**7.8. Repair of metro railway (Budapest, Hungary)**

#### **Task:**

Metro line East-West in Budapest has been operated since 1970. During the operation the railway must withstand a great load. Daily operation represent passing over of 7000 wheels with axis pressure of 7,9 tons. Despite everyday maintenance, signs of damage occurred and repair works were launched.

#### **Solution:**

332 Polyurethane

**Figure 29.** Dilatation joint before the grouting

**Figure 30.** Dilatation joint after the grouting

**Task:** 

**7.8. Repair of metro railway (Budapest, Hungary)** 

Metro line East-West in Budapest has been operated since 1970. During the operation the railway must withstand a great load. Daily operation represent passing over of 7000 wheels A new method of repair of the concrete sleepers was proposed based on anchoring and use of PU resin. The performance of the works concurrently led also to stopping of water inflows from the subsoil of the railway. Concrete sleepers were stabilized and anchored without the necessity to replace them (Figs 31,32).

Grouting works were performed between 2005 and 2006, mainly during night time and without necessity of putting the metro out of operation. Total of 2842 anchors were made of the following parameters: length of the anchor 500 mm, diameter of the anchor 18 mm, diameter of borehole 25 mm, grouting material Supermin® with reaction start of 2 minutes. Further, total of 2430 grouting boreholes were drilled of the following parameters: borehole diameter 14 mm, length up to 1 m, length of inserted steel bars up to 600 mm, diameter of the bars 8 mm, grouting material Geopur® 082/1000 with reaction time 2 minutes.

**Figure 31.** Detail of the grouting works

**Figure 32.** View of the railway after repair works

In addition, water infiltration from below of the railway was stopped in a total length of 58 m of the metro tunnel using material Geopur® 082/350.

Applied methods proved to be very effective and did not disturb the regular operation of the metro line.

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