Building infrastructure

Abstract

The application discloses a building foundation structure and relates to the field of buildings. The building foundation structure comprises a plurality of reinforcing cages and connecting pieces. The connecting pieces are connected between two adjacent reinforcing cages and are used for connecting the reinforcing cages to form an integral structure. The connecting piece comprises a connecting rib and a wrapping layer. The two ends of the connecting rib are fixedly connected with the two adjacent reinforcing cages. The wrapping layer is connected with the connecting rib and is used for fixing the connecting rib on a bearing medium. The building foundation structure can avoid the situation that the reinforcing cage is lifted up when concrete is poured into the reinforcing cage from the bottom due to the large upward pressure of the poured concrete.

Description

Technical Field

[0001] This application relates to the field of architecture, and more particularly to a building foundation structure. Background Technology

[0002] A cast-in-place pile is a type of pile constructed by drilling a hole in place and then pouring in concrete or reinforced concrete. Common types include bored cast-in-place piles and driven cast-in-place piles. Among them, bored cast-in-place pile construction technology is a concrete technology with low construction costs, simple operation, and no vibration, noise, or soil displacement effect. Currently, bored cast-in-place pile construction technology has been widely used in the field of building construction.

[0003] The construction process for bored piles is as follows: determining the pile location, drilling, cleaning the hole, lowering the reinforcing cage, and pouring concrete. During construction, when the concrete reaches the bottom of the reinforcing cage, the upward pressure from the concrete flowing out of the guide pipe can cause the reinforcing cage to float. If this happens, pouring must be stopped immediately, and the elevation readjusted, which will affect the construction progress. Utility Model Content

[0004] The purpose of this application is to provide a building foundation structure that can prevent the steel cage from floating up due to the large upward pressure of the concrete as it pours out of the guide pipe when the concrete is poured to the bottom of the steel cage.

[0005] To address the aforementioned technical problems, this application provides the following technical solutions:

[0006] This application provides a building foundation structure, including:

[0007] Reinforcing cages, and multiple reinforcing cages are provided;

[0008] Connectors are used to connect two adjacent steel cages to form a whole structure by connecting multiple steel cages.

[0009] The connectors include:

[0010] The connecting bars are fixedly connected at both ends to two adjacent steel cages.

[0011] The wrapping layer is connected to the connecting bar and is used to fix the connecting bar to the load-bearing medium.

[0012] In some modified embodiments of this application, the wrapping layer has a hardening material for anchoring the connecting bars to the load-bearing medium.

[0013] In some modified embodiments of this application, the wrapping layer covers the outer peripheral area of ​​the connecting rib.

[0014] In some modified embodiments of this application, the reinforcing cage has a fixing ring, and the ends of the fixing ring and the connecting bar are fixedly connected.

[0015] In some modified embodiments of this application, the reinforcing cage further includes:

[0016] Vertical ribs, multiple vertical ribs distributed in a ring;

[0017] The outer reinforcing ring is fixedly connected to the outside of multiple vertical reinforcing bars to connect them into a whole. The fixing ring is fixedly connected to the outer reinforcing ring.

[0018] In some modified embodiments of this application, the retaining ring is welded to the top surface of the outer reinforcing ring.

[0019] In some modified embodiments of this application, the reinforcing cage further includes:

[0020] The inner reinforcing ring is fixedly connected to the inside of multiple vertical reinforcing bars.

[0021] In some modified embodiments of this application, multiple inner reinforcing rings and multiple outer reinforcing rings are staggered along the extension direction of the vertical reinforcing bars.

[0022] In some modified embodiments of this application, the cross-sectional dimension of the wrapping layer near the rebar cage is larger than its cross-sectional dimension away from the rebar cage.

[0023] In some modified embodiments of this application, the cross-sectional dimensions of the wrapping layer gradually decrease from its position near the reinforcing cage to its position away from the reinforcing cage.

[0024] Compared to existing technologies, the building foundation structure provided in this application connects multiple steel cages together to form an integral structure through connecting bars. By fixing the connecting bars to the bearing medium through a wrapping layer, the entire building foundation structure is fixed to the bearing medium. This avoids the situation where the steel cage is lifted up by the large pressure of the concrete pouring out from the guide pipe when the concrete is poured to the bottom of the steel cage. Attached Figure Description

[0025] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0026] Figure 1 A schematic top view of a building foundation structure is shown.

[0027] Figure 2 A schematic diagram of a partial structure of a building foundation is shown.

[0028] Figure 3 A schematic top view of a steel cage for a building foundation structure is shown.

[0029] Figure 4 The diagram schematically shows a front view of the connection between the steel cage and the connecting bars of a building foundation structure.

[0030] Explanation of icon numbers:

[0031] 1. Reinforcing cage; 2. Connector; 21. Connecting bar; 22. Wrapping layer; 4. Vertical bar; 5. Inner reinforcing ring; 6. Fixing ring; 7. Outer reinforcing ring; 8. Trench. Detailed Implementation

[0032] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0033] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains.

[0034] A cast-in-place pile is a type of pile constructed by drilling a hole in place and then pouring in concrete or reinforced concrete. Common types include bored cast-in-place piles and driven cast-in-place piles. Among them, bored cast-in-place pile construction technology is a concrete technology with low construction costs, simple operation, and no vibration, noise, or soil displacement effect. Currently, bored cast-in-place pile construction technology has been widely used in the field of building construction.

[0035] The construction process for bored piles is as follows: determining the pile location, drilling, cleaning the hole, lowering the reinforcing cage, and pouring concrete. During construction, when the concrete reaches the bottom of the reinforcing cage, the upward pressure from the concrete flowing out of the guide pipe can cause the reinforcing cage to float. If this happens, pouring must be stopped immediately, and the elevation readjusted, which will affect the construction progress.

[0036] To solve the above-mentioned technical problems, this application provides a building foundation structure that can prevent the steel cage from floating up due to the large pressure of the concrete pouring out of the guide pipe when the concrete is poured to the bottom of the steel cage.

[0037] Example 1

[0038] like Figure 1 and Figure 2As shown, a building foundation structure includes a steel cage 1 and a connector 2. Multiple steel cages 1 are provided. The connector 2 is connected between two adjacent steel cages 1 to connect multiple steel cages 1 to form an integral structure. The connector 2 includes a connecting bar 21 and a wrapping layer 22. The two ends of the connecting bar 21 are fixedly connected to two adjacent steel cages 1 respectively. The wrapping layer 22 is connected to the connecting bar 21 to fix the connecting bar 21 to the bearing medium.

[0039] A reinforcing cage 1 is a cylindrical (or other shaped) steel reinforcement skeleton, which can be prefabricated by welding, binding, or mechanical connection of longitudinal main bars (vertical bars 4), stirrups, and reinforcing bars (outer reinforcing rings 7 or inner reinforcing rings 5). It is the core load-bearing component in concrete structures (especially pile foundations, piers, columns, etc.), and its main functions are to withstand tensile and bending moments; to compensate for the low tensile strength of concrete, improve the integrity and ductility of the structure; to prevent sudden fracture under stress; to confine the concrete; to prevent excessive crack propagation; to ensure the geometric shape of the structure; and to maintain the design cross-section during concrete pouring. In cast-in-place pile construction, the reinforcing cage 1 is hoisted and placed into the pre-drilled pile hole, and then concrete is poured into the hole to finally form a reinforced concrete pile. The reinforcing cage 1 can be welded together from equally spaced longitudinal main bars, spiral stirrups, and reinforcing bars placed at certain intervals (usually 2-3 meters). It has a simple structure, is the most widely used, and is suitable for pile foundations with uniform stress, resembling a cylindrical "cage." The diameter or reinforcement amount of the reinforcing cage 1 can vary along its length. For example, variable-diameter cages are used for piles with varying diameters (such as expanded-base piles), and more or thicker steel bars are placed in areas with higher stress (such as the upper part), while the reinforcement in the lower part is reduced, in order to optimize the use of materials.

[0040] The connector 2 is a device used to connect two adjacent reinforcing cages 1 and link them to form an integral structure. Its core function is not only to connect the reinforcing cages 1, but more importantly, to fix the entire reinforcing cage 1 to the bearing medium through its structure to resist the buoyancy force generated during concrete pouring. The connecting bar 21, as the main force-transmitting component, is fixedly connected (e.g., by welding or mechanical connection) to the two adjacent reinforcing cages 1 at both ends. The wrapping layer 22 is connected to the connecting bar 21, and its function is to fix the connecting bar 21 to the bearing medium. The connecting bar 21 then transmits force to the reinforcing cage 1, preventing it from floating. The bearing medium can be the soil around the pile, the foundation, etc. The connector 2 is used to solve the problem of the reinforcing cage 1 floating during bored pile construction. It increases the anti-buoyancy stability by forming an anchored integral structure. The wrapping layer 22 or the connector 2 can be designed with a mechanical anchoring structure (such as barbs, anchor plates, expansion sleeves, threaded ends). After being inserted into the soil or concrete, it provides pull-out resistance through mechanical interlocking, similar to the anchoring method of soil nails or anchor rods. The wrapping layer 22 can be a material that can bond with the surrounding medium with high strength (such as concrete, chemical grout, epoxy coating, chemical anchoring adhesive), which anchors the connecting bar 21 in the medium by the bonding force between the materials. It can also combine mechanical and adhesive anchoring methods to provide higher reliability, such as a barbed metal rod wrapped in concrete.

[0041] The bearing medium is the surrounding material or structure that provides effective anchoring force and reaction force to the "wrapping layer 22" of the connector 2. It is the mechanical fulcrum that fixes the reinforcing cage 1 as a whole and prevents it from floating. For example, the bearing medium can be the stable soil around the pile or the foundation, referring to the original soil or rock layer around the pile hole. The wrapping layer 22 is anchored in the soil, relying on the lateral friction and end bearing force of the soil to provide anchorage.

[0042] Compared with the prior art, the building foundation structure provided in this application connects multiple steel cages 1 together to form an integral structure through connecting bars 21, and fixes the connecting bars 21 to the bearing medium through the wrapping layer 22, thereby fixing the entire building foundation structure to the bearing medium. This avoids the situation where the steel cage 1 is lifted up by the large pressure of the concrete pouring out from the guide pipe when the concrete is poured to the bottom of the steel cage 1.

[0043] like Figure 2As shown, in some modified embodiments of this application, the wrapping layer 22 has a hardening material for anchoring the connecting ribs 21 to the load-bearing medium. The wrapping layer 22 can be a functional structure containing a hardening cementitious or chemical material, possessing "hardening" capability. This means that it may initially be in a fluid, paste, or permeable state, undergoing a physical or chemical reaction under specific conditions (such as contact with water, a curing agent, or the passage of time) to eventually transform into a hard solid. Through the hardening process, the flexible or rigid "connecting ribs 21" can be firmly anchored to the surrounding "load-bearing medium," forming a high-strength bond. For example, the wrapping layer 22 can be a fast-hardening cement-based grout, a mixture of special cement, fine aggregate, expanding agent, and accelerator, pre-filled into the cavity of the wrapping layer 22 in the factory, and activated on-site by injecting clean water or a special liquid through a grouting pipe, resulting in rapid hardening (from minutes to hours). The wrapping layer 22 can also be self-expanding concrete, a micro-concrete with controllable expansion properties, which absorbs moisture and expands after filling, generating prestress and tightly filling gaps.

[0044] For example, in use, the location of the pile holes is first determined, and then a trench 8 is opened between two adjacent pile holes. Pre-embedded reinforcing bars (connecting bars 21) are embedded in the trench 8, extending into both pile holes. Concrete (the hardening material of the wrapping layer 22) is then poured in, forming the wrapping layer 22 on the outside of the connecting bars 21. Furthermore, the trench 8 is opened and the concrete is poured in the trench 8 before the pile holes are opened to facilitate the setting of the concrete in the trench 8.

[0045] like Figure 2As shown, in some modified embodiments of this application, the wrapping layer 22 covers the outer periphery of the connecting bar 21. The wrapping layer 22 can be in the form of a concentric cylinder or similar shape covering the outside of the connecting bar 21, forming a composite structure of "reinforcing bar + sleeve or coating". For example, the wrapping layer 22 can be a pre-filled sleeve, in which a hollow rigid or semi-rigid sleeve (such as a metal corrugated pipe) is pre-fitted onto the connecting bar 21, and the inside is pre-filled with dry fast-hardening cement-based powder or chemical slurry components. After being placed into the trench 8, water or an activator is injected through the grouting hole to mix and harden the internal materials, causing volume expansion and tightly bonding the sleeve to the surrounding medium (mud / soil). The wrapping layer 22 can also be a multi-layer composite coating, that is, a functional coating is directly applied to the surface of the connecting bar 21. The coating itself is a multi-layer structure: the inner layer of the coating is an adhesive layer to ensure bonding with the reinforcing bar; the middle layer of the coating is a main layer containing hardening material, such as a polymer matrix + curing agent. The outer layer of the coating is a protective or controlled-release layer that controls the timing of the hardening reaction. Once the predetermined position is reached, the protective layer is destroyed (e.g., by water dissolution or pressure rupture), exposing the middle layer material and initiating the hardening reaction, thus bonding with the surrounding medium. The circumferential cover ensures maximum contact area between the connecting rib 21 and the hardened material, resulting in more uniform force transmission and preventing slippage. The hardened wrapping layer 22 expands in volume or is thicker than the connecting rib 21, forming a "miniature anchor plate" that significantly improves strength. The circumferential cover allows the anchoring force to diffuse evenly in all directions, effectively utilizing the space within the trench 8.

[0046] like Figure 2 and Figure 3 As shown, in some modified embodiments of this application, the reinforcing cage 1 has a fixing ring 6, which is fixedly connected to the ends of the connecting reinforcement 21. The fixing ring 6 is a ring-shaped or U-shaped metal component pre-welded or tied to the body of the reinforcing cage 1 (e.g., at the intersection of longitudinal main reinforcement or stiffeners), serving as a mechanical interface or connecting seat between the connecting reinforcement 21 and the reinforcing cage 1. The fixing ring 6 can be a simple ring (made by bending a reinforcing bar), a threaded sleeve or connecting seat, or a U-shaped buckle for easy and quick on-site installation. The fixing ring 6 can provide standardized connection points: pre-setting the fixing ring 6 on the reinforcing cage 1 ensures precise and uniform installation of the connecting reinforcement 21, facilitating construction and quality control. The fixing ring 6 can be welded to the main reinforcement or stiffeners of the reinforcing cage 1, ensuring connection strength. The fixing ring 6 can transfer the concentrated force of the connecting reinforcement 21 to multiple main reinforcements of the reinforcing cage 1, avoiding excessive local stress.

[0047] like Figure 2 and Figure 3As shown, in some modified embodiments of this application, the reinforcing cage 1 further includes vertical bars 4 and outer reinforcing rings 7, with multiple vertical bars 4 distributed in a ring shape; the outer reinforcing rings 7 are fixedly connected to the outside of the multiple vertical bars 4 to connect the multiple vertical bars 4 into a whole, and the fixing ring 6 is fixedly connected to the outer reinforcing rings 7.

[0048] The outer reinforcing ring 7 consists of one or more ring-shaped steel bars (or structural steel) fixedly connected to the outside of all vertical reinforcing bars 4. The outer reinforcing ring 7 can tighten and position the dispersed vertical reinforcing bars 4, forming a stable circular cross-section, bearing circumferential stress, constraining the concrete, and serving as the main force transmission platform, distributing the force from the "fixed ring 6" to all vertical reinforcing bars 4. Specifically, the outer reinforcing ring 7 integrates the potentially loose group of vertical reinforcing bars 4 into a more rigid overall frame, significantly improving the deformation resistance of the reinforcing cage 1 during hoisting and lowering. When the connecting bar 21 is subjected to force (such as buoyancy), the force is efficiently and evenly distributed through the fixed ring 6, the outer reinforcing ring 7, and all vertical reinforcing bars 4, avoiding stress concentration on a single or a few vertical reinforcing bars 4, and preventing local yielding or fracture. Setting the fixed ring 6 on the outer reinforcing ring 7 is equivalent to establishing a unified and robust connecting deck, making the installation position of the connecting piece 2 precise and the force clearly defined, facilitating industrial production and on-site assembly.

[0049] like Figure 4 As shown, in some modified embodiments of this application, the fixing ring 6 is welded to the top surface of the outer reinforcing ring 7. The top surface clearly indicates the installation position of the fixing ring 6 relative to the outer reinforcing ring 7, i.e., on the upper edge or upper surface of the ring, rather than the side or lower surface. The connection point is located on the top surface of the outer reinforcing ring 7, allowing workers to clearly see the connection point during connection operations at the orifice, making operations easier, whether it's thread tightening, pin insertion, or welding reinforcement. For example, during welding, the embedded reinforcing bar (connecting bar 21) can overlap the top surface of the fixing ring 6, increasing the welding surface and enhancing the connection strength.

[0050] like Figure 2 and Figure 3As shown, in some modified embodiments of this application, the reinforcing cage 1 further includes an inner reinforcing ring 5, which is fixedly connected to the inner side of multiple vertical reinforcing bars 4. The inner reinforcing ring 5 is one or more ring-shaped reinforcing bars (or structural steel), fixedly connected to the inner side of all vertical reinforcing bars 4, and works together with the previously mentioned outer reinforcing ring 7 to fix the vertical reinforcing bars 4. The inner reinforcing ring 5 can be fixed to the inner intersection of the vertical reinforcing bars 4 by welding or binding. The addition of the inner reinforcing ring 5 upgrades the circumferential structure of the reinforcing cage 1 from "single-sided reinforcement" to a high-performance frame of "internal and external coordination and two-way constraint". Its function is as follows: the outer reinforcing ring 7 tightens the vertical reinforcing bars 4 from the outside, and the inner reinforcing ring 5 supports the vertical reinforcing bars 4 from the inside. The two work together to firmly fix the vertical reinforcing bars 4 in the designed position. For example, during the hoisting process, the reinforcing cage 1 will deflect due to its own weight. The double-ring frame formed by the inner and outer reinforcing rings 7 significantly improves its bending stiffness, reduces deformation, and prevents the vertical reinforcing bars 4 from bending or misaligning. When passing through complex strata or irregular borehole walls, the reinforcing cage 1 may be subjected to lateral compressive forces. The inner and outer ring structure can better resist this asymmetric load and maintain the roundness of the cross-section. The lateral pressure during concrete pouring may also cause the reinforcing cage 1 to expand outward. The inner reinforcing ring 5 provides an inward reaction force, working together with the outer reinforcing ring 7 to resist deformation. In addition, since the fixing ring 6 is welded to the outer reinforcing ring 7, when subjected to tensile force, the outer reinforcing ring 7 will experience local stress concentration. The inner reinforcing ring 5 is linked to the outer reinforcing ring 7 through the vertical reinforcing bars 4, which is equivalent to providing internal tie rod support for the outer reinforcing ring 7, helping to distribute the load and reduce the bending deformation of the outer reinforcing ring 7.

[0051] like Figure 4 As shown, in some modified embodiments of this application, multiple inner reinforcing rings 5 ​​and multiple outer reinforcing rings 7 are staggered along the extension direction of the vertical reinforcing bars 4. The reinforcing cage 1 includes a number of vertical reinforcing bars 4 extending in the height direction, and inner reinforcing rings 5 ​​and outer reinforcing rings 7 arranged in a ring shape along the height direction. The inner reinforcing rings 5 ​​are connected to a number of vertical reinforcing bars 4 from the inside, and the outer reinforcing rings 7 are connected to a number of vertical reinforcing bars 4 from the outside. The inner reinforcing rings 5 ​​and outer reinforcing rings 7 are arranged alternately.

[0052] A fixing ring 6 is also fitted onto the reinforcing cage 1. The fixing ring 6 overlaps the outer ring reinforcement, meaning that the inner diameter of the fixing ring 6 is larger than the inner diameter of the outer ring reinforcement and smaller than the outer diameter of the outer ring reinforcement. The "alternating distribution" refers to the inner reinforcement ring 5 and the outer reinforcement ring 7 not being on the same horizontal plane, but rather alternating and staggered along the longitudinal direction of the pile (the extension direction of the vertical reinforcement 4). From a longitudinal section, the structure appears as: outer reinforcement ring 7 → (a distance) → inner reinforcement ring 5 → (a distance) → outer reinforcement ring 7 → ..., with the inner and outer rings staggered in height, forming a zigzag or spirally staggered circumferential support network. If the inner and outer reinforcement rings 7 are aligned and welded at the same height, a "rigid ring band" will be formed in this area, and the two ring bands... The four vertical ribs between the rigid rings are relatively "soft," and during hoisting or under stress, these "soft segments" are prone to local bending or buckling. By staggering the distribution, the inner and outer rings are dispersed longitudinally, effectively increasing the number of circumferential constraint points. This allows the four vertical ribs to receive more uniform lateral support along their entire length, effectively suppressing instability caused by excessive slenderness ratio. Concentrating all weld points on the same plane would create a stress concentration zone, making the welds prone to fatigue or cracking, especially under bending moments. Distributing the welds and constraint points to multiple different heights allows for a more uniform stress distribution along the longitudinal direction, reducing the peak stress at individual sections and improving the structure's fatigue life and safety.

[0053] like Figure 1 and Figure 2 As shown, in some modified embodiments of this application, the cross-sectional dimension of the wrapping layer 22 near the rebar cage 1 is larger than its cross-sectional dimension away from the rebar cage 1. That is, the cross-sectional dimension near the end of the rebar cage 1 is larger (e.g., larger diameter), and the cross-sectional dimension away from the end of the rebar cage 1 (extending towards the center of the hole or another rebar cage 1) is smaller. The overall structure can be a tapered, trapezoidal, or stepped variable cross-section structure, similar to a double-headed hammer or double-headed gun, wider and thicker at both ends and thinner and narrower in the middle, expanding the cross-section in critical stress areas to improve load-bearing capacity. When the connecting bar 21 is subjected to buoyancy (tension), the force is transmitted to the surrounding medium through the wrapping layer 22. Under a uniform cross-section, stress is concentrated at the root of the interface between the connecting bar 21 and the wrapping layer 22, which can easily lead to "pull-out" or "shear failure". The large near-end dimensions provide a larger bearing area and lateral friction length at the "root" where the stress is greatest (near the steel cage 1 / fixing ring 6). The large cross-section disperses the concentrated tensile force to a wider range of surrounding media, significantly reducing the stress peak per unit area and preventing local crushing or slippage, thereby greatly improving the overall bearing capacity and durability of the anchoring system.

[0054] like Figure 1 and Figure 2As shown, in some modified embodiments of this application, the cross-sectional dimensions of the wrapping layer 22 gradually decrease from its position near the reinforcing cage 1 to its position away from the reinforcing cage 1. The shape of the wrapping layer 22 can be a continuous frustum (truncated cone) or a similar streamlined structure, smoothly transitioning from the large-diameter end near the reinforcing cage 1 to the small-diameter end away from the reinforcing cage 1. This gradually decreasing conical structure allows the force flow (tensile force) to be smoothly and continuously transferred from the large cross-section to the small cross-section, avoiding high stress at abrupt points.

[0055] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A building foundation structure, characterized in that, include: A steel reinforcement cage (1), wherein multiple steel reinforcement cages (1) are provided; Connector (2), the connector (2) is connected between two adjacent steel cages (1) and is used to connect multiple steel cages (1) to form an integral structure; The connector (2) includes: Connecting bar (21), the two ends of the connecting bar (21) are respectively fixedly connected to two adjacent steel cages (1); A wrapping layer (22) is connected to a connecting rib (21) for fixing the connecting rib (21) to the bearing medium.

2. The building foundation structure according to claim 1, characterized in that, The wrapping layer (22) has a hardening material for anchoring the connecting rib (21) to the bearing medium.

3. The building foundation structure according to claim 1, characterized in that, The wrapping layer (22) covers the outer periphery of the connecting rib (21).

4. The building foundation structure according to claim 1, characterized in that, The steel cage (1) has a fixing ring (6), and the fixing ring (6) is fixedly connected to the end of the connecting bar (21).

5. The building foundation structure according to claim 4, characterized in that, The steel cage (1) also includes: Vertical ribs (4), and multiple vertical ribs (4) are distributed in a ring; The outer reinforcing ring (7) is fixedly connected to the outside of the plurality of vertical reinforcing bars (4) to connect the plurality of vertical reinforcing bars (4) into a whole. The fixing ring (6) is fixedly connected to the outer reinforcing ring (7).

6. The building foundation structure according to claim 5, characterized in that, The fixing ring (6) is welded to the top surface of the outer reinforcing ring (7).

7. The building foundation structure according to claim 5, characterized in that, The steel cage (1) also includes: Inner reinforcing ring (5), which is fixedly connected to the inner side of the plurality of vertical reinforcing bars (4).

8. The building foundation structure according to claim 7, characterized in that, The multiple inner reinforcing rings (5) and the multiple outer reinforcing rings (7) are staggered along the extension direction of the vertical reinforcing bar (4).

9. The building foundation structure according to claim 2, characterized in that, The cross-sectional dimension of the wrapping layer (22) near the steel cage (1) is larger than its cross-sectional dimension away from the steel cage (1).

10. The building foundation structure according to claim 9, characterized in that, The cross-sectional dimensions of the wrapping layer (22) gradually decrease from its position near the steel cage (1) to its position away from the steel cage (1).

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