RU2526960C1 - Method to repair asphaltic concrete pavement after sampling with core barrel (versions) - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method to repair an asphaltic concrete pavement after sampling with a core barrel includes filling of a hole with crushed stone and insertion of a plug into the hole. Besides, a bitumen net is laid onto the bottom of the hole and on top of crushed stone, the plug is inserted, made in the form of a cylinder with a diameter that is 4-8 mm less than the diameter of the core barrel crown, the slot between the plug and the hole is filled with sand, on top the joint is poured with hot bitumen, or edges of the road pavement and the plug are heated with a burner, and a bitumen tab is applied.

EFFECT: increased quality of closing of holes and durability of a repaired section, reduced labour intensiveness and time of repair works.

3 cl, 3 dwg

Description

The invention relates to the field of construction of roads and pavements, namely, to restore the surface of the pavement after sampling with a core sampler.

When the road is commissioned in accordance with regulatory documents, quality control of the paved surface is carried out. For this, the required number of samples is taken with a core sampler, that is, the cylinders are drilled to the required coating thickness. With a coating width of up to 7 m, three samples are drilled per 1 km at a distance of at least 0.5 m from the axis of the road or from the edge of the coating; with a width of more than 7 m - three samples from every 7000 m ^{2 of} coating. To close the holes that are formed, hot asphalt concrete mix is usually delivered from the factory in small quantities and is quickly laid and compacted, or cold asphalt concrete is heated at the work site and also quickly laid and compacted. This is laborious, expensive, and leads to a deterioration in the quality of the paved road surface.

Known for sealing such holes with conical plugs or plugs made of rubber or plastic (http://bitutec.com/en/neuheiten/Bit_Fachaufsatz_2002.pdf). Closing holes in this way is done by driving in plugs or plugs with the blows of a rubber hammer (pressure seal or power short circuit). However, rubber or plastic parts are foreign bodies in the asphalt layer and do not bind to the asphalt surface. If such a plug is set too deep, water may accumulate in the recess, which during freezing leads to the destruction of the asphalt coating near the hole. If the plug does not exactly hit the hole or is set too high, there is a danger of it being knocked out or pulled out when the vehicle is moving. In this case, immediately begins the process of destruction of the upper layer of asphalt pavement.

Closest to the claimed method is a road repair method using a bitumen-based plug for hermetically sealing holes in asphalt and concrete surfaces according to the invention patents US No. 3699854 "PAVEMENT REPAIR", CA No. 964914, DE No. 10012292. The plug is made of bitumen-containing materials, the main components of which are asphalt - from 65 to 98%, and rubber - from 2 to 4%. The composition of the components may include limestone and / or Portland cement. The hole drilled during core sampling is filled with high-grade crushed stone and compacted, heated with a propane burner, a plug is manually inserted into it and the center of the hole is hammered with a rubber hammer. The plug and the road surface around it are heated with a burner to form a monolithic coating. The disadvantages of the plug and the method of its installation are: hammering the plug with a hammer, which increases the repair time; the use at the final stage of the burner, which burns bitumen film, which degrades the quality of repair and can lead to further destruction of the roadway at the junction; the presence of a small protrusion of its upper part above the road surface, which should subsequently be compacted under the influence of the transport load.

The inventive method, as well as known, includes filling the holes with gravel and inserting a plug into the hole.

The problem solved by the invention was to prevent the destruction of broken sections of the asphalt pavement when exposed to vehicles, rain and frost and to simplify the sealing of holes in the finished asphalt pavement after sampling with a core sampler.

The technical result consists in improving the quality of the sealing holes and the durability of the repaired area, in reducing the complexity and time of repair work.

The technical result is achieved by the fact that at the bottom of the hole and on top of the gravel, a bituminous mesh is laid or applied, a plug is inserted, made in the form of a cylinder 4-8 mm in diameter smaller than the diameter of the core sampler crown. The groove between the plug and the hole is filled with sand. Top fill the seam with hot bitumen or heat the edges of the roadway and the plug with a burner and apply a bitumen sticker.

The bitumen sticker can be made in the form of a circle, the outer diameter of which is 30-60 mm larger than the diameter of the core sampler crown, the inner diameter is 30-60 mm smaller than the diameter of the plug. A comb can be made at the bottom of the sticker to fit it into a groove formed by the difference in the diameters of the hole to be sealed and the plug.

Drawing on the bottom of the hole and on the surface of the crushed stone bitumen mesh, made in place or specially made, provides better adhesion and, thereby, improving the quality of the sealing holes and the durability of the repaired area.

The use of a plug made in the form of a cylinder with a diameter of 4-8 mm less than the diameter of the core of the core sampler reduces the complexity and time of repair work.

The use of bitumen stickers improves the quality of the seal and the durability of the repaired area.

The combination of the above distinguishing features, combined, provides the claimed technical results.

The method (options) is explained using the drawings, in which Fig. 1 shows a diagram of a repair of holes in a pavement in a section, in Fig. 2 is a side view of a plug, in Fig. 3 is a side view of a bitumen sticker in a section.

According to one embodiment of the method, the bottom 1 (see FIGS. 1-2) opens the holes 2 of the asphalt concrete coating, lay the bituminous mesh 3, fill the hole 2 with crushed stone 4, lay the bituminous mesh 5 over the crushed stone 4. Then insert a plug 6 made of a cylindrical shape with a diameter d of 4-8 mm less than the diameter of the core sampler crown, burn the edges of the roadway and the upper part of the plug 6 with a burner and apply a bitumen sticker 7. When using a plug 6, it is 6-8 mm less than the diameter of the core sampler in the gap between the plug 6 2 sprinkled sand hole 8. The diameter range is optimal stub 6: when the plug diameter 8-14 mm less than the diameter of the core barrel bitumen sticker "sags", which leads to lower quality seal openings.

According to the second embodiment of the method, a mesh of hot bitumen 3 is applied to the bottom 1 of the hole 2, the hole 2 is filled with crushed stone 4, a mesh 5 of hot bitumen is also applied over the crushed stone 4, a plug 6 is made, which is made in the form of a cylinder 4-8 mm smaller in diameter sampler crowns, fill the seam with hot bitumen (not shown) from above or burn the edges of the roadway and the plug with a burner and apply a bitumen sticker 7. When using a plug 6 with a diameter d of 6-8 mm less than the diameter of the core sampler in the gap between plug 6 and the hole sand 2 is also poured with grade 2.

A method of manufacturing a bitumen grid 3 and 5: on plexiglass (polymethylmethacrylate), lubricated with a special composition (not shown), apply hot bitumen in the form of a grid, cool, remove and store in a cool place.

Cylindrical plugs 6 of the required diameter d are formed in laboratory conditions, taken out to the place of installation in a cold form and can be laid immediately after sampling with preliminary cleaning of the open area from water and dirt. The asphalt mix for molding is used the same as in the laid coating, but with a maximum grain diameter of 10 mm. It is possible to produce plugs 6 (cylinders) of various heights, for example, 30-60 mm. If only the top layer of the road surface is selected for core quality control using a core sampler, then the height of hole 2 is 40-60 mm and one cylinder 6 is sufficient to seal hole 2. If two layers are the lower and upper, then the height of hole 2 can be 80-90 mm To seal such a hole, you can make one cylinder 70-80 mm high or use two cylinders 40 mm high and connect (glue) them together with bitumen.

Bitumen sticker 7 (see figure 3) is also made in laboratory conditions in a special form and stored in a fairly cool place. The outer diameter of the sticker 7 is 30-60 mm larger than the diameter of the core sampler crown, the inner diameter of the hole 10 is 30-60 mm smaller than the diameter of the plug 6. Sticker 7 can be made in the form of a circle with a ridge 9 (protrusion) for laying it in the groove formed by the difference diameters of the closing hole 2 and the plug 6.

The invention is as follows.

Drill a sample from the pavement. They clear the freed area from water and dirt (it is possible by blowing a stream of warm air). A special ruler with a bent perpendicular edge (not shown) measures the thickness of the bottom filling with gravel fraction of 5-15 mm. For better adhesion, the bottom 1 is heated with a gas burner and the bitumen mesh 3 is laid or the mesh 3 is applied to the bottom 1 with hot bitumen without heating it. The required thickness of crushed stone 4 is poured so that the inserted cylinder 6 protrudes 2-3 mm above the surface. In the manufacture of the plug 6 with a diameter of 6-8 mm less than the diameter of the core sampler, sand 8 is poured into the gap between the plug 6 and hole 2. The crushed stone 4 is either poured with hot bitumen on top or bitumen mesh 5 is laid on it with preliminary heating of the crushed stone surface 4 with a burner. Insert the asphalt concrete cylindrical plug 6. Seams are shed on top with hot bitumen, or after the burner warms up the edges of the canvas and the inserted cylinder, a bitumen sticker 7 is applied.

Since there is a laboratory at every asphalt concrete plant, it is more convenient to produce plugs, bitumen nets and bitumen stickers on its territory. At the same time, a manual method for the preparation of asphalt concrete mix of a certain proportion is not required, it is selected in parallel with the bulk, necessary for periodic testing of the quality of products.

The claimed method provides an increase in the quality of the sealing of holes and durability of the repaired area, reducing the complexity and time of repair work.

Claims (3)

1. A method of repairing an asphalt concrete coating after sampling with a core sampler, including filling the hole with crushed stone and inserting a plug into the hole, characterized in that a bitumen mesh is laid or applied to the bottom of the hole and over the crushed stone, and a plug is made in the form of a cylinder with a diameter of 4-8 mm smaller than the diameter of the crown of the sampler, the groove between the plug and the hole is filled with sand, the seam is filled with hot bitumen on top or the edges of the roadway and the plug are heated with a torch and a bitumen sticker is applied. 2. The method according to claim 1, characterized in that the bitumen sticker is made in the form of a circle, the outer diameter of which is 30-60 mm more than the diameter of the crown of the sampler, the inner diameter is 30-60 mm less than the diameter of the plug. 3. The method according to claim 2, characterized in that at the bottom of the sticker a comb is made for laying it in a groove formed by the difference in the diameters of the hole to be sealed and the plug.

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