Construction method for treating soft soil foundation by solidifying agent

A technology of weak soil foundation and construction method, applied in soil protection, infrastructure engineering, construction, etc., can solve problems such as the decline of curing effect, and achieve the effect of high construction efficiency, high strength, and good water stability

Active Publication Date: 2008-07-23
BEIJING ZHONGYONGJI FIRMING AGENT TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wet construction will not cause deterioration of the construction environment even if the surface silt layer is treated, but under the condition of more water, there are higher requirements for the

Method used

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  • Construction method for treating soft soil foundation by solidifying agent
  • Construction method for treating soft soil foundation by solidifying agent

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Tangshan Caofeidian Steel Factory North Road Section 2, the subgrade is silty sand, silty fine sand contains about 9% silty clay particles, silty fine sand contains about 30% saturated water, the surrounding environment makes the subgrade drainage difficult, and local subgrade surface water, The average daily temperature during construction is about 10 degrees Celsius. The imported excavator is equipped with an imported mixing head device, and a domestic slurry supply system is adopted. The slurry water-cement ratio is 0.5, the curing agent slurry delivery distance is more than 300 meters, and the design requires a consolidation depth of 0.8 meters. Add 7% powder, 3.5% water, and 0.07% commercially available concrete retarder to the silty fine sand consolidation body by weight percentage. The powder is composed of 70 parts of slag, 20 parts of fly ash, 5 parts of gypsum, 3 parts of anhydrous sodium sulfate, and 2 parts of sodium carbonate. The speed of mixing construct...

Embodiment 2

[0038] At the zero kilometer of Caofeidian North Ring Road in Tangshan, the subgrade is shallow beach silt, the thickness of the silt layer is about 1.5 meters, the moisture content of the silt is about 90%, and the surface bearing capacity of the original silt is less than 0.01Mpa. This area belongs to the intertidal zone, and the sea is deep when the tide is high. 30 cm, exposed to the water surface at low tide, the average daily temperature of the environment during construction is about 12 degrees Celsius; the imported excavator is equipped with a domestic mixing head device, and a domestic slurry supply system is adopted. The slurry water-cement ratio is 0.45, and the curing agent slurry delivery distance is 80 m; the depth of silt consolidation is 1.5 m. The powder is cement, and 4% of powder, 1.8% of water, 0.3% of liquid, and 0.03% of commercially available concrete retarder are added to the silt consolidated body by weight percentage. Wherein the liquid preparation is...

Embodiment 3

[0040] Tangshan Caofeidian Steel Factory North Road, the subgrade is silty sand, the silt fine sand contains about 18% silt clay, and the silt fine sand contains about 30% saturated water, and the local road is covered with water, and the daily average temperature during construction is about 10 degrees Celsius. Imported excavator is equipped with imported mixing head device, domestic pulping slurry supply system, slurry water-cement ratio is 0.5, curing agent slurry delivery distance is 200 meters, and the design consolidation depth is 0.8 meters. Percentage Add 7% powder, 3.5% water, 0.07% commercial concrete retarder. The powder is composed of the following components: 60 parts of slag, 33 parts of cement, 3 parts of gypsum, 2 parts of anhydrous sodium sulfate, and 2 parts of sodium carbonate. The construction speed is 80 cubic meters per hour. After mixing and construction, 30 cm of mountain soil is spread within 8 hours, and bulldozers are used to flatten and roll it. Af...

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Abstract

The invention relates to a construction method for processing soft soil foundation by using curing agent, which comprises the following steps: first, the curing agent and water are mixed into grout in appropriate proportion, the water in use can be river or lake water or even sea water; then, the grout is conveyed to a mixing machine at the construction position of the foundation, and directly injected into the soft soil with a high water content; simultaneously, the mixing machine is used to directly agitate the grout in situ until the grout is evenly mixed the entire soft soil foundation layer and consolidated into concretion body. The concretion body formed by the construction method can have a stronger bearing strength, and withstand the soaking or flushing of the sea water of river or lake water; under the condition of no water discharging, the concretion body can consolidate sludge and fine sands in situ; furthermore, the construction method for processing soft soil foundation by using curing agent, has the advantage of generating larger social benefits in terms of saving transportation resources, reducing the maintenance costs of the roads, minimizing the damage to environment due to cutting into mountains and crushing rocks, and accelerating the engineering construction.

Description

technical field [0001] The invention relates to a construction method for foundation treatment of roadbed or embankment engineering, in particular to a construction method for treating relatively shallow silt and fine sand foundations with a curing agent. Background technique [0002] With the rapid development of my country's national economy, the construction land is becoming more and more scarce. Sub-resources such as silt and fine sand that are often discarded in traditional building construction have become more and more usable resources through the use of new technologies. and environmental protection departments. [0003] Silt and silty sand are bad materials for construction. The former has low bearing capacity and large settlement, while the latter is prone to liquefaction under dynamic load. Traditional construction often adopts the method of replacement and filling, and silt squeezing is a common construction method in engineering. Use sand and gravel materials to...

Claims

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Application Information

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IPC IPC(8): E02D3/12
Inventor 刘曰键孙建国梁力民王展国
Owner BEIJING ZHONGYONGJI FIRMING AGENT TECH DEV
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