The invention relates to the technical field of ground static load pile testing, and discloses a double-barrel structure for pile testing, including an outer barrel, an inner barrel placed in the outer barrel, and a plurality of fixed rods used for the relative fixation of the outer barrel and the inner barrel, the inner barrel and the outer barrel having a sliding gap, and the outer barrel is provided with a water injection nozzle connected with the water injection nozzle. Through the sliding clearance, the outer protective barrel is provided with a water stop belt to prevent the water from flowing out of the sliding clearance of the water injection nozzle; when the outer protective barrel and the inner protective barrel are embedded in the inner part of the foundation pit, the outer protective barrel contacts with the soil layer, and the inner protective barrel contacts with the pile body; when multiple fixed bars are cut off, the outer protective barrel and the inner protective barrel can slide The resistance between the outer and inner guard barrels is greatly reduced by injecting water into the sliding gap through the water injection nozzle. When the test pile reaches the age, the fixed rod is cut off, so that the outer guard barrel and the inner guard barrel can slide freely, and the lateral friction of the empty pile section is completely isolated, which effectively ensures the collection to be true and effective. Reliable and effective data detection.
【技术实现步骤摘要】
用于试桩的双护筒结构
本专利技术涉及地面静载荷试桩的
,特别涉及用于试桩的双护筒结构。
技术介绍
随着城市建设快速发展,超高层建筑越来越多,其建筑基础工程桩受力越来越大,为准确计算桩基承载力,在基础工程桩施工前进行桩基静载荷试桩变得越来越有必要。但是,随着深基坑工程的深度加大,工程桩静载荷试桩在基坑底施工的难度也越来越大;尤其是深基坑采用多道砼支撑时结构时,根本无法在基坑底实施工程桩的静载荷试验。现有技术中,一般较深且较大的基坑的基础工程,进行钻孔灌注桩静载荷试验在地面上进行,桩基的承载力由桩端承载力和桩侧摩阻力二部分组成,由于在地面实施静载荷试验,试验结果中包含了深基坑开挖段地层的桩侧摩阻力,无法真实反映基坑底工程桩的承载力实际情况。
技术实现思路
本专利技术的目的在于提供用于试桩的双护筒结构,旨在解决现有技术中实施灌注桩静载荷试验,试验结果不准确的问题。本专利技术是这样实现的,用于试桩的双护筒结构,包括外护筒、置于所述外护筒的内部的内护筒以及多个用于所述外护筒与所述内护筒相对固定的固定杆,所述内护筒与所述外护筒具有滑动间隙;外护筒设有注水口,所述注水口连通所述滑动间隙,所述外护筒设有用于防止所述注水口所注水流出所述滑动间隙的止水带;当所述外护筒以及所述内护筒嵌入基坑内部时,所述外护筒和土层接触,所述内护筒与桩身接触,当割除多个所述固定杆时,所述外护筒以及所述内护筒可相对于滑动。进一步的,当所述外护筒以及所述内护筒嵌入基坑内部时,所述外护筒以及所述内护筒高于地面。进一步的,当所述外护筒以及所述内护筒嵌入基坑内部时,所述注水口置于所述止水带的上方。进一步 ...
【技术保护点】
1.用于试桩的双护筒结构,其特征在于,包括外护筒、置于所述外护筒的内部的内护筒以及多个用于所述外护筒与所述内护筒相对固定的固定杆,所述内护筒与所述外护筒具有滑动间隙;外护筒设有注水口,所述注水口连通所述滑动间隙,所述外护筒设有用于防止所述注水口所注水流出所述滑动间隙的止水带;当所述外护筒以及所述内护筒嵌入基坑内部时,所述外护筒和土层接触,所述内护筒与桩身接触,当割除多个所述固定杆时,所述外护筒以及所述内护筒可相对于滑动。
【技术特征摘要】
1.用于试桩的双护筒结构,其特征在于,包括外护筒、置于所述外护筒的内部的内护筒以及多个用于所述外护筒与所述内护筒相对固定的固定杆,所述内护筒与所述外护筒具有滑动间隙;外护筒设有注水口,所述注水口连通所述滑动间隙,所述外护筒设有用于防止所述注水口所注水流出所述滑动间隙的止水带;当所述外护筒以及所述内护筒嵌入基坑内部时,所述外护筒和土层接触,所述内护筒与桩身接触,当割除多个所述固定杆时,所述外护筒以及所述内护筒可相对于滑动。2.如权利要求1所述的用于试桩的双护筒结构,其特征在于,当所述外护筒以及所述内护筒嵌入基坑内部时,所述外护筒以及所述内护筒高于地面。3.如权利要求1所述的用于试桩的双护筒结构,其特征在于,当所述外护筒以及...
【专利技术属性】
技术研发人员:李超,唐雪云,崔炳辰,雷斌,王荣发,杨静,许国兵,
申请(专利权)人:深圳市工勘岩土集团有限公司,
类型:发明
国别省市:广东,44
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