There are many similarities between Bailey steel bridges and steel truss bridges, as well as many differences. We introduce the two bridges to you in terms of bridge structure, installation method and application.

Different Bridge Structures

Bailey Steel Bridge Structures

Bailey bridge is mainly composed of truss element members, beams, longitudinal beams, bridge decks, bridge seats and connectors. According to the different loads and spans, the strength of the bridge is improved by increasing the number of steel trusses. There are single-row single-layer (English abbreviation SS), double-row single-layer (English abbreviation DS), three-row single-layer (English abbreviation TS) .
The main structure is composed of 3-meter-long trusses connected by pins, located on both sides of the roadway. The trusses are connected by beams, and each truss is provided with two beams; end post. The main truss is supported on the bridge seat (support) and the support plate through the end column, and the bridge and the embankment can be connected by the approach bridge. The whole bridge is equipped with many connecting components such as diagonal braces, wind-resistant tie rods, support frames, and connecting plates, etc., so that the bridge forms a stable spatial structure.

Steel Truss Bridge Structures

Steel truss bridge refers to a bridge with a truss as the main load-bearing member, which is mainly composed of an upper chord, a lower chord and a web member. The plane in which the chords and webs lie is called the main truss plane. The appearance structure is mostly triangular, and the triangular webs between the horizontal long chords prevent the chords from bending or bending. Most truss bridges have large spans, so out-of-plane stiffness is relatively weak, requiring bracing. A truss bridge supports the structure itself by pulling the individual members together in tension and compression into a tight, strong, rigid structure.

321 Steel Bridge

Different Ways to Install Bridges

Bailey Steel Bridge Installation

The bailey bridge is a modular bridge, assembled from individual bailey trusses. Bailey bridge assembly covers a small area, which can avoid the situation that large hoisting equipment cannot enter the construction site. The installation of bailey bridge mostly adopts the cantilever push method. Rock and roll are installed on both sides of the river, and then the components of the bailey bridge are assembled. Under the traction of manpower and machinery, the bridge is slowly sent to the opposite bank. Finally lay the bridge deck.

Steel Truss Bridge Installation

Steel truss bridges cannot be installed individually due to the large volume of components and the high height of the bridge body, and the cooperation of cranes is required. First install the bridge body of the lower chord as a support, then install the vertical rod to support the inclined rod, and finally install this small part of the upper chord. Each time a triangular structure is used as a unit, the overall bridge is gradually built.

Different Bridge Applications

Bailey Steel Bridge Application

The bailey bridge is limited by its structure and bearing capacity, and the standard length will not exceed 60 meters. Therefore, it is generally used in terrains that span rivers, valleys and spans that are not very large.

Steel Truss Bridge Application

Steel truss bridges, such as Tokyo’s Jingmen bridge, can have large spans in length, mainly due to their large triangular structure. Through the combined force of the upper and lower strings, it can support scenes with a large carrying capacity of urban traffic.

Some people ask, is it better to use the bailey bridge or the truss bridge? I think this should be chosen in combination with the actual application scenario of the bridge. Whether iBeehive bridges or steel truss bridges, iBeehive can deliver. Please contact us if necessary.

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