The construction of construction method piles has been a relatively mature process method, which uses single or multi axis drilling and mixing, and repeatedly mixes with the soil by spraying cement with a drill bit. Before the cement soil mixture is set, steel plates or H-shaped steel are inserted to supplement its stress until the cement is solidified, and finally a seamless rigid underground wall with a certain strength is formed. This construction method is widely used in soft soil foundation, cohesive soil, silt, sand and gravel soil, which need to be excavated vertically.

In the process of pile construction with construction method, due to different geological conditions, the size and length of H-shaped steel are different. This article shares the case of Yongan YZ-180B penetrating the sand layer in Fujian Luanpin Piling project and driving 21 meters in long H-shaped steel!

The project of port construction is to build a rainwater pump station, which adopts an economic and effective solution, namely SMW method. During the construction of jet grouting pile, 300 * 700mm H-shaped steel with a length of 21m shall be driven! In consideration of cost, the construction party leased the electric hammer for construction. At the beginning, 10 meters is relatively easy, but even if the pile is driven for more than 10 meters for half an hour, it is difficult to drive until the hammer is overheated and damaged! Not only equipment loss, but also construction progress is difficult to guarantee. Moreover, there is only a 50t crane on site, so the weight of the hammer must be strictly limited. Light hammer body and large exciting force are the only criteria for hammer selection in this project!

Luanpin Port geological analysis

As early as 2017, Yongan Construction Machinery had a successful case of construction of No. 6 steel sheet pile near the port with resonance free hammer YZ-230F high frequency resonance hydraulic vibro hammer. For low-frequency vibratory hammers at port sites, it is easy to construct within 10 meters of silt layer, but sand layer will be encountered within 10-13 meters, and it is difficult to penetrate steel sheet piles or H-shaped steel!