I workout in my college gym, and the gym is the shittest gym I've ever known...

the leg press/hack squat machine broke last month maybe due to heavy load (I loaded only 840lbs... WTF

)
and there's no quads machine or squat rack, we only got one smith machine and everyone wants to use it to train
chest....
so I train quads with
1. two 130lb dumbbells squat (the heavist in my gym)

2.some barbell hack squat

any advice? thanks...