Hydraulic hammer piling method is a method of pile foundation construction using hydraulic pile hammer. As a kind of impact pile hammer, hydraulic pile hammer can be divided into single-acting and double-acting types

according to its structure and working principle. The following is a detailed explanation of hydraulic hammer piling method:

一、Working principle of hydraulic pile hammer

1.Single-acting hydraulic pile hammer:

●?Principle: The impact hammer core is lifted to a predetermined height by a hydraulic device and then quickly released, and the impact hammer core hits the pile body in a free fall manner.

●?Features: Corresponding to the theory of heavy hammer and light hitting, the hammer core has a large weight, low impact speed, long hammering time, and a large penetration degree per impact. It is suitable for piles of

various shapes and materials, with a low pile damage rate, and is especially suitable for driving concrete pipe piles.

2.Double-acting hydraulic pile hammer:

●?Principle: After the impact hammer core is lifted to a predetermined height by a hydraulic device, it obtains acceleration energy from the hydraulic system to increase the impact speed and hit the pile body.

●?Features: Corresponding to the theory of light hammer and heavy hitting, the hammer core has a small weight, high impact speed, short hammering time, and large impact energy, which is most suitable for driving steel piles.

二、 Construction process of hydraulic hammer piling method

1.Preparation stage:

●??Select the appropriate hydraulic piling hammer model and specifications, and debug and inspect the equipment according to the construction requirements.

●?Prepare the pile body, including prefabricated concrete structure piles, steel sheet piles, H-shaped steel, etc., to ensure that the quality of the pile body meets the design requirements.

2. Installation stage:

●?Install the hydraulic piling hammer on the pile frame to ensure that the equipment is stable and reliable.

●?Adjust the height and angle of the pile frame according to the construction requirements so that the hydraulic piling hammer can accurately align with the pile body.

3. Piling stage:

●?Start the hydraulic piling hammer and lift the impact hammer core to a predetermined height through the hydraulic device.

●?Release the impact hammer core so that it strikes the pile body in a free fall or accelerated fall.

●?Repeat the above process until the pile body reaches the depth and position required by the design.

三、Advantages of hydraulic hammer piling method

1. High efficiency: The hydraulic piling hammer has a higher impact energy and striking frequency, which can significantly improve the piling efficiency.

2. Environmental protection: Compared with the traditional diesel piling hammer, the hydraulic piling hammer has low noise, low vibration, no oil fume pollution, and is more in line with environmental protection

requirements.

3. Adaptability: Hydraulic pile hammers are suitable for piles of various shapes and materials, including concrete pipe piles, steel sheet piles, H-shaped steel, etc.

4. Accuracy: By accurately controlling the parameters of the hydraulic system, accurate control of the pile driving depth and position can be achieved.

In summary, the hydraulic hammer pile driving method is an efficient, environmentally friendly, adaptable and accurate pile foundation construction method, which has been widely used in modern engineering construction.