Subject No. 11. Outline of Work

The Committee recommends reassignment of the following subjects in the form given:

1. Study the Manual and submit proposed revisions thereof.

2. Submit final specifications for the erection of steel railway bridges.

4. Make final report on the classification of bridges.

5. Continue study and submit report, if practicable, on specifications for turntables and turntable pits.

6. Continue study and report on specifications for steel highway bridges.

7. Continue study and report on column tests.

8. Continue study and report on the electric welding of connections in steel structures.

9. Collaborate with Committee X on rules for lighting and a uniform code of regulations and signals for the operation of drawbridges. 11. Recommend a carefully considered outline of work for the ensuing year.

The following new subjects are recommended:

1. Study the economics of maintenance of railway bridges, including equipment for that purpose.

2. Make rules for field inspection of existing bridges.

3. Make tests and investigations of I-beams connected in groups by diaphragms and bracing, from which conclusions may be drawn, and good practice in designing established.

4. Make tests and study the behavior of bridge pins.

Respectfully submitted,

ÇOMMITTEE ON IRON AND STEEL STRUCTURES,

O. E. SELBY, Chairman.

Appendix A

GENERAL SPECIFICATIONS FOR THE ERECTION OF STEEL RAILWAY BRIDGES

For Fixed Spans Less Than 300 Feet in Length

20 and 21 Removal of Old Structure and Falsework.

Information to Be Given Bidders

1. A copy of the agreement form.....

Article 1

2. A set of general and design plans of the proposed structure, with estimated quantities

5

3. A plan or description of the structure to be replaced, with estimated quantities

2

4. A statement showing the name of, and distance to, the station where the material will be delivered, the nature and amount of traffic, and the side-track and storage facilities to be furnished to the Contractor

5. What transportation will be furnished?

6. What work train service will be furnished?.

6

7. Will conductor or pilot service be furnished?.

8. What rolling equipment will be furnished?...

.25

.23

.24

8

.17

.17

.20

9. Shall the Contractor furnish and place the falsework?.. 10. Shall the Contractor frame and place the timber deck, etc?. 11. Shall the Contractor place the track and rails and tie-plates?. 12. Will the old structure be scrapped or re-erected?......... 13. Shall the Contractor load the falsework material and material from old structure on cars for shipment or pile it at the site?.......20 14. The probable date when the structure will be ready for erection. 15. Shall the bidder furnish a brief description of the method of erection he proposes to follow?

16. Shall the field painting be done by the Contractor?...

19

GENERAL SPECIFICATIONS FOR THE ERECTION OF STEEL RAILWAY BRIDGES

For Fixed Spans Less Than 300 Feet in Length

Definitions of Terms.

1922

1. The term "Engineer" refers to the Chief Engineer of the Company or his subordinates in authority. The term "Inspector" refers to the Inspector or Inspectors representing the Company. The term "Company" refers to the Railway Company or Railroad Company party to the agreement. The term "Contractor" refers to the erection contractor party to the agreement.

Work to Be Done.

2. The Contractor shall erect the metal work, make all connections and adjustments, remove the old structures and falsework and do all work required to complete the bridge or bridges, as covered by the agreement, in accordance with the plans and these specifications.

Drawings to Govern.

3. Where the drawings and the specifications differ, the drawings shall govern.

Plant.

4. The Contractor shall provide all tools, machinery, and appliances, including drift pins and fitting up bolts, necessary for the expeditious handling of the work. The Contractor shall protect the Company against claims on account of patented devices or parts used by him on the work. Plans.

5. The Company will furnish complete detail plans for the structure or structures to be erected, including shop details, camber diagram, erection diagrams, match-marking diagrams, list of field rivets and bolts, and copy of shipping statements showing a full list of parts and weights. Materials.

6. The Contractor shall receive, f.o.b. cars, at the siding to be designated in the information to be given bidders, all materials entering into the finished structure.

Handling and Storing Materials.

7. The Contractor shall unload material promptly upon delivery, otherwise he shall be responsible for demurrage charges. Stored material shall be piled securely outside the tracks, and no material shall be placed closer than six feet to the nearest rail. Material shall be placed on skids, above the ground, be kept clean and properly drained. Girders and beams shall be placed upright and shored. Long members, such as columns and

Handling and Storing Materials.

chords, shall be placed on skids near enough together to prevent injury by deflection. The Contractor shall check all material turned over to him against shipping lists and report promptly in writing any shortage or injury discovered. He will be held responsible for the loss of any material while in his care, or for any damage resulting from his work. Falsework.

8. Unless otherwise provided, the Contractor shall prepare and submit to the Engineer for approval, plans for falsework or for changes in the existing structure necessary for maintaining traffic. The falsework shall be properly designed and substantially constructed and maintained for the loads which will come upon it. Approval of the Contractor's plans shall not be considered as relieving the Contractor of any responsibility. Temporary structures or falsework placed by the Company, if suitable, may be used by the Contractor.

Masonry.

9. The Company will construct the masonry to correct lines and elevations, and will establish the lines and elevations required by the Contractor for setting the steel.

Bearings and Anchorage.

10. Bed plates, bolsters, and shoes shall be set level in exact position. They shall be given full and even bearing by setting them on a layer of Portland cement mortar or dry cement, or by tightly ramming in rust cement after blocking them accurately in position, as directed by the Engineer.

11. The Contractor shall drill the holes and set the anchor bolts, except where the bolts are built into the masonry. The bolts shall be set accurately and fixed with Portland cement grout completely filling the holes.

Methods and Equipment.

12. Before starting work, the Contractor shall advise the Engineer fully as to the method he proposes to follow, and the amount and character of equipment he proposes to use, which shall be subject to the approval of the Engineer. The approval of the Engineer shall not be considered as relieving the Contractor of the responsibility for the safety of his method or equipment or from carrying out the work in full accordance with the plans and specifications. No work shall be done without the sanction of the Engineer.

Assembling Steel.

13. All parts shall be accurately assembled as shown on the plans and any match-marks carefully followed. The material shall be carefully handled so that no parts will be broken or damaged. Hammering which will injure or distort the work will not be permitted. Bearing surfaces and surfaces to be in permanent contact shall be cleaned just before the members are assembled. Unless erected by the cantilever method, truss spans shall be erected on blocking so placed as to give the trusses proper