Offshore steel pipe pile construction process and precautions:
Preliminary preparation:
Offshore steel pipe pile construction requires sufficient preliminary preparation. First, conduct investigations and research, select a suitable construction site, conduct environmental risk assessments, and determine operating procedures and safety measures. Secondly, prepare the necessary equipment and tools, such as cranes, pile drivers, hanging baskets, ships, etc. Materials must also be prepared, such as steel pipe piles, wire ropes, sandbags, paint, etc.
The construction process of offshore steel pipe piles mainly includes the following steps:
1. Production of steel pipe piles and steel casings: The steel pipes used for steel pipe piles and the steel casings used for the underwater part of the borehole are all rolled on site. Use 10~14mm thick steel plates, roll them into small sections, and weld the small sections into large sections. Each section of the steel pipe is welded with inner and outer circumferences, and the weld width is not less than 2cm.
2. Assembling the pontoon: The pontoon is the foundation of the floating crane and consists of several small steel boxes. The small steel box is in the shape of a rectangular block with rounded corners around the bottom and a rectangular top. The small steel boxes are connected to each other by bolts and bayonet pins, and anchor holes are reserved on the top to connect and fix the anchor windlass or other equipment that needs to be fixed.
3. Floating crane assembly: The floating crane is a lifting equipment for water operations, which consists of a pontoon and a CWQ20 type detachable mast crane. The main body of the floating crane is a tripod, and the crane structure consists of an arm, a column, a diagonal brace, a turntable base and a cab.
4. Setting up an underwater platform: First, use a floating crane to anchor the anchor 60~100m away from the designed pile position, and use a buoy as a mark. Then, use the four winches (commonly known as anchor machines) on the guide ship, under the command of measurement, and use the telescopic anchor machines to position the guide ship, and accurately release each steel pipe pile on the guide ship according to its layout position.
5. Steel trestle design: The steel trestle is parallel to the center line of the main bridge. The design of the center line of the steel trestle takes into account the navigation needs during the construction process to ensure the smooth flow of the waterway during construction.
6. Construction process: It includes assembling pontoons, I-beams, trusses, winches, rotating bases and crane booms to form a floating crane, using the floating crane to use the guide ship composed of pontoons and I-beams as a guide frame, using the floating crane to drive steel pipe piles with the help of the guide ship, and setting up an underwater platform. With the underwater working platform as the support, steel casings are set up, holes are drilled, steel cages are lowered, and concrete is poured.
Basic components of pile-driving ships:
The basic components of pile-driving ships generally include the following parts: hull, crane, steel pipe piles, pile drivers, etc. Among them, steel pipe piles are an important part of pile-driving ships. They are hoisted into the sea by cranes and then driven into the seabed by pile drivers.
Working principle of steel pipe pile driving:
The working principle of steel pipe pile driving is to drive steel pipe piles into the seabed through the impact of pile drivers and fix them on the seabed. The specific working principle is as follows:
1. Lifting steel pipe piles: First, the crane lifts the steel pipe piles into the sea and positions them at the location where construction is required.
2. Positioning pile driver: Then, the pile-driving ship positions the pile driver at the top of the steel pipe pile through the equipment on board, so that it can exert impact force on the steel pipe pile.
3. Driving steel pipe piles: When the pile driver starts working, it continuously impacts the top of the steel pipe piles and gradually drives the steel pipe piles into the seabed.
4. Concrete pouring: When the steel pipe pile has been driven to the required depth, concrete can be injected into the steel pipe through the corresponding equipment to fill it and firmly connect the steel pipe to the seabed.
Advantages and applications:
Pile-driving ships have the advantages of fast construction speed, reliable quality and long service life, and are widely used in the field of offshore engineering. For example, offshore bridges, docks, offshore platforms, etc., all require pile foundation construction by pile-driving ships to ensure the stability and safety of the project.
Through the above steps, the piling construction of steel pipe piles can be carried out safely and effectively at sea to ensure the stable foundation of cross-sea bridges or other water buildings.
Read more: Steel Sheet Piles
Preliminary preparation:
Offshore steel pipe pile construction requires sufficient preliminary preparation. First, conduct investigations and research, select a suitable construction site, conduct environmental risk assessments, and determine operating procedures and safety measures. Secondly, prepare the necessary equipment and tools, such as cranes, pile drivers, hanging baskets, ships, etc. Materials must also be prepared, such as steel pipe piles, wire ropes, sandbags, paint, etc.
The construction process of offshore steel pipe piles mainly includes the following steps:
1. Production of steel pipe piles and steel casings: The steel pipes used for steel pipe piles and the steel casings used for the underwater part of the borehole are all rolled on site. Use 10~14mm thick steel plates, roll them into small sections, and weld the small sections into large sections. Each section of the steel pipe is welded with inner and outer circumferences, and the weld width is not less than 2cm.
2. Assembling the pontoon: The pontoon is the foundation of the floating crane and consists of several small steel boxes. The small steel box is in the shape of a rectangular block with rounded corners around the bottom and a rectangular top. The small steel boxes are connected to each other by bolts and bayonet pins, and anchor holes are reserved on the top to connect and fix the anchor windlass or other equipment that needs to be fixed.
3. Floating crane assembly: The floating crane is a lifting equipment for water operations, which consists of a pontoon and a CWQ20 type detachable mast crane. The main body of the floating crane is a tripod, and the crane structure consists of an arm, a column, a diagonal brace, a turntable base and a cab.
4. Setting up an underwater platform: First, use a floating crane to anchor the anchor 60~100m away from the designed pile position, and use a buoy as a mark. Then, use the four winches (commonly known as anchor machines) on the guide ship, under the command of measurement, and use the telescopic anchor machines to position the guide ship, and accurately release each steel pipe pile on the guide ship according to its layout position.
5. Steel trestle design: The steel trestle is parallel to the center line of the main bridge. The design of the center line of the steel trestle takes into account the navigation needs during the construction process to ensure the smooth flow of the waterway during construction.
6. Construction process: It includes assembling pontoons, I-beams, trusses, winches, rotating bases and crane booms to form a floating crane, using the floating crane to use the guide ship composed of pontoons and I-beams as a guide frame, using the floating crane to drive steel pipe piles with the help of the guide ship, and setting up an underwater platform. With the underwater working platform as the support, steel casings are set up, holes are drilled, steel cages are lowered, and concrete is poured.
Basic components of pile-driving ships:
The basic components of pile-driving ships generally include the following parts: hull, crane, steel pipe piles, pile drivers, etc. Among them, steel pipe piles are an important part of pile-driving ships. They are hoisted into the sea by cranes and then driven into the seabed by pile drivers.
Working principle of steel pipe pile driving:
The working principle of steel pipe pile driving is to drive steel pipe piles into the seabed through the impact of pile drivers and fix them on the seabed. The specific working principle is as follows:
1. Lifting steel pipe piles: First, the crane lifts the steel pipe piles into the sea and positions them at the location where construction is required.
2. Positioning pile driver: Then, the pile-driving ship positions the pile driver at the top of the steel pipe pile through the equipment on board, so that it can exert impact force on the steel pipe pile.
3. Driving steel pipe piles: When the pile driver starts working, it continuously impacts the top of the steel pipe piles and gradually drives the steel pipe piles into the seabed.
4. Concrete pouring: When the steel pipe pile has been driven to the required depth, concrete can be injected into the steel pipe through the corresponding equipment to fill it and firmly connect the steel pipe to the seabed.
Advantages and applications:
Pile-driving ships have the advantages of fast construction speed, reliable quality and long service life, and are widely used in the field of offshore engineering. For example, offshore bridges, docks, offshore platforms, etc., all require pile foundation construction by pile-driving ships to ensure the stability and safety of the project.
Through the above steps, the piling construction of steel pipe piles can be carried out safely and effectively at sea to ensure the stable foundation of cross-sea bridges or other water buildings.
Read more: Steel Sheet Piles
