Pontoon bridge equipping method at high flow velocity

FIELD: construction industry; bridges.

SUBSTANCE: method of pontoon bridge equipping at high flow speed is performed using set of railway pontoon ribbon bridge and differs in the fat that bridge stiffness on water obstacle is provided by anchors which are installed on bridge top and bottom sides and are attached to bottom of outer pontoons with the help of ropes which pass through lugs fixed on rings welded to deck and bottom of outer pontoons.

EFFECT: increasing vertical component of hydrodynamic forces, reducing the different of member to top or bottom sides, and improving pontoon bridge reliability.

3 dwg

 

The invention relates to a method of Assembly of the bridges, in particular to methods for hardware floating bridges kit floating bridge-ribbon rail water obstacles with great velocity.

The most widely used in the equipment crossings found pontoon-bridge parks that are used to build bridges of individual floating units. However, the equipment and maintenance of river crossings with a high speed of flow is a difficult task, especially in the conditions of propagation of a breakthrough, resulting in the destruction of the dam waterworks.

The known method equipment crossings in conditions of high velocity water obstacles implemented by the tip floating bridges with carrying out maintenance activities that increase the stability of the bridge by reducing the precipitation of its parts, which is achieved by reducing the capacity of the bridge or by increasing the distance between the moving loads /1/.

However, when using the known method of terminal equipment does not resolve the reason that causes the pitch of the parts of the bridge due to the loss of stability in the flow at a high flow rate, and reducing the load capacity of the bridge does not allow you to use it on purpose.

There is also known a method of hardware floating bridge with a high speed net is tion, carried out using a kit floating bridge-ribbons train /2/. The sustainability of the bridge on the water barrier is anchors installed with the upper and lower sides of the bridge and secured with ropes on the upper deck at the pontoons.

However, the known method has the following disadvantages. Practice equipment floating bridges with a large velocity shows that by increasing the velocity of the bridge by the water flow, the decrease of the pressure on the lines and at the bottom of the pontoons. Due to the uneven distribution of hydrodynamic pressure is reduced to the point of application ravetastic forces hydrodynamic pressure, which provides a trim level in horse or downstream direction and leads to the loss of stability of the bridge in the stream. While fixing anchors with ropes on the upper deck increases krenawi moment, and with increasing velocity, the pitch increases and the bridge loses its stability in the stream, which requires to reduce its capacity, resulting in reduced performance of the bridge. Therefore, the use of a known process equipment floating bridge in these conditions is a complex task, and in many cases eliminated.

The purpose of the proposed method is increased the e reliability floating bridge-tape train with his equipment on a water obstacle at high speed currents, the ability to use floating bridge-tape train during propagation breakthrough by increasing the hydrodynamic resistance of the bridge in the stream.

This goal is achieved by the fact that in the proposed method, equipment floating bridge at high speed currents, carried out using a kit floating bridge-ribbon rail, the resistance of the bridge on the water barrier is provided anchors installed with the upper and lower sides of the bridge and secured with ropes on the bottom extreme of the pontoons.

Comparable analysis of the proposed solutions with the prototype shows that the inventive method differs from the known fact that when equipment floating bridge with a high speed of flow or in the conditions of propagation of a breakthrough by fixing anchors with ropes on the bottom extreme of the pontoons increases the vertical component of the hydrodynamic forces due to the increase of the reducing point that helps lower trim level horse or downstream side.

Thus, the claimed method meets the criterion of "novelty."

Known methods of coupling the floating bridge, which uses constructive activities, which increases the stability of the bridge in the stream by increasing the width of the bridge units is the introduction of additional pontoons /3/.

But with these methods, equipment crossings require the use of additional crossing means. In addition, when using these methods try to remove the trim, not excluding reason of his calling, what is achieved in the claimed technical solution that gives you the ability to equip the pontoon bridges at high flow rate using all available equipment floating railway bridges.

This allows to make a conclusion on the conformity of the proposed solutions to the criterion of "significant differences".

The invention is illustrated by drawings, where figure 1 shows the scheme of the plot floating bridge side deck; figure 2 shows a diagram of the equipment of the bridge cross-section along a-a in figure 1; figure 3 shows a diagram of the mounting anchors in the extreme pontoon with horse side of the bridge.

The proposed method equipment floating bridge is implemented as follows.

After unloading on the water floating bridge, assembled from parts 1, consisting of a collapsible pontoons, including medium 2 and at 3 pontoons, with the deck 4 and the bottom 5, with a fixed shields-lines 6 in the extreme pontoons 3, is an Assembly of links 1, which is inserted in the axis of the bridge, where they are docked, riding down 7 and lower 8 anchors attached to the bottom 5 extreme pontoons 3 the use of cables 9, which are passed through the earring 10, secured in the rings 11 which are welded to the deck 4 and the bottom 5 extreme pontoons 3.

Post-tensioning cables and alignment of the bridge axis crossing pontoon bridge goes into operating position. The water flow together and raced to the extreme contours of the pontoons, creates due to fluid pressure for more righting moment and the additional lifting force. This increases the action of restoring forces, helps to reduce the pitch of the bridge units, which increases the hydrodynamic resistance of the bridge in the stream.

Thus, the use of the proposed method equipment floating bridge at high speed currents, carried out using a kit floating bridge-ribbon rail, in which the resistance of the bridge on the water barrier is provided anchors installed with the upper and lower sides of the bridge and secured with ropes on the bottom extreme of the pontoons, provides in comparison with existing methods the reduction of the pitch of the bridge by increasing its hydrodynamic stability, which can significantly improve the reliability of the floating bridge, induced from a set of floating bridge-tape train, when his equipment on a water obstacle with great velocity.

In addition, application of the above is the procedure provides the possibility of using floating bridge during the passage of waves breakthrough.

Sources of information

1. Pontoon-bridge Park RAP. Guide to the material and application. M: Voenizdat, 1981, S. 202-204.

2. Website: http://www.nkj.ru/archive/articles/8086/3.

3. Smith became popular, Kozlov, M.A., Shlyapin, Y.M. Equipment and maintenance of river crossings. M: VÍA, 1980, P.27.

The way hardware floating bridge at high speed currents, carried out using a kit floating bridge-ribbon rail, characterized in that the resistance of the bridge on the water barrier is provided anchors installed with the upper and lower sides of the bridge, which is glued to the bottom extreme of the pontoons with the help of cables passed through earrings, mounted in rings welded on the deck and at the bottom of the pontoons.



 

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