A shore crane girder in-air lengthening device and method

Abstract

Provided are a quay crane girder air lengthening device and method. The device comprises a base, a track and a sliding support assembly. The base is located below the quay crane girder and comprises a positioning connector and a construction platform. The positioning connector is used to connect the base and the quay crane girder. A part of the construction platform is located below the front section of the girder. The track is arranged at the bottom of the front section of the girder and extends along the length direction of the quay crane girder. The sliding support assembly comprises a plurality of sliding support devices. Each sliding support device comprises a support and a track matching part. The support is arranged on the construction platform. The track matching part is arranged at the top of the support and is used to match the track to move the front section of the girder. The height of the track matching part relative to the construction platform is adjustable. The device can make the sliding stroke of the front section of the girder not be limited by the size of the base, and can be flexibly adapted to the lengthening construction of the quay crane under the conditions of single box or two or more boxes.

Description

Technical Field

[0001] This invention relates to the field of quay crane extension technology, specifically to an aerial sliding adjustment support device and a sliding adjustment method. Background Technology

[0002] Quay cranes (also known as quay container cranes) are large lifting equipment used at the front of a wharf to load and unload containers between ships and the wharf. With the increasing size of container ships, it is necessary to lengthen and modify the main beams of quay cranes.

[0003] Extending and modifying the main girder of a quay crane requires dividing the main girder into two sections and separating them. The missing sections are then filled with extended sections and reconnected to form a whole. Traditional quay crane girder extension construction usually requires disassembling the entire quay crane girder from the quay crane, hoisting it to the ground, and then cutting and extending it. This places high demands on lifting equipment and site conditions.

[0004] In the prior art, Chinese patent CN110407087A discloses an extension device and method for the main beam of a quay container crane. Before the extension operation, the extension trolley is installed under the rear section and the front section of the main beam. The first bracket trolley carries the extended section of the main beam on the moving track, and the second bracket trolley is installed on the moving track. During the extension operation, it carries the front section of the main beam and moves in a second direction perpendicular to the first direction in a first plane. After installation, the main beam can be extended without the need to install auxiliary equipment. The quay crane does not need to be moved. The extension operation can be carried out on the original operating track, reducing the use of large equipment.

[0005] However, quay cranes have different operating conditions depending on the number of container bays to be lifted (e.g., single bay, two bays, etc.). When the main beam of a quay crane operating with two or more bays is extended, the front section of the main beam after being cut is heavier and the required extension length, i.e., the distance the front section of the main beam needs to be moved forward, is also longer compared to the single bay operating condition.

[0006] The inventors discovered that the load-bearing capacity of the bracket trolley used in the existing technical solution is limited. At the same time, the front section of the main beam is relatively fixed to the bracket trolley. Due to the limited movement distance of the bracket trolley, the extension distance of the front section of the main beam is short. It is only suitable for single-box work conditions and cannot meet the requirements of the heavy-weight cut-off section in terms of support stiffness and extension distance when the quay crane is extended for two-box or more work conditions. Summary of the Invention

[0007] One object of the present invention is to provide an aerial extension device for the main girder of a quay crane, which better meets the requirements of the cut-off section in terms of support stiffness and extension distance.

[0008] An extension device for achieving the above objectives includes a base located below the quay crane girder, a positioning connector, and a construction platform. The positioning connector connects the base and the quay crane girder, and a portion of the construction platform is located below the front section of the girder. The extension device further includes a track and a sliding support assembly. The track is disposed at the bottom of the front section of the girder and extends along the length of the quay crane girder. The sliding support assembly includes multiple sliding support devices, each of which includes a support member and a track mating member. The support member is disposed on the construction platform, and the track mating member is disposed on top of the support member for engaging with the track to move the front section of the girder. The height of the track mating member relative to the construction platform is adjustable.

[0009] In one or more embodiments, at least one of the track and the track fitting is provided with a limiting member for limiting the movement of the other in a lateral direction, the lateral direction being perpendicular to the length direction.

[0010] In one or more embodiments, the track fitting includes a roller that rolls with the track, the limiting member includes a groove on the surface of the roller, or the track includes a track groove in which the roller is movably disposed.

[0011] In one or more embodiments, the support further includes a first support and a second support, and a height adjustment member located between the two, wherein the first support is connected to the construction platform, the second support is connected to the track fitting, and the height adjustment member is threadedly connected to the first support and / or the second support.

[0012] In one or more embodiments, the height adjustment component includes a double-ended screw with opposite threads at both ends, which are threadedly connected to the first support and the second support, respectively.

[0013] In one or more embodiments, the first support and / or the second support includes at least one set of reinforcing ribs.

[0014] In one or more embodiments, a stop device is provided at the end of the track.

[0015] In one or more embodiments, the quay crane girder includes a pair of parallel beams, each of which has at least one track at its bottom.

[0016] Another object of the present invention is to provide a method for aerial extension of a quay crane girder, comprising the following steps: placing the extended girder section on the base, and lifting the base carrying the extended girder section to below the quay crane girder; connecting the base and the quay crane girder using the positioning connector, such that a portion of the construction platform is located below the front section of the girder; placing the track along the length direction on the bottom surface of the front section of the girder; placing the sliding support assembly on the construction platform at the position corresponding to the track, such that the track fitting is aligned with the track along the length direction; adjusting the height of the track fitting relative to the construction platform, such that the track fitting fits the track; dividing the front section and the rear section of the girder, and supporting the divided front section of the girder with the sliding support assembly; moving the front section of the girder along the length direction to a target position; moving the extended girder section into the gap between the front section and the rear section of the girder, and connecting the two ends of the extended girder section to the front section and the rear section of the girder respectively.

[0017] In one or more embodiments, at least one of the track and the track fitting is provided with a limiting member for limiting the movement of the other in the lateral direction, the lateral direction being perpendicular to the length direction. During the movement of the front section of the main beam along the length direction, the limiting member restricts the movement of the front section of the main beam in the lateral direction.

[0018] In one or more embodiments, the extended section of the main beam is first aligned with the front section and the rear section of the main beam, and then the extended section of the main beam is placed above the sliding support assembly. The height of the track fitting relative to the construction platform is adjusted to adjust the height of the front section and the extended section of the main beam relative to the construction platform.

[0019] The aforementioned aerial extension device for the quay crane girder, through the installation of tracks and sliding support components, allows the front section of the cut girder to move relative to the sliding support components, achieving a longer extension on a base of the same size. This flexibly adapts to the construction of quay cranes with single or double or more box berths. At the same time, by distributing the sliding support device at multiple points, the stress concentration of the front section of the cut girder is reduced, allowing the extension device to support the front section of the girder with greater weight and preventing damage such as squeezing during movement. Attached Figure Description

[0020] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a front view of one embodiment of the device of the present invention; Figure 2 This is a side view of one embodiment of the device of the present invention; Figure 3 This is a schematic diagram of the structure of one embodiment of the support device in the device of the present invention; Figure 4 These are front and side views of one embodiment of the support device in the apparatus of the present invention; Figure 5 This is a schematic diagram of the device of the present invention performing a single-box work condition beam lengthening modification operation; Figure 6 This is a schematic diagram of the device of the present invention performing beam lengthening and modification operations under working conditions with two or more box positions.

[0021] Explanation of reference numerals in the attached figures: 1. Front section of the main beam; 11. Track; 12. Stopping device; 12'. Stop block; 13. Drive unit; 14. Safety device; 2. Rear section of the main beam; 3. Extended section of the main beam; 4. Base; 41. Positioning connector; 42. Construction platform; 5. Sliding support device; 51. Supporting components; 511. The first support; 512. Second support; 513. Reinforcing ribs; 52. Rail fittings; 52'. Roller; 521. Limiting components; 521'. Groove; 522. End cap; 523. Spacer; 524. Shaft seat; 525. Shaft stop plate; 53. Height adjustment mechanism; 53'. Double-ended screw; 531. Through hole; A. Main beam of the quay crane; B. Sliding support assembly; C. Parallel beams; J. Cutting surface; X. Length direction; Y. Lateral direction. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0023] Furthermore, the length direction mentioned below is represented by the X direction, which refers to the sea-to-land direction of the quay crane, where +X indicates the sea-side direction and -X indicates the land-side direction. The lateral direction is represented by the Y direction, which is perpendicular to the sea-to-land direction; the height direction of the quay crane is represented by the Z direction.

[0024] Figures 1 to 2 The specific structure of the aerial extension device for the quay crane beam described in this invention is shown. The extension device is installed on the quay crane beam A and includes a base 4, a track 11, and a sliding support assembly B.

[0025] The main girder A of the quay crane can be divided into a front section 1 and a rear section 2 according to the cutting surface J. During the lengthening operation of the quay crane girder, the front section 1 and the rear section 2 are separated through the cutting surface J. After the front section 1 is moved away from the rear section 2 along the length direction X of the quay crane girder A, it is filled with... Figure 5 The extended section 3 shown represents the extension of the main girder of the quay bridge.

[0026] Reference Figure 1 As understood, the base 4 is located below the main girder A of the quay crane and includes a positioning connector 41 and a construction platform 42. The positioning connector 41 can adopt detachable connection methods, including but not limited to bolt connection, pin connection, and snap-fit ​​connection, so that the base 4 and the main girder A of the quay crane form a rigid connection and form a cantilever support structure.

[0027] A portion of the construction platform 42 is located below the front section 1 of the main beam, providing operating space for the installation of the sliding support assembly B and the sliding operation after the front section 1 of the main beam is divided. The specific structure of the sliding support assembly B will be described in detail below.

[0028] Reference Figure 1 It is understood that a track 11 is provided at the bottom of the front section 1 of the main beam, the track 11 is rigidly connected to the front section 1 of the main beam, and extends along the length direction X towards both ends of the front section 1 of the main beam. The sliding support assembly B is set on the construction platform 42 and consists of multiple sliding support devices 5.

[0029] Each sliding support device 5 is equipped with a support member 51 and a track fitting member 52. The top of the support member 51 is connected to the track fitting member 52, and the bottom is connected to the construction platform 42. The track fitting member 52 and the track 11 cooperate with each other, so that the front section 1 of the beam can move along the length direction X on the track fitting member 52 via the track 11 after cutting.

[0030] Preferably, the track 11 is fixed to the bottom of the front section 1 of the beam by welding to enhance the rigid connection strength between the track 11 and the front section 1 of the beam. Before welding, the bottom surface of the front section 1 of the beam is ground to make the track 11 straighter, so as to ensure that the track 11 and the track mating part 52 fit well.

[0031] like Figure 2 The side view of the quay crane beam shown shows that the quay crane beam A includes at least one pair of parallel beams C. At least one track 11 is provided at the bottom of the front section 1 of each parallel beam C. Correspondingly, the construction platform 42 is provided with a sliding support assembly B that matches the number of tracks 11, so that the front section 1 of the beam is subjected to more uniform force.

[0032] In one specific embodiment of the track fitting 52, the track fitting 52 includes a roller 52', which rolls with the track 11 when the front section 1 of the main beam slides along the length direction X. Of course, the track fitting 52 can also be other structures, such as a slider, so that the slider slides with the track 11 when the front section 1 of the main beam slides along the length direction X.

[0033] At least one of the track 11 and the track mating part 52 is provided with a limiting member 521 for limiting the movement of the other in the lateral direction Y, which is perpendicular to the length direction X.

[0034] For example, when the track fitting 52 is a roller 52', one embodiment is a groove 521' on the surface of the roller 52'. The groove 521' forms raised rims on both sides of the roller 52', which fit with both sides of the track 11, so that when the roller 52' ​​and the track 11 are in rolling contact, the two sides of the groove 521' can restrict the movement of the track 11 in the lateral direction Y. Thus, the two sides of the roller 52' ​​form limiting members 521, and the track 11 and the track fitting 52 are mutually limited by the limiting members 521, preventing the track 11 from shifting to both sides of the track fitting 52 during movement, that is, in the lateral direction Y perpendicular to the length direction X, so as to prevent the front section 1 of the beam from shifting in the lateral direction Y during movement along the length direction X.

[0035] For example, the limiting member 521 can also be provided on the track 11. A track groove (not shown in the figure) is provided on the bottom surface of the track 11 along the length direction X. This allows the roller 52' ​​to be movably positioned in the track groove when it rolls with the track 11, with the two side walls of the track groove forming a lateral constraint on the roller 52', thereby limiting the movement of the roller 52' ​​in the lateral direction Y.

[0036] Continue to refer to Figure 4 As shown, the track fitting 52 also includes structures such as an end cap 522, a bearing seat 524, and a retaining plate 525. The roller 52' ​​rotates on the track fitting 52 via the bearing seat 524 to reduce wear generated during the rolling of the roller 52'. The end of the bearing seat 524 is provided with a retaining plate 525, and the outer side of the bearing seat 524 is provided with an end cap 522 with a skeleton oil seal. The end cap 522 and the retaining plate 525 together restrict the axial displacement of the roller 52' ​​on the bearing seat 524 during rolling and prevent dust and rainwater from entering, thereby extending the service life of the roller 52'.

[0037] The track fitting 52 also includes a spacer 523, which is made of wear-resistant materials including but not limited to polyurethane. It is placed between the wheel bearings to adjust the axial clearance of the wheel, so that the roller 52' ​​can rotate flexibly under heavy load without axial movement.

[0038] In addition, the height of the track fitting 52 relative to the construction platform 42 is set to be adjustable, so that the sliding support device 5 can at least actively lift the front section 1 of the beam and adjust its levelness.

[0039] In some embodiments, the support 51 includes a first support 511, a second support 512, and a height adjustment member 53 located between the two.

[0040] Reference Figures 2 to 4 It is understood that the first support 511 is detachably connected to the construction platform 42 using methods including but not limited to bolt connections and snap-fit ​​connections, serving as the installation base for the entire sliding support device 5. One end of the second support 512 is connected to the track fitting 52, and the other end is connected to the first support 511 via the height adjustment component 53, so that the load of the front section 1 of the main beam is transferred to the base 4 sequentially through the track fitting 52, the second support 512, the height adjustment component 53, and the first support 511.

[0041] In some embodiments, such as Figure 4As shown, the height adjustment component 53 is rotatably connected to the first support 511 and the second support 512. At least one end of the height adjustment component 53 is threaded, allowing it to be threadedly connected to at least one of the first support 511 and the second support 512. Rotating the height adjustment component 53 causes the threaded end of the component to be screwed in or out along the thread, thereby precisely adjusting the relative distance between the first support 511 and the second support 512, and consequently adjusting the height of the track fitting component 52 relative to the construction platform 42.

[0042] For example, the height adjustment component 53 includes a double-ended screw 53', the two ends of which are threadedly connected to the first support 511 and the second support 512, respectively. The threads at the two ends of the double-ended screw 53' turn in opposite directions, so that when the height adjustment component 53 rotates, the two ends of the double-ended screw 53' connected to the first support 511 and the second support 512 simultaneously screw in or out relative to each other. This reduces the number of rotations required for the height adjustment component 53 while precisely adjusting the relative distance between the first support 511 and the second support 512.

[0043] Preferably, the height adjustment member 53 has a through hole 531 in the middle. When one end of a pry bar (not shown in the figure) is inserted into the through hole 531, the other end of the pry bar can be turned to drive the rotation of the height adjustment member 53.

[0044] Preferably, at least one of the first support 511 and the second support 512 further includes a reinforcing rib 513 to enhance the structural strength of the sliding support device 5 and prevent it from deforming during the movement of the front section 1 of the main beam.

[0045] A stop device 12 is also provided at the end of the track 11 to limit the range of movement of the front section 1 of the main beam relative to the construction platform 42. (Return to...) Figure 1 As shown, the track 11 is provided with stop devices 12 at both ends along the length direction X. After the front section 1 of the beam slides to the target position, the stop devices 12 can restrict the further movement of the track 11 relative to the track mating part 52.

[0046] In one specific embodiment of the stop device 12, the stop device 12 includes stop blocks 12' disposed at both ends of the track 11. After the front section 1 of the main beam slides to the target position, the stop blocks 12' are fixed at both ends of the track 11, such that at least one of the stop blocks 12' abuts against the track fitting 52 of at least one sliding support device 5, thereby restricting the relative movement of the track fitting 52 and the track 11.

[0047] The aforementioned extension device involves setting up a sliding support assembly consisting of multiple sliding support devices on the construction platform of the base, and setting up a track extending along the length direction at the bottom of the front section of the main beam. This allows the cut front section of the main beam to slide along the length direction through the cooperation of the track and track fittings. As a result, the sliding stroke of the front section of the main beam is no longer limited by the size of the base, and it can move flexibly within the entire length of the track. This allows for a longer extension distance on the same size base, flexibly adapting to the extension construction of quay cranes with single or two or more box berths.

[0048] Compared to existing jack and sleeper combinations, this structure has the advantage that the cut-off front section 1 of the main beam can be moved further forward relative to the base 4, such as... Figure 6 As shown, supported by the aforementioned track 11 and multiple sliding support devices 5, part of the front section 1 of the main beam can be suspended in the air, whereas in traditional structures, the front end of the front section 1 of the main beam can only be flush with the front end of the base 4. In this way, the front section 1 of the main beam can have a longer front extension distance.

[0049] Meanwhile, the multi-point distributed sliding support device evenly bears the weight of the front section of the main beam, reducing the stress concentration of the front section of the main beam after segmentation. This allows the extended device to support the front section of the main beam with a greater weight and avoids damage such as squeezing of the front section of the main beam during movement.

[0050] Furthermore, the aforementioned extension device, through the installation of a height adjustment component that connects threadedly to the support, allows for active adjustment of the height of the track assembly relative to the construction platform. This enables active jacking of the front section of the main beam and precise leveling. Compared to the existing technology that uses jacks and shims for adjustment, the height adjustment component eliminates the need for repeated processes of removing shims, depressurizing, and re-inserting. Once adjusted to the correct position, it remains locked via a self-locking thread, requiring no additional shims or mechanical locking measures.

[0051] Based on the description of the above-mentioned aerial extension device for quay crane girders, a method for aerial extension of quay crane girders can also be understood. This method includes the following steps.

[0052] Place the extended section 3 of the main beam on the base 4, and lift the base 4, which carries the extended section 3, to below the main beam A of the quay crane. Use the positioning connector 41 to connect the base 4 and the main beam A of the quay crane, so that part of the construction platform 42 is located below the front section 1 of the main beam; place the track 11 along the length direction X on the bottom surface of the front section 1 of the main beam; place the sliding support component B on the construction platform 42 at the position corresponding to the track 11, so that the track mating component 52 is aligned with the track 11 along the length direction X; adjust the height of the track mating component 52 relative to the construction platform 42 so that the track mating component 52 mates with the track 11; divide the front section 1 and the rear section 2 of the main beam, and use the sliding support component B to support the divided front section 1 of the main beam; move the front section 1 of the main beam along the length direction X to the target position; move the extended section 3 of the main beam into the interval between the front section 1 and the rear section 2 of the main beam, and connect the two ends of the extended section 3 of the main beam to the front section 1 and the rear section 2 of the main beam, respectively.

[0053] The following describes a specific operation process of this method.

[0054] The extended section 3 of the main girder is placed on the base 4, and the base 4, which carries the extended section 3, is lifted as a whole to the position below the main girder A of the quay crane. In other words, the extended section 3 of the main girder is pre-placed on the base 4, and then the base 4, which carries the extended section 3, is lifted as a whole to the designed position below the main girder A of the quay crane using hoisting equipment.

[0055] The main girder A is marked with a cutting surface J at a predetermined position to divide the main girder into a front section 1 and a rear section 2. Tracks 11 extending along the length direction X towards both ends of the front section 1 are welded to the bottom surface of the front section 1. Before welding, the bottom surface of the front section 1 is ground to ensure a good fit between the track 11 and the bottom surface, guaranteeing smooth rolling when the track fitting 52 of the subsequent sliding support device 5 engages with the track 11.

[0056] The base 4 and the quay crane girder A are connected using positioning connector 41, making the base 4 rigidly connected to the quay crane girder A and forming a cantilever support structure. At the same time, the position of the base 4 is adjusted so that part of the construction platform 42 is located below the front section 1 of the girder. For example, the base 4 is connected to the pre-welded support on the quay crane girder A by high-strength bolts, so that part of the base 4 is located below the rear section 2 of the girder, and another part is located directly below the cut-off area of ​​the front section 1 of the girder, providing operating space and a load-bearing foundation for the subsequent installation and operation of the sliding support assembly B.

[0057] Multiple sliding support devices 5 of the sliding support assembly B are placed on the construction platform 42 at positions corresponding to the track 11. Each sliding support device 5 is detachably fixed to the construction platform 42 by bolts through the first support 511 of the support member 51, so that the track mating member 52 is aligned with the track 11 along the length direction X. At this time, a certain gap is maintained between the top of the track mating member 52 and the track 11, and they have not yet made contact.

[0058] Subsequently, a pry bar is inserted into the through hole 531 in the middle of the height adjustment component 53, and the pry bar is moved to drive the height adjustment component 53 to rotate, so that the threaded connection depth between the height adjustment component 53 and the first support 511 and the second support 512 gradually changes, thereby precisely lifting the second support 512 and the track mating component 52, so that the roller 52' ​​of the track mating component 52 is fully engaged with the track 11. The height adjustment components 53 of each sliding support device 5 are adjusted independently to ensure that each sliding support device 5 is subjected to uniform force, and the levelness error of the front section 1 of the main beam is controlled within the range that meets the requirements of the main beam docking accuracy.

[0059] Subsequently, the main girder A of the quay bridge is cut along the cutting surface J, separating the front section 1 and the rear section 2 of the main girder. After the separation, the entire weight of the front section 1 is borne by the sliding support assembly B. Through the rolling engagement of the track 11 and the track mating parts 52, the front section 1 of the main girder slides along the length direction X on the sliding support device 5. During the sliding of the front section 1 of the main girder along the length direction X, the raised rims on both sides of the groove 521' on the wheel surface of the roller 52' ​​engage with both sides of the track 11. The relative movement of the roller 52' ​​and the track 11 in the lateral direction Y forms a constraint, thereby preventing the front section 1 of the main girder from deviating in the lateral direction Y during sliding.

[0060] Subsequently, the drive device 13 is used to move the front section 1 of the main beam along the length direction X to the target position. The drive device 13 can employ devices including, but not limited to, hydraulic push rods and traction cables, to smoothly slide the front section 1 of the main beam along the track 11. During the sliding process, safety devices 14, including but not limited to hand-operated hoists and damping devices, limit the sliding speed to ensure safety.

[0061] Subsequently, after the front section 1 of the main beam slides to the target position, the stop block 12' is welded and fixed to the target point of the track 11, so that the stop block 12' abuts against at least one track fitting 52 of the sliding support device 5, thereby restricting the relative movement of the track fitting 52 and the track 11 and preventing the front section 1 of the main beam from moving forward further. Only one stop block 12' can be welded, for example, the stop block 12' can be welded to the rear end of the track 11 to prevent the front section 1 of the main beam from moving further forward; or two stop blocks 12' can be welded at two positions on the track 11 to prevent the front section 1 of the main beam from moving in the +X and -X directions.

[0062] Subsequently, the extended section 3 of the main beam on the base 4 is moved into the gap between the front section 1 and the rear section 2 of the main beam. For example, the construction platform 42 is equipped with a track along the lateral direction Y (not shown in the figure), and the extended section 3 of the main beam is initially located in the lateral direction of the main beam. After the front section 1 of the main beam moves forward to the target position and defines the installation space of the extended section with the rear section 2 of the main beam, the extended section 3 of the main beam is moved inward along the lateral direction, so that the front section 1, the extended section 3, and the rear section 2 of the main beam are basically collinear.

[0063] Subsequently, the extended section 3 of the main beam is placed on the sliding support assembly B, with the bottom surface of the extended section 3 in direct contact with the track mating component 52. Using the rear section 2 of the main beam as a reference, the height of the front section 1 and the extended section 3 of the main beam relative to the construction platform 42 is finely adjusted by adjusting the height adjustment component 53. First, the extended section 3 of the main beam is connected to the rear section 2 of the main beam, and then connected to the front section 1 of the main beam. The splicing positions of the front section 1, the rear section 2, and the extended section 3 of the main beam are fixed by means of clamps, etc., to control the flatness of the port connection.

[0064] Finally, after confirming that the dimensions are correct, the two ends of the extended section 3 of the main beam are welded and fixed to the front section 1 and the rear section 2 of the main beam, respectively. After welding, the bolt connection between the first support 511 and the construction platform 42, as well as the connection between the positioning connector 41 and the main beam A of the quay bridge, are removed. The sliding support device 5 and the base 4 are then moved out of the work area in sequence to complete the construction.

[0065] In the operation of extending the quay crane under single-container-position working conditions, refer to Figure 5 Understandably, the cut section of the front segment 1 of the main beam is relatively light, and the forward movement distance of the front segment 1 along the length direction X is relatively short, so the sliding and alignment can be completed within the length range of the construction platform 42.

[0066] In the extension operation of quay cranes with two or more container bays, refer to Figure 6 It is understood that the cut section of the front section 1 of the main beam is heavier, and the forward movement distance of the front section 1 of the main beam along the length direction X is longer. The above method only needs to lengthen the track 11, so that the front section 1 of the main beam can continue to move forward along the length direction X after reaching the edge of the construction platform 42 and be partially suspended. Thus, the travel requirements for the extension and modification of the quay crane with two or more box berths are met without changing the length of the construction platform 42.

[0067] It should be noted that the use of terms such as "first" and "second" to define components in the above content is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention. The above and subsequent drawings are merely examples and are not drawn to scale, and therefore should not be used as a limitation on the actual scope of protection of this invention.

[0068] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. An aerial extension device for a quay crane girder, installed on a quay crane girder, the quay crane girder comprising a front section and a rear section, the extension device comprising: The base, located below the main girder of the quay crane, includes a positioning connector and a construction platform. The positioning connector is used to connect the base and the main girder of the quay crane, and a portion of the construction platform is located below the front section of the main girder. The feature is that the lengthening device further includes: The track is located at the bottom of the front section of the main beam and extends along the length of the main beam of the quay crane; A sliding support assembly includes multiple sliding support devices, each of which includes a support member and a track mating member. The support member is disposed on the construction platform, and the track mating member is disposed on the top of the support member for mating with the track to move the front section of the main beam. The height of the track assembly relative to the construction platform is adjustable.

2. The aerial extension device for the main girder of the quay crane as described in claim 1, characterized in that, At least one of the track and the track fitting is provided with a limiting member to limit the movement of the other in the lateral direction, the lateral direction being perpendicular to the length direction.

3. The aerial extension device for the quay crane girder as described in claim 2, characterized in that, The track fitting component includes a roller that rolls with the track, and the limiting component includes a groove on the surface of the roller, or The track includes a track groove, and the roller is movably disposed within the track groove.

4. The aerial extension device for the main girder of the quay crane as described in claim 1, characterized in that, The support also includes a first support and a second support, and a height adjustment component located between them. The first support is connected to the construction platform, the second support is connected to the track fitting component, and the height adjustment component is threadedly connected to the first support and / or the second support.

5. The aerial extension device for the main girder of the quay crane as described in claim 4, characterized in that, The height adjustment component includes a double-ended screw with opposite threads at both ends, which are threaded to the first support and the second support, respectively.

6. The aerial extension device for the main girder of the quay crane as described in claim 4, characterized in that, The first support and / or the second support includes at least one set of reinforcing ribs.

7. The aerial extension device for the main girder of the quay crane as described in claim 1, characterized in that, The track end is equipped with a stop device.

8. The aerial extension device for the main girder of the quay crane as described in claim 1, characterized in that, The main girder of the quay crane includes a pair of parallel beams, and at least one track is provided at the bottom of each parallel beam.

9. A method for aerial extension of a quay crane girder, using the aerial extension device for a quay crane girder as described in any one of claims 1-8, characterized in that, The method includes the following steps: The extended section of the main beam is placed on the base, and the base supporting the extended section of the main beam is lifted to the bottom of the main beam of the quay bridge; The positioning connector is used to connect the base and the quay crane beam, such that a portion of the construction platform is located below the front section of the beam; The track is positioned along the length direction on the bottom surface of the front section of the beam; The sliding support assembly is placed on the construction platform at the position corresponding to the track, so that the track mating component is aligned with the track along the length direction; Adjust the height of the track fitting relative to the construction platform so that the track fitting mates with the track; The main beam is divided into a front section and a rear section, and the front section of the main beam is supported by the sliding support assembly. Move the front section of the main beam to the target position along the length direction; The extended section of the main beam is moved into the gap between the front section and the rear section of the main beam, so that the two ends of the extended section of the main beam are respectively connected to the front section and the rear section of the main beam.

10. The method for aerial extension of the main girder of a quay crane as described in claim 9, characterized in that, At least one of the track and the track fitting is provided with a limiting member to limit the movement of the other in the lateral direction, wherein the lateral direction is perpendicular to the length direction. During the movement of the front section of the main beam along the length direction, the movement of the front section of the main beam in the lateral direction is restricted by the limiting member.

11. The method for aerial extension of the main girder of a quay crane as described in claim 9, characterized in that, First, align the extended section of the main beam with the front and rear sections of the main beam. Then, place the extended section of the main beam above the sliding support assembly and adjust the height of the track fitting relative to the construction platform to adjust the height of the front section and the extended section of the main beam relative to the construction platform.

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