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MASH Jan 2019 Drawing Transmittal

Question
State SC
Description Text
 We have a few drawings that we would like for the pooled fund to review for us. It would be helpful to us to receive comments back from you by June 29, 2018, if possible. 
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As Discussed, we will be sending final draft versions of standard drawings after we have completed our internal review.

Please distribute to FHWA and any other office that you feel is appropriate for final review/comment.

We would like to have comments back within 3 weeks from the date of this email. We will send each drawing separately with a brief description of changes and implementation schedule.

719-920-00 4' SLOPE FLUME (CURB STYLE WITH CUTOFFS) 2019, January
805-325-75 FLUME INLET AT GUARDRAIL (HANDWORK) 2019, January
805-210-05 MGS3 GUARDRAIL WITH 1 OMITTED POST (12' CLEAR SPAN) 2019, January
805-545-00 GUARDRAIL RELATED MULTIPLE OFFSET BLOCKS FOR MGS AND MTBBC SERIES DEVICES 2019, January
805-825-00 SHAPE TRANSITION THRIE-BEAM TO SINGLE SLOPE 2019, January


Design:
New Flume Standards 719-920-00 and 805-325-75 with PCDM-15 instructions
Flume Detail Matches Attached Photo from District 6, with 4’ width to simulate Catch Basin Type 16 inlet

Construction:
Flume Detail Matches Attached Photo from District 6, 4’ wide
New Standards replace drawings 403-2XX-XX (will be removed upon publication of new details)

Design:
805-210-05
Minimum length of MGS3 item required, cannot use with Curb (MGS2C) or Compressed Shoulder (MGS3CS) items
10’ minimum design deflection distance required to dropoff
No additional pay item required

Construction:
No separate measurement or payment
No nesting required


Design:
805-545-00
No additional pay item required

Construction:
No separate measurement or payment
Rules for using 2 or 3 blocks have not changed from Pre-MASH standards
8” offset blocks required for 16” overall detail (use same 8” block as old W-Beam standards)


Design:
805-825-00
No changes to pay item 8058860 Provide enough LF at each end with Standard Guardrail connection to complete height transition shown in detail 2.

Construction:
Adjusted position of handwork due to MASH MTBBC series details


Approach Guardrail Transitions (AGTs)
Road Closure Gates
Thrie Beam Guardrails


Date June 14, 2018
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Attachment MASH2019-Draft.zip
Response
Response
(active)

I have attached a PDF of the comments I have on your drawings.  Also, we are encouraging all of the DOTs to adopt the Standardized End Buttress for use with Thrie-beam guardrail transitions.  Utilization of the Standardized Buttress will upgrade all previous NCHRP 350, thrie beam transitions to MASH crashworthy systems.  I have attached a drawing set for the Standardized buttress as well as the TRB journal paper recently published on the development and installation guidance for the buttress.

 
Date June 25, 2018
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Attachment AGT Buttress-2_R4.pdf Attachment MwRSF Comments on std Drawings.pdf Attachment TRR_2018_Standardized_Buttress_AGT.pdf