A beam splitting installation method for high-position long-distance horizontal cables suitable for arch rib lifting

Abstract

The present invention discloses a method for installing a high-position long-distance horizontal cable beam splitting for arch rib lifting, belonging to the technical field of bridge construction, including devices such as a construction platform, a vertical traction winch, a horizontal transmission winch, a fixed pulley, a traction rope, a U-shaped bayonet, etc.; the specific method is to set up a construction platform at the anchoring position of the horizontal cable steel strands at both ends of the arch rib. A vertical traction winch is installed on one side of the construction platform to traction a single horizontal cable steel strand from the ground to the working platform. A horizontal transmission cable device is installed between the construction platforms to transmit the horizontal cable steel strands and anchor them at both ends of the arch rib. The above steps are repeated in sequence until all the horizontal cable steel strands are installed in place. Through the above method, the structure of the present invention is simple, easy to process and manufacture, can be quickly manufactured according to the site conditions, and is convenient to operate, with strong practicability, and can be applied to the installation of horizontal cable steel strands, shortening the time cost, mechanical cost, material cost and labor cost.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to a method for split-beam installation of high-position and long-distance horizontal cables suitable for arch rib lifting. Background Art

[0002] In the construction of modern long-span arch bridges, arch rib lifting construction is a key link. To ensure the structural stability of the arch rib during the lifting process, tensioning and pre-tightening the arch rib with horizontal cables is an essential process. With the development of bridge construction technology, more and more bridge projects need to cross complex terrains and water areas. For example, in bridge construction projects crossing the Yellow River channel, the arch rib is often at a high altitude, and the water flow in the underlying river channel is complex and the traffic is busy, resulting in difficulties in carrying out traditional horizontal cable hoisting operations.

[0003] Currently, in engineering, the method of erecting a full-length temporary operation platform outside the upper chord members is often used for the deployment and installation operations of horizontal cables.

[0004] However, this temporary operation platform has many drawbacks;

[0005] First: In terms of construction efficiency, the erection and disassembly of the temporary operation platform both require a large amount of time and manpower, greatly extending the overall construction period;

[0006] Second: From a safety perspective, the operations of erecting, using, and disassembling the platform in a high-altitude environment not only increase the work intensity of construction workers but also face multiple safety risks such as high-altitude falls and object strikes. Once an accident occurs, the consequences will be unimaginable.

[0007] Based on this, the present invention designs a method for split-beam installation of high-position and long-distance horizontal cables suitable for arch rib lifting to solve the above problems. Summary of the Invention

[0008] In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for split-beam installation of high-position and long-distance horizontal cables suitable for arch rib lifting.

[0009] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0010] A method for split-beam installation of high-position and long-distance horizontal cables suitable for arch rib lifting, comprising the following steps:

[0011] Step 1: Weld the construction platform to the main body of the bridge in cooperation with the position of the arch rib;

[0012] Step 2: There are two sets of construction platforms, which are respectively arranged on the left and right sides of the main bridge body. A vertical traction winch is installed on the left construction platform. Set the total number of horizontal cable steel strands to be installed. The vertical traction winch pulls one end of a single horizontal cable steel strand to the left construction platform;

[0013] Step 3: The construction platforms on the left and right sides are connected by a transmission cable device;

[0014] Step 4: The end of a single horizontal cable steel strand is connected to the transmission cable device through a U-shaped bayonet. The transmission cable device thus drives the horizontal cable steel strand to move, so that the horizontal cable steel strand is transmitted from the left side of the arch rib to the right side;

[0015] Step 5: Repeat the above Step 4 until all the horizontal cable steel strands are anchored on both sides of the arch rib.

[0016] Furthermore, the construction platform includes channel steel, I-beam and steel plate. There are multiple channel steels, all of which are fixedly connected to the I-beam. The upper end of the I-beam is fixedly connected to the steel plate. The steel plate is connected to the transmission cable device. The upper end of the left steel plate is fixedly connected to the vertical traction winch. The I-beam is welded to the main bridge body.

[0017] Furthermore, the thickness of the steel plate is 5 mm.

[0018] Furthermore, the main bridge body includes a steel beam, lifting tower frames and brackets. The steel beam is an integral framework composed of multiple steel frames welded together. There are two lifting tower frames, which are respectively fixedly installed on the left and right sides of the upper end of the steel beam. There are multiple brackets, all of which are fixedly installed on the upper end of the steel beam. The brackets are installed at the lower end of the arch rib to support the arch rib. The I-beam is welded to the lifting tower frame.

[0019] Furthermore, the welding method of the I-beam and the lifting tower frame adopts double-sided welding or single-sided welding.

[0020] Furthermore, the transmission cable device includes a horizontal transmission winch, a fixed pulley and a traction rope. The traction rope is wound around the drum of the horizontal transmission winch for N circles, and the traction rope is sleeved on the outer end of the fixed pulley.

[0021] Furthermore, N is 5.

[0022] Furthermore, the upper end of the left steel plate is fixedly connected to the lower end of the fixed pulley, and the upper end of the right steel plate is fixedly connected to the horizontal transmission winch.

[0023] The beneficial effects of the present invention compared with the prior art are as follows: 1. Improve construction efficiency: By reasonably building the construction platform and arranging the equipment, and adopting the mechanical traction and transmission method, the amount of manual operation is reduced, and the installation speed of the horizontal cable steel strands is increased. Compared with the traditional method, the construction efficiency is improved;

[0024] 2. Ensure installation accuracy: By using the fixed pulley and the precisely controlled winch rotation, the position accuracy of the steel strands during the transmission process can be effectively ensured, the installation error is reduced, and the installation accuracy of the horizontal cable steel strands meets higher engineering requirements;

[0025] 3. Reduce safety risks: Most of the operations are carried out on the built construction platform, reducing the direct operation time and intensity of workers at high altitudes, reducing the safety risks brought by high-altitude operations, and effectively protecting the lives of construction workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Schematic diagram of the completed installation of the horizontal cable steel strands of the present invention;

[0028] Figure 2 Schematic diagram of the construction of the installation of the horizontal cable steel strands of the present invention;

[0029] Figure 3 Front view of the construction platform for the construction of the installation of the horizontal cable steel strands of the present invention;

[0030] Figure 4 Cross-section of the construction platform for the construction of the installation of the horizontal cable steel strands of the present invention Figure 1 ;

[0031] Figure 5 Cross-section of the construction platform for the construction of the installation of the horizontal cable steel strands of the present invention Figure 2 。

[0032] The reference numerals in the drawings respectively represent:

[0033] 1. Arch rib; 2. Vertical traction winch; 3. Construction platform; 31. Channel steel; 32. I-beam; 33. Steel plate; 4. Transmission cable device; 41. Horizontal transmission winch; 42. Fixed pulley; 43. Traction rope; 5. Horizontal cable steel strand; 6. U-shaped buckle; 7. Main body of the bridge; 71. Steel beam; 72. Lifting tower; 73. Bracket. Detailed implementation mode

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0035] The "left", "right", "front", "rear", "upper" and "lower" mentioned in the following description are oriented in the perspective direction of the front view.

[0036] Embodiment 1: In some embodiments, please refer to the Figures 1 - 5 of the accompanying drawings of the specification. A method for installing a split beam of a high-position long-distance horizontal cable suitable for arch rib lifting includes the following steps:

[0037] Step 1: Weld the construction platform 3 to the main bridge body 7 in cooperation with the position of the arch rib 1;

[0038] Preferably, as shown in Figure 4 , the construction platform 3 includes channel steels 31, I-beams 32 and steel plates 33. There are multiple channel steels 31 and all are fixedly connected to the I-beam 32. The upper end of the I-beam 32 is fixedly connected to the steel plate 33. The steel plate 33 is connected to the transmission cable device 4. The upper end of the left steel plate 33 is fixedly connected to the vertical traction winch 2. The I-beam 32 is welded to the main bridge body 7.

[0039] The I-beam 32 serves as the main load-bearing member, the channel steel 31 serves as the secondary load-bearing member, and the steel plate 33 serves as the construction operation surface, enabling it to save materials while meeting the stress and deformation under various working conditions, ensuring economy while ensuring the overall strength of the platform and its reliability in use.

[0040] Preferably, the thickness of the steel plate 33 is 5 mm.

[0041] Preferably, as shown in Figure 1 , the main bridge body 7 includes a steel beam 71, lifting tower frames 72 and brackets 73. The steel beam 71 is an integral frame formed by welding multiple steel frames together. There are two lifting tower frames 72 and they are respectively fixedly installed on the left and right sides of the upper end of the steel beam 71. There are multiple brackets 73 and all are fixedly installed on the upper end of the steel beam 71. The brackets 73 are installed at the lower end of the arch rib 1 to support the arch rib 1. The I-beam 32 is welded to the lifting tower frame 72.

[0042] Preferably, the welding method of the I-beam 32 and the lifting tower frame 72 adopts double-sided welding or single-sided welding.

[0043] Step 2: Two construction platforms 3 are provided, one on each side of the bridge body 7. A vertical traction winch 2 is installed on the left steel plate 33. The total number of horizontal cable strands 5 to be installed is set. The vertical traction winch 2 pulls one end of a single horizontal cable strand 5 onto the left steel plate 33.

[0044] Step 3: The construction platforms 3 on the left and right sides are connected by a transmission cable device 4;

[0045] Preferably, Figure 2 As shown, the transmission rope device 4 includes a horizontal transmission winch 41, a fixed pulley 42 and a traction rope 43. The traction rope 43 is wound around the drum of the horizontal transmission winch 41 for N turns, and the traction rope 43 is sleeved on the outer end of the fixed pulley 42.

[0046] The upper end of the left steel plate 33 is fixedly connected to the lower end of the fixed pulley 42 , and the upper end of the right steel plate 33 is fixedly connected to the horizontal transmission winch 41 .

[0047] Preferably, N is 5.

[0048] Step 4: The end of the single horizontal cable steel strand 5 is connected to the traction rope 43 through the U-shaped bayonet 6, and the horizontal transmission winch 41 is started to drive the traction rope 43 to rotate counterclockwise. The traction rope 43 drives the single horizontal cable steel strand 5 from the left side of the arch rib 1 to the right side;

[0049] Preferably, the U-shaped bayonet 6 connects the horizontal cable strand 5 and the traction rope 43 together;

[0050] The size of the U-shaped bayonet 6 is adapted to the horizontal cable steel strand 5 and the traction rope 43 .

[0051] Step 5: Repeat step 4 above until all horizontal cable strands 5 are anchored on both sides of the arch rib 1 .

[0052] The present invention has a simple structure, is easy to manufacture, can be quickly manufactured according to on-site conditions, is easy to operate, and has high practicality, and is applicable to the installation of horizontal cable steel strands 5, thereby reducing time costs, machinery costs, material costs, and labor costs.

[0053] Embodiment 2: In some embodiments, as Figure 1 As shown, as a preferred embodiment of the present invention, before the actual installation operation is performed, the following pre-processing steps are included:

[0054] A1. Conduct strict quality inspections on all construction materials, including I-beams 32, channel steels 31, steel plates 33, horizontal cable strands 5, traction ropes 43, and U-shaped bayonet 6, to ensure that the material quality meets the design requirements.

[0055] A2. Conduct a comprehensive commissioning of the vertical traction winch 2 and the horizontal conveyor winch 41, check whether their performance is normal, and ensure stable operation during construction;

[0056] A3. Provide detailed technical disclosure and safety training to the construction personnel to make them familiar with the entire installation process and safety precautions.

[0057] The construction platform 3 is erected in the following steps:

[0058] B1. According to the design requirements, accurately determine the welding positions of the I-beams 32 at the arch rib 1, and use professional welding equipment and techniques to firmly weld the I-beams 32 to the arch rib 1. The welding quality shall meet the relevant welding standards to ensure the strength and stability of the welded joints;

[0059] B2. After welding, conduct flaw detection on the welded parts to ensure no welding defects;

[0060] B3. Weld the channel steels 31 above the I-beams 32 according to the requirements of the designed frame structure. The welding sequence and method of the channel steels 31 shall ensure the overall stability of the frame;

[0061] B4. After the frame is welded, check the flatness and perpendicularity to ensure that the frame meets the installation requirements;

[0062] B5. Lay the 5-mm steel plates 33 one by one on the I-beams 32, and fix the steel plates 33 to the I-beams 32 by welding or bolt connection to ensure that the steel plates 33 are firmly laid without looseness, providing a safe and reliable operating platform for subsequent construction.

[0063] The installation steps of the vertical traction winch 2 and the conveyor cable device 4 are as follows:

[0064] C1. On the left construction platform 3, according to the pre-designed installation position, use lifting equipment to hoist the vertical traction winch 2 to the designated position, and firmly fix it on the construction platform 3 by anchor bolts or other reliable fixing methods;

[0065] C2. After installation, check and adjust the installation perpendicularity and levelness of the vertical traction winch 2 to ensure its smooth operation;

[0066] C3. On the left construction platform 3, install the fixed pulley 42 at the calculated position and angle. The installation of the fixed pulley 42 shall ensure that its axis is horizontal and consistent with the wire rope extraction direction of the vertical traction winch 2;

[0067] C4. On the right construction platform 3 of the arch rib 1, also use lifting equipment to hoist the horizontal conveyor winch 41 to the predetermined position and firmly fix it;

[0068] C5. Conduct a comprehensive inspection and commissioning of the transmission system, braking system, etc. of the horizontal conveyor winch 41 to ensure its normal operation.

[0069] The assembly of the transmission cable device 4 includes the following steps:

[0070] D1. Clean the shaft end of the rotating device of the horizontal conveyor winch 41 to ensure there is no oil stain and impurity.

[0071] D2. Fix one end of the towing rope 43 on the shaft of the rotating device. According to the predetermined winding direction and number of turns (5 turns), tightly wind the towing rope 43 around the rotating device. Each turn of winding should ensure that the towing rope 43 is arranged neatly without crossing and overlapping.

[0072] D3. After winding is completed, pass the other end of the towing rope 43 through the guiding device and accurately connect it to the rope groove of the fixed pulley 42 already installed on the left construction platform 3.

[0073] D4. After connection, check the entire transmission cable device 4 to ensure that the towing rope 43 is firmly connected without looseness and the fixed pulley 42 can rotate flexibly.

[0074] The transmission of a single horizontal cable steel strand 5 includes the following steps:

[0075] E1. Hoist one end of the single horizontal cable steel strand 5 to the working area of the vertical traction winch 2, and connect the end of the horizontal cable steel strand 5 to the steel wire rope of the vertical traction winch 2 through a special fixture.

[0076] E2. Start the vertical traction winch 2, slowly lift the horizontal cable steel strand 5 above the construction platform 3, and then stop lifting.

[0077] E3. Move the end of the horizontal cable steel strand 5 to one side of the horizontal conveyor winch 41, and firmly connect the end of the horizontal cable steel strand 5 to the rotating towing rope 43 using a U-shaped clamp 6. Then check whether the connection part is reliable to ensure that the U-shaped clamp 6 is tightened in place.

[0078] E4. Start the horizontal conveyor winch 41 and make it rotate slowly in the counterclockwise direction. Driven by the towing rope 43, the horizontal cable steel strand 5 starts to be transmitted to the right side of the arch rib 1.

[0079] E5. During the transmission process, monitor the transmission condition of the horizontal cable steel strand 5, observe whether the horizontal cable steel strand 5 moves smoothly without jamming or deviation. If there is any abnormality, immediately stop the operation of the horizontal conveyor winch 41, and conduct inspection and adjustment.

[0080] Repeated operations and anchoring steps: According to the above-mentioned single horizontal cable strand 5 transmission steps, perform the transmission operation on each horizontal cable strand 5 in sequence. After completing the transmission of all horizontal cable strands 5, anchor the horizontal cable strands 5 on both sides of the arch rib 1 according to the design requirements.

[0081] The anchoring method can adopt anchor anchoring or other anchoring methods that meet the design requirements. During the anchoring process, strictly control the magnitude of the anchoring force and operate according to the given anchoring force value in the design to ensure the reliability of the anchoring. After the anchoring is completed, check all the anchoring parts to ensure there is no looseness or abnormality. Finally, conduct a comprehensive inspection and debugging of the entire horizontal cable installation system to ensure that it meets the design and usage requirements.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for installing a high-position long-distance horizontal cable with split bundles suitable for arch rib lifting, characterized in that: It includes the following steps: Step 1: The construction platform (3) is welded to the main bridge body (7) in cooperation with the position of the arch rib (1); Step 2: There are two groups of construction platforms (3) which are respectively arranged on the left and right sides of the main bridge body (7). A vertical traction winch (2) is installed on the left construction platform (3). Set the total number of horizontal cable steel strands (5) to be installed. The vertical traction winch (2) pulls one end of a single horizontal cable steel strand (5) to the left construction platform (3); Step 3: The construction platforms (3) on the left and right sides are connected by a transmission cable device (4); Step 4: The end of a single horizontal cable steel strand (5) is connected to the transmission cable device (4) through a U-shaped bayonet (6). The transmission cable device (4) thus drives the horizontal cable steel strand (5) to move, so that the horizontal cable steel strand (5) is transmitted from the left side of the arch rib (1) to the right side; Step 5: Repeat the above Step 4 until all the horizontal cable steel strands (5) are fully anchored on both sides of the arch rib (1).

2. The method for installing the high-position long-distance horizontal cable beam splitting applicable to the arch rib lifting according to claim 1, wherein The construction platform (3) includes channel steels (31), I-beams (32) and steel plates (33). There are multiple channel steels (31) and they are all fixedly connected to the I-beams (32). The upper end of the I-beam (32) is fixedly connected to the steel plate (33). The steel plate (33) is connected to the transmission cable device (4). The upper end of the left steel plate (33) is fixedly connected to the vertical traction winch (2). The I-beam (32) is welded to the main bridge body (7).

3. The method for installing the split beam of the high-position long-distance horizontal cable applicable to the arch rib lifting according to claim 2, wherein The thickness of the steel plate (33) is 5 mm.

4. The method for installing the split beam of the high-position long-distance horizontal cable applicable to the arch rib lifting according to claim 2, wherein, The main bridge body (7) includes a steel beam (71), lifting tower frames (72) and brackets (73). The steel beam (71) is an integral frame composed of multiple steel frames welded together. There are two lifting tower frames (72) which are respectively fixedly installed on the left and right sides of the upper end of the steel beam (71). There are multiple brackets (73) and they are all fixedly installed on the upper end of the steel beam (71). The brackets (73) are installed at the lower end of the arch rib (1) to support the arch rib (1). The I-beam (32) is welded to the lifting tower frame (72).

5. The method for installing the divided beam of the high-position long-distance horizontal cable applicable to the arch rib lifting according to claim 4, characterized in that The welding method of the I-beam (32) and the lifting tower frame (72) adopts double-sided welding or single-sided welding.

6. The method for installing the split beam of the high-position long-distance horizontal cable applicable to the arch rib lifting according to claim 2, wherein The transmission cable device (4) includes a horizontal transmission winch (41), a fixed pulley (42) and a traction rope (43). The traction rope (43) is wound around the drum of the horizontal transmission winch (41) for N turns. The traction rope (43) is sleeved on the outer end of the fixed pulley (42).

7. The method for installing the split beam of the high-position and long-distance horizontal cable applicable to the arch rib lifting according to claim 6, wherein The N adopts 5.

8. The method for installing the split beam of the high-position and long-distance horizontal cable applicable to the arch rib lifting according to claim 6, wherein, The upper end of the left steel plate (33) is fixedly connected to the lower end of the fixed pulley (42). The upper end of the right steel plate (33) is fixedly connected to the horizontal transmission winch (41).

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