One-time blasting excavation forming method of offshore rock-socketed pile foundation

Abstract

The invention discloses a one-time blasting excavation molding method for rock-socketed pile foundations on the sea. The construction procedure of the method is: erecting a drilling rig platform; drilling a hole with a geological drilling rig; protecting the hole with a casing; Pile steel pipe; slag cleaning in steel pipe; concrete pouring. Among them, the large-diameter middle hole is not filled with explosives, and the contour hole is filled with explosives continuously. The auxiliary hole and the cutout hole are filled with explosives at intervals and iron balls are placed at each interval of the cutout hole; the layered and segmented detonation method is adopted. . The invention adopts the excavation method of blasting method, and one blasting excavation is formed: the contour hole can be oriented to form a seam; the iron ball placed in the cut hole has an energy gathering effect, which can strengthen the internal blasting effect; The role of slag. The invention can effectively solve the problem that the large-aperture drilling rig is difficult to be in place in the current excavation method of the offshore rock-socketed pile foundation pit. The method has the advantages of simple process, conventional machinery, high construction efficiency, and low construction cost.

Description

technical field [0001] The invention belongs to the technical field of foundation pit excavation for offshore wind power foundations, and in particular relates to a forming method for one-shot blasting excavation of offshore rock-socketed pile foundations. Background technique [0002] In recent years, with the increasing consumption of resources and the reduction of non-renewable energy sources, the development and utilization of clean energy have received more and more attention. Offshore wind power occupies an important proportion in the development and utilization of clean energy due to its rich resources, high power generation efficiency, and suitability for large-scale development. [0003] Offshore wind power often needs to face harsh conditions including typhoon, surf, etc., and because the bedrock on the seabed is often covered with overburden, the geological conditions of the bedrock are complex, which adds a lot of difficulties to the pile foundation construction ...

AI Technical Summary

Problems solved by technology

At present, large-diameter rock-socketed pile foundation pits are excavated by large-diameter drilling rigs at one time, but with the increase of wind power installed capacity, the size of rock-socketed pile foundation pits is increasing day by day. The supply of drilling rigs is in short supply, which seriously affects the construction progress; and due to the lithology of the deep complex stratum in the overburden layer, the piling process of steel pipe piles is easy to cause the outer and inner mouth of the bottom pipe wall, which affects the subsequent construction steps such as mechanical expansion. long cycle

However, when constructing in a complex offshore environment, the construction is greatly affected by the weather, and the effective construction period is very short. It is necessary to adopt an economical and efficient foundation pit excavation method to meet the needs of offshore wind turbine construction.

[0004] There are many new ideas in the existing rock-socketed pile foundation excavation methods, but it is difficult to reduce costs and speed up the construction progress while effectively meeting the structural design and construction requirements

Patent No. CN 108842807 A "Construction Technology for Implanted Rock-socketed Single Pile for Offshore Wind Power Foundation" uses platform-assisted positioning and steel casings for rock-socketed construction, which can effectively improve the horizontal resistance and pull-out resistance of rock-socketed piles capacity, but the operation is complex and requires the cooperation of the main crane and the auxiliary crane for construction, the construction period is long and the cost is high

[0005] Patent No. CN106088140 A "A Construction Technology of Rock-socketed Single Pile Foundation for Offshore Fans on Rock Seabed" proposes a construction technology of "drilling-drilling-drilling". Carry out drilling and excavation to the design elevation, and finally use the hydraulic impact hammer to sink the pile to the design elevation. This method uses the drilling rig to excavate or reduce the strength of the bedrock, which depends on the drilling rig. The construction period is long and is limited by machinery. higher cost

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