A kind of soft soil foundation pit excavation method
A foundation pit and soft soil technology, applied in excavation, foundation structure engineering, construction, etc., can solve problems such as large amount of subsidence, low soft soil strength, and steel support pressure changes that cannot be measured in time
Active Publication Date: 2021-05-04
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +1
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Problems solved by technology
Due to the low strength of soft soil and large amount of sinking, it often brings great harm to road engineering. If it is not handled properly, it will have a great impact on the construction and use of roads.
[0003] In order to prevent the deformation of the section from increasing during the excavation of the foundation pit, a steel support servo system was added to the axis of the section with large deformation. Due to thermal expansion and cold contraction, the pressure change of the steel support cannot be measured in time, resulting in untimely control and unstable pressure, resulting in a decline in the support effect of the steel support. Accordingly, the present invention proposes a soft soil foundation pit excavation method
Method used
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[0039]As a specific embodiment of the present invention, the support method of the steel support servo system is as follows:
[0040]A1: Sub-stretching when the steel support is set, the first time to pre-add to 60% of the design value, 100% of the design value, 3 to 4 hours, 3 to 4 hours, at any time, forming a curve, each 2 ~ 3 The sky is added to grasp the law; the design value is added to the design value to prevent damage to steel support, thereby ensuring the normal operation of steel support;
[0041]A2: A1 The support shaft force is applied to ensure uniformity, regularity, and ensure that the solar body stress relies, avoiding the loose situation after steel support;
[0042]A3: The region of each bottom plate is supported according to the length of the steel, each of which is supported by 2 steel support, and the steel support pre-axis force value is 30% of the design value;
[0043]A4: Adjusting the φ609 steel support of the bottom of the A3 to φ800 steel support and the underlying s...
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The invention belongs to the technical field of foundation pit excavation, and specifically relates to a method for excavating foundation pits in soft soil. The steel support servo system used in the method includes a mounting plate, and a partition plate is fixed on the top of the mounting plate. A hydraulic station is fixed on the top of the installation plate, and a hydraulic cylinder is fixed on the side wall of the partition plate. The hydraulic station communicates with the hydraulic cylinder through an oil pipe. A temperature sensor is provided, a baffle is fixed on the top of the mounting plate, a protective plate is fixed on the top of the baffle and the partition plate, and a mounting flange is fixed on the side of the baffle away from the hydraulic station; the present invention uses the temperature sensor And the setting of the push rod motor to monitor and adjust the steel support servo system in time, so that the gap and pressure between the steel support servo system and the section of the foundation pit remain stable, thereby improving the effect of the steel support and ensuring the stability of the foundation pit. Excavated smoothly.
Description
Technical field[0001]The present invention belongs to the field of foundation pit excavation, and specifically, it is a soft solenoid excavation method.Background technique[0002]Foundation pit refers to the following spaces that are covered with buildings (including structures) and the construction of the basement. The soft soil refers to the natural water content of the coastal, lake, valley, and river beach, the pore ratio, high compression, and low shear strength. High water content, high natural pore ratio, high compression, low shear strength, small consolidation coefficient, high sensitivity, high disturbance, poor disturbance, and earth layer layer distribution complex, all floors The physical mechanical properties are different. my country's highway industry norms definitions of soft land foundation refers to a weak strength of low strength and high compression, and most of them contain certain organic substances. Due to the low strength of the soft soil, the amount of depos...
Claims
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IPC IPC(8): E02D17/02E02D17/04
CPCE02D17/02E02D17/04
Inventor 郭兵梁凌田德新钟华王赫杰崔保鹏刘得俊孔江平李琪
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR