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Cement-soil mattress layer and construction method thereof in hydraulic engineering composite foundation

A construction method and composite foundation technology, which are applied in soil protection, infrastructure engineering, construction, etc., can solve problems such as difficulty in ensuring anti-seepage safety, and achieve the effects of good anti-seepage capability, convenient construction and small permeability coefficient.

Inactive Publication Date: 2019-05-10
JIANGSU PROVINCE WATER ENG SCI TECH CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For hydraulic structures using composite foundations, if the composite foundation uses crushed stone cushions, the cushions will become seepage channels, and it is difficult to guarantee the safety of seepage prevention. Therefore, it is urgent to develop a new type of cushion for this problem. Layer structure to meet the needs of actual use

Method used

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  • Cement-soil mattress layer and construction method thereof in hydraulic engineering composite foundation
  • Cement-soil mattress layer and construction method thereof in hydraulic engineering composite foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, a cement-soil cushion layer is composed of the following substances in mass percentage: 8% cement, and the balance is clay.

[0019] Wherein, the clay is a solid powder structure with a particle size not greater than 0.005 mm and a content of more than 50%.

[0020] A construction method of a cement-soil cushion layer in a composite foundation of a water conservancy project, comprising the following steps:

[0021] The first step is to excavate the foundation pit. First, excavate the foundation pit at the designated location according to the construction drawings, and compact the bottom of the foundation pit. Concrete precast pile foundations, followed by backfilling and compaction of the concrete precast piles;

[0022] The second step is to lay the cement-soil cushion layer, add cement, water and clay to the mixing equipment according to the proportion used for mixing, and then mix the mixed mixture with the foundation pit backfilled in th...

Embodiment 2

[0026] Such as figure 1 As shown, a cement-soil cushion layer is composed of the following substances in mass percentage: 18% cement, 10% water, and the balance is clay.

[0027] Preferably, the clay is a solid powder structure with a particle size not greater than 0.005 mm and a content of more than 50%.

[0028] A construction method of a cement-soil cushion layer in a composite foundation of a water conservancy project, comprising the following steps:

[0029] The first step is to excavate the foundation pit. First, excavate the foundation pit at the designated location according to the construction drawings, and compact the bottom of the foundation pit. Concrete precast pile foundations, followed by backfilling and compaction of the concrete precast piles;

[0030] The second step is to lay the cement-soil cushion layer, add cement, water and clay to the mixing equipment according to the proportion used for mixing, and then mix the mixed mixture with the foundation pit b...

Embodiment 3

[0035] Such as figure 1 As shown, a cement-soil cushion layer is composed of the following substances in mass percentage: 12% cement, 3% water, and the balance is clay.

[0036] In addition, the clay is a solid powder structure with a particle size not greater than 0.005 mm and a content of more than 50%.

[0037] A construction method of a cement-soil cushion layer in a composite foundation of a water conservancy project, comprising the following steps:

[0038] The first step is to excavate the foundation pit. First, excavate the foundation pit at the designated location according to the construction drawings, and compact the bottom of the foundation pit. Concrete precast pile foundations, followed by backfilling and compaction of the concrete precast piles;

[0039] The second step is to lay the cement-soil cushion layer, add cement, water and clay to the mixing equipment according to the proportion used for mixing, and then mix the mixed mixture with the foundation pit b...

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Abstract

The invention relates to a cement-soil mattress layer, which is prepared from the following substances in percentage by mass: 8 to 18 percent of cement, 0 to 10 percent of water and the balance of clay. A construction method in a hydraulic engineering composite foundation comprises the three steps of: excavation of a foundation pit, laying of the cement-soil mattress layer, and foundation construction. The structure is simple and compact in layout, convenient to construct and low in cost; the effect of adjusting stress distribution between pile soil can be achieved, and the defect that a traditional gravel mattress layer becomes a seepage channel is overcome due to the fact that a permeability coefficient of cement soil is small, and good seepage prevention capacity is achieved.

Description

technical field [0001] The invention relates to a cement-soil cushion layer and a construction method thereof in a composite foundation of a water conservancy project, belonging to the technical field of civil construction. Background technique [0002] Cushion layer is a method to adjust the stress distribution between pile and soil in composite foundation. The cushion layer is not only used for CFG piles, but also for gravel piles, pipe piles, etc. to form a composite foundation to ensure the joint action of piles and the soil between piles. [0003] In industrial and civil buildings, the cushion layer usually adopts a crushed stone cushion layer with a thickness of 0.1-0.3 meters. In water conservancy projects, such as sluices, pumping stations and other buildings, there is a certain water level difference between the upstream and downstream, and the anti-seepage stability is one of the factors that must be controlled in the design process. For hydraulic structures usin...

Claims

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Application Information

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IPC IPC(8): E02D27/12E02D3/00
Inventor 周喜武任玉彬陈学东周治刚左保静
Owner JIANGSU PROVINCE WATER ENG SCI TECH CONSULTING
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