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水下混凝土灌浆导管，是钻孔灌注桩施工中不可缺少的灌浆设备。其联接方式多为法兰盘式或油管接头式。这两种方式虽然联接可靠，密封性好，但都存在着操作中费工费时的缺点，这对提高工效是很不利的。下面介绍一种新的灌浆导管的联接方式。根据这种方式的特点，命名为“杯盖式”。结构见图1。它主要由上、下两个接头和一道“O”型密封圈所组成。上接头上部外表面有4个径向孔；下部焊有3个圆柱状锁紧销；内腔中部有一锥面。下接头上部为一锥形体，其根部有一“O”型密封圈环槽；下部为一圆柱体，其上有3条轴向槽；下端面为一由3个锯齿形所组成的齿状端面。
Underwater concrete grouting pipe is an indispensable grouting equipment in the construction of bored piles. Most of its connection flange or pipe fittings. Although these two methods are reliable and good sealing, they both have the disadvantage of laborious and time-consuming operation, which is very unfavorable to improving work efficiency. The following describes a new way of connecting the grouting catheter. According to the characteristics of this way, named “cup-lid type.” Structure shown in Figure 1. It is mainly composed of upper and lower two joints and an “O” ring. On the upper surface of the connector has four radial holes; the bottom of the three cylindrical welding pin; inner cavity has a conical surface. The upper part of the lower joint is a conical body with a ring groove of “O” type at the root of the lower joint, a cylinder body with three axial grooves on the lower part, a toothed end face formed by three serrations .