Device for knobby pushing and expanding spiral immersed tube stake and its engineering method

Abstract

The invention relates to a multi-section expansion screw pipe-deposition post, which is formed by inner pipe, outer pipe, upper and lower bow compression arms, axial pin, cylinder, hydraulic motor, vibrator and a cement head. First, entering said device into ground via vibration and rotation; lifting the steel cage into pipe; filling concrete; connecting the cylinder on the upper end of pipe to be expanded; vibration lifting the pipe to a preset height to be expanded; calling back it to be lifted and expanded again; calling it back and filling concrete and lifting the pipe from the hole to from several pipe-deposition post with multi-expanded head and multi-branch. The invention can fully utilize the bearing ability of soil, and the multi-section expanded head has strong strength of post, big distance between posts and less posts. Since the outer pipe with bigger outer diameter and the screw blades can discharge the soil, it can solve the soil-compression effect to confirm the operation quality with improved working efficiency, reduced cost and non-noise.

Description

Technical field: [0001] The invention relates to an immersed tube extrusion device and its construction method in the field of engineering construction, in particular to a multi-section extrusion and expansion immersed pipe cast-in-place pile in construction and its construction method, which are used for foundation treatment of construction engineering. Background technique: [0002] In recent years, the technology of sinking piles has been widely used, regardless of vibration sinking or static pressure sinking, can obtain fast, simple and low-cost effects, and is very popular among developers. However, in recent years, there are many problems in the actual implementation of construction. , especially on the soil squeezing effect, there are many problems. For example, when other piles cannot meet the bearing capacity, the number of piles must be increased, the distance between piles must be reduced, the internal stress cannot be released, and the soil squeezing effect is gre...

AI Technical Summary

Problems solved by technology

[0002] In recent years, the technology of sinking piles has been widely used, regardless of vibration sinking or static pressure sinking, can obtain fast, simple and low-cost effects, and is very popular among developers. However, in recent years, there are many problems in the actual implementation of construction. , especially on the soil squeezing effect, there are many problems. For example, when other piles cannot meet the bearing capacity, the number of piles must be increased, the distance between piles must be reduced, the internal stress cannot be released, and the soil squeezing effect is greater. In the process of pile-forming and pulling pipes, problems such as broken piles and diameter reduction often occur

In order to improve the bearing capacity, rammed and expanded sinking piles appeared again. Although the bearing capacity was increased, the vibration and noise were also increased.

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