JP2012251375A - Finisher and method for constructing surface layer body - Google Patents

Abstract

It is an object of the present invention to provide a finisher and a surface layer construction method capable of reliably performing construction with a simple configuration when paving material is newly laid on a previously laid paving material.
A screed 4 and a height adjusting device 8 for adjusting the height of the screed 4 are provided, and a new paving material having a predetermined thickness is formed on a paving material S1 previously laid on a roadbed R. The height adjusting device 8 is fixed to the side portion of the screed 4, the rotating body 22 that rotates on the surface of the roadbed R as the finisher 1 moves, and the screed 4. And a height adjusting unit capable of adjusting the relative height position between the rotating body 22 and the rotating body 22, and the rotating body 22 is made of a disc, and a part of the paving material S1 is preliminarily laid. It is characterized by rotating while turning.
[Selection] Figure 4

Description

  The present invention relates to a finisher used for constructing a surface layer body in a pavement structure and a method for constructing the surface layer body.

  For example, the dirt course of Baba is composed of a roadbed and a surface layer that is spread on the roadbed with a predetermined thickness. The surface layer body is made of a pavement material made of cushion sand or rubber chips having a small particle diameter, and is laid on the roadbed using a finisher. A conventional finisher mainly includes a vehicle main body, a hopper for storing pavement material, a screed for spreading the pavement material, and a connecting arm for connecting the vehicle main body and the screed. The connecting arm is connected to the vehicle main body via a hinge, and the screed is movable up and down with respect to the vehicle main body.

  For example, when using asphalt as the surface layer body, the screed receives buoyancy from the asphalt by adjusting the supply amount of asphalt and the running speed of the vehicle body of the finisher. As a result, the screed can maintain a constant height, and the thickness of the surface layer body is adjusted. However, when cushion sand is used as the paving material, the screed cannot receive buoyancy from the paving material, and the screed sinks in the paving material. Therefore, when cushion sand is used as a paving material, a long wooden frame is installed along the dirt course on the roadbed, and the thickness of the surface layer body is adjusted by the screed sliding on the wooden frame. It was.

  Further, for example, in the conventional surface layer construction method, as described in Patent Document 1, a finisher including a height sensor for detecting the height from the roadbed to the screed and a cylinder for moving the connecting arm up and down. Based on the data detected by the height sensor, the thickness of the surface layer body was adjusted by moving the connecting arm up and down with the cylinder.

  Here, the surface layer body of Baba is regularly maintained because the pavement material of the roadbed and the surface layer body is damaged by the hoof of the horse or the pavement material is washed away by wind and rain. In this maintenance, the surface layer body is once removed to repair a damaged part or a weak part of the roadbed, and then the cleaned pavement material is spread and leveled.

  Since the dirt course has a circumference of about 1000 to 2000 m and a width of 30 to 40 m, it takes many days to level the paving material with a certain thickness on the roadbed. For this reason, in the conventional construction method, since the exposed roadbed hurts when it rains during the construction, the roadbed has to be repaired again, resulting in prolonged work. Therefore, in order to prevent such a problem, a primary leveling process in which the pavement material is roughened with a thickness smaller than the planned pavement thickness, and a new pavement material on the pavement material previously laid in the primary leveling process. It is conceivable to carry out a secondary leveling process to level the floor to the planned pavement thickness. In this primary leveling process, since the pavement material is quickly laid by roughening, all the roadbed can be covered with the pavement material in a short time, and the roadbed can be protected.

Utility Model Registration No. 2504898

  However, it is not easy to spread a new pavement material on a pre-laid pavement material. For example, even if a wooden frame is provided on a paving material laid in advance, the screed cannot be maintained at a constant height because the wooden frame sinks into the paving material. On the other hand, if a finisher is provided with a height sensor, a cylinder, or the like, there is a problem that the cost of the finisher increases and the construction cost increases.

  The present invention has been made to solve such a problem, and a finisher capable of reliably performing construction with a simple configuration when a new paving material is spread on a paving material previously laid, and It aims at providing the construction method of a surface layer body.

  In order to solve such a problem, the present invention has a screed and a height adjusting device fixed to a side portion of the screed, and has a predetermined thickness on a paving material previously laid on a roadbed. A finisher for newly spreading and paving the paving material, the height adjusting device comprising: a rotating body that rotates on a surface of the roadbed as the finisher moves; and a relative relationship between the screed and the rotating body. A height adjusting unit capable of adjusting a general height position, and the rotating body is made of a disk, and a part of the rotating body rotates while passing through the pre-laid pavement material. Features.

  According to such a configuration, the rotating body of the height adjusting device can be rotated on the surface of the roadbed while making the rotating body pass through the paving material previously laid by making the disk into a disk. Moreover, the height position from the roadbed to the screed can be adjusted by the height adjusting unit. Thereby, a new surface layer material can be surely spread and leveled from the roadbed with a predetermined thickness without sinking the screed into the pavement material previously laid.

  Moreover, it is preferable that the said rotary body is comprised with the some disc mutually spaced apart. According to this configuration, it is possible to disperse the load acting on the roadbed while making the rotating body easy to crawl, so that the roadbed can be prevented from being recessed by the rotating body.

  Moreover, it is preferable that a through-hole penetrating in the plate thickness direction is formed in the rotating body. Since the rotating body rotates in the paving material laid in advance, the screed may move in the width direction when a large load is applied from the paving material during movement. However, according to such a configuration, since the paving material laid in advance moves in the plate thickness direction of the rotating body through the through hole, the load applied to the rotating body from the paving material laid in advance can be reduced.

  Moreover, it is preferable that the leveling member for leveling the wrinkles formed by the said rotary body on the surface of the paving material previously laid is formed in the back side of the advancing direction of the said rotary body. According to such a configuration, it is possible to avoid the formation of wrinkles on the paving material laid in advance by the rotating body.

  The auxiliary height adjusting device is fixed to a side portion of the screed, and the auxiliary height adjusting device is provided on the surface of the roadbed or on the pre-paved pavement material as the finisher moves. A rotating body that rotates on the surface of the paving material leveled, and a height adjusting unit that can adjust a height position of the rotating body of the auxiliary height adjusting device with respect to the screed, and the auxiliary height It is preferable that the rotating body of the height adjusting device is constituted by a cylindrical drum. According to this configuration, the height of the screed can be stabilized without denting the pavement material spread on the roadbed or the pavement material previously laid.

  Further, the present invention provides a primary leveling step for leveling the pavement material with a thickness smaller than the planned pavement thickness on the roadbed, and a pavement material preliminarily laid in the primary leveling step by the primary leveling step. The finisher comprises a height adjusting device fixed to the side of the screed, and a secondary leveling step of spreading a new paving material with a predetermined thickness. The height adjusting device includes: a rotating body that rotates on the surface of the roadbed as the finisher moves; and a height adjusting unit that can adjust a relative height position of the screed and the rotating body. The rotating body is formed of a disk, and in the secondary leveling step, the rotating body is rotated while the part of the rotating body is covered with the pavement material laid in advance. To do.

  According to such a method, the rotating body of the height adjusting device can be rotated on the surface of the roadbed while making the rotating body pass through the pavement material laid in advance by making a disk. Moreover, the height position from the roadbed to the screed can be adjusted by the height adjusting unit. Thereby, even if the pavement material is laid in advance, a new surface layer material can be surely laid out with a predetermined thickness from the roadbed.

  According to the finisher and the surface layer construction method according to the present invention, when a paving material is newly laid on a paving material laid in advance, the construction can be reliably performed with a simple configuration.

It is a figure which shows the finisher which concerns on this embodiment, Comprising: (a) is a side view, (b) is a rear view. It is a figure which shows the height adjustment apparatus which concerns on this embodiment, Comprising: (a) is a perspective view, (b) is a front view. It is a figure which shows the auxiliary | assistant height adjustment apparatus which concerns on this embodiment, Comprising: (a) is a perspective view, (b) is a front view. It is a model rear view which shows the construction method of the surface layer body which concerns on this embodiment in steps. It is a schematic side view which shows the modification of a height adjustment apparatus.

  Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1A and 1B, the finisher 1 according to the present embodiment includes a vehicle body 2, a hopper 3, a screed 4, a connecting arm 5, a crawler portion 6, and a driver's seat 7. The height adjusting device 8 and the auxiliary height adjusting device 9 are mainly configured. The finisher 1 is a device that presses the pavement material so as to have a predetermined thickness and spreads it flat. The up, down, left, and right directions in the description follow the arrows in the figure.

  The vehicle body 2 is a device that includes an engine therein and supports each component. The hopper 3 is a device that is installed on the front side of the vehicle body 2 and stores pavement material. The screed 4 is installed on the rear side of the vehicle body 2 and is a device that presses the pavement material supplied from the hopper 3 to the roadbed R and spreads it to a predetermined thickness.

  A pair of connecting arms 5 are installed on both the left and right sides of the vehicle body 2 and are connected to the vehicle body 2 via hinges. The connecting arm 5 has a front side connected to the vehicle body 2 and a rear side connected to the screed 4. Thereby, the screed 4 is movable in the vertical direction with respect to the vehicle body 2.

  A pair of crawler portions 6 is installed on both the left and right sides of the vehicle body 2. The crawler unit 6 is an endless track that can be easily traveled on rough terrain. The driver's seat 7 is installed in the upper part of the vehicle body 2.

  The height adjusting device 8 is made of metal and is fixed to one side of the screed 4 (left side in FIG. 1B). The height adjusting device 8 is a device that adjusts the height of the screed 4. As shown in FIG. 2, the height adjusting device 8 is mainly composed of a frame portion 11 and a wheel portion 12.

  The frame portion 11 includes an inner plate 13, an outer plate 14, and an upper plate 15. The inner plate 13 is a plate disposed on the screed 4 side. At the four corners of the inner plate 13, elongated holes 13a extending in the vertical direction are formed. The long hole 13 a is screwed to the mounting boss T formed on the screed 4 by a bolt B. By providing the long hole 13a, the height position of the height adjusting device 8 with respect to the screed 4 can be adjusted. The elongated hole 13a and the bolt B constitute a “height adjusting portion” in the claims.

  The outer plate 14 is spaced apart from the inner plate 13 and is provided in parallel with the inner plate 13. The upper plate 15 is a plate that connects the inner plate 13 and the outer plate 14.

  The wheel unit 12 includes a rotating shaft 21, a rotating body 22, and a bearing 23. The rotating body 22 is a disc and is provided on the rotating shaft 21 so as to be separated from each other. In the present embodiment, three rotating bodies 22 are provided. The rotating body 22 has a plurality of through holes 12a penetrating in the plate thickness direction. The bearings 23 are respectively provided on the inner plate 13 and the outer plate 14 and support the rotating shaft 21 in a rotatable manner.

  As shown in FIG. 2 (b), the rotating body 22 moves along the pavement material S1 laid in advance (hereinafter also referred to as “lower layer portion S1”) as the vehicle body 2 moves. Rotate up. Although three rotating bodies 22 are used in the present embodiment, one rotating body 22 may be used as long as it can rotate on the roadbed R while passing through the lower layer portion S1 and the roadbed S cannot be recessed. Further, the rotating body 22 may be two, or four or more. The thickness of the rotating body 22 is set to such an extent that the rotating body 22 contacts the roadbed R when the rotating body 22 rotates in the lower layer portion S1. At least one through hole 12a may be provided, but a plurality of through holes 12a are preferably provided at equal intervals in the circumferential direction.

  The auxiliary height adjusting device 9 is made of metal, and is fixed to the other side of the screed 4 (the right side in FIG. 1B). The auxiliary height adjusting device 9 is a device that adjusts the height of the screed 4. As shown in FIG. 3, the auxiliary height adjusting device 9 includes a frame portion 31 and a wheel portion 32.

  The frame portion 31 includes an inner plate 33, an outer plate 34, and an upper plate 35. The inner plate 33 is a plate disposed on the screed 4 side. At the four corners of the inner plate 33, elongated holes 33a extending in the vertical direction are formed. The long hole 33 a is screwed to the mounting boss T formed on the screed 4 by a bolt B. By providing the long hole 33a, the relative height position between the screed 4 and the auxiliary height adjusting device 9 can be adjusted. The elongated hole 33a and the bolt B constitute a “height adjusting portion” in the claims.

  The outer plate 34 is spaced apart from the inner plate 33 and is provided in parallel with the inner plate 33. The upper plate 35 is a plate that connects the inner plate 33 and the outer plate 34.

  The wheel portion 32 includes a rotating shaft 41, a rotating body 42, and a bearing 43. The rotating body 42 is an iron wheel having a cylindrical shape. The bearings 43 are provided on the inner plate 33 and the outer plate 34, respectively, and rotatably support the rotating shaft 41.

  The rotating body 42 rotates on the surface of the roadbed R as shown in FIG. Further, as described later, the rotating body 42 rotates on the surface of the pavement material spread on the lower layer part S1 as the vehicle body 2 moves. The width of the rotating body 42 in the left-right direction is set so that the roadbed R and the leveled pavement material do not dent or the dent becomes small.

  The height adjusting device 8 and the auxiliary height adjusting device 9 are provided one by one on the side of the screed 4 in FIG. 1, but are not limited to this. Depending on the construction stage of the surface layer body, for example, a pair of height adjusting devices 8 may be provided on both sides of the screed 4, or a pair of auxiliary height adjusting devices 9 may be provided on both sides of the screed 4.

  Next, the construction method of the surface layer body according to the present embodiment will be described. Although a construction place and pavement material are not specifically limited, For example, the case where the surface layer body of a dirt course of Baba is constructed is illustrated. Moreover, the pavement material illustrates the case where a mixture of cushion sand and rubber chips is used. In the surface layer construction method according to the present embodiment, as shown in FIG. 4, a primary leveling step of laying the lower layer portion S <b> 1 of the surface layer body, and a secondary of newly paving the paving material on the lower layer portion S <b> 1. Leveling process. The pavement material spread on the lower layer S1 is also referred to as “upper layer”.

  In the primary leveling step, as shown in FIG. 4A, the lower layer S1 is laid on the roadbed R by leveling the pavement material with a thickness smaller than the planned pavement thickness. For example, when the planned pavement thickness is 83 mm, the pavement material is laid at a thickness of 30 mm in the primary leveling process. In the primary leveling process, the roadbed R is covered with a pavement material to prevent the roadbed R from being exposed. In the primary leveling process, it is preferable to work with an emphasis on speed using a machine such as a motor grader.

  In the secondary leveling step, a pavement material is newly spread on the lower layer portion S1, and the upper layer portion of the surface layer body is laid. Since the width of the Baba dirt course is larger than the width of the screed 4, in the secondary leveling process, once the finisher 1 is made to circulate in the extending direction of the dirt course and the upper layer of one lane is laid, Then, the finisher 1 is run along the lane, and the laying work is performed in order for each lane.

  Specifically, in the secondary leveling step according to the present embodiment, the first upper layer portion leveling step for spreading the first upper layer portion S2 of the surface layer body, and the second upper layer portion S2 ′ of the surface layer body for spreading and leveling. A second upper layer portion leveling step and a third upper layer portion leveling step for spreading and leveling the third upper layer portion S2 '' of the surface layer body are performed. In the secondary leveling step, the pavement material is compacted while being heated by the screed 4 and the total thickness of the spread and leveled surface body is set to 83 mm.

  In the first upper layer leveling step, a pair of height adjusting devices 8 are fixed on both sides of the screed 4 as shown in FIG. At this time, the height adjusting device 8 with respect to the screed 4 is adjusted so that the height from the lower end of the rotating body 22 to the lower end of the screed 4 (iron portion for pressing and heating the pavement material) is 83 mm which is a planned pavement thickness. Adjust the height position. A finisher having a pair of height adjusting devices 8 fixed on both sides of the screed 4 is referred to as a finisher 1A.

  In the first upper layer leveling step, the paving material is newly leveled while running the finisher 1A on the lower layer S1 laid in advance. The rotating body 22 of the height adjusting device 8 rotates on the roadbed R while entering the lower layer portion S1. Thereby, as shown in FIG. 4B, the first upper layer portion S2 in which the paving material is newly spread with a predetermined thickness is laid on the lower layer portion S1.

  In the second upper layer leveling step, as shown in FIG. 4C, the auxiliary height adjusting device 9 is fixed to the first upper layer portion S2 side of the screed 4, and the height adjusting device on the opposite side. 8 is fixed. At this time, the height position of the height adjusting device 8 with respect to the screed 4 is adjusted so that the height from the lower end of the rotating body 22 to the lower end of the screed 4 is 83 mm which is the planned pavement thickness.

  Further, the lower end of the screed 4 and the lower end of the rotating body 42 of the auxiliary height adjusting device 9 are adjusted so as to have the same height. A finisher in which the height adjusting device 8 is fixed to one of the screeds 4 and the auxiliary height adjusting device 9 is fixed to the other is called a finisher 1B.

  In the second upper layer leveling step, the paving material is newly leveled while running the finisher 1B on the lower layer S1 leveled in advance and adjacent to the first upper layer S2. At this time, the rotating body 22 of the height adjusting device 8 rotates on the roadbed R while entering the lower layer portion S1 laid in advance. On the other hand, the rotating body 42 of the auxiliary height adjusting device 9 rotates on the first upper layer portion S2 that has already been spread. Thereby, as shown in FIG. 4C, the second upper layer on which the pavement material is newly spread with a predetermined thickness on the lower layer portion S1 and adjacent to the first upper layer portion S2. Part S2 ′ is laid.

  In the third upper layer portion leveling step, as shown in FIG. 4D, the auxiliary height adjusting device 9 is fixed to the second upper layer portion S2 ′ side of the screed 4, and the auxiliary height is opposite to the second upper layer portion S2 ′. The adjusting device 9 'is fixed. At this time, the height position of the auxiliary height adjusting device 9 ′ with respect to the screed 4 is adjusted so that the height from the lower end of the rotating body 42 to the lower end of the screed 4 is 83 mm which is the planned pavement thickness.

  Further, the lower end of the screed 4 and the lower end of the rotating body 42 of the auxiliary height adjusting device 9 are adjusted so as to have the same height. A finisher having auxiliary height adjusting devices 9, 9 'fixed on both sides of the screed 4 is referred to as finisher 1C.

  Then, in the third upper layer leveling step, the paving material is newly leveled while running the finisher 1C on the lower level portion S1 leveled beforehand and adjacent to the second upper level portion S2 '. At this time, the rotating body 42 of the auxiliary height adjusting device 9 ′ rotates on the roadbed R. On the other hand, the rotating body 42 of the auxiliary height adjusting device 9 rotates on the second upper layer portion S2 '. As a result, as shown in FIG. 4 (d), the pavement material is newly spread with a predetermined thickness on the lower layer portion S1 and adjacent to the second upper layer portion S2 ′. Upper layer part S2 '' is laid. Thus, the surface layer body laid by the planned pavement thickness is laid by repeating the upper layer leveling step in order over the width direction of the dirt course.

  According to the finisher 1 and the surface layer body construction method described above, the rotating body 22 of the height adjusting device 8 is made into a disk so that the rotating body 22 is moved to the lower layer portion S1 previously laid, and the roadbed R Can be rotated on the surface. Further, the height position from the roadbed R to the screed 4 can be adjusted by the height adjusting portion (the long hole 13a, the bolt B) of the height adjusting device 8. Thereby, the new pavement material can be surely spread from the roadbed R with a predetermined thickness without sinking the screed 4 in the lower layer portion S1. Moreover, since the height adjusting device 8 has a simple configuration, it can be manufactured at low cost. Moreover, since it only fixes to the screed 4 with the volt | bolt B, attachment / detachment can also be made easy.

  Moreover, since the rotary body 22 is comprised with several discs mutually spaced apart, the load which acts on the roadbed R can be disperse | distributed. Thereby, it is possible to prevent the roadbed R from being recessed by the rotating body 22.

  Moreover, since the through-hole 22a penetrating in the plate thickness direction is formed in the rotating body 22, the paving material can flow in the plate thickness direction of the rotating body 22. Thereby, since the load concerning the rotary body 22 from lower layer part S1 can be made small, the height adjustment apparatus 8 and the screed 4 can be moved straight.

  Further, when the lower layer part S1 is present on both sides of the screed 4, according to the finisher 1A shown in FIG. 4 (b), the screed 4 is provided with the height adjusting devices 8 on both sides, so that the screed 4 does not tilt. Stable paving material can be leveled.

  Further, when there is a lower layer part S1 on one side of the screed 4 and a paving material (first upper layer part S2) spread on the other side, according to the finisher 1B shown in FIG. By providing the height adjusting device 8 on the other side and providing the auxiliary height adjusting device 9 on the other side, the pavement material can be laid and leveled stably without the screed 4 being inclined. Moreover, since the rotary body 42 of the auxiliary height adjusting device 9 is cylindrical, it can be avoided that the existing first upper layer part S2 is recessed.

  Further, when there is a roadbed R on one side of the screed 4 and there is a paving material (second upper layer portion S2 ′) spread on the other side, according to the finisher 1C shown in FIG. By providing the auxiliary height adjusting devices 9 and 9 ′ on both sides, the paving material can be spread and leveled stably without the screed 4 being inclined. Moreover, since the rotary body 42 of the auxiliary height adjusting device 9 is cylindrical, it is possible to avoid the formation of a recess in the existing second upper layer portion S2 '.

  In addition, if it is a tire type finisher, it may be difficult to travel on the lower layer part S1, and the construction period may become long. However, construction is possible by using the crawler type finisher 1 as in this embodiment. The period can be greatly shortened.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, as shown in FIG. 5, a leveling member 51 for leveling wrinkles generated by the rotating body 22 may be formed on the rear side in the traveling direction of the rotating body 22 of the height adjusting device 8.

  The leveling member 51 is a plate-like rubber member, and its front end is vertically attached to the rear side of the height adjusting device 8. The back surface of the leveling member 51 is in surface contact with the lower layer portion S1. Since the rotating body 22 is a disc, wrinkles are generated when it rotates on the lower layer part S1, but by providing the leveling member 51, the wrinkles can be leveled and flattened.

  Further, for example, the configuration of the height adjusting unit that adjusts the height of the height adjusting device 8 and the auxiliary height adjusting device 9 is configured by the long hole 13a or 33a and the bolt B in the present embodiment. As long as the height relative to 4 is adjustable, other forms may be used. Moreover, you may provide the front-back direction adjustment part which can adjust the fixing position of the height adjustment apparatus 8 with respect to the screed 4 and the auxiliary height adjustment apparatus 9 in the front-back direction. The front-rear direction adjusting part can be constituted by, for example, a long hole and a bolt extending in the front-rear direction in the frame parts 11, 31 of the height adjusting device 8 and the auxiliary height adjusting device.

  Further, in this embodiment, the surface layer body is divided into two layers in the upper and lower sides and spread and leveled, but the present invention may be applied when spread and spread on three or more layers. Moreover, the construction method of the surface layer body of this embodiment may be performed at the time of newly installing a surface layer body, and may be performed at the time of a maintenance.

DESCRIPTION OF SYMBOLS 1 Finisher 2 Vehicle main body 3 Hopper 4 Screed 5 Connection arm 6 Crawler part 7 Driver's seat 8 Height adjusting device 9 Auxiliary height adjusting device 22 Rotating body 42 Rotating body R Roadbed S1 Lower layer part (pre-laid paving material)
S2 Upper layer

Claims (6)

The finisher has a screed and a height adjusting device fixed to the side of the screed, and a new paving material with a predetermined thickness is placed on the paving material previously laid on the roadbed. And
The height adjusting device is:
A rotating body that rotates on the surface of the roadbed as the finisher moves;
A height adjusting unit capable of adjusting a relative height position between the screed and the rotating body,
The rotary body is made of a disc, and a part of the rotary body rotates while passing over the previously laid paving material.   The finisher according to claim 1, wherein the rotating body includes a plurality of discs that are spaced apart from each other.   The finisher according to claim 1 or 2, wherein a through-hole penetrating in the plate thickness direction is formed in the rotating body.   The leveling member for leveling the wrinkle formed by the said rotary body is formed in the surface of the said pavement material laid previously by the back side of the advancing direction of the said rotary body. The finisher according to any one of claims 3 to 4. Having an auxiliary height adjustment device fixed to the side of the screed;
The auxiliary height adjusting device includes:
A rotating body that rotates on the surface of the roadbed or on the surface of the pavement material leveled on the pre-laid pavement material as the finisher moves;
A height adjusting unit capable of adjusting the height position of the rotating body of the auxiliary height adjusting device with respect to the screed,
The finisher according to any one of claims 1 to 4, wherein the rotating body of the auxiliary height adjusting device is configured by a cylindrical drum. A primary leveling process for leveling pavement material on the roadbed with a thickness smaller than the planned pavement thickness;
A finisher having a screed is moved on the pavement material previously laid in the primary leveling step, and a secondary leveling step of newly leveling the pavement material at a predetermined thickness, and
The finisher is
A height adjusting device fixed to the side of the screed,
The height adjusting device comprises: a rotating body that rotates on the surface of the roadbed as the finisher moves; a height adjusting unit that can adjust a relative height position of the screed and the rotating body; The rotating body is made of a disc,
In the secondary leveling step, the surface layer body construction method is characterized in that the pavement material laid in advance is rotated while a part of the rotating body is covered.

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