Pile hammer is a kind of construction machinery that drives the pile into the stratum. It is composed of a pile hammer and a pile frame (some have a support without a pile frame). The pile hammer moves left and right along the pile frame (or swing rod) to impact the pile top and make the pile move down. The key is to drive the bridge foot pile when building a low water bridge or a bridge under the river surface, and also can use the basic pile and variable displacement pile for working.
The whole process of pile driving is divided into three parts：
①The heavy hammer fell at will. Firstly, hoist the heavy hammer to make it have sufficient gravitational potential energy. After the heavy hammer is released, it will fall freely, and all the potential energy of gravity will be changed into mechanical energy.
②Complete non ductile collision of the hammer with the pile. Because the impact force between the hammer and the pile is huge, the resistance of the pile to the road surface can be ignored. The total angular momentum of the hammer and the pile maintains the conservation law. According to the law of conservation of angular momentum,mv=(m+M)V，Where m and V are the mass of the hammer and its velocity before collision, M is the mass of the pile, and V is the mutual velocity of the hammer and the pile after collision.
③The hammer moves with the pile. The mass of each other is m + m and the initial velocity is v. the soil resistance encountered by them is much larger than that of gravity, which can be ignored. Using the remaining mechanical energy of the hammer and pile after collision, they can get rid of the resistance of the soil and work into the soil layer.
Pile driving boat refers to the engineering ship used for piling and pulling in hydraulic engineering construction. Generally, it is named after the length of pile driving, such as 36m pile driving boat, 54m pile driving boat, etc. The ship is of steel box structure and is not self-propelled. In the middle of the bow, a solid triangular truss type pile frame organization and pile driving hammer are set up. During the work, the pile is lifted, the ship is moved and the precise positioning is carried out according to the linkage organization of steel rope, moving pulley and lifting winch, and the pile is driven into the water by the explosive force of pile hammer. With the help of sinking hammer and pulling hammer, the pile in the burial can be pulled out. The pile hammer can be used as a crane ship. The piling barge can work in coastal areas, rivers and lakes with a certain water level. The anchor boat, tugboat and pile barge must be dropped to cooperate with each other.
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