A kind of steel pipe support pile and anchor pole deep foundation pit support structure and its construction method

Abstract

The invention discloses a construction method of a support structure for a steel tube underpinned pile and an anchor rod deep foundation pit. The construction method comprises the following steps: (1) paying off and locating the steel tube underpinned pile; (2) excavating a guide pit; (3) excavating an operation pit; (4) installing the steel tube underpinned pile; (5) detaching pile pressing equipment, filling concretes into the whole cavity of the steel tube underpinned pile, and vibrating and compacting the concretes; (6) performing pre-underpinning treatment on the steel tube concrete underpinned pile; (7) implanting anchor bars into the part, which is contacted with an existing building foundation, of the steel tube concrete underpinned pile, and connecting the anchor bars with the steel tube concrete underpinned pile; (8) back-filling the operation pit in layers and tamping; (9) excavating soil in the foundation pit; (10) injecting cement paste or cement mortar into a drilled hole of the anchor rod; (11) installing a waist beam of the anchor rod. The support structure for the steel tube underpinned pile and the anchor rod deep foundation pit has the advantages of small field required for construction, definite structure stress, short construction period, simplicity and convenience for construction, less influence on the environment, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of building structure construction, and in particular relates to a steel pipe underpinning pile and anchor rod deep foundation pit support structure and a construction method thereof. Background technique [0002] With the rapid development of my country's economic construction, a large number of urban high-rise buildings have emerged, and the foundation depth has become larger and larger, accompanied by the emergence of many deep foundation pits. Due to dense urban buildings and complex environmental conditions around foundation pits, in many cases, there are existing buildings around foundation pits, so it is particularly important to ensure the safety of deep foundation pits and adjacent existing buildings. Conventional support methods usually have the following problems: (1) In some narrow areas of the construction site, the slope of the foundation pit is often restricted, and vertical excavation has to ...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a construction method for steel pipe underpinning piles and anchor rod deep foundation pit support structure. (2) The problem of slippage between the steel pipe underpinning pile and the foundation; (3) The problem of the steel pipe pile being prone to instability after being stressed; (4) The steel pipe pile Weak lateral resistance of underpinning piles

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