Precast square pile is a kind of slender concrete precast member made by pretensioning prestress technology. At present, the commonly used pile connection method is welding pile connection.
The prefabricated angle steel frame is sleeved on the pile cap of the pile top that has been pressed into the soil, and the lower ends of the four corners of the angle steel frame are connected with the steel cap by spot welding, and the elevation of the four angles is adjusted to be parallel to the elevation of the four corners of the steel cap, and the spacing is symmetrical and consistent. Only after the positioning is confirmed to be correct can the positioning welding points be properly reinforced to prevent the angle steel frame from deviating or falling off when the previous pile cap is inserted.
After the positioning of the upper angle steel frame of the lower pile cap is completed, lift the upper pile cap to connect with the lower pile, align the upper pile cap with the lower pile cap, slowly insert the angle steel frame downward until the top surfaces of the upper and lower pile caps are completely combined, then adjust the verticality of the centers of the upper and lower piles, and weld and position the upper pile cap and the angle steel frame on the same vertical line, so as to carry out the next overall welding work and complete the pile connection step of precast concrete square piles.
Related background:
China patent cn 10354 1350 disclosed a pile connection method for reinforced concrete square piles on Oct. 20 14 65438+291Oct., including the following steps: before pile connection, removing impurities in the welding range; Alignment of piles: the center deviation of the upper and lower sections of reinforced concrete square piles is less than or equal to 5 mm; Reinforced concrete square piles are symmetrically segmented by electric welding piles; When the pile is connected, the four corners of the reinforced concrete square pile are spot welded firmly. Although the reinforced concrete square pile connected by this technical scheme will not break, it is difficult to locate the upper pile and the lower pile of the concrete square pile during welding, and the pile body is not on the unified vertical center line, which causes quality hidden dangers.
Therefore, there are all kinds of inconveniences and problems mentioned above in the known welding connection mode of concrete square piles.