Inclined pile construction method of hydraulic static pile driver and portal frame assembly

Abstract

The invention discloses an inclined pile construction method of a hydraulic static pile driver. The method comprises the following steps that (1) a portal frame assembly is arranged on hydraulic static pile driving equipment; (2) a prefabricated pile is lifted, placed and fixed into a pile clamping device assembly; (3) the construction angle and the construction path of the prefabricated pile areset, the inclined angle of the portal frame assembly is adjusted through a rotary shaft and an amplitude changing rotary oil cylinder on the portal frame assembly, the prefabricated pile on the pile clamping device assembly reaches the preset construction angle, and the pile point direction of the prefabricated pile is aligned to the pile center; and (4) the fabricated pile is pressed into a foundation through a pile driving oil cylinder, and when a single pile driving stroke is completed, the pile clamping device assembly is started, and the steps (2) and (4) are repeated till the prefabricated pile is pressed to design depth. The invention discloses the middle portal frame assembly. The portal frame assembly, is arranged at the geometric center position of pile driving equipment, the gravity center of the equipment is kept within a safe range all the time, the overall balance of the equipment can be guaranteed, and equipment safety can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of hydraulic static pile drivers, in particular to a construction method for inclined piles of a hydraulic static pile driver and a gantry assembly. Background technique [0002] At present, hydraulic pile drivers or gas-hydraulic linkage pile drivers are generally used to construct pile foundations. Hydraulic pile drivers are popular among users for their low noise and low impact on the environment. The hydraulic pile driver generally includes a construction platform and a crane arranged on the construction platform, a gantry frame, a control room and a hydraulic pile pressing mechanism, and the hydraulic pile pressing mechanism is installed on the gantry frame. But the hydraulic pile machine of prior art, because the pile-pressing angle of its pile-pressing mechanism can not be adjusted, therefore generally can only directly construct the pile foundation of vertical structure, promptly can only be applicab...

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Problems solved by technology

[0006] 1. Since the gantry and pile clamps are set at the front of the support platform, the space for the cylinder body of the luffing cylinder and its piston rod on the support platform is limited, and only the first-stage oil cylinder has a luffing range of only 0± 15°, short stroke, it is difficult to achieve inclination of 20° and above with a large inclination angle and long stroke, which limits its scope of application, and is only suitable for pile pressing operations of prefabricated support piles with small variable amplitude inclination angles and short strokes; 2. Due to The overall center of gravity of the pile driver is also at the front of the supporting platform. Under the pile-pressing working state, the force on the front and rear of the supporting platform is uneven, and the front is prone to local subsidence under heavy pressure, which affects the overall stability of the equipment and piling. Accuracy; 3. Since the gantry and the pile clamp are set at the front of the support platform (that is, the side facing away from the crane and facing the working face), it is not easy to keep the center of gravity at the center of the equipment during the pile pressing process. The central position, and when it is in the non-pile working state, the overall center of gravity of the pile driver is also at the front of the support platform, and it is not easy to control its overall balance during the process of moving the machine or shifting (because it is under dynamic conditions) machine balance), thus affecting the speed of moving or shifting

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