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Retaining and protecting method for vacuum preloading foundation excavation at soft soil road section

A foundation pit support and soil road technology, applied in soil protection, excavation, foundation structure engineering, etc., can solve the problem of high cost, achieve the effect of increasing strength, increasing effective stress, and increasing self-supporting performance

Inactive Publication Date: 2010-07-07
黄正荣
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is expensive and does not change the physical properties of the soft soil on both sides, and 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

Method used

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  • Retaining and protecting method for vacuum preloading foundation excavation at soft soil road section
  • Retaining and protecting method for vacuum preloading foundation excavation at soft soil road section
  • Retaining and protecting method for vacuum preloading foundation excavation at soft soil road section

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the description of the drawings and the specific embodiments:

[0037] Such as Figure 3 to Figure 9 As shown, image 3 This is a schematic plan view of the enclosed area enclosed by the cement-soil mixing pile of the present invention; the first step of vacuum preloading foundation pit support is to set up cement-soil mixing piles at the corresponding positions on the ground roads on both sides of the underpass, and the cement-soil mixing piles Dirt road sections are enclosed and divided into multiple enclosed areas; image 3 In the middle, it is divided into the middle underpass closed area 3, and the ground road closed areas 1, 2, 4, 5 on both sides. The arrow indicates the forward direction of the underpass. In the specific implementation, the 850mm cement-soil mixing piles should be interlocked with each other to play a role of sealing, so that a high vacuum degree can be maintained, s...

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Abstract

The invention discloses a retaining and protecting method for a vacuum preloading foundation excavation at a soft soil road section, which is used for vacuum preloading for the soft soil road section when in the retaining and protecting for the foundation excavation in the underpass construction of the soft soil road section. In the method, firstly, cement mixing piles are piled at the corresponding positions of the ground level road at the two sides of an underpass section and are used for enclosing and dividing the soft soil road section into a plurality of closed regions, plastic drainage boards are piled in each closed region at a certain interval, a sand cushion is laid at the ground of the closed region and is internally embedded with a strainer, and the sand cushion is covered by a sealing film to be isolated from atmosphere; then, a vacuum pump is communicated with the strainers in the sand cushion and exhausts the air in the sealing film; finally, the vacuum degree in the sealing film can be kept to be more than 80KPa; the degree of consolidation of the foundation is more than 80% when stopping the preloading for the underpass section, then the foundation excavation is excavated by the underpass section, and a retaining wall of the underpass section is arranged.

Description

Technical field [0001] The invention relates to a foundation pit support method in road construction, in particular to a method for vacuum pre-compression foundation pit support for soft soil road sections. Background technique [0002] With the development of the national economy, people increasingly need fast and convenient transportation, so there are more and more rapid road reconstruction projects, and the underpass scheme is more and more favored because of its less impact on the appearance. Underpass construction in soft soil sections requires foundation pit support. The underpass foundation pit support of highway engineering has its particularity. The depth of the foundation pit is mostly between 7-9m, and there are ground roads on both sides of the underpass. [0003] At present, the main methods used for foundation pit support in soft soil sections are: SMW construction method pile support, cement-soil mixing pile support, and grouted pile support. The principle is that...

Claims

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Application Information

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IPC IPC(8): E02D3/10E02D17/02E02D17/20
Inventor 黄正荣
Owner 黄正荣
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