Inner support free supporting method for top sloping of soft soil foundation pit
A technology for foundation pit and soft soil, applied in excavation, infrastructure engineering, construction, etc., can solve the problems of reducing the excavation efficiency in the foundation pit, interfering with the construction of the underground structure, and increasing the project cost, so as to improve the construction efficiency, reduce the project cost, The effect of eliminating distractions
Inactive Publication Date: 2019-01-01
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology
The internal support system is composed of column piles, columns and horizontal support beams, which increases the cost of the project and reduces the excavation efficiency in the foundation pit
In addition, with the construction of the underground structure, the internal support also needs to be removed layer by layer, which affects the environment and interferes with the construction of the underground structure
Method used
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Embodiment 1
[0072] Embodiment 1, the non-inner support method of grading at the top of the soft soil foundation pit, such as figure 1 and 2 As shown, in the soft ground layer 7, excavating a foundation pit with a depth of H includes the following steps in sequence:
[0073] S1. Set vertical body I1 and vertical body II2 according to the actual needs of construction:
[0074]Set vertical body I1 on the side to be excavated in soft soil foundation pit, the length of vertical body I1 is L 1 , the top of the vertical body I1 is located at the depth a6 below the ground 9;
[0075] Vertical body II2 is set on the outside, and the length of vertical body II2 is L 2 ; The top of the vertical body Ⅱ2 is flush with the ground 9, and L 2 less than or equal to L 1 +a6, the vertical body I1 is parallel to the vertical body II2, and the horizontal distance is s1.
[0076] Note: The above-mentioned outside refers to the outside of the soft soil foundation pit, that is, the soft soil foundation pit...
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The invention provides an inner support free supporting method for top sloping of a soft soil foundation pit. The method comprises the following steps that S1, a vertical body I and a vertical body IIare arranged, the top end of the vertical body I is located at the position below the ground, the distance between the position and the ground is depth a6, and the top end of the vertical body II isflushed with the ground; S2, a buttress is arranged; S3, an inclined strut assembly is arranged and is composed of at least two inclined struts sequentially arranged in the length direction of the foundation pit, the top ends of the inclined struts and the top end of the vertical body II are connected on the ground, and the bottom ends of the inclined struts are connected with the vertical body I;S4, a cable-stayed part assembly is arranged and is composed cable-stayed parts in one-to-one correspondence to the inclined struts, the top ends of the cable-stayed parts are connected with the topend of the vertical body I, the cable-stayed parts cross with the vertical body II at points A, and the inclined struts and the cable-stayed parts cross at points B; and S5, horizontal part assembliesare arranged, the foundation pit with the depth being H is excavated on the ground downwards, and n layers of horizontal part assemblies are sequentially arranged from top to bottom at the position away from the ground by depth a4+a6 while excavation is carried out.
Description
technical field [0001] The invention relates to a method for supporting a foundation pit in the field of civil engineering, in particular to a method for supporting a foundation pit in soft soil without internal support. Background technique [0002] In the foundation pit in soft soil, when the excavation depth is greater than 7m, it is necessary to use internal support to resist the earth pressure acting on the vertical support body, which is a passive support function. The internal support system consists of column piles, columns and horizontal support beams, which increases the project cost and reduces the excavation efficiency in the foundation pit. In addition, with the construction of the underground structure, the internal support also needs to be removed layer by layer, which affects the environment and interferes with the construction of the underground structure. Contents of the invention [0003] The technical problem to be solved by the present invention is to...
Claims
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IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 马海龙马宇飞
Owner ZHEJIANG SCI-TECH UNIV