Self-locking I-beam hoisting positioning method

Abstract

The application relates to a self-locking I-beam hoisting positioning method, a first hoist is installed on an installed I-beam section, a second hoist is installed on an I-beam section to be installed, a hoisting machine is connected with the second hoist, both the hoists are buckle type structures, the I-beam section to be installed is hoisted to a mounting position, two positioning rods are penetrated between the two hoists, adjusting nuts are installed at two ends of each positioning rod, and the position of the I-beam section to be installed is finely adjusted through the adjusting nuts; then the hoisting machine is disconnected with the hoists, and the I-beam section to be installed is welded with the installed I-beam section. The buckle type hoist I-beam hoisting efficiency and safety are high, after hoisting to the position, the position of the I-beam is finely adjusted and locked through the adjusting nuts and the positioning rods, the welding process does not depend on the hoisting machine, the hoisting machine occupation time can be reduced, a welding template is not needed, and the I-beam can be prevented from being damaged.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology and relates to the hoisting construction of steel beams with I-shaped cross sections, specifically to a self-locking I-beam hoisting and positioning method. Background Technology

[0002] The steel beams of a steel-concrete composite cable-stayed bridge are truss structures, consisting of two main longitudinal beams running along the bridge direction. Multiple crossbeams connect the two main longitudinal beams, and smaller longitudinal beams connect adjacent crossbeams. All main longitudinal beams, crossbeams, and smaller longitudinal beams are I-beams. During cable-stayed bridge construction, the steel beams are typically installed in segments. When the water beneath the bridge is suitable for navigation, the beam segments can be transported by water and then lifted and installed entirely by large lifting equipment such as floating cranes. However, when the water beneath the bridge is land or transportation conditions are limited, a segmental assembly process is used. Each segment's main longitudinal beams, crossbeams, and smaller longitudinal beams are lifted sequentially using a bridge crane. After each component is lifted to its designed installation position, it is welded to the already installed components before the next component is lifted.

[0003] Currently, during the assembly of steel beams, steel wire ropes or slings are typically used to bind and lift the I-beam components. However, the I-beams are prone to slipping in the air. When welding them to the installed components after lifting them into place, one method is to keep the crane in the lifting state throughout the entire process until the welding is completed. This method takes too long and relies solely on manual crane operation, making it difficult to control the positioning accuracy of the I-beams. Another method is to weld a mounting plate between the two connecting components and then remove the mounting plate after welding. However, this method damages the coating layer on the beam surface. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a self-locking I-beam hoisting and positioning method, which improves the safety and docking accuracy of truss beams during aerial assembly and hoisting, and avoids damage to the steel beams.

[0005] The technical solution of the present invention is as follows:

[0006] A method for hoisting and positioning a self-locking I-beam, characterized by the following steps:

[0007] (1) Install the first lifting device on the installed I-beam segment: The first lifting device includes two clamping plates, the upper ends of the two clamping plates are rotatably connected by a pin, and each clamping plate has a slot near the lower end. The width of the slot is greater than or equal to the thickness of the upper flange of the I-beam. The slots of the two clamping plates are opposite each other, and a screw hole is provided in the middle of each clamping plate; the slots of the two clamping plates of the first lifting device are respectively clamped on both sides of the upper flange of the installed I-beam segment.

[0008] (2) Lifting the I-beam to be installed: Install the second lifting device on the I-beam section to be installed. The structure of the second lifting device is the same as that of the first lifting device. Insert the slots on the two plates of the second lifting device into the upper flange plates of the I-beam to be installed on both sides. Connect the second lifting device with a crane and lift the I-beam section to be installed to the docking position with the installed I-beam.

[0009] (3) Insert positioning rods into the screw holes of the two lifting tools. The diameter of the positioning rods is equal to the diameter of the screw holes. Install adjusting nuts at both ends of each positioning rod. Adjust the position of the I-beam section to be installed by rotating the adjusting nuts so that the gap between the I-beam to be installed and the installed I-beam meets the requirements of the butt weld width.

[0010] (4) The crane is unhooked from the lifting device, and the force system is transformed. The weight of the I-beam segment to be installed is entirely borne by the positioning rod.

[0011] (5) Weld the I-beam segment to be installed to the already installed I-beam segment;

[0012] (6) Release the positioning rod between the two lifting tools, remove the first lifting tool, use the first lifting tool to lift the next I-beam to be installed, and repeat the lifting of subsequent I-beam segments in steps (2) to (5).

[0013] This invention utilizes the characteristic that the main longitudinal beams, cross beams, and minor longitudinal beams of the truss beam are all I-beams. It employs a snap-on lifting device to lift the I-beams, resulting in high lifting efficiency and safety. After being lifted into position, a positioning screw is inserted between the two lifting devices, and the position of the I-beam is finely adjusted and locked by adjusting the nut. During the welding process, the weight of the I-beam is borne by the positioning rod, which does not rely on the crane, thus reducing the time occupied by the bridge deck crane. It also eliminates the need for welding plates, avoiding damage to the coating layer on the surface of the I-beam. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing the lifting state of the I-beam according to the present invention;

[0015] Figure 2 This is a schematic diagram of the lifting device used in this invention;

[0016] Figure 3 This is a schematic diagram of the self-locking positioning of the I-beam according to the present invention. Detailed Implementation

[0017] The specific embodiments of the present invention are as follows:

[0018] (1) As Figure 1 As shown, the first lifting device 2 is installed on the already installed I-beam segment 1: the structure of the first lifting device 2 is as follows. Figure 2As shown, it includes two clamping plates 21, the upper ends of the two clamping plates 21 are rotatably connected by a pin 22, and each clamping plate has a slot 23 near its lower end. The width of the slot is greater than or equal to the thickness of the upper flange of the I-beam. The slots 23 of the two clamping plates 21 are opposite each other, and a screw hole 24 is provided in the middle of each clamping plate. The slots of the two clamping plates 21 of the first lifting tool are respectively clamped on both sides of the upper flange of the installed I-beam segment 1.

[0019] (2) Lifting the I-beam to be installed: Install the second lifting device 4 on the I-beam segment 3 to be installed. The structure of the second lifting device 4 is the same as that of the first lifting device. Insert the slots on the two plates of the second lifting device into the upper flange plates of the I-beam to be installed on both sides. Connect the second lifting device with a crane and lift the I-beam segment 3 to be installed to the docking position with the installed I-beam 1. During the lifting process, the two plates of the second lifting device will automatically lock the I-beam under the weight of the I-beam to prevent the I-beam from sliding.

[0020] (3) Insert positioning rods 5 into the screw holes of the two lifting tools. The diameter of the positioning rods is equal to the diameter of the screw holes. Install adjusting nuts 6 at both ends of each positioning rod 5. Adjust the position of the I-beam segment 3 to be installed by rotating the adjusting nuts 6 so that the gap between the I-beam segment 3 to be installed and the installed I-beam 1 meets the requirements of the butt weld width.

[0021] (4) The crane is unhooked from the lifting device, so that the weight of the I-beam segment 3 to be installed is completely borne by the positioning rod 5, thus completing the conversion of the force system.

[0022] After the crane is unhooked, the diameter of the positioning rod is equal to the diameter of the screw hole, which prevents the I-beam from moving laterally, thus keeping the longitudinal axis of the two I-beams in a straight line. Moreover, due to the limiting effect of the adjusting nut, the I-beam can be kept in a fixed position in the longitudinal direction, thereby ensuring that the position of the I-beam to be installed is locked.

[0023] (5) Weld the I-beam segment 3 to be installed to the already installed I-beam segment 1 to complete the installation of the I-beam segment to be installed.

[0024] (6) Release the positioning rod 5 between the two lifting tools, remove the first lifting tool 1, use the crane and the first lifting tool to lift the next I-beam to be installed, and repeat the lifting of subsequent I-beam segments in steps (2) to (5).

Claims

1. A method for hoisting and positioning a self-locking I-beam, characterized in that, Includes the following steps: (1) Install the first lifting device on the installed I-beam segment: The first lifting device includes two clamping plates, the upper ends of the two clamping plates are rotatably connected by a pin, and each clamping plate has a slot near the lower end. The width of the slot is greater than or equal to the thickness of the upper flange of the I-beam. The slots of the two clamping plates are opposite each other, and a screw hole is provided in the middle of each clamping plate; the slots of the two clamping plates of the first lifting device are respectively clamped on both sides of the upper flange of the installed I-beam segment. (2) Lifting the I-beam to be installed: Install the second lifting device on the I-beam section to be installed. The structure of the second lifting device is the same as that of the first lifting device. Insert the slots on the two plates of the second lifting device into the upper flange plates of the I-beam to be installed on both sides. Connect the second lifting device with a crane and lift the I-beam section to be installed to the docking position with the installed I-beam. (3) Insert positioning rods into the screw holes of the two lifting tools. The diameter of the positioning rods is equal to the diameter of the screw holes. Install adjusting nuts at both ends of each positioning rod. Adjust the position of the I-beam section to be installed by rotating the adjusting nuts so that the gap between the I-beam to be installed and the installed I-beam meets the requirements of the butt weld width. (4) The crane is unhooked from the lifting device, and the force system is transformed. The weight of the I-beam segment to be installed is entirely borne by the positioning rod. (5) Weld the I-beam segment to be installed to the already installed I-beam segment; (6) Release the positioning rod between the two lifting tools, remove the first lifting tool, use the first lifting tool to lift the next I-beam to be installed, and repeat the lifting of subsequent I-beam segments in steps (2) to (5).

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