Tapered wedge type adjustable device for foundation pit engineering inner support and construction method

Abstract

Disclosed are a tapered wedge type adjustable device for a foundation pit engineering inner support and a construction method. The device clamps tapered legs through two clamping plates to bear and transmit steel support shaft force under the action of a plurality of rows of high-strength bolts, 30-degree included angles are formed among the contacting surfaces of the clamping plates and the tapered legs, vertical positioning is determined by adjusting the high-strength bolts, the bolts are tightened, so that the shaft force can be born, the clamping plates of the tapered wedge type adjustable device contract with the tapered legs in a smooth surface manner, the high-strength bolts penetrate bolt grooves of the tapered legs and are fixed on the clamping plates of two sides, steel support shaft pressure can be effectively born, the drawing force generated by outward deformation of a soil layer can be born, and the integrality of enclosing purlins and steel supports is improved. The device changes a traditional idea that the adjustable device is driven into a steel wedge, the contacting surfaces are enlarged, a tapered wedge is tighter in pressed by the aid of the opposite-pull action of the high-strength bolts, the integrality of a foundation pit support system is ensured, and the falling risk of the steel supports is reduced.

Description

technical field [0001] The invention relates to a cone-wedge type activating device for internal support of foundation pit engineering, which mainly improves the form and process of the traditional steel supporting activating device, and belongs to the technical field of infrastructure construction auxiliary workpieces. Background technique [0002] The steel support of the foundation pit is widely used in the construction of the open excavation method. In engineering, Φ609 steel pipe support with a wall thickness of 16mm is generally used. The active device on the top is adjusted. In both methods, after applying the pre-loaded axial force with the jack, the steel wedge is driven in, and the jack is removed after being stabilized. The disadvantages of these two types of active devices are: the steel wedge force transmission method is unreliable, and it is easy to cause stress concentration and eccentric force; the single row of steel wedge steel support is unstable in later...

AI Technical Summary

Problems solved by technology

The angle between the splint and the contact surface of the tapered leg is about 30°. The vertical positioning is determined by adjusting the high-strength bolts, and the axial force can be withstand by tightening the bolts, which solves the problems of poor integrity and unreliable force transmission of the current steel support system.

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