CFG pile structure for reinforcing deep soft soil roadbed
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN UNIV OF TECH
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-14
Smart Images
Figure CN224495084U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building engineering, specifically to a CFG pile structure for reinforcing deep soft soil subgrades with complex geological conditions, low bearing capacity, and low strength. Background Technology
[0002] Traditional soft soil roadbed pile foundations use concrete piles, whose bearing capacity mainly depends on the friction between the pile and the surrounding soil, as well as the end bearing capacity. In areas with deep soft soil layers, the surrounding soil may not provide sufficient friction, and the end bearing capacity of the concrete pile depends on the bearing capacity of the soil layer in contact with the pile tip. If the soft soil layer is deep, this may result in a longer pile design length, leading to excessively high engineering costs. Furthermore, reinforced concrete piles, mainly composed of cement, steel bars, and coarse and fine aggregates, require a long construction time for pile hole drilling, steel bar binding, concrete pouring, and curing, resulting in high costs. Therefore, it is necessary to design a CFG pile structure that improves structural bearing capacity, stability, and settlement resistance. Utility Model Content
[0003] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is how to improve the CFG pile structure to enhance its structural stability. The specific technical solution is as follows:
[0004] A CFG pile structure for reinforcing deep soft soil subgrade includes CFG piles, CFG pile caps, pile cap connecting reinforcement bars, lattice beams, and a cushion layer. There are multiple CFG piles, which are arranged in a grid pattern. Each CFG pile has one CFG pile cap installed on it through the pile cap connecting reinforcement bars. Adjacent CFG pile caps are connected by lattice beams. A cushion layer is laid on top of the CFG pile caps.
[0005] In a preferred embodiment of this utility model, the lower end of the pile cap connecting steel bar is embedded in the CFG pile, and the upper end of the pile cap connecting steel bar is embedded in the CFG pile cap.
[0006] As a preferred embodiment of this utility model, the mattress layer is composed of a rigid mattress layer and a flexible mattress layer.
[0007] As a preferred embodiment of this utility model, the rigid mattress layer includes a plain concrete layer and a reinforced concrete layer, the flexible mattress layer is a graded crushed stone layer, a plain concrete layer is laid on top of the CFG pile cap, a graded crushed stone layer is laid on top of the plain concrete layer, and a reinforced concrete layer is laid on top of the graded crushed stone layer.
[0008] As a preferred embodiment of this utility model, the lattice beam is a reinforced concrete lattice beam.
[0009] As a preferred embodiment of this utility model, the distance between two adjacent CFG piles is 2.5-3 times the diameter of a single CFG pile.
[0010] As a preferred embodiment of this utility model, the raw materials for CFG piles are cement, fly ash and undisturbed soil. Beneficial effects
[0011] (1) The arrangement of multiple CFG piles is a grid pattern of longitudinal and transverse arrangement. By designing a reasonable grid layout of CFG piles, the pile foundations are evenly distributed in the composite foundation, ensuring that the load of the superstructure is evenly transferred to the foundation, maximizing the bearing capacity of a single pile, and improving the overall bearing capacity and stability of the composite foundation.
[0012] (2) One CFG pile cap is installed on each CFG pile by connecting steel bars through the pile cap. Adjacent CFG pile caps are connected by a lattice beam. The lattice beam effectively reduces the settlement difference between piles by strengthening the connection between pile caps and improving the overall rigidity of the pile foundation system. This enhances the anti-settlement capacity of the foundation and ensures the stability of the superstructure.
[0013] (3) A cushion layer is laid on top of the CFG pile cap. The cushion layer consists of a rigid cushion layer and a flexible cushion layer. The rigid cushion layer includes a plain concrete layer and a reinforced concrete layer. The flexible cushion layer is a graded crushed stone layer. The cushion layer provides the best settlement control performance. The rigid cushion layer ensures uniform load distribution and controls large-scale settlement, while the flexible cushion layer can adapt to small settlement differences, slow down load changes, help alleviate the impact of dynamic loads on the pile foundation, improve the overall settlement stability of the foundation, and thus effectively prevent the problem of uneven local settlement.
[0014] (4) The raw materials for CFG piles are cement, fly ash, and original soil, while reinforced concrete piles are mainly composed of cement, steel bars, and coarse and fine aggregates. The composite material of cement and fly ash is relatively inexpensive, and CFG piles use less steel bars. Compared with traditional reinforced concrete piles, this reduces the demand for steel bars, thereby reducing material costs. The construction cycle of CFG piles is usually shorter because its construction process is simpler. It does not require complicated pile hole treatment and concrete pouring processes, as well as human resources, thus reducing overall construction costs. Attached Figure Description
[0015] Figure 1 This is a structural diagram of the present invention in use;
[0016] Figure 2 This is a top-view diagram of the CFG pile grid layout structure of this utility model;
[0017] Figure 3 This is a structural diagram of the present invention;
[0018] Figure 4This is a dimensional diagram showing the CFG pile spacing length and pile diameter of this utility model. Detailed Implementation
[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:
[0020] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0022] like Figures 1-3 As shown, a CFG pile structure for reinforcing deep soft soil subgrade includes CFG piles 1, CFG pile caps 2, pile cap connecting steel bars 3, lattice beams 4, and a cushion layer 5. There are multiple CFG piles 1, which are arranged in a grid pattern. Each CFG pile 1 is fitted with a CFG pile cap 2 through the pile cap connecting steel bars 3. Adjacent CFG pile caps 2 are connected by lattice beams 4. A cushion layer 5 is laid on top of the CFG pile caps 2, covering all CFG pile caps 2. In actual use, the CFG pile structure of this utility model is buried in the subgrade soil 6, and the subgrade 7 is installed on top of the CFG pile structure.
[0023] The multiple CFG piles 1 are arranged in a grid pattern with multiple rows and columns, and the pile foundations are evenly distributed in the composite foundation to ensure that the load of the superstructure is evenly transferred to the foundation.
[0024] The lower end of the pile cap connecting steel bar 3 is embedded in the CFG pile 1, and the upper end of the pile cap connecting steel bar 3 is embedded in the CFG pile cap 2. A CFG pile cap 2 is installed on each CFG pile 1 via the pile cap connecting steel bar 3. Adjacent CFG pile caps 2 are connected by a lattice beam 4. The lattice beam effectively reduces settlement differences between piles by strengthening the connection between pile caps and improving the overall rigidity of the pile foundation system, thus enhancing the foundation's resistance to settlement while ensuring the stability of the superstructure. The lattice beam 4 is a reinforced concrete lattice beam, which connects multiple pile caps through steel bar binding to form a stable, integrated frame structure. This allows the load to be evenly distributed to each pile, controlling the settlement of the pile foundation and providing stable load distribution and settlement control.
[0025] Specifically, the cushion layer 5 consists of a rigid cushion layer and a flexible cushion layer. The rigid cushion layer includes a plain concrete layer 51 and a reinforced concrete layer 52, while the flexible cushion layer is a graded crushed stone layer 53. The plain concrete layer 51 is laid on top of the CFG pile cap 2, the graded crushed stone layer 53 is laid on top of the plain concrete layer 51, and the reinforced concrete layer 52 is laid on top of the graded crushed stone layer 53. The cushion layer 5, combining a rigid cushion layer (plain concrete layer and reinforced concrete layer) with a flexible cushion layer (graded crushed stone layer), provides optimal settlement control performance. The rigid cushion layer ensures uniform load distribution and controls large-scale settlement, while the flexible cushion layer can adapt to small settlement differences, mitigate load changes, help alleviate the impact of dynamic loads on the pile foundation, and improve the overall settlement stability of the foundation, thereby effectively preventing the problem of uneven local settlement.
[0026] like Figure 4 As shown, the distance L between two adjacent CFG piles 1 is 2.5-3 times the diameter D of a single CFG pile. The pile diameter and pile spacing ratio have been optimized to maximize the bearing capacity of a single pile while reducing interference between pile foundations, in order to adapt to soft soil strata with low bearing capacity. The pile bottom has an enlarged foundation.
[0027] Specifically, CFG piles are made from cement, fly ash, and undisturbed soil, while reinforced concrete piles are mainly composed of cement, reinforcing steel, and coarse and fine aggregates. The cement and fly ash composite material is relatively inexpensive. CFG piles require less reinforcing steel compared to traditional reinforced concrete piles, reducing the need for steel reinforcement and thus lowering material costs. The construction cycle for CFG piles is typically shorter because their construction process is simpler, requiring less complex pile hole preparation, concrete pouring, and manpower. In contrast, reinforced concrete piles require a longer construction time for pile hole drilling, steel reinforcement binding, concrete pouring, and curing. Because CFG piles use composite materials such as cement and fly ash, they have better corrosion resistance, making them particularly suitable for deep, soft soil areas. This reduces potential future maintenance costs, while reinforced concrete piles are susceptible to corrosion from moisture and chemicals in moist soft soil environments, requiring regular maintenance and reinforcement, increasing long-term costs.
[0028] The above description is a further detailed explanation of the present utility model in conjunction with specific preferred embodiments. It should not be considered that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the protection scope of the present utility model.
Claims
1. A CFG pile structure for reinforcing deep soft soil subgrades, characterized in that: It includes CFG piles, CFG pile caps, pile cap connecting steel bars, lattice beams and mattress layers. There are multiple CFG piles, which are arranged in a grid pattern. Each CFG pile is equipped with one CFG pile cap through the pile cap connecting steel bars. Adjacent CFG pile caps are connected by lattice beams. A mattress layer is laid on top of the CFG pile caps.
2. The CFG pile structure for reinforcing deep soft soil subgrade according to claim 1, characterized in that: The lower end of the pile cap connecting steel bar is embedded in the CFG pile, and the upper end of the pile cap connecting steel bar is embedded in the CFG pile cap.
3. The CFG pile structure for reinforcing deep soft soil subgrade according to claim 1, characterized in that: The mattress layer consists of a rigid mattress layer and a flexible mattress layer.
4. The CFG pile structure for reinforcing deep soft soil subgrade according to claim 3, characterized in that: The rigid mattress layer includes a plain concrete layer and a reinforced concrete layer, the flexible mattress layer is a graded crushed stone layer, a plain concrete layer is laid on top of the CFG pile cap, a graded crushed stone layer is laid on top of the plain concrete layer, and a reinforced concrete layer is laid on top of the graded crushed stone layer.
5. A CFG pile structure for reinforcing deep soft soil subgrades according to claim 1, characterized in that: The lattice beam is a reinforced concrete lattice beam.
6. The CFG pile structure for reinforcing deep soft soil subgrade according to claim 1, characterized in that: The distance between two adjacent CFG piles is 2.5-3 times the diameter of a single CFG pile.
7. A CFG pile structure for reinforcing deep soft soil subgrades according to claim 1, characterized in that: The raw materials for CFG piles are cement, fly ash, and original soil.