Dwarghar Stoneblood:
05:46, Today: Dwarghar Stoneblood rolled 3 using 1d6. Trap
There's some sort of large iron clamp among the junk, possibly for keeping minecarts and other large equipment stationary for repair. With some assistance, You position it on its side, so it rests on the rest of the debris blocking the door. You could probably catch a bear with that setup.
But of course, that's probably not a bear.