(1 中原工学院建筑工程学院, 郑州 451191; 2 河南交院工程技术集团有限公司, 郑州 450007)

摘要: 为了提高检测设备安装的效率,分析了基桩承载力检测中钢筋连接的特点,提出了锚具⁃螺栓钢筋连接方法,并将其与焊接连接方法进行了技术经济比较. 对 5 个锚具⁃螺栓钢筋连接件进行了拉伸试验研究,主要考察了锚具、螺栓和挡板三者之间的约束关系对连接件承载力的影响. 结果表明:与焊接连接方法相比,锚具⁃螺栓钢筋连接方法具有安装便捷、成本低廉和可循环使用等优势,在基桩承载力检测中,具有替代焊接连接方法的潜力;锚具⁃螺栓钢筋连接件主要破坏类型为螺栓拉断和钢筋拉断,螺栓孔距锚具越近,钢筋连接效果越好;当挡板与锚具、螺栓采用刚性连接时,螺栓抗拉强度得到充分利用;屈服位移在 20 ~ 30mm 之间,满足基桩承载力检测对钢筋连接的要求;屈服荷载可以作为锚具⁃螺栓钢筋连接件承载力设计值的指标. 最后根据锚具⁃螺栓钢筋连接件破坏特征建立了其设计方法.

关键词: 基桩承载力检测; 钢筋连接; 焊接连接; 锚具⁃螺栓连接

中图分类号:TU473 文献标志码:A 文章编号:1002⁃848X(2022)08⁃0140⁃06

DOI:10. 19701 / j.jzjg.20210926

Experimental study and design method for anchorage⁃bolt splicing of steel bars

YIN Xiaosan1,2, XU Huihui1, SHAO Jinggan2

(1 School of Architectural and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 451191, China;2 Henan Jiaoyuan Engineering Technology Group Co., Ltd., Zhengzhou 450007, China)

Abstract:In order to improve the installation efficiency of the testing equipment, the characteristics of steel bar splicing inthe bearing capacity testing of foundation piles were analyzed, and the anchorage⁃bolt splicing method of steel bars was putforward, which was compared with welding connection method in technical economy. The tensile test study of 5 anchorage⁃bolt steel bar connectors was carried out, and the influence of the restraint relation among anchorages, bolts and orificeplate on the bearing capacity of the connectors was mainly investigated. The results show that compared with the weldingconnection method, the anchorage⁃bolt splicing method of steel bars has the advantages of convenient installation, low costand recyclability, so it has the potential to replace the welding connection method in the foundation piles testing. The mainfailure types of anchorage⁃bolt connectors are bolt pull cut and steel bar pull cut. The closer the bolt hole is to theanchorage, the better connection effect of the steel bar is. When the orifice plate is rigidly connected with the anchor andthe bolt, the tensile strength of the bolt is fully utilized. The yield displacement is between 20mm and 30mm, which meetsthe requirements for the connection of steel bars in the bearing capacity testing of the foundation pile. The yield load can beused as an indicator of the design value of the bearing capacity of the anchorage⁃bolt steel bar connectors. Finally, thedesign method is established according to the failure characteristics of the anchorage⁃bolt steel bar connectors.

Keywords:bearing capacity testing of foundation pile; splicing of steel bar; welded connection; anchorage⁃bolt splicing

∗河南省高等学校重点科研项目(20A560025、22A560007),河南省交通运输厅科技计划项目(2020J⁃2⁃20),教育部产学合作协同育人项目(201901273059).

第一作者:殷晓三,博士,讲师,主要从事工程检测与加固研究,Email:yinxiaosan_3@ 126.com.

[引用本文] 殷晓三,许慧慧,邵景干. 锚具⁃螺栓钢筋连接试验研究与设计方法[J]. 建筑结构,2022,52(8):140⁃145. YIN Xiaosan, XU Huihui, SHAO Jinggan. Experimental study and design method for anchorage⁃bolt splicing of steelbars[J]. Building Structure,2022,52(8):140⁃145.