Retaining walls; their design and construction . e the concrete pour is started. To aidin the stripping of the form, the inside face of the form is usuallyoiled, with a heavy oil, termed a form oil, which is a heavysludge. Although this stains the concrete face, the rubbingand washing of the concrete surface easily removes the oil marks. Patent —For a wall of large yardage and of fairlyconstant outline, permitting many reuses of the form panel, theuse of some of the patent forms may show quite an economy,both in the construction of the form and in the labor of settingup and stripping th
Retaining walls; their design and construction . e the concrete pour is started. To aidin the stripping of the form, the inside face of the form is usuallyoiled, with a heavy oil, termed a form oil, which is a heavysludge. Although this stains the concrete face, the rubbingand washing of the concrete surface easily removes the oil marks. Patent —For a wall of large yardage and of fairlyconstant outline, permitting many reuses of the form panel, theuse of some of the patent forms may show quite an economy,both in the construction of the form and in the labor of settingup and stripping the forms. The two best known types of such forms are the HydraulicPressed Steel Form and the Blaw Form. 1 An excellent rod puller is sold by the Universal Clamp Co. of Chicago. 190 RETAINING WALLS The Hydraulic Pressed Steel Form consists of two parts: thebracing and the form panel. The bracing is formed of uprightUs spliced as necessarj- and held together by tie rods and spacersor Hners. Fig. 115 shows a sketch of the bracing and its Fig. 115.— Hydraulic Pressed Steel Co. form assembly of liners and plates. The form panel consists of a sheet metal (all metal used in theseforms both panel and uprights are no. 11 gage, , one-eighth inchmetal) backed bj 2 boards. Around the periphery of the panela U steel edge is put, to which the boards are screwed (see ). The panels are held in place against the uprights bymeans of stout Us spaced about one foot apart (see Fig. 115). .?Standard Upright Standard-nail Plate rfedqe. \y^^h Standard Yfc StandardWall PlateWall Plate Clamp. Fig. 116.—Section of Hydraulic Pressed Steel Co. form. It is claimed by the company that the panels may be reusedabout 300 times before wearing out. Where a job will permit areuse of the form panel exceeding twenty or thirty times, theymaintain that their form will prove cheaper than the wood formordinarily built. Plate IV -
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