Factors Affecting the Quality of LNG Storage Tank Pile Foundation Construction

Liquefied natural gas (LNG) storage tanks have high requirements on the bearing capacity of the foundation and foundation. At present, domestic and foreign LNG storage tank foundations often use direct foundations or pile foundations. The Tianjin LNG storage tank is built on an underwater fan-shaped land formed by silt-dominated sedimentation in the Bohai Bay. This natural foundation soil generally cannot meet the requirements of settlement and deformation caused by the superstructure load. The pile foundation is a deep foundation that connects the tops of several piles as a whole by a cap, and bears loads together, so it has greater integrity and stiffness, which can meet engineering requirements. The geology of Tianjin LNG station yard is different from other areas. The pile foundation depth is 55m, so the construction is difficult. If the construction quality is not strictly controlled, it will leave hidden dangers to the engineering cost of the LNG tank, the construction period and even the later use safety. In order to prevent similar problems from occurring, it is important to properly handle quality problems and hidden dangers during pile foundation construction.

Prepare technical documents, engineering materials (equipment), and construction equipment before construction. The control work of the on-site construction personnel plays a very important role in the smooth construction. Construction quality supervision is the key to guarantee the construction quality, and a full-process supervision team should be adopted.

1) Control of construction documents. Before construction, the drawings must be carefully reviewed in accordance with the requirements of the procedural documents and relevant management regulations. The corresponding construction drawings and construction plans must be carefully checked and verified, and the design defects and quality problems in the plans should be reported in time to avoid quality problems caused by technical defects. .

2) Control of construction materials. The purchased materials must meet the requirements specified in the design and contract, and witness samples and re-inspection of the incoming materials and equipment in a timely manner. Materials and equipment that do not meet the requirements must be exited; Account. 3) Control of construction equipment. Choosing the right construction equipment plays a key role in ensuring construction quality and improving construction efficiency. During the construction process, the inspection of construction equipment must be strictly strengthened, and construction equipment that does not meet the requirements for use must not be used.

4) Control of construction personnel. Improve the construction organization, the responsibilities of the construction personnel are clear, and each performs his or her own duties. The operator is familiar with the construction process and holds a certificate, and pays special attention to the role of construction technicians and construction foremen.

5) Control of construction environment. A good construction environment is an important condition to ensure the safety and reliability of project quality. In actual project construction, we must pay attention to taking corresponding measures for abnormal environmental conditions, such as winter rainy season, hot season, and windy season. For different seasons, appropriate control measures must be formulated to avoid damage from frost damage, dry cracking, erosion, etc., so as to ensure good project quality.