Hydraulic mixture surface treatment device and construction method

Abstract

To provide a surface treatment device of a hydraulic mixture and a construction method of a structure capable of preventing a line from remaining in a boundary part of a layer laminated on a surface of the structure constructed by laminating the hydraulic mixture.SOLUTION: A surface treatment device 1 for a hydraulic mixture that moves with an additional manufacturing device 3 (discharging device) that discharges and stacks a hydraulic mixture 2 while moving in the area where a concrete structure 11 (structure) is to be constructed, and that levels a side surface 22 (surface) of the hydraulic mixture 2 discharged from the additional manufacturing device 3 has a brush part 5 (a leveling part) that contacts the side surface 22 of the hydraulic mixture 2 to level the side surface 22, and a brush support part 6 (a supporting part) that is attached to the additive manufacturing device 3 to support the brush part 5, and the brush part 5 is configured to be movable in the stacking direction in which hydraulic mixture 2 is stacked with respect to brush support part 6, and can be disposed below (on the side of existing layer 212 of hydraulic mixture 2) a new layer 211 of hydraulic mixture 2 discharged from additive manufacturing apparatus 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a surface treatment device for hydraulic mixtures and a method for constructing a structure. [Background technology]

[0002] The construction industry is concerned about a chronic labor shortage, and labor-saving measures are an urgent issue, particularly in the construction of concrete structures. One way to solve this problem is to precast components. In recent years, 3D printing technologies for construction use have been researched, including a method in which concrete or mortar materials are extruded and layered using additive manufacturing equipment (hereinafter referred to as layering method), and a method in which shotcrete is sprayed onto a mold using additive manufacturing equipment (hereinafter referred to as spraying method) (see, for example, Patent Document 1).

[0003] Compared to spray-type 3D printing technology, additive 3D printing technology has the advantages of not requiring a mold, being able to create free-form surfaces with high precision, allowing for greater freedom in design, and being able to change the composition internally. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-2744 [Patent Document 2] Japanese Patent Publication No. 2020-111941 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with additive 3D printing technology, the fluidity of the material is very low and the extruded material hardly spreads, so lines remain at the boundary between the already extruded layer and the layer being extruded on top of it.As a result, concrete structures made up of multiple layers can have numerous lines on their surfaces (sides), which can affect their design.

[0006] Therefore, an object of the present invention is to provide a surface treatment device for hydraulic mixtures and a construction method for structures that can prevent lines from remaining at the boundaries between layers of hydraulic mixtures on the surface of a structure constructed by layering hydraulic mixtures. [Means for solving the problem]

[0007] In order to achieve the above object, the hydraulic mixture surface treatment device of the present invention is a hydraulic mixture surface treatment device that moves together with a discharge device that discharges and layers the hydraulic mixture while moving through an area where a structure is to be constructed, and smooths the surface of the hydraulic mixture discharged from the discharge device, and has a leveling unit that comes into contact with the surface of the hydraulic mixture to smooth the surface, and a support unit that is attached to the discharge device and supports the leveling unit, and the leveling unit is configured to be movable relative to the support unit in the layering direction in which the hydraulic mixture is layered, and can be positioned closer to the existing layer of the already-installed hydraulic mixture that the new layer will overlap than the new layer of the hydraulic mixture discharged from the discharge device.

[0008] The method for constructing a structure according to the present invention is a method for constructing a structure using the above-mentioned surface treatment device for hydraulic mixture, and includes a step of bringing the leveling part into contact with the boundary between the new layer of hydraulic mixture discharged by the discharge device and the existing layer of hydraulic mixture that has already been laid on top of the new layer, and leveling the boundary.

[0009] In the present invention, the leveling unit, which is configured to be movable in the layering direction while the hydraulic mixture surface treatment device is attached to the discharge device, can be positioned closer to the existing layer of hydraulic mixture that will overlap the new layer of hydraulic mixture discharged from the discharge device. Therefore, the leveling unit can be moved together with the discharge device while positioned in contact with the boundary between the new layer of hydraulic mixture and the existing layer that will overlap it. This allows the boundary between the layers of hydraulic mixture to be leveled by the leveling unit, preventing lines from forming at the boundary between the layers of hydraulic mixture to be layered. Furthermore, since gaps between stacked layers can be eliminated, rainwater, dust, etc. can be prevented from entering the constructed structure, and deterioration and contamination of the structure can be prevented.

[0010] In the surface treatment device for hydraulic mixture according to the present invention, the leveling unit may be detachable from the support unit.

[0011] With this configuration, the surface finish of the structure can be changed by changing the type of leveling portion attached to the support portion.

[0012] In the surface treatment device for hydraulic mixture according to the present invention, the support portion may be capable of adjusting the position of the leveling portion in a direction intersecting the stacking direction.

[0013] With this configuration, the leveling section can be disposed at a desired position in accordance with the shape of the hydraulic mixture discharged from the discharge device and the shape of the leveling section. [Effects of the Invention]

[0014] According to the present invention, it is possible to prevent lines from remaining at the boundary between layers of laminated hydraulic mixtures on the surface of a structure constructed by laminating hydraulic mixtures. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view showing an example of a surface treatment device for hydraulic mixture according to an embodiment of the present invention. [Figure 2] 10A to 10C are diagrams illustrating a step of discharging a layer on a base portion in a construction method for a structure according to an embodiment of the present invention. [Figure 3] 10A and 10B are diagrams showing the discharging step of the upper layer in the method for constructing a structure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a surface treatment device for hydraulic mixture and a construction method for a structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. As shown in FIG. 1, the hydraulic mixture surface treatment device 1 according to this embodiment is used in conjunction with an additive manufacturing device 3 (dispensing device) employing 3D printing technology to construct a concrete structure 11 (structure) by dispensing and layering hydraulic mixtures such as mortar or concrete materials. The concrete structure 11 of this embodiment is a wall-like structure made up of multiple horizontally extending layers 21 stacked vertically (in the direction of arrow Z in the figure). Each layer 21 is constructed from hydraulic mixture 2 dispensed from a nozzle 31 of the additive manufacturing device 3, which moves horizontally. Each layer 21 is in the shape of a long plate or rod, and each layer has approximately the same shape in plan view when viewed from the top and bottom.

[0017] In this embodiment, as described above, the stacking direction in which the layers 21 of the hydraulic mixture 2 are stacked is the up-down direction, and the nozzle 31 moves in the horizontal direction. In the following description, the horizontal direction in which the nozzle 31 moves (the direction of arrow X in the figure) will be referred to as the movement direction or the front-to-back direction, and the horizontal direction perpendicular to the movement direction (the direction of arrow Y in the figure) will be referred to as the width direction. In the front-to-back direction, the side in which the nozzle 31 moves will be referred to as the front side, and the opposite side will be referred to as the rear side. The width direction is the direction perpendicular to the wall surface of the constructed wall-like concrete structure 11.

[0018] 1, the additive manufacturing apparatus 3 has a nozzle 31 that discharges the hydraulic mixture 2, and a nozzle support unit (not shown) that movably supports the nozzle 31. The hydraulic mixture 2 is supplied to the nozzle 31 from a tank (not shown). The hydraulic mixture surface treatment device 1 according to this embodiment is a device that moves together with the additive manufacturing device 3 and smooths the surface 22 of the hydraulic mixture 2 discharged from the nozzle 31, and is an attachment that is attached to the additive manufacturing device 3. In this embodiment, the hydraulic mixture surface treatment device 1 smooths the side surface of the hydraulic mixture 2. The side surface of the hydraulic mixture 2 is the surface facing the width direction. Hereinafter, the hydraulic mixture surface 22 smoothed by the hydraulic mixture surface treatment device 1 will be referred to as the "side surface 22."

[0019] The surface treatment device 1 for hydraulic mixture has a brush section 5 (leveling section) that contacts and levels the side surface 22 of the hydraulic mixture 2 discharged from the nozzle 31, and a brush support section 6 (support section) that supports the brush section 5. The brush support part 6 is fixed to the nozzle support part and moves together with the nozzle support part. The brush support part 6 supports the brush part 5 so that it can move in the vertical direction (stacking direction) of the hydraulic mixture 2. The brush support part 6 is arranged behind the nozzle 31. The brush support part 6 has a fixing part 61 fixed to the nozzle support part, a brush attachment part 62 to which the brush part 5 is attached, and a connection part 63 that connects the fixing part 61 and the brush attachment part 62.

[0020] The fixing part 61 has a first fixing part 611 fixed to the nozzle support part, and a second fixing part 612 to which the connecting part 63 is attached. The first fixing part 611 and the second fixing part 612 are connected to each other. The second fixing portion 612 is a long, flat plate that extends in the vertical direction and is disposed with its plate surface facing the width direction. The second fixing portion 612 is provided with a plurality of first holes 613, which are circular holes that penetrate in the width direction, spaced apart in the vertical direction. In this embodiment, the second fixing portion 612 is provided with three first holes 613 spaced apart in the vertical direction. The three first holes 613 are referred to as first holes 613a, 613b, and 613c from top to bottom.

[0021] The connecting part 63 has an inverted T-shaped cross section and includes a first connecting part 631 attached to the second fixing part 612 and a second connecting part 632 attached to the brush attaching part 62. The first connecting part 631 and the second connecting part 632 are connected to each other. The first connection portion 631 is a long, flat plate extending in the vertical direction with its plate surface facing the width direction. The first connection portion 631 is formed with a first elongated hole 633 that penetrates in the width direction and extends in the vertical direction.

[0022] The first connecting portion 631 and the second fixing portion 612 are arranged to overlap in the width direction and are fixed to be relatively movable in the up-down direction by first fixing devices 71 such as pins or bolts. Note that the first connecting portion 631 and the second fixing portion 612 are restricted from moving relatively in the width direction and the front-rear direction.

[0023] The first connecting portion 631 and the second fixing portion 612 are fixed as follows: The two lower first holes 613b, 613c of the three first holes 613 of the second connecting portion 612 and the first elongated hole 633 of the first connecting portion 631 are arranged to overlap in the width direction, and the first fixing devices 71 are inserted through the two lower first holes 613b, 613c that overlap in the width direction and the first elongated hole 633. The first connecting portion 631 is vertically movable relative to the second fixed portion 612 within a range from a height at which the upper end 633a of the first elongated hole 633 contacts the first fastener 71 inserted through the central first hole 613b of the three first holes 613 to a height at which the lower end 633b of the first elongated hole 633 contacts the first fastener 71 inserted through the lowest first hole 613c of the three first holes 613. In other words, the connecting portion 63, the brush attachment portion 62, and the brush portion 5 are vertically movable within the above-mentioned height range relative to the fixed portion 61 and the nozzle support portion. Hereinafter, the connecting portion 63, the brush attachment portion 62, and the brush portion 5 will be collectively referred to as the movable portion 4.

[0024] 1 and 3 show a state in which the upper end 633a of the first elongated hole 633 is in contact with the first fixture 71 inserted through the central first hole 613b of the three first holes 613, and the first connecting portion 631 is positioned at the bottom of the vertical range in which it can move relative to the second fixing portion 612. FIG. 2 shows a state in which the first connecting portion 631 is positioned at the middle position of the vertical range in which it can move relative to the second fixing portion 612. The movable part 4 is configured to be movable downward relative to the second fixed part 612 due to gravity. In other words, when no external force other than gravity is acting on the movable part 4, the movable part 4 is located at the lowest position where the upper end 633a of the first elongated hole 633 contacts the first fixture 71 inserted through the central first hole 613b of the three first holes 613. When an external force other than gravity is acting on the movable part 4, for example, when the lower end of the brush part 5 contacts the base part 12 (described later) or when the lower surface of the connection part 63 or the lower surface of the brush attachment part 62 contacts the layered hydraulic mixture 2, the movable part 4 is located at that height.

[0025] The second connection portions 632 are long, flat plates, and are connected to both widthwise sides of the lower end portion of the first connection portion 631 with their plate surfaces facing up and down. In other words, the second connection portion 632 on one widthwise side protrudes from the lower end portion of the first connection portion 631 to one widthwise side, and the second connection portion 632 on the other widthwise side protrudes from the lower end portion of the first connection portion 631 to the other widthwise side. Each second connection portion 632 is formed with a second elongated hole portion 634 that penetrates in the up and down direction and extends in the widthwise direction.

[0026] The brush attachment portion 62 is a long, flat plate and is arranged with its plate surface oriented horizontally. One brush attachment portion 62 is fixed to each of the second connection portions 632. The brush attachment portion 62 is formed with a third elongated hole portion 621 that penetrates in the vertical direction and extends in the width direction.

[0027] The second connection portion 632 and the brush attachment portion 62 are arranged to overlap in the vertical direction and are fixed so that relative movement in any direction is restricted by a second fastener 72 (shown by dashed lines in FIG. 1 ), such as a pin or bolt, inserted through the second elongated hole 634 of the second connection portion 632 and the third elongated hole 621 of the brush attachment portion 62. In this embodiment, the brush attachment portion 62 overlaps the underside of the second connection portion 632. The second elongated hole 634 of the second connection portion 632 and the third elongated hole 621 of the brush attachment portion 62 are formed to be longer than the diameter of the second fastener 72. The second connection portion 632 and the brush attachment portion 62 can be fixed to each other if they overlap so that portions of their elongated holes can be inserted with the second fastener 72. If the brush attachment portion 62 is arranged so that its surface overlaps with the second connection portion 632, the angle in the horizontal plane with respect to the second connection portion 632 can be set to a desired angle. As a result, the position and angle at which the brush attachment portion 62 is fixed to the second connection portion 632 can be adjusted within the length range of each of the elongated hole portions.

[0028] The brush parts 5 are fixed to the two brush mounting parts 62, one for each side. The brush part 5 has a brush body 51 that contacts the side surface 22 of the hydraulic mixture 2, and an L-shaped bracket 52 that is fixed to the brush body 51 and is also fixed to the brush mounting parts 62. One L-shaped piece (first piece 53) of bracket 52 is fixed to brush attachment portion 62, and the other piece (second piece 54) is fixed to brush body 51. First piece 53 and second piece 54 are each flat. Bracket 52 has a plate-like surface such that the plate surface of first piece 53 is horizontal, and second piece 54 extends in a direction protruding downward from one end surface of first piece 53.

[0029] The first piece 53 is formed with a second hole 55 that penetrates in the vertical direction. The first piece 53 is arranged so as to overlap the brush attachment part 62 in the vertical direction, and is fixed by a third fastener 73 (shown by a dashed line in FIG. 1 ), such as a pin or bolt, that is inserted through the third elongated hole 621 of the brush attachment part 62 and the second hole 55 of the first piece 53. When the first piece 53 of the bracket 52 is arranged so that its surface overlaps the brush attachment part 62, the brush part 5 can be set at a desired angle in the horizontal plane relative to the brush attachment part 62. As a result, the position and angle at which the brush part 5 is fixed to the brush attachment part 62 can be adjusted within the range of the third elongated hole 621 of the brush attachment part 62.

[0030] In this embodiment, the first piece 53 of the bracket 52 is disposed below the brush attachment portion 62, and the second piece 54 protrudes downward from the first piece 53. The brush main body 51 fixed to the second piece 54 is disposed below the brush attachment portion 62.

[0031] The brush part 5 is detachable from the brush attachment parts 62. In this embodiment, different types of brush parts having the same bracket 52 as above can be attached to the brush attachment parts 62. For example, brush parts made of different materials (bristle quality) or bristle amounts can be attached. Furthermore, it is sufficient that the brush part 5 is attached to at least one of the brush attachment parts 62, and the number can be changed as appropriate.

[0032] In the surface treatment device 1 for hydraulic mixture according to this embodiment, when fixing the brush attachment part 62 to the connection part 63, the position and angle of the brush attachment part 62 with respect to the connection part 63 can be adjusted within the length range of the second elongated hole part 634 of the second connection part 632 and the third elongated hole part 621 of the brush attachment part 62. When fixing the brush part 5 to the brush attachment part 62, the position and angle of the brush part 5 with respect to the brush attachment part 62 can be adjusted within the length range of the third elongated hole part 621 of the brush attachment part 62. In this way, by adjusting the positions and angles of the connection part 63, the brush attachment part 62, and the brush part 5 with respect to the fixing part 61, the position and angle of the brush part 5 with respect to the nozzle 31 can be adjusted.

[0033] The hydraulic mixture surface treatment device 1 is disposed relative to the nozzle 31 as follows: The second connection part 632 of the connection part 63 is disposed behind the discharge port of the nozzle 31 and at a position above the hydraulic mixture 2 discharged from the nozzle 31. The brush body 51 is disposed so as to be able to move up and down to a height that allows it to come into contact with the boundary part 213 between the new layer 211 of the hydraulic mixture 2 discharged from the nozzle 31 and the existing layer 212 of the hydraulic mixture 2 already laid below it.

[0034] The method for constructing a structure according to this embodiment is carried out using the additive manufacturing device 3 and the surface treatment device 11 for the hydraulic mixture. First, a base portion 12 (print base) is constructed at the bottom end of the concrete structure 11 for layering the hydraulic mixture 2 discharged from the nozzle 31 of the additive manufacturing device 3. The base portion 12 is constructed so that its planar shape when viewed from the top and bottom is larger on both sides in the width direction than the planar shape of the concrete structure 11.

[0035] Next, as shown in FIG. 2, the hydraulic mixture 2 is discharged from the nozzle 31 of the additive manufacturing device 3 onto the base portion 12. The additive manufacturing apparatus 3 and the hydraulic mixture surface treatment device 11 are installed so that the nozzle 31 and the second connection part 632 are arranged on the base part 12, and the brush body 51 is arranged above the nozzle 31. The hydraulic mixture 2 is discharged from the nozzle 31 while the nozzle 31 is moved along the base part 12, and a layer 21 of the hydraulic mixture 2 is built on the base part 12. At this time, the lower end of the brush part 5 of the movable part 4 comes into contact with the upper surface of the base part 12 and moves along the upper surface of the base part 12. The brush body 51 of the brush part 5 comes into contact with the side surface 22 of the hydraulic mixture 2 discharged onto the base part 12, leveling the side surface 22. The movable part 4 is arranged at an intermediate height within the range of heights that it can move relative to the nozzle 31 and the fixed part 61.

[0036] Next, the nozzle 31 is moved to build a new layer 21 of hydraulic mixture 2 (new layer 211) on top of the layer 21 of hydraulic mixture 2 (existing layer 212) already laid on the base part 12. At this time, the nozzle 31 and the fixed part 61 are raised, but the movable part 4 is at a height where the lower surface 63 of the connection part or the lower surface of the brush attachment part 62 comes into contact with the upper surface of the layered hydraulic mixture 2. As a result, the brush body 51 is positioned at a height where it comes into contact with the side surfaces 22 of the existing layer 212 and the new layer 211. The brush body 51, which moves together with the nozzle 31 in the movement direction (front-back direction) of the nozzle 31, smooths the boundary part 213 between the existing layer 212 and the new layer 211, preventing lines from remaining at the boundary part 213 between the existing layer 212 and the new layer 211.

[0037] 3, new layers 21 of hydraulic mixture 2 (new layers 211) are sequentially constructed on top of the layers 21 of hydraulic mixture 2 (existing layers 212) that have been stacked, and the layers 21 of hydraulic mixture 2 are stacked until a predetermined height is reached. At this time, the movable part 4 is also positioned at a height where the lower surface 63 of the connection part or the lower surface of the brush attachment part 62 comes into contact with the upper surface of the stacked hydraulic mixture 2, and the brush body 51 comes into contact with the side surfaces 22 of the existing layer 212 and the new layer 211. This prevents lines from remaining at the boundary 213 between the existing layer 212 and the new layer 211, as in the above case. In this embodiment, when the movable part 4 reaches a height where the lower surface 63 of the connection part or the lower surface of the brush attachment part 62 comes into contact with the upper surface of the laminated hydraulic mixture 2, the brush body 51 is positioned to come into contact with both the boundary part 213 between the existing layer 212 and the new layer 211, and the boundary part 215 between this existing layer 212 and the existing layer 214 further below. This allows the boundary part 215 of the layer 21 that has already been leveled by the brush body 51 to be leveled again by the brush body 51, and reliably prevents lines from remaining at the boundary part 215 of the layers 21 that are stacked above and below. Since the brush body 51 is elastically deformable, even if a step occurs between the existing layer 212 and the new layer 211, the brush body 51 can elastically deform and come into contact with the boundary portion 213 between the existing layer 212 and the new layer 211, thereby leveling out the step.

[0038] Next, the functions and effects of the hydraulic mixture surface treatment device and structure construction method according to the present embodiment will be described. The surface treatment device 1 for hydraulic mixture according to the present embodiment described above can be positioned at a height such that the brush body 51 can contact the boundary portion 213 between the new layer 211 of the hydraulic mixture 2 discharged from the nozzle 31 and the existing layer 212 of the hydraulic mixture 2 below when attached to the additive manufacturing device 3. Therefore, the brush body 51 can be moved together with the additive manufacturing device 3 while positioned in a position where it contacts the boundary portion 213 between the new layer 21 of the hydraulic mixture 2 and the existing layer 212 on which it overlaps. This allows the boundary portion 213 of the layer 21 of the hydraulic mixture 2 to be layered to be smoothed by the brush body 51, preventing lines from forming at the boundary portion 213 of the layer 21 of the hydraulic mixture 2 to be layered. Furthermore, since gaps between the stacked layers 21 can be eliminated, rainwater, dust, etc. can be prevented from entering the constructed concrete structure 11, and deterioration and contamination of the concrete structure 11 can be prevented.

[0039] Furthermore, in the surface treatment device 1 for hydraulic mixture according to this embodiment, the brush part 5 is detachable from the brush support part 6. With this configuration, the finish of the side surface 22 of the concrete structure 11 can be changed by changing the type of brush part 5 attached to the brush support part 6. For example, by attaching brush parts with different materials (bristle quality) and bristle amounts, it is possible to form different patterns while erasing the line at the boundary part 213 between the new layer 211 and the existing layer 212.

[0040] Furthermore, in the surface treatment device 1 for hydraulic mixture according to this embodiment, the brush support part 6 is capable of adjusting the horizontal position (position in a direction intersecting the stacking direction) of the brush body 51. With this configuration, the brush body 51 can be positioned at a desired position in accordance with the shape of the hydraulic mixture 2 discharged from the nozzle 31 and the shape of the brush body 51.

[0041] The above describes the embodiments of the surface treatment device for hydraulic mixtures and the construction method for structures according to the present invention, but the present invention is not limited to the above embodiments and can be modified as appropriate within the scope of the spirit of the present invention. For example, in the above embodiment, the hydraulic mixture 2 is stacked in the vertical direction, but it may be stacked in the horizontal direction or in a direction inclined relative to the horizontal direction. In the above embodiment, the brush part 5 is detachable from the brush support part 6, but it may also be fixed to the brush support part 6. Furthermore, in the above embodiment, the brush support part 6 is capable of adjusting the horizontal position of the brush body 51, but the direction and range in which the brush body 51 can be adjusted may be other than those in the above embodiment.

[0042] Furthermore, in the surface treatment device 1 for hydraulic mixtures in the above embodiment, a brush is used as the leveling part, but instead of a brush, a jig such as a sponge may be provided that can level the boundary portion 213 between the newly constructed layer 211 and the existing layer 212.

[0043] In the above embodiment, the brush body 51 is positioned so as to contact both the boundary portion 213 between the existing layer 212 and the new layer 211, and the boundary portion 213 between this existing layer 212 and the existing layer 212 below. However, if it is possible to level the boundary portion 213 between the existing layer 212 and the new layer 211, the brush body 51 may be positioned so as not to contact the boundary portion 213 of the layer 21 below.

[0044] Furthermore, the movable part 4 that can move in the vertical direction may be moved automatically, and may be movable by a drive source such as a motor drive or a cylinder drive.

[0045] The position and angle at which the brush part 5 is fixed to the brush attachment part 62 may be determined automatically, and for example, the positioning or angle may be determined by a drive source such as a motor drive or a cylinder drive. [Explanation of symbols]

[0046] 1. Surface treatment equipment for hydraulic mixtures 2 Hydraulic mixture 3 Additive manufacturing equipment (extrusion equipment) 4 Moving parts 5 Brush section (leveling section) 6 Brush support part (support part) 11 Concrete structures (structures) 21 layers 22 Side 31 nozzles 211 New Layer 212,214 Existing layer 213,215 Boundary part

Claims

1. A surface treatment device for hydraulic mixture that moves together with a discharge device that discharges and layers hydraulic mixture while moving in an area where a structure is to be constructed, and smooths the surface of the hydraulic mixture discharged from the discharge device, a leveling unit that contacts the surface of the hydraulic mixture to level the surface; a support portion attached to the discharge device and supporting the leveling portion, the leveling unit is configured to be movable relative to the support unit in a stacking direction in which the hydraulic mixture is stacked, and can be arranged closer to the existing layer of the hydraulic mixture that has already been laid and on which the new layer will overlap than the new layer of the hydraulic mixture discharged from the discharge device; The support portion is a fixing portion fixed to a nozzle support portion that supports a nozzle of the discharge device; A flat brush attachment portion to which the leveling portion is attached; a connecting portion having an inverted T-shaped cross section and a flat plate shape that connects the fixing portion and the brush attachment portion, the support portion is capable of adjusting a position of the leveling portion in a direction intersecting the stacking direction, The brush attachment portion and the connection portion each have a long hole formed therein, A surface treatment device for hydraulic mixtures in which the brush mounting portion and the connecting portion are fixed so that their surfaces overlap by inserting a fixing device into the long hole of the brush mounting portion and the long hole of the connecting portion.

2. The surface treatment device for hydraulic mixture according to claim 1 , wherein the leveling unit is detachable from the support unit.

3. A method for constructing a structure using the surface treatment device for hydraulic mixture according to claim 1 or 2, A method for constructing a structure, comprising a step of bringing the leveling part into contact with a boundary portion between a new layer of the hydraulic mixture discharged by the discharge device and an existing layer of the hydraulic mixture that has already been laid and on which the new layer overlaps, thereby leveling the boundary portion.

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