Concrete-filled hollow steel tube supporting structure suitable for subway deep foundation pit

Abstract

The invention discloses a concrete-filled hollow steel tube supporting structure suitable for a subway deep foundation pit. The supporting structure comprises a first steel tube (1), a second steel tube (3) and a concrete layer (2), wherein the first steel tube (1) with the diameter being 600-1200 mm is arranged on the outermost layer and used for directly bearing an external load; the second steel tube (3) with the diameter being determined according to the thicknesses of the first steel tube (1) and the concrete layer (2) is arranged inside the first steel tube (1) and used for tightly pressing the concrete layer (2); and the concrete layer (2) with the thickness being 50-200 mm is arranged between the first steel tube (1) and the second steel tube (3) and used for enabling the first steel tube (1) and the second steel tube (3) to be connected, so that the integral concrete-filled steel tube supporting structure is formed. The concrete-filled steel tube supporting structure has the bearing capacity which is equal to or higher than that of a steel tube support under the condition that the size is reduced, and meanwhile, the self weight of the structure can also be lowered, and transportation and mounting of the supporting structure are facilitated.

Description

technical field [0001] Embodiments of the present invention belong to the technical field of rail transit engineering, and more specifically relate to a hollow concrete-filled steel tube support structure suitable for deep foundation pits of subways. Background technique [0002] In the construction of subway deep foundation pits, narrow and long foundation pits are mainly used. At present, the main support system used for subway foundation pits is generally reinforced concrete or steel pipe support, especially the steel pipe support is widely used, and its advantage is that the steel support can be reused, but the instability of the steel structure is an important factor restricting the bearing capacity . [0003] In order to solve the problems of insufficient bearing capacity and easy instability of the steel pipe support, some patents propose the use of steel pipe concrete support, which can effectively solve the instability problem of the steel support, but the weight o...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a hollow concrete-filled steel tube support structure suitable for deep foundation pits of subways, which can avoid the problems existing in conventional steel supports and concrete-filled steel tube supports, and can fully exert the compression resistance of the support. Bearing capacity, and can avoid problems such as large supporting weight of steel pipe concrete, inconvenient transportation and installation

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