Bailey Bridge System Solution - Railroad track

The Bailey bridge was invented by British engineer Donald West Bailey in for war. A Bailey bridge is a kind of bridge made of welded modular panels and parts. It is also called the Bailey truss bridge because of the steel truss construction structure. The components are single pieces and very light in weight so that a bailey bridge can be assembled and transported easily. A Bailey truss bridge is suitable for various spans and loads. As for the configuration, there are SS(Single-Single), DS(Double-Single), TS(Triple-Single), DD(Double-Double), TD(Triple-Double), SSR(Single-Single-Reinforced), DSR (Double-Double-Reinforced), etc. multiple types.

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Application

Bailey bridges are extensively used in highways, railways, and bridges throughout the world, especially in remote regions, to facilitate transport. They are mostly built as temporary bridges, emergency bridges, prefabricated pedestrian bridges, and vehicle bridges. Under other conditions, they can be transformed into a gantry crane, trestle bridge, supporting system, bridge girder erection machine, Bailey bridge for pipes crossing, etc.

Model Alias: 100-Type
Model Derived: CB100,Compact-100,British 321-Type
Bridge Deck Net Width: 4M
Maximum Free Span length: 51M
Panel Dimension: 3mX1.4m/3.048m X 1.45m (Holes center distance)

The 321-Type Bailey bridge is a bridge that can be quickly built due to its simple structure. The design rules follow the British Compact-100 Bailey Bridge. The components of the bridge are prefabricated with high-tensile strength steel. All the components are single parts which leads to easy interchange. The assembly or disassembly is also simple. Combine the parts with different numbers and layers to get the desired span length and load requirement. Based on convenience and easiness, it is extremely suitable to facilitate temporary and emergency transportation. The 321-type (CB100) Bailey bridge is mainly applied when the requested bridge span or load is small.

Model Alias: HD200，CB200，ZB200
Single Lane: Bridge deck net width: 3.15m.
Maximum Free Span Length: 60.96m
Extra Width Single Lane: Bridge deck net width: 4.2m.
Maximum Free Span Length: 60.96m
Double Lanes: Bridge Deck Net Width: 7.35m.
Maximum Free Span length: 45.72m
Panel Dimension:MMXMM(Holes center distance)

The 200-type panel bridge is designed to provide a wider range of load and span. Compared to the 321-type, the panel height is increased to 2.134m. By placing alternated joints between Reinforcement Chords against the joints between panels, inelastic deformation because of oversized pinholes can be decreased. At the same time, a pre-arch method greatly reduced mid-span and vertical deflection. The orienting sleeve-fixing method of bolt-connected segments not only improves the connection accuracy but also creates shear and tension resistance. As a result, the lifespan of the bolts is extended and the safety of panel bridges is guaranteed. The wind-resistant brace is made into an all-in-one piece type and is connected to the transom to improve the overall stability of panel bridges. The part between the braced frame and panels is fixed through bridging to prevent the whole bridge from side bending. A pre-arched degree throughout the bridge is formed after the bridge’s erection. 200-type Bailey bridge is suitable for the load designs of HS-15, HS-20, HS-25, HL-93 and pedrail-50 etc.

Known as a portable prefabricated steel truss bridge, Modular Steel Bridge or Bailey Bridge is extensively used in various applications. Developed and introduced in 's by an English Civil Servant and Engineer, Sir Donald Bailey. Used during the second world war by the British, Canadian, and Military units. The concept behind the Bailey Bridge was to offer a temporary bridge that could rapidly and manually be created in emergency situations.

This was due to its girder and deck systems that can be strengthened at will and constructed without requiring special tools or heavy equipment. The elements and materials should be readily available, not necessarily big and light but flexible. On top of this, they should be strong enough to carry and sustain loads like those of heavy tanks and other machineries.

The bridge boosts socio-economic development by establishing vital connections and delivering supplies, especially to distant areas.

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They are instrumental in assisting isolated villages to this day to access larger communities where education and medical resources may be more available. Bailey bridges can assist significantly during humanitarian relief situations to extend help in emergencies brought by natural disasters, war, or terrorism.

ESC Group started offering Bailey Bridge options in -an add-on to the company’s structural steel division. The success with its fabrication and sales shows great potential in different regions for provisional, makeshift, and permanent bridge structures. Focus will be firstly on Asia and Latin America for sales.

The ESC-HD-100 Bailey Bridge - derived from British 321-Type is suitable for short to medium spans or light to moderate loads.

It can stand to a maximum free span length of 51 meters (167.30 feet), with a deck net width of 4 meters (13.10 feet). The bridge panels are composed of welded high-grade structural steel elements. The girders are lightweight composite panels connected by sturdy steel pins.

Panels and components of the steel bridge are easy to handle and transport can be interchanged. Being lightweight, this bridge type is guaranteed for emergency and difficult situations.

Different configurations and dimensions of bridge panels can also be custom built. They can also be assembled into different forms of panel bridges according to their span length and transportation requirement.

The upgraded version of ESC-HD-100 is the ESC-HD-200 Bailey Bridge. With panel heights increased to 2.13 meters (7 feet), it can cover a maximum free span of 60.96 meters (200 feet) for single-lane width and 45.72 meters (150 feet) for double lane width. In this model, joints between panels are located alternately against the joints between reinforcement chords to reduce inelastic deformation due to oversized pinholes.

Pre-arch or camber is employed to counter deflection of the bridge at the mid-span.

All bolted connections are equipped with orienting sleeves to ensure that compression forces are absorbed by the sleeve and tensions by the bolts. This helps to increase the life span of the bolts and generally the safety of the panel bridge. Composite braces against wind loads are also provided and connected to the transoms or girders to enhance the overall stability of the bridge, especially against side bending.

Nowadays, Bailey Bridge is considered an engineering innovation due to the bridge designs’ continuous modern standardization and modularized nature. Bailey Bridge could be modified based on different span lengths and strengths. True to the original concept, the bridge was also made to be assembled and disassembled as needed.

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