Steel wire rope binding structure of old bridge demolition concrete box girder segment

Abstract

This invention provides a wire rope binding structure for demolishing concrete box girder segments of old bridges. The structure includes concrete box girder segments and wire ropes. The concrete box girder segments are formed by a top plate, a bottom plate, and two side webs. The top plate extends outwards on both sides to form flanges. Several sets of lifting holes are spaced along the longitudinal direction of the bridge on opposite sides of the concrete box girder segments. Each set of lifting holes includes a top opening on the top plate, an edge opening on the flange, and a side opening on the side web. A wire rope for lifting is threaded through each set of lifting holes, sequentially passing through the top opening, edge opening, and side opening of the corresponding set of lifting holes. Both ends of the wire rope are used to connect to the hook of a lifting device. This structure allows for a reduction in the diameter of the lifting wire rope when lifting a weight exceeding 200 tons, enabling the use of commercially available wire ropes while reducing safety risks during the lifting process and ensuring safety.

Description

Technical Field

[0001] This invention relates to the field of old bridge demolition construction technology, and in particular to a wire rope binding structure for concrete box girder segments during the demolition of old bridges. Background Technology

[0002] In existing technologies, the hoisting of structures such as concrete box girder segments generally employs a double-lifting-point, two-wire-rope bottom-lifting method. For example... Figure 1-2 As shown, the hoisting of a small concrete box girder segment 10 typically involves a lifting weight of around 120t, using a safety factor of 6. The diameter of the steel wire rope used should not exceed Ф60mm. However, when the lifting weight of the structure exceeds 200t, such as in the demolition of cantilevered box girder segments of an old bridge, this traditional bottom-lifting method is used. Figure 3-4 As shown, the diameter of the wire rope should be at least 84mm. Large-diameter wire ropes are not commonly found on the market and need to be custom-made, resulting in high usage costs. In addition, the stiffness of large-diameter wire ropes is high, requiring a large arc at the bottom of the beam for turning and transition. They cannot be tightly wrapped around the beam and are prone to slipping. The steel guard feet of the wire rope protection device at the bottom of the beam are difficult to install and position, and the wire rope is easily cut during hoisting. Furthermore, due to the short segment length, generally 3m to 4m, unlike the common length of 30m or 40m for small precast box girders, rotation around the longitudinal axis and upward tilting are likely to occur during hoisting, creating significant safety risks. Summary of the Invention

[0003] To address the issues of high cost, significant safety risks, and limited practicality associated with traditional wire rope binding methods for lifting large structures (weights exceeding 200t), which require wire ropes with a diameter of 80mm or more, a simplified design has been developed to reduce the diameter of the wire rope used for lifting weights exceeding 200t. This allows the use of commonly available wire ropes while simultaneously reducing safety risks during the lifting process and ensuring safety throughout the lifting operation.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A wire rope binding structure for demolishing concrete box girder segments of an old bridge includes concrete box girder segments and wire ropes. The concrete box girder segments are formed by a top plate, a bottom plate, and two side webs. The two sides of the top plate extend outward to form flanges. Several sets of hoisting holes are provided on opposite sides of the concrete box girder segments, spaced apart along the longitudinal direction of the bridge. Each set of hoisting holes includes a top opening on the top plate, an edge opening on the flange, and a side opening on the side web. A hoisting wire rope is threaded through each set of hoisting holes. The wire rope sequentially passes through the top opening, the edge opening, and the side opening of the corresponding set of hoisting holes. Both ends of the wire rope are used to connect to the hooks of a hoisting device.

[0006] Furthermore, each of the concrete box girder segments has 2-4 sets of hoisting holes arranged at intervals along the longitudinal direction of the bridge on its opposite sides.

[0007] Furthermore, the wire rope is a single wire rope.

[0008] Furthermore, the single steel wire rope is doubled before passing through the corresponding hoisting hole.

[0009] The present invention further provides a wire rope binding structure for demolishing concrete box girder segments of old bridges, including concrete box girder segments and wire ropes. The concrete box girder segments are formed by a top plate, a bottom plate, and two side webs. The two sides of the top plate extend outward to form flanges. Several sets of hoisting holes are provided on opposite sides of the concrete box girder segments, arranged at intervals along the longitudinal direction of the bridge. Each set of hoisting holes includes a top opening on the top plate and a side opening on the side webs. A hoisting wire rope is threaded through each set of hoisting holes. One end of the wire rope is used to connect to the hook of a hoisting device, and the other end of the wire rope passes through the top opening and the side opening in sequence, wraps around the outer side of the flange, and then connects to the hook of the hoisting device.

[0010] Furthermore, each of the concrete box girder segments has 2-4 sets of hoisting holes arranged at intervals along the longitudinal direction of the bridge on its opposite sides.

[0011] Furthermore, the wire rope is a single wire rope.

[0012] Furthermore, the single steel wire rope is doubled before passing through the corresponding hoisting hole.

[0013] By adopting the above technical solution, the present invention has the following beneficial effects:

[0014] The steel wire rope binding structure for the demolition of concrete box girder segments of old bridges of the present invention changes the traditional bottom-lifting method to a web-lifting method by drilling holes in the web of the concrete box girder segments during demolition. This avoids the slippage of the steel wire rope. At the same time, the web lifting holes added to the concrete box girder segments increase the number of load-bearing legs of the lifting steel wire rope, thereby reducing the diameter of the steel wire rope and increasing the safety of the lifting process, reducing the lifting cost, and making the lifting construction convenient and quick. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the hoisting process of small concrete box girder segments in existing technologies.

[0016] Figure 2 for Figure 1 The main view;

[0017] Figure 3This is a schematic diagram illustrating the hoisting process of a cantilevered box girder segment during the demolition of an old bridge, using existing technology.

[0018] Figure 4 for Figure 3 The main view;

[0019] Figure 5 This is a schematic diagram of the steel wire rope binding structure of a concrete box girder segment for demolishing an old bridge, according to a preferred embodiment of the present invention.

[0020] Figure 6 A schematic diagram of the wire rope binding structure for the demolition of a concrete box girder segment of an old bridge, according to a preferred embodiment of the present invention.

[0021] Figure 7 for Figure 6 The main view;

[0022] Figure 8 for Figure 6 The diagram shows the structure when the wire rope is threaded through the hoisting hole in a double-strand configuration.

[0023] Figure 9 This is a schematic diagram of the steel wire rope binding structure for a concrete box girder segment during the demolition of an old bridge, according to another embodiment of the present invention.

[0024] Figure 10 This is a schematic diagram of the steel wire rope binding structure for the demolition of a concrete box girder segment of an old bridge, according to another embodiment of the present invention.

[0025] Explanation of main component symbols

[0026] 10. Concrete box girder segment; 11. Top slab; 12. Bottom slab; 13. Side web; 14. Diaphragm; 15. Flange plate; 16. Box cell; 30. Lifting hole; 31. Top opening; 32. Edge opening; 33. Side opening; 40. Wire rope. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] 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.

[0029] 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 in the description of the invention 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.

[0030] Please also see Figures 5 to 7 A preferred embodiment of the present invention provides a wire rope binding structure for demolishing concrete box girder segments of an old bridge, comprising a concrete box girder segment 10 and a wire rope 40 for hoisting the concrete box girder segment 10 threaded through the concrete box girder segment 10.

[0031] The concrete box girder segment 10 is a hollow box girder structure formed by a top plate 11, a bottom plate 12, and two side webs 13. Specifically, the top plate 11 and the bottom plate 12 are arranged opposite each other, and the two side webs 13 are arranged opposite each other and connect the top plate 11 and the bottom plate 12. The two sides of the top plate 11 extend outward to form flanges 15. A partition 14 is fixed in the hollow cavity of the concrete box girder segment 10. In this embodiment, the partition 14 divides the hollow cavity of the concrete box girder segment 10 into two chambers 16 arranged along the transverse direction of the bridge. The structure of the concrete box girder segment 10 is prior art and will not be described in detail here for brevity. Several sets of hoisting holes 30 are provided on opposite sides of the concrete box girder segment 10, arranged at intervals along the longitudinal direction of the bridge. Each set of hoisting holes 30 includes a top opening 31 opened on the top plate 11, an edge opening 32 opened on the flange 15, and a side opening 33 opened on the side webs 13. The lifting hole 30 serves as a lifting point for the concrete box girder segment 10, facilitating the insertion of the wire rope 40. In this embodiment, the lifting holes 30 are drilled in the top plate 11, web plate, and flange plate 15 of the box girder using a water-cooled drill.

[0032] A hoisting wire rope 40 is threaded through each set of hoisting holes 30. The wire rope 40 sequentially passes through the top opening 31, edge opening 32, and side opening 33 of the corresponding set of hoisting holes 30. Both ends of the wire rope 40 are used to connect to the hook of a hoisting device (not shown). The hoisting device can be a truck crane, floating crane, gantry crane, or other existing hoisting equipment. Specifically, 2-4 sets of hoisting holes 30 arranged at intervals along the longitudinal direction are provided on each side of the concrete box girder segment 10. In this embodiment, when 4 sets of hoisting holes 30 arranged at intervals along the longitudinal direction are provided on each side of the concrete box girder segment 10, a single wire rope 40 can be used for hoisting. Please refer to... Figure 8 When two sets of hoisting holes 30 are arranged at intervals along the longitudinal direction on opposite sides of the concrete box girder segment 10, a single steel wire rope 40 can be doubled and then passed through the corresponding hoisting hole 30 for hoisting.

[0033] Please also see Figures 9 to 10 Another embodiment of the present invention provides a wire rope binding structure for demolishing concrete box girder segments of old bridges, including a concrete box girder segment 10 and a wire rope 40 for hoisting the concrete box girder segment 10 threaded through the concrete box girder segment 10.

[0034] The concrete box girder segment 10 is a hollow box girder structure formed by a top plate 11, a bottom plate 12, and two side webs 13. Specifically, the top plate 11 and the bottom plate 12 are arranged opposite each other, and the two side webs 13 are arranged opposite each other and connect the top plate 11 and the bottom plate 12. The two sides of the top plate 11 extend outward to form flange plates 15. A partition 14 is fixed in the hollow cavity of the concrete box girder segment 10. In this embodiment, the partition 14 divides the hollow cavity of the concrete box girder segment 10 into two chambers 16 arranged along the transverse direction of the bridge. The structure of the concrete box girder segment 10 is prior art and will not be described in detail here for brevity. Several sets of hoisting holes 30 are provided on opposite sides of the concrete box girder segment 10, arranged at intervals along the longitudinal direction of the bridge. Each set of hoisting holes 30 includes a top opening 31 opened on the top plate 11 and a side opening 33 opened on the side webs 13. The lifting hole 30 serves as a lifting point for the concrete box girder segment 10, facilitating the insertion of the wire rope 40. In this embodiment, the lifting holes 30 are drilled in the top plate 11 and web of the box girder using a water-cooled drill.

[0035] A hoisting wire rope 40 is threaded through each set of hoisting holes 30. One end of the wire rope 40 is connected to the hook of a hoisting device, and the other end of the wire rope 40 passes through the top opening 31 and the side opening 33 in sequence, wraps around the outer side of the flange plate 15, and then connects to the hook of the hoisting device. Specifically, in this embodiment, when there are four sets of hoisting holes 30 arranged at intervals along the longitudinal direction on opposite sides of the concrete box girder segment 10, a single wire rope 40 can be used for hoisting. When there are two sets of hoisting holes 30 arranged at intervals along the longitudinal direction on opposite sides of the concrete box girder segment 10, a single wire rope 40 can be doubled and then passed through the corresponding hoisting hole 30 for hoisting. In this embodiment, the outer side of the steel wire rope 40 and the part in contact with the inner wall of the lifting hole 30 are also wrapped with flexible parts such as cloth strips and rubber strips to prevent the outer side of the flange plate 15 of the beam or the sharp corners of the lifting hole 30 from cutting the steel wire rope and causing the steel wire rope to break.

[0036] Traditional bottom-mounted cranes require the use of steel wire ropes with a diameter of 80mm or more for lifting structures with a lifting capacity exceeding 200t. However, large-diameter steel wire ropes are hard, uncommon, and easily consumable, resulting in high operating costs. Due to their high hardness, they cannot be tightly bound to the structure during the binding process, making them prone to slippage. Furthermore, the steel protective feet of the steel wire rope protection device at the bottom of the beam are difficult to install and position, and the steel wire rope is easily damaged during lifting, posing significant safety risks. In addition, their heavy weight results in low drilling efficiency during construction, requiring the assistance of large machinery. The steel wire rope binding structure for demolishing concrete box girder segments of old bridges provided in this invention employs a web-lifting method. Steel wire ropes 40 are threaded through holes to lift the web of the girder. This ensures that the two transverse steel wire ropes 40 are of equal length, completely securing the girder and preventing slippage of the lifting steel wire ropes 40, clockwise or counterclockwise rotation of the girder along the longitudinal axis, and upward tilting, significantly increasing lifting safety. Simultaneously, the addition of web-lifting holes 30 to the concrete box girder segment 10 increases the number of load-bearing legs of the lifting steel wire ropes 40. The diameter of the lifting steel wire ropes 40 is reduced, allowing the use of commercially available 54mm diameter steel wire ropes. The reduced stiffness and increased flexibility of the steel wire ropes 40, along with their reduced weight, facilitates manual threading. Furthermore, due to the reduced diameter of the steel wire ropes 40, a single steel wire rope 40 can be threaded through two holes for lifting, further reducing the number of sets of lifting holes 30 and allowing for flexible application by construction personnel according to the construction situation.

[0037] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A wire rope binding structure for concrete box girder segments during the demolition of an old bridge, characterized in that: The system includes concrete box girder segments and steel wire ropes. The concrete box girder segments are formed by a top plate, a bottom plate, and two side webs. The two sides of the top plate extend outward to form flanges. Each concrete box girder segment has several sets of hoisting holes arranged at intervals along the longitudinal direction on opposite sides. Each set of hoisting holes includes a top opening on the top plate, an edge opening on the flange, and a side opening on the side web. A hoisting steel wire rope is threaded through each set of hoisting holes. The steel wire rope sequentially passes through the top opening, the edge opening, and the side opening of the corresponding set of hoisting holes. Both ends of the steel wire rope are used to connect to the hook of a hoisting device.

2. The wire rope binding structure for the concrete box girder segment of an old bridge demolition as described in claim 1, characterized in that: The concrete box girder segment has 2-4 sets of hoisting holes arranged at intervals along the longitudinal direction on both sides.

3. The wire rope binding structure for the concrete box girder segment of the old bridge demolition as described in claim 2, characterized in that: The steel wire rope is a single steel wire rope.

4. The wire rope binding structure for the concrete box girder segment of the old bridge demolition as described in claim 3, characterized in that: The single steel wire rope is doubled before passing through the corresponding hoisting hole.

5. A wire rope binding structure for concrete box girder segments during the demolition of an old bridge, characterized in that: The system includes concrete box girder segments and steel wire ropes. The concrete box girder segments are formed by a top plate, a bottom plate, and two side webs. The two sides of the top plate extend outward to form flanges. Each concrete box girder segment has several sets of hoisting holes arranged at intervals along the longitudinal direction of the bridge on opposite sides. Each set of hoisting holes includes a top opening on the top plate and a side opening on the side webs. A hoisting steel wire rope is threaded through each set of hoisting holes. One end of the steel wire rope is used to connect to the hook of a hoisting device, and the other end of the steel wire rope passes through the top opening and the side opening in sequence, wraps around the outer side of the flange, and then connects to the hook of the hoisting device.

6. The wire rope binding structure for the concrete box girder segment of the old bridge demolition as described in claim 5, characterized in that: The concrete box girder segment has 2-4 sets of hoisting holes arranged at intervals along the longitudinal direction on both sides.

7. The wire rope binding structure for the concrete box girder segment of an old bridge demolition as described in claim 6, characterized in that: The steel wire rope is a single steel wire rope.

8. The wire rope binding structure for the concrete box girder segment of an old bridge demolition as described in claim 7, characterized in that: The single steel wire rope is doubled before passing through the corresponding hoisting hole.

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