FI80744C - Wooden sling, gear or bridge stock - Google Patents

Description

1 80744

Wooden sleepers, sleepers or bearers

The invention relates to a wooden track, gear or bridge sleeper comprising a plurality of adjacent and overlapping glued pine lamellae and reinforcements for rails.

It is already known to manufacture track, gear and bridge sleepers by gluing. The most significant use of glulam logs is on the South African railways with SAR, 10 where glued pine logs are in general use. The latest and most complete summary of glued logs is in the Nordic Rail Technology Cooperation Group's (NBS) Information Report No. 11, 27 April 1983. The report also has an extensive bibliography. Glued wood dusts must be impregnated, because impregnation increases the life of the wood log by at least 5 times compared to the unsaturated log. For economic reasons, an optimal solution for impregnation, gluing and track technology must be sought.

The most important thing is that a moit-20 result is achieved in terms of track technology. From the point of view of impregnation technology alone, pine would be the most preferred wood species. The prevailing impregnation technology with pine logs is the so-called RUping's saving method and impregnating agent is creosote oil. The impregnation process of pine logs is the shortest in duration and the consumption of impregnating agent is the lowest. The pine is the so-called soft wood species and requires a relatively large washer between the rail and the log. It would therefore be advantageous to reinforce the pine log with a hard wood species at the rail attachment. The hard wood species that we come to confirm in question is birch. The practice shows that when using birch, washers can be omitted, which significantly improves the competitiveness of the hardwood log compared to other alternatives. However, the process of impregnating birch is quite different from that of pine. Likewise, birch requires 2 to 4 times the amount of impregnating agent compared to pine.

2 80744

It should also be noted that creosote-impregnated wood cannot be glued (RIL 153 Glulam Structures 1984). Instead, salt-impregnated wood can be glued. Due to the operating conditions of the sleeper, the adhesive must be moisture resistant, e.g. resorcinol-phenol-resin adhesive.

The object of the present invention is therefore to provide a log which makes it possible to minimize expensive hardwood (birch) due to impregnation and to use the advantageous Rii-10 Ping saving method in impregnation. With the log according to the invention, this is achieved in that the reinforcements consist of hardwood-impregnated hardwood rods glued to the uppermost pine lamellae by means of a finger joint.

15 Since it is obvious that pine lamellae contain more surface wood than a sleeper normally, the impregnation result is better than with a solid pine sleeper in general. Thanks to the hardwood reinforcement, it is possible to use the log without washers.

The invention will now be described in more detail with reference to an example according to the accompanying drawing, in which Fig. 1a shows a log according to the invention in the rail direction, Fig.

The hardwood-reinforced glued sleeper 1 is manufactured industrially by first gluing 40 mm 30 log-wide pine lamellas 2, 2a, from which the uppermost lamella 2a enters the rail at the center of the rail with 400 mm long finger-jointed hardwood pieces 3 pre-filled. Thereafter, the log-length lamellae 2, 2a lii-35 are joined together into a sleeper 1. The final step is the impregnation of the log 3 80744 with creosote oil and the Riping saving method.

The presented solution can also be used to manufacture replacement logs. In this case, the reinforcement must be placed centrally at the rail mounting, as with track 5. It is also possible to make a silk can. The sleeper differs from the sleeper only in thickness, so only more pine lamellae are needed.

Claims (3)

4,80744 1. Syli-, växel- eller brostock (1) av trä, vilken omfattar flera bredvid ocp pä head varandra belägna, i varandra 20 limmade lameller av tali (2, 2a) samt förstärkningar för skenor, kännetecknad därav, att förstärkning-arna bestär av i de översta lamellerna (2a) av tali me-delst en fingerförbindning limmade, i stockens längdrikt-Ning löpande saltimpregnerade härdträstavar (3). A wooden track, gear or bridge sleeper (1) comprising a plurality of adjacent and overlapping pine lamellae (2, 2a) glued together and reinforcements for rails, characterized in that the reinforcements consist of those glued to the uppermost pine lamellae (2a) by means of a finger joint, longitudinally salt-impregnated hardwood rods of the log (3). 2. Stock enligt patentkravet 1, känneteck nad därav, att härdträstavarna (3) är av Björk. Log according to Claim 1, characterized in that the hardwood rods (3) are birch. Log according to Claim 1 or 2, characterized in that the length of the hardwood rods (3) is approximately 40 cm. 15 3. Stock of patent patent 1 or 2, spaced apart, of which the truss (3) is approximately 40 cm. 30 II