RU180896U1 - GLUED COMPOSITION WOODEN PERFORMANCE REINFORCED BY CARBON PLASTIC - Google Patents

Abstract

The utility model relates to the field of construction of wooden temporary and short-term road bridges. In particular, it can be used for the manufacture of beam spans from wooden girders of low-water road bridges. The technical task of the utility model is to increase the carrying capacity of beam wooden spans from girders. This technical problem is solved due to the fact that the glued composite wooden girder reinforced with carbon fiber , consists of edged boards, characterized in that between the lower and upper belts there is a package of glued boards placed on the edge and pulled together but with several horizontal bolts with vertical metal plates, while both belts are nailed to the planks of the package with inclined nails, and a carbon fiber strip is glued to the lower belt and the ends of the run, the ends of which are fixed with glue and nail connectors on the upper belt near the ends of the run.

Description

The utility model (hereinafter - PM) refers to the field of construction of wooden temporary and short-term road bridges. In particular, it can be used for the manufacture of beam spans from wooden girders of low-water road bridges [1].

Known designs of wooden composite runs for the device beam spans of temporary and short-term bridges [1, 2]. They are adopted as a prototype PM.

The main disadvantage of typical runs is their unsuitability for the safe passage of modern loads (up to 80 tf) while maintaining the existing dimensions, since they were designed mainly for loads of up to 60 t [3].

Polymer composite materials (fiberglass, carbon fiber, etc.) are also known, which have higher strength characteristics than wood and steel [4].

The technical task of PM is to increase the carrying capacity of beam wooden spans from girders.

This technical problem is solved due to the fact that the glued composite wooden girder, reinforced with carbon fiber reinforced plastic, consists of edged boards, characterized in that between the lower and upper belts there is a package of glued boards placed on the edge and additionally pulled together with several horizontal bolts with vertical metal plates while both belts are nailed to the planks of the package with inclined nails, and a carbon fiber strip is glued to the lower belt and the ends of the run, the ends of which on the upper belt near the ends of the run are closed Lena glue and Gvozdeva connectors.

The design of the run is shown in the figure, where it is indicated:

FIG. 1 - view of the run along the facade of the bridge; FIG. 2 (I-I) - section of the cross section of the run; pos. 1 - upper run belt; pos. 2 - a package of boards;

pos. 3 - lower run belt; Pos. 4 - carbon fiber strip; pos. 5 - nail connector; pos. 6 - inclined nails; pos. 7 - metal overlay; pos. 8 - a coupling bolt; pos. 9 - nozzle; pos. 10 - pile; pos. 11 - a layer of glue.

Glued composite run is made in the workshop in the following sequence.

Edged boards are made at the sawmill for the upper belt 1 with a thickness of 2.5-3 cm and a width of at least 15 cm, for the lower belt 3 with a thickness of 5 cm and a width of at least 15 cm. For package 2, the thickness of the boards is at least -5 cm, width - not less than 15 cm. On the plane of the boards of the package 2, a quick setting adhesive (curing) is applied. After that, the boards mounted on the ribs are rounded with clamps in packages. Package 2 must have at least 3 boards. The thickness of the bag is determined by bending. In the packages, through horizontal holes are drilled for the coupling bolts 8 with a diameter of 16-24 mm.

The distance between the holes for the bolts 8 along the length of the boards of the package 2 should be 2-2.5 m. These boards are finally rallied by plates 7 and bolts 8. After that, the clamps are removed. On the upper surface of the package 2 apply a layer of glue 11.

The boards of the lower belt 3 are attached to this surface with inclined nails 6. Then, the package 2 is installed on the lower belt 3 and glue is applied to the surface of the package under the upper belt 1. On the layer of glue 11, the boards of the belt 1 are laid and nailed 6 to the boards of the package 2. Then the package 2 turn and install on the plane of the upper belt 1. A layer of glue 11 is applied to it and the carbon fiber strip 4 is laid with pressing. After the glue has hardened, the run is turned and installed on the plane 6 of the lower belt 3, covered with a carbon fiber strip 4. The ends are simple on and sections of the upper zone near the ends are also covered with glue. Then, the ends of the upper belt covered with glue are pressed against the ends of the carbon fiber strip 4 (Fig. 1). The last operation is to fix the ends of the strip 4 on the upper belt 1 with nail connectors 5.

Ready runs are delivered to the bridge, where spans are arranged from them in bridge spans. Other technologies may apply.

Thus, the proposed design of a glued composite wooden girder reinforced with carbon fiber allows to increase the carrying capacity of spans made from wooden girders. In addition, if necessary, the run lengths of the spans themselves can be increased while maintaining their carrying capacity. This saves wood and metal compared with those costs if the technical problem was solved by increasing the cross-sectional area of the run without reinforcing it with carbon fiber.

Bibliography

1. Military bridges on rigid supports. Leadership. Military Publishing. M., 1982.

2. Telov V.I. and others. Road wooden bridges. Tomsk, 1998.

3. Technical conditions for the design of military road bridges and crossings (TUVAM). Military Publishing. M., 1974.

4. Composite materials. T 1-8. M., 1978.

Claims (1)

A glued composite wooden girder reinforced with carbon fiber, consisting of edged boards, characterized in that between the lower and upper girders of the girder there is a package of glued boards placed on the edge and additionally tightened by several horizontal tie bolts with vertical metal plates, while both belts are nailed to boards of the package with inclined nails, and a carbon fiber strip is glued to the lower belt and the ends of the run, the ends of which on the upper belt near the ends of the run are fixed with glue and nails lecturers.

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