A method for installing a whole set of backstay cables in the construction of a long-span arch bridge

Abstract

The application discloses a kind of whole bundle installation construction methods of buckling back cable in large-span arch bridge construction, comprising the following steps: S1, installation portal and construction platform;S2, installation back cable circulation lifting system and buckling cable circulation lifting system;S3, the corresponding whole bundle back cable of the i section arch rib segment is installed using back cable circulation lifting system and cable hoisting system;S4, hoist the i section arch rib segment by cable hoisting system, hoist in position and keep hoisting state;While installing buckling cable circulation traction system, the corresponding whole bundle buckling cable of the i section arch rib segment is installed using buckling cable circulation lifting system and buckling cable circulation traction system;S5, remove the hoisting state of the i section arch rib segment, while tensioning the back cable and buckling cable corresponding to the i section arch rib segment;S6, repeat steps S3 to S5, complete the buckling cable and back cable installation of the rest arch rib segment.The application avoids the collision and winding of steel strand in buckling back cable during transportation and installation process, reduces the construction risk, and improves the construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of construction technology for long-span arch bridges. More specifically, this invention relates to a method for installing the entire bundle of backstay cables during the construction of long-span arch bridges. Background Technology

[0002] Arch bridges are characterized by converting vertical loads into axial forces within the arch. Compared to beam bridges of the same span, they exhibit lower bending moments and shear forces, saving construction materials and increasing span capacity. Compared to cable-stayed bridges, they possess greater stiffness, stronger deformation resistance, and better applicability. Long-span arch bridges typically employ the cable-stayed method for cantilever assembly construction. The key construction step involves using a cable-stayed system to lift and transport arch rib segments section by section, while simultaneously using an anchor cable system to adjust and fix the arch segments. During the segmental lifting of the arch rib, the corresponding anchor cables and back cables are sequentially installed and tensioned to control the arch rib segment alignment to meet construction requirements. However, as the span of the arch bridge increases, the number of arch rib segments increases, as does the number of anchor cables and back cables. Each bundle of anchor cables and back cables consists of several steel strands. If the traditional method of installing anchor cables and back cables using single steel strands is employed, the construction time is long and the construction efficiency is low. Furthermore, collisions and entanglements between the cables are prone to occur, making installation difficult and posing high safety risks. Therefore, the smooth and efficient installation of the back-cable is a key construction procedure in the construction of arch bridge ribs, which has a vital impact on improving on-site construction efficiency and enhancing the construction safety of arch rib segments. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0004] To achieve these objectives and other advantages according to the present invention, a method for installing the entire bundle of backstay cables in the construction of a long-span arch bridge is provided, comprising the following steps:

[0005] S1. Install the gantry and construction platform at the top and bottom of the tower respectively;

[0006] S2. Install the back rope circulation lifting system and the buckle circulation lifting system;

[0007] S3. Install the entire bundle of back cables corresponding to the i-th arch rib segment using the back cable circulation lifting system and cable hoisting system;

[0008] S4. The i-th arch rib segment is hoisted using the cable hoisting system, and the i-th arch rib segment is kept in the hoisted state after being hoisted into place; at the same time, the zipper traction system is installed, and the zipper traction system and the zipper traction system are used to install the bundle of zippers corresponding to the i-th arch rib segment.

[0009] S5. Release the hoisting state of the i-th arch rib segment, and simultaneously tension the back cable and tie cable corresponding to the i-th arch rib segment;

[0010] S6. Repeat steps S3 to S5 to complete the installation of the ties and backslings for the remaining arch rib segments.

[0011] Preferably, the back-cable circulation lifting system and the buckle circulation lifting system have the same structure, both including a lifting wire rope, a tower base winch, a first tower base steering pulley, a second tower base steering pulley, and a tower top steering pulley; the tower base winch, the first tower base steering pulley, and the second tower base steering pulley are fixedly installed on the construction platform, and the tower top steering pulley is fixedly installed on the top of the buckle tower 3; one end of the lifting wire rope passes sequentially through the tower base winch, the first tower base steering pulley, the tower top steering pulley, and the second tower base steering pulley before returning to the tower base winch and connecting with the other end of the lifting wire rope to form a closed lifting circulation loop.

[0012] Preferably, step S3 specifically includes:

[0013] S31. Using the back cable circulation lifting system, the back cable corresponding to the i-th arch rib segment is lifted in its entirety, so that one end of the back cable is connected to the corresponding anchor point on the tower, and the other end is temporarily fixed to the top of the tower.

[0014] S32. Using the cable hoisting system, hoist one end of the back cable to the top of the tower, which is temporarily fixed, to the anchor point corresponding to the anchor.

[0015] Preferably, the cable-stayed traction system includes a load-bearing cable, idlers, an arch rib steering pulley, a tower top winch, and a traction wire rope. One end of the load-bearing cable is fixedly connected to the gantry, and the other end is fixedly connected to the i-th arch rib segment. Multiple idlers are spaced apart on the load-bearing cable. The tower top winch is fixedly installed on the top of the gantry, and the arch rib steering pulley is fixedly installed on the i-th arch rib segment. The traction wire rope is installed above the load-bearing cable, and one end of it passes sequentially through the tower top winch and the arch rib steering pulley before returning to the tower top winch and connecting to the other end of the traction wire rope to form a closed traction loop.

[0016] Preferably, the idler roller is connected to the load-bearing cable via a bracket; the load-bearing cable is provided as two cables; the top two sides of the bracket are respectively fixedly connected to the corresponding load-bearing cables; the top of the bracket is recessed downward to form a cavity with a top opening, and the two ends of the idler roller are rotatably connected to the inner wall of the lower end of the cavity.

[0017] Preferably, step S4 specifically includes:

[0018] S41. The i-th arch rib segment is hoisted using the cable hoisting system. After being hoisted into place, the i-th arch rib segment is kept in the hoisted state. At the same time, the zipper loop lifting system is used to install the zipper bundle corresponding to the i-th arch rib segment to one end, which is connected to the corresponding anchor point on the zipper tower, and the other end is temporarily fixed to the top of the zipper tower.

[0019] S42. Install the aforementioned cable circulation traction system;

[0020] S43. At the top of the tower, fix one end of the fastening cable from step S41 to the top of the tower to the traction wire rope. The traction wire rope pulls the fastening cable through the top of each of the idlers in sequence and reaches the anchor point on the i-th arch rib segment. During this process, the fastening cable is supported on each of the idlers.

[0021] S44. Loosen the load-bearing cable to disengage the buckle from each of the idler rollers, and then connect the buckle to the anchor point on the i-th arch rib segment.

[0022] Preferably, the cable hoisting system further includes an auxiliary hoisting system, through which the cable loop traction system is installed in step S4.

[0023] The present invention has at least the following beneficial effects:

[0024] This invention provides a method for the integrated installation of tie-back cables in the construction of long-span arch bridges. The method utilizes a cyclic lifting system for back cables, a cyclic lifting system for tie cables, and a cyclic traction system for tie cables to achieve integrated installation of tie cables and back cables. During back cable installation, since the cable hoisting system is not currently hoisting the arch rib segments, the back cables can be pulled by the cable hoisting system, and the pulling weight is sufficient for the integrated installation of the back cables. During tie cable installation, the cable hoisting system is simultaneously hoisting the arch rib segments; therefore, the cyclic traction system for tie cables is used to meet the integrated traction requirements of the tie cables. This method for integrated installation of tie-back cables in long-span arch bridge construction avoids collisions and entanglements of the steel strands in the tie cables or back cables during transportation and installation, reducing construction risks and improving construction efficiency. Furthermore, the cyclic lifting system for back cables, the cyclic lifting system for tie cables, and the cyclic traction system for tie cables can be reused for installing other arch rib segments, improving equipment utilization efficiency and saving construction equipment resources.

[0025] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0026] Figure 1 This is a side view of the buckle tower and the construction platform described in this invention;

[0027] Figure 2 This is a schematic diagram of the installation position of the back cable circulation lifting system described in this invention;

[0028] Figure 3 This is a schematic diagram showing the state of the back cable corresponding to the second arch rib segment after step S31 is completed in this invention.

[0029] Figure 4 This is a schematic diagram showing the state of the back cable corresponding to the second arch rib segment after step S32 is completed in this invention;

[0030] Figure 5 This is a schematic diagram of the installation position of the buckle circulation lifting system described in this invention;

[0031] Figure 6 This is a schematic diagram showing the state of the ties corresponding to the second arch rib segment after step S51 is completed in this invention;

[0032] Figure 7 This is a schematic diagram showing the state of the ties corresponding to the second arch rib segment after step S52 is completed in this invention;

[0033] Figure 8 This is a schematic diagram showing the state of the ties corresponding to the second arch rib segment after step S53 is completed in this invention;

[0034] Figure 9 This is a schematic diagram of the structure of the buckle circulation lifting system described in this invention;

[0035] Figure 10 This is a schematic diagram of the structure of the buckle loop traction system described in this invention;

[0036] Figure 11 This is a schematic diagram of the structure of the hanging bracket described in this invention; Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0038] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] likeFigures 1 to 11 As shown, this invention provides a method for installing the entire bundle of backstay cables during the construction of a long-span arch bridge, comprising the following steps:

[0040] S1. Install the gantry 6 and the construction platform 5 at the top and bottom of the tower 3 respectively;

[0041] S2. Install the back rope circulation lifting system 6 and the buckle circulation lifting system 9;

[0042] S3. Install the bundled backslings 79 corresponding to the i-th arch rib segment using the backsling circulation lifting system 6 and the cable hoisting system 13.

[0043] S4. The i-th arch rib segment is hoisted by the cable hoisting system 13 and kept in the hoisting state after being hoisted into place; at the same time, the zipper circulation traction system 11 is installed, and the zipper circulation lifting system 9 and the zipper circulation traction system 99 are used to install the bundle of zippers corresponding to the i-th arch rib segment.

[0044] S5. Release the hoisting state of the i-th arch rib segment, and simultaneously tension the back cable and tie cable corresponding to the i-th arch rib segment;

[0045] S6. Repeat steps S3 to S5 to complete the installation of the remaining arch rib segments.

[0046] In this technical solution, considering the large size and quantity of the cable-stayed cables and backing cables during the construction of long-span arch bridges, and the fact that each bundle of cable-stayed cables and backing cables consists of several steel strands, traditional cable-stayed cable-stayed cable installation methods are time-consuming, inefficient, difficult, and pose high safety risks. Therefore, this invention uses the backing cable circulation lifting system 6, the cable-stayed cable circulation lifting system 9, and the cable-stayed cable circulation traction system 11 to achieve the overall installation of the cable-stayed cables and backing cables, avoiding collisions and entanglements of the steel strands in the cable-stayed cables or backing cables during installation and transportation, reducing construction risks, and improving construction efficiency. The following example illustrates the method for the overall installation of cable-stayed cables and backing cables during the installation of the second arch rib segment of a long-span arch bridge. In the initial state, the arch seat 1, the first arch rib segment 2, the anchorages on the bank, and the cable-stayed towers 3 have been completed.

[0047] In step S1, such as Figure 1 As shown, a gantry 6 and a construction platform 5 are installed at the top and bottom of the tower 3, respectively;

[0048] In step S2, the back cable circulation lifting system 6 and the buckle circulation lifting system 9 are installed; the buckle circulation lifting system 9 can also be installed after the back cable 7 corresponding to the second arch rib segment 12 is installed, such as... Figure 2 As shown.

[0049] Reference Figure 9The back-cable circulation lifting system 6 and the buckle circulation lifting system 9 have the same structure, both including a lifting wire rope 17, a tower base winch 14, a first tower base steering pulley 15, a second tower base steering pulley 16, and a tower top steering pulley 18. One end of the lifting wire rope 17 passes sequentially through the tower base winch 14, the first tower base steering pulley 15, the tower top steering pulley 18, and the second tower base steering pulley 16 before returning to the tower base winch 14 and connecting with the other end of the lifting wire rope 17 to form a closed lifting circulation loop. The first tower base steering pulley 15, the second tower base steering pulley 16, and the tower top steering pulley 18 can be conventional fixed pulleys. The first tower base steering pulley 15 and the second tower base steering pulley 16 are fixedly installed on the construction platform 5, and the tower top steering pulley 18 is fixedly installed on the top of the buckle tower 3. The back cable circulation lifting system 6 and the buckle circulation lifting system 9 are respectively set on both sides of the buckle tower 3, corresponding to the installation positions of the back cable and the buckle.

[0050] Then, in step S3, the back cable 7 is installed using the back cable circulation lifting system 6, specifically including:

[0051] S31, such as Figure 3 As shown, the back cable circulation lifting system 6 is used to lift the back cable 7 corresponding to the second arch rib segment 12 in its entirety, so that one end of the back cable 7 is connected to the corresponding anchor point 31 on the tower 3, and the other end is temporarily fixed to the top of the tower 3. First, one end of the back cable 7 is fixed to the lifting wire rope 17 of the back cable circulation lifting system 6. Then, the tower bottom winch 14 is started to lift the end of the back cable 7 to the anchor point 31 for connection. Then, the other end of the back cable 7 is fixed to the lifting wire rope 17 and then lifted to the top of the tower 3 for temporary fixation.

[0052] S32, such as Figure 4 As shown, the cable hoisting system 13 is used to hoist one end of the back cable 7, which is temporarily fixed to the top of the tower 3, to the anchor point 8 corresponding to the anchor, thus completing the installation of the back cable 7.

[0053] If the cable loop lifting system 9 is not installed in step S2, it can be installed after step S32 is completed. Figure 5 As shown. Then, in step S4, while hoisting the second arch rib segment 12, the corresponding bundle of ties 10 is installed. Specifically, step S4 includes:

[0054] S41. The second arch rib segment 12 is hoisted using the cable hoisting system 13. After hoisting into place, the hook is not released, and the second arch rib segment 12 is kept in the hoisted state. At the same time, the cleaving cable circulation lifting system 9 is used to lift the cleaving cable 10 corresponding to the second arch rib segment 12 in a bundle, with one end connected to the corresponding anchor point 31 on the cleaving tower 3, and the other end temporarily fixed to the top of the cleaving tower 3. The hoisting process of the cleaving cable circulation lifting system 9 is the same as the hoisting process of the back cable circulation lifting system 6.

[0055] S52. Install the aforementioned cable loop traction system 11, such as Figure 6 As shown;

[0056] Reference Figure 10 The cable-stayed traction system 11 includes a load-bearing cable 20, idlers 21, an arch rib steering pulley 23, a tower top winch 19, and a traction wire rope 22. One end of the load-bearing cable 20 is fixedly connected to the gantry 4, and the other end is fixedly connected to the second arch rib segment 12. Multiple idlers 21 are spaced apart on the load-bearing cable 20. The traction wire rope 22 is positioned above the load-bearing cable 20, with one end passing sequentially through the tower top winch 19 and the arch rib steering pulley 23 before returning to the tower top winch 19 and connecting to the other end of the traction wire rope 22 to form a closed traction loop. The tower top winch 19 is fixedly mounted on the top of the tower 3. The arch rib steering pulley 23 can be a conventional fixed pulley, which is fixedly mounted on the second arch rib segment 12.

[0057] Furthermore, such as Figure 11 As shown, the idler roller 21 is connected to the load-bearing cable 20 via a bracket 24; the load-bearing cable 20 consists of two cables; the top two sides of the bracket 24 are fixedly connected to the corresponding load-bearing cables 20; the top of the bracket 24 is recessed downwards to form a cavity 241 with an open top, and the two ends of the idler roller 21 are rotatably connected to the lower inner wall of the cavity 241. The bracket 24 allows the traction steel wire rope 22 to easily pass the buckle 10 sequentially through each cavity 241, causing the buckle 10 to fall onto each idler roller 21, where it is supported by each idler roller 21. As an example, hanging rings can be fixedly installed at equal intervals on the load-bearing cable 20, and hooks can be installed on the top two sides of the bracket 24. Alternatively, the hooks can be directly hung on the corresponding load-bearing cable 20, and a limiting device can be used to prevent the bracket 24 from moving along the load-bearing cable 20.

[0058] S43, such as Figure 7As shown, at the top of the anchor tower 3, the end of the anchor cable 10 temporarily fixed to the top of the anchor tower 3 in step S4 is fixed to the traction steel wire rope 22. The traction steel wire rope 22 pulls the anchor cable 10 to pass over each of the idler rollers 21 in sequence and reach the anchor point on the second arch rib segment 12. During this process, the anchor cable 10 is supported on each of the idler rollers 21.

[0059] S44, such as Figure 8 As shown, the load-bearing cable 20 is loosened to disengage the buckle 10 from each of the idler rollers 21. Then, the buckle 10 is connected to the anchor point on the second arch rib segment 12, completing the installation of the buckle 10. After the load-bearing cable 20 is loosened, the buckle 10 can gradually detach from above each of the idler rollers 21 and separate from the load-bearing cable 20 from the top opening of each of the recesses 241.

[0060] Then, in step S5, the hoisting state of the second arch rib segment 12 is released, and the back cable 7 and the buckle cable 10 corresponding to the second arch rib segment 12 are tensioned simultaneously; steps S3 to S5 are repeated to complete the installation of buckles and back cables for the remaining arch rib segments. After installing the buckle cable circulation traction system 11 in the second arch rib segment, during the installation of buckles for the remaining arch rib segments, it is only necessary to reconnect the end of the load-bearing cable 20 connected to the second arch rib segment to the currently installed arch rib segment, and connect the traction wire rope 22 to the arch rib steering wheel on the currently installed arch rib segment.

[0061] During the installation of the aforementioned backstay cable, the backstay cable is installed before the arch rib segment is hoisted. Therefore, the hoisting of the backstay cable from the top of the anchor tower 3 to the anchor point on the anchor can also be carried out through the cable hoisting system. The cable hoisting system 13 can be a cable hoisting system conventionally used in arch bridge construction.

[0062] Furthermore, the cable hoisting system 13 also includes an auxiliary hoisting system. In step S42, the cable loop traction system 11 is installed via the auxiliary hoisting system. When installing the cable loop traction system 11, the cable hoisting system is used to hoist the arch rib segments; therefore, the auxiliary hoisting system is used to install the load-bearing cable 20 and the traction wire rope 22. The auxiliary hoisting system can be a small auxiliary hoisting system commonly used in cable hoisting systems, and its load-bearing capacity requirements are specified.

[0063] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for installing the entire bundle of backstay cables during the construction of a long-span arch bridge, characterized in that, Includes the following steps: S1. Install the gantry and construction platform at the top and bottom of the tower respectively; S2. Install the back rope circulation lifting system and the buckle circulation lifting system; S3. Install the entire bundle of back cables corresponding to the i-th arch rib segment using the back cable circulation lifting system and cable hoisting system; S4. The i-th arch rib segment is hoisted using the cable hoisting system, and the i-th arch rib segment is kept in the hoisted state after being hoisted into place; at the same time, the zipper traction system is installed, and the zipper traction system and the zipper traction system are used to install the bundle of zippers corresponding to the i-th arch rib segment. S5. Release the hoisting state of the i-th arch rib segment, and simultaneously tension the back cable and tie cable corresponding to the i-th arch rib segment; S6. Repeat steps S3 to S5 to complete the installation of the ties and backslings for the remaining arch rib segments. The back-cable circulating lifting system and the buckle circulating lifting system have the same structure, both including a lifting wire rope, a tower base winch, a first tower base steering pulley, a second tower base steering pulley, and a tower top steering pulley; the tower base winch, the first tower base steering pulley, and the second tower base steering pulley are fixedly installed on the construction platform, and the tower top steering pulley is fixedly installed on the top of the buckle tower; one end of the lifting wire rope passes sequentially through the tower base winch, the first tower base steering pulley, the tower top steering pulley, and the second tower base steering pulley before returning to the tower base winch and connecting with the other end of the lifting wire rope to form a closed lifting circulation loop; The cable-stayed traction system includes a load-bearing cable, idlers, an arch rib steering pulley, a tower top winch, and a traction wire rope. One end of the load-bearing cable is fixedly connected to the gantry frame, and the other end is fixedly connected to the i-th arch rib segment. Multiple idlers are spaced apart on the load-bearing cable. The tower top winch is fixedly installed on the top of the gantry frame, and the arch rib steering pulley is fixedly installed on the i-th arch rib segment. The traction wire rope is installed above the load-bearing cable, and one end passes sequentially through the tower top winch and the arch rib steering pulley before returning to the tower top winch and connecting to the other end of the traction wire rope to form a closed traction loop. The idlers are connected to the load-bearing cable via a bracket. There are two load-bearing cables. The top two sides of the bracket are fixedly connected to the corresponding load-bearing cables. The top of the bracket is recessed downward to form a cavity with an open top, and the two ends of the idlers are rotatably connected to the inner wall of the lower end of the cavity.

2. The construction method for installing the entire bundle of backstay cables in the construction of a long-span arch bridge as described in claim 1, characterized in that, Step S3 specifically includes: S31. Using the back cable circulation lifting system, the back cable corresponding to the i-th arch rib segment is lifted in its entirety, so that one end of the back cable is connected to the corresponding anchor point on the tower, and the other end is temporarily fixed to the top of the tower. S32. Using the cable hoisting system, hoist one end of the back cable to the top of the tower, which is temporarily fixed, to the anchor point corresponding to the anchor.

3. The construction method for installing the entire bundle of backstay cables in the construction of a long-span arch bridge as described in claim 1, characterized in that, Step S4 specifically includes: S41. The i-th arch rib segment is hoisted using the cable hoisting system. After being hoisted into place, the i-th arch rib segment is kept in the hoisted state. At the same time, the zipper loop lifting system is used to install the zipper bundle corresponding to the i-th arch rib segment to one end, which is connected to the corresponding anchor point on the zipper tower, and the other end is temporarily fixed to the top of the zipper tower. S42. Install the aforementioned cable circulation traction system; S43. At the top of the tower, fix one end of the fastening cable from step S41 to the top of the tower to the traction wire rope. The traction wire rope pulls the fastening cable through the top of each of the idlers in sequence and reaches the anchor point on the i-th arch rib segment. During this process, the fastening cable is supported on each of the idlers. S44. Loosen the load-bearing cable to disengage the buckle from each of the idler rollers, and then connect the buckle to the anchor point on the i-th arch rib segment.

4. The construction method for installing the entire bundle of backstay cables in the construction of a long-span arch bridge as described in claim 1, characterized in that, The cable hoisting system also includes an auxiliary hoisting system, in which the zipline traction system is installed in step S4.

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