HomeMy WebLinkAbout47DIVISION 6
STRUCTURES
6-11 ROOCERIES (NEW SECTION)
6-11.1 (DESCRIPTION)
THE WORK DESCRIBED IN THIS SECTION, REGARDLESS OF THE TYPE OF MATERIALS ENCOUNTERED, INCLUDES THE
EXCAVATION AND SHAPING OF THE CUI OR FILL SLOPES AND FURNISHING AND CONSTRUCTING ROCKERIES/RCCK
RETAINING WALL WHERE SHOWN ON THE PLANS OR WHERE DIRECTED By THE ENGINEER-
6-11.2 MATERIALS
ROCK WALLS SMALL BE FORMED OF LARGER PIECES OF QUARRIED BASALT, ANDESITE OR OTHER IGNEOUS ROCK.
INDIVIDUAL PIECES OF' ROCK SHALL BE SOUND AND RESISTANT TO WEATHERING. WHEN 13ROKEN INTO PIECES
WEIGHING 50 TO 150 GRAKS AND TESTED FOR SOUNDNESS WITH SODIUM SUN-PHATE IN ACCORDANCE WITH AASHTO
T104, THE LOSS THROUGH A ONE -INCH SIEVE AFTER 6 Cyr-1 F SHALL NOT EXCEED 35% BY WEIWT.
THE ROCK MATERIAL SMALL BE AS NEARLY RECTANGULAR AS POSSIBLE SO AS TO AFFORD THE MINIMUM AP40LINT OF
VOID SPACE BETWEEN THE BLOCKS. NO STOW -SHALL BE USED WHICH DOES N01 EXTEND Tl.�ROUGH THE WALL. THE
ROCK MATERIAL SHALL BE HARD, SOUND, DURABLE AND FREE FROM WEATHEFtED PORTIONS, SEAMS, CRACKS AND
OTHER DEFECTS.
THE ROCK DENSITY SHALL BE A MINIMUM OF 160 POUNDS PER CUBIC FOOT. THE SOLRCE OF SUPPLY AND
REFRESENTATIVE SAMPLES OF THE MATERIAL SK41-L BE APPROVED By THE ENGINEER BEFORE DELIVERY To THE
SI TE.
THE ROCK WALLS SMALL BE coNsTRurTFD OF oNE-KAN ROCKS, (85 TO 300 POUNDS) EACH 10' IN ITS LEAST
DIMENSION; TW0-� ROC:KS, (300 TO 600 POUNDS) EACH 13" IN ITS LEAST DIMENSION; THREE-�" ROCKS (800
TO 1,200 POUNDS) EACH 16- IN ITS LEAST DIMENSION; FOUR-KAM ROCKS (1,500 TO 2,200 POUNDS) EACH 18"
IN ITS LEAST DIMENSION. THE pOCKS SHALL RANGE UNIFORMLY IN SIZE FOR EAC�j CLASSIFICATION
SPECIFIES. THE FOUR MAI ROCKS '�� ONLY BE USED FOR THE FIRST COURSE OF ROCK IN WALLS OVER 6 FEET
It HEIGHT.
6-11.3 (CONSTRUCTION REg�!IREMENTS)
THE ROCK UNLOADING AT THE SITE WILL BE DONE IN SUCH A K*"ER AS TO SEGREGATE THE ROCK BY THE SIZE
RANGES INDICATED IN THE PRECEDING PARAGRAPH.
THE WAL'_S SHALL BE STARTED BY EXCAVATING A TRENCH, NOT LESS THAN 6 INCHES OR MORE THAN ONE FOOT IN
DEPTH BELOW SUBGRADE IN EXCAVATION SECTIONS, OR NOT I FS THAN 6 INCHES OR MORE THAN ONE FOOT IN
DEPTH BELOW THE EXISTING GROUND LEVEL IN E41VO04ENT SECTIONS. AREAS ON WHICH THE ROCKERY IS TO BE
PLACED SHALL BE TRIMMED AND DRESSED TO CONFORM To THE ELEVATION OR SLOPE INDICATED. THE ROCK WALL
CONSTRUCTION SHALL START AS SOON AS POSSIBLE UFON THE COMPLETION OF THE CUT OR FIL'_ SECTION.
ROCK SELECTION AND PLACEMENT SHALL BE SUCH THAT THERE WILL BE NO OPEN VOIDS IN THE EXPOSFD FACE OF
THE WALL OVER 6 INCHES ACROSS IN ANY DIRECTION. THE ROCKS SHALL BE PLACED AND KEYED TOGETHER WITH
A MINIMUM OF VOIDS. PARTICULAR ATTENTION SH,%LL BE GIVEN TO THE PLACINC AND KEYING TOGETHER OF THE
FINAL COURSE OF ALL ROCKERIES. THE FINAL COURSE SHALL HAVE A CONTINUOUS APPEARANCE AND BE PLACED
TO MINIMIZE EROSION OF THE ;BACKFILL MATERIAL. THE LARGER ROCKS SHALL BE PLACED AT THE BASE OF THE
ROCKERY 50 THAT THE WALL WILL BE STABLE AND HAVE A STAELE APPEARANCE. THE ROCKS SMALL BE CAREFULLY
PLACED By MECHANICAL EQUIPMENT AND IN A MANNER SUCH THAT THE LOWITUOINAL AXIS IF THE ROCK SHALL BE
AT RIGHT ANGLES OR PERPENDICULAR TO THE ROCKERY FACE. THE ROCKS SMALL HAVE ALL INCLINING FACES
SLOPING TO THE BACK OF THE ROCKERY. EACH ROW OF ROCKS WILL BE SEATED AS TIGHTLY AND EVENLY AS
POSSIBLE ON THE ROCK BELOW IN SUCH A MANNER THAT THERE WILL 13E NG MOVEMENT BETWEEN THE TWO. AFTER
SETTING A COURSE OF ROCK, ALL VOIDS BETWEEN THE ROCKS SHALL BE CHINKED ON THE BA.CK WITH WARRY ROCK
TO ELIMINATE ANY VOID SUFFICIENT TO PASS A 2 INCH SQUARE PROBE.
Supple�ental Specifications
(Re� 05/01/86) Page 25
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