RU2406794C1 - Cable-braced bridge pylon head - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: pylon head of cable-braced bridge of combined system consists of external concrete part and metal anchor structure fixed in it, arranged in the centre of pylon and made composite along height from joined bearing elements, which are equipped with anchor protruding parts arranged at each level of cables anchoring. The novelty is the fact that bearing elements of composite metal anchor structure consist of side walls, being the bearing element of protruding anchor part and combined by means of vertical sheets and system of horizontal membranes. Side walls and vertical sheets have flexible rod supports embedded into concrete part of head, and combination of elements along height is arranged between vertical walls and sheets by means of joints of pads and high-strength bolts. Ends of anchor ledges may be equipped with additional transverse membranes.

EFFECT: increased operational reliability.

2 cl, 5 dwg

Description

The invention relates to bridge construction and can be used in the construction of the pylon heads of cable-stayed bridges.

Known for the head of the pylon of the Baytovy bridge of the combined system, consisting of an external concrete part and a metal anchor structure fixed inside it, located in the center of the pylon and made in height from the load-bearing elements joined together, which are equipped with anchor outlets located at each level of cable anchoring [1 ].

The disadvantages of this head are very bulky and difficult to manufacture elements of a metal anchor structure, designed for anchoring cable-stayed bridges of large spans (more than 500 m), and the inability to use them in heads of limited sizes with spans of the order of 150-200 m, and the anchor outlets are oriented strictly along the axis the bridge.

The objective of the present invention is to provide a universal head for all types of cable-stayed spans (from 150 m and more) and the possibility of anchoring, except for the central, also fan-mounted cables, attached to the sides of the span.

The problem is solved due to the fact that in the head of the pylon of the Baytovy Bridge a combined system consisting of an external concrete part and a metal anchor structure fixed inside it, located in the center of the pylon and made in height from the load-bearing elements joined together, which are equipped with anchor outlets, located at each level of cable anchoring, the elements of the composite metal anchor structure consist of side walls, which are the supporting element of the anchor outlet and ennyh sheets interconnected by vertical and horizontal diaphragms system, wherein the side wall sheets and the vertical stops are flexible rods embedded in the concrete part of the well head, and the union of bearing elements between an adjustment performed using the device of the linings of joints and high strength bolts.

According to one embodiment of the invention, the ends of the anchor protrusions are equipped with additional transverse diaphragms.

The invention is illustrated by drawings, where:

- figure 1 shows a metal anchor structure, a perspective view;

- figure 2 shows a metal anchor structure, side view;

- figure 3 shows an element of a metal anchor structure, side view;

- figure 4 shows an element of a metal anchor structure, top view;

- figure 5 shows a pylon with attached cables.

The pylon 1 of the Byte bridge contains the head of the combined system 2, consisting of the outer concrete part 3 and the metal anchor structure 4 built into it, designed to receive and transmit horizontal forces from the cable-stayed nodes to the concrete part 3. The metal anchor structure 4 is placed in the center of the pylon 1 and is made of a height-height component made up of load-bearing elements 5. The load-bearing elements 5 are equipped with anchor outlets 6 located at each anchoring level of the cable-stayed 7 and oriented in space in accordance with the approach direction of each cable-stayed 7.

Bearing elements 5 are formed by side walls 8, which are the main element of the anchor outlet and interconnected by vertical sheets 9 and a system of horizontal diaphragms 10. Side walls 8 and vertical sheets 9 have flexible rod stops 11 evenly distributed on their surface, embedded in the concrete part 3 of the head 2. The rod stops 11 provide the transmission to concrete of the total vertical forces from the cables and the difference in horizontal forces in the cables from the side of the anchor and channel span.

The vertical sheets 9 and the side walls 8 of the supporting elements 5 are joined together in height by means of butt pads 12 and high-strength bolts 13. The outer ends of the anchor outlets 6 can be equipped with additional transverse diaphragms 14 with a semicircular cutout 15. This will make the construction of the anchor outlets more rigid 6. At the ends of the anchor outlets 6, holes are made to which the upper anchors 16 of the cable-stayed 7 are bolted, and the lower anchors 17 of the cable-stayed 7 are attached to the spans 18.

The head 2 is constructed as follows. When the pylon 1 reaches the mark of the beginning of head 2 during concreting, the support bearing element 5, pre-assembled on the construction site, is fed to the top of the head and secured to the center of the pylon 1, after which the following bearing elements 5 are sent to head 2 and are joined together using butt pads 12 and high-strength bolts 13. Then the head 2 is concreted, combining the concrete part 3 and the metal anchor structure 4. The anchors 16 of the cable 7 are then combined at the top with the anchor protrusions 6 of the head 2, and the anch ry 17 with the respective protrusions 18 of the superstructure.

The present invention will allow to exclude the work of the concrete head in tension and reduce the geometric dimensions of the head in plan.

Information sources

1. Proceedings of the international congress on suspension and cable-stayed bridges. Deauville, France, October 12–15, 1994, “Building Two Pylons of the Normandy Bridge,” Volume I, pp. 613-616, pp. 667-675. The Congress is organized by the International Association of Bridges and Structures and the International Federation of Prestressing (see Appendix No. 1 for 5 liters).

Claims (2)

1. The head of the pylon of the cable-stayed bridge of the combined system, consisting of an external concrete part and a metal anchor structure fixed inside it, located in the center of the pylon and made in height from the load-bearing elements joined together, which are equipped with anchor outlets located at each level of cable anchoring, characterized in that the supporting elements of the composite metal anchor structure consist of side walls, which are the supporting element of the anchor release and are interconnected vertical sheets and a system of horizontal diaphragms, with the side walls and vertical sheets having flexible rod stops embedded in the concrete part of the head, and the height of the elements was joined together between the vertical walls and sheets using joints from overlays and high-strength bolts. 2. The pylon head of the cable-stayed bridge according to claim 1, characterized in that the ends of the anchor protrusions are equipped with additional transverse diaphragms.

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