A new pile cap foundation extension end column structure

Abstract

The utility model relates to the technical field of building construction discloses a novel pile cap foundation extension end column structure, including pile cap, a plurality of fixed piles are fixedly connected with the pile cap bottom, the pile cap top is fixedly connected with the preliminary structure column, the preliminary structure column one side is fixedly connected with the foundation beam, the pile cap top is provided with the extension assembly, the extension assembly includes a plurality of reinforcing steel bars, a plurality of reinforcing steel bars bottom end penetrates the inside of pile cap, a plurality of reinforcing steel bars top end is located the top of pile cap, each reinforcing steel bar top end is fixedly connected with metal protection pipe, each metal protection pipe one side is fixedly connected with the grouting pipe, each metal protection pipe outer wall is provided with the protection subassembly, in the utility model, through presetting a set of extension assembly with multiple protection, effectively solved the reserved reinforcing steel bar because long -term burying and rust, and the technical problem that traditional lap joint process is complex and the quality is difficult to guarantee.

Description

Technical Field

[0001] This utility model relates to the field of building construction, and in particular to a novel pile cap foundation expansion end column structure. Background Technology

[0002] In the construction engineering field, with the increasing demand for renovation and expansion in the construction market, pile cap foundation buildings often face subsequent expansion operations due to capacity expansion and development planning needs. As a key component that transfers the load of the superstructure to the pile foundation, the performance stability of the reserved structure of the pile cap directly affects the structural safety and durability of the overall building after expansion. In pile cap building scenarios with anticipated expansion, ensuring the performance of the reserved structure throughout its long-term service life becomes a core issue concerning both project quality and the efficiency of subsequent expansion.

[0003] When reserving expansion connection structures for existing pile cap foundation buildings, the reserved steel bars are mostly directly embedded, relying on the concrete environment of the foundation for natural protection. In the later expansion connection stage, the traditional process mainly uses steel bar lap splicing. The new structural steel bars are connected to the reserved steel bars by binding or welding. The mechanical interlocking between the steel bars and the force transmission of the weld are used to realize the force transfer between the old and new structures.

[0004] In existing technologies, if the pre-embedded steel bars are embedded in coastal or inland saline-alkali lands or in northern regions where de-icing agents are used in winter, chloride ions will penetrate into the concrete through groundwater and surface runoff. They are also prone to corrosion due to moisture and corrosive media in the environment. Corrosion not only weakens the mechanical properties of the steel bars themselves, but also affects the connection with the expansion structure in the later stages, posing a hidden danger to the overall safety of the building. This makes it difficult to meet the requirements of long-term use and reliable expansion of pile cap foundation buildings. Therefore, a new type of pile cap foundation expansion end column structure is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a novel pile cap foundation expansion end column structure, which aims to improve the problem that the reserved steel bars are often buried in coastal, inland saline-alkali land or northern regions where de-icing agents are used in winter. In such environments, the steel bars lack targeted protection and are easily corroded by moisture and corrosive media. Corrosion not only weakens the mechanical properties of the steel bars themselves, but also affects the connection effect with the expansion structure in the later stage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A novel pile cap foundation expansion end column structure includes a pile cap, with multiple fixed piles fixedly connected to the bottom of the pile cap, a pre-construction column fixedly connected to the top of the pile cap, a foundation beam fixedly connected to one side of the pre-construction column, and an expansion component provided on the top of the pile cap.

[0008] The expansion component includes multiple reinforcing bars, the bottom ends of which penetrate the interior of the pile cap, and the top ends of which are located on the top of the pile cap. Each reinforcing bar has a metal protective pipe fixedly connected to its top end, a grouting pipe fixedly connected to one side of each metal protective pipe, and a protective component provided on the outer wall of each metal protective pipe.

[0009] As a further description of the above technical solution:

[0010] Each of the protective components includes a rubber protective sleeve, each of the rubber protective sleeves is located at the bottom end of the metal protective tube, and each of the rubber protective sleeves is fitted and connected to the outer wall of multiple reinforcing bars on the top of the exposed pile cap.

[0011] As a further description of the above technical solution:

[0012] A sealing strip is provided between each of the rubber protective sleeves and the metal protective tubes, and the sealing strip is used to seal the connection between the rubber protective sleeves and the metal protective tubes.

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

[0014] Each of the metal protective tubes has a sealing plug 2 slidably connected to its inner wall, and each of the metal protective tubes has a sealing plug 1 slidably connected to its inner wall.

[0015] As a further description of the above technical solution:

[0016] Each of the sealing plugs has a connecting post fixedly connected to its top end, and each connecting post has a pull ring rotatably connected inside.

[0017] As a further description of the above technical solution:

[0018] The outer walls of the plurality of rubber protective sleeves are provided with extended end posts, which are located on the top of the pile cap.

[0019] This utility model has the following beneficial effects:

[0020] This invention effectively solves the technical problems of corrosion of pre-reserved reinforcing bars due to long-term burial in coastal or inland saline-alkali land, or in northern regions where de-icing agents are used in winter, as well as the complexity and quality assurance issues of traditional lap splicing processes, through an expansion component with multiple protections. The structure, through a protective system composed of metal pipes, rubber sleeves, and sealing plugs, greatly enhances the corrosion and moisture resistance of the pre-reserved reinforcing bars, ensuring their mechanical properties. Simultaneously, the use of a sleeve grouting connection method during expansion significantly enhances the anchoring force and force transmission efficiency at the connection point compared to traditional lap splicing, making the expansion section more firmly integrated with the original foundation, and comprehensively improving the safety and durability of the overall structure. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a novel pile cap foundation expansion end column structure proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of a rubber protective sleeve structure for a novel pile cap foundation expansion end column structure proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of a metal protective pipe structure for a novel pile cap foundation expansion end column structure proposed in this utility model.

[0024] Legend:

[0025] 1. Pile cap; 2. Fixed pile; 3. Pre-construction column; 4. Foundation beam; 5. Extended end column; 6. Reinforcing steel; 7. Rubber protective sleeve; 8. Sealing strip; 9. Metal protective pipe; 10. Sealing plug one; 11. Connecting column; 12. Pull ring; 13. Grouting pipe; 14. Sealing plug two. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1-3 This utility model provides an embodiment of a novel pile cap foundation expansion end column structure, including a pile cap 1. Multiple fixed piles 2 are fixedly connected to the bottom of the pile cap 1. The fixed piles 2 are used to transfer the load of the superstructure to the deep bearing soil layer, achieving the effect of providing a stable foundation for the entire building. A preliminary structural column 3 is fixedly connected to the top of the pile cap 1. This preliminary structural column 3 forms the original load-bearing skeleton of the building. A foundation beam 4 is fixedly connected to one side of the column. This foundation beam 4 is used to connect different foundation units to enhance the integrity and stability of the structural foundation. An expansion component is provided on the top of the pile cap 1. This expansion component provides reliable structural connection points for future expansion of the building, achieving the effect of reserving interfaces in advance and simplifying the difficulty of later construction.

[0028] The expansion assembly includes multiple reinforcing bars 6, with their bottom ends penetrating the interior of the pile cap 1 to effectively transfer the load of the future expansion structure to the foundation. The tops of the reinforcing bars 6 are located at the top of the pile cap 1. Each reinforcing bar 6 has a metal protective tube 9 fixedly connected to its top. This metal protective tube 9 protects the ends of the reinforcing bars 6 during long-term pre-embedding and acts as a connecting sleeve during expansion, achieving a combined protection and connection function. A grouting pipe 13 is fixedly connected to one side of each metal protective tube 9. This grouting pipe 13 injects high-strength grout into the metal protective tube 9 when connecting new reinforcing bars 6 later, achieving a strong bond between the old and new reinforcing bars 6. Each metal protective tube 9 has a protective component on its outer wall, providing a complete, multi-layered protective environment for the pre-embedded reinforcing bars 6. Each protective component includes a rubber protective sleeve 7, located at the bottom of the metal protective tube 9. Each rubber protective sleeve 7 is fitted and connected to the outer wall of the multiple reinforcing bars 6 exposed at the top of the pile cap 1. This rubber protective sleeve 7 wraps around and seals the reinforcing bars. At the base of the reinforcing rib 6, initial protection against water, moisture, and rust is achieved. A sealing strip 8 is installed between each rubber protective sleeve 7 and the metal protective tube 9. This sealing strip 8 seals the joint between the rubber protective sleeve 7 and the metal protective tube 9, preventing moisture from entering and enhancing the overall airtightness of the protection. A second sealing plug 14 is slidably connected to the inner wall of each metal protective tube 9. This second sealing plug 14 slides against the inner wall of the metal protective tube 9, forming a deep protective barrier inside the tube to prevent moisture intrusion. To achieve the desired effect, each metal protective pipe 9 has a slidably connected sealing plug 10 on its inner wall. The sealing plug 10 is used to seal the top opening of the metal protective pipe 9, thus preventing cement slurry or external debris from entering the pipe during construction. Each sealing plug 10 has a fixedly connected connecting post 11 at its top, and each connecting post 11 has a rotatably connected pull ring 12 inside. The pull ring 12 works in conjunction with the connecting post 11 to perform a lifting motion, allowing construction personnel to easily and quickly pull out the sealing plug 10, thereby exposing the interface of the reserved steel bar 6.

[0029] Working principle: At the top of the pile cap 1 supported by multiple fixed piles 2, adjacent to the initial structural columns 3 and foundation beams 4, an expansion component is pre-installed during the initial construction. This component is based on multiple reinforcing bars 6, with its bottom end penetrating and anchored inside the pile cap 1, and its top end remaining on the pile cap 1. To achieve long-term protection of the reserved reinforcing bars 6, a metal protective pipe 9 is connected to the top of each reinforcing bar 6. The pipe opening is sealed by a top sealing plug 10 and an inner sealing plug 14. The top of the sealing plug 10 is also connected to a connecting post 11 and a pull ring 12 for easy removal later. At the lower end of the metal protective pipe 9... The exposed steel reinforcement 6 is wrapped with a rubber protective sleeve 7 as a protective component. A sealing strip 8 is installed at the connection between the rubber protective sleeve 7 and the metal protective pipe 9 to enhance the sealing effect. Finally, concrete is poured around these protective components to form the extended end column 5, which wraps and solidifies the entire reserved structure on the top of the pile cap 1. When future expansion is needed, the construction workers first chisel open the extended end column 5, remove the outer rubber protective sleeve 7 and sealing strip 8, and then pull out the sealing plug 10 and sealing plug 2 14 inside the metal protective pipe 9, exposing the clean and intact reserved steel reinforcement 6. Then, the new extended steel reinforcement 6 is removed from the metal pipe. The top of the protective pipe 9 is inserted and overlaps with the reserved reinforcing steel 6. Finally, high-strength, non-shrink grout is injected into the pipe through the grouting pipe 13 on the side of the metal protective pipe 9, so that the old and new reinforcing steel 6 are firmly bonded together. This solves the problem that when a building is expanded later, if it is buried in coastal or inland saline-alkali land or in northern regions where de-icing agents are used in winter, chloride ions will penetrate into the concrete through groundwater and surface runoff, causing the reserved connecting reinforcing steel 6 to corrode and deteriorate, resulting in reduced connection strength or failure. It also solves the problem of complicated operation and difficulty in guaranteeing the quality of connecting old and new reinforcing steel 6 in traditional expansion processes. The multi-layered protection system, consisting of rubber protective sleeve 7, sealing strip 8, metal protective tube 9, and internal sealing plugs 10 and 14, greatly enhances the corrosion and moisture protection of the reserved steel bars 6, ensuring that they retain their initial design performance when expansion is required. In addition, the connection method of using metal protective tube 9 as a sleeve and injecting high-strength grout significantly enhances the anchoring force, force transmission efficiency, and structural integrity of the connection point between the new and old steel bars 6 compared to traditional welding or lap joints. This makes the connection between the expanded part and the original foundation more solid and reliable, and comprehensively improves the safety and durability of the overall structure after expansion.

[0030] 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 novel pile cap foundation extension end column structure, comprising a pile cap (1), characterized in that: The bottom of the pile cap (1) is fixedly connected to multiple fixed piles (2), the top of the pile cap (1) is fixedly connected to a pre-construction column (3), a foundation beam (4) is fixedly connected to one side of the pre-construction column (3), and an expansion component is provided on the top of the pile cap (1). The expansion assembly includes multiple reinforcing bars (6), the bottom ends of which penetrate the interior of the pile cap (1), the top ends of which are located at the top of the pile cap (1), each reinforcing bar (6) is fixedly connected to a metal protective pipe (9), each metal protective pipe (9) is fixedly connected to a grouting pipe (13) on one side, and each metal protective pipe (9) is provided with a protective component on its outer wall.

2. The novel pile cap foundation expansion end column structure according to claim 1, characterized in that: Each of the protective components includes a rubber protective sleeve (7), each of the rubber protective sleeves (7) is located at the bottom end of the metal protective tube (9), and each of the rubber protective sleeves (7) is fitted and connected to the outer wall of a plurality of steel bars (6) on the top of the exposed pile cap (1).

3. The novel pile cap foundation expansion end column structure according to claim 2, characterized in that: A sealing strip (8) is provided between each of the rubber protective sleeves (7) and the metal protective tubes (9), and the sealing strips (8) are used to seal the connection between the rubber protective sleeves (7) and the metal protective tubes (9).

4. The novel pile cap foundation expansion end column structure according to claim 3, characterized in that: Each of the metal protective tubes (9) has a sealing plug 2 (14) slidably connected to its inner wall, and each of the metal protective tubes (9) has a sealing plug 1 (10) slidably connected to its inner wall.

5. The novel pile cap foundation extended end column structure according to claim 4, characterized in that: Each of the sealing plugs (10) is fixedly connected to a connecting post (11) at its top end, and each of the connecting posts (11) is rotatably connected to a pull ring (12).

6. The novel pile cap foundation extended end column structure according to claim 5, characterized in that: The outer walls of the multiple rubber protective sleeves (7) are provided with extended end posts (5), which are located on the top of the pile cap (1).

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