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

Abstract

The utility model relates to a recyclable cast-in-situ bored pile reinforcement cage hanging bar, which belongs to the technical field of building construction and comprises a hanging ring main bar and a stress main bar, the hanging ring main bar and the stress main bar are adjustably connected through a length adjusting connecting piece, a positioning hole device is arranged at the bottom of the stress main bar, and a positioning hole locking device is arranged between the hanging ring main bar and the stress main bar. The hanging ring main rib is formed by bending a twisted steel, the upper portion is annular, and the lower portion is vertical. And the stressed main reinforcements are twisted reinforcements. The length adjusting connecting piece is a long-strip-shaped annular steel piece, an upper penetrating-connecting hole and a lower penetrating-connecting hole are formed in the upper portion and the lower portion of the length adjusting connecting piece in a butt welding mode, the hanging ring main rib is connected into the upper penetrating-connecting hole in a penetrating mode and fastened through a nut, and the stress main rib is connected into the lower penetrating-connecting hole in a penetrating mode and fastened through a nut. The problems that traditional hanging bar construction is low in efficiency, high in cost, unstable in construction quality, large in environmental burden, large in safety risk and limited in construction flexibility are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and particularly relates to a recyclable suspension bar for the steel cage of a bored cast-in-place pile. Background Art

[0002] In the construction industry, bored cast-in-place piles are a widely used deep foundation construction technology, especially in high-rise buildings, bridges, and large infrastructure projects. The construction process of bored cast-in-place piles includes steps such as mechanical hole formation, placing the steel cage, and pouring concrete. Among them, the hoisting and positioning of the steel cage are key links to ensure the quality of the pile foundation.

[0003] The traditional method of hoisting and positioning the steel cage usually uses temporarily welded suspension bars on-site. This method has the following problems:

[0004] Low construction efficiency: On-site welding of the suspension bars requires manual operation at the hole opening, which is not only time-consuming but also affected by the construction environment and weather conditions, making it difficult to guarantee the construction efficiency.

[0005] High cost: On-site welding of the suspension bars requires a large amount of high-strength steel bars. Each pile needs to be cut after excavation, which is difficult to turnover, and due to rust and different lengths, a large amount of waste is generated, greatly increasing the construction cost.

[0006] Unstable construction quality: Usually, the suspension bars are welded to the anchor bars of the steel cage, which tests the tensile performance of the main bars. It is easy to cause deviations in the shape and size of the steel cage due to improper operation or material quality problems, affecting the bearing capacity and structural stability of the pile foundation.

[0007] Environmental burden: The waste and material waste generated during on-site construction cause a burden on the environment, which is contrary to the current concept of green buildings and sustainable development.

[0008] Safety risks: On-site tying of the suspension bars increases the safety risks in high-altitude operations and complex construction environments, posing a threat to the lives of construction workers.

[0009] Limited construction flexibility: The traditional method of suspension bars is difficult to adapt to different construction conditions and design changes, restricting the construction flexibility and adaptability. Summary of the Utility Model

[0010] The purpose of the utility model is to provide a recyclable suspension bar for the steel cage of a bored cast-in-place pile, and solve the problems of low construction efficiency, high cost, unstable construction quality, large environmental burden, high safety risks, and limited construction flexibility of traditional suspension bars.

[0011] To achieve the above purpose, the utility model adopts the following technical solutions:

[0012] A recyclable suspension bar for the steel reinforcement cage of a bored cast-in-place pile, comprising a lifting ring main reinforcement and a stress-bearing main reinforcement. The length-adjusting connecting piece between the lifting ring main reinforcement and the stress-bearing main reinforcement is adjustably connected. A positioning hole device is provided at the bottom of the stress-bearing main reinforcement, and a positioning hole locking device is provided between the lifting ring main reinforcement and the stress-bearing main reinforcement.

[0013] The lifting ring main reinforcement is formed by bending a threaded steel bar, with the upper part being annular and the lower part being vertical.

[0014] The stress-bearing main reinforcement is a threaded steel bar.

[0015] The length-adjusting connecting piece is a long strip-shaped annular steel piece, with an upper through-hole and a lower through-hole welded to the upper and lower parts respectively. The lifting ring main reinforcement passes through the upper through-hole and is fastened with a nut. The stress-bearing main reinforcement passes through the lower through-hole and is fastened with a nut.

[0016] The positioning hole device includes a section of the first short steel bar welded to the bottom end of the stress-bearing main reinforcement with a tie bar. The lower part of the first short steel bar extends out of the stress-bearing main reinforcement to form an extension part. A second short steel bar is welded to the lower part of the extension part with a tie bar. A gap is left between the second short steel bar and the stress-bearing main reinforcement to form a positioning hole.

[0017] The positioning hole locking device includes a pair of hollow sleeves centered and an L-shaped buckle steel bar passing through between the pair of hollow sleeves; the pair of hollow sleeves are aligned with the positioning hole; the L-shaped buckle steel bar is L-shaped, with the bottom passing through between the pair of hollow sleeves to close the positioning hole, and the top L-shaped part being clamped inside the annular part of the lifting ring main reinforcement.

[0018] A further preferred technical solution: The second short steel bar is centered with the stress-bearing main reinforcement.

[0019] A further preferred technical solution: The diameters of the first short steel bar and the second short steel bar are the same as that of the stress-bearing main reinforcement.

[0020] A further preferred technical solution: The bottom surfaces of the first short steel bar and the second short steel bar are flush.

[0021] A further preferred technical solution: The upper hollow sleeve is fillet welded to the bottom of the stress-bearing main reinforcement, and the bottom surface is flush with the bottom surface of the stress-bearing main reinforcement.

[0022] A further preferred technical solution: The lower hollow sleeve is fillet welded to the second short steel bar, and the top surface is flush with the top surface of the second short steel bar.

[0023] A further preferred technical solution: The first short steel bar and the pair of hollow sleeves are located on a pair of sides of the stress-bearing main reinforcement.

[0024] Compared with the prior art, the utility model has the following characteristics and beneficial effects:

[0025] 1. Recyclable: Through the design of adjustable connectors and L-shaped snap steel bars, the recycling of the hanger bars is achieved, reducing the construction cost.

[0026] 2. Improved construction efficiency: By using a mature open-body turnbuckle for transformation to achieve length adjustment, and through a simple plug-lock structure to achieve the locking and disassembly of the steel cage, the prefabrication and standardized design are simple and reliable, improving the construction efficiency.

[0027] The use of reusable hanger bars for the steel cage makes the installation and removal of the steel cage more convenient, thus reducing the construction time; through standardization and prefabrication, the on-site steel bar binding workload is reduced, improving the construction efficiency.

[0028] 3. High construction quality and safety: The precise positioning hole design and stable structure ensure the construction quality and reduce the construction risk.

[0029] The adjustable hanger bars for the steel cage can ensure the accuracy of its shape and size, reducing the errors caused by welding and cable fixing.

[0030] Reduce on-site construction risks: Due to the prefabrication and standardization of the hanger bars, the complexity of on-site operations is reduced, the site requirements do not need to be considered, and the risk of construction accidents is reduced; the detachable process improves the quality and stability of the formed steel cage, reducing the possible structural problems during the construction process.

[0031] 4. Reduce construction costs: The workload of on-site steel bar binding and welding is reduced, thus reducing the labor cost. Since the steel cage can be reused, the demand for steel materials is reduced, and the generation of waste is reduced.

[0032] 5. Environmentally friendly: Standardized, prefabricated, and reusable hanger bars can reduce the demand for new materials, helping to save resources; the amount of waste generated during construction is reduced, reducing the impact on the environment.

[0033] 6. Enhance construction flexibility: The reusable hanger bars for the steel cage can be adjusted according to different project requirements. Under the condition of ensuring strength, the number of processes and steps is reduced as much as possible to increase the operation efficiency. Reduce the loss of hanger bars as construction measures, and increase the number of reusable times. Adapt to diverse construction requirements. Provide technical solutions applicable to multiple occasions, reduce the difficulty and loss caused by secondary processing, and ensure the versatility and practicality of this technical solution. Description of the Drawings

[0034] Figure 1 is a schematic diagram of the recyclable hanger bars for the bored cast-in-place pile steel cage of the present utility model Figure 1 ;

[0035] Figure 2Schematic diagram of the recyclable suspension bar for the steel cage of bored cast-in-place pile of the present utility model Figure 2 ;

[0036] Figure 3 Schematic diagram of the recyclable suspension bar for the steel cage of bored cast-in-place pile of the present utility model Figure 3 ;

[0037] Figure 4 Schematic diagram of the recyclable suspension bar for the steel cage of bored cast-in-place pile of the present utility model Figure 4 ;

[0038] Reference numerals: 1, main reinforcement of lifting ring; 2, L-shaped snap reinforcement; 3, length adjustment connector; 4, main stress reinforcement; 5, positioning hole; 6, hollow sleeve; 7, first short reinforcement; 8, second short reinforcement. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] The construction process of traditional bored cast-in-place piles includes steps such as drilling, placing the steel cage, and pouring concrete. Among them, the hoisting and positioning of the steel cage are key links to ensure the quality of the pile foundation. The present utility model provides a construction structure for vertical positioning of the steel cage of bored cast-in-place piles that can meet the requirements of high efficiency and cost saving in the construction of bored cast-in-place pile steel bars, with fast construction speed and high quality.

[0041] See Figures 1 to 4 As shown, a recyclable suspension bar for the steel cage of bored cast-in-place pile of the present utility model.

[0042] The recyclable suspension bar for the steel cage of bored cast-in-place pile includes a main reinforcement 1 of the lifting ring and a main stress reinforcement 4. The length adjustment connector 3 is adjustably connected between the main reinforcement 1 of the lifting ring and the main stress reinforcement 4. A positioning hole device is provided at the bottom of the main stress reinforcement 4, and a positioning hole locking device is provided between the main reinforcement 1 of the lifting ring and the main stress reinforcement 4;

[0043] The main reinforcement 1 of the lifting ring is bent from threaded steel, with a ring shape at the upper part and a vertical shape at the lower part; as the main load-bearing member, it is connected to the steel cage;

[0044] The main stress reinforcement 4 is threaded steel, and the main stress reinforcement is provided with various length specifications to match the length adjustment connector according to the requirements of the suspension bar;

[0045] The length-adjustable connector 3 is a long, annular steel piece in the shape of an open turnbuckle, with upper and lower butt-welded holes. The main reinforcement 1 of the eyelet is inserted into the upper hole and fastened with a nut, and the main reinforcement 4 is inserted into the lower hole and fastened with a nut. The length can be fine-tuned to adapt to changes in the support elevation of the orifice, and can be adapted to different lengths of the main reinforcement body. It is used to adjust the overall length of the reinforcement over a wide range to accommodate bored piles of different depths.

[0046] The positioning hole device includes a first short steel bar 7 welded to the bottom end of the stressed main reinforcement 4, the lower part of the first short steel bar 7 extends out of the stressed main reinforcement 4 to form an extension, the lower part of the extension is welded to a second short steel bar 8, and a gap is left between the second short steel bar 8 and the stressed main reinforcement 4 to form a positioning hole 5; the second short steel bar 8 is aligned with the center of the stressed main reinforcement 4, and the diameters of the first short steel bar 7 and the second short steel bar 8 are the same as those of the stressed main reinforcement 4, and the bottom surfaces of the first short steel bar 7 and the second short steel bar 8 are flush;

[0047] The positioning hole locking device includes a pair of hollow sleeves 6 with their centers aligned and an L-shaped clip steel bar 2 connected between the pair of hollow sleeves 6; the upper hollow sleeve 6 is lap-welded to the bottom of the stressed main reinforcement 4, and its bottom surface is flush with the bottom surface of the stressed main reinforcement 4; the lower hollow sleeve 6 is lap-welded to the second short reinforcement 8, and its top surface is flush with the top surface of the second short reinforcement 8, that is, the pair of hollow sleeves 6 are directly opposite to the positioning hole 5; the L-shaped clip steel bar 2 is L-shaped, the bottom is connected between the pair of hollow sleeves 6 to close the positioning hole 5, and the top L-shaped part is clamped in the annular part of the main reinforcement 1 of the eye;

[0048] The first short steel bar 7 and a pair of hollow sleeves 6 are located on one side of the main reinforcement 4;

[0049] The L-shaped clip steel bar 2 is used to connect the main reinforcement of the lifting ring and the steel cage, and its L-shaped structure enables rapid fixing and disassembly;

[0050] The utility model discloses a method for manufacturing a recyclable bored cast-in-place pile reinforcement cage suspension bar:

[0051] 1. Prefabricated lifting ring main reinforcement: According to the design requirements, standard size threaded steel bars are used to make the lifting ring main reinforcement.

[0052] 2. Connection between the main reinforcement 1 of the lifting ring and the main reinforcement 4: Connect the main reinforcement of the lifting ring and the main reinforcement 4 by adjusting the length of the connecting piece to ensure the adjustability and structural stability of the main reinforcement of the lifting ring.

[0053] 3. Formation of positioning holes: weld the first short steel bar below the main reinforcement to form one side of the positioning hole, and use a hollow sleeve on the other side to overlap and weld with the main reinforcement and the second short steel bar at the bottom to ensure accurate fixation of the L-shaped clip steel bar.

[0054] 4. Fixing of L-shaped buckle steel bars: Pass the L-shaped buckle steel bars through a pair of hollow sleeves to form a stable structure with the main reinforcement bars of the lifting rings, facilitating hoisting.

[0055] 5. Application of length-adjusting connectors: Determine the use length through design calculation, and use the length-adjusting connectors to adjust the length of the suspender bars to meet different construction requirements.

[0056] Construction method of a recyclable suspender bar for bored cast-in-place pile cage of the utility model:

[0057] 1. Prefabrication of the suspender bars for the pile cage: In the processing yard environment, prefabricate the main reinforcement bars of the lifting rings, the stressed main reinforcement bars 4, the L-shaped buckle steel bars, the length-adjusting connectors, the positioning hole devices and the positioning hole locking devices according to the design requirements, with reliable welding quality.

[0058] 2. Adjustment of the length of the suspender bars: After the suspender bars are processed, calculate the use length through design according to the on-site bored depth, and adjust the length of the suspender bars through the length-adjusting connectors to ensure construction adaptability.

[0059] 3. Preparation before hoisting the pile cage: Pass the positioning holes through the external positioning steel bars of the pile cage, pass the lower part of the L-shaped buckle steel bars through a pair of hollow sleeves, pass the upper part of the L-shaped buckle steel bars through the annular part of the main reinforcement bars of the lifting rings, and connect and fix them with the main reinforcement bars of the lifting rings to fix the pile cage and the suspender bars to form an integral stable structure for convenient lifting.

[0060] 4. Hoisting of the pile cage and concrete pouring: Hoist the pile cage to the predetermined position and conduct concrete pouring.

[0061] 5. Recycling of the suspender bars: When the concrete pouring is close to the pile top and it is determined that the lower part of the concrete wraps and fixes the pile cage without deviation and settlement, rotate the L-shaped buckle steel bars for disassembly, take out the whole suspender bars, clean and maintain them for future recycling.

[0062] Detailed description of the solution of the utility model: The utility model includes a plurality of main suspension ring bars, L-shaped buckle steel bars, length-adjusting connectors, main stress bars, positioning holes and hollow sleeves; The overall use of welding technology, the length-adjusting connector uses a modified open-body flower basket and adds a locking device, that is, a nut. The main suspension ring bar and the main stress bar are connected through the length-adjusting connector to achieve length fine-tuning. The main stress bar is designed with a variety of length specifications according to the requirements of the suspension bar to match the length-adjusting connector. The lower part of the main stress bar and a section of the first short steel bar are butt-welded to form a unidirectionally sealed positioning hole. On the other side, a pair of hollow sleeves are respectively lap-welded with the main stress bar and the second short steel bar at the bottom to form a positioning hole. The centers of the two hollow sleeves are aligned. The L-shaped buckle steel bar passes through a pair of hollow sleeves to lock the reinforcement cage stirrups. The top of the L-shaped buckle is appropriately connected to the annular part of the main suspension ring bar to ensure structural stability; After the suspension bar is processed, the use length is accurately calculated by rechecking the ground elevation of the hole position, and the length is adjusted by using the length-adjusting connector; The positioning hole passes through the topmost stirrup of the reinforcement cage, and the L-shaped buckle steel bar passes through the hollow sleeve, and the L-shaped buckle passes through the suspension ring to realize the vertical positioning of the reinforcement cage and ensure the accuracy of the pile top elevation; When the concrete is poured to the top of the reinforcement cage close to the pile top, that is, the locking position, the lower sling determines to relax the suspension bar. After determining that the reinforcement cage has been completely wrapped and fixed by the poured concrete, rotate the L-shaped buckle steel bar and pull it out, and rotate the suspension ring to release the buckle, then the whole can be taken out to realize turnover use.

[0063] The existing suspension bars of the reinforcement cage adopt traditional welding technology, which can meet the actual needs to a certain extent, but there are still the following problems: 1. The suspension bar needs to consider the overall weight of the reinforcement cage, and has high requirements for the tensile strength of raw materials and connection positions. Usually, large-diameter high-strength round steel is required, and the welding quality requirements are strict to ensure that the strength requirements during use are met; However, in the traditional method, the suspension bar is welded to the anchor bar at the top of the main reinforcement bar of the reinforcement cage. The main reinforcement bar of the reinforcement cage is usually a threaded steel bar, and its tensile strength is lower than that of the same-grade round steel. After years of investigation and research, the problems are concentrated in the damage of the anchor bar connected to the suspension bar and the damage of the weld; 2. The traditional welding technology relies on measuring the length of the suspension bar with a ruler. To ensure verticality and stable force, the suspension bar and the main reinforcement bar are directly lap-welded. This not only damages the main reinforcement bar and affects the forming quality of the reinforcement cage, but also cannot be removed for recycling, resulting in large material losses; The suspension bar is not removed before and after breaking the pile head. To protect the finished pile foundation, the working area of the machine is restricted, affecting the working efficiency of the machine operation.

[0064] Advantages of the present utility model: Improve construction efficiency: Standardized prefabrication and adjustable design significantly reduce on-site operation time; Reduce construction costs: Reduce on-site binding and welding work, lowering labor costs and material waste; Improve construction quality: Ensure the accuracy and stability of the hanger bars, reducing construction errors; Environmentally friendly: Recyclability reduces resource consumption and waste generation; Improve safety: Reduce on-site construction risks, enhancing the controllability and safety of the construction process; Enhance construction flexibility: Adjustable design adapts to different construction requirements, improving the flexibility of construction plans; Reduce the loss of hanger bars as construction measures and increase the number of turnover times; Under the condition of ensuring strength, minimize the number of processes and steps as much as possible to increase operation efficiency; Provide technical solutions applicable to multiple scenarios, reduce the difficulty and loss caused by secondary processing, and ensure the versatility and practicality of the technical solutions.

[0065] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0066] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A recyclable suspension bar for the steel reinforcement cage of a bored cast-in-place pile, characterized in that: It includes the hanging ring main reinforcement (1) and the stress main reinforcement (4). The length-adjusting connecting piece (3) is adjustably connected between the hanging ring main reinforcement (1) and the stress main reinforcement (4). A positioning hole device is provided at the bottom of the stress main reinforcement (4), and a positioning hole locking device is provided between the hanging ring main reinforcement (1) and the stress main reinforcement (4). The hanging ring main reinforcement (1) is formed by bending a threaded steel bar, with the upper part being annular and the lower part being vertical. The stress main reinforcement (4) is a threaded steel bar. The length-adjusting connecting piece (3) is a long strip-shaped annular steel piece, with an upper through-hole and a lower through-hole welded to the upper and lower parts respectively. The hanging ring main reinforcement (1) passes through the upper through-hole and is fastened by a nut. The stress main reinforcement (4) passes through the lower through-hole and is fastened by a nut. The positioning hole device includes a section of the first short steel bar (7) that is fillet-welded to the bottom end of the stress main reinforcement (4). The lower part of the first short steel bar (7) extends out of the stress main reinforcement (4) to form an extension part. A second short steel bar (8) is fillet-welded to the lower part of the extension part. A gap is left between the second short steel bar (8) and the stress main reinforcement (4) to form a positioning hole (5). The positioning hole locking device includes a pair of hollow sleeves (6) that are centered and an L-shaped buckle steel bar (2) that passes through between the pair of hollow sleeves (6). The pair of hollow sleeves (6) are in alignment with the positioning hole (5). The L-shaped buckle steel bar (2) is L-shaped, with the bottom passing through between the pair of hollow sleeves (6) to close the positioning hole (5), and the top L-shaped part being clamped inside the annular part of the hanging ring main reinforcement (1).

2. The recyclable suspension bar for the steel cage of bored cast-in-place pile according to claim 1, wherein: The second short steel bar (8) is centered with the stress main reinforcement (4).

3. The recyclable suspension bar for the drilling cast-in-place pile reinforcement cage according to claim 1, characterized in that: The diameters of the first short steel bar (7) and the second short steel bar (8) are the same as that of the stress main reinforcement (4).

4. The recyclable suspension bar for the steel cage of bored cast-in-place pile according to claim 1, characterized in that: The bottom surfaces of the first short steel bar (7) and the second short steel bar (8) are flush.

5. The recyclable suspension bar for the drilling cast-in-place pile steel reinforcement cage according to claim 1, characterized in that: The upper hollow sleeve (6) is fillet-welded to the bottom of the stress main reinforcement (4), and its bottom surface is flush with the bottom surface of the stress main reinforcement (4).

6. The recyclable suspension bar for the steel cage of bored cast-in-place pile according to claim 1, wherein: The lower hollow sleeve (6) is fillet-welded to the second short steel bar (8), and its top surface is flush with the top surface of the second short steel bar (8).

7. The recyclable suspension bar for the bored cast-in-place pile reinforcement cage according to claim 1, characterized in that: The first short steel bar (7) and the pair of hollow sleeves (6) are located on one side of the stress main reinforcement (4).

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