A device and method for dismantling a whole of a cable-stayed bridge double-cantilever construction crane in a working condition

Abstract

This invention relates to the field of bridge construction technology, specifically to a device and method for the overall dismantling of a girder erection crane in a cable-stayed bridge with double cantilever construction. The device comprises a lifting device, a pressure sensor, a ballast cart, and a control device. The lifting device is used to lift the girder erection crane; the pressure sensor monitors the pressure changes on the beam surface during lifting; the ballast cart is positioned on the beam surface of the cantilever where the girder erection crane is located, close to the main tower; the control device is connected to the pressure sensor and the ballast cart, receiving signals from the pressure sensor and controlling the ballast cart to move towards the girder erection crane based on pressure change signals. This method solves the problem in existing technologies where the girder erection crane is dismantled piece by piece before being transported out of the construction site, resulting in long construction periods, high time consumption, and high risks.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a device and method for the overall dismantling of a girder erection crane for a cable-stayed bridge in a double cantilever configuration. Background Technology

[0002] The beam crane mainly consists of a metal structure assembly, a hoisting mechanism assembly, a lifting device, a luffing and traversing mechanism, a moving anchoring and support mechanism, a ladder platform assembly, an electrical system, a hydraulic system, and a counterweight.

[0003] The girder erection crane is located on the outermost side of the cantilever bridge. Traditional girder erection crane construction for cable-stayed bridges uses a segmented dismantling method. After the girder erection process is completed, the crane is used to disassemble each component of the girder erection crane before transporting them out of the construction site.

[0004] However, this method involves a long construction period, requires a large amount of manpower for dismantling, and has a high risk factor. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a device and method for the overall dismantling of a girder erection crane in the case of a double cantilever cable-stayed bridge. This invention can solve the problem that the existing technology uses a crane to dismantle each member of the girder erection crane and then transports them out of the construction site, resulting in a long construction period, high time consumption and high risk factor.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] On one hand, the present invention provides an overall dismantling device for a girder erection crane in the case of a double cantilever cable-stayed bridge, comprising:

[0008] Lifting device, used for lifting beam-erecting cranes;

[0009] Pressure sensors are used to monitor changes in pressure on the beam surface when the girder crane lifts it.

[0010] The counterweight vehicle is used to be placed on the beam surface of the cantilever where the girder erecting crane is located, and is set close to the main tower;

[0011] A control device, which is connected to the pressure sensor and the counterweight vehicle signal, is used to receive the signal from the pressure sensor and control the counterweight vehicle to move toward the girder crane according to the pressure change signal from the pressure sensor.

[0012] In some alternative designs, the device also includes a limiting baffle that is positioned on the beam surface at the stopping position of the ballast vehicle.

[0013] In some alternative schemes, the stopping position of the ballast car is determined based on the formula X=(M1g*L1-M2g*L2) / M2g, where M1 is the mass of the girder erecting crane, L1 is the distance between the girder erecting crane and the center of the main tower, L2 is the distance between the initial position of the ballast car and the center of the main tower, M2 is the full-load mass of the ballast car, and g is the acceleration due to gravity.

[0014] In some alternative solutions, the moving speed of the counterweight vehicle is based on the formula: V=[(F i *L1-M2g*L2) / M2g] / t is determined, where t is the unloading time, F i Let be the unloading force for the i-th time.

[0015] In some alternative designs, the device also includes an inclined ramp positioned at the initial location of the ballast cart and located below it.

[0016] In some alternative designs, the device also includes a traction rope, a pulley block, and a winding machine. The fixed pulley end of the pulley block is used to fix it to the beam surface, and the movable pulley end of the pulley block is used to connect to the beam erecting crane. One end of the traction rope is used to connect to the beam surface, and the winding machine is mounted on the counterweight vehicle. The other end of the traction rope passes around the pulley block and is connected to the winding machine.

[0017] In some alternative configurations, when the ballast cart is positioned on the beam surface, the traction rope between the pulley block and the ballast cart is parallel to the beam surface.

[0018] On the other hand, the present invention also provides a method for the overall dismantling of a girder erection crane for a cable-stayed bridge in a double cantilever condition. This method is implemented using the aforementioned device for the overall dismantling of a girder erection crane for a cable-stayed bridge in a double cantilever condition, and is characterized by including the following steps:

[0019] The lifting and girder erecting crane is used to monitor the pressure changes on the beam surface during the lifting process.

[0020] Based on the pressure change signal from the pressure sensor, the counterweight vehicle moves on the beam surface toward the girder erecting crane.

[0021] In some alternative solutions, when lifting the girder erecting crane, the lifting device adopts a staged loading method on the girder erecting crane, and the stopping position of the counterweight vehicle after each stage of loading is based on formula X. i =(F i *L1-M2g*L2) / M2g is determined, F i For the loading of the lifting device, L1 is the distance between the girder crane and the center of the main tower, L2 is the distance between the initial position of the ballast car and the center of the main tower, M2 is the full load mass of the ballast car, and g is the acceleration due to gravity.

[0022] In some alternative solutions, during the staged loading before the girder crane is lifted, the traction rope is wound up by a winding machine installed on the ballast car as the ballast car moves.

[0023] When the gantry crane lifts the load for the current load and the ballast car moves, the winding machine does not work. The pulley block is set with an amplification factor to move the ballast car according to the preset height to which the gantry crane is lifted, so that when the gantry crane is lifted to the preset height, the ballast car moves a set distance on the beam surface according to the amplification factor.

[0024] Compared with existing technologies, the advantages of this invention are as follows: When using this device for the overall hoisting and dismantling of a double cantilever beam erecting crane, the lifting device lifts the erecting crane, and pressure sensors simultaneously monitor the pressure changes on the beam surface during the hoisting process. The control device, based on the pressure change signal from the pressure sensor, moves the counterweight cart on the beam surface toward the erecting crane. In this solution, by moving the counterweight cart on the beam surface toward the erecting crane based on the pressure change signal, the sudden unloading of the beam surface during the overall hoisting and dismantling of the erecting crane is counteracted. By placing the counterweight cart on the beam surface of the cantilever where the erecting crane is located, and close to the main tower, when the erecting crane is lifted, the counterweight cart moves toward the erecting crane, i.e., toward the cantilever end, thus counteracting the sudden unloading of the beam surface during the overall hoisting and dismantling of the erecting crane. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall dismantling device for the girder erection crane in the double cantilever construction condition of a cable-stayed bridge, as shown in this embodiment of the invention.

[0027] Figure 2 This is a schematic diagram of the pulley system in an embodiment of the present invention.

[0028] In the diagram: 1. Ballast truck; 2. Beam surface; 3. Limiting baffle; 4. Inclined slope; 5. Traction rope; 6. Pulley block; 61. Fixed pulley end; 62. Moving pulley end; 7. Beam erecting crane. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, on one hand, the present invention provides an overall dismantling device for a cable-stayed bridge double cantilever girder erection crane, including: a lifting device, a pressure sensor, a counterweight vehicle 1, and a control device.

[0032] The lifting device is used to lift the girder erecting crane 7; the pressure sensor is used to monitor the pressure change on the beam surface when the girder erecting crane 7 is lifted; the counterweight cart 1 is used to be set on the beam surface 2 of the cantilever where the girder erecting crane 7 is located, and is set close to the main tower; the control device is connected to the pressure sensor and the counterweight cart, and is used to receive the signal from the pressure sensor and control the counterweight cart to move towards the girder erecting crane 7 according to the pressure change signal from the pressure sensor.

[0033] When using this device for the overall lifting and dismantling of the double cantilever beam erecting crane 7, the lifting device lifts the erecting crane 7, and pressure sensors simultaneously monitor the pressure changes on the beam surface during the lifting of the erecting crane 7. Based on the pressure change signal from the pressure sensors, the control device moves the counterweight cart 1 on the beam surface toward the erecting crane 7. In this scheme, by moving the counterweight cart 1 on the beam surface toward the erecting crane 7 based on the pressure change signal, the sudden unloading of the beam surface during the overall lifting and dismantling of the erecting crane 7 is counteracted. By placing the counterweight cart on the beam surface 2 of the cantilever where the erecting crane 7 is located, and close to the main tower, when the erecting crane 7 is lifted, the counterweight cart 1 moves toward the erecting crane 7, that is, toward the cantilever end, thus counteracting the sudden unloading of the beam surface during the overall lifting and dismantling of the erecting crane 7.

[0034] In some alternative designs, the device also includes a limiting baffle 3, which is set on the beam surface 2 at the stop position of the counterweight vehicle 1.

[0035] In this embodiment, the distance that the ballast car 1 should displace when the girder erecting crane 7 is lifted can be calculated by using the starting position and weight of the ballast car 1, as well as the position and weight of the girder erecting crane 7. Since the ballast car 1 has a large mass and is difficult to stop, a limiting baffle 3 is placed at the stopping position of the ballast car 1 before lifting the girder erecting crane 7 to limit excessive displacement of the ballast car 1 and prevent excessive bending moment caused by excessive displacement.

[0036] In some optional embodiments, the stopping position of the ballast car 1 is determined based on the formula X=(M1g*L1-M2g*L2) / M2g, where M1 is the mass of the girder erecting crane 7, L1 is the distance between the girder erecting crane 7 and the center of the main tower, L2 is the distance between the initial position of the ballast car 1 and the center of the main tower, M2 is the full-load mass of the ballast car 1, and g is the acceleration due to gravity.

[0037] In this example, a water bag is placed on the ballast cart 1. The overall weight of the ballast cart 1 can be adjusted by adding or removing water from the water bag so that the ballast cart can meet the requirement of X=(M1g*L1-M2g*L2) / M2g.

[0038] In this embodiment, by using the starting position and weight of the ballast car 1, and the position and weight of the girder erecting crane 7, the distance that the ballast car 1 should displace when the girder erecting crane 7 is lifted can be calculated. This ensures that the moment on the beam surface is equal before and after the girder erecting crane 7 lifts the beam, and that the beam surface does not experience eccentric loading.

[0039] In some alternative embodiments, the moving speed of the counterweight vehicle 1 is based on the formula: V=[(F i *L1-M2g*L2) / M2g] / t is determined, where t is the unloading time, F i Let be the unloading force for the i-th time.

[0040] In this embodiment, the speed of the counterweight vehicle 1 is controlled according to the magnitude and speed of the unloading force on the girder crane 7 each time, so that the moment on the beam surface is equal and balanced in real time when the girder crane 7 is lifted, and the beam surface does not experience eccentric loading.

[0041] In some alternative embodiments, the device further includes an inclined ramp 4, which is located at the initial position of the ballast cart 1 and below the ballast cart 1.

[0042] In this embodiment, an inclined ramp 4 is set at the initial position of the ballast car 1, and the ballast car 1 is positioned on the inclined ramp 4, with the inclined ramp 4 facing the girder crane 7. Since the ballast car 1 is heavy, it is difficult to start initially. Setting the inclined ramp 4 at the initial position can help start the ballast car 1.

[0043] In other embodiments, inclined ramps can be provided along the entire displacement path of the counterweight vehicle 1, so that the counterweight vehicle 1 can move well along the entire moving path of the girder crane 7.

[0044] Combination Figure 2As shown, in some optional embodiments, the device further includes a traction rope 5, a pulley block 6, and a winding machine. The fixed pulley end 61 of the pulley block 6 is used to fix it to the beam surface 2, and the movable pulley end 62 of the pulley block 6 is used to connect to the beam erecting crane 7. One end of the traction rope 5 is used to connect to the beam surface 2, and the winding machine is mounted on the counterweight vehicle 1. The other end of the traction rope 5 passes around the pulley block 6 and is connected to the winding machine.

[0045] In this embodiment, during the staged loading before the girder crane 7 is lifted, the ballast car 1 is moved by winding the traction rope through a winding machine installed on the ballast car 1. The moving speed and moving distance of the ballast car 1 can be controlled by controlling the speed and length of the winding traction rope.

[0046] Because the girder erecting crane 7 is large in size and weight, a collision with the beam surface when it is lifted could cause unnecessary damage. To prevent this collision, the final lifting force applied to the girder erecting crane 7 is applied rapidly, and a preset lifting height is set to avoid collision between the crane and the beam surface during lifting.

[0047] Therefore, during the loading process when the girder erecting crane 7 is lifted, the winding machine is not activated. Even if the winding machine does not wind up the traction rope, the pulley block 6 is set with an amplification factor based on the preset height at which the girder erecting crane 7 is lifted. This ensures that when the girder erecting crane 7 is lifted to the preset height, the ballast car 1 moves a set distance on the beam surface according to the amplification factor. This design guarantees that after the girder erecting crane 7 is lifted to the preset height, the ballast car 1 will move according to the predetermined distance, thereby achieving precise control of the bending moment at the cantilever end of the bridge.

[0048] In some alternative embodiments, when the ballast cart 1 is located on the beam surface 2, the traction rope 5 between the pulley block 6 and the ballast cart 1 is parallel to the beam surface 2.

[0049] In this embodiment, the fixed pulley end of the pulley block 6 is fixed to the beam surface 2 by a bracket, and the end of the traction rope 5 connected to the winding machine after passing around the pulley block 6 is parallel to the beam surface. This ensures that the traction rope 5 does not affect the vertical load of the beam erecting crane 7 and is beneficial to the movement of the traction counterweight vehicle 1.

[0050] In addition, in this example, when using the overall dismantling device of the girder erection crane in the double cantilever condition of the cable-stayed bridge, two ballast cars 1 can be set up at intervals in the transverse direction. Each ballast car 1 is connected to the girder erection crane 7 in the same way. This can maintain the force balance of the girder erection crane 7 and make it easier to maintain the balance of the girder erection crane 7.

[0051] On the other hand, the present invention provides a method for the overall dismantling of a girder erection crane for a cable-stayed bridge in a double cantilever configuration. This method is implemented using the aforementioned device for the overall dismantling of a girder erection crane for a cable-stayed bridge in a double cantilever configuration, and includes the following steps:

[0052] S1: Lifting the girder erecting crane 7, while monitoring the pressure changes on the beam surface when lifting the girder erecting crane 7.

[0053] In some optional embodiments, when lifting the girder erecting crane 7, the lifting device adopts a staged loading method for the girder erecting crane 7, and the stopping position of the counterweight vehicle 1 after each stage of loading is based on formula X. i =(F i *L1-M2g*L2) / M2g is determined, F i For the loading of the lifting device, L1 is the distance between the girder erecting crane 7 and the center of the main tower, L2 is the distance between the initial position of the ballast cart 1 and the center of the main tower, M2 is the full-load mass of the ballast cart 1, and g is the acceleration due to gravity. Using the initial position and weight of the ballast cart 1, and the position and weight of the girder erecting crane 7, the distance the ballast cart 1 should displace when the girder erecting crane 7 is lifted can be calculated. This ensures that the moment on the beam surface is equal before and after lifting by the girder erecting crane 7, and that no eccentric loading occurs on the beam surface.

[0054] S2: Determine the moving speed of the counterweight vehicle towards the girder crane 7 based on the pressure change signal from the pressure sensor.

[0055] In some alternative embodiments, the moving speed of the counterweight vehicle 1 is based on the formula: V=[(F i *L1-M2g*L2) / M2g] / t is determined, where t is the unloading time, F i Let be the unloading force for the i-th time. Based on the magnitude and speed of the unloading force on the girder crane 7 each time, the speed of the counterweight vehicle 1 is controlled to ensure that the moment on the beam surface is equal and balanced in real time when the girder crane 7 is lifting, so that the beam surface does not experience eccentric loading.

[0056] S3: Move the counterweight vehicle 1 on the beam surface at a speed determined based on the pressure change signal.

[0057] In some alternative solutions, during the staged loading before the girder crane 7 is lifted, the traction rope is wound up by a winding machine installed on the ballast car 1 as the ballast car 1 moves.

[0058] When the gantry crane 7 is lifted during the loading, the winding machine does not work. The pulley block 6 is set with an amplification factor to move the counterweight car 1 according to the preset height to which the gantry crane 7 is lifted, so that when the gantry crane 7 is lifted to the preset height, the counterweight car 1 moves a set distance on the beam surface according to the amplification factor.

[0059] In summary, when using this device for the overall lifting and dismantling of the double cantilever beam erecting crane 7, the lifting device lifts the erecting crane 7, and the pressure sensor simultaneously monitors the pressure changes on the beam surface during the lifting of the erecting crane 7. Based on the pressure change signal from the pressure sensor, the control device moves the counterweight cart 1 on the beam surface toward the erecting crane 7. In this scheme, by moving the counterweight cart 1 on the beam surface toward the erecting crane 7 based on the pressure change signal, the sudden unloading of the beam surface during the overall lifting and dismantling of the erecting crane 7 is offset. By placing the counterweight cart on the beam surface 2 of the cantilever where the erecting crane 7 is located, and placing it close to the main tower, when the erecting crane 7 is lifted, the counterweight cart 1 moves toward the erecting crane 7, that is, toward the cantilever end, thus offsetting the sudden unloading of the beam surface during the overall lifting and dismantling of the erecting crane 7.

[0060] Before the girder erecting crane 7 is lifted, during the staged loading process, the ballast car 1 moves by winding up the traction rope via a retractor mounted on it. The speed and distance of movement of the ballast car 1 can be controlled by adjusting the speed and length of the winding traction rope. During the loading phase when the girder erecting crane 7 is lifted, the retractor does not wind up the traction rope. The pulley block 6 is set with an amplification factor based on the preset height to which the girder erecting crane 7 will be lifted, so that when the girder erecting crane 7 is lifted to the preset height, the ballast car 1 moves a set distance on the beam surface according to the amplification factor. This design ensures that after the girder erecting crane 7 is lifted to the preset height, the ballast car 1 will move according to the predetermined distance, thus achieving precise control of the bending moment at the cantilever end of the bridge.

[0061] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A device for the overall dismantling of a girder erection crane for a cable-stayed bridge in a double cantilever configuration, characterized in that, include: Lifting device, which is used to lift the girder crane located at the cantilever end of the double cantilever beam (7). Pressure sensor, which is used to monitor the pressure change on the beam surface when the girder crane (7) lifts it; The counterweight vehicle (1) is used to be set on the beam surface (2) of the cantilever where the girder erecting crane (7) is located, and is set close to the main tower; A control device, which is connected to the pressure sensor and the counterweight vehicle signal, is used to receive the signal from the pressure sensor and control the counterweight vehicle to move toward the beam-erecting crane (7) according to the pressure change signal from the pressure sensor. The pulley system includes a traction rope (5), a pulley block (6), and a winding machine. The fixed pulley end (61) of the pulley block (6) is used to fix it on the beam surface (2), and the movable pulley end (62) of the pulley block (6) is used to connect with the beam erecting crane (7). One end of the traction rope (5) is used to connect with the beam surface (2), and the winding machine is installed on the counterweight vehicle (1). The other end of the traction rope (5) passes around the pulley block (6) and is connected to the winding machine. When the ballast cart (1) is located on the beam surface (2), the traction rope (5) between the pulley block (6) and the ballast cart (1) is parallel to the beam surface (2); Before the gantry crane (7) lifts the beam, the traction rope is wound up by a winding machine installed on the ballast car (1) during the graded loading and movement of the ballast car (1). When the gantry crane (7) lifts the load for the current load and the ballast car (1) moves, the winding machine does not work. The pulley block (6) is set with an amplification factor to move the ballast car (1) according to the preset height to which the gantry crane (7) is lifted, so that when the gantry crane (7) is lifted to the preset height, the ballast car (1) moves a set distance on the beam surface according to the amplification factor.

2. The overall dismantling device for the cable-stayed bridge double cantilever girder erection crane as described in claim 1, characterized in that: It also includes a limiting baffle (3), which is set on the beam surface (2) at the stop position of the ballast car (1).

3. The overall dismantling device for the cable-stayed bridge double cantilever girder erection crane as described in claim 2, characterized in that: The stopping position of the ballast car (1) is determined based on the formula X=(M1g*L1-M2g*L2) / M2g, where M1 is the mass of the girder erecting crane (7), L1 is the distance between the girder erecting crane (7) and the center of the main tower, L2 is the distance between the initial position of the ballast car (1) and the center of the main tower, M2 is the full-load mass of the ballast car (1), and g is the acceleration due to gravity.

4. The overall dismantling device for the cable-stayed bridge double cantilever girder erection crane as described in claim 3, characterized in that: The moving speed of the ballast cart (1) is based on the formula: V=[(F i *L1-M2g*L2) / M2g] / t is determined, where t is the unloading time, F i Let be the unloading force for the i-th time.

5. The overall dismantling device for the cable-stayed bridge double cantilever girder erection crane as described in claim 1, characterized in that: It also includes an inclined ramp (4), which is located at the initial position of the ballast car (1) and below the ballast car (1).

6. A method for the overall dismantling of a girder erection crane for a cable-stayed bridge in a double cantilever configuration, wherein the method is implemented using the overall dismantling device for a girder erection crane in a double cantilever configuration as described in any one of claims 1-5, characterized in that... Includes the following steps: The lifting and erecting crane (7) is used to monitor the pressure changes on the beam surface when the lifting and erecting crane (7) is used; Based on the pressure change signal from the pressure sensor, the counterweight vehicle (1) moves on the beam surface toward the girder crane (7) based on the pressure change signal.

7. The method for overall dismantling of a cable-stayed bridge double cantilever girder erection crane as described in claim 6, characterized in that: When lifting the girder erecting crane (7), the lifting device adopts a staged loading method on the girder erecting crane (7), and the stopping position of the counterweight vehicle (1) after each stage of loading is based on formula X. i =(F i *L1-M2g*L2) / M2g is determined, F i For the loading of the lifting device, L1 is the distance between the girder crane (7) and the center of the main tower, L2 is the distance between the initial position of the ballast car (1) and the center of the main tower, M2 is the full load mass of the ballast car (1), and g is the acceleration due to gravity.

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