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Muddy soil cement grout applied to vertical shaft part of pedestrian underpass in saturated soft clay region

A soft clay and cement technology, applied in the field of reinforced material-saving cement, can solve the problems of slow construction speed and limited application scope, and achieve the effect of saving construction period, reducing land subsidence and reducing impact

Active Publication Date: 2011-04-27
博地建设集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For saturated soft clay areas, especially the southeast coastal areas dominated by silt soil, due to the influence of special geological conditions and high groundwater level, the application range of shallow buried underground excavation method is limited to a certain extent, and the construction speed is relatively slow

Method used

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  • Muddy soil cement grout applied to vertical shaft part of pedestrian underpass in saturated soft clay region
  • Muddy soil cement grout applied to vertical shaft part of pedestrian underpass in saturated soft clay region
  • Muddy soil cement grout applied to vertical shaft part of pedestrian underpass in saturated soft clay region

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Embodiment 1

[0043] The soil samples were taken from a construction site in Ouhai District, Wenzhou City, and the silt soil samples buried at a depth of 4.05m were taken and combined with five chemical additives such as triethanolamine, calcium lignosulfonate, calcium chloride, magnesium chloride, and alum to form 3 a compound admixture py １ 、py 2 、py ３, combined with 4 kinds of external admixtures (admixture 1, external admixture 2, external admixture 3, external admixture 4) formed by 3 kinds of chemical materials such as water glass, raw gypsum powder, and silicon powder, and then mixed with wet 15%, 18%, and 21% of the soil weight are combined in various proportions. Considering that the on-site construction is to spray cement slurry into soft soil, the water-cement ratio of 0.80 is only used for construction. After the cement slurry is sprayed into soft soil and mixed, the real water-cement ratio of cement soil is close to the water content of silt soil and the cement content. The...

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Abstract

The invention discloses a muddy soil cement grout and a composite additive applied to a vertical shaft part of a pedestrian underpass in a saturated soft clay region. A large number of indoor orthogonal tests show that the compression resistance and the shear resistance of muddy cement soil can be greatly improved by adding a plurality of composite admixtures and composite additives into Wenzhou soft cement soil of which the main component is muddy soil. The finding has great significance for constructing the vertical shaft part of the pedestrian underpass in an urban water-rich soft soil region. On the basis of the large number of indoor orthogonal tests, a new economical soft soil reinforcing formula of the vertical shaft part in the water-rich soft soil region, which is constructed by a shallow tunneling method, is found. By the pre-grouting method using the new formula, the geological conditions of the water-rich soft soil shallow-buried soil layer can be effectively improved and the smooth completion of constructing the pedestrian underpass by the shallow tunneling method is reliably guaranteed.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to the field of an economical, efficient and reliable soft soil support and reinforcement technology for the treatment of saturated soft clay foundations in municipal engineering, foundation pit engineering, and port and wharf engineering, in particular to a new technology applicable to Reinforced material-saving cement for grouting grouting in silt soil of the shaft part in the shallow burial and underground excavation method of pedestrian crossing tunnels in urban soft soil stratum. Background technique [0002] my country's infrastructure construction has entered a period of great development, urban construction in soft soil areas is developing rapidly, and people are paying more and more attention to the development and utilization of underground space. Underground spaces of various forms and uses are being developed and utilized in major cities around the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/26C04B28/02
Inventor 潘林有余闯吴荷君钱国锋
Owner 博地建设集团有限公司
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