KR20240013009A - Road reparing method cold recycling waste ascon in construction site to reduce carbon emission - Google Patents

Abstract

The present disclosure provides a pavement repair method for recycling waste asphalt concrete at room temperature at a construction site to reduce carbon emissions, comprising: a cement spraying step of spraying cement on a construction road along a predetermined direction in which road repair is performed; A crushing step of crushing at least a portion of the road surface of the construction road to obtain waste asphalt concrete; An asphalt supply step of supplying asphalt to the waste asphalt obtained in the crushing step; A water supply step of supplying water to the waste asphalt concrete obtained in the crushing step; A recycling step of mixing the waste asphalt concrete, water and asphalt to obtain recycled asphalt concrete; and a laying step of laying the recycled asphalt concrete on a crushed road surface, wherein the crushing step and the recycling step are performed in a recycling vehicle driving on the construction road.

Description

Pavement repair method that recycles waste asphalt concrete at room temperature at construction sites to reduce carbon emissions {ROAD REPARING METHOD COLD RECYCLING WASTE ASCON IN CONSTRUCTION SITE TO REDUCE CARBON EMISSION}

Embodiments of the present disclosure relate to a pavement repair method that can reduce carbon emissions by acquiring waste asphalt concrete at a pavement repair construction site and recycling it at room temperature.

Asphalt-concrete mixture (hereinafter referred to as 'ascon') pavement accounts for the largest proportion of paved roads in Korea, and these asphalt pavements must be repaired due to safety issues when they have reached their designed life or are damaged due to other factors. . However, road maintenance costs are increasing every year due to increased paving rates and extreme weather events.

There are several methods for repairing asphalt pavement, such as cutting and overlaying, patching and slurry sealing, but methods other than cutting and overlaying are only small-scale or preventive repair methods. Asphalt concrete is used after cutting the surface of the road to a predetermined depth. The cutting and overlay method of repair using heated asphalt transported from the plant is the most commonly used method.

As maintenance such as cutting and overlaying and sofa repair continues to increase, the amount of waste asphalt concrete increases, and recycled asphalt concrete using waste concrete as recycled aggregate is continuously produced, constructed, and researched.

However, the conventional recycled asphalt plant production system is disadvantageous in terms of environmental efficiency, economic efficiency, speed, etc., because waste asphalt concrete generated by cutting existing roads on site is transported to the plant, reprocessed into recycled aggregate, and then transported back to the site and laid. However, there are drawbacks such as regional limitations.

In addition, in the case of the conventional recycled asphalt plant production system, not only waste asphalt concrete but also new aggregate obtained from stone mountains had to be mixed and used, which had the disadvantage of damaging the natural environment and incurring the cost of collecting new aggregate. In addition, even if recycled asphalt concrete is obtained through heat recycling, there is a problem that the quality such as tensile strength is relatively lowered compared to asphalt road pavement using only new aggregate when paving roads.

In particular, exhaust gas emissions during the transportation of waste asphalt concrete, carbon emissions generated during the combustion process of fossil fuels to produce recycled asphalt by heating at 160° to 180°, and exhaust gases generated during the transportation of recycled asphalt concrete to the site. There is a problem that a large amount of carbon emissions are generated due to emissions, etc.

Korean Patent Publication No. 10-0812354 (2008.03.04)

Embodiments of the present disclosure are intended to provide a pavement repair method that improves the problems of the conventional road pavement construction method described above. Since waste asphalt concrete can be collected and recycled at room temperature on site immediately, carbon emissions can be greatly reduced. The purpose is to provide a possible pavement repair method.

The technical problems to be achieved in the embodiments of the present disclosure are not limited to the matters mentioned above, and other technical problems not mentioned can be explained to those skilled in the art from the various embodiments described below. can be considered.

According to an embodiment of the present disclosure, a pavement repair method for recycling waste asphalt concrete at a construction site to reduce carbon emissions includes a cement spraying step of spraying cement on a construction road along a predetermined direction in which road repair is performed; A crushing step of crushing at least a portion of the road surface of the construction road to obtain waste asphalt concrete; An asphalt supply step of supplying asphalt to the waste asphalt obtained in the crushing step; A water supply step of supplying water to the waste asphalt concrete obtained in the crushing step; A recycling step of mixing the waste asphalt concrete, water and asphalt to obtain recycled asphalt concrete; And it includes a laying step of laying the recycled asphalt concrete on the crushed road surface, wherein the crushing step and the recycling step are performed in a recycling vehicle driving on the construction road. It is possible to provide a pavement repair method.

The asphalt in the asphalt supply step is supplied by an asphalt supply vehicle equipped with an asphalt tank, and the water in the water supply step is supplied by a water supply vehicle provided with a water tank, and the asphalt supply vehicle in the predetermined direction. And the water supply vehicle may be located in front of the recycling vehicle.

In the cement spraying step, cement is spread by a cement supply vehicle equipped with a cement tank, and the cement supply vehicle, the asphalt supply vehicle, the water supply vehicle, and the recycling vehicle continue along the construction road in the predetermined direction. You can drive sequentially.

The asphalt supplied in the asphalt supply step is supplied in the form of foamed asphalt, and the foamed asphalt may be formed by mixing and expanding asphalt, water, and compressed air.

The foamed asphalt is formed in an expansion mixer, and the expansion mixer includes an asphalt providing unit that receives asphalt from the asphalt tank; An expansion chamber whose one side is connected to an end of the asphalt providing part and is formed as a hollow area; a water supply unit supplying water above a predetermined pressure into the expansion chamber; a compressed air supply unit that supplies compressed air of a predetermined pressure or higher into the expansion chamber; and an asphalt discharge part connected to the other side of the expansion chamber and discharging foamed asphalt formed in the expansion chamber, wherein at least a portion of the asphalt providing part is formed in a hollow cylindrical shape so that an asphalt flow path is formed therein. , the asphalt providing unit is provided with a heating unit for heating at least a portion of the inner and outer surfaces of the asphalt providing unit, and the water providing unit is installed in the expansion chamber to supply water at a predetermined pressure or higher into the expansion chamber. water supply nozzle; and a water transfer line coupled to the rear end of the water supply nozzle and transporting water to the water supply nozzle, wherein at least a portion of the water transfer line is wound in a spiral shape along the outer peripheral surface of the cylindrical asphalt providing part. The water supplied by the water providing unit may flow and be heated along the outer peripheral surface of the cylindrical asphalt providing unit.

The recycling vehicle includes a crushing module that crushes at least a portion of the road surface of the construction road; The expansion mixer disposed on top of the crushing module to supply the foamed asphalt to the waste asphalt obtained by the crushing module; A water supply unit disposed at the top of the crushing module to supply water to the waste asphalt concrete obtained by the crushing module; A module casing provided to surround the crushing module and forming a mixing space in which the crushing module is placed; And an asphalt transport unit connected to one side of the module casing and provided with a transport space for transporting the recycled asphalt concrete, wherein the crushing module is a cylindrical crushing roller with a rotation center axis disposed parallel to the ground, and the rotation A crushing roller whose central axis is perpendicular to the predetermined direction; And a plurality of cutting blades provided on the outer peripheral surface of the crushing roller and rotating to crush at least a portion of the road surface of the construction road, wherein the waste asphalt concrete, the foamed asphalt, and the water are mixed in the mixing space to form the recycled asphalt concrete. can be formed.

The pavement repair method includes a primary compaction step of flattening the reclaimed asphalt concrete laid in the laying step; And further comprising a secondary compaction step of additionally flattening the reclaimed asphalt concrete flattened in the primary compaction step, wherein the primary compaction step and the laying step are performed in a construction vehicle running on the construction road behind the recycling vehicle. The secondary compaction step may be performed by a flat roller vehicle running on the construction road behind the installation vehicle.

The pavement repair method further includes an on-site mixing ratio determination step of determining the mixing ratio of the waste asphalt obtained in the crushing step, the foamed asphalt supplied in the asphalt supply step, and the water supplied in the water supply step, and the on-site mixing ratio The decision step includes a sampling step of cutting a portion of the road surface of the construction road and collecting a plurality of test samples; A sample recycling step of supplying foamed asphalt and water at different mixing ratios to each of the plurality of test samples to obtain a plurality of recycled asphalt samples; A test step of performing a plurality of physical property tests on each of the plurality of recycled asphalt samples obtained in the sample recycling step; And it may include a mixing ratio determination step of determining the mixing ratio of the waste asphalt concrete, foamed asphalt, and water based on the results of a plurality of physical property tests performed on the plurality of recycled asphalt samples in the test step.

According to another embodiment of the present disclosure, a pavement repair method includes a cement spraying step of spraying cement on a construction road on which road repair is performed; A crushing step of crushing at least a portion of the road surface of the construction road to obtain waste asphalt concrete; An asphalt supply step of supplying asphalt to the waste asphalt obtained in the crushing step; A water supply step of supplying water to the waste asphalt concrete obtained in the crushing step; A recycling step of mixing the waste asphalt concrete, water and asphalt to obtain recycled asphalt concrete; And a laying step of laying the recycled asphalt concrete on the crushed road surface, wherein the crushing step and the recycling step are performed in a recycling vehicle traveling on the construction road, and the cement spraying step, the crushing step, and the recycling step. can provide a pavement repair method that is continuously performed along a predetermined direction on a construction road.

According to another embodiment of the present disclosure, a pavement repair method includes a cement spraying step of spraying cement on a construction road along a predetermined direction in which road repair is performed; A crushing step of obtaining waste asphalt concrete by crushing at least a portion of the road surface of the construction road to a predetermined depth along a predetermined direction on the construction road; An asphalt supply step of supplying asphalt to the waste asphalt obtained in the crushing step; A water supply step of supplying water to the waste asphalt concrete obtained in the crushing step; A recycling step of mixing the waste asphalt concrete, water and asphalt to obtain recycled asphalt concrete; And a laying step of laying the recycled asphalt concrete on the crushed road surface, wherein the crushing step and the recycling step are performed in a recycling vehicle traveling on the construction road, and the cement spraying step, the crushing step, and the recycling step. can provide a pavement repair method that is performed sequentially on a construction road.

According to embodiments of the present disclosure, the acquisition of waste asphalt concrete, the supply of asphalt, the supply of water, the supply of cement, and the production of recycled asphalt concrete can all be performed continuously on the construction road.

In addition, according to the embodiments of the present disclosure, the transport process for procuring asphalt concrete, the transport process for discharging waste asphalt concrete, and the high-temperature recycling process for waste asphalt concrete are all omitted, thereby reducing carbon emissions compared to the conventional road pavement construction method. It can be greatly reduced.

In addition, according to the embodiments of the present disclosure, it is possible to reduce waste disposal costs required for discharging and transporting waste asphalt concrete on existing roads.

Additionally, according to embodiments of the present disclosure, the curing time of a paved road can be shortened.

Additionally, according to embodiments of the present disclosure, the occurrence of cracks on the road surface can be reduced and the lifespan of the pavement can be increased.

The accompanying drawings, which are included as part of the detailed description to aid understanding of the embodiments, provide various embodiments and together with the detailed description describe technical features of the various embodiments.
1 is a diagram schematically showing an embodiment of a pavement repair method according to an embodiment of the present disclosure.
Figure 2 is a block diagram schematically showing a pavement repair method according to an embodiment of the present disclosure.
Figure 3 is a diagram schematically showing the room temperature recycling structure of the shredding module of a recycling vehicle and waste asphalt concrete for carrying out the pavement repair method according to an embodiment of the present disclosure.
Figure 4 is an enlarged view of part A of Figure 3
Figure 5 is a diagram schematically showing an expansion mixer used in a pavement repair method according to an embodiment of the present disclosure.
Figure 6 is a longitudinal cross-section of the upper part of the expansion mixer shown in Figure 5.
Figure 7 is a longitudinal cut perspective view of the expansion chamber of the expansion mixer shown in Figure 5
Figure 8 is an exploded perspective view of the lower part of the expansion mixer shown in Figure 5
Figure 9 is a longitudinal cross-section of the water supply nozzle of the expansion mixer shown in Figure 5
Figure 10 is a diagram schematically showing the structure of a construction vehicle for carrying out a pavement repair method according to an embodiment of the present disclosure.
Figure 11 is an enlarged view of part B of Figure 10
Figure 12 is a block diagram schematically showing the on-site mixing ratio determination step of the pavement repair method according to an embodiment of the present disclosure.

Hereinafter, specific embodiments of the present disclosure will be described with reference to the drawings. However, this is only an example and the present disclosure is not limited thereto.

In describing the present disclosure, if it is determined that a detailed description of known technology related to the present disclosure may unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of the functions in the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

The technical idea of the present disclosure is determined by the claims, and the following examples are merely a means to efficiently explain the technical idea of the present disclosure to those skilled in the art in the technical field to which the present disclosure pertains.

FIG. 1 is a diagram schematically showing an embodiment of a pavement repair method according to an embodiment of the present disclosure, and FIG. 2 is a block diagram schematically showing an embodiment of a pavement repair method according to an embodiment of the present disclosure.

Referring to Figures 1 and 2, the pavement repair method of recycling waste asphalt concrete at room temperature at a construction site to reduce carbon emissions according to an embodiment of the present disclosure is a predetermined method in which road repair is performed on the construction road (1). A cement spraying step (S10) of spraying cement along the direction, a step of crushing an existing road (S20) of obtaining waste asphalt concrete by crushing at least a portion of the road surface of the construction road (1) on which the cement (2) was sprayed (S20), a step of crushing (S20) ), an asphalt supply step (S30) of supplying asphalt to the waste asphalt obtained in the step (S20), and a water supply step (S40) of supplying water to the waste asphalt obtained in the crushing step (S20). A recycling step (S50) of obtaining recycled asphalt concrete by mixing the waste asphalt obtained in the crushing step (S20), the water supplied in the water supply step (S40), and the asphalt supplied in the asphalt supply step (S30), and the recycled asphalt concrete. It may include a laying step (S60) of laying on the crushed road surface (3).

In the cement spraying step (S10), cement can be spread by a cement supply vehicle (10) equipped with a cement tank. The cement supply vehicle 10 can be located at the forefront and drive on the construction road 1 where the road is being paved.

Asphalt in the asphalt supply step (S30) can be supplied by an asphalt supply vehicle (20) equipped with an asphalt tank (210). Water in the water supply step (S40) may be supplied by a water supply vehicle 30 equipped with a water tank 310. The asphalt supply vehicle 20 and the water supply vehicle 30 can be located behind the cement supply vehicle 10 and run on the construction road 1 where the road is being paved. The asphalt tank 210 may contain asphalt, and the asphalt tank 210 may be made of a material with high insulation performance. Additionally, an asphalt heating unit (not shown) may be provided in the asphalt tank 210, and the asphalt in the asphalt tank 210 may be maintained at a temperature range of 160 to 180° C. by the asphalt heating unit.

The crushing step (S20) and the recycling step (S50) may be performed in a recycling vehicle 40 traveling on the construction road 1. The recycling vehicle 40 can be located and run behind the asphalt supply vehicle 20 and the water supply vehicle 30 on the construction road 1 where the road is being paved.

The laying step (S60) may be performed by a laying vehicle 50 traveling on the construction road 1 behind the recycling vehicle 40.

That is, in a predetermined direction on the construction road 1 on which road paving is performed, the asphalt supply vehicle 20 and the water supply vehicle 30 may be located in front of the recycling vehicle 40, and the cement supply vehicle ( 10) can be located behind.

The asphalt supply vehicle 20 may include an asphalt tank 210 for receiving asphalt and an asphalt supply line 220 for supplying asphalt to the recycling vehicle 40. The asphalt supply line 220 can connect the asphalt supply vehicle 20 and the recycling vehicle 40. The water supply vehicle 30 may include a water tank 310 for holding water and a water supply line 320 for supplying water to the recycling vehicle 40. The water supply line 320 can connect the water supply vehicle 30 and the recycling vehicle 40.

While road paving is performed according to an embodiment of the present disclosure, the cement supply vehicle 10, the asphalt supply vehicle 20, the water supply vehicle 30, and the recycling vehicle 40 maintain the construction road 1. It can be driven continuously and sequentially along the determined direction.

As above, according to an embodiment of the present disclosure, the acquisition of waste asphalt concrete, the supply of asphalt, the supply of water, the supply of cement, and the production of recycled asphalt concrete can all be performed continuously on the construction road (1). Through this, the transport process for procuring asphalt concrete, the transport process for discharging waste asphalt concrete, and the high-temperature recycling process for waste asphalt concrete are all omitted, thereby significantly reducing carbon emissions compared to conventional road pavement construction methods.

In addition, the pavement repair method according to an embodiment of the present disclosure includes a first compaction step (S70) of flattening the recycled asphalt concrete laid in the laying step (S60), and a first compaction step (S70) of flattening the recycled asphalt concrete laid in the first compaction step (S70). It may further include a secondary compaction step (S80) of additionally flattening. The first compaction step (S70) and the laying step (S60) can both be performed in the above-described laying vehicle (50). Specific details about the installation vehicle 50 will be described later in the description of FIGS. 10 and 11 below.

The secondary compaction step (S80) may be performed by a flat roller vehicle (60) running on the construction road (1) behind the installation vehicle (50). The flattening roller vehicle 60 may be provided with a cylindrical flattening roller that rotates as it travels on the construction road 1, and the flattening roller is formed of a high weight, so that as the flattening roller vehicle 60 travels, the construction road 1 The recycled asphalt concrete laid on the bed can be flattened by pressurizing it.

Figure 3 is a diagram schematically showing the room-temperature recycling structure of the shredding module of the recycling vehicle 40 and waste asphalt concrete for carrying out the pavement repair method according to an embodiment of the present disclosure, and Figure 4 is an enlarged view of portion A of Figure 3. It is also a degree. 3 and 4, for convenience of explanation, the remaining components except the crushing module, foamed asphalt supply unit 410, water supply unit 420, and asphalt transport unit 450 of the recycling vehicle 40 have been deleted.

Referring to Figures 3 and 4, the asphalt supplied in the asphalt supply step (S30) may be supplied in the form of foamed asphalt. Foamed asphalt can be formed by mixing and expanding asphalt, water, and compressed air.

Foamed asphalt may be formed in an expansion mixer 412.

The recycling vehicle 40 includes a crushing module 430 that crushes at least a portion of the road surface of the construction road 1, a foamed asphalt supply unit 410 configured to supply foamed asphalt to the waste asphalt obtained by the crushing module 430, And it may include a water supply unit 420 configured to supply water to the waste asphalt concrete obtained by the crushing module 430.

The foamed asphalt supply unit 410 may be placed on the upper side of the crushing module 430. The water supply unit 420 may be disposed on the upper side of the crushing module 430.

The crushing module 430 includes a cylindrical crushing roller 431 with a rotation center axis disposed parallel to the ground, and is provided on the outer peripheral surface of the crushing roller 431 to crush at least a portion of the road surface of the construction road 1 as it rotates. It may include a plurality of cutting blades 432. The central axis of rotation of the crushing roller 431 may be arranged to be perpendicular to a predetermined direction on the construction road 1 on which road paving is performed. A plurality of cutting blades 432 may be formed to protrude outward in the radial direction from the outer peripheral surface of the cylindrical crushing roller 431.

The shredding module 430 may further include a rotating part (not shown) capable of rotating the shredding roller 431 about the central axis of rotation. The crushing roller 431 may be rotated in a rolling direction (that is, clockwise with respect to FIGS. 3 and 4) along a predetermined direction in which road paving is performed. As the crushing roller 431 is rotated by the rotating unit, the plurality of cutting blades 432 can cut the road surface on the cement-sprayed construction road 1 to a preset depth. As at least a portion of the road surface on the construction road 1 is cut, waste asphalt concrete that was paved on the existing road can be obtained.

In addition, each of the plurality of blades may be configured to move the cut waste asphalt concrete to the upper part of the crushing module 430 as the crushing roller 431 rotates. For example, each of the plurality of blades may be formed to have a predetermined thickness in a direction along the rotation center axis of the crushing roller 431. Additionally, each of the plurality of blades may be formed by bending or bending to form a curve along the direction in which the shredding roller 431 rotates when viewed from the longitudinal cross-section of the shredding roller 431. That is, each of the plurality of blades may be formed in a scoop shape to lift the cut waste asphalt concrete from the lower part of the ground side to the upper part of the crushing roller 431 as the crushing roller 431 rotates.

When the waste concrete is moved to the upper part of the crushing roller 431 by a plurality of blades, the cement previously spread on the ground may also be moved to the upper part of the crushing roller 431. The foamed asphalt supplied by the foamed asphalt supply unit 410 disposed at the top of the crushing roller 431 and the water supplied by the water supply unit 420 are supplied to the waste asphalt moved to the top of the crushing roller 431. You can. Through this, a recycling step (S50) can be performed in which waste asphalt concrete obtained by crushing the existing road, cement sprayed on the existing road, foamed asphalt, and water are mixed together to form recycled asphalt concrete.

Meanwhile, the mixing ratio between waste asphalt concrete, cement, foamed asphalt, and water can be determined in the on-site mixing ratio determination step (S100), which will be described later.

The recycling vehicle 40 may further include a module casing 440 in which a mixing space 441 in which the crushing roller 431 is disposed is formed. The module casing 440 may be provided with a mixing space 441 with an open bottom, and the outer surface of the mixing space 441 (i.e., the inner peripheral surface of the module casing 440) extends from the radial end of the crushing module 430. They may be placed at a predetermined distance apart.

The foamed asphalt supply unit 410 and the water supply unit 420 may be disposed on the upper part of the module casing 440. That is, the foamed asphalt supply unit 410 can supply foamed asphalt from the upper part of the module casing 440 to the upper part of the crushing module 430, and the water supply unit 420 can supply the foamed asphalt from the upper part of the module casing 440 to the crushing module 430. ) Water can be supplied to the upper part of the.

The crushing module 430 can be rotated within the mixing space 441. Waste asphalt concrete, cement, supplied foamed asphalt, and water, which are moved to the upper part of the crushing roller 431 by a plurality of blades, are moved to the crushing roller 431 within the mixing space 441 as the crushing module 430 rotates. They can be repeatedly moved along the outer circumferential surface and mixed with each other within the mixing space 441. That is, recycled asphalt concrete can be formed within the mixing space 441.

The volume of foamed asphalt can be expanded to 15 to 25 times, preferably 20 times, the volume of the asphalt raw material.

According to one embodiment of the present disclosure, asphalt is supplied and mixed with waste asphalt in the form of foamed asphalt, so that the viscosity of the asphalt decreases and the volume increases, so that recycled asphalt can be produced even at a relatively low temperature (room temperature temperature conditions). there is. That is, according to an embodiment of the present disclosure, high temperature (approximately 160°C) heating for recycling of conventional waste asphalt concrete is unnecessary, and carbon emissions generated during the fuel combustion process for high temperature heating can be greatly reduced.

In addition, according to an embodiment of the present disclosure, since recycled asphalt is not produced at a high temperature (about 160 ° C.), the curing time required for use of the pavement 4 after laying will be significantly shortened compared to the conventional road repair method. You can. In other words, the curing time of the pavement 4 can be shortened.

In addition, in the conventional asphalt regeneration method, voids such as air pockets were generated between the asphalt aggregate during the mixing process of the crushed asphalt and the supplied water. However, according to an embodiment of the present disclosure, the foamed asphalt was crushed into the asphalt aggregate. By filling the spaces in between, the occurrence of voids can be prevented and the adhesion between asphalt aggregates and asphalt can be improved. Through this, the occurrence of cracks on the road surface can be reduced and the lifespan of the pavement 4 can be increased.

Meanwhile, the recycling vehicle 40 may further include an asphalt concrete transfer unit 450 connected to one side of the module casing 440. The asphalt transport unit 450 may be located at the rear of the shredding module 430 in the traveling direction of the recycling vehicle 40 or the horizontal movement direction (i.e., a predetermined direction) of the shredding roller 431. In addition, the asphalt concrete transfer unit 450 may be provided with a transfer space 451 for transferring recycled asphalt concrete, and the transfer space 451 may be formed to extend to communicate with the mixing space 441. A transport member for transporting recycled asphalt concrete may be provided within the moving space. The conveying member may be formed as a conveyor belt or may be formed as a conveying screw.

A portion of the recycled asphalt concrete generated within the mixing space 441 and rotated along the circumferential direction of the crushing roller 431 can be moved to the transfer space 451, and the recycled asphalt concrete moved to the transfer space 451 is a transfer member. It can be transferred to the rear end of the recycling vehicle 40 and delivered to the installation vehicle 50 running behind the recycling vehicle 40.

The asphalt concrete transfer unit 450 may be provided with an asphalt concrete heating unit (not shown). The asphalt heating unit may be configured to heat the inside of the transfer space 451, and may preferably be configured to heat to 50°C to 80°C. Through this, the adhesion between the concrete aggregates included in the waste asphalt by foamed asphalt can be increased, and the overall temperature of the recycled asphalt can be equalized. Therefore, when paving a road using recycled asphalt concrete, the pavement 4 can be uniformly hardened overall and maintain consistent quality.

In addition, since the transfer space 451 of the asphalt concrete transfer unit 450 is heated, the problem of the recycled asphalt concrete hardening during transport or the recycled asphalt concrete sticking to the asphalt concrete transfer unit 450 can be prevented.

In addition, the foamed asphalt supply unit 410 may be provided with an asphalt supply cover 411 and a plurality of expansion mixers 412. Foamed asphalt may be formed in a plurality of expansion mixers 412 provided in the foamed asphalt supply unit 410, and the foamed asphalt may be supplied to the waste asphalt side below the foamed asphalt supply unit 410. A plurality of expansion mixers 412 may be provided within the asphalt supply cover 411, and the asphalt supply line 220 may extend into the asphalt supply cover 411 through the upper surface of the asphalt supply cover 411. The end of the asphalt supply line 220 may be branched within the asphalt supply cover 411 and connected to each of the plurality of expansion mixers 412.

The asphalt supply cover 411 may be formed in a rectangular parallelepiped shape, and the long axis direction (i.e., longitudinal direction) of the asphalt supply cover 411 may be positioned parallel to the central axis of rotation of the crushing roller 431. A plurality of expansion mixers 412 may be aligned and arranged within the asphalt supply cover 411 along the longitudinal direction of the asphalt supply cover 411. The foamed asphalt produced in the plurality of expansion mixers 412 may be discharged to the lower side of the asphalt supply cover 411 and supplied to the crushing module 430 at the lower side.

Figure 5 is a diagram schematically showing the expansion mixer 412 used in the pavement repair method according to an embodiment of the present disclosure, and Figure 6 is a diagram showing a longitudinal cross-section of the upper part of the expansion mixer 412 shown in Figure 5. , FIG. 7 is a longitudinal cut perspective view of the expansion chamber 4122 of the expansion mixer 412 shown in FIG. 5, and FIG. 8 is an exploded perspective view of the lower part of the expansion mixer 412 shown in FIG. 5.

5 to 8, each of the plurality of expansion mixers 412 includes an asphalt providing unit 4121, an expansion chamber 4122, a water providing unit 4123, a compressed air providing unit 4124, and an asphalt discharge unit. (4125) may be included.

The asphalt providing unit 4121 is connected to the end of the asphalt supply line 220 and can receive asphalt from the asphalt tank 210. One side of the expansion chamber 4122 may be connected to the end of the asphalt providing part 4121 and may be hollow. The water provider 4123 may be configured to supply water at a pressure higher than a predetermined pressure into the expansion chamber 4122. The compressed air provider 4124 may be configured to supply compressed air at a predetermined pressure or higher into the expansion chamber 4122. The asphalt discharge unit 4125 may be connected to the other side of the expansion chamber 4122 and may be configured to discharge foamed asphalt formed within the expansion chamber 4122.

The asphalt providing unit 4121, the expansion chamber 4122, and the asphalt discharging unit 4125 may be connected to each other to form a jar-shaped structure having a predetermined length. That is, the diameter may gradually increase as it moves from the asphalt providing unit 4121 to the expansion chamber 4122, and then gradually decrease in diameter as it moves from the expansion chamber 4122 to the asphalt discharge unit 4125. Additionally, the asphalt providing unit 4121, the expansion chamber 4122, and the asphalt discharging unit 4125 may be arranged to stand so that their longitudinal direction is positioned perpendicular to the ground.

At least a portion of the asphalt providing part 4121 may be formed in a hollow cylindrical shape so that an asphalt flow path is formed therein. The asphalt providing unit 4121 may be provided with a heating unit 4126 for heating at least a portion of the inner and outer surfaces of the asphalt providing unit 4121.

The asphalt providing part 4121 includes a first providing part 4121a formed in a hollow cylindrical shape, and a second providing part formed in a cone shape whose diameter gradually increases from one side connected to the first providing part 4121a to the other side. (4121b). The first providing part 4121a and the second providing part 4121b may be formed as an integrated structure. The heating unit 4126 may be provided in the first providing unit 4121a of the asphalt providing unit 4121.

The water supply unit 4123 includes a water supply nozzle 4123a configured to supply water above a predetermined pressure into the expansion chamber 4122, and a water transfer line 4123b for transferring water to the water supply nozzle 4123a. can do. The compressed air provider 4124 includes an air supply nozzle 4124a configured to supply compressed air above a predetermined pressure into the expansion chamber 4122, and an air transfer line 4124b that transfers compressed air to the air supply nozzle 4124a. ) may include. The water transfer line (4123b) may be coupled to the rear end of the water supply nozzle (4123a), and the air transfer line (4124b) may be coupled to the rear end of the air supply nozzle (4124a).

The water supply nozzle 4123a and the air supply nozzle 4124a may be disposed on one side of the second provision part 4121b, penetrating a portion of the wall of the second provision part 4121b. Additionally, the water supply nozzle 4123a and the air supply nozzle 4124a may be disposed to be inclined at a predetermined angle with respect to the longitudinal direction of the cylindrical first providing portion 4121a. That is, the water supply nozzle 4123a can inject water inclined at a predetermined angle with respect to the asphalt flowing within the first providing part 4121a, and the air supply nozzle 4124a can spray water within the first providing part 4121a. Compressed air can be injected obliquely at a predetermined angle with respect to the flowing asphalt.

At least a portion of the water transfer line 4123b may be wound in a spiral shape along the outer peripheral surface of the cylindrical first providing portion 4121a. Through this, the water supplied by the water providing part 4123 can flow along the outer peripheral surface of the first providing part 4121a of the asphalt providing part 4121 and then be injected into the expansion chamber 4122, and the first It may be heated by the heating unit 4126 in the process of flowing along the outer peripheral surface of the providing unit 4121a. Asphalt flowing through the asphalt providing unit 4121 may be heated by the heating unit 4126. Through this, it is possible to prevent the quality of the road pavement from deteriorating due to cooling during the process of transferring the asphalt from the asphalt tank 210 through the asphalt supply line 220, and to prevent the asphalt from being cooled during the process of being transferred from the asphalt tank 210 through the asphalt supply line 220. The formation of foamed asphalt can be promoted by heating. That is, the asphalt flowing into the expansion chamber 4122 through the asphalt providing unit 4121 may be heated to a temperature of 160 to 180°C.

The asphalt providing part 4121 may be rotatably coupled to one end of the expansion chamber 4122 about the longitudinal central axis of the expansion chamber 4122, and the asphalt discharge part 4125 may be rotatably coupled to one end of the expansion chamber 4122. It may be rotatably coupled to the end about the longitudinal central axis of the expansion chamber 4122. Bearings 4127 may be provided at the connection portion between the asphalt providing portion 4121 and the expansion chamber 4122 and at the connecting portion between the asphalt discharge portion 4125 and the expansion chamber 4122. Through this, the expansion chamber 4122 can be rotated independently with respect to the asphalt providing part 4121 and the asphalt discharging part 4125.

Preferably, the asphalt providing part 4121 and the asphalt discharging part 4125 can be positioned in a fixed state within the asphalt supply cover 411, and the expansion chamber 4122 includes the asphalt providing part 4121 and the asphalt discharging part. It may be configured to rotate about its longitudinal central axis with respect to (4125).

In addition, the expansion chamber 4122 includes a chamber housing 4122a hollowly formed in the shape of a rugby ball having different diameters along the longitudinal direction, a belt coupling groove 4122b formed along the circumferential direction on the outer surface of the chamber housing 4122a, and a chamber housing 4122a. It may include a plurality of stirring vanes (4122c) extending along the inner peripheral surface of the housing (4122a).

A plurality of stirring vanes 4122c may be arranged to be spaced apart along the longitudinal direction of the expansion chamber 4122 on the inner peripheral surface of the chamber housing 4122a. A plurality of stirring vanes 4122c may be formed to protrude at a predetermined height from the inner peripheral surface of the chamber housing 4122a. Each of the plurality of stirring vanes 4122c may be inclined to have a predetermined inclination angle with respect to the longitudinal direction of the expansion chamber 4122.

Each expansion mixer 412 is coupled to a rotary belt 4128c engaged with the belt coupling groove 4122b, a rotary drive unit 4128a provided to rotate the rotary belt 4128c, and a rotary belt 4128c. It may include a rotation gear (4128b) rotated by the rotation drive unit (4128a). The rotating belt 4128c may be composed of an endless member with engaging members provided on the inside. The rotation drive unit 4128a may be configured as a step motor, and the rotation gear 4128b may be rotated by the rotation drive unit 4128a. The rotation gear 4128b may be engaged with one side of the rotation belt 4128c, and the rotation gear 4128b may rotate the rotation belt 4128c in a predetermined direction as it is rotated by the rotation drive unit 4128a.

The belt coupling groove 4122b of the expansion chamber 4122 may be provided at a longitudinal center position on the outer surface of the chamber housing 4122a, and expands meshed with the other side of the rotating belt 4128c when the rotating belt 4128c rotates. Chamber 4122 can be rotated about its longitudinal central axis.

Asphalt, water, and compressed air supplied into the expansion chamber 4122 may flow and be stirred in a spiral shape along the stirring vane 4122c provided along the inner peripheral surface of the expansion chamber 4122 as the expansion chamber 4122 rotates. . Through this, the flow time for mixing asphalt, water, and compressed air within the expansion chamber 4122 can be increased, and a sufficient amount of foamed asphalt can be formed even in the expansion chamber 4122 with a smaller volume than before. Through this, the overall volume size of the expansion mixer 412 can be reduced.

The heating unit 4126 described above includes a first heat dissipation cover 4126a disposed inside the first provision portion 4121a, and a second heat dissipation cover 4126b disposed outside the first provision portion 4121a. And it may include a heating coil (4126c) disposed between the first heat dissipation cover (4126a) and the second heat dissipation cover (4126b). The first heat dissipation cover 4126a and the second heat dissipation cover 4126b may be formed in hollow cylindrical shapes with different diameters. The diameter of the second heat dissipation cover 4126b may be formed to be larger than the diameter of the first heat dissipation cover 4126a, and the first heat dissipation cover 4126a and the second heat dissipation cover 4126b may be arranged coaxially. .

The first heat dissipation cover 4126a and the second heat dissipation cover 4126b may be made of a material with high thermal conductivity, for example, aluminum (Al). The heating coil 4126c may be matched to be in contact with the first heat dissipation cover 4126a and the second heat dissipation cover 4126b. Meanwhile, the empty space between the first heat dissipation cover (4126a) and the heating coil (4126c) and the empty space between the second heat dissipation cover (4126b) and the heating coil (4126c) may be filled with a heat conductive member made of a resin material. For example, the heat conductive member may be epoxy resin.

Additionally, the first heat dissipation cover 4126a may form the inner peripheral surface of the first providing part 4121a, and the second heat dissipating cover 4126b may form the outer peripheral surface of the first providing part 4121a. The heating coil 4126c may be provided in a solenoid-shaped state wound between the first heat dissipation cover 4126a and the second heat dissipation cover 4126b, and generates heat as current is applied to the first heat dissipation cover 4126a and the second heat dissipation cover 4126b. It may be configured to heat the second heat dissipation cover (4126b).

When the first heat dissipation cover (4126a) and the second heat dissipation cover (4126b) are heated by the heating coil (4126c), the inner space of the first providing part (4121a) may be heated by the first heat dissipation cover (4126a). there is. Through this, the asphalt flowing into the asphalt providing unit 4121 can be heated. Additionally, the surrounding peripheral surface of the first providing part 4121a may be heated by the second heat dissipation cover 4126b. Preferably, the water transfer line (4123b) wound around the outer peripheral surface of the first providing part (4121a) can be heated by the second heat dissipation cover (4126b).

Water supplied into the expansion chamber 4122 through the water provider 4123 may be heated by the second heat dissipation cover 4126b while flowing through the water transfer line 4123b. Preferably, the water may be heated to a temperature range higher than room temperature but lower than the boiling point in the process of flowing through the water transfer line (4123b), and the heated water may be supplied into the expansion chamber (4122) by the water supply nozzle (4123a). It can be sprayed and mixed with asphalt.

Water can be vaporized in contact with heated asphalt, and as the water vaporized into water vapor and asphalt are mixed, a large number of microbubbles can be formed in the asphalt, and the asphalt can expand accordingly, forming foamed asphalt. there is. Additionally, as compressed air is supplied into the expansion chamber 4122, the expansion of asphalt can be further promoted.

Meanwhile, the above-mentioned water is supplied in a heated state by the second heat dissipation cover 4126b, so the evaporation rate of water can be increased and the production rate of foamed asphalt can be further increased. In addition, according to an embodiment of the present disclosure, the water transfer line 4123b is heated using the external heat radiation of the heating unit 4126 for heating the asphalt providing unit 4121, and a separate heater for heating water is used. Since there is no need to provide a section, the overall volume of the expansion mixer 412 can be reduced.

The asphalt discharge portion 4125 includes a first discharge portion 4125a formed in a hollow cylindrical shape, and a second discharge portion formed in a cone shape whose diameter gradually increases from one side connected to the first discharge portion 4125a to the other side. (4125b). The first discharge part 4125a and the second discharge part 4125b may be formed as an integrated structure. One longitudinal end of the second discharge portion 4125b may be connected to the first discharge portion 4125a, and the other longitudinal end of the second discharge portion 4125b may be rotatably coupled to the lower end of the expansion chamber 4122. You can.

Additionally, a plurality of vibrators 4125c may be disposed on the outer surface of the first discharge part 4125a to generate vibration in the first discharge part 4125a. The vibrator 4125c may be formed in a ring shape and disposed along the outer peripheral surface of the first discharge portion 4125a, and the plurality of vibrators 4125c may be arranged to be spaced apart from each other along the longitudinal direction of the first discharge portion 4125a. You can. As vibration is generated in the first discharge unit 4125a by the plurality of vibrators 4125c, mixing of foamed asphalt passing through the first discharge unit 4125a can be further promoted, and the production rate of foamed asphalt is further increased. It can be.

The asphalt discharge part 4125 includes two fixing parts 4125d disposed at one end and the other end in the longitudinal direction of the first discharge part 4125a, respectively, and a guide screw 4125e disposed between the two fixing parts 4125d. may include.

The guide screw 4125e may be arranged in a restrained state by two fixing parts 4125d disposed at the top and bottom of the first discharge part 4125a, and may provide a spiral flow to the foamed asphalt moving from the top to the bottom. It can be induced.

Specifically, each fixing part 4125d includes a ring-shaped fastened part 4125-1d, a ring-shaped fixing ring 4125-2d having a diameter larger than the diameter of the fastened part 4125-1d, and It may include a plurality of inclined vanes (4125-3d) provided between the fastened portion (4125-1d) and the fixing ring (4125-2d). The outer peripheral surface of the fixing ring (4125-2d) may be coupled to the inner peripheral surface of the top of the first discharge portion (4125a). The fixing ring (4125-2d) and the fastened portion (4125-1d) may be arranged parallel to the ground. A thread may be formed on the inner peripheral surface of the fastened portion 4125-1d, and the longitudinal end of the guide screw 4125e may be inserted and screwed into the fastened portion 4125-1d.

The plurality of inclined vanes (4125-3d) may be formed in a plate shape and may be arranged to have a predetermined inclination with respect to the plane on which the fixing ring (4125-2d) is disposed. That is, some of the foamed asphalt flowing into the first discharge unit 4125a may interfere with the plurality of inclined vanes 4125-3d and then move downward along the slope of the inclined vanes 4125-3d.

In addition, the guide screw 4125e includes a screw shaft 4125-1e formed to have a predetermined length along the longitudinal direction of the first discharge portion 4125a, and a stirring wing 4125-2e provided on the screw shaft 4125-1e. ), and fastening members 4125-3e provided at both ends of the screw shaft 4125-1e in the longitudinal direction. A thread may be formed in the fastening member 4125-3e, and the fastening members 4125-3e at both ends are fastened portions of the two fixing parts 4125d disposed at the upper and lower ends of the first discharge portion 4125a ( 4125-1d) can be respectively screwed together.

The stirring blade (4125-2e) may be formed in a continuous spiral shape on the screw shaft (4125-1e) to induce more efficient mixing of asphalt, water, and compressed air. Furthermore, the stirring blade (4125-2e) may be provided to have an upward gradient starting from a horizontal direction orthogonal to the screw axis (4125-1e). As asphalt, water, and compressed air move along the stirring blade (4125-2e), mixing between them is further promoted, and the production rate of foamed asphalt can be further improved. In addition, as the foamed asphalt moves along the spiral screw axis (4125-1e), the mixing time of asphalt, water, and compressed air can be further extended.

The asphalt discharge unit 4125 may further include a high pressure injection unit 4125f connected to the lower end of the first discharge unit 4125a. The high-pressure injection unit 4125f may be configured to spray a mixture of asphalt, water, and compressed air at high pressure toward the crushing module 430 disposed below. The high pressure injection unit 4125f may be connected to the lower end of the first discharge unit 4125a in fluid communication with the first discharge unit 4125a. The mixture of asphalt, water, and compressed air transferred to the first discharge unit 4125a is sprayed by the high pressure injection unit 4125f and may be expanded and sprayed in the form of foamed asphalt.

Some of the foamed asphalt mixed with the waste asphalt concrete may be formed in the expansion chamber 4122 and the asphalt discharge unit 4125, and the remaining part of the foamed asphalt mixed with the waste asphalt concrete may be formed by being sprayed by the high pressure injection unit 4125f. It can be.

Meanwhile, an induction coil (not shown) may be further provided outside the first discharge portion 4125a to heat the guide screw 4125e using an induction heating method. The screw shaft 4125-1e and the stirring blade 4125-2e of the guide screw 4125e may be heated by the induction coil. Through this, the production rate of foamed asphalt can be further improved.

The water supply unit 420 may include a plurality of water injection members 421 configured to spray a preset amount of water from the upper side of the crushing module 430 toward the crushing module 430. The end of the water supply line 320 may be branched within the water supply unit 420 and connected to each of the plurality of water spray members 421. That is, the water transported by the water supply line 320 may flow to the plurality of water injection members 421, and is converted into crushed asphalt concrete on the upper side of the crushing module 430 by the plurality of water injection members 421. A set amount of water can be supplied. The amount of water supplied may be preset by the user, and may be determined and set based on the mixing ratio determined in the on-site mixing ratio determination step (S100), which will be described later.

Meanwhile, the asphalt providing unit 4121, the expansion chamber 4122, and the asphalt discharge unit 4125 may be made of carbon steel or stainless steel. An anti-corrosion coating layer may be formed on the inner surfaces of the asphalt providing part 4121, the expansion chamber 4122, and the asphalt discharging part 4125. The above-mentioned anti-corrosion coating layer can be formed of polytetra fluoroethylene (PTFE), a fluoropolymer, and can improve corrosion resistance and resistance to asphalt.

FIG. 9 is a longitudinal cross-section of the water supply nozzle 4123a of the expansion mixer 412 shown in FIG. 5.

Referring to FIG. 9, the water supply nozzle 4123a is a hollow cylindrical first nozzle housing 4123-1a connected to the end of the water transfer line 4123b, and extends from the first nozzle housing 4123-1a. a hollow conical second nozzle housing (4123-2a), an inflow valve seat (4123-3a) provided at one end in the longitudinal direction of the first nozzle housing (4123-1a) (the end on the water transfer line (4123b) side), 1 A piston rod (4123-4a) provided in the nozzle housing (4123-1a) and configured to move along the longitudinal direction of the first nozzle housing (4123-1a), one end (inlet valve) in the longitudinal direction of the piston rod (4123-4a) An inlet valve member 4123-5a provided at the end adjacent to the seat 4123-3a, and an outlet provided at the other longitudinal end of the piston rod 4123-4a (the end adjacent to the second nozzle housing 4123-2a). It may include a valve member (4123-6a).

The first nozzle housing (4123-1a), the second nozzle housing (4123-2a), and the inlet valve seat (4123-3a) may be formed as an integrated structure. The second nozzle housing 4123-2a may be formed so that its diameter gradually decreases from one side connected to the first nozzle housing 4123-1a to the other side located toward the inside of the expansion chamber 4122. An open outlet may be formed at the other end of the second nozzle housing (4123-2a). Additionally, a circular inlet may be formed through the central radius of the inlet valve seat 4123-3a. Water flowing through the water transfer line (4123b) may be moved into the first nozzle housing (4123-1a) through the inlet. Water that has passed through the first nozzle housing (4123-1a) and the second nozzle housing (4123-2a) may be sprayed into the expansion chamber 4122 through the discharge port.

The inlet valve member (4123-5a), the piston rod, and the discharge valve member (4123-6a) may be formed as an integrated structure and may be configured to move linearly along the longitudinal direction of the first nozzle housing (4123-1a). there is. The inlet valve member 4123-5a may be formed in a plate shape and may be provided inside the first nozzle housing 4123-1a. The discharge valve member 4123-6a may be formed in a spherical shape and may be located outside the second nozzle housing 4123-2a.

The inlet valve member 4123-5a may be positioned to contact the inlet valve seat 4123-3a at one end of the piston rod 4123-4a in the longitudinal direction to close the inlet. The discharge valve member 4123-6a may be positioned to contact the end of the second nozzle housing 4123-2a at the other end in the longitudinal direction of the piston rod 4123-4a and may be configured to close the discharge port. Meanwhile, when the piston rod moves linearly, the inlet valve member (4123-5a) is spaced apart from the inlet valve seat (4123-3a) to open the inlet, and the outlet valve member (4123-6a) is connected to the second nozzle housing. The outlet may be opened spaced apart from the end of 4123-2a.

The water supply nozzle (4123a) includes a raising and lowering member (4123-9a) located between the inlet valve member (4123-5a) and the discharge valve member (4123-6a) inside the first nozzle housing (4123-1a), And an elastic member (4123-7a) disposed between the raising and lowering member (4123-9a) and the inlet valve member (4123-5a) to press the inlet valve member (4123-5a) toward the inlet valve seat (4123-3a). More may be included.

The elastic pressing force of the elastic member (4123-7a) that presses the inlet valve member (4123-5a) toward the inlet valve seat (4123-3a) may be of a size corresponding to the predetermined pressure of the water supplied into the expansion chamber (4122). When the water flowing through the water in the water transfer line (4123b) flows above a predetermined pressure, the water above the predetermined pressure overcomes the elastic pressing force of the elastic member (4123-7a) and flows through the inlet valve member (4123-5a). ) can be pushed toward the raising and lowering member (4123-9a) and pass through the inlet.

The lifting member 4123-9a may be formed in a ring shape with a through hole formed in the center. The piston rod (4123-4a) may be positioned through the through hole, and there may be no interference between the piston rod (4123-4a) and the lifting member (4123-9a). The elastic member (4123-7a) may be a spring member with elastic restoring force, and one end of the elastic member (4123-7a) faces the inlet valve seat (4123-3a) on the outer surface of the raising and lowering member (4123-9a). It may be supported in contact with the outer surface, and the other end of the elastic member (4123-7a) may be supported in contact with the outer surface of the inlet valve seat (4123-3a) facing the elevating member (4123-9a).

The water supply nozzle (4123a) may further include a pressure adjustment member (4123-8a) coupled to the elevating member (4123-9a) and configured to fix the position of the elevating member (4123-9a). The pressure adjustment member 4123-8a may be formed in a ring shape, and the pressure adjustment member 4123-8a may be positioned coupled to the first nozzle housing 4123-1a with a portion of the outer surface exposed to the outside. You can. Preferably, the pressure adjustment member 4123-8a may be arranged on the first nozzle housing 4123-1a to be rotatable about the longitudinal central axis of the first nozzle housing 4123-1a. The outer peripheral surface of the pressure adjustment member 4123-8a can be held and rotated by the user.

A thread may be formed on the inner peripheral surface of the pressure adjustment member (4123-8a), and a thread having a complementary shape to the thread of the pressure adjustment member (4123-8a) may be formed on the outer peripheral surface of the elevating and lowering member (4123-9a). there is. The inner peripheral surface of the pressure adjustment member (4123-8a) may be mutually screwed to the outer peripheral surface of the raising and lowering member (4123-9a).

Additionally, the lifting member 4123-9a may be provided with a bar-shaped guide groove 4123-10a penetrating along the longitudinal direction of the first nozzle housing 4123-1a. Inside the first nozzle housing (4123-1a), a pair of bar-shaped raising and lowering guides (4123-11a) extend from the inlet valve seat (4123-3a) along the longitudinal direction of the first nozzle housing (4123-1a). ) can be provided. A pair of elevating and lowering guides (4123-11a) can be inserted and positioned within the pair of guide grooves (4123-10a), and each elevating and lowering guide (4123-11a) is connected to each guide groove (4123-10a). It can be moved along the longitudinal direction of the guide groove (4123-10a). Meanwhile, a pair of raising and lowering guides (4123-11a) are inserted into a pair of guide grooves (4123-10a), so the circumferential rotation of the lowering member (4123-9a) may be restricted due to interference.

Through this, when the pressure adjustment member (4123-8a) is rotated by the user, the raising and lowering member (4123-9a) can be moved along the longitudinal direction of the first nozzle housing (4123-1a), and accordingly the elastic member By changing the length of (4123-7a), the elastic restoring force of the elastic member (4123-7a) can be adjusted. That is, the elastic pressing force of the elastic member (4123-7a) that presses the inlet valve member (4123-5a) toward the inlet valve seat (4123-3a) can be adjusted by rotating the pressure control member (4123-8a). . Accordingly, the user can easily and intuitively adjust the pressure of water supplied into the expansion chamber 4122.

Meanwhile, the air supply nozzle 4124a may also be formed to have the same structure and configuration as the water supply nozzle 4123a described above. Detailed explanations will be omitted.

FIG. 10 is a diagram schematically showing the structure of a construction vehicle 50 for performing a pavement repair method according to an embodiment of the present disclosure, and FIG. 11 is an enlarged view of portion B of FIG. 10.

10 and 11, the construction vehicle 50 includes a vehicle body 510 running on a construction road 1, a hopper member 520 located in front of the vehicle body 510, and a hopper member 520. ), a laying member 530 provided to communicate with the lower part of the vehicle body 510, a flattening member 540 provided at the rear of the laying member 530 at the lower part of the vehicle body 510, and a laying member 530 at the lower part of the vehicle body 510. It may include a laying screw 560 provided on the lower side, and a pressure flattening part 550 provided at the rear of the laying member 530 and the laying screw 560 in the lower part of the vehicle body 510.

The hopper member 520 may be hollow, and the upper surface of the hopper member 520 may be open. The hopper member 520 may be configured to receive and accommodate the recycled asphalt concrete transferred from the asphalt concrete transfer unit 450.

The laying member 530 may be provided on the rear side of the vehicle body 510 at the lower part of the vehicle body 510, and the laying member 530 is hollow and communicates with the lower part of the hopper member 520 and has an open lower surface. It can be configured in the following form. The laying member 530 may be provided to communicate with the hopper member 520. Through this, the recycled asphalt concrete accommodated in the hopper member 520 can be moved rearward through the vehicle body 510 and laid on the ground through the hopper member 520. In addition, the laying member 530 may be formed to have a preset length in the width direction of the vehicle body 510, and the preset length of the laying member 530 may be in the construction area where paving is performed on the construction road 1. It can correspond to the width size. In addition, the lower surface of the installation member 530 may be configured to be opened or closed by an opening and closing drive unit (not shown) provided on the vehicle body 510, and the opening degree of the lower surface of the installation member 530 is adjusted by the opening and closing drive unit. The amount of reclaimed asphalt concrete laid on the crushed road surface (3) can be adjusted.

The flattening member 540 may be formed in a plate shape and may be configured to protrude downward from the lower surface of the vehicle body 510. The flattening member 540 may be arranged to stand vertically on the ground. In addition, the flattening member 540 may be provided at the rear of the laying member 530 so that the recycled asphalt concrete discharged from the laying member 530 contacts and interferes with it. The flattening member 540 may be formed to have a preset length in the width direction of the vehicle body 510, and the preset length of the flattening member 540 is the width size of the construction area where paving is performed on the construction road 1. can correspond to .

Additionally, the distal end (ie, lower end) of the flattening member 540 may be arranged to be spaced apart from the road surface at a predetermined height. The height of the distal end of the leveling member 540 from the road surface may substantially correspond to the height of the paved road 4 when the road paving is completed. When the vehicle body 510 is traveling, the recycled asphalt concrete laid on the ground may come into contact with the flattening member 540 and be flattened to the height of the distal end of the flattening member 540.

The laying screw 560 may be provided on the lower side of the laying member 530 so that the recycled asphalt concrete discharged from the laying member 530 contacts and interferes with it. The laying screw 560 is formed to have a predetermined length along the width direction of the vehicle body 510 and may be arranged parallel to the ground. The laying screw 560 can be rotated about its longitudinal central axis by a screw rotating part (not shown), and as the laying screw 560 rotates, the recycled asphalt concrete discharged from the laying member 530 can be stirred. there is. Through this, some of the recycled asphalt concrete contained in the hopper member 520 hardens into a lumped state, thereby preventing the problem of irregularities being formed on the road surface when paving the road.

The pressure flattening portion 550 may be provided on the lower surface of the vehicle body 510. The pressure flattening unit 550 may include a pressure bar 551, a raising and lowering shaft 552, a first eccentric rotation shaft 553, and a second eccentric rotation shaft 554.

The pressure bar 551 may be formed to have a preset length in the width direction of the vehicle body 510, and the preset length of the flattening member 540 is the width size of the construction area where paving is performed on the construction road 1. can correspond to .

The raising and lowering shaft 552 may be coupled to the upper part of the pressure bar 551. The pressure bar 551 and the raising and lowering shaft 552 may repeatedly move up and down in a direction perpendicular to the ground by the rotation of the first eccentric rotation shaft 553 and the second eccentric rotation shaft 554. At this time, the lower surface of the pressure bar 551 can contact and pressurize the surface of the reclaimed asphalt concrete that has been flattened by the flattening member 540. The pressure bar 551 is formed to a length corresponding to the width size of the construction area where paving is performed on the construction road 1. When the pressure bar 551 is moved up and down once, it is located across the entire width of the construction area. The recycled asphalt concrete can be pressed and compacted. That is, the above-described first compaction step (S70) of recycled asphalt concrete laid on the ground can be performed.

A plurality of raising and lowering shafts 552 may be provided, and the plurality of raising and lowering shafts 552 may be arranged to be spaced apart from each other along the longitudinal direction of the pressing bar 551.

The first eccentric rotation shaft 553 and the second eccentric rotation shaft 554 may have a circular cross-section, and may be arranged so that their central axes are eccentric to each other. Additionally, the second eccentric rotation shaft 554 may be configured to rotate about its central axis by a rotation driver (not shown). The first eccentric rotation shaft 553 may be coupled to the second eccentric rotation shaft 554 and configured to eccentrically rotate around the central axis of the second eccentric rotation shaft 554 when the second eccentric rotation shaft 554 rotates.

A plurality of raising and lowering shafts 552 may be coupled to the first eccentric rotation shaft 553 through bearings (not shown). That is, even if the first eccentric rotation shaft 553 rotates around the central axis of the second eccentric rotation shaft 554, the raising and lowering shaft 552 and the pressure bar 551 only rise and fall in the direction perpendicular to the ground. It may not rotate together with the eccentric rotation axis 553.

Since various types of eccentric coupling structures can be applied between the first eccentric rotation shaft 553 and the second eccentric rotation shaft 554, detailed descriptions thereof will be omitted.

Meanwhile, the raising and lowering shaft 552 is a two-bar link so that the pressure bar 551 can move linearly in the direction perpendicular to the ground by the rotation of the first eccentric rotation shaft 553 and the second eccentric rotation shaft 554. It may be composed of a structure (not shown). That is, even if one of the lifting and lowering shafts 552 of the two-bar link coupled to the first eccentric rotation shaft through a bearing rotates at a predetermined angle simultaneously with the lifting and lowering, the remaining one of the lifting and lowering shafts 552 of the two-bar link The link section can move linearly in a vertical direction together with the pressure bar 551.

According to one embodiment of the present disclosure, the first compaction step (S70) is performed in the laying vehicle 50 before the recycled asphalt concrete produced at room temperature is laid and quickly hardened, so that the degree of flatness on the pavement 4 is It can be further improved, and the quality of road repair can be further improved, such as by preventing irregularities from occurring on the surface of the paved road (4).

Figure 12 is a block diagram schematically showing the on-site mixing ratio determination step (S100) of the pavement repair method according to an embodiment of the present disclosure.

Referring to FIG. 12, the pavement repair method according to an embodiment of the present disclosure includes waste asphalt obtained in the crushing step (S20), foamed asphalt supplied in the asphalt supply step (S30), and water supply step (S40). An on-site mixing ratio determination step (S100) of determining the mixing ratio of the supplied water may be further included.

The on-site mixing ratio determination step (S100) is a sampling step (S110) in which a portion of the road surface of the construction road 1 is cut to collect a plurality of test samples, and foamed asphalt and water of different mixing ratios are supplied to each of the plurality of test samples. A sample recycling step (S120) of obtaining a recycled asphalt sample, a testing step (S130) of performing a plurality of physical property tests on each of the plurality of recycled asphalt samples obtained in the sample recycling step, and a plurality of recycled asphalt samples in the test step. It may include a mixing ratio determination step (S140) in which the mixing ratio of waste asphalt concrete, foamed asphalt, and water is determined based on the results of a plurality of physical property tests performed on the mixture.

According to an embodiment of the present disclosure, the mixing ratio of waste asphalt concrete, foamed asphalt, and water for generating reclaimed asphalt can be changed and applied depending on the condition of the construction road 1 on which road repair is performed.

The plurality of physical property tests performed in the above-described test step (S130) may include at least two of a Marshall stability test, an indirect tensile strength test, and a toughness test. According to the test results of a plurality of recycled asphalt concrete samples for which a plurality of physical property tests were performed in the test step (S130), the mixing ratio of the recycled asphalt samples meeting the preset standard performance in each physical property test was changed to the waste asphalt concrete to be used in the recycling step (S50). , can be adopted as the mixing ratio of foamed asphalt and water.

Through this, the quality of road pavement can be improved by applying the optimal mixing ratio of waste asphalt, foamed asphalt, and water according to the characteristics of each site.

In addition, according to an embodiment of the present disclosure, the mixing ratio of waste asphalt concrete, foamed asphalt, and water determined in the on-site mixing ratio determination step (S100) may be divided by site location and stored in the memory of a separately provided server. At this time, the composition of the test sample collected in the sampling step (S110) for each site location, information on the particle size of the aggregate, etc. may be stored together.

When performing road repairs at separate different sites, the user may use the composition of the test sample collected in the sampling step (S110) of the first site and the composition of the test sample collected from a second site where the particle size of the aggregate is already stored, and If the particle size information of the aggregate is the same, the sample recycling step (S120) and the test step (S130) are omitted, and the mixing ratio of waste asphalt, foamed asphalt, and water determined in the mixing ratio determination step (S140) at the second site is the same at the first site. It can be used appropriately.

Through this, even when road repairs are performed at different sites, the optimal mixing ratio of waste asphalt concrete, foamed asphalt, and water suitable for the characteristics of the site can be applied, and the on-site mixing ratio determination step (S100) for deriving the mixing ratio is greatly shortened. The time required for overall road repair can be greatly reduced.

Although the present disclosure has been described in detail through representative embodiments above, those skilled in the art will recognize that various modifications can be made to the above-described embodiments without departing from the scope of the present disclosure. You will understand. Therefore, the scope of rights of the present disclosure should not be limited to the described embodiments, but should be determined by the claims and equivalents thereof as well as the claims described later.

1: Construction road
2: cement
3: Broken road
4: Pavement
10: Cement supply vehicle
20: Asphalt supply vehicle
210: Asphalt tank
220: Asphalt supply line
30: Water supply vehicle
310: water tank
320: Water supply line
40: Recycling vehicle
410: Formed asphalt supply department
411: Asphalt supply cover
412: Expansion mixer
4121: Asphalt provision department
4121a: first provision unit
4121b: second provision unit
4122: Expansion chamber
4122a: Chamber housing
4122b: Belt coupling groove
4122c: Stir vane
4123: Water provision unit
4123a: Water supply nozzle
4123-1a: First nozzle housing
4123-2a: Second nozzle housing
4123-3a: Inlet valve seat
4123-4a: Piston rod
4123-5a: Inlet valve member
4123-6a: Discharge valve member
4123-7a: Elastic member
4123-8a: Pressure adjustment member
4123-9a: Elevating and lowering member
4123-10a: Guide home
4123-11a: Elevation and descent guide
4123b: Water transfer line
4124: Compressed air provision unit
4124a: Air supply nozzle
4124b: Air transfer line
4125: Asphalt discharge unit
4125a: first outlet
4125b: second outlet
4125c: Oscillator
4125d: Fixing part
4125-1d: Part to be fastened
4125-2d: Retaining ring
4125-3d: Inclined Vane
4125e: Guide screw
4125-1e: Screw shaft
4125-2e: Stirring blade
4125-3e: Fastening member
4125f: High pressure injection unit
4126: Heating unit
4126a: First heat dissipation cover
4126b: Second heat dissipation cover
4126c: Heating coil
4127: Bearing
4128a: Rotation drive unit
4128b: Rotating gear
4128c: Rotating belt
420: Water supply unit
421: Water spray member
430: Shredding module
431: Shredding roller
432: cutting blade
440: module casing
441: Mixed space
450: Asphalt transport unit
451: Transfer space
50: Installation vehicle
510: Vehicle body
520: Hopper member
530: Installation member
540: Flattening member
550: Pressure flattening unit
551: pressure bar
552: Elevating and lowering shaft
553: First eccentric rotation axis
554: Second eccentric rotation axis
560: Laying screw
60: Flat roller vehicle

Claims (10)

In the pavement repair method of recycling waste asphalt concrete at room temperature at the construction site to reduce carbon emissions,
A cement spraying step of spraying cement on a construction road along a predetermined direction in which road repairs are performed;
A crushing step of crushing at least a portion of the road surface of the construction road to obtain waste asphalt concrete;
An asphalt supply step of supplying asphalt to the waste asphalt obtained in the crushing step;
A water supply step of supplying water to the waste asphalt concrete obtained in the crushing step;
A recycling step of mixing the waste asphalt concrete, water and asphalt to obtain recycled asphalt concrete; and
Installation step of laying the recycled asphalt concrete on the crushed road surface
Including,
The shredding step and the recycling step are performed in a recycling vehicle driving on a construction road.
In claim 1,
The asphalt in the asphalt supply step is supplied by an asphalt supply vehicle equipped with an asphalt tank,
The water in the water supply step is supplied by a water supply vehicle equipped with a water tank,
In the predetermined direction, the asphalt supply vehicle and the water supply vehicle are positioned in front of the recycling vehicle.
In claim 2,
In the cement spraying step, cement is spread by a cement supply vehicle equipped with a cement tank,
A pavement repair method wherein the cement supply vehicle, the asphalt supply vehicle, the water supply vehicle, and the recycling vehicle sequentially drive the construction road along the predetermined direction.
In claim 3,
The asphalt supplied in the asphalt supply step is supplied in the form of foamed asphalt,
The foamed asphalt is a pavement repair method that is formed by mixing and expanding asphalt, water, and compressed air.
In claim 4,
The foamed asphalt is formed in an expansion mixer,
The expansion mixer,
An asphalt providing unit that receives asphalt from the asphalt tank;
An expansion chamber whose one side is connected to an end of the asphalt providing part and is formed as a hollow area;
a water supply unit supplying water above a predetermined pressure into the expansion chamber;
a compressed air supply unit that supplies compressed air of a predetermined pressure or higher into the expansion chamber; and
An asphalt discharge unit connected to the other side of the expansion chamber and discharging the foamed asphalt formed in the expansion chamber.
Including,
At least a portion of the asphalt providing portion is formed in a hollow cylindrical shape so that an asphalt flow path is formed therein,
The asphalt providing unit is provided with a heating unit for heating at least a portion of the inner and outer surfaces of the asphalt providing unit,
The water provider,
a water supply nozzle installed in the expansion chamber to supply water above a predetermined pressure into the expansion chamber; and
A water transfer line coupled to the rear end of the water supply nozzle and transporting water to the water supply nozzle.
Including,
At least a portion of the water transfer line is wound in a spiral shape along the outer peripheral surface of the cylindrical asphalt providing part,
The water supplied by the water provider is heated while flowing along the outer peripheral surface of the cylindrical asphalt provider.
In claim 5,
The recycling vehicle,
A crushing module that crushes at least a portion of the road surface of the construction road;
The expansion mixer disposed on top of the crushing module to supply the foamed asphalt to the waste asphalt obtained by the crushing module;
A water supply unit disposed at the top of the crushing module to supply water to the waste asphalt concrete obtained by the crushing module;
A module casing provided to surround the crushing module and forming a mixing space in which the crushing module is placed; and
An asphalt transport unit connected to one side of the module casing and provided with a transport space for transporting the recycled asphalt concrete.
Including,
The crushing module is,
A cylindrical crushing roller having a central axis of rotation disposed parallel to the ground, wherein the central axis of rotation is perpendicular to the predetermined direction; and
A plurality of cutting blades provided on the outer peripheral surface of the crushing roller and rotating to crush at least a portion of the road surface of the construction road.
Including,
A pavement repair method in which the waste asphalt concrete, the foamed asphalt, and the water are mixed in the mixing space to form the recycled asphalt concrete.
In claim 6,
The above pavement repair method is,
A primary compaction step of flattening the reclaimed asphalt concrete laid in the laying step; and
A secondary compaction step of additionally flattening the reclaimed asphalt flattened in the first compaction step.
It further includes,
The first compaction step and the paving step are performed in a paving vehicle traveling on the construction road behind the recycling vehicle,
The secondary compaction step is performed by a leveling roller vehicle traveling on the construction road behind the installation vehicle.
In claim 7,
The above pavement repair method is,
An on-site mixing ratio determination step of determining the mixing ratio of the waste asphalt obtained in the crushing step, the foamed asphalt supplied in the asphalt supply step, and the water supplied in the water supply step.
It further includes,
The field mixing ratio determination step is,
A sampling step of cutting a portion of the road surface of a construction road and collecting a plurality of test samples;
A sample recycling step of supplying foamed asphalt and water at different mixing ratios to each of the plurality of test samples to obtain a plurality of recycled asphalt samples;
A test step of performing a plurality of physical property tests on each of the plurality of recycled asphalt samples obtained in the sample recycling step; and
A mixing ratio determination step of determining the mixing ratio of the waste asphalt concrete, foamed asphalt, and water based on the results of a plurality of physical property tests performed on the plurality of recycled asphalt samples in the test step.
A pavement repair method comprising:
In the pavement repair method,
A cement spraying step of spraying cement on a construction road where road repairs are performed;
A crushing step of crushing at least a portion of the road surface of the construction road to obtain waste asphalt concrete;
An asphalt supply step of supplying asphalt to the waste asphalt obtained in the crushing step;
A water supply step of supplying water to the waste asphalt concrete obtained in the crushing step;
A recycling step of mixing the waste asphalt concrete, water and asphalt to obtain recycled asphalt concrete; and
Installation step of laying the recycled asphalt concrete on the crushed road surface
Including,
The crushing step and the recycling step are performed in a recycling vehicle traveling on a construction road,
The cement spreading step, the crushing step, and the recycling step are performed continuously along a predetermined direction on the construction road.
In the pavement repair method,
A cement spraying step of spraying cement on a construction road along a predetermined direction in which road repairs are performed;
A crushing step of obtaining waste asphalt concrete by crushing at least a portion of the road surface of the construction road to a predetermined depth along a predetermined direction on the construction road;
An asphalt supply step of supplying asphalt to the waste asphalt obtained in the crushing step;
A water supply step of supplying water to the waste asphalt concrete obtained in the crushing step;
A recycling step of mixing the waste asphalt concrete, water and asphalt to obtain recycled asphalt concrete; and
Installation step of laying the recycled asphalt concrete on the crushed road surface
Including,
The crushing step and the recycling step are performed in a recycling vehicle traveling on a construction road,
The cement spraying step, the crushing step, and the recycling step are performed sequentially on a construction road.

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