Ports "Fixes transit tube barricade spam"

code/game/objects/structures/transit_tubes/transit_tube_construction.dm

@@ -15,6 +15,15 @@
 	var/flipped_build_type
 	var/base_icon
 
+/obj/structure/c_transit_tube/proc/can_wrench_in_loc(mob/user)
+	var/turf/source_turf = get_turf(loc)
+	var/existing_tubes = 0
+	for(var/obj/structure/transit_tube/tube in source_turf)
+		existing_tubes++
+		if(existing_tubes >= 2)
+			to_chat(user, "<span class='warning'>You cannot wrench any more transit tubes!</span>")
+			return FALSE
+	return TRUE
 
 /obj/structure/c_transit_tube/ComponentInitialize()
 	. = ..()
@@ -32,9 +41,11 @@
 		icon_state = "[base_icon][flipped]"
 
 /obj/structure/c_transit_tube/wrench_act(mob/living/user, obj/item/I)
+	if(!can_wrench_in_loc(user))
+		return
 	to_chat(user, "<span class='notice'>You start attaching the [name]...</span>")
 	add_fingerprint(user)
-	if(I.use_tool(src, user, time_to_unwrench, volume=50))
+	if(I.use_tool(src, user, time_to_unwrench, volume=50, extra_checks=CALLBACK(src, .proc/can_wrench_in_loc, user)))
 		to_chat(user, "<span class='notice'>You attach the [name].</span>")
 		var/obj/structure/transit_tube/R = new build_type(loc, dir)
 		transfer_fingerprints_to(R)