Cheng County is located in the Longnan mountainous area in southern Gansu Province. To further improve urban traffic, the county is building a new bridge across the Dong River on the north side of the county seat - Jinhe Bridge. The bridge is about 200 meters long, with a through tied-arch structure. The east side of the bridge connects to Wangmo Road, and the west side connects to Chengbei Road. It is a two-way four-lane highway bridge with a width of 30.5 meters, with sidewalks and non-motorized lanes on both sides. Once completed, Jinhe Bridge will become a landmark building in the Longnan area. Steel Sheet Pile Cofferdam Method
Henan Yuanjian Engineering Technology Co., Ltd. undertook the foundation pit support work for the bridge piers. The two mid-span piers of the project are located in the main channel of the Dong River. The foundation pit dimensions are: 30 meters long, 10 meters wide, and 8.5 meters deep. According to the overall plan requirements, combined with actual site conditions and comprehensive consideration of efficiency and economy, the project department chose the steel sheet pile cofferdam method for construction.

To ensure the stability and safety of the foundation pit support structure, the steel sheet piles used for the cofferdam are designed to be 12 meters long. The soil layer at the bridge site is mainly round gravel (cobble), with a thickness of more than ten meters. The maximum cobble particle size is up to 20 centimeters, and there are even boulders with larger particle sizes in many places. According to past construction experience, under such geological conditions, steel sheet pile driving must first be guided by pre-drilling. At the same time, because domestic construction mostly uses electric hammers, the construction efficiency is low, and construction may even be impossible to complete. Most units can only consider abandoning the steel sheet pile cofferdam scheme and switching to more conservative steel boxed cofferdams or caissons, which undoubtedly increases project costs.

416L Hydraulic Vibratory Hammer
Manager Xu of Yuanjian Company has used electric hammers for many years and has rich experience in electric hammer construction. He said that although the exciting force of domestic 120-type and 150-type electric hammers is comparable to that of the 416L hydraulic vibratory hammer, for the special geological conditions of Jinhe Bridge, traditional construction techniques cannot complete the construction on schedule, and there is even a possibility of construction failure. Therefore, based on geological parameters, they decisively selected the ICE 416L hydraulic vibratory hammer, which is the smallest free-hanging hydraulic vibratory hammer available for rent from ICE. As expected, the 416L easily completed the steel sheet pile cofferdam driving task within one month.
Gansu
The foundation pit dimensions are 30 meters long, 10 meters wide, and 8.5 meters deep
416L 416L hydraulic vibratory hammer with 400 power pack

Manager Xu said that compared with hydraulic vibratory hammers, electric hammers have many weaknesses: heavy weight, higher requirements for lifting equipment; need power supply, inconvenient to move, and unsafe for construction in rainy days; the lower end of the clamp is flush, which is time-consuming for pile alignment; low frequency, resulting in insufficient power; high-strength bolts connecting the clamp and the hammer are easy to loosen during driving, and the bolts must be checked and tightened after each driving, affecting construction speed; the operating system is a control cabinet, which is inconvenient to move, and the operator cannot closely monitor the hammer's operating status in time. ICE's hydraulic vibratory hammer completely avoids these problems: the clamp design is more scientific, the bolts are stronger, wireless remote control, power provided by the power pack, easy to use, low maintenance, and fast construction speed.

Don't want to switch back!
Manager Xu expressed his great gratitude to ICE for providing the hydraulic vibratory hammer, which completely overturned traditional construction concepts, opened up a new construction technology for them, and helped them expand the market. After a while, they will continue to rent ICE hydraulic vibratory hammers for subsequent foundation construction projects, because once the electric hammer is replaced by a hydraulic hammer, they never want to switch back!