| 摘要 |
The present invention relates to a length changing device of a steel form for constructing an underground road side wall, which is to easily construct a side wall of an underground road without damage to a steel form even in construction of a whole section. The length changing device of a steel form comprises: a base having a fixing installation unit on the front surface; a side plate unit individually arranged on both sides of the front surface of the base to be individually located on both sides of the fixing installation unit, wherein the side plate unit has protrusion units having multiple first installation holes on the inner side in order for the protrusion units to face each other; an opening and closing cover installed to rotate by being connected to the upper part of the base by a hinge around a hinge shaft, wherein the opening and closing cover closes an upper space formed between the side plate units by being attached to the upper surface of the side plate unit; and a length changing unit connected between the side plate units to slide by individually having a mounting groove facing the protrusion unit on both sides, wherein the length changing unit has a variable lifting unit vertically lifted by the operation of a variable handle. |
