HomeMy WebLinkAboutWWP2703444.1PROJECTED PLATE AREA 414 Safi
MAXIMUM PROCESS FLOW 415 GPM
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No. OW-CPS-9
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SECTION M
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NF if TI.71 t1FFr:FC
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D��cled EI '.Vashlxllm :tits Dercrlrr=--I-
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rc Pipes
-ill Yd .h :.leaI ;rater P lu o S.ar= .,3' G ,-=n
FI OW FFFI ,IT CLI IFCTFn
`lenf'. .41 Cr_o:.•:o t Sizes ccnd _oci7-ton€
Rz-F 420A T'r S. F
I1C G'H 1- 60 NiruI
OIL -WATER
SEPERATOR DETAIL
CONCRETE BLOCKING SIZING PROCEDURE
A. GENERAL
The amount of concrete required to anchor horizontal
bends, tees, and dead ends depends on the strength
of the soil. The methods of placing concrete to keep
the joint accessible is shown in Figure 1. The area
in square feet of concrete which must bear against
the side of the trench is found by dividing the
thrust in pounds shown in Table 1 by the safe
bearing load of the soil as shown in Table 2.
B. CRITERIA
1. The sizing procedure is for horizontal or
downward thrust only.
2. Height of the thrust block must be equal
to or less than 1/2 the depth from the ground
surface to the block base.
3. The thrust block bearing face is approximately
rectangular.
4. The concrete blocking shall be as per APWA
Specification 74-2.14.
C. SYMBOLS
d = Outside Diameter of Pipe in Feet
T = Thrust in Pounds at the Fitting (Table 1)
SBL = Safe Bearing Load in Pounds/Sq. Ft. (Table 2)
h = Depth of Trench in Feet
W = Width of Trench in Feet
A = Area of Concrete which must bear against the
Side of the Trench in Sq. Ft.
Hm = Maximum Height of the Thrust Block in feet
Dc = Depth of the Concrete Thrust Block
to Bearing Surface in Feet
Lm = Maximum Length of the Thrust Block in Feet
GROUND SUFACE
1 --
h
Hm` 2
(BLOCK BASE
C.
W
D. CALCULATION EQUATIONS
M11-
•ns
` r •'' 41
L -C. -i 0-r
1. Problem:
Calculation of the amount ofconcrete required to block
a 90' bend in an 8"
C.I. water main; the normal operating pressure in the pipe will be 65 psi
and the soil condition in the area indicates sand and gravel.
2. Solution:
- Maximum testing pressure (See Table 1) = 300 psi.
= 0.75 ft.
- Outside diameter of 8 pipe = 9.05 in. = 9.05/12
- Go to Table 1: The testing pressure of 300 psi, we
see
that the thrust on a 90` bend is 21,360 pounds.
- Go to Table 2: Table 2 gives the safe bearing load
for
sand and gravel: 3,000 lbs./sq. ft.
- Go to Figure 1: figure 1 indicates the position
of the concrete for blocking the 90' bend.
- Go to the specifications of the project and find
depth of trench h = 4 feet
- Width of trench W = 3 feet
With the above assembled information,
we proceed to the final calculations:
Thrust
- Area of Concrete (A) =
360
- 7.12 sq ft.
Safe Bearing Load
3,�000
- Depth of
Maximum Height of Thrust Block (Hm) =
Trench in Feet
2
h 4
= =
= 2.0 ft.
2 2
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
-M L th fTh tBl k(L )-
Area of Concrete
aximum eng o rus oc m -
Required Amount of Concrete
Thrust (In Pounds
1. Area of Concrete (A) = _ T
Safe Bearing Load (In Pounds/Sq. Ft.) SBL
2. Maximum Height of Thrust Block (Hm) = Depth of Trench in Feet _ h
2 2
3. Depth of Concrete Thrust Block =
4.
Maximum
Length
of
Thrust Block (Lm) _
5.
Required
Amount
of
Concrete (Cu. Yd.)
Width of Trench in Feet) -
Outside Diameter of Pipe in Feet) W-d
2 2
Area of Concrete _ A
Maximum Height Hm
= (Height x Depth x Length) x 0.03704
= (Hm x Lm x Dc) x 0.03704
Height of Concrete
_ A _ 7.12
Hm 2.0 = 3.56 ft.
= (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'
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
18"
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
141,370
199,960
108,150
55,140
28,280
36"
200
203,580
287,950
155,740
79,400
40,720
C,
- INLET PIPE
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RAISE-1 /2"
WIDE BORDER
5/8"
2-7/8" 4„
FIBER JOINT
PACKING
45' (1 /8) BEND
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PIPE MATERIAL AS SPECIFIED 0�00
BY THE ENGINEER
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LANDSCAPE 14" PARKING
BEDS LOT
12„ 2„
1/2" R. 1" R.
4
FACE
OF
CURB. y
CAST IRON RING AND COVER _ CROSSWA
NOTE: N
IN UNIMPROVED AREAS POUR 1 -0 THICK
2'-0" SQUARE CONCRETE, CLASS 3000, PAD AROUND
`n
RING AND COVER. I" ��. �-_• `- T
IN ASPHALT ROADWAYS RESTORE AROUND CLEANOUT RING PLUG TO BE SEALED
AND COVER AS REQUIRED BY STANDARD DETAIL DRAWING BR36. IN SAME MANNER AS
MAIN SEWER JOINTS.
STANDARD SANITARY CLEANOUT /
CONCRETE
CLASS 3000
2'-0„
3/4" SQUARES SPACED - 3/4"
AS INDICATED - HT. 1 /8" 1'-0"
�1/2„I--4-3/4„
n r 12„0
10"
9„
8-3 4"
1/2" 2"
7"
7-3/4"
TOP
OF
A/C
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1
TABLE 2
Safe Bearina Loads in Lb./Sq. Ft. 9 1/2-
The safe bearing loads given in the following table are for
horizontal thrusts when the depth of cover over the pipe s „
exceeds 2 feet. 12 CURB DETAIL
Safe Bearing Load
SOIL Lb. per Sq. Ft.
*Muck, peat, etc. 0 CLASS "B" A.C. PAVEMENT 40" Min. SAWCUT (TYP)
Soft Clay 1,000 1 1' MATCH EXISTING
Sand 2,000 MATCH EXISTING PAVEMENT-, PAVEMENT
Sand and Gravel 3,000
Sand and Gravel Cemented with Clay 4,000 /
Hard Shale 10,000 /.�//�/,�/
c�J°°0o°°o�°,o0°D�°°�
*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
stability to resist thrusts.
WSDOT STANDARD
• SPECIFICATION CRUSHED
WSDOT STANDARD SURFACING BASECOURSE.
SPECIFICATION CRUSHED
%.:., SURFACING - TOP COURSE
& KEYSTONE. LANDSCAPE 7 1/2- PARKING
TYPE "D" backfill. BEDS LOT
CAP 5 1/2" 2"
0
22-1 /2 1/2" R. 1" R.
FACE
OF
PRECOVER CURB
BEDDING -
".. 1, TOP
-- x� Pipe 1 - 0 0
- D i a . b A/C
%r 2 + 1. D.
TRENCH N
FOR 8" PIPE (TYP)
O
45 BEND `1
TEE A. THICKNESS OF A.C. PAVEMENT AND CRUSHED ROCK
TO BE IN CONFORMANCE WITH THE CITY OF
RENTON OR WSDOT UTILITY PERMIT. g 1/2"
FIGURE 1
NOTE: FOR CONVEX VERTICAL BENDS BLOCKING SEE
APWA STANDARD PLAN NO. 73.
FOR THE CITY OF RENTON PROCEDURE FOR CONCRETE
BLOCKING SIZING
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
Slw344'401
/ I \ SHEET RECONFIGURED
STANDARD CURB DETAIL
RECOMMENDED FOR APPROVAL
BY-
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CONCRETE BLOCKING PROCEDURE