Improved soft ground foundation structure

Abstract

The utility model discloses an improved soft soil foundation structure, including the geopolymer mixing pile and several broken stone piles of several geopolymer mixing piles that are vertically extended into the soft weak soil foundation, the broken stone pile is between the adjacent geopolymer mixing pile, the top surface of soft weak soil foundation is sequentially provided with broken stone cushion layer, sand and soil backfill layer, water resisting layer and leveling layer from bottom to top, the top of geopolymer mixing pile, the top of broken stone pile all support on the bottom surface of broken stone cushion layer, and the side portion of broken stone cushion layer is provided with the drainage ditch, the structure of the utility model is reasonable, sets up several geopolymer mixing piles and several broken stone piles, can improve the integrity and bearing capacity of soft weak soil foundation greatly, is favorable to make the foundation stress more uniform, is favorable to avoid the uneven settlement of foundation, the top surface of soft weak soil foundation is sequentially provided with broken stone cushion layer, sand and soil backfill layer, water resisting layer and leveling layer from bottom to top, can construct the three -dimensional drainage system, can accelerate the drainage consolidation speed of soft weak soil foundation, improves its applicability.

Description

Technical Field

[0001] This utility model belongs to the field of soft soil foundation treatment technology, specifically relating to an improved soft soil foundation structure. Background Technology

[0002] As the final load-bearing structure of an engineering project, the foundation is an indispensable part of the project. The saying "a weak foundation leads to an unstable ground" illustrates the importance of the foundation and its treatment. Soft soil foundations are widely distributed in my country. These foundations not only have characteristics such as high water content, high compressibility, and low strength, but also contain organic matter, especially inland lacustrine and riverine soft soils. The presence of organic matter significantly reduces the mechanical and durability properties of cement-stabilized soil, adversely affecting its performance. Therefore, construction on cement-stabilized soil foundations is prone to instability or uneven settlement, posing a severe challenge to the construction and operation of infrastructure.

[0003] Cement binder is a high-energy-consuming and high-polluting product. Incomplete hydration of cement in the early stages can easily lead to low early strength of cement-mixed piles, making it difficult to provide support quickly. Furthermore, traditional cement-mixed pile composite foundations all use independent piles with large spacing. Due to the large difference in strength between the piles and the soil, uneven settlement can easily occur between the piles, or a high-strength foundation structure is required to bear the load of the piles. For example, the crushed stone frame structure reinforcement system for collapsible loess foundations shown in 201720076460.1, although it can meet the general usage requirements, has a weak bearing capacity and a slow solidification speed of soft soil, which to some extent affects its scope of application and limits its applicability. Utility Model Content

[0004] The purpose of this invention is to provide an improved soft soil foundation structure with a reasonable structural design that is conducive to improving bearing capacity and the solidification speed of soft soil.

[0005] The technical solution for achieving the purpose of this utility model is an improved soft soil foundation structure, including a number of geopolymer mixing piles and a number of crushed stone piles that extend vertically into the soft soil foundation; The crushed stone pile is located between adjacent aggregate mixing piles; The top surface of the soft soil foundation is provided with a crushed stone cushion layer, a sand and gravel backfill layer, a waterproof layer and a leveling layer from bottom to top. The top of the geopolymer mixing pile and the top of the crushed stone pile are both supported on the bottom surface of the crushed stone cushion layer. A drainage ditch is provided on the side of the crushed stone cushion layer.

[0006] A further preferred embodiment is that the geopolymer mixing pile includes a main geopolymer mixing pile located at the bottom of the soft soil foundation and several supporting geopolymer mixing piles located at the top of the soft soil foundation. The bottom ends of several of the aforementioned geopolymer mixing pile supports are connected to the middle of the side wall of the geopolymer mixing pile main trunk; The upper parts of several of the aforementioned geopolymer mixing pile supports are arranged in a forked manner.

[0007] A further preferred embodiment is that the main trunk of the geopolymer mixing pile is a frustum-shaped trunk that is narrower at the top and wider at the bottom; The support structure of the geopolymer mixing pile is a frustum-shaped support structure that is larger at the bottom and smaller at the top.

[0008] A further preferred embodiment is that the number of geopolymer mixing pile branches on the main trunk of the geopolymer mixing pile is three, and the angle between the geopolymer mixing pile branches and the main trunk of the geopolymer mixing pile is 10°-15°.

[0009] A further preferred embodiment is that the bottom diameter of the main trunk of the geopolymer mixing pile is 800mm-1000mm, and the top diameter is 500mm-600mm; The length of the main trunk of the geopolymer mixing pile is 5m-10m, and the spacing S between adjacent main trunks of the geopolymer mixing pile is 1.5m-3m.

[0010] A further preferred embodiment is that the lower diameter of the geopolymer mixing pile support is 500mm-600mm, and the upper diameter is 300mm-400mm; The length of the support for the geopolymer mixing pile is 3m-6m.

[0011] A further preferred embodiment is that the waterproof layer is a flat layer with a thickness of 5mm, formed by spreading SBS modified bitumen waterproof membrane.

[0012] A further preferred embodiment is that the leveling layer is a planar layer with a thickness of 150 mm to 200 mm, made of geopolymer composite concrete material.

[0013] A further preferred embodiment is that the sand and gravel backfill layer is a planar layer made of sand and gravel mixed with geopolymer, with a thickness of 300mm-500mm and a compaction degree ≥0.96.

[0014] A further preferred embodiment is that the crushed stone cushion layer is a planar layer with a particle size of 5 mm to 30 mm and a thickness of 100 mm to 150 mm.

[0015] A further preferred embodiment is that the diameter of the crushed stone pile is 150mm-250mm, and the height of the crushed stone pile is the same as the total height of the geopolymer mixing pile.

[0016] This utility model has positive effects: The structure of this utility model is reasonable. By setting several aggregate mixing piles and several crushed stone piles, it can greatly improve the integrity and bearing capacity of the soft soil foundation, which is conducive to making the foundation more uniform in stress and avoiding uneven settlement of the foundation. Furthermore, the top surface of the soft soil foundation is provided with a crushed stone cushion layer, a sand and gravel backfill layer, a water-proof layer and a leveling layer from bottom to top. A drainage ditch is set on the side of the crushed stone cushion layer, which can form a three-dimensional drainage system, which can accelerate the drainage and consolidation speed of the soft soil foundation and improve its applicability. Furthermore, the polymer mixing pile includes a main polymer mixing pile at the bottom of the soft soil foundation and several supporting polymer mixing piles at the top of the soft soil foundation; the upper parts of the several supporting polymer mixing piles are arranged in a forked manner, which can reduce the number of polymer mixing piles, thereby reducing the project cost and saving costs, and can also improve the overall bearing capacity of the soft soil foundation, making the foundation more uniformly stressed; At the same time, the use of geopolymer mixing piles is also beneficial to reduce costs, and its excellent mechanical and durability properties can also improve the reliability of the pile foundation. Attached Figure Description

[0017] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic cross-sectional view of the improved soft soil foundation structure of this utility model; Figure 2 This is a quincunx-shaped layout diagram of the geopolymer mixing piles for the improved soft soil foundation structure of this utility model; Figure 3 This is a cross-sectional view of the geopolymer mixing pile for improving soft soil foundation structure according to this utility model; Figure 4 This is a three-dimensional structural diagram of the geopolymer mixing pile for improving soft soil foundation structure according to this utility model.

[0018] Attached diagram labels: 1. Leveling layer; 2. Waterproof layer; 3. Sand and gravel backfill layer; 4. Crushed stone cushion layer; 5. Drainage ditch; 6. Geopolymer mixing pile; 61. Main trunk of geopolymer mixing pile; 62. Branch trunk of geopolymer mixing pile; 7. Crushed stone pile; 8. Soft soil foundation. Detailed Implementation

[0019] 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.

[0020] Example 1 See Figures 1 to 4 As shown, an improved soft soil foundation structure includes several aggregate mixing piles 6 and several gravel piles 7 extending vertically into the soft soil foundation 8; the gravel piles 7 are located between adjacent aggregate mixing piles 6; in this embodiment, the diameter of the gravel piles 7 is 150mm-250mm, and the height of the gravel piles 7 is the same as the total height of the aggregate mixing piles 6, and the gravel piles 7 are filled with gravel with a particle size of 1mm-5mm. In actual application, the vertical deviation of the gravel piles 7 is ≤1%. like Figure 1 As shown, a gravel cushion layer 4, a sand and gravel backfill layer 3, a waterproof layer 2, and a leveling layer 1 are sequentially arranged from bottom to top on the top surface of the soft soil foundation 8. Simultaneously, the tops of the aggregate mixing piles 6 and the gravel piles 7 are both supported on the bottom surface of the gravel cushion layer 4. A drainage ditch 5 is provided on the side of the gravel cushion layer 4. The location of the drainage ditch 5 on the side of the gravel cushion layer 4 facilitates the formation of a three-dimensional drainage system, which helps to accelerate the drainage and consolidation speed of the soft soil foundation 8.

[0021] In this embodiment, the leveling layer 1 is a planar layer with a thickness of 150 mm to 200 mm, laid with a geopolymer composite concrete material. The geopolymer composite concrete material is composed of a mixture of geopolymer and cement in a 1:1 weight ratio, and its formed surface has a compressive strength of 25 MPa. The waterproof layer 2 is a 5mm thick planar layer made of SBS modified bitumen waterproof membrane. It is a conventional structure in existing technology and therefore not described in detail: SBS modified bitumen is made by using base bitumen as raw material, adding a certain proportion of SBS modifier, and dispersing SBS evenly in the bitumen through shearing, stirring, and other methods. Simultaneously, a certain proportion of a specific stabilizer is added to form an SBS blend material, utilizing the excellent physical properties of SBS to modify the bitumen. SBS belongs to the styrene-based thermoplastic elastomer and is a styrene-butadiene-styrene triblock copolymer.

[0022] The sand and gravel backfill layer 3 is a planar layer with a thickness of 300mm-500mm and a compaction degree of ≥0.96, made of a mixture of sand and gravel and geopolymer.

[0023] The crushed stone cushion layer 4 is a planar layer with a particle size of 5 mm to 30 mm and a thickness of 100 mm to 150 mm.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, in this embodiment, the polymer mixing pile 6 includes a main polymer mixing pile 61 located below the soft soil foundation 8 and several supporting polymer mixing piles 62 located above the soft soil foundation 8. The bottom ends of the supporting polymer mixing piles 62 are connected to the middle of the side wall of the main polymer mixing pile 61. The upper parts of the supporting polymer mixing piles 62 are arranged in a forked manner. Because the upper parts of the supporting polymer mixing piles 62 are arranged in a forked manner, the integrity and bearing capacity of the soft soil foundation 8 can be improved, and the stress on the foundation can be evenly distributed, avoiding uneven settlement of the foundation. At the same time, the number of polymer mixing piles 6 can be reduced, thus reducing the project cost. like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the main trunk 61 of the geopolymer mixing pile is a frustum-shaped trunk, narrower at the top and wider at the bottom; the branch trunks 62 of the geopolymer mixing pile are frustum-shaped branches, wider at the bottom and narrower at the top. In practical applications, there are three branch trunks 62 on the main trunk 61, and the angle between the branch trunks 62 and the main trunk 61 is 10°-15°. In practical applications, the bottom diameter of the main trunk 61 is 800mm-1000mm, and the top diameter is 500mm-600mm; the length of the main trunk 61 is 5m-10m, and the spacing S between adjacent main trunks 61 is 1.5m-3m.

[0025] In this embodiment, the bottom diameter of the main trunk 61 of the geopolymer mixing pile is 800mm and the top diameter is 500mm; the length of the main trunk 61 of the geopolymer mixing pile is 10m; and the spacing between adjacent main trunks 61 of the geopolymer mixing pile is 2m.

[0026] In practical applications, the lower diameter of the geopolymer mixing pile support 62 is 500mm-600mm, and the top diameter is 300mm-400mm; the length of the geopolymer mixing pile support 62 is 3m-6m.

[0027] In this embodiment, the lower diameter of the geopolymer mixing pile support 62 is 500mm and the upper diameter is 300mm; the length of the geopolymer mixing pile support 62 is 4m.

[0028] Furthermore, during the processing, the geopolymer mixing pile support 62 contains plant fibers with a length of 30 mm to 50 mm and a diameter of 0.1 mm to 0.3 mm, thereby reducing processing costs.

[0029] In this embodiment, the geopolymer mixing pile 6 is made by mixing geopolymer and soft soil, with a geopolymer content of 15%. The geopolymer is composed of an alkali activator and a precursor. The alkali activator is composed of sodium silicate and sodium hydroxide with a modulus of 1.5. The precursor is slag and fly ash.

[0030] The application of low-carbon cementitious materials can effectively reduce carbon emissions and achieve low-carbon, energy-saving and sustainable development in the construction industry.

[0031] Geopolymer, also known as geopolymer, is an inorganic silica-alumina cementitious material proposed by French scientist J. Davidovits in 1978. Its chemical formula is Mn{-(SiO2)zAlO2}n•wH2O. It exists in an amorphous to semi-crystalline state and belongs to the non-metallic material category. It consists of a three-dimensional network structure composed of silicon-oxygen tetrahedra and aluminum-oxygen tetrahedra. This material is prepared from industrial solid waste (fly ash, slag, etc.) through an alkali-activated reaction and has the potential to replace traditional cement, finding applications in building materials, solid waste treatment, and high-temperature coatings. It represents the conventional structure of existing technologies.

[0032] This utility model has positive effects: The structure of this utility model is reasonable. By setting several aggregate mixing piles 6 and several crushed stone piles 7, it can greatly improve the integrity and bearing capacity of the soft soil foundation 8, which is conducive to making the foundation more uniform in stress and avoiding uneven settlement of the foundation. Furthermore, the top surface of the soft soil foundation 8 is provided with a crushed stone cushion layer 4, a sand and gravel backfill layer 3, a water-proof layer 2 and a leveling layer 1 from bottom to top. A drainage ditch 5 is provided on the side of the crushed stone cushion layer 4, which can form a three-dimensional drainage system, which can accelerate the drainage and consolidation speed of the soft soil foundation 8 and improve its applicability. Furthermore, the polymer mixing pile 6 includes a main polymer mixing pile 61 located below the soft soil foundation 8 and several supporting polymer mixing piles 62 located above the soft soil foundation 8; the upper parts of the several supporting polymer mixing piles 62 are arranged in a forked manner, which can reduce the number of polymer mixing piles, thereby reducing the project cost and saving costs, and can also improve the overall bearing capacity of the soft soil foundation 8, making the foundation stress more uniform; At the same time, the use of geopolymer mixing piles is also beneficial to reduce costs, and its excellent mechanical and durability properties can also improve the reliability of the pile foundation.

[0033] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0034] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. An improved soft ground structure, characterized by: Includes several geopolymer mixing piles (6) and several gravel piles (7) that extend vertically into the soft soil foundation (8); The crushed stone pile (7) is located between adjacent aggregate mixing piles (6); The top surface of the soft soil foundation (8) is provided with a crushed stone cushion layer (4), a sand and gravel backfill layer (3), a water-proof layer (2) and a leveling layer (1) from bottom to top. The top of the geopolymer mixing pile (6) and the top of the crushed stone pile (7) are both supported on the bottom surface of the crushed stone cushion layer (4); The side of the crushed stone cushion layer (4) is provided with a drainage ditch (5).

2. The improved soft ground structure according to claim 1, wherein: The geopolymer mixing pile (6) includes a geopolymer mixing pile main trunk (61) located below the soft soil foundation (8) and several geopolymer mixing pile branches (62) located above the soft soil foundation (8). The bottom ends of several of the aforementioned polymer mixing pile branches (62) are connected to the middle of the side wall of the polymer mixing pile main branch (61); The upper parts of several of the aforementioned geopolymer mixing pile supports (62) are arranged in a forked manner.

3. The improved soft ground structure of claim 2, wherein: The main trunk (61) of the geopolymer mixing pile is a frustum-shaped trunk that is narrow at the top and wide at the bottom; The support (62) of the geopolymer mixing pile is a frustum-shaped support that is larger at the bottom and smaller at the top.

4. The improved soft ground structure according to claim 3, wherein: The number of geopolymer mixing pile branches (62) on the main trunk (61) of the geopolymer mixing pile is three, and the angle between the geopolymer mixing pile branch (62) and the main trunk (61) of the geopolymer mixing pile is 10°-15°.

5. The improved soft ground structure according to claim 3, wherein: The bottom diameter of the main trunk (61) of the geopolymer mixing pile is 800mm-1000mm and the top diameter is 500mm-600mm; The length of the main trunk (61) of the geopolymer mixing pile is 5m-10m, and the spacing S between adjacent main trunks (61) of the geopolymer mixing pile is 1.5m-3m.

6. The improved soft ground foundation structure of claim 5, wherein: The lower diameter of the geopolymer mixing pile support (62) is 500mm-600mm, and the upper diameter is 300mm-400mm; The length of the supporting trunk (62) of the geopolymer mixing pile is 3m-6m.

7. The improved soft ground foundation structure of claim 1, wherein: The waterproof layer (2) is a flat layer with a thickness of 5mm, which is made of SBS modified bitumen waterproof membrane.

8. The improved soft ground foundation structure of claim 1, wherein: The leveling layer (1) is a planar layer with a thickness of 150 mm to 200 mm, which is laid with geopolymer composite concrete material.

9. The improved soft ground foundation structure of claim 1, wherein: The sand and gravel backfill layer (3) is a planar layer with a thickness of 300mm-500mm and a compaction degree of ≥0.96, made of a mixture of sand and gravel and geopolymer.

10. The improved soft ground foundation structure of claim 1, wherein: The crushed stone cushion layer (4) is a planar layer with a particle size of 5 mm to 30 mm and a thickness of 100 mm to 150 mm. The diameter of the crushed stone pile (7) is 150mm-250mm, and the height of the crushed stone pile (7) is the same as the total height of the geopolymer mixing pile (6).

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