RU2360062C1 - Cell structure of road bed - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: in a highway, road bed design whereof provides for waysides, slopes, based in the road bed by longitudinal ditches filled up with bulk material, there are additionally introduced cross ditches, whereat longitudinal ditches are made along the road periphery and along the treadway lines, depth whereof is more than depth of freezing, and cross ditches with an increment increasing proportional to the transport load; ditches are filled up with discrete reinforcing material, for example, branches of trees, straw, etc and poured over by 90%…95% of the depth with binding composition, for example, clay-sand, with continuous fastened against each other in ditches cross hairs reinforcing elements placed thereon, for example polypropylene strips poured over with binding composition, provided that longitudinal reinforcing elements are strained ensuring compression stress in the surface layer.

EFFECT: reinforcement of the weak base, enhanced strength and bearing capacity of the road.

1 cl, 5 dwg, 3 ex

Description

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

There are known road constructions in which, in order to increase the bearing capacity, various reinforcing elements are laid in the road body - trees and logging residues, nets, mats made of polymeric materials, etc. [1, 2, 3].

The disadvantage of these solutions is the low resistance of the road body to seasonal temperature and humidity cycles, especially transitions from positive to negative temperatures, freezing-thawing of multilayer, multiphase heterogeneous structures of the road body.

There are known roads in which pavements are reinforced with rings, metal strips, metal pins and piles [1, 4, 5, 6].

The disadvantage of these solutions is the low effectiveness of strengthening pavement, since deformations of the underlying layers and the body of the road under the influence of temperature, humidity and power factors often exceed permissible.

The closest solution taken as a prototype is the construction of the subgrade, including the subgrade with roadsides and slopes, supporting longitudinal longitudinal material-filled trenches in the subgrade, in particular friction material-crushed stone [7].

The prototype has a drawback - low road resistance to heavy traffic loads, which leads to road defects such as “privacy”, “potholes”, “drawdowns”, “gaps”.

The technical result of the invention is to increase the stability of the base of the road.

The invention consists in the following: in a road containing a roadbed construction with curbs, slopes, longitudinal trenches in the roadbed filled with bulk material, transverse trenches are additionally made, while longitudinal trenches are made along the edges of the road and along gauge lines with a depth greater than freezing depths, and transverse trenches - with a step frequency increasing in proportion to the transport load, the trenches are filled with discrete reinforcing material, for example branches and trees, straw, etc., are filled to 90 ... 95% of the depth with a binder composition, such as clay sand, on top of which continuous reinforcing elements, for example polypropylene tapes, are laid together at the crosshairs of trenches, and trenches are baked to the top with the binder composition, and longitudinal reinforcing elements are tensioned. This provides compression stress in the surface layer.

Figure 1 shows a diagram of a section of the structure along aa.

Figure 2 presents the design diagram - a cross section of the road, where 1 is the embankment, 2 is the longitudinal trench, 3 is the top road surface.

Figure 3 shows a sectional diagram of the structure along AA, here 1 is an embankment, 2 is a longitudinal trench, 4 is a transverse trench.

Figure 4 shows a section along BB, where 4 is the transverse trench 2 ... 3 times less deep than the longitudinal, 3 is the top road surface.

Figure 5 - scheme of cross trenches, where 2 is a longitudinal trench, 4 is a transverse trench, 5 is a reinforcing tape elements, 6 is a fastening node.

Examples of execution.

Example 1. In a subgrade with a width of 6 m of a newly built road, trenches of 8 ... 10 cm wide along the edges and under-track lines to a depth of 1.4 m and transverse to a depth of 0.7 m are cut along one lane on both sides, using a Belarus tractor with with a standard hinged saw, trenches are filled with discrete reinforcing material, tree branches, logging residues, filled with clay-sand composition not to the top, but 90 ... 95% of the trench depth, continuous reinforcing elements are laid on top of the composition - polypropylene tape, fastened between oh crosshairs in trenches, the longitudinal reinforcing elements and the loops pull dozalivayut trench glinopeschanoy composition then arrange road surface coating, thereby obtaining a stable cellular structure subgrade.

Example 2. When repairing a stretch of road with asphalt concrete pavement with defects such as “clogging”, “subsidence”, trenches are cut, forming a honeycomb mesh structure with cells of 1000 mm × 1000 mm, the trenches are filled with thin concrete with internal reinforcing polypropylene tapes, and then on the surface of the honeycomb structures place a welded mesh of polypropylene tapes and roll them up with asphalt concrete.

Example 3. When designing and manufacturing roads or runways from slabs, a honeycomb mesh structure is cut along the dimensions of the slabs. Reinforcement and pouring with a binder composition is carried out in accordance with the loads acting on the road or runway, for example, for runways for heavy aircraft such as A-380, reinforcement is carried out with polyester tapes, and concrete is used as a binder composition.

Information sources

1. Babkov V.F. et al. Road design. - M .: Transport, 1987.

2. Handbook of a road engineer. Repair and maintenance of roads. Ed. A.P. Vasilieva. - M .: Transport, 1989.

3. Development of new designs of pavements reinforced with fiber and nets. 10.30.2002, GUP “NII Mosstroy”, article on the Internet: www.srtoinanka.ru.

4. SU 1011757 A, 04/15/1983; DE 2438822 A1, 02.26.1976; GB 1105961 A, 03/13/1968.

5. Karpov V.K. "Highways" RU 61297 V1, 02.27.2007.

6. Borovik V.S. "Design of pavement" RU 2310031 C1, 10.11.2007.

7. Shekhov S.V. and other "Road construction" RU 2289648С.

8. Yarmokinsky A.I. and other "Construction of the subgrade" RU 2288986 C2, 11/20/2005.

9. Smogunov V.V. and other innovative ways of road construction. Report and research. No. 5-TMT, 2008, 286 p.

Claims (1)

Cellular construction of the subgrade, containing the construction of the subgrade with curbs, slopes, longitudinal trenches located in the subgrade, filled with bulk material, characterized in that the transverse trenches are additionally made, while the longitudinal trenches are made along the edges of the road and along the gauge lines deeper than the depth freezing, and transverse trenches with a step frequency increasing in proportion to the transport load, the trenches are filled with discrete reinforcing material, for example, tree branches yews, straw, etc., are filled to 90 ... 95% of the depth of the trench with a binder composition, for example, clay sand, on top of which continuous reinforcing elements are fastened together at the crosshairs of the trenches, for example polypropylene tapes, trenches are sized up to the top with the binder composition, and longitudinal reinforcing the elements are taut.

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