Supporting design and construction method of foundation pit supporting system
A construction method and technology of foundation pit support, applied in the direction of infrastructure engineering, excavation, construction, etc., can solve the problems of increasing construction difficulty, affecting the construction speed of underground structures, construction quality and structural integrity, and limiting the promotion and application of diagonal support systems And other issues
Inactive Publication Date: 2010-11-17
济南鼎汇土木工程技术有限公司 +3
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Problems solved by technology
However, the current conventional method of removing diagonal braces is to wait until the underground structure is constructed first and the braces are replaced before the braces can be removed. This has to leave holes in the outer walls and floors of the underground struc
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Embodiment 1
[0047] The support form of the foundation pit is row pile retaining wall, the internal support form is concrete diagonal brace, and the concrete strength of row pile, crown beam and diagonal brace is C40. The diameter of the supporting pile is 800mm, the distance between the centers of the piles is 1200mm, and the length of the supporting pile is 22.1m. The cross-section of diagonal braces is 1200mm×800mm, there are 174 pieces in total, the length is 16m, and the cross-section of the crown beam is 1200mm×1500mm. The excavation form of the foundation pit is generally approximately rectangular, with a plane dimension of about 353.00m in length from east to west and about 189.0m in width from north to south. Due to the control of the building's red line, the surrounding environment does not allow the use of external anchors.
[0048] E determined according to the aforementioned method g ,E hz and E z is 31500Mpa; I gz is 0.216×10 12 mm 4 , I hzyand I zy is 0.02×10 12 mm...
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The invention relates to a supporting design and construction method of a foundation pit supporting system. In the method, a 'detaching-supporting' segmental diagonal bracing detachment mode is adopted when the diagonal bracings of a foundation pit supported by row pile bracings are detached. In construction, the maximum segmental length L to be detached is determined first, then the diagonal bracings are detached segment by segment according to range of the length, and finally, an underground structure is constructed segment by segment. Thus, hole making in the underground is avoided, the negative influences of a bracing detachment stage on the construction of the underground structure are avoided while the advantages of the diagonal bracing supporting system are fully utilized, the safety of the construction is ensured by the adoption of a minimum potential energy theory which takes spatial cooperation deformation into consideration in the calculation of the length of the diagonal bracings detached segment by segment, and the use of the diagonal bracings in foundation supporting is promoted.
Description
technical field [0001] The invention relates to the field of construction engineering, in particular to a design and construction method for dismantling and supporting a foundation pit support system. Background technique [0002] The foundation pit engineering mainly includes the design, construction and monitoring of the foundation pit support system, which is a highly comprehensive system engineering. The excavation of the foundation pit will inevitably cause the change of the stress field, resulting in the displacement of the surrounding strata, which will have an impact on the surrounding buildings (structures) and pipelines, and seriously endanger its normal use or safety. In order to avoid this situation, foundation pit support The system is of great significance to foundation pit engineering. [0003] There are two main forms of internal support in deep foundation pit support, namely flat support and diagonal support. Flat braces are widely used at present, but bec...
Claims
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Inventor 刘俊岩刘燕
Owner 济南鼎汇土木工程技术有限公司