【摘要】 PVC塑料声测管由于管材的热膨胀系数与混凝土相差悬殊,故在混凝土凝固后容易出现局部脱开而形成空气夹缝,使声波在空气中传播能量快速衰减,造成该处信号误判。部分桩通过桩头蓄水浸泡,水渗透后会排开夹缝中的空气,使得桩、管耦合良好,得到满意的测试效果,但部分桩采用该法也无法获得满意的声波信号,据此进行判据则会导致误判。更多还原

【Abstract】 PVC plastic acoustic detecting pipe which thermal expansion coefficient is quite variable with concrete is partial disengaged and it is easy to cause the air cracks after concrete is concretionary,so the transmitted energy of sound wave decays fleetly in the air,and it causes signal misjudged.Part of the pile can be pushed aside the air between the interstice with water infiltration through water storage and immersion of pile head,making the pile and pipe be in good coupling,it is lead to satisfactory test results,but it can not get a satisfactory acoustic signal in some pile with this method,hereby the criterion will cause misdiagnosis.更多还原