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Composite foundation bearing structure imbedding precast piles in high pressure rotary jet pile

A technology of high-pressure rotary jetting piles and composite foundations, which is used in foundation structure engineering, foundation structure testing, sheet pile walls, etc., which can solve the damage of concrete at the top of piles, the low bearing capacity of reinforced soft soil foundations, and the large settlement and deformation of composite foundations. problems, to achieve the effect of increasing fluidity, reducing the effect of crowding, and improving physical and mechanical properties

Inactive Publication Date: 2020-06-23
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a composite foundation bearing structure in which prefabricated piles are placed in high-pressure rotary grouting piles, which fundamentally solves the soil squeezing effect in the process of sinking into prefabricated piles by traditional methods such as static pressure, hammering, and vibration. Avoid local damage to pile top concrete caused by excessive pile pressure force, hammering force, and vibration force during pile sinking; solve the problem of low bearing capacity and relatively large settlement deformation of composite foundations when using high-pressure rotary grouting piles alone to strengthen soft soil foundations The problem

Method used

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  • Composite foundation bearing structure imbedding precast piles in high pressure rotary jet pile
  • Composite foundation bearing structure imbedding precast piles in high pressure rotary jet pile
  • Composite foundation bearing structure imbedding precast piles in high pressure rotary jet pile

Examples

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Effect test

Embodiment 1

[0033] This example is a 28-storey high-rise building project, which adopts a frame structure, the center distance between the four adjacent column bases is 10m, the size of a single column base cap foundation 1 is 4.6×5.2m, and the buried depth of the cap is -2.5m , the vertical load transmitted from the upper structure to the cap at the lower end of the column, the standard value of the load is 24520kN, and the engineering geological data of the site foundation are shown in Table 1 below:

[0034] Table 1

[0035]

[0036] The design adopts a composite foundation bearing structure in which prefabricated piles are placed in high-pressure jet grouting piles, and the characteristic value of the bearing capacity of the composite foundation is required to reach 1025kPa. 8 high-pressure rotary grouting piles 3 constructed by the single-weight pipe method with an effective pile diameter of φ800mm are constructed by the single-weight pipe method high-pressure rotary grouting pile...

Embodiment 2

[0060] This embodiment is a 35-storey high-rise building project (1-storey basement), with a shear wall structure, a beam-slab type raft foundation 5, and a foundation beam 8 at the top of the raft foundation 5 . The burial depth of the 5 slabs of the raft foundation is -5.0m, and the plane size of the raft foundation 5 is taken as 4.5×8.0m. The standard value of the vertical load transmitted from the upper structure to the unit raft foundation 5 is 198000kN. See Table 2 below:

[0061] Table 2

[0062]

[0063] The design adopts the bearing structure of the composite foundation with prefabricated piles placed in the high-pressure rotary grouting piles, and the characteristic value of the bearing capacity of the composite foundation is required to be 550kPa. The high-pressure rotary grouting pile 7 constructed by the double pipe method with a pile diameter of φ1100mm using a high-pressure rotary grouting pile machine is 21m long. The effective pile diameter of the rotary ...

Embodiment 3

[0093] The present embodiment is a certain 38-storey high-rise construction project (2 floors basement), frame-shear structure, adopts box-shaped foundation 9, and the top of box-shaped foundation 9 is provided with inner partition wall 12. The burial depth of the box foundation plate is -8.0m, and the plane size of the unit box foundation 9 is 7.6×13.6m. The standard value of the vertical load transmitted from the superstructure to the unit box foundation is 41000kN. The engineering geological data of the site foundation are as follows table 3:

[0094] table 3

[0095]

[0096] The design adopts the composite foundation bearing structure with prefabricated piles placed in the high-pressure rotary grouting piles, and the characteristic value of the bearing capacity of the composite foundation is required to reach 435kPa. The high-pressure rotary grouting pile 11 constructed by the triple pipe method with a pile diameter of φ1800mm using a high-pressure rotary grouting pil...

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Abstract

The invention discloses a composite foundation bearing structure imbedding precast piles in a high pressure rotary jet pile. The composite foundation bearing structure comprises a high pressure rotaryjet pile cement soil solidifying body formed by forced mixing of cement soil curing agent slurry and foundation soil, the precast piles placed in the high pressure rotary jet pile cement soil solidifying body, and a reinforced concrete cushion cap or raft foundation, box foundation form arranged at the tops of the precast piles; and the water cement cement ratio of the cement soil solidifying agent preparation slurry is generally 0.7-1.1, and auxiliary materials and / or admixture are mixed in the slurry. The composite foundation bearing structure can significantly reduce the soil squeezing effect on the site foundation, increase the side resistance and end resistance standard value of the piles, enhance the bearing capacity characteristic value of foundation soil treated by the high pressure rotary jet pile, so that the bearing capacity of a composite foundation is improved. Through the optimization arrangement of the high pressure rotary jet pile and the reinforced concrete prefabricated piles, the settlement deformation of the foundation can be effectively controlled, and the cost of construction project can be reduced.

Description

technical field [0001] The invention relates to the technical field of building foundation engineering, in particular to a composite foundation bearing structure in which prefabricated piles are inserted into high-pressure jet grouting piles. Background technique [0002] In recent years, with the development of urban construction, reinforced concrete prefabricated piles have been widely used as the foundation of buildings, and cement-soil mixing piles are mainly used to strengthen soft soil foundations and form composite foundations with natural foundations. At present, reinforced concrete prefabricated piles are usually sunk to the design depth in the foundation by methods such as static pressure, hammering, and vibration. The solid prefabricated piles have a relatively large soil squeezing effect during the pile sinking process, especially in the silt and silty fine sand layers below the groundwater level. The rise will cause a greater soil squeezing effect, and the dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/50E02D3/00E02D3/08C04B28/04E02D33/00
CPCC04B28/04E02D3/00E02D3/08E02D5/50E02D33/00C04B18/08C04B22/124C04B24/122C04B22/147C04B22/00C04B2103/302
Inventor 代国忠李书进施维成史贵才李雄威李鹏波宋杨
Owner CHANGZHOU INST OF TECH
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