RU2454502C1 - Method to repair road bed - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: surface layer is removed, the section is filled with a polymer concrete with binding fillers, further a flat U-shaped thermoplastic reinforcing element from plastic is inserted into the road bed body with a collar down, reinforced with a metal L-shaped bar and taken to the level of the surface layer. Such combination of used materials makes it possible to strengthen a damaged section of the road without application of bitumen-containing binding components as a binder, using at the same time standard and simple equipment and rigging.

EFFECT: strengthening and repair of a road bed, reduced labour intensiveness due to application of simple equipment and rigging, increased service life.

2 cl, 2 dwg

Description

The proposed method relates to the field of road construction and can be used in the repair and strengthening of asphalt concrete pavement.

The well-known "Method of repairing asphalt concrete pavement" [1], according to which the upper layer of asphalt concrete pavement is destroyed by cutting grooves in this layer, between which undamaged strips remain, remove it from the pavement, crush it, introduce regenerative additives while stirring, stack, level and compact.

The disadvantage of this method is that they repair only the top layer of the roadway. However, the middle part, subject to high loads and deformations during operation, is not strengthened during the repair process, which leads to the occurrence of internal subsidence and softening and to a significant deterioration in the quality of the roadway.

Of the known closest in technical essence is the “Method of strengthening and repairing the roadway” [2], according to which wells are drilled in the body of the roadway, then cementing components and reinforcing cone-shaped elements with a loose fit with a truncated end down are introduced, and the cementing components of the well are filled up to the level of the subsurface layer, after which they fall asleep with a layer of incompressible material and tamp.

The disadvantage of this method is that to eliminate even a slight dimple or drawdown, it is necessary to drill the road to a considerable depth, which leads to large financial losses for the use of special equipment. Also a disadvantage is the use of astringent bitumen-containing components that crystallize at low temperatures, which leads to an increase in the fragility of the binder component and, thus, leads to the destruction of the reconstructed section of the roadway.

The technical result of the proposed method is to simplify the repair of the roadway, the possibility of using the carriageway almost immediately after its repair, reducing the complexity and improving the quality due to the rejection of the use of bitumen-containing components.

This is achieved by the fact that in the method of repairing the roadway, according to the invention, the surface and subsurface layers of the pavement are removed, then quickly hardened polymer concrete is poured onto the repair area to the height of the rim of the thermoplastic reinforcing element into which a flat U-shaped reinforcing thermoplastic element with rims is inserted , for example, in the form of a disk. Then, through the central through hole, the reinforcing element is reinforced with a L-shaped metal bar. To improve the adhesion properties of the reinforcing bar and the underlying layers of pavement, it is advisable to perform its corrugated surface. Next, quick-hardening polymer concrete through diagonal through holes in the body of the thermoplastic reinforcing element is poured to the level of the roadway. The gaps between the thermoplastic reinforcing element and the roadway are also poured with quick-hardening polymer concrete to the level of the roadway.

In addition, the reinforcing bar may have a corrugated surface (claim 2 of the claims).

The figure 1 shows a section of a thermoplastic reinforcing element with a designation of dimensions.

The figure 2 shows a section of the roadway with a reinforcing element and a reinforcing bar, where 1 is the ground; 2 - reinforcing metal bar; 3 - plastic reinforcing element.

The reinforcing element is, for example, a disk with a maximum diagonal dimension P and height H with transverse through holes of radius r and a central hole of radius r *, through which reinforcement is made by a L-shaped metal bar. The disk has a circular rim of height L and width B. On the upper surface of the reinforcing element, a groove is made for the reinforcing bar of length J and depth I.

The reinforcing thermoplastic element is easy to manufacture (injection molding), it is able to maintain its strength and insulating characteristics at a wide range of temperatures and under cyclic unidirectional forces.

The method of installing a reinforcing element in the road body is as follows - first, in the places of local subsidence or deconsolidation of the roadway, the surface and subsurface layers of the road surface are removed with a diameter of D = P + Δ and depth H + Δ, where Δ = 2 ÷ 5 cm, then the resulting hole is blown compressed air and fill with quick-hardening polymer concrete with cementitious fillers at a distance L from the lower boundary of the hole. After that, a fastening thermoplastic element is introduced into the quick-hardening polymer concrete, reinforced through the central through hole with a L-shaped metal bar and deepened into the road body so that the upper surface of the thermoplastic reinforcing element is at the level of the road surface. After that, through diagonal through transverse openings in the body of the thermoplastic reinforcing element and through the gaps between the thermoplastic reinforcing element and the roadway, quick-hardening polymer concrete is poured to the level of the road surface, and excess polymer concrete that has come to the surface through the through transverse holes and along the boundaries of the reinforcing element is higher than the level the surface layer of the roadway is removed by improvised means. The reconstructed section of the road 5 minutes after the initial filling with polymer concrete is ready for the resumption of traffic. The adhesion of the element to the underlying soil, therefore, occurs due to reinforcement with a steel bar, and due to the bonding properties of polymer concrete. This is due to the fact that after removing the surface layer of asphalt concrete does not surface treatment (with the exception of air blowing). This achieves a greater resource of this section of the carriageway, simplification of the technology for the performance of work (almost no completion work is required).

One of the main advantages of the proposed method is the rejection of the use of bitumen-containing binder components. The materials used in the proposed method withstand lower temperatures, and are also less susceptible to the influence of abrupt climatic changes (transition from positive to negative temperatures, saturation with sewage, etc.).

Example. At the site of subsidence of the roadway, the surface layer is removed to a depth of 10 cm and a diameter of 80 cm. Next, the site is poured with polymer concrete with cementitious fillers to the level of the surface layer and a thermoplastic reinforcing element with a maximum diagonal distance of 38 cm, height 8 cm, with a central through hole with a radius of 1.5 cm, and diagonal transverse through holes with a radius of 10 cm, side down to the level of the road surface. The dimensions of the side - height 3.2 cm, width 2 cm. The reinforcing element is reinforced with a metal bar of a L-shaped radius of 0.5 cm to a depth of not less than 15 cm. The upper part is placed in a special groove on the outer surface. The dimensions of the groove on the upper surface of the thermoplastic reinforcing element: length - 6 cm, depth - 2.5 cm. Excess polymer concrete is removed by improvised means (scraper or shovel). After a short time in the reconstructed area, the resumption of traffic is possible.

The materials used in the proposed method withstand lower temperatures, are less susceptible to the influence of abrupt climatic changes (transition from positive to negative temperatures, saturation with wastewater).

The advantages of the proposed method for repairing the roadway are repair and strengthening of the road surface, the ability to restore traffic on the repaired area immediately after pouring with polymer concrete, the use of simple structures made of inexpensive materials as fastening elements, the quick repair of problem areas, and the refusal to use bitumen-containing binder components.

The proposed method provides a higher technical and economic effect and can be carried out using known devices and means.

Information sources

1. Patent SU 129401 A1 “Method for repairing asphalt concrete pavement”.

2. Patent RU 2381325 "Method for strengthening and repairing the roadway."

Claims (2)

1. The method of repairing the roadway, including the removal of the surface and subsurface layers of pavement, placing a reinforcing element in the road body, characterized in that the surface and subsurface layers of the road surface are removed with a diameter of D = P + Δ and depth H + Δ, where Δ = 2 -5 cm, where P is the maximum diagonal size of the reinforcing element, H is the height of the reinforcing element, then the resulting hole is blown with compressed air and filled with quick-hardening polymer concrete with cementitious fillers at a distance L from the lower face holes, where L is the height of the side of the reinforcing element, after which a fastening thermoplastic plastic element is introduced in the form of a disk with through lateral openings with the sides down, reinforce it through a central through hole with an L-shaped metal bar of length H and deepen into the road body with so that the upper surface of the thermoplastic reinforcing element is at the level of the surface of the roadway, then through the diagonal through transverse holes in t le termoplastmassovogo reinforcing member and through gaps between the strengthening member and termoplastmassovym roadway produce fill bystrozatverdevayuschim polymer concrete to the level of the road surface, and the excess polymer is removed improvised means. 2. The method according to claim 1, characterized in that it is reinforced with a metal bar having a grooved surface.

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