The phrase "about to walk through" is correct and usable in written English.
It can be used to indicate that someone is on the verge of entering or passing through a particular place or situation.
Example: "As I stood at the entrance, I felt a rush of excitement, knowing I was about to walk through the doors of my new office."
Alternatives: "on the verge of entering" or "ready to step into".
The man was about to walk through the metal detector, and Mr. Pategas heard him ask the party at the other end to hold on for a second.
Outside, a sea of big black cameras and upraised iPhones are aimed at the door that she's about to walk through.
Stewart Home books are written by a collective and we are just about to walk through Bunhill Fields cemetery, last resting place of Blake and Defoe".
Ian Hamilton, that ace writer and recidivist encourager and denouncer of poets, could talk about Matthew Arnold as if the saint of high culture was about to walk through the doors of the Gay Hussar.
By now I was deep into thought and only gradually realized I was about to walk through a heated argument.
At the end of the segment, I wanted out of the studio immediately, got up to walk off the set and was stopped by producers because I was about to walk through the camera as Hannity introduced the next segment.
As an inspector for the Waypoint Real Estate Group, Mr. Hladik takes about 20 minutes to walk through each home, noting worn kitchen cabinets or missing roof tiles.
"A Midsummer Nightmare," an off-season haunted house by the Vortex Theater Company at the Sanford Meisner Theater, requires only about nine minutes to walk through.
The parents-in-law took about two minutes to walk through the place, before ducking out the door with wrinkled noses and strange smiles that probably meant they'll never look at me the same way again.
After asking about our health, he began to walk through his thoughts on my latest research project — and gave me substantial additional work to do, with a pretty short timeline.
So let's all go — we can sit in the back, order big bowls of linguine vongole, and talk excitedly about writing with whoever happens to walk through the door.
