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顶板树脂锚杆的检测装置 美国目前年锚杆用量已达1亿根左右,其中约有2千万根是粘结式全长或端部树脂锚固。 对于一般膨胀锚固的锚杆,可用力矩和拉力二种方式检测,采用力矩检测较为普遍。安全规程要求力矩检测时施加667.2牛顿力(150英尺一磅)时,被测锚杆转动不得超过1/4圈。对粘结式锚杆,旋转不仅破坏粘结,还会丧失锚固能力,所以力矩检测不宜用于粘结式锚杆。拉力检测时测出的数据是钢材强度,当部分树脂锚杆在岩石中较好的粘结时,抗拉力会超过钢锚杆的强度,所以不能反映锚固的实际情况。 测定树脂粘结式锚杆要有一种不破坏结构并且反映真实粘结状态的装置。这种装置用在全长和端部树脂锚固锚杆上会出现差别,在全长树脂锚杆上
Roof resin bolt detection device The United States now has an annual amount of anchor about 100000000, of which about 20 million is the bond length or end of the resin anchorage. For the general expansion of the anchor bolt can be torque and pull the two ways to detect the use of torque detection is more common. Safety regulations require that the tested bolt be rotated no more than 1/4 turn when applied with 667.2 Newtons (150 ft-lb) during torque testing. For bonded anchor, the rotation not only destroy the bond, but also lose the anchoring ability, so the torque detection should not be used for the bond anchor. The data measured during tension testing is the strength of the steel. When part of the resin bolt is better bonded in the rock, the tensile strength will exceed the strength of the steel bolt, so the actual situation of the anchorage can not be reflected. Determination of resin-bonded anchor to have a do not destroy the structure and reflect the true bonding state of the device. This device used in the full-length and the end of the resin anchoring bolt will be different, the full-length resin bolt