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常见问题解答

业臻建材预制桩的特点

来源: 时间:2015-09-23 16:42:00 浏览次数:

1)桩的单位面积承载力较高, 由于其属挤土桩,桩打人后其周围的土层被挤密,从而提高地基承载力;    


2)桩身质量易于保证和检查;适用于水下施工;桩身砼的密度大,抗腐蚀性能强;施工工效高;因其打入桩的施工工序较灌注桩简单,工效也高;    


3)预制桩单价较灌注桩高。预制桩的配筋是根据搬运、吊装和压人桩时的应力设计的,远超过正常工作荷载的要求,用钢量大,接桩时,还需增加相关费用;    


4)锤击和振动法下沉的预制桩施工时,震动噪音大,影响周围环境,不宜在城市建筑物密集的地区使用,一般需改为静压桩机进行施工;    


5)预制方桩是挤土桩,施工时易引起周围地面隆起,有时还会引起已就位邻桩上浮;  


6)受起吊设备能力的限制,单节桩的长度不能过长,一般为10余米,长桩需接桩时,接头处形成薄弱环节,如不能确保全桩长的垂直度,则将降低桩的承载能力,甚至还会在打桩时出现断桩;  


7)不易穿透较厚的坚硬地层,当坚硬地层下仍存在需穿过的软弱层时,则需辅以其他施工措施,如采用预钻孔(常用的引孔方法)等。



1) the bearing capacity of the unit area of piles is higher, because of the soil compaction pile, the soil layer around the pile is compacted, thus improving the bearing capacity of the foundation.;

2) quality of pile body is easy to check and ensure; workover is suited for underwater applied; the density of the pile body concrete, strong corrosion resistance performance; high construction efficiency; because of its into the pile construction process than perfusion pile simple, work efficiency is high;

3) the unit price of precast piles is higher than the pouring piles. The reinforcement of the precast piles is designed according to the stress of carrying, hoisting and piling, far more than the normal working load, and it need to increase the relevant expenses when the steel is large and the pile is connected.;

4) hammer and method of vibration sinking precast pile construction, the vibration noise, affecting the surrounding environment, should not be used in city building dense areas, it generally takes change for static pressure pile machine construction;

5) precast piles are crowded piles, which can easily lead to uplift of surrounding ground, sometimes caused by the uplift of piles.;

6) is limited by the ability of lifting equipment, single section pile length should not be too long, generally more than 10 meters, long pile for pile splicing and joints formed weak link, if not to ensure the whole pile verticality, it will reduce the bearing capacity of the pile, even at the time of driving appear broken pile;

7) it is hard to penetrate thick hard strata, and when the hard strata still exist in the weak layer, then need to be supplemented with other construction measures, such as the use of pre drilling (commonly cited hole method), etc..

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