CN-115924744-B - Integral dismantling device and method for double-cantilever working condition girder erection crane of cable-stayed bridge

Abstract

The invention relates to the technical field of bridge construction, in particular to a device and a method for integrally dismantling a double-cantilever working condition girder erection crane of a cable-stayed bridge. The whole dismantling device of the double-cantilever working condition girder erection crane of the cable-stayed bridge comprises a hoisting device, a pressure sensor, a pressure truck and a control device. The device comprises a lifting device, a pressure sensor, a weight vehicle, a control device and a control device, wherein the lifting device is used for lifting the girder crane, the pressure sensor is used for monitoring pressure change on a girder surface when the girder crane is lifted, the weight vehicle is arranged on the girder surface of a cantilever where the girder crane is arranged and is close to a main tower, and the control device is connected with the pressure sensor and the weight vehicle through signals and used for receiving signals of the pressure sensor and controlling the weight vehicle to move towards the girder crane according to the pressure change signals of the pressure sensor. The beam erecting crane can solve the problems that in the prior art, the beam erecting crane is used for disassembling rod pieces one by one, and then the beam erecting crane is transported out of a construction site, so that the construction period is longer, and the time-consuming danger coefficient is high.

Inventors

• WANG ZIYU
• XU JIN
• GAO TIAN
• LI HONGYOU
• YI JIANJUN
• YAN HAN
• LI LI
• WANG XIANG
• DENG YONGFENG
• WANG BO
• ZHONG JIWEI
• PENG XUMIN
• LI LINLIN
• CHEN XIAOJIAN
• JIANG HAIMING

Assignees

• 中铁大桥局集团有限公司
• 中铁大桥科学研究院有限公司

Dates

Publication Date

20260505

Application Date

20221223

Claims (7)

1. 1. The utility model provides a whole demolishs device of two cantilever operating mode frame roof beam loop wheel machines of cable-stayed bridge which characterized in that includes: The lifting device is used for lifting a cantilever crane (7) positioned at the upper cantilever end of the double-cantilever beam; a pressure sensor for monitoring pressure changes to the girder surface when the girder erection crane (7) is hoisted; the weight pressing vehicle (1) is arranged on a beam surface (2) of a cantilever where the beam erecting crane (7) is positioned and is close to the main tower; The control device is in signal connection with the pressure sensor and the weight truck, and is used for receiving the signal of the pressure sensor and controlling the weight truck to move towards the girder erection crane (7) according to the pressure change signal of the pressure sensor; The pulley block comprises a traction rope (5), a pulley block (6) and a rolling machine, wherein a fixed pulley end (61) of the pulley block (6) is used for being fixed on a beam surface (2), a movable pulley end (62) of the pulley block (6) is used for being connected with a girder erection crane (7), one end of the traction rope (5) is used for being connected with the beam surface (2), the rolling machine is arranged on the weight-pressing car (1), and the other end of the traction rope (5) bypasses the pulley block (6) and is connected with the rolling machine; when the weight vehicle (1) is positioned on the beam surface (2), a traction rope (5) between the pulley block (6) and the weight vehicle (1) is parallel to the beam surface (2); When the crane (7) is loaded in a grading manner before being lifted, the weight vehicle (1) moves, and the traction rope is reeled by a reeler arranged on the weight vehicle (1); When the girder erection crane (7) is hoisted for loading, and the weight vehicle (1) moves, the rolling machine does not work, and the amplification factor of the pulley block (6) for moving the weight vehicle (1) is set according to the preset height for hoisting the girder erection crane (7), so that when the girder erection crane (7) is hoisted for the preset height, the weight vehicle (1) is driven to move on a girder surface for a set distance according to the amplification factor.
2. 2. The device for integrally dismantling the double-cantilever-condition girder erection crane of the cable-stayed bridge according to claim 1 is characterized by further comprising a limit baffle (3) which is arranged on the girder surface (2) and is positioned at the stop position of the ballast car (1).
3. 3. The device for integrally dismantling the girder erection crane under the double-cantilever working condition of the cable-stayed bridge according to claim 2, wherein the stopping position of the weight wagon (1) is determined based on a formula X= (M 1 g*L 1 -M 2 g*L 2 )/M 2 g, M 1 is the mass of the girder erection crane (7), L 1 is the distance between the girder erection crane (7) and the center of a main tower, L 2 is the distance between the initial position of the weight wagon (1) and the center of the main tower, M 2 is the full-load mass of the weight wagon (1), and g is the gravity acceleration.
4. 4. The device for integrally dismantling a double-cantilever-condition girder erection crane of a cable-stayed bridge according to claim 3, wherein the moving speed of the weight wagon (1) is determined based on the formula V= [ (F i *L 1 -M 2 g*L 2 )/M 2 g ]/t), wherein t is unloading time and F i is the ith unloading force.
5. 5. The device for integrally dismantling the double-cantilever-condition girder erection crane of the cable-stayed bridge according to claim 1 is characterized by further comprising an inclined plane (4) which is arranged at the initial position of the weight wagon (1) and is positioned below the weight wagon (1).
6. 6. A method for integrally dismantling a double-cantilever working condition girder erection crane of a cable-stayed bridge, which is implemented by using the double-cantilever working condition girder erection crane integral dismantling device of the cable-stayed bridge according to any one of claims 1 to 5, and is characterized by comprising the following steps: hoisting a girder erection crane (7), and simultaneously monitoring pressure change on a girder surface when hoisting the girder erection crane (7); according to the pressure change signal of the pressure sensor, the weight vehicle (1) is moved to the girder erection crane (7) on the girder surface based on the pressure change signal.
7. 7. The method for integrally dismantling the double-cantilever-condition girder erection crane of the cable-stayed bridge as claimed in claim 6, wherein the method comprises the following steps: When the girder crane (7) is lifted, the lifting device is implemented in a mode of loading the girder crane (7) in a grading manner, the stop position of the ballast car (1) after each stage of loading is determined based on a formula X i =(F i *L 1 -M 2 g*L 2 )/M 2 g, F i is the loading of the lifting device, L 1 is the distance between the girder crane (7) and the center of the main tower, L 2 is the distance between the initial position of the ballast car (1) and the center of the main tower, M 2 is the full-load mass of the ballast car (1), and g is the gravity acceleration.

Description

Integral dismantling device and method for double-cantilever working condition girder erection crane of cable-stayed bridge Technical Field The invention relates to the technical field of bridge construction, in particular to a device and a method for integrally dismantling a double-cantilever working condition girder erection crane of a cable-stayed bridge. Background The beam surface crane mainly comprises a metal structure assembly, a lifting mechanism assembly, a lifting appliance, an amplitude variation and traversing mechanism, a movable anchoring and supporting mechanism, a ladder platform assembly, an electrical system, a hydraulic system, a counterweight and the like. Site installation position of girder erection crane and is positioned at the outermost side of the cantilever bridge. The traditional cable-stayed bridge girder erection crane construction adopts a method of sectional dismantling, after the girder erection construction process is finished, the girder erection crane is dismantled one by utilizing the crane, and then the girder erection crane is transported out of a construction site. However, the construction period of the method is long, the organization disassembly work consumes a large amount of labor, and the risk coefficient is high. Disclosure of Invention Aiming at the defects in the prior art, the invention aims to provide a device and a method for integrally dismantling a girder erection crane under a double-cantilever working condition of a cable-stayed bridge, which can solve the problems that in the prior art, the girder erection crane is dismantled one by utilizing the crane, and then transported out of a construction site, so that the construction period is long, and the time-consuming danger coefficient is high. In order to achieve the above purpose, the invention adopts the following technical scheme: in one aspect, the invention provides a device for integrally dismantling a double-cantilever working condition girder erection crane of a cable-stayed bridge, which comprises: A lifting device for lifting the girder crane; A pressure sensor for monitoring pressure change to the girder surface when the girder erection crane is hoisted; the weight pressing vehicle is used for being arranged on the beam surface of the cantilever where the beam erecting crane is arranged and is close to the main tower; And the control device is in signal connection with the pressure sensor and the weight truck, and is used for receiving the signals of the pressure sensor and controlling the weight truck to move towards the girder erection crane according to the pressure change signals of the pressure sensor. In some alternatives, the apparatus further comprises a limit stop for placement on the beam face at a stop position of the truck. In some alternatives, the stopping position of the weight wagon is determined based on the formula x= (M 1g*L1-M2g*L2)/M2 g, M 1 is the mass of the girder crane, L 1 is the distance of the girder crane from the main tower center, L 2 is the distance of the initial position of the weight wagon from the main tower center, M 2 is the full load mass of the weight wagon, g is the gravitational acceleration. In some alternatives, the speed of movement of the truck is determined based on the formula V= [ (F i*L1-M2g*L2)/M2 g ]/t, where t is the unload time and F i is the ith unload force. In some alternatives, the apparatus further comprises a sloped ramp disposed at an initial position of the weight carriage and below the weight carriage. In some alternative schemes, the device further comprises a traction rope, a pulley block and a winding machine, wherein the fixed pulley end of the pulley block is used for being fixed on a beam surface, the movable pulley end of the pulley block is used for being connected with a beam erecting crane, one end of the traction rope is used for being connected with the beam surface, the winding machine is arranged on the pressing and rewinding vehicle, and the other end of the traction rope is connected with the winding machine after bypassing the pulley block. In some alternative solutions, when the ballast car is positioned on the beam surface, the traction rope between the pulley block and the ballast car is parallel to the beam surface. On the other hand, the invention also provides a method for integrally dismantling the double-cantilever working condition girder erection crane of the cable-stayed bridge, which is implemented by using the device for integrally dismantling the double-cantilever working condition girder erection crane of the cable-stayed bridge, and is characterized by comprising the following steps: hoisting the girder crane and simultaneously monitoring the pressure change of the girder surface when hoisting the girder crane; And according to the pressure change signal of the pressure sensor, the weight truck is enabled to move to the girder erection crane on the girder surface based on the pressure change signa