Bidirectional guy cable self-anchored deck crane and construction method thereof

Abstract

The bidirectional guy cable self-anchored deck crane comprises a main body frame, at least one part of the main body frame covers the upper end of an installed main beam, the front end of the main body frame extends out of the end face of the installed main beam and forms a cantilever section, the rear end of the main body frame forms a covering section, and the main body frame is movably arranged relative to the installed main beam. A girder to be installed can be hung at the lower end of the cantilever section, meanwhile, a lifting system of the girder to be installed is arranged at the upper end of the cantilever section, at least one front-end hanging point is arranged at the upper end of the cantilever section, the front-end hanging points are hung and hoisted by bridge towers on the front side and the rear side through hoisting cables, and temporary inhaul cables of the bridge towers are used for mainly bearing the weight of the hoisted girder section. The load of the hoisting beam section on the installed main beam is greatly reduced, and the hoisting capacity is remarkably improved.

Description

Technical Field

[0001] This application relates to the technical field of bridge construction engineering, specifically to the technical field of a two-way cable-stayed self-anchored deck crane and its construction method. Background Art

[0002] In the current field of cable-stayed bridge construction, as the span of bridges continues to increase, the length and weight of the main girder segments are also gradually increasing, which poses higher requirements for the lifting capacity of the deck crane and the mechanical properties of the installed main girder.

[0003] Currently, a deck crane based on a diamond truss structure is widely used in cable-stayed bridge construction. The design feature of this crane is that it has a cantilever section at the front end and is equipped with a dedicated lifting system for accurately hoisting the main girder segments; while the rear end is fixed to the installed main girder through an anchoring method to ensure the stability of the entire device during operation. For example, Patent CN202210884209.3, a multi-functional deck crane for a middle cable-plane cable-stayed bridge, discloses a solution for hoisting a steel girder in place and completing the welding of the steel girder using a diamond-shaped deck crane.

[0004] The current deck crane solution faces a significant problem when dealing with longer and heavier main girder segments: as the weight of the main girder segments increases, the overturning moment of the deck crane also increases. This results in an increase in the force exerted by the middle fulcrum of the crane on the installed main girder, increasing the mechanical burden on the local area of the main girder. When this force exceeds the bearing capacity of the installed main girder, it will limit the hoisting weight and length of the main girder segments, because excessive force may cause structural instability or damage. Summary of the Invention

[0005] In view of the above-mentioned requirements, this application proposes a two-way cable-stayed self-anchored deck crane and its construction method, aiming to significantly reduce the adverse effects of the deck crane load on the installed beam end during the hoisting operation of the main girder, improve the hoisting capacity of the main girder, and solve the problem of difficult construction for long-span and heavy main girders.

[0006] To achieve the above object, this application adopts the following technical solutions:

[0007] In the first aspect, this application provides a two-way cable-stayed self-anchored deck crane, including a main body frame, at least a part of the main body frame covering the upper end of the installed main girder, and the front end of the main body frame extending beyond the end face of the installed main girder to form a cantilever section, and the rear end forming a covering section, the main body frame being movably arranged relative to the installed main girder;

[0008] The lower end of the cantilever section can hang the main girder to be installed, and at the same time, a lifting system for the main girder to be installed is provided at the upper end, and at least one front suspension point is provided at the upper end of the cantilever section;

[0009] The front suspension points are suspended by the bridge towers on both the front and rear sides through lifting cables.

[0010] In this way, the temporary stay cables of the bridge towers are utilized to mainly bear the weight of the hoisted beam segments, greatly reducing the load of the hoisted beam segments on the already installed main girders and significantly improving the hoisting capacity. At the same time, the two-way stay cables achieve self-balancing of the horizontal component forces, reducing the influence of the horizontal component forces on the already installed beam segments. This design optimizes the force distribution, enabling the crane to handle longer and heavier beam segments without increasing the local load, which not only broadens the application range of the equipment but also improves the construction efficiency.

[0011] Specifically, in the design of the cantilever section, the lower end suspends the main girder to be installed, and the upper end is equipped with a lifting system for the main girder to be installed, ensuring that the new beam segment can be accurately and safely hoisted into place. And at least one front suspension point is provided at the upper end of the cantilever section, and these suspension points are suspended by the bridge towers on the left and right sides through stay cables. This two-way stay cable mechanism effectively disperses the overturning moment generated during the hoisting process, reduces the stress concentration in the local area of the already installed main girder, thereby enhancing the safety and stability of the overall structure.

[0012] In some possible embodiments, the main body frame is a rectangular truss.

[0013] In some possible embodiments, the rear end of the main body frame and the covered section of the already installed main girder are provided with rear support points.

[0014] In some possible embodiments, the rear support points are provided with traveling rollers.

[0015] In some possible embodiments, the front suspension points are arranged at the front end of the lifting system.

[0016] In some possible embodiments, corresponding to the lifting cables, balance cables are provided at the other end of the bridge tower.

[0017] In some possible embodiments, the bridge towers can be the middle towers at both ends of the middle span or the auxiliary towers of the side spans.

[0018] In a second aspect, the present application also provides a construction method for constructing a main girder by using a two-way stay cable self-anchored deck crane as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an overall installation schematic diagram of the two-way stay cable self-anchored deck crane of the present application;

[0020] Figure 2 is a schematic diagram of the installation state of the stay cables of the two-way stay cable self-anchored deck crane of the present application;

[0021] Figure 3 This is the force analysis diagram of the two-way cable-stayed self-anchored bridge deck crane of the present application;

[0022] Figure 4 This is the schematic diagram of the displacement of the two-way cable-stayed self-anchored bridge deck crane of the present application;

[0023] Figure 5 This is the schematic diagram of the bridge deck crane with a diamond truss structure in the prior art;

[0024] Figure 6 This is the flow chart of the construction method of the two-way cable-stayed self-anchored bridge deck crane of the present application. Detailed Description of the Invention

[0025] The following further details the features of the present application and other related features through embodiments for the understanding of those skilled in the same industry:

[0026] It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component, respectively.

[0027] Furthermore, unless otherwise clearly defined and limited, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this case can be understood according to specific situations.

[0028] First, please refer to Figure 5 The traditional bridge deck crane is installed on the already installed main beam 100, and the already installed main beam 100 is cable-stayed from the bridge tower by the stay cables 200. At this time, the bridge deck crane adopts the diamond truss L1 structure, one end of its diamond structure is installed on the already installed main beam 100, and the other end extends out of the already installed main beam 100 and forms a suspension area for hoisting the to-be-installed main beam 300. The biggest drawback of this method is that when the weight of the to-be-installed main beam 300, that is, the beam end, is relatively heavy or the distance of the already installed main beam 100 is long, the moment of force of the bridge deck crane on the already installed main beam 100 becomes larger and larger, making it difficult for the already installed main beam 100 to meet the force requirements.

[0029] Please refer to Figure 1 and Figure 2, a two-way cable-stayed self-anchored deck crane of the present application includes a main frame 1, at least a part of the main frame 1 covers the upper end of the installed main beam 100, and the front end of the main frame 1 extends beyond the end face of the installed main beam 100 and forms a cantilever section 11. At this time, the main frame 1 can move in the front-back direction relative to the installed main beam 100.

[0030] Further, the lower end of the cantilever section 11 can hang the main beam 300 to be installed. At the same time, a lifting system 2 for the main beam 300 to be installed is provided at the upper end, and at least one front suspension point 3 is provided at the upper end of the cantilever section 11. The front suspension point 3 is suspended and lifted by the lifting cables 400 of the bridge towers on the left and right sides.

[0031] Specifically, the main frame 1 is selected as a rectangular truss to simplify the installation and force-bearing structure. Further, a rear support point 4 is provided at the covered section 12 of the main frame 1 of the rectangular truss and the installed main beam 100. The lifting system 2 can be designed using a winch and a pulley block, which is a commonly used technical means in the industry and will not be described in detail here.

[0032] In the above description, the cantilever section 11 and the covered section 12 are used to describe the lifting section of the main beam 300 to be installed in the attachment Figure 2 It mainly represents the functions of different segments of the main frame 1 and should not evaluate its position state during the moving stage at the same time.

[0033] During application, one front suspension point 3 can be adopted, and its position can be set at the front end of the lifting system 2, forming a lever effect with the rear support point 4 at the front end of the lifting system 2 to improve the lifting capacity.

[0034] Further, please refer specifically to Figure 1 , in the description of the bridge tower used in the present application, it can be understood as the middle towers at both ends of the middle span, such as the left middle tower 510 and the right middle tower 520 in the figure, and auxiliary towers 530 are provided in the side spans. During operation, the lifting cables 400 will act on the bridge towers. At this time, in order to balance the forces on the bridge towers, corresponding balance cables will be set at the other end of the bridge towers. Such as the side-span balance cable 610 in the figure, and a middle-span balance cable 620 can also be added in the middle span. The balance cables are used to balance the horizontal component forces at the top of the bridge towers, and the rear balance cables of the towers are anchored to the ground.

[0035] For a double-tower cable-stayed bridge, construction can be carried out simultaneously at both ends of the middle tower. At this time, there are specific differences in the balance cables of the middle span and the side spans. The lifting cables 400 in the middle span can be anchored to the tops of the two middle towers, and one of the lifting cables 400 in the side span is anchored to the top of the middle tower, and the other is anchored to the top of the pier of the side-span auxiliary tower 530. Independent two-way cable-stayed self-anchored systems are set for the left and right middle towers, the middle span and the side spans, without interference with each other, realizing independent beam lifting in each span section.

[0036] In this way, by using the temporary stay cables of the pylon, that is, the hoisting cables 400, to mainly bear the weight of the hoisted beam segment, the load of the hoisted beam segment on the already installed main girder is greatly reduced, and the hoisting capacity is significantly improved. At the same time, the two-way stay cables achieve self-balancing of the horizontal component forces, reducing the influence of the horizontal component forces on the already installed beam segment 100. This design optimizes the force distribution, enabling the crane to handle longer and heavier beam segments without increasing the local load, which not only broadens the application range of the equipment but also improves the construction efficiency.

[0037] Specifically, in the design of the cantilever segment 11, the lower end suspends the main girder 300 to be installed, and the upper end is equipped with a lifting system 2 for the main girder 300 to be installed, ensuring that the new beam segment can be accurately and safely hoisted in place. At the upper end of the cantilever segment 11, there are at least one front suspension point 3, and these suspension points are suspended and hoisted by the stay cables from the pylons on both the left and right sides. This two-way stay cable mechanism effectively disperses the overturning moment generated during the hoisting process, reduces the stress concentration in the local area of the already installed main girder 100, thereby enhancing the safety and stability of the overall structure.

[0038] At this time, for the basic force condition of the deck crane, please refer to Figure 3 . A rectangular truss is used as a simply supported beam to hoist the main girder 300 to be installed. At this time, the hoisting point is close to the front suspension point 3 to reduce the force on the already installed main girder 100 at the rear end, that is, the end support force. The lifting force of the hoisting cable 400, the two-way hoisting cables 400 at the front suspension point 3 of the main frame 1 can self-balance the horizontal separation of the stay cables, and a balance cable is set behind the pylon to balance the horizontal component force at the top of the pylon.

[0039] After the hoisting is completed, the main girder 300 to be installed will become the new already installed main girder 100. Please refer to Figure 4 . After the installation is completed, the forming method of the deck crane is as follows. If the deck crane moves forward, the hoisting cable 400 on the right side of the front suspension point 3 is tightened, and the hoisting cable 400 on the left side is loosened. The deck crane generates a horizontal forward pulling force, driving the deck crane to move forward. At this time, for convenient movement, walking rollers 41 are provided at the rear support point 4, allowing the deck crane to walk on the top surface of the already installed segment until it reaches the designated position.

[0040] Please refer to Figure 5 . For a construction method of using a two-way stay cable self-anchored deck crane as described above for main girder construction, the construction method steps are as follows:

[0041] Step S1: Installation of the deck crane. Install the deck crane on the top surface of the already completed main girder, including the installation of the hoisting cables;

[0042] Step S2: Movement of the deck crane. The deck crane moves forward to the front end of the already installed main girder under the traction of the stay cables;

[0043] Step S3: Construction of the main girder installation. The lifting system of the deck crane is used for hoisting and connecting the main girder;

[0044] Step S4: Repeat the process of crane walking and main girder installation until the installation of the main girder is completed.

[0045] As described above, the present case protects a two-way cable-stayed self-anchored deck crane and its construction method. All technical solutions identical or similar to the present case should be regarded as falling within the protection scope of the present case.

Claims

1. A two-way cable-stayed self-anchored deck crane, characterized in that, It includes a main body frame (1), at least a part of the main body frame (1) covers the upper end of the installed main girder (100), and the front end of the main body frame (1) extends beyond the end face of the installed main girder (100) to form a cantilever section (11), and the rear end forms a covering section (12). The main body frame (1) is movably arranged relative to the installed main girder (100). The lower end of the cantilever section (11) can hang the main girder to be installed (300), and at the same time, a lifting system (2) for the main girder to be installed is provided at the upper end. At least one front suspension point (3) is provided at the upper end of the cantilever section (11). The front suspension point (3) is hung and lifted by the lifting cables (400) of the bridge towers on both the front and rear sides.

2. The two-way cable-stayed self-anchored deck crane according to claim 1, characterized in that, The main body frame (1) is a rectangular truss.

3. The two-way cable-stayed self-anchored bridge deck crane according to claim 2, characterized in that, A rear support point (4) is provided between the rear end of the main body frame (1) and the covering section (12) of the installed main girder (100).

4. The two-way cable-stayed self-anchored deck crane according to claim 3, characterized in that, The rear support point (4) is provided with traveling rollers (41).

5. A two-way cable-stayed self-anchored bridge deck crane according to claim 1, characterized in that, The front suspension point (3) is arranged at the front end of the lifting system (2).

6. The two-way cable-stayed self-anchored bridge deck crane according to claim 1, wherein It further includes a balance cable provided at the other end of the bridge tower corresponding to the lifting cable (400).

7. The two-way cable-stayed self-anchored bridge deck crane according to claim 1, characterized in that, The bridge tower can be the middle tower at both ends of the mid-span or the auxiliary tower (530) of the side span.

8. A construction method of a two-way cable-stayed self-anchored deck crane, characterized in that, Applying a two-way cable-stayed self-anchored deck crane as described in any one of claims 1 to 7, the construction steps are as follows; Step S1: Installation of the deck crane. Install the deck crane on the top surface of the completed main girder, including the installation of the lifting cables. Step S2: Travel of the deck crane. The deck crane moves forward to the front end of the installed main girder under the traction of the stay cables. Step S3: Construction of the main girder installation. Use the lifting system of the deck crane for the hoisting and connection of the main girder. Step S4: Repeat the processes of the crane travel and the main girder installation until the main girder installation is completed.

9. The construction method of a two-way cable-stayed self-anchored deck crane as claimed in claim 8, characterized in that, The deck crane can be arranged for simultaneous construction at both ends of the middle tower.

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