Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Rigid gridding and pile combined foundation and its use in soft soil foundation reinforcement

A composite foundation and soft soil foundation technology, applied in soil protection, sheet pile walls, foundation structure engineering, etc., can solve the problems of limited depth of soft soil foundation, failure to meet foundation reinforcement requirements, limited strength and deformation performance, etc. Achieve the effect of improving design and construction quality, benefiting design calculation and analysis, and good reinforcement effect

Inactive Publication Date: 2010-08-11
SOUTH CHINA UNIV OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of various complex geological factors and unfavorable soft soil properties, the existing various soft soil foundation reinforcement methods have certain shortcomings.
For example, the drainage consolidation method has disadvantages such as long construction period, limited improvement in strength and deformation performance, difficulty in improving secondary consolidation deformation, and large post-construction settlement. It cannot meet the foundation reinforcement requirements of bridges or culverts with strict control of settlement difference
When using the mixing pile method to strengthen soft soil foundations such as silt, there are disadvantages such as low pile body strength, large soil deformation between piles, limited depth of reinforced soft soil foundation (limited by mechanical construction capabilities), and high construction costs.
The strength of the cement mixing pile is low due to the low pH value, high moisture content, fine particles, and a lot of organic matter in soft soil such as silt; the length of the mixing pile is generally less than 20m, and the reinforcement depth is limited. In addition, the soil between the piles is not reinforced. Large deformation, so the soft soil foundation reinforced by mixing piles may still produce large settlement
Moreover, the construction cost of the mixing pile is relatively high, and it is generally not suitable for large-area soft soil foundation reinforcement.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rigid gridding and pile combined foundation and its use in soft soil foundation reinforcement
  • Rigid gridding and pile combined foundation and its use in soft soil foundation reinforcement
  • Rigid gridding and pile combined foundation and its use in soft soil foundation reinforcement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] As shown in Figure 1, the rigid grid and pile composite foundation consists of prefabricated piles 1, rigid grid structure 2, tension net 4 and transition cushion 5. The prefabricated piles pass through the soft soil layer 6, and are driven from the foundation surface to the relatively hard soil layer 7. The distance between the prefabricated piles is 0.6m, and the cross-sectional size of the prefabricated square piles is 0.08m×0.08m. The top of the prefabricated pile is fixedly connected to the node 2-1 of the rigid grid. The tension net is laid on the rigid grid structure, and a 0.6m thick gravel soil transition cushion is laid on the tension net. A grid 8 is arranged in the transition cushion. The fill soil 9 is filled on the transition cushion to form a subgrade project reinforced by a composite foundation of rigid grids and piles.

[0050] The specific construction steps are as follows:

[0051] (1) As shown in Figure 3, concrete prefabricated piles are laid on ...

Embodiment 2

[0056] As shown in Figure 1, the rigid grid and pile composite foundation consists of cast-in-place piles 1, rigid grid structure 2, tension bars 3, tension nets 4 and transition cushion 5. The cast-in-place piles pass through the soft soil layer 6 and are driven from the foundation surface to the relatively hard soil layer 7. The distance between the cast-in-place piles is 3.0m, and the cross-section of the cast-in-place piles is circular with a diameter of 0.40m. The top of the cast-in-place pile is fixedly connected to the node 2-1 of the rigid grid. Tension bars are laid on the rigid grid structure. Tension mesh is laid on the tension bars. A 1.0m thick gravel soil transition cushion is laid on the tension net. A grid 8 is arranged in the transition cushion. The fill soil 9 is filled on the transition cushion to form a subgrade project reinforced by a composite foundation of rigid grids and piles.

[0057] The specific construction steps are as follows:

[0058] (1) A...

Embodiment 3

[0063] As shown in Figure 1, the rigid grid and pile composite foundation consists of prefabricated piles 1, rigid grid structure 2, tension net 4 and transition cushion 5. The prefabricated piles pass through the soft soil layer 6 and are driven from the surface of the foundation to the relatively hard soil layer 7. The distance between the prefabricated piles is 2.5m. The prefabricated piles are H-section steel piles, the model is 300×300 ("Code for Design of Steel Structures" GB50017 -2003). The top of the prefabricated pile is fixedly connected to the node 2-1 of the rigid grid. The tension net is laid on the rigid grid structure, and a 1.0m thick gravel soil transition cushion is laid on the tension net. A grid 8 is arranged in the transition cushion. The fill soil 9 is filled on the transition cushion to form a subgrade project reinforced by a composite foundation of rigid grids and piles.

[0064] The specific construction steps are as follows:

[0065] (1) As shown...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a rigid grid and pile composite foundation and a method applied to reinforcing soft soil foundation. The rigid grid and pile composite foundation comprises a precast pile or a cast-in-situ pile, a rigid grid structure, a tensioning net, tensioning ribs and a transitional underlayer; the precast pile or the cast-in-situ pile drives to a relatively hard ground layer from a foundation surface layer; the rigid grid structure is fixedly connected with the precast pile; the grid structure is paved with the tensioning net; the tensioning net is provided with the transitional underlayer; the transitional underlayer is tightly contacted with the foundation surface, and the thickness of the transitional underlayer is between 0.6 and 1.5 meters; and the transitional underlayer is sandy clay, gravel soil or plain concrete with crude particles. The invention organically combines the rigid grid and the pile structure, the transitional underlayer and a soft ground layer to construct a composite foundation, transfers the load to a deep layer soil body through the grid structure and a pile, can give a full play to the strength and the deformation performance of the deep layer soil body, thereby effectively improving the foundation strength and the deformation performance, and having good reinforcing effect.

Description

technical field [0001] The invention relates to a soft soil foundation reinforcement structure, in particular to a rigid grid and pile composite foundation and a method for reinforcing the soft soil foundation using the same, which is applied to the fields of construction engineering, port engineering, highway engineering, railway engineering and the like. technical background [0002] my country has a vast territory, complex and changing geological conditions, and soft soil strata of various origins are widely distributed, especially in coastal areas, Yangtze River Delta and Pearl River Delta and other economically developed areas, where marine and lacustrine silt and silty soft soil are found. With the continuous and rapid development of my country's national economy, the scale of various construction projects is constantly expanding. During the construction of construction projects, port projects, highway projects, and railway projects, we often face the problem of soft so...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/22E02D3/00E02D27/12
Inventor 房营光莫海鸿潘卫东陈俊生谷任国
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products