JPH0136961Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wooden sleeper with excellent durability.

There are two types of sleepers: wooden sleepers and concrete sleepers.While wooden sleepers are inferior to concrete sleepers in terms of durability, they have good workability unique to wood, cushioning properties against impact forces, and are easy to transport and handle due to their light weight. It is widely used in railways where these performances are required, such as bridges, rail joints, points, and sharp curves.

However, since conventional wooden sleepers are made of lumber with a large cross-section, in recent years it has been difficult to obtain large quantities of sleepers with stable quality due to the difficulty in obtaining large-diameter trees, and the quality of the wood has been greatly affected by the raw wood situation. There is a need for something that can be stably supplied without any problems.

In addition, when sleepers made from conventional sawn timber are exposed to harsh outdoor weather conditions for long periods of time, internal stress is generated due to the repeated water absorption and drying caused by the characteristics of the wood, and this internal stress causes As shown in Figure 3, many cracks a occur at the end of the wood, gradually reducing the strength, and as the cracks progress, corrosion occurs inside the wood due to rotting fungi, resulting in a shortened service life.

For this reason, sleepers made of sawn timber are usually impregnated with preservatives such as creosote before use, but since they have a large cross section, they are treated with insizing (scratching the surface of the timber with a knife etc.) Even if preservative injection treatment is performed after preservative injection (a treatment method that facilitates the penetration of chemical solutions), it is difficult to allow the chemical solution to penetrate into the center, and the preservative treatment takes a long time. As a result, the wood is forcibly damaged, causing problems such as the occurrence of cracks in the wood and the progression of cracking at the end of the wood.

In order to eliminate such problems, this invention
By using a laminated material of a large number of veneers with many back cracks as sleepers instead of sawn timber products, the cracks caused by the back cracks are dispersed almost uniformly inside the sleeper, and the above preservative is applied to the sleepers. To provide a wooden sleeper characterized by being impregnated through the back crack and preservative treated to the inside, thereby providing stable quality and durability.

To explain the embodiment of the present invention with reference to the drawings, A
The sleepers are mainly made of laminated veneer wood, and are made of multiple rotary veneers 1, 1...1 with a thickness of 3 to 6 mm obtained from suitable wood such as beech and Kapol.The fiber direction of all the veneers is It is made by laminating and bonding parallel to the longitudinal direction.

These veneers 1 have many back cracks 2 along the fiber direction of the wood, and are laminated and adhered to each other with a suitable adhesive 3 such as a phenol resin adhesive to form the inside of the sleeper main body. The cracks caused by the back cracks 2 are dispersed substantially uniformly, and the entire main body of the sleeper is immersed in a preservative such as creosote, so that the preservative penetrates into the interior of the laminate through the back cracks 2. Therefore, the outer surface of the main sleeper is not subjected to insizing treatment, but the preservative treatment is applied to the center.

In this kind of preservative treatment, after forming the laminated material, the laminated material is impregnated with a preservative liquid, so that it penetrates into the interior as described above. 1 may be coated with a preservative and allowed to penetrate through the cracked part on the back.

Alternatively, the adhesive 3 may be mixed with a preservative, and the preservative may be allowed to permeate through the cracks in the back of each veneer to perform the preservative treatment even into the main body of the sleeper.

In addition, the sleepers made of laminated materials as described above may be formed by cutting a laminated board that has been formed into a large size in advance, or may be formed from a plurality of veneers 1 having the same dimensions as the planar shape of the sleepers. , also, narrow veneer 1
are joined and arranged in the plane direction to have the same width as the sleepers,
This may be laminated or bonded.

Further, at this time, the dimensional stability may be further improved by arranging a wood veneer in the fiber direction perpendicular to the length direction at an arbitrary position in the center of the laminated material.

As described above, the present invention has been developed by laminating and gluing a large number of wood veneers such as rotary veneers, which have many back cracks, with their fiber directions aligned in the length direction. A wooden sleeper is formed by forming a sleeper main body made of a laminated veneer material in which cracks caused by back cracks are almost uniformly distributed, and this sleeper main body is impregnated with a preservative through the above-mentioned back cracks. Therefore, each veneer has many back cracks and is impregnated with a preservative through these back cracks, so there is no insizing treatment such as damaging the sleeper surface, and the above back cracks can be removed. By using this method, the preservative can be impregnated into the main part of the sleeper, so there is less deterioration in strength due to scratches on the sleeper surface, and the preservative is sufficiently permeated to the inside, so the preservative effect is great. Furthermore, since the fibers of the veneers are aligned in the length direction of the sleeper and are laminated together, it is possible to form a sleeper with excellent bending rigidity, and it also eliminates wood defects such as cracks and knots. Since veneer can be used, it is possible to supply sleepers of stable quality without variations in strength, unlike sleepers made of other materials.

In addition, when railroad ties are exposed to harsh weather conditions, internal stress is generated due to shrinkage caused by repeated water absorption and drying, but this internal stress can be dispersed into each veneer, making it possible to reduce the stress from conventional sawn timber products. Without causing large butt end cracks like the sleeper,
Only small cracks occur, and as a result, the strength decreases and the progress of corrosion by decay fungi slows down, resulting in long-term use.
It is capable of maintaining stable performance.

Furthermore, since there is an adhesive layer between each of the veneers that make up the sleepers, it takes a considerable amount of time for rotting bacteria to penetrate the entire area, and it also prevents rainwater from penetrating into the center. It is possible to increase the lifespan of the product.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a front view of the same, and Figure 3 is a front view of a conventional wooden sleeper. A...Mainly sleepers, 1...Single board, 2...Cracked back,
3...Adhesive layer.

Claims (1)

[Scope of utility model registration request] By stacking and gluing a large number of wood veneers, which have many back cracks, with their fibers aligned in the length direction of the sleeper, the cracks caused by the back cracks of the veneers are almost evenly distributed inside the sleeper. A wooden sleeper is formed by forming a sleeper main body made of laminated veneer wood, and impregnating the sleeper main body with a preservative through the cracked part of the back of the veneer.