WO2007007804A1

WO2007007804A1 - Work vehicle for spraying paving material and method of constructing paved body by using the work vehicle

Info

Publication number: WO2007007804A1
Application number: PCT/JP2006/313895
Authority: WO
Inventors: Nobuyuki Ishii; Iwao Kato; Masanori Watanabe; Koki Banba; Hiroshi Midorikawa; Tada-Aki Ikeda
Original assignee: Maru-T Ohtsuka Corp.; Seventech Co., Ltd.; Nichireki Co., Ltd.
Priority date: 2005-07-13
Filing date: 2006-07-12
Publication date: 2007-01-18
Also published as: JPWO2007007804A1; JP4951787B2

Abstract

A work vehicle for spraying paving materials capable of efficiently constructing the thin layers of these paving materials by safely and freely spraying them even if easily decomposable and mechanically unstable binder emulsions and emulsion mixtures containing fillers and fine aggregate are used as the paving materials, and a method of safely and efficiently constructing a paved body at low cost by using the work vehicle for spraying the paving materials. The work vehicle comprises a material storage tank, a spray bar, a plurality of spray nozzles connected the spray bar, a piston pump, a pipeline connecting the material storage tank to the suction port of the piston pump, and a pipeline connecting the discharge port of the piston pump to the spray bar. The method of constructing the paved body uses the work vehicle for spraying these paving materials.

Description

Specification

Work vehicle for spreading pavement material and construction method of pavement using the same

Technical field

TECHNICAL FIELD [0001] The present invention relates to a working vehicle for spreading pavement material and a method for constructing a pavement using the pavement material. More specifically, the present invention relates to a pavement material such as a binder emulsion mixture containing a filler and fine aggregate. Is related to a work vehicle for spreading pavement material on the floor slab and a method for constructing a pavement using the work vehicle.

Background art

Conventionally, as a device for spraying a pavement material such as asphalt on a road surface, a spray device provided with a gear pump has been used (see Japanese Patent Application Laid-Open No. 2004-131958). However, according to the experience of the present inventors, mechanical equipment such as a modified asphalt emulsion or an asphalt emulsion to which resin or rubber emulsion or latex is added is used by using a spraying device equipped with this gear pump. If the stability is poor and the binder emulsion is sprayed, the asphalt emulsion may be decomposed before being discharged from the spray nozzle, which may cause 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 contacts the gear in the gear pump and receives a shearing force to cause friction. This is because decomposition of the asphalt emulsion occurs.

[0003] In addition, 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 mixed into the gear in the gear pump. Clogging between the two causes the pump to stop working or may cause problems that the gears wear and the function of the pump declines early, and the emulsion mixture containing the filler and fine aggregate It was extremely difficult to spray using a conventional spraying device.

[0004] 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, Asphalt emulsion mixture toward spray nozzle There has also been proposed a spraying device that discharges the water (see Japanese Patent Publication No. 60-41163). However, in this pressurizing type spraying device, it takes time to pressurize the tank until the pressure in the tank reaches a sufficient level after containing the asphalt emulsion mixture in the tank, as well as fillers and fine aggregates. In order to discharge an asphalt emulsion mixture whose viscosity has been increased due to mixing, a large pressure is required, the entire apparatus must be pressure-resistant, and there is a drawback that there is a risk of pressurization. In addition, the pressurized spraying device has a problem that it is difficult to spray with a constant composition that easily causes material separation between the asphalt emulsion and the aggregate between the tank and the spray nozzle. It was.

[0005] For this reason, conventionally, an emulsion mixture in which fillers, fine aggregates, and the like are mixed is spread on the road surface in a mixture state using a machine called a spreader bottas (special feature). See JP 2000-27105). However, this method of spreading the emulsion mixture has the disadvantage that it takes time and effort to spread the emulsion mixture to a predetermined thickness, and the construction area does not increase due to poor efficiency. In addition, depending on the leveling, there is a limit to reducing the thickness of the mixture, which inevitably increases the work thickness beyond necessity and increases the cost.

[0006] The present invention has been made to solve the above-mentioned problems of the prior art, and is easily decomposed and has poor mechanical stability, including a binder emulsion, a filler, and a fine aggregate. Even paving materials such as emulsion mixtures can be safely and safely sprayed, and a paving material spraying work vehicle capable of efficiently building a thin layer of the paving material, and the like. It is an object of the present invention to provide a safe and efficient method for constructing a low-cost pavement using a working vehicle for spraying pavement materials.

Disclosure of the invention

[0007] In order to solve the above-mentioned problems, the present inventors diligently conducted research and studies, and as a result, by using a piston pump that is not a conventional gear pump, a kinkder emulsion having poor mechanical stability is obtained. Even if it is an emulsion mixture containing fillers and fine aggregates, it is safe and efficient without causing material biting into the pump operating mechanism and pump wear. Finding that it can be sprayed well, completed the present invention. That is, the present invention includes a material storage tank, a spray bar, a plurality of spray nozzles connected to the spray bar, and a piston pump, and a pipe connecting the material storage tank and the suction port of the piston pump. A pavement material spraying work vehicle having a road and 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 spraying work vehicle By providing this, the above-mentioned problems are solved.

[0009] As described above, the working vehicle for spraying pavement material according to the present invention uses a piston pump as a discharge pump. Therefore, the contact decomposition between the pavement material and the pump components is reduced. Even paving materials, including fine aggregates, can be delivered and sprayed safely and reliably without being pressurized.

[0010] Further, in the working vehicle for spraying material for paving of the present invention, it is preferable to have a return pipe for material connecting the spray bar and the material storage tank. It is possible to keep the paving material circulated and prevent the separation of the paving material by always operating the piston pump, even when spraying from the spray nozzle. it can. In this material storage tank, it is preferable to provide a stirring and mixing blade for stirring and mixing the material. Thus, by providing a stirring and mixing blade in the material storage tank, the material is stored. It is possible to prevent separation of the paving material by stirring, and if necessary, various paving materials are put into the material storage tank and mixed in the material storage tank to produce a paving mixture. The advantage that it can be obtained.

[0011] Furthermore, in the working vehicle for spraying pavement material according to the present invention, the piston pump is a return-acting pump and has a bowl-like shape in which the piston head opens toward the suction port side. As a result, it is preferable to reduce the pulsation of the discharge amount, and because the piston head has a bowl shape, a dead space is generated 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 the reciprocating motion of the piston head. 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 facing away from each other, the piston reciprocates. In any of these steps, the paving material can be prevented from entering between the cylinder and the piston. Even pavement materials including rubber and fine aggregates can be excellently discharged and sprayed without the biting of materials and wear of pistons.

[0012] By using such a working vehicle for spraying pavement material according to the present invention, a layer of a pavement material containing filler and / or fine aggregate on a road surface or floor slab can be applied to a simple method of spraying. Therefore, since it can be constructed with a certain thickness, relatively thin, efficient and safe, it is suitable for construction of a large area and is particularly effective for construction of a surface treatment layer. Further, if the working vehicle for spraying pavement material of the present invention is used, a thin layer of pavement material can be formed by a method called spraying. For example, an appropriate pavement material is sprayed on drainage pavement. Even if the pavement material layer is formed, the surface of the drainage pavement can be rejuvenated or repaired while maintaining the drainage so that the gap is not filled and blocked. Benefits are gained.

Brief Description of Drawings

FIG. 1 is a side view showing an example of a working vehicle for spraying pavement material according to the present invention.

FIG. 2 is a plan view showing an example of a working vehicle for spraying pavement material according to the present invention.

FIG. 3 is a cross-sectional view showing an example of a piston pump used in the present invention.

FIG. 4 is a perspective view of a piston ring.

FIG. 5 is a diagram for explaining the operation of the piston pump.

FIG. 6 is a diagram for explaining the operation of the piston pump.

FIG. 7 is a diagram for explaining the operation of the piston pump.

FIG. 8 is a diagram for explaining the operation of the piston pump.

FIG. 9 is a diagram for explaining the operation of the piston pump.

FIG. 10 is a diagram showing an example of a piping system in a work vehicle for spraying pavement material according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, a working vehicle for spraying a pavement material according to the present invention will be described with reference to the drawings.

[0015] FIG. 1 and FIG. 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. In FIG. 1 and FIG. 2, 1 is a work vehicle for spraying pavement material of the present invention. The example shown shows a self-propelled work vehicle with an engine, The working vehicle 1 for pavement material spraying of the present invention may be, for example, a non-self-propelled vehicle that is towed and travels. Reference numeral 2 denotes a material storage tank for storing pavement material. In the material storage tank 2, a stirring and mixing blade 3 is provided. The stirring and mixing blade 3 is appropriately rotated by the 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 pavement materials are mixed in the material storage tank 2 to produce a pavement mixture. For example, by putting a binder emulsion such as asphalt emulsion and filler or fine aggregate into the material storage tank 2 and mixing them by rotating the stirring and mixing blade 3, the material storage tank 2 A binder emulsion mixture can be produced. The produced binder emulsion mixture can be directly discharged and sprayed by a piston pump, which will be described later, and the paving material spraying work vehicle 1 in this example performs both the manufacturing and the spraying of the paving mixture. It has the advantage of being able to. Needless to say, the material storage tank 2 has an openable and closable opening (not shown) for supplying paving material to the inside. 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 force S for heating or maintaining the paving material at an appropriate temperature can be achieved. I'm going.

[0016] Reference numerals 5a and 5b denote a pair of piston pumps that drive the piston rods 7a and 7b to supply and discharge materials by supplying hydraulic pressure to the hydraulic cylinders 6a and 6b. 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 set as a pair, and the phase of the reciprocation is set to be 180 degrees different in order to reduce pulsation, but the number of piston pumps 5a and 5b The number is not limited to two, but may be one or three or more. In the case of three units, it is recommended to set their reciprocating phases to be 120 degrees apart from each other.

[0017] Reference numeral 9 denotes a spray bar, and the spray bar 9 is provided with a plurality of spray nozzles 10a, 10b. The paver 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 can be moved up and down relative to the work vehicle 1 It is suspended from the mounted base 11, and the vertical position of the base 11 can be changed by the elevating hydraulic cylinders 12a, 12b, and the distance from the spray nozzles 10a, 10b 'to the road surface can be adjusted appropriately. I can do it. In the illustrated example, there is one spray bar 9, but two spray bars 9 are arranged in parallel, and the horizontal position in the vehicle width direction of the pavement material spreading work vehicle 1 is shifted, The spreading width of the paving material may be adjustable, or an attachment that extends the length of the spray bar 9 can be attached to increase the spreading width. Of course, it is possible to change the spreading width of the spray bar 9 by attaching and extending or folding it. Spray nozzles 10a, lOb '''are individually provided with open / close valves 13a, 13b', which can be opened or closed manually or remotely. And the opening can be adjusted.

[0018] Reference numeral 9 'denotes a one-handed spray bar for human power, one end of which is connected to the first three-way valve 27a via a flexible pipe member having a sufficient length. A spray nozzle is attached to the other end of the spray bar 9 'for single burning. By switching the three-way valve 27a, the flow of paving material is switched from the spray bar 9 to the spray bar 9' for single burning. As a result, the work vehicle for spraying pavement material 1 can appropriately apply the pavement material manually to the part that does not have a small advantage or the part that has been left unspread.

[0019] 14a and 14b are 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. Forces omitted for convenience in FIG. 1 16 shown in FIG. 2 is a return pipe for paving material, one end of which is connected to the spray bar 9 via an on-off valve 17 and the other end of the material. Connected to the storage tank 2.

[0020] 18 is a cleaning liquid tank containing a cleaning liquid for cleaning the spray bar 9 and spray nozzles 10a, 10b... It is a compressor that supplies air pressure. Compressed by pneumatic pressure from 19 The cleaning liquid to be discharged is guided to the spray bar 9 through the cleaning liquid pipe 20 and through the second three-way valve 27b and the on-off valve 21 to clean the spray bar 9 and the spray nozzles 10a, 10b '. . It is also possible to supply only high-pressure air from the compressor 19 directly to the spray bar 9 via the pneumatic piping 22, the second three-way valve 27b, and the on-off valve 21, and only cleaning with cleaning liquid and high-pressure air It is possible to repeatedly perform the cleaning by the predetermined pattern, or to select and perform the cleaning with either the cleaning liquid or the air pressure as appropriate. 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 line 28.

[0021] Reference numeral 23 denotes an operation panel, which is operated by operating an appropriate switch or the like to drive and stop the stirring / mixing blade drive motor 4. Change the rotation speed, drive the piston pumps 5a and 5b 'Stop' discharge amount Adjusting the vertical position of the spray bar 9, adjusting the opening / closing of the on-off valves 13a, 13b ... installed on the spray nozzles 10a, 10b ', etc. It can be adjusted. A power generator 24 supplies electric power necessary for the operation of the work 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 capable of reciprocating. The piston 52 is composed of 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 figure and a second chamber B on the left side in the figure.

[0023] 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 sucks the first ball valve 55a and the ball valve 55a. There is provided a first check valve constituted by a panel 56 urging toward the port 54 side and a 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 in from the P and inlet 54 force.

A discharge port 60 connected to a discharge pipe 15 (not shown) is provided above the left end of the second chamber B. 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 the piston of the first chamber A. The cross-sectional area in the plane perpendicular to the moving direction is smaller.

[0025] 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 first chamber A and the first chamber A are formed on the bottom of the bowl head shape. There is a communication port 61 that connects the two rooms B. The communication port 61 is provided with a second ball valve 55b, a panel for urging the ball valve 55b toward the communication port 61, and a second check valve constituted by the second valve seat 57b. Yes.

[0026] 62a and 62b are piston rings arranged on the side of the second chamber B of the piston head 53. The piston rings 62a and 62b have U-shaped cross sections at their peripheral portions as shown in FIG. Annular grooves 63, 63 are provided. As shown in FIG. 4, the piston rings 62a and 62b are arranged 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 both the back and forth movement of the piston head 53. can do. In addition, 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. However, in some cases, only one piece may be arranged in the direction of the piston ring 62a. You can arrange two of them in the direction of the piston ring 62a, or you can arrange three or more. 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, a single piston ring with annular grooves 63, 63 on both sides can be used.

[0027] 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. As a material for the piston 52, it is usually preferable to use a metal such as stainless steel, steel, or aluminum. For those metals, a chromium plating with a thickness of 0.02 mm or more, more preferably 0.1 mm or more is used. I want to give it. Further, as the material of the ball valves 55a and 55b, it is possible to reduce wear due to fillers and fine aggregates by using ceramic which is preferably ceramic. As a material for the piston rings 62a and 62b, it is preferable to use a urethane resin, although it is preferable to use a flexible resin. [0028] Next, with reference to FIG. 5 to FIG. 9, the suction arch and the discharge operation of the piston pumps 5a and 5b will be described. 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 figure by the operation of a hydraulic cylinder (not shown). When moving to the left, the volume of the first chamber A increases and the pressure in the first chamber A becomes negative, so the first ball valve 55a moves to the left in the figure against the biasing force of the spring 56 (not shown). Moves and the first check valve opens. When the first check valve is opened, the pavement material is sucked into the first chamber A from the suction port 54 as shown by the arrow in the figure and flows in. At this time, since the second ball valve 55b is urged toward the second valve seat 57b of the communication port 61 by the spring 56, the second check valve is closed and the first chamber A And Room B are not in communication.

[0029] Next, as shown in FIG. 6, when the piston head 53 further moves to the left side in the drawing and reaches the position almost at the left end in the cylinder 51, the volume of the first chamber A becomes close to the maximum. On the other hand, 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, the moving directions of the piston rods 7a and 7b are reversed, and the piston head 53 moves toward the right side in the drawing, that is, in the direction in which the volume of the second chamber B increases. Is started, the inside of the second chamber B becomes negative pressure, the second ball valve 55b moves to the left in the figure against the urging force of the panel, 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 enters the second chamber B as indicated by the arrow in the figure. Inflow. At this time, even if a part of the paving 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. This prevents the material from entering further 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 to the right, so that the first ball valve 55a is connected to the first valve seat 57a of the suction port 54. The first check valve is closed. As described above, the cross-sectional area of the second chamber B is smaller than the cross-sectional area of the first chamber A (usually about 1/2), so that the piston head 53 moves to the right in the figure. Since the volume of the first chamber A that decreases by moving to the second chamber is larger than the volume of the second chamber B that increases at the same time, an amount of paving material corresponding to the difference is discharged from the discharge port 60 to the outside. It will be.

FIG. 8 shows a state in which 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. The volume of A is almost minimized, and most of the paving material that was present in the first chamber A flows into the second chamber B through the communication port 61, and further from the discharge port 60 to the outside. It will be discharged. At this time, the first check valve remains closed.

Next, as shown in FIG. 9, when the piston rods 7a and 7b end their maximum strokes in the right direction and turn their moving directions to the left as shown by arrows in the figure, In the second chamber B, pressure is applied due to the movement of the piston head 53, the second ball valve 55b is urged toward the second valve seat 57b, the second check valve is closed, and the communication is established. Mouth 61 is blocked from communication. However, since the piston head 53 moves leftward, the paving material in the second chamber B is discharged from the discharge port 60 to the outside as indicated by the 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 the annular groove 63 (not shown) to the left, so the pavement material is The entry between the cylinder 51 and the piston is prevented. On the other hand, since the volume of the first chamber A increases due to the leftward movement of the piston head 53, the first ball valve 55a moves to the left, the first check valve opens, and the suction port 54 As a result, new paving material flows into the first chamber A.

[0034] By repeating the operation as described above, 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 However, in any stroke of the reciprocating motion, the pavement material is discharged from the discharge port 60, so that 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 motion 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 spraying according to the present invention shown in FIGS. 1 and 2. Fig. 10 is used to spread the paving material of the present invention. The operation of the work vehicle 1 will be described. First, in order to spray pavement material from the spray nozzles 10a, 10b—the on-off valve 17 of the return line 16 is closed, and the individual on-off spray valves 10a, 1 (on-off valves 13a, 13b 'is opened and hydraulic cylinders 6a and 6b (not shown) are operated to start reciprocating movement of the piston rods 7a and 7b. Then, the piston pumps 5a and 5b start discharging the paving material, The discharged pavement material enters the spray bar 9 through the discharge pipe 15 and the first three-way valve 27a, and after the pulsation is almost completely removed by the operation of the accumulators 14a and 14b, the spray material is sprayed. Dispersed from the nozzles 10a and 10 ".

[0036] When the spraying is interrupted or stopped, the on-off valves 13a, 13b ... provided in the individual spray nozzles 10a, lOb '' 'are closed, and the on-off valve 17 provided in the return pipe 16 is opened. And As a result, the pavement material discharged from the piston pumps 5a and 5b 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 again by the piston pumps 5a and 5b without causing material separation. As described above, in the working vehicle for spraying paving material according to the present invention, even when the paving material is not sprayed, the piston pumps 5a and 5b are always operated, and spraying and interruption or switching are performed by switching the on-off valve. Since it can be stopped, it is possible to disperse only the necessary place at any time, and it is possible to obtain an excellent advantage that the workability of the construction is improved. Of course, when there are a plurality of spray nozzles 10a, 10b-, only a part of the open / close valves 13a, 13b,... Can be opened, and the spreading width of the paving material can be appropriately changed. When spraying only from a part of the spray nozzles 10a, lOb '", do not spray completely without closing the on-off valve 17 provided in the return line 16. The pavement material that is not sprayed can be returned to the material storage tank 2 by opening at an opening corresponding to the number.

[0037] On the other hand, in order to spray the pavement material on the remaining sprayed portion using the spray bar 9 ', the first three-way valve 27a is switched and discharged from the piston pumps 5a and 5b. Switch the flow of pavement material to a single spray bar 9 '. The operator moves the single spray bar 9 ′ to an appropriate position and sprays the paving material. That power S.

[0038] When the spraying of the pavement material from the spray nozzle 10a, lOb '' 'is completed as described above, or at an appropriate time as necessary, the compressor 19 is operated and the spray bar 9 And spray nozzles 10a, 10 "are washed with the washing liquid contained in the washing liquid tank 18, and the so-called air blowing is performed with the high-pressure air from the compressor 19, or both of them are appropriately used. To perform cleaning, first stop the piston pumps 5a and 5b, close the on-off valve 17 provided in the return pipe 16 and close the on-off valve provided in the cleaning liquid pipe 20. 21 is opened and the second three-way valve 27b is switched to the side of the on-off valve 21. Then, cleaning with the cleaning liquid is performed. Z In this case, cleaning with a cleaning liquid, cleaning with air blowing with high-pressure air, or cleaning with a combination of both is performed. If a second return line 16 ′ is connected via an on-off valve 17 ′, the piston pumps 5 a and 5 b can be stopped without stopping by opening the on-off valve 17 ′ during cleaning. Since cleaning can be performed, there is an advantage that cleaning can be performed at any time even during the spraying operation.

[0039] Further, as described above, by switching the first three-way valve 27a to the single spray bar 9 'side while the spray bar 9 is being washed, the single spray bar 9' It is also possible to perform cleaning. Further, by switching the second three-way valve 27b to the spray nozzle cleaning pipe 28 side, the on-off valves 13a, 13b,... Provided in the individual spray nozzles 10a, 10b '. Is also possible.

[0040] According to the working vehicle for spraying paving material of the present invention as described above, the modified asphalt emulsion modified by rubber or resin, and further latex or emulsion of rubber or resin is added and decomposed. Even binder emulsions such as asphalt emulsions with poor mechanical stability, which can be sprayed in good condition, are further provided with a working vehicle for spraying paving materials according to the present invention. It is particularly effective when applied to pavement materials such as binder emulsions such as asphalt emulsions and binder emulsion mixtures. Typical examples of such paving materials include, for example, A binder emulsion for paving, in which a bituminous material such as Falto is used as a binder material, or a combination of a tackifier and a plasticizer is used as a binder material, and a thermoplastic resin and / or rubber is blended therewith, In addition, a paving binder emulsion mixture in which fine fillers such as an inorganic filler, coarse sand, fine sand, silica sand, and crushed sand are further added to the pavement binder emulsion. Pavement binder emulsion mixtures containing inorganic fillers and fine aggregates are difficult to disperse with conventional dispersers using gear pumps. Other paving materials are constructed by leveling rather than spraying.

[0041] According to the working vehicle for spraying paving material of the present invention, even the paving material as described above can be sprayed on the road surface or floor slab easily and safely. Since it is sprayed by running a work vehicle, it can cope with a large construction area with good efficiency, and the pavement material layer can be constructed in a relatively thin layer, thus saving material. It is extremely useful.

[0042] For example, in order to construct a pavement having a surface treatment layer or a topcoat layer using the work vehicle for spraying a pavement material according to the present invention, first, after sufficiently cleaning the target road surface, A pavement binder emulsion mixture or a pavement binder emulsion is sprayed onto the road surface using the pavement material application work vehicle of the present invention, and a pavement binder emulsion mixture or a pavement binder emulsion layer is formed. It is only necessary to form. Although there is no particular limitation on the layer thickness of the paving binder emulsion mixture or paving binder emulsion, in the case of surface treatment layer, it is generally preferred to finish with a layer thickness of 1 to 10mm. In this case, it is preferable to finish with a layer thickness of 0.:!~2mm. The surface treatment layer or 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 are potholes or pits on the road surface.

[0043] The construction using the working vehicle for spraying a pavement material of the present invention is not limited to the construction of the surface treatment layer and the top coat layer described above. For example, a layer such as a waterproof layer, an adhesive layer, a stress relaxation layer, or The same applies to the construction of a pavement with these layers. First, the surface of the target road surface, floor slab, etc. is first cleaned as appropriate, and then the pavement material application of the present invention is applied. A working vehicle may be used to spray a pavement binder emulsion or pavement binder emulsion mixture as described above, or any other suitable pavement material to form a layer having an appropriate thickness. Industrial applicability

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 a fine aggregate. Even if it exists, it can be sprayed efficiently and surely and safely. Scattering with work vehicles is suitable for large-scale construction, and it is possible to change the construction thickness appropriately by adjusting the amount of spraying per unit area for a large area in a relatively short time. It is easy to adjust the construction thickness according to the conditions of the site and the characteristics of the paving material to be used. The amount of paving material to be used is appropriate, eliminating waste and extremely effective in reducing costs. It is possible to disperse pavement materials that are easy to disassemble and pavement materials that contain fillers and Z 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 that can be used before the filing of the present application, and the present invention has extremely excellent industrial applicability.

Claims

The scope of the claims

[1] A material storage tank, a spray bar, a plurality of spray nozzles connected to the spray bar, and a piston pump, a pipe line connecting the material storage tank and the piston pump inlet, and a piston pump A working vehicle for spraying pavement materials, having a discharge pipe and a pipe connecting the spray bar.

[2] The material distribution for pavement according to claim 1, further comprising a material return pipe that connects the spray bar and the material storage tank separately from the pipe that connects the discharge port of the piston pump and the spray bar. Work vehicle.

[3] The work material spraying work vehicle according to claim 1 or 2, wherein the material storage tank is provided with a stirring and mixing blade for stirring and / or mixing the material.

[4] Piston pump force A cylinder, a piston head reciprocally accommodated in the cylinder, a first chamber and a second chamber partitioned by the piston head, wherein the piston head is the first chamber. It has a suction port with a check valve that opens during the stroke to increase the volume of the chamber, the second chamber has a discharge port, and the piston head is located at the center bottom at the first and second chambers. It has a bowl-like shape that opens toward the first chamber having a passage communicating with the chamber, and the piston head is opened on the second chamber side of the passage during the stroke to increase the volume of the second chamber. 4. A work vehicle for spraying pavement material according to claim 1, wherein the work vehicle is a reciprocating pump equipped with a check valve.

[5] One or more pistons having at least two pairs of annular grooves arranged in the vicinity of the periphery on the second chamber side of the piston head so that the bottoms of the grooves face each other with their backs facing each other The work vehicle for spraying paving material according to claim 4, wherein a ring is provided.

[6] Claim: Using the working vehicle for spraying paving material according to any one of! To 5, paving material containing filler and / or fine aggregate on the road surface or floor slab. A method for constructing a pavement comprising a hardened layer of a pavement material including filler and / or fine aggregate, comprising a step of spraying and forming a layer of the pavement material.

[7] The 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. Construction method