Deck type arch bridge arch rib folding type vertical splicing reverse rotation installation tool and installation method

Abstract

The invention discloses a half-folding type vertical splicing reverse rotation mounting tool and method for a deck type arch bridge arch rib. The installation tool comprises a first wall-attached support installed on the bridge piers on the two sides, and the length of the first wall-attached support is matched with the arch shape of the first section; the second wall-attached support is installed on the first section, and the length of the second wall-attached support is matched with the arch shape of the second section; the hoisting mechanism is positioned on the approach bridge above the bridge pier and is used for hoisting the arch rib scattered splicing section to be spliced into a first section and a second section; the vertical rotating hinge is mounted at the joint of the first section and the second section; and the vertical rotating lifting mechanism comprises a cable bent tower, a buckling and hanging cable and an anchorage structure, the cable bent tower is detachably installed on the approach bridge above the bridge pier, one end of the buckling and hanging cable is anchored to a second section preset hanging point, and the other end of the buckling and hanging cable bypasses the top of the cable bent tower to be connected with the anchorage structure. According to the tool, the requirement for a construction site is low, the construction efficiency is high, arrangement of a temporary structure is reduced, and the construction cost and the construction difficulty can be reduced.

Description

Technical Field

[0001] The present invention generally relates to the technical field of bridge construction equipment, and in particular to a vertical assembly and reverse rotation installation tool for a top-supported arch bridge with folded arch ribs and an installation method. Background Art

[0002] As a classic bridge structure, deck arch bridges are widely used in mountain highways, landscape bridges, and long-span bridge projects due to their superior mechanical properties, aesthetic appearance, and wide span adaptability. Their structural characteristics are that the arch ring is positioned above the bridge deck, with the arch foot rigidly connected to the foundation to form a thrust system. This fully utilizes the compressive load-bearing strengths of concrete or steel structures, making them particularly suitable for crossing complex terrain such as deep valleys and rivers.

[0003] For top-decker arch bridges with steel box structures as the main arch, the more common construction methods include the inclined-stayed and buckled-hanging method and the rotational construction method. The inclined-stayed and buckled-hanging method requires a complex temporary buckling system, which is difficult to control construction precision and carries the risk of system conversion. The rotational construction method is complex in structural design and has strict requirements on site size. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a top-supported arch bridge arch rib folding vertical assembly reverse rotation installation tooling and installation method, which has low construction site requirements and high construction efficiency. Compared with the inclined buckle hanging method, it reduces the setting of temporary structures, which is conducive to reducing construction costs and construction difficulty.

[0005] In a first aspect, the present invention provides a tool for installing a folded, vertically assembled, reversely rotating arch rib of a deck arch bridge. The arch rib of the deck arch bridge includes a first section and a second section symmetrically arranged on two side piers. The first section and the second section each include a first segment and a second segment assembled in sequence. The first segment and the second segment each include at least two arch rib loosely assembled segments. The installation tool includes: A first wall attachment bracket is installed on the bridge piers on both sides, and the first wall attachment bracket extends in a direction away from the bridge piers, and the length of the first wall attachment bracket matches the arch shape of the first segment; a second wall-mounted bracket, mounted on the first segment and extending in a direction away from the first segment, wherein a length of the second wall-mounted bracket matches an arch shape of the second segment; The hoisting mechanism is located on the approach bridge above the pier and is used to hoist the arch rib segments to the pier to assemble the first and second segments. A vertical hinge is installed at the connection between the first segment and the second segment to enable the second segment to rotate in a vertical plane; The vertical lifting mechanism includes a cable tower, a hanging cable and an anchoring structure. The cable tower can be detachably installed on the approach bridge above the pier. One end of the hanging cable is anchored at the preset lifting point of the second section, and the other end passes around the top of the cable tower and is connected to the anchoring structure.

[0006] As an optional solution, there are two lifting mechanisms, each of which includes a crawler crane. The two crawler cranes are located on the approach bridge above the piers on both sides. The vertical rotation lifting mechanisms include two, and the two vertical rotation lifting mechanisms are respectively connected to the second segments symmetrically on both sides.

[0007] As an optional solution, the anchoring structure includes a winch and a rear anchor. The winch is used to provide power for retracting and releasing the lock, and the rear anchor is used to provide reaction force for the hook and shackle. The hook and shackle include a tension hook and a lifting hook.

[0008] In a second aspect, the present invention provides a method for installing a deck arch bridge arch rib in a folded, vertically assembled, reverse rotational manner, using the deck arch bridge arch rib folded, vertically assembled, reverse rotational manner installation tool of the first aspect, the installation method comprising: Install the first segment and the second segment on the piers on both sides respectively, so that the first segment and the second segment are folded in half, and install a vertical hinge between the first segment and the second segment; The second segments on both sides are lifted by the vertical lifting mechanism on the approach bridge above the piers on both sides, and each is rotated around the vertical hinge to a position corresponding to the first segment, and then welded and fixed to obtain the first segment and the second segment; The first and second sections of the cables on both sides are lowered to the position where the first and second sections are connected by means of the vertical lifting mechanism on the approach bridge above the piers on both sides, and then welded and fixed to obtain the arch ribs; Columns and box beams are installed above the arch ribs to obtain a top-supported arch bridge.

[0009] As an optional solution, the first and second segments are installed on the piers on both sides respectively, including: Install first wall attachment brackets on the piers on both sides respectively, and sequentially lift at least two arch rib assembled segments onto the first wall attachment brackets on the piers on both sides using a lifting mechanism to obtain a first segment; A second wall attachment bracket is installed on the first segment, and at least two arch rib assembled segments are sequentially hoisted onto the second wall attachment bracket by a hoisting mechanism to obtain a second segment.

[0010] As an optional solution, the second segments on both sides are lifted by vertical lifting mechanisms on the approach bridges above the piers on both sides, and each is rotated around the vertical hinge to a position where it contacts the first segment, including: Install cable towers on the approach bridges above the piers on both sides, install rear anchors on the approach bridges near the roadbed, install tie-down hooks and lifting hooks between the cable towers and the rear anchors, and hook one end of the tie-down hooks to the ends of the second segments on both sides; Start the winch and control the tensioning hook to make the second segments on both sides rotate around the vertical hinge to a horizontal position; Connect the lifting hook rope to the second segment, separate the tensioning hook rope from the end of the second segment, start the winch to control the lifting hook rope to lift the second segment to a position opposite to the first segment.

[0011] As an optional solution, the first and second sections of the cables on both sides are lowered to the position where the first and second sections are connected by means of the vertical lifting mechanism on the approach bridge above the piers on both sides, including: Remove the first wall bracket, start the winch to control the lifting buckle and release the rope, and lower the first and second sections to the position where the first and second sections are connected.

[0012] As an optional solution, the installation of columns and box beams above the arch ribs includes: Remove pylons, shackles and rear anchors; The columns and box beams are hoisted by the hoisting mechanism.

[0013] As an optional solution, before installing the first segment and the second segment on the piers on both sides respectively, the installation method further includes: Install bridge piers and approach bridges; Arch rib segments are assembled on the approach bridge to obtain arch rib loose segments.

[0014] In a third aspect, the present invention provides a top-supported arch bridge, which is obtained by the top-supported arch bridge arch rib folding vertical assembly and reverse rotation installation method according to the second aspect.

[0015] The present invention provides a top-supported arch bridge arch rib folding vertical assembly and reverse rotation installation tool, which completes the assembly of the first segment through the support of the first wall bracket, and completes the assembly of the second segment through the support of the second wall bracket. The vertical hinge between the first segment and the second segment is conducive to the horizontal rotation of the second segment. The lifting mechanism is used to lift the bulk segments of the arch rib to assemble the first segment and the second segment, which is conducive to reducing the requirements for the construction site. There is no need for a sports car to travel back and forth to lift the weight, and the assembly of the first segment and the second segment can be completed on the spot, which is conducive to improving the overall construction efficiency; the vertical lifting mechanism is used to drive the second segment to rotate around the vertical hinge to the position where it is connected with the first stage, and after the first segment and the second segment are connected to obtain the first segment and the second segment, it can also drive the first segment and the second segment to move to the position where the first segment and the second segment are connected to be connected, thereby obtaining a complete arch rib. Compared with the inclined-stayed buckle hanging method, the installation tool of the present invention does not require the installation of main cables and lifting systems, which reduces construction costs and construction difficulty. In addition, the segments on both sides are rotated vertically at the same time, which is beneficial to improving construction efficiency and construction progress. In addition, it has low requirements on the size of the construction site and can adapt to the construction of top-supported arch bridges with different spans and different terrain conditions. It is particularly beneficial for bridge construction in complex terrain environments such as mountainous areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 This is a schematic diagram of the pier and approach bridge structure in the method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 2 This is a schematic diagram of assembling the first segment in the method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 3 for Figure 2 A partial enlarged schematic diagram of P in the middle; Figure 4 This is a schematic structural diagram of the completed assembly of the first segment in the method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 5 This is a schematic diagram of the completed assembly of the second segment in the method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 6 A schematic diagram of the second segment of the tension buckle and hanging cable in the method for installing the folded vertical assembly and reverse rotation of the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 7 This is a schematic diagram of a deck arch bridge with the second segment in a horizontal position in a method for vertically assembling and reversely rotating the arch ribs in half according to an embodiment of the present application; Figure 8A schematic diagram of a lifting hook and hanging cable connected to the second segment in a method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 9 This is a schematic diagram of the first and second segments after being joined in the method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 10 This is a schematic diagram of the first and second sections after they are joined in the method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 11 Schematic diagram of the column and box girder structure in the method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge in an embodiment of the present application; Figure 12 This is a schematic diagram of the arch ribs of a top-decker arch bridge obtained by the method for installing the arch ribs of the top-decker arch bridge in a folded, vertical, and reverse rotation manner in an embodiment of the present application.

[0017] In the figure, 100. Arch rib of a deck arch bridge; 10, first section, 20, second section, B1, first segment, B2, second segment, C1, arch rib assembly section, A1, pier, A2, approach bridge; 1. First wall-attached bracket, 2. Second wall-attached bracket, 3. Crawler crane, 4. Cable tower, 5. Anchor structure, 61. Tension buckle hanging cable, 62. Lifting buckle hanging cable, 7. Vertical hinge, 8. Column, 9. Box girder. DETAILED DESCRIPTION

[0018] The present application will be further described in detail below with reference to the embodiments. It will be understood that the specific embodiments described herein are intended only to explain the relevant invention and are not intended to limit the invention. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present application will be described in detail below with reference to the embodiments.

[0019] The embodiment of the present application provides a top-mounted arch bridge arch rib folding vertical assembly reverse rotation installation tool, such as Figure 1-12 As shown, the arch rib 100 of the deck arch bridge includes a first section 10 and a second section 20 symmetrically arranged on the piers A1 on both sides. The first section 10 and the second section 20 each include a first segment B1 and a second segment B2 assembled in sequence. The first segment B1 and the second segment B2 each include at least two arch rib loose segments C1. The installation tool includes: The first wall attachment bracket 1 is installed on the bridge piers A1 on both sides, and the first wall attachment bracket 1 extends in a direction away from the bridge pier A1. The length of the first wall attachment bracket 1 matches the arch shape of the first segment B1. The second wall-mounted bracket 2 is mounted on the first segment B1 and extends in a direction away from the first segment B1. The length of the second wall-mounted bracket 2 matches the arch shape of the second segment B2. The hoisting mechanism is located on the approach bridge A2 above the pier A1 and is used to hoist the arch rib segment C1 to the pier A1 to assemble the first segment B1 and the second segment B2; A vertical hinge 7 is installed at the connection between the first segment B1 and the second segment B2 to enable the second segment B2 to rotate in a vertical plane; The vertical lifting mechanism includes a cable tower 4, a hook and a mooring structure 5. The cable tower 4 can be detachably installed on the approach bridge A2 above the pier A1. One end of the hook and mooring cable is anchored at the preset lifting point of the second section B2, and the other end passes around the top of the cable tower 4 and is connected to the mooring structure 5.

[0020] It should be noted that the arch ribs of the top-supported arch bridge are generally assumed to span a deep valley or a river, and piers A1 are set on the two opposite banks of the deep valley or the river to support the arch ribs. A symmetrical construction method can be adopted in the actual construction process. Therefore, the arch ribs of the top-supported arch bridge in the embodiment of the present application include a first section 10 and a second section 20 symmetrically arranged on the piers A1 on the two opposite banks. The first section 10 and the second section 20 are symmetrical structures. The first section 10 and the second section 20 each include a first segment B1 and a second segment B2. The first segment B1 and the second segment B2 are each assembled from a plurality of arch rib segments C1, and the arch rib segments C1 are assembled from arch rib segments.

[0021] Among them, the first wall-attached bracket 1 is installed vertically on the side of the pier A1, and is used to support the arch rib scattered segment C1; the first wall-attached bracket 1 includes multiple, multiple first wall-attached brackets 1 are spaced apart from the bottom of the pier A1 upward, and the length of each first wall-attached bracket 1 matches the arch shape of the first segment B1, thereby ensuring that the first segment B1 can be reliably assembled; similarly, the second wall-attached bracket 2 is installed on the first segment B1, and the second wall-attached bracket 2 includes multiple, multiple second wall-attached brackets 2 are spaced apart from the bottom of the first segment B1 upward, and the length of each second wall-attached bracket 2 matches the second segment B2, for reliably realizing the assembly of the second segment B2.

[0022] The lifting mechanism can be any type of lifting mechanism, such as but not limited to a crawler crane 3; the lifting mechanism is used to lift the bulk segments of the arch ribs assembled on the approach bridge A2 above the pier A1 to the first wall bracket 1 and the second wall bracket 2 on the side of the pier A1 to obtain the first segment B1 and the second segment B2.

[0023] The vertical lifting mechanism is mainly used to drive the second segment B2 to rotate around the vertical hinge 7 in the vertical plane to realize the connection of the first segment B1 and the second segment B2. The vertical lifting mechanism is also used to obtain the first section 10 and the second section 20 after the first segment B1 and the second segment B2 are connected, and drive the first section 10 and the second section 20 to move downward, so that the first section 10 and the second section 20 are connected to obtain a complete arch rib.

[0024] Among them, the cable tower 4 mainly serves as a temporary tower structure and as a support point for the hanging rope; the hanging rope can generally be a high-strength steel cable (wire rope or steel strand), one end of which is anchored at the preset hanging points of the second segment B2 and the first segment B1, and the other end passes around the top of the cable tower 4 and is connected to the anchor structure 5; the anchor structure 5 serves as a structure that provides reaction force for the hanging rope, and includes a winch system for retracting and releasing the rope.

[0025] The embodiment of the present application provides a vertically assembled and reversely rotated installation tool for the folded arch ribs of the upper-supported arch bridge, which solves the problems of high difficulty in controlling construction accuracy, system conversion risks, and high requirements for the construction site in traditional construction methods. In the embodiment of the present application, the assembly of the first segment B1 is completed by the support of the first wall-attached bracket 1, and the assembly of the second segment B2 is completed by the support of the second wall-attached bracket 2. The vertical hinge 7 between the first segment B1 and the second segment B2 is conducive to the horizontal rotation of the second segment B2. The lifting mechanism is used to lift the bulk segments of the arch rib to assemble the first segment B1 and the second segment B2, which is conducive to reducing the requirements for the construction site. There is no need for a sports car to travel back and forth to lift the weight. The assembly of the first segment B1 and the second segment B2 can be completed on the spot, which is conducive to improving the overall construction efficiency; the vertical lifting mechanism is used to drive the second segment B2 to rotate around the vertical hinge 7 to the position where it is connected with the first stage, and after the first segment B1 and the second segment B2 are connected to obtain the first segment 10 and the second segment 20, it can also drive the first segment 10 and the second segment 20 to move to the position where the first segment 10 and the second segment 20 are connected to be connected, thereby obtaining a complete arch rib. Compared with the inclined-stayed buckle hanging method, the installation tooling of the embodiment of the present application does not require the installation of main cables and lifting systems, which reduces construction costs and construction difficulty, and the segments on both sides are rotated vertically at the same time, which is beneficial to improving construction efficiency and construction progress; and it has low requirements on the size of the construction site, and can adapt to the construction of top-supported arch bridges with different spans and different terrain conditions, which is particularly beneficial for bridge construction in complex terrain environments such as mountainous areas.

[0026] In some embodiments, there are two hoisting mechanisms, each of which includes a crawler crane 3 , and the two crawler cranes 3 are respectively located on the approach bridge A2 above the piers A1 on both sides; The vertical rotation and lifting mechanisms include two, and the two vertical rotation and lifting mechanisms are respectively connected to the second segments B2 symmetrically on both sides.

[0027] This embodiment is conducive to simultaneous construction on both sides of the opposite bank, thereby improving construction efficiency.

[0028] In some embodiments, the anchoring structure 5 includes a winch and a rear anchor. The winch is used to provide power for retracting and releasing the lock, and the rear anchor is used to provide a reaction force for the hook rope. The hook rope includes a tension hook rope 61 and a lifting hook rope 62.

[0029] This embodiment is conducive to ensuring that the second segment B2 is reliably driven to rotate in the vertical plane to the position where it merges with the first segment 10, and at the same time, the first segment 10 and the second segment 20 can be controlled to slowly descend to the position where the first segment 10 and the second segment 20 merge.

[0030] In a second aspect, an embodiment of the present application provides a method for installing a deck arch bridge with arch ribs folded in half, vertically assembled, and reversely rotated, using the deck arch bridge arch rib folded in half, vertically assembled, and reversely rotated installation tooling of the first aspect. The installation method includes: Step S10: Figure 2 and Figure 5 As shown, the first segment B1 and the second segment B2 are respectively installed on the piers A1 on both sides, so that the first segment B1 and the second segment B2 are folded in half, and a vertical hinge 7 is installed between the first segment B1 and the second segment B2; Step S20: Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, the second segments B2 on both sides are lifted by the vertical lifting mechanism on the approach bridge A2 above the piers A1 on both sides, and each is rotated around the vertical hinge 7 to a position corresponding to the first segment B1, and then welded and fixed to obtain the first segment 10 and the second segment 20; Step S30: Figure 10 As shown, the first section 10 and the second section 20 on both sides are lowered to the position where the first section 10 and the second section 20 are connected by the vertical lifting mechanism on the approach bridge A2 above the piers A1 on both sides, and then welded and fixed to obtain the arch rib; Step S40: Figure 11 and Figure 12 As shown, columns 8 and box beams 9 are installed above the arch ribs to obtain an upper-bearing arch bridge.

[0031] Compared to the inclined-stayed buckle-hanging method, the installation method of the embodiment of the present application does not require the installation of main cables and a lifting system, thus reducing construction costs and difficulty. Compared to the conventional rotation construction method, the installation site size requirement is relatively low, and construction work can still be carried out relatively smoothly even when the site is limited. This is particularly beneficial for bridge construction in complex terrain environments such as mountainous areas. Arch rib assembly does not require a cable crane lifting system, and there is no need for a sports car to travel back and forth to lift the load. The arch rib assembly can be completed by simply lifting it on the spot with a crawler crane, thereby improving overall construction efficiency. The vertical rotation of the arch ribs on both sides is carried out simultaneously, accelerating the construction progress. The method is suitable for the construction of top-mounted arch bridges with different spans and different terrain conditions. Whether crossing a deep valley or a river, the arch rib installation work can be completed well.

[0032] In some embodiments, step S10, respectively installing the first segment B1 and the second segment B2 on the piers A1 on both sides, includes: Install first attachment brackets 1 on the piers A1 on both sides respectively, and sequentially lift at least two arch rib assembled segments C1 onto the first attachment brackets 1 on the piers A1 on both sides using a lifting mechanism to obtain a first segment B1; like Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, a second wall attachment bracket 2 is installed on the first segment B1, and at least two arch rib assembled segments C1 are sequentially hoisted onto the second wall attachment bracket 2 by a hoisting mechanism to obtain a second segment B2.

[0033] It is understandable that the bulk segments of the arch ribs are pre-assembled on the approach bridge A2, which reduces the requirements for the assembly site. The bulk segments of the arch ribs C1 are hoisted by a hoisting mechanism to assemble the first segment B1 and the second segment B2, which reduces the welding work in the river and reduces the difficulty of construction in the river.

[0034] In some embodiments, step S20, wherein the second segments B2 on both sides are lifted by the vertical lifting mechanism on the approach bridge A2 above the piers A1 on both sides, and each of the second segments B2 is rotated around the vertical hinge 7 to a position where the second segments B2 are connected to the first segment B1, includes: like Figure 6 As shown, a cable tower 4 is installed on the approach bridge A2 above the pier A1 on both sides, a rear anchor is installed on the approach bridge A2 near the roadbed side, a tie hook 61 and a lifting hook 62 are installed between the cable tower 4 and the rear anchor, and one end of the tie hook 61 is hooked to the end of the second segment B2 on both sides; like Figure 7 As shown, the winch is started to control the pull-buckle rope 61 so that the second segments B2 on both sides are rotated around the vertical hinge 7 to a horizontal position; like Figure 8As shown, the lifting hook 62 is connected to the second segment B2, the pull hook 61 and the end of the second segment B2 are separated, and the winch is started to control the lifting hook 62 to lift the second segment B2 to a position opposite to the first segment B1.

[0035] Among them, the pulling buckle rope 61 is connected to the end of the second segment B2, and is used to pull the second segments B2 on both sides to a horizontal state. At this time, the second segment B2 needs to be further lifted to the position where it is connected to the first segment B1, and the position of the buckle rope on the second segment B2 needs to be adjusted. Therefore, the pulling buckle rope 62 is connected to the second segment B2 at intervals by lifting it, and the pulling buckle rope 61 at the end of the second segment B2 is removed, which is conducive to the stable and reliable lifting of the second segment B2 to the position where it is connected to the first segment B1.

[0036] In this embodiment, by first lifting the second segment B2 to a horizontal state, and then adjusting the position of the lifting hook 62 to continue lifting the second segment B2, it is beneficial to improve the safety and reliability of the construction and reduce the power demand of the winch.

[0037] In some embodiments, step S30, using the vertical lifting mechanism on the approach bridge A2 above the piers A1 on both sides to lower the first section 10 and the second section 20 on both sides to a position where the first section 10 and the second section 20 are connected, includes: The first wall attachment bracket 1 is removed, and the winch is started to control the lifting hook 62 to release the rope, and the first section 10 and the second section 20 are lowered to the position where the first section 10 and the second section 20 are connected.

[0038] In this embodiment, after the first segment B1 and the second segment B2 are joined together, the first section 10 and the second section 20 are lowered as a whole, which is conducive to reducing the construction difficulty and improving the construction safety.

[0039] In some embodiments, step S40, installing the columns 8 and the box beam 9 above the arch ribs, includes: Remove tower 4, slings and anchor structures; The columns 8 and the box beam 9 are hoisted by the hoisting mechanism.

[0040] As an achievable approach, before step S10, respectively installing the first segment B1 and the second segment B2 on the piers A1 on both sides, the installation method further includes: like Figure 1 As shown, the bridge pier A1 and the approach bridge A2 are installed; The arch rib segments are assembled on the approach bridge A2 to obtain the arch rib segment C1.

[0041] It is understandable that the length of the approach bridge A2 and the number of piers A1 are determined based on actual load-bearing requirements. Piers A1 and approach bridge A2 are installed on both sides of the opposite bank. After the approach bridge A2 is installed, arch rib segments are assembled on the approach bridge A2 to obtain arch rib segments C1.

[0042] In summary, the method for vertically assembling and reversely rotating arch ribs for a deck arch bridge according to the embodiments of this application involves secondary segmentation of the arch ribs to be rotated vertically, namely, dividing the arch ribs into four large segments in the mileage direction. Because these arch rib segments are heavy, they cannot be hoisted directly above the approach bridge A2. Therefore, these four large segments are further divided into several loose arch rib segments C1. The loose arch rib segments C1 are assembled above the approach bridge A2, while the arch ribs of the two vertically rotating segments (the first segment 10 and the second segment 20) are assembled symmetrically above the approach bridges A2 on either side.

[0043] After the arch rib segments C1 are assembled above the approach bridge A2, crawler cranes 3 sequentially hoist the arch rib segments C1, lifting them from above the approach bridge A2 and lowering them to the abutment of pier A1. First wall attachment brackets 1 are installed between the arch rib segments C1 and the embedded pier components to temporarily secure the segments C1. The segments C1 are then assembled into quarter-section arch rib segments (i.e., the first segment B1). After the first segment B1 is assembled, the second arch rib segment B2 is assembled. The construction sequence and principle are identical. The two main piers undergo the same work until all four arch rib segments are fully assembled. Subsequently, cable towers 4, rigging cables, and anchors (including a winch system) are installed above the main piers. Using the diagonal rigging cables and the winch's retractable cables, the second segment B2 is first vertically rotated upward to align with the arch rib of the first segment B1. Once the alignment is complete, the first and second segments 10, 20 are then vertically rotated downward as a whole. Construction is symmetrical on both sides of the bridge, completing the arch rib closure.

[0044] In a third aspect, embodiments of the present application provide a deck arch bridge constructed using the method for vertically assembling and rotating a deck arch bridge using folded arch ribs in half. It will be appreciated that this deck arch bridge possesses all the features and advantages of the method for vertically assembling and rotating a deck arch bridge using folded arch ribs in half. In short, this deck arch bridge offers the advantages of low construction difficulty, high efficiency, and high safety.

[0045] The following describes a method for vertically assembling and reversely rotating the folded arch ribs of a deck arch bridge according to the present invention through specific embodiments.

[0046] Step 1: like Figure 1 As shown, the bridge pier A1 and the approach bridges A2 on both sides are under construction; Step 2: like Figure 2 、 Figure 3 and Figure 4As shown, the first wall-attached bracket 1 is installed on the piers A1 on both sides in advance, and two crawler cranes 3 are used to sequentially hoist the arch rib segments C1 above the approach bridges A2 on both sides, and assemble the segments vertically from bottom to top. Step 3: The first segment B1 on both sides is assembled; Step 4: (1) If Figure 5 As shown, the second wall-mounted bracket 2 is installed on the first segment B1, and the second segment B2 is assembled. The arch rib of the second segment B2 is folded in half with the arch rib of the first segment B1. (2) Install vertical hinges 7 at the connection positions of the first segment B1 and the second segment B2 for subsequent vertical rotation; Step 5: (1) If Figure 6 As shown, the first segment B1 and the second segment B2 are assembled, and the crawler crane 3 exits the site; (2) Install cable towers 4 on the approach bridges A2 above the piers A1 on both sides, install rear anchors on the approach bridges A2 near the roadbed, and install tensioning hooks 61 and lifting hooks 62; (3) Hook the tension hook 61 on the end of the second segment B2 respectively to ensure that the tension hook 61 can be hooked smoothly; Step 6: like Figure 7 As shown, the winch is started to pull the two side buckle ropes 61 to rotate the second segment B2 around its respective vertical hinge 7 to a horizontal state; Step 7: like Figure 8 As shown, the lifting buckle lanyard 62 is used to hook the second segment B2 on each side, and after being fixed, the pulling buckle lanyard 61 is removed; Step 8: like Figure 9 As shown, the cable towers 4 on the approach bridge A2 above the piers A1 on both sides retract their respective cables, and continue to pull up the second segments B2 connected to them, connect them with the arch ribs of the first segment B1, and weld them together; Step 9: like Figure 10 As shown, the connection between the first segment B1 and the first wall bracket 1 is released, the cable tower 4 is slowly lowered, and the first segment 10 and the second segment 20 on both sides are vertically rotated and connected, and the joint is completed; Step 10: like Figure 11 The crawler crane 3 goes on the bridge and sequentially hoists the columns 8 above the arch ribs and installs the box beam 9 segments.

[0047] Step 11: like Figure 12As shown, the remaining columns 8 and box beams 9 are installed, and the arch bridge construction is completed.

[0048] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A tool for vertically assembling and reversely rotating the arch ribs of a deck arch bridge, characterized in that: The arch rib of the deck arch bridge includes a first section and a second section symmetrically arranged on the piers on both sides, each of the first section and the second section includes a first segment and a second segment assembled in sequence, each of the first segment and the second segment includes at least two arch rib segments assembled separately, and the installation tool includes: a first wall attachment bracket, mounted on the bridge piers on both sides, and extending in a direction away from the bridge piers, wherein the length of the first wall attachment bracket matches the arch shape of the first segment; a second wall-mounted bracket, mounted on the first segment and extending in a direction away from the first segment, wherein a length of the second wall-mounted bracket matches an arch shape of the second segment; a hoisting mechanism, located on the approach bridge above the pier, for hoisting the arch rib assembled segments to the pier to assemble the first segment and the second segment; a vertical hinge, installed at the connection between the first segment and the second segment, so that the second segment can rotate in a vertical plane; A vertical lifting mechanism includes a cable tower, a hook and an anchor structure. The cable tower can be detachably installed on the approach bridge above the pier. One end of the hook is anchored at a preset lifting point of the second segment, and the other end passes around the top of the cable tower and is connected to the anchor structure.

2. The vertical assembly and reverse rotation installation tool for the folded arch ribs of a deck arch bridge according to claim 1 is characterized in that: The hoisting mechanisms include two, each of which includes a crawler crane, and the two crawler cranes are respectively located on the approach bridge above the bridge piers on both sides; The two vertical rotation and lifting mechanisms are respectively connected to the second segments symmetrically on both sides.

3. The vertical assembly and reverse rotation installation tool for the folded arch ribs of a deck arch bridge according to claim 1 is characterized in that: The anchoring structure includes a winch and a rear anchor, the winch is used to provide power for retracting and releasing the lock, and the rear anchor is used to provide a reaction force for the hook rope, and the hook rope includes a pull hook rope and a lifting hook rope.

4. A method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge, characterized in that: Utilizing the vertical assembly and reverse rotation installation tooling for the folded arch ribs of a deck arch bridge according to any one of claims 1 to 3, the installation method comprises: Installing the first segment and the second segment on the piers on both sides respectively, so that the first segment and the second segment are folded in half, and installing a vertical hinge between the first segment and the second segment; The second segments on both sides are lifted by the vertical lifting mechanism on the approach bridge above the piers on both sides, and each is rotated around the vertical hinge to a position corresponding to the first segment, and then welded and fixed to obtain the first segment and the second segment; The first and second sections of the cables on both sides are lowered to a position where the first and second sections are joined by welding them together to obtain an arch rib by using the vertical lifting mechanism on the approach bridge above the piers on both sides; Columns and box beams are installed above the arch ribs to obtain a top-supported arch bridge.

5. The method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge according to claim 4 is characterized in that: Install the first and second segments on the piers on both sides respectively, including: The first attachment brackets are respectively installed on the piers on both sides, and the at least two arch rib assembled segments are sequentially hoisted onto the first attachment brackets on the piers on both sides by the hoisting mechanism to obtain a first segment; The second wall attachment bracket is installed on the first segment, and the at least two arch rib assembled segments are sequentially hoisted onto the second wall attachment bracket by the hoisting mechanism to obtain a second segment.

6. The method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge according to claim 4 is characterized in that: The method comprises: lifting the second segments on both sides by the vertical rotation lifting mechanism on the approach bridge above the piers on both sides, and rotating each of the second segments around the vertical rotation hinge to a position where the second segments are connected to the first segments. The cable towers are respectively installed on the approach bridges above the piers on both sides, the rear anchor is installed on the approach bridge near the roadbed side, the tie-hook lanyard and the lifting lanyard are installed between the cable towers and the rear anchor, and one end of the tie-hook lanyard is respectively hooked to the end of the second segment on both sides; Starting the hoist and controlling the pull-buckle rigging to rotate the second segments on both sides around the vertical hinge to a horizontal position; The lifting buckle rope is connected to the second segment, the pulling buckle rope is separated from the end of the second segment, and the winch is started to control the lifting buckle rope to lift the second segment to a position opposite to the first segment.

7. The method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge according to claim 6, characterized in that: The method comprises: lowering the first and second sections of the cables on both sides to a position where the first and second sections are connected by the vertical lifting mechanism on the approach bridge above the piers on both sides; The first wall-attached bracket is removed, and the winch is started to control the lifting buckle to release the rope, and the first section and the second section are lowered to the position where the first section and the second section are connected.

8. The method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge according to claim 6, characterized in that: Installing columns and box beams above the arch ribs includes: removing the pylon, the shackle and the rear anchor; The columns and the box beams are hoisted by the hoisting mechanism.

9. The method for vertically assembling and reversely rotating the arch ribs of a deck arch bridge according to claim 6, characterized in that: Before respectively installing the first segment and the second segment on the piers on both sides, the installation method further includes: Install bridge piers and approach bridges; The arch rib segments are assembled on the approach bridge to obtain the arch rib loose segments.

10. A deck arch bridge, characterized in that: The top-supported arch bridge is obtained by the top-supported arch bridge arch rib folding vertical assembly and reverse rotation installation method described in any one of claims 4 to 9.

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