Foundation pit support method of soft soil foundation

A technology for foundation pit support and soft soil foundation, which can be used in soil protection, excavation, infrastructure engineering, etc., and can solve the problem of high cost

Inactive Publication Date: 2010-10-13
范娟娟
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Problems solved by technology

The cost of doing this is high, and it does not change the physical properties of the soft soil on both sides. In order to reduce the post-construction settlement of the ground roads on both sides, it is still necessary to deal with the soft soil subgrade of the ground roads on both sides, that is, for soft soil foundations and foundation pits Support is handled separately

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  • Foundation pit support method of soft soil foundation
  • Foundation pit support method of soft soil foundation
  • Foundation pit support method of soft soil foundation

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with accompanying drawing description and specific embodiment:

[0028] Such as Figure 2 to Figure 8 As shown, the first step of vacuum preloading foundation pit support is to install cement-soil mixing piles at the corresponding positions of the ground roads on both sides of the underpass section, and the cement-soil mixing piles enclose and divide the soft soil road section into multiple closed areas; figure 2 In the middle, it is divided into the closed area 3 of the underpass section in the middle, and the closed areas 1, 2, 4, and 5 of the ground roads on both sides. The arrow indicates the forward direction of the underpass road. During specific implementation, the 850mm cement-soil mixing piles should interlock with each other to play a sealing role, so as to maintain a high degree of vacuum, so that the vacuum preloading support can be implemented smoothly.

[0029] The division of...

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Abstract

The invention discloses a foundation pit support method of soft soil foundation. Vacuum preloading is carried on soft soil road sections as the foundation pit support is carried on undercrossing construction of the soft soil highway. The construction steps are as follow: firstly, cement-soil mixing piles are erected at the corresponding positions on ground at two sides of the undercrossing road section and the soft soil road section is divided into a plurality of closed areas by the cement-soil mixing piles; plastic drainage plates are erected in a certain space in each closed area; sand cushion is paved on the ground in each closed area and a filter strainer is embedded in the sand cushion; the sand cushion is covered by a sealing film so as to be separated from air; a vacuum pump is communicated with the filter strainer in the sand cushion and exhausts to discharge air in the sealing film; finally, vacuum value in the sealing film is kept to be more than 80 KPa. As the preloading of undercrossing road section is stopped, the foundation degree of consolidation is required to be more than 80% and then foundation pits in the undercrossing road section are excavated and parapets in the undercrossing road section are set.

Description

technical field [0001] The invention relates to a method for supporting foundation pits in road construction, in particular to a method for supporting foundation pits on soft soil road sections. Background technique [0002] With the development of the national economy, people increasingly need fast and convenient transportation, so road rapid reconstruction projects are increasing, and the underpass scheme is more and more popular because it has less impact on the appearance. For underpass construction in soft soil road sections, foundation pit support is required. The foundation pit support under the road project has its particularity. The depth of the foundation pit is mostly between 7 and 9m, and there are ground roads on both sides of the underpass. [0003] At present, the methods used for foundation pit support in soft soil road sections mainly include: SMW pile support, cement-soil mixing pile support, and pouring pile support. The principle is to use support to bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D17/20E02D3/10
Inventor 范娟娟
Owner 范娟娟
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