Lock-pin and collar fastening system : final report.

Brooks, Eric W.; Laylor, Martin H,

i

Lock-pin and collar fastening system : final report.

1997-02-01
By Brooks, Eric W. ; Laylor, Martin H,

File Language:

English

Details

Creators:

Brooks, Eric W. ; Laylor, Martin H,
Corporate Creators:

Oregon. Dept. of Transportation. Research Unit
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:
Publication/ Report Number:

EF-OR-RD-92-05
Resource Type:

Tech Report
Geographical Coverage:

Portland (Oregon)
Corporate Publisher:

Oregon. Dept. of Transportation. Research Unit
Abstract:

In 1993, a steel girder I-beam deck was extended to cross a new on-ramp at the Marquam Bridge Interchange in Portland, Oregon. The steel members of this new structure were fastened together using the lock-pin and collar fastening system. ; These fasteners are quicker and easier to install than the standard threaded ASM 325 bolts. While the lock-pin are about the same length and strength as the standard bolts, the collars are not threaded but rather are swaged onto the lock-pin by a special hydraulic installation tool. Once the collar is swaged on, no additional tightening with a torque wrench is required. A simple sound test by pinging it with a hammer verifies the tightness of fit. While reports of nuts working loose on standard bolts are common, the lock-pin collar fasteners remained tight after three years of service. ; Costs can be reduced with less labor by using this system. Since the lock-pins do not need to be torqued, the second and third tightness checks are eliminated. Material costs are about the same when torque indicator washers are used with standard bolts.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/22902/dot_22902_DS1.pdf
File Type:

[PDF - 689.54 KB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:483b3170d8ca85255a94d7d53ebc6f133fd6653abd6edbe689b7da63ea6ca8768469ee9db234a9aa1086f7029adf016b26d5b1b7b20a64470b5601f2d2779f12

File Language:

English

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