Pile driving mechanism of hydraulic compression pile driver in Larsen steel sheet pile
The traditional dynamic steel sheet pile driver is the use of vibration and impact of the Larsen steel sheet pile into the formation of the pile of machinery, the common Larsen steel pile pile piling equipment with robotic piling machine (digging machine + vibration hammer), vibration hammer piling (track Hanging + vibration hammer) and so on.
Larsen steel sheet pile static pressure pile driver is applied with all kinds of traditional pile driver completely different pile into the process mechanism. Larsen steel pile pile static pressure pile driver is used by clamping several has been pressed into the ground Larsen steel sheet pile, pull out the resistance as a reaction force, the use of static load will be the next pile into the ground pressure Into the mechanism ". Larsen steel sheet pile static pressure pile driver and the use of the Earth as the integration of the reaction force, to achieve a small machine can also play a strong ability to the purpose. After years of practice, the use of the principle of the development of mature environment-friendly press method (The Press-in Method).
Pressing method of hydraulic compression pile in Larsen steel sheet pile
The most appropriate press method is usually selected according to geological conditions. For the standard penetration test N value of 25 below the relatively weak formation, can be used static load into the "single press method"; when the N value of more than 25, the use of high-pressure water "water knife auxiliary pressure method" or "Spiral Drill Assisted Pressing Method".
Construction Characteristics of Static Pressure Larsen Steel Sheet Pile
1、no vibration, will not cause damage to the surrounding adjacent buildings;
2、no noise, especially the city center, adjacent to the district and other places on the relatively high noise requirements;
3、the need for small construction area, the machine group width of not more than 1.4 meters;
4、can be as close as possible adjacent to the construction, from the center line to the neighbors only 60cm can;
5、for special strata such as sand, gravel layer has a better construction capacity.
Classification of Pressing System for Hydraulic Pile in Larsen Steel Sheet Pile
1、alone into the method
Use equipment: Larsen steel sheet pile static pressure pile driver + power unit
The method is applicable to the soft formation with N value below 25, and the construction method of the Larsen steel sheet pile is put into the ground by static load by the pressing force of the Linchen steel sheet pile.
2、water knife auxiliary pressure method
Use equipment: Larsen steel pile pile static pressure pile driver + power unit + water pipe reel + high pressure water pump
The method is applicable to a hard layer with an N value of 25 or more. By injecting high pressure water into the formation at the tip of the press pile, the gap between the soil particles increases instantaneously and the soil particles become easy to move Pile end resistance. At the same time, it is possible to reduce the resistance between the frictional resistance of the pile and the interlocking force, and press and apply with a small pressing force. But also to prevent damage to the pile. The amount of jet water can be adjusted in accordance with the construction conditions, the impact of the formation will be controlled to a minimum, to achieve high efficiency into the construction.
3、spiral drill auxiliary pressure method
Use equipment: Larsen steel sheet pile static pressure pile driver + power unit + auger device
The method of work in the gravel, pebble or rock and other hard layer, the use of the original "core removal theory" in the press at the same time through the auger drilling to reduce penetration resistance, in order to achieve pressure into the operation. The "auger device", which is linked to the main body of the Lincoln steel sheet pile static pressure pile driver, minimizes the formation beneath the front end of the drilling pile, and prevents the pile from penetrating into the ground while suppressing the occurrence of the ball. Due to less soil, it will not destroy the surrounding strata, can quickly build a strong support for the completion of the pile. This method can be applied to soft rock Ⅰ, soft rock Ⅱ and medium hard rock such as mudstone, sandstone and granite.
4、rotating cutting press into
Equipment used: screwed into the Larsen steel sheet pile static pressure pile driver + power unit + water system
The method can not only overcome the gravel layer or rock and other hard geology, but also in the boulder or reinforced concrete structures and other underground obstacles under the conditions of the realization of rotary cutting into the construction. The pressure into the technology greatly broaden the scope of the use of pressure into the law. Use the "screw-in static pressure pile driver" to rotate the front end of the steel pipe with drill teeth, cutting through the underground obstacles into the press. In addition to the construction of the principle of non-vibration, no noise and other construction advantages, through the use of the special end of the pile, to achieve a minimum of cutting, the effective control of the amount of soil, the impact of the environment to control the minimum range. In the realization of the environmental protection construction at the same time also inhibited the pile of the core and deformation, to build a high reliability, high precision completion of the pile.
5、GRB system (Giken Reaction Base System)
Will be the "handling" of the pile "lifting" "pressure into" and a series of operations systematization, so that all of the above operations have been completed on the pile, that is, "no temporary construction" to maximize the project construction efficiency , Creating a landmark with a new type of construction model. Because of this system construction without the need to build temporary piers, roads and other large temporary works, Bridge steel sheet piles protection so in the water, sloping areas, uneven areas, narrow areas and low space lots and other special field conditions obvious advantages.