A quick assembly and disassembly lifting tool for precast beams and slabs

Abstract

This utility model relates to the field of bridge engineering construction technology, and provides a rapid assembly and disassembly lifting tool for precast beams and slabs. It includes a lifting rod with a lifting hole at the top for connecting clamps or wire ropes, and a circular hole at the bottom of the rod containing a connecting pin. The connecting pin rotatably connects to the middle position of the boom, and the boom's cross-section has different shapes on both sides of the connecting pin. One end of the boom's cross-section is a short and thick section A, and the other end is a long and thin section B, with section A weighing more than section B. Limiting grooves are provided on the lifting rod, with several grooves evenly distributed along the length of the rod, and limiting plates are installed within these grooves. This utility model can meet the requirements for rapid assembly and disassembly of precast beams and slabs, reduces manual intervention, lowers the difficulty of operation for construction personnel, improves construction efficiency, reduces the input of manpower and materials, and is economical.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering construction technology, specifically to a quick assembly and disassembly lifting tool for precast beams and slabs. Background Technology

[0002] Currently, precast components are increasingly widely used in road and bridge engineering due to their advantages of convenient construction and high precision, especially in bridge construction, where the use of precast beams and slabs is increasing year by year. However, when hoisting these precast components, it is often difficult to operate them by using wire ropes to support the bottom or by cutting grooves in the top surface of the beam or slab, inserting wire ropes into the grooves, and then fixing the lower end with clamps. This method is not conducive to rapid assembly and disassembly.

[0003] The current construction method has the following disadvantages: it is difficult to operate, and operators cannot disassemble or assemble the lifting equipment on the top surface of the beam and slab; when using wire rope bottom lifting, the compression of the wire rope may damage the main structure of the precast components.

[0004] Therefore, in order to address the above problems, a quick assembly and disassembly lifting tool for precast beams and slabs is proposed. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by developing a rapid assembly and disassembly lifting device for precast beams and slabs. This invention enables the rapid assembly and disassembly of precast beams and slabs, reduces manual intervention, lowers the difficulty of operation for construction personnel, improves construction efficiency, reduces the input of manpower and materials, and is economical.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] A quick-assembly and disassembly lifting device for precast beams and slabs includes a lifting rod with a lifting hole at the top for connecting clamps or wire ropes, and a circular hole at the bottom of the lifting rod with a connecting pin inside. The connecting pin is rotatably connected to the middle position of the boom, and the cross-section of the boom has different shapes on both sides of the connecting pin. One end of the boom's cross-section is a short and thick section A, and the other end is a long and thin section B, with the weight of section A being greater than that of section B. Limiting grooves are provided on the lifting rod, with several limiting grooves evenly arranged along the length of the lifting rod, and limiting plates are placed in the limiting grooves.

[0008] Preferably, the lifting hole is located at the center of the top of the boom to ensure that the boom is balanced by the tension of the lifting equipment; the round hole is located at the center of the bottom of the boom.

[0009] Preferably, a scale is provided on the boom along its length, with a zero mark at the bottom of the scale. The position of the zero mark on the boom is the position on the boom corresponding to the end point of segment A when the boom segment A coincides with the boom.

[0010] Preferably, a rotating counterweight is provided on one side of section A of the boom. The weight of the rotating counterweight ensures that when section A of the boom is located on the upper side of the connecting pin, there is always a deflection torque that rotates towards the side where the rotating counterweight is installed.

[0011] Preferably, the bottom of the boom is set as an inverted U-shape, and the boom is located inside the inverted U-shape. The length of the inner side of the inverted U-shape at the bottom of the boom is greater than the length of section B of the boom, so that the boom can rotate freely inside the inverted U-shaped boom.

[0012] Preferably, two booms are rotatably mounted on the connecting pin, and rotating counterweights are set on different sides of section A of the two booms. The two booms rotate in opposite directions under the action of gravity, and the lengths of sections A and B of the two booms are the same.

[0013] Preferably, an anti-slip and wear-resistant layer is provided on the side of the boom away from the rotating counterweight, that is, the side of the boom that contacts the bottom of the precast beam.

[0014] The effects provided in the utility model description are merely those of the embodiments, and not all the effects of the utility model. The above technical solution has the following advantages:

[0015] 1. This utility model, by setting up a boom and a jib, with one end of the boom being short and heavy and the other end being long and light, relies entirely on gravity to achieve the rotation of the boom, the engagement with the precast beam, and the separation from the precast beam. It has a simple structure, is convenient to use, has high efficiency, and is economical.

[0016] 2. The boom is equipped with a graduated scale and multiple limit slots. The limit plates are set in different limit slots to meet the hoisting needs of precast beams and slabs of different thicknesses, which is practical. In addition, the limit plates can prevent the boom section B from automatically rotating to the upward position and level with the boom due to excessive lowering or loose wire rope during installation and use, which would cause the hoisting equipment to slip off, thus improving the safety of use. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] Figure 1 This is a schematic diagram of the main structure of the lifting device according to an embodiment of the present utility model;

[0019] Figure 2 This is a side view of the lifting device according to an embodiment of the present utility model;

[0020] Figure 3 This is a structural schematic diagram of the lifting device in the lifting state according to an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the use of the lifting device according to an embodiment of the present utility model. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the use of the lifting device according to an embodiment of the present utility model. Figure 2 ;

[0023] Figure 6 This is a schematic diagram of the use of the lifting device according to an embodiment of the present utility model. Figure 3 ;

[0024] Figure 7 This is a schematic diagram of the use of the lifting device according to an embodiment of the present utility model. Figure 4 ;

[0025] Figure 8 This is a schematic diagram of the use of the lifting device according to an embodiment of the present utility model. Figure 5 .

[0026] In the diagram, 1 is the boom; 2 is the scale; 3 is the limit plate; 4 is the rotating counterweight; 5 is the boom; and 6 is the connecting pin. Detailed Implementation

[0027] 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.

[0028] like Figures 1-3 As shown, a quick-assembly and disassembly lifting device for precast beams includes a lifting rod 1. A lifting hole is provided at the top of the lifting rod 1 for connecting clamps or wire ropes to facilitate lifting by lifting equipment. A circular hole is provided at the bottom of the lifting rod 1, and a connecting pin 6 is installed inside the circular hole. The middle position of a boom 5 is rotatably connected to the connecting pin 6. The cross-section of the boom 5 has different shapes on both sides of the connecting pin 6, forming an asymmetrical structure. One end of the boom 5 has a short and thick section A, and the other end has a long and thin section B. The weight of section A is greater than the weight of section B, allowing section A to naturally rotate to the lower side by gravity around the connecting pin 6 when no external force is applied. A limiting groove is provided on the lifting rod 1, with several limiting grooves evenly arranged along the length of the lifting rod 1. A limiting plate 3 is installed in the limiting groove to prevent the lifting device from falling off the precast beam during use.

[0029] In an optional embodiment, the distance between two adjacent limiting grooves is less than the absolute value of the difference between the length of segment A of boom 5 and the length of segment B of boom 5; preferably, the limiting groove is set in the middle of boom 1 and is set as a circular slot. Compared with opening the limiting groove on the side of boom 1, it can avoid affecting the overall strength of boom 1, so as to avoid stress concentration during boom 1 hoisting and improve safety.

[0030] In one optional embodiment, the lifting hole is located at the center of the top of the boom 1 to ensure the balance of forces when the boom 1 is subjected to the tension of the lifting equipment; the circular hole is located at the center of the bottom of the boom 1 to avoid instability during lifting.

[0031] In an optional embodiment, a scale 2 is provided on the boom 1 along its length, and a zero scale line is provided at the bottom of the scale 2. The position of the zero scale line on the boom 1 is the position on the boom 1 corresponding to the end point of segment A when the boom 5 coincides with the boom 1, so as to facilitate the selection of the installation position of the limiting plate 3 according to the thickness of the precast beam slab.

[0032] In an optional embodiment, a rotating counterweight 4 is provided on one side of section A of the boom 5. The weight of the rotating counterweight 4 ensures that when section A of the boom 5 is located on the upper side of the connecting pin 6, there is always a deflection torque that rotates towards the mounting side of the rotating counterweight 4, so as to avoid the situation where section A of the boom 5 cannot rotate freely, reduce the labor intensity of the workers, and improve the efficiency of construction.

[0033] In an optional embodiment, the bottom of the boom 1 is set as an inverted U-shape, and the boom 5 is located inside the inverted U-shape. The length of the inner side of the inverted U-shape at the bottom of the boom 1 is greater than the length of section B of the boom 5. The boom 5 can rotate freely inside the inverted U-shape of the boom 1, which makes it convenient to remove the lifting equipment from the precast beam after use.

[0034] In an optional embodiment, two booms 5 are rotatably mounted on the connecting pin 6, and rotating counterweights 4 are mounted on different sides of section A of the two booms 5, so that the two booms 5 rotate in opposite directions under the action of gravity. The lengths of sections A and B of the two booms 5 are the same, so as to improve the stability during hoisting and avoid excessive force on one side of the boom 5, which would affect its service life.

[0035] In an optional embodiment, an anti-slip and wear-resistant layer is provided on the side of the boom 5 away from the rotating counterweight 4, that is, the side of the boom 5 that contacts the bottom of the precast beam slab. The anti-slip and wear-resistant layer is made of a metal-based coating applied to the boom 5 to enhance the friction coefficient and hardness of the surface of the boom 5, thereby achieving the effect of anti-slip and wear resistance, avoiding rapid damage to the boom 5, extending its service life, and improving economic efficiency.

[0036] like Figures 4-8As shown, a method for quickly assembling and disassembling precast beams and slabs, using the aforementioned quick assembly and disassembly lifting equipment, includes the following steps:

[0037] Step 1: First, during the prefabrication process of precast beams and slabs, pre-reserve slots and lifting points on the beams and slabs, or open holes at the lifting positions of the finished precast beams and slabs to facilitate the passage of lifting equipment;

[0038] Step 2: Determine the thickness of the precast beam slab as the basis for the installation position of the limiting plate 3. Specifically, according to the scale value of the scale 2 on the hanger 1, install the limiting plate 3 in the limiting groove between the scale value corresponding to the thickness of the precast beam slab and the scale value plus s. The value of s is the absolute value of the difference between the A section and the B section of the boom 5. That is, the position of the limiting groove where the limiting plate 3 is installed satisfies the condition that when the limiting plate 3 contacts the upper surface of the precast beam slab, the boom 5 can rotate and the A section of the boom 5 cannot contact the lower surface of the precast beam slab, while the B section of the boom 5 can contact the lower surface of the precast beam slab.

[0039] Step 3: Rotate section A of boom 5 to the upper side and align it with lifting rod 1. Then, insert the lifting device downwards into the pre-reserved slot in the precast beam slab and through the slot, ensuring that the limiting plate 3 contacts the upper surface of the precast beam slab. Figure 4 As shown;

[0040] Step 4: After section A of the boom 5 is released from the constraint of the reserved slot, due to the overturning torque generated by the rotating counterweight 4, the boom 5 rotates around the connecting pin 6 until section B of the boom 5 is stuck on the bottom surface of the precast beam slab. Figure 5 As shown;

[0041] Step 5: Using lifting equipment, such as a crane, lift the lifting device upwards. At this time, the boom 5 rotates in the opposite direction around the connecting pin 6 until the side of the boom 5 is in contact with the bottom surface of the precast beam slab to facilitate the lifting operation. Figure 6 As shown;

[0042] Step Six: After hoisting is completed, remove the limiting plate 3 from the limiting groove and move the lifting device downwards. At this time, section A of the boom 5 continues to rotate around the connecting pin 6 under the action of gravity. Figure 7 As shown;

[0043] Step 7: Rotate section A of boom 5 to its lowest point, so that section B of boom 5 coincides with lifting rod 1. Then lift the lifting device upwards, allowing it to disengage from the pre-drilled slot in the precast beam slab. Figure 8 As shown.

[0044] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more unless otherwise explicitly specified.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A quick-assembly and disassembly lifting device for precast beams and slabs, comprising a lifting rod (1), characterized in that, A hoisting hole is opened at the top of the hoisting rod (1), and a round hole is opened at the bottom of the hoisting rod (1). A connecting pin (6) is set in the round hole. The boom (5) is rotatably connected to the connecting pin (6). The cross-section of the boom (5) is different on both sides of the connecting pin (6). One end of the cross-section of the boom (5) is a short and thick section A, and the other end is a long and thin section B. The weight of section A is greater than the weight of section B. A limiting groove is opened on the hoisting rod (1). Several limiting grooves are evenly arranged along the length of the hoisting rod (1). The limiting plate (3) is set in the limiting groove.

2. The quick assembly and disassembly lifting device for precast beam slab according to claim 1, characterized in that: The lifting hole is located at the center of the top of the lifting rod (1) to ensure that the lifting rod (1) is balanced by the tension of the lifting equipment; the round hole is located at the center of the bottom of the lifting rod (1).

3. The quick assembly and disassembly lifting device for precast beam slab according to claim 2, characterized in that: A scale (2) is set on the boom (1) along its length. A zero scale line is set at the bottom of the scale (2). The position of the zero scale line on the boom (1) is the position on the boom (1) corresponding to the end point of the boom (5) when the boom (5) coincides with the boom (1).

4. The quick assembly and disassembly lifting device for precast beam slab according to claim 3, characterized in that: A rotating counterweight (4) is installed on one side of section A of the boom (5). The weight of the rotating counterweight (4) ensures that when section A of the boom (5) is located on the upper side of the connecting pin (6), there is always a deflection torque that rotates towards the mounting side of the rotating counterweight (4).

5. The quick assembly and disassembly lifting device for precast beam slab according to claim 1, characterized in that: The bottom of the boom (1) is set as an inverted U-shape, and the boom (5) is located inside the inverted U-shape. The length of the inner side of the inverted U-shape at the bottom of the boom (1) is greater than the length of section B of the boom (5). The boom (5) can rotate freely inside the inverted U-shaped boom (1).

6. The quick assembly and disassembly lifting device for precast beam slab according to claim 4, characterized in that: Two booms (5) are rotatably mounted on the connecting pin (6), and rotating counterweights (4) are mounted on different sides of section A on the two booms (5). The two booms (5) rotate in opposite directions under the action of gravity. The lengths of sections A and B of the two booms (5) are the same.

7. The quick assembly and disassembly lifting device for precast beam slab according to claim 6, characterized in that: An anti-slip and wear-resistant layer is provided on the side of the boom (5) away from the rotating counterweight (4).

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