Screw pile lowering device applying force through ground, and pile lowering method

Abstract

The invention relates to a screw pile lowering device applying force through the ground, and a pile lowering method. The screw pile lowering device comprises a pile body and a force applying mechanism; the pile body comprises a steel outer tube and a concrete pile body, wherein the horizontal sections of the steel outer tube and the concrete pile body are each in a ring shape; the length of the steel outer tube is smaller than the length of the concrete pile body; the outer circumferential face of the steel outer tube is provided with a first external thread in the length direction of the steel outer tube, and the inner circumferential face of the steel outer tube is provided with an internal thread in the length direction of the steel outer tube; the outer circumferential face of the concrete pile body is provided with a second external thread matched with the internal thread; and a tubular clamp clamps the steel outer tube from the upper end of the steel outer tube to drive the steelouter tube to be rotationally screwed into the ground, and a gravity device downwards presses the steel outer tube. Hammering and static pressing are not needed, the pile lowering effect is good, ground holding is firm, the speed is high, damage to a pipe pile is small, and the linearity of the pipe pile is good.

Description

technical field [0001] The invention relates to a screw pile lowering device and a pile lowering method for applying force by using ground, and belongs to the field of building materials and construction. Background technique [0002] At the end of the 1960s, the Fengtai Bridge Factory of the Ministry of Railways began to produce pre-tensioned prestressed concrete pipe piles (referred to as PC piles), which were mainly used for the foundation construction of railway bridge projects; in the 1970s, post-tensioned prestressed concrete pipes were developed and produced. pile. Since the 1970s, especially in the construction of Shanghai Baoshan Iron and Steel Works, a large number of steel pipe piles imported from Japan have been used, which are not only expensive but also poor in durability. In order to meet the needs of port construction and development, in 1987, the Third Navigation Bureau of the Ministry of Communications introduced a full set of prestressed high-strength con...

AI Technical Summary

Problems solved by technology

Since the 1970s, especially in the construction of Shanghai Baoshan Iron and Steel Works, a large number of steel pipe piles imported from Japan have been used, which are not only expensive, but also poor in durability.

[0003] Existing pipe piles generally use pile driving or static pressure to install piles. The pile driving method will cause great damage to the pipe pile and high noise, so it is not suitable for construction in cities; the static pressure method takes a long time and the volume of the static press Big, easy to carry

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