A prefabricated tubular pile column steel support node

Abstract

The utility model relates to building technical field discloses a prefabricated pipe pile stand column steel support joint, including prefabricated pipe pile stand column, the pile head is arranged at the top of prefabricated pipe pile stand column, the microexpansion concrete filling core is equipped in prefabricated pipe pile stand column, the microexpansion concrete filling core bottom end is fixedly connected circular thin steel plate through anchor bar, the top end fixedly connected with anchor plate of anchor bar, the pile head is equipped with longitudinal reinforcement framework and transverse stirrup, steel support, steel support sets up on anchor plate, and the groove section steel is connected through the welding of the angle weld of steel support side surface and forms. In the utility model, the longitudinal reinforcement framework and transverse stirrup are arranged in the pile head to form the reinforcement net cage, and the microexpansion concrete filling core is adopted to pour to enhance the bending, shearing strength of pile head, and the connecting structure of anchor bar, anchor plate and circular thin steel plate makes steel support load can be evenly transmitted to prefabricated pipe pile stand column through anchor plate, and the reliable bearing capacity and crack resistance of node are ensured.

Description

Technical Field

[0001] This utility model relates to the field of building technology, and in particular to a precast pipe pile column steel support node. Background Technology

[0002] In pile-supported retaining structures for foundation pit engineering, vertical support components are typically composed of columns and piles. Columns are often angle steel lattice columns or steel profile columns, while piles are usually cast-in-place piles or square piles. Currently, when conditions permit, projects tend to utilize the engineering piles of the main structure as part of the support system. Therefore, optimizing the connection structure and construction technology between the engineering pile columns and the steel supports has become an important direction in engineering technology.

[0003] In the existing technology, the joint connection structure between the engineering pile column and the steel support has shortcomings in terms of bearing capacity, crack resistance and load transfer efficiency. Specifically, the overall structure of the pile head is weak, shrinkage cracks are prone to occur after concrete pouring, and the load transfer path between the steel support and the column is not clear enough, which may lead to uneven stress at the joint and affect the reliability and durability of the support system. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a precast pipe pile column steel support node, which aims to improve the existing technology's weak overall structure of the pile head, the tendency to generate shrinkage cracks after concrete pouring, and the unclear load transfer path between the steel support and the column, which may lead to uneven stress on the node and affect the reliability and durability of the support system.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a precast pipe pile column steel support node, comprising:

[0006] A precast pipe pile column, wherein a pile head is provided at the top of the precast pipe pile column, and a micro-expansion concrete core is provided inside the precast pipe pile column. The bottom end of the micro-expansion concrete core is fixedly connected to a thin circular steel plate by an anchor bar, and an anchor plate is fixedly connected to the top end of the anchor bar.

[0007] The pile head is equipped with a longitudinal steel reinforcement cage and transverse stirrups;

[0008] A steel support is provided on the anchor plate, and channel steel is connected to the side of the steel support by welding fillet welds.

[0009] By adopting the above technical solutions, and by setting longitudinal steel reinforcement cages and transverse stirrups inside the pile head to form a steel mesh cage, the steel support load can be evenly transferred to the precast pipe pile column through the anchor plate, ensuring that the joint has reliable bearing capacity and crack resistance. Using precast pipe piles as column piles, compared with traditional cast-in-place piles, eliminates the complex process of on-site pouring and curing time, significantly improving construction efficiency. At the same time, the material cost of precast pipe piles is lower, and there is no need for a large number of on-site operation equipment, reducing labor and machinery input, effectively reducing project costs and improving project economic indicators.

[0010] As a further description of the above technical solution:

[0011] An overflow hole is provided on the anchor plate, and the top surface of the anchor plate exposes the pile head.

[0012] By adopting the above technical solutions, air inside the pile head is discharged through the overflow hole to avoid the formation of air bubble cavities. By observing whether concrete overflows from the overflow hole, the pouring height is monitored in real time to ensure that it reaches the design elevation.

[0013] As a further description of the above technical solution:

[0014] The number of anchor bars is no less than 4, and they are fixed to the round thin steel plate by welding.

[0015] By adopting the above technical solutions, multiple anchor bars are symmetrically distributed, which enhances the bond strength with the micro-expansion concrete core, improves the overall shear and bending resistance of the pile head, and prevents stress concentration by having multiple anchor bars work together.

[0016] As a further description of the above technical solution:

[0017] The longitudinal steel reinforcement cage includes main reinforcement bar one and main reinforcement bar two, which are equidistantly distributed inside the pile head.

[0018] By adopting the above technical solutions, the longitudinal steel reinforcement cage is formed by the main reinforcement bar 1 and the main reinforcement bar 2 being distributed at equal intervals inside the pile head, forming the main vertical load-bearing structure.

[0019] As a further description of the above technical solution:

[0020] The transverse stirrups include stirrup one and stirrup two, which are equidistantly distributed inside the pile head.

[0021] By adopting the above technical solutions, the transverse stirrups are formed by stirrup one and stirrup two being distributed at equal intervals inside the pile head to form the transverse load-bearing main body.

[0022] As a further description of the above technical solution:

[0023] The longitudinal steel reinforcement cage and the transverse stirrups are connected by binding.

[0024] By adopting the above technical solutions, a closed steel mesh cage is formed by binding and connecting the longitudinal main bars.

[0025] As a further description of the above technical solution:

[0026] The lower end of the precast pipe pile column is embedded in the soil and rock below the bottom of the foundation pit, and a water-stop steel plate is installed between the precast pipe pile column and the basement floor slab.

[0027] By adopting the above technical solutions, a stable vertical bearing foundation is provided for the steel support node, blocking the seepage path of groundwater along the pile body and avoiding soil erosion that could cause the soil around the pile to loosen.

[0028] As a further description of the above technical solution:

[0029] The height of the micro-expansion concrete core is 1.5m, and the thickness of the circular thin steel plate is 5mm.

[0030] By adopting the above technical solutions, it can be ensured that a sufficiently deep rigid load-bearing body is formed in the pile head area.

[0031] This utility model has the following beneficial effects:

[0032] 1. In this utility model, a steel mesh cage is formed by setting a longitudinal steel reinforcement skeleton and a transverse stirrup inside the pile head, and micro-expansion concrete is poured to fill the core to enhance the bending and shear strength of the pile head. The connection structure of the anchor bar, anchor plate, and round thin steel plate enables the steel support load to be evenly transferred to the precast pipe pile column through the anchor plate, ensuring that the node has reliable bearing capacity and crack resistance.

[0033] 2. In this utility model, precast pipe piles are used as column piles. Compared with traditional cast-in-place piles, their factory prefabrication characteristics save the complex process of on-site pouring and curing time, significantly improving construction efficiency. At the same time, the material cost of precast pipe piles is lower, and there is no need for a large number of on-site operation equipment, reducing labor and machinery input, effectively reducing project cost, and improving project economic indicators. Attached Figure Description

[0034] Figure 1 This utility model provides a schematic diagram of the connection between the precast pipe pile column and the steel support in a precast pipe pile column steel support node.

[0035] Figure 2 This is a partial structural diagram of the main reinforcement of a precast pipe pile column steel support node proposed in this utility model.

[0036] Figure 3 This is a schematic diagram of the stirrup structure of a precast pipe pile column steel support node proposed in this utility model.

[0037] Figure 4This is a schematic diagram of the precast pipe pile head treatment for a precast pipe pile column steel support node proposed in this utility model.

[0038] Figure 5 This is a partial structural diagram of the anchor bar of a precast pipe pile column steel support node proposed in this utility model;

[0039] Figure 6 This is a partial structural diagram of the anchor plate of a precast pipe pile column steel support node proposed in this utility model;

[0040] Figure 7 This is a schematic diagram of the channel steel structure of a precast pipe pile column steel support node proposed in this utility model;

[0041] Figure 8 This is a detailed drawing of the connection between the steel support and the pile head of a precast pipe pile column steel support node proposed in this utility model.

[0042] Legend:

[0043] 1. Precast pipe pile column; 2. Pit bottom; 3. Water-stop steel plate; 4. Basement floor slab; 5. Pile head; 6. Anchor plate; 7. Channel steel; 8. Steel support; 9. Fillet weld; 10. Micro-expansion concrete core filler; 11. Main reinforcement 1; 12. Main reinforcement 2; 13. Stirrup 1; 14. Stirrup 2; 15. Anchor bar; 16. Round thin steel plate; 17. Overflow hole. Detailed Implementation

[0044] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] Reference Figure 1 - Figure 8 One embodiment of this utility model is a precast pipe pile column steel support node, comprising:

[0046] The precast pipe pile column 1 has a pile head 5 at the top and a micro-expansion concrete core 10 inside. The bottom end of the micro-expansion concrete core 10 is fixedly connected to a thin round steel plate 16 through an anchor bar 15, and the top end of the anchor bar 15 is fixedly connected to an anchor plate 6.

[0047] The pile head 5 is equipped with a longitudinal steel reinforcement cage and transverse stirrups;

[0048] Steel support 8 is installed on anchor plate 6. The side of steel support 8 is connected to channel steel 7 by welded fillet weld 9.

[0049] Specifically, the precast pipe pile column 1 serves as the foundation load-bearing component. The top pile head 5 is the connection area of ​​the steel support 8. The longitudinal steel reinforcement skeleton set inside the pile head 5 is tied with the transverse stirrups to form a steel mesh cage, which enhances the integrity of the pile head. The micro-expansion concrete core 10 compensates for shrinkage and inhibits cracks through its micro-expansion characteristics. The bottom end is fixed with a thin circular steel plate 16 by anchor bars 15 to limit the core concrete. The top of the anchor bars 15 is connected to the anchor plate 6. The top surface of the anchor plate 6 is exposed above the pile head and has an overflow hole 17 for pouring air and height monitoring. The steel support 8 is erected on the anchor plate 6 and is connected to the channel steel 7 by side weld fillet welds 9, forming a limiting structure that restricts the horizontal and vertical displacement of the steel support 8, so that the load of the steel support 8 is evenly transferred to the precast pipe pile column 1 through the anchor plate 6.

[0050] Reference Figure 2 and Figure 5 An overflow hole 17 is provided on the anchor plate 6, and the top surface of the anchor plate 6 exposes the pile head 5.

[0051] Specifically, during the micro-expansion concrete pouring process, air inside the pile head 5 is discharged through the overflow hole 17 to avoid the formation of air bubble cavities. By observing whether concrete overflows from the overflow hole 17, the pouring height is monitored in real time to ensure that it reaches the design elevation. This ensures that the micro-expansion concrete core 10 is poured fully and tightly bonded to the bottom surface of the anchor plate 6, guaranteeing the accurate elevation of the top of the core and matching the installation height of the anchor plate 6, thereby improving the overall integrity of the joint and the efficiency of load transfer. The top surface of the anchor plate 6, exposed above the pile head 5, provides a direct platform for the steel support 8, allowing the channel steel 7 to form a rigid connection with the anchor plate 6 through welding. This enables the load of the steel support 8 to be evenly transferred to the precast pipe pile column 1 through the anchor plate 6, ensuring reliable stress distribution at the joint.

[0052] Reference Figure 3 and Figure 6 The number of anchor bars 15 shall not be less than 4, and they shall be fixed to the round thin steel plate 16 by welding.

[0053] Specifically, the lower end of the anchor bar 15 is welded and fixed to the thin circular steel plate 16, and the upper end is connected to the anchor plate 6, forming a force transmission path that penetrates the core-filling concrete. This evenly transfers the load of the steel support 8 to the precast pipe pile column 1. The thin circular steel plate 16 is rigidly connected by welding to limit the displacement of the core-filling concrete and prevent the bottom from becoming void. Multiple anchor bars 15 are symmetrically distributed to enhance the bond strength with the micro-expansion concrete core 10, improve the overall shear and bending resistance of the pile head 5, and prevent stress concentration by working together to ensure that the load of the steel support 8 is evenly transferred to the pile body, thereby improving the node bearing efficiency and durability.

[0054] Reference Figure 1 - Figure 4The longitudinal steel reinforcement cage includes main reinforcement bar 11 and main reinforcement bar 22, which are equidistantly distributed inside the pile head 5; the transverse stirrups include stirrup bar 13 and stirrup bar 24, which are equidistantly distributed inside the pile head 5; the longitudinal steel reinforcement cage and the transverse stirrups are connected by binding.

[0055] Specifically, the longitudinal steel reinforcement cage consists of main reinforcement 11 and main reinforcement 22 equidistantly distributed inside the pile head 5, forming the vertical load-bearing main body. The transverse stirrups consist of stirrup 13 and stirrup 24 equidistantly distributed inside the pile head 5. By binding the longitudinal main reinforcements, a closed steel reinforcement cage is formed. The longitudinal main reinforcements bear the bending load, and the transverse stirrups restrain the concrete and bear the shear force. The two work together to improve the overall integrity of the pile head. The steel reinforcement cage effectively suppresses the shrinkage cracks of the micro-expansion concrete core 10, enhances the bending and shear strength of the pile head 5, and forms a rigid connection system with the anchor bar 15 and anchor plate 6 to ensure that the load of the steel support 8 is evenly transferred to the precast pipe pile column 1.

[0056] Reference Figure 1 The lower end of the precast pipe pile column 1 is embedded in the soil and rock below the bottom of the foundation pit 2, and a water-stop steel plate 3 is installed between the precast pipe pile column 1 and the basement floor slab 4.

[0057] Specifically, the lower end of the precast pipe pile column 1 is embedded in the soil and rock below the bottom 2 of the foundation pit and anchored to the bearing layer, providing a stable vertical bearing foundation for the steel support node 8. The water-stop steel plate 3 is set in a ring at the junction of the precast pipe pile column 1 and the basement floor slab 4 to block the seepage path of groundwater along the pile body and prevent groundwater from entering the basement later.

[0058] Reference Figure 2 The height of the micro-expansion concrete core 10 is 1.5m, and the thickness of the round thin steel plate 16 is 5mm.

[0059] Specifically, a core filling height of 1.5m ensures that the pile head 5 area forms a rigid load-bearing body with sufficient depth, which, together with the anchor bar 15 and the steel mesh cage, enhances the bending and shear resistance. As the bottom limiting template of the micro-expansion concrete core filling 10, the anchor bar 15 is fixed by welding to prevent concrete loss during pouring.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present 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 the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precast pipe pile column steel support node, characterized in that, include: A precast pipe pile column (1) is provided with a pile head (5) at the top of the precast pipe pile column (1). The precast pipe pile column (1) is provided with a micro-expansion concrete core (10). The bottom end of the micro-expansion concrete core (10) is fixedly connected to a thin round steel plate (16) by an anchor bar (15). The top end of the anchor bar (15) is fixedly connected to an anchor plate (6). The pile head (5) is provided with a longitudinal steel reinforcement cage and transverse stirrups; A steel support (8) is provided on the anchor plate (6), and a channel steel (7) is connected to the side of the steel support (8) by forming a fillet weld (9).

2. The precast pipe pile column steel support node according to claim 1, characterized in that: An overflow hole (17) is provided on the anchor plate (6), and the top surface of the anchor plate (6) exposes the pile head (5).

3. The precast pipe pile column steel support node according to claim 1, characterized in that: The number of anchor bars (15) is not less than 4, and they are fixed to the round thin steel plate (16) by welding.

4. A precast pipe pile column steel support node according to claim 1, characterized in that: The longitudinal steel reinforcement cage includes main reinforcement one (11) and main reinforcement two (12), which are equidistantly distributed inside the pile head (5).

5. A precast pipe pile column steel support node according to claim 1, characterized in that: The transverse stirrups include stirrup one (13) and stirrup two (14), which are equidistantly distributed inside the pile head (5).

6. A precast pipe pile column steel support node according to claim 1, characterized in that: The longitudinal steel reinforcement cage and the transverse stirrups are connected by binding.

7. A precast pipe pile column steel support node according to claim 1, characterized in that: The lower end of the precast pipe pile column (1) is embedded in the soil and rock below the bottom of the foundation pit (2), and a water-stop steel plate (3) is provided between the precast pipe pile column (1) and the basement floor slab (4).

8. A precast pipe pile column steel support node according to claim 1, characterized in that: The height of the micro-expansion concrete core (10) is 1.5m, and the thickness of the circular thin steel plate (16) is 5mm.

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