预留灌浆孔螺栓锚头连接方式性能模拟及参数分析

为准确模拟桥梁预制拼装墩台间预留灌浆孔螺栓锚头连接的力学性能,文中基于两种钢筋的锚固长度,设计制备了4组拉拔试验构件,开展预留灌浆孔螺栓锚头连接的预制墩台拉拔试验研究,分析灌浆料、带螺栓锚头钢筋的黏结强度与滑移量之间的关系,建立钢筋拉断破坏时带螺栓锚头钢筋与灌浆料间的黏结-滑移本构模型,考虑实际材料的接触条件来提高有限元模拟的准确性.运用有限元软件ABAQUS,建立预留灌浆孔螺栓锚头连接预制承台有限元模型,研究钢筋直径和预留灌浆孔直径、灌浆料强度等参数影响下预留灌浆孔螺栓锚头连接预制墩台的连接性能.结果表明:预留灌浆孔螺栓锚头连接预制墩台所用灌浆料强度不宜小于80 MPa,预留灌浆孔直径不小于2d.

大型离心压缩机底座及地脚螺栓灌浆程序解析

对于大型离心压缩机组安装、灌浆的要求,各安装规范、厂家说明的描述都存在差别,在理解上有造成混淆之处,本文就从安装原理、灌浆原理和地脚螺栓的工作原理角度,对以往安装和灌浆方式提出改进,以便正确理解规范要求,更好、更快的完成压缩机组的就位、找平、找正、灌浆等工作。

Technology of reinforcement maintenance and blocking against water for large section chamber

The scheme and construction measurement of reinforcement and blocking against water for winder chamber after destroyed by mining influence have been introduced in this paper. The basic principle and advantages of bolting and grouting lining have been also listed. Bolting and grouting lining can increase the integrity and load-carrying capacity of supporting framework and it can assure the stability of supporting framework. It possesses not only the flexible and yielding capacity of bolting and shotcrete lining, but also the effect of rigid support such as metal support and brickwork, forming many kinds of support system, maintaining the stability of roadway together.