Gravel and #12539; Pebble layer or rock &; # 12539; Hard geology, such as bedrock, will also press the pile into it. At the same time, the penetration resistance is reduced by the effect of spiral drilling, and the original "coring theory" of technical research is realized. The auger system integrated with the static pressure pile planter firstly digs the ground below the pile end, pulls the auger out of the ground while suppressing the pressure ball, and penetrates the pile into the ground by filling the pull-out gap. By overcoming the hard geological construction method, steel sheet piles can be pressed into soft rock ⅰ, soft rock ⅱ and medium-hard rock layers such as mudstone, sandstone and granite.
superiority
Except for core pressing, drilling and excavation are only limited to the minimum range as the core pressing assistance, so the amount of soil discharged is small, and the surrounding foundation will not be damaged, thus realizing the pile-forming construction with strong support. In addition, all machinery and equipment firmly grasp the completed piles, so there is no danger of dumping, and the impact of the project is reduced to a small range only by using the width of construction machinery, so even under the conditions of rivers, inclined lots, narrow lots and low-spacing lots. There is no need to temporarily erect shallow bridges or bypass roads, only the original wall construction project is carried out, and the temporary construction is realized. Therefore, the combination of auger and pressure penetration can realize safe construction while protecting the environment, and effectively reduce the penetration resistance in hard geology.
This is the water jet method:
When the steel sheet pile is pressed into the sandy foundation, the penetration resistance can be effectively reduced by using water injection pressure. The nozzle installed near the pile tip can enhance the interstitial water pressure between soil particles by spraying high-pressure water, creating a temporary state in which soil particles can move easily. At the same time, the high-pressure water sprayed to the ground reduces the friction between the pile surface and the soil, which can prevent the soil from entering the lock and compacting. After piling to a certain depth, take back the nozzle and hose.
The combination of water jet and water jet reduces the penetration resistance, and can complete the pile sinking construction with less driving force without damaging the pile. The flow and pressure of spraying water can be adjusted according to the construction situation, and the influence on the foundation will be controlled to a minimum. In the driving method, the water jet driving pile can provide enough reaction force, which shows that the surface friction of the water jet driving pile can quickly return to normal after construction.