Desert area deep foundation pit excavation construction method

A construction method and deep foundation pit technology, which is applied in excavation, foundation structure engineering, construction, etc., can solve the problems of inconvenient excavation of deep foundation pits, and achieve the goal of eliminating construction safety hazards, lowering the foundation surface, and reducing the collapse of foundation pits Effect

Inactive Publication Date: 2019-10-22
SEPCO ELECTRIC POWER CONSTR CORP
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Problems solved by technology

Therefore, the special environment in desert areas brings inconvenience to the excavation of deep foundation pits in desert areas.

Method used

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  • Desert area deep foundation pit excavation construction method

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and embodiment the present invention is described further as follows:

[0018] The construction method of deep foundation pit excavation in desert areas, step 1, divide the pit to stake out the pit mouth; step 2, excavate the floating sand, and transport the floating sand to a safe area outside the foundation pit, so that the entire base surface is lowered to the height of the central pile mark; Step 3: Excavation by lowering the base surface, lowering the base surface to a depth of 3 meters; Step 4: Excavating the foundation pit in layers to meet the design requirements; Step 5: Protection of the foundation pit.

[0019] In this construction method, the tower is usually located in a sand pit, and the surrounding sand dunes surround the slope on all sides. By excavating the floating sand, the entire base surface is lowered to the height of the central pile level, which eliminates the construction safety hazards caused by the...

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Abstract

The invention discloses a desert area deep foundation pit excavation construction method, belongs to the field of foundation pit construction, and aims to reduce the foundation pit collapse condition,accelerate the forming speed and guarantee the construction quality and safety. The desert area deep foundation pit excavation construction method comprises the following steps: (1) the lofting is performed on pit ports of all pits; (2) floating sand is excavated and conveyed to a safety zone beyond a foundation pit, so that the whole base surface is reduced to the center pile elevation; (3) a lower base surface is excavated, so that the base surface is lowered to the foundation pit excavation depth of 3 m; (4) the foundation pit is excavated layer by layer to meet the design requirements; and (5) the foundation pit is protected. In the construction method, through excavation of the floating sand, the whole base surface is lowered to the center pile elevation, so that potential safety hazards in construction caused by the floating sand are eliminated; and the base surface is lowered to facilitate smooth implementation of subsequent excavation of the foundation pit. Through excavationof the lower base surface, the foundation pit excavation depth is reduced, so that the foundation pit collapse condition is reduced, the construction safety and the foundation pit stability are guaranteed, the foundation pit collapse risk is reduced, and meanwhile, the quick formation of the foundation pit is facilitated.

Description

technical field [0001] The invention belongs to the field of foundation pit construction, in particular to a construction method for excavating deep foundation pits in desert areas. Background technique [0002] The foundation of the 750kV ultra-high voltage transmission line project is relatively deep, and the excavation of the foundation pit is relatively deep. The average depth of the foundation pit is between 4.5m and 5.5m. In the desert area, due to the large undulations of the terrain, most tower bases are located in sand pits in the desert. There are sand dunes around the tower base, with varying heights and a large amount of floating sand. The soil in the desert area is silty sand with strong fluidity. When the foundation pit is excavated, it collapses while digging, and the foundation pit is not easy to form. And because the vegetation in the desert area is fragile, protective measures need to be taken during construction to strictly control the piling of spoils to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/04
CPCE02D17/02E02D17/04
Inventor 王东亮马彬周海斌万思良
Owner SEPCO ELECTRIC POWER CONSTR CORP
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