A carrying device for an external catwalk capable of sliding on a single main cable

Abstract

The present invention discloses a bearing device for an outer catwalk that can slide on a single main cable, comprising: a main cable clamping seat, which is provided with a plurality of main cable clamping seats, and the top surface supports of the plurality of main cable clamping seats are provided with a continuous track; an upper frame, which is buckled on the main cable through an opening and is arranged to move along the track, and the legs of the upper frame are all internally hollow telescopic jackets; a vertical oil cylinder, whose telescopic rod extends downward into the telescopic jacket; a guide sleeve, which includes a vertical connecting rod and a horizontal telescopic rod, and the connecting rod extends vertically upward into the telescopic jacket and is connected to the telescopic rod of the vertical oil cylinder. On the one hand, the present invention solves the problem of carrying heavy objects in the air, and on the other hand, it can quickly disassemble and carry objects at the bottom of the catwalk, greatly reducing the installation, dismantling and carrying work of heavy objects placed under the catwalk, reducing the input of on-site labor, having little impact on the environment, improving construction efficiency, and having good economic benefits.

Description

Technical Field

[0001] The present invention relates to the field of suspension bridge lifting and handling equipment, and more specifically, to a load-bearing device with an outer catwalk that can slide on a single main cable. Background Art

[0002] The only handling device on the upper part of the main cable of a traditional suspension bridge is a ceiling trolley. Due to the limited carrying capacity of the ceiling trolley, the current lifting capacity is only about 10t. For heavy lifting objects, the conventional method is to swing or transfer them to the ground or water for handling, which has high risks and low efficiency. In this context, it is necessary to invent a carrying device with an external catwalk that can slide on a single main cable. On the one hand, it can slide along the main cable, and on the other hand, it can carry a large weight. At the same time, the carrying device is externally wrapped on the outside of the main cable to realize the handling of heavier objects under the catwalk.

[0003] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: the lifting capacity of the ceiling trolley is relatively small, and when encountering a larger object, it can only be disassembled or transported under the bridge for transportation. It is very dangerous to disassemble the object at high altitude, and if it is transported under the bridge, it is time-consuming and costly. When transporting objects under the catwalk, additional components need to be remade to assist in lifting, and it is difficult to control the center of gravity of the object during lifting. Summary of the invention

[0004] One object of the present invention is to provide a bearing device for an outer catwalk that can slide on a single main cable. On the one hand, it solves the problem of transporting heavy objects at high altitudes, and on the other hand, it can quickly dismantle and transport objects under the catwalk, greatly reducing the installation, dismantling and transportation work of heavy objects under the catwalk, reducing on-site labor input, having little impact on the environment, improving construction efficiency, and having good economic benefits.

[0005] In order to achieve these purposes and other advantages of the present invention, there is provided a carrying device for an outer catwalk that can slide on a single main cable, comprising:

[0006] A main cable clamping seat, which is arranged in plurality at intervals along the length direction of the main cable, the main cable clamping seat clamps the main cable and is connected to the catwalk below the main cable, and the top surfaces of the plurality of main cable clamping seats support a continuous track extending along the length direction of the main cable;

[0007] The upper frame is a square frame structure with an opening downward. The upper frame is buckled on the main cable through its opening and is arranged to move along the track. After being buckled, the upper frame symmetrically embraces the outer side of the catwalk. The legs of the upper frame are all telescopic jackets with hollow interiors.

[0008] A vertical oil cylinder, one of which is provided at each top end of the upper frame, the cylinder body of the vertical oil cylinder being fixed to the upper frame, and the telescopic rod extending downward into the telescopic sleeve;

[0009] A plurality of guide sleeves are provided and correspond one to one with the vertical cylinders. The guide sleeves include a vertical connecting rod and a horizontal telescopic rod connected to form an overall L-shape. The connecting rod extends vertically upward into the telescopic sleeve and is connected to the telescopic rod of the vertical cylinder. The telescopic rod is horizontally arranged toward the catwalk side.

[0010] Preferably, the telescopic rod is a two-section sleeve structure, and the guide sleeve further comprises a horizontal oil cylinder, whose cylinder body and the telescopic rod are respectively fixed on the two sections of the telescopic sleeve.

[0011] Preferably, the telescopic outer sleeve of the upper frame is also provided with a plurality of pairs of pin holes at intervals vertically, and the connecting sleeve is also provided with a plurality of pin holes which can correspond one-to-one with the above-mentioned pin holes through pins.

[0012] Preferably, the main cable clamping seat includes an upper clamping seat, a lower clamping seat and a support seat, the upper clamping seat and the lower clamping seat are arc-shaped concave structures arranged opposite to each other and just clamp and wrap the main cable, the upper clamping seat and the lower clamping seat are connected as a whole by a nut and a screw, the support seat is arranged on the top surface of the upper clamping seat, the support seats of adjacent main cable clamping seats are extended and formed into an integrated structure, and the track is arranged on the support seat.

[0013] Preferably, the contact surfaces of the upper clamping seat and the lower clamping seat are horizontally extended outward to form a connecting plate, the connecting plates of adjacent main cable clamping seats are extended and formed into an integrated structure, and the inner top surface of the upper frame is provided with a guide mechanism on both sides of the main cable, which includes a torsion-resistant seat, a clamping plate and a guide wheel, the torsion-resistant seat is fixed on the upper frame, and the bottom surface of the torsion-resistant seat is fixedly provided with a horizontal clamping plate, which extends to protrude outside the inner side surface of the torsion-resistant seat toward the main cable, and a plurality of guide wheels are provided along the length direction of the main cable on the protruding part of the clamping plate, which is located just below the connecting plate on the corresponding side and close to the lower bottom surface of the connecting plate.

[0014] Preferably, the two telescopic sleeves on the side or the two anti-torsion seats on the side are connected as one body via a connecting strut.

[0015] Preferably, the end of the telescopic rod facing the catwalk extends into the lifting device and is connected to the lifting device for subsequent construction. The end of the telescopic rod facing the catwalk has a through channel along the direction of the main cable, which is equipped with a freely movable connecting column. The lifting device is equipped with a connecting mechanism, which includes a matching block, a sealing plate, a sealing channel, a force-bearing plate, an elastic component and a matching column. The lifting device is provided with a concave channel corresponding to the position where the telescopic rod extends, and its size is just enough to accommodate the extension of the telescopic rod. The concave channel has a pair of opposite concave matching grooves along the direction of the main cable, which are the same size as the connecting column. Matching, one of the matching grooves is matched with a matching column, the matching block is just matched in the concave channel, and the matching column is fixedly connected with a sealing plate near the center of the inner side of the lifting device, which is configured to slide along the concave channel in a sealing manner, and the end of the matching column away from the concave channel is connected with a force plate through an elastic component, and a sealing channel is connected between the force plate and the sealing plate, and the sealing plate and the force plate are respectively located at two ends of the sealing channel, and the force plate is located in the sealing channel and is configured to slide along the sealing channel in a sealing manner, and its sliding direction is along the length direction of the matching column.

[0016] The present invention has at least the following beneficial effects:

[0017] 1. The present invention adopts a structure of outsourcing the catwalk, which can move the heavy objects under the catwalk vertically and horizontally, and the device will not overturn, which is convenient for disassembly and installation of the heavy objects under the catwalk.

[0018] 2. The present invention can carry heavier objects along the main cable, and can be dragged and moved by means of an external winch or oil cylinder, and can be directly pulled to move on the main cable.

[0019] 3. The present invention adopts a combination of vertical and horizontal cylinders. On the one hand, it can lift vertically to assist installation and disassembly work. On the other hand, it can move the guide sleeve horizontally to move the components suspended in the middle of the cable, and at the same time avoid the hanger and walk along the main cable.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the overall structure of the carrying device of the present invention;

[0022] Figure 2 It is a side view of the overall structure of the carrying device of the present invention;

[0023] Figure 3 It is a front view of the upper frame of the present invention;

[0024] Figure 4 It is a side view of the upper frame of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the main cable clamping seat of the present invention;

[0026] Figure 6 It is a front view of the guide sleeve of the present invention;

[0027] Figure 7 It is a side view of the guide sleeve of the present invention;

[0028] Figure 8 It is a partial structural schematic diagram of the cooperation between the lifting device and the telescopic rod of the present invention.

[0029] Description of reference numerals:

[0030] 1. Main cable, 2. Catwalk, 3. Hanging rod, 4. Lifting device, 41. Matching block, 42. Sealing plate, 43. Sealing channel, 44. Load plate, 45. Matching column, 46. Matching groove, 5. Main cable clamping seat, 51. Upper clamping seat, 52. Lower clamping seat, 53. Support seat, 54. Screw, 55. Connecting plate, 6. Upper frame, 61. Telescopic sleeve, 62. Pin hole, 63. Anti-torsion seat, 64. Clamping plate, 65. Guide wheel, 66. Connecting support, 7. Vertical cylinder, 8. Guide sleeve, 81. Connecting rod, 82. Telescopic rod, 83. Horizontal cylinder, 84. Connecting column. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0032] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] like Figures 1 to 7 As shown, the present invention provides a carrying device for an outer catwalk that can slide on a single main cable, comprising:

[0034] A main cable clamping seat 5, which is arranged at intervals along the length direction of the main cable 1, the main cable clamping seat 5 clamps the main cable 1 and is connected to the catwalk 2 below the main cable 1, and the top surfaces of the main cable clamping seats 5 support a continuous track extending along the length direction of the main cable 1;

[0035] The upper frame 6 is a square frame structure with an opening downward. The upper frame 6 is buckled on the main cable 1 through its opening and is arranged to move along the track. The upper frame 6 is buckled and symmetrically embraces the outer side of the catwalk 2. The legs of the upper frame 6 are all hollow telescopic jackets 61;

[0036] A vertical cylinder 7, one of which is provided at each top end of the upper frame 6, a total of four, the cylinder body of the vertical cylinder 7 is fixed on the upper frame 6, and the telescopic rod 82 extends downward into the telescopic sleeve 61;

[0037] The guide sleeve 8 is provided in plurality and corresponds one to one with the vertical cylinder 7. The guide sleeve 8 includes a vertical connecting rod 81 and a horizontal telescopic rod 82 connected to form an overall L-shape. The connecting rod 81 extends vertically upward into the telescopic sleeve 61 and is connected to the telescopic rod 82 of the vertical cylinder 7. The telescopic rod 82 is horizontally arranged toward the side of the catwalk 2.

[0038] The telescopic rod 82 is a two-section sleeve structure, and the guide sleeve 8 also includes a horizontal oil cylinder 83, whose cylinder body and the telescopic rod 82 are respectively fixed on the two sections of the telescopic sleeve.

[0039] In the above technical scheme, a suspension rod 3 is provided on the bottom surface of the center of the catwalk 2, and there is also a device that needs to be installed and disassembled directly below the catwalk 2, that is, a lifting device 4 for lifting heavy objects such as the heavier beam section below the catwalk 2. The working principle of the bearing device of this application: 1) A notched upper frame 6 structure is adopted, and the structure is encircled on the outside of the catwalk 2. The upper frame 6 can slide along the track preset on the upper part of the main cable clamping seat 5, and can be assisted by an external winch or oil cylinder when walking. The main cable clamping seat 5 is used to clamp the main cable 1 on the one hand, and to support the upper frame 6 on the other hand. The entire upper frame 6 falls on the track on the one hand and is buckled on the track on the other hand. 2) The vertical oil cylinder 7 can drive the guide sleeve 8 to move up and down. After moving into place, it can also be set to be fixed by a pin shaft. 3) There is a horizontally connected oil cylinder at the bottom of the guide sleeve 8, which is used to drive the telescopic rod 82 to extend and retract. The components suspended under the main cable 1 can be installed and removed by contracting the oil cylinder.

[0040] The transported object can be placed under the upper frame 6. The upper frame 6 is provided with vertical cylinders 7 in the vertical direction, which can move the transported object up and down for a short distance, and can assist in disassembly and installation. In addition, the lower part of the upper frame 6 is provided with a horizontal push cylinder and a guide sleeve 8, which can push the object horizontally. On the one hand, it solves the problem of transporting heavy objects in the air, and on the other hand, it can quickly disassemble and transport the objects under the catwalk 2.

[0041] The specific operation process is as follows: a horizontal oil cylinder 83 is provided under the upper frame 6 of the load-bearing device, which pushes the telescopic rod 82 horizontally into the lifting device 4, supports the lifting device 4, and connects with the lifting device 4, then removes the temporary pin or bolt connection between the connecting rod 81 and the telescopic sleeve 61, after which the vertical oil cylinder 7 is lowered to adjust the vertical height of the entire lifting device 4. At this time, the entire lifting device 4 cannot move forward, and direct movement will interfere with the suspension rod 3. At this time, the horizontal oil cylinder 83 moves horizontally again, and the entire lifting device 4 avoids the suspension rod 3 in the front-to-back direction, and then uses an external traction mechanism such as a winch to pull the entire device forward to another installation position. The operator is located near the horizontal oil cylinder 83 or stands and operates by setting a hanging basket.

[0042] In another technical solution, the telescopic sleeve 61 of the upper frame 6 is also provided with a plurality of pairs of pin holes 62 at intervals in a vertical direction, and the connecting sleeve is also provided with a plurality of pin holes 62 which can be connected to the above-mentioned pin holes 62 in a one-to-one correspondence through the pins. After the vertical oil cylinder 7 is telescoped to the right position, the connecting rod 81 can be detachably connected to the telescopic sleeve 61 through the pins through the one-to-one correspondence of the pin holes 62. During the movement of the entire device, the stability of the movement of the device is ensured, and it is also a protection for the vertical oil cylinder 7.

[0043] In another technical solution, the main cable clamping seat 5 includes an upper clamping seat 51, a lower clamping seat 52 and a support seat 53. The upper clamping seat 51 and the lower clamping seat 52 are arc-shaped concave structures that are arranged opposite to each other and just clamp and wrap the main cable 1. The upper clamping seat 51 and the lower clamping seat 52 are connected as a whole through a nut and a screw 54. The support seat 53 is arranged on the top surface of the upper clamping seat 51. The support seats 53 of adjacent main cable clamping seats 5 are all extended and formed into an integrated structure. The track is arranged on the support seat 53. The main cable clamping seat 5 is relatively matched with the upper and lower parts of the main cable 1 through the upper clamping seat 51 and the lower clamping seat 52, and then the main cable 1 is clamped by passing a screw 54 through the contacting sides and sleeved with a nut. The entire main cable clamping seat 5 is connected downward to the catwalk 2 to support the upper frame 6 structure, which runs on the track set on the support seat 53 of the main cable clamping seat 5.

[0044] In another technical solution, the contact surfaces of the upper clamping seat 51 and the lower clamping seat 52 are horizontally extended outward to form a connecting plate 55, and the connecting plates 55 of adjacent main cable clamping seats 5 are extended and formed into an integrated structure. The inner top surface of the upper frame 6 is provided with a guide device on both sides of the main cable 1, which includes a torsion-resistant seat 63, a clamping plate 64 and a guide wheel 65. The torsion-resistant seat 63 is fixed on the upper frame 6, and a horizontal clamping plate 64 is fixedly provided on the bottom surface of the torsion-resistant seat 63, which extends to the outside of the inner side surface of the torsion-resistant seat 63 toward the main cable 1. The protruding part of the clamping plate 64 is provided with a plurality of guide wheels 65 along the length direction of the main cable 1, which are just located directly below the connecting plate 55 on the corresponding side and close to the lower bottom surface of the connecting plate 55.

[0045] In the above technical solution, multiple main cable clamping seats 5 are arranged at intervals, and the connecting plate 55 and the support seat 53 are connected as a whole to ensure that the walking track and the guide surface of the upper frame 6 structure are an integral continuous structure. There are anti-torsion and guiding devices between the upper frame 6 and the main cable clamping seat 5 to avoid torsional swing caused by imbalance caused by the change of the center of gravity of the load-bearing object. The guiding mechanism is symmetrically arranged on both sides of the main cable 1, and the guide wheel 65 is closely attached to the connecting plate 55. During the movement of the entire load-bearing device, the upper frame 6 can move stably along the track to prevent torsion and swing, and protect the safety of the load-bearing object below during the lifting, moving, installation and removal operations.

[0046] In another technical solution, the two telescopic sleeves 61 on the side or the two anti-torsion seats 63 on the side are connected as a whole through a connecting support 66, so that the structural strength of the entire upper frame 6 can better meet the requirements.

[0047] In another technical solution, Figure 8As shown, the end of the telescopic rod 82 facing the catwalk extends into the lifting device 4 and is connected to the lifting device 4 for subsequent construction. The end of the telescopic rod 82 facing the catwalk has a through channel along the direction of the main cable 1, in which a freely movable connecting column 84 is matched. The lifting device 4 is matched with a connecting mechanism, which includes a matching block 41, a sealing plate 42, a sealing channel 43, a force plate 44, an elastic component and a matching column 45. The lifting device 4 is provided with a concave channel corresponding to the position where the telescopic rod 82 extends, and its size just accommodates the extension of the telescopic rod 82. The concave channel has a pair of opposite concave matching grooves 46 along the direction of the main cable 1, which match the size of the connecting column 84. A matching column 45 is matched in one of the matching grooves 46, and the matching block 41 fits exactly in the recessed channel, and the matching column 45 is fixedly connected with a sealing plate 42 near the center of the inner side of the lifting device 4, which is configured to slide sealingly along the recessed channel, and the end of the matching column 45 away from the recessed channel is connected to a force-bearing plate 44 through an elastic component, and a sealing channel 43 is connected between the force-bearing plate 44 and the sealing plate 42, and the sealing plate 42 and the force-bearing plate 44 are respectively located at two ends of the sealing channel 43, and the force-bearing plate 44 is located in the sealing channel 43 and is configured to slide sealingly along the sealing channel 43, and its sliding direction is along the length direction of the matching column 45.

[0048] In the above technical solution, the telescopic rod 82 realizes automatic matching and stable connection by pressing the matching block 41 inward. Figure 8 In the state shown, when connection is required, it is only necessary to push the telescopic rod 82 to the left to squeeze the matching block 41, and the sealing channel 43 is approximately in a sealed vacuum state. A sealing pad can be set on the sealing plate 42 and the force plate 44 to increase the sealing effect. The matching block 41 pushes the sealing plate 42 to compress the air in the sealing channel 43, thereby pushing the force plate 44 upward, and the force plate 44 compresses the elastic component. The elastic component is in a compressed state until the two ends of the connecting column 84 of the telescopic rod 82 move to face a pair of matching grooves 46, and the compressed state of the elastic component is released, pushing the connecting column 84 to move upward into the matching groove 46, and the matching column 45 enters the corresponding position released by the connecting column 84, so as to realize the connection between the telescopic rod 82 and the lifting device 4. When the connection needs to be released, it is only necessary to release the air in the sealing channel 43 to achieve the relaxation of the elastic component, and then move the connecting column 84 and the matching column 45 to return to the initial state. The sealing channel 43 can also use an air bag instead of squeezing the gas to achieve the force of the force plate 44.

[0049] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A carrying device for an external catwalk that can slide on a single main cable, characterized in that: include: A main cable clamping seat, which is arranged in plurality at intervals along the length direction of the main cable, the main cable clamping seat clamps the main cable and is connected to the catwalk below the main cable, and the top surfaces of the plurality of main cable clamping seats support a continuous track extending along the length direction of the main cable; The upper frame is a square frame structure with an opening downward. The upper frame is buckled on the main cable through its opening and is arranged to move along the track. After being buckled, the upper frame symmetrically embraces the outer side of the catwalk. The legs of the upper frame are all telescopic jackets with hollow interiors. A vertical oil cylinder, one of which is provided at each top end of the upper frame, the cylinder body of the vertical oil cylinder being fixed to the upper frame, and the telescopic rod extending downward into the telescopic sleeve; A plurality of guide sleeves are provided and correspond to the vertical oil cylinders one by one. The guide sleeves include a vertical connecting rod and a horizontal telescopic rod connected to form an overall L-shape. The connecting rod vertically extends upward into the telescopic sleeve and is connected to the telescopic rod of the vertical oil cylinder. The telescopic rod is horizontally arranged toward the catwalk side. The telescopic rod is a two-section sleeve structure, and the guide sleeve also includes a horizontal oil cylinder, whose cylinder body and the telescopic rod are respectively fixed on the two sections of the sleeve of the telescopic rod; The telescopic outer sleeve of the upper frame is also provided with a plurality of pairs of pin holes at intervals in a vertical direction, and the connecting rod is also provided with a plurality of pin holes which can correspond to the pin holes one by one and be connected through pins.

2. The carrying device of the outer catwalk capable of sliding on a single main cable as claimed in claim 1, characterized in that: The main cable clamping seat includes an upper clamping seat, a lower clamping seat and a support seat. The upper clamping seat and the lower clamping seat are arc-shaped concave structures that are arranged opposite to each other and just clamp and wrap the main cable. The upper clamping seat and the lower clamping seat are connected as a whole through a nut and a screw. The support seat is arranged on the top surface of the upper clamping seat. The support seats of adjacent main cable clamping seats are extended and formed into an integrated structure. The track is arranged on the support seat.

3. The carrying device of the outer catwalk capable of sliding on a single main cable as claimed in claim 2, characterized in that: The contact surfaces of the upper clamping seat and the lower clamping seat are both extended horizontally outward to form a connecting plate, and the connecting plates of adjacent main cable clamping seats are extended and formed into an integrated structure. The inner top surface of the upper frame is provided with a guide mechanism on both sides of the main cable, which includes an anti-torsion seat, a clamping plate and a guide wheel. The anti-torsion seat is fixed on the upper frame, and a horizontal clamping plate is fixedly provided on the bottom surface of the anti-torsion seat, which extends to protrude outside the inner side surface of the anti-torsion seat toward the main cable. A plurality of guide wheels are provided along the length direction of the main cable on the protruding part of the clamping plate, which is located just below the connecting plate on the corresponding side and is close to the lower bottom surface of the connecting plate.

4. The carrying device of the outer catwalk capable of sliding on a single main cable as claimed in claim 1 or 3, characterized in that: The two telescopic jackets on the side or the two anti-torsion seats on the side are connected as a whole through a connecting support.

5. The carrying device of the outer catwalk capable of sliding on a single main cable as claimed in claim 1, characterized in that: The end of the telescopic rod facing the catwalk extends into the lifting device and is connected to the lifting device for subsequent construction. The end of the telescopic rod facing the catwalk has a through channel along the main cable direction, which is matched with a freely movable connecting column. The lifting device is matched with a connecting mechanism, which includes a matching block, a sealing plate, a sealing channel, a force plate, an elastic component and a matching column. The lifting device is provided with a concave channel corresponding to the position where the telescopic rod extends, and its size is just enough to accommodate the extension of the telescopic rod. The concave channel has a pair of opposite concave matching grooves along the main cable direction, which match the size of the connecting column. A matching column is matched in one of the matching grooves, and the matching block is just matched in the concave channel, and a sealing plate is fixedly connected to the matching column near the center of the inner side of the lifting device, which is configured to slide along the concave channel in a sealing manner, and the end of the matching column away from the concave channel is connected to a force-bearing plate through an elastic component, and a sealing channel is connected between the force-bearing plate and the sealing plate, and the sealing plate and the force-bearing plate are respectively located at two ends of the sealing channel, and the force-bearing plate is located in the sealing channel and is configured to slide along the sealing channel in a sealing manner, and its sliding direction is along the length direction of the matching column.

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