Suspension bridge deck steel beam cable hoisting equipment

Abstract

The invention relates to the technical field of bridge engineering construction, and particularly discloses suspension bridge deck steel beam cable hoisting equipment which comprises a sports car, a hoisting tool and a hoisting cable, the hoisting tool is used for being connected with a steel beam, the sports car is installed on a bearing cable and can move on the bearing cable, the hoisting tool is connected with the sports car through the hoisting cable, a pulley seat is arranged on the hoisting cable, and a connecting seat is arranged on the hoisting tool. The pulley seat and the connecting seat are hinged through a pin shaft to form four lifting points, the hoisting cable is connected with the hoisting winch, the pin shaft is provided with a pin shaft type force sensor used for measuring the cable force of the hoisting cable, cable force data are detected and transmitted to a control center, and a Beidou positioning terminal is arranged near the lifting points. In the hoisting process, coordinate data of the hoisting points are collected in real time and transmitted to the control center, the control center processes the cable force data and the coordinate data of the hoisting points and controls the hoisting winches to work according to the processing result, the actions of all the hoisting winches are adjusted to enable the steel beam to be kept balanced, and stable and safe construction is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering construction, in particular to cable hoisting equipment for steel beams on a suspension bridge deck. Background Art

[0002] During suspension bridge construction, deck steel beams are typically installed by hoisting. Cable cranes are used to lift the beams to the bridge deck height and connect them to the suspenders. Because a single beam segment can weigh over 200 tons, a multi-point hoisting method is used to ensure stable and safe installation. Multiple hoists are used to provide the lifting force. However, poor synchronization between the hoists can cause different vertical displacements at each hoisting point, resulting in unbalanced beam segments. With the development of Beidou positioning technology, it has been gradually applied in various positioning scenarios, including the hoisting and positioning of bridge steel crossbeams. For example, patent publication number CN219929461U discloses a cable hoisting and positioning device for suspension bridges. By incorporating Beidou technology, Beidou obtains real-time height data during the hoisting process, allowing the hoist to promptly adjust the height and posture of the steel truss. Since this adjustment method uses the results as the basis for adjustment, if the imbalance of the steel truss during the transfer process is caused by the friction of the lifting ropes, this imbalance factor will persist. Moreover, due to the signal delay and accuracy error of the Beidou signal, the deviation caused by it will not be eliminated immediately and will accumulate within its delay and accuracy error. Therefore, there will be repeated leveling during the transportation process, which will cause the steel truss to vibrate during the lifting process, increasing safety hazards.

[0003] Currently, the process of lifting a suspension bridge steel truss from its lifting point to its connection to the hanger and the completion of temporary riveting with adjacent steel trusses is typically accomplished by a cable crane. During the transfer process from the cable crane to the final connection with the hanger, the balance of the steel beam should be maintained as much as possible. This allows for minimal adjustments to the steel truss during the final docking of adjacent steel trusses, thereby improving docking efficiency. To maintain the balance of the steel truss during the lifting process and facilitate adjustments during docking, the hoisting equipment used to lift the steel truss is typically equipped with multiple lifting points. Specifically, the lifting equipment is equipped with multiple load-bearing points. Multiple lifting ropes extending from the cable crane carriage are connected to the lifting points. The balance of the steel beam can be adjusted by adjusting the lifting speed of each lifting point. When the steel truss is lifted, the lifting ropes are adjusted to maintain the initial balance of the steel truss. During transport, manual adjustments are only made when the steel truss is significantly unbalanced. Once the steel truss reaches the docking range, the relationship between the truss and adjacent steel trusses is manually observed, and each lifting point is controlled to achieve the desired balance. In addition, to ensure that each rope is evenly stressed during lifting, a tension sensor is installed at the fixed end of the rope to monitor the tension on the rope. During transportation, even when the steel truss maintains balance, the rope connected to a certain lifting point may not be under stress, causing the other ropes to be overloaded, resulting in safety hazards. Although the rope not only bears the weight of the steel truss, the tension on the rope is also affected by factors such as friction with the pulley and the jamming force. Since the friction force is much smaller than the weight of the steel truss and the friction force is proportional to the weight shared by the rope, it is impossible to judge the friction force on a certain rope as sharing the weight of the steel truss when it is not under stress. Therefore, in the existing technology, based on the premise of judging the safety of the rope, installing a tension sensor on the rope to directly obtain the tension value of the rope is still the best choice. During the lifting process, the sling will slide between multiple pulleys and generate friction, resulting in a decrease in measurement accuracy and large control errors of the lifting winch. The existing technology cannot use the cable tension sensor and Beidou positioning in combination to adjust the balance of the steel beam lifting process. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the technical problem solved by the present invention is to provide a cable lifting device for the steel beam of the suspension bridge deck, so as to solve the problem of imbalance of the hoisted steel beam caused by the low measurement accuracy of the hoisting height and the tension sensor during the hoisting process of the existing cable crane.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a cable lifting device for the steel beam of a suspension bridge deck, including a sports car, a hoist and a lifting cable, the hoist is used to connect the steel beam, the sports car is installed on the load-bearing cable and can move on the load-bearing cable, the hoist is connected to the sports car through the lifting cable, the lifting cable is provided with a pulley seat, the hoist is provided with a connecting seat, the pulley seat and the connecting seat are hinged with a pin shaft to form a lifting point, there are four lifting points, the lifting cable is connected to the lifting winch, and the pin shaft is provided with a pin shaft type force sensor for measuring the rope force of the lifting cable, and the detected rope force data is transmitted to the control center, a Beidou positioning terminal is provided near the lifting point, and the coordinate data of the lifting point is collected in real time during the lifting process and transmitted to the control center, the control center processes the rope force data and the coordinate data of the lifting point and controls the operation of the lifting winch according to the processing results.

[0006] Furthermore, the sling includes a crossbeam, a crossbar and a connecting seat. There are two crossbars that are arranged in parallel. The crossbeam connects the two crossbars into one. The crossbeam is perpendicular to the crossbar. A connecting seat is fixed at both ends of each crossbar. The connecting seat includes two vertical vertical plates. The pulley seat on the lifting cable includes a connecting block. The vertical plate and the connecting block are hinged by a pin shaft to form a lifting point. The Beidou positioning terminal is installed on the crossbar near the lifting point.

[0007] Furthermore, the sports car is provided with a traction rope connected to the winch, and the sports car moves along the load-bearing rope under the traction of the traction rope, and the load-bearing rope is a parallel load-bearing rope.

[0008] Furthermore, there are four Beidou positioning terminals, and the four Beidou positioning terminals are located on the same horizontal plane.

[0009] Furthermore, the vertical plate and the connecting block are provided with pin holes for installing pin shafts.

[0010] Furthermore, the measuring range of the pin-type force sensor is 0-2000kN.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The hoisting equipment is equipped with four lifting points, each of which is equipped with a pin-type force sensor. This prevents the friction between the lifting cable and the pulley from affecting the detection accuracy during the steel beam lifting process, greatly improving the cable force detection accuracy. This is conducive to controlling the operation of the lifting winch to adjust the balance of the steel beam. When the data is normal, the control center sends a coordinated control command to the lifting winch to ensure that all lifting points are lifted synchronously. When the data is abnormal, the lifting winch corresponding to the abnormal lifting point is controlled to adjust the cable force to the normal value, dynamically adjusting the lifting balance of the steel beam. 2. Four Beidou positioning terminals are installed on the hoist to collect data such as the vertical displacement, height difference and lifting speed of each lifting point. Compared with the traditional encoder error of 3-5 cm, the measurement accuracy is improved, and the positioning error is ≤2 mm. For example, in the hoisting of steel trusses with a span of more than 500 meters, the main beam docking error is reduced from 15 mm in traditional processes to within 5 mm. Combined with the cable force data detected by the pin-type force sensor, the lifting winches connected to each lifting point are controlled to adjust the lifting height and speed to keep the steel beam balanced during the hoisting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A magnified schematic diagram of point A; Figure 3 It is a top view schematic diagram of the spreader of the present invention; Figure 4 It is a control schematic diagram of the present invention; In the figure: 1- sports car, 2- sling, 3- lifting rope, 4- pin-type force sensor, 5- Beidou positioning terminal, 21- crossbeam, 22- crossbar, 23- vertical plate, 6- connecting block. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] Implementation example Figures 1 to 4As shown: the cable lifting equipment for the steel beam of the suspension bridge deck includes a sports car 1, a sling 2 and a lifting cable 3. The sling 2 is used to connect the steel beam. The sports car 1 is installed on the load-bearing cable and can move on the load-bearing cable. The sling 2 is connected to the sports car 1 through the lifting cable 3. A pulley seat is provided on the lifting cable 3, and a connecting seat is provided on the sling 2. The pulley seat and the connecting seat are hinged with a pin shaft to form a lifting point. There are four lifting points. The lifting cable 3 is connected to the lifting winch. A pin shaft type force sensor 4 for measuring the cable force of the lifting cable 3 is provided on the pin shaft. The pin shaft type force sensor 4 can choose a strain gauge sensor with high measurement accuracy and convenient installation and disassembly. The cable force data is transmitted to the control center. When the steel beam is hoisted, the force is applied at the lifting point. The pin shaft type force sensor 4 is arranged at the lifting point to avoid In order to avoid the friction between the lifting rope 3 and the pulley affecting the detection accuracy, the detection accuracy of the lifting rope 3 is effectively improved. Four Beidou positioning terminals 5 are arranged near the lifting point, and the four Beidou positioning terminals 5 are located in the same horizontal plane. During the lifting process, the coordinate data of the lifting point is collected in real time and transmitted to the control center. The Beidou positioning terminal 5 collects the coordinate data of the four lifting points in real time, including the X, Y, and Z axis coordinates, and transmits them to the Beidou differential service system. The Beidou differential service system calculates the coordinates of the four lifting points and transmits the data to the control center. The control center processes the data and calculates the vertical displacement, height difference and lifting speed of the four lifting points. The control center processes the cable force data and the coordinate data of the lifting points and controls the operation of the lifting winch according to the processing results.

[0015] The sports car 1 is provided with a traction rope connected to the winch. The sports car 1 moves along the load-bearing rope under the traction of the traction rope, and the horizontal position of the steel beam is adjusted during the lifting process. The hoist 2 includes a crossbeam 21, a crossbar 22 and a connecting seat. There are two crossbars 22 and they are arranged in parallel. The crossbeam 21 connects the two crossbars 22 into one. The crossbeam 21 is perpendicular to the crossbar 22. A connecting seat is fixed at both ends of each crossbar 22. The connecting seat includes two vertical vertical plates 23. The pulley seat on the lifting cable 3 includes a connecting block 6. Pin holes are provided on the vertical plates 23 and the connecting block 6. The pin shaft is installed in the pin hole so that the vertical plate 23 and the connecting block 6 are hinged to form a lifting point. The pin shaft type force sensor 4 is installed on the pin shaft to measure the cable force of the lifting point. The range of the pin shaft type force sensor 4 is 0-2000kN, which can accurately detect the cable force of the lifting cable 3.

[0016] The specific implementation process is as follows: The sling 2 is firmly connected to the steel beam, and the hoisting winch starts to hoist. The balance error of the steel beam is preset in the control center, including the force error of the lifting point and the height error. At the beginning of hoisting, the steel beam is initially leveled, and the cable force of each lifting point is obtained by the pin-type force sensor 4, and the beam is hoisted to a state where each lifting point is evenly stressed. During the hoisting process, the force value of the pin-type force sensor 4 is obtained in real time, and compared in real time to maintain it within the error range of uniform force. The Beidou data of each lifting point is obtained in real time, and the state of the steel beam is obtained by comparing the height data. The state of the steel beam is balanced if it is within the balance error, and unbalanced if it is greater than the error. In the unbalanced state, the steel beam is controlled to a balanced state by the hoisting winch. After the steel beam reaches the predetermined horizontal position, the hoisting winch is controlled to lift the steel beam to a preset height position. During the leveling and lifting process, priority should be given to ensuring that each lifting point is evenly stressed. The data of the force sensor 4 and the Beidou positioning terminal 5 are coordinated to control the operation of the hoisting winch, maintain the balanced and stable state of the steel beam hoisting, and ensure smooth and safe construction.

[0017] An alarm device and a visual monitoring center can also be set up to connect with the control center. When the vertical displacement, height difference, lifting speed and cable force data of the four lifting points exceed the threshold, the alarm device will be triggered to facilitate timely processing by construction personnel. The visual monitoring center can display the data of the four lifting points and the status of the steel beam in real time.

[0018] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Cable hoisting equipment for suspension bridge deck steel beams, including a carriage, a hoist, and a lifting cable. The lifting cable is used to connect the steel beams, the carriage is mounted on and movable on the load-bearing cable, and the hoist is connected to the carriage via the lifting cable. The equipment is characterized by: A pulley seat is provided on the lifting cable, and a connecting seat is provided on the sling. The pulley seat and the connecting seat are hinged with a pin to form a lifting point. There are four lifting points. The lifting cable is connected to the lifting winch. A pin-type force sensor for measuring the cable force of the lifting cable is provided on the pin. The detected cable force data is transmitted to the control center. A Beidou positioning terminal is provided near the lifting point. During the lifting process, the coordinate data of the lifting point is collected in real time and transmitted to the control center. The control center processes the cable force data and the coordinate data of the lifting point and controls the operation of the lifting winch according to the processing results.

2. The cable hoisting equipment for the steel beam of a suspension bridge deck according to claim 1, characterized in that: The sling includes a crossbeam, a crossbar and a connecting seat. There are two crossbars that are arranged in parallel. The crossbeam connects the two crossbars into one. The crossbeam is perpendicular to the crossbar. A connecting seat is fixed at both ends of each crossbar. The connecting seat includes two vertical vertical plates. The pulley seat on the lifting cable includes a connecting block. The vertical plate and the connecting block are hinged by a pin shaft to form a lifting point. The Beidou positioning terminal is installed on the crossbar near the lifting point.

3. The cable hoisting equipment for the steel beam of a suspension bridge deck according to claim 1, characterized in that: The sports car is provided with a traction rope connected to a winch, and the sports car moves along the load-bearing rope under the traction of the traction rope, and the load-bearing rope is a parallel load-bearing rope.

4. The cable hoisting equipment for the steel beam of a suspension bridge deck according to claim 1, characterized in that: There are four Beidou positioning terminals, and the four Beidou positioning terminals are located on the same horizontal plane.

5. The cable hoisting equipment for the steel beam of a suspension bridge deck according to claim 2, characterized in that: Pin holes for installing pin shafts are provided on the vertical plates and the connecting blocks.

6. The cable hoisting equipment for the steel beam of a suspension bridge deck according to claim 1, characterized in that: The measuring range of the pin-type force sensor is 0-2000kN.

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