RU2406796C1 - Method of bridge span launching - Google Patents

Abstract

FIELD: construction. ^ SUBSTANCE: invention may be used in device for bridge span launching, including sliding tracks, pushing accessories and limiters of side displacement in the form of bead rigidly fixed on bridge support and having stands with fixed side supports interacting with lower belt of span with inbuilt crossbar. The novelty is the fact that stands of side displacement limiters are arranged as hollow, inside of them there is a spring and spring-loaded element, capable of limited vertical displacement and equipped with head in upper part with polished sheet bevelled at sides. Stands of side displacement limiters are arranged on bridge support bed on both sides of balance beams along with launching. Front and back fairings interacting in process of launching with polished sheet of spring-loaded element head are fixed coaxially to stands to lower belt of span in zone of inbuilt crossbar arrangement. Stands of side displacement limiters may be arranged with square section. Side supports on head of limiter stand have angular bevels in vertical plane. ^ EFFECT: increased operational reliability. ^ 3 cl, 5 dwg

Description

The invention relates to bridge construction and can be used in devices for sliding the bridge span.

A device for sliding the bridge span is known, including sliding paths, pushing devices, a balancing beam, a support part and lateral movement limiters made in the form of a frame rigidly fixed to a bridge support with racks having stops pivotally attached to them [1].

The disadvantage of this device can be attributed to the need for its dismantling and installation when passing along the slip paths on the span support in the area of the built-in crossbar. This requires significant labor costs, interrupts the sliding process for a considerable time and thereby reduces the pace of installation.

The objective of the present invention is to increase the pace of installation by providing a continuous process of sliding the span with a built-in crossbar.

The problem is solved due to the fact that in the device for sliding the bridge span structure, including sliding paths, pushing devices and lateral movement limiters in the form of a frame rigidly attached to the bridge support with struts having lateral stops fixed to them, interacting with the lower belt of the sliding span buildings with a built-in deadbolt, the bed stands are hollow, a spring is located inside them and a spring-loaded element attached to it, with the possibility of a limited vertical movement and equipped in the upper part with a head with a polished sheet and a lateral stop on the sides, and the stop rails are placed on the bridge support frame on both sides of the balancing beam along the span slide, and coaxially attached to the lower span of the span in the area of the built-in crossbar racks of limiters front and rear fairings interacting with a polished sheet of the head of the spring element.

Racks of lateral limiters have a square section.

The side stops have angled bevels in a vertical plane.

The invention is illustrated by drawings, where:

figure 1 shows a temporary support with a device for sliding and spans located on it, cross section;

figure 2 shows the temporary support at the time of passage through it of the built-in crossbar of the superstructure, cross section;

figure 3 shows a temporary support with a device for sliding and a superstructure with a built-in crossbar, side view.

4 shows a lateral movement limiter, side view;

figure 5 shows the lateral emphasis, a view of 1-1 of figure 4.

Recently, spans 1 with T-shaped main beams 2 and with a built-in crossbar 3 have found wide application in bridge construction.

When installing spans 1 with a built-in crossbar 3, devices for their longitudinal slide are used, including sliding paths 4, supported through the balancing beam 5 and the supporting part 6 on the frame 7, which is fixed in turn on a temporary (permanent) support 8. Device for longitudinal sliding It also includes pushing devices (not shown in the drawing) and lateral movement limiters 9, made in the form of hollow posts 10, mounted on a bed 7. Inside the hollow posts 10, springs 11 are installed, to which spring-loaded lementy 12 with possibility of a limited vertical movement and provided with a head part with a lateral stop 13 and a polished sheet 14 with lateral bevels 15.

Racks 10 can be square, and the side stops 13 have angled bevels 16 in the vertical plane, which ensures when sliding the free passage (without jamming) of the lower belt 17 of the span 1 relative to the side stops 13.

The front 18 and rear 19 fairings with lower inclined planes 20, 21, interacting with the polished sheet 14 of the heads of the hollow racks 10, are attached to the lower belt 17 of the span 1 in the area of the built-in crossbar 3.

Hollow racks 10 of lateral movement limiters 9 can be located on the bed 7 on both sides of the balancing beam 5 along the slide of the superstructure on the temporary support 8.

The process of sliding the span 1 is as follows.

The span structure 1 assembled on the shore with the built-in crossbar 3 is successively pushed along the sliding paths 4 temporary (permanent) supports 8 using pushing devices, while the struts 10 interact with the lower belt 17 by means of side stops 13 with angular bevels 16, holding the span 1 from lateral displacements. When passing the built-in crossbar 3 along the support 8, the inclined planes 20 of the front fairings 18 smoothly run into the polished sheet 14 of the heads of the spring elements 12, lower them below the level of the lower belt 17, thereby ensuring free passage of the built-in crossbar 3 along the slip ways 4. After passing the built-in crossbar 3 along sliding paths 4 inclined planes 21 of the rear fairings 19 smoothly slide off the polished sheet 14, providing a smooth (without jerking) return to the initial position of the spring-loaded elements under the action of the springs 11 Comrade 12.

This invention will allow for a continuous process of sliding the superstructure 1 without dismantling the lateral movement limiters 9.

The source of information

1. A.V. Kruchinkin, V.K. White. "Installation of steel spans for bridges." M .: "Transport", 1978, p. 176, Fig. VI.1.

Claims (3)

1. A device for sliding the bridge span, including sliding paths, pushing devices and lateral movement limiters in the form of a frame rigidly attached to the bridge support with struts having lateral stops fixed to them, interacting with the lower belt of the span with the built-in crossbar, characterized in that the racks of the lateral movement limiters are hollow, a spring and a spring-loaded element are located inside them, with the possibility of limited vertical movement and equipped with a cap at the top with a polished sheet beveled on the sides, and the lateral limiter struts are placed on the bridge support frame on both sides of the balance beam along the slide, and the front and rear fairings are attached to the lower belt of the span in the area of the built-in crossbar interacting in the process of sliding with a polished sheet of the head of the spring element. 2. The device according to claim 1, characterized in that the racks of the lateral movement limiters are made of square section. 3. The device according to claim 1, characterized in that the side stops on the head of the limiter strut have angled bevels in a vertical plane.

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