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You can do it using this code as the custom calculation script of the text field:
var v1 = Number(this.getField("Text11").valueAsString);
var v2 = Number(this.getField("Text19").valueAsString);
var v3 = Number(this.getField("Text27").valueAsString);
event.target.readonly = (v1>=1 || v2>=1 || v3>=1);
Thank you! That has worked!