Foundation pit supporting-free prefabricated inclined pile support double-row construction method and construction equipment

Abstract

The invention discloses a foundation pit supporting-free prefabricated inclined pile support double-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 A1 isset, 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 A1 into a foundation; (5) the pile pressing oil cylinder completes a single stroke, 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, a long ship assembly moves front and back to the next station; (7) support piles A2 are lifted, placed and fixed to the pile clamping device assembly throughthe crane assembly; (8) the pile pressing angle of the support piles A2 is set, the pile pressing oil cylinder statically presses the support piles A2 into the foundation, and double rows of piles are formed; (9) a short ship assembly moves left and right to the next station; 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 static pile drivers, in particular to a double-row construction method and construction equipment for foundation pit unsupported prefabricated inclined pile support. 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 engi...

AI Technical Summary

Problems solved by technology

[0013] 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, 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 the pile pressing operation of prefabricated support piles with small amplitude inclination angle and short stroke; The overall center of gravity of the pile driver is also at the front of the supporting platform. Under the pile pressing working condition, 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 the piling accuracy. ; 3, because its gantry and pile clamps are arranged on the front portion of the support platform (i.e., the side facing away from the crane and towards the working face), the overall center of gravity of the pile driver in the non-pile-pressing working state is also Located at the front of the supporting platform, it is not easy to control its overall balance during the process of moving or shifting (especially the balance of the whole machine under dynamic conditions), which affects the safety of the device and affects the speed of moving or shifting. Long machine time consumption, high energy consumption, slow construction speed, and low accuracy of the inclination angle and position of the pile press-in, which affect the 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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