Anti-settling loess compaction pile composite foundation structure

Abstract

The utility model discloses a loess compaction pile composite foundation structure of anti -settling belongs to loess foundation technical field, including first stake body and second stake body, the second stake body is located first stake body downside, the second stake body bottom passes through the foundation layer and is embedded in the force -bearing layer, the second stake body bottom is filled with the gravel layer, the first stake body upper portion outside is equipped with the prefabricated stake body, the prefabricated stake body upside fixed mounting has hexagonal connector, the top of first stake body stretches to the ground surface outside and is connected with the mattress layer, and the mattress layer is formed through gravel filling. Through the above -mentioned way, the mattress layer, first stake body and second stake body can be connected, and the whole forms the net -like support, so that the foundation settlement deformation is more coordinated, the upper additional stress distribution is more reasonable, and the support stability and the shear strength are improved.

Description

Technical Field

[0001] This utility model relates to the field of loess foundation technology, specifically a loess compaction pile composite foundation structure for preventing settlement. Background Technology

[0002] Loess compaction pile composite foundation structure is an engineering structure used to treat collapsible loess foundations and effectively control foundation settlement. It consists of piles and compacted soil between piles. There are usually two types of piles: lime-soil piles and soil compaction piles. Lime-soil piles are made by filling plain soil into the pile hole in layers and compacting each layer. The soil between piles is formed when the original soil at the pile hole location is forcibly squeezed laterally during the drilling and layered filling of lime-soil or plain soil. The soil density between adjacent pile holes increases, thereby improving the engineering performance of the soil between piles. A cushion layer is usually set on top of the piles to ensure that the displacement of the piles and soil can develop in a coordinated manner after the composite foundation bears the load.

[0003] Chinese patent CN219261088U proposes a combined compaction pile method for treating collapsible loess foundation structures, comprising A compaction piles, B compaction piles, soil between piles, and a pile top cushion layer. The A compaction piles are arranged in a regular hexagonal pattern within the soil between piles, and the B compaction piles are arranged at the center of the regular hexagon. The pile top cushion layer is set at the top of the A and B compaction piles. The diameter of the B compaction piles is larger than that of the A compaction piles. The thickness of the pile top cushion layer is 50-100cm, and the pile top cushion layer is a lime-soil cushion layer or a cement-soil cushion layer.

[0004] However, the technical solution of this patent has the following problems: This patent cannot connect the mattress layer and the pile body to form a mesh-like overall support to make the stress distribution more reasonable.

[0005] Therefore, those skilled in the art have provided a loess compaction pile composite foundation structure for preventing settlement in order to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a loess compaction pile composite foundation structure for preventing settlement, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A loess compaction pile composite foundation structure for preventing settlement includes a first pile body and a second pile body. The second pile body is located below the first pile body. The bottom of the second pile body penetrates the ground layer and is embedded in the bearing layer. The bottom of the second pile body is filled with a crushed stone layer. A precast pile body is sleeved on the upper outer side of the first pile body. A hexagonal connector is fixedly installed on the upper side of the precast pile body. The top of the first pile body extends from the ground layer to the ground surface and is connected to a cushion layer, which is formed by filling with crushed stone. Furthermore, the hexagonal connector has multiple slots, in which transverse steel bars are fixedly installed. Multiple gaskets are welded onto the transverse steel bars, and the gaskets are in close contact with the hexagonal connector. Furthermore, the length of the second pile is greater than the length of the first pile; Furthermore, the diameter of the first pile is 1.5 times the diameter of the second pile; Furthermore, the first pile body adopts a triangular arrangement; Furthermore, multiple vertical reinforcing bars are fixedly installed on the lower side of the precast pile body; Furthermore, the first pile body is formed by mixing and compacting lime and soil in a volume ratio of 2:8. Furthermore, the second pile body is formed by mixing and compacting crushed stone and soil in a volume ratio of 1:9.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses a compaction method to form holes when drilling the second pile body at the bottom, and performs layered compaction during pile formation. This results in a significant reduction in porosity of the loess within the reinforcement area due to the compaction effect, effectively eliminating the collapsibility of the loess stratum. The first pile body at the top is precast to improve the overall rigidity and effectively bear the load transmitted from the upper pile body, thereby reducing the overall settlement of the foundation. Combined with the cushion layer at the top of the first pile body, multiple hexagonal connectors are cross-connected by transverse steel bars and shims to form a mesh, improving the overall support of the cushion layer. This makes the foundation settlement deformation more coordinated, the distribution of additional stress in the upper part more reasonable, and improves the support stability and shear strength. Ultimately, this ensures the safety of buildings constructed on collapsible strata, effectively controls the settlement of the foundation, and facilitates the connection of the cushion layer, the first pile body, and the second pile body to form a mesh support. This makes the foundation settlement deformation more coordinated, the distribution of additional stress in the upper part more reasonable, and improves the support stability and shear strength. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 Enlarged view of A in the middle; Figure 4 This is a partial structural diagram of the first pile body, the second pile body, the hexagonal connector, and the vertical reinforcing bars of this utility model; Figure 5 This is a partial structural diagram of the precast pile body, hexagonal connector, and vertical reinforcing bars of this utility model.

[0010] In the diagram: 1. First pile; 2. Second pile; 3. Crushed stone layer; 4. Precast pile; 5. Hexagonal connector; 6. Cushion layer; 7. Groove; 8. Horizontal reinforcement; 9. Shim; 10. Vertical reinforcement. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to... Figure 1 The direction of the viewpoint.

[0013] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-5 A loess compaction pile composite foundation structure for preventing settlement includes a first pile body 1 and a second pile body 2. The second pile body 2 is located below the first pile body 1. The bottom of the second pile body 2 passes through the subgrade and is embedded in the bearing layer. The bottom of the second pile body 2 is filled with a gravel layer 3. A precast pile body 4 is sleeved on the upper outer side of the first pile body 1. A hexagonal connector 5 is fixedly installed on the upper side of the precast pile body 4. The top of the first pile body 1 extends from the subgrade to the ground surface and is connected to a cushion layer 6. The cushion layer 6 is formed by filling with gravel. The gravel layer 3 provides support for the second pile body 2 and at the same time prevents water from accumulating at the bottom of the second pile body 2.

[0014] The hexagonal connector 5 has multiple slots 7, and transverse steel bars 8 are fixedly installed in the slots 7. Multiple gaskets 9 are welded to the transverse steel bars 8. The gaskets 9 are in close contact with the hexagonal connector 5. The multiple hexagonal connectors 5 are cross-connected together by the transverse steel bars 8 and the gaskets 9 to form a mesh, which improves the overall support of the mattress layer 6, makes the foundation settlement deformation more coordinated, and makes the distribution of additional stress in the upper part more reasonable. The connection between the transverse steel bars 8 and the hexagonal connector 5 can be further strengthened by continuing to weld steel bars on the upper side of the transverse steel bars 8 and continuing to pour on the upper side of the hexagonal connector 5.

[0015] Example 2: In some embodiments, such as Figures 1-5 In a preferred embodiment of the present invention, the length of the second pile body 2 is greater than the length of the first pile body 1.

[0016] The diameter of the first pile body 1 is 1.5 times the diameter of the second pile body 2.

[0017] The first pile body 1 adopts a triangular arrangement.

[0018] Multiple vertical reinforcing bars 10 are fixedly installed on the lower side of the precast pile body 4. The vertical reinforcing bars 10 penetrate into the second pile body 2, thereby improving the tensile strength between the precast pile body 4 and the second pile body 2.

[0019] The first pile body 1 is formed by mixing and compacting lime and soil in a volume ratio of 2:8.

[0020] The second pile body 2 is formed by mixing and compacting crushed stone and soil in a volume ratio of 1:9.

[0021] The lower second pile 2 is drilled using a compaction method, with layered compaction during pile formation. This compaction significantly reduces the porosity of the loess within the reinforcement area, effectively eliminating the collapsibility of the loess stratum. The upper first pile 1, with its precast pile body 4, enhances overall rigidity and effectively bears the load transmitted from the upper pile body, thereby reducing overall foundation settlement. Combined with the cushion layer 6 at the top of the first pile 1, multiple hexagonal connectors 5 are cross-connected by transverse steel bars 8 and washers 9 to form a mesh, improving the overall support of the cushion layer 6. This results in more coordinated foundation settlement deformation, a more reasonable distribution of additional stress in the upper part, and improved support stability and shear strength. Ultimately, this ensures the safety of buildings constructed on collapsible strata, effectively controls foundation settlement, and facilitates the connection of the cushion layer 6, the first pile 1, and the second pile 2, forming a mesh support that further coordinates foundation settlement deformation, rationally distributes additional stress in the upper part, and improves support stability and shear strength.

[0022] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A loess compaction pile composite foundation structure for preventing sedimentation, comprising a first pile body (1) and a second pile body (2), characterized in that, The second pile body (2) is located below the first pile body (1). The bottom of the second pile body (2) passes through the ground layer and is embedded in the bearing layer. The bottom of the second pile body (2) is filled with a gravel layer (3). A precast pile body (4) is sleeved on the upper outer side of the first pile body (1). A hexagonal connector (5) is fixedly installed on the upper side of the precast pile body (4). The top of the first pile body (1) extends out of the ground layer to the ground surface and is connected to a mattress layer (6).

2. The anti-settling loess compaction pile composite foundation structure according to claim 1, characterized in that, The hexagonal connector (5) has multiple slots (7), and a transverse steel bar (8) is fixedly installed in the slot (7). Multiple gaskets (9) are welded on the transverse steel bar (8), and the gaskets (9) are in close contact with the hexagonal connector (5).

3. The anti-settlement loess compaction pile composite foundation structure according to claim 1, characterized in that, The length of the second pile (2) is greater than the length of the first pile (1).

4. The anti-settlement loess compaction pile composite foundation structure according to claim 1, characterized in that, The diameter of the first pile (1) is 1.5 times the diameter of the second pile (2).

5. The anti-settlement loess compaction pile composite foundation structure according to claim 1, characterized in that, The first pile body (1) adopts a triangular arrangement.

6. The anti-settlement loess compaction pile composite foundation structure according to claim 1, characterized in that, Multiple vertical steel bars (10) are fixedly installed on the lower side of the precast pile (4).

7. The anti-settlement loess compaction pile composite foundation structure according to claim 1, characterized in that, The first pile body (1) is formed by mixing and compacting lime and soil in a volume ratio of 2:

8.

8. The anti-settlement loess compaction pile composite foundation structure according to claim 1, characterized in that, The second pile body (2) is formed by mixing and compacting crushed stone and soil in a volume ratio of 1:9.

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