Auxiliary device for turning over arch rib sections

Abstract

The utility model provides an arch rib section turning-over auxiliary device which comprises a portal crane and a rail flat car, the portal crane comprises a lifting hook, and the lifting hook is connected with a lifting rope used for lifting an arch rib; the rail flat car comprises a rail, a flat car body, a buffer pad and a supporting pier, the rail is arranged below the lifting hook, the flat car body is arranged on the rail and can move along the rail, the top face of the flat car body is provided with a first supporting part and a second supporting part which are oppositely arranged, the first supporting part is used for supporting the arch rib, and the buffer pad is arranged on the second supporting part; the supporting piers and the flatcar are arranged at intervals, and the supporting piers are located on the sides, back to the cushion, of the first supporting parts. Before the gravity center of the arch rib changes suddenly, the position of the flatcar can be adjusted to ensure that the lifting point and the flatcar are on the same vertical line, so that the gravity center of the arch rib section does not generate pulling force on the gantry crane when the gravity center changes suddenly, and meanwhile, the economic cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically to an auxiliary device for turning over arch rib segments. Background Technology

[0002] In the construction of steel-reinforced concrete arch bridges, the arch rib segments of steel pipe arch ribs are characterized by their large volume, heavy weight, and inherent curvature. To improve on-site construction efficiency, meet economic requirements, and reduce construction safety risks, the on-site "horizontal assembly" process is widely adopted in the arch rib fabrication. However, before the arch rib segments are hoisted to the bridge site, they need to be turned from a horizontal position to an vertical position. Currently, the main measures taken for turning arch rib segments include cable crane turning, floating crane turning, and gantry crane turning, all of which can complete the turning operation well. However, the above methods all have their own limitations, specifically:

[0003] Cable-stayed rigging offers advantages such as flexibility, ease of use, high efficiency, safety, and precise positioning. However, the main body and auxiliary facilities of cable-stayed rigging systems occupy a significant amount of land, negatively impacting subsequent construction in the occupied area. Although the technology is mature, the overall cost of cable-stayed rigging is relatively high, making it suitable for large-span arch bridge projects with relatively wide construction work areas.

[0004] Floating cranes are highly mobile and flexible in operation, but their operating costs are generally high. During the lifting process, the impact of water flow speed on the lifting must be considered to maintain the stability of the arch rib positioning. Multiple vessels are required to work together, including heavy-duty floating crane vessels, tractor vessels, flatbed vessels, and deep-sea transport vessels. It is also necessary to ensure that the floating crane vessel is not affected by the aforementioned vessels. Two floating crane vessels working together to lift the arch rib segment make the entire process difficult to operate and susceptible to the limitations of the on-site working space and the influence of water flow.

[0005] Gantry cranes are common lifting machinery on construction sites. They are easy to operate, have a large lifting capacity, and relatively low operating costs. However, during turning operations, the sudden change in the center of gravity of the arch rib segment generates a pulling force on the gantry crane, causing significant swaying and compromising its stability. This poses a high safety risk on the construction site. Therefore, the use of gantry cranes for turning arch rib segments requires a high level of operator skill. Utility Model Content

[0006] The present invention aims to solve the above-mentioned technical problems and provide an auxiliary device for turning over arch rib segments, which can reduce the safety risks at the construction site and control the economic costs of turning over arch rib segments.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] An auxiliary device for turning over arch rib segments includes a gantry crane and a rail flatcar. The gantry crane includes a hook with a lifting rope for lifting the arch rib connected to the hook. The rail flatcar includes a track, a flatcar, a buffer pad, and a support block. The track is installed below the hook, and the flatcar is mounted on the track and can move along the track. The top surface of the flatcar has a first support portion and a second support portion arranged opposite to each other. The first support portion is used to support the arch rib, and the buffer pad is installed on the second support portion. The support block is spaced apart from the flatcar and is located on the side of the first support portion facing away from the buffer pad.

[0009] Furthermore, the buffer pad includes a supporting sleeper and a rubber pad, the supporting sleeper being fixed to the second support part, and the rubber pad being fixed to the top surface of the supporting sleeper.

[0010] Furthermore, the hoisting rope includes a steel wire rope and two slings. The steel wire rope is hooked onto the hoisting hook, and the two slings are respectively connected to the opposite ends of the steel wire rope. The two slings are used to wrap around and connect to the arch rib.

[0011] Furthermore, the diameter of the wire rope is 60mm.

[0012] Furthermore, a support base is fixed on the first support part, and a rotating groove is recessed on the top surface of the support base. In the initial state, the chord on one side of the bottom surface of the arch rib is rotatably placed in the rotating groove.

[0013] Furthermore, the flatcar includes a frame, wheels, and a driving mechanism. The wheels are rotatably mounted on the bottom of the frame and mounted on the track. The driving mechanism is mounted on the frame and connected to the wheels to drive the wheels to rotate, thereby causing the flatcar to move along the track.

[0014] Furthermore, the supporting pier is a steel pier.

[0015] Furthermore, in the initial state, one end of the arch rib is connected to the hook via the lifting rope, and the opposite sides of the bottom surface of the arch rib are respectively supported on the first support and the support pier. When the gantry crane lifts the arch rib via the hook, the flatcar moves along the track to the lifting point position according to the change of the turning angle of the arch rib until the center of gravity of the arch rib suddenly changes and falls on the buffer pad, thus completing the turning.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] When using the aforementioned arch rib segment turning auxiliary device for arch rib turning, the turning of the arch rib is completed by lifting with a gantry crane and sliding the flatcar along the track. The overall construction process is simple and quick, and the arch rib turning can be completed within 20 minutes, effectively solving the problems of limited site space and the impact of tidal conditions in shallow coastal areas. At the same time, before the center of gravity of the arch rib changes suddenly when the angle between the arch rib segment and the ground approaches 80°, the position of the flatcar can be adjusted to ensure that the lifting point and the flatcar are on a vertical line, so that the lifting rope is not pulled at an angle. This ensures that the center of gravity of the arch rib segment does not exert a pulling force on the gantry crane when it suddenly changes, avoiding large swaying of the gantry crane and endangering its stability, thus reducing construction safety risks. In addition, the use of gantry crane and track flatcar to assist in the turning of arch rib segments reduces economic costs compared to the existing cable hoisting and floating crane turning methods. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the arch rib segment turning auxiliary device according to a preferred embodiment of the present invention.

[0019] Figure 2 for Figure 1 A schematic diagram of the flatcar structure in the arch rib segment turning auxiliary device shown;

[0020] Figure 3 This is a schematic diagram of the state when the arch rib segment is hoisted in a horizontal position in a preferred embodiment of this utility model.

[0021] Figure 4 This is a schematic diagram of the state of the arch rib segment during the overturning process in a preferred embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of the state of the arch rib segment after it has completed its overturning in a preferred embodiment of this utility model;

[0023] In the attached diagram, 100 is the arch rib segment turning auxiliary device; 10 is the gantry crane; 12 is the hook; 20 is the rail flatcar; 21 is the rail; 22 is the flatcar; 221 is the frame; 223 is the traveling wheel; 225 is the first support part; 227 is the second support part; 23 is the buffer pad; 231 is the support sleeper; 232 is the rubber pad; 25 is the support base; 251 is the rotating groove; 30 is the support pier; 50 is the hoisting rope; 51 is the wire rope; 53 is the sling; 200 is the arch rib segment; 210 is the first upper chord; 220 is the second upper chord; 230 is the first lower chord; 240 is the second lower chord; 250 is the upper connecting tube; 260 is the lower connecting tube; 270 is the first web member; and 280 is the second web member. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figure 1 This utility model provides a preferred embodiment of an arch rib segment turning auxiliary device 100, including a gantry crane 10, a rail flatcar 20, and a support pier 30. The rail flatcar 20 is located below the hook 12 of the gantry crane 10, and the support pier 30 is located near the rail flatcar 20 to cooperate with the rail flatcar 20 to support the arch rib segment 200. The structure of the gantry crane 10 is prior art and will not be described in detail here for brevity. Please refer to [reference needed]. Figure 3 In this embodiment, the arch rib segment 200 is an arch rib segment of a steel pipe arch rib. The structure of the arch rib segment of the steel pipe arch rib is the prior art, which includes a first upper chord 210 and a second upper chord 220 arranged opposite to each other, a first lower chord 230 and a second lower chord 240 arranged opposite to each other, an upper connecting tube 250 connecting the first upper chord 210 and the second upper chord 220, a lower connecting tube 260 connecting the first lower chord 230 and the second lower chord 240, a first web member 270 connecting the first upper chord 210 and the first lower chord 230, and a second web member 280 connecting the second upper chord 220 and the second lower chord 240.

[0028] A lifting rope 50 for lifting the arch rib segment 200 is connected to the hook 12 of the gantry crane 10. The lifting rope 50 includes a wire rope 51 and two lifting straps 53. The wire rope 51 is hooked onto the hook 12, and the two lifting straps 53 are respectively connected to the opposite ends of the wire rope 51. The two lifting straps 53 are used to wrap around and connect to the arch rib segment 200. In this embodiment, the diameter of the wire rope 51 is 60mm.

[0029] Please see also Figure 2 The rail flatcar 20 includes a rail 21, a flatcar 22, and a buffer pad 23. The rail 21 is installed below the hook 12, and the flatcar 22 is installed on the rail 21 and can move along the rail 21. In this embodiment, the flatcar 22 includes a frame 221, wheels 223, and a driving component (not shown). The wheels 223 are rotatably mounted on the bottom of the frame 221 and are mounted on the rail 21. The driving component is installed on the frame 221 and connected to the wheels 223 to drive the wheels 223 to rotate, thereby causing the flatcar 22 to move along the rail 21. The driving component can be a motor or the like, which can be connected to the wheels 223 through a transmission component such as a gearbox to drive the wheels 223 to rotate. It is understood that the rail flatcar 20 may also include other components, such as a power control box mounted on the frame 221 that provides power to the travel drive and controls the operation of the travel drive. The travel drive and the power control box are existing technologies and will not be described in detail here for the sake of brevity.

[0030] The flatcar 22 has a first support portion 225 and a second support portion 227 arranged opposite to each other on its frame 221. The first support portion 225 is used to support the arch rib segment 200. In this embodiment, a support base 25 is fixed on the first support portion 225. The top surface of the support base 25 is recessed with a rotation groove 251. During the turning process of the arch rib segment 200, the chord on one side of the bottom surface of the arch rib segment 200 is rotatably placed in the rotation groove 251 to provide a rotation fulcrum for the turning of the arch rib segment 200, and at the same time limit the position of the arch rib segment 200 during rotation and turning. A buffer pad 23 is installed on the second support portion 227. In this embodiment, the buffer pad 23 includes a support sleeper 231 and a rubber pad 232. The support sleeper 231 is fixed on the second support portion 227, and the rubber pad 232 is fixed on the top surface of the support sleeper 231. The support pier 30 is spaced apart from the flatcar 22, and the support pier 30 is located on the side of the first support part 225 facing away from the buffer pad 23. In this embodiment, the support pier 30 is a steel pier.

[0031] When assembling the arch rib segment turning auxiliary device 100, firstly, a track 21 is laid out on the hardened ground, and the flatcar 22 is installed on the track 21 so that the traveling wheels 223 of the flatcar 22 roll in contact with the track 21; then, the buffer pad 23 and the support base 25 are fixed on the top surface of the frame 221 of the flatcar 22 by welding or bolting, etc., and the turning operation is awaited.

[0032] Please see also Figures 3 to 5 When the arch rib segment turning auxiliary device 100 is used to assist in turning the arch rib segment 200, in the initial state, one end of the arch rib segment 200 is connected to the hook 12 via the lifting rope 50. The opposite sides of the bottom surface of the arch rib segment 200 are supported on the first support part 225 and the support pier 30, respectively. When the gantry crane 10 lifts the arch rib segment 200 via the hook 12, the flatcar 22 moves along the track 21 towards the lifting point position according to the change in the turning angle of the arch rib segment 200, until the center of gravity of the arch rib segment 200 suddenly changes and lands on the buffer pad 23, completing the turning. Specifically, it roughly includes the following steps:

[0033] S1, the arch rib segment 200 is lifted in a horizontal position by the gantry crane 10, so that the first upper chord 210 and the first lower chord 230 of the arch rib segment 200 are facing down, and the second upper chord 220 and the second lower chord 240 are facing up, until the first upper chord 210 of the arch rib segment 200 is placed in the rotation groove 251 of the support base 25, and the first lower chord 230 of the arch rib segment 200 is placed on the support pier 30, ensuring that the arch rib segment 200 is placed stably.

[0034] S2, use sling 53 to wrap around the first lower chord 230 and the second lower chord 240 of the arch rib segment 200, and then connect sling 53 to a 60mm diameter wire rope 51 through a shackle, and connect the wire rope 51 to the hook 12 of the gantry crane 10.

[0035] S3, when the gantry crane 10 slowly lifts the hook, the first lower chord 230 of the arch rib segment 200 gradually moves away from the support pier 30, and the first upper chord 210 of the arch rib segment 200 rotates within the rotating groove 251. The turning angle of the arch rib segment 200 (i.e., the angle between the arch rib segment 200 and the ground) changes accordingly. During this process, the flatcar 22 moves along the track 21 towards the lifting point position according to the change in the turning angle of the arch rib segment 200. When the angle between the arch rib segment 200 and the ground approaches 80°, the on-site operators quickly adjust the position of the flatcar 22 to ensure that the lifting point (i.e., the position of the hook 12) and the flatcar 22 are approximately on a vertical line, ensuring that the sling 53 is not pulled obliquely. When the angle between the arch rib segment 200 and the ground is approximately 80°, the center of gravity of the arch rib segment 200 undergoes a sudden change, and the second upper chord 220 rests on the buffer pad 23 supported on the flatcar 22. The turning process ends, and at this point, the arch rib segment 200 is in an upright position. Figure 5As shown. After the turning process is completed, the gantry crane 10 slowly lifts the hook to make the arch rib segment 200 separate from the support base 25 and the buffer pad 23, and the flatcar 22 is driven away from the arch rib segment 200 by the traveling drive component.

[0036] In the existing technology, the following problems often exist in the turning operation of the arch rib segment 200: First, the center of gravity of the arch rib segment 200 changes gradually as the turning process progresses, until the center of gravity changes abruptly, which will generate a pulling force on the gantry crane 10, causing the gantry crane 10 to sway significantly; Second, the wire rope 51 comes into contact with the paint coating on the surface of the arch rib segment 200, causing damage to the paint.

[0037] When using the above-mentioned arch rib segment turning auxiliary device 100 to turn the arch rib segment 200, the arch rib segment 200 is turned by lifting with a gantry crane 10 and sliding with a flat car 22 along the track 21. The overall construction process is simple and quick, and the turning of the arch rib segment 200 can be completed within 20 minutes, effectively solving the problems of limited space at the construction site and the impact of the tides in the shallow coastal area. Meanwhile, before the center of gravity of the arch rib segment 200 suddenly changes when the angle between the arch rib segment 200 and the ground approaches 80°, the position of the flatcar 22 can be adjusted to ensure that the lifting point and the flatcar 22 are on the same vertical line. This prevents the lifting rope 50 from being pulled at an angle, so that the sudden change in the center of gravity of the arch rib segment 200 will not generate a pulling force on the gantry crane 10, avoiding large swaying of the gantry crane 10 and endangering its stability, thus reducing construction safety risks. At the same time, using the gantry crane 10 and the rail flatcar 20 to assist in turning the arch rib segment 200 reduces economic costs compared to the existing cable hoisting and floating crane turning methods.

[0038] In this embodiment, the arch rib segment turning auxiliary device 100 uses a sling 53 to contact the surface of the arch rib segment 200. Compared with the wire rope 51, the contact area between the sling 53 and the arch rib segment 200 is larger, and the force exerted by the sling 53 on the arch rib segment 200 is dispersed, avoiding damage to the paint coating on the surface of the arch rib segment 200 during the hoisting process.

[0039] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A turning assist device for arch rib segments, characterized in that: The system includes a gantry crane and a rail flatcar. The gantry crane includes a hook with a lifting rope for lifting arch rib segments connected to it. The rail flatcar includes a rail, a flatcar, a buffer pad, and a support block. The rail is installed below the hook, and the flatcar is mounted on the rail and can move along the rail. The top surface of the flatcar has a first support portion and a second support portion arranged opposite to each other. The first support portion is used to support the arch rib segments, and the buffer pad is installed on the second support portion. The support pier is spaced apart from the flatcar, and the support pier is located on the side of the first support part that faces away from the buffer pad.

2. The arch rib segment turning aid device as described in claim 1, characterized in that: The buffer pad includes a supporting sleeper and a rubber pad. The supporting sleeper is fixed to the second support part, and the rubber pad is fixed to the top surface of the supporting sleeper.

3. The arch rib segment turning aid device as described in claim 1, characterized in that: The hoisting rope includes a steel wire rope and two slings. The steel wire rope is hooked onto the hook, and the two slings are respectively connected to the opposite ends of the steel wire rope. The two slings are used to wrap around and connect to the arch rib segment.

4. The arch rib segment turning aid device as described in claim 3, characterized in that: The diameter of the steel wire rope is 60mm.

5. The arch rib segment turning aid device as described in claim 1, characterized in that: A support base is fixed on the first support part, and a rotating groove is recessed on the top surface of the support base. In the initial state, the chord on one side of the bottom surface of the arch rib segment is rotatably placed in the rotating groove.

6. The arch rib segment turning aid device as described in claim 1, characterized in that: The flatcar includes a frame, wheels, and a drive mechanism. The wheels are rotatably mounted on the bottom of the frame and mounted on the track. The drive mechanism is mounted on the frame and connected to the wheels to drive them to rotate, thereby moving the flatcar along the track.

7. The arch rib segment turning aid device as described in claim 1, characterized in that: The supporting pier is a steel pier.

8. The arch rib segment turning aid device as described in claim 1, characterized in that: In the initial state, one end of the arch rib segment is connected to the hook via the lifting rope. The opposite sides of the bottom surface of the arch rib segment are supported on the first support and the support pier, respectively. When the gantry crane lifts the arch rib segment via the hook, the flatcar moves along the track toward the lifting point according to the change in the turning angle of the arch rib segment until the center of gravity of the arch rib segment suddenly changes and lands on the buffer pad, thus completing the turning.

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