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Pre-hole-forming padding substitution hammer flattener dynamic compaction method

A technology of pre-forming holes and dynamic tamping, which is applied in the fields of soil protection, construction, and infrastructure engineering, etc. It can solve problems such as difficulty in effectively landing the bottom, and achieve the effects of short construction period, remarkable treatment effect and low cost

Active Publication Date: 2015-06-24
CHINA ZHONGHUA GEOTECHN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of dynamic compaction replacement construction, ultra-high pore water pressure is formed at the top of the underlying hard layer, resulting in about 1m of saturated soft soil remaining below the bottom of the replacement pier, making it difficult to reach the bottom effectively

Method used

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  • Pre-hole-forming padding substitution hammer flattener dynamic compaction method
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  • Pre-hole-forming padding substitution hammer flattener dynamic compaction method

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Embodiment Construction

[0056] see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 Shown:

[0057] A pre-formed hole filling replacement flat hammer dynamic compaction method, which pre-forms holes before dynamic compaction construction:

[0058] Holes are formed in the foundation soil by drilling machines such as rotary drilling rigs and long auger drilling rigs;

[0059] Directly penetrate the soft soil layer to the top surface of the underlying hard layer or enter the underlying hard layer.

[0060] It forms a loose displacement pier before dynamic compaction construction:

[0061] Fill the hole with stones, gravel, coarse sand and other materials;

[0062] Continuously backfill to the elevation of the orifice to form a loose replacement pier;

[0063] The loose replacement pier is a good drainage channel, which is conducive to accelerating the consolidation of soft soil;

[0064] The loose replacement pier is in good contact with the underlying hard layer.

[0065] It uses dynam...

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Abstract

The invention provides a pre-hole-forming padding substitution hammer flattener dynamic compaction method, by means of the method, partial substitution to a soft soil foundation is achieved, and a substitute mound body is in good contact with an underlying hard layer. The method comprises the following steps: 1, pre-forming a hole in foundation soil; 2, filling the hole with materials till the ground surface is reached; 3, conducting hammer flattener local compaction construction to filler at the ground surface, wherein a drum-shaped compact mound body with upper end large is formed; 4, after conducting backfill and flattening the field, adopting full compaction for further consolidating inter-mound soil bodies and superficial soil bodies; 5, laying a cushion layer. The method has the advantages that the partial substitution treatment can be conducted to the deep foundation of a type such as saturated clayey soil, sludge, mucky soil or a weak intercalated layer, according to the depth, dynamic compaction which is different in energy level is applied to a substitute body, the compact mound body is formed, the cushion layer is laid, the composite foundation is formed, and meanwhile the method has the advantages of being convenient in construction, low in construction cost, short in construction duration, environment protective, high in foundation bearing capacity and small in sedimentation deformation.

Description

technical field [0001] The invention relates to the technical field of foundation treatment, which is a flat hammer dynamic compaction method for pre-forming hole filler replacement, and is a foundation treatment technology for deep-layer high-energy level reinforcement of saturated cohesive soil, silt, silty soil, weak interlayer and other types of foundations. The treatment depth is generally 6-15m, and the construction energy level of dynamic compaction is generally 8000kN.m-18000kN.m. Background technique [0002] The ground treatment technology of the dynamic compaction method is to use a large crawler crane to freely drop a heavy hammer of a certain mass from a certain height to compact the soil strongly. It is suitable for treating gravel soil, sandy soil, silt and clayey soil with low saturation, collapsible loess, miscellaneous filling soil and plain filling soil and other foundations. For foundations with poor permeability such as saturated cohesive soil, silt, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/08
Inventor 柴俊虎高斌峰张仲道董炳寅刘波牟建业赵永祥尹昭张新蕊赵锋
Owner CHINA ZHONGHUA GEOTECHN ENG
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