现浇混凝土夹芯桩(空心桩)成桩工艺的研究

介绍了等效于现浇混凝土空心桩的几种现浇混凝土夹芯桩及其施工方法。在桩体安装好的钢管内,灌入余土制成的砂石混合泥浆,在紧后的拔管过程中,令管内砂石混合泥浆及时填补拔管留下的空间,并对新浇的混凝土桩身内筒壁进行有效护壁,拔管后即形成了连续施工的现浇混凝土夹芯桩。由于夹芯桩等效于空心桩,故解决了现浇混凝土空心桩无法连续施工的难题,节省了桩体多余的混凝土或扩大了桩径,同时余土回灌利用也减少了对环境的污染,具有良好的应用前景。

Study on Pile-forming Technology of Cast-in-place Concrete Sandwich Piles (Hollow Piles)

Several kinds of cast-in-place concrete sandwich piles equivalent to cast-in-place concrete hollow piles and their construction methods are introduced.The steel pipe installed in pile body is filled with sand and stone mixed mud made of residual soil;in the consequent process of pulling out the pipe,the sand and stone mixed mud in the pipe is filled in time to fill the space left by pulling out the pipe,and the inner wall of the newly poured concrete pile is effectively protected;the continuous construction of cast-in-place concrete sandwich pile is achieved after pulling out the pipe.Because the sandwich pile is equivalent to the hollow pile,it solves the problem that the cast-in-place concrete hollow pile cannot be constructed continuously,saves the redundant concrete of the pile body or expands the pile diameter,at the same time,also reduces the pollution to the environment by reuse of residual soil,which has a good application prospect.