Out-pit large-span truss type supporting structure for foundation pit support

Abstract

The invention discloses an out-pit large-span truss type supporting structure for foundation pit support. The out-pit large-span truss type supporting structure comprises an upper chord member, a lower chord member, a vertical rod and a diagonal web member, wherein the upper chord member and the lower chord member are connected through the middle web member and the diagonal web member to form the out-pit truss type supporting structure; a truss is triangular or trapezoidal; the lower chord member can also be used as a top beam for supporting the top of a pile; and an in-pit supporting rod is arranged at the supporting end part of the truss for fixing, so that an out-pit large-span truss type supporting structure system is formed. The supporting system has the advantages of large span, high rigidity, convenience in construction, material saving and the like, the in-pit supporting distance can be greatly increased, the in-pit construction operation condition is improved, the foundation pit support safety is improved, the construction period is shortened, the construction cost is saved, and the like.

Description

technical field [0001] The invention belongs to the field of deep foundation pit engineering support, in particular to a large-span truss type support structure outside the pit for soft soil foundation pits. Background technique [0002] Deep foundation pit support often adopts different foundation pit support methods according to the surrounding environmental conditions outside the pit, site geological conditions, and excavation depth of the foundation pit, so as to meet the requirements of foundation pit safety and reasonable cost. [0003] For deep foundation pit projects in soft soil areas in urban dense areas, due to the tense surrounding environment and the nature of the soil, it is often necessary to adopt the support method of support piles + internal supports. The internal support system is mainly composed of crown beams or purlins, main braces, secondary braces and other rods, and is arranged in the form of braces, corner braces, side trusses or several combination...

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: The purpose of the present invention is to provide a large-span truss-type support structure outside the pit for foundation pit support. By setting the truss-type support structure outside the pit, the characteristics of good mechanical performance and strong spanning ability of the truss-type structure are fully utilized. , to increase the spacing of supports in the pit as much as possible, aiming to solve the shortcomings of the prior art, such as low rigidity, small span, dense support, high coverage rate, and unfavorable construction of the crown beam in the middle and deep foundation pit

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