RU2206656C1 - Way of vertical-angular drainage - Google Patents

Abstract

FIELD: highway engineering, protection of upper part of roadbed against excessive humidification. SUBSTANCE: way of vertical-angular drainage includes migration of moisture over drainpipes. Specific feature of invention lies in that vertical-angular drainpipes filled with porous material function as drainpipes directed into body of roadbed and installed at angle with axis of horizon. Angle of arrangement of vertical-angular drainpipes, their number and diameter depend on peak of level of ground water which should be lowered and on its volume. EFFECT: preservation of existing roadbed with use of vertical-angular drainage. 4 dwg

Description

 The invention relates to the field of road construction and can be used to protect the upper part of the subgrade from waterlogging.

 A known method of using horizontal and vertical drainage to strengthen weak soils in the foundations of structures, as well as to accelerate the settlement of structures, based on the principle of moisture migration, respectively, horizontally or vertically. Pipes are laid in the ground or in the pavement cloth that change the path of moisture migration and accelerate the drainage of the soil (Tulaev A. Ya. Design and calculation of drainage devices. - M.: Transport, 1980. - 191 p.).

The disadvantage of this method of horizontal drainage is:
- drainage of only the upper part of the subgrade;
- siltation of the material of the drainage layer during operation due to thawing of moisture from the subgrade and the dynamic effects of automobile load;
- the inability to improve the drainage properties of the structure without destroying the pavement.

 The disadvantage of vertical drainage is the inability to drain moisture from the middle of the pavement without disturbing the road surface.

 The technical problem to which the invention is directed is to preserve the existing pavement when installing vertical-angle drainage.

 The solution of this problem is carried out by the fact that in the proposed method of vertical-angular drainage, including the migration of moisture through drainage pipes, according to the invention, vertical-angle drainage drains filled with porous material are made in the form of drainage pipes directed into the body of the subgrade and installed at an angle to axis of the horizon, while the angle of the vertical-angular drains, as well as their number and diameter, depend on the peak of the groundwater level, which must be lowered, and on its volume, respectively.

 The essence of the method is illustrated by drawings, where figure 1 shows a vertical-angle drainage; in FIG. 2 - docking vertical-angle drainage; figure 3 - cross vertical-angle drainage; figure 4 - mixed vertical-angle drainage.

 With the help of a drilling rig, a well is constructed at a certain angle (depending on the climatic region, the height of the road surface above the groundwater level and the category of road) and at a certain depth (below the groundwater level). A drain is installed in the well - a pipe (asbestos-cement, ceramic, concrete, plastic or from another material), the water into which flows through open joints of links or water intake openings. To prevent pipe deformation and improve moisture migration, the drain is filled with a porous material (e.g. sand).

 Vertical-angled drainage (Fig. 1) with two drains arranged on opposite sides is applied provided that there are two peaks of groundwater levels in the body of the roadbed, the level of which must be lowered.

 Docking vertical-angle drainage (figure 2) is arranged under the condition of one peak of the groundwater level.

 Cross vertical-angle drainage (figure 3) is advisable to apply in 1 and 11 road-climatic regions of Russia. This is due to severe freezing and gradual thawing of the roadway.

 Mixed vertical-angle drainage (Fig. 4) is arranged in places of abundant groundwater inflow with variable peaks in the groundwater level.

 The angle of the vertical-angled drain is determined depending on the peak groundwater level, which must be lowered. The peak can be located anywhere on the body of the pavement.

 The amount and diameter of drains depends on the amount of groundwater that needs to be diverted.

 The proposed method of vertical-angular drainage allows to accelerate soil precipitation at the base during the construction of roads on weak water-saturated soils; drain subgrade and pavement; increase the overhaul life of the road; reduce waterlogging of soils with thawed groundwater; reduce the waterlogging of the subgrade.

Claims (1)

 The method of vertical-angular drainage, including the migration of moisture through drainage pipes, characterized in that the vertical-angle drainage drains filled with porous material, are in the form of drainage pipes directed into the body of the subgrade, and installed at an angle to the horizontal axis, the angle the location of the vertically angled drains, as well as their quantity and diameter, depends on the peak of the groundwater level, which must be reduced and on its volume, respectively.

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