Self-sinking type deep foundation pit barrier wall structure and construction method for underground space structure

Abstract

The invention provides a self-sinking type deep foundation pit barrier wall structure. The self-sinking type deep foundation pit barrier wall structure comprises a barrel type barrier wall body, wherein the bottom of the barrel type barrier wall body is provided with a ground breaking structure, and the ground breaking structure and the barrel type barrier wall body are in gravity matching to achieve downward ground breaking. The self-sinking type deep foundation pit barrier wall structure further comprises resistance enhancement devices, wherein the resistance enhancement devices are arrangedon the outer side wall of the barrel type barrier wall body and used for cooperating with a foundation to adjust the upward resistance applied by the foundation to the barrel type barrier wall body.The bottom of the barrel type barrier wall body is provided with the ground breaking structure, hammering operation is avoided, self-sinking can be achieved, and construction procedures are decreased;generated construction noise is low, the construction duration is short, and pollution to the surrounding environment is small; and the resistance enhancement devices are arranged to adjust the upward resistance applied by the foundation to the barrel type barrier wall body, and thus, the sinking speed and / or perpendicularity of the self-sinking type deep foundation pit barrier wall structure canbe controlled according to different soil body conditions. The invention further provides a construction method for an underground space.

Description

technical field [0001] The invention relates to a self-sinking deep foundation pit retaining wall structure and a construction method for an underground space structure. Background technique [0002] The construction of underground buildings is too difficult and expensive, especially when it involves soft soil foundation, the proportion of "foundation pit support" is too large, and the "support cost" is often higher than the cost of the main building. In addition, the construction of underground engineering is complex, resulting in many process links, difficult connection, long construction period, and excessive impact on the surrounding environment, such as noise, vibration, exhaust gas, mud, etc., especially in densely populated areas. In the prior art, when supporting deep foundation pits, the form of pile driving is mainly used to form a retaining wall. For example, Chinese patent document CN108708382A discloses a continuous retaining wall for deep foundation pits, where...

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Problems solved by technology

[0003] Although the above two retaining walls can drive the piles to the design depth according to the construction requirements, the piling construction itself will lead to more construction procedures, greater construction noise, longer construction period, and greater pollution to the surrounding environment, etc. shortcoming

[0004] If a deep foundation pit retaining wall structure can be designed to sink from the soil by its own gravity and avoid the hammering process, the above technical problems can be better solved; however, due to the inconsistency of the soil conditions at the construction site , For example, the water content of the soil at different depths is different, resulting in different frictional resistance encountered by the deep foundation pit retaining wall structure sinking to different depths, thus affecting the sinking speed, such as sinking too fast at a certain depth ; In addition, because the frictional resistance produced by the soil at different positions at the same horizontal depth will also be different, which will affect the verticality of the deep foundation pit retaining wall structure when it sinks, and then affect the quality of the project

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