Soil-squeezing hole expanding pile and construction method and drilling tool thereof

Abstract

The invention provides a soil-squeezing hole expanding pile and a construction method and drilling tool thereof. The soil-squeezing hole expanding pile comprises a soil-squeezing part and a hole expanding part located at the bottom of the soil-squeezing part. The soil-squeezing part comprises a pile foundation and a concrete pile body arranged in the pile foundation in a filled mode. The pile foundation comprises a soil-squeezing layer located at the inner periphery of the pile foundation, and an inner thread formed in the inner wall of the soil-squeezing layer. The concrete pile body comprises an outer thread formed in the outer wall of the concrete pile body. The inner thread is in screw confection with the outer thread. A blocking ring structure of the soil-squeezing hole expanding pile conducts secondary squeezing on the hole wall of the squeezing-expanding-formed pile, soil is prevented from being screwed out in the pile forming process, and thus the pile is formed directly through squeezing and expanding. In addition, an expanding head is of a double-layer structure with an inner barrel and an outer barrel, and an expanding tooth is arranged on the inner barrel. Besides, through rotation of the expanding head, out stretching and retracting of the expanding tooth are controlled, and expanding of different soil textures is completed.

Description

【Technical field】 [0001] The invention relates to the field of construction engineering, in particular to a soil-squeezing reaming pile, a construction method of the soil-squeezing reaming pile and a drilling tool thereof. 【Background technique】 [0002] At present, in foundation projects such as construction, water conservancy, and highways, double-helix extruded piles are currently the most commonly used form of pile foundation. The soil that is drilled out of the hole will be squeezed into the side wall of the pile hole, and then the two-way helical closed extrusion drill bit will move upwards and rotate again to squeeze and expand the pile hole. Squeeze into the side wall of the pile hole, and start the concrete pump to press the pile material into the pile hole while the topspin is lifted. The main problem is that the soil is rotary excavated first, then transported upwards and then squeezed to the pile walls on both sides. Therefore, the rotated soil will block the tr...

AI Technical Summary

Problems solved by technology

The bearing capacity of cast-in-situ piles used in existing pile foundation construction is mainly composed of pile end soil resistance and pile side soil friction; Pile may not meet the requirements

Images