The superstructure

 

The invention relates to the construction and can be used in the construction of bridges, in particular wooden. The superstructure includes the United carriageway main wooden farm rigidity, formed top and arched shapes of the bottom belts with the system posts and braces. What's new is that it contains additional supporting structures in the form of an intermediate flexible arches that support cross-beams of the roadway, which is installed racks supported on the intermediate flexible arch, between the cross beams in the longitudinal direction and each transverse row between racks installed vertical and in the plane of the upper chords of rigidity and lower zones of the transverse beams in the longitudinal and transverse directions is set horizontal. The technical result of the invention is to reduce material consumption, reducing the cost of spans, increasing the stiffness of the bridge and improve its performance. 6 Il.

The invention relates to the construction and can be used in the construction of bridges, in particular wooden.

Known team arched bridge farm is [1].

A disadvantage of the known solutions is the greater complexity of the design and technology of its manufacture, as well as the use of expensive and scarce material from which made the farm elements (plywood pipe), increased consumption of round steel bars inside the pipe.

Known the span of the combined system as the main girder truss stiffness, reinforced underneath them flexible arches [2]. This solution is the closest to the technical essence and the achieved result to declare, therefore, taken as a prototype. Farm stands are as flat system receiving the load from the cross-beams.

The disadvantage of the prototype is the high consumption and low efficiency of the design due to the need to develop the cross-section of the beams and to complicate the construction to ensure rigidity.

The objective of the invention is the reduction of material consumption, reducing the cost of spans, increasing the stiffness of the bridge and improve its performance.

The technical result is achieved by the spatial design of the superstructure of the bridge, including the United roadway Choi posts and braces, what's new is that the superstructure contains additional supporting structures in the form of an intermediate flexible arches that support cross-beams of the roadway, which is installed racks supported on the intermediate flexible arch, between the cross beams in the longitudinal direction and each transverse row between racks installed vertical and in the plane of the upper chords of rigidity and lower zones of the transverse beams in the longitudinal and transverse directions is set horizontal.

In Fig.1 shows the superstructure, front view; Fig.2 - the same, top view (flooring roadway conventionally not shown); Fig.3 - section a-a in Fig.2; Fig.4 - section b-B in Fig.3; Fig.5 - section b-b In Fig.3; Fig.6 - section G-G in Fig.3.

The superstructure includes the main farm hardness 1, located between the flexible arch 2, the roadway of the transverse beams 3 deck 4. Under cross beams 3 installed rack 5, supported on the intermediate flexible arch 2. Between the posts 5 in each transverse row (Fig. 4, 5, 6) mounted transverse vertical linkages 6, and between the transverse beams 3 is a longitudinal vertical linkages 7. In the plane of the upper peasantlike connection 8.

A system of horizontal and vertical linkages is provided by the spatial rigidity of the superstructure, which works as a spatial structure. When this cross is heavily loaded beams have an intermediate oppoosed support, so unloaded and can be designed lighter and simplified construction. Substantially unloaded and the main farm stiffness, the design of which is also simplified and is lightweight. The effect of razrusheniya transverse beams and trusses stiffness also increases collaboration of cross-beams and flexible arches with vertical transverse relationship.

Thus, the load perceived by cross beams are transmitted to the supports of the bridge over shorter routes, which, consequently, increases the stiffness of the superstructure and increases its performance.

However, the transverse beam having a reduced height section can be supported on the main farm in the upper zones, which simplifies the construction of the support nodes.

Sources of information 1. RF patent 2020199, E 01 D 5/00, 15/12.

2. Bridges and structures on the roads. Part 1. Gibshman E. E., Nazarenko, B. P., Izd-vo "Transport", 1972, S. 146, Fig. 76,b (protoceratidae part of the main wooden farm stiffness, educated upper and arched shapes of the bottom belts with the system posts and braces, characterized in that it contains additional supporting structures in the form of an intermediate flexible arches that support cross-beams of the roadway, which is installed racks supported on the intermediate flexible arch, between the cross beams in the longitudinal direction and each transverse row between racks installed vertical and in the plane of the upper chords of rigidity and lower zones of the transverse beams in the longitudinal and transverse directions is set horizontal.

 

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SUBSTANCE: span structure includes reinforced concrete panel connected to steel beam by rests embedded in panel body and welded to steel sheet secured to beam. Steel sheet is connected to steel beam belt by high-strength bolts inserted in belt orifices. Orifices have circular shapes in over-pier zone, remainder orifice parts are oval and located so that major oval axis extends along longitudinal span structure axis. Lengths of oval orifices are variable and depend on degree of elastic deformation due to applying squeezing force to reinforced concrete. The greatest length is in preloaded reinforcement anchoring area and length is reduced towards over-pier zone. Ratio between maximal length a of oval orifice to length b of orifice located in over-pier zone and having minimal length a/b = 1.0 - 4.0. High-strength bolts inserted in oval orifices are closed with protective caps to protect bolts against concrete action. Cap contour mates to oval orifice outline. Method of span structure production involves concreting reinforced concrete panel and applying tensioning force to high-strength reinforcement on steel sheet having rests welded thereto and connected to steel beam, wherein steel sheet is connected to steel beam by high-strength bolts inserted in oval orifices and bolts are slackened before reinforcement tensioning. After that reinforced concrete panel resiliently reduces in length on beam belt under the influence of squeezing force and bolts slide along longitudinal orifice. Then protective caps are taken off and blots are tightened with desired force.

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2 cl, 4 dwg

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