Category:712 Structural Steel Construction - Revision history

Hoskir: /* 712.1.7 Non-destructive Testing */ updated per RR3930

2024-09-06T13:45:07Z

712.1.7 Non-destructive Testing: updated per RR3930

← Older revision		Revision as of 08:45, 6 September 2024
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	In certain instances, non-destructive testing (NDT) may be required to be conducted on steel components of a bridge. The contractor will be responsible for providing and certified NDT technician to conduct the testing. This technician will usually be an employee of a third party inspection agency. Certification for NDT technicians will be in accordance with the requirements of The American Society for Nondestructive Testing (ASNT) Recommended Practice SNT-TC-1A. MoDOT does not maintain an approved list of NDT technicians. The Bridge Division does review certifications for testing agencies and keep a list of personnel of these agencies with their respective certifications.		In certain instances, non-destructive testing (NDT) may be required to be conducted on steel components of a bridge. The contractor will be responsible for providing and certified NDT technician to conduct the testing. This technician will usually be an employee of a third party inspection agency. Certification for NDT technicians will be in accordance with the requirements of The American Society for Nondestructive Testing (ASNT) Recommended Practice SNT-TC-1A. MoDOT does not maintain an approved list of NDT technicians. The Bridge Division does review certifications for testing agencies and keep a list of personnel of these agencies with their respective certifications.

	For projects that require NDT in the field, the inspector will collect the information from the contractor as to who will be providing the NDT services. The ~~inspector will then contact the Bridge Division Fabrication Section to determine if the NDT technician’s certifications have been reviewed. If the certifications have not been reviewed, the~~ contractor shall submit the certifications to the Resident Engineer to be forwarded to the Bridge Division at [mailto:Fabrication@modot.mo.gov Fabrication@modot.mo.gov]. These certifications shall include, ~~as a minimum~~, the ~~technicians test scores~~, ~~work experience, and annual eye exam results~~.		For projects that require NDT in the field, the inspector will collect the information from the contractor as to who will be providing the NDT services. The contractor shall submit the certifications to the Resident Engineer to be forwarded to the Bridge Division at [mailto:Fabrication@modot.mo.gov Fabrication@modot.mo.gov]. These certifications shall include the following documentation for each individual performing NDT: their certifications, current eye exam, and the NDT company written practice, including the Level III individual certification used for the written practice.

	At the Resident Engineer’s option, they may choose to keep a list of personnel who have performed NDT work for a quick reference for future projects. However, the Resident Engineer and the inspector will always request to see the current eye exam results prior the technician providing the NDT on these future projects.		At the Resident Engineer’s option, they may choose to keep a list of personnel who have performed NDT work for a quick reference for future projects. However, the Resident Engineer and the inspector will always request to see the current eye exam results prior the technician providing the NDT on these future projects.

Hoskir: /* 712.1.5.4.2.3 A325TC/A490TC Tension Control Bolt */

2022-12-16T14:48:25Z

712.1.5.4.2.3 A325TC/A490TC Tension Control Bolt

← Older revision		Revision as of 09:48, 16 December 2022
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	Rotational Capacity Testing is based on Table 712.1.5.4.3.3. Bolt checks will need to address questions shown in the table.		Rotational Capacity Testing is based on Table 712.1.5.4.3.3. Bolt checks will need to address questions shown in the table.

	Bolt inspection acceptance by load indicating bolt method will be made using Sec 712.7.76 and Sec 712.7.12(c).		Bolt inspection acceptance by load indicating bolt method will be made using Sec 712.7.7 and Sec 712.7.12(c).

	=====712.1.5.4.3 Step 3, Rotational Capacity=====		=====712.1.5.4.3 Step 3, Rotational Capacity=====

Hoskir: /* 712.1.5.4.2.2 A325/A490 Hex Head Bolt */

2022-12-15T20:56:41Z

712.1.5.4.2.2 A325/A490 Hex Head Bolt

← Older revision		Revision as of 15:56, 15 December 2022
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	The use of A325/A490 bolts will come with standard nuts, bolts, and washers. These will be tightened in the field using air tools and torque wrenches.		The use of A325/A490 bolts will come with standard nuts, bolts, and washers. These will be tightened in the field using air tools and torque wrenches.

	Rotational Capacity Testing is based on Table 712.1.5.4.3.1, Long Bolts, or& 712.1.5.4.3.2, Short Bolts. Bolt checks will need to address questions shown in the table used.		Rotational Capacity Testing is based on Table 712.1.5.4.3.1, Long Bolts, or 712.1.5.4.3.2, Short Bolts. Bolt checks will need to address questions shown in the table used.

	Bolt inspection acceptance by calibrated wrench will be made using Sec 712.7.5 and Sec 712.7.12(c).		Bolt inspection acceptance by calibrated wrench will be made using Sec 712.7.5 and Sec 712.7.12(c).

Hoskir: /* 712.1.5.4.2 Step 2, Inspection Type Selection */

2022-12-15T20:44:18Z

712.1.5.4.2 Step 2, Inspection Type Selection

← Older revision		Revision as of 15:44, 15 December 2022
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	=====712.1.5.4.2 Step 2, Inspection Type Selection=====		=====712.1.5.4.2 Step 2, Inspection Type Selection=====

	The second step is to determine the inspection type. The information below shows how to proceed once it is determined what type of bolt is being used in the field. The bolt type and verification method available will dictate the options and the requirements needed to follow for inspection in the field.		The second step is to determine the inspection type. The information below shows how to proceed once it is determined what type of bolt is being used in the field. The bolt type and verification method available will dictate the options and the requirements needed to follow for inspection in the field.

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	======712.1.5.4.2.1 Bolt Type======		======712.1.5.4.2.1 Bolt Type======

	The first step is to find out what type of bolt you are using in the field. The bolt type will dictate how much information is needed for the Rotational Capacity Testing.		The first step is to find out what type of bolt you are using in the field. The bolt type will dictate how much information is needed for the Rotational Capacity Testing.

	======712.1.5.4.2.2 A325/A490 Hex Head Bolt======		======712.1.5.4.2.2 A325/A490 Hex Head Bolt======

	The use of A325/A490 bolts will come with standard nuts, bolts, and washers. These will be tightened in the field using air tools and torque wrenches.		The use of A325/A490 bolts will come with standard nuts, bolts, and washers. These will be tightened in the field using air tools and torque wrenches.

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	======712.1.5.4.2.3 A325TC/A490TC Tension Control Bolt======		======712.1.5.4.2.3 A325TC/A490TC Tension Control Bolt======

	The use of A325TC/A490TC bolts will come with nuts, bolts and washers. These will be tightened in the field using a specialized tool designed to tighten the nut and the spline of the bolt.		The use of A325TC/A490TC bolts will come with nuts, bolts and washers. These will be tightened in the field using a specialized tool designed to tighten the nut and the spline of the bolt.

Hoskir: /* 712.1.5.4.2 Step 2, Inspection Type Selection */ updated per RR 3523

2022-12-15T20:31:46Z

712.1.5.4.2 Step 2, Inspection Type Selection: updated per RR 3523

@@ Line 286: / Line 286: @@
 =====712.1.5.4.2 Step 2, Inspection Type Selection=====
-The second step is to determine the inspection type. The flowchart below gives information on how to proceed once it is determined what type of bolt is being used in the field. The bolt type and verification method available will dictate the options and the requirements needed to follow for inspection in the field.
+The second step is to determine the inspection type. The information below shows how to proceed once it is determined what type of bolt is being used in the field. The bolt type and verification method available will dictate the options and the requirements needed to follow for inspection in the field.
 Prior to going into the field, determine the bolt type and the inspection method that will be used. This will allow you to know the equipment needed and discuss test procedures with the contractor.  For some test methods, the contractor will provide the calibrated equipment to check the bolts.
-[[image:Flowchart-High_Strength_Bolt_Inspection_2022.jpg|center|624px]]
+======712.1.5.4.2.1 Bolt Type======
 =====712.1.5.4.3 Step 3, Rotational Capacity=====

Hoskir: /* 712.1.5.4.3 Step 3, Rotational Capacity */ updated per revision request 3523

2022-11-16T15:35:21Z

712.1.5.4.3 Step 3, Rotational Capacity: updated per revision request 3523

← Older revision		Revision as of 10:35, 16 November 2022
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	\|align="center"\|R3\|\| \|\| \|\| \|\| align="center"\|>\|\| \|\|		\|align="center"\|R3\|\| \|\| \|\| \|\| align="center"\|>\|\| \|\|
	\|-		\|-
	\|align="left" style="background:white" colspan="7"\|20% Torque Formula (T = 0.~~20P x Dia./12~~), T in ft-lbs.~~, P in lbs., Bolt Dia. in inches~~		\|align="left" style="background:white" colspan="7"\|20% Torque Formula (T = 0.20T), T in ft-lbs.
	\|-		\|-
	\|align="left" style="background:white" colspan="7"\|Torque Formula (T=0.25P x Dia./12), T in ft-lbs., P in lbs., Bolt Dia. in inches		\|align="left" style="background:white" colspan="7"\|Torque Formula (T=0.25P x Dia./12), T in ft-lbs., P in lbs., Bolt Dia. in inches
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	\|align="center"\|R3\|\| \|\|align="center"\|< \|\| \|\|		\|align="center"\|R3\|\| \|\|align="center"\|< \|\| \|\|
	\|-		\|-
	\|align="left" style="background:white" colspan="5"\|(Inspection Torque formula = 0.95 x Gauged Tension Reading x Bolt Dia. / 12; Bolt Dia. in inches)		\|align="left" style="background:white" colspan="5"\|(Inspection Torque formula = 0.95 x 0.25 x Gauged Tension Reading x Bolt Dia. / 12; Bolt Dia. in inches)
	\|}		\|}
	</center>		</center>

Hoskir: /* 712.1.5.4.5.3 Load Indicating Bolt Method, Sec 712.7.7 */ changes per revision request 3523

2022-11-16T14:50:26Z

712.1.5.4.5.3 Load Indicating Bolt Method, Sec 712.7.7: changes per revision request 3523

← Older revision		Revision as of 09:50, 16 November 2022
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	'''Day-to-Day Verification'''		'''Day-to-Day Verification'''

	Since the machine will shear the bolt off at the specified tension, the biggest piece to verify is done during the Rotational Capacity Test. Once that is done, the inspector just needs to ensure that the contractor is following the correct tightening procedure shown in Sec 712.7.7. Ensure that all plies are in contract when snug tight and that bolt hardware is clean and well lubricated. The QA Inspector should also perform checks of at least 10% of the fastener assemblies with a torque wrench to verify the fastener is tight using the Inspection Torque value (0.95 x highest gauged tension from RoCap Test x bolt diameter in inches / 12). If bolt issues are discovered, more bolts may need to be checked.		Since the machine will shear the bolt off at the specified tension, the biggest piece to verify is done during the Rotational Capacity Test. Once that is done, the inspector just needs to ensure that the contractor is following the correct tightening procedure shown in Sec 712.7.7. Ensure that all plies are in contract when snug tight and that bolt hardware is clean and well lubricated. The QA Inspector should also perform checks of at least 10% of the fastener assemblies with a torque wrench to verify the fastener is tight using the Inspection Torque value (0.95 x 0.25 x highest gauged tension from RoCap Test x bolt diameter in inches / 12). If bolt issues are discovered, more bolts may need to be checked.

	===712.1.6 High Strength Anchor Bolts===		===712.1.6 High Strength Anchor Bolts===

Hoskir: /* 712.1.5.4.3 Step 3, Rotational Capacity */ updated long and short bolt test form links

2022-11-03T15:16:49Z

712.1.5.4.3 Step 3, Rotational Capacity: updated long and short bolt test form links

← Older revision		Revision as of 10:16, 3 November 2022
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	There is not a way to test tension once the bolt has been tightened. The Rotational Capacity Test is a way to verify not only that the bolts are in good condition, but also that they have not been impacted by field conditions. The test will require two components. One component is to visually inspect the bolts and record the results on the form provided in eProjects. The second component is to run tests on the three bolts in the field using a Skidmore-Wilhelm Bolt tension measuring device and a torque wrench. Both the Skidmore and torque wrench must have a calibration performed on it within the previous year from the manufacturer or a test lab. There must be a sticker on it, as well as all supporting documentation to show it has been calibrated.		There is not a way to test tension once the bolt has been tightened. The Rotational Capacity Test is a way to verify not only that the bolts are in good condition, but also that they have not been impacted by field conditions. The test will require two components. One component is to visually inspect the bolts and record the results on the form provided in eProjects. The second component is to run tests on the three bolts in the field using a Skidmore-Wilhelm Bolt tension measuring device and a torque wrench. Both the Skidmore and torque wrench must have a calibration performed on it within the previous year from the manufacturer or a test lab. There must be a sticker on it, as well as all supporting documentation to show it has been calibrated.

	[~~[media~~:~~RoCap Test Form Long Bolts 2022~~.pdf\|RoCap Test Form Long Bolts]] are shown in Table 712.1.5.4.3.1 and Table 712.1.5.4.3.3, [~~[media~~:~~RoCap Test Form Short Bolts 2022~~.pdf\|RoCap Test Form Short Bolts]] are shown in Table 712.1.5.4.3.2. These forms will assist in obtaining all the required information for the testing methods allowed by MoDOT.		[https://epg.modot.org/forms/CM/RoCap_Test_Form_Long_Bolts.pdf RoCap Test Form Long Bolts] are shown in Table 712.1.5.4.3.1 and Table 712.1.5.4.3.3, [https://epg.modot.org/forms/CM/RoCap_Test_Form_Short_Bolts.pdf RoCap Test Form Short Bolts] are shown in Table 712.1.5.4.3.2. These forms will assist in obtaining all the required information for the testing methods allowed by MoDOT.

	Table 712.1.5.4.3.1 and Table 712.1.5.4.3.2 is to be used when the Calibrated Wrench (Sec 712.7.5) or Turn-Of-Nut (Sec 712.7.6) Methods are used. By running the calculations in the spec book to verify the bolts, the values needed for the equipment in the field will also be determined. The entire test will need to be completed to verify that the bolt is good for use in the field.		Table 712.1.5.4.3.1 and Table 712.1.5.4.3.2 is to be used when the Calibrated Wrench (Sec 712.7.5) or Turn-Of-Nut (Sec 712.7.6) Methods are used. By running the calculations in the spec book to verify the bolts, the values needed for the equipment in the field will also be determined. The entire test will need to be completed to verify that the bolt is good for use in the field.

Hoskir: /* 712.1.5.4.2 Step 2, Inspection Type Selection */ - added new flowchart image

2022-10-20T19:53:33Z

712.1.5.4.2 Step 2, Inspection Type Selection: - added new flowchart image

← Older revision		Revision as of 14:53, 20 October 2022
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	Prior to going into the field, determine the bolt type and the inspection method that will be used. This will allow you to know the equipment needed and discuss test procedures with the contractor. For some test methods, the contractor will provide the calibrated equipment to check the bolts.		Prior to going into the field, determine the bolt type and the inspection method that will be used. This will allow you to know the equipment needed and discuss test procedures with the contractor. For some test methods, the contractor will provide the calibrated equipment to check the bolts.

	[[image:~~712.1.5.4.2 flowchart~~.jpg\|center\|~~800px~~]]		[[image:Flowchart-High_Strength_Bolt_Inspection_2022.jpg\|center\|624px]]

	=====712.1.5.4.3 Step 3, Rotational Capacity=====		=====712.1.5.4.3 Step 3, Rotational Capacity=====

Hoskir: /* 712.1.5.4.3 Step 3, Rotational Capacity */ - added 2 test form links for long and short bolts and updated the test bolt image

2022-10-20T19:14:52Z

712.1.5.4.3 Step 3, Rotational Capacity: - added 2 test form links for long and short bolts and updated the test bolt image

← Older revision		Revision as of 14:14, 20 October 2022
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	There is not a way to test tension once the bolt has been tightened. The Rotational Capacity Test is a way to verify not only that the bolts are in good condition, but also that they have not been impacted by field conditions. The test will require two components. One component is to visually inspect the bolts and record the results on the form provided in eProjects. The second component is to run tests on the three bolts in the field using a Skidmore-Wilhelm Bolt tension measuring device and a torque wrench. Both the Skidmore and torque wrench must have a calibration performed on it within the previous year from the manufacturer or a test lab. There must be a sticker on it, as well as all supporting documentation to show it has been calibrated.		There is not a way to test tension once the bolt has been tightened. The Rotational Capacity Test is a way to verify not only that the bolts are in good condition, but also that they have not been impacted by field conditions. The test will require two components. One component is to visually inspect the bolts and record the results on the form provided in eProjects. The second component is to run tests on the three bolts in the field using a Skidmore-Wilhelm Bolt tension measuring device and a torque wrench. Both the Skidmore and torque wrench must have a calibration performed on it within the previous year from the manufacturer or a test lab. There must be a sticker on it, as well as all supporting documentation to show it has been calibrated.

	RoCap Test Form Long Bolts are shown in Table 712.1.5.4.3.1 and Table 712.1.5.4.3.3, RoCap Test Form Short Bolts are shown in Table 712.1.5.4.3.2. These forms will assist in obtaining all the required information for the testing methods allowed by MoDOT.		[[media:RoCap Test Form Long Bolts 2022.pdf\|RoCap Test Form Long Bolts]] are shown in Table 712.1.5.4.3.1 and Table 712.1.5.4.3.3, [[media:RoCap Test Form Short Bolts 2022.pdf\|RoCap Test Form Short Bolts]] are shown in Table 712.1.5.4.3.2. These forms will assist in obtaining all the required information for the testing methods allowed by MoDOT.

	Table 712.1.5.4.3.1 and Table 712.1.5.4.3.2 is to be used when the Calibrated Wrench (Sec 712.7.5) or Turn-Of-Nut (Sec 712.7.6) Methods are used. By running the calculations in the spec book to verify the bolts, the values needed for the equipment in the field will also be determined. The entire test will need to be completed to verify that the bolt is good for use in the field.		Table 712.1.5.4.3.1 and Table 712.1.5.4.3.2 is to be used when the Calibrated Wrench (Sec 712.7.5) or Turn-Of-Nut (Sec 712.7.6) Methods are used. By running the calculations in the spec book to verify the bolts, the values needed for the equipment in the field will also be determined. The entire test will need to be completed to verify that the bolt is good for use in the field.
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	:2. Place the bolt into the Skidmore and set it to snug tight (10% of installation tension in Sec 712.7.3 Bolt Tension Table). This is to be done with a spud wrench. The contractor should add washers until three to five threads are in the grip, if less than 3 threads, the test will fail. Mark reference rotation marks on the fastener assembly element turned and on face plate of Skidmore. (Mark starting point on bolt end, nut and calibrator face with straight line.) Note that some short bolts may require the shortbolt setup for the Skidmore.		:2. Place the bolt into the Skidmore and set it to snug tight (10% of installation tension in Sec 712.7.3 Bolt Tension Table). This is to be done with a spud wrench. The contractor should add washers until three to five threads are in the grip, if less than 3 threads, the test will fail. Mark reference rotation marks on the fastener assembly element turned and on face plate of Skidmore. (Mark starting point on bolt end, nut and calibrator face with straight line.) Note that some short bolts may require the shortbolt setup for the Skidmore.
	:3. Turn the fastener with the wrench to be used for the daily testing in the field to the installation minimum tension in Sec 712.7.3 Bolt Tension Table. Stop and record the torque at that moment from the torque wrench and record the tension on the Skidmore. Verify the recorded torque does not exceed the maximum allowable torque (refer to Sec 1080.2.5.4.6 formula). Verify that the amount the nut has turned going to the minimum bolt tension is less than the specified nut rotation in Sec 712.7.6 Nut Rotation from Snug Tight Condition table.		:3. Turn the fastener with the wrench to be used for the daily testing in the field to the installation minimum tension in Sec 712.7.3 Bolt Tension Table. Stop and record the torque at that moment from the torque wrench and record the tension on the Skidmore. Verify the recorded torque does not exceed the maximum allowable torque (refer to Sec 1080.2.5.4.6 formula). Verify that the amount the nut has turned going to the minimum bolt tension is less than the specified nut rotation in Sec 712.7.6 Nut Rotation from Snug Tight Condition table.
	[[image:712.1.5.4.5.~~3.jpg~~\|right\|~~175px~~]]		[[image:712.1.5.4.3_Bolt-test_2022.png\|right\|280px]]
	:4. Further turn the bolt according to Sec 1080.2.5.4.4. This rotation is measured from the initial match mark made in step 2. . Record the tension achieved and then compare the tension at this point to the Turn Test Tension in Sec 1080.2.5.4.5 Required Bolt Tensions Table. The tension must be equal or greater than Turn Test Tension.		:4. Further turn the bolt according to Sec 1080.2.5.4.4. This rotation is measured from the initial match mark made in step 2. . Record the tension achieved and then compare the tension at this point to the Turn Test Tension in Sec 1080.2.5.4.5 Required Bolt Tensions Table. The tension must be equal or greater than Turn Test Tension.
	:5. Remove the bolt and inspect for damage and record it on our form. Turn the nut by hand on the bolt threads to the position it was in during the test. Not being able to turn the nut by hand is thread failure.		:5. Remove the bolt and inspect for damage and record it on our form. Turn the nut by hand on the bolt threads to the position it was in during the test. Not being able to turn the nut by hand is thread failure.
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	:1. Measure the ratio of diameter/length of the bolt and refer to Sec 712.7.6 on the installation rotation.		:1. Measure the ratio of diameter/length of the bolt and refer to Sec 712.7.6 on the installation rotation.
	:2. Place the bolt into the steel plate. The contractor should add washers until three to five threads are in the grip, if less than 3 threads the test will fail. Set it to snug tight (Not exceed 20% of maximum torque at first rotation). Maximum torque at first rotation is equal to Turn Test Tension, Sec 1080.2.5.4.5 and applying that tension to the torque formula in Sec 1080.2.5.4.6. This is to be done with a measuring torque wrench.		:2. Place the bolt into the steel plate. The contractor should add washers until three to five threads are in the grip, if less than 3 threads the test will fail. Set it to snug tight (Not exceed 20% of maximum torque at first rotation). Maximum torque at first rotation is equal to Turn Test Tension, Sec 1080.2.5.4.5 and applying that tension to the torque formula in Sec 1080.2.5.4.6. This is to be done with a measuring torque wrench.
	[[image:712.1.5.4.5.~~3.jpg~~\|right\|~~175px~~]]		[[image:712.1.5.4.3_Bolt-test_2022.png\|right\|280px]]
	:3. Mark reference rotation marks on the fastener assembly element turned and on face of steel plate. (Mark starting point on bolt end, nut and steel plate face with straight line.)		:3. Mark reference rotation marks on the fastener assembly element turned and on face of steel plate. (Mark starting point on bolt end, nut and steel plate face with straight line.)
	:4. Turn the fastener with the torque wrench to be used for the daily testing in the field to the rotation shown in Sec 712.7.6 Nut Rotation from Snug Tight Condition Table. Once the first target rotation has been reached, stop and record the torque at that moment from the torque wrench. Verify the recorded torque does not exceed the maximum torque. Maximum torque at first rotation is turn test tension, Sec 1080.2.5.4.5 with torque formula Sec 1080.2.5.4.6, as shown in step 2.		:4. Turn the fastener with the torque wrench to be used for the daily testing in the field to the rotation shown in Sec 712.7.6 Nut Rotation from Snug Tight Condition Table. Once the first target rotation has been reached, stop and record the torque at that moment from the torque wrench. Verify the recorded torque does not exceed the maximum torque. Maximum torque at first rotation is turn test tension, Sec 1080.2.5.4.5 with torque formula Sec 1080.2.5.4.6, as shown in step 2.