Steel sheet pile and cast-in-place pile combined type foundation pit supporting structure and construction method

Abstract

The invention discloses a steel sheet pile and cast-in-place pile combined type foundation pit supporting structure and a construction method. The steel sheet pile and cast-in-place pile combined typefoundation pit supporting structure comprises a supporting structure body formed by combining a steel sheet pile and a cast-in-place pile, wherein the steel sheet pile is arranged at the shallow layer of a foundation pit; the cast-in-place pile is arranged at the deep layer of the foundation pile; the steel sheet pile adopts a buckled water stop steel sheet pile; and the two ends of the cross section of the steel sheet pile are correspondingly provided with a clamping bump structure and a clamping groove structure which is symmetric to the clamping bump structure. The supporting structure andthe construction method are suitable for geological conditions that the upper ground layer of a planned constructions scheme is a water-containing water layer such as filled earth, soft soil or floury soil and the lower part is a hard soil body or decayed rock. N is an integer which is not smaller than 2. The upper part of the supporting structure adopts the steel sheet pile to achieve dual effects of retaining soil and stopping water; the lower hard soil layer or rock is only provided with a soil retaining cast-in-place pile, and no water stop pile is arranged, so the manufacturing cost is lowered; the steel sheet pile can be pulled out in the later period, so the steel sheet pile and cast-in-place pile combined type foundation pit supporting structure is green and environmentally friendly and the manufacturing cost is lowered; after construction of the steel sheet pile and excavation can be started, no maintenance is needed; the cast-in-place pile at the deep layer is maintained inan excavation period of the shallow layer soil body; after the steel sheet pile is pulled out, no barriers are left, so convenience is provided for pipeline construction around buildings.

Description

technical field [0001] The invention relates to a foundation pit support structure and a construction method of a steel sheet pile combined pouring pile in civil engineering, belongs to the field of civil engineering, and is suitable for deep foundation pit support in construction engineering, embankment engineering, pipeline engineering and subway engineering. Background technique [0002] The foundation pit project not only faces excavation and retaining soil, but also faces seepage prevention and water resistance, but as a temporary structure, the foundation pit support piles have a short service life and high cost. Therefore, shortening the construction period of the foundation pit and reducing the cost of supporting piles have become problems that must be solved, especially in the shallow soil of the proposed foundation pit site is filled soil or loose silt, sandy soil, while the deep soil mass of the foundation pit site When excavating a foundation pit for hard soil or...

AI Technical Summary

Problems solved by technology

Although the steel sheet piles can be pulled out and the steel supports can be removed and reused, this construction method has the following disadvantages: (1) It does not solve the problem of not needing to install water-stop piles for foundation pit support in deep strata, and it is still not economical; (2) The cast-in-situ piles are still installed from the ground, and the cast-in-place piles still need to be removed when the pipeline is buried in the later stage; (3) For the case where the shallow layer of the foundation pit site is filled with soil and loose soil, and the deep layer of the site is hard soil or weathered rock, pull Mori steel sheet piles cannot be inserted into hard soil and weathered rocks, and cannot form an effective foundation pit support structure

However, there are still the following defects: (1) because the cast-in-situ piles and steel sheet piles are arranged at intervals in this invention, the maintenance problem of the cast-in-place piles has not been solved, and most of the construction period of the entire project is still occupied; (2) the steel sheet piles are arranged at intervals between the cast-in-place piles During the period, due to the on-site pouring of cast-in-place piles, when the diameter of the cast-in-place piles expands, the steel sheet piles will not be able to be constructed; (3) The cast-in-place piles and steel sheet piles are arranged at intervals. It is bound to cause the steel sheet piles to bend and other deformations, and get stuck between the cast-in-place piles, and the steel sheet piles will not be able to be pulled out later.

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