Method for repairing / improving asphalt-paved road

Abstract

To reinforce / restore a lower subbase and improve durability of an upper subbase in an asphalt-paved road generated due to traveling load.SOLUTION: This repairing / improving method comprises: a step of forming a hole 200 by drilling from a surface layer 150 to the top surface (the bottom surface of a lower subbase 120) of a road floor 110; a step of removing a waste material 200a from the hole 200; a step of filling the hole 200 up to the position of the top surface of the lower subbase 120 with mortar 122 (which, when dried and cured, becomes a mortar support pillar); a step of drying the mortar 122; a step of cutting and removing an existing upper subbase 130, a base layer 140, and the surface layer 150 after the mortar 122 has been dried to a certain extent; and a step of newly laying an upper subbase 130a, a base layer 140a, and a surface layer 150a.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to asphalt paved roads, and particularly to a technology for repairing and improving asphalt paved roads damaged by vehicle driving.

Background Art

[0002] Asphalt paved roads are widely used, but deterioration over time, particularly damage caused by vehicle driving loads, is inevitable and regular maintenance (repair) is carried out.

[0003] An asphalt paved road generally has a subgrade layer 120 and an upper subgrade (which may be referred to as "asphalt base" or "ABa" in this specification and the drawings) 130 laid as a roadbed on top of the roadbed 110 located at the bottommost layer. Further, a base layer (which may be referred to as "Bi" in this specification and the drawings) 140 and a surface layer 150 composed of asphalt with different roughnesses are laid thereon (see Fig. 4). Note that the reference numeral 300 in Fig. 4 is a part (tire) of a vehicle for indicating the driving load.

[0004] Due to the driving load by vehicles, particularly, distortion occurs on the bottom surface side of the upper subgrade 130, causing cracks, and rainwater infiltrates into this part, accelerating deterioration at the subgrade level.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Of course, the labor and cost are significantly different between repairs that only involve the surface layer 150 and the base layer 140 made of asphalt and repairs that reach the subgrade level. Therefore, there is a desire to extend the interval between repairs that reach the subgrade level and reduce the number of times.

[0007] Therefore, the present invention has been made to solve such problems, and its object is to reduce the distortion of the upper subgrade (bottom surface) in an asphalt-paved road caused by the running load and improve the durability of the upper subgrade.

Means for Solving the Problems

[0008] In order to solve the above problems, the invention of the present application is a method for repairing and improving an asphalt-paved road comprising at least a roadbed, a lower subgrade, an upper subgrade, a base layer, and a surface layer from the lower layer to the upper layer, comprising a step of drilling holes from the surface layer to the top surface of the roadbed (bottom surface of the lower subgrade) to create hole portions, a step of removing waste materials in the hole portions, a step of filling the hole portions with mortar up to the position of the top surface of the lower subgrade, a step of drying the mortar, a step of cutting and removing the existing upper subgrade, base layer, and surface layer after the mortar has dried to a certain extent, and a step of newly laying the upper subgrade, base layer, and surface layer.

[0009] By going through such steps, the supporting force of the lower subgrade is increased, and the distortion of the upper subgrade due to the running load is reduced. In short, a "mortar column (cement pile)" is provided afterwards at the portion of the lower subgrade where the running load is applied. As a result, the durability of the upper subgrade can be improved, and the durability of the entire asphalt-paved road is enhanced.

[0010] In the present invention, before cutting and removing the existing (damaged) upper roadbed, base layer, and surface layer, holes are drilled from the surface layer to the top surface of the roadbed (bottom surface of the lower roadbed) to create holes, and mortar is poured into the holes to provide "mortar columns". Then, the existing (damaged) upper roadbed, base layer, and surface layer are cut and removed. By adopting such a procedure, it is possible to prevent the lower roadbed from collapsing (becoming a mortar bowl shape) due to drilling and fill the mortar into the intended shape.

[0011] Further, the holes are provided at two positions each corresponding to the left and right wheels of the vehicle and having different positions in the width direction of the lane for each lane, for a total of four positions.

[0012] With such a configuration, it is possible to efficiently reinforce the portions that are likely to receive the running load, and reduce the cost of repair and improvement.

[0013] Further, the holes are provided at regular intervals in the longitudinal direction of the lane, and the regular interval in the longitudinal direction is set wider than the interval in the width direction of the two holes.

[0014] With such a configuration, it is possible to effectively receive the running load from the wheels of large trucks that are most likely to receive the running load, and by widening the interval in the longitudinal direction, the implementation time (i.e., the lane regulation time) is shortened and the implementation cost is reduced.

Effects of the Invention

[0015] By applying the present invention, it is possible to reinforce and recover the lower roadbed in the asphalt pavement road caused by the running load, and improve the durability of the upper roadbed.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0017] Hereinafter, with reference to the accompanying drawings, a repair and improvement method for an asphalt pavement road, which is an example of an embodiment of the present invention, will be described. Note that, for easy understanding of the drawings, there are parts where the sizes and dimensions of each part are exaggerated and do not necessarily match the actual object. Also, each drawing is to be viewed in the direction of the reference numerals, and the up, down, left, right, front, and rear are expressed based on this direction.

[0018] 〈Configuration of the Asphalt Pavement Road after Repair and Improvement〉 Referring to FIG. 1, the asphalt pavement road 100 after being repaired and improved by the repair and improvement method for an asphalt pavement road according to the present invention has a configuration in which a plurality of mortar supports (cement piles) 122 are provided in the portion of the lower roadbed 120.

[0019] For each lane, the mortar supports 122 are provided at two positions (OWP, IWP) each, for a total of four positions, at positions corresponding to the left and right wheels of the vehicle and with different positions in the width direction of the lane (FIG. 1(b)).

[0020] Further, the mortar columns 122 are provided at regular intervals (0.5 m intervals in FIG. 1) in the longitudinal direction of the lane, and the regular interval (0.5 m) in the longitudinal direction is wider than the widthwise interval (0.3 m intervals in FIG. 1) between the two holes provided at positions corresponding to the left and right wheels of the vehicle and at different positions in the width direction of the lane.

[0021] 〈Procedure for Repair and Improvement of Asphalt Paved Road〉 Subsequently, with reference to FIGS. 2 to 3, the procedure of the method for repairing and improving an asphalt paved road, which is an example of an embodiment of the present invention, will be described.

[0022] Starting from the state before repair and improvement (FIG. 2(a)), first, a hole 200 is made by drilling from the surface layer 150 to the top surface of the roadbed 110 (or the bottom surface of the lower roadbed 120) (FIG. 2(b)). The drilling operation uses a drilling machine such as a rotary percussion drill.

[0023] In FIG. 2, a total of four holes 200 are provided at two positions each in the width direction of the lane at positions where a running load is applied (for example, positions where rutting is progressing) with different positions.

[0024] By the drilling operation, the hole 200 is formed, and waste material (drilling debris) 200a is generated in the hole 200. Therefore, the waste material 200a is removed by suction or the like (FIG. 2(c)).

[0025] Subsequently, the hole 200 that has been hollowed out is filled with mortar (non-shrinking mortar is desirable) 122. The filling is up to the position of the top surface of the lower roadbed 122 (FIG. 3(a)). In that state, it is cured and waited for until the filled mortar dries and hardens to a certain extent (about 24 hours).

[0026] When the mortar 122 dries and hardens, it becomes a mortar column (cement pile) 122.

[0027] Thereafter, the existing upper roadbed 130, base layer 140, and surface layer 150 are cut and removed (Fig. 3(b)).

[0028] Finally, a new upper roadbed 130a, base layer 140a, and surface layer 150a are sequentially laid on the exposed lower roadbed 120 to complete the process. Note that these newly laid new upper roadbed 130a, base layer 140a, and surface layer 150a may have a structure different from that of the removed existing ones.

[0029] Thus, the invention of the present application is a method for repairing and improving an asphalt pavement road 100 composed of at least a roadbed 110, a lower roadbed 120, an upper roadbed 130, a base layer 140, and a surface layer 150 from the lower layer to the upper layer, and includes a step of drilling a hole from the surface layer 150 to the top surface of the roadbed 110 (the bottom surface of the lower roadbed 120) to form a hole portion 200, a step of removing waste material 200a in the hole portion 200, a step of filling the hole portion 200 with mortar (which becomes a mortar support column by drying and hardening) 122 up to the position of the top surface of the lower roadbed 120, a step of drying the mortar 122, a step of cutting and removing the existing upper roadbed 130, base layer 140, and surface layer 150 after the mortar 122 is dried to a certain extent, and a step of laying a new upper roadbed 130a, base layer 140a, and surface layer 150a.

[0030] By going through such steps, the supporting force of the lower roadbed 120 is increased, and the distortion of the upper roadbed 130 due to the running load is reduced. In short, a "mortar support column (cement pile) 122" is provided afterwards at the portion of the lower roadbed 120 where the running load is applied. As a result, the durability of the upper roadbed 130 can be improved, and the durability of the entire asphalt pavement road 100 is enhanced.

[0031] In the present invention, before cutting and removing the existing (damaged) upper roadbed 130, base layer 140, and surface layer 150, holes are drilled from the surface layer 150 to the top surface of the roadbed 110 (bottom surface of the lower roadbed 120) to form hole portions 200, and mortar 122 is poured therein to provide "mortar columns 122", and then the existing (damaged) upper roadbed 130, base layer 140, and surface layer 150 are cut and removed. By adopting such a procedure, it is possible to prevent the lower roadbed 120 from collapsing (becoming a mortar bowl shape) due to drilling and fill the mortar 122 into the intended shape.

[0032] Further, the hole portions 200 are characterized in that, for each lane, four holes are provided at positions corresponding to the left and right wheels of the vehicle and at different positions in the width direction of the lane, two holes at each position.

[0033] With such a configuration, it is possible to efficiently reinforce the portions that are liable to receive the running load, and reduce the cost of repair and improvement.

[0034] Further, the hole portions 200 are provided at regular intervals in the longitudinal direction of the lane, and the regular interval in the longitudinal direction is set wider than the interval in the width direction between the two hole portions.

[0035] With such a configuration, it is possible to effectively receive the running load from the wheels of large trucks that are most likely to bear the running load, and by widening the interval in the longitudinal direction, the implementation time (i.e., the lane regulation time) is shortened and the implementation cost is reduced.

Description of Reference Numerals

[0036] 100 ··· Asphalt Paved Road 110 ··· Roadbed 120 ··· Lower Roadbed 122 ··· Mortar Column (Cement Pile) 130 ··· Upper Roadbed 130a ··· New Upper Roadbed 140 ··· Base Layer 140a ··· New Base Layer 150 ··· Surface layer 150a ··· New surface layer 200 ··· Hole part 200a ··· Scrap 300 ··· Vehicle

Claims

1. A method for repairing and improving an asphalt pavement road comprising at least, from the lower layer to the upper layer, a roadbed, a lower subgrade, an upper subgrade, a base layer, and a surface layer, a step of drilling holes from the surface layer to the top surface of the roadbed (bottom surface of the lower subgrade) to create hole portions; a step of removing waste materials in the hole portions; a step of filling the hole portions with mortar up to the position of the top surface of the lower subgrade; a step of drying the mortar; a step of cutting and removing the existing upper subgrade, base layer, and surface layer after the mortar has dried to a certain extent; a step of newly laying an upper subgrade, a base layer, and a surface layer; and A method for repairing and improving an asphalt pavement road.

2. In Claim 1, the hole portions are provided in two locations each, for a total of four locations, at positions corresponding to the left and right wheels of the vehicle and at different positions in the width direction of the lane for each lane. A method for repairing and improving an asphalt pavement road, characterized in that.

3. In Claim 2, the hole portions are provided at regular intervals in the longitudinal direction of the lane, and the regular interval in the longitudinal direction is set wider than the interval in the width direction of the two hole portions. A method for repairing and improving an asphalt pavement road, characterized in that.

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