JP2012052335A - Emulsion spraying device and spreading machine equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve adhesiveness between an emulsion (tack coat) and a surface layer.SOLUTION: An emulsion spraying device 10 includes: an emulsion spraying section 11 which sprays emulsion on a construction surface before spreading of an asphalt mixture; a decomposer supply section 12 which supplies a decomposer to the emulsion sprayed by the emulsion spraying section 11; and a moisture removing portion 13 which removes moisture produced after the decomposer is supplied by the decomposer supply section 12. In a spreading machine 1 having a spreading device 1c provided in the rear of a vehicle 1a, the emulsion spraying device 10 is provided ahead of the spreading device 1c.

Description

  Techniques relating to asphalt mixture paving, in particular, the base layer and surface layer paving on the roadbed in asphalt paving are disclosed below.

  For example, when an asphalt mixture is laid as a surface layer on a previously paved asphalt mixture base layer or an existing road surface, it is called a tack coat in order to improve the adhesion between the surface layer and its lower layer (base layer or road surface). Treatment is applied to the lower surface. As disclosed in Patent Document 1, the tack coat is applied by spraying an emulsion on the surface of the lower layer, which is the application surface.

  The emulsion used for the tack coat is a liquid suitable for spraying work in which asphalt (50% to 70%), water, an emulsifier and the like are appropriately mixed. Patent Document 1 discloses that an emulsion tank and an emulsion spraying device are attached to a leveling machine such as an asphalt finisher, and the emulsion is sprayed on the lower layer surface before the asphalt mixture is leveled.

  In order for an emulsion dispersed as a tack coat to function well as an adhesive layer, it is known that the moisture contained in the emulsion needs to be expelled from the emulsion as much as possible after the application. As an example, in Patent Document 2, in the emulsion spraying device installed in the spreader machine, the decomposition agent is supplied immediately after the emulsion spraying, thereby promoting the decomposition of the sprayed emulsion and separating the water. Is disclosed. Since the viscosity of the emulsion is increased by separating water from the dispersed emulsion, even if the surface layer is composed of a porous asphalt mixture, a tuck coat layer is formed satisfactorily.

Japanese Patent Laid-Open No. 04-203006 Japanese Patent Laid-Open No. 2006-070463

  The technique of spreading the surface layer asphalt mixture immediately after spraying the emulsion on the lower layer surface is suitable when using an open-graded asphalt mixture as a surface layer material, but when using a dense particle size asphalt mixture as a surface layer material. Is not suitable. The reason is that the adhesion of the emulsion is reduced in the case of a dense particle size asphalt mixture.

  If the porous asphalt mixture is spread on the emulsion, moisture separated from the emulsion by the decomposing agent (water that has separated and exuded on the emulsion) will escape through the gaps in the mixture layer. There is no problem in adhesion to the surface layer. However, in the case of a dense-graded asphalt mixture spread on the emulsion, since the porosity of the mixture layer is small, there is no gap through which the moisture escapes, and the moisture remains confined below the surface layer. As a result, due to moisture remaining under the surface layer, the adhesion between the surface layer and the lower layer becomes non-uniform, or the adhesive force is insufficient and the adhesiveness is lowered. In other words, when a dense particle size asphalt mixture is used as the surface layer material, the adhesiveness between the emulsion sprayed on the lower layer surface and the surface layer is lowered, so some contrivance is necessary.

  In view of such a background, the present invention proposes an emulsion spraying apparatus which can apply an emulsion without any trouble even if the surface layer material is a dense particle size asphalt mixture.

  In order to solve the above-mentioned problems, an emulsion spraying apparatus proposed includes an emulsion spraying part for spraying an emulsion on a construction surface before spreading an asphalt mixture, and a water removing means for removing water from the emulsion sprayed by the emulsion spraying part. And comprising.

  Such an emulsion spraying device can be provided in front of the leveling device in a leveling machine having a leveling device for leveling the asphalt mixture at the rear of the vehicle.

  According to the emulsion spraying device according to the above proposal, the water removing means removes the water separated from the emulsion before spreading the asphalt mixture, so even if the dense particle size asphalt mixture is spread on the upper layer, The trapped moisture is suppressed. Accordingly, a decrease in the adhesion between the emulsion and the asphalt mixture on the emulsion is prevented, and an emulsion to be spread using the emulsion spreader spreads a dense asphalt mixture and a porous asphalt mixture on the emulsion. Fits both cases.

The figure which showed embodiment of the leveling machine provided with the emulsion spraying apparatus. The figure which showed 1st Embodiment of the water | moisture-content removal part in an emulsion spraying apparatus. The figure which showed the press of the moisture removal part shown in FIG. The figure which showed the water absorber of the water | moisture-content removal part shown in FIG. The figure which showed 2nd Embodiment of the water | moisture-content removal part in an emulsion spraying apparatus. The figure which showed 3rd Embodiment of the water | moisture-content removal part in an emulsion spraying apparatus. The figure which showed 4th Embodiment of the water | moisture-content removal part in an emulsion spraying apparatus.

  FIG. 1 shows an asphalt finisher as an embodiment of a leveling machine equipped with an emulsion spraying device. The illustrated embodiment shows a construction state in which a dense-graded asphalt mixture is spread as a surface layer on the base layer of the asphalt mixture previously paved on the roadbed.

  The leveling machine 1 includes a hopper 1b at the front of the vehicle 1a and a leveling device 1c at the rear. The asphalt mixture is supplied to the hopper 1b from the dump truck 2, and the asphalt mixture that has entered the hopper 1b is conveyed to the rear laying apparatus 1c by a conveying device such as a bar feeder. The spreader 1c is an existing device having a configuration in which the asphalt mixture sent out from the transfer device is spread using a screw spreader, and the spread asphalt mixture is spread using a screed. The surface layer G of the asphalt mixture laid by the laying device 1 c is compacted by the subsequent load roller 3.

  In the leveling machine 1, an emulsion spraying device 10 is installed in front of the leveling device 1c, and the emulsion is sprayed on the construction surface before the asphalt mixture is leveled. The emulsion spraying device 10 is configured by installing an emulsion spraying unit 11 and a decomposing agent supply unit 12 and a water removing unit 13 as water removing means at the lower part of the vehicle 1a. Emulsion is sent from the tank 14 mounted on the upper part of the vehicle 1 a to the emulsion spraying unit 11, and the decomposing agent is sent from the tank 14 to the decomposing agent supply unit 12.

  The decomposing agent supply unit 12 is provided behind the emulsion spraying unit 11 and supplies the decomposing agent to the emulsion sprayed to the lower layer surface by the emulsion spraying unit 11. The emulsion spraying unit 11 and the decomposing agent supply unit 12 may use a well-known configuration including a spray bar as disclosed in, for example, the above patent document, and detailed description thereof is omitted.

  The water removal unit 13 is provided behind the decomposition agent supply unit 12 and removes water generated after the decomposition agent is supplied. A first embodiment of the moisture removing unit 13 is shown in FIGS. The moisture removing unit 13 of the first embodiment includes a pressing device 20 that contacts and presses the construction surface after supplying the decomposition agent, and a water absorber 21 that absorbs moisture after being pressed by the pressing device 20. . The presser 20 and the water absorber 21 are attached to the vehicle 1a via the frame 13a. The frame 13a is a metal plate attached to the vehicle 1a by bolting or the like. In addition, although the example provided with the presser 20 is shown in this embodiment, the presser 20 is an auxiliary | assistant presence of a water | moisture content removal, and it may not be provided.

  3 is a metal cylinder (hollow) roller made of, for example, SUS, and a shaft 20a protruding from an end wall is pivotally supported by the frame 13a and rotates. The axial length of the metal cylinder roller used as the presser 20 can be equivalent to the construction width. In this case, only one metal roller is used. In addition, a plurality of metal rollers whose axial length is shorter than the construction width can be arranged in series in the axial direction to correspond to the construction width. A large number of through-holes 20b are formed in the circumferential surface of the roller of the pressing device 20 to communicate the inside and the outside of the cylinder.

  The pressing device 20 presses the construction surface (emulsion spraying surface) after the emulsion is sprayed by its own weight or downward biasing by the biasing means 20c. When the presser 20 is pressed, the water separated by the action of the decomposing agent is pushed out from the construction surface, and the pushed out water has a large number of through-holes 20b on the peripheral surface of the presser 20 so that it is on the construction surface. Can exude. The roller 20 is optimally a roller shape, but is not limited to this, and other shapes such as a sled or ski shape may be used as long as the shape can obtain an action of extruding moisture by applying pressure. Is possible. Further, the presser 20 can be formed not only from metal but also from resin provided with dimples.

  A water absorber 21 shown in a side view in FIG. 4 absorbs moisture that appears on the surface by the pressing device 20, and in the illustrated example, a sponge roller 21a using a sponge as a water absorbing material is used. . The sponge roller 21a is formed by providing a sponge around the shaft cylinder 21b as a central axis. The shaft cylinder 21b is made of SUS, and both ends are open, and a large number of through holes 21c are formed on the cylinder peripheral surface to communicate the inside of the cylinder with the outside of the cylinder. The shaft cylinder 21b as the central shaft has both end portions protruding from the sponge, and the protruding end portions are rotatably supported by three support rollers 21d, respectively, so that the sponge roller 21a is pivotally supported and rotates. . The support roller 21d is mounted on the frame 13a and supports the both ends of the shaft cylinder 21b at three points. The axial length of the sponge roller 21a is preferably matched with the pressing device 20. The shaft tube 21b is not limited to metal but may be made of other materials such as resin.

  For example, a resin water receiving pipe 21e is inserted into the shaft cylinder 21b (FIG. 4B). The water receiving pipe 21e has an axial length longer than that of the shaft cylinder 21b, and both end portions protrude from the shaft cylinder 21b. At the protruding end portion, the water receiving pipe 21e is fixed to the frame 13a by the bracket 13b (FIG. 2) (rotation). do not do). In addition, drainage ports 21f project from both end walls of the water receiving pipe 21e, and for example, a hose or the like extending from a suction machine is connected to the drainage port 21f. Except for the projecting end fixed by the bracket 13b, the water receiving pipe 21e is opened by cutting out the upper half of the intermediate part 21g, and the part 21g is formed in a rain gutter shape. The intermediate portion 21g receives water that is squeezed from the sponge roller 21a and passes through the through hole 21c of the shaft tube 21b. The water received by the water receiving pipe 21e is sucked from the drain port 21f.

  A squeezing roller 21h made of metal or the like is provided on the sponge roller 21a. The squeezing roller 21h is provided so that shafts 21i protruding from both end wall surfaces thereof are pivotally supported by a swing arm 21j (FIG. 2), and can swing up and down according to the swing arm 21j. One end of the swing arm 21j is pivotally supported inside the frame 13a, and the other end pivotally supporting the squeezing roller 21h swings up and down. Thus, the swingable squeezing roller 21h applies pressure to the sponge roller 21a by its own weight or the urging force of the urging means 21k, and squeezes out moisture contained in the sponge.

  Since the moisture removing unit 13 having the above structure removes moisture that has appeared on the construction surface after supplying the decomposing agent, when the asphalt mixture is laid out by the laying device 1c after this, the laid asphalt mixture is used. Moisture trapped underneath is suppressed. Therefore, the adhesiveness between the emulsion and the asphalt mixture on the emulsion is prevented from being lowered, and even a fine-grained asphalt mixture can be spread by applying a tack coat with the emulsion in the same manner as the porous asphalt mixture.

  Further, by providing the emulsion spraying device 10 with the water removing unit 13, a curing time for waiting for the water to evaporate after the emulsion spraying and the supply of the decomposing agent becomes unnecessary. Therefore, the working time can be shortened. Since the curing time is not required, the emulsion spraying device 10 according to the present embodiment can be incorporated in the spreader machine 1 before the spreader 1c. It is possible to perform continuous construction by the single leveling machine 1 until the construction of the mixture.

  A second embodiment of the moisture removing unit 13 is shown in FIG. The moisture removing unit 13 according to the second embodiment includes a pressing device 20 that contacts and presses the construction surface after supplying the decomposition agent, and a blower 22 that blows away moisture after being pressed by the pressing device 20. Of these, the pressing device 20 has the same structure as the pressing device 20 of the first embodiment.

  The blower 22 is a square blowout duct having an end face fixed by a bolt 22a inside the frame 13a and having a cross-sectional shape of a downward “U” shape, and has a length corresponding to the construction width. Or it can also be set as the structure which arranges the two air blowers 22 shorter than a construction width back and forth, and follows the expansion / contraction of the screed of the leveling apparatus 1c. For example, compressed air is supplied to the blower 22 from an air compressor Air mounted on the flooring machine 1, and this compressed air is blown from the blower 22 onto the construction surface after the decomposing agent is supplied. By blowing air, moisture that appears on the surface is blown off and removed. In addition to simply blowing air, a heater may be provided in the blower 22 to heat the air and blow the heated air. In this case, the blower 22 also functions as a heater (emulsion heating unit).

  A third embodiment of the moisture removing unit 13 is shown in FIG. The moisture removing unit 13 of the third embodiment includes a pressing device 20 that contacts and presses the construction surface after supplying the decomposition agent, and an aspirator 23 that sucks moisture after being pressed by the pressing device 20. . The pressing device 20 of the third embodiment has the same structure as the pressing device 20 of the first embodiment.

  The suction device 23 is a square suction duct having an end face fixed with bolts 23a inside the frame 13a and having a cross-sectional shape of a downward “U” shape, and has a length corresponding to the construction width. Or it can also be set as the structure which arranges two suction devices 23 shorter than a construction width back and forth, and is driven by expansion and contraction of the screed of the spreader 1c. The aspirator 23 is connected to, for example, a cyclone air / water separator Vac mounted on the spreader 1 and sucks and removes moisture that appears on the surface. The water sucked into the steam separator Vac is collected in the tank. On the rear side wall of the suction unit 23, a blade 23b using an elastic body such as rubber is attached to hang down in order to collect moisture on the construction surface.

  A fourth embodiment of the moisture removing unit 13 is shown in FIG. The water removal unit 13 of the fourth embodiment is configured as an emulsion heating unit, and a presser 20 that contacts and presses the construction surface after supplying the decomposition agent, and heating that heats the construction surface after being pressed by the presser 20. And a container 24. The pressing device 20 of the fourth embodiment has the same structure as the pressing device 20 of the first embodiment.

  The heater 24 is a heating device that uses electricity or gas as an energy source and has an end surface fixed by a bolt 24a inside the frame 13a and has a length corresponding to the construction width. Also in the case of this heater 24, it can be set as the structure which arranges the two heaters 24 shorter than a construction width back and forth, and follows the expansion / contraction of the screed of the spreader 1c. The heater 24 is connected to, for example, a controller Cnt mounted on the leveling machine 1 to perform power supply or fuel supply and other controls. The heating by the heater 24 promotes and removes the evaporation of moisture that appears on the construction surface.

  Specific examples of the heater 24 include an electric heater, a far infrared heater, an IH heater, a microwave heating device, and a gas burner. In the case of the electric type, control is relatively easy, and in the case of the fuel type, there is an advantage that the heating power is strong.

DESCRIPTION OF SYMBOLS 1 Spreading machine 1a Vehicle 1b Hopper 1c Spreading apparatus 10 Emulsion spreading apparatus 11 Emulsion spreading part 12 Decomposing agent supply part 13 Moisture removal part 20 Presser 21 Water absorber 22 Blower 23 Aspirator 24 Heater

Claims (10)

An emulsion spraying section for spraying the emulsion on the construction surface before spreading the asphalt mixture;
Water removal means for removing water from the emulsion sprayed by the emulsion spraying section;
An emulsion spraying device comprising The moisture removing means includes
2. The emulsion spraying apparatus according to claim 1, further comprising an emulsion heating unit for heating the emulsion sprayed by the emulsion spraying unit. The emulsion heating section
The emulsion spraying device according to claim 2, comprising a heating device using electricity or gas as an energy source. The moisture removing means includes
A decomposing agent supply unit for supplying a decomposing agent to the emulsion sprayed by the emulsion spraying unit;
A moisture removing unit for removing moisture generated after the decomposing agent is supplied by the decomposing agent supplying unit;
The emulsion spraying device according to claim 1, comprising: The moisture removing unit is
The emulsion spraying apparatus of Claim 4 comprised including the water absorber which absorbs the said water | moisture content. The moisture removing unit is
The emulsion spraying apparatus of Claim 4 comprised including the air blower which blows off the said water | moisture content. The moisture removing unit is
The emulsion spraying device according to claim 4, comprising an aspirator for sucking the water. The moisture removing unit is
The emulsion spraying apparatus according to claim 4, comprising a heater for heating the moisture. The moisture removing unit is
The emulsion spraying device according to any one of claims 5 to 8, further comprising a pressing device that contacts and presses the construction surface after supplying the decomposing agent. A leveling machine equipped with a leveling device for leveling the asphalt mixture at the rear of the vehicle,
A leveling machine comprising the emulsion spraying device according to claim 1 in front of the leveling device.

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