Tax 2012A-SP130404 - TRENCH SAFETY PLAN
UTILITY LINES
MOCKINGBIRD LANE RECONSTRUCTION
(IN AND AROUND MOCKINGBIRD LN FROM EAST BETHEL SCHOOL RD TO ORIOLE LN)
COPPELL, TEXAS
FOR
THE CITY OF COPPELL,TEXAS
Note: Soil information indicates that a stiff clay(Type"B"soil)will be found on the project
site. The following applies:
H =3/4 in stiff clay(Type"B" soil or better).
H = 1 or greater in Type"C"soil
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Trench Safety Plan for:RRM UTILITY SERVICES Pg:l of:5
Mockingbird Lane Reconstruction Job No:6344 Richard Haider P.E.
Date :04 Apr 2013 Trench Safety Engineering
(Fm:Bethel School to Oriole) Scale :As shown 833 Rachelle
Caplrall,Texas Design:R.H. Red edO9�9775 Texas 75154
GENERAL NOTES
1. For all excavations of trenches,which will exceed a depth of five feet,the Contractors
trench safety procedures shall meet the current standards established by OSHA on
excavations, trenching, shoring, and confined spaces, all of which are incorporated
herein by reference.
2. If details shown are not feasible due to unanticipated conditions, the Contractor shall
notify the Trench Safety Engineer for re-evaluation.
3. These drawings assume all excavated areas remain free of water seepage or intrusion.
Excavations shall be inspected after every storm or other hazard-increasing occurrence
to assure the continued safety of the trench. The Contractor shall seek guidance from
the Trench Safety Engineer where needed.
4. When installing a support system, shoring will be applied by starting at the top of the
trench excavation and working downward. All cross beams, trench jacks, etc., will be
placed in a true horizontal position. Support system removal shall begin at the bottom
and proceed upward, performed from outside the trench.
5. Materials used for sheeting, sheet piling, bracing, shoring, etc., shall be in good
serviceable condition. Timbers used shall be sound and free from large or loose knots
and shall be designed and installed so to be effective to the bottom of the excavation.
6. Alternate design for use of steeper slopes of the use of supporting systems, i.e., piling,
cribbing, shoring, etc., may be submitted by the Contractor for evaluation by the Trench
Safety Engineer.
7. Slopes shown shall be the maximum unless changed by the Trench Safety Engineer
due to changing soil conditions. Slopes"shown are for a short-term period. If
excavations are open for more than 24 hours, the Trench Safety Engineer shall be
contacted for evaluation.
8. Cohesive soils are classified by their unconfined compressive strength, as follows:
(psf= pounds per square foot; tons/sq ft= tons per square foot)
Type"A"...more than 3,000 psf(1.5 tons/sq ft)
Type"B"...more than 1,000 psf(0.5 tons/sq ft)and less than 3,000 psf(1.5 tons/sq ft)
Type"C"...less than 1,000 psf(0.5 tons/sq ft)that is not flowing or submerged.
Trench Safety Plan for:RKM UTILITY SERVICES Pg:2 of:5
Td
Job No:63 Richard Haider P.E.
Mockingbird Lane Reconstruction Date :63 Apr 2413.Trench Safety Engineering
(Fm:Bethel School to Oriole) 833 Rochelle
Coppell,Texas Scale :As shown Red Oak.Texas 15154
Design:R.H. 1.800900.9775
Note: Either benched or sloped is acceptable
r 2' min 10'max.
x
Spoil
t
H
.1 max. •
t
As Required
TYPICAL OPEN CUT CROSS SECTION
N.T.S.
Trench Safety Plan for:RKM UTILITY SERVICES Pg:3 of.5
Job No:63U Richard Haider P.E.
Mockingbird Lane Reconstruction Date :0#Apr 2013 Trench Safety Engineering
(Fm:Bethel School to 0'14)10 1333 Michelle
S
Cappell.Texas
Scale :As shown Red Oak,Texas 75154
Design:R.H. 1800300.8775
Spaced 6'to V o.c.in unweathered limestone.
Spaced 4'o.c.in stiff clay(Type"13"soil)and weathered limestone.
Spaced 4'o.c.,in thy Type"C"soil sheeted with 3/4",14-ply Finland
Birch,or 1-18"CDX plywood,or approved equal.
Standard'hydraulic shoring
14'min. 6' max.
Spoil
: :Asper manufacturer's
data and limitations
2'max.f
M
As Required
The aluminum hydraulic shoring listed below are just three
examples of trade names of Standard'hydraulic shoring which
are acceptable.The examples are with a width maximun of 55"
Speed Shore Hydraulic Shores, model No.V-7-55 or V-5-55,
or V-3.5-55,or equal. Shores may be stacked.
GUE Vertical Shores,model No.HVS-73455 or HVS-5-3455,
or HVS3.53455,or equal.Shores may be stacked.
EFFICIENCY PRODUCTION,models No.7X3455-S or 5X3455-S,
or 3.5X3455-S,or equal. Shores may be stacked.
Alsoavallable are Speed Shore'Heavy Duty'shores,which rails run in the 8',12', and 16'range.
If sheeting Is desired,3/4",14-ply Finland Birch,or 1-18"CDX plywood
or equal,is acceptable.
ALTERNATE HYDRAULIC SHORING CROSS SECTION
N.T.S.
Trench Safety Plan for:RKM UTILITY SERVICES Pg:4 of:5
Job No:6344 Richard Haider P.E.
Mockingbird Lane Reconstruction Date :43 Apr 2013 Trench Safety Engineering
(Fm:Bethel School to Oriole) Scale -As shown 833 Rachelle
Coppell,Texas Design:R.H. Red 5�.9775 75154
I. 2'min.i 18'max
Spoil
H
• d,max
As Required
CROSS-SECI10PI
N.T.S.
Trench Boxishield side wall capacity shall be equal or greater than 360 psf
for Type"B"soil and equal or greater than 500 psf for Type"C"soil.If there
are any changes In soil conditions,the Trench Safety Engineer shall be
contacted for evaluation.
Any manufacturedlrated trench shield system,such as Manhole Rings,Modular
Shields,Panel Shields,etc.are included in this category.
Trench box capacity refers to sidewall capacity of bottom box when boxes are
stacked.If contractor requires "closed ends"for trench box,one acceptable
method Is by placing 3M",or greater(or equal substitute)steel plate (width
size may varry)against spreaders of trench box.Other methods may be used
with the approval of Trench Safety Engineer.
ALTERNATE TRENCH BOX CROSS SECTION
N.T.S.
Trench Safety Plan for:RKM UTILITY SERVICES Pg:5 of:5
I�lockin bird Lane Recons action Job No:63 Richard Haider P.E.
g Date :04 Apr 2013 Trench Safety Engineering
(Fm:Bethel School to Oriole) 833 Rachelle
Coppell.Texas Scale :As shown Red Oak.Texas 15154
Design:R.H. 1.800980-9775