JP7635505B2 - Asphalt finisher and road surface paving system - Google Patents

Description

The present invention relates to an asphalt finisher and a road paving system.

Conventionally, there has been known an asphalt finisher that includes a tractor, a hopper installed in front of the tractor to receive paving material, a conveyor that feeds the paving material in the hopper to the rear of the tractor, a screw that spreads the paving material fed by the conveyor behind the tractor, and a screed that evens out the paving material spread by the screw behind the screw.

When an asphalt finisher carries out construction work, they create a design drawing and then spread the paving material evenly over the road surface based on the drawing. Various technologies have been proposed to make this construction easier. For example, Patent Document 1 proposes a technology that displays the road conditions to allow users to know the amount of mix required.

International Publication No. 2020/196540

However, when an asphalt finisher spreads the paving material, the degree of compaction of the paving material spread over each area of the road surface (in other words, the ratio of paving material to voids) may differ from what was assumed when the design drawings were created.

In view of the above, by measuring the degree of compaction (the ratio of paving material to voids) of paving material spread evenly on the road surface, it becomes easier to understand the condition of the constructed road surface.

An asphalt finisher according to one aspect of the present invention includes a tractor, a hopper installed in front of the tractor, a conveyor that transports the paving material in the hopper to the rear of the tractor, a screw that spreads the paving material transported by the conveyor and scattered on a road surface in the vehicle width direction, a screed device that spreads the paving material spread by the screw behind the screw, and a measuring device that measures compaction information that indicates the degree of compaction , which is the ratio of the paving material spread and leveled on the road surface to voids, and The weight of the paving material spread on the already-paved road surface is calculated based on the thickness, the construction width of the already-paved road surface over which the paving material has been spread, and the distance of the already-paved road surface over which the paving material has been spread. If there is a difference between the weight of the paving material spread on the already-paved road surface and the set weight of the paving material that was set as intended for use on the already-paved road surface, an estimated weight of the paving material that is expected to be used on the road surface to be constructed is calculated based on the difference and the set weight of the paving material that was set as intended for use on the road surface to be constructed.

According to one aspect of the present invention, the degree of compaction of paving material spread evenly on a road surface (the ratio of paving material to voids) is measured, making it easier to understand the condition of the constructed road surface.

FIG. 1A is a left side view showing an asphalt finisher, which is an example of a road machine according to an embodiment. FIG. 1B is a top view showing an asphalt finisher, which is an example of a road machine according to an embodiment. FIG. 2A is a left side view showing an asphalt finisher, which is an example of a road machine according to a modified example. FIG. 2B is a top view showing an asphalt finisher, which is an example of a road machine according to a modified example. FIG. 3 is a block diagram illustrating an example of the configuration of a controller and devices connected to the controller according to the embodiment. FIG. 4 is a diagram illustrating an example of an average value of the compaction degree for each predetermined region calculated by the compaction degree calculation unit according to the embodiment. FIG. 5 is a diagram illustrating an example of the configuration of the construction management system according to the embodiment. FIG. 6 is a diagram showing an asphalt finisher, a dump truck, and a road roller, which are examples of road machines according to the embodiment. FIG. 7 is a diagram showing the state of a road surface on which work is performed by the asphalt finisher according to the embodiment. FIG. 8 is a diagram illustrating a construction information management sheet generated by the information generating unit according to the embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the same or corresponding components in each drawing are designated by the same reference numerals, and the description thereof may be omitted.

1A and 1B are diagrams showing an asphalt finisher 100, which is an example of a road machine according to an embodiment. Specifically, FIG. 1A is a left side view, and FIG. 1B is a top view.

The asphalt finisher 100 is mainly composed of a tractor 1, a hopper 2, and a screed 3 (an example of a screed device). In the following, the direction of the hopper 2 as seen from the tractor 1 (+X direction) is defined as the front, and the direction of the screed 3 as seen from the tractor 1 (-X direction) is defined as the rear. The road machine may be a base paver, a tuck paver, a multi-asphalt paver, or the like. A compaction meter 8 is further provided behind the asphalt finisher 100 of this embodiment.

The tractor 1 is a mechanism for moving the asphalt finisher 100. In this embodiment, the tractor 1 rotates the rear wheels 5 using a rear-wheel drive hydraulic motor, and rotates the front wheels 6 using a front-wheel drive hydraulic motor to move the asphalt finisher 100. The rear-wheel drive hydraulic motor and the front-wheel drive hydraulic motor rotate by receiving hydraulic oil from a hydraulic pump. The rear wheels 5 and the front wheels 6 may be replaced with crawlers. The drive motor may be an electric motor.

The hopper 2 is a mechanism for receiving paving material. In this embodiment, the hopper 2 is installed in front of the tractor 1 and is configured to be opened and closed in the vehicle width direction (Y-axis direction) by a hopper cylinder. The asphalt finisher 100 usually receives paving material (e.g., asphalt mixture) from the bed of a dump truck with the hopper 2 fully open. A dump truck is an example of a transport vehicle that transports paving material. Figures 1A and 1B show the hopper 2 in a fully open state. When the paving material in the hopper 2 decreases, the hopper 2 is closed, and the paving material near the inner wall of the hopper 2 is collected in the center of the hopper 2. This is to enable the conveyor CV in the center of the hopper 2 to feed the paving material to the rear side of the tractor 1. The paving material fed to the rear side of the tractor 1 is spread in the vehicle width direction by the screw SC behind the tractor 1 and in front of the screed 3. In this embodiment, the screw SC is in a state in which the extension screws are connected to the left and right. 1A and 1B show the paving material PV spread by the screw SC in a dot pattern.

The screed 3 is a mechanism for spreading and leveling the paving material PV. In this embodiment, the screed 3 includes a front screed 30 and a rear screed 31, as shown in FIG. 1B. The front screed 30 includes a left front screed 30L and a right front screed 30R. The rear screed 31 includes a left rear screed 31L and a right rear screed 31R. The screed 3 is a floating screed towed by the tractor 1, and is connected to the tractor 1 via a leveling arm 3A.

The screed 3 is moved up and down together with the leveling arm 3A by the extension and contraction of the screed lift cylinder 24.

The leveling cylinder 23 is a hydraulic cylinder that moves the front end portion of the leveling arm 3A up and down to adjust the spreading thickness of the paving material. In this embodiment, the cylinder portion of the leveling cylinder 23 is connected to the tractor 1, and the rod portion is connected to the connection portion of the leveling arm 3A with the tractor 1. When increasing the spreading thickness, the controller 50 causes the hydraulic oil discharged by the hydraulic pump to flow into the rod side oil chamber of the leveling cylinder 23, contracting the leveling cylinder 23 to raise the leveling arm 3A. On the other hand, when decreasing the spreading thickness, the controller 50 causes the hydraulic oil in the rod side oil chamber of the leveling cylinder 23 to flow out, and extends the leveling cylinder 23 to lower the leveling arm 3A.

The screed lift cylinder 24 is a hydraulic cylinder for lifting the screed 3. In this embodiment, the screed lift cylinder 24 has a cylinder portion connected to the tractor 1 and a rod portion connected to the rear end portion of the leveling arm 3A. When lifting the screed 3, the controller 50 causes the hydraulic oil discharged by the hydraulic pump to flow into the rod side oil chamber of the screed lift cylinder 24. As a result, the screed lift cylinder 24 contracts, the rear end portion of the leveling arm 3A is lifted, and the screed 3 is lifted. On the other hand, when the lifted screed 3 is lowered, the controller 50 allows the hydraulic oil in the rod side oil chamber of the screed lift cylinder 24 to flow out. As a result, the screed lift cylinder 24 extends due to the weight of the screed 3, and the rear end portion of the leveling arm 3A is lowered, and the screed 3 is lowered.

A moldboard 43 is attached to the front of the screed 3. The moldboard 43 is configured to adjust the amount of paving material PV retained in front of the screed 3. The paving material PV passes through the gap between the lower end of the moldboard 43 and the roadbed BS and reaches under the screed 3.

The screed 3 is provided with a left front tamper 25L, a right front tamper 25R, a left rear tamper 26L, and a right rear tamper 26R (hereinafter collectively referred to as tampers 25, 26). The left front screed 30L performs finishing on the road surface that has been compacted and spread by the left front tamper 25L. The right front screed 30R performs finishing on the road surface that has been compacted and spread by the right front tamper 25R. The left rear screed 31L performs finishing on the road surface that has been compacted and spread by the left rear tamper 26L. The right rear screed 31R performs finishing on the road surface that has been compacted and spread by the right rear tamper 26R.

The tampers 25 and 26 move the tamper edge (not shown) up and down via a tamper shaft (not shown), part of which is eccentric, by the rotation of a motor (not shown) provided on the screed 3. In this way, the tampers 25 and 26 compact the road surface.

The screed 3 is provided with a left front vibrator 27L, a right front vibrator 27R, a left rear vibrator 28L, and a right rear vibrator 28R (hereinafter collectively referred to as vibrators 27, 28). The left front screed 30L is vibrated by the left front vibrator 27L, and the right front screed 30R is vibrated by the right front vibrator 27R. The left rear screed 31L is vibrated by the left rear vibrator 28L, and the right rear screed 31R is vibrated by the right rear vibrator 28R.

Vibrators 27, 28 are vibration devices for compacting the pavement surface. In this embodiment, vibrators 27, 28 are eccentric vibrators driven by a hydraulic motor. However, the vibrators may also be driven by an electric motor or may be linear vibrators. The vibration frequency in this embodiment is changed depending on the type of pavement material, etc.

The compaction degree measuring instrument 8 is provided behind the screed 3 (-X direction). In this embodiment, the compaction degree measuring instrument 8 is directly connected to the screed 3. The compaction degree measuring instrument 8 may be provided with wheels (not shown). This allows the road surface for which the compaction degree is measured to be changed according to the progress of the asphalt finisher 100.

The compaction meter 8 measures the degree of compaction (hereinafter also referred to as the compaction degree), which is the ratio of the pavement material spread on the road surface to the voids. The compaction meter 8 has a positive electrode and a negative electrode arranged on the bottom surface of the compaction meter 8, for example. The compaction degree of the pavement material is measured based on the magnetic field generated between the positive electrode and the negative electrode and the electromagnetic characteristics of the pavement material. Note that this embodiment shows an example of a method for measuring the compaction degree of the pavement material, and any method may be used, regardless of whether it is a well-known method.

In this embodiment, multiple compaction meters 8 are provided in the vehicle width direction (Y-axis direction). The asphalt finisher 100 according to this embodiment is arranged so that it can measure the entire area in the width direction of the screed 3 in order to measure the compaction degree of the paving material PV spread evenly by the screed 3. In this embodiment, six compaction meters 8 are provided. When referring to each of the compaction meters 8, they are represented as compaction meters 8_1 to 8_6. Note that this embodiment does not limit the number of compaction meters 8 to six, and an appropriate number is installed depending on the length in the vehicle width direction over which the asphalt finisher 100 spreads the paving material.

1A and 1B, in this embodiment, the compaction meters 8 are installed with gaps between them. However, this embodiment is not limited to the method of installing the compaction meters 8 with gaps between them, and for example, the compaction meters 8 may be installed so that their measurement ranges overlap. As an example of an arrangement in which the measurement ranges overlap, it is possible to arrange two rows of compaction meters 8 alternately in the vehicle width direction (Y-axis direction) (arranged in a staggered arrangement) and arrange the compaction meters 8 so that the ends of the compaction meters 8 in one row overlap the ends of the compaction meters 8 in the other row in the vehicle width direction (Y-axis direction).

The controller 50 is a control device that controls the asphalt finisher 100. In this embodiment, the controller 50 is configured as a microcomputer including a CPU, memory, non-volatile storage device, etc., and is mounted on the tractor 1. Each function of the controller 50 is realized by the CPU executing a program stored in the non-volatile storage device. However, each function of the controller 50 may be configured as hardware or firmware.

The communication device 53 is configured to be able to control communication between the asphalt finisher 100 and equipment external to the asphalt finisher 100. The communication device 53 in this embodiment is installed in front of the driver's seat 1S and controls communication via a mobile phone communication network, a short-range wireless communication network, a satellite communication network, or the like.

The GPS module 54 is an example of a GNSS (Global Navigation Satellite System) module, and receives location information indicating the results of two-dimensional positioning (two-dimensional positioning) by the GPS (Global Positioning System). The location information includes information expressing the position of the asphalt finisher 100 in latitude and longitude. Note that, although this embodiment uses GPS as a method for acquiring location information, the method for acquiring location information is not limited thereto, and other well-known methods may be used.

A spatial recognition device 51 is attached to the tractor 1. The spatial recognition device 51 is configured to acquire information about the space around the asphalt finisher 100 and output the acquired information to the controller 50. The spatial recognition device 51 according to this embodiment includes a forward monitoring device 51F and a rear monitoring device 51B.

The forward monitoring device 51F is configured to monitor the area in front of the asphalt finisher 100. In this embodiment, the forward monitoring device 51F is a LIDAR with a monitoring range RF of the space in front of the tractor 1, and is attached to the center of the front end of the top surface of the tractor 1. The forward monitoring device 51F may be attached to other locations on the asphalt finisher 100.

The rear monitoring device 51B is configured to monitor the rear of the asphalt finisher 100. In this embodiment, the rear monitoring device 51B is a LIDAR with a monitoring range RB of the space behind the screed 3, and is attached to a guide rail 1G that functions as a handrail for the operator of the asphalt finisher 100. The rear monitoring device 51B may be attached to the lower part of the driver's seat 1S or to another part of the asphalt finisher 100.

The spatial recognition device 51 may include a side monitoring device configured to monitor the sides of the asphalt finisher 100. In this case, the side monitoring device may be attached to the left end of the top surface of the tractor 1 forward of the rear wheels 5 as a LIDAR whose monitoring range is the space to the left of the tractor 1. The side monitoring device may be attached to the right end of the top surface of the tractor 1 forward of the rear wheels 5 as a LIDAR whose monitoring range is the space to the right of the tractor 1.

The LIDAR measures the distance between, for example, one million or more points within the monitoring range and the LIDAR. However, at least one of the forward monitoring device 51F and the rear monitoring device 51B may be a monocular camera, a stereo camera, a millimeter wave radar, a laser radar, a laser scanner, a distance image camera, or a laser range finder. The same applies to the side monitoring device. In the embodiment, an example using LIDAR as an example of the spatial recognition device 51 is described. However, this embodiment does not limit the spatial recognition device 51 to LIDAR. In other words, it is sufficient that the spatial recognition device is capable of recognizing a space based on the asphalt finisher 100.

The monitoring range RF of the forward monitoring device 51F preferably includes the roadbed BS. The same applies to the monitoring range of the side monitoring device. In this embodiment, the monitoring range RF has a width greater than the width of the roadbed BS.

The monitoring range RB of the rear monitoring device 51B preferably includes the new pavement NP. In this embodiment, the monitoring range RB has a width greater than the width of the new pavement NP.

The measurement information detected by the spatial recognition device 51 in this embodiment is transmitted to the controller 50. The controller 50 may automatically steer the asphalt finisher 100 based on the received measurement information, or may notify the driver with an alarm or the like.

Furthermore, this embodiment does not limit the manner in which the compaction measuring device 8 is provided on the asphalt finisher 100 to a manner in which it is directly connected to the screed 3.

2A and 2B are diagrams showing an asphalt finisher 100, which is an example of a road machine according to a modified example. Specifically, FIG. 2A is a left side view, and FIG. 2B is a top view. In the modified example shown in FIG. 2A and FIG. 2B, the compaction measuring device 8 and the tractor 1 are connected via frame members 81A and 81B.

That is, the frame member 81B extends from the tractor 1 toward the rear in the direction of travel (negative X-axis direction). The frame member 81A is connected to the end of the frame member 81B toward the rear in the direction of travel (negative X-axis direction). The frame member 81A extends in the vehicle width direction (Y-axis direction) of the asphalt finisher. Six compaction meters 8_1 to 8_6 are provided at predetermined intervals on the frame member 81A. Wheels (not shown) may also be provided on the six compaction meters 8_1 to 8_6 or the frame member 81A. With this configuration, the compaction meters 8 are towed by the asphalt finisher 100 as it moves.

Furthermore, the frame member 81A is not limited to being extended from the tractor 1, but may be extended from the leveling arm 3A. This embodiment and the modified example show one mode of connection of the compaction measuring instruments 8_1 to 8_6, and other connection modes may be used.

Returning to this embodiment, we will explain the controller 50 mounted on the asphalt finisher 100. Figure 3 is a block diagram showing an example configuration of the controller 50 and the equipment connected to the controller 50.

As shown in FIG. 3, the controller 50 is connected to six compaction measuring instruments 8_1 to 8_6, a GPS module 54, a forward monitoring device 51F, a rear monitoring device 51B, an on-board display device 52, and a communication device 53.

The controller 50 is equipped with a readable/writable non-volatile storage medium (not shown) and has a memory unit 50l for storing various information in the storage medium.

The memory unit 50l stores design information. The design information indicates information that is set in advance for each of the specified items for paving with asphalt. The design information includes, for example, a set length indicating the length of the road surface on which the asphalt is laid, a set width indicating the width of the road surface on which the asphalt is laid, a set thickness indicating the thickness to which the asphalt is to be laid, and a set compaction degree indicating the degree of compaction of the asphalt to be laid on the road surface.

The controller 50 includes, as functional elements, an acquisition unit 50a, a thickness calculation unit 50b, a compaction degree calculation unit 50c, a volume calculation unit 50d, a weight calculation unit 50f, a scheduled weight estimation unit 50g, a control correction unit 50h, a communication control unit 50i, an information generation unit 50j, and a display control unit 50k. In this embodiment, the above-mentioned functional elements are shown separately for convenience of explanation, but they do not need to be physically separated and may be composed entirely or partially of common software or hardware components.

The acquisition unit 50a acquires measurement information from various sensors. For example, the acquisition unit 50a acquires measurement information from the forward monitoring device 51F and the rearward monitoring device 51B.

Furthermore, the acquisition unit 50a acquires the compaction from each of the compaction measuring instruments 8_1 to 8_6. Furthermore, the acquisition unit 50a acquires location information from the GPS module 54.

The thickness calculation unit 50b calculates the thickness of the pavement NP newly installed on the road surface. The thickness calculation unit 50b according to this embodiment calculates the thickness of the pavement NP (the vertical distance from the surface of the roadbed BS to the surface of the pavement NP) based on the Z-axis distance of the surface of the roadbed BS based on the asphalt finisher 100, which is indicated by the measurement information from the forward monitoring device 51F, and the Z-axis distance of the surface of the newly installed pavement NP based on the asphalt finisher 100, which is indicated by the measurement information from the rear monitoring device 51B.

The thickness calculation unit 50b may also calculate the thickness of the pavement NP from the position coordinates on a three-dimensional coordinate system. The three-dimensional coordinate system used to calculate the thickness of the pavement NP is, for example, the World Geodetic System. The World Geodetic System is a three-dimensional orthogonal XYZ coordinate system with the origin at the center of gravity of the Earth, the X axis in the direction of the intersection of the Greenwich meridian and the equator, the Y axis in the direction of 90 degrees east longitude, and the Z axis in the direction of the North Pole. Specifically, the thickness calculation unit 50b derives the surface height of the roadbed BS in the reference coordinate system through coordinate conversion between the local coordinate system and the reference coordinate system related to the forward monitoring device 51F. The thickness calculation unit 50b also derives the surface height of the new pavement NP in the reference coordinate system through coordinate conversion between the local coordinate system and the reference coordinate system related to the rear monitoring device 51B. The thickness calculation unit 50b then calculates the thickness of the pavement NP from the difference in surface height.

In this embodiment, the thickness calculation unit 50b uses the above-mentioned calculation method to calculate the thickness of the pavement NP for each specified area described below.

In this embodiment, the method of calculating the thickness is not limited to the method using the forward monitoring device 51F and the rear monitoring device 51B, and the thickness may be calculated using another method. For example, the thickness calculation unit 50b may calculate the thickness based on the difference between the height of the road surface before paving and leveling, measured by a measuring device, and the bottom surface of the screed 3.

The compaction degree calculation unit 50c in this embodiment calculates the average value of the degree of compaction (hereinafter, the proportion of paving material in the space formed by voids and paving material, hereinafter also referred to as the compaction degree) spread and leveled by the asphalt finisher 100 for each area corresponding to each of the compaction degree measuring devices 8_1 to 8_6.

Figure 4 is a diagram illustrating an example of the average degree of compaction for each specified region calculated by the compaction degree calculation unit 50c. As shown in Figure 4, in the vehicle width direction (Y-axis direction), regions 701-706 are divided into sections at lengths assigned to compaction degree measuring instruments 8_1-8_6. The lengths dividing the regions in the traveling direction (X-axis direction) are predetermined lengths and are determined according to the embodiment.

In the example shown in Figure 4, areas 721-726 are shown where the degree of compaction is lower than the predetermined range, and areas 711-712 are shown where the degree of compaction is higher than the predetermined range. The predetermined range indicates a range that is appropriate for the degree of compaction of the paving material laid and leveled by the asphalt finisher 100. The predetermined range is determined according to the type of paving material, etc. In this embodiment, various controls are performed for each calculated area according to the average value of the degree of compaction.

Returning to FIG. 3, the volume calculation unit 50d calculates the volume of the paving material that has been spread and leveled on the road surface that has actually been leveled (an example of a leveled road surface). The volume calculation unit 50d of this embodiment calculates the volume of the paving material that has been leveled based on the thickness of the pavement NP calculated by the thickness calculation unit 50b, the distance that has been worked, and the width of the work. The distance that has been worked may be calculated from the position information acquired by the acquisition unit 50a at the start of work and the position information currently acquired by the acquisition unit 50a, or may be calculated from the travel distance of the asphalt finisher 100 acquired from a distance sensor or the like. The width of the work may be the width of the screed 3 of the asphalt finisher 100, or may be the width of the road indicated in the design information stored in the memory unit 50l. The volume calculation unit 50d may derive the calculated volume as a combination of volumes for each predetermined area.

The weight calculation unit 50f calculates the weight of the paving material used on the road surface on which the paving material has been spread and leveled (an example of a leveled road surface) based on the degree of compaction (the degree of compaction between the paving material and voids) for each specified area calculated by the compaction degree calculation unit 50c and the leveled volume (combination of the volumes for each specified area) calculated by the volume calculation unit 50d.

The weight calculation unit 50f calculates the weight of each predetermined area from the degree of compaction of each predetermined area and the weight (specific gravity) of the paving material per unit volume. The weight calculation unit 50f then calculates the weight of the paving material used in construction from a combination of the weight of each predetermined area and the volume of each predetermined area calculated by the volume calculation unit 50d.

The planned weight estimation unit 50g estimates the weight of the paving material that the asphalt finisher 100 will actually use (hereinafter, also referred to as the estimated weight). The planned weight estimation unit 50g according to this embodiment calculates the difference (e.g., ratio) between the weight RW1 of the paving material that has already been used and the set weight SW1 of the paving material that was scheduled to be used up to the current position shown in the design information. Furthermore, the planned weight estimation unit 50g calculates the estimated weight RW2 of the paving material that is estimated to be used on the road surface that is scheduled to be worked from the current position to the end of work from the calculated difference (e.g., weight ratio) and the set weight SW2 of the paving material that is scheduled to be used from the current position to the end of work shown in the design information. In this embodiment, the estimated weight RW2 of the paving material that is estimated to be actually used can be calculated by the following formula (1). Note that the calculation method is shown as an example, and other methods may be used.

RW2=SW2×(RW1/SW1)...(1)

The control correction unit 50h corrects the control of the screed 3 based on the average compaction degree for each specified area calculated by the compaction degree calculation unit 50c.

Conventionally, when spreading asphalt, the degree of compaction of the spread surface may vary depending on the operation of the asphalt finisher or changes in external conditions such as the mixture temperature. When such compaction occurs, it may affect the construction surface after compaction by the road roller. Therefore, the control correction unit 50h in this embodiment corrects the control of the screed 3 to suppress the degree of compaction.

For example, when the degree of compaction calculation unit 50c detects that an area in the direction of travel (X-axis direction) where the degree of compaction is lower than a predetermined range continues to occur, the control correction unit 50h performs control to increase the number of strikes by the tampers 25, 26 of the screed 3 corresponding to that area (increase the motor rotation speed). Also, when the degree of compaction calculation unit 50c detects that an area in the direction of travel (X-axis direction) where the degree of compaction is higher than a predetermined range continues to occur, the control correction unit 50h performs control to decrease the number of strikes by the tampers 25, 26 of the screed 3 corresponding to that area (reduce the motor rotation speed).

In addition, the control of the screed 3 is not limited to the tampers 25 and 26. For example, the control correction unit 50h may control the vibrators 27 and 28.

For example, when the degree of compaction calculation unit 50c detects that an area in which the degree of compaction is lower than a predetermined range continues in the direction of travel (X-axis direction), the control correction unit 50h performs control to increase the vibration frequency of the vibrators 27, 28 of the screed 3 corresponding to that area. Also, when the degree of compaction calculation unit 50c detects that an area in which the degree of compaction is higher than a predetermined range continues in the direction of travel (X-axis direction), the control correction unit 50h performs control to decrease the vibration frequency of the vibrators 27, 28 of the screed 3 corresponding to that area.

Furthermore, the control of the screed 3 may be performed by the control correction unit 50h adjusting the leveling height of the screed 3. In this embodiment, the control correction unit 50h controls the leveling arm 3A to move upward or downward as the leveling height of the screed 3. The leveling thickness can be increased by controlling the leveling arm 3A to rise, and the leveling thickness can be decreased by controlling the leveling arm 3A to fall.

For example, when the compaction degree calculation unit 50c detects that an area where the compaction degree is lower than a predetermined range continues to occur in the direction of travel (X-axis direction), the control correction unit 50h controls to increase the number of tampers 25, 26 of the screed 3 corresponding to the area, and controls to contract the leveling cylinder 23 and lower the leveling arm 3A. In this case, if the tampers 25, 26 are increased, the paving material becomes easier to enter the underside of the screed, and the leveling thickness increases, but the leveling thickness can be maintained by lowering the leveling arm 3A. This increases the amount of paving material to be spread on the road surface and increases the compaction degree. As a result, the leveling thickness can be kept constant even if the compaction degree is increased. In addition, the vibration frequency of the vibrators 27, 28 of the screed 3 corresponding to the area may be increased, and the leveling cylinder 23 may be contracted to raise the leveling arm 3A. In this case, if the vibration frequency of the vibrators 27, 28 of the screed 3 is increased, the pressing force of the screed bottom surface against the paving material increases, and the spread thickness decreases, but the spread thickness can be maintained by raising the leveling arm 3A. Furthermore, the control may be performed to increase the number of strikes of the tampers 25, 26 of the screed 3 corresponding to the area, and the vibration frequency of the vibrators 27, 28 may be increased. On the other hand, when the compaction degree calculation unit 50c determines that an area in which the compaction degree is higher than the predetermined range continues to occur in the direction of travel (X-axis direction), the control correction unit 50h controls to decrease the number of strikes of the tampers 25, 26 of the screed 3 corresponding to the area, and controls to extend the leveling cylinder 23 to raise the leveling arm 3A. In this case, if the tampers 25, 26 are decreased, the paving material becomes difficult to enter the underside of the screed, and the spread thickness also decreases, but the spread thickness can be maintained by raising the leveling arm 3A. This reduces the amount of paving material to be spread and the degree of compaction. As a result, the leveling thickness can be kept constant even if the degree of compaction is reduced. In addition, the vibration frequency of the vibrators 27, 28 of the screed 3 corresponding to the area may be reduced, and the leveling cylinder 23 may be contracted to lower the leveling arm 3A. In this case, if the vibration frequency of the vibrators 27, 28 of the screed 3 is reduced, the pressing force of the screed bottom surface against the paving material is reduced, and the leveling thickness increases, but the leveling thickness can be maintained by reducing the leveling arm 3A. In addition, the number of strikes by the tampers 25, 26 of the screed 3 corresponding to the area may be reduced, and the vibration frequency of the vibrators 27, 28 may be reduced.

In the example shown in Figure 4, the control correction unit 50h determines that in areas 721-724, there are areas in the direction of travel where the degree of compaction is lower than a predetermined range. Therefore, the control correction unit 50h performs a combination of control to increase the number of strikes by the tampers 25, 26, increase the vibration frequency of the vibrators 27, 28, and either raise or lower the leveling arm 3A. As a result, the road surface to be laid will have an increased degree of compaction and will be laid to a consistent thickness.

Returning to FIG. 3, the information generating unit 50j generates compaction information that associates the average compaction degree for each specified area calculated by the compaction degree calculation unit 50c (one aspect of the degree of the pavement material and voids) with location information (one example of location information) indicating the area where the average compaction degree was measured. The compaction information generated may include image information. Furthermore, the compaction information may include information indicating the time when the screed 3 laid the surface evenly for each specified area. The information generating unit 50j generates a distribution of the compaction degree of the laid road.

Possible location information (one example of location information) indicating the area where the average value of the compaction degree was measured is, for example, a combination of location information received from the GPS module 54 when the compaction degree was measured and relative location information from the GPS module 54 to the compaction degree measuring device 8 that measured the compaction degree. This makes it possible to identify the location information indicating the area where the compaction degree was measured as a position according to the World Geodetic System.

The information generating unit 50j then stores the generated compaction information in the memory unit 50l. The information generating unit 50j according to this embodiment stores the set values (including the set compaction degree) for each predetermined area indicated in the design information in association with the average value of the compaction degree measured in the area. This allows the results of construction by the asphalt finisher 100 to be managed in this embodiment.

The communication control unit 50i transmits and receives information between external devices.

For example, the communication control unit 50i transmits to the road roller 500, which will be described later, a rolling instruction based on the compaction information together with the compaction information generated by the information generating unit 50j. As another example, the communication control unit 50i may transmit to the road roller 500 a rolling instruction including a moving path for adjusting the degree of compaction of the road surface based on the compaction information generated by the information generating unit 50j. In addition, the communication control unit 50i transmits to the road roller 500 a degree of compaction associated with position information of the road surface (which may be position information indicating a specified area) based on the compaction information generated by the information generating unit 50j, and the road roller 500 may generate a moving path for controlling the compaction based on the degree of compaction associated with the received position information. Furthermore, the communication control unit 50i may transmit to the management device 400 a degree of compaction associated with position information of the road surface (for example, indicating a specified area) based on the compaction information generated by the information generating unit 50j. In this case, the management device 400 may generate a movement path for the road roller 500 to control the rolling based on the received degree of compaction, and then transmit it to the road roller 500. The rolling instruction transmitted to the road roller 500 may also include a required rolling force associated with the position information of the road surface.

Furthermore, when the estimated weight RW2 of the paving material calculated by the planned weight estimation unit 50g differs from the weight SW2 of the paving material indicated as planned to be used, the communication control unit 50i transmits an instruction to the management device 400 to adjust the amount of paving material to be supplied. The adjustment instruction is in accordance with the embodiment, and may be an instruction to adjust the amount to be supplied to the weight RW2 of the paving material predicted to actually be used.

The communication control unit 50i receives road roller compaction information (an example of the degree of road roller compaction) after the road roller 500 has compacted the road surface. The road roller compaction information includes a correspondence between a position indicating a predetermined area after the road roller 500 has compacted the road surface and an average value of the degree of compaction measured after compaction by the road roller 500.

The road roller compaction information may be information indicating an average value of the degree of compaction measured for each specified area by a compaction degree measuring device (not shown) provided on the road roller 500. In this case, the road roller compaction information is received from the road roller 500. The road roller compaction information may also include a rolling force associated with position information of the road surface.

The road roller compaction information may also be information showing the results measured by a compaction degree measuring device operated by a worker after compaction by the road roller 500. In this case, the communication control unit 50i receives the road roller compaction information from a communication device owned by the worker.

Based on the road roller compaction information and the compaction information, the information generating unit 50j generates construction management information (hereinafter referred to as a construction information management sheet) that shows information indicating the average value of the degree of compaction for each predetermined area spread and leveled by the asphalt finisher 100 and information indicating the average value of the degree of compaction for each predetermined area after compaction by the road roller 500. The construction information management sheet will be described later.

The display control unit 50k displays various information on the in-vehicle display device 52. For example, the display control unit 50k displays a construction information management sheet generated by the information generation unit 50j.

We will explain the construction management system (an example of a road surface paving system) of this embodiment. Figure 5 is a diagram showing an example of the configuration of the construction management system SYS related to this embodiment.

The construction management system SYS is mainly composed of an asphalt finisher 100, a dump truck 200, a plant 300, a management device 400, a road roller 500, and a portable information terminal 600.

The plant 300 is an example of a paving material production facility. In the example shown in FIG. 5, the plant 300 mainly includes a mixer 301, a trolley 302, and a hot silo 303.

Mixer 301 is a device for uniformly mixing aggregate, filler (stone powder), asphalt, etc. Trolley 302 is a device for transporting the mixture discharged from mixer 301 to hot silo 303. Hot silo 303 is a device for keeping warm and storing the mixture produced by mixer 301.

In addition, a controller 311, a spatial recognition device 312, and a communication device 313 are installed in the plant 300.

The controller 311 is a control device installed in the plant 300. The controller 311 is a computer including a CPU, a volatile storage device, and a non-volatile storage device, and is located in a building adjacent to the plant 300. For example, the controller 311 is realized by the CPU executing a program stored in the non-volatile storage device.

The communication device 313 is configured to control communication between the plant 300 and external devices. The communication device 313 controls wireless communication with the communication device 204 mounted on the dump truck 200. Furthermore, the communication device 313 controls wireless communication with the management device 400.

The controller 311 controls the movement of the mixer 301, the trolley 302, the hot silo 303, etc. Furthermore, the controller 311 manages the paving material produced in the plant 300.

In addition, the controller 311 recognizes the dump truck 200 based on information from the spatial recognition device 312.

The spatial recognition device 312 is configured to be able to monitor the state of the dump truck 200 in which paving material is being loaded in the plant 300. The spatial recognition device 312 is, for example, a monocular camera, a stereo camera, a millimeter wave radar, an ultrasonic sensor, a laser radar, or a LIDAR.

The spatial recognition device 312 may identify the dump truck 200 by recognizing characters displayed on the license plate based on the unevenness of the surface of the license plate of the dump truck 200. The controller 311 can use the spatial recognition device 312 to determine the position, shape, and type of the dump truck 200.

The controller 311 receives information regarding the supply of paving material to the dump truck 200 from the management device 400. For example, the controller 311 receives an instruction to change the amount of paving material to be used in construction from the management device 400. Then, based on the instruction, the controller 311 controls the supply of paving material to the dump truck 200 identified by the spatial recognition device 312.

The dump truck 200 is an example of a transport vehicle that transports paving material supplied into the hopper 2 of the asphalt finisher 100. The dump truck 200 is a dedicated dump truck for transporting paving material and is equipped with a movable bumper.

The dump truck 200 includes a cab 201 and a loading platform 202. The dump truck 200 is also provided with a controller 203 and a communication device 204 near the cab 201.

The controller 203 may transmit and receive information to and from the communication device 53 of the asphalt finisher 100 via the communication device 204. The controller 203 may also transmit and receive information to and from the communication device 313 of the plant 300 via the communication device 204.

The road roller 500 has a rolling roller 502 pivotally mounted to the front of the vehicle body 501, and an odometer 503 attached to the axle of the rolling roller 502. The road roller 500 reads the axle rotation speed of the rolling roller 502 using the odometer 503, and calculates the travel distance of the vehicle body 501 based on the axle rotation speed. The road roller 500 also has another rolling roller 504 pivotally mounted to the rear of the vehicle body 501.

The road roller 500 also includes a controller 511 in the driving operation unit 510. The road roller 500 also includes a GPS module 512 and a communication device 513.

The GPS module 512 is an example of a GNSS (Global Navigation Satellite System) module, and receives location information indicating the results of two-dimensional positioning by the GPS (Global Positioning System). The location information includes information indicating the position of the asphalt finisher 100 in latitude and longitude. Note that, although this embodiment uses GPS as a method for acquiring location information, the method for acquiring location information is not limited thereto, and other well-known methods may be used.

The communication device 513 controls wireless communication with the communication device 53 of the asphalt finisher 100. For example, the communication device 513 receives compaction information indicating the average compaction degree for each specified area of the road surface to be worked on from the communication device 53 of the asphalt finisher 100.

The controller 511 controls the movement of the vehicle body 12 to compact the road surface with the front and rear compaction rollers 502, 504. For example, the controller 511 of the embodiment may automatically control the compaction of the road surface. The controller 511 compacts the road surface to be worked on based on roller design information indicating the range to be compacted of the road surface and the position information of the road roller 500 received by the GPS module 512.

When the communication device 513 receives compaction information, the controller 511 compacts the road surface based on the received compaction information. For example, the controller 511 increases the number of compactions for areas where the degree of compaction is smaller than a predetermined range according to the compaction information, and reduces the number of compactions for areas where the degree of compaction is larger than the predetermined range. This allows adjustment of the degree of compaction. Adjustment of the degree of compaction may also be achieved by controlling the change in the rolling pressure.

The road roller 500 may be provided with a compaction meter (not shown) in the same manner as the asphalt finisher 100 described above. As with the asphalt finisher 100, it is conceivable that multiple compaction meters are provided in the vehicle width direction.

If the road roller 500 is equipped with a compaction degree measuring device, road roller compaction information indicating the average value of the compaction degree measured after construction for each specified area by the compaction degree measuring device may be transmitted to the asphalt finisher 100 via the communication device 513.

In addition, the road roller compaction information may be transmitted from the worker's communication device as the result of the worker measuring the compaction degree using a compaction measuring device after the road roller 500 has performed compaction.

Furthermore, this embodiment is not limited to a method in which the information generating unit 50j of the asphalt finisher 100 generates only compaction information as information to be transmitted to the road roller 500. For example, the information generating unit 50j may generate a travel route in which the number of times of compaction is varied at each point along the travel route based on the compaction information so as to suppress variations in the density of the paving material. The communication control unit 50i then transmits the generated travel route to the road roller 500. The road roller 500 performs steering control according to the received travel route. This makes it possible to suppress variations in the density of the paving material on the road surface.

Note that this embodiment does not limit the type of road roller 500, and the road roller 500 may be configured with multiple units including a tire roller. When multiple units are configured, any one of the multiple vehicles may perform the processing shown by the road roller 500 shown in this embodiment.

The portable information terminal 600 is, for example, a device carried by a worker riding on the tractor 1, a worker working around the asphalt finisher 100, or a manager of the construction site. The portable information terminal 600 may be attachable to a mounting bracket provided in the driver's seat 1S of the asphalt finisher 100. The portable information terminal 600 may be, for example, a portable device such as a tablet PC or a smartphone.

The portable information terminal 600 may display information received from the asphalt finisher 100 or the management device 400 (e.g., a construction information management sheet).

Assuming that the asphalt finisher 100 has the configuration described above, no further explanation will be given.

The controller 50 is also capable of transmitting and receiving information to and from other devices via the communication device 53. The controller 50 recognizes the area around the asphalt finisher 100 based on measurement information from the forward monitoring device 51F and the rear monitoring device 51B. Furthermore, the controller 50 performs various controls based on the degree of compaction of the paving material measured by the compaction measuring device 8.

In addition, the controller 50 transmits and receives information between the equipment that constitutes the construction management system SYS via the communication device 53.

For example, the controller 50 transmits an instruction to adjust the amount of paving material supplied to the management device 400 via the communication device 53.

As another example, the controller 50 transmits compaction information or a movement path to the road roller 500 via the communication device 53.

The controller 50 also receives road roller compaction information from the road roller 500 or the worker's communication device, which indicates the average degree of compaction for each specified area after the road roller 500 has compacted the soil. This causes the controller 50 to generate a construction information management sheet (see FIG. 8).

The controller 50 transmits the generated construction information management sheet to the management device 400.

The management device 400 performs overall control of the construction management system SYS according to this embodiment. For example, the management device 400 may be a computer including a CPU, a volatile storage device, and a non-volatile storage device, and may be a server having a communication unit capable of transmitting and receiving information via a network. The management device 400 also includes a storage device 401.

The management device 400 transmits and receives information to and from the asphalt finisher 100. For example, when the controller 50 determines that a discrepancy has occurred between the weight of paving material that is estimated to be actually used, as calculated by the asphalt finisher 100, and the weight of the paving material planned to be used as indicated in the design information, the management device 400 receives an instruction from the asphalt finisher 100 to adjust the amount of paving material supplied.

The management device 400 transmits an instruction to change the amount of paving material to be used in construction to the communication device 313 of the plant 300. This enables the management device 400 to adjust the amount of paving material supplied to the asphalt finisher 100.

When a construction information management sheet is transmitted from the asphalt finisher 100, the management device 400 stores the construction information management sheet in the storage device 401. The manager thereby manages the construction information.

Furthermore, the management device 400 may transmit the received construction information management sheet to the portable information terminal 600. This allows the worker to refer to the construction information management sheet and check the detailed construction results.

In addition, this embodiment is not limited to a method in which the management device 400 transmits the construction information management sheet to the portable information terminal 600. The communication device 53 of the asphalt finisher 100 may transmit the construction information management sheet to the portable information terminal 600.

Figure 6 shows an asphalt finisher 100, a dump truck 200, and a road roller 500, which are examples of road machinery according to this embodiment. Specifically, 800A is a left side view, and 800B is a top view. Figure 6 shows an example of the dump truck 200 approaching the asphalt finisher 100 while reversing.

As shown in 800A, the dump truck 200 is in contact with the asphalt finisher 100 from the traveling direction (positive direction of the +X axis). The dump truck 200 supplies paving material to the hopper 2 of the asphalt finisher 100.

The controller 50 of the asphalt finisher 100 according to this embodiment transmits a control command to the communication device 204 of the dump truck 200 via the communication device 53. The controller 203 of the dump truck 200 performs control according to the control command. The control command includes, for example, a control command for steering the loading platform 202 of the dump truck 200 to position the loading platform 202 at a specified position of the asphalt finisher 100. Other control commands include, for example, a control command for instructing the dump truck 200 to reverse or stop in order to bring the rear wheels of the dump truck 200 into contact with the rollers 2b.

The controller 50 of the asphalt finisher 100 in this embodiment transmits compaction information to the communication device 513 of the road roller 500 via the communication device 53 during construction.

The controller 511 of the road roller 500 performs rolling control of the road surface according to the compaction information for each predetermined area. The compaction information indicates the degree of compaction of the paving material for each predetermined area. The controller 511 of the road roller 500 identifies the current position using the GPS module 512, and then performs control such as varying the number of rolling operations based on the average value of the compaction degree of the predetermined area including the current position. In this embodiment, the width of the compaction degree measuring device 8 of the asphalt finisher 100 is different from the width of the road roller 500. Therefore, the controller 511 performs rolling control taking the width into consideration. For example, the average value of the compaction degree for each area indicated by the width of the road roller 500 may be recalculated, and rolling control may be performed based on the results of the recalculation.

The controller 511 of the road roller 500 may also receive the travel path instead of the compaction information. The controller 511 can perform steering control according to the travel path, thereby realizing rolling control that takes into account the degree of compaction for each specified area.

Figure 7 is a diagram showing the condition of the road surface on which construction is performed by the asphalt finisher 100 according to this embodiment. In the example shown in Figure 7, the road surface to be constructed includes a first straight section SC1, a widening section SC2, and a second straight section SC3. The widening section SC2 also includes a bus stop section SC4 surrounded by a dashed line.

The design information includes the road width W1 and length L1 of the first straight section SC1, the road width W1+W2 and length L2+L3 of the widening section SC2 including the road width W2 of the bus stop section SC4, and the road width W3 and length L4 of the second straight section SC3. The design information also includes the lengths L11 and L12 of the sections in the widening section SC2 where the road width changes. Furthermore, the design information includes the set thickness. In this way, the controller 50 according to this embodiment can specify the preset volume for each section based on the design information. This allows the controller 50 to specify the set weight of the paving material to be used for each section. This embodiment is not limited to the method of calculating the set weight of the paving material to be used for each section, and the design information may include the set volume and set weight for each section.

For example, when the asphalt finisher 100 of this embodiment reaches the end position 100A of the first straight section SC1, the weight calculation unit 50f of the controller 50 of the asphalt finisher 100 calculates the weight of the paving material actually used in the first straight section SC1 based on the volume of the first straight section SC1.

The planned weight estimation unit 50g of the controller 50 determines whether there is a difference between the weight of the paving material used in the first straight section SC1 calculated by the weight calculation unit 50f and the set weight of the paving material planned to be used in the first straight section SC1 indicated in the design information. If it is determined that there is a difference, the planned weight estimation unit 50g calculates the estimated weight of the paving material that is predicted to actually be used in the widening section SC2 and the second straight section SC3. The calculation method is as described above, so explanation is omitted.

When the estimated weight estimation unit 50g determines that there is a difference between the set weight indicated in the setting information and the estimated weight calculated by the estimated weight estimation unit 50g, the communication control unit 50i transmits to the management device 400 an instruction to change the weight of the paving material to be supplied to the widening section SC2 and the second straight section SC3 that are estimated to be actually used by the estimated weight estimation unit 50g. This makes it possible to prevent deviations in the paving material supplied during construction.

In addition, when the control correction unit 50h performs control to adjust the degree of compaction of the paving material to be laid, the planned weight estimation unit 50g may take into account the adjustment results and calculate an estimated weight of the paving material that is expected to actually be used on the road surface that is to be paved (for example, the widening section SC2 and the second straight section SC3).

In addition, the dashed dotted line G2 indicates the position where the second dump truck 200 starts supplying paving material, the dashed dotted line G3 indicates the position where the third dump truck 200 starts supplying paving material, and the dashed dotted line G4 indicates the position where the fourth dump truck 200 starts supplying paving material.

When a difference occurs between the set weight of the paving material indicated in the setting information by the planned weight estimation unit 50g and the estimated weight of the paving material actually used, the communication control unit 50i may transmit an instruction to the management device 400 to change the position at which the supply of the paving material starts for each dump truck 200. In this way, the management device 400 instructs the dump truck 200 to change the destination point on the road surface.

As described above, the information generation unit 50j of the controller 50 of the asphalt finisher 100 in this embodiment generates a construction information management sheet that shows, for each specified area assigned to each compaction measuring instrument 8, the average compaction degree stored in the memory unit 50l (measured by the compaction measuring instrument 8) and the average compaction degree after construction in the memory unit 50l.

Figure 8 is a diagram illustrating a construction information management sheet generated by the information generation unit 50j according to this embodiment. As shown in Figure 8, the construction information management sheet includes, as basic information, the construction date and time, the construction location, and the model number of the construction machine (asphalt finisher 100). In addition, as construction conditions, construction distance and construction width are included. Furthermore, as setting information and setting conditions, the average set thickness, average measured thickness, average set void ratio, average measured void ratio, set paving material volume, and actual paving material volume used are included.

The average set thickness, average set void ratio, and set pavement material volume are information derived from the design information described above. The average measured thickness, average measured void ratio, and actual pavement material volume used are information measured after construction by the asphalt finisher 100.

The information generation unit 50j processes the measured information and text information based on the design information for each of the above items. This reduces the burden on the worker.

Furthermore, the construction information management sheet shows a column (AF measurement result column) 861 showing information indicating the average value of the degree of compaction for each specified area spread and leveled by the asphalt finisher 100, and a column (road roller measurement result column) 862 showing the average value of the degree of compaction for each specified area after compaction by the road roller 500. The AF measurement result column and the road roller measurement result column could show, for example, road surface information for 200 m. In other words, multiple construction information management sheets may be generated according to the distance of construction.

The AF measurement result field 861 displays information showing the degree of compaction for each specified area indicated by the compaction information. Specifically, the AF measurement result field 861 displays areas 811-814 where the degree of compaction is lower than the specified range. The AF measurement result field 861 also displays areas 821 and 822 where the degree of compaction is higher than the specified range. The AF measurement result field 861 also displays the time (including the start time and end time) when the screed 3 was laid down for each specified area.

The road roller measurement result field 862 displays information showing the degree of compaction for each specified area indicated in the road roller compaction information received from the road roller 500. Specifically, the road roller measurement result field 862 shows areas 851, 852 where the degree of compaction after compaction by the road roller 500 is higher than the specified range. In the road roller measurement result field 862, areas 831 to 834 show that the degree of compaction by the road roller 500 fell within the specified range.

In this way, by checking the construction information management sheet, the worker can compare the construction results of the asphalt finisher 100 with the compaction results of the road roller 500. In the example shown in Figure 8, the compaction results of the road roller 500 reduce areas where the degree of compaction is below a predetermined range, so it can be confirmed that the quality of the asphalt has improved.

Note that the construction information management sheet shown in this embodiment is shown as an example, and other forms may be used. For example, the construction information management sheet may not include the road roller measurement result column 862. Furthermore, each item shown in the construction information management sheet is shown as an example, and other items may be included, for example.

The information generating unit 50j according to the present embodiment may generate a construction information management sheet as image information that is visible to humans. Furthermore, the information generating unit 50j according to the present embodiment may generate a construction information management sheet as document information that can be read by a specific application.

In this embodiment, the information generating unit 50j generates the above-mentioned construction information management sheet (an example of construction management information), thereby reducing the burden on the worker of creating documents. In addition, the construction information management sheet shows the results of processing by the asphalt finisher 100 and the road roller 500 for each specified area. This makes it possible to generate a construction information management sheet that makes it easier to grasp the construction status compared to when the worker creates it manually.

The information generating unit 50j stores the generated construction information management sheet in the memory unit 50l. The communication control unit 50i transmits the construction information management sheet generated by the information generating unit 50j to the management device 400.

The management device 400 stores the received construction information management sheet in the storage device 401. This enables the management device 400 to manage the construction results.

This embodiment is not limited to the method in which the asphalt finisher 100 generates the construction information management sheet. For example, the asphalt finisher 100 may transmit compaction information, etc. to the management device 400, and the management device 400 may generate the construction information management sheet.

In this embodiment, an example has been described in which the asphalt finisher 100 generates compaction information based on information measured by the compaction measuring instrument 8. However, this embodiment is not limited to a method in which the compaction information is generated by the asphalt finisher 100. For example, the controller 50 of the asphalt finisher 100 may transmit a signal received from the compaction measuring instrument 8 and location information acquired from the GPS module 54 to the management device 400 via the communication device 53, and the management device 400 may generate the compaction information. In this case, the management device 400 transmits the compaction information or a movement route generated based on the compaction information to the road roller 500.

In this way, all processing performed by the controller 50 described above (e.g., calculating the difference between the weight of the paving material actually used and the set weight indicated in the design information) may be performed by the management device 400.

In the above-described embodiment, the asphalt finisher 100 has the above-described configuration and can calculate the average compaction degree of the paving material for each predetermined area of the road surface. This allows various controls to be realized to improve the quality of the road surface. For example, the asphalt finisher 100 controls the screed 3 to adjust the compaction degree, thereby improving the quality of the road surface. Furthermore, the asphalt finisher 100 transmits compaction information or the movement path to the road roller 500, and the road roller 500 can adjust the compaction degree of the paving material based on the received compaction information or the movement path. This allows the quality of the road surface to be improved.

Furthermore, the weight of the paving material actually used can be calculated based on the compaction information measured by the compaction degree measuring device 8. This allows the controller 50 to send an instruction to the management device 400 to change the weight of the paving material supplied to the asphalt finisher 100. This makes it possible to prevent shortages and surpluses of paving material being supplied, thereby realizing cost reductions.

According to one aspect of the present disclosure, the control of the screed device is corrected based on the degree of compaction to prevent variations in the density of the laid paving material.

According to one aspect of the present disclosure, the density of paving material spread evenly on a road surface is measured, and the position is associated with the measurement results and managed, making it possible to respond according to the density of the spread evenly on the road surface.

According to one aspect of the present disclosure, the burden on workers is reduced by generating construction management information indicating the degree of compaction measured at each location where the asphalt finisher has laid and leveled the paving material.

Although the above describes an embodiment of an asphalt finisher and a construction management system (one example of a road surface paving system), the present invention is not limited to the above embodiment. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. Naturally, these also fall within the technical scope of the present invention.

This application claims priority to Japanese Patent Application No. 2021-062375, Japanese Patent Application No. 2021-062381, Japanese Patent Application No. 2021-062382, and Japanese Patent Application No. 2021-062390, filed on March 31, 2021, the entire contents of which are incorporated by reference into this application.

100...Asphalt finisher 50...Controller 50a...Acquisition unit 50b...Thickness calculation unit 50c...Compactness calculation unit 50d...Volume calculation unit 50f...Weight calculation unit 50g...Scheduled weight estimation unit 50h...Control correction unit 50i...Communication control unit 50j...Information generation unit 50k...Display control unit 50l...Memory unit 8_1 to 8_6...Compactness measuring device 54...GPS module 51F...Front monitoring device 51B...Rear monitoring device 52...In-vehicle display device 53...Communication device 400...Management device 401...Memory device 500...Road roller 511...Controller 512...GPS module 513...Communication device 600...Portable information terminal

Claims (12)

A tractor,
A hopper installed in front of the tractor;
a conveyor for conveying the paving material in the hopper to the rear side of the tractor;
A screw that spreads the paving material transported by the conveyor and scattered on the road surface in a vehicle width direction;
A screed device that spreads the paving material spread by the screw on the rear side of the screw;
A measuring device for measuring the degree of compaction , which is the ratio of the pavement material spread evenly on the road surface to voids ,
Calculate the weight of the paving material spread on the finished road surface based on the degree of compaction, the thickness of the paving material spread, the construction width of the finished road surface on which the paving material has been spread, and the distance of the finished road surface on which the paving material has been spread;
When there is a difference between the weight of the paving material spread on the already-paved road surface and the set weight of the paving material that was set as intended for use on the already-paved road surface, an estimated weight of the paving material that is expected to be used on the road surface to be constructed is calculated based on the difference and the set weight of the paving material that was set as intended for use on the road surface to be constructed;
Asphalt finisher. a communication device for transmitting information to the management device;
transmitting the estimated weight of the paving material to the management device via the communication device;
An asphalt finisher as claimed in claim 1 . The measuring device is provided in plurality in the width direction of the asphalt finisher,
An asphalt finisher as claimed in claim 1. Correcting control of the screed device based on the degree of compaction.
An asphalt finisher as claimed in claim 1. Correcting control of the screed device corresponding to the position where the compaction degree is measured among the plurality of screed devices;
An asphalt finisher as claimed in claim 4 . The method further includes a control device that associates the position where the pavement material is spread and the degree of compaction measured by the measuring device.
An asphalt finisher as claimed in claim 1. The control device transmits instructions based on the position where the pavement material has been spread and the degree of compaction measured by the measuring device to a road roller that rolls the road surface after it has been spread and leveled by the screed device.
An asphalt finisher as claimed in claim 6 . The instruction based on the position and the degree of compaction is an instruction to vary the number of times the road surface is compacted based on the degree of compaction.
An asphalt finisher as claimed in claim 7 . receiving road roller compaction information that associates the position of the road surface with the degree of compaction, which is the ratio of the pavement material to voids after compaction by the road roller;
An asphalt finisher as claimed in claim 7 . The degree of compaction measured at each position where the paving material is laid is generated as construction management information that is visually recognizable by a human.
An asphalt finisher as claimed in claim 1. Receive a road roller compaction degree, which indicates the degree of the pavement material and voids, measured for each position on the road surface after the road roller has laid the pavement material, from the road roller that rolls the road surface after the pavement material has been laid, and
generating the construction management information based on the degree of road roller compaction, the construction management information further including the degree of the pavement material and the degree of voids measured for each position on the road surface after the road roller has been compacted;
An asphalt finisher as claimed in claim 10 . an asphalt finisher comprising: a tractor, a hopper installed in front of the tractor, a conveyor for transporting paving material in the hopper to the rear of the tractor, a screw for spreading the paving material transported by the conveyor and scattered on a road surface in the vehicle width direction, a screed device for spreading the paving material spread by the screw behind the screw, a measuring device for measuring a degree of compaction indicating the ratio of the paving material spread and leveled on the road surface to voids, and a communication device for transmitting information;
a management device for receiving the information;
The asphalt finisher includes:
Calculate the weight of the paving material spread on the finished road surface based on the degree of compaction, the thickness of the paving material spread, the construction width of the finished road surface on which the paving material has been spread, and the distance of the finished road surface on which the paving material has been spread;
If there is a difference between the weight of the paving material spread on the already-paved road surface and the set weight of the paving material that was set as intended for use on the already-paved road surface, an estimated weight of the paving material that is expected to be used on the road surface to be constructed is calculated based on the difference and the set weight of the paving material that was set as intended for use on the road surface to be constructed;
transmitting the estimated weight of the paving material to the management device via the communication device;
Road surface paving system.

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