JP3980322B2 - Method and apparatus for controlling floor thickness in multi-layer simultaneous pavement - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention has at least two screeds for the upper layer and the lower layer.Multi-layer pavement equipmentWith regard to the control of the floor thickness in the multi-layer simultaneous pavement method in which the upper and lower two layers are paved in one pavement process, in particular, between the upper layer screed and the lower layer screed.Flat surfaceThe floor thickness is managed by managing the height difference.Floor thickness controlMethod andThatRelates to the device.
[0002]
[Prior art]
When laying the base layer and the surface layer in one pavement process (that is, one pass), or when constructing the surface layer consisting of multiple layers in one pass, a laying machine dedicated to multi-layer simultaneous pavement equipped with multiple screeds Is often used (Japanese Utility Model Publication No. 46-7061).
In this case, after the lower layer is spread with the lower layer screed, the upper layer pavement material is supplied to the upper surface of the spread surface, and spread over the entire construction surface with a spreader or the like. Pavement is performed by pressing with an upper layer screed.
[0003]
At this time, the spread thickness immediately after the lower layer screed (that is, the spread thickness of the lower layer) and the spread thickness immediately after the upper layer screed (that is, the spread thickness that combines the lower layer and the upper layer) The thickness of the upper layer was calculated based on the difference between the measured values, and the position of each screed was adjusted so that the floor thickness would be a predetermined value. .
[0004]
In addition, a wire or the like is stretched on the base line that is a standard for measuring the pavement height, and the difference in the height of each screed with respect to the wire or the like is detected by a mechanical or ultrasonic height detection sensor. Based on the result, a method is also employed in which the average thickness of the upper layer is calculated, and the height of each screed is adjusted so that the average thickness is as designed.
[0005]
[Problems to be solved by the invention]
However, in the method of directly measuring the spread thickness with a thickness gauge or the like, the lower layer screed is close to the upper layer screed, and the upper layer pavement material is supplied to the lower layer surface immediately after the spread. The measurement was difficult, and the work was difficult.
In addition, the measurement work is usually performed behind the screed and outside the construction surface (that is, the road surface that is not paved), but during laying work, traffic is often restricted on one side and the opposite lane. It was dangerous because it would be a situation where the measurement was performed in the immediate vicinity of the vehicle passing by.
[0006]
In addition, since the floor thickness of the upper layer is calculated based on the floor thickness measured at different points on the construction surface (i.e., the front and rear points of the upper layer screed), the exact floor thickness is calculated. There was also the inconvenience that cannot be detected. In this way, in the situation where the exact floor thickness of the upper layer cannot be detected, the floor thickness must be increased more than necessary, and expensive pavement materials are often used for the upper layer. The material cost was inevitably increased.
[0007]
On the other hand, the latter method of measuring the position of the screed with reference to the wire etc. requires a tensioning work of the wire etc. and also subtracts the measured values of both screeds to lay the upper layer. It was cumbersome because the thickness was detected.
Therefore, in the paving work for paving multiple layers at the same time, by making it possible to easily grasp the accurate average thickness of the upper layer, the loss of the upper layer paving material is reduced and the material cost is reduced, The purpose is to improve the finished shape of the pavement despite the complicated pavement design or the poor construction environment.
[0008]
[Means for solving the problems]
  In order to solve the above-described problem, the spread thickness control method according to claim 1 is a method of simultaneously piling two or more layers in one pavement process using at least two screeds for an upper layer and a lower layer. In pavement,A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; ofDetect the difference in the height of the floor,Of the two screedsEitherNoCreed, saidFlat surfaceThe position is adjusted so that the height difference becomes a predetermined value.
[0009]
  In the multi-layer simultaneous pavement in which the pavement thickness control method according to claim 2 performs pavement of upper and lower two layers in one pavement process using at least two screeds for the upper layer and the lower layer,A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; One ofOne of the screedThe average surface from the baselineDetecting the height, detecting a difference in height between the two screeds, adjusting the position of the one screed to a predetermined height,Of the two screedsThe other screedFlat surfaceThe position is adjusted so that the height difference becomes a predetermined value.
[0010]
  In the multi-layer simultaneous paving apparatus capable of performing upper and lower two-layer paving in one paving process using at least two screeds for the upper layer and the lower layer,A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; ofDetecting the difference in floor heightHeight differenceDetection means;Either one of the two screeds,SaidFlat surfaceAdjust the position so that the height difference becomes a predetermined valueHeight differenceAnd adjusting means.
[0011]
  The multi-layer simultaneous pavement apparatus that can perform pavement of upper and lower two layers in one pavement process using at least two screeds for the upper layer and for the lower layer,A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; One ofOne of the screedThe average surface from the baselineHeight detection means for detecting the height, height difference detection means for detecting the difference in height between the two screeds, and height adjustment for adjusting the position of the one screed to a predetermined height Means and saidOf the two screedsThe other screedFlat surfaceAnd a height difference adjusting means for adjusting the position so that the height difference becomes a predetermined value.
[0012]
[Action and effect of the invention]
  The floor thickness control method according to claim 1 is:A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; ofDetect difference in floor heightOf the two screedsOne of the screeds, So that the difference in height of the spread surface becomes a predetermined valueAdjust the position. Thereby, the floor thickness of the upper layer is managed.
[0013]
  According to the present invention,Only one of the lower layer screed and the upper layer screed can be adjusted in position to accurately set the spread thickness of the upper layer.This makes the upper layer thicker than necessary.thingReduce material costsCan be planned.Further, since the difference in height between the two screed floors is detected and the height difference is directly fed back to one of the screeds to adjust the position, the position of the screed can be adjusted quickly.
[0014]
  The floor thickness control method according to claim 2 is:A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of moving up and down, and an upper layer screed pulled by a pair of leveling arms extending rearward from both side surfaces of the vehicle body to be movable up and down; Of one of the screedFrom baselineFlat surfaceDetect heightAnd saidThe difference in height between the two screed floors is detected and the one screed is moved to a predetermined height.PositionAdjustOf the two screedsThe other screed,SaidFlat surfaceOf heightThe position is adjusted so that the difference becomes a predetermined value.
[0015]
When the lower layer from the upper floor is regarded as the floor thickness, when managing both the upper floor height and the upper floor thickness, the height of the upper screed from the baseline is detected. The spread surface of the upper layer screed is adjusted so as to be positioned at the target height (that is, the spread height of the upper layer). In this way, the surface (that is, the upper surface floor surface) that serves as a measurement standard for the floor surface thickness is managed. Thereafter, the position of the lower screed is adjusted so that the difference in height between the two screed floors becomes a predetermined value.
[0016]
On the other hand, when the rise from the lower floor is taken as the upper floor thickness, and when managing both the lower floor height and the upper floor thickness, the height of the lower layer screed from the baseline should be First, the leveling surface of the lower screed is adjusted so as to be positioned at the target height. In this way, the surface (that is, the lower surface layer surface) that serves as a measurement standard for the surface layer thickness is managed. Thereafter, the position of the upper-layer screed is adjusted so that the difference in height between the two screed floors becomes a predetermined value.
[0017]
  in this way,Detecting the height of the spread surface from the base line for only one of the lower layer screed or the upper layer screed, adjusting the position of the one screed to a predetermined height, adjusting the position of only the other screed, and By setting the height difference between the two screeds to a predetermined value, both the height of the upper floor and the floor thickness of the upper layer are accurately set from the baseline. be able to. Thereby, the upper layer is not made thicker than necessary, and the material cost can be reduced. Also,It becomes possible to easily cope with a complicated pavement design in which the spread thickness varies depending on the construction site and the spread height varies depending on the construction site. Also, the pavement accuracy can be increased even in a poor construction environment where the vertical movement of the vehicle body is intense and the screed position changes greatly.
[0018]
  The floor thickness control device according to claim 3 is:By means of height difference detection means, it is pulled up and down by a screed for the lower layer arranged through a mounting frame at the rear of the vehicle body and capable of moving up and down, and a pair of leveling arms extending backward from both sides of the vehicle body. With the upper screed made possibleDetect the difference in the height of the floor,By means of height difference adjustment means, either one of the two screeds is brought into contact with the spread surface.The difference in height is a predetermined valuePositionAdjust the position.
  According to the present invention,Only one of the lower layer screed and the upper layer screed can be adjusted in position to accurately set the spread thickness of the upper layer. Thereby, the upper layer is not made thicker than necessary, and the material cost can be reduced. Also, the difference in height between the two screed floors is detected, and the height difference is directly fed back to one of the screeds to adjust the position.The position can be adjusted quickly. This makes the upper layer thicker than necessary.thingThe material cost can be reduced.
[0019]
  The floor thickness control device according to claim 4 is a height detection means,A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; Of the floor from the baseline of one of the screedDetect heightShiBy the height difference detection means,SaidDetects the difference in height between the two screed floorsShiThe one screed by the height adjusting meansThePredetermined heightPositionBy adjusting the position and adjusting the height difference,Of the two screeds, the other screed isThe position is adjusted so that the difference in the height of the spread surface becomes a predetermined value.
[0020]
  According to the floor thickness control device,Detecting the height of the spread surface from the base line for only one of the lower layer screed or the upper layer screed, adjusting the position of the one screed to a predetermined height, adjusting the position of only the other screed, and By setting the height difference between the two screed floors to a predetermined value,The height of the floorUpper layerBoth floor thicknessIs set correctlybe able to. ThisThe upper layer is not made thicker than necessary, and the material cost can be reduced. Also, the spread thickness varies depending on the construction site, and the spread height varies depending on the construction site.In addition to being able to easily cope with complicated pavement designs, pavement accuracy can be increased even in a poor construction environment.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
  As shown in FIG.Multi-layer pavement equipment1 includes a floor thickness control device 100 according to the first embodiment of the present invention, and a lower body hopper device 10 and an upper layer hopper device mounted on a vehicle body 4 having a traveling means 2 and various operation devices 3. 20, a lower layer spreader 30, a lower layer screed 40, an upper layer spreader 50, and an upper layer screed 60 are arranged in this order from the front in the traveling direction A.
[0022]
The lower layer hopper device 10 includes a lower layer hopper 11 that stores the lower layer pavement material, and a bar feeder 12 that extends from below the hopper discharge port to the rear end of the vehicle body. The material is stored, the paving material is conveyed backward by the bar feeder 12 and discharged onto the construction surface.
The upper layer hopper device 20 includes an upper layer hopper 21 disposed behind the lower layer hopper 11, and a screw conveyor 22 extending from below the hopper discharge port to the rear of the lower layer screed 40. Then, the pavement material for the upper layer is stored, the pavement material is conveyed rearward by the screw conveyor 22, and is discharged to the lower layer surface immediately after the spreading through the discharge chute 23 at the rear end.
[0023]
A lower layer spreader 30, a lower layer screed 40, and an upper layer spreader 50 are disposed behind the vehicle body 4 via the attachment frame 5.
The lower layer spreader 30 has a screw having a main shaft extending in the construction width direction, and conveys the pavement material discharged from the bar feeder 12 in the left-right direction with respect to the traveling direction.
[0024]
The lower layer screed 40 is attached via drawbars 41 provided on both sides of the attachment frame 5 immediately after the lower layer spreader 30, and presses the pavement material spread on the construction surface by its load. It is a configuration. The draw bar 41 can be expanded and contracted, and the lower layer screed 40 is moved up and down by the expansion and contraction.
The screed body stores a pair of left and right extension parts 42 that can be extended in the construction width direction. By adjusting the extension amount of the extension part 42 from the screed body, the screed width corresponds to the construction width. be able to.
[0025]
Similarly to the lower layer spreader 30, the upper layer spreader 50 also has a screw whose main shaft extends in the construction width direction, and conveys the pavement material discharged from the discharge chute 23 by the screw in the lateral direction of the traveling direction.
These devices 30, 40 and 50 can be lifted and lowered integrally by a hydraulic jack (not shown) attached to the frame.
[0026]
The upper-layer screed 60 disposed behind the upper-layer spreader 50 is pulled by a pair of leveling arms 61 extending rearward from the center of both side surfaces of the vehicle body, and the spread pavement material is used. It is the structure pressed by the load. Similarly to the lower screed 40, the upper screed 60 has a pair of left and right extension parts 62 that can be stored in the screed body, and is moved up and down by a hydraulic cylinder 63 disposed between the vehicle body 4 and the base end of the leveling arm 61. Is done. In this case, when the hydraulic cylinder 63 is extended and the base end portion of the leveling arm 61 is lowered, the rear end portion is raised with the suspended portion of the leveling arm 61 as a fulcrum, and the position of the upper layer screed 60 is raised. is there.
[0027]
As shown in FIG. 2, an L-shaped bracket 64 protrudes forward in the direction of travel in each extension portion 62 of the upper layer screed 60, and a columnar support 65 is provided on the O-shaped frame portion at the end of the bracket. It is inserted and fixed at a predetermined position. A height detection sensor 110 described later is disposed at the lower end of the columnar support 65.
[0028]
  An L-shaped bracket 66 is also provided on the upper surface of the screed main body of the upper layer screed 60 so as to protrude forward in the traveling direction, and at the lower end portion of the columnar support 67 inserted and fixed to the O-shaped frame portion at the end of the bracket. A height difference detection sensor 120, which will be described later, is provided.
  Of the above configurationMulti-layer pavement equipmentAs shown in FIG. 3, the floor thickness control apparatus 100 mounted on 1 includes the height detection sensor 110 as a height detection means and the height difference detection sensor as a height difference detection means. 120, a height adjusting means 130 including the hydraulic cylinder 63, a height difference adjusting means 140 built in the draw bar 41, a control panel 150, a position adjusting controller 160, and a display means 170. And comprising.
[0029]
  As shown in FIG. 4, the height detection sensor 110 attached to the extension 62 of the upper layer screed 60 via a bracket 64 and a columnar support 65 penetrates the measurement shaft 112 in the lateral direction of the box 111. The arm 113 is pivotally attached to the measuring shaft 112, the follower plate 114 is rotatably attached to the tip of the arm 113, and the rotation angle of the arm 113 associated with the follower of the follower plate 114 to the base line BL is set. This is a configuration in which continuous measurement is performed by a potentiometer or the like provided inside the box 111. Since the rotation angle of the arm 113 is related to the position variation of the upper layer screed 60 with respect to the base line BL, the upper layer screed is measured from the base line by measuring the rotation angle.60 floorsCan be detected.
[0030]
In this case, the position of the arm 113 corresponding to a predetermined target height of the upper layer screed 60 is used as a reference (that is, 0 °), and the rotation angle relative to the position is measured, whereby the actual height and target of the upper layer screed 60 are measured. The deviation from the height was detected.
On the other hand, the height difference detection sensor 120 attached to the upper surface of the screed main body of the upper layer screed 60 via the bracket 66 and the columnar support 67 also has a measurement shaft 122 on the side surface of the box 121, similarly to the height detection sensor 110. The tracking plate 124 is rotatably attached to the tip of the arm, and the rotation angle of the arm 123 accompanying the tracking of the tracking plate 124 to the upper surface of the extension portion is boxed. Measure continuously with an internal potentiometer. Since the rotation angle of the arm 123 is related to the change in the difference in height between the upper layer screed 60 and the lower layer screed 40, the height of the spread surface of each screed 40, 60 is measured by measuring this rotation angle. The difference in height can be detected.
[0031]
The height adjusting means 130 moves the upper screed 60 up and down, and is a hydraulic circuit including a hydraulic cylinder 63 provided at the base end portion of the leveling arm and a hydraulic unit for extending and contracting it. The electromagnetic valve interposed in the hydraulic circuit is operated based on the electrical signal (that is, the height information D1) output from the height detection sensor 110, thereby driving the height adjusting means 130.
[0032]
The height difference adjusting means 140 moves the lower screed 40 up and down by expanding and contracting the draw bar 41 and is, for example, a rotary hydraulic jack. The height difference adjusting means 140 is driven based on an electric control signal (that is, height difference information D2) output from the height difference detection sensor 120.
The control panel 150 disposed in the vicinity of the driver's seat as a part of the operation device 3 includes a control mode setting unit 151 and a threshold setting unit 152.
[0033]
The control mode setting unit 151 selects between the automatic control mode and the manual control mode. When the automatic control mode is selected, threshold information D3 and D4 are input via the threshold setting unit 152. The position adjustment controller 160 is activated. The threshold information D3 and D4 indicate the allowable range of error between the design floor height and design floor thickness (ie, target value) and the actual value. The smaller the absolute value, the higher the accuracy. High pavement is realized.
[0034]
When manual control is selected, the operator makes a process determination similar to that of the position adjustment controller 160 and drives the height adjustment means 130 and the height difference adjustment means 140 by remote operation or direct operation. .
As shown in FIG. 3, the position adjustment controller 160, based on various information input from the control panel 150, the height detection sensor 110, and the height difference detection sensor 120, The height adjustment unit 140 is driven, and a height information input unit 161 to which height information D1 (that is, information indicating a height deviation) output from the height detection sensor 110 is input; Height difference information input unit 162 to which height difference information D2 (that is, information indicating deviation in height difference) output from difference detection sensor 120 is input, and threshold information D3 and D4 of these deviations. Is input to the threshold value information input unit 163, the height comparison unit 164 that compares the height deviation with the threshold value, and the height adjustment information D5 is output to the height adjustment unit 130 based on this comparison. Height adjustment information output unit 16 And a height difference comparison unit 166 that compares the height difference deviation with a threshold value, and a height that outputs height difference adjustment information D6 to the height difference adjustment means 140 based on this comparison. A difference adjustment information output unit 167 of the computer.
[0035]
The display means 170 displays the electrical signals from both sensors 110 and 120 as numerical information. This display means 170 is always driven when the manual control mode is selected.
A method for controlling the spread average thickness in the multi-layer simultaneous pavement using the spread thickness control apparatus 100 having the above configuration will be described with reference to FIGS. 3 and 5. In this case, as a pavement design, as shown in FIG. 6, when the target floor average height H and the target floor average thickness W are constant in all construction sites, the target floor average height as shown in FIG. When H is constant and the target floor thicknesses W1, W2, and W3 vary depending on the construction site, the target floor thickness W is constant and the target floor heights H1, H2, and H2 are as shown in FIG. When H3 differs depending on the construction site, as shown in FIG. 9, there are four modes in which the target floor thickness W1, W2, W3 and the target floor height H1, H2, H3 are different in the construction site. However, for convenience, a pavement control method in which the target floor average height H and the target floor average thickness W in FIG. 6 are constant in all construction sites will be described.
[0036]
In advance, the control panel 150 selects the automatic control mode or the manual control mode (S1).
In the spreading step, information indicating the height deviation and the height difference deviation is output from the height detection sensor 110 and the height difference detection sensor 120, respectively (S2, S3). It is determined whether the control mode or the manual control mode (S4), and when the automatic control mode is selected, the electrical signals from the height detection sensor 110 and the height difference detection sensor 120 are binary signals. The height information D1 and the height difference information D2 are respectively input to the position adjustment controller 160 (S5). On the other hand, when the manual control mode is selected, it is converted into numerical information and output to the display means 170 ( S6).
[0037]
  In the position controller 160, first, the height information D1 (that is, the height deviation) input via the height information input unit 161 and the threshold information input unit.163Is compared with the threshold value D3 input via the height comparison unit 164 (S7). If it is within the threshold range, the process proceeds to the next step (S8). The height adjustment information D5 is output via the height adjustment information output unit 165 (S9).
[0038]
The height adjustment information D5 is input to the height adjustment means 130, and the solenoid valve of the hydraulic circuit is operated in a direction in which the height deviation is eliminated (S10).
As a result, the hydraulic cylinder 63 is expanded and contracted, and the upper layer screed 60 is raised and lowered in a direction approaching the target spread height (S11).
Based on the position-adjusted upper screed 60, the height deviation from the base line BL and the height difference deviation from the lower layer screed 40 are detected again (S2, S3).
[0039]
When the height deviation is within the threshold range, or when the height deviation is within the threshold range by position adjustment, the height difference information D2 input via the height difference information input unit 162 and the threshold information The threshold value D4 input through the input unit 163 is compared (S8). If it is within the threshold range, the spread thickness control is terminated. If it is outside the threshold range, the height difference adjustment information D6 is output via the height difference adjustment information output unit 167 (S12). .
[0040]
  The height difference adjustment information D6 is input to the height difference adjustment means 140, and the draw bar 41 is expanded or contracted in a direction in which the deviation in height difference is eliminated (that is, the direction in which the height difference approaches the target value). (S13), screed for lower layer40Is raised and lowered (S14).
  Based on the position-adjusted lower screed 40, the upper screed 60 andFlat surfaceThe deviation of the height difference is detected again (S3), and when the deviation falls within the threshold range, the control of the spread thickness is terminated.
[0041]
  In this way, the positions of both screeds 40, 60 are adjusted and the floor height and floor thickness are maintained within the design range.
  In this embodiment, first, the screed for the upper layer60After adjusting the position of the screed for the lower layer40Therefore, for example, it is suitable for the management of the average thickness of the upper layer when the height management of the finished surface is particularly important. In addition, since it is configured to detect the suitability of the upper layer spread thickness based on the difference in height between the two screeds, it is possible to detect the spread spread thickness accurately even with an apparatus having a simple structure. Therefore, since it is not necessary to make the upper layer thicker than necessary, the material cost can be reduced.
[0042]
  In addition, as in the case of FIGS. 7 to 8, when it is desired to change the spread height and spread thickness depending on the construction site,Multi-layer pavement equipmentWhen 1 reaches the construction site, the target value is reset.
  In this case, for example, as shown in FIG. 10, the control panel 150 is provided with a target height setting unit 153 and a target height difference setting unit 154 so that the operator can set the target value at any time during the spreading step. You may keep it. The detection sensors 110 and 120 calculate the deviation between the target value and the measured value based on the target value that is input as needed, and output the height information D1 or the height difference information D2. 125 may be included.
[0043]
Further, the position adjustment controller 160 may be separated into an upper layer screed controller 180 and a lower layer screed controller 190. In this case, the setting of the control mode of the upper layer screed 60 and the setting of the control mode of the lower layer screed 40 can be performed independently, and the control mode information set by the setting units 155 and 156 in the control panel 150 is added. Based on this, the mode determination units 116 and 126 in the respective sensors 110 and 120 determine the output destinations of the height information D1 and the height difference information D2 (that is, 170 or 180, 170 or 190). Also good.
[0044]
In this way, the position of one screed can be adjusted manually, and the other screed can be automatically adjusted by the computer.
The position adjusting means 130 and 140 for raising and lowering the screed may have any configuration as long as the screed can be raised and lowered, and even a manual jack or the like is operated by remote operation. Alternatively, it may be automatically operated by a computer.
[0045]
Further, the height detection sensor 110 and the height difference detection sensor 120 are not limited to the above configuration, and may be, for example, a non-contact type measurement device.
Further, the height detection sensor 110 and the upper screed controller 180 may be integrated, or the height difference detection sensor 120 and the lower screed controller 190 may be integrated.
[0046]
  or,Multi-layer pavement equipmentFor example, 1 may have three or more screeds, and one screed may be fixed to the other screed. In this case, since one of the screeds follows up and down of the other screed while maintaining the height difference, the processing of S12 to S14 is substantially performed in the case where the upper layer spread thickness should be constant. Is no longer necessary.
[0047]
  The floor thickness control apparatus 200 according to the second embodiment of the present invention shown in FIG. 11 is the first embodiment in that a height detection sensor 210 and a height difference detection sensor 220 are attached to the lower screed 40. Pertaining toMulti-layer pavement equipment 1Is different.
  That is, two L-shaped brackets 43 and 44 are attached to the upper surface of the screed body of the lower layer screed 40, and the columnar supports 45 and 46 are inserted and fixed to the O-shaped frame at the end of the bracket, respectively. A height detection sensor 210 and a height difference detection sensor 220 are provided in each part.
[0048]
Similar to the sensor of the first embodiment, each of the sensors 210 and 220 has a measurement shaft penetrating the side of the box on one side in the traveling direction, and is attached to the distal end portion of the arms 213 and 223 attached to the measurement shaft. The follower plates 214 and 224 are rotatably attached, and the rotation angles of the arms 213 and 223 accompanying the displacement of the follower plates 214 and 224 are continuously detected by a potentiometer or the like inside the box.
[0049]
  The follower plate 214 of the height detection sensor 210 follows the base line BL, and the follower plate 224 of the height difference detection sensor 220 follows the upper surface of the screed body of the upper layer screed 60.
  The height adjusting means 230 is a screed for the lower layer.40This is a device that allows the drawbar 41 to expand and contract. On the other hand, the height difference adjusting means 240 moves the upper end screed 60 up and down by moving the rear end of the leveling arm 61 up and down.
[0050]
The driving of the position adjusting means 230 and 240 may be performed directly or remotely by an operator, or may be automatically controlled by the position adjusting controller 250. The processing in the position adjustment controller 250 is the same as in the first embodiment.
A method of controlling the spread average thickness in the multi-layer simultaneous pavement using the spread thickness control apparatus 200 having the above configuration will be described with reference to FIG.
[0051]
In advance, the control panel 150 selects the automatic control mode or the manual control mode (S1). When the automatic control mode is selected, in the spreading step, the electrical signals output from the height detection sensor 210 and the height difference detection sensor 220 are adjusted as height information D1 and height difference information D2. Each is output to the controller 250 (S2, S3, S4, S5). In this case, the height information D1 output from the height detection sensor 210 is a deviation between the height of the lower screed 40 from the baseline and the target height.
[0052]
The controller 250 first compares the input height information D1 with the threshold value D3 (S7), and if it is outside the threshold range, outputs the height adjustment information D5 to the height adjustment means 230 (S9). Thereby, the draw bar 41 is expanded and contracted (S10), and the lower screed 40 is moved up and down (S11). Based on the raised lower screed 40, the height deviation from the base line BL and the height difference from the upper screed 60 are detected again, and the height deviation falls within the threshold D3. When it becomes, the height difference information D2 and the threshold value D4 are compared (S8).
[0053]
  If the height difference information D2 is within the range of the threshold value D4, the spread thickness control is terminated. If the height difference information D2 is outside the range, the height difference adjustment information D6 is output to the height difference adjustment means 240. (S12).
  As a result, the hydraulic cylinder 63 between the vehicle body 4 and the leveling arm 61 is expanded and contracted (S13), and the upper screed 60 is moved up and down (S14). And based on the screed 60 for the upper layer whose position has been adjusted, the screed 40 for the lower layerFlat surfaceIf the deviation of the height difference is detected again and the deviation is within the threshold range, the control of the spread thickness is terminated.
[0054]
According to this embodiment, the spread thickness of the upper layer is measured using the surface spread by the lower screed 40 as a reference.
The floor thickness control device 300 according to the third embodiment of the present invention shown in FIG. 13 includes a height difference detection sensor 320, a position adjustment means 330, a control panel 350, a position adjustment controller 360, and a display means. 370, and is different from the spread thickness control apparatus according to the first and second embodiments in that there is no height detection sensor and one position adjusting means.
[0055]
  The height difference detection sensor 320 is obtained by measuring the upper layer screed 60 and the lower layer screed 40 measured by the measuring instrument.Flat surfaceBased on the difference in height and the difference in target height input from the control panel 350, these deviations are detected by computer processing and output as height difference information D2.
  The control panel 350 is provided with means 351 for setting a target height difference and means 352 for selecting a control mode. The height difference detection sensor 320 is configured to detect a height difference according to the selected control mode. The information D2 is output to the position adjustment controller 360 or the display means 370.
[0056]
The position adjustment controller 360 outputs position adjustment information D5 to the position adjustment means 330 based on the height difference information D2, and the display means 370 displays the height difference information D2 on a monitor.
The position adjustment means 330 is an actuator for raising and lowering one of the screeds (60 or 40). In the automatic control mode, the position adjustment means 330 operates based on the position adjustment information D5 output from the position adjustment controller 360. In the manual control mode, the operator operates while looking at the display means 370.
[0057]
  A method for controlling the spread average thickness in the multiple-layer simultaneous pavement using the spread average thickness control apparatus 300 will be described with reference to FIG.
  In advance, the control panel 350 sets the target height difference and selects the control mode (S1).
  When the automatic control mode is selected, the electrical signal detected by the height difference detection sensor 320 is input to the controller 360 as height difference information D2 (S2, S3), and a preset threshold value D4. When the deviation from the target height difference is determined to be outside the threshold range, position adjustment information D5 is output to the position adjustment means 330 (S5). As a result, the position adjusting means is driven (S6), and one of the screeds is moved up and down (S7). After the screed is raised and lowered againFlat surfaceThe deviation of the height difference is detected, and when it falls within the threshold range, the control of the spread thickness is terminated.
[0058]
According to the present embodiment, the spread height cannot be managed, but the spread thickness of the upper layer can be managed with an apparatus having a simple structure.
[Brief description of the drawings]
FIG. 1 shows the installation of a floor thickness control device according to a first embodiment of the present invention.Multi-layer pavement apparatus(A) is the front view seen from the advancing direction side, (b) is the top view.
FIG. 2 shows the floor thickness control apparatus, (a) is the aboveMulti-layer pavement equipment(B) is the partial front view.
FIG. 3 is a block diagram showing the floor spread thickness control device.
FIG. 4 is a perspective view showing a height detection sensor of the floor thickness control device.
FIG. 5 is a flowchart showing a spread thickness control method performed using the spread thickness control apparatus.
FIG. 6 is a cross-sectional view showing a pavement state managed by the spread thickness control method.
FIG. 7 is a cross-sectional view of a pavement layer that is a modified form of the pavement state and is designed so that the spread height is constant and the spread thickness varies depending on the construction site.
FIG. 8 is a cross-sectional view of a pavement layer that is a modified form of the pavement state and is designed such that the spread thickness is constant and the spread height is different depending on the construction site.
FIG. 9 is a cross-sectional view of a pavement layer that is a modified form of the pavement state and is designed such that the spread height and spread thickness are different depending on the construction site.
FIG. 10 is a block diagram showing a modification of the spread thickness control device.
FIG. 11 shows a spread thickness control apparatus according to a second embodiment of the present invention, in which (a) is mounted.Multi-layer pavement equipment(B) is the partial front view.
FIG. 12 is a flowchart showing a spread thickness control method performed using the spread thickness control apparatus.
FIG. 13 is a block diagram showing a spread thickness control apparatus according to a third embodiment of the present invention.
FIG. 14 is a flowchart showing a spread thickness control method performed using the spread thickness control apparatus.
[Explanation of symbols]
  1 ...Multi-layer pavement equipment
  5 ... Mounting frame
  40 ... Screed for lower layer
  60 ... Screed for upper layer
  61 ... Leveling arm
  100, 200, 300 ... floor thickness control device
  110, 210 ... Height detection sensor
  120, 220, 320 ... Height difference detection sensor
  130, 230 ... Height adjustment means
  140, 240 ... Height difference adjusting means

Claims (4)

In multi-layer simultaneous pavement, in which two layers of upper and lower layers are paved in one pavement process using at least two screeds for upper layer and lower layer,
A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; of detecting the difference in height ShikiHitoshimen,
Wherein either one of the scan Creed of the two screed, the difference in height of the ShikiHitoshimen is located adjusted to a predetermined value,
A floor thickness control method characterized by that. In multi-layer simultaneous pavement, in which two layers of upper and lower layers are paved in one pavement process using at least two screeds for upper layer and lower layer,
A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered; and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; The height of the spread surface from the baseline of one of the screed is detected,
Detecting the difference in height between the two screed floors,
Adjust the position of the one screed to a predetermined height,
Adjusting the position of the other screed of the two screeds so that the difference in height of the spread surface becomes a predetermined value;
Laying HitoshiAtsushi of controlling how to characterized in that. In a multi-layer simultaneous pavement apparatus that can perform pavement of upper and lower two layers in one pavement process using at least two screeds for upper layer and lower layer,
A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; A height difference detecting means for detecting a difference in height of the spread surface of the floor,
A height difference adjusting means for adjusting the position of any one of the two screeds so that the height difference of the spread surface becomes a predetermined value;
A floor thickness control apparatus comprising: In a multi-layer simultaneous pavement apparatus that can perform pavement of upper and lower two layers in one pavement process using at least two screeds for upper layer and lower layer,
A lower layer screed disposed through a mounting frame at the rear of the vehicle body and capable of being raised and lowered, and an upper layer screed that is pulled up and down by a pair of leveling arms extending rearward from both side surfaces of the vehicle body; a height detecting means for detecting the height of ShikiHitoshimen from one of screed baseline of,
A height difference detecting means for detecting a difference in height between the two screed floors;
A height adjusting means for adjusting the position of the one screed to a predetermined height;
A height difference adjusting means for adjusting the position of the other screed of the two screeds so that the height difference of the spread surface becomes a predetermined value;
A floor thickness control apparatus comprising:

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