Underground structure system with foundation pit supporting function and construction method

Abstract

The invention discloses an underground structure system with a foundation pit supporting function and a construction method. According to the technical scheme, the underground structure system comprises at least two layers of main body units which are sequentially arranged from outside to inside, wherein each main body unit comprises a plurality of main body piles which are distributed at intervals, and the main body piles can bear vertical loads and horizontal loads; every two adjacent main body piles of each main body unit are connected through a first supporting beam to form a closed structure; the main body piles corresponding to the adjacent main body units are connected through a second supporting beam; and the main body units are connected through the first supporting beams and the second supporting beams to form a main body frame structure. According to the underground structure system, the design of a supporting structure and the design of a main body structure are combined into one in the design stage, the main body piles can serve as the supporting structure and also serve as a part of the main body structure, and materials of the main body structure are saved; and the construction area can be effectively utilized, and the construction period can be shortened.

Description

Technical field [0001] The present invention relates to the field of foundation pit, and more particularly to an underground structural system and construction method having a foundation pit support function. Background technique [0002] The underground structural system is generally composed of the main structure and support structure, wherein the support structure only plays a support in the construction stage. The main body underground structure is completed, the foundation pit support structure does not work, the soil pressure is changed to the main structure (basement) Exterior wall) borne. This caused the support structure of the underground structure system only temporarily undertake the soil load, which is very limited. [0003] The construction process of the underground structural system is: First, the construction of the support pile is taken, and the water curtain is taken on the side of the support pile; after which the soil is excavated, the substrate is treated, a...

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Problems solved by technology

[0005] (1) Before the main underground structure is completed, the support structure bears the horizontal load of the soil, and the support piles and walls only play a role in the construction stage of the underground structure. After the underground structure is completed, the main structure such as the basement outer wall plays a corresponding role , bear the earth pressure, resulting in the existing support structure function is too single;

[0006] At present, in order to avoid the waste of support piles in the ground, some projects connect the support piles with the main structure and make them a part of the main structure. The choice of reinforcement and material is to meet its temporary function of bearing horizontal loads, and cannot replace the main structure, and there is no plan and method for bearing vertical loads of the main body;

[0007] (2) In order to erect the formwork of the main structure, a certain working space must be reserved. Due to the existence of the support structure, a part of the land area must be reserved as a fertilizer tank, and the fertilizer tank must be backfilled after the construction is completed, that is, the support structure The space between the protective structure and the main structure is completely wasted, and the existence of the fertilizer tank also makes the construction process cumbersome and complicated, and the construction quality is not easy to guarantee;

[0008] (3) The soil in the foundation pit needs to be fully excavated. Each supporting pile is subjected to a unidirectional horizontal load from the outside to the inside. The horizontal bearing capacity of a single pile is required to be high, the material input is large, and the functioning time is short. Significant waste performance;

[0009] (4) The construction process is complicated. It is not only wasteful but also inefficient to construct the support structure now, then excavate the earthwork, pour the basement exterior wall, and then backfill the soil, etc.

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