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当在松散土壤中挖掘探槽时,重工业企业建设部工程师古刹可夫同志,建议采用金属活动支架来支护探槽。这种支架的主要构件是一种能分开的梯子,它由立柱及螺丝横杆组成(图1)。立柱是由直径38-51公厘,长1．5-3公尺的瓦斯管做成。管的底端做成尖状,以便于快速而可靠的安装。横杆螺丝即由直径28-37公厘的圆钢做成,螺纹为方形。螺杆的一端焊接在立柱上;它端套入焊接在另一立柱上直径38公厘的瓦斯管里。横杆螺丝上套以螺丝帽。将螺帽拧动,即可将梯子撑开。搬动梯子时,可用小链将梯子两半连接起来。
When digging troughs in loose soil, Comrade Kashifu, an engineer at the Ministry of Construction of Heavy Industry Enterprises, proposed to use metallic movable supports to support the trenches. The main component of this bracket is a detachable ladder consisting of an upright and a screw crossbar (Figure 1). The column is made of a gas tube with a diameter of 38-51 mm and a length of 1.5-3 meters. The bottom of the tube is pointed to facilitate quick and reliable installation. The crossbar screws are made of round steel with a diameter of 28-37mm and the threads are square. One end of the screw is welded to the column; the end of the screw is inserted into a 38 mm diameter gas tube welded to the other column. Set the screw cap on the crossbar screw. Twist the nut to open the ladder. When you move the ladder, you can use a small chain to connect the two halves of the ladder.