JP2013087434A - Repair method of existing pavement body - Google Patents

Repair method of existing pavement body Download PDF

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JP2013087434A
JP2013087434A JP2011226351A JP2011226351A JP2013087434A JP 2013087434 A JP2013087434 A JP 2013087434A JP 2011226351 A JP2011226351 A JP 2011226351A JP 2011226351 A JP2011226351 A JP 2011226351A JP 2013087434 A JP2013087434 A JP 2013087434A
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asphalt
existing pavement
scraping
heating
asphalt mixture
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JP2011226351A
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JP5615787B2 (en
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Ikumasa Sato
育正 佐藤
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Taisei Rotec Corp
大成ロテック株式会社
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Abstract

An object of the present invention is to provide a method for repairing an existing pavement that can reduce the number of work steps.
A method for repairing an existing pavement that forms a drainable pavement on an existing pavement R, a heating step for heating the existing pavement R, and a heating on the existing pavement R, A laying step of laying an asphalt mixture C made of a porous asphalt mixture, and in the laying step, the asphalt Cb in the asphalt mixture C hangs down by the heat of the heated existing pavement R and impervious to the lower layer of the asphalt mixture C The layer S is formed, and the drainage functional layer T is formed on the impermeable layer S.
[Selection] Figure 2

Description

  The present invention relates to a method for repairing an existing pavement.

  As shown in Patent Document 1, a road drainage pavement is composed of a roadbed, an impermeable layer that does not allow water to pass through, and a drainage functional layer that allows water to pass through. The impermeable layer is formed, for example, by forming a dense grained asphalt pavement or cement-based pavement and then spraying an asphalt emulsion on the upper surface thereof. By spreading the asphalt emulsion, the water shielding performance can be improved and the adhesion between the roadbed and the drainage functional layer can be improved. The drainage functional layer is formed of a porous asphalt mixture having a porosity set to 20% or more.

  Here, when repairing an existing pavement, a drainage pavement may be constructed on the existing pavement. In such a case, a cutting process of cutting the surface layer of the existing pavement with a predetermined thickness, a spraying process of spraying asphalt emulsion on the cut road surface to form an impermeable layer, and an impermeable layer A laying process of laying a new porous asphalt mixture with an asphalt finisher or the like. For example, this asphalt finisher is equipped with an asphalt emulsion spraying device, and the spraying step and the laying step can be performed in one unit.

JP 2005-146539 A

  However, the conventional method for repairing existing pavements has a problem that the number of work steps is large. In addition, the machine equipped with the asphalt emulsion spraying device is expensive, and there is a problem that the maintenance is complicated because the asphalt emulsion is easily cured.

  The present invention has been developed from such a viewpoint, and an object of the present invention is to provide a method for repairing an existing pavement that can reduce the number of work steps.

  In order to solve such a problem, the present invention is a method for repairing an existing pavement that forms a drainable pavement on an existing pavement, and a heating step that heats the existing pavement, A laying step of laying an asphalt mixture on the existing pavement, and in the laying step, the asphalt in the asphalt mixture drips due to the heat of the heated existing pavement, and is not formed below the asphalt mixture. A water permeable layer is formed, and a drainage functional layer is formed on the impermeable layer.

  According to this method, the impermeable layer can be formed only by laying the asphalt mixture in the laying step, so that the spraying step that has been conventionally performed can be omitted, and the number of work steps can be reduced.

  Moreover, it is preferable that the asphalt amount of the said asphalt mixture is contained more than the optimal asphalt amount of the said waste-water functional layer calculated | required by the adhesion test of the asphalt mixture. The asphalt amount is preferably set to a value obtained by adding 0.1 to 1.0% to the optimum asphalt amount (%).

  According to such a method, the asphalt in the asphalt mixture is likely to sag, and the impermeable layer can be more reliably formed.

  Moreover, it is preferable to include a scraping step of scraping the heated surface layer of the existing pavement between the heating step and the laying step.

  According to this method, the adhesiveness between the existing pavement and the new asphalt mixture can be improved.

  Further, a vehicle main body for traveling on the existing pavement, a heating device for heating a surface layer of the existing pavement, a scraping device for scraping the heated surface layer of the existing pavement, and an asphalt mixture It is preferable to use a road heater vehicle provided with a conveying device that conveys the vehicle body to the rear side, and to perform the heating step and the scraping step with the road heater vehicle.

  According to such a method, the heating process and the scraping process can be performed with one road heater vehicle, so that the work efficiency can be improved.

  According to the method for repairing an existing pavement of the present invention, the number of work steps can be reduced.

It is a schematic cross section which shows the repair method of the existing pavement which concerns on 1st embodiment of this invention. It is a schematic cross section which shows the newly established pavement which concerns on 1st embodiment of this invention. It is a figure which shows the repair method of the existing pavement which concerns on 2nd embodiment of this invention, Comprising: (a) shows a heating process and a scraping process, (b) shows a laying process. It is a schematic cross section which shows the newly established pavement which concerns on 2nd embodiment of this invention. It is a side view which shows the road heater vehicle which concerns on the modification of this invention. It is a top view which shows the road heater vehicle which concerns on a modification. It is a partial expanded side view which shows the scraping apparatus of the road heater vehicle shown in FIG. FIG. 7 is a partially enlarged plan view showing the scraping device for the road heater car shown in FIG. 6. It is a figure which shows the scraping member which comprises a scraping apparatus, (a) is a side view, (b) is a top view. It is a side view which shows an example which incorporated the road heater vehicle which concerns on a modification in construction organization.

[First embodiment]
Embodiments of the present invention will be described in detail with reference to the drawings. The repair method of the existing pavement which concerns on 1st embodiment performs a heating process and a laying process. In the repair method of the existing pavement according to the present embodiment, construction is performed so that the newly established pavement becomes a drainage pavement.

  In the heating step, the road surface Rs of the existing pavement R is heated by the heating device 2 as shown in FIG. On the surface layer of the existing pavement R, a heating layer Ra whose temperature has been increased by heating is formed with a predetermined thickness. The heating temperature is preferably set to 100 to 150 ° C. If the temperature is lower than 100 ° C., the existing pavement R is not sufficiently heated, and therefore it is difficult to promote the downward movement of the asphalt during the laying process described later. On the other hand, if the temperature exceeds 150 ° C., the asphalt of the existing pavement R may be modified to adversely affect the existing pavement R.

  In the laying step, as shown in FIG. 1, a new asphalt mixture C is laid on the heating layer Ra. The apparatus to be laid is not particularly limited, but in this embodiment, an asphalt finisher A including a hopper Ah and a screed Ak is used. In the hopper Ah, an asphalt mixture C previously blended in a plant or the like is stored. The screed Ak is an apparatus for spreading and leveling the asphalt mixture C supplied from the hopper Ah with a predetermined thickness.

  FIG. 2 is a schematic cross-sectional view showing the newly-laid pavement according to the first embodiment of the present invention. FIG. 2 shows the new pavement U1 immediately after performing the laying process. Asphalt mixture C is a porous asphalt mixture as shown in FIG. 2, and is composed of aggregate Ca, asphalt Cb, and additives. As the aggregate Ca, for example, a mixture of No. 6 crushed stone, fine sand and stone powder is used. The blending ratio of the aggregate Ca is appropriately set depending on traffic conditions and the like, but in this embodiment, for example, it is set to No. 6 crushed stone 85.5%, fine sand 9.5% and stone powder 5.0%.

Asphalt Cb is appropriately selected from straight asphalt, polymer-modified asphalt II type, or polymer-modified asphalt H type. The blending amount of asphalt Cb is appropriately set depending on traffic conditions and the like. In this embodiment, for example, the amount of asphalt is 4.8%, the density is 1.977 g / cm 3 , the porosity is 20.8%, and stable. The degree is 7.08 kN, the asphalt temperature during production is 170 ° C., the heating temperature of the aggregate during production is 195 ° C., and the temperature of the asphalt mixture during production is 170 ° C.

  The amount of asphalt described above is expressed as a mass percentage with respect to the total amount of asphalt mixture C. Here, the optimum amount of asphalt is determined by an adhesion test of the asphalt mixture (commonly called “sag test”). The sagging test will be conducted according to the “Pavement Test Method Handbook” (published by the Japan Road Association).

Specifically, in the sagging test, the asphalt amount of the asphalt mixture is set to about 5 points in 0.5% increments in the range of 4.0 to 6.0%, and the asphalt sagging amount for each specimen of the asphalt mixture is set. Ask. The amount of sagging is determined by the asphalt mass lost due to sagging or adhesion after the asphalt mixture laid at a predetermined thickness in the curing device is heated and cured in a drying furnace at a constant temperature for a required time. A curing device generally uses a bat. Specifically, the sagging amount is obtained by the following equation (1).
Sagging amount (%) = (mass of asphalt attached to the bat (g)) / (test specimen mass (g) before test) × 100 (1)

  In the sagging test, the inflection point in the relationship curve between the sagging amount of asphalt and the asphalt amount is set as the maximum asphalt amount. At the maximum asphalt amount, the asphalt mixture can be held statically at high temperatures. The obtained maximum asphalt amount is set as the “optimum asphalt amount” in the drainage functional layer.

  In the laying process, the surface layer of the existing pavement R is a heating layer Ra having a higher temperature than other portions of the existing pavement R. Therefore, the heat is transmitted to the asphalt Cb of the laid asphalt mixture C, and the asphalt Cb is likely to sag. That is, the downward movement of the asphalt Cb is promoted by the heat of the heating layer Ra. As a result, the suspended asphalt Cb accumulates in the lowermost layer of the asphalt mixture C, and the asphalt Cb is cured with the passage of time to form an impermeable layer S having a predetermined thickness. On the impermeable layer S, a drainage functional layer T having continuous voids is formed.

  The new pavement U1 formed in this way is composed of the existing pavement R, the impermeable layer S, and the drainage functional layer T from the lower layer side. Since the drainage functional layer T has continuous voids, it can pass water downward. Further, the impermeable layer S does not allow water to pass therethrough and guides water to a drainage groove (not shown).

  According to the repair method of the existing pavement according to the present embodiment described above, the asphalt Cb in the asphalt mixture C is dripped by the heat of the heated existing pavement R, and the impermeable layer S is formed in the lower layer of the asphalt mixture C. Is done. That is, since the impermeable layer S can be formed only by laying the asphalt mixture C in the laying step, the number of work steps can be reduced.

  Further, in the conventional repair method of the existing pavement, an impermeable layer was formed by spraying asphalt emulsion or the like in the spraying process, but in the present invention, this process becomes unnecessary, so that labor can be saved. Material costs can be reduced.

  In this embodiment, the amount of asphalt is set to “optimum asphalt amount”, but the amount of asphalt may be included more than the optimum amount of asphalt. Specifically, the asphalt Cb may be contained in an amount of 0.1 to 1.0% more than the optimum amount of asphalt. For example, when the optimum asphalt amount is calculated to be 4.8% by the droop test as in this embodiment, 0.1 to 1.0% is added to this value, and the actual asphalt amount is 4.9 to It may be set to 5.8%. If it does in this way, asphalt Cb will fall easily and impermeable layer S can be formed more certainly. If the value to be added is larger than 1.0%, the drainage functional layer T is easily bent or the porosity is not preferable.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The second embodiment is different from the first embodiment in that a scratching process is performed. In the repair method of the existing pavement according to the present embodiment, a heating process, a scraping process, and a laying process are performed. Since the heating process is the same as in the first embodiment, a detailed description thereof is omitted.

  In the scraping step, as shown in FIG. 3, a part or all of the heating layer Ra is scraped using the scraping device 3. The thickness to be scraped is set to 10 to 15 mm, for example. By the scraping process, a scraping layer Rb in which the existing pavement R is crushed into fine particles is formed on the surface layer of the existing pavement R. The scraping device 3 may be any device as long as the surface layer of the existing pavement R can be cut. The existing pavement R may be scraped by human power.

  In the laying step, the asphalt mixture C is laid at a predetermined thickness on the scraping layer Rb in the same manner as in the first embodiment. Since the scraping layer Rb is a portion heated by the heating process, the heat is transmitted to the asphalt Cb of the laid asphalt mixture C, and the asphalt Cb tends to sag. That is, the downward movement of the asphalt Cb is promoted by the heat of the scraping layer Rb (heating layer Ra). In the present embodiment, since the scraping layer Rb is formed by the scratching step, the asphalt Cb that hangs down to the lowermost layer of the scraping layer Rb and the asphalt mixture C penetrates and cures over time. An impermeable layer S having a thickness of 5 mm is formed. On the impermeable layer S, a drainage functional layer T having continuous voids is formed.

  The new pavement U2 thus formed is composed of the existing pavement R, the impermeable layer S, and the drainage functional layer T from the lower layer side. The effect similar to 1st embodiment can be acquired also by the new pavement U2. Moreover, by performing the scraping and unraveling step, the existing pavement R and the new asphalt mixture C can be easily combined, and the adhesion between the existing pavement R, the new asphalt mixture and C can be improved.

[Modification]
Next, a modified example of the present invention will be described. In the method of repairing an existing pavement according to the present invention, the machine to be used is not limited, but in a modification, a case of using a road heater vehicle that can perform the heating step and the scraping step as described above is used. Illustrate. First, the road heater vehicle will be described in detail. The direction will be described based on the front and rear, the left and right (width direction), and the top and bottom of the road heater vehicle.

  FIG. 5 is a side view showing a road heater vehicle according to a modified example of the present invention, and FIG. 6 is a plan view showing the road heater vehicle according to the modified example. As shown in FIG. 5, the road heater vehicle V includes a road heater main body (vehicle main body) 1 for traveling on a road surface Rs of a road (existing pavement) R, a heating device 2, a scraping device 3, The apparatus is mainly provided with a transfer device 4.

  As shown in FIG. 5, the road heater body 1 includes two left and right front wheels 11, 11... And a pair of left and right rear wheels 12 and 12 for traveling on the road surface Rs of the existing pavement R, and the rear wheel 12. It mainly includes an engine (not shown) for driving, an operating device 13 such as a handle, and a driver's seat 14 for an operator to sit on.

  In this modification, the front wheel 11 is configured as a steering wheel, and the rear wheel 12 is configured as a drive wheel. As shown in FIGS. 5 and 6, the operating device 13 and the driver's seat 14 are disposed on the right front of the upper portion of the road heater body 1.

  The transport device 4 is a device for transporting the asphalt mixture C to the asphalt finisher A disposed at the rear (see FIG. 10). The conveying device 4 includes a hopper 41 that temporarily stores the asphalt mixture C received from the dump truck D, and a bar feeder 42 that conveys the asphalt mixture C stored in the hopper 41 to the asphalt finisher A. Yes.

  As shown in FIGS. 5 and 6, the hopper 41 has a substantially box shape with a central portion 41 a on the lower surface and an upper surface opened, and is disposed in a front portion of the load heater main body 1.

  As shown in FIG. 5, the bar feeder 42 is inclined upward as it goes from the front to the rear, and is disposed from the central portion 41 a on the lower surface of the hopper 41 to above the hopper Ah of the asphalt finisher A (see FIG. 10). Has been. That is, the front end side (one end side) of the bar feeder 42 is connected to the hopper 41, and the rear end side (the other end side) projects rearward from the rear portion 1 b of the load heater main body 1. The bar feeder 42 is configured to transport the asphalt mixture C stored in the hopper 41 rearward and drop (drop) it onto the hopper Ah of the asphalt finisher A from the rear end portion 42a.

  The heating device 2 is a device for heating the surface layer. As shown in FIG. 6, as shown in FIG. 6, a central heating device 21 (only a part is shown in FIG. 6), a pair of side heating devices 22 and 22, and a vaporizer 23 and a plurality of gas cylinders 24, 24...

  The center heating device 21 is a device for heating the center portion in the width direction of the surface layer on which the asphalt mixture C is spread, and is attached along the lower portion of the load heater main body 1 via a support member (not shown). Yes. The central heating device 21 is configured by arranging a plurality of gas infrared heaters H using gas as fuel in the width direction and the front-rear direction.

  As shown in FIGS. 5 and 6, the pair of side heating devices 22 and 22 are devices for heating the widthwise side portion of the surface layer on which the asphalt mixture C is spread, and support members 22 a and 22 a It is attached to the side parts 1a and 1a of the load heater main body 1. The side heating device 22 is configured by arranging a plurality of gas infrared heaters H using gas as fuel in the width direction and the front-rear direction.

  In addition, the center part heating device 21 and the side part heating device 22 of this modification are arrange | positioned between the front wheel 11 and the rear wheel 12, as shown in FIG.5 and FIG.6, and are radiated from the gas infrared heater H. The surface layer is heated by the emitted far infrared rays. In this modification, as shown in FIG. 6, the temperature of the far infrared ray radiated from the gas infrared heater H can be adjusted by the temperature adjusting device 25 disposed on the left front of the upper portion of the load heater main body 1. It is configured. And the heating temperature of a surface layer adjusts the far-infrared temperature setting of the temperature control apparatus 25, a construction speed, a gas pressure, etc. suitably, and is set to about 100-150 degreeC. In other words, in this modification, since the heat loss of the surface layer can be reduced by reducing the distance between the heating device 2 and the scraping device 3, the heating temperature is increased in consideration of the heat loss of the surface layer. The heating temperature of the surface layer can be set to an appropriate temperature that does not cause overheating. Therefore, deterioration of the surface layer of the existing pavement R due to overheating can be reduced.

  In addition, the change in the road width can be dealt with by removing the side heating device 22 or increasing / decreasing the number of columns in the width direction of the central heating device 21 and / or the side heating device 22, or The support member 22a is attached to the side portion 1a of the road heater body 1 so as to be pivotable up and down, and is folded so that the upper surface of the side heating device 22 faces the side portion 1a of the road heater body 1. It can respond by doing.

  The vaporizer 23 is a device that warms the gas cylinder 24 frozen by heat of vaporization with warm water. In addition, the vaporizer 23 of this modification is comprised from the water put in the gas cylinder accommodating part 26 to such an extent that the lower side of the gas cylinder 24 is immersed, and the heater which heats the said water from the lower side.

  The gas cylinders 24, 24... Are devices for storing high-pressure liquefied gas supplied to the central heating device 21 and the side heating device 22, and as shown in FIGS. 1 is accommodated in a gas cylinder accommodating portion 26 provided along both sides of the upper portion of 1. The gas cylinder 24 is connected to each gas infrared heater H through a gas supply pipe (not shown). The liquefied gas sent from the gas cylinder 24 is supplied to each gas infrared heater H.

  7 is a partially enlarged side view showing the scraping device for the road heater car shown in FIG. 5, and FIG. 8 is a partially enlarged plan view showing the scraping device for the road heater car shown in FIG.

  The scraping device 3 is a device for scraping the surface layer heated by the heating device 2, and as shown in FIG. 6, the traveling direction with respect to the central portion scraping device 31 and the central portion scraping device 31. It comprises a pair of side scraping devices 32, 32 which are arranged at a position rearward. As shown in FIG. 7, the scraping device 3 is disposed behind the rear wheel 12 and is provided using a dead space W inevitably formed below the rear end side of the bar feeder 42. Yes. The depth to be scraped is set to about 10 to 20 mm by appropriately adjusting the heating temperature of the surface layer, the construction speed, the weight of the scraping device 3 and the urging force of the elastic member 36 described later.

  The center part scraping device 31 is a device for scraping the center part in the width direction of the surface layer heated by the center part heating device 21, and as shown in FIG. 7 and FIG. 8, a support member extending in the width direction. 31a, a shaft member 31b extending in the width direction, a pair of side plates 31c, 31c to which both ends of the support member 31a and the shaft member 31b are fixed, and a pair of side plates 31c, 31c, It is comprised from the scraping member 33,33 ... arranged in parallel by the width direction.

  As shown in FIG. 7, the support member 31 a has a hollow quadrangular shape, supports the elastic member 36, and connects the scraping device 3 and the load heater main body 1. The support member 31a is attached to the frame body 7 attached to the main body frame of the load heater main body 1 through a hydraulic cylinder 5 that moves the scraping device 3 up and down and a guide member 6 that guides the vertical movement of the hydraulic cylinder 5. It is attached.

  The support member 31a is connected to the tip of the hydraulic cylinder 5 via an attachment member 31d attached to the front surface, and is connected to the tip of the guide member 6 via a connection member 31e attached to the top surface. . The hydraulic cylinder 5 and the guide member 6 are inserted into a holding member 7a attached to the rear surface of the frame body 7, and the base end of the hydraulic cylinder 5 is fixed to the rear surface of the frame body 7 via the mounting member 5a. Yes.

  In addition, when it is not during construction (for example, when it is transported to the construction site or when the scratching process is not performed as in the first embodiment), the hydraulic cylinder 5 is operated and the scraping device 3 is raised. By doing so, it is possible to avoid contact between the road surface Rs and the scraping device 3 and to prevent the scraping device 3 from being damaged.

  As shown in FIGS. 7 and 8, the shaft member 31b has a cylindrical shape and is connected to the support member 31a via a pair of side plates 31c and 31c.

  FIG. 9 is a view showing a scraping member constituting the scraping device, where (a) is a side view and (b) is a plan view. As shown in FIGS. 9A and 9B, the scraping member 33 includes an arm member 34, an insertion member 35, and an elastic member 36.

  As shown in FIG. 9A, the arm member 34 is a member for receiving the biasing force of the elastic member 36 and rotating obliquely downward and supporting the insertion member 35. In this modification, as shown in FIG. 8, the long arm members 34 and the short arm members 34 are alternately arranged along the width direction. As shown in FIG. 9, an insertion member 35 is attached to the tip of the arm member 34.

  The insertion member 35 is a member that is inserted into (inserted into) the surface layer by the urging force of the elastic member 36. Then, by running the road heater vehicle V while the insertion member 35 is inserted into the surface layer, the surface layer can be scraped by the insertion member 35.

  A bit is attached to the insertion member 35 of this modification. The bit is formed so as to reduce in diameter from the upper side to the lower side, and is formed so that the tip is sharp. With such a configuration, the insertion member 35 can be easily inserted into the surface layer.

  The arm member 34 is formed with a substantially arc-shaped cutout 34a. The arm member 34 is integrally fixed to the cylindrical portion 34b in a state where the cutout portion 34a is fitted into the outer peripheral surface of the cylindrical portion 34b. The cylindrical portion 34b is mounted (inserted) so as to be rotatable with respect to the shaft member 31b, and a protrusion 34c is provided on the outer peripheral surface thereof.

  A reinforcing portion 34 d for reinforcing the arm member 34 is interposed between the protrusion 34 c and the arm member 34. The reinforcing portion 34d is integrally fixed to the protrusion 34c and the arm member 34. A columnar engaged portion 34e is provided on the side opposite to the reinforcing portion 34d with the protrusion 34c interposed therebetween.

  The engaged portion 34e is a member that abuts (contacts) the other end portion 36b of the elastic member 36, extends in the width direction, and is integrally fixed to the protrusion 34c.

  The elastic member 36 is a member that urges the insertion member 35 toward the surface layer (obliquely downward and clockwise in FIG. 9) via the arm member 34 (in FIG. 9A). Virtual line reference). The elastic member 36 of this modification is configured by a conventionally known coil spring, and is fixed in a state where one end 36a is inserted through the support member 31a (see FIG. 7), and the other end 36b is engaged with the engaged portion 34e. It is in contact.

  Returning to FIG. 7 and FIG. 8, the side scraping device 32 is a device for scraping the width direction side portion of the surface layer heated by the side heating device 22, and has a hollow rectangular shape extending in the width direction. A support member 32a, a columnar shaft member 32b extending in the width direction, a pair of side plates 32c and 32c to which the support member 32a and the shaft member 32b are fixed, and the side plates 32c and 32c; It is comprised from the scraping member 33,33 ... arranged in parallel by the width direction.

  Note that the configuration of the side scraping device 32 is the same as that of the central scraping device 31, and therefore the description thereof is omitted. In the following description, the central scraping device 31 and the side scraping device 32 are omitted. The connection structure will be mainly described. In addition, since the side scraping devices 32 and 32 are symmetrical, in the following description, only the side scraping device 32 located on the left side in the traveling direction will be described, and the side scraping device on the right side in the traveling direction will be described. The description of the device 32 will be omitted.

  As shown in FIG. 8, one end portion of the support member 32a of the side scraping device 32 extends inward from the side plate 32c located on the inner side in the width direction, and the extended portion extends in the width direction. It is fixed to a pair of connection plates 37, 37 that are spaced apart. A connecting shaft member 38 having both end portions fixed to the side plate 31 c of the central part scraping device 31 is inserted into the connecting plate 37. In other words, the center-side scraping device 31 and the side-side scraping device 32 are connected to each other via the connecting plate 37 and the connecting shaft member 38.

  As shown by the phantom line in FIG. 7, the connecting plate 37 is connected to the connecting shaft member 38 so as to be vertically rotatable. A change in the road width can be dealt with by operating a hydraulic cylinder (not shown) that moves the side scraping device 32 to the left and right to change the position of the side scraping device 32.

  For the change in the road width, the side scraping device 32 is removed, or the lengths of the support member 31a and the shaft member 31b of the central scraping device 31 and / or the side scraping device 32 are adjusted. It is also possible to cope with this by increasing or decreasing the number of scraping members 33, or by rotating the connecting plate 37 upward to separate the side scraping devices 32, 32 from the existing pavement R. It can also respond.

  Next, with reference to FIG. 10, a method of repairing the surface layer of the existing pavement R using the road heater vehicle V according to the modification will be described. Here, the repair method of the existing pavement which concerns on 2nd embodiment which performs a scratching process is demonstrated. FIG. 10 is a side view showing an example in which the road heater vehicle according to the modification is incorporated in the construction organization.

  In this modification, a case will be described in which the construction of the dump truck D, the road heater vehicle V, the asphalt finisher A, the madakam roller M, and the tire roller N is performed in order from the front side in the traveling direction and the surface layer of the existing pavement R is repaired. The construction using the road heater vehicle V is not limited to this.

  First, the dump truck D, the road heater vehicle V, the asphalt finisher A, the madakam roller M, and the tire roller N are arranged in this order on the road surface Rs of the existing pavement R to be repaired. Subsequently, the road heater vehicle V is moved forward and traveled together with the dump truck D.

  And while driving the road heater vehicle V, the surface layer of the existing pavement R is heated by the heating device 2 (heating step), and the surface layer heated by the scraping device 3 is scraped (scratching step).

  The insertion member 35 of the scraping device 3 is inserted into the heated and softened surface layer by the biasing force of the elastic member 36. Then, by running the road heater vehicle V while the insertion member 35 is inserted into the surface layer, the surface layer is scraped by the insertion member 35.

  Further, the asphalt mixture C is introduced from the dump truck D to the hopper 41 while the road heater vehicle V is running (laying process). As the asphalt mixture C, a porous asphalt mixture that forms the drainage functional layer T (see FIG. 4) is used. The asphalt amount of the asphalt mixture C is set in advance equal to the “optimum asphalt amount” in the drainage functional layer T, or is set larger than the “optimum asphalt amount”.

  Subsequently, the asphalt mixture C introduced into the hopper 41 is conveyed rearward by the bar feeder 42 and introduced (dropped) into the hopper Ah of the asphalt finisher A from the rear end portion 42a.

  Then, the asphalt mixture C is put on the surface layer that has been loosened by the asphalt finisher A, and spread (equalized to a thickness of about 20 to 30 mm). Subsequently, the asphalt mixture C and the surface layer are rolled and compacted by the Madakam roller M and the tire roller N.

  Even when the road heater vehicle V is used, as shown in FIG. 4, a new pavement U <b> 2 similar to the second embodiment described above is formed. Since the scraping layer Rb is a portion heated by the heating device 2, the heat is transmitted to the asphalt Cb of the laid asphalt mixture C, and the asphalt Cb is likely to sag. That is, the downward movement of the asphalt Cb is promoted by the heat of the scraping layer Rb (heating layer Ra). In the present embodiment, the scraping device 3 forms the scraping layer Rb, so that the asphalt Cb that hangs down to the lowermost layer of the scraping layer Rb and the asphalt mixture C penetrates and has a predetermined thickness of impervious water. Layer S is formed.

  On the impermeable layer S, a drainage functional layer T having continuous voids is formed. The new pavement U2 formed in this way is composed of the existing pavement R, the impermeable layer S, and the drainage functional layer T formed of the asphalt mixture C from the lower layer side.

  The same effect as that of the second embodiment can be obtained by the road heater vehicle V according to this modification. Further, according to the road heater vehicle V, since the heating device 2 and the scraping device 3 are provided, the heating process and the scraping process can be performed by one machine. Thereby, for example, when the scratching process is performed as in the second embodiment, the repair work can be easily performed. When the scraping process is not performed as in the first embodiment described above, the hydraulic cylinder 5 may be operated to raise the scraping device 3 and retract the scraping device 3 from the road surface Rs. .

  Also, according to the road heater vehicle V, the asphalt finisher A used for ordinary pavement work smaller than the conventional remixer is used for the subsequent construction machine by mounting the scraping device 3 on the road heater vehicle V. It becomes possible. In addition, the conventional scraping device is configured to scrape the surface layer of the existing pavement R by rotating the rotor with the bit attached along the outer peripheral surface by the driving force of the motor. Since the apparatus 3 is configured to scrape the surface layer of the existing pavement R using the urging force (elastic force) of the elastic member 36, a motor for driving the scraping apparatus 3 is not required. The structure of the unwinding device 3 is simplified. Therefore, even if the scraping device 3 is mounted on the road heater vehicle V, the road heater vehicle V does not need to be enlarged.

  In particular, in the present modification, the scraping device 3 is disposed in a dead space W that is inevitably formed below the rear end side of the bar feeder 42, so that the total length of the road heater vehicle V is the same as that of the conventional load. It is substantially the same as the overall length of the heater wheel. That is, according to the present modification, when the road surface layer regeneration method is performed, it is not necessary to use a large construction machine (for example, a remixer or the like) by incorporating the road heater vehicle V of the present modification into the construction knitting. Therefore, the construction distance can be reduced and the construction cost such as the transportation cost can be reduced.

  In addition, the road heater vehicle V includes a heating device 2 for heating the surface layer of the existing pavement R, and a scraping device 3 for scraping the surface layer heated by the heating device 2. 2 and the scraping device 3 are close to each other, and after the heating operation, the scraping operation can be performed quickly. Therefore, before the surface layer is cooled by the outside air, it is possible to perform a scraping operation and reduce heat loss of the surface layer. Therefore, it is not necessary to set the heating temperature higher in consideration of the heat loss of the surface layer, so that it becomes possible to suppress overheating of the surface layer, and consequently deterioration of the surface layer of the existing pavement R due to overheating. Can be reduced.

  And in this modification, since the distance between the heating device 2 and the scraping device 3 is reduced and the surface layer is softened, the scraping operation can be performed, which is simpler than the rotary type scraping device. The spring-type scraping device 3 can be used. As a result, even if the scraping device 3 is mounted on the road heater vehicle V, the road heater vehicle V does not need to be enlarged.

  Furthermore, in this modified example, the asphalt finisher A does not perform construction while pushing the dump truck D directly, so the load on the asphalt finisher A is reduced and the construction speed of the asphalt finisher A can be stabilized. In addition, since the asphalt mixture C is conveyed rearward by the bar feeder 42 and is introduced into the hopper Ah of the asphalt finisher A from the rear end portion 42a, the material supply amount into the hopper Ah can be kept constant. The weight balance before and after the asphalt finisher A (center of gravity before and after) can be stabilized, and the amount of the asphalt mixture C (the amount of material squeezed out) can be stabilized on the scraped surface layer. Therefore, since the construction speed of the asphalt finisher A, the weight balance before and after the asphalt mixture C can be stabilized, the flatness of the leveling surface is improved.

  As mentioned above, although the suitable modification was demonstrated about this invention, this invention is not restricted to the said modification, A design change is possible suitably in the range which does not deviate from the meaning of this invention. For example, although the gas infrared heater H is used in this modification, the present invention is not limited to this. For example, the heating device 2 may be configured using another heating device such as a burner or a hot air fan.

  Further, in this modification, the scraping device 3 is composed of the central scraping device 31 and the pair of side scraping devices 32, 32. However, the present invention is not limited to this, and a single device is used. You may comprise so that the width direction center part and side part of a surface layer may be scraped. That is, the side scraping devices 32 and 32 may be omitted, and the center scraping device 31 may be extended to both sides in the width direction.

  In this modification, the arm member 34, the cylindrical portion 34b, the protrusion 34c, the reinforcing portion 34d, and the engaged portion 34e are provided between the insertion member 35 and the elastic member 36. Any configuration may be used as long as the force can be transmitted to the insertion member 35.

  In this modification, the arm members 34 having different lengths are alternately arranged along the width direction. However, the present invention is not limited to this, and the arm members 34 having the same length are arranged along the width direction. May be.

  Moreover, in this modification, although the reinforcement part 34d and the to-be-engaged part 34e were provided, it is not limited to this, You may abbreviate | omit the reinforcement part 34d and the to-be-engaged part 34e.

  Moreover, in this modification, although the insertion member 35 was comprised with the bit, it is not limited to this, What kind of composition may be sufficient if it has the rigidity which can be inserted in a surface layer.

  Further, in the present modification, the elastic member 36 is configured by a coil spring, but is not limited to this, and any configuration is possible as long as the insertion member 35 can be biased toward the surface layer. Good.

1 Road heater body (vehicle body)
DESCRIPTION OF SYMBOLS 2 Heating device 3 Scraping and unraveling device 4 Conveying device C Asphalt mixture Ca Aggregate Cb Asphalt R Existing pavement Ra Heating layer Rb Scraping layer Rs Road surface S Impervious layer T Drainage functional layer V Road heater vehicle

Claims (5)

  1. A method for repairing an existing pavement that forms a drainage pavement on an existing pavement,
    A heating step of heating the existing pavement;
    A laying step of laying an asphalt mixture on the heated existing pavement, and
    In the laying step, the asphalt in the asphalt mixture is dripped by the heat of the heated existing pavement to form an impermeable layer under the asphalt mixture, and a drainage functional layer is formed on the impermeable layer. A method for repairing an existing pavement characterized by that.
  2.   2. The method for repairing an existing pavement according to claim 1, wherein the amount of asphalt of the asphalt mixture is greater than the optimum amount of asphalt of the drainage functional layer determined by an asphalt mixture adhesion test.
  3.   The method for repairing an existing pavement according to claim 2, wherein the amount of asphalt is set to a value obtained by adding 0.1 to 1.0% to the optimum amount of asphalt (%).
  4.   The existing pavement according to any one of claims 1 to 3, further comprising a scraping step of scraping a heated surface layer of the existing pavement between the heating step and the laying step. Body repair method.
  5. A vehicle body for traveling on the existing pavement;
    A heating device for heating the surface layer of the existing pavement,
    A scraping device for scraping the surface layer of the heated existing pavement,
    Using a road heater vehicle equipped with a transport device that transports the asphalt mixture to the rear side of the vehicle body,
    The method for repairing an existing pavement according to claim 4, wherein the heating step and the scraping step are performed by the road heater vehicle.
JP2011226351A 2011-10-14 2011-10-14 Rehabilitation of existing pavement Active JP5615787B2 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS615103A (en) * 1984-06-19 1986-01-10 Fukuda Douro Kk Repairing of crack of asphalt foundation
JPH08295802A (en) * 1995-04-24 1996-11-12 Kajima Doro Kk Water draining paving material and its production
JP2000170111A (en) * 1998-12-02 2000-06-20 Daito Sangyo Kk Waterproof adhesion method of pavement and its structure
JP2001262509A (en) * 2000-03-16 2001-09-26 Nippon Hodo Co Ltd Method and device for reconstructing draining paved layer
JP2004204509A (en) * 2002-12-25 2004-07-22 Jfe Steel Kk Drainage asphalt mixture for use in drainage pavement
JP2010007353A (en) * 2008-06-26 2010-01-14 Himeji Ichi Asphalt pavement repairing method
JP2011179289A (en) * 2010-03-04 2011-09-15 Kajima Road Co Ltd Method and apparatus for repairing asphalt pavement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS615103A (en) * 1984-06-19 1986-01-10 Fukuda Douro Kk Repairing of crack of asphalt foundation
JPH08295802A (en) * 1995-04-24 1996-11-12 Kajima Doro Kk Water draining paving material and its production
JP2000170111A (en) * 1998-12-02 2000-06-20 Daito Sangyo Kk Waterproof adhesion method of pavement and its structure
JP2001262509A (en) * 2000-03-16 2001-09-26 Nippon Hodo Co Ltd Method and device for reconstructing draining paved layer
JP2004204509A (en) * 2002-12-25 2004-07-22 Jfe Steel Kk Drainage asphalt mixture for use in drainage pavement
JP2010007353A (en) * 2008-06-26 2010-01-14 Himeji Ichi Asphalt pavement repairing method
JP2011179289A (en) * 2010-03-04 2011-09-15 Kajima Road Co Ltd Method and apparatus for repairing asphalt pavement

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