RU2374392C1 - Method for stabilisation of embankment with retaining structures from steel corrugated sheets - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention is related to methods of earth bed stabilisation, namely to methods for stabilisation of railway embankment. Method for stabilisation of embankment with retaining structures from steel corrugated sheets, in which steel corrugated sheets are submerged at least from one field side into soil within the limits of verge. Submersion is carried out vertically at the angle to longitudinal axis of embankment, in process of submersion, ruptures are left between corrugated sheets, corrugated sheets on top are combined with links. In areas of ruptures, vertical enclosure is installed to links, which retains soil and provides for verge of required width in this area.

EFFECT: improved stabilisation of embankment along the whole height of earth bed, higher efficiency of works on stabilisation of embankment in process of machined performance of operations for arrangement of retaining structures, widening of embankment on top with provision of verge of required width.

2 cl, 4 dwg

Description

The invention relates to methods for stabilizing the subgrade, and in particular to methods for stabilizing a railway embankment.

The prior art method of strengthening the slopes of a bulk earthworks, described in the copyright certificate SU 773204 A1, 10.23.1980. In the known method, the body of the structure is compressed by collapsible elastic bonds, the ends of the elastic bonds are anchored into plates, which are laid on the base on both sides of the earth structure before its construction. However, this method of stabilization of the embankment is a preliminary measure to ensure stabilization of the embankment and does not allow stabilization of the existing embankment.

The prior art device for holding the soil slope of the embankment from shear, described in the copyright certificate SU 996637 A1, 02/15/1983. The known device implements a method of stabilizing the subgrade, in which a pile is installed in the soil of the base of the embankment with the upper and lower screw blades placed on it. However, this method of stabilization of the embankment does not provide the necessary stability coefficient.

The prior art device for strengthening slopes, described in the copyright certificate SU 1578263 A1, 07/15/1990. The known device implements a method of stabilization of the subgrade, in which the beams or plates laid on the surface of the slope are rigidly combined with piles hammered into the base of the slope, by combining at the welding outlets of the reinforcement of the beam or plate and piles and monopolizing the joint, and along the length of the beam or plate cover a potentially unstable slope zone. However, this method of stabilizing the embankment is local and also does not provide the necessary stability coefficient.

As a prototype adopted coating slopes of hydraulic structures, described in the copyright certificate SU 1147814 A1, 03/30/1985. The known device implements a method of stabilizing the subgrade, in which a rigid tooth-shaped insert is installed in the plate opening, the longitudinal axis of which is parallel to the axis of the plate, and an elastic corrugated sheet coaxially with the longitudinal axis of the insert, the axis of the tooth cavity coincides with the vertical axis of the insert, and the ends of the sheet are anchored into the body of the insert, while the corrugated part of the sheet is enclosed in a protective shell filled with a viscous liquid. However, this method of stabilizing the embankment is tied to the slope cover, since the corrugated sheets are inserted into the openings of the slab performing the function of covering the slope.

The task to which the claimed invention is directed is to stabilize the embankment along the entire height of the subgrade by preventing the slopes from slipping and sliding to achieve the necessary value of the stability coefficient (the ratio of the calculated values of the holding forces to the calculated shear forces).

The claimed invention provides technical results aimed at improving the stabilization of the embankment along the entire height of the subgrade, to increase the productivity of stabilization of the embankment during the mechanized execution of operations on the device of retaining structures, to broadening the embankment along the top to ensure the curb is of the required width.

The method of stabilizing the embankment with retaining structures of steel corrugated sheets according to the invention is that the steel corrugated sheets are immersed from the field side (s) into the soil within the curbs by vibrating on said sheets, immersion is carried out vertically at an angle to the longitudinal axis of the embankment, between the sheets they leave gaps, the corrugated sheets are joined together by ties, in the places of gaps to the ties, a vertical fence is installed that holds the ground and provides m place the roadside of the required width.

Figure 1 shows a diagram of a corrugated element (sheet).

Figure 2 - diagram of the corrugation of 150 × 50 mm

Figure 3 - diagram of the retaining structure, where:

a) profile

b) a plan with the arrangement of sheets after 3 m (option 1),

c) a plan with the arrangement of sheets after 5 m (option 2),

1 - corrugated sheet

2 - connection of sheets on top.

Figure 4 - diagram of the retaining structure with a double row of corrugated sheets, where:

a) profile

b) the plan

1 - corrugated sheet

2 - connection of sheets on top.

Galvanized steel corrugated sheets, interconnected by bolts, are fixed in the vibrator of the machine to immerse the foundations of the supports of the contact network. Before immersion, the corrugated sheets are oriented vertically at an angle to the longitudinal axis of the path, then the corrugated sheets are immersed in the ground to the required depth, determined by calculation.

The stability of the exploited embankments is calculated taking into account the features of the formation of the deformation zone:

1) the presence of cracks at the field ends of the sleepers and the repose of the slope with a practically vertical separation wall of up to 2-3 m along the ballast bed;

2) loss of stability of the ballast loop.

In accordance with this, the design schemes for checking stability provide for the displacement of the unstable part of the embankment, respectively:

1) along the broken surface of the slip;

2) on the sole of the ballast train.

The top of the corrugated sheets is placed outside the range of the working bodies of the track machines, the corrugated sheets at the top are joined together by ties, in the places of gaps between the sheets, if necessary, they arrange a vertical fence and fill these places with soil to expand the embankment at the top and create a curb.

In retaining structures, corrugated elements are used - galvanized steel sheets. The size of the sheets is 1800 × 2000 × 5 mm (Fig. 1). The weight of one corrugated sheet of the specified size is 180 kg.

For corrugated sheets use steel grade 09G2 GOST 17066-94. This steel can be used at a temperature of - 50 ° C.

Corrugations with a size of 150 × 50 mm are made in accordance with figure 2.

Holes are arranged in the sheets, the sheets are joined together by an overlap. For the connection, fastening parts are used: the M20 bolt and the M20 nut with a special flat-spherical washer.

The minimum thickness of the zinc protective anti-corrosion coating of the sheets is 80 microns.

Mounting details are galvanized, the coating thickness is 26-30 microns.

For connections between corrugated sheets in a retaining structure, a channel with a height of at least 200 mm is used. It is allowed to use rails of a type not lower than P43 that are unsuitable for laying in the path.

To backfill the retaining structure in order to broaden the main site, sand (medium-sized, large, gravelly), sand-gravel or crushed stone are used.

Corrugated sheets are immersed when holding structures are installed using the MS-1 machine for vibration dipping of pile foundations of contact network supports.

Immersion is carried out using a machine vibrator, in which a corrugated element immersed in the subgrade is fixed (instead of the foundation of the support).

To fix the corrugated sheets in the vibrator of the MS-1 machine, a device is used that is clamped in the lower part of the vibrator using hydraulic jacks. It is made of P65 rails, steel sheets and a corner.

The holding structures made of corrugated elements arranged to prevent and eliminate emergency methods of embankment slopes, increase their stability and bring the geometric dimensions to normalized values, are performed in accordance with the following requirements.

The holding structures on the embankment are arranged according to the scheme indicated in FIG. 3. If it is necessary to ensure the stability of slopes on both sides of the embankment, a similar design is provided on the other slope.

The corrugated sheets in the holding structure are positioned at a distance of 3 m from each other in the first embodiment and at a distance of 5 m in the second embodiment (FIG. 3).

The holding structure according to option 1 should be arranged with a stability factor K <1.2 and according to option 2 with 1.2≤K≤1.3.

Corrugated sheets are placed at an angle of 20 ° to the longitudinal axis of the path. The distance from the axis of the path to one edge of the corrugated sheet is 2.8 m and to the other 3.4 m. If necessary, this distance can be increased and taken equal to 3.3 and 3.9 m, respectively.

The top of the corrugated sheets is placed 0.45 m below the base of the sleepers to enable the operation of track machines. From the specified level, the sheets are immersed to the required depth.

Corrugated sheets in a retaining structure are combined on top with bonds that are located at the edges of the sheets (structure). For connections use channels or rails unsuitable for laying in the path, which are combined with sheets.

Depending on local conditions (the width of the curb, the steepness of the slope), instead of one of the longitudinal ties shown in Fig. 3, arrange ties between the nearest edges of two adjacent sheets. The connection of the bonds with the sheets is carried out using two reinforcement rods with a diameter of 20 mm, passed into the hole in the upper part of the sheet and welded to the bonds. These two rods are additionally interconnected by two other reinforcement rods.

If it is not possible to immerse the corrugated sheet to the required depth, this sheet is removed from the ground and immersed in place of the next sheet in order.

The dipping of corrugated sheets is carried out by orienting the corrugations vertically.

The length of the site of stabilization of the slopes of the embankment with retaining structures is established according to the engineering-geological survey. The design is arranged within a deformable (unstable) area and beyond 20 m on each side.

If it is not possible to ensure the stability of the slope due to one row of retaining structures, determined on the basis of the calculation and the data of an engineering-geological survey, a second row of these structures is assigned, providing for a distance from the track axis to the edges of the corrugated sheets equal to 5.4 and 6.0 m ( figure 4). At the same time, the top of the corrugated sheets is placed at the level of the slope or above its surface, but not lower than 2 m from the level of the rail head. The closest to the path a number of corrugated sheets are placed in accordance with the scheme (figure 3), where the distance from the axis of the path to the edge of the sheets is 2.8 and 3.4 m.

Restraining structures arranged to broaden the subgrade on top are prescribed at a distance of less than 3.4 m from the path axis to the edge.

Within the holding structures, they are covered with sand, sand and gravel or crushed stone.

Thus, when using the claimed invention, the stabilization of the embankment along the entire height of the subgrade is increased, the productivity of stabilization of the embankment is increased, and the roadside of the required width is provided.

Claims (2)

1. The method of stabilizing the embankment with retaining structures made of steel corrugated sheets, in which the steel corrugated sheets are immersed from at least one field side into the soil within the curb, immersion is carried out vertically at an angle to the longitudinal axis of the embankment, leaving gaps between the corrugated sheets when immersed , the corrugated sheets at the top are joined together by ties, in the places of breaks to the ties, a vertical fence is installed that holds the soil and provides a roadside of the necessary width in this place. 2. The method according to claim 1, characterized in that the corrugated sheets are immersed by vibrational impact on said sheets.

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