This is not repairable.

Since you have no backups the best you'll be able to do is script out all the objects (some may fail to script due to the corruption), export what data will export (anything that's damaged will fail to export, so you'll probably have to do this in pieces) and recreate the database the best you can.

If it is just that one page that's damaged (its an allocation page) then maybe all your data will export correctly, but there's an 8000 page chunk of your database that can't be checked (because of the damaged page) and there may be more corruption within that section that will cause further errors.