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Multi-variable-diameter high pressure jet grouting pile-multi-variable-diameter powder spraying pile composite foundation structure suitable for deep soft soil and construction method thereof

A technology of high-pressure rotary grouting piles and composite foundations, which is applied in foundation structure engineering, sheet pile walls, soil protection, etc., can solve the problem of unreasonable balance between project cost and post-construction settlement, limited treatment depth and effective reinforcement depth, etc. Large post-construction settlement and other problems, to achieve the effect of increasing pile-soil anchorage effect, improving soft soil replacement rate, and large post-construction settlement

Pending Publication Date: 2019-11-29
TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the construction of high-speed railways or bridge-tunnel transition sections of railways and highways in deep soft soil areas, for projects with high bearing capacity requirements and strict post-construction settlement control, the drainage consolidation method is used for long construction periods and large post-construction settlements, and soil replacement cushions are used for filling. Due to the limited treatment depth and effective reinforcement depth of the method and the dynamic compaction method, the traditional immersed tube compacted gravel pile method, the cement fly ash immersed tube compacted gravel pile (CFG) method and the mixing pile method are of great importance in project cost and construction. Post-settlement cannot be reasonably balanced

Method used

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  • Multi-variable-diameter high pressure jet grouting pile-multi-variable-diameter powder spraying pile composite foundation structure suitable for deep soft soil and construction method thereof
  • Multi-variable-diameter high pressure jet grouting pile-multi-variable-diameter powder spraying pile composite foundation structure suitable for deep soft soil and construction method thereof
  • Multi-variable-diameter high pressure jet grouting pile-multi-variable-diameter powder spraying pile composite foundation structure suitable for deep soft soil and construction method thereof

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Experimental program
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Effect test

Embodiment 1

[0059] A composite foundation structure suitable for deep soft soil, multi-variable diameter high-pressure jet grouting pile-multi-variable diameter powder spray pile, including soft soil foundation 502, multi-variable diameter high-pressure jet grouting pile 1, multi-variable diameter powder jet pile 2, and cushion layer 3 , three-way grid 4 and road basic body 501, in the soft soil foundation 502, there are multiple variable diameter high pressure rotary grouting piles 1 and multiple variable diameter powder spraying piles 2, and multiple variable diameter high pressure rotary grouting piles 1 and multiple variable diameter powder spraying piles The piles 2 are arranged at intervals in the soft soil foundation 502, the length of the multi-variable diameter powder jet pile 2 is 1 / 2 of the length of the multi-variable diameter high-pressure rotary grouting pile 1, and the cushion layer 3 is laid on the surface of the soft soil foundation 502. A three-way grid 4 is set above the...

Embodiment 2

[0091] The difference from Embodiment 1: Multi-variable diameter high-pressure jet grouting piles 1 are arranged at equal intervals outward from the center line of the soft soil foundation 502 to the inside of the road shoulder, and multi-variable diameter powder spray piles 2 are arranged on the road shoulder. Both the high-pressure rotary grouting pile 1 and the multi-variable diameter powder spraying pile 2 are arranged in a square shape. The diameter of the upper diameter expansion section 6 is 900mm, the height of the upper diameter expansion section 6 is 2m, the diameter of the middle diameter expansion section 8 is 900mm, and the middle diameter expansion section The height of the diameter section 8 is 2m, the diameter of the bottom expansion section 10 is 900mm, the height of the bottom expansion section 10 is 2m, and the diameter of other parts of the multi-diameter high-pressure jet grouting pile 1 is 500mm.

[0092] The diameter of the top expansion section 12 is 900...

Embodiment 3

[0096] The difference from Embodiment 1: N is equal to 2, the diameter of the upper diameter expansion section 6 is 950mm, the height of the upper diameter expansion section 6 is 2.5m, the diameter of the middle diameter expansion section 8 is 950mm, and the diameter of the middle diameter expansion section 8 is The height is 2.5m, the diameter of the bottom expansion section 10 is 950mm, the height of the bottom expansion section 10 is 2.5m, and the diameter of other parts of the multi-variable high-pressure jet grouting pile 1 is 500mm; the diameter of the top expansion section 12 is 950mm, the height of the enlarged diameter section 12 at the top is 2.5m, the diameter of the enlarged diameter section 13 at the bottom end is 950mm, the height of the enlarged diameter section 13 at the bottom end is 2.5m, and the pile body diameters of other parts of the multi-variable diameter powder spraying pile 2 are 500mm; the thickness of cushion layer 2 is 50cm.

[0097] Further, the d...

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Abstract

The invention provides a multi-variable-diameter high pressure jet grouting pile-multi-variable-diameter powder spraying pile composite foundation structure suitable for deep soft soil and a construction method thereof. Multi-variable-diameter high pressure jet grouting piles and multi-variable-diameter powder spraying piles are arranged in a soft soil foundation, the multi-variable-diameter highpressure jet grouting piles and the multi-variable-diameter powder spraying piles are arranged at intervals in the soft soil foundation or the multi-variable-diameter high pressure jet grouting pilesare arranged at an equal interval outward from the center line of the soft soil ground to the inner side of a road shoulder, the multi-variable-diameter powder spraying piles are arranged at the roadshoulder, the length of the multi-variable-diameter powder spraying piles is 1 / 2-1 / 3 of the length of the multi-variable-diameter high pressure jet grouting piles, a cushion layer is laid on the surface of the soft soil foundation, a three-way grille is arranged above the cushion layer, and a roadbed body is arranged on the three-way grille. According to the multi-variable-diameter high pressure jet grouting pile-multi-variable-diameter powder spraying pile composite foundation structure, the settlement after construction can be effectively controlled by arranging the multi-variable-diameter high pressure jet grouting piles into a soil layer with low compressibility, by arranging the multi-variable-diameter powder spraying piles, the replacement rate of upper soft soil is increased, the bearing capacity of foundation soil is improved, and the construction cost is effectively controlled.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation treatment in geotechnical engineering, and more specifically relates to a multi-variable-diameter high-pressure rotary grouting pile-multi-variable-diameter powder-jet pile composite foundation structure and a construction method for deep soft soil. Background technique [0002] With the development of the economy and the growth of the population, countries all over the world are constantly carrying out land reclamation from the sea. The coastal areas of our country have formed a large number of land reclamation areas through reclamation from the sea. The newly dredged silt is characterized by high water content, high void ratio, low strength, poor structure, and large settlement deformation. In order to meet the needs of engineering construction, it is usually necessary to treat soft soil. At present, the treatment methods for soft soil foundations include: drainage consolidation me...

Claims

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Application Information

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IPC IPC(8): E02D5/46E02D5/48E02D3/00
CPCE02D5/46E02D5/48E02D3/00
Inventor 张瑞棋诸葛爱军刘文彬朱洪满朱胜利陈运涛于健尹自强李彪王闯王世宁
Owner TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG