Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools by Webb Walter Loring 1863-

Author:Webb, Walter Loring, 1863- [from old catalog]
Language: eng
Format: epub
Tags: Railroads
Publisher: New York, John Wiley & sons, inc.; [etc., etc.]
Published: 1917-03-25T05:00:00+00:00

Fio. 129.—SpiXE-DBiviNa

Fia. 130.— Screw Spike, D. L. A. W. R. R.

by Mr. G..). Ray, Chief Engineer, to the A. R. E. A., the following facts and conclusions are deduced:

1. The use of screw spikes, in conjunction with suitable tie-plates, is almost a necessity in order to fully utilize the durability of a treated tie. A treated tie is seldom removed on account of decay in the body of the tie. Its destruction is generally due to " spike-killing," rail cutting, or to the decay which comes immediately after mechanical injury to the wood under the rail. Screw spikes and tie-plates largely prevent this mechanical injury.

2. " As a rule, with woods which it will pay to treat, the poorer the quality of the timber the more elaborate and expensive the fastening must be if the mechanical life of the tie is made to approach the life of the treated timber."

3. " Tie-plates should be used on all ties where screw spikes are used."

4. " Four holes should be provided for screw spikes, so that two extra holes will be available if needed."

5. " The size of screw spikes and the design of the thread should be carefully considered before a screw spike is adopted. Thereafter no changes should be made; otherwise the new screw spikes cannot be used in old holes without damaging the wood fiber."

6. " The screw-spike head should have tapering sides to prevent turning in the wrench socket after the size of the head has been diminished by rust."

7. "When screw spikes are fully seated, no further strain should be put on them, as this will tend to destroy the threads in the wood or injure the spikes."

8. "All ties should be bored at the treating plant before treatment. This can be done while the ties are being adzed, and not only insures that the holes are bored sufficiently deep, but provides for good treatment of all wood adjacent to the spike holes."

9. " Where the ties are bored before treatment, the track must be to proper gauge before the ties can be placed."

10. " The holes for sorew spikes should be of proper dimensions for the class of wood used, with due regard to the size of screw spike used,"

11. "A limited number of holes can be bored with one bit, after which its size will diminish so as to make it unfit for a hole of a given size." [The paper nowhere makes any statement as to the size of the bored hole in comparison with the diameter of the screw. The bored hole should have about the same diameter as the diameter of the screw at the base of the screw thread, but the hardness of the wood requires some variation, since, if the hole is too small, it will be inipossible to turn the screw. The exact diameter must be determined for each kind of wood and must be strictly maintained.]

12. " Holes should be bored somewhat deeper than the length of the screw spike.

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