Device for self-expanding of expanded base

Abstract

The invention discloses a device for self-expanding of an expanded base, The device comprises an outer wall of a self-expansion box body and an I-shaped structure, wherein an self-expansion material is filled in the self-expansion box body, the self-expansion box body and the I-shaped structure limit the upward and downward expansion force of the expansion material, so that the self-expansion material can only horizontally expand. According to the device, the self-expansion material can be poured into the device, the expansion performance of the self-expansion material is utilized to form an expansion head, the formation of the expansion head is free of pollutant of noise, dust and the like, and is economical and practical, operation is convenient and application range is wide, the designrequirement of a pile foundation with relatively high requirement on the bearing capacity and the pulling resistance can be well met.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, relates to the field of construction engineering, in particular to a self-expanding device for bottom expansion. Background technique [0002] With the continuous development of engineering construction, large buildings have higher and higher requirements on the bearing capacity of foundations. In order to increase the bearing capacity of single piles, it is an economical and effective method to use expanded bottom pile foundations in foundation construction. Bottom-expanding piles are improved and perfected on the basis of equal-section piles. During construction, after excavating to the design bearing layer, the bottom of the pile body is expanded, and concrete is poured to form piles after reaching the diameter of the expanded bottom required by the design. Thus forming the concrete enlargement head at the bottom. At present, the commonly used expanded bottom pile foundations in my ...

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Problems solved by technology

[0003] The expanded bottom pile foundation can achieve "small diameter, large load capacity", but there are still many problems in the traditional expanded bottom pile foundation, such as the formation of the enlarged head often requires large-scale mechanical assistance; the hole wall stability is poor after the enlarged head is formed, and the hole is easy to collapse The compactness and impermeability of the pile body concrete are poor, and harmful substances are easy to directly corrode the concrete; during the construction process, it is easy to cause pile body defects such as broken piles, hole wall collapse, pile body inclusions, and honeycomb pockmarks; A lot of noise and dust pollution; low pile efficiency and high cost

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