Recently, a water conservancy lifting pump station project applied, in deep-hole vibroflotation gravel pile construction,the "plum-blossom guide rod + shock-absorbing guide rod" independently developed by Beijing Vibroflotation Engineering Machinery Co., Ltd.combined technology, successfully overcoming a series of construction challenges brought by deep liquefiable strata. Today, we will provide an in-depth interpretation of this "rigid-flexible combined" vibroflotation tool.

We broke through the design framework of traditional smooth circular guide rods and innovatively created a multi-lobed plum-blossom-shaped special-section guide rod, achieving comprehensive leaps in bending stiffness, guiding precision, and functional integration, with four technological innovations directly addressing key construction issues.

The multi-lobed special section gives the guide rod bending resistance far exceeding that of a circular rod of the same diameter. During densification, the guide rod stays straight without bending and stable without rotating, fundamentally eliminating the risks of wire rope entanglement and cable pulling and breakage; the embedded high-strength bolt connection is compact and firm, greatly improving both the safety factor and equipment service life.

We optimized the internal material discharge channel, significantly increasing the stone material passage diameter and completely eliminating the chronic problem of material clogging through structural innovation. Crushed stone falls continuously and evenly, making the formed pile dense and full, effectively preventing quality hazards such as pile breakage and hole shrinkage, and providing solid assurance for the density of every pile.

The plum-blossom ridges reciprocate up and down with the vibrator, forming multi-directional shear disturbance on the soil around the pile and strongly promoting soil particle rearrangement. The density and internal friction angle of the soil between piles are significantly improved; under the same power, diameter expansion is more stable, and the replacement rate and bearing capacity of the composite foundation rise simultaneously. For sandy soil, it can further accelerate the dissipation of excess pore water pressure, fundamentally enhancing liquefaction resistance.

The guide rod has lower downward resistance, and the hole-forming process is straight and precise, effectively solving the problem of deviation in deep holes, ensuring accurate pile positions and uniform coverage of the reinforcement range, and providing precise support for overall foundation treatment quality.

If the plum-blossom guide rod wins through "rigidity," then the shock-absorbing guide rod, installed above the vibrator and below the plum-blossom guide rod, protects through "flexibility." The strong impact and lateral swing generated by high-frequency operation of the vibrator are efficiently absorbed and attenuated through the internal buffer structure of the shock-absorbing guide rod, greatly reducing longitudinal impact and lateral swing. This not only reduces fatigue damage to the guide rod and machinery but also keeps the operating platform stable and controllable, providing reliable assurance for long-term continuous high-intensity construction.

Combining rigidity and flexibility to create a new benchmark for efficient and reliable vibroflotation

The plum-blossom guide rod focuses on anti-twist, material guiding, compaction, and multi-directional vibration transmission, while the shock-absorbing guide rod focuses on buffering and shock absorption. The two work in coordinationto integrate six major functions—anti-twist, material guiding, compaction, silt discharge, shock absorption, and multi-directional vibration transmission—into one.This combined technology has withstood comprehensive testing under complex deep-hole working conditions in this project and has become a key support for the project's progress on schedule.