- 摘 要
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（1 清遠(yuǎn)市建設(shè)工程綜合服務(wù)站， 清遠(yuǎn) 511500； 2 廣東省建設(shè)工程質(zhì)量安全檢測總站有限公司， 廣州 510075；3 廣東省基礎(chǔ)工程集團(tuán)有限公司， 廣州 510620； 4 廣東建設(shè)職業(yè)技術(shù)學(xué)院土木工程系， 廣州 510450）
［摘要］為了解決在建結(jié)構(gòu)主體中因引孔靜壓成樁后引孔深度大于管樁樁底深度形成樁底脫空問題，在比選工程中常見樁基加固方法（注漿、錨桿靜壓鋼管樁、微型灌注樁、微型鋼管樁）的基礎(chǔ)上，采用了微型鋼管樁預(yù)應(yīng)力封樁加固技術(shù)方案，同時對該加固方案進(jìn)行了設(shè)計(jì)，并介紹了其施工工藝。最后，對加固后本工程的單樁進(jìn)行豎向抗壓靜載試驗(yàn)和建筑變形監(jiān)測。結(jié)果表明，加固樁極限承載力Qu≥1 300kN，滿足鋼管樁設(shè)計(jì)承載力650kN要求，監(jiān)測的沉降變形比較穩(wěn)定，趨于收斂。
［關(guān)鍵詞］樁基加固；微型鋼管樁；預(yù)應(yīng)力封樁；引孔靜壓樁
中圖分類號：TU354文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)08-0115-04
Technical scheme and application of pile foundation reinforcement for a high-rise building under construction
LI Shan1, WANG Kai2, SHAO Mengxin3, ZENG Xin4
(1 Qingyuan Combined Services Station of Building Construction, Qingyuan 511500, China; 2 Guangdong Construction Engineering Quality and Safety Inspection Station Co., Ltd., Guangzhou 510075, China; 3 Guangdong Foundation Engineering Group Co., Ltd., Guangzhou 510620, China; 4 Department of Civil Engineering, Guangdong Construction Polytechnic, Guangzhou 510450, China)
Abstract:In order to solve the problem of void at the bottom of the pile caused by reason that the depth of leading hole is greater than the depth of pipe pile bottom after jacked pile for pre-bored hole in the main structure under construction, the reinforcement technology of micro-steel-piles of sealed piles with prestress was adopted based on the comparison of the common pile foundation reinforcement methods in engineering (grouting, anchor rod static pressure steel pipe pile, micro cast-in-place pile, micro steel pipe pile). At the same time, the reinforcement scheme was designed and its construction technology was introduced. Finally, vertical compression static test and building deformation monitoring on the single pile of the project after reinforcement were caried out. The results show that the ultimate bearing capacity of the reinforced pile Qu ≥1 300kN, which meets 650kN of the design bearing capacity of steel pipe pile, the settlement deformation monitored is stable and tends to converge.
Keywords:pile foundation reinforcement;micro steelpipe pile;sealed pile with prestress;jacked pile for pre-bored hole
作者簡介：李善，碩士，工程師，注冊土木工程師（巖土），Email:729730018@qq.com。
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