绥芬河桩基声测管焊管价格

目前声测管常用的管子有钢管、钢质波纹管、塑料管3种。 　钢管的优点是便于安装，可用电焊焊在钢筋骨架卜，可代替部分钢筋截面，而且由于钢管 刚度较大．埋置后可基本上保持其平行度和平直度，目前许多大直径灌注桩均采用钢作为声测管。但钢管的价格较贵： 　钢质波纹管是一种较好的声测管材料，它具有管壁薄、钢材省和抗渗、耐压、强度高、柔性好等特点，通常用于预应力结构中的后张法预留孔道：用做声测管时。可直接绑扎在钢筋骨架 土，接头处可用大一号波纹套接。

    由于波纹管很轻，因而操作十分方便，但安装时需注意保持其轴线的平直。 　塑料管的声阻抗率较低，用做声测管具有较大的透声率，通常可用于较小的灌注桩，在大型灌注桩中使用时应慎重-因为大直径桩需灌注大量混凝土，水泥的水化热不易发散：鉴于塑料的热膨胀系数与混凝土的相差悬殊，混凝土凝固后塑料管因温度下降而产生径向和纵向收缩，有可能使之与混凝土局部脱开而造成空气或水的夹缝，在声通路上又增加了更多反射强烈的界面，容易造成误判。 　声测管的直径，通常比径向换能器的直径大l0mm即可，常用规格是内径50-60mm。管子的壁厚对透声丰的影响很小，所以，原则上对管壁厚度不作限制，但从节省用钢量的角度而言，管壁只要能承受新浇混凝土的侧压力，则越薄越省。

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Acoustic detection pipe spiral qualitative choose to perforated rate is bigger, easy to install and low cost for the principle. Sound pulse from the transmitting transducer, by coupling water reach the harmony of pipe wall interface, again through the wall to tube wall and concrete interface, through the concrete acoustic detection tube and then through the other two interface in order to receiving transducer. Acoustic detection tube forming four interface, therefore, each interface of sound energy through coefficient can press type calculation:
In: (1) type, sound energy transmission coefficient of the interface; - the acoustic impedance of interface on both sides of the medium rate () between the transmitting and receiving transducer 4 total acoustic coefficient of the interface
(2) the current common steel pipe, steel corrugated pipe, plastic pipe 3 kinds. The advantage of steel pipe is easy to install, can use electric welding welding on the steel skeleton, can replace part of steel, and because the steel pipe stiffness is bigger. After embedment can basically maintain its parallel peace straight degrees, at present a lot of steel large diameter bored piles are used as the acoustic tube. But steel pipe prices more expensive: steel corrugated pipe is a kind of good acoustic detecting tube material, it has a thin wall, steel provinces and permeability, pressure, high strength, good flexibility, often used for the post-tensioned prestressed structure method of the reserved channel: use to be quiet when the tube. Can directly tie in the cage of reinforcement soil, available for a bigger size corrugated socket joint. Because of the corrugated pipe is very light, which is easy to operate, but when installation should pay attention to keep its straight axis. Plastic pipe of acoustic impedance ratio is low, with quiet tube has a larger acoustical transmission rate, usually can be used in small piles, in large piles should be cautious when using - because a large number of concrete need infusion of large diameter piles, the cement hydration heat is not easy to spread, in view of the difference of plastic and thermal expansion coefficient of concrete, concrete plastic pipe after the radial and longitudinal contraction due to temperature drop, likely to that of the local release of concrete cracks caused by air or water, again on the acoustic channel added more reflect a strong interface, easy to cause miscarriage. The diameter of the tube, usually l0mm can be larger than the diameter of the radial transducer, inner diameter is commonly used specifications 50 to 60 mm. Pipe wall thickness on the influence of the perforated feng is very small, so, in principle, to the wall thickness is not restricted, but from the viewpoint of saving quantity of steel, pipe wall as long as you can bear the lateral pressure of new pouring concrete, the thinner the province.