A reinforced concrete arch bridge arch rib segment hoisting structure

Abstract

The invention provides a reinforced concrete arch bridge arch rib segment hoisting structure, the left and right webs of the arch rib segment are respectively provided with hoisting holes, the arch rib segment is respectively provided with through slots at the left and right ends of its top plate, a steel plate is movably inserted in the through slot, a limit pin is provided at the top of the steel plate, a through hole is provided at the bottom of the steel plate, a steel rod is movably inserted through the hoisting hole, the steel rod passes through the hoisting hole and the through hole in sequence, a limit device is respectively provided at both ends of the steel rod, and a steel sling for hoisting is installed at the position between the web and the limit device at the outer end of the steel rod. The reinforced concrete arch bridge arch rib segment hoisting structure described in the invention has high safety and reliability, does not need to bury a large number of embedded parts on the arch rib segment, is easy to install and remove, and greatly simplifies the construction process.

Description

Technical Field

[0001] The invention belongs to the field of bridge engineering, and in particular relates to a reinforced concrete arch bridge arch rib segment hoisting structure. Background Art

[0002] Since my country is mountainous and has many canyons, arch bridges are widely used in my country. As the design span of arch bridges continues to increase, prefabricated arch rib segments and cable crane lifting construction are often used during construction. However, the lifting of prefabricated arch rib segments of reinforced concrete arch bridges cannot be directly welded to lifting ears like prefabricated steel tube concrete segments, and the lifting is difficult. Traditional reinforced concrete segment lifting generally embeds steel strands in the arch rib segments, and at the same time, a large number of embedded parts are set on the arch rib segments. The tensile force is borne by the pre-tension of the steel strands and the embedded parts, or the arch rib segments are directly tied with steel wire for lifting through certain fixing measures. As the weight of a single-segment arch rib segment gradually increases, the traditional method has the following disadvantages: 1. The embedded parts and steel strands need to withstand a tensile force of more than 100 tons, which requires a certain stability of the embedded parts and steel strand structure. 2. The embedded parts and steel strands will conflict with the steel bars of the arch rib segments, which will affect the stress of the embedded parts and the stability of the pier body. In addition, it is difficult to install and remove them, and they cannot be reused. After the construction is completed, the pier body needs to be repaired, and the construction process is complicated. 3. It is difficult to directly use steel wire ropes to bind and hoist them, and it is difficult to ensure the stability of the hoisting and the accuracy of the adjustment angle. Therefore, for the hoisting of reinforced concrete arch rib segments, it is necessary to propose a hoisting structure with reasonable structural design, simple installation and removal, sustainable use, and no significant impact on the structure of the reinforced concrete arch rib segments. Invention content

[0003] In view of this, the present invention aims to propose a lifting structure for the arch rib segment of a reinforced concrete arch bridge, so as to provide a lifting structure with reasonable structural design, easy installation and dismantling, sustainable use, and no significant impact on the structure of the reinforced concrete arch rib segment.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A reinforced concrete arch bridge arch rib segment lifting structure, the left and right webs of the arch rib segment are respectively provided with lifting holes, and the left web lifting holes correspond to the right web lifting holes one by one, the arch rib segment is respectively provided with through grooves corresponding to the web lifting holes on the same side at the left and right end positions of its top plate, a steel plate is movably inserted in each through groove, and the bottom end of the steel plate is directly opposite to the corresponding lifting hole after passing through the through groove, a limit pin for limiting the downward movement of the steel plate is provided at the top of the steel plate, and a through hole directly opposite to the lifting hole is provided at the bottom end of the steel plate, a steel rod is movably passed through the lifting hole, and the steel rod is sequentially passed through the lifting hole and the through hole, a limit device is respectively provided at both ends of the steel rod, and a steel sling for lifting is passed through the steel rod at a position between the web and the limit device located at the outer end of the steel rod.

[0006] Furthermore, the limiting device includes a sleeve, and threaded portions respectively arranged at two ends of the steel rod, and a limiting nut matching the threaded portion. The sleeve is movably mounted on the steel rod, the limiting nut corresponds to the outer end surface of the sleeve, and the steel sling is arranged between the sleeve and the web.

[0007] Furthermore, a steel pipe is pre-buried in the steel rod lifting hole, and the steel rod is arranged through the steel pipe.

[0008] Furthermore, a limiting pad is provided between the steel plate and its corresponding web, and the steel rod is freely passed through the limiting pad.

[0009] Furthermore, a rubber gasket is provided between the web and the steel sling.

[0010] Furthermore, a gap of 5-10 mm is left between the limiting device and the steel sling, and between the limiting device and the steel plate.

[0011] Furthermore, the number of lifting holes on the left and right webs of the arch rib segment is two each.

[0012] Compared with the prior art, the reinforced concrete arch bridge arch rib segment hoisting structure created by the present invention has the following advantages:

[0013] The invention creates a reinforced concrete arch bridge arch rib segment hoisting structure. Compared with the prior art, the design structure has clear force, high safety and reliability, no need to bury a large number of embedded parts on the arch rib segment, holes are opened at the web position of the arch rib segment and steel pipes are embedded, which has little impact on the arch rib segment structure, and is easy to install and dismantle, greatly simplifies the construction process, and can be used continuously, saving construction costs. It has high economy and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0015] Figure 1 This is a three-dimensional structural diagram of the left and right webs hoisted by a steel hoisting belt respectively during hoisting of this embodiment;

[0016] Figure 2 This is the hoisting front view of this embodiment;

[0017] Figure 3 This is a schematic diagram of the principle of the lifting structure of this embodiment;

[0018] Description of reference numerals:

[0019] 1-arch rib segment; 101-web plate; 102-top plate; 2-steel rod; 3-steel sling; 4-steel plate; 5-limit pin; 6-limit device; 601-limit nut; 602-sleeve; 7-shackle; 8-steel wire rope; 9-overhead crane lower bracket; 10-overhead crane; 11-steel pipe; 12-limit pad; 13-rubber gasket. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] like Figure 3 As shown, a reinforced concrete arch bridge arch rib segment hoisting structure, the arch rib segment 1 is provided with hoisting holes on the webs 101 on the left and right sides thereof, and the left web hoisting holes correspond to the right web hoisting holes one by one. In this embodiment, in order to improve the balance of the arch rib segment during hoisting, this hoisting method adopts four-point hoisting. During hoisting, the arch rib segment 1 is in a horizontal state, that is, its top plate 102 is in a horizontal state, and the number of hoisting holes on the left and right webs 101 of the arch rib segment 1 is two respectively, and finally four-point hoisting is realized, and the four hoisting points are arranged in a square. The arch rib segment 1 is provided with through grooves at the left and right ends of its top plate 102, which correspond to the hoisting holes on the same side webs. In this embodiment, two through slots are respectively arranged at the left and right ends of the top plate 102. The two through slots arranged at each end of the top plate 102 are respectively arranged in one-to-one correspondence with the two lifting holes on the side web 101, that is, to ensure that one lifting hole matches one through slot. In this embodiment, the through slot is a square hole structure arranged through the top plate 102. A steel plate 4 is movably inserted in each through slot. The bottom end of the steel plate 4 matched with the through slot passes downward through the top plate 102 and faces the corresponding lifting hole of the through slot. To ensure easy disassembly and assembly, a gap is left around the steel plate 4 and the through slot. A limiting hole is arranged at the top of the steel plate 4. A limiting pin 5 is interference-fitted in the limiting hole. The limiting pin 5 is horizontal and close to the top surface of the top plate 102. The limiting pin 5 limits the downward movement of the steel plate 4, that is, the steel plate 4 is hoisted on the top plate 102 through the limiting pin 5. The bottom end of the steel plate 4 is provided with a through hole directly opposite to the corresponding lifting hole. A steel rod 2 is movably installed in the lifting hole. In order to improve the force uniformity of the arch rib segment 1 during the lifting process, a steel pipe 11 is pre-buried in the lifting hole. The inner diameter of the steel pipe is 3-5 mm larger than the diameter of the steel rod. Similarly, the diameter of the through hole of the steel plate 4 is 3-5 mm larger than the diameter of the steel rod, thereby ensuring that the steel rod 2 can be smoothly inserted and can rotate freely, which is convenient for adjusting the installation angle of the arch rib segment 1 during the lifting process. The steel rod 2 passes through the steel pipe 11 and the through hole of the steel plate 4 in sequence. A limit device 6 is provided at each end of the steel rod 2. A 5-10 mm space is reserved between the steel plate 4 and its corresponding limit device 6 to ensure that the steel plate is not affected when rotating and no eccentric tension occurs. The steel rod 2 is installed with a lifting steel sling 3 at the position between the web 101 and the limit device 6 located at the outer end of the steel rod 2. That is, the steel rod 2 is axially limited by the limit devices 6 at both ends to prevent the steel rod from falling off. The steel sling 3 is installed on the corresponding steel rod 2 through the installation hole at the bottom, and the steel sling 3 is prevented from falling off by the outer limit device 6. In this embodiment, the diameter of the installation hole of the steel sling 3 is 3 to 5 mm larger than the diameter of the steel rod 2. There is a 5-10 mm gap between the limit device 6 and the steel sling 3, and between the limit device 6 and the steel plate 4, respectively, to ensure that the steel rod 2, the steel sling 3, and the steel plate 4 can all rotate freely. During lifting, if Figure 1 , 2As shown, each of the four steel slings 3 matches a crane 10, and each steel sling 3 is hung on the crane lower bracket 9 of the corresponding crane 10 through a steel wire rope 8. For easy disassembly and assembly, the steel sling 3 and the steel wire rope 8 are connected by a shackle 7. Thus, the four-point balanced lifting is completed, and the four cranes 10 are driven at the same time, that is, the lifting and transportation of the arch rib segment 1 is completed.

[0025] In this embodiment, the limiting device 6 includes a sleeve 602, and threaded parts respectively arranged at the two ends of the steel rod 2, and a limiting nut 601 matched with the threaded part. The sleeve 602 is movably sleeved on the steel rod 2, and the limiting nut 601 corresponds to the outer end surface of the sleeve 602. The steel sling is arranged between the sleeve 602 and the web 101. By adjusting the position of the limiting nut 601, the axial position of the sleeve 602 is adjusted, that is, the gap between it and the steel sling 3 is adjusted to meet the requirements of different lifting environments.

[0026] In this embodiment, in order to prevent eccentric tension from occurring, a limiting pad 12 is provided between the steel plate 4 and its corresponding web 101. The limiting pad 12 is provided with a through hole for the steel rod 2 to pass through. The diameter of the through hole is 3-5 mm larger than the diameter of the steel rod. The steel rod 2 is freely passed through the through hole of the limiting pad 12.

[0027] In this embodiment, during the hoisting process, in order to prevent hard contact between the steel sling 3 and the arch rib segment 1, a rubber gasket 13 is provided between the web and the steel sling 3.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reinforced concrete arch bridge arch rib segment hoisting structure, characterized in that: The webs (101) on the left and right sides of the arch rib segment (1) are each provided with a lifting hole, and the left web lifting hole corresponds to the right web lifting hole one by one. The arch rib segment (1) is provided with through grooves corresponding to the web lifting holes on the same side at the left and right ends of its top plate (102). A steel plate (4) is movably inserted into each through groove. After the bottom end of the steel plate (4) passes through the through groove, it faces the corresponding lifting hole. A limit pin (5) for limiting the downward movement of the steel plate is provided at the top end of the steel plate (4). A through hole facing the lifting hole is provided at the bottom end of the steel plate (4). A steel rod (2) is movably inserted into the lifting hole. The steel rod (2) passes through the lifting hole and the through hole in sequence. A limit device (6) is provided at each end of the steel rod (2). A steel sling (3) for lifting is provided on the steel rod (2) at a position between the web (101) and the limit device (6) located at the outer end of the steel rod (2). A steel pipe (11) is pre-buried in the steel bar hoisting hole, and the steel bar (2) is arranged through the steel pipe (11); The number of hoisting holes on the left side and the right side web (101) of the arch rib segment (1) is two each.

2. A reinforced concrete arch bridge arch rib segment hoisting structure according to claim 1, characterized in that: The limiting device (6) comprises a sleeve (602), threaded portions respectively arranged at two ends of the steel rod (2), and a limiting nut (601) matching the threaded portion. The sleeve (602) is movably sleeved on the steel rod (2), the limiting nut (601) and the outer end surfaces of the sleeve (602) correspond to each other, and the steel sling is arranged between the sleeve (602) and the web (101).

3. A reinforced concrete arch bridge arch rib segment hoisting structure according to claim 1 or 2, characterized in that: A limiting pad (12) is provided between the steel plate (4) and its corresponding web (101), and the steel rod (2) is freely extended through the limiting pad (12).

4. A reinforced concrete arch bridge arch rib segment hoisting structure according to claim 1 or 2, characterized in that: A rubber gasket (13) is provided between the web (101) and the steel sling (3).

5. A reinforced concrete arch bridge arch rib segment hoisting structure according to claim 1 or 2, characterized in that: A gap of 5-10 mm is respectively left between the limiting device (6) and the steel sling (3), and between the limiting device (6) and the steel plate (4).

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