170 COLLAPSE OF TEXAS TOWER NO. 4 



Mr. Kendall. The repair work, involving the installation of the 

 collar, was not holding, as I understand it. 



Mr. Crockett. Not at that particular time. "We also found that 

 the Dardelet keeper plate that we had found on B caisson was missing 

 on A caisson. 



Mr. Kendall. Wliat is the keeper plate ? 



Mr. Crockett. The keeper plate was a field installation, I am given 

 to understand, to hold the Dardelet bolts in place, obviously. It was 

 a steel plate some three-eighths of an inch thick covering the entire 

 area, the Dardelet area, secured by half -inch bolts to the caisson. Why 

 this was installed ? I have never seen it on any drawing and I do not 

 believe tliere is any specific note in the design of this. I believe it was 

 a field installation. 



Mr. Kendall. Were the collars on both the A and B legs moving 

 vertically on the leg? 



Mr. Crockett. The B caisson collar was found to be firm, without 

 motion. The A caisson collar was found to be in vertical motion. 



Senator Stennis. May I interrupt there? Was it in this Dardelet 

 bolt connection and collar that you found this 1 inch or more play ? 



Mr. Crockett. It had to be through that section, sir. This collar 

 on A attached to the A caisson here [indicating] had vertical motion 

 as much as an inch on each side. That would make a motion of about 

 2 inches. 



Senator Stennis. The brace where it fastened ? 



Mr. Crocketf. The whole collar structure. 



Senator Stennis. The brace is attached to the collar? 



Mr. Crockett. Yes. 



Senator Stennis. So it had a motion of an inch up and an inch 

 down, to make a total of 2 inches ? 



Mr. Crockett. Yes, sir. 



Some of these Dardelet bolts were found to be missing at this time. 

 This was also at the time we found the Dardelet bolts were of not true 

 size according to specifications. NoiTnally, in a thing of this nature, 

 we examine the specifications prior to a survey, and we found that 

 the holes were oversize and that the Dardelet connection had not been 

 installed according to the drawing. This was a matter of record. 



Mr. Kendall. This brace you are talking about was on the AB side 

 at the minus 25-foot level ? 



Mr. Crockett. This brace I am talking about was right there [in- 

 dicating] on the A caisson at the minus 75-foot level. The motion ap- 

 pears at the top and bottom. 



Mr. Kendall. Well, did that indicate that that brace was not func- 

 tioning properly ? 



Mr. Crockett. It was functioning, but not properly. It was still 

 intact and still holding, but it did have motion in it adverse to the de- 

 sign. Tlie design was to have it firm. This is why we were there, 

 to endeavor to draw this firm. 



Mr. Kendall. "V^Hiat was done as a result of your inspection or your 

 report ? 



Mr. Crockett. We torqued-the collar holding bolts on both sides up 

 to 1,300 foot-pounds, and in so doing, we stilled the vertical motion 

 sucli that at the time we left this connection, it was finn. However, 

 at this time, we did not deal with the Dardelet bolts. 



