DECLARE @SQL NVARCHAR(MAX) = N'';

SELECT @SQL += N'
ALTER TABLE ' + OBJECT_NAME(PARENT_OBJECT_ID) + ' DROP CONSTRAINT ' + OBJECT_NAME(OBJECT_ID) + ';' 
FROM SYS.OBJECTS
WHERE TYPE_DESC LIKE '%CONSTRAINT' AND OBJECT_NAME(PARENT_OBJECT_ID) = 'Your_TABLE';

PRINT @SQL