DE583186C - Railway body, consisting of several rockfall layers built up on a bed of sand or slag - Google Patents

Description

Railway body consisting of several on a sand or slag bed The purpose of the invention is to use rockfall layers to create a solid and steadfast railroad body, which with appropriate Resilience a secure storage of the sleepers and protection of the superstructure and of the moving goods, as well as requiring only low maintenance costs.

This is related to a peculiar compaction of the bedding achieved with a lower, pressure-distributing sand or slag layer, that the stone elements, which are laid in layers, with pulped hard-grained Building material (for example stone cast) are completely filled and about the compacted in this way Bedding at the level of the lower edges of the sleeper is a leveling layer of stone gravel is applied, on which the sleepers rest directly.

There are already efforts to achieve a more or less compacted bedding known. It has been proposed to use an intermediate layer in the case of roller beds to use from stone chips mixed with fine gravel or sand. On the other hand was in the previous manner from rockfall layers (without filling in the gaps) A compensating gravel layer is applied as the topmost layer on roller beds. Even it is known to gradually go from coarse to fine in order to avoid slackening To transfer packaging material, as well as the gaps to achieve a better hold to tangle with the coarser packing stones.

But it is neither intended nor intended for all the prior publications realized, a completely solid immovable bearing of the sleepers to produce by the fact that the stone gravel in the construction of the bedding purposefully and on technically correct way brought into the spaces between all bedding elements as a result of which - in contrast to the previously generally followed for bedding construction Principles - the gaps in the entire cross-section of the bedding completely and rammed into place fill out.

However, this cannot be done by mixing the ballast beforehand with fine building material, especially when rolling in high layers Achieve subsequent pouring of grus, since this in the open lower Joint sinks.

It is therefore according to the invention after spreading the lower sand or slag = bottom the rockfall bed is made in layers and for the individual layers a stone chipping of the same grain size as possible, the stones are laid next to each other in only one row in each layer; after applying one layer of stones each, this is sprinkled with stone gravel and so on long stomped up all Gaps are completely filled; thereon the next layer is applied using the same process, etc.

As stated, the individual layers should be made of gravel stones of the same size can be used. The successive layers can however stone elements of different (upwardly decreasing) grain size in layers contain. It is important that the gaps are always properly filled so that all stone elements are secured against loosening like in a masonry, whereby but the bedding constructed in this way is not impermeable to water or air will be, so in no way forms a rigid base. The suspension is by the way also increased by the use of the lower sand sole. .

On the plan, which is covered according to the drawing initially a sand or slag layer z advantageously 15 to 20 cm thick, which is tamped down. The gravel stone layers are then so thin on this Spread out as possible and each one with stone gravel or other hard-grained material Building material pulped. All layers are parallel to the slope of the subgrade and are therefore too sloping towards the sides of the embankment. It can depending on If necessary, two or more layers of stone can be applied. Two layers each, ollen but advantageously consist of stone elements of the same size. In the illustrated embodiment are the two lower layers 2 and 3 and the two upper layers 4 and 5 different strengths. At most, a thin compensating layer 6 is sufficient at the top Stone gravel, the upper surface of which is horizontal at the level of the lower edges of the sleepers 7 lies. In this way <the hitherto customary knocking down (staples) of the sleepers, whereby these are easily damaged without a secure and even support could be achieved, avoided.

In the embodiment shown, the two lower layers are off each 7 to 8 cm thick and the two other layers each 3 to 4 cm thick Gravel stones thought. The thresholds are then placed on the compensation layer 6 7 and after the bedding has solidified sufficiently and any differences in height at individual thresholds are balanced by an underfill of grus the sleepers in the gaps and in front of the head with a gravel of advantageous small grain size, which is also applied in layers and each Stone layer is tamped down with grus.

In the case of the bedding produced in this way, on the one hand the penetration of larger amounts of water and the formation of so-called water sacs inside or below the bedding, so that the substructure does not soften and sinking of the lower stones cannot occur, and on the other hand it is achieved that the sleepers receive a completely uniform, unchangeable support and, since the upper gravel layer cannot sink into the compacted bedding, never be able to come into contact with the coarse gravel stones, which was previously the case with Wooden sleepers can erode and, in the case of concrete sleepers, the edges break off Had a consequence.

The railway maintenance costs are also fixed, wall-like with this one Bedding is reduced considerably and it is therefore also due to the better storage considerable protection of the superstructure achieved. In addition, the more solid the substructure, the more effective are the anti-migration agents used and the more it becomes The rails can be welded together over great lengths.

The dimensions of the individual parts of the bedding are chosen so that that the threshold pressure is completely and evenly transferred to the substructure. Experience has shown that the pressure transfer takes place in a normal ballast bedding according to an angle of about 60 ° while a layer of sand transfers the pressure below about 450. It is justified to assume that with the solidified ballast bedding according to the invention, the pressure transfer even in gravel is significantly cheaper (smaller than 6o °) will be. It follows that especially when using a strong Sand sole required a significantly lower overall height for the ballast bedding is more than with the previous design to ensure an even load on the substructure to achieve. It is therefore not just about work, but also about building material, namely in significantly expensive stone building material, saved. The time required for the after all great Construction requiring care is therefore made by the savings achieved and especially amply outweighed by the great steadfastness of salvation.

Claims (1)

PATENT CLAIMS: i. Track body, consisting of several on one Rockfall layers built up in a sand or slag bed, characterized in that that each layer on the subgrade consists of only one row of falling rocks, that the gaps between the stones of all layers with pulped granular Building material (e.g. stone gravel) are completely filled in and on the top layer a compensation Layer of stone gravel is applied on which the thresholds lie. z. Track body according to claim r, characterized in that those on the sand or slag bed, which are covered according to the planum, are parallel laid the lower layers from a row up to 8 cm thick and the upper layers consist of a row of 3 to 4 cm thick gravel stones, each stone grater especially tamped with stone gravel or the like and over it an approximately 2 cm thick Leveling layer of grus is applied while backfilling the on top of this Leveling layer laid rail sleepers made of plenty of grus and there are also layers of pounded rockfall.