Construction method for traction climbing of large joist barrow on slope beam

Abstract

The invention belongs to the technical field of large crane beam reconstruction engineering construction in metallurgical projects, and particularly relates to a construction method for traction climbing of a large joist barrow on a slope beam, which is characterized by comprising the steps of slope beam manufacturing, slope beam installation, winch traction system arrangement and joist barrow traction. Seven operators are dispatched for operation until the truss car is dragged to the second crane beam with the high elevation from the first crane beam with the low elevation through the winch traction system. Compared with the prior art, the method has the advantages that an original construction technology is creatively changed, a large truss car is dragged from a low-elevation crane beam to a high-elevation crane beam through a winch traction system, so that the hoisting height of the truss car is increased, powerful support is provided for upgrading and reconstruction of a production line, cost is low, the construction period is short, and larger economic benefits are brought to enterprises; and 2) the whole construction process is feasible, safe and reliable, and beneficial reference can be provided for similar construction occasions.

Description

Technical Field

[0001] The invention belongs to the technical field of construction of large crane beam reconstruction projects in metallurgical projects, and in particular relates to a construction method for a large gantry crane to tow and climb a slope beam. Background Art

[0002] A steelmaking facility underwent a renovation project to upgrade the crane beams in the DE and EF spans. The renovation required increasing the casting arc radius from 5 meters to 9 meters. However, the crane beams supporting nine cranes above the casting machine were not high enough due to their original design. The crane beams in the new plant were raised 1700mm higher than those in the adjacent spans of the old plant. Due to the elevation difference between the new and existing crane beams, large gantry cranes needed to be relocated to the raised beams. Nine large gantry cranes needed to be relocated, the heaviest of which was a 450t / 30t model weighing approximately 720 tons. Conventional methods would have required dismantling the gantry cranes in the old plant before relocating them to the new plant for installation. Due to the tight construction schedule and limited space, the relocation process was extremely challenging, requiring significant time and resources, making it difficult to complete on time and failing to meet production requirements. Currently, there is no established practice of using large gantry cranes to pull and climb sloped beams, creating a bottleneck in the upgrade of the slab casting line that urgently needs a breakthrough. Summary of the Invention

[0003] The purpose of the present invention is to provide a construction method for towing a large gantry crane to climb a slope on a slope beam, overcome the shortcomings of the existing technology, combine actual production experience, and creatively change the original construction process. By towing the large gantry crane from a low-elevation crane beam to a crane beam at a higher elevation through a winch traction system, the purpose of raising the lifting height of the gantry crane is achieved. The construction process is practical, safe and reliable.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A construction method for a large gantry crane to tow and climb a slope on a slope beam includes the following steps: manufacturing the slope beam, installing the slope beam, setting up a winch traction system, and gantry crane traction. The specific operation steps are as follows: 1) Manufacturing the slope beam: the slope beam is made of welded H-shaped steel, the slope beam angle is 1.5-1.8°, and its strength is verified to meet the wheel pressure requirements of a 720-ton heavy gantry. The slope beam is installed in two sections and lifted to the installation site by a car crane; 2) Installing the slope beam: the slope beam is hoisted to the connection position of the high and low crane beams, one end of the slope beam is welded and fixed to the original low-elevation crane beam 1, and angle steel is welded to the upper end of the slope beam rib plate to connect it to the steel column of the factory building, a track and a track pressure plate are welded on the slope beam, and the other end of the slope beam is welded and fixed to the higher-elevation crane beam 2; the flange welding of the slope beam and the crane beam 1 adopts 100 / 200mm intermittent welding; 3) Setting up the winch traction system: two 8t worm winches are set On the ground below the crane beam 2, two sets of 3×3 movable pulleys are connected to the steel columns of the factory building. One end of the wire rope is connected to the gantry crane for traction operation, and the other end of the wire rope is connected to the worm winch after being guided by the two sets of movable pulleys; 4) Gantry crane traction, calculate the traction force of the winch required for gantry crane traction, consider the safety system of the wire rope, and make the wire rope model meet the needs of out-of-control conditions. The wire rope must be taut before starting. Two 8-ton worm winches are pulled synchronously. When towing the gantry crane, seven operators are dispatched to operate, one of whom is the general commander. The general commander controls the remote control in column E, and two operators control the two worm winches separately according to the signal of the general commander. The two operators watch the wheel rim when the gantry crane climbs the slope, and the other two operators watch the tightness of the winch rope until the gantry crane is towed from the low-elevation crane beam 1 to the higher-elevation crane beam 2 through the winch traction system, completing the construction purpose.

[0006] Furthermore, the traction force of the winch is calculated to be 51.14 tons; the safety factor of the winch wire rope is not less than 5 times.

[0007] Furthermore, the gantry vehicle stops at a distance of 2.5-3 meters from the starting point of the slope beam before starting towing, and the welding points at the starting point and the end point of the track need to be smoothed.

[0008] Furthermore, each of the seven operators is equipped with a walkie-talkie set on the same channel.

[0009] Furthermore, when the commander-in-chief operates the remote control, he observes the climbing operation status of the crane together with the person watching the wheel rim.

[0010] Furthermore, when the two worm winches are working, the motor current and voltage need to be monitored in real time to keep them consistent.

[0011] Furthermore, when the gantry vehicle is climbing a slope, once the wheel edge deviates from the track, the winch is immediately notified via the intercom to stop, and a unilateral deviation correction operation is performed.

[0012] Furthermore, once the state of the hoisting rope is relaxed from the taut state, the hoisting machine is immediately stopped through the intercom, and a unilateral deviation correction operation is performed.

[0013] Furthermore, the two sets of movable pulleys are connected to the gantry vehicle buffer base via a snap ring to prevent the movable pulleys from scraping the gantry vehicle platform as the angle is raised.

[0014] Furthermore, in step 2), when the slope beam is installed, if the old crane beam has deflection, a steel plate can be added to the gap and firmly welded to the arched crane beam and the slope beam above.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) Based on actual production experience, the original construction process was creatively changed. The large gantry crane was pulled from the low-elevation crane beam to the higher-elevation crane beam through the hoisting traction system to increase the lifting height of the gantry crane. This provided strong support for the upgrading and transformation of the production line, with low costs and short construction period, bringing greater economic benefits to the enterprise.

[0017] 2) The entire construction process is feasible, safe and reliable, and can provide useful reference for similar construction sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a winch traction system according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the two-section blanking structure of the slope beam in an embodiment of the present invention;

[0020] In the figure: 1-slope beam, 2-truss car, 3-crane beam 1, 4-crane beam 2, 5-worm winch, 6-movable pulley, 7-factory steel column, 8-wire rope. DETAILED DESCRIPTION

[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying any creative work.

[0023] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.

[0024] See Figure 1 , is a schematic diagram of the structure of a hoisting and traction system according to an embodiment of the present invention. The present invention provides a construction method for a large gantry truck to tow and climb a slope beam, including slope beam production, slope beam installation, hoisting and traction system setup, and gantry truck towing. The specific operation steps are as follows:

[0025] 1) Slope beam production. Slope beam 1 is made of welded H-shaped steel H1700×800×50×50, which serves as a support to ensure overall stability. The beam length is 54 meters, and the slope beam 1 has an angle of 1.5-1.8°. Taking 1.8° as an example, its strength is verified to meet the wheel load requirements of 720-ton heavy truss truck 2. Slope beam 1 is installed in two sections and lifted to the installation site by a truck crane. Figure 2 ;

[0026] 2) For the installation of the slope beam 1, a large hydraulic crane is used to lift the slope beam 1 to the height difference position of the crane beam. One end of the slope beam 1 is welded and fixed to the crane beam 1, and an angle steel is welded to the upper end of the rib of the slope beam 1 to connect it to the steel column 7 of the factory building. A track and a track pressure plate are welded to the slope beam 1. The slope beam 1 is welded to the upper flange of the original crane beam using 100 / 200mm intermittent welding, with hf=12mm. The other end of the slope beam 2 is welded and fixed to the end of the crane beam 2 4 with a higher elevation. When the slope beam 1 is installed, if the crane beam 1 has deflection, there will be a gap of 10mm to 30mm when the slope beam 1 is installed on the upper flange of the middle part of the crane beam 1, and it cannot be tightly attached. At this time, a 10mm to 30mm steel plate with a size of -120*200mm and a spacing of 200mm can be used in the gap to weld it firmly to the arched crane beam 1 3 and the slope beam 1 above.

[0027] 3) Winch and traction system setup: Two 8t worm winches are installed on the ground below the crane beam platform. Two sets of 3×3 movable pulleys 6 are connected to the factory building steel columns 7. One end of the wire rope 8 is connected to the gantry vehicle 2 for traction operation. The other end of the wire rope 8 is guided by the two sets of movable pulleys 6 and connected to the worm winch 5. The worm winch is characterized by slow traction speed and high traction force.

[0028] 4) Towing of the crane 2: Calculate the required winch traction force for crane 2 towing. The heaviest crane 2 in the steel mill weighs 720 tons, and this crane 2 is used for the towing verification calculation. Based on the manufacturer's data for the crane 2, the total friction generated by the rolling friction of the crane 2 is calculated to be 51.14 tons, so the required traction force for towing the crane 2 is 51.14 tons. Considering the 5-fold safety factor of the wire rope, a 21.5mm diameter steel wire rope (6×37-FC: 1670 fiber core) is used to ensure that the wire rope meets the requirements for runaway conditions. The total breaking force of the 21.5mm diameter steel wire rope is 30.7 tons. With a 5-fold safety factor for the winch wire rope, the allowable tensile force per rope is 6.1 tons, which is greater than 5.114 tons and meets the requirements for runaway conditions.

[0029] The gantry crane 2 is electronically stopped 3 meters from the starting point of the ramp beam 1. The welds at the starting and ending points of the track are smoothed. The wire rope must be taut before starting, and two 8-ton worm winches 5 are pulled synchronously. The required winch force for towing the gantry crane 2 is 51.14 tons, and each winch needs to generate 25.57 tons of traction. Using a 3×3 pulley system, one 8-ton worm winch can generate 48 tons of traction, meeting the requirements. When towing the 450t / 30t gantry crane 2, the movable pulley 6 is connected to the buffer base with a retaining ring to prevent the movable pulley from scraping the loading and unloading platform as the angle is raised. The two sets of movable pulleys 6 are connected to the buffer base of the gantry crane 2 with retaining rings to prevent the movable pulley 6 from scraping the gantry crane platform as the angle is raised.

[0030] When towing crane 2, seven operators are deployed, each equipped with a walkie-talkie set to the same channel. One operator serves as the overall commander, operating the remote control from column E and monitoring the crane's climbing progress alongside the wheel flange personnel. Two operators independently control the two worm winches based on the overall commander's signals. The motor current and voltage of the two worm winches must be monitored in real time to ensure consistency. The two operators monitor the wheel flanges as crane 2 climbs. If the wheel flanges deviate from the track, they immediately stop the winches via the intercom and perform unilateral corrections. The two operators also monitor the winch ropes. If the ropes become loosened from tautness, they immediately stop the winches via the intercom and perform unilateral corrections. This completes the construction process until crane 2 is towed from the lower-elevation crane beam 1 (3) via the winch traction system to the higher-elevation crane beam 2 (4).

[0031] Single-side deviation correction operations include, but are not limited to, stopping the tight side winch, starting the loose side winch, increasing the loose side winch speed, and maintaining the tight side winch speed. After the work is completed, crane beam 1 (3) must be raised to the same height as crane beam 2 (4) to expand the gantry crane's range of motion. This is not relevant to this application.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for a large gantry truck towing and climbing a slope beam, characterized in that: It includes slope beam production, slope beam installation, winch traction system setting and gantry traction. The specific operation steps are as follows: 1) Fabrication of the slope beam: The slope beam is made of welded H-shaped steel with an angle of 1.5-1.8°. Its strength is calculated to meet the wheel load requirements of a 720-ton heavy truss. The slope beam is installed in two sections and lifted to the installation site by a truck crane. 2) Installation of the slope beam: hoist the slope beam to the connection position of the high and low crane beams. Weld one end of the slope beam to the original low-elevation crane beam 1 and fix it. Weld angle steel to the upper end of the slope beam rib plate and connect it to the factory steel column. Weld the track and track pressure plate to the slope beam. Weld the other end of the slope beam to the higher-elevation crane beam 2 and fix it. Use 100 / 200mm intermittent welding to weld the flanges of the slope beam and crane beam 1. 3) Winch and traction system setup: Two 8t worm winches are installed on the ground below the second crane beam. Two sets of 3×3 movable pulleys are connected to the steel columns of the powerhouse. One end of the wire rope is connected to the gantry truck for traction operation, and the other end of the wire rope is guided by two sets of movable pulleys and connected to the worm winch. 4) For gantry crane traction, calculate the traction force of the winch required for gantry crane traction, consider the safety system of the wire rope, and make sure the model of the wire rope meets the needs of out-of-control conditions. The wire rope must be tightened before starting, and two 8-ton worm winches are pulled synchronously. When towing the gantry crane, seven operators are dispatched to operate it, one of whom is the general commander, who controls the remote control in column E, and two operators control the two worm winches separately according to the signal of the general commander. Two operators watch the wheel rim when the gantry crane climbs the slope, and two operators watch the tightness of the winch rope until the gantry crane is towed from the low-elevation crane beam 1 to the higher-elevation crane beam 2 through the winch traction system, completing the construction purpose.

2. A construction method for climbing a slope by pulling a large gantry truck on a slope beam according to claim 1, characterized in that: The traction force of the winch is calculated to be 51.14 tons; the safety factor of the winch wire rope is not less than 5 times.

3. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: The gantry truck stops at 2.5-3 meters away from the starting point of the slope beam before starting towing, and the welding points of the starting point and the end point of the track need to be smoothed.

4. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: Each of the seven operators is equipped with a walkie-talkie set on the same channel.

5. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: When the commander-in-chief operates the remote control, he and the wheel edge observer observe the climbing operation status of the crane.

6. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: When the two worm winches are working, the motor current and voltage must be monitored in real time to keep them consistent.

7. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: When the gantry crane is climbing a slope, once the wheel edge deviates from the track, the winch is immediately notified via an intercom to stop and a unilateral deviation correction operation is performed.

8. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: Once the state of the hoisting rope is relaxed from the taut state, the hoist is immediately stopped through the intercom, and a unilateral deviation correction operation is performed.

9. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: The two sets of movable pulleys are connected to the gantry vehicle buffer base via a clamping ring to prevent the movable pulleys from scraping the gantry vehicle platform as the angle is lifted.

10. The construction method of using a large gantry truck to pull and climb a slope beam according to claim 1, characterized in that: Step 2) When installing the slope beam, if the old crane beam has deflection, steel plates can be added in the gaps and welded firmly to the arched crane beam and the slope beam above.

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