EP1496161A1 - Method to stabilise the traffic route - Google Patents

Abstract

A cost effective and rapid method for preparing a roadway for road or rail excavates two or more slit trenches along the line of the road and mixes the excavated material with cement and other material and refills the trenches to form vertical support walls (3). The invention extends the process by using the excess material from the trenches, mixed with cement and other materials, to form a covering bed (4) over the tops of the walls. The covering bed can be laid onto a sand layer (2) and forms a rigid structure with the vertical walls. The final roadway is laid onto the covering layer.

Description

The invention relates to a method for Stabilizing a floor for a traffic route, like a Road or a railway line, with one being Soil cultivation device in the path direction at least a grave-shaped path by loosening the soil material and Mixing it with a stabilizing agent is processed, whereby in the direction of a reinforced track Bottom wall is formed.

Such a method is from the German patent application 195 42 031 and Dutch Patent Application 1010451 known. Using such a procedure can be opposite a conventional, time consuming process with a poured sand bodies in areas with less load-bearing Soil like loam / peat soil relatively quickly becomes a traffic route be formed. A heaped sand body requires a long settlement wait before the road can be completed while rest relative require a lot of maintenance. With bottom walls can a Not only be completed faster, but it also creates a low-setting Construction and thus a reduction of the required Maintenance work.

Stabilization through the bottom walls is achieved by dissolving the dissolved soil material with the Stabilizing agent whose main component is cement, mixes, and its volume according to the Dutch Patent Application 1010451, for example 10 to 25% of the volume may amount to the dissolved soil material. After mixing Therefore, the volume of the mixture is greater than the volume the trench-shaped path. The additionally formed volume becomes removed as excess material, including in the Device according to Dutch Patent Application 1010451 a special discharge system attached to the mixing chamber has been. After the completion of the floor walls extend these, as indicated in German Patent Application 195 42 031, in Path direction under the path to be created or the to be created railway line.

With the invention, a further improvement, especially strengthening, stabilization of the soil intended.

This is according to the invention in a method reached in the manner described at the beginning by Path direction at least two bottom walls are formed, which extend mainly parallel to each other, wherein as a result of the addition of the stabilizing agent to the Soil material emerging from the trench-shaped track Mixture between and above the bottom walls is leveled one layer with another Soil cultivation device is processed such that this layer is one unit with the upper ends of the bottom walls forms. With these measures are two each next to each other lying bottom walls to a monolithic, inverted U-shaped Ground profile with both vertical and connected horizontal load distributing effect, wherein In addition, the connection of the vertical parts with the horizontal part is moment-fixed, whereby both the Load transfer and thus the carrying capacity of the road is further promoted to the bottom walls, as well as a stable and stable construction is obtained. In addition there is the additional advantage of using these effects one considered previously superfluous and therefore be achieved to be transported away excess of mixture, which is a direct and inevitable consequence of the way is where the bottom walls are made.

In the above mentioned will have at least two bottom walls spoken. As purely illustrative, not restrictive Embodiment will further be a construction for Wearing a lane with two lanes and one Hardening width of 7.5 m discussed, including in Path direction four bottom walls are attached and actually the talk of a compound, monolithic, reversed U-shaped bottom profile is. Because of Short version will continue to receive the various Forms of execution of the floor profiles as tunnel profile designated. In the above, similar cases can according to a further embodiment of the invention it is preferred that the leveled layer be protruding extends past an outboard bottom wall. Then In each case a bottom wall would be mainly vertical under an expected lane of a wheel loading the road extending over the road vehicle.

Depending on the desired thickness and thickness of the layer, which connects the bottom walls to a tunnel profile becomes according to a preferred embodiment of the invention provided or not provided that on the leveled Layer another layer consisting of a mixture of Sand, cement and any other additions attached becomes; this extra layer is leveled with the Layer mixed during processing. Thus, always is to realize exactly the desired layer thickness and thickness.

To optimize the bonding of the leveled layer with the floor walls to a tunnel profile is corresponding to a another embodiment of the invention that the Attach the bottom walls to a subfloor of a layer of sand attached, which in the processing of the leveled Layer at least partially with the leveled layer is mixed. So is a particularly intense, as well Controlled connection of the leveled layer with the upper ends of the bottom walls, which are initially in the Sand layer enough to realize and thus optimal Load capacity for the tunnel profile.

Before completing the traffic route to the Curing the formed tunnel profile is provided that on a monolithic construction thus obtained, consisting from at least two bottom walls and one, this at their upper ends connecting and covering layer, more Cover layers are attached. One can at Asphalt layers with or without at least one underlayer from mixed granulate or a railroad track with rails and Think of sleepers with or without a lower class.

Particularly effective one can proceed, if the Operation of dissolving the soil material in one trench-shaped path and mixing of the dissolved Soil material with a stabilizing agent with a Milling lance is executed, which in a more or less oblique stand is stuck in the ground and then the Processing of the leveled layer and a possible on or below attached layer with a milling roller whose axis line is mainly parallel to Surface of the road to be formed runs.

With reference to one in the drawing, if only as non-limiting example, illustrated embodiment The method according to the invention will now be explained in more detail. The simple illustration of the drawing in Cross section of a road construction using the procedure made according to the invention, wherein the left part of simple picture partly an intermediate phase during the Manufacturing and the right part the finished Road construction shows.

The construction shown in the simple figure forms a two-lane road with a complete hardened width of about 7.5 m and to the opposite Sides a half-hardened roadside of about 2 m. For the Production of such a road was done as follows.

Starting from the original Erdoberkante 1 was a Layer soil material of about 200 mm dug, taking dug grass and topsoil laterally along the planned route were taken. In the excavated part was then a, an underbody forming sand layer 2 of about 200 mm poured. With a cutting lance were then in the path direction four bottom walls 3 formed. Under a cutting lance understand we have a tillage device with the appearance of a Chainsaw with above-average dimensions, so one elongated frame, which has a width of several dozen Centimeters and a length of several meters can have to a bucket wheel chain is running. The paddle wheels are like that Shaped that the soil material is not like at An excavator machine is dug, but is solved. the So soil dissolved in a trench-like orbit will then, for example, ah different injection sites along the Framework, a stabilizer added in suspension. Main component of the stabilizing agent forms For example, cement, but also any other suitable Additive or a combination of materials. The Shape of the paddle wheels is still chosen so that not only the soil material is dissolved, but also dissolved Soil material and stabilizer added intensively be mixed. By the lance in the direction of the line is moved, so is an uninterrupted bottom wall 3 with for example, a depth of about 7 m and a width of 0.35 m formed, the center distance of the two adjacent floor walls 3 is about 2 m.

By adding the stabilizing agent to the dissolved soil material and mixing it with it, a mixing amount is obtained which is greater than the soil dissolved in a trench-like path. If the additional amount obtained, which can not be accommodated in the bottom wall 3 and thus emerges from the subfloor formed by the sand layer 2, is about 20%, this means that in the present case an excess of about 2m ³ / m road is formed , This excess is distributed over a width of 11.5 m, ie the intended roadway with semi-hardened roadside, which results in a leveled layer 4 with a thickness of about 170 mm. On this leveled layer 4, a sand layer 5 is then applied to a height of about 300 mm above the original top of the earth 1.

The resulting layer structure with a height of approx. 500 mm is shown in the left part of the simple figure. These layers are using a roller cutter with each other mixed. Under a rotary mill we understand one Soil cultivation device, with the at least one horizontal material layer intensively mixed and can be homogenized. As in the left part of the simple Figure can be seen, the bottom walls 4 with their upper ends to the sand layer 2 and are therefore at Editing the layer structure with the tiller taken, so that the obtained, intensively mixed, horizontal layer 6 (see the right part of the simple figure) after the Curing together with the bottom walls 4 a one-piece, strong, torque-stable, stable and stable monolithic Basic body forms, consisting of a horizontal, stress-distributing layer, that of four, one unit thus forming vertical stress distribution layers is supported.

It is noted that the width of 11.5 m in the Generally not in a single time with a roller cutter, which is moved in the direction of the train, can be edited. The mixer or Stabilization process is then commonly found several tracks instead. The positions of the Bottom walls 4 in terms of overlap between different tracks an important focus, in particular Such an overlap preferably does not have to be at the Place a bottom wall 4 are located.

Having in this way the rather than tunnel profile to be designated body was realized, it will be one Layer 7 of mixed granules with a thickness of about 250-340 mm attached and then a layer 8 from Lightweight asphalt with a thickness of about 80 mm with it a layer 9 of lightweight asphalt having a thickness of about 60 mm. By laterally stuffing with earlier graved topsoil and grass become the roadsides 10 completed. Then the path construction is completed, by an approximately 30 mm thick, sound-absorbing cover layer 11 is attached.

Of course, within the framework of the Invention from the appended claims still many changes and variants possible. First it must be repeated that the mentioned above and shown in the picture Embodiment is illustrative only. So can more or There are less than four floor walls, it is possible to remove one or both layers of sand or this Add or not add other substances. Of course, the dimensions given are also not restrictive and varied in many ways. The same thing applies to the shaping of the tunnel profile. So can the Floor walls spread less regularly across the width of the floor Tunnel profiles are attached, depending on the application. The latter can also be a railway line, in which case the Processing of the tunnel profile is adapted to this purpose. Also, the bottom walls seen in the direction of the line one of have a different shape from a flat plane for example, zigzag or wavy stretch. Furthermore, the number of floor walls under the entire Traffic not always be the same. So, in places over a certain distance one or more additional Floor walls are being built. Also, depth and thickness of the Floor walls vary with each other or in the path direction. This also applies to the thickness and width of the bottom walls flattened to a one-piece tunnel profile Layer that can also project beyond the outermost floor walls or not. The overhanging can also be one-sided and the Width of the overhang can be along the road to change.

Claims (7)

Method for stabilizing a ground for a traffic route, such as a road or a railway line,
wherein at least one trench-like path is processed by means of a ground-working device in the path direction by dissolving the ground material and mixing it with a stabilizing agent, whereby a reinforced bottom wall is formed in the direction of the path,
characterized in that in the path direction at least two bottom walls are formed, which extend substantially parallel to one another, wherein as a result of the addition of the stabilizing agent to the soil material emerging from the trench-shaped web mixture is leveled between and above the bottom walls to a layer with another Soil cultivation device is processed such that this layer forms a unit with the upper ends of the bottom walls. A method according to claim 1, characterized in that the leveled layer extends protruding over an outboard bottom wall. A method according to claim 1 or 2, characterized in that on the leveled layer, a further layer consisting of a mixture of sand, cement and any other additives attached; this further layer is mixed with the leveled layer during its processing. Method according to one of the above claims, characterized in that prior to the attachment of the bottom walls, an underbody made of a layer of sand is applied; This sand layer is at least partially mixed with the leveled layer during the processing of the leveled layer. Method according to one of the above claims, characterized in that further covering layers are applied to a monolithic construction thus obtained from at least two bottom walls and a layer connecting and covering them at their upper ends. Method according to one of the above claims, characterized in that the dissolution of the soil material in a trench-like path and the mixing of the dissolved soil material with a stabilizing agent is carried out with a cutting lance. Method according to one of the above claims, characterized in that the processing of the leveled layer and any layer applied thereon or below is carried out with a milling roller.

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