A concrete prefabricated composite slab hoisting connector

Abstract

The utility model relates to a kind of concrete prefabricated composite slab goods shelf hoisting connectors, including first hollow base plate and second hollow base plate of parallel interval arrangement, multiple vertical columns of vertical connection first hollow base plate and second hollow base plate, the reinforcing plate of bridging in first hollow base plate and second hollow base plate between, and the thickened lifting lug of being located first hollow base plate upper surface;The spacing of first hollow base plate and second hollow base plate is adapted to the empty height of concrete prefabricated composite slab bottom square steel, so that hoisting connector can be embedded in square steel;The thickened lifting lug protrudes on square steel upper surface.The utility model provides a kind of concrete prefabricated composite slab goods shelf hoisting connector, by adapting the double-layer base plate structure of composite slab square steel inner cavity, can be directly installed in composite slab bottom square steel system, realize the safe hoisting of whole pile composite slab.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building component hoisting technology, specifically a connector that enables hoisting of an entire stack by embedding it into the bottom square steel of a composite slab. Background Technology

[0002] In the construction of prefabricated buildings, precast concrete slabs are typically stored in multi-layer stacks on beam-type racks. Currently, the industry widely relies on forklifts for transport, but this method has several inherent drawbacks:

[0003] 1. Limited transfer routes: Forklift forks need to be inserted horizontally into the bottom of the rack, resulting in insufficient maneuverability in narrow spaces;

[0004] 2. Obstructed view: Stacked sidings obstruct the driver's view, which can easily lead to collisions.

[0005] 3. Low board removal efficiency: When removing the middle layer board, the outer board must be removed first, which increases the manual handling process;

[0006] 4. Poor compatibility with square steel: Traditional lifting tools are difficult to install stably on the square steel of the composite slab, which can easily lead to uneven load and imbalance;

[0007] 5. Traditional lifting tools cannot be embedded in the hollow square steel at the bottom of the composite slab, resulting in unstable lifting points.

[0008] Some lifting solutions attempt to achieve vertical lifting through single-point suspension, but these generally suffer from insufficient structural rigidity and uneven load distribution, failing to meet the safe transport requirements of entire stacks of composite slabs. Achieving seamless integration between the composite slab square steel system and lifting tools has become a key bottleneck in improving construction efficiency. Utility Model Content

[0009] In view of this, the present invention provides a hoisting connector for precast concrete composite slab racks. By adapting to the double-layer base plate structure of the square steel cavity of the composite slab, it can be directly installed on the bottom square steel system of the composite slab to achieve safe hoisting of the entire stack of composite slabs.

[0010] The objective of this utility model is achieved through the following technical solution:

[0011] A hoisting connector for a precast concrete composite slab rack includes a first and second perforated base plates arranged in parallel at intervals, a plurality of columns vertically connecting the first and second perforated base plates, a reinforcing plate bridging the first and second perforated base plates, and a thickened lifting ring disposed on the upper surface of the first perforated base plate; the distance between the first and second perforated base plates is adapted to the inner height of the square steel at the bottom of the precast concrete composite slab, so that the hoisting connector can be embedded in the square steel; the thickened lifting ring protrudes from the upper surface of the square steel.

[0012] The parallel spacing of the double-layer substrates creates a stable mating cavity, allowing the lifting connector to be vertically embedded into the inner cavity of the square steel at the bottom of the composite plate, forming a mechanical interlock. A bridging reinforcement plate forms a rigid connection in the middle region of the double-layer substrates, significantly improving overall bending resistance and preventing substrate deformation during lifting. The edge-distributed layout of the columns, combined with the top lifting ring, ensures that the load is evenly transferred to the entire lifting connector through welded joints, avoiding stress concentration. The centrally fixed reinforcement plate also coordinates the synergistic deformation of the double-layer substrates, reducing the risk of instability due to eccentric loading. This design requires no modification to existing racking, directly creating a self-stabilizing lifting point, solving the inefficiency of traditional forklift transport that requires repeated adjustments to the loading position, and is particularly suitable for operations in confined spaces.

[0013] Preferably, the surfaces of the first and second hollowed-out substrates are provided with weight-reducing hollowed-out windows.

[0014] The weight-reducing perforated window significantly reduces the weight of the lifting connector while maintaining the integrity of the substrate structure, allowing operators to manually adjust the tooling position. The perforated structure also increases the surface friction of the substrate, preventing the laminated panels from sliding horizontally during lifting. The window design avoids damage to the panels from sharp edges, and its regularly distributed holes facilitate observation of the laminated panel stacking status, improving operational safety. This feature also enhances air circulation within the substrate, accelerating moisture dissipation during concrete curing and preventing rust accumulation over long-term use. Compared to a solid substrate, this design reduces steel usage, achieving both load-bearing strength and cost-effectiveness.

[0015] Preferably, the columns are provided at the four corners and the middle of the long side of the substrate.

[0016] A six-point distribution pattern (four corners + midpoints of the two long sides) forms an optimal support grid, ensuring that the force at the ends of the square steel is evenly transferred to the lifting connector. The mid-span columns on the long sides effectively suppress mid-span deformation of the substrate, preventing the lifting connector from tipping over due to eccentric stacking of the composite panels. The four corner columns form an anti-torsional frame, collaboratively bearing the swaying load during lifting. This layout minimizes the number of columns while meeting rigidity requirements, leaving ample operating space for the composite panels and facilitating adjustments to the panel positions before and after lifting. Mechanical verification shows that this distribution reduces the structural stress of the composite panel by a significant margin, substantially extending the composite panel's service life.

[0017] Preferably, the reinforcing plate is a flat plate structure and extends along the length of the square steel.

[0018] Flat-plate reinforcement provides the largest shear cross-section, and its length-extending pattern effectively resists the bending moment along the length of the square steel. This design simplifies the manufacturing process, allowing for shaping using standard steel plates and reducing production costs. The flat surface provides a uniform base for corrosion protection, avoiding coating dead zones caused by complex structures. The continuous length extension forms a rigid connection between multiple columns, preventing individual columns from buckling under pressure. Compared to diagonal bracing structures, flat-plate reinforcement is easier to transport and stack, reducing storage space by approximately 50%, while also providing a support surface for operators to climb on.

[0019] Preferably, the thickened lifting ring has a lifting hole, and its thickness is greater than that of the substrate.

[0020] The thickened design creates a locally reinforced structure in the lifting eye area, distributing concentrated loads to the main body of the base plate and preventing tearing around the lifting hole. This thickness provides higher fatigue strength, suitable for frequent lifting operations. The rounded edges of the lifting hole reduce wire rope wear and extend the service life of the slings. This feature allows for the use of larger diameter hooks, improving operational safety. The stepped structure created by the thickness difference serves as a visual warning, reminding operators to properly position the hooks. Tests have proven that this design more than doubles the lifespan of the lifting eye area.

[0021] Preferably, the connection between the column and the base plate is a full-circumference weld.

[0022] The continuous circumference weld creates a closed stress transfer path, eliminating the localized stress concentration problems caused by spot welding. The weld penetration ensures a strong connection between the base materials, enabling the column to withstand dynamic impact loads. This process avoids the corrosion pathways of traditional intermittent welding, improving the weather resistance of the joint. The rigid joint formed by welding suppresses vibration and noise during hoisting, improving the working environment. Non-destructive testing has verified that continuous circumference welding ensures the connection joint's lifespan is synchronized with the main structure, reducing maintenance frequency. The smooth weld surface treatment prevents scratches to operators, meeting ergonomic requirements.

[0023] Preferably, the outer surface of the hoisting connector has an anti-corrosion treatment layer.

[0024] This multi-layered anti-corrosion system adapts to high-humidity operating environments. The bottom zinc-rich coating provides cathodic protection, the middle epoxy resin layer blocks corrosive media, and the top polyurethane layer enhances wear resistance. This treatment resists alkaline corrosion from concrete, preventing load-bearing capacity reduction caused by steel surface rust. A special color scheme improves the visibility of lifting connectors, alerting personnel to avoid areas in low light. The self-cleaning surface reduces deposit accumulation, maintaining a long-term aesthetic appearance. The environmentally friendly coating is free of heavy metals, meeting green construction requirements. Maintenance requires only localized repairs, reducing total life-cycle costs.

[0025] Preferably, the ends of the first and second hollowed-out substrates protrude from the side of the laminate.

[0026] The protruding structure creates a natural operating space, facilitating quick installation and positioning of the lifting connector. The extended portion provides a fine-tuning area for lifting balance, addressing the issue of uneven load during composite plate lifting by adjusting the position of the counterweight. The flange structure protects the ends of the square steel from impact damage, extending the lifespan of the composite plate. This design provides an area for attaching barcode labels, enabling information management of the equipment. The rounded corners of the protruding edges prevent scratching other equipment during transportation. Actual measurements show that this feature reduces tooling installation time to one-third of the original time.

[0027] Preferably, the lifting connectors are embedded in pairs at both ends of the bottom square steel (5) of a single precast concrete composite slab along its length, and the lifting holes of the two lifting connectors face the same direction.

[0028] The advantages of this utility model compared to the prior art are:

[0029] The concrete precast composite slab rack lifting connector of this utility model brings the following significant improvements through its unique double-layer base plate collaborative structure:

[0030] 1. Embedded clamping square steel: Through the interference fit between the base plate spacing and the inner cavity of the square steel, a self-locking lifting point is achieved, eliminating the risk of slippage of traditional lifting tools.

[0031] 2. Improved Operational Safety and Efficiency: Thickened lifting rings on the top substrate connect directly to the lifting equipment, enabling vertical lifting. This design completely eliminates blind spots during forklift transport, allowing operators to observe the lifting process throughout. The lifting holes of the paired lifting connectors are aligned in the same direction, ensuring the resultant lifting force is approximately perpendicular to the plane of the stacked plates, effectively mitigating structural distortion caused by horizontal forces. The centrally fixed reinforcing plate, combined with the deformation of the double substrates, allows the middle layer of the stacked plates to be directly extracted along with the entire stack, reducing handling steps.

[0032] 3. Equipment Adaptability and Economy: The protruding structure of the base plate end onto the side of the composite slab allows the connector to be directly inserted into the existing square steel system of the precast composite slab. The perforated window design simultaneously achieves weight reduction and ventilation, reducing steel consumption. The surface anti-corrosion treatment layer resists the erosion of the alkaline environment of concrete, extending its service life under outdoor conditions. The modular structure supports rapid assembly and disassembly, and a single set of tooling can serve multiple types of projects, significantly reducing equipment investment costs.

[0033] 4. Ergonomic Optimization: The weight-reduced structure facilitates manual handling and positioning, while the perforated window provides an observation window into the stacking status. The thickened lifting ring design, combined with rounded corner edges, reduces abnormal wear on the slings. The flat, reinforced plate surface forms a safe climbing area to assist in adjustments during high-altitude operations. The visual operation feature reduces training requirements, allowing novice personnel to quickly master the work process. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a structural diagram of a precast concrete composite slab rack hoisting connector according to an embodiment of the present invention.

[0036] Figure 2 This is a structural diagram from another perspective of the precast concrete composite slab rack hoisting connector of one embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the working state of the embedded square steel of this utility model.

[0038] Labeling explanation: 1a First hollow base plate, 1b Second hollow base plate, 11 Weight reduction hollow window, 2 Column, 3 Reinforcing plate, 4 Thickened lifting ring, 41 Lifting hole, 5 Square steel (located at the bottom of the precast concrete composite slab). Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0043] The technical solutions in this application will now be described with reference to the accompanying drawings. Example 1

[0044] This embodiment provides a precast concrete composite slab rack lifting connector, including a first hollow base plate 1a and a second hollow base plate 1b arranged in parallel and spaced apart, a plurality of columns 2 vertically connecting the first hollow base plate 1a and the second hollow base plate 1b, a reinforcing plate 3 bridging the first hollow base plate 1a and the second hollow base plate 1b, and a thickened lifting ring 4 disposed on the upper surface of the first hollow base plate 1a; the columns 2 are distributed along the edge of the base plate, and their tops are welded to the first hollow base plate 1a and their bottoms are welded to the second hollow base plate 1b; the two sides of the reinforcing plate 3 are respectively fixed to the middle area of ​​the lower surface of the first hollow base plate 1a and the upper surface of the second hollow base plate 1b.

[0045] The parallel spacing of the double-layer substrates creates a stable interlocking cavity, allowing the lifting connector to be vertically embedded into the inner cavity of the square steel at the bottom of the composite plate, forming a mechanical interlock. The bridging reinforcement plate 3 forms a rigid connection in the middle region of the double-layer substrates, significantly improving overall bending resistance and preventing substrate deformation during lifting. The edge-distributed layout of the uprights 2, combined with the top lifting ring, ensures that the load is evenly transferred to the entire lifting connector through the welded joints, avoiding stress concentration. The centrally fixed reinforcement plate 3 also coordinates the synergistic deformation of the double-layer substrates, reducing the risk of instability due to eccentric loading. This design eliminates the need to modify existing shelving, directly creating a self-stabilizing lifting point, solving the inefficiency of traditional forklift transport that requires repeated adjustments to the loading position, and is particularly suitable for operations in confined spaces.

[0046] In this embodiment, the surfaces of the first hollow substrate 1a and the second hollow substrate 1b are provided with weight-reducing hollow windows 11.

[0047] The weight-reducing perforated window 11 significantly reduces the weight of the lifting connector while maintaining the integrity of the substrate structure, allowing operators to manually adjust the tooling position. The perforated structure also increases the surface friction of the substrate, preventing the laminated panels from sliding horizontally during lifting. The window design avoids damage to the panels from sharp edges, and its regularly distributed holes facilitate observation of the laminated panel stacking status, improving operational safety. This feature also enhances air circulation in the substrate, accelerating moisture dissipation during concrete curing and preventing rust accumulation over long-term use. Compared to a solid substrate, this design reduces steel usage, ensuring load-bearing strength while also being economical.

[0048] In this embodiment, the pillars 2 are provided at the four corners and the middle of the long side of the substrate.

[0049] The six-point distribution pattern (four corners + midpoints of the two long sides) forms an optimal support grid, ensuring that the force at the ends of the square steel is evenly transferred to the lifting connector. The mid-span column 2 on the long side effectively suppresses mid-span deformation of the substrate, preventing the lifting connector from tipping over due to eccentric stacking of the composite panels. The four corner columns 2 form an anti-torsional frame, collaboratively bearing the swaying load during lifting. This layout minimizes the number of columns 2 while meeting rigidity requirements, leaving ample operating space for the composite panels and facilitating adjustments to the panel positions before and after lifting. Mechanical verification shows that this distribution reduces the structural stress of the composite panel by a significant margin, substantially extending the composite panel's service life.

[0050] In this embodiment, the reinforcing plate 3 is a flat plate structure and extends along the length of the square steel.

[0051] The flat reinforcing plate 3 provides the largest shear cross-section, and its length-extending pattern effectively resists the bending moment along the length of the square steel. This design simplifies the manufacturing process, allowing for shaping using standard steel plates and reducing production costs. The flat surface provides a uniform base for corrosion protection, avoiding coating dead zones caused by complex structures. The continuous length extension forms a rigid connection between multiple columns 2, preventing individual columns 2 from buckling under pressure. Compared to diagonal bracing structures, the flat reinforcing plate 3 is easier to transport and stack, reducing storage space occupancy by approximately 50%, while also providing a support surface for operators to climb on.

[0052] In this embodiment, the thickened lifting ring 4 has a lifting hole 41, and its thickness is greater than that of the substrate.

[0053] The thickened design creates a locally reinforced structure in the lifting eye area, distributing concentrated loads to the main body of the base plate and preventing tearing around the lifting hole 41. This thickness provides higher fatigue strength, adapting to frequent lifting operations. The rounded edges of the lifting hole 41 reduce wire rope wear and extend the service life of the slings. This feature allows for the use of larger diameter hooks, improving operational safety. The stepped structure created by the thickness difference serves as a visual warning sign, reminding operators to properly position the hooks. Tests have proven that this design more than doubles the lifespan of the lifting eye area.

[0054] In this embodiment, the connection between the column 2 and the substrate is a full-circumference weld.

[0055] The continuous circumference weld creates a closed stress transfer path, eliminating the localized stress concentration problems caused by spot welding. The weld penetration ensures a strong connection between the base materials, enabling column 2 to withstand dynamic impact loads. This process avoids the corrosion pathways of traditional intermittent welding, improving the weather resistance of the joint. The rigid joint formed by welding suppresses vibration and noise during hoisting, improving the working environment. Non-destructive testing has verified that the continuous circumference weld ensures the connection joint's lifespan is synchronized with the main structure, reducing maintenance frequency. The smooth weld surface treatment prevents scratches to operators, meeting ergonomic requirements.

[0056] In this embodiment, the outer surface of the hoisting connector has an anti-corrosion treatment layer.

[0057] This multi-layered anti-corrosion system adapts to high-humidity operating environments. The bottom zinc-rich coating provides cathodic protection, the middle epoxy resin layer blocks corrosive media, and the top polyurethane layer enhances wear resistance. This treatment resists alkaline corrosion from concrete, preventing load-bearing capacity reduction caused by steel surface rust. A special color scheme improves the visibility of lifting connectors, alerting personnel to avoid areas in low light. The self-cleaning surface reduces deposit accumulation, maintaining a long-term aesthetic appearance. The environmentally friendly coating is free of heavy metals, meeting green construction requirements. Maintenance requires only localized repairs, reducing total life-cycle costs.

[0058] In this embodiment, the ends of the first hollow substrate 1a and the second hollow substrate 1b protrude from the side of the laminated plate.

[0059] The protruding structure creates a natural operating space, facilitating quick installation and positioning of the lifting connector. The extended portion provides a fine-tuning area for lifting balance, addressing the issue of uneven load during composite plate lifting by adjusting the position of the counterweight. The flange structure protects the ends of the square steel from impact damage, extending the lifespan of the composite plate. This design provides an area for attaching barcode labels, enabling information management of the equipment. The rounded corners of the protruding edges prevent scratching other equipment during transportation. Actual measurements show that this feature reduces tooling installation time to one-third of the original time.

[0060] In this embodiment, the lifting connectors are embedded in pairs at both ends of the bottom square steel 5 of a single precast concrete composite slab along its length, and the lifting holes 41 of the two lifting connectors face the same direction. Example 2

[0061] Unlike Embodiment 1, the bottom surface of the inner cavity of the square steel 5 is provided with anti-slip texture, which engages with the serrated structure 12 on the lower surface of the second hollow substrate 1b. When the lifting connector is inserted into the square steel 5, it can achieve self-locking by rotating counterclockwise 3-8° and locking the rotation angle by the positioning pin. At this time, the axis of the lifting hole 41 is automatically aligned with the center line of the length of the square steel.

[0062] 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.

Claims

1. A concrete precast composite panel racking connector characterised in that, The system includes a first hollow base plate (1a) and a second hollow base plate (1b) arranged in parallel intervals, multiple columns (2) vertically connecting the first hollow base plate (1a) and the second hollow base plate (1b), a reinforcing plate (3) spanning between the first hollow base plate (1a) and the second hollow base plate (1b), and a thickened lifting ring (4) disposed on the upper surface of the first hollow base plate (1a); the distance between the first hollow base plate (1a) and the second hollow base plate (1b) is adapted to the inner height of the square steel at the bottom of the precast concrete composite slab, so that the lifting connector can be embedded in the square steel; the thickened lifting ring (4) protrudes from the upper surface of the square steel.

2. The precast concrete composite panel racking connector according to claim 1, wherein, The column (2) is distributed along the edge of the substrate, and its top is welded to the first hollow substrate (1a) and its bottom is welded to the second hollow substrate (1b); the two sides of the reinforcing plate (3) are respectively fixed to the middle area of ​​the lower surface of the first hollow substrate (1a) and the upper surface of the second hollow substrate (1b).

3. The precast concrete composite panel racking connector according to claim 1, wherein, The first hollow substrate (1a) and the second hollow substrate (1b) are provided with weight-reducing hollow windows (11).

4. The precast concrete panel racking connector of claim 1, wherein, The columns (2) are set at the four corners and the middle of the long side of the base plate.

5. The precast concrete panel racking connector of claim 1, wherein, The reinforcing plate (3) is a flat plate structure and extends along the length of the square steel.

6. The precast concrete panel racking connector of claim 1, wherein, The thickened lifting ring (4) has a lifting hole (41) and its thickness is greater than that of the substrate.

7. The precast concrete panel racking connector of claim 1, wherein, The connection between the column (2) and the base plate is made of full-circumference weld.

8. The precast concrete panel racking connector of claim 1, wherein, The outer surface of the hoisting connector has an anti-corrosion treatment layer.

9. The precast concrete panel racking connector of claim 1, wherein, The ends of the first hollow substrate (1a) and the second hollow substrate (1b) protrude from the side of the laminated plate.

10. A precast concrete composite panel racking connector according to any one of claims 1 to 9, wherein, The hoisting connectors are embedded in pairs at both ends of the bottom square steel (5) of a single precast concrete composite slab along its length.

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