Compacting pile and CFG pile composite foundation structure in loess layer

Abstract

The utility model discloses a composite foundation structure of compaction piles and CFG piles in a loess layer, which belongs to the technical field of composite foundations and comprises the loess layer, a foundation groove is tamped at the top end of the loess layer, a gravel soil layer is arranged in the foundation groove, and a first reinforcing layer, a first concrete layer, a second reinforcing layer and a second concrete layer are sequentially arranged in the foundation groove from bottom to top. The first reinforcing layer is arranged on the top of the gravel soil layer, the first reinforcing layer and the second reinforcing layer are each formed by splicing a plurality of concrete slabs, and a plurality of first penetrating holes and a plurality of second penetrating holes are formed in the top end of each concrete slab. The bearing capacity of the composite foundation can be improved through the multiple compaction piles, the bearing capacity of the composite foundation can be remarkably improved through the multiple CFG piles, sedimentation can be reduced, and the composite foundation is formed by combining the gravel soil layer, the first reinforcing layer, the first concrete layer, the second reinforcing layer and the second concrete layer. And the bearing capacity and the pressure resistance of the whole foundation can be further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite foundations, and belongs to a composite foundation structure of compaction piles and CFG piles in a loess layer. Background Art

[0002] The foundation is the lowest part of the building structure. Its main function is to transfer the weight of the building to the ground to ensure the stability and safety of the building. The design and construction of the foundation need to consider many factors, including soil type, geological conditions, hydrological conditions, load size, etc. Since the loess layer is soft, the loess layer composite foundation structure needs to be designed differently according to the geology. By setting up different structures, the bearing capacity of the foundation can be improved, settlement can be reduced, stability can be enhanced, and the safety and functional requirements of the building can be met.

[0003] For example, the prior art publication number is CN214033658U, which is an environmentally friendly collapsible loess foundation reinforcement structure. The utility model improves the structural strength of the loess foundation by arranging an armor layer, an alloy braided layer and steel bars on the top of the soil base layer. By arranging a mixed layer and reinforcement ribs cast by cement and mortar on the top of the armor layer, the structural strength of the loess foundation is improved and it is not easy to be deformed and damaged.

[0004] However, the above-mentioned prior art still has the following problems when used: since the loess soil is soft, the stability of the entire loess foundation is low, and the loess foundation will collapse, resulting in low bearing capacity, which will in turn affect the strength of the base and the building. Based on this, the utility model provides a composite foundation structure of compaction piles and CFG piles with high bearing capacity in the loess layer. Utility Model Content

[0005] To this end, the utility model provides a composite foundation structure of compaction piles and CFG piles in a loess layer to solve the problem of low foundation bearing capacity due to the instability between the foundation and the loess in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A composite foundation structure of compaction piles and CFG piles in a loess layer, comprising a loess layer, a foundation trench rammed on the top of the loess layer, a crushed stone soil layer arranged inside the foundation trench, a first reinforcement layer, a first concrete layer, a second reinforcement layer and a second concrete layer arranged in sequence from bottom to top in the foundation trench, the first reinforcement layer being arranged on the top of the crushed stone soil layer, the first reinforcement layer and the second reinforcement layer being both formed by splicing a plurality of concrete slabs, a plurality of first through-holes and a plurality of second through-holes being opened on the top of each concrete slab, a plurality of compaction piles and a plurality of CFG piles running through the loess layer, the compaction piles being driven or pressed into the pile body in the foundation so that the soil body is compacted, thereby improving the bearing capacity and stability of the foundation, the CFG pile being a pile body formed by mixing materials such as cement, fly ash and crushed stone, and having a pile body with certain strength and stability, thereby improving the bearing capacity of the foundation and reducing the settlement of the foundation.

[0008] Furthermore, a plurality of compaction piles sequentially penetrate the gravel soil layer, the first concrete layer, the second concrete layer and the plurality of first perforations, and a plurality of CFG piles sequentially penetrate the gravel soil layer, the first concrete layer, the second concrete layer and the plurality of second perforations. The plurality of compaction piles and the plurality of CFG piles are used in combination to greatly improve the bearing capacity and compression resistance of the composite foundation.

[0009] Furthermore, a plurality of positioning rods are fixedly provided at the bottom end of each concrete slab, and the plurality of positioning rods are evenly distributed at the bottom of the concrete slab. A plurality of positioning grooves are opened at the top end of each concrete slab, and the plurality of positioning rods are respectively inserted into the plurality of positioning grooves. The two concrete slabs distributed upper and lower are connected by the plurality of positioning rods. The plurality of positioning rods located at the bottom of the foundation trench are inserted into the gravel layer and the loess layer, so as to improve the firmness between the concrete slab and the loess layer.

[0010] Furthermore, the plurality of first perforations and the plurality of second perforations are evenly distributed on the concrete slab, and the plurality of first perforations, the plurality of second perforations and the plurality of positioning rods are staggered, thereby avoiding staggered distribution of the plurality of compaction piles, the plurality of CFG piles and the plurality of positioning rods.

[0011] Furthermore, two adjacent concrete slabs are spliced ​​together by a plurality of limit blocks and a plurality of limit grooves, so as to improve the firmness between the two adjacent concrete slabs.

[0012] Furthermore, a plurality of storage grooves are provided on the top of each concrete slab, and a lifting ring is fixed in each storage groove. By providing the lifting ring, it is convenient to lay the concrete slab with the help of lifting equipment, which saves time and effort in use.

[0013] Furthermore, a sealing plug is inserted into each receiving groove, a circular groove is formed at the bottom end of the sealing plug, and the hanging ring is arranged in the circular groove. After the concrete slab is laid, the circular groove can be sealed by the sealing plug.

[0014] Furthermore, a plurality of annular foundation grooves are formed on the outer wall surface of each positioning rod, and the plurality of annular foundation grooves are evenly distributed on the positioning rod. By providing a plurality of annular foundation grooves, the firmness of the positioning rod during installation can be improved.

[0015] The utility model has the following advantages:

[0016] 1. The utility model can improve the bearing capacity of the composite foundation through multiple compaction piles. Multiple CFG piles can not only significantly improve the bearing capacity of the composite foundation, but also reduce settlement. The combination of the crushed stone soil layer, the first reinforcement layer, the first concrete layer, the second reinforcement layer and the second concrete layer can further improve the bearing capacity and compression resistance of the entire foundation.

[0017] 2. By plugging multiple positioning rods into multiple positioning grooves, the connection firmness between the two upper and lower concrete slabs can be improved, and the firmness of the concrete slab on the top of the gravel soil layer can be improved, thereby further improving the bearing capacity of the composite foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0020] Figure 1 The overall structural diagram provided by the utility model;

[0021] Figure 2 A structural diagram of a crushed stone soil layer, a first reinforcement layer, a first concrete layer, a second reinforcement layer, and a second concrete layer provided by the utility model;

[0022] Figure 3 The utility model provides Figure 2 Front structure diagram;

[0023] Figure 4 A plurality of concrete slab structure diagrams provided by the utility model;

[0024] Figure 5 This is a partial cross-sectional view of the concrete slab provided by the utility model.

[0025] In the figure: 1, loess layer; 2, foundation trench; 3, gravel soil layer; 4, first reinforcement layer; 5, first concrete layer; 6, second reinforcement layer; 7, second concrete layer; 8, concrete slab; 9, compaction pile; 10, CFG pile; 11, limit block; 12, limit groove; 13, storage groove; 14, lifting ring; 15, sealing plug; 16, circular groove; 17, annular foundation groove;

[0026] 801, first through hole; 802, second through hole; 803, positioning rod; 804, positioning groove. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Refer to the instruction manual Figure 1-5 The utility model provides a composite foundation structure of compaction piles and CFG piles in a loess layer, comprising a loess layer 1, a foundation trench 2 is rammed on the top of the loess layer 1, a crushed stone soil layer 3 is arranged inside the foundation trench 2, a first reinforcement layer 4, a first concrete layer 5, a second reinforcement layer 6 and a second concrete layer 7 are arranged in sequence from bottom to top in the foundation trench 2, and the first reinforcement layer 4 is arranged on the top of the crushed stone soil layer 3;

[0029] The first reinforcement layer 4 and the second reinforcement layer 6 are both formed by splicing a plurality of concrete slabs 8, each of which is provided with a plurality of first through-holes 801 and a plurality of second through-holes 802 at the top, and a plurality of compaction piles 9 and a plurality of CFG piles 10 are penetrated inside the loess layer 1, and the plurality of compaction piles 9 sequentially penetrate the gravel soil layer 3, the first concrete layer 5, the second concrete layer 7 and the plurality of first through-holes 801, and the plurality of CFG piles 10 sequentially penetrate the gravel soil layer 3, the first concrete layer 5, the second concrete layer 7 and the plurality of second through-holes 802, and the plurality of compaction piles 9 and the plurality of CFG piles 10 are used in combination to greatly improve the bearing capacity and compression resistance of the composite foundation;

[0030] In addition, multiple first perforations 801 and multiple second perforations 802 are evenly distributed on the concrete slab 8, and multiple first perforations 801, multiple second perforations 802 and multiple positioning rods 803 are staggered to avoid staggered distribution of multiple compaction piles 9, multiple CFG piles 10 and multiple positioning rods 803. Two adjacent concrete slabs 8 are spliced ​​together by multiple limit blocks 11 and multiple limit grooves 12 to improve the firmness between the two adjacent concrete slabs 8.

[0031] When in use, a tamping device is used to tamp a foundation trench 2 on the top of the loess layer 1. Then, after installing multiple compaction piles 9 and multiple CFG piles 10 in the foundation trench 2, crushed stone soil is first poured into the foundation trench 2 to form a crushed stone soil layer 3. Then, a first reinforcement layer 4 is laid on the top of the crushed stone soil layer 3. Concrete is poured on the top of the first reinforcement layer 4 to form a first concrete layer 5. Then, multiple concrete slabs 8 are laid on the top of the first concrete layer 5 to form a second reinforcement layer 6. Finally, concrete is poured on the top of the second reinforcement layer 6 to form a second concrete layer 7. A composite foundation can be formed. The compaction piles 9 can improve the bearing capacity of the composite foundation. The CFG piles 10 can significantly improve the bearing capacity of the composite foundation and reduce settlement. The crushed stone soil layer 3, the first reinforcement layer 4, the first concrete layer 5, the second reinforcement layer 6 and the second concrete layer 7 are combined to further improve the bearing capacity and compression resistance of the entire foundation.

[0032] Refer to the instruction manual Figure 1-5 , a plurality of positioning rods 803 are fixedly provided at the bottom of each concrete slab 8, and the plurality of positioning rods 803 are evenly distributed at the bottom of the concrete slab 8, a plurality of positioning grooves 804 are opened at the top of each concrete slab 8, and the plurality of positioning rods 803 are respectively inserted into the plurality of positioning grooves 804, and the two upper and lower concrete slabs 8 are connected by the plurality of positioning rods 803, and the plurality of positioning rods 803 located at the bottom of the foundation trench 2 are inserted into the gravel soil layer 3 and the loess layer 1;

[0033] A plurality of annular foundation grooves 17 are formed on the outer wall surface of each positioning rod 803, and the plurality of annular foundation grooves 17 are evenly distributed on the positioning rod 803. By providing a plurality of annular foundation grooves 17, the firmness of the positioning rod 803 during installation can be improved;

[0034] When laying the first reinforcement layer 4 and the second reinforcement layer 6 distributed up and down, the concrete slabs 8 distributed up and down are connected through multiple positioning rods 803 and multiple positioning grooves 804, and the multiple positioning rods 803 on the multiple concrete slabs 8 located at the bottom of the foundation trench 2 are inserted into the gravel soil layer 3 and the loess layer 1, so as to improve the firmness between the concrete slabs 8 and the loess layer 1.

[0035] A plurality of receiving grooves 13 are provided at the top of each concrete slab 8, and a lifting ring 14 is fixed in each receiving groove 13. By providing the lifting ring 14, it is convenient to lay the concrete slab 8 with the help of lifting equipment, which is more time-saving and labor-saving to use. A sealing plug 15 is inserted in each receiving groove 13, and a circular groove 16 is provided at the bottom end of the sealing plug 15. The lifting ring 14 is arranged in the circular groove 16. After the concrete slab 8 is laid, the circular groove 16 can be sealed by the sealing plug 15.

[0036] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A composite foundation structure of compaction piles and CFG piles in loess layer, characterized by: The invention comprises a loess layer (1), a foundation trench (2) is rammed on the top of the loess layer (1), a crushed stone soil layer (3) is arranged inside the foundation trench (2), a first reinforcement layer (4), a first concrete layer (5), a second reinforcement layer (6) and a second concrete layer (7) are arranged in sequence from bottom to top in the foundation trench (2), and the first reinforcement layer (4) is arranged on the top of the crushed stone soil layer (3); The first reinforcement layer (4) and the second reinforcement layer (6) are both formed by splicing a plurality of concrete slabs (8), each concrete slab (8) having a plurality of first through holes (801) and a plurality of second through holes (802) at the top thereof, and a plurality of compaction piles (9) and a plurality of CFG piles (10) are penetrated inside the loess layer (1).

2. The composite foundation structure of compaction piles and CFG piles in loess layer according to claim 1, characterized in that: The plurality of compaction piles (9) sequentially penetrate the gravel soil layer (3), the first concrete layer (5), the second concrete layer (7) and the plurality of first perforations (801), and the plurality of CFG piles (10) sequentially penetrate the gravel soil layer (3), the first concrete layer (5), the second concrete layer (7) and the plurality of second perforations (802).

3. The composite foundation structure of compaction piles and CFG piles in loess layer according to claim 1, characterized in that: A plurality of positioning rods (803) are fixedly provided at the bottom end of each concrete slab (8), and the plurality of positioning rods (803) are evenly distributed at the bottom of the concrete slab (8). A plurality of positioning grooves (804) are opened at the top end of each concrete slab (8), and the plurality of positioning rods (803) are respectively inserted into the plurality of positioning grooves (804). The two concrete slabs (8) distributed up and down are connected by the plurality of positioning rods (803), and the plurality of positioning rods (803) located at the bottom of the foundation trench (2) are inserted into the gravel soil layer (3) and the loess layer (1).

4. The composite foundation structure of compaction piles and CFG piles in loess layer according to claim 3 is characterized by: The plurality of first through-holes (801) and the plurality of second through-holes (802) are evenly distributed on the concrete slab (8), and the plurality of first through-holes (801), the plurality of second through-holes (802) and the plurality of positioning rods (803) are staggeredly distributed.

5. The composite foundation structure of compaction piles and CFG piles in loess layer according to claim 1, characterized in that: Two adjacent concrete slabs (8) are spliced ​​together via a plurality of limiting blocks (11) and a plurality of limiting grooves (12).

6. The composite foundation structure of compaction piles and CFG piles in loess layer according to claim 1, characterized in that: A plurality of receiving grooves (13) are provided at the top of each concrete slab (8), and a hanging ring (14) is fixedly provided in each receiving groove (13).

7. The composite foundation structure of compaction piles and CFG piles in loess layer according to claim 6, characterized in that: A sealing plug (15) is inserted into each receiving groove (13), a circular groove (16) is formed at the bottom end of the sealing plug (15), and the hanging ring (14) is arranged in the circular groove (16).

8. The composite foundation structure of compaction piles and CFG piles in loess layer according to claim 3, characterized in that: A plurality of annular foundation grooves (17) are formed on the outer wall surface of each positioning rod (803), and the plurality of annular foundation grooves (17) are evenly distributed on the positioning rod (803).

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