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- 46-3.02B Steel
- 46-3.02C Bar Reinforcement
- 46-3.02D Sheathing
- 46-3.03 CONSTRUCTION
- 46-3.03B Test Soil Nails
- 46-3.03C Installation
46-3.02 MATERIALS46-3.02A GeneralEach production soil nail must be either a reinforcing bar encapsulated full length in a grouted corrugated plastic sheathing or an epoxy-coated prefabricated reinforcing bar partially encapsulated in a grouted corrugated plastic sheathing. The epoxy-coated prefabricated reinforcing bar must comply with section 52-2.03, except the epoxy thickness must be from 10 to 12 mils. Bar reinforcement for test soil nails is not required to be epoxy coated or encapsulated in grouted plastic sheathing.
Concrete anchors on bearing plates must comply with the specifications for studs in clause 7 of AWS D1.1. 46-3.02C Bar ReinforcementBar reinforcement must comply with section 52. For bar reinforcement for production soil nails: 1. Grade 60 bar reinforcement must comply with ASTM A615/A615M or A706/A706M. 2. Grade 75 bar reinforcement must comply with ASTM A615/A615M. 3. Reinforcement must have at least a 6-inch length of thread on the anchorage end. Threading must be either continuous spiral deformed ribbing provided by the bar deformations or cut into the bar. For bars with cut threads, use the next larger bar size from that shown and use coarse threads. 4. Epoxy coating at the anchorage end of epoxy-coated bars may be omitted for no more than 6 inches. 5. Metal surfaces of assembled splices of epoxy-coated bars must be epoxy coated.
46-3.02E GroutFor drilled holes 6 inches or larger in diameter, you may add fine aggregate to the grout. Grout with fine aggregate must: 1. Contain at least 845 pounds of cement per cubic yard of grout 2. Use fine aggregate that complies with section 90-1.02C 3. Have a nominal penetration of at least 3-1/2 inches when measured under California Test 533 4. Have an air content of no more than 2 percent when measured under California Test 504 5. Not contain air-entraining admixtures 46-3.03 CONSTRUCTION46-3.03A GeneralDetermine the drilled hole diameter and installation method required to achieve the soil nail pullout resistance values shown. Do not drill for proof test or production soil nails in a wall zone until stability testing, if required, and verification soil nail testing are complete in the wall zone and the test results are authorized. If you are ordered to lengthen verification or proof test soil nails, the lengthening of test soil nails is change order work. If you are ordered to lengthen production soil nails or install additional production soil nails, the lengthening or addition of production soil nails is change order work. 46-3.03B Test Soil NailsConstruct verification and proof test soil nails using the same equipment, methods, nail inclination, and drilled hole diameter as to be used for production soil nails. Drill, install, and grout verification test soil nails in the Engineer's presence. You may install verification test soil nails by any of the following means: 1. Through the existing slope face. 2. Through the drill platform work bench. 3. Through the stabilization berm. 4. Through the stability test exposed face. 5. Into slot cuts made for the lift in which verification test soil nails are located. A slot cut must be no larger than is needed to accommodate the drill and test setup equipment. Install the verification test soil nails within the limits of each wall zone or within the limits of the excavated stability test face. Space the verification test soil nails at least 10 feet apart. Grout only the bonded length of verification and proof test soil nails. Do not splice a test soil nail within the bonded length. Remove each verification and proof test soil nail to 6 inches behind the front face of the shotcrete after testing is complete. Fill the void with grout. If requested, extract the verification and proof test soil nails and fill the voids with grout.
Use centralizers to support the soil nail in the center of the drilled hole. Space the centralizers at 7.5 feet maximum along the bar length and 1.5 feet from the bar ends. You may use plastic centralizers. Splice the bar reinforcement only where shown on the authorized shop drawings or at the end of a soil nail that is ordered to be lengthened. Verify and record the drilled hole length before grouting. Grout the drilled hole after installing the soil nail. Inject the grout at the low end of the drilled hole. Fill the drilled hole with a dense grout, free of voids and foreign material. Grout the hole in 1 continuous operation. Do not use cold joints in the grout placement. Fill any void remaining at the open end of the drilled hole of a production soil nail with shotcrete. Secure the soil nail at the face of the shotcrete. The bearing plate must have full bearing on the shotcrete surface. Hand tighten the nut on the end of the production soil nail bar before the initial set of the shotcrete. Make the nut wrench tight after the shotcrete has set for 24 hours, unless a shorter time is authorized. After placing the grout, the soil nails must remain undisturbed for the minimum cure time shown on the authorized shop drawings. Directory: esc esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko esc -> Escort affinity Program for Audi Club Members esc -> Preliminary entry form pistol esc -> Application form esc -> Request from Asian and Pacific Training Centre for Information and esc -> Constitution of the engineering student council university of maryland esc -> Subdisciplines of Earth Science Geology; study of the earth Download 6.74 Mb. Share with your friends:
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