174 COLLAPSE OF TEXAS TOWER NO. 4 



The period of inspection May 22, 1959, to June 13, 1959, excluding May 26th 

 to June 3d, Marine Contractors' divers watched the procedures and progress 

 of Stears M.K. divers installing the Hi Tensile T-bolt connection on caissons 

 A and B Texas tower 4. 



All work performed by the installing divers was accomplished in a good 

 workmanlike manner, and in accordance with standards set up by the contract- 

 ing oflBcer. 



The T-bolt connection was completely installed and all nuts were torqued to 

 1,300 ft.-pounds. The collar-holding bolts were torqued to 1,600 pounds. The 

 installation is complete on caissons A and B. 



The T-bolt connection tended to conform the collar to the caissons in a very 

 satisfactory manner. However the vertical motion of the collar and cross 

 brace is now reduced to zero. 



Considerable increase in the marine growth was noticeable since the dates of 

 last observations in September 1958. 



Submitted with this report are three sets of pictures taken of the operation 

 and are self-explanatory. 

 Yours very truly. 



Marine Contractors Co., Inc., 

 Alan D. Crockett. 



Mr. Kendall. Go ahead, sir. 



Mr. Crockett. This particular phase of construction and repair 

 was done in a good workmanlike manner, as so stated here : 



All work performed by the installing divers was accomplished in a good 

 workmanlike manner, and in accordance with standards set up by the con- 

 tracting officer. 



The T-bolt connection was completely installed and all nuts were torqued to 

 1,300 foot-pounds. The collar-holding bolts were torqued to 1,600 pounds. The 

 installation is complete on Caissons A and B. 



Mr. Kendall. At that time, was any consideration given to a pos- 

 sible deterioration in the pin connections? 



Mr. Crockeit. I think not, sir. However, we did find in the orig- 

 inal survey that the pin at the connection of the diagonal brace from 

 B caisson to the horizontal brace between A and B caissons at the 

 minus 25-foot level was found to be slightly withdrawn. It had lost 

 its taper pin and holding collar. 



Mr. Kendall. This is not an increase in the tolerance, but a with- 

 drawing of the pin ? 



Mr. Crockett. A withdrawing of the pin. 



Mr. Kendall. This was at the time of your original inspection ? 



Mr. Crockett. Yes, sir. 



Mr. Kendall. On your subsequent inspection, was that limited to 

 making a determination of whether or not Steers had properly formed 

 the repair work ? 



ISIr. Crockett. At the time of June 26, 19.59, when we inspected the 

 repair, the pin had been withdrawn and replaced, and new keepers 

 installed. It was then intact. 



Mr. KJENDALL. Did you find anything of significance structurally 

 wrong with the tower at that time ? 



inspection revealed NOTHING STRUCTURALLY WRONG AT THIS TIME 



Mr. Crockett. I would say not. We did not find anything struc- 

 turally wrong at that particular time. 



Mr. EIendall. Did you thereafter make another underwater survey, 

 and if so, when ? 



Mr. Crockett. I did. I made a survey. The report is dated 

 February 16, 1960. 



