JPWO2007007804A1 - Work vehicle for spreading pavement material and construction method of pavement using the same - Google Patents

Abstract

Even paving materials such as binder emulsions that are easy to disassemble and have poor mechanical stability, and emulsion mixtures containing fillers and fine aggregates can be safely and safely sprayed. Providing a pavement material spreading work vehicle capable of efficiently building a thin layer of a pavement, and a safe and efficient low-cost pavement construction method using such a pavement material spreading work vehicle A pipe that includes a material storage tank, a spray bar, a plurality of spray nozzles connected to the spray bar, and a piston pump, and connects the material storage tank and the suction port of the piston pump. And a pavement material spraying work vehicle having a pipe connecting the discharge port of the piston pump and the spray bar, and a method for constructing a pavement using such a pavement material spraying work vehicle. It is solved by.

Description

  The present invention relates to a working vehicle for spreading pavement material and a method for constructing a pavement using the same, and more particularly, pavement material such as a binder emulsion mixture containing filler and fine aggregate is spread on a road surface or floor slab. The present invention relates to a working vehicle for spreading pavement materials and a method for constructing a pavement using the same.

  Conventionally, as a device for spraying a paving material such as asphalt on a road surface, a spraying device including a gear pump has been used (see Japanese Patent Application Laid-Open No. 2004-131958). However, according to the experience of the present inventors, the mechanical stability of the modified asphalt emulsion, resin or rubber emulsion, and asphalt emulsion to which latex is added using the spraying device provided with the gear pump. If an attempt is made to spray a bad binder emulsion, the asphalt emulsion may be decomposed before being discharged from the spray nozzle, resulting in inconvenience that it cannot be sprayed well on the road surface. This is because, according to the knowledge of the present inventors, the conventional spraying device uses a gear pump as a discharge pump, and the asphalt emulsion comes into contact with the gear in the gear pump and receives a shearing force to cause friction. This is because decomposition of the asphalt emulsion occurs.

  Also, using a conventional spraying device, for example, when trying to spray an asphalt emulsion mixture in which filler and fine aggregate are mixed with asphalt emulsion, the mixed filler and fine aggregate are sandwiched between the gears in the gear pump, The pump may not work due to biting, or the gears may wear out, resulting in a problem that the function of the pump deteriorates early. It was very difficult to spread using.

  In order to solve such problems, as a device for spraying an asphalt emulsion mixture mixed with filler, fine aggregate, etc., the inside of the tank containing the asphalt emulsion mixture is pressurized by air pressure, and the asphalt emulsion mixture is pressurized by that pressure. A spraying device that discharges toward the spray nozzle has also been proposed (see Japanese Patent Publication No. 60-41163). However, in this pressurizing type spraying device, it takes time to pressurize the asphalt emulsion mixture in the tank until the inside of the tank reaches a sufficient pressure, and the filler and fine aggregate are mixed. Discharge of the asphalt emulsion mixture having an increased viscosity requires a large pressure, and the entire apparatus must be pressure resistant, and there is a drawback that there is a danger of pressurization. Further, in the pressure type spraying device, there is a problem that material separation between the asphalt emulsion and the aggregate tends to occur between the tank and the spraying nozzle, and spraying with a constant composition cannot be performed.

  For this reason, conventionally, an emulsion mixture in which fillers, fine aggregates, and the like are mixed is spread on a road surface in a mixture state using a machine called a spreader box (Japanese Patent Laid-Open No. 2000-27105). No. publication). However, this method of spreading the emulsion mixture has the disadvantages that it takes time and effort to spread the emulsion mixture to a predetermined thickness, the efficiency is low, and the construction area does not increase. In addition, there is a limit to reducing the layer thickness of the mixture depending on the leveling, and there is a problem that the construction thickness is inevitably thicker than necessary and the cost is increased.

  The present invention was made to solve the above-mentioned problems of the prior art, and paving such as a binder emulsion that is easy to decompose and poor in mechanical stability, and an emulsion mixture containing fillers and fine aggregates. Even paving materials can be safely and safely sprayed, and a paving material spraying work vehicle capable of efficiently building a thin layer of paving materials, and such paving materials An object of the present invention is to provide a safe and efficient method for constructing a low-cost pavement using a work vehicle for spraying.

  In order to solve the above-mentioned problems, the present inventors diligently conducted test and research, and as a result, by using a piston pump instead of a conventional gear pump, even a binder emulsion having poor mechanical stability has a problem. The emulsion mixture containing fillers and fine aggregates can be sprayed safely and efficiently without causing the material to bite into the pump operating mechanism and pump wear. And the present invention was completed.

  That is, the present invention comprises a material storage tank, a spray bar, a plurality of spray nozzles connected to the spray bar, and a piston pump, and a conduit connecting the material storage tank and the suction port of the piston pump; To provide a pavement material spreading work vehicle having a pipe connecting a discharge port of a piston pump and a spray bar, and a method for constructing a pavement using such a pavement material spreading work vehicle. Thus, the above-mentioned problem is solved.

  As described above, the working vehicle for pavement material spraying according to the present invention uses a piston pump as a discharge pump, so that there is little contact decomposition between the pavement material and pump components, and fillers and fine aggregates. Even pavement materials containing such as can obtain the advantage that they can be discharged and dispersed safely and reliably without being pressurized.

  In the working vehicle for pavement material spraying according to the present invention, it is preferable to provide a material return pipe for connecting the spray bar and the material storage tank, and such a return pipe should be provided. Thus, even when the spray nozzle is not sprayed, the piston pump can always be operated to circulate the paving material, and the material separation of the paving material can be prevented. In this material storage tank, it is preferable to provide a stirring and mixing blade for stirring and mixing the material. Thus, by providing the stirring and mixing blade in the material storage tank, the material is stirred. In addition to preventing separation of the paving material, if necessary, various paving materials can be introduced into the material storage tank and mixed in the material storage tank to produce a paving mixture. The advantage is obtained.

  Furthermore, in the working vehicle for pavement material spraying according to the present invention, the piston pump is a backward-acting pump, and the piston head has a bowl-like shape opened toward the suction port side. Preferably, this not only can reduce the pulsation of the discharge amount, but also because the piston head is bowl-shaped, there is no dead space between the piston head and the inner wall of the cylinder. There is an advantage that the paving material can be moved more smoothly by reciprocating motion. Further, when the piston head is provided with one or more piston rings having at least two pairs of annular grooves arranged so as to face each other with their backs facing each other, In any process, it is possible to prevent the paving material from entering between the cylinder and the piston. Even if the paving material contains filler, fine aggregate, etc., the bite of the material and the wear of the piston The excellent effect of being able to discharge and disperse without any problems is obtained.

  By using such a working vehicle for pavement material spraying of the present invention, a layer of a pavement material containing filler and / or fine aggregate on a road surface or floor slab is fixed by a simple method of spraying. Since the thickness is relatively thin, and it can be constructed efficiently and safely, it is suitable for construction in a large area, and particularly exhibits the power in constructing a surface treatment layer. Further, if the working vehicle for pavement material spraying of the present invention is used, a thin layer of the pavement material can be formed by a method called spraying. For example, an appropriate pavement material is sprayed on the drainage pavement. Even if a layer of pavement material is formed, the surface of the drainage pavement will not be filled and blocked, and the surface can be rejuvenated or repaired while maintaining drainage. Benefits are gained.

It is a side view which shows an example of the working vehicle for pavement material dispersion | distribution of this invention. It is a top view which shows an example of the working vehicle for pavement material dispersion | distribution of this invention. It is sectional drawing which shows an example of the piston pump used by this invention. It is a perspective view of a piston ring. It is a figure explaining operation | movement of a piston pump. It is a figure explaining operation | movement of a piston pump. It is a figure explaining operation | movement of a piston pump. It is a figure explaining operation | movement of a piston pump. It is a figure explaining operation | movement of a piston pump. It is a figure which shows an example of the piping system in the working vehicle for pavement material dispersion | spreading of this invention.

  Hereinafter, the working vehicle for spreading pavement materials according to the present invention will be described with reference to the drawings.

  FIGS. 1 and 2 are a side view and a plan view, respectively, showing an example of a working vehicle for spraying pavement material according to the present invention. 1 and 2, reference numeral 1 denotes a working vehicle for spreading paving material according to the present invention. In the illustrated example, a self-propelled work vehicle equipped with an engine is shown, but the pavement material spreading work vehicle 1 of the present invention is, for example, a non-self-propelled one that is towed and travels. Also good. Reference numeral 2 denotes a material storage tank for storing a paving material, and a stirring and mixing blade 3 is provided in the material storage tank 2. The stirring and mixing blade 3 is appropriately rotated by a motor 4 for driving the stirring and mixing blade to stir the pavement material stored in the material storage tank 2 and prevent material separation from occurring. Accordingly, various paving materials are mixed in the material storage tank 2 to produce a paving mixture. For example, a binder emulsion such as an asphalt emulsion, a filler, a fine aggregate, and the like are put into the material storage tank 2 and the stirring and mixing blade 3 is rotated to mix them. Mixtures can be produced. The produced binder emulsion mixture can be discharged and dispersed as it is by a piston pump, which will be described later, and the pavement material application work vehicle 1 of this example can perform both the production and application of the pavement mixture. It has the advantage of being able to. In addition, it cannot be overemphasized that the material storage tank 2 has an opening and closing opening (not shown) for supplying a pavement material therein. In a preferred embodiment of the present invention, the material storage tank 2 is provided with appropriate heating and heat retaining means, so that the paving material can be heated to or maintained at an appropriate temperature. Yes.

  Reference numerals 5a and 5b denote a pair of piston pumps, which supply the hydraulic pressure to the hydraulic cylinders 6a and 6b to drive the piston rods 7a and 7b, thereby sucking and discharging the material. The structure of the piston pumps 5a and 5b will be described in detail later. Reference numeral 8 denotes a hydraulic pressure generating motor for supplying hydraulic pressure to the hydraulic cylinders 6a and 6b. In the illustrated example, two piston pumps 5a and 5b are paired to reduce pulsation, and the phase of the reciprocation is set to be 180 degrees different. However, the number of piston pumps 5a and 5b is as follows. The number is not limited to two, and may be one or three or more. In the case of three units, it is preferable to set their reciprocating phases to be different from each other by 120 degrees.

  Reference numeral 9 denotes a spray bar, and a plurality of spray nozzles 10a, 10b,. Pavement material discharged from the pair of piston pumps 5a and 5b is supplied to the spray bar 9 via the discharge pipe 15 and the first three-way valve 27a. The spray bar 9 is suspended from a mount 11 that is attached to the pavement material spraying work vehicle 1 so as to be movable up and down, and the mount 11 is changed in its vertical position by lift hydraulic cylinders 12a and 12b. The distance between the spray nozzles 10a, 10b... And the road surface can be adjusted as appropriate. In the illustrated example, the number of spray bars 9 is one. However, by arranging two spray bars 9 in parallel and shifting the horizontal position in the vehicle width direction of the working vehicle 1 for pavement material dispersion, The spreading width of the paving material may be adjustable, the attachment of the spray bar 9 can be extended to increase the spreading width, or the pipes can be folded at both ends or one end. Of course, the spreading width of the spray bar 9 may be changed by extending or folding it. The spray nozzles 10a, 10b,... Are individually provided with opening / closing valves 13a, 13b, etc., and these opening / closing valves 13a, 13b,. Can be adjusted.

  9 'is a spray bar for single-handed manpower, and one end of the spray bar is connected to the first three-way valve 27a via a sufficiently long flexible pipe member. A spray nozzle is attached to the other end of the single-spraying spray bar 9 ', and the flow of the paving material is switched from the spray bar 9 to the single-spraying spray bar 9' by switching the three-way valve 27a. Thus, the pavement material spraying work vehicle 1 can appropriately apply the pavement material manually to a portion that does not work well, a portion that is left unspread, and the like.

  Reference numerals 14a and 14b denote accumulators, which are connected to the spray bar 9 by connection pipes 29 and 29, respectively, to suppress fluctuations in the pressure of the paving material in the spray bar 9. In the illustrated example, two accumulators 14a and 14b are provided, but the number of accumulators may be one or three or more. Although omitted in FIG. 1 for the sake of convenience, 16 shown in FIG. 2 is a return pipe for the paving material, one end of which is connected to the spray bar 9 via the on-off valve 17 and the other end is made of the material. It is connected to the storage tank 2.

  Reference numeral 18 denotes a cleaning liquid tank that stores a cleaning liquid for cleaning the spray bar 9, the spray nozzles 10a, 10b..., And the spray bar 9 ′ for single-rolling, and 19 is a compressor that supplies air pressure to the cleaning liquid tank. It is. The cleaning liquid sent by the air pressure from the compressor 19 is guided to the spray bar 9 through the cleaning liquid pipe 20 and the second three-way valve 27b and the on-off valve 21, and the spray bar 9 and the spray nozzles 10a, 10b,. .. Wash. Only high-pressure air from the compressor 19 can be directly supplied to the spray bar 9 via the pneumatic pipe 22, the second three-way valve 27b, and the on-off valve 21, and cleaning with a cleaning liquid and cleaning with only high-pressure air can be performed. Can be repeated in a predetermined pattern, or it can be performed by appropriately selecting only cleaning with either a cleaning liquid or air pressure as needed. Furthermore, the second three-way valve 27b can be switched to supply the cleaning liquid and / or high-pressure air to the spray nozzle cleaning conduit 28.

  Reference numeral 23 denotes an operation panel. By operating appropriate switches and the like, the stirring / mixing blade driving motor 4 is driven / stopped / changed in the rotational speed, the piston pumps 5a, 5b are driven / stopped, the discharge amount is adjusted, and spraying is performed. It is possible to operate and adjust the various operations described above such as adjustment of the vertical position of the bar 9 and adjustment of opening / closing and opening of the on-off valves 13a, 13b... Provided in the spray nozzles 10a, 10b. It can be done. Reference numeral 24 denotes a generator that supplies electric power necessary for the operation of the working vehicle 1 for pavement material spraying according to the present invention.

  FIG. 3 is a cross-sectional view showing the structure of the piston pumps 5a and 5b. In FIG. 3, reference numeral 51 denotes a cylinder, and a piston 52 is provided inside the cylinder 51 so as to be able to reciprocate. The piston 52 includes a piston head 53 and piston rods 7a and 7b. The cylinder 51 is partitioned by a piston head 53 into a first chamber A on the right side in the drawing and a second chamber B on the left side in the drawing.

  A suction port 54 connected to a material storage tank 2 (not shown) is provided at the right end of the first chamber A. The suction port 54 has a first ball valve 55a and a ball valve 55a on the suction port 54 side. There is provided a first check valve constituted by a spring 56 biasing toward the first valve seat 57a. 58 is a bottomed housing that supports the spring 56, and a plurality of communication ports 59, 59... Are provided at the bottom of the housing 58, and the ball valve 55a moves to the left. The pavement material is allowed to pass through when the pavement material flows from the suction port 54.

  Above the left end of the second chamber B, a discharge port 60 connected to a discharge pipe 15 (not shown) is provided. As shown in FIG. 3, since the piston rods 7a and 7b exist in the second chamber B, the cross-sectional area in the plane perpendicular to the piston moving direction of the second chamber B is in the piston moving direction of the first chamber A. It is smaller than the cross-sectional area in the vertical plane.

  On the other hand, the first chamber A side of the piston head 53 is formed in a bowl shape that opens toward the first chamber A, and the bottom portion of the bowl shape has a first chamber A and a second chamber B. A communication port 61 is provided for communicating the. The communication port 61 is provided with a second ball valve 55b, a spring that urges the ball valve 55b toward the communication port 61, and a second check valve configured by a second valve seat 57b. .

  62a and 62b are piston rings arranged on the second chamber B side of the piston head 53. As shown in FIG. 4, the piston rings 62a and 62b have an annular groove 63 having a U-shaped cross section at the periphery thereof. 63 is provided. As shown in FIG. 4, the piston rings 62 a and 62 b are disposed on the second chamber B side of the piston head 53 so that the annular grooves 63 and 63 are back to back. By arranging the two pairs of piston rings 62a and 62b in this way, it is possible to effectively prevent the paving material from entering between the piston 52 and the cylinder 51 in any of the reciprocating movements of the piston head 53. be able to. In addition, although it is preferable to provide at least two pairs of piston rings 62a and 62b and the bottoms of the grooves are back to back with each other, in some cases, only one may be arranged in the direction of the piston ring 62a. Two of them may be arranged in the direction of the piston ring 62a, and three or more of them may be arranged. In the illustrated example, the two piston rings 62a and 62b having the annular groove 63 only on one surface thereof are arranged so that the bottoms of the annular grooves 63 and 63 are back to back with each other. In some cases, one piston ring provided with annular grooves 63, 63 on both sides may be used.

  The material constituting the piston pumps 5a and 5b as described above is not particularly limited as long as it can withstand the suction and discharge of the paving material. In general, it is better to use metals such as stainless steel, steel, and aluminum, and these metals are chrome plated with a thickness of 0.02 mm or more, more preferably 0.1 mm or more. Is desirable. Further, it is preferable to use ceramic as the material of the ball valves 55a and 55b, and by using ceramic, it becomes possible to reduce wear caused by fillers and fine aggregates. As a material for the piston rings 62a and 62b, a flexible resin is preferably used, and among them, a urethane resin is preferably used.

  Next, suction and discharge operations of the piston pumps 5a and 5b will be described with reference to FIGS. First, as shown in FIG. 5, the piston head 53 is moved from the position almost at the right end of the cylinder 51 by moving the piston rods 7a and 7b in the direction of the arrow in the drawing by the operation of the hydraulic cylinder (not shown). Since the volume of the first chamber A increases and the inside of the first chamber A becomes negative pressure, the first ball valve 55a moves to the left in the figure against the biasing force of the spring 56 (not shown). The first check valve is opened. When the first check valve is opened, the pavement material is sucked into the first chamber A as shown by an arrow in the drawing and flows in. At this time, since the second ball valve 55b is biased toward the second valve seat 57b of the communication port 61 by the spring 56, the second check valve is in the closed state, and the first chamber A And the second chamber B are not in communication.

  Next, as shown in FIG. 6, when the piston head 53 further moves to the left side in the drawing and reaches the position of the left end in the cylinder 51, the volume of the first chamber A becomes close to the maximum, The volume of the second chamber B is close to the minimum. At this time, the first check valve remains open, the pavement material continues to flow into the first chamber A from the suction port 54, and the second check valve remains closed. .

  Next, as shown in FIG. 7, when the moving directions of the piston rods 7a and 7b are reversed and the piston head 53 starts moving toward the right side in the drawing, that is, in the direction in which the volume of the second chamber B increases. The inside of the second chamber B becomes negative pressure, the second ball valve 55b moves to the left in the figure against the biasing force of the spring, and the second check valve is opened. As a result, the communication port 61 connecting the first chamber A and the second chamber B communicates, and the paving material existing in the first chamber A flows into the second chamber B as shown by the arrows in the figure. To do. At this time, even if a part of the pavement material flows between the piston head 53 and the cylinder 51, there is a piston ring 62b that opens an annular groove 63 (not shown) to the right. Any further material is prevented from entering between the cylinder 51 and the piston.

  In the state shown in FIG. 7, pressure is applied to the first chamber as the piston head 53 moves in the right direction, so that the first ball valve 55 a is attached to the first valve seat 57 a of the suction port 54. As a result, the first check valve is closed. Further, as described above, since the cross-sectional area of the second chamber B is smaller than the cross-sectional area of the first chamber A (usually about ½), the piston head 53 decreases as the piston head 53 moves to the right in the figure. Since the volume of the first chamber A is larger than the volume of the second chamber B that increases at the same time, an amount of the paving material corresponding to the difference is discharged from the discharge port 60 to the outside.

  FIG. 8 shows a state where the piston head 53 continues to move in the direction in which the volume of the second chamber B further increases and reaches almost the right end of the stroke, and as shown in FIG. 8, the volume of the first chamber A is shown. The pavement material existing in the first chamber A almost flows into the second chamber B through the communication port 61 and is further discharged from the discharge port 60 to the outside. It will be. At this time, the first check valve remains closed.

  Next, as shown in FIG. 9, when the piston rods 7a and 7b have finished their maximum strokes in the right direction and turned their moving directions to the left as indicated by arrows in the figure, the second chamber In B, pressure accompanying the movement of the piston head 53 is applied, the second ball valve 55b is urged toward the second valve seat 57b, the second check valve is closed, and the communication port 61 is Communication is interrupted. However, since the piston head 53 moves leftward, the pavement material present in the second chamber B is discharged from the discharge port 60 toward the outside as indicated by an arrow in the figure. At this time, although pressure by the piston head 53 is applied to the pavement material existing in the second chamber B, there is a piston ring 62a that opens an annular groove 63 (not shown) to the left, so the pavement material is Entering between the cylinder 51 and the piston is prevented. On the other hand, since the volume of the first chamber A increases as the piston head 53 moves to the left, the first ball valve 55a moves to the left, the first check valve is opened, and the suction port 54 is opened. Therefore, a new paving material will flow into the first chamber A.

  By repeating the above operation, the piston pumps 5a and 5b repeat the suction and discharge of the paving material. As described above, according to the piston pumps 5a and 5b, the piston 52 reciprocates. In any process, since the pavement material is discharged from the discharge port 60, the pulsation of the discharge amount is reduced. Needless to say, if two such piston pumps 5a and 5b are used and the phases of the reciprocating motions of the pistons are shifted from each other by 180 degrees, the pulsation of the discharge amount can be further reduced.

  FIG. 10 is a diagram schematically showing only the piping system of the working vehicle 1 for pavement material dispersion shown in FIGS. 1 and 2. The operation of the working vehicle 1 for pavement material spraying according to the present invention will be described with reference to FIG. First, in order to spray the pavement material from the spray nozzles 10a, 10b..., The on-off valve 17 of the return pipe 16 is closed, and the on-off valves 13a provided on the individual spray nozzles 10a, 10b. 13b is opened, and hydraulic cylinders 6a and 6b (not shown) are operated to cause the piston rods 7a and 7b to start reciprocating. Then, the piston pumps 5a and 5b start to discharge the pavement material, and the discharged pavement material enters the spray bar 9 through the discharge pipe 15 and the first three-way valve 27a. After the pulsation is almost completely removed by the action of 14a, 14b, the spray nozzles 10a, 10b,.

  When the spraying is interrupted or stopped, the on-off valves 13a, 13b,... Provided on the individual spray nozzles 10a, 10b, are closed and the on-off valve 17 provided on the return pipe 16 is opened. To do. Thereby, the pavement material discharged from the piston pumps 5 a and 5 b passes through the spray bar 9 and returns to the material storage tank 2 via the return pipe 16. The paving material that has returned to the material storage tank 2 is agitated in the material storage tank 2 and can wait for suction and discharge by the piston pumps 5a and 5b again without causing material separation. As described above, in the working vehicle for pavement material spraying according to the present invention, even when the pavement material is not sprayed, the piston pumps 5a and 5b are always operated, and the spraying is interrupted or interrupted by switching the on-off valve. Since the stop can be performed, it is possible to spray only the necessary place at any time when necessary, and the excellent advantage that the workability of the construction is improved can be obtained. Of course, when there are a plurality of spray nozzles 10a, 10b,..., Only a part of the on-off valves 13a, 13b,. When spraying from only a part of the plurality of spray nozzles 10a, 10b,..., Spray nozzles that do not spray without completely closing the on-off valve 17 provided in the return line 16. It is also possible to open the pavement material according to the number and return the pavement material that is not sprayed back to the material storage tank 2.

  On the other hand, in order to spread the pavement material on the remaining portion by using the single spray bar 9 ′, the pavement discharged from the piston pumps 5a and 5b is switched by switching the first three-way valve 27a. The flow of the material may be switched to a single spray bar 9 ′. The operator can spray the paving material by moving the single spray bar 9 'to an appropriate position.

  When the spraying of the paving material from the spray nozzles 10a, 10b,... Is completed as described above, or at an appropriate time as necessary, the compressor 19 is operated, and the spray bar 9 and the spray nozzle 10a. .., 10b... Is cleaned with a cleaning liquid stored in the cleaning liquid tank 18, or so-called air blowing is performed with high-pressure air from the compressor 19, or a combination of the two is appropriately combined. It can be carried out. In order to perform cleaning, first, the piston pumps 5a and 5b are stopped, the on-off valve 17 provided in the return pipe 16 is closed, the on-off valve 21 provided in the cleaning liquid pipe 20 is opened, and further the second The three-way valve 27b is switched to the on-off valve 21 side. Then, depending on whether cleaning with a cleaning liquid or air blowing is performed, either the on-off valve 25 or 26 or both are opened alternately, and cleaning with cleaning liquid or air blowing with high-pressure air is called cleaning. Or a combination of both. At this time, if a second return pipe 16 ′ for connecting the discharge pipe 15 and the return pipe 16 via the on-off valve 17 ′ is provided, the on-off valve 17 ′ is opened at the time of cleaning. Accordingly, the cleaning can be performed without stopping the piston pumps 5a and 5b, so that there is an advantage that the cleaning can be performed at any time even during the spraying operation.

  In addition, as described above, in the state where the spray bar 9 is being cleaned, the first three-way valve 27a is switched to the single spray bar 9 ′ side, thereby cleaning the single spray bar 9 ′. It is also possible. Furthermore, the on-off valves 13a, 13b,... Provided in the individual spray nozzles 10a, 10b,... Are cleaned by switching the second three-way valve 27b to the spray nozzle cleaning pipe line 28 side. It is also possible.

  According to the working vehicle for pavement material spraying of the present invention as described above, mechanical stability that is easily decomposed by adding a modified asphalt emulsion modified with rubber or resin, and further a latex or emulsion of rubber or resin. Even binder emulsions such as asphalt emulsions with poor properties can be sprayed in good condition, and the working vehicle for spraying paving materials of the present invention contains fillers and fine aggregates. In particular, when applied to a pavement material such as a binder emulsion such as an asphalt emulsion or a binder emulsion mixture, it exhibits a particularly excellent effect. As a typical example of such a paving material, for example, a bitumen material such as asphalt is used as a binder material, or a combination of a tackifier and a plasticizer is used as a binder material. Paving binder emulsion blended with plastic resin and / or rubber, and paving binder emulsion blended with fine filler such as inorganic filler and coarse sand, fine sand, quartz sand, crushed sand, etc. An emulsion mixture is mentioned. Pavement binder emulsion mixtures containing inorganic fillers and fine aggregates are difficult to disperse with some conventional dispersers using gear pumps. It is a pavement material that must be constructed by leveling instead of flooring.

  According to the working vehicle for paving material spraying of the present invention, even the paving material as described above can be easily and safely sprayed on the road surface or the floor slab. Since it is sprayed by running a work vehicle, it is efficient and can handle a large construction area, and the pavement material layer can be constructed in a relatively thin layer, which also saves material. Is extremely useful.

  For example, in order to construct a pavement having a surface treatment layer or a top coat layer, for example, using the working vehicle for spraying material for pavement of the present invention, first, after sufficiently cleaning the target road surface, as described above The pavement binder emulsion mixture or the pavement binder emulsion is spread on the road surface by using the pavement material spraying work vehicle of the present invention to form a layer by the pavement binder emulsion mixture or the pavement binder emulsion. good. Although there is no particular limitation on the layer thickness of the paving binder emulsion mixture or paving binder emulsion, in the case of the surface treatment layer, it is generally preferable to finish to a layer thickness of 1 to 10 mm. The layer thickness is preferably 0.1 to 2 mm. The surface treatment layer and the top coat layer as described above can be finished in a multilayer of two or more layers. If there is a relatively large crack or a deep crack on the road surface, the crack should be removed before the pavement binder emulsion mixture or pavement binder emulsion layer is formed by spraying. It is preferable to fill a part or all with an appropriate filler. The same applies when there is a pothole or burrowing on the road surface.

  The construction by the working vehicle for pavement material spraying of the present invention is not limited to the construction of the surface treatment layer and the top coat layer described above. For example, when building a layer such as a waterproof layer, an adhesive layer, a stress relieving layer, or a pavement including these layers, it is basically the same. First, the surface of the target road surface, floor slab, etc. After cleaning as appropriate, using the working vehicle for spraying paving material of the present invention, the above-mentioned paving binder emulsion or paving binder emulsion mixture or other appropriate paving material is sprayed, and an appropriate thickness is applied. A layer may be formed.

  As described above, the working vehicle for spreading pavement material according to the present invention is a pavement material containing a binder emulsion such as a modified asphalt emulsion that is easy to disassemble and poor in mechanical stability, and a filler or fine aggregate. Even if it exists, it can spread efficiently, reliably and safely. Scattering with work vehicles is suitable for construction on large-scale areas, and it is possible to change the construction thickness as needed by adjusting the amount of spraying per unit area in a relatively short time over a large area. It is easy to adjust the construction thickness according to the situation and the characteristics of the paving material to be used, and the amount of the paving material to be used is set to an appropriate amount, eliminating waste and extremely effective in reducing the cost. Thus, it is possible to disperse pavement materials that are easy to disassemble and pavement materials containing fillers and / or fine aggregates that are concerned about biting of the materials and wear of the pump itself, safely and efficiently. There is no work vehicle before the filing of the present application, and the present invention has extremely excellent industrial applicability.

Claims (7)

  A material storage tank, a spray bar, a plurality of spray nozzles connected to the spray bar, a piston pump, a pipe line connecting the material storage tank and the suction port of the piston pump, and a discharge port of the piston pump A working vehicle for spraying paving material having a pipe line connecting to a spray bar.   2. The working vehicle for spraying material for paving according to claim 1, further comprising a material return conduit for connecting the spray bar and the material storage tank separately from the conduit connecting the discharge port of the piston pump and the spray bar. .   The working vehicle for material dispersal for paving according to claim 1 or 2, wherein the material storage tank is provided with an agitation and mixing blade for material agitation and / or mixing.   The piston pump has a cylinder, a piston head accommodated in the cylinder so as to be able to reciprocate, and a first chamber and a second chamber partitioned by the piston head. It has a suction port with a check valve that opens during the stroke of increasing the volume, the second chamber has a discharge port, and the piston head has a first chamber, a second chamber, Is a bowl-shaped shape that opens toward the first chamber having a passage communicating therewith, and on the second chamber side of the passage, the piston head is reversely opened during the stroke to increase the volume of the second chamber. The work vehicle for spraying material for paving according to claim 1, 2, or 3, wherein the work pump is a reciprocating pump provided with a stop valve.   On the second chamber side of the piston head, one or more piston rings having at least two pairs of annular grooves arranged in the vicinity of the periphery are provided so that the bottoms of the grooves face each other with their backs facing each other. The working vehicle for spraying paving material according to claim 4.   Using the working vehicle for spraying paving material according to any one of claims 1 to 5, the paving material containing filler and / or fine aggregate is sprayed on the road surface or floor slab, and the paving material. A method for constructing a pavement comprising a hardened layer of a pavement material including a filler and / or fine aggregate, comprising the step of forming a layer.   The method for constructing a pavement according to claim 6, further comprising a step of filling cracks, potholes, or digging existing on the road surface or floor slab before forming the layer of the pavement material.

Images