SELECT T1.id ,  T1.name FROM architect AS T1 JOIN bridge AS T2 ON T1.id  =  T2.architect_id GROUP BY T1.id HAVING count(*)  >=  3
What are the ids and names of the architects who built at least 3 bridges ?
[Schema (values) (types)]: | architecture |  architect : id (text) , name (text) , nationality (text) , gender (text) | bridge : architect_id (text) , id (text) , name (text) , location (text) , length_meters (text) , length_feet (number) | mill : architect_id (text) , id (text) , location (text) , name (text) , type (text) , built_year (number) , notes (number);