FIELD: mining. SUBSTANCE: shaft beam is made in form of plate with chamber formed by grooves arranged from the side of working reinforcement. The grooves adjoin to the ribs of longitudinal sides and are directed across the longitudinal axis of beams. Grooves may be arranged symmetrically and in parallel to each other. Their length is not more than 0.3 of the width of beam. Their depth doesn't exceed the value of protective layer of concrete of working reinforcement. EFFECT: enhanced efficiency of shaft beam. 2 cl, 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| MINE TIGHTENING MEMBER | 0 |
|
SU611017A1 |
| PANEL-TYPE METAL SUPPORT | 1992 |
|
RU2039288C1 |
| SHAFT LAGGING FOR FRAME SUPPORTS MADE OF SPECIAL PROFILE | 2006 |
|
RU2312220C1 |
| BRACE FOR FRAME-TYPE ROOF SUPPORTS | 0 |
|
SU877043A1 |
| MINE LAGGING | 0 |
|
SU1710766A1 |
| MINE CONCRETE TIE-BAR FOR FRAME SUPPORTS OF SPECIAL PROFILE | 2003 |
|
RU2246623C1 |
| MINE LAGGING FOR FRAME SUPPORT | 1991 |
|
RU2023883C1 |
| MINE BRAKE FOR MINE WORKINGS | 0 |
|
SU723117A1 |
| STRUCTURE OF STRENGTHENING OF REINFORCED CONCRETE HOLLOW-CORE SLABS | 2015 |
|
RU2610951C1 |
| REINFORCEMENT STRUCTURE OF STRETCHED ZONE OF HOLLOW-CORE SLAB | 2015 |
|
RU2590494C1 |
