测定施工条件下混凝土的强度可采用特制手枪。其构造如图1所示。强度,用手枪测定方法如下:拉动枪栓时,导向主杆压紧弹簧,起动销卡入导向主杆的环形槽口中;按下扳机时,导向主杆在弹簧作用下沿枪筒移动到原来位置,使锥形撞针撞击混凝土表面,形成一定直径的孔窝;根 The strength of concrete under construction conditions can be measured using special pistols. Its structure is shown in Figure 1. Strength, pistol determination method is as follows: Pull the bolt, the guide rod presses the spring, the starting pin snaps into the ring slot guiding the main rod; when the trigger is pressed, the guiding rod moves along the barrel under the action of the spring In the position, the cone-shaped striker hits the concrete surface to form a hole of a certain diameter;