HomeMy WebLinkAboutS-344401PROJECTED PLATE AREA 444 80 MAMAUM PROCESS FLOW ® 4:15 GPM
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OIL -WATER
SEPERATOR DETAIL
CONCRETE BLOCKING SIZING PROCEDURE
E. EXAMPLE
A. GENERAL
45-
22-1/2"
1. Problem:
The amount of concrete required to anchor horizontal
Calculation of the amount ofconcrete required to block a 90- bend in an 8"
bends, tees, and dead ends depends on the strength
Maximum
of the soil. The methods of placing concrete to keep
C.I. water main; the normal operating pressure in the pipe will be 65 psi
the joint accessible is shown in Figure 1. The area
and the soil condition in the area indicates sand and gravel.
in square feet of concrete which must bear against
2. Solution:
the side of the trench is found by dividing the
.Thrust
thrust in pounds shown in Table 1 by the safe
bearing
bearing Load of the soil as shown in Table 2.
- Maximum testing pressure (See Table 1) = 300 Psi- 0.75 ft.
B. CRITERIA
- Outside diameter of 8 pipe = 9.05 in. = 9.05/12
3,780
- Go to Table 1: The testing pressure of 300 psi, we see
1. The sizing procedure is for horizontal or
that the thrust on a 90° bend is 21,360 pounds.
downward thrust only.
- Go to Table 2: Table 2 gives the safe bearing load for
2. Height of the thrust block must be equal
sand and gravel: 3,000 lbs. /sq. ft.
to or less than 1/2 the depth from the ground
- Go to Figure 1: figure 1 indicates the position
surface to the block base.
of the concrete for blocking the 90° bend.
3. The thrust block bearing face is approximately
- Go to the specifications of the project and find
rectangular.
depth of trench (h) 4 feet
4. The concrete blocking shall be as per APWA
- Width of trench W) = 3 feet
Specification 74 -2.14.
2
C. SYMBOLS
With the above assembled information,
30,570
we proceed to the final calculations:
d = Outside Diameter of Pipe in Feet
T = Thrust in Pounds at the Fitting
g ( Table )
Thrust _ 21,360
Area of Concrete (A) _ - = 7.12 sq ft.
Safe Bearing Load 3,000
SBL = Safe Bearing Load in Pounds /Sq. Ft. (Table 2)
4.
h = Depth of Trench in Feet
- Maximum Height of Thrust Block (Hm) _ Depth of Trench in Feet
W = Width of Trench in Feet
2
A = Area of Concrete which must bear against the
h 4
Side of the Trench in Sq. Ft.
= 2 = 2 = 2.0 ft.
Hm = Maximum Hai ht of the Thrust Block in feet
Maximum Height
Dc = Depth of the Concrete Thrust Block
to Bearing Surface in Feet
Lm = Maximum Length of the Thrust Block in Feet
GROUND SUFACE
h `'� d
Hm` 2 +
BLOCK BASE DC
r°- W
D. CALCULATION EQUATIONS
Depth of Concrete Thrust Block (Dc)
Width of Trench in Feet (W) - Outside Diameter of Pipe (d)
2
3 - 0.75 = 1.13 ft.
2
- Maximum Length of Thrust Block (Lm) = Area of Concrete
- Required Amount of Concrete
1.
Area of Concrete
(A) = Thrust (in Pounds =
T
90-
45-
22-1/2"
Safe Bearing
Load (In Pounds /Sq. Ft.)
SBL
2.
Maximum
Height
of Block (Hm) -
Depth of Trench in Feet
h-
=
• 300
2,120
3,000
.Thrust
2
Z
4"
300
3,780
5,370
Width of Trench in Feet) -
1,470
750
6"
300
8,500
Outside Diameter of Pipe in Feet) W -d
3.
Depth of
Concrete
Thrust Block =
300
_
-
2
21,360
11,550
5,880
3,020
2
275
21,620
30,570
16,540
8,430
Area of Concrete
A
4.
Maximum
Length
of Thrust Block (Lm) _
_
6,780
14"
250
46,200
65,370
Maximum Height
Hm
5.
Required
Amount
of Concrete (Cu. Yd.)
_ (Height x Depth x Length) x
0.03704
17,650
9,050
W11
200
_ (Hm x Lm x Dc) x 0.03704
72,000
Height of Concrete
A _ 7.12 = 3.56 ft.
Hm 2.0
= (Height x Depth x Length) x 0.03704
= (Hm x Lm x Dc) x 0.03704
= (2.0 x 3.56 x 1.13) x 0.03704
= 0.30 cu. yd.
TABLE 1
Size
Pressure
PSI
Thrust at Fittings in Pounds
Tees
90-
45-
22-1/2"
11-1/4"'
=
0
_
Dead Ends
Bend
Bend
Bend
Bend
3"
• 300
2,120
3,000
1,630
830
430
4"
300
3,780
5,370
2,910
1,470
750
6"
300
8,500
12,000
6,510
3,320
1,700
8"
300
15,100
21,360
11,550
5,880
3,020
10"
275
21,620
30,570
16,540
8,430
4,330
12"
250
33,930
48,000
25,950
13,260
6,780
14"
250
46,200
65,370
35,340
18,030
9,240
16"
225
45,250
64,000
34,620
17,650
9,050
W11
200
50,900
72,000
38,940
19,860
10,180
20"
200
62,840
88,900
48,080
24,520
12,560
24"
200
90,480
127,980
69, 200
35,320
18,100
30"
200
141s370
199,960
108,150
55,140
28s280
36"
200
203,580
287, 950
155,740
79,400
40s720
CONCRETE BLOCKING PROCEDURE
1 -1/
i n"
' SQUARES SPACED - 3/4"
NDICATED - HT. 1/8"
1 /2f
RAISE-1/2"
WIDE BORDER
CAST IRON RING AND COVER
NOTE:
IN UNIMPROVED AREAS POUR 1' -0" THICK
2' -0" SQUARE CONCRETE, CLASS 3000, PAD AROUND
RING AND COVER.
IN ASPHALT ROADWAYS RESTORE AROUND CLEANOUT RING
AND COVER AS REQUIRED BY STANDARD DETAIL DRAWING BR36.
PIPE MATERIAL AS SPECIFIED
BY THE ENGINEER
1f_Oif Ft.
12 "b �
FIBER JOINT
PACKING
45- (1/8) BEND
STANDARD SANITARY CLEANOUT
TABLE 2
Safe Bearing Loads in Lb. /Sq. Ft.
The safe bearing loads given in the following table are for
horizontal thrusts when the depth. of cover over the pipe
exceeds 2 feet.
Safe Bearing Load
SOIL Lb. per Sq. Ft.
*Muck, peat, etc. 0 CLASS "B" A.C. PAVEMENT
Soft Clay 1,000
Sand 2,000 MATCH EXISTING PAVEMENT
Sand and Gravel 3,000
Sand and Gravel Cemented with Clay 4,000
Hard Shale 10,000
*In muck or peat, all thrusts shall be restrained by piles or
tie rods to solid foundations or by removal of muck
or peat and replacement with ballast of sufficient a 4 °
CONCRETE
o
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CLASS 3000
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WSDOT STANDARD
SPECIFICATION CRUSHED
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LANDSCAPE 14" PARKING
BEDS LOT
12" 2"
1/2- R. /- 1" R.
FACE
OF
CURB
CROSSWALK o a
a N 1
a a
TOP
N ° OF
a A/C
4 Q 4 /
a
rLU� TO BE SEALED
IN SAME MANNER AS
MAIN SEWER JOINTS.
a
a a
a
a
9 1/2-
0 12" CURB DETAIL
40" Min. SAWCUT (TYP)
1 1' MATCH EXISTING
PAVEMENT
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a °4 a
stability to resist thrusts. a
Y •
CAP
22 -1/2 0
TEE
11 -1/4�
45 BEND
90 BEND
NOTE: FOR CONVEX VERTICAL BENDS BLOCKING SEE
APWA STANDARD PLAN NO. 73.
FOR THE CITY OF RENTON PROCEDURE FOR CONCRETE
BLOCKING SIZING
WSDOT STANDARD
SPECIFICATION CRUSHED
SURFACING BASECOURSE.
LANDSCAPE 7 1/2- PARKING
TYPE "D" backfill. BEDS LOT
A. THICKNESS OF A.C. PAVEMENT AND CRUSHED ROCK
TO BE IN CONFORMANCE WITH THE CITY OF
RENTON OR WSDOT UTILITY PERMIT.
B. CONTROLLED DENSITY FILL MAY BE REQUIRED BY
THE CITY OF RENTON.
C. ALL JOINTS TO BE TACKED, SEALED AND SANDED.
D. A.C. LIFTS SHALL BE A MINIMUM OF 0.15' AND A
MAXIMUM OF 0.35.
E. ALL GRANULAR MATERIALS TO BE COMPACTED TO
95% OF MAXIMUM DENSITY (T -99 METHOD).
F. SEE APPROVED PLANS AND STANDARD DRAWINGS
FOR PIPE ZONE AND BACKFILL REQUIREMENTS.
PAVEMENT RESTORATION
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5 1 /2 2
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FACE
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CURB
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TRENCH
FOR 8" PIPE (TYP)
WSDOT STANDARD
SPECIFICATION CRUSHED
SURFACING BASECOURSE.
LANDSCAPE 7 1/2- PARKING
TYPE "D" backfill. BEDS LOT
A. THICKNESS OF A.C. PAVEMENT AND CRUSHED ROCK
TO BE IN CONFORMANCE WITH THE CITY OF
RENTON OR WSDOT UTILITY PERMIT.
B. CONTROLLED DENSITY FILL MAY BE REQUIRED BY
THE CITY OF RENTON.
C. ALL JOINTS TO BE TACKED, SEALED AND SANDED.
D. A.C. LIFTS SHALL BE A MINIMUM OF 0.15' AND A
MAXIMUM OF 0.35.
E. ALL GRANULAR MATERIALS TO BE COMPACTED TO
95% OF MAXIMUM DENSITY (T -99 METHOD).
F. SEE APPROVED PLANS AND STANDARD DRAWINGS
FOR PIPE ZONE AND BACKFILL REQUIREMENTS.
PAVEMENT RESTORATION
In
t
q4W)
/,\SHEET RECONFIGURED
5 1 /2 2
1/2- R. 1" R.
FACE
OF
CURB
N
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SHEET NO.
4A,
PACE PROJECT NUMBER 07892
DWG EIRE: P07892 -DS -2
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PACE PROJECT NUMBER 07892
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