Difference between revisions of "Category:216 Removals for Bridge Structures"
m (updated links) |
(Per BR, deck rehabilitation guidance has been updated to current methods. Pay items updated for monolithic deck repair to supplementary wearing surface material. Rehabilitation design guidance was expanded) |
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| Line 19: | Line 19: | ||
As specified. | As specified. | ||
| − | ===Scarification of Bridge | + | ===Scarification of Bridge Deck ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=5 Sec 216.20])=== |
'''Description''' | '''Description''' | ||
| Line 46: | Line 46: | ||
As specified. | As specified. | ||
| + | |||
| + | In order to determine the accepted quantities of the new wearing surface, it is important to obtain accurate measurements to determine the following: | ||
| + | ::Average depth of existing wearing surface | ||
| + | ::Average depth of scarification | ||
| + | ::Average depth of additional deck removed with the removal of the wearing surface | ||
| + | |||
| + | Existing wearing surface in excess of plan thickness will require additional new wearing surface material without an acceptable adjustment to grade. The volume of this additional material should not need to be excluded from the accepted quantities of the new wearing surface. | ||
| + | |||
| + | Scarification in excess of the plan thickness and additional deck removed with the removal of the wearing surface in excess of the plan thickness will both require additional new wearing surface material. An adjustment to grade will not be acceptable in these situations and the volume of the additional material will need to be excluded from the accepted quantities of the new wearing surface. | ||
'''Method of Measurement''' | '''Method of Measurement''' | ||
| Line 55: | Line 64: | ||
As specified. | As specified. | ||
| − | ===Removal and Storage of Existing Bridge | + | ===Removal and Storage of Existing Bridge Rail ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=5 Sec 216.40])=== |
'''Description''' | '''Description''' | ||
| Line 73: | Line 82: | ||
As specified. | As specified. | ||
| − | ===Removal of Existing Bridge | + | ===Removal of Existing Bridge Deck ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=5 Sec 216.50])=== |
'''Description''' | '''Description''' | ||
| Line 91: | Line 100: | ||
As specified. | As specified. | ||
| − | ===Partial Removal of Existing Bridge | + | ===Partial Removal of Existing Bridge Deck ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=5 Sec 216.60])=== |
'''Description''' | '''Description''' | ||
| Line 153: | Line 162: | ||
As specified. | As specified. | ||
| − | ===Removal of Existing Expansion | + | ===Removal of Existing Expansion Joint and Adjacent Concrete ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=5 Sec 216.90])=== |
'''Description''' | '''Description''' | ||
| Line 195: | Line 204: | ||
'''Basis of Payment''' | '''Basis of Payment''' | ||
| + | |||
| + | As specified. | ||
| + | [[image:216 surface hydro.jpg|right|300px]] | ||
| + | ===Total Surface Hydro Demolition ([http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=5 Sec 216.110])=== | ||
| + | |||
| + | '''Description ''' | ||
| + | |||
| + | As specified. | ||
| + | |||
| + | '''Material''' | ||
| + | |||
| + | As specified. | ||
| + | |||
| + | '''Removal and Repair Prior to Hydro Demolition''' | ||
| + | |||
| + | As specified. | ||
| + | |||
| + | ::'''1. Removal of Existing Deck Repair (if specified in the contract)''' | ||
| + | |||
| + | ::One of the issues with detecting and removing sound and unsound previous conventional deck repairs, is that sometimes the repairs themselves can be hard to distinguish from the deck itself. After milling the deck is quite dirty and everything blends together. The specified water blasting is very important to get the deck adequately cleaned so the inspectors can see everything. | ||
| + | ::All previous conventional deck repairs, regardless of condition, need removed prior to hydro demolition for the following reasons. | ||
| + | :::- The majority of previous conventional deck repair that appear to be sound prior hydro demolition becomes unsound during hydro demolition needing removal after hydro demolition. | ||
| + | |||
| + | :::- Previous sound conventional deck repair protrudes into the new wearing surface creating a weaker area of the wearing surface. | ||
| + | :::- Conventional deck repair is inferior to a hydro demolition due to the creation of microcracks into the deck at the interface of the patch and the existing deck. Removing previous conventional deck repairs even in good condition is akin to removing a bandage in order to better clean the area and replace with a better performing bandage. | ||
| + | ::If unable to discern patches from original deck, refer to the district office for assistance with Division of Construction and Materials. | ||
| + | ::'''2. Zoned Conventional Deck Repair (if specified in the contract) ''' | ||
| + | |||
| + | ::As specified. | ||
| + | |||
| + | '''Total Surface Hydro Demolition ''' | ||
| + | |||
| + | As specified. | ||
| + | |||
| + | In order to determine the accepted quantities of the new wearing surface, it is important to obtain accurate measurements to determine the average depth of hydro demolition in areas of sound concrete. | ||
| + | [[image:216 measure.jpg|center|700px]] | ||
| + | |||
| + | Hydro demolition (in areas of sound concrete) in excess of the plan thickness will require additional new wearing surface material. An adjustment to grade will not be acceptable and the volume of the additional material will need to be excluded from the accepted quantities of the new wearing surface. | ||
| + | |||
| + | '''Method of Measurement ''' | ||
| + | |||
| + | As specified. | ||
| + | |||
| + | '''Basis of Payment ''' | ||
As specified. | As specified. | ||
Revision as of 10:44, 4 February 2020
Contents
- 1 216.1 Construction Inspection Guidance for Sec 216
- 1.1 Removal of Bridges (Sec 216.10)
- 1.2 Scarification of Bridge Deck (Sec 216.20)
- 1.3 Seal Coat and Wearing Surface Removal (Sec 216.30)
- 1.4 Removal and Storage of Existing Bridge Rail (Sec 216.40)
- 1.5 Removal of Existing Bridge Deck (Sec 216.50)
- 1.6 Partial Removal of Existing Bridge Deck (Sec 216.60)
- 1.7 Partial Removal of Culvert and Substructure Concrete (Sec 216.70)
- 1.8 Curb Removal (Sec 216.80)
- 1.9 Removal of Existing Expansion Joint and Adjacent Concrete (Sec 216.90)
- 1.10 Removal of Existing Expansion Joint Seal or Sealant (Sec 216.100)
- 1.11 Total Surface Hydro Demolition (Sec 216.110)
216.1 Construction Inspection Guidance for Sec 216
Removal of Bridges (Sec 216.10)
Description
As specified.
Removal Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Scarification of Bridge Deck (Sec 216.20)
Description
As specified.
Removal Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Seal Coat and Wearing Surface Removal (Sec 216.30)
Description
As specified.
Removal Requirements
As specified.
In order to determine the accepted quantities of the new wearing surface, it is important to obtain accurate measurements to determine the following:
- Average depth of existing wearing surface
- Average depth of scarification
- Average depth of additional deck removed with the removal of the wearing surface
Existing wearing surface in excess of plan thickness will require additional new wearing surface material without an acceptable adjustment to grade. The volume of this additional material should not need to be excluded from the accepted quantities of the new wearing surface.
Scarification in excess of the plan thickness and additional deck removed with the removal of the wearing surface in excess of the plan thickness will both require additional new wearing surface material. An adjustment to grade will not be acceptable in these situations and the volume of the additional material will need to be excluded from the accepted quantities of the new wearing surface.
Method of Measurement
As specified.
Basis of Payment
As specified.
Removal and Storage of Existing Bridge Rail (Sec 216.40)
Description
As specified.
Storage Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Removal of Existing Bridge Deck (Sec 216.50)
Description
As specified.
Removal Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Partial Removal of Existing Bridge Deck (Sec 216.60)
Description
As specified.
Removal Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Partial Removal of Culvert and Substructure Concrete (Sec 216.70)
Description
As specified.
Material
As specified.
Removal Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Curb Removal (Sec 216.80)
Description
As specified.
Material
As specified.
Removal Requirements
As specified
Method of Measurement
As specified.
Basis of Payment
As specified.
Removal of Existing Expansion Joint and Adjacent Concrete (Sec 216.90)
Description
As specified.
Material
As specified.
Removal Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Removal of Existing Expansion Joint Seal or Sealant (Sec 216.100)
Description
As specified.
Material
As specified.
Removal Requirements
As specified.
Method of Measurement
As specified.
Basis of Payment
As specified.
Total Surface Hydro Demolition (Sec 216.110)
Description
As specified.
Material
As specified.
Removal and Repair Prior to Hydro Demolition
As specified.
- 1. Removal of Existing Deck Repair (if specified in the contract)
- One of the issues with detecting and removing sound and unsound previous conventional deck repairs, is that sometimes the repairs themselves can be hard to distinguish from the deck itself. After milling the deck is quite dirty and everything blends together. The specified water blasting is very important to get the deck adequately cleaned so the inspectors can see everything.
- All previous conventional deck repairs, regardless of condition, need removed prior to hydro demolition for the following reasons.
- - The majority of previous conventional deck repair that appear to be sound prior hydro demolition becomes unsound during hydro demolition needing removal after hydro demolition.
- - Previous sound conventional deck repair protrudes into the new wearing surface creating a weaker area of the wearing surface.
- - Conventional deck repair is inferior to a hydro demolition due to the creation of microcracks into the deck at the interface of the patch and the existing deck. Removing previous conventional deck repairs even in good condition is akin to removing a bandage in order to better clean the area and replace with a better performing bandage.
- If unable to discern patches from original deck, refer to the district office for assistance with Division of Construction and Materials.
- 2. Zoned Conventional Deck Repair (if specified in the contract)
- As specified.
Total Surface Hydro Demolition
As specified.
In order to determine the accepted quantities of the new wearing surface, it is important to obtain accurate measurements to determine the average depth of hydro demolition in areas of sound concrete.
Hydro demolition (in areas of sound concrete) in excess of the plan thickness will require additional new wearing surface material. An adjustment to grade will not be acceptable and the volume of the additional material will need to be excluded from the accepted quantities of the new wearing surface.
Method of Measurement
As specified.
Basis of Payment
As specified.
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