Cops Describe Wild Struggle To Detain Lineman

It took 3 police officers to detain massive NFL lineman Chad Wheeler during a bloody domestic violence rampage at his GF's apartment ... and cops described the battle like they were trying to subdue a bear.

According to multiple police reports, obtained by TMZ Sports, the Kent P.D. officers got a heads up that the suspect in the Jan. 22 incident was Seattle Seahawks OL Chad Wheeler, who was listed at 6'7", 315 pounds.

When they arrived at the scene and saw Chad's GF was badly injured, they said they raced to subdue the 27-year-old ... despite the fact he fights off bigger and stronger men for a living.

One cop said in the docs, "When I grabbed ahold of Chad, I could tell that he was very solid…