The invention discloses a settlement strengthening and jacking leveling technology suitable for the independent pile foundation of an industrial factory building. Firstly, the soft soil around the pile is strengthened by compaction grouting. The reinforcement depth is from shallow to deep, and the grouting pressure is from small to large. Each grouting section is 0.5 to 1.0 m long. After the first grouting section is finished, the drilling is continued to be 0.5 to 1.0 M. The grouting in the second grouting section is carried out step by step down until the compaction grouting is completed. After the reinforcement of the weak soil layer around the pile is completed for 12 to 24 hours, the drilling is continued down and the reaction is formed through high pressure grouting, and the pile foundation is slowly jacked up to the allowable deviation range of the design. The reinforcing jacking method is adopted to reinforce the independent pile foundation to form a wrapped state with good integrity and high stability, which not only enhances the bearing capacity of the whole foundation, but also achieves the purpose of jacking and leveling; the adoption of the drilling-grouting integrated forward grouting technology can avoid the secondary settlement caused by the soil layer weakened by water during the drilling process and the initial grouting. The curing time is short and the radius of diffusion is controllable, the cementing ability is strong, the strength is high, and the environment is free from pollution.
【技术实现步骤摘要】
一种适用于工业厂房独立桩基础的沉降加固顶升调平技术
本专利技术涉及桩基础加固
,具体是一种适用于既有建筑无承台的独立桩基础沉降加固顶升调平技术。
技术介绍
在建筑施工前,对存在较大深度的回填土层或软弱地基进行处理,在不具备天然地基的条件下,大多数建筑需打桩做基础,再施工上部建筑结构。由于地基处理不密实,地基土层具有较大的压缩性,地基承载力不足;或随着地下水的排泄条件的改变,形成地下水侵蚀现象,导致地基承载力降低;或由于桩端与基岩存在软弱夹层;或岩面倾斜度大,桩端入岩深度不够导致侧滑;或桩周土层松,软摩擦系数低等因素导致桩基础发生不均匀沉降。遇到这些情况,则需对桩端软弱土层进行加固处理和顶升调平,以期达到地基承载力要求和设计允许沉降偏差范围内,缩小建筑桩基础之间的高差,保证厂房的结构安全。
技术实现思路
针对上述问题,本专利技术提供一种适用于工业厂房独立桩基础的沉降加固顶升调平技术。一种适用于工业厂房独立桩基础的沉降加固顶升调平技术,先对桩周软弱土层进行压密注浆加固,加固深度由浅至深,分层向下,注浆压力由小到大,每次注浆段长0.5-1.0m,注完第一注浆段后,继续钻进0.5-1.0m,进行第二注浆段的注浆,逐段向下,直至完成压密注浆;桩周软弱土层加固完成12-24h后,继续向下施钻,通过高压注浆,形成向上的反力,缓慢顶升桩基至设计允许偏差范围内。优选的,注浆孔位对称布置,同时钻进,同时注浆;钻孔孔径42mm。优选的,浆体采用高铝铁特种复合浆液;施工作业时,浆液初凝时间控制在15s~25s,浆液扩散半径控制在1.5m~2.0m。本专利技术的有益效果:1.加固 ...
【技术保护点】
1.一种适用于工业厂房独立桩基础的沉降加固顶升调平技术,其特征在于,先对桩周软弱土层进行压密注浆加固,加固深度由浅至深,分层向下,注浆压力由小到大,每次注浆段长0.5‑1.0m,注完第一注浆段后,继续钻进0.5‑1.0m,进行第二注浆段的注浆,逐段向下,直至完成压密注浆;桩周软弱土层加固完成12‑24h后,继续向下施钻,通过高压注浆,形成向上的反力,缓慢顶升桩基至设计允许偏差范围内。
【技术特征摘要】
1.一种适用于工业厂房独立桩基础的沉降加固顶升调平技术,其特征在于,先对桩周软弱土层进行压密注浆加固,加固深度由浅至深,分层向下,注浆压力由小到大,每次注浆段长0.5-1.0m,注完第一注浆段后,继续钻进0.5-1.0m,进行第二注浆段的注浆,逐段向下,直至完成压密注浆;桩周软弱土层加固完成12-24h后,继续向下施钻,通过高压注浆,形成向上的反力,缓慢顶升桩基至设计允许偏差范围内。2.根据权利要求1所述的适用于工业厂房独立桩基础的沉降加固顶升调...
【专利技术属性】
技术研发人员:吴继光,崔腾跃,崔学栋,
申请(专利权)人:北京恒祥宏业基础加固技术有限公司,
类型:发明
国别省市:北京,11
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