Virtualhost setup for Ruby on Rails application (mod passenger)

I'm trying to install Redmine under apache. The apache server works on a local network.
My apache setup consist on a single virtual host. I can get insto different directories using simply the path corresponding:

http://ip_address/folder_of_the_project_1

How can I setup the virtualhost to make redmine works in this situation?
Here is my current virtualhost setup:

NameVirtualHost *
<VirtualHost *>
    ServerAdmin webmaster@localhost

    DocumentRoot /var/www/
    RailsBaseURI /redmine
    <Directory />
            Options FollowSymLinks
            AllowOverride None
    </Directory>

    <Directory /var/www/>
            Options FollowSymLinks MultiViews
            AllowOverride None
            Order allow,deny
            allow from all
    </Directory>

    <Directory /var/www/redmine/public>                
            Options FollowSymLinks
            AllowOverride None
            Order allow,deny
            Allow from all
    </Directory>

    ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
    <Directory "/usr/lib/cgi-bin">
            AllowOverride None
            Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
            Order allow,deny
            Allow from all
    </Directory>

    ErrorLog /var/log/apache2/error.log

    # Possible values include: debug, info, notice, warn, error, crit,
    # alert, emerg.        
    LogLevel warn

    CustomLog /var/log/apache2/access.log combined
    ServerSignature On

Alias /doc/ "/usr/share/doc/"
<Directory "/usr/share/doc/">
    Options Indexes MultiViews FollowSymLinks
    AllowOverride None
    Order deny,allow
    Deny from all
    Allow from 127.0.0.0/255.0.0.0 ::1/128
</Directory>

Thank you,
Ingo86