Class 1 Bedding Material

Bedding C Y4Bc L.F.=2.8 8"min Bedding C Bedding A BEDDING 1.9 12" Bedding B Bedding A BEDDING 1.5 12"min Ill CONCRETE CRADLE CLASS Backfill 12"min FOUNDATION Backfill CLASS Ill BEDDING Shall be used for reinforced concrete pipe and asbestos cement pipe unless otherwise shown on project plans. edding B Bedding A 0.6Bc Bedding B Clean sand GRANULAR • Shaped trench bottoms may be used in lieu of the standard trench detail shown in Figure 1, provided a free flowing pea gravel or small rock chips are used to fill in the resultant void areas. Pea gravel or small chips shall be clean material passing a 3/8 inch (9.5mm) sieve meeting the class I, II, or III requirements of ASTM D 2321.

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2.2 EXCAVATED BEDDING MATERIAL .1 Excavated bedding material for Class "C" or "D" Bedding installation shall be unfrozen clay, silt, sand or gravelly sand excavated from the trench which shall be free from stones and hard lumps of earth larger than 10 mm in diameter or as otherwise approved by the Engineer.

Class 1 bedding material. There are numerous pipe bedding Classes such as Class S, B, F and N with different construction details using varying amounts of imported granular material and different load distribution characteristics. Bedding Classes B, F and N require significantly less granular material than Class S which requires a pipe to be completely surrounded. 2.02 BEDDING MATERIAL A. Class I Material: 1. Crushed stone complying with the following gradation: Sieve Percent Passing 1 1/2” 100 1” 95 to 100 1/2" 25 to 60 No. 4 0 to 10 No. 8 0 to 5 2. The Engineer may allow the use of gravel or authorize a change in gradation subject to materials available locally at the time of construction. 3. 1) Locate utilities 2) Excavate trench 3) Explore foundation 4) Place structural bedding material to grade. Do not compact. 5) Install pipe to grade 6) Compact structural bedding outside the middle third of the pipe 7) Place structural bedding in lifts

A. Pipe Bedding Materials 1. Type 1 Bedding material around the pipe from six (6) inches under the pipe to twelve (12) inches over the pipe shllhall consist of course grained soils ( over 50% retained on a No. 200 Sieve) and less than 5% fines such as gravel, sand, or silty sand meeting Granular fill to be in compliance with BS 882 . The type of granular bedding used will dependant on your location, typically a single sized pea gravel would be used, however there is a definite push towards a more environmentally friendly form of bedding materials such as recycled glass and slate aggregates that are the bye-product of other industries. Released 1/28/201 5 KUB STANDARDS AND SPECIFICATIONS 02321- 4 2.06 SOURCE QUALITY CONTROL A. Perform gradation analysis in accordance with ASTM C136 for: 1. Imported earth backfill, including specified class. 2. Trench stabilization material. 3. Pipe zone material.

Class D - Load Factor 1.1 Using this bedding, little care is exercised to shape the pipe foundation and to compact bedding material around the pipe. This bedding method is NOT RECOMMENDED as a bedding alternative. Class C - Load Factor 1.5 With 'C' bedding, ordinary care is used to shape the bottom of the trench directly under the pipe. Class B 180° Granular bedding and surround / Bedding factor = 1.9 Lay pipes on a layer of granular bedding material on the formation. Scoop out socket holes, lay and joint pipes. Place sidefills and densely compact the layers of the same bedding material at each side of pipes, up to springing level, taking care not to displace them. 20.2.1. Foundation Stabilizer Material . 3/4" to 1 1/2" dense, durable rock with less than fifteen (15) percent passing the #4 sieve. 20.2.2. Bedding . Free draining material meeting the Specifications and gradation for the specific application set forth as follows:

a. classes of bedding b. concrete cradle bedding, class a c. first class bedding, class b d. ordinary bedding, class c e. special bedding, class d 6.33 trench backfill a. backfilling b. common trench backfill c. backfill around structures and appurtenances d. backfill material e. backfill moisture control 1 O F 1 BEDDING CLASSES ALLOWABLE BURY DEPTH F I G U R E SW-104 REVISION 04-21-20 SHEET 1 of 1 REVISIONS:Modified PVC Table Title. 2 PRESSURE PIPE TRENCH BEDDING FIGURE 3010.104 STANDARD ROAD PLAN SUDAS DIRECTOR DESIGN METHODS ENGINEER TW TW TW Material with Bell Shaping Material or Undisturbed Loose, Suitable Backfill Class I Bedding Material. Metal: Use either flow-fill or Class 1**. Plastic: Use flow-fill or Class 1. Concrete: Use Class 1** with 3 inches of bedding material. ** Backfill Class 2 may be specified only if material generated on the project meets the requirements for Class 1. For all pipe trenches in rock, a 12" layer of Backfill Class 1 is required beneath the pipe.

Class E Backfill as defined in the Standard Specifications for Public Works Construction, Aggregates for Bedding and Backfill. 5.04.05 Substitute Material: Substitute bedding and backfill materials may only be used if prior written approval from TMWA is received. In requesting the use of a substitute material, the The foundation is the inplace material beneath the pipe. If the foundation is unsuitable, it must be removed and replaced with a suitable material. Bedding The bedding is the material placed in the bottom of the trench on which the pipe is laid. Embedment The embedment is the soil placed to support the load on the pipe. For rigid pipe, Astm Class 1 Pipe Bedding Material. Products here may not be the best, but each product is carefully selected by us. We are not the top online store, but we provide better service. If you are interested in Astm Class 1 Pipe Bedding Material, we are sure you find the right place.

ASTM C12 Bedding Classes for VCP www.ncpi.org • info@ncpi.org • N6369 US Hwy 12, Suite A Elkhorn, WI 53121 • 262-742-2904 Class D Bedding – Load Factor = 1.1 Class B Bedding – Load Factor = 1.9 Class C Bedding – Load Factor = 1.5 Crushed Stone Encasement Bedding – Load Factor = 2.2 For Class I granular bedding material, determine gradation according to ASTM C 136. C. Field Testing: 1. Testing Frequency and Locations: Perform testing of the final trench backfill, beginning at a depth of 2 feet above the top of the pipe, as follows: a. Coordinate the timing of testing with the Engineer..

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