EP0875626B1 - Understructure of a double track railway with middle core renewal - Google Patents

Abstract

On the structural limit a temporarily effective support structure is erected, which acts as build-up when the second track is installed. This support structure is formed by reinforced soil, and to it is fixed a ballast retainer. In front of or in the support structure a drainage arrangement and/or supply conduits are installed. The drainage arrangement has a stable form, and is produced as a frame (5). The temporarily effective support structure is preferably formed as geoplastic reinforced soil. The deep drainage arrangement with frame walling is installed centrally. The frame (5) is quadratic in cross-section, e.g. 0.50 x 0.50 m and approximately 3m long.

Description

The invention relates to the basic construction of a railway system with central core shoring, the Application is especially for slow travel routes in the course of maintenance offers double and multi-track routes.

A formation and frost protection layer is often used to maintain railway lines installed under the track ballast. When installing this protective layer Two-track and multi-track routes are usually initially a track, the track 1, dismantled and drive on the other track (track 2). To secure the track 2 a middle core shoring is necessary in the dismantled state of track 1. The central core shoring is expensive according to the prior art as sheet pile or designed as a screed wall and is generally in the path axis. At the Installation and dismantling of such a center core shoring is the blocking of the operating track necessary. The space required for the technology to be used compels to this - often organizationally and technically complex - Measure. There is also the dismantling of the previous solutions, especially at that of the girder screed walls, a considerable risk to the stability of the tracks. Another disadvantage is the loosening of the beams or the sheet piles surrounding soil and the resulting track elevations and higher Wasserwegigkeiten.

In particular, from DE 43 41 418 A1 a proposal is known which stimulates for the Renovation of railway track systems using a sliding knife shoring, the ditch formed by clearing the substructure of the old track only and with the progress of the renovation work in the direction of the to be renewed Track body of the old track wanders. The sliding knife shoring should do this the side knives securing the trench walls as well as supporting ones on the bottom of the trench Have floor knives with a hydraulic knife cylinder Support frame of the knife shoring are coupled. Knife shoring is preferred from a lead frame and a secondary frame.

The invention thus uses the sliding knife shoring, which is a principle Known for the knife-layer tunnel distribution, but also for the trench distribution is. The associated technical expenditure is also considerable.

The aim of the invention is to reduce these disadvantages of the prior art at low cost remove. The task here is to develop a central core shoring, its System can be used across tracks. This object is achieved through the features of the claims 1 and 5 solved.

For this, the central core shoring is carried out so that the construction limit lies outside the pressure range of the traffic loads of the operating track and on this a temporarily effective support structure is erected, which then Construction of the second track acts as a shoring. The supporting structure preferably consists of geosynthetic reinforced earth. At this center core shoring from reinforced earth can a gravel mount must be attached. If central drainage is necessary are these introduced according to the invention in front of or in the support structure; the same applies to supply lines. The deep drainage, e.g. B. executed as gabions prefers a stable form, so that it is an additional abutment of the central core shoring forms. In addition, the stable shape allows the construction of the formation and Frost protection layer of track 2 a clear separation of different materials, namely between the filter material of the deep drainage and the base layer material the formation / frost protection layer. At the same time, it ensures that the formation / frost protection layer of track 2 is installed against a fixed abutment can be, which ensures a high quality of installation.

The invention can be of basically the same design even in the case of multiple tracks Find routes application.

With such an arrangement, the disadvantages described above are the previous used technical means completely eliminated.

This also applies to avoiding structural separation along the subsurface the shoring wall by shoring elements (girders, sheet piles) remaining in the floor. In addition, the invention has the particular advantage that the possible integration of horizontally continuous, transverse to the shoring Tension members the stability of the entire track body is sustainably increased. In addition, the solution according to the invention compared to the prior art is much cheaper.

The invention is described below using two exemplary embodiments (FIGS. 1-4) and the representation of the basic construction phases (Fig. 5; 6) explained in more detail. moreover An embodiment variant of the design of the support system (Fig. 7) is disclosed.

Fig. 1 shows the invention including deep drainage with gabion wall; Details of this can be found in FIG. 2. It can be seen that the wall of the Temporary support structure 1 - preferably made of geoplastic reinforced Earth - outside the pressure range of the traffic loads - cf. Pressure propagation line 2 according to service regulation 836 of Deutsche Bahn AG. The deep drainage 3 with gabion wall is inserted in the middle; the formation protection layer In the exemplary embodiment, 4 has a gradient of 5 percent. The gabions 5 is square in cross section, e.g. B. 0.50 x 0.50 m and about 3 m long. she is lined with nonwoven fabric 6 and contains this in the gravel sand 7 (preferably 2/16) horizontal drain pipe 8 (DN 200). The space between support structure 1 and gabions 5 (distance approx. 0.1 m) is also filled with gravel sand 7. The support structure 1 is wedge-shaped. The lower integration length of the reinforcement textile is 9 approx. 1 m; above it is about friction within the formation protection layer 4 involved. The reinforcement textile 9 is also by floor nails 11, which are introduced at a distance of approx. 1 m. The wall of the support structure 1 is from the beginning and permanent via a stabilizing basket 12 from a reinforcing steel bearing mat using stabilizing bar 13 (also 1 Pieces / meters).

In Fig. 3 is an embodiment of the invention with an off-center deep drainage 14 shown; Details are shown in Fig. 4. The essential to the invention The structure of this variant is basically analogous to that described above. Dispensing with the stable gabion wall requires a larger one Technological care in the design of this drainage, on the other hand, is eliminated the cost of the gabion elements.

1. Einbau einer Schotterhalterung 15 und Rückbau von Gleis 1 und seiner Schotterbettung.

2. Abschnittsweise Bodenaushub und Herstellung des Erdplanums- sowie abschnittsweise Herstellen, des bewehrten Erdkörpers in der Planumsschutzschicht.

3. Herstellen der Planumsschutzschicht 4 und Herstellen einer Rückverankerung 16 der Schotterhalterung. Fig. 6 erläutert die Bauphasen 4 ff. bis zur abschließenden 6. Bauphase:

4. Neubau von Gleis 1 und seiner Schotterbettung 10; Rückbau von Gleis 2 und Schotterbettung; abschnittsweise Bodenaushub und Herstellen des Erdplanums; abschnittsweise Herstellen der Tiefenentwässerung 3 mit Gabionenwandung 5.

5. Verfüllen des Zwischenraumes zwischen Wandung der Tiefenentwässerung 3 und Planumsschutzschichtwandung von Gleis 1 mit Kiessand 7; Herstellen der Planumsschutzschicht im Gleis 2.

6. Abschnittsweise Rückbau der Schotterhalterung; abschnittsweise Herstellen der Schotterbettung im Mittelbereich; abschnittsweise Herstellen von Gleis 2 und seiner Schotterbettung.

5 shows the first three construction phases for the first embodiment variant of the invention disclosed in FIGS. 1 and 2:

1. Installation of a ballast bracket 15 and dismantling of track 1 and its ballast bed.

2. Sectional excavation of the soil and production of the earthen level as well as sectionwise manufacture of the reinforced earth body in the formation protection layer.

3. Production of the formation protection layer 4 and production of a back anchoring 16 of the ballast holder. 6 explains the construction phases 4 ff. To the final 6th construction phase:

4. New construction of track 1 and its ballast bed 10; Dismantling of track 2 and ballast bedding; Sectional excavation and construction of the earth level; Sectional manufacture of deep drainage 3 with gabion wall 5.

5. Filling the space between the wall of the deep drainage 3 and the formation protection layer wall of track 1 with gravel sand 7; Creating the formation protection layer in track 2.

6. Sectional dismantling of the ballast holder; manufacture of the ballast bedding in sections in the central area; Sectional manufacture of track 2 and its ballast bedding.

An embodiment variant of the design of the support system is shown in FIG. 7.

Claims (5)

1. Foundation engineering for a two-track railway installation with a centre-core lining, whose set-back line lies outside the zone of pressure of the traffic loads (2) of the operational track and is provided with a temporarily effective bracing structure (1), which acts as shoring for the construction of the second track, whereby the bracing structure comprises reinforced earth, to which a ballast retainer (15) is affixed to retain the ballast of the first track.
2. Foundation in accordance with Claim 1, whereby drainage (3, 14) and/or supply lines are placed in front of or in the bracing structure (1).
3. Foundation in accordance with Claims 1 and 2, whereby the drainage (3, 14) possesses a stable form.
4. Foundation in accordance with Claim 1 to 3, whereby the drainage (3, 14) is designed as a gabion (5).
5. Procedure to construct a centre-core lining for railway installations in accordance with Claims 1 to 4, whereby, starting from the affixing of a ballast retainer (15) and dismantling of track 1 and its ballast bed (10), step-by-step excavation and creation of the earth subgrade alongside step-by-step creation of the bracing mass (1) in the protective layer of the subgrade as well as creation of the protective layer of the subgrade (4) and re-anchoring (16) of the ballast retainer (15) follow, and then the new construction of track 1 and its ballast bed (10), the dismantling of track 2 with ballast bed and the step-by-step creation of the drainage (3) can be performed, to be followed by filling of the intermediate space between the wall of the drainage (3) and the wall of the protective layer of the subgrade of track 1 with gravel sand (7) and creation of the protective layer of the subgrade for track 2 and finally step-by-step dismantling of the ballast retainer, creation of the ballast bed in the centre area and installation of track 2 and its ballast bed.

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