Primary blasting excavation molding method for seaborne socketed pile foundation

Abstract

The invention discloses a primary blasting excavation molding method for a seaborne socketed pile foundation. The primary blasting excavation molding method comprises the following construction procedures of: erecting a drilling rig platform; carrying out pore-forming by a geological drilling rig; sleeving for hole protection; adding explosives in a borehole for detonation; carrying out lower combination on socketed pile steel pipes; removing slags in the steel pipes; and carrying out concrete pouring. A large-diameter middle empty hole is not filled with the explosives, outline holes are continuously filled with the explosives, auxiliary holes and slotting holes are filled with the explosives at segmented intervals, an iron ball is placed in each segment of interval of the slotting holes,and a layered and segmented detonation way is adopted. According to an excavation method through a blasting method, primary blasting excavation molding is realized, the outline holes can form a slotdirectionally, the iron balls placed in the slotting holes have an energy gathering effect, an internal blasting effect can be reinforced, and a slag pushing function can be performed after the central slotting hole detonates. According to the primary blasting excavation molding method disclosed by the invention, the problem in an existing seaborne socketed pile foundation pit excavation method that a large aperture drilling jig is difficult to reach a proper position in time can be effectively solved. The method has the advantages of a simple technology, high construction efficiency, low construction cost and the like, and adopted machines are conventional.

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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