The Old bases usiljajut, deepen or replace under specially developed project, observing sequence of conducting works and accepting security measures.
The Base bring sites the in length 1.5... 2м. Before underpinning on a wall which will lean against this base, establish beacons for supervision over its possible deformation. Beacons expose also on walls of buildings and the constructions which are in immediate proximity from a place of underpinning. The same actions spend at a bookmark of the new bases closely to the bases of existing buildings. Thus dig foundation ditches and spread the bases sites the in length no more 2м with ruptures to 2... 4м in the sequence established by the project. In a place of an adjunction of the new bases to the existing bases, arrange the sedimentary seam which design is underlined in the project.
Works begin with a marking of walls and their time fastening. At deepening of the bases of a wall strengthen podkosami (fig. 153. After that dig out the base and take out from under it a ground on the first site. Deepening walls strengthen boards with rasporkami. Then on this site podgotovljajut the basis of the new base, stamping its rubble, also deduce a laying closely to a sole of the old base. Thus a sole of an old laying clear of a ground and rubble, and insufficiently strong laying assort. A seam between old and new layings zachekanivajut a rigid cement mortal and shchebenkoj. Having finished podvodku the base on one site, pass to the second, then on the third etc. The base can be brought simultaneously on several sites with ruptures between them on 5... 6м. The recommended sequence of conducting works on sites is shown on (fig. 153,)
a Fig. 153. podvodka the bases :
And - the scheme of time devices on a site of works, - sequence of performance of works;
1 - podkosy, keeping walls, 2 - a foundation ditch protected by boards, 3 - a ladder