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Home My WebLink AboutWTR2703029.2N O O O N o YI IZ � TSZ rn 9 3O O L a U v= AM Z� 0 .r 3: ✓ Z� M 0� �2 cu w .. Q = J LLI z a F- U cc�3 0 O Z0 z o U Z O Q a Z w w Q N N J ?j a- � U 0 oZ � oN o { w Z � 3 v 0 � &r5 m m m Q w 0 CONCRETE BLOCKING SIZING PROCEDURE - 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. A. GENERAL - Go to the specifications of the project and find depth of trench (h) = 4 feet The amount of concrete required to anchor horizontal bends, tees, and dead ends depends on the strength of the soil. The methods of placing -Width of trench (W) = 3 feet concrete to keep the joint accessible is shown in Figure 1. The area in With the above assembled information, we proceed to the final calculations: 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 - Area of Concrete (A) = Thrust - 21,360 = 7.12 sq ft. 3,000 Be aring earing Load bearing load of the soil as shown in Table 2. SafeDepth of Trench in Feet - Maximum Height of Thrust Block (Hm) = 2 B. CRITERIA = h = 4 = 2.0 ft. C A P 1. The sizing procedure is for horizontal or downward thrust only. 2 2 2. Height of the thrust block must be equal to or less than 1 /2 the depth -Depth of Concrete Thrust Block (Dc) from the ground surface to the block base. =width of Trench in Feet (W) -Outside Diameter of Pipe (d) - 3 - 0.75 = 1.13 ft. 3. The thrust block bearing face is approximately rectangular. 2 2 4. The concrete blocking shall be as per APWA Specification 74-2.14. -Maximum Length of Thrust Block (Lm) = Area of Concrete C. SYMBOLS Height of Concrete A 7.12 = 3.56 ft. d = Outside Diameter of Pipe in Feet = Hm = 220 T = Thrust in Pounds at the Fitting (Table 1) - Required Amount of Concrete = (Height x Depth x Length) x 0.03704 SBL = Safe Bearing Load in Pounds Sq. Ft. (Table 2) = (Hm x Lm x Dc) x 0.03704 h = Depth of Trench in Feet = (2.0 x 3.56 x 1.13) x 0.03704 W = Width of Trench in Feet = 0.30 cu. yd. A = Area of Concrete which must bear against the Side of the Trench in Sq. Ft. TABLE 1 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 h ` d h Hm= 2 - BLOCK BASE D` w D. CALCULATION EQUATIONS 1. Area of Concrete (A) = Thrust (In Pounds = T Safe Bearing Load (In Pounds/Sq. Ft.) SBL 2. Maximum Height of Thrust Block (Hm) = Depth of Trench in Feet = h 2 2 Width of Trench in Feet) - 3. Depth of Concrete Thrust Block -_ (Ou side Diameter of Pipe In Feet) = W-d 2 2 4. Maximum Length of Thrust Block (Lm) = Area of Concrete = A Maximum Height Hm 5. Required Amount of Concrete (Cu. Yd.) = Height x Depth x Lenggth) x 0.03704 _ �Hm x Lm x Dc) x 0.03 04 E. EXAMPLE 2. Problem: Calculation of the amount of concrete 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. 4" 90' BEND (MJ) 4" FLxMJ ADAPTOR 4" TEE (MJxFL) 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 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 SOFT CLAY 1,000 SAND 2,000 SAND AND GRAVEL 3,000 SAND AND GRAVEL CEMENTED WITH CLAY 4,000 HARD SHALE 10,000 SIN 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. 4" GATE VALVE (MJxMJ) 2-3/4" SHACKLE RODS PER CITY OF RENTON SPECIFICATIONS 13 LF 4" D.I. 12" 7'-0" J �. LADDER WITH SUPPORT BARS 2'-4" PER OSHA � °Oo EPDXY NON -SHRINK GROUT 2'-4" PRECAST CONCRETE VAULT WITH 2 3"x3" HINGED STEEL PLATE COVER. OUTSIDE DIMENSIONS 4'-8"x7'-0". (EQUAL TO PIPE INC., OR UTILITY VAULT WITH 57-7L-8, 2 3'x3' DIAMOND PLATE DOORS) 4" OR 3" GATE VALVE (FLxFL) NON -RISING STEM TOUCHREAD PITLID SENSOR WITH HAND WHEEL EQUAL TO MUELLER CO.A-2380-6. MOUNTED ON STEEL PLATE 3" � 4" COVER 4" (FLxPE) CEMENT LINED o N DUCTILE IRON PIPE CLASS 52 3'-6" LONG WITH COLLAR 20" FROM P.E. EQUAL TO THOSE SUPPLIED BY PACIFIC WATER WORKS CO. INC. Fn z 16"' O 12" APO_ND w - - 0 12" 7 1 4" OR 3" COMPOUND WATER METER (FL) EQUAL TO SENSUS SRH COMPOUND METER WITH TOUCHREAD PITLID REGISTER & SENSOR. REDUCE AT METER WITH 4"X3" FLxFL CONCENTRIC REDUCER. 71 &VtR.t.P.pojq CONCRETE SUPPORT PADS OR ADJUSTABLE PIPE SUPPORTS. 4" 90' BEND (MJ) 4" FLxMJ ADAPTOR TEE 22-1/20 450BEND FIGURE 1 NOTE: FOR CONVEX VERTICAL BENDS BLOCKING SEE APWA STANDARD PLAN NO. 73. Thrust Blocking Table NOTE: DEADMAN BLOCK SHALL BE DESIGNED AND INSTALLED SO IT BEARS AGAINST SUFFICIENT UNDISTURBED EARTH SO AS TO SUPPORT THE DESIGNED THRUST. 4" TEE (FL) DEADMAN BLOCK REQUIRED WITH SHACKLING TO TEE TWO PIECE CAST IRON VALVE BOX, EQUAL TO OLYMPIC FOUNDRY CO. STANDARD 8" TOP SECTION, WITH REGULAR BASE SECTION LENGTH TO FIT. �- VALVE NUT EXTENSION IF REQUIRED (DWG BR46/PAGE 8090) 4" OR 3" GATE VALVE (FLxMJ) EQUAL TO MUELLER CO. A-2380-20. � u 14" -4" PExPE CEMENT LINED DUCTILE IRON PIPE CLASS 52. LENGTH TO FIT. - 4" FLEXIBLE FLANGED COUPLING ADAPTOR, ROMAC OR APPROVED EQUAL. MORTAR FILLET WATER 2" CLOSE 2" 90' LLUUVV TWO PIECE CAST IRON VALVE BOX EQUAL TO RICH VALVE CO. STANDARD 8" TOP SECTION, WITH REGULAR BASE SECTION LENGTH TO FIT. 2" GALVANIZED IRON PIPE 12" LONG SANITARY MANHOLE TYPICAL DETAIL NOT TO SCALE COUGHLIN PORTERLUNDEEN 3 A CONSULTING STRUCTURAL AND CIVIL ENGINEERING CORPORATION 3° and 4' Compound Meters 217 PINE STREET - SUITE 300 P: 206/343-0460 SEATTLE, WA 98101 F: 206/343-5691 PLAN CONC.REJE DEAD MAN BLOCKING WITH SHACKLE RODS TO CAP, BLOCK HALL BE POURED AGAINST UNDISTURBED EARTH, SIZE OF BLOCK TO BE DETERMINED BASED ON TEST PRESSU OF WATER LINE AND SOIL CHARACTERISTICS. - i CAST IRON CAP OR PLUG WITH 2" IPS TAP SHALL BE A ROCKWELL 482 END CAP COUPLING. 9 2" GALVANIZED IRON PIPE AS REQUIRED. 1 N PIPE," LONG. VALVE BUT EXTENSION IF REQUIRED (SEE *G BR46 / PAGE B090) INSTALL 2" 90' ELBOW, SCREWED 2" PLUG, SCREWED 2" GALVANIZED IRON PIPE AS REQUIRED. 2" GATE VALVE, SCREWED INSTALL 2" 90' ELBOW, SCREWED 2" GALVANIZED IRON PIPE AS REQUIRED. ELEVATION MANHOLE FRAME AND COVER SEE DRAWING BR29 ADJUSTMENT (4" MIN.) CONE RUBBER GASKETED JOINTS IN ACCORDANCE WITH ASTM C-443 STEPS - 3/4" DEFORMED BAR STEPS SHALL BE INCLUDED CONCRETE RISER BY PIPE INC., OR APPROVED EQUAL. MAX. PIPE SIZE - 21" I.D. LADDER -STD. ALUMINUM OR GALVANIZED STEEL CONCRETE SHELF PRECAST BASE SECTION OR CAST IN SHELF. C,po� tiw ��ss10NAL = RES 01/2- D TEXT D NOTE, EDIT TEXT Temporary 2" Blow -off Assembly 2 CITY OF RENTON MENDED FOR AfMVAL DATE:... IWqm3029O2 NOTES: 1. STEPS TO BE 3/4" 0 DEFORMED BAR GALVANIZED SAFETY STEPS OR EQUAL. 2. STEPS ARE TO BE IN PLACE BEFORE MANHOLE SECTIONS ARE INSTALLED. 3. CASTING TO BE PER DRAWING BR29. 4. MANHOLE SECTIONS TO BE OF REINFORCED PRECAST CONCRETE. 5. ALL JOINTS SHALL BE GROUTED. 6. SANITARY SEWER MANHOLES SHALL HAVE ALL INTERIOR SURFACES, INCLUDING CHANNELING, COATED (SEALED) WITH A HIGH SOLIDS URETHANE COATING; WASSER MC-CONSEAL OR APPROVED EQUAL; - - --. COLOR OF COATING SHALL BE WHITE. ► RUBBER GASKETED JOINTS SHALL BE IN CONFORMANCE I WITH ASTM C-443. 8. CHANNEL HEIGHT SHALL BE A MINIMUM OF 3/4 THE INSIDE DIAMETER OF THE LARGEST PIPE. 9. CONNECTIONS TO MANHOLE SHALL BE MADE USING GPK ADAPTOR, KOR-N-SEAL BOOTS OR APPROVED EQUAL. Sanitary Manhole Typical Detail 4 ar #4F Professional Plaza c"crT eti, ®iegard, Medina, Washington 98039 ' UT111 DETAILS x x C7 r �j t) Cn ab N CD O N tT7 ttTt Cn ah Cn o �°z �a �r `. b a Y 0