Foundation pit support system with firstly-supporting and secondly-digging construction method piles combined with inclined piles

Abstract

The invention relates to a foundation pit support system with piles combined with inclined piles in a supporting-before-digging construction method, which comprises two rows of water-soil mixing piles, H-shaped steel inserted in the piles, coping ring beams and connecting beams of front and rear rows of piles, an upper inclined inclined pile and a lower inclined inclined pile, the inclined pile can be H-shaped steel, a steel pipe, a hollow square pile, a hollow pipe pile, a solid square pile, a water stop groove square pile, a water stop groove circular pile and the like; the deep foundation pit supporting type means that the supporting type can be applied to deep foundation pits of two underground layers. The raking piles are embedded in the coping ring beam, and when the raking pile bodies are H-shaped steel or steel pipes, pre-embedded steel plates can be arranged on the coping ring beam to serve as welding connection measures; meanwhile, in order to prevent the inclined piles from passing through the intersection point of the floor slab and the outer wall in the basement, the vertical angles of the inclined piles can be adjusted within 15-50 degrees; the inclined pile can be pressed into a guide hole of the high-pressure jet grouting pile through a special construction machine and then inserted into the guide hole. The invention has the advantages that the portal frame structure is H-shaped steel, the inclined piles can be directly used and can be bought in the market, and the portal frame is convenient and fast to construct, low in manufacturing cost, energy-saving, environment-friendly, few in technical difficulty and convenient to popularize; meanwhile, the structure has multiple functions of reinforcement, skid resistance, soil retaining and water stopping, and can be used for deep foundation pit supporting of two underground layers.

Description

technical field [0001] The invention belongs to the technical field of foundation pit engineering, and in particular relates to a foundation pit enclosure system in which piles are braced first and then excavated with piles combined with inclined piles. Background technique [0002] The support type of the existing two-story basement foundation pit is mainly row piles + two supports, and the horizontal support generally adopts reinforced concrete internal support or steel support (steel tube support, H-shaped steel support, prestressed fish-belly beam internal support, etc. ), the lower part of the support is provided with upright columns, and the supports are different, and the number of upright columns is more or less, which makes the construction operation surface of the foundation pit narrow and small, and the excavation of earthwork in the pit is difficult, which seriously affects the total construction period. Finally, the removal of horizontal support is also a factor...

AI Technical Summary

Problems solved by technology

[0002] The support type of the existing two-story basement foundation pit is mainly row piles + two supports, and the horizontal support generally adopts reinforced concrete internal support or steel support (steel tube support, H-shaped steel support, prestressed fish-belly beam internal support, etc. ), the lower part of the support is provided with upright columns, and the supports are different, and the number of upright columns is more or less, which makes the construction operation surface of the foundation pit narrow and small, and the excavation of earthwork in the pit is difficult, which seriously affects the total construction period. Finally, the removal of horizontal support is also a factor affecting the construction progress; in addition, the cost of horizontal support, columns, and column piles is relatively high, which can account for more than half of the total cost of foundation pit support

[0003] In summary, there is currently no more economical, safe, energy-saving, environmentally friendly, and quick construction enclosure method for the foundation pit of the two-story basement. With this as the goal, the present invention provides a possible

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