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Sludge superficial layer curing agent solidification continuous construction method

A construction method and curing agent technology, applied in infrastructure engineering, soil protection, construction, etc., can solve the problems of long processing period, foundation bearing strength not meeting the design requirements, low technical comparability, etc., and achieve flexible and simple construction cost effective effect

Active Publication Date: 2017-12-26
BEIJING ZHONGYONGJI FIRMING AGENT TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Vacuum preloading is often used in the treatment of large-area silt soft foundations, but the treatment period is too long, and some mountain stones are used, so it is difficult to treat very fine silt particles, and the bearing strength of the foundation may not meet the design requirements. The technical comparability of the present invention is not high

Method used

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  • Sludge superficial layer curing agent solidification continuous construction method
  • Sludge superficial layer curing agent solidification continuous construction method
  • Sludge superficial layer curing agent solidification continuous construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The subgrade construction of Shuichang Road in Caofeidian Development Zone, Hebei Province adopts the continuous construction technology of curing agent shallow surface layer consolidation. The subgrade is 40 meters wide and 1,000 meters long, and the depth of the solidified layer is required to be 1.5 meters. The soft foundation is composed of powder and fine sand mixed with some silt, with a saturated water content of 24%, fine-grained soil accounting for 35%, and a wet density of 1.87g / cm 3 . Add 10% of the curing agent in Example 10 of the invention patent CN101684038A; use the bucket of an ordinary excavator to stir the sludge and the curing agent; The construction surface is used as the operation platform, and the adjacent areas are continued to be treated in the same way according to the block-by-block well-shaped construction method. On-site testing of the unconfined compressive strength of the solidified soil soaked in water for 7 days is greater than 0.8Mpa, ...

Embodiment 2

[0057] The subgrade and green area of ​​Dongdi Road in Tianjin Sino-Singapore Eco-city adopt the continuous construction technology of curing agent shallow surface layer consolidation. The soft foundation in this area is dredged fill soil that has been placed for 1.5 years, and the silt layer is 11 meters deep. The project volume is large and the treatment is complicated. Among them: the subgrade is 18 meters wide and 3,800 meters long, curved, and the consolidated soil thickness is 1.5 meters; the green belt area is 130 meters wide and 3,400 meters long, and the required consolidation thickness is 1 meter. In the soft foundation, deep foundation pit pipe trench construction is also required, the deepest depth is 5.5 meters, and it is constructed with solidified soil. The construction is completed by the excavator equipped with a long-axis screw propeller mixing head.

[0058] Get the silt with moisture content of 65-90%, carry out the experiment of adding amount and unconfined...

Embodiment 3

[0064] Shallow surface solidification agent consolidation technology is adopted for the silt soft foundation of Jiaojiang Eleven Pond, Taizhou City, Zhejiang Province. The treatment area is 200×200 meters, the consolidation depth is 1.5 meters, the silt deposit layer is 9 meters deep, the moisture content is 55%, and the wet density is 1.68g / cm 3 .

[0065] The curing agent in Example 9 of the invention patent CN101684038A is mixed with 10%, and the excavator bucket is equipped with a short-axis screw agitator for stirring and compacting, and the construction method of block-by-block construction is continued to remove the sludge in the adjacent area. Do the same. After 14 days, through the shallow plate load test, the characteristic value of the bearing capacity is 150-220Kpa, the deflection value of the deflection test is not greater than 26.8×0.01mm, and the unconfined compressive strength of the site sampling test is greater than 1.14Mpa.

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Abstract

The invention discloses a sludge superficial layer curing agent solidification continuous construction method. The curing agent and the sludge are uniformly stirred, then the construction surface is compacted by using stirring equipment, the compacted construction surface is a construction unit, an iron plate is laid below an excavator, the construction unit serves as an operation platform, and the sludge in connected areas is continuously processed according to a construction mode of block-by-block construction and a well-shaped propulsion. The sludge solidification structure with relatively low water content in china is to being buried in different places after being treated, a shallow-layer sludge consolidation continuously construction method is adopted in foreign countries, but geotechnical cloth, gravel and boards need to be laid on the surface of the solidified sludge so that the continuously construction can be carried out, the construction method only has the transverse construction and no the longitudinal construction, and the plate body stabilization layer is not provided with a plate frame structure. According to the construction method, with the water content of more than 130%, the transverse and longitudinal construction method is adopted to realize the shallow-layer sludge consolidation continuous plate frame structure construction, and the construction is more flexible, simple and effective compared with the foreign countries.

Description

technical field [0001] The invention relates to a continuous construction method for consolidating a silt superficial layer with a solidifying agent, and belongs to the technical field of large-area soft soil foundation treatment. Background technique [0002] One of the commonly used construction methods for building fields and roads on soft ground is to squeeze and silt the mountain soil. With the rapid development of national economic construction, the contradiction between the demand for construction land and the occupation of cultivated land has become increasingly prominent. In order to protect people's livelihood, the state has set a red line of 1.8 billion mu of cultivated land, and builders have to turn their attention to rivers, lakes, seas depositional place. The silt layer of marine deposits is tens of meters deep, and the silt depth of artificial dredged soft foundation is also nearly 10 meters. This kind of silt foundation has extremely low bearing capacity an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12
CPCE02D3/12E02D3/123
Inventor 孙建国刘曰键李伟宁王涛
Owner BEIJING ZHONGYONGJI FIRMING AGENT TECH DEV
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