High-position long-distance horizontal cable beam splitting installation method suitable for arch rib lifting

Abstract

The invention discloses a high-position long-distance horizontal cable splitting installation method suitable for arch rib lifting, and belongs to the technical field of bridge construction. A construction platform, a vertical traction winch, a horizontal conveying winch, a fixed pulley, a traction rope, a U-shaped bayonet and other devices are included; the method specifically comprises the steps that construction platforms are arranged at the anchoring positions of horizontal cable steel strands at the two ends of an arch rib, a vertical traction winch is installed on the construction platform on one side and used for pulling a single horizontal cable steel strand from the ground to an operation platform, and a horizontal conveying cable device is installed between the construction platforms to convey the horizontal cable steel strands and enable the horizontal cable steel strands to be anchored at the two ends of the arch rib; and the steps are repeated in sequence until all the horizontal cable steel strands are installed in place. In this way, the horizontal cable steel strand installation tool is simple in structural form, easy to machine and manufacture, capable of being rapidly manufactured according to site conditions, convenient and fast to operate, high in practicability and suitable for horizontal cable steel strand installation, and the time cost, the mechanical cost, the material cost and the labor cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to a method for installing a split bunch 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, it is an essential process to tension and pre-tighten the arch rib with horizontal cables. With the development of bridge construction technology, more and more bridge projects need to cross complex terrains and water areas. For example, in a bridge construction project across 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, a method of building a full-length temporary working platform outside the upper chord members is often used for the deployment and installation of horizontal cables.

[0004] However, this temporary working platform has many drawbacks; First: In terms of construction efficiency, the construction and disassembly of the temporary working platform both require a large amount of time and manpower, greatly prolonging the overall construction period; Second: From a safety perspective, the construction, use, and disassembly operations of the platform in a high-altitude environment not only increase the working intensity of construction workers but also face multiple safety risks such as high-altitude falls and object strikes. Once an accident occurs, the consequences are unimaginable.

[0005] Based on this, the present invention designs a method for installing a split bunch of high-position and long-distance horizontal cables suitable for arch rib lifting to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for installing a split bunch of high-position and long-distance horizontal cables suitable for arch rib lifting.

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A method for installing a split bunch of high-position and long-distance horizontal cables suitable for arch rib lifting, comprising the following steps: Step 1: Weld the construction platform in cooperation with the position of the arch rib to the main body of the bridge; Step 2: Two groups of construction platforms are provided and are respectively arranged on the left and right sides of the main body of the bridge. An installation vertical traction winch is installed on the left construction platform. Set the total number of horizontal cable steel strands to be installed, and the vertical traction winch pulls one end of a single horizontal cable steel strand to the left construction platform; Step 3: Connect the construction platforms on the left and right sides through a transmission cable device; Step 4: The end of the single horizontal cable steel strand is connected to the transmission cable device through a U-shaped bayonet, and the transmission cable device 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. Step 5: Repeat the above Step 4 until all the horizontal cable steel strands are anchored on both sides of the arch rib.

[0008] 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, and the I-beam is welded to the main body of the bridge.

[0009] Furthermore, the thickness of the steel plate is 5 mm.

[0010] Furthermore, the main body of the bridge includes a steel beam, lifting tower frames and brackets. The steel beam is an integral frame 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, and the I-beam is welded to the lifting tower frame.

[0011] Furthermore, the welding method of the I-beam and the lifting tower frame adopts double-sided welding or single-sided welding.

[0012] 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 turns, and the traction rope is sleeved on the outer end of the fixed pulley.

[0013] Furthermore, N is 5.

[0014] 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.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Improve construction efficiency: Through reasonable construction platform construction and equipment layout, adopting a mechanized traction and transmission method, the amount of manual operation is reduced, and the installation speed of the horizontal cable steel strand is increased. Compared with the traditional method, the construction efficiency is improved; 2. Ensure installation accuracy: By using a fixed pulley and the precisely controlled rotation of the winch, the position accuracy of the steel strand during transmission can be effectively ensured, the installation error is reduced, and the installation accuracy of the horizontal cable steel strand meets higher engineering requirements; 3. Reduce safety risks: Most operations are carried out on the constructed construction platform, reducing the direct working time and intensity of workers at high altitudes, reducing the safety risks brought by high-altitude operations, and effectively ensuring the life safety of construction personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the completion of the installation of the horizontal cable steel strands of the present invention; Figure 2 Schematic construction diagram of the installation of the horizontal cable steel strands of the present invention; Figure 3 Front view of the construction platform for the installation of the horizontal cable steel strands of the present invention; Figure 4 Cross-section of the construction platform for the installation of the horizontal cable steel strands of the present invention Figure 1 ; Figure 5 Cross-section of the construction platform for the installation of the horizontal cable steel strands of the present invention Figure 2 .

[0018] The reference numerals in the figures respectively represent: 1, arch rib; 2, vertical traction winch; 3, construction platform; 31, channel steel; 32, I-beam; 33, steel plate; 4, cable transmission 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, support. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 creative efforts fall within the scope of protection of the present invention.

[0020] The "left", "right", "front", "rear", "upper", and "lower" mentioned in the following description are oriented in the perspective direction of the front view.

[0021] Embodiment 1: In some embodiments, please refer to Figures 1 - 5 in the accompanying drawings of the specification, a method for installing a high-position long-distance horizontal cable in a split-beam manner suitable for arch rib lifting includes the following steps: Step 1: Weld the construction platform 3 in place corresponding to the arch rib 1 onto the main bridge body 7; Preferably, as Figure 4 shown, the construction platform 3 includes channel steels 31, I-beams 32 and steel plates 33. There are multiple channel steels 31, all of which are fixedly connected to the I-beams 32. The upper end of the I-beams 32 is fixedly connected to the steel plate 33. The steel plate 33 is connected to the cable conveyor device 4. The upper end of the left steel plate 33 is fixedly connected to the vertical traction winch 2. The I-beams 32 are welded to the main bridge body 7.

[0022] The I-beams 32 serve as the main load-bearing members, the channel steels 31 serve as secondary load-bearing members, and the steel plates 33 serve as the construction operation surface, enabling material savings while meeting the force and deformation requirements under various working conditions, ensuring economy while guaranteeing the overall strength of the platform and its reliability during use.

[0023] Preferably, the thickness of the steel plate 33 is 5 mm.

[0024] Preferably, as Figure 1 shown, the main bridge body 7 includes steel girders 71, lifting towers 72 and brackets 73. The steel girders 71 are an integral framework formed by welding multiple steel frames together. There are two lifting towers 72, which are respectively fixedly installed on the left and right sides of the upper end of the steel girders 71. There are multiple brackets 73, all of which are fixedly installed on the upper end of the steel girders 71. The brackets 73 are installed at the lower end of the arch rib 1 to support the arch rib 1. The I-beams 32 are welded to the lifting towers 72.

[0025] Preferably, the welding method of the I-beams 32 to the lifting towers 72 adopts double-sided welding or single-sided welding.

[0026] Step 2: There are two sets of construction platforms 3, which are respectively arranged on the left and right sides of the main bridge body 7. The vertical traction winch 2 is installed on the left steel plate 33. Determine 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 steel plate 33; Step 3: The construction platforms 3 on the left and right sides are connected by the cable conveyor device 4; Preferably, as Figure 2 shown, the cable conveyor device 4 includes a horizontal conveyor winch 41, a fixed pulley 42 and a traction rope 43. The traction rope 43 is wound around the drum of the horizontal conveyor winch 41 for N turns. The traction rope 43 is sleeved on the outer end of the fixed pulley 42.

[0027] 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 conveyor winch 41.

[0028] Preferably, N is 5.

[0029] Step 4: The end of the single horizontal cable steel strand 5 is connected to the towing rope 43 through the U-shaped bayonet 6. Start the horizontal conveyor hoist 41 to drive the towing rope 43 to rotate counterclockwise, and the towing rope 43 drives the single horizontal cable steel strand 5 to be conveyed from the left side of the arch rib 1 to the right side; Preferably, the U-shaped bayonet 6 connects the horizontal cable steel strand 5 and the towing rope 43 together; The size of the U-shaped bayonet 6 is adapted to the horizontal cable steel strand 5 and the towing rope 43.

[0030] 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.

[0031] The structure of the present invention is simple in form, easy to process and manufacture, and can be quickly manufactured according to the on-site situation. Moreover, the operation is convenient, the practicability is strong, it can be applied to the installation of the horizontal cable steel strand 5, and the time cost, mechanical cost, material cost and labor cost are shortened.

[0032] Embodiment 2: In some embodiments, as Figure 1 shown, as a preferred embodiment of the present invention, before actual installation operation, the following pre-treatment steps are included: A1. Conduct strict quality inspections on all construction materials, including I-beams 32, channel steels 31, steel plates 33, horizontal cable steel strands 5, towing ropes 43, U-shaped bayonets 6, etc., to ensure that the material quality meets the design requirements; A2. Conduct a comprehensive commissioning on the vertical traction hoist 2 and the horizontal conveyor hoist 41, check whether their performance is normal, and ensure that they can operate stably during the construction process; A3. Conduct a detailed technical disclosure and safety training for the construction personnel to make them familiar with the entire installation process and safety precautions.

[0033] The construction platform 3 is built, including the following steps: B1. According to the design requirements, accurately determine the welding position of the I-beam 32 at the arch rib 1, and use professional welding equipment and technology to firmly weld the I-beam 32 to the arch rib 1. The welding quality shall meet the relevant welding standards to ensure the strength and stability of the welding joint; B2. After welding, conduct flaw detection on the welding part to ensure that there are no welding defects; B3. Weld the channel steel 31 above the I-beam 32 according to the designed frame structure requirements. The welding sequence and method of the channel steel 31 shall ensure the overall stability of the frame; B4. After the frame welding is completed, check the flatness and perpendicularity to ensure that the frame meets the installation requirements; B5. Lay the 5 - mm steel plates 33 one by one on the I - beams 32, and fix the steel plates 33 on the I - beams 32 by welding or bolt connection to ensure that the steel plates 33 are laid firmly without looseness, providing a safe and reliable operation platform for subsequent construction.

[0034] The installation steps of the vertical traction hoist 2 and the cable conveyor device 4 are as follows: C1. On the construction platform 3 on the left side, according to the pre - designed installation position, use a lifting device to hoist the vertical traction hoist 2 to the designated position, and firmly fix it on the construction platform 3 by anchor bolts or other reliable fixing methods; C2. After installation, check and adjust the installation verticality and horizontality of the vertical traction hoist 2 to ensure its smooth operation; C3. On the construction platform 3 on the left side, install the fixed pulley 42 at the calculated position and angle. The installation of the fixed pulley 42 needs to ensure that its axis is horizontal and is consistent with the wire rope extraction direction of the vertical traction hoist 2; C4. On the construction platform 3 on the right side of the arch rib 1, also use a lifting device to hoist the horizontal conveyor hoist 41 to the predetermined position and fix it firmly; C5. Conduct a comprehensive inspection and debugging of the transmission system, braking system, etc. of the horizontal conveyor hoist 41 to ensure its normal operation.

[0035] The assembly of the cable conveyor device 4 includes the following steps: D1. Clean the shaft end of the rotating device of the horizontal conveyor hoist 41 to ensure that there is no oil stain and impurity; D2. Fix one end of the towing rope 43 on the shaft of the rotating device, and wind the towing rope 43 tightly around the rotating device according to the predetermined winding direction and number of turns (5 turns). Each turn of winding needs to ensure that the towing rope 43 is arranged neatly without crossing and overlapping; D3. After winding, connect the other end of the towing rope 43 to the rope groove of the fixed pulley 42 installed on the construction platform 3 on the left side through a guiding device accurately; D4. After connection, check the entire cable conveyor device 4 to ensure that the towing rope 43 is connected firmly without looseness and the fixed pulley 42 can rotate flexibly.

[0036] The transmission of a single - root horizontal cable steel strand 5 includes the following steps: E1. Hoist one end of the single - root horizontal cable steel strand 5 to the working area of the vertical traction hoist 2, and connect the end of the horizontal cable steel strand 5 to the wire rope of the vertical traction hoist 2 through a special fixture; E2. Start the vertical traction hoist 2, slowly lift the horizontal cable steel strand 5 above the construction platform 3, and then stop lifting; E3. Move the end of the horizontal cable steel strand 5 to one side of the horizontal transfer winch 41, and use the U-shaped clamp 6 to firmly connect the end of the horizontal cable steel strand 5 to the rotating towing rope 43. Then check whether the connection part is reliable to ensure that the U-shaped clamp 6 is tightened in place. E4. Start the horizontal transfer 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 transferred to the right side of the arch rib 1. E5. During the transfer process, monitor the transfer condition of the horizontal cable steel strand 5, observe whether the horizontal cable steel strand 5 moves smoothly, and whether there are any jamming or deviation phenomena. If there are any abnormalities, stop the operation of the horizontal transfer winch 41 in time for inspection and adjustment.

[0037] Repeat the operation and anchoring steps: According to the above-mentioned single horizontal cable steel strand 5 transfer steps, perform the transfer operation on each horizontal cable steel strand 5 in sequence. After all the horizontal cable steel strands 5 are transferred, anchor the horizontal cable steel strands 5 on both sides of the arch rib 1 according to the design requirements.

[0038] The anchoring method can adopt anchoring with anchor fittings 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 anchoring force value given in the design to ensure the reliability of the anchoring. After the anchoring is completed, check all the anchoring parts to ensure that there are no looseness and abnormalities. Finally, conduct a comprehensive inspection and debugging of the entire horizontal cable installation system to ensure that it meets the design and usage requirements.

[0039] 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 for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for installing split bundles of high-position and long-distance horizontal cables 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 sets of construction platforms (3) which are respectively arranged on the left and right sides of the main bridge body (7). The 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 split bundles of high-position and long-distance horizontal cables suitable for arch rib lifting according to claim 1, characterized in that, 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-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).

3. The method for installing split bundles of high-position and long-distance horizontal cables suitable for arch rib lifting according to claim 2, characterized in that, The thickness of the steel plate (33) is 5 mm.

4. The method for installing split bundles of high-position and long-distance horizontal cables suitable for arch rib lifting according to claim 2, characterized in that, 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) 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 split bundles of high-position and long-distance horizontal cables suitable for 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 split bundles of high-position and long-distance horizontal cables suitable for arch rib lifting according to claim 2, characterized in that, 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 circles. The traction rope (43) is sleeved on the outer end of the fixed pulley (42).

7. The method for installing split bundles of high-position and long-distance horizontal cables suitable for arch rib lifting according to claim 6, characterized in that, The N adopts 5.

8. The method for installing split bundles of high-position and long-distance horizontal cables suitable for arch rib lifting according to claim 6, characterized in that, 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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