A self-expanding device for bottom expansion

Abstract

The invention discloses a self-expanding device for expanding the bottom, which comprises an outer wall of a self-expanding box and an I-shaped structure; The upward and downward expansion force of the expansion material is suppressed, so that it can only expand horizontally. The invention can pour expansion material into the device, utilize the expansion performance of the expansion material to form an expansion head, the formation of the expansion head has no pollution such as noise and dust, is economical, easy to operate, has a wide application range, and can well meet the requirements for bearing capacity and pullout resistance. Design requirements for pile foundations with higher force requirements.

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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