Foundation pit supporting-free prefabricated support pile single-row construction method and middle inclined pile press machine

Abstract

The invention discloses a foundation pit supporting-free prefabricated support pile single-row construction method. The method comprises the following steps that (1) a middle inclined pile press machine is arranged; (2) support piles A1 are lifted, placed and fixed to a pile clamping device assembly through a crane assembly; (3) the pile pressing inclined angle of the support piles is set, and a portal frame assembly is subjected to amplitude changing to the needed angle through an amplitude changing oil cylinder; (4) a pile pressing oil cylinder statically presses the support piles into a foundation; (5) a single stroke is completed, the pile clamping device assembly is loosened, and the processes of clamping and pile pressing are repeated; (6) after the piles are driven to preset depth,the pile clamping device assembly is loosened, a long ship assembly overall moves left and right to the next construction position; (7) support piles A2 are lifted, placed and fixed to the pile clamping device assembly through the crane assembly; (8) the pile pressing angle is set, the support piles A2 are pressed into the foundation, and piles in row are formed; (9) construction of the station iscompleted, and the machine moves to the next station construction position; and (10) the steps from (2) to (9) are repeated. The invention further discloses the middle inclined pile press machine implementing the method.

Description

technical field [0001] The invention relates to the technical field of hydraulic pile drivers, in particular to a single-row construction method for unsupported prefabricated support piles in foundation pits and a middle-mounted inclined pile driver. Background technique [0002] In order to ensure the safety and stability of the underground space formed by the excavation of the ground during the construction of the underground structure, the retaining structure, groundwater control, environmental protection and other measures are called foundation pit engineering. The industry standard of the People's Republic of China "Technical Regulations for Building Foundation Pit Support" JGJ120-2012 defines the foundation pit support as follows: in order to protect the safety of the underground main structure construction and the surrounding environment of the foundation pit, temporary supports, Measures for reinforcement, protection and groundwater control. [0003] Foundation pit ...

AI Technical Summary

Problems solved by technology

[0010] 1. Since the gantry and pile clamps are set at the front of the support platform, the space for setting the cylinder body and the piston rod of the luffing cylinder on the support platform is limited, and only the first-stage oil cylinder has a luffing range of only ±15 °, the stroke is short, and it is difficult to realize the inclination of 20° and above with a large inclination angle and a long stroke, which limits its scope of application, and is only suitable for pile pressing operations of prefabricated support piles with small amplitude inclination angles and short strokes; 2. Due to its The gantry and pile clamps are set at the front of the support platform (that is, the side facing away from the crane and facing the working face), so that the overall center of gravity of the pile driver is also at the front of the support platform in the non-pile pressing state. part, it is not easy to control its overall balance in the process of moving or shifting (it is the balance of the whole machine under dynamic), thus affecting the speed of moving or shifting; 3, because the overall center of gravity of the pile driver is also It is at the front of the supporting platform. Under the working state of pile pressing, the force on the front and rear of the supporting platform is uneven, and the front part is prone to local subsidence under heavy pressure, which affects the overall stability of the equipment and the piling accuracy; 4. During the construction of multi-level support such as vertical + inclined combined single-row support piles and inclined + inclined combined single-row support piles under the condition of no support in the pit, the direction design of the support platform and the gantry assembly is unreasonable , and after each supporting pile pressing operation is completed, it is necessary to move the machine to work on the next supporting pile. The moving machine takes a long time, high energy consumption, slow construction speed, and the inclination angle of the pile body and position accuracy is low, affecting construction efficiency and cost

Especially in the construction of large-scale projects, the construction efficiency of multi-stage support piles is lower and the cost is higher.

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