Pit excavation method in large-area pit with internal support under condition of soft soil foundation
A soft soil foundation and pit-in-pit technology, which is applied in excavation, soil protection, infrastructure engineering, etc., can solve the problems of difficulty in controlling the deformation of the enclosure structure, high safety risks, and low excavation efficiency. Excavation efficiency and safety issues, large promotion and application space, and the effect of improving excavation efficiency
Active Publication Date: 2014-04-30
CHINA MCC20 GRP CORP
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Problems solved by technology
Due to the weak soil quality and the limitation of internal support, it is very difficult to excavate the pit in the pit, and the excavation of the pit in the pit is the key to the deformation of the entire foundation pit, which poses a great safety risk
In recent years, in coastal soft soil foundations, due to improper disposal of pit-in-pit excavation, the enclosure structure collapsed, "kicking and making dumplings" or excessive deformation inside and outside the foundation pit caused large-scale engineering piles to fall and break Phenomena occur from time to time, and even personal injury accidents occur due to the collapse of foundation pits, causing great losses to people's lives and property
[0004] Therefore, the technicians reached a consensus that in this case, it is necessary to use support first and then dig, and the deformation of the enclosure structure can be well controlled, but it is quite difficult to excavate with support or under support, and the excavation efficiency is low; dig first and then support Although the excavation efficiency of this method can be greatly improved, it is difficult to control the deformation of the enclosure structure. If the support installation cannot keep up with it in time, it may lead to disastrous consequences
Method used
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[0053] As shown in the figure: In the pickling-rolling mill production line project of a steel plate company, the deep foundation pit group in the rolling mill area adopts a stepped layered combination support method, in which the pit-in-pit in the underground oil depot area of the rolling mill is located in the center of the foundation pit group, and the pit-in-pit Steel sheet piles + steel pipe inner support are used for support, and the support range is -5.7m~-10m, and gravity retaining walls are used around the foundation pit from -5.7m to the natural ground. The pit in the pit is 90m long and 40m wide, with a large area and an excavation volume of 15,000 m3. The pit-in-pit supports are φ609×12 standard steel pipe supports with a spacing of 4.5m, and corner braces at the corners of the foundation pit are set at a spacing of 3m. The foundation pit area is flow plastic silt, moisture content w=30~90%, average 58.8%; void ratio e=1.625, compressibility a v1 -2=1.223MPa -1...
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The invention relates to a deep foundation pit excavation method under the condition of a soft soil foundation, in particular to a pit excavation method in a complicated deep foundation pit group large-area pit under the condition of the soft soil foundation. The pit excavation method in a large-area pit with an internal support under the condition of the soft soil foundation is characterized in that a supporting method comprises the following steps of: step 1, reinforcing soft soil in the foundation pit and improving the engineering performance of the soft soil; step 2, arranging a tower crane to conveniently and quickly install the support; step 3, symmetrically blocking and synchronously excavating; step 4, retreating into excavation in a fan shape and simultaneously excavating and supporting; and step 5, timely blocking and pouring a foundation bottom plate. The invention has the beneficial effects that the soil excavation efficiency is improved, the foundation pit deformation and the simultaneous supporting and excavation are effectively controlled, the soil excavation difficulty is reduced, the soil excavation efficiency is improved, the construction cost is reduced, and the safety of the foundation pit is ensured.
Description
technical field [0001] The invention relates to the excavation of deep foundation pits on soft soil foundations, in particular to a method for excavating pits in support pits in a large-area belt of complex deep foundation pit groups under the condition of soft soil foundations. Background technique [0002] The typical characteristics of pits in complex deep foundation pits under soft soil foundation conditions are: flow-plastic silt layer with high water content, the undisturbed soil is weak, has high compressibility and rheology, and the soil quality after reinforcement and improvement is still in the category of soft soil; The foundation pit group has a large area and complex elevation changes. The enclosure structure is arranged in layers, and the support is combined. The pit-in-pit with internal support has a large area and is similar to a rectangle in shape. It is located in the middle of the deep foundation pit group; the pit-in-pit is a single The inner support of s...
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IPC IPC(8): E02D17/02E02D3/10E02D5/46
Inventor何建肖义陈志辉王友涛
OwnerCHINA MCC20 GRP CORP