预制钢筋混凝土长桩在起吊运输和施工阶段受力状态极为不利。所以,桩身配筋常由吊装控制。在主要承受垂直荷载的桩基中,当桩入土以后,按吊装应力而配置的钢筋就显得多余。为此,把长桩分为几段短桩,逐段沉入土中,可以减少钢筋用量,改善桩基经济效果。以断面为40×40厘米、长度为24米的预制桩为例,如果采用整根预 The prestressed reinforced concrete long piles are extremely unfavorable in the lifting and transportation and construction phases. Therefore, pile reinforcement is often controlled by lifting. In pile foundations that are mainly subjected to vertical loads, when the pile is inserted into the soil, the reinforcements arranged according to the lifting stress become superfluous. For this reason, the long pile is divided into several short piles, which are submerged into the soil section by section, which can reduce the amount of steel bars and improve the economic effect of the pile foundation. Take a prefabricated pile with a section of 40 x 40 cm and a length of 24 meters as an example.