prior art.

[0007] Another object of the present invention is to provide a method for segmental outward expansion and cumulative integral lifting of the arch rib of a basket-type steel arch bridge, which greatly improves the construction efficiency of the arch rib and saves construction costs and construction periods.

[0008] To this end, the technical solution provided by the present invention is as follows: A system for segmental outward expansion and cumulative integral lifting of the arch rib of a basket-type steel arch bridge, the arch rib is symmetrically divided into 2n + 1 segments, and is symmetrically distributed from the middle to both ends as the middle arch rib, the adjacent arch rib and the side arch rib in sequence. The adjacent arch rib is at least one group, and includes a temporary reinforcement mechanism of the main beam, a lifting mechanism of the middle arch rib and a lifting mechanism of the adjacent arch rib that are successively installed on the main beam. The lifting mechanism of the adjacent arch rib is at least one group or two groups. The temporary reinforcement mechanism of the main beam is arranged on the lower end surface of the main beam, and the lifting mechanism of the middle arch rib and the lifting mechanism of the adjacent arch rib are both arranged on the upper end surface of the main beam. When the adjacent arch rib is one group, the lifting mechanism of the adjacent arch rib is one group, and the lifting mechanism of the middle arch rib is removed after the lifting mechanism of the adjacent arch rib is installed; When the adjacent arch rib is two groups or more, the lifting mechanism of the adjacent arch rib is at least two groups. After one group of adjacent arch ribs is lifted, the lifting mechanism of the other group of adjacent arch ribs is installed and the lifting mechanism of the previous group of adjacent arch ribs is removed.

[0009] The lifting mechanism of the middle arch rib includes a middle lifting tower, a jack one and a lifting sling one. The middle lifting tower is arranged on the main beam at both ends of the position where the middle arch rib is located. The jack one is arranged at the top of the middle lifting tower. One end of the lifting sling one is connected to the jack one, and the other end is connected to the end of the middle arch rib.

[0010] The lifting mechanism of the adjacent arch rib includes an adjacent lifting tower, a jack two and a lifting sling two. The adjacent lifting tower is arranged on the main beam at both ends of the position where the adjacent arch rib is located. The jack two is arranged at the top of the adjacent lifting tower. One end of the lifting sling two is connected to the jack two, and the other end is connected to the end of the adjacent arch rib.

[0011] The temporary reinforcement mechanism of the main beam includes a temporary reinforced cable-stayed beam and a support rod. The support rod is located directly below the predetermined position of the middle lifting tower, and the support rod is connected to the temporary reinforced cable-stayed beam.

[0012] It also includes a horizontal steel cable, and both ends of the horizontal steel cable are respectively connected to the outer ends of the two adjacent arch ribs.

[0013] Both ends of the temporary reinforced cable-stayed beam are fixed on the bottom beam at the pier, and the middle part of the temporary reinforced cable-stayed beam is welded or bolted to the support rod.

[0014] The support rod is a steel pipe or a steel section.

[0015] A method for cumulative integral lifting of the rib segments of a basket - type steel arch bridge by external expansion, comprising the following steps: Step 1) Lifting preparation: Complete the construction of permanent piers and main girders, and temporarily reinforce the main girder with a temporary reinforcement mechanism for the main girder; Step 2) Deck assembly: Symmetrically divide the arch rib into 2n + 1 segments according to the span of the arch rib, where n is an integer from 2 to 10. First, assemble the middle - segment arch rib in - situ on the deck, and then install the lifting mechanism for the middle - segment arch rib; Step 3) Lifting of the middle - segment arch rib: Uniformly lift the middle - segment arch rib through the lifting mechanism for the middle - segment arch rib until the end of the middle - segment arch rib reaches the position of the upper - end of the first - group adjacent - segment arch rib. Assemble and connect the middle - segment arch rib with the first - group adjacent - segment arch rib, and tension the horizontal steel cables at the lower ends of the two adjacent - segment arch ribs to control the configuration of the arch rib; Step 4) Lifting of the first - group adjacent - segment arch rib: First, install a set of lifting mechanisms for the adjacent - segment arch rib, then remove the lifting mechanism for the middle - segment arch rib. Then, uniformly and integrally lift the connected middle - segment arch rib and the first - group adjacent - segment arch rib by the lifting mechanism for the adjacent - segment arch rib until the lower - end of the first - group adjacent - segment arch rib reaches the position of the upper - end of the second - group adjacent - segment arch rib. Assemble and connect the first - group adjacent - segment arch rib with the second - group adjacent - segment arch rib, and tension the horizontal steel cables at the lower ends of the two adjacent - segment arch ribs of the first - group adjacent - segment arch rib; Step 5) Lifting of the second - group adjacent - segment arch rib: First, install another set of lifting mechanisms for the adjacent - segment arch rib, then remove the previous set of lifting mechanisms for the adjacent - segment arch rib. Then, uniformly and integrally lift the connected first - group adjacent - segment arch rib and the second - group adjacent - segment arch rib by the lifting mechanism for the adjacent - segment arch rib until the lower - end of the second - group adjacent - segment arch rib reaches the position of the upper - end of the third - group adjacent - segment arch rib. Assemble and connect the third - group adjacent - segment arch rib with the second - group adjacent - segment arch rib, and tension the horizontal steel cables at the lower ends of the two adjacent - segment arch ribs of the second - group adjacent - segment arch rib; Step 6) Repeat Step 5) to lift the remaining groups of adjacent - segment arch ribs until the lower - end of the last - group adjacent - segment arch rib reaches the position of the upper - end of the side - segment arch rib. Assemble and connect the last - group adjacent - segment arch rib with the side - segment arch rib; Step 7) Overall fixation: Fix the side - segment arch rib to the arch - foot support; then remove the horizontal steel cables, lifting towers, etc. Thus, the overall lifting of the arch rib is completed; finally, install the suspension cables and remove the temporary reinforcement mechanism for the main girder, and the construction of the arch bridge is completed.

[0016] When the arch rib is symmetrically divided into 2n + 1 segments according to the span of the arch rib in Step 2), the horizontal span of the segmented arch rib is 60 - 90m.

[0017] The beneficial effects of the present invention are: The basket - type steel arch bridge rib segment - external - expansion cumulative integral lifting system provided by the present invention conducts segment - external - expansion integral lifting through the middle - segment arch rib lifting mechanism and the adjacent - segment arch rib lifting mechanism, which can achieve the control of the maximum height of all lifting towers, avoiding excessive tower height; by tensioning horizontal steel cables at both ends after the connection of the middle - segment arch rib and the adjacent - segment arch rib, the configuration control during the integral lifting of the arch rib can be achieved, avoiding large deformations of the arch rib due to its own weight during the lifting process.

[0018] The method of the present invention symmetrically divides the arch rib into multiple segments, which can improve the construction speed of the basket - type steel arch bridge, avoid the hoisting operation of heavy cranes on the bridge, reduce the construction difficulty, greatly improve the construction efficiency of the arch rib, reduce the construction cost and save the construction period; greatly reduce the requirements for the performance of hoisting equipment, be applicable to super - large - span steel arch ribs and have low requirements for the construction site, and be applicable to various construction conditions and design conditions; have good popularization, and for basket - type steel arch bridges of different sizes, the number of segments can be flexibly increased or decreased to meet the construction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is an implementation schematic diagram of the preparation stage of the method of the present invention; Figure 3 is an implementation schematic diagram of the bridge deck assembly stage of the method of the present invention; Figure 4 is an implementation schematic diagram of the middle - segment arch rib lifting stage of the method of the present invention; Figure 5 is an implementation schematic diagram of the adjacent - segment arch rib lifting stage of the method of the present invention; Figure 6 is an implementation schematic diagram of the integral fixation stage of the method of the present invention.

[0020] In the figure: 1, permanent pier; 2, main beam; 3, temporary reinforced cable - stayed beam; 4, middle - segment arch rib; 5, adjacent - segment arch rib; 6, side - segment arch rib; 7, middle - segment lifting tower; 8, adjacent - segment lifting tower; 9, jack one; 10, lifting sling one; 11, horizontal steel cable; 12, arch - foot support; 13, sling; 14, support rod; 15, jack two; 16, lifting sling two. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0022] Reference is now made to the accompanying drawings to describe exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units / components are denoted by the same reference numerals.

[0023] Unless otherwise specified, the terms used herein (including technical terms) have the ordinary meaning understood by those skilled in the art. In addition, it can be understood that the terms defined in the commonly used dictionary should be understood to have a meaning consistent with the context of the relevant field, and should not be understood as idealized or overly formal meanings.

[0024] Embodiment 1 Embodiment 1 This embodiment provides a segmented outward-expanding cumulative integral lifting system for the arch ribs of a basket-type steel arch bridge. The arch ribs are symmetrically divided into 2n + 1 segments, which are symmetrically distributed from the middle to both ends as the middle arch rib 4, the adjacent arch rib 5, and the side arch rib 6 in sequence. The adjacent arch rib 5 has at least one group, and includes a temporary reinforcement mechanism for the main beam, a lifting mechanism for the middle arch rib, and a lifting mechanism for the adjacent arch rib that are successively installed on the main beam 2. The lifting mechanism for the adjacent arch rib has at least one group or two groups. The temporary reinforcement mechanism for the main beam is provided on the lower end surface of the main beam 2, and the lifting mechanism for the middle arch rib and the lifting mechanism for the adjacent arch rib are both provided on the upper end surface of the main beam 2. The segmented outward-expanding cumulative integral lifting system for the arch ribs of the basket-type steel arch bridge provided by the present invention can achieve the maximum height control of all lifting towers through the lifting mechanism for the middle arch rib and the lifting mechanism for the adjacent arch rib, avoid the tower being too high, and improve the construction speed of the basket-type steel arch bridge.

[0025] Embodiment 2 Based on Embodiment 1, this embodiment provides a segmented outward-expanding cumulative integral lifting system for the arch ribs of a basket-type steel arch bridge. When the adjacent arch rib 5 has one group, the lifting mechanism for the adjacent arch rib has one group, and the lifting mechanism for the middle arch rib is removed after the lifting mechanism for the adjacent arch rib is installed; When the adjacent arch rib 5 has two or more groups, the lifting mechanism for the adjacent arch rib has at least two groups. After one group of adjacent arch ribs 5 is lifted, the lifting mechanism for the other group of adjacent arch ribs is installed and the previous group of lifting mechanisms for the adjacent arch ribs is removed.

[0026] The composition and structure of each part of the two sets of temporary arch rib lifting mechanisms are the same. When there are multiple sets of temporary arch ribs 5, during the installation of the latter set of temporary arch rib lifting mechanisms, the spliced arch rib segments (including the middle arch rib 4 and the temporary arch rib 5) are suspended by the previous set of temporary arch rib lifting mechanisms. Therefore, at least two sets are required to ensure the cumulative overall lifting of the arch ribs. Similarly, the middle arch rib lifting mechanism can be removed only after the temporary arch rib lifting mechanism is installed.

[0027] Embodiment 3 Based on Embodiment 1, this embodiment provides a basket-type steel arch bridge arch rib segmental outward-expanding cumulative overall lifting system. As Figure 3 shown, the middle arch rib lifting mechanism includes a middle lifting tower 7, a first jack 9, and a first lifting sling 10. The middle lifting tower 7 is arranged on the main beam 2 at both ends of the position where the middle arch rib 4 is located. The first jack 9 is arranged at the top of the middle lifting tower 7. One end of the first lifting sling 10 is connected to the first jack 9, and the other end is connected to the end of the middle arch rib 4.

[0028] In this embodiment, the first jack 9 is a through-hole jack. One end of the first lifting sling 10 passes through the top of the middle lifting tower 7, and the other end is connected to the end of the middle arch rib 4.

[0029] Embodiment 4 Based on Embodiment 1, this embodiment provides a basket-type steel arch bridge arch rib segmental outward-expanding cumulative overall lifting system. The temporary arch rib lifting mechanism includes a temporary lifting tower 8, a second jack 15, and a second lifting sling 16. The temporary lifting tower 8 is arranged on the main beam 2 at both ends of the position where the temporary arch rib 5 is located. The second jack 15 is arranged at the top of the temporary lifting tower 8. One end of the second lifting sling 16 is connected to the second jack 15, and the other end is connected to the end of the temporary arch rib 5.

[0030] It further includes a horizontal steel cable 11. Both ends of the horizontal steel cable 11 are respectively connected to the outer ends of the two temporary arch ribs 5. As Figure 5 shown, by tensioning the horizontal steel cable 11 at the lower ends of the two temporary arch ribs 5, the shape control during the overall lifting of the arch ribs can be realized, and the arch ribs can be prevented from undergoing large deformations due to their own weights during the lifting process.

[0031] Embodiment 5 Based on Embodiment 3, this embodiment provides a basket-type steel arch bridge arch rib segmental outward-expanding cumulative overall lifting system. As Figure 2 shown, the main beam temporary reinforcement mechanism includes a temporary reinforced cable-stayed beam 3 and a support rod 14. The support rod 14 is located directly below the predetermined position of the middle lifting tower 7, and the support rod 14 is connected to the temporary reinforced cable-stayed beam 3.

[0032] The two ends of the temporary reinforced beam string structure 3 are fixed on the bottom beam at the pier, and the middle part of the temporary reinforced beam string structure 3 is welded or bolted to the support rod 14.

[0033] The support rod 14 is a steel pipe or a profiled steel.

[0034] The support rod 14 of the temporary reinforced beam string structure 3 is arranged directly below the predetermined positions of the two middle lifting towers 7 to ensure good reinforcement effect.

[0035] Embodiment 6 This embodiment provides a method for cumulative integral lifting of the basket - type steel arch bridge rib in a segmented and outward - expanded manner, including the following steps: Step 1) Lifting preparation: Complete the construction of the permanent piers 1 and the main beam 2, and use the main beam temporary reinforcement mechanism to temporarily reinforce the main beam 2; Step 2) Deck assembly: Divide the arch rib symmetrically into 2n + 1 segments according to the arch rib span, where n is an integer from 2 to 10. First, assemble the middle arch rib 4 in - situ on the deck, and then install the middle arch rib lifting mechanism; Step 3) Lifting of the middle arch rib 4: Uniformly lift the middle arch rib 4 through the middle arch rib lifting mechanism until the end of the middle arch rib 4 reaches the position of the upper end of the first group of adjacent arch ribs 5. Assemble and connect the middle arch rib 4 with the first group of adjacent arch ribs 5, and tension the horizontal steel cables 11 at the lower ends of the two adjacent arch ribs 5 in the first group to control the arch rib configuration; Step 4) Lifting of the first group of adjacent arch ribs 5: First, install a group of adjacent arch rib lifting mechanisms, then remove the middle arch rib lifting mechanism. Then, uniformly and integrally lift the connected middle arch rib 4 and the first group of adjacent arch ribs 5 by the adjacent arch rib lifting mechanism until the lower end of the first group of adjacent arch ribs 5 reaches the position of the upper end of the second group of adjacent arch ribs. Assemble and connect the first group of adjacent arch ribs 5 with the second group of adjacent arch ribs 5, and tension the horizontal steel cables 11 at the lower ends of the two adjacent arch ribs 5 in the second group; Step 5) Lifting of the second group of adjacent arch ribs 5: First, install another group of adjacent arch rib lifting mechanisms, then remove the previous group of adjacent arch rib lifting mechanisms. Then, uniformly and integrally lift the connected first group of adjacent arch ribs 5 and the second group of adjacent arch ribs 5 by the adjacent arch rib lifting mechanism until the lower end of the second group of adjacent arch ribs 5 reaches the position of the upper end of the third group of adjacent arch ribs 5. Assemble and connect the third group of adjacent arch ribs 5 with the second group of adjacent arch ribs 5, and tension the horizontal steel cables 11 at the lower ends of the two adjacent arch ribs 5 in the third group; Step 6) Repeat Step 5) to lift the remaining groups of adjacent arch ribs 5 until the lower end of the last group of adjacent arch ribs 5 reaches the position of the upper end of the side arch rib 6. Assemble and connect the last group of adjacent arch ribs 5 with the side arch rib 6; Step 7) Overall fixation: Fix the side segment arch rib 6 to the arch foot support 12; then remove the horizontal steel cable 11, the temporary lifting tower for adjacent segments, etc. At this point, the overall lifting of the arch rib is completed; finally, install the sling 13 and remove the temporary reinforcement mechanism of the main girder, and the construction of the arch bridge is completed.

[0036] When the arch rib is symmetrically divided into 2n + 1 segments according to the span of the arch rib in Step 2), the horizontal span of the segmented arch rib is 60 - 90 m.

[0037] The method of the present invention symmetrically divides the arch rib into multiple segments of arch ribs, and successively lifts the spliced arch ribs through the middle segment arch rib lifting mechanism and the adjacent segment arch rib lifting mechanism respectively. The overall lifting of the arch rib is achieved through cumulative lifting, avoiding the hoisting operation of heavy cranes on the bridge, reducing the construction difficulty, greatly improving the construction efficiency of the arch rib, reducing the construction cost and saving the construction period.

[0038] Embodiment 7 Based on Embodiment 6, this embodiment provides a cumulative overall lifting system for the outward expansion of the segmented arch rib of a basket - type steel arch bridge. In this embodiment, n is 2, that is, the arch rib of the arch bridge is symmetrically divided into 5 segments (1 middle segment arch rib 4, 1 group of adjacent segment arch ribs 5, and 1 group of side segment arch ribs 6) and then cumulatively lifted as a whole. The specific process is as follows: The first step is the lifting preparation: Before the assembly and overall lifting of the arch rib, first complete the construction of the permanent pier 1, the main girder 2, and the construction of temporarily reinforcing the main girder 2 with the temporarily reinforcing cable - stayed beam 3, as Figure 2 shown; among them, the support rod 14 of the temporarily reinforcing cable - stayed beam 3 is arranged directly below the predetermined positions of the two middle segment lifting towers 7, as Figure 1 shown.

[0039] The second step is the deck assembly: The arch rib is symmetrically divided into five segments. First, assemble the middle segment arch rib 4 in - situ on the deck, and then install the middle segment arch rib lifting mechanism: Erect the middle segment lifting tower 7, set a through - hole jack (jack one 9) at the top of the tower, and then set the lifting sling one 10, one end of which passes through the through - hole jack at the top of the tower and the other end is connected to the end of the middle segment arch rib 4. As Figure 3 shown.

[0040] The third step is the lifting of the middle segment arch rib 4: Lift the middle segment arch rib 4 evenly until the end of the middle segment arch rib 4 reaches the position of the upper - side end of the adjacent segment arch rib 5, assemble and connect the middle segment arch rib 4 with the adjacent segment arch rib 5, and tension the horizontal steel cable 11 at the lower ends of the two adjacent segment arch ribs 5 to control the configuration of the arch rib. As Figure 4 shown.

[0041] The fourth step is the lifting of the temporary segment arch rib 5: First, erect the temporary segment lifting tower crane 8 (erect the temporary segment lifting tower crane 8, set the second jack 15 at the top of the temporary segment lifting tower crane 8, and then set the second lifting sling 16, one end of which passes through the second jack 15 and the other end is connected to the end of the temporary segment arch rib 5), remove the middle segment lifting tower crane 7, and uniformly and integrally lift the connected middle segment arch rib 4 and the temporary segment arch rib 5 until the lower end of the temporary segment arch rib 5 reaches the position of the upper end of the side segment arch rib 6, and assemble and connect the temporary segment arch rib 5 and the side segment arch rib 6. As Figure 5 shown.

[0042] The fifth step is the overall fixation: Fix the side segment arch rib 6 and the arch foot support 12, and then remove the horizontal steel cable 11, the temporary segment lifting tower crane 8, etc. Thus, the overall lifting of the arch rib is completed; finally, install the sling 13, and the construction of the arch bridge is completed. As Figure 6 shown.

[0043] The above examples are only illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design identical or similar to the present invention falls within the protection scope of the present invention.

Claims

1. A basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system, the arch rib is symmetrically divided into 2n+1 sections, and is symmetrically distributed from the middle to the two ends into middle arch ribs, adjacent arch ribs and side arch ribs, and the adjacent arch ribs are at least one group, characterized in that: It includes a main beam temporary reinforcement mechanism, a middle section arch rib lifting mechanism and an adjacent section arch rib lifting mechanism which are successively installed on the main beam, the adjacent section arch rib lifting mechanism is at least one group or two groups, the main beam temporary reinforcement mechanism is arranged on the lower end surface of the main beam, and the middle section arch rib lifting mechanism and the adjacent section arch rib lifting mechanism are both arranged on the upper end surface of the main beam.

2. According to claim 1, a basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system is characterized in that: When the adjacent arch ribs are a group, the adjacent arch rib lifting mechanism is a group, and the intermediate arch rib lifting mechanism is removed after the adjacent arch rib lifting mechanism is installed; When there are two or more groups of adjacent arch ribs, there are at least two groups of adjacent arch rib lifting mechanisms. After one group of adjacent arch ribs is lifted, another group of adjacent arch rib lifting mechanisms is installed and the previous group of adjacent arch rib lifting mechanisms is removed.

3. According to claim 1, a basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system is characterized in that: The middle section arch rib lifting mechanism includes a middle section lifting tower, a jack and a lifting rope. The middle section lifting tower is installed on the main beam and is located at both ends of the middle section arch rib. The jack is installed at the top of the middle section lifting tower. One end of the lifting rope is connected to the jack, and the other end is connected to the end of the middle section arch rib.

4. According to claim 1, a basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system is characterized in that: The temporary section arch rib lifting mechanism includes a temporary section lifting tower, two jacks and two lifting cables. The temporary section lifting tower is installed on the main beam and is located at both ends of the temporary section arch rib. The two jacks are installed at the top of the temporary section lifting tower. One end of the two lifting cables is connected to the two jacks, and the other end is connected to the end of the temporary section arch rib.

5. According to claim 3, a basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system is characterized in that: The main beam temporary reinforcement mechanism comprises a temporary reinforcement beam string and a support rod, wherein the support rod is located directly below a predetermined position of the middle section lifting tower, and the support rod is connected to the temporary reinforcement beam string.

6. According to claim 4, a basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system is characterized in that: It also includes a horizontal steel cable, both ends of which are respectively connected to the outer ends of two adjacent arch ribs.

7. According to claim 5, a basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system is characterized in that: Both ends of the temporary reinforcement beam string are fixed on the bottom beam at the pier, and the middle part of the temporary reinforcement beam string is welded or bolted to the support rod.

8. According to claim 5, a basket-type steel arch bridge arch rib segmented outward expansion type cumulative integral lifting system is characterized in that: The support rod is a steel pipe or a steel section.

9. A basket-type steel arch bridge arch rib segmented outward expansion cumulative overall lifting method, using the basket-type steel arch bridge arch rib segmented outward expansion cumulative overall lifting system according to claim 5, characterized in that: The following steps are involved: Step 1) Lifting preparation: Complete the construction of permanent bridge piers and main beams, and use the main beam temporary reinforcement mechanism to temporarily reinforce the main beam; Step 2) Bridge deck assembly: according to the arch rib span, the arch rib is symmetrically divided into 2n+1 sections, where n is an integer of 2-10. The middle arch rib is first assembled in situ on the bridge deck, and then the middle arch rib lifting mechanism is installed; Step 3) lifting the middle arch rib: lift the middle arch rib evenly through the middle arch rib lifting mechanism until the end of the middle arch rib reaches the position of the upper end of the first group of adjacent arch ribs, assemble and connect the middle arch rib with the first group of adjacent arch ribs, and tension horizontal steel cables at the lower ends of the two first groups of adjacent arch ribs to control the arch rib position; Step 4) Lifting the first set of temporary arch ribs: first install a set of temporary arch rib lifting mechanisms, then remove the middle arch rib lifting mechanisms, and then use the temporary arch rib lifting mechanisms to evenly and integrally lift the connected middle arch ribs and the first set of temporary arch ribs until the lower end of the first set of temporary arch ribs reaches the position of the upper end of the second set of temporary arch ribs, assemble and connect the first set of temporary arch ribs with the second set of temporary arch ribs, and tension horizontal steel cables at the lower ends of the two temporary arch ribs of the second set of temporary arch ribs; Step 5) Lifting the second set of temporary arch ribs: first install another set of temporary arch rib lifting mechanism, then remove the previous set of temporary arch rib lifting mechanism, and then use the temporary arch rib lifting mechanism to evenly and integrally lift the first set of temporary arch ribs and the second set of temporary arch ribs until the lower end of the second set of temporary arch ribs reaches the position of the upper end of the third set of temporary arch ribs, assemble and connect the third set of temporary arch ribs with the second set of temporary arch ribs, and tension horizontal steel cables at the lower ends of the two temporary arch ribs of the second set of temporary arch ribs; Step 6) Repeat step 5) to lift the remaining groups of temporary arch ribs until the lower end of the last group of temporary arch ribs reaches the position of the upper end of the side arch ribs, and assemble and connect the last group of temporary arch ribs with the side arch ribs; Step 7) Overall fixation: fix the side arch ribs to the arch foot supports; then remove the horizontal steel cables, lifting towers, etc., and the overall lifting of the arch ribs is completed; finally, install the slings, remove the temporary reinforcement mechanism of the main beam, and the arch bridge construction is completed.

10. A basket-type steel arch bridge arch rib segmented outward expansion cumulative overall lifting method according to claim 9, characterized in that: Step 2) When the arch rib is symmetrically divided into 2n+1 sections according to the arch rib span, the horizontal span of the segmented arch rib is 60-90m.

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