This bridge is connected with 2 marine openings, maneuvered on it by hands; each one of them is 32 meter long. It’s columns were constructed by the normal stones surrounded with a layer of the solid lime stone, it’s foundations were carried out through the compressed air way. And it’s opening were designed to carry 40 tones for each .At that time, this bridge was fit to lift the normal carries, it was designed to carry the successive carriages (each weights 6 tones) or lifting a distributed carries weights (400 kg/m2).

A butchering around the bridge ‘s supports were observed .on this behalf the irrigation ministry starts by filling those butchers around the supporting columns and a simple deviation was occurred and some of it’s iron parts were consumed, also two supports were suffered from mortor leading the roads public goods to repair it by filling it with a cement morter from inside & solder lines from outside, and as the traffic increased over the bridge, the expected load increased, as a result bridges and roads public goods started to forbid heavy slow overloaded cars , and after taking all technical preventive and entering traffic movement modification to avoid any sudden dangerous action …it has been decided to build a new bridge to suffice the over loads and increased transportation to suit Cairo’s over population .

On February the fourth year 1932, King Foad the first, put the basic stones for the new bridge as a revival for his father’s memory calling it

( El Khedawy Ismail ) known nowadays as El Tahrir bridge .

The form pointed out all instrument’s’ specifications that are to be used in bridge construction, calculating all ironic parts and all basic needed concrete works for bridge bases and floors, reinforced stakes length’s to build bridge sides, concrete rates according to its use.

The form took all technical specifications established by German, French and English Governments prepared by Engineers’ assemblies then confirmed by the government and became the higher reference for all technical engineering work.

• The form made all needed specifications for the Kaysonat
• Iron thickness and its reinforcement way
• Working room and specified instrument for air pressure and its doubling to work with exchanging unit incase of any break down in the main unit and, security guarantees that are to be open incase of any increase in known pressure and air conditioning within the working room, telephonic connection between working room and engineer supervisor on the diving operation.
• Mechanic instruments needed to transport digging tools from working room to outside.
• Scaffolds and piles needed to dig the vacuum room vertically.
• Filling administration room with concrete after dig finishing and filling the vacuum room with concrete.
• Constructing a reinforced concrete pillow above the vacuum room with a width of 1 meter to grantee distributing the load on the vacuum room regularly.

• The form putted the required specifications in which it pointed out the following :-

• Used granite stones size in condition to be local.
• Constructing the facing with granite in which the stones following each other in succession (header & stretcher) and vice versa in the next bond with a complete continuous connection between Granite stone and inner concrete.
• Stones are to be sculptured carefully according to appeared bent within the drawings and each bond will be carefully controlled on water balance in which will be decided by the direct engineer.
• A concrete layer will be built with a 0.5-meter width to distribute the load on the support regularly.

• The bridge load has been clarified to be of 3 moving locomotives beside each other; each one’s axis is of 3 meters distance from the other one.
• Each locomotive contains heavy drawing machine of 22 tons and 3 cars each one weights 14 tons.
• This is the smallest load established for the British agricultural road bridges according to British Transportation Ministry specifications decided in 1922. This model has been decided when it appeared after the First World War that the British bridges are in need for reinforcement and widening so as to fit for the passing of all heavy drawing machines and other military equipment that did not appear through the war.

• The firm specified that the bridge ironic parts will be painted with 4 layers, the first layer is of Iron Oxide, and will be painted in the factory, the 2nd layer is also of the Iron Oxide but will be painted at the working place, 3rd & 4th layer will painted by a paint clarified by the firm and the chemical laboratory on condition that the two layers are of different colors to enable the supervising engineer for bridge maintenance futurity to know paint condition and its effected degree with air , time and other conditions.

• The firm assures all needed experiments for checking the bridge carefully with a governmental representative committee that goes as follows :-

*The experiment must show Loading side walk with a load of 450 kgs/meter as the established calculated load

* With existed load on the side walk, 3 lines of heavy drawing machines equal in cargo should pass forward and backward with a different speed on each opening as the committee sees, and to walk on the most sensitive position of the bridge organs, so as the experiment must prove that the efforts did not exceed the allowed efforts in addition to the fact that the apocopation in main & branched beems should not exceed 1/15 from the calculated apocopation, and that this apocopation should be ended by the removal of the loads.

• Navigational opening should not exceed

(5 minute), beside checking all mechanic and electric machines that are responsible of the bridge movement, fixing and centralizing, with an accurate technical check without any technical defects.

• Checking all bridge parts whether structures, or concrete works so that no defects or fission should appear.