Foundation structural member and construction method for modifying foundation structure using dismantled box beam

Abstract

The application provides a foundation structure component and a construction method for modifying a foundation structure by using a removed box beam. The foundation structure component is prepared by processing the removed box beam, and comprises a horizontal plate, a first vertical plate and a second vertical plate. The first vertical plate and the second vertical plate are formed on the first large surface or the second large surface, are oppositely arranged along the arrangement direction of the first vertical plate and the second vertical plate, and are formed between the horizontal plate and the first vertical plate. A plurality of first reinforcing ribs are formed between the horizontal plate and the first vertical plate, a plurality of second reinforcing ribs are formed between the horizontal plate and the second vertical plate, and the plurality of first reinforcing ribs and the plurality of second reinforcing ribs are respectively arranged along the length direction of the horizontal plate. The application can realize secondary utilization of the removed box beam, conforms to the green environmental protection concept, and the foundation structure component is stable in structure, can effectively diffuse stress, and can control settlement.

Description

Technical Field

[0001] This invention relates to the field of recycling technology for discarded bridges, specifically to a foundation structure component and a construction method for converting a foundation structure using dismantled box girder beams. Background Technology

[0002] With the accelerated upgrading and renovation of my country's transportation infrastructure, the scale of existing bridge demolition is expanding, highlighting the growing problem of concrete structure disposal and placing higher demands on environmental protection and resource recycling. Currently, the common practice for dismantled bridge components is to mechanically crush them and dispose of them as construction waste. This method not only fails to fully utilize the remaining mechanical properties of waste building materials but also wastes reusable resources, exacerbates ecological and environmental pressures, and contradicts the concept of green and low-carbon development. Against this backdrop, promoting the large-segment and integrated utilization of demolished structures has become an important way to improve resource utilization efficiency, reduce the cost of new construction projects, and achieve high-value utilization of solid waste.

[0003] In infrastructure construction, soft soil foundations are a widespread and pressing engineering challenge. To ensure roadbed stability and control post-construction settlement, the current methods for shallow soft soil foundations often involve excavation and replacement, while deep soft soil foundations are typically treated using methods such as cement mixing piles, prestressed pipe piles, and suspended piles. However, these traditional methods generally suffer from high engineering costs and significant material consumption, especially when dealing with deep soft soil conditions, where their economic viability and technical rationality are often challenged. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the existing technology, it is desirable to provide a foundation structure component and a construction method for modifying the foundation structure by dismantling box girders, which can realize the secondary use of the dismantled box girders, conform to the concept of green environmental protection, and at the same time, the foundation structure component is structurally stable, can effectively diffuse stress, and control settlement.

[0005] In a first aspect, the present invention provides a foundation structure component, which is fabricated using a dismantled box girder, and the foundation structure component includes:

[0006] The horizontal plate includes a first large surface and a second large surface that are opposite each other, and the horizontal plate also includes a first side surface, a second side surface, a third side surface and a fourth side surface formed between the first large surface and the second large surface. The first vertical plate and the second vertical plate are formed alternately on the first large surface or the second large surface. The first vertical plate and the second vertical plate are arranged opposite to each other. Along the arrangement direction of the first vertical plate and the second vertical plate, the horizontal plate protrudes from the first vertical plate and the second vertical plate. The horizontal plate, the first vertical plate and the second vertical plate are all the structures of the dismantled box girder. Multiple first reinforcing ribs are formed between the horizontal plate and the first vertical plate, and multiple second reinforcing ribs are formed between the horizontal plate and the second vertical plate. The multiple first reinforcing ribs and the multiple second reinforcing ribs are spaced apart along the length direction of the horizontal plate.

[0007] As an optional solution, multiple first reinforcing ribs are provided on each of the opposite sides of the first vertical plate, and multiple second reinforcing ribs are provided on each of the opposite sides of the second vertical plate.

[0008] As an optional solution, each of the first reinforcing ribs and each of the second reinforcing ribs is a reinforced concrete structure, with exposed steel bar ends formed at both ends of the reinforced concrete structure. The exposed steel bar ends extend into the reserved holes on the horizontal plate, the first vertical plate and the second vertical plate, and are fixed by pouring concrete.

[0009] As an optional solution, a first extension area is formed on the first vertical plate, the first extension area being located at the end of the first vertical plate away from the horizontal plate, and a second extension area is formed on the second vertical plate, the second extension area being located at the end of the second vertical plate away from the horizontal plate. The first extension area is provided to extend from the first vertical plate in a direction away from the first vertical plate; The second extension area is provided to extend from the second vertical plate in a direction away from the second vertical plate; The first extension area and the second extension area are arranged opposite to each other, and there is a gap between the first extension area and the second extension area; The opposing sides of the first extension area and the second extension area include the adjacent first area and the second area. The first area is the area of ​​the first extension area and the second extension area that is close to the horizontal plate in the height direction. The second area is the area of ​​the first extension area and the second extension area that is far away from the horizontal plate in the height direction. The side of the first area is an inclined surface, and the side of the second area is parallel to the first vertical plate or the second vertical plate.

[0010] As an optional solution, multiple connecting holes are spaced apart on the first, second, third, and fourth sides of the horizontal plate. These connecting holes are used to connect multiple foundation structural components in the horizontal and vertical directions.

[0011] Secondly, the present invention provides a construction method for modifying a foundation structure by dismantling a box girder, comprising the foundation structure components of the first aspect, wherein the construction method for modifying a foundation structure by dismantling a box girder includes: The dismantled box girder is pre-treated to obtain the foundation structure components; Multiple foundation structural components are connected sequentially using steel connectors through pre-reserved connection holes, so that the multiple foundation structural components are connected and arranged horizontally and vertically to form a foundation raft slab; The foundation raft slab is transported to the construction site and pressed into the soft soil foundation using static or vibratory equipment. A reinforced concrete panel is poured on the foundation raft slab to form a continuous concrete panel on the surface of the foundation raft slab.

[0012] As an optional solution, the dismantled box girder will undergo pretreatment, including: The dismantled box girder is cut into sections, and part of the bottom plate is removed to obtain the horizontal plate, the first vertical plate, and the second vertical plate of the foundation components. Multiple connection holes are made on the first, second, third, and fourth sides of the horizontal plate; Multiple first reinforcing ribs are provided between the horizontal plate and the first vertical plate, and multiple second reinforcing ribs are provided between the horizontal plate and the second vertical plate to obtain the foundation structure component.

[0013] As an optional solution, the foundation raft slab is transported to the construction site and pressed into the soft soil foundation using static or vibratory equipment. Construction methods include: A steel mesh is installed on the surface of the foundation raft slab, and the steel mesh is fixedly connected to the surface of the foundation raft slab.

[0014] As an optional solution, during the process of connecting multiple foundation structural components sequentially using pre-reserved connection holes via steel connectors, the steel connectors form a protruding area on the outer edge of the foundation raft slab for binding the reinforcing mesh and the protruding area.

[0015] Thirdly, the present invention provides an application of the foundation structure component of the first aspect in the construction of soft soil foundation.

[0016] The foundation structure component provided by this invention is fabricated using dismantled box beams, achieving a high-value combination of construction solid waste and soft soil treatment. This saves on costs associated with building material procurement, earthwork transportation, and waste disposal, significantly reducing project costs. Furthermore, the foundation structure component includes a horizontal plate, a first vertical plate, and a second vertical plate, providing high vertical and lateral stiffness. The composite foundation can effectively diffuse stress and control settlement. A first reinforcing rib is provided between the horizontal plate and the first vertical plate, and a second reinforcing rib is provided between the horizontal plate and the second vertical plate, further improving the structural strength and stability of the entire foundation structure component. With this foundation structure component, the on-site assembly degree is high during foundation construction, and the quality is controllable, which is conducive to improving production and processing efficiency. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of a foundation structure component according to an embodiment of this application; Figure 2 This is a schematic diagram of another foundation structure component according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the first and second reinforcing ribs in a foundation structure component according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a construction method for modifying a foundation structure by dismantling a box girder, as described in an embodiment of this application. Figure 5 This is a schematic diagram of the structure after the box girder is cut into sections in a construction method for modifying a foundation structure by dismantling a box girder, as described in an embodiment of this application. Figure 6 This is a schematic diagram of a construction method for modifying a foundation structure by dismantling a box girder, according to an embodiment of this application, in which a connection hole is opened on the side of the box girder; Figure 7 This is a schematic diagram of the structure after steel mesh is laid on the foundation raft slab in a construction method for modifying a foundation structure by removing a box girder, which is an embodiment of this application. Figure 8 This is a schematic diagram of the structure after concrete is poured on the foundation raft slab in a construction method for modifying a foundation structure by dismantling a box girder, which is an embodiment of this application.

[0018] In the picture, 10. Foundation structural components; 100. Box beams; 1. Horizontal plate, S1. First large surface, S2. Second large surface, 2. First vertical plate, 3. Second vertical plate, 4. First reinforcing rib, 5. Second reinforcing rib, 6. First extension area, 7. Second extension area, A1. Inclined surface, 8. Connecting hole, 9. Steel mesh. Detailed Implementation

[0019] The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present application will now be described in detail with reference to embodiments.

[0020] To address the aforementioned problems, embodiments of this application provide a foundation structure component 10, which is fabricated using dismantled box beams. Figure 1 and Figure 2 As shown, the foundation structure component 10 includes: The horizontal plate 1 includes a first large surface S1 and a second large surface S2 that are opposite each other. The horizontal plate 1 also includes a first side surface, a second side surface, a third side surface and a fourth side surface formed between the first large surface S1 and the second large surface S2. The first vertical plate 2 and the second vertical plate 3 are spaced apart and formed on the first large surface S1 or the second large surface S2. The first vertical plate 2 and the second vertical plate 3 are arranged opposite to each other, and along the arrangement direction of the first vertical plate 2 and the second vertical plate 3, the horizontal plate 1 protrudes from the first vertical plate 2 and the second vertical plate 3. The horizontal plate 1, the first vertical plate 2 and the second vertical plate 3 are all the structures of the dismantled box girder. Multiple first reinforcing ribs 4 are formed between the horizontal plate 1 and the first vertical plate 2, and multiple second reinforcing ribs 5 are formed between the horizontal plate 1 and the second vertical plate 3. The multiple first reinforcing ribs 4 and the multiple second reinforcing ribs 5 are each spaced apart along the length direction of the horizontal plate 1.

[0021] It should be noted that the dismantled box girder refers to a discarded, hollow box girder. In this embodiment, the foundation structure component prepared by processing the dismantled box girder is usually formed by non-destructively cutting or segmenting the dismantled box girder into multiple segments of suitable length according to actual construction needs and hoisting and transportation capabilities, and removing part or all of the bottom plate of the box girder to form a foundation structure component with a "π" shaped cross-section.

[0022] It is understandable that the horizontal plate 1, the first vertical plate 2, and the second vertical plate 3 are part of the box girder's structure. Since the box girder is hollow, the first vertical plate 2 and the second vertical plate 3 are spaced apart. This facilitates good integration with the soil when the foundation structural components are pressed into the foundation, forming a stable structure. Furthermore, along the arrangement direction of the first vertical plate 2 and the second vertical plate 3, the horizontal plate 1 protrudes from the first vertical plate 2 and the second vertical plate 3. During the pressing process, the protruding part of the horizontal plate 1 integrates with the soil, further enhancing the stability of the foundation. Multiple first reinforcing ribs 4 are formed between the horizontal plate 1 and the first vertical plate 2, and multiple second reinforcing ribs 5 are formed between the horizontal plate 1 and the second vertical plate 3. The first reinforcing ribs 4 and 5 are located at the junction of the horizontal plate 1 and the first vertical plates 2 and 3. One end of the first reinforcing rib 4 is connected to the horizontal plate 1, and the other end is connected to the first vertical plate 2. One end of the second reinforcing rib 5 is connected to the horizontal plate 1, and the other end is connected to the second vertical plate 3. This enhances the structural strength of the entire foundation structural components.

[0023] The foundation structure component of this application solves the problems of high material consumption and easy settlement after foundation construction in existing foundation construction. This application's embodiment utilizes dismantled box beams for processing, achieving a high-value combination of construction solid waste and soft soil treatment, saving costs in three categories: building material procurement, earthwork transportation, and waste disposal, significantly reducing project costs. Furthermore, the foundation structure component includes a horizontal plate 1, a first vertical plate 2, and a second vertical plate 3, providing high vertical and lateral stiffness. The composite foundation can effectively diffuse stress and control settlement. A first reinforcing rib 4 is provided between the horizontal plate 1 and the first vertical plate 2, and a second reinforcing rib 5 is provided between the horizontal plate 1 and the second vertical plate 3, further improving the structural strength and stability of the entire foundation structure component. Through this foundation structure component, the degree of on-site assembly during foundation construction is high, quality is controllable, and production efficiency is improved.

[0024] As a feasible approach, such as Figure 2 As shown, the first vertical plate 2 has multiple first reinforcing ribs 4 on each of its opposite sides, and the second vertical plate 3 has multiple second reinforcing ribs 5 on each of its opposite sides.

[0025] This implementation method is beneficial for further improving the structural stability of foundation structural components, and for reliably distributing loads and improving foundation stability during foundation construction.

[0026] In some embodiments, such as Figure 3 As shown, each of the first reinforcing ribs 4 and each of the second reinforcing ribs 5 is a reinforced concrete structure. Both ends of the reinforced concrete structure have exposed steel bar ends, which extend into the reserved holes on the horizontal plate 1, the first vertical plate 2 and the second vertical plate 3, and are fixed by pouring concrete.

[0027] It is understandable that during the dismantling of the box girder, pre-drilled holes are made on the horizontal plate 1, the first vertical plate 2, and the second vertical plate 3 to facilitate connection with the first reinforcing rib 4 and the second reinforcing rib 5.

[0028] In actual processing, the exposed steel bar ends of the first reinforcing rib 4 and the second reinforcing rib 5 are welded to the steel bars in the reserved holes on the horizontal plate 1, the first vertical plate 2 and the second vertical plate 3, and then fixed by pouring concrete.

[0029] In this embodiment, the connection method of the first reinforcing rib 4 and the second reinforcing rib 5 is beneficial to improving the structural strength and stability of the entire foundation structure component.

[0030] As an implementation method, a first extension area 6 is formed on the first vertical plate 2, the first extension area 6 is located at the end of the first vertical plate 2 away from the horizontal plate 1, and a second extension area 7 is formed on the second vertical plate 3, the second extension area 7 is located at the end of the second vertical plate 3 away from the horizontal plate 1. The first extension area 6 is provided to extend from the first vertical plate 2 in a direction away from the first vertical plate 2; The second extension area 7 is provided to extend from the second vertical plate 3 in a direction away from the second vertical plate 3; The first extension area 6 and the second extension area 7 are arranged opposite to each other, and there is a gap between the first extension area 6 and the second extension area 7; The opposite sides of the first extension area 6 and the second extension area 7 each include the first region and the second region adjacent to each other. The first region is the area of ​​the first extension area 6 and the second extension area 7 that is close to the horizontal plate 1 in the height direction. The second region is the area of ​​the first extension area 6 and the second extension area 7 that is far away from the horizontal plate 1 in the height direction. The side of the first region is an inclined surface A1. The side of the second region is parallel to the first vertical plate 2 or the second vertical plate 3.

[0031] In this embodiment, the first extension zone 6 and the second extension zone 7 can be understood as the remaining parts after the bottom plate of the box girder is cut. The first extension zone 6 and the second extension zone 7 in this embodiment are beneficial to increasing the contact area between the foundation structure components and the soil, thereby improving the stability of the foundation structure components. On the other hand, when the foundation structure components are pressed into the soil, the first extension zone 6, the first vertical plate 2, the second extension zone 7, the second vertical plate 3 and the soil form an interlocking structure, which is beneficial to increasing the interaction force between the foundation structure components and the soil, thereby improving the structural stability of the entire foundation and effectively preventing settlement.

[0032] In some embodiments, a plurality of connecting holes 8 are provided at intervals on the first side, second side, third side and fourth side of the horizontal plate 1, and the plurality of connecting holes 8 are used to connect a plurality of foundation structure components in the horizontal and vertical directions.

[0033] Among them, the horizontal direction can be Figure 2 In the X direction, the longitudinal direction can be Figure 2 in the Y direction.

[0034] In this embodiment, the connecting holes 8 on the horizontal plate facilitate the interconnection of multiple foundation structural components, thus making foundation construction easier and forming a stable foundation.

[0035] In summary, the foundation structural components of this application achieve a high-value combination of construction solid waste and soft soil treatment; save on the costs of building material procurement, earthwork transportation, and waste disposal, resulting in a significant reduction in project costs; the "π"-shaped structure provides high vertical and lateral stiffness, and the composite foundation can effectively diffuse stress and control settlement; the high degree of on-site assembly makes quality control easy and shortens the construction period.

[0036] Secondly, embodiments of this application provide a construction method for modifying a foundation structure by dismantling a box girder, such as... Figure 4-8As shown, the construction method for modifying the foundation structure by removing the box girder, including the foundation structural components of the first aspect, includes: S10. Pre-treat the dismantled box girder to obtain the foundation structure components; S20. Multiple foundation structure components are connected sequentially through multiple pre-reserved connection holes 8 using steel connectors, so that the multiple foundation structure components are connected and arranged laterally and longitudinally to form a foundation raft slab. S30. Transport the foundation raft slab to the construction site and press it into the soft soil foundation using static or vibratory equipment. S40, such as Figure 8 As shown, a reinforced concrete panel is poured on the foundation raft slab to form a continuous concrete panel on the surface of the foundation raft slab.

[0037] The above steps only indicate that the construction method includes the above steps, and do not limit the execution order of each step.

[0038] For example, multiple foundation structure components can be transported to the construction site and then assembled longitudinally and transversely. Alternatively, the foundation structure components can be assembled longitudinally and transversely first and then transported to the construction site, depending on the actual construction needs.

[0039] In some embodiments, such as Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, S10, pre-treatment of the dismantled box girder includes: The dismantled box girder is cut into sections, and part of the bottom plate is removed to obtain the horizontal plate 1, the first vertical plate 2, and the second vertical plate 3 of the foundation components; Multiple connecting holes 8 are made on the first, second, third, and fourth sides of the horizontal plate 1; Multiple first reinforcing ribs 4 are provided between the horizontal plate 1 and the first vertical plate 2, and multiple second reinforcing ribs 5 are provided between the horizontal plate 1 and the second vertical plate 3 to obtain the foundation structure component.

[0040] In some other embodiments, S30, after transporting the foundation raft slab to the construction site, it is pressed into the soft soil foundation using static or vibratory equipment. The construction method includes: like Figure 7 As shown, a steel mesh 9 is installed on the surface of the foundation raft slab, and the steel mesh 9 is fixedly connected to the surface of the foundation raft slab.

[0041] It is understandable that a foundation raft slab is a structure formed by assembling multiple foundation structural components in both the horizontal and vertical directions. Installing steel mesh 9 on the foundation raft slab helps to further improve the structural strength and stability of the foundation structural components.

[0042] In a preferred embodiment, during the process of sequentially connecting multiple foundation structural components using multiple pre-reserved connection holes 8 through steel connectors, the steel connectors include steel connectors or reinforcing bars, and the steel connectors have a protruding area formed on the outer edge of the foundation raft slab for binding the reinforcing mesh 9 and the protruding area.

[0043] In this embodiment, the extension area formed by the steel connector on the outer edge of the foundation raft slab is conducive to fixing the steel mesh 9. The steel mesh 9 is tied together with the extension area during the installation process, which is simple to operate and helps to improve the stability of the foundation and avoid settlement.

[0044] In summary, this application utilizes a construction method for modifying foundation structures by dismantling box girders. This method is simple to operate and convenient for on-site construction. Furthermore, by processing the dismantled box girders into foundation structural components, and assembling these components longitudinally and transversely to form an integral foundation raft, the reuse of waste building materials is achieved. At the same time, it can also improve the structural stability of soft soil foundations and prevent settlement.

[0045] Thirdly, embodiments of this application provide an application of a foundation structural component of the first aspect in soft soil foundation construction.

[0046] In the actual foundation construction process, the above-mentioned foundation structure components can be assembled according to the actual construction needs and pressed into the soft soil of the foundation to facilitate subsequent foundation construction and improve the stability of the foundation structure.

[0047] The following specific embodiment illustrates the construction method of the present invention for modifying the foundation structure by dismantling box girder.

[0048] like Figure 1-8 As shown, (1) the old concrete box beams after both ends are removed are cut or segmented without damage, with the best on-site hoisting and transportation capacity and structural stress as the cutting principle; (2) The transverse plate 1 of the segmental box girder has pre-reserved connection holes 8 on all four sides to facilitate the longitudinal and transverse connection of the "π"-shaped foundation structure components in the later stage. (3) Removal of the bottom plate: Use a wire saw to cut off part of the original bottom plate of the box beam to reduce the structural weight and create an opening; (4) Structural reinforcement: A first reinforcing rib 4 is installed between the horizontal plate 1 and the first vertical plate 2, and a second reinforcing rib 5 is installed between the horizontal plate 1 and the second vertical plate 3, thereby forming a "π" shaped foundation structure component; (5) Positioning and pressing: The obtained "π"-shaped foundation structure components are transported to the construction site and pressed into the soft soil foundation using static or vibratory equipment according to the design elevation; (6) Longitudinal and transverse connection: Utilize the reserved holes to install longitudinal and transverse steel connectors in advance to achieve reliable longitudinal and transverse connection, ensuring effective load transfer and diffusion. The steel connectors should be appropriately exposed so as to be welded and tied to the panel steel mesh.

[0049] (7) Top integrated construction: After all foundation structural components are installed and connected, reinforced concrete panels are poured on top of them to form a continuous rigid raft slab, which works together to effectively prevent differential settlement. (8) Subgrade and pavement construction: Conventional filling and pavement structure construction are carried out on the formed composite foundation.

[0050] The embodiments of this application have the following advantages over the prior art: Green and environmentally friendly: Achieving a high-value combination of construction solid waste and soft soil treatment; Significant economic benefits: Savings in three categories of costs: building material procurement, earthwork transportation, and waste disposal, resulting in a significant reduction in project costs; Excellent structural performance: The "π" shaped structure provides high vertical and lateral stiffness, and the composite foundation can effectively diffuse stress and control settlement; Convenient construction: The main components are highly assembled on-site, making quality control easy and shortening the construction period.

[0051] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed.

[0052] Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features without departing from the inventive concept. For example, technical solutions formed by substituting the above-mentioned features with technical features disclosed in this application (but not limited to) that have similar functions.

Claims

1. A foundation structural component, characterized in that, The foundation structure component is fabricated using dismantled box girder beams, and the foundation structure component includes: A horizontal plate, the horizontal plate including a first large surface and a second large surface opposite to each other, the horizontal plate also including a first side surface, a second side surface, a third side surface and a fourth side surface formed between the first large surface and the second large surface; The first vertical plate and the second vertical plate are formed alternately on the first large surface or the second large surface. The first vertical plate and the second vertical plate are arranged opposite to each other. Along the arrangement direction of the first vertical plate and the second vertical plate, the horizontal plate protrudes from the first vertical plate and the second vertical plate. The horizontal plate, the first vertical plate and the second vertical plate are all the structures of the dismantled box beam itself. A plurality of first reinforcing ribs are formed between the horizontal plate and the first vertical plate, and a plurality of second reinforcing ribs are formed between the horizontal plate and the second vertical plate. The plurality of first reinforcing ribs and the plurality of second reinforcing ribs are each spaced apart along the length direction of the horizontal plate.

2. The foundation structure component according to claim 1, characterized in that, The first vertical plate has multiple first reinforcing ribs on each of its opposite sides, and the second vertical plate has multiple second reinforcing ribs on each of its opposite sides.

3. The foundation structure component according to claim 2, characterized in that, Each of the first reinforcing ribs and each of the second reinforcing ribs is a reinforced concrete structure, with exposed steel bar ends formed at both ends of the reinforced concrete structure. The exposed steel bar ends extend into pre-drilled holes in the horizontal plate, the first vertical plate, or the second vertical plate, and are fixed by pouring concrete.

4. The foundation structure component according to claim 1, characterized in that, A first extension area is formed on the first vertical plate, and the first extension area is located at the end of the first vertical plate away from the horizontal plate; a second extension area is formed on the second vertical plate, and the second extension area is located at the end of the second vertical plate away from the horizontal plate. The first extension area is provided to extend from the first vertical plate in a direction away from the first vertical plate; The second extension area is provided to extend from the second vertical plate in a direction away from the second vertical plate; The first extension area and the second extension area are arranged opposite to each other, and there is a gap between the first extension area and the second extension area; The opposing sides of the first extension area and the second extension area each include an adjacent first area and a second area. The first area is the area of ​​the first extension area and the second extension area that is close to the horizontal plate in the height direction. The second area is the area of ​​the first extension area and the second extension area that is far away from the horizontal plate in the height direction. The side of the first area is an inclined surface, and the side of the second area is parallel to the first vertical plate or the second vertical plate.

5. The foundation structure component according to any one of claims 1-4, characterized in that, The first, second, third, and fourth sides of the horizontal plate are each provided with a plurality of connecting holes spaced apart, which are used to connect a plurality of the foundation structure components in the horizontal and vertical directions.

6. A construction method for modifying a foundation structure by dismantling a box girder, characterized in that, Including the foundation structure components as described in any one of claims 1-5, the construction method for modifying the foundation structure by dismantling the box girder includes: The dismantled box girder is pre-treated to obtain the foundation structure component; Multiple foundation structure components are sequentially connected to each other using pre-reserved connection holes and steel connectors, so that the multiple foundation structure components are connected and arranged laterally and longitudinally to form a foundation raft slab; The foundation raft slab is transported to the construction site and pressed into the soft soil foundation using static or vibratory equipment. A reinforced concrete panel is poured on the foundation raft slab to form a continuous concrete panel on the surface of the foundation raft slab.

7. The construction method for modifying a foundation structure by dismantling a box girder according to claim 6, characterized in that, The pretreatment of the box girder to be dismantled includes: The dismantled box girder is cut into sections, and part of the bottom plate is removed to obtain the horizontal plate, the first vertical plate, and the second vertical plate of the foundation component; Multiple connection holes are provided on the first, second, third, and fourth sides of the horizontal plate; A plurality of first reinforcing ribs are provided between the horizontal plate and the first vertical plate, and a plurality of second reinforcing ribs are provided between the horizontal plate and the second vertical plate to obtain the foundation structure component.

8. The construction method for modifying a foundation structure by dismantling a box girder according to claim 6, characterized in that, The construction method includes transporting the foundation raft slab to the construction site and pressing it into the soft soil foundation using static or vibratory equipment. A steel mesh is installed on the surface of the foundation raft slab, and the steel mesh is fixedly connected to the surface of the foundation raft slab.

9. The construction method for modifying a foundation structure by dismantling a box girder according to claim 8, characterized in that, During the process of sequentially connecting multiple foundation structural components using the reserved connection holes via steel connectors, the steel connectors form a protruding area on the outer edge of the foundation raft slab for binding the steel mesh and the protruding area.

10. The application of a foundation structure component according to any one of claims 1-5 in the construction of soft soil foundations.

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