Can Git push only first parent history commits?

        The commit history is: 
        origin/master
              Commit1..Commit2..Commit3(T1 branch). 
         
        I want to combined Commit1, Commit2 and Commit3 to one commit_X
and push to origin master and keep old T1 branch history.  So I can't
use rebase.  T1 branch history will be lost after rebase. 
        So I create T2 branch at origin/master:
	
        origin/master
              Commit1..Commit2..Commit3(T1 branch). 
	  T2 (branch).

        Then I use "git merge --no-ff --log T1" merge T1 to T2.  
        So 
	  origin/master
              	+--Commit1..Commit2..Commit3(T1 branch). +

	
+----------------------------------------------------------------+--Comm
itX(T2 branch).

       But when I push T2 to origin master, Commit1 ,2, 3 also pushed.
I expect there are only CommitX at origin master branch. 
       How can I do?
 
best regards
Frank Li