Construction of earth roadbed

FIELD: road building.

SUBSTANCE: invention can be used to strengthen weak base, increase strength and load-bearing capacity of roadbed. Proposed construction includes earth roadbed with shoulders and slopes, support longitudinal trench filled with material arranged in earth roadbed with geosynthetic material placed over top of trench. Longitudinal trench arranged along axis of earth roadbed or several longitudinal trenches are made with width of 0.6-10 at depth of 1.2-2.6 m filled with friction material, and geosynthetic material with minimum breaking strength of 15kN/m in longitudinal direction and of ≥ 20 kN/m in cross direction is placed over top of trench with back lapping into embankment providing formation of semiholders from two sides of earth roadbed.

EFFECT: improved service characteristics of road, increased time between repairs owing to elimination or reduction of sagging of earth roadbed base.

2 cl, 2 ex, 4 dwg

 

The invention relates to the field of construction and can be used to amplify weak base, increase strength and bearing capacity of the subgrade.

Known design subgrade arranged in a line on the ground. In a typical building constructions, products and sites series 503-0-48 .87 "roadbed public roads" from 1987, p.15-20 presents examples of typical transverse sections. This transverse profile works well on solid associated soils. However, on soft soils gradual deformation of the Foundation subgrade, therefore, produce reinforcement lower part of the subgrade geotextile [p.45-48, ibid].

Known design subgrade in thawed soils, floodplain grassland and wetland landscapes with application to reinforcement geotextile in the fixing half-clamp. Under the ballast prism is placed geotextile. The geotextile is placed in the base of the subgrade at the leveled sand layer, which is in the process of dumping is immersed in a weak Foundation soils and gives a draught of 0.2-0.4 m [Manual on design of subgrade and drainage roads and Railways industrial enterprises (SNiP 2.05.07-85). M: Stroiizdat. p.44]. However, the use in the base of the subgrade geotextile I have is ineffective when applied to other weak soils and in connection with the development of the currently more advanced and high-strength geosynthetic materials.

A known design of strengthening the weak base subgrade (patent 97106524/13 from 10.06.99). In this case, closing the drawers the rectangular shape of the metal mesh gabions, filled with soil and placed in the base that prevents the sediment of the subgrade. However, this method of strengthening the Foundation of the subgrade is not always sufficient for existing vertical stress on the subgrade and vehicles, as well as the condition of the soil, and therefore is sediment in the Central part of the Foundation subgrade. This promotes rapid formation of deformations on the surface of the pavement and the destruction of the roads.

The technical task to be solved by the invention is the improvement of transport and operational characteristics of the road and increase the turnaround time by eliminating or reducing the magnitude of the subsidence of the Foundation subgrade.

This task is solved in that to increase the carrying capacity of the soil under the roadbed offers simultaneous device supporting the longitudinal axis of the trench filled with friction material, and laying on top of high strength geosynthetic material.

Arrange axial longitudinal trench performs the role of anchor and recovering the pouring drawdown of the subgrade on a weak ground. Friction material laid in a trench, allows you to increase filtration of ground water and increase soil strength.

The invention is illustrated in the drawing, where figure 1 shows the transverse profile of the thick earthen roads, and figure 2 shows the spatial projection.

Position on the drawings shall mean:

1 - geogrid;

3 - support trench;

2 - fixing half-clamp;

4 - roadbed;

Inn- base width of the subgrade;

InTr- the width of the anchor trench;

InAnd- length ansirovanie;

Hn- the height of the roadbed;

HTrdeep anchor trench;

LTr- the length of the anchor trench

An example of a construction of roadbed.

Base design of roadbed includes:

1. anchor trench;

2. high-strength geosynthetic material.

Length (LTr), depth (HTr) and width (bTrthe trench depends on the magnitude of perceived stress and the type of soils. The recommended width (InTrthe trench should be at least 0.6 m in depth (HTr) not less than 1.2 m Length (LTrthe trench must be greater than the length of the weak section of the road 3 m in each direction.

High-strength geosynthetic material must be with a minimum tensile strength in the longitudinal direction of the tion 15 kN/m and in the transverse direction ≥ 20 kN/m For the maximum clutch geocentricism material and soil are special requirements to the size of the cell, which depends on the soil type and can be from 15×15 to 40×40 mm

An example implementation of the proposed invention is reflected in device technology and the construction of the subgrade with simultaneous device anchor trench and high-strength geosynthetic material:

- removal of the vegetation layer (for new construction) or an existing layer of subgrade (during reconstruction);

- the layout of the ground;

- digging of the trench (3);

- backfilling of the trench with crushed stone, gravel, CBC or bout;

- planning;

- compaction;

- Restylane high strength geosynthetic material (item 1) in 1-2 layer width Inntaking into account the length of ansirovanieAndto create polumbaum (pos.2);

- fill 1-layer subgrade to a height of 20-40 cm;

- planning;

- compaction;

reverse overlap geosynthetic material on the slopes in the body of the mound and create polumbaum (pos.2) with two sides of the roadbed;

- fill 2-layer subgrade to a height of 20-40 cm;

- planning;

- compaction;

sequential repetition of the last three stages on the calculated height.

With the aim of increasing safety and high operational reliability and in some cases it is proposed to arrange not one, but several longitudinal anchor trench (figure 3). The number of longitudinal trenches will depend on the groundwater level (GWL), soil type, height, and width of the subgrade and traffic.

Day of the lowering of the groundwater and reduce the humidity in the heaving areas where terrain conditions permit to discharge water in a special discharge device in the support trenches, it is recommended to place drainage tubes (figure 4). The diameter of the drainage pipe (5) is determined by calculation depending on the water flow in the drainage. Arrange the anchor trench perform additional functions: drainage, vodopadnyaya and drainage.

1. Road construction, including roadbed with roadsides and slopes, located in the sub grade support longitudinal filled with material of the trench, on top of which are placed geosynthetic material, characterized in that the longitudinal trench located along the axis of the subgrade, or several longitudinal trenches made of a width of 0.6-1.0 m at a depth of 1.2-2.7 m and filled with friction material, and geosynthetic materials with a minimum tensile strength in the longitudinal direction 15 kN/m and in the transverse direction ≥20 kN/m laid on top of the trench with a reverse overlap in the body of the mound, providing creating polumbaum two sides of the earthen floor is TNA.

2. The construction according to claim 1, characterized in that the abutment of the longitudinal trenches placed drain pipes.



 

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