Ladder marches and platforms mount in process of erection of walls of a building. An intermediate platform and the first march establish on a course of a laying of internal walls of the staircase, the second (floor) platform and the second march - upon termination of a floor laying.
Prior to the beginning of installation of ladder platforms and marches check their sizes. Then mark installation sites, put on a platform opiranija a layer of a solution and establish a ladder platform. At once after platform adjustment mount the next march. It allows to adjust mutual position of a march and a platform to shvatyvanija a solution.
Position of a ladder platform verify on a vertical and in the plan. If the mark of top of a platform appears above design accordingly it is necessary then to raise a mark of a covering of a floor, and it will demand additional expenses of work and materials. To adjustment of position of ladder platforms (fig. 135) in the plan apply a template 3, copying profile of a basic part of a march.
a Fig. 135. Adjustment of position of ladder platforms :
1 - overlapping plates, 2 - an intermediate platform, 3 - a template, 4 - a floor platform
The Ladder march submit the crane with the help vilochnogo capture and chetyrehvetvevogo a sling with two truncated branches (fig. 136) which at lifting give to a march an inclination a bit more than the design. At installation of its ladder march at first opirajut on the bottom platform, and then on the top. If to make on the contrary, the march can break from the top platform.
Before installation of a march assemblers suit on basic places of ladder platforms bed from a solution, throwing and levelling it kelmami.
At installation of marches one assembler is on the bottom platform, another - on overlying overlapping or on podmostjah near to a staircase, the first accepts a march and directs it to a staircase, moving simultaneously to the top platform. At height 300... 400мм from a place of landing of a march both assemblers drive him into the corner, give to the machinist of the crane a signal and establish into place at first the bottom end of a march, then top. Discrepancies of installation correct lomikami then unhook a sling, zamonolichivajut joints between a march and platforms a cement mortal and establish inventory protections. The sequence of operations is shown on fig. 136.
a Fig. 136. Sequence of installation of a ladder march :
And - stropovka vilochnym capture, - lifting, in - acceptance and lowering, g - installation in design position