This seems to work:
SELECT 'disable trigger ' + USER_NAME(trig.schema_id) + '.' + trig.name + ' on ' + USER_NAME(tab.schema_id) + '.' + OBJECT_NAME(trig.parent_object_id) + char(10) + 'go' FROM sys.objects trig INNER JOIN sys.objects tab ON trig.parent_object_id = tab.object_id WHERE trig.type = 'TR'
It generates sql like this:
disable trigger dbo.tr_AfterUpdate on dbo.BigTable go disable trigger dbo.tr_BeforeUpdate on dbo.BigTable go