Recyclable hanging bar structure for cast-in-situ bored pile reinforcement cage

Abstract

The utility model discloses a recoverable hanging bar structure for a cast-in-situ bored pile reinforcement cage, which belongs to the technical field of pile foundation construction, and comprises more than two hanging rods, a limiting pin and a retraction mechanism, the lower ends of the hanging rods are provided with sleeves matched with the limiting pin, and the sleeves are arranged on the side walls of the hanging rods and can be arranged at the bottom of an annular reinforcement of the reinforcement cage. The limiting pin and the hanging rod can be arranged on the two sides of the circumferential steel bar. A lifting ring matched with the lifting appliance is arranged at the upper end of the lifting rod; the tail end of a traction rope of the retracting mechanism is connected with a limiting pin. In the implementation process, the casing pipe at the lower end of the hanging rod is used for bearing the circumferential steel bars of the steel reinforcement cage, the limiting pin and the hanging rod are used for limiting the circumferential steel bars, and after concrete is poured, the retracting and releasing mechanism is used for retracting the traction rope to pull out the limiting pin; before initial setting of concrete, the suspenders are rotated to be separated from the circumferential steel bars, and the suspenders can be pulled out and cleaned for later use. The device is simple in structure, convenient to operate and capable of being recycled, frequent manufacturing is not needed, material waste is reduced, and the construction cost is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of pile foundation construction technology, and specifically relates to a recyclable lifting bar structure for the steel cage of bored cast-in-place piles. Background Technology

[0002] When lowering the reinforcing cage for bored piles, lifting bars are used to suspend the cage and assist in its vertical positioning, ensuring it remains vertical and does not tilt or deviate during lowering. When the cage reaches near the design depth, the lifting bars are used again for fine-tuning the elevation of the top of the cage to ensure it reaches the predetermined position. Currently, in existing construction processes, the lifting bars are welded and fixed to the reinforcing cage. After the cage is in place and concrete is poured, the lifting bars, which are integrally fixed to the cage, cannot be removed and remain embedded in the concrete. Each bored pile requires the re-fabrication of lifting bars, which is not only time-consuming and labor-intensive but also increases construction costs. Utility Model Content

[0003] To address the above problems, this utility model provides a recyclable lifting bar structure for the reinforcing cage of bored cast-in-place piles.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A recyclable lifting bar structure for a bored pile reinforcement cage includes lifting rods, limiting pins, and a retraction mechanism. There are two or more lifting rods, each with a sleeve at its lower end that engages with the limiting pin. The sleeve is located on the side wall of the lifting rod and can be positioned at the bottom of the circumferential reinforcement bars in the reinforcement cage. The limiting pin and the lifting rod can be positioned on either side of the circumferential reinforcement bars. The upper end of the lifting rod has a lifting ring for engaging with a lifting device. The end of the traction rope of the retraction mechanism is connected to the limiting pin, used to pull out the limiting pin during concrete pouring.

[0006] Furthermore, the winding and unwinding mechanism includes a support frame, a reel, and a fixed pulley. The support frame is fixed to the ground around the pile hole. The reel and the fixed pulley are respectively located at the top two ends of the support frame. The traction rope wound on the reel passes around the fixed pulley and is connected to the limiting pin. A crank is provided on the side of the reel for retrieving the traction rope.

[0007] Furthermore, the top of the limiting pin is provided with a hanging ring, and the end of the traction rope is connected to the hanging ring.

[0008] Furthermore, the support frame includes a column, a crossbeam, and reinforcing plates. The lower end of the column is vertically inserted into the soil around the pile hole. One end of the crossbeam is fixed to the top of the column, and the other end extends above the limiting pin. The reel and the fixed pulley are respectively set at both ends of the crossbeam, and the fixed pulley is set above the limiting pin.

[0009] Furthermore, the traction rope is provided with graduations.

[0010] Furthermore, the lifting rod consists of three rods, with a Y-shaped support rod between them. The Y-shaped support rod forms a right angle with the lifting rod, and the end of the Y-shaped support rod is provided with an openable clamp for holding the lifting ring at the upper end of the lifting rod.

[0011] Furthermore, the upper part of the lifting ring is a rectangular frame, and the lower part of the two side frames of the rectangular frame gradually shrinks and is welded and fixed to the outer wall of the lifting rod. Multiple horizontal reinforcing rods are spaced from top to bottom inside the rectangular frame; the clamp at the end of the Y-shaped support rod can hold the reinforcing rods of the same height.

[0012] Furthermore, there are two or more sleeves, used to cooperate with the circumferential reinforcing bars adjacent to the top of the reinforcing cage.

[0013] Furthermore, the exterior of both the limiting pin and the hanger rod is coated with a peelable coating to prevent concrete from setting.

[0014] The technological advancements achieved by this invention compared to existing technologies are as follows:

[0015] This invention utilizes a sleeve at the lower end of a lifting rod to support the circumferential reinforcing bars of the steel cage. Limiting pins and the lifting rod are used to restrict the movement of the circumferential reinforcing bars, ensuring the stability of the steel cage during hoisting. After the steel cage is in place, concrete is poured, and the traction rope is retrieved using a retraction mechanism to pull out the limiting pins. Before the concrete initially sets, the lifting rod is rotated to detach the sleeve from the circumferential reinforcing bars, allowing the lifting rod to be removed, cleaned, and reused. This invention has a simple structure, is easy to operate, and can be recycled, eliminating the need for frequent fabrication, reducing material waste, and significantly lowering construction costs. Attached Figure Description

[0016] 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.

[0017] In the attached diagram:

[0018] Figure 1 A schematic diagram illustrating the application status of a recyclable lifting bar structure for a bored pile reinforcement cage, provided by an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram showing the cooperation between the lifting rod and the limiting pin and the circumferential steel bar in an embodiment of this utility model;

[0020] Figure 3 This is a top view of the Y-shaped support rod in an embodiment of this utility model;

[0021] Figure 4 for Figure 3 Partial schematic diagram of the Y-shaped support rod and clamp fitting;

[0022] Figure 5 This is a schematic diagram of the connection between the lifting rod and the lifting ring in an embodiment of this utility model;

[0023] In the picture:

[0024] 00-Reinforcing cage; 01-Circular reinforcement; 02-Pile hole; 1-Hanging rod; 2-Limit pin; 3-Traction rope; 4-Sleeve; 5-Lifting ring; 6-Support frame; 7-Wind reel; 8-Fixed pulley; 9-Handle; 10-Column; 11-Beam; 12-Reinforcing rib; 13-Y-type support rod; 14-Clamping hoop; 15-Reinforcing rod; 16-Lifting rope. Detailed Implementation

[0025] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0026] like Figure 1 , Figure 2 As shown, a recyclable lifting rod structure for a bored pile reinforcement cage includes a lifting rod 1, a limiting pin 2, and a retraction mechanism. There are two or more lifting rods 1. The lower end of each lifting rod 1 is provided with a sleeve 4 that cooperates with the limiting pin 2. The sleeve 4 is located on the side wall of the lifting rod 1 and can be placed at the bottom of the circumferential reinforcement 01 of the reinforcement cage 00. The limiting pin 2 and the lifting rod 1 can be placed on both sides of the circumferential reinforcement 01. The upper end of the lifting rod 1 is provided with a lifting ring 5 for cooperation with a lifting device. The end of the traction rope 3 of the retraction mechanism is connected to the limiting pin 2, used to pull out the limiting pin 2 during concrete pouring. In specific implementation, the lifting rod and the limiting pin are fixed to the reinforcement cage. The limiting pin and the sleeve are tightly fitted, so the limiting pin will not come out of the sleeve during the lowering of the reinforcement cage. It can be pulled out before the concrete is poured to the position of the limiting pin. Before the concrete initially sets, the lifting rod is rotated to disengage the sleeve from the circumferential reinforcement, allowing the lifting rod to be pulled out. The lifting rod is then cleaned and reused.

[0027] As a preferred structure, such as Figure 1 As shown, the launching and retracting mechanism includes a support frame 6, a reel 7, and a fixed pulley 8. The support frame 6 is fixed to the ground around the pile hole 02. The reel 7 and the fixed pulley 8 are respectively located at the top ends of the support frame 6. The traction rope 3 wound on the reel 7 passes around the fixed pulley 8 and is connected to the limiting pin 2. A crank handle 9 is provided on the side of the reel 7 for retracting the traction rope 3. During the lowering process of the reinforcing cage, the lowering depth of the reinforcing cage is determined by measuring the number of rotations of the reel, thereby determining the elevation of the reinforcing cage to meet the design requirements. Before the concrete is poured to the position of the limiting pin, the reel is rotated in the opposite direction by the crank handle, and the rising traction rope is used to pull out the limiting pin.

[0028] In addition, by setting a scale on the traction rope 3, and using traction ropes that are matched with different booms, it is possible to accurately determine whether the steel cage has tilted during the lowering process, so as to take timely measures to ensure that the steel cage is always in a vertical state.

[0029] In the specific production process, such as Figure 2 As shown, the top of the limiting pin 2 is provided with a hanging ring 20, and the end of the traction rope 3 is connected to the hanging ring 20. Before construction, the end of the traction rope is pre-tied and fixed to the hanging ring, making operation convenient and quick. The limiting pin can be made by bending the upper end of a steel bar.

[0030] In specific embodiments of this utility model, such as Figure 1 As shown, the support frame 6 includes a column 10, a crossbeam 11, and a reinforcing plate 12. The lower end of the column 10 is vertically inserted into the soil around the pile hole 02. One end of the crossbeam 11 is fixed to the top of the column 10, and the other end extends above the limiting pin 2. The reel 7 and the fixed pulley 8 are respectively set at both ends of the crossbeam 11, and the fixed pulley 8 is set above the limiting pin 2. In specific manufacturing, the lower end of the column can be designed as a pointed tip to facilitate insertion into the soil. At the same time, openable and closable support legs are installed on the lower side wall of the column to improve the stability of the column after it is installed. After construction, the column can be pulled out and the support legs can be folded for easy carrying. In addition, the crossbeam and the reinforcing plate can be designed as foldable and retractable movable connection structures. When in use, they can be unfolded and fixed with bolts, and when not in use, they can be folded for storage, which is convenient for operation and transportation.

[0031] Further optimize the above solution, such as Figure 3 , 4 As shown, there are three lifting rods 1, with a Y-shaped support rod 13 between them. The Y-shaped support rod 13 forms a right angle with the lifting rod 1. The end of the Y-shaped support rod 13 is equipped with an openable clamp 14 for holding the lifting ring 5 at the upper end of the lifting rod 1. This structure can limit the movement of the three lifting rods, which improves the stability of the reinforcing cage during hoisting compared to two lifting rods, and can prevent the reinforcing cage from tilting to one side without timely detection and correction.

[0032] In the specific production process, such as Figure 5 As shown, the upper part of the lifting ring 5 is a rectangular frame. The lower parts of the two side frames of the rectangular frame gradually taper back and are welded and fixed to the outer wall of the lifting rod 1. Multiple horizontal reinforcing rods 15 are spaced apart from top to bottom inside the rectangular frame. The clamps 14 at the ends of the Y-shaped support rod 13 can hold the reinforcing rods 15 of equal height. The use of multiple reinforcing rods increases the strength of the lifting rod, allowing it to accommodate steel cages of different weights and expanding its applicability. This structure further improves the stability of the steel cage during hoisting.

[0033] In a specific embodiment of this utility model, two or more sleeves 4 are selected to cooperate with the circumferential reinforcing bars 01 adjacent to the top of the reinforcing cage 00. This structure can improve the supporting force on the reinforcing cage and further improve the stability of the reinforcing cage during hoisting.

[0034] To further optimize the above solution, the exterior of both the limiting pin 2 and the lifting rod 1 is coated with a peelable coating to prevent concrete from setting. The peelable coating can be a release agent, which prevents concrete from adhering to the surfaces of the limiting pin and the lifting rod, reducing resistance during the pull-out process.

[0035] The specific application process of this utility model is as follows: First, apply a release agent to the surface of the limiting pin and the lifting rod. Place the sleeve at the bottom of the circumferential reinforcing bar, and then insert the limiting pin into the sleeve to clamp and fix the circumferential reinforcing bar. Then, use a Y-shaped support rod to clamp the three lifting rods, and tie the lifting rope to the lifting ring. Use hoisting equipment to lift the reinforcing cage and lower it into the pile hole. After the reinforcing cage is in place, begin pouring concrete. Before the concrete reaches the limiting pin, use a crank handle and traction rope to pull the limiting pin out of the sleeve. Continue pouring concrete until the process requirements are met. Before the concrete reaches initial setting, open the clamps, remove the Y-shaped support rod, rotate the lifting rod 180° to pull out the concrete, and clean the lifting rod for later use. Finally, pull out the column, fold and store the support frame for easy transport.

[0036] In summary, this invention has the advantages of simple structure and convenient operation. It utilizes a sleeve on the lifting rod to support the circumferential reinforcing bars of the steel cage, and uses a limiting pin and the lifting rod to limit the circumferential reinforcing bars. After the steel cage is in place, concrete is poured, and the limiting pin is pulled out using a retraction mechanism. The lifting rod is rotated to pull out the pin before the concrete initially sets, and it can be easily recycled after cleaning. This invention eliminates the need for frequent fabrication, reduces material waste, and significantly lowers construction costs.

[0037] 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 scope of protection of the claims of this utility model.

Claims

1. A recyclable lifting bar structure for the reinforcing cage of a bored pile, characterized in that: The device includes a lifting rod, a limiting pin, and a retraction mechanism. There are two or more lifting rods. The lower end of each lifting rod is provided with a sleeve that mates with the limiting pin. The sleeve is located on the side wall of the lifting rod and can be placed at the bottom of the circumferential reinforcing bars of the reinforcing cage. The limiting pin and the lifting rod can be placed on both sides of the circumferential reinforcing bars. The upper end of each lifting rod is provided with a lifting ring for mates with a lifting device. The end of the traction rope of the retraction mechanism is connected to the limiting pin, used to pull out the limiting pin during concrete pouring.

2. The recoverable lifting bar structure for a cast-in-place pile reinforcement cage according to claim 1, characterized in that: The winding and unwinding mechanism includes a support frame, a reel, and a fixed pulley. The support frame is fixed to the ground around the pile hole. The reel and the fixed pulley are respectively located at the top two ends of the support frame. The traction rope wound on the reel passes around the fixed pulley and is connected to the limiting pin. A crank is provided on the side of the reel for retrieving the traction rope.

3. The recoverable lifting bar structure for a cast-in-place pile reinforcement cage according to claim 1, characterized in that: The top of the limiting pin is provided with a hanging ring, and the end of the traction rope is connected to the hanging ring.

4. The recoverable lifting bar structure for a cast-in-place pile reinforcement cage according to claim 2, characterized in that: The support frame includes columns, beams, and reinforcing plates. The lower end of the column is vertically inserted into the soil around the pile hole. One end of the beam is fixed to the top of the column, and the other end extends above the limiting pin. The reel and the fixed pulley are respectively set at both ends of the beam, and the fixed pulley is set above the limiting pin.

5. The recoverable lifting bar structure for a cast-in-place pile reinforcement cage according to claim 2, characterized in that: The traction rope is marked with graduations.

6. The recyclable lifting bar structure for the reinforcing cage of a bored pile according to claim 1, characterized in that: The suspension rod consists of three rods, with a Y-shaped support rod between them. The Y-shaped support rod forms a right angle with the suspension rod, and the end of the Y-shaped support rod is equipped with an openable clamp for holding the lifting ring at the upper end of the suspension rod.

7. The recoverable lifting bar structure for a cast-in-place pile reinforcement cage according to claim 6, characterized in that: The upper part of the lifting ring is a rectangular frame. The lower parts of the two side frames of the rectangular frame gradually shrink and are welded and fixed to the outer wall of the lifting rod. Multiple horizontal reinforcing rods are spaced from top to bottom inside the rectangular frame. The clamp at the end of the Y-shaped support rod can hold the reinforcing rods of the same height.

8. The recoverable lifting bar structure for a cast-in-place pile reinforcement cage according to claim 1, characterized in that: The sleeve is in pairs or more, used to cooperate with the circumferential reinforcing bars adjacent to the top of the reinforcing cage.

9. The recoverable lifting bar structure for cast-in-place pile reinforcement cage according to any one of claims 1-8, characterized in that: The limiting pin and the outside of the rod are coated with a peelable coating to prevent the concrete from setting.

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