Damage control method for blasting excavation of offshore rock-socketed pile foundation

Abstract

The invention provides a damage control method for blasting excavation of rock-socketed pile foundations in the sea, comprising: sinking the casing to a designated position, drilling a vertical blasthole according to the blasting design; filling sea sand / rock debris into the bottom of the blasthole for buffering Layer laying; place the special combination packaged in an elastic sealed bag at the casing port, and let it fall to the buffer layer by gravity; the special combination includes: a waterproof elastic sealed bag, and placed in the waterproof elastic sealed bag from bottom to top The high-pressure inflatable airbag, iron ball, charge section, and the inflatable tank installed inside the high-pressure inflatable airbag; install the upper seismic source charge column; block the blast hole, pull out the casing, and connect each blast hole to the Internet. The explosive column is detonated by a detonator to carry out rock foundation blasting. The method can effectively control the blasting damage of the pile foundation rock mass, ensure the bearing capacity of the rock-socketed pile foundation, and at the same time enhance the excavation effect of the rock mass to be broken, fully protect the pile foundation rock mass, and is especially suitable for offshore rock-socketed piles under deep water conditions excavation.

Description

Technical field[0001]The present invention belongs to the field of engineering blasting, and specifically, a method of controlling the damage of sea rock base burst.[0002]technical background[0003]With the development of the economy and the increasing environmental pollution, the demand for cleaning energy is increasing. The sea wind energy has a lot of advantages such as stable wind, energy storage, and cleaning and non-pollution, has now become the focus of energy development in all countries in the world. The structural type of the sea wind power base can be divided into gravity foundation, single pile foundation, and suction cylindrical basis. With the vigorous development of my country's sea wind power industry, the large-diameter single pile foundation has become the most commonly used basis for the operation period due to its large carrying capacity, high security, simple structure, easy operation period. In order to improve the shallowness of the sea bed covering layer in so...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN108645300A discloses "a composite reflective energy gathering and buffer energy dissipation device and its blasting construction method", which is characterized in that the compound reflective energy gathering and buffer energy dissipation device (mainly including buffer energy dissipation pads) arranged at the bottom of the hole layer, rigid cushion, reflective energy-concentrating cushion and energy-concentrating jet) to reduce the blast energy entering the bottom of the hole, thereby reducing the blasting damage at the bottom of the blasthole. The blasting damage control effect of this device is good, but the structure is complex and On-site construction is inconvenient; Chinese patent CN109870086A discloses "a high-wave impedance directional sliding composite energy dissipation body suitable for rock foundation excavation and formation", which is characterized in that a composite energy dissipation structure that can be quickly constructed is proposed in the design. The bottom of the hole can achieve the double effect of strengthening the rock mass breaking on the foundation surface and protecting the rock mass at the bottom of the hole. This structure has strong field operability and good excavation and forming effect, but its structure is single, and its damage control effect is difficult under deep water loads. ensure

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