KR101526827B1 - 3d printing apparatus and constructing method of steel frame concrete structure using the same - Google Patents

Abstract

The present invention relates to a 3D printing apparatus which is capable of constructing a steel frame concrete structure, and to a construction method using the 3D printing apparatus, wherein the 3D printing apparatus comprises: a base frame; a movable unit which is movably installed on an upper part of the base frame; an extrusion head which is installed on one side of the movable unit and discharges a print raw material; and a jet nozzle which is installed on the other side of the movable unit and jets metal powder.

Description

Technical Field [0001] The present invention relates to a 3D printing apparatus and a method of constructing a steel frame using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 3D printing apparatus and a method of using the same, and more particularly, to a 3D printing apparatus capable of constructing a steel frame structure and a construction method using the same.

3D printing (3D printing) is a technology that is getting popular in recent years. It refers to the technology to produce solid three-dimensional products by injection, lamination and solidification of plastic liquids or other raw materials. Ease of use, and so on.

3D printing is divided into liquid, powder, and solid depending on the raw materials. There are various methods of coagulating / laminating based on sources such as laser, heat, and light. 3D printing methods have been developed variously so far. It has advantages and disadvantages in production.

The 3D printing method can be used in different fields in different fields. FDM (Fused Deposition Modeling), DLP (Digital Light Processing), SLA (Stereolithography), SLS (Selective Laser Sintering), PolyJet (Photopolymer Jetting Technology) , DMT (direct metal tooling), PBP (powder bed & inkjet head 3d printing), and LOM (Laminated Object Manufacturing).

Generally, a wire or filament made of thermoplastics is fed through a feed reel and a feed reel, and the fed filament is melted in a heater nozzle mounted on a three-dimensional feeding mechanism that is positioned relative to the workbench in three directions X and Y (FDM), which forms a two-dimensional planar shape by laminating it one by one on a workbench and molding it into three dimensions, is widely used.

Examples of methods and apparatuses for fusing a layer of cohesive modeling material from the extrusion head to produce a three-dimensional model are found in many of the existing patents and are described in, for example, US Pat. No. 5,121,329, Or fed into the extrusion head in the form of a flexible filament wound on the feed reel. At this time, the extrusion head uses a coagulant material which adheres to the preceding layer by proper bonding at the time of solidification, and a thermoplastic material is mainly used, which is known to be particularly suitable for such melt lamination.

However, when a concrete structure is to be constructed using the above-described 3D printer, there is a problem that it takes a long time to produce the concrete because of its basic characteristics.

Concrete is a mixture of water, cement, and sand. It uses hydration reaction in which cement reacts with water to harden it. The solidification rate of concrete is slower than the extrusion speed at the extrusion head. Time is greatly influenced by the solidification rate.

That is, since the extrusion head of the 3D printer extrudes the concrete while moving at a high speed, it takes a considerable time to coagulate the extruded concrete. Therefore, when the concrete is extruded again on the layer which is not completely solidified, There is a problem.

On the other hand, when a work is carried out in such a manner that one layer is stacked and a complete solidification is made and then the layers on the other layer are laminated again, there is a problem that the working time is remarkably increased and the productivity is lowered.

In addition, in the case of a steel concrete structure in which reinforcing bars or steel beam beams are reinforced by a skeleton in a concrete, it is difficult to manufacture a structure in which such heterogeneous materials are combined by a conventional 3D printer.

Particularly, since the melting temperature of the reinforcing steel or steel beam is very high, the application of the melt lamination method described above is unsuitable, and when the size of the structure is large, there is a problem that the structure can not be supported by a separate work table.

US 5121329 B (June 6, 1992 Enrollment) KR 1073750 B1 (October 10, 2011 Enrollment)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a 3D printer capable of constructing a steel-frame concrete structure and a construction method thereof.

The above object of the present invention can be achieved by an ink jet recording head comprising a base frame, a moving part movably installed on the upper part of the base frame, an extrusion head provided on one side of the moving part and discharging the printing material, The present invention can be achieved by providing a 3D printing apparatus including a spray nozzle for spraying powder metal.

According to a preferred aspect of the present invention, the extrusion head may further include a first material supply unit for supplying the concrete mixture as the print material, and a second material supply unit for supplying the powder metal to the injection nozzle.

According to another preferred aspect of the present invention, the extrusion head may further include a third raw material supply portion for supplying the synthetic resin as the print raw material.

According to another preferred aspect of the present invention, the microwave irradiation unit may further include a microwave irradiator provided at one side of the extrusion head for irradiating and curing the concrete mixture discharged through the extrusion head.

According to another preferred aspect of the present invention, the apparatus may further include a laser irradiator provided at one side of the spray nozzle for irradiating the powder metal sprayed through the spray nozzle to sinter and cure the laser.

According to another preferred aspect of the present invention, the apparatus may further include a cleaning device installed at one side of the extrusion head for ejecting high-pressure cleaning water to remove the residual mixture in the extrusion head.

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It is another object of the present invention to provide a method of constructing a steel frame concrete structure using a 3D printing apparatus, comprising the steps of: (a) discharging a synthetic resin through an extrusion head and curing the steel plate by laser irradiation to form a steel frame boundary layer; b) forming a concrete layer by curing by microwave irradiation after discharging the concrete mixture through an extrusion head, and c) spraying powder metal through a spray nozzle, and sintering and curing by laser irradiation to form a steel- Wherein the steel frame and the concrete layer are continuously laminated in a shape of a structure to be constructed by repeating the steps of (a) to (c). ≪ / RTI >

According to a preferred embodiment of the present invention, the step (a) may further include the step of forming a concrete outer boundary layer by curing the resin by laser irradiation after discharging the synthetic resin through the extrusion head.

According to another preferred aspect of the present invention, the step (b) may further include the step of injecting high-pressure washing water into the extrusion head to wash and remove the residue.

According to another preferred feature of the present invention, in the step (c), when the powder metal is sintered and cured by laser irradiation, the steel frame boundary layer is removed.

According to the 3D printing apparatus and the method of constructing a steel frame concrete structure using the same, the steel frame structure and the concrete layer can be laminated in a desired form on a plane to easily produce a three-dimensional steel frame structure.

At this time, the coagulation time of the concrete mixture extruded on a plane is shortened by microwave irradiation, and therefore productivity is improved.

Also, by forming a boundary layer with a synthetic resin material along the outlines of the steel-concrete layer and the concrete layer, the numerical accuracy can be improved.

1 is a configuration diagram of a 3D printing apparatus according to an embodiment of the present invention;
2 is a schematic perspective view of a base frame and a moving part according to an embodiment of the present invention;
3 is a schematic perspective view of a base frame and a moving part according to another embodiment of the present invention.
4 is a perspective view of an extrusion head and an injection nozzle according to an embodiment of the present invention.
5 is a configuration diagram of a cleaning apparatus according to an embodiment of the present invention;
FIG. 6 is an internal configuration view of a spray nozzle according to an embodiment of the present invention; FIG.
7 is a flowchart of a method of constructing a steel-concrete structure according to an embodiment of the present invention.
FIG. 8 is a process diagram showing a construction procedure of a steel-frame concrete structure according to an embodiment of the present invention; FIG.
Figure 9 is a schematic diagram illustrating an example of a steel-concrete structure that may be manufactured in accordance with an embodiment of the present invention.
10 is a process diagram showing a construction procedure of a steel-frame concrete structure according to another embodiment of the present invention.
11 is a process diagram showing a construction procedure of a steel-frame concrete structure according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the embodiments described below are only for explanation of the embodiments of the present invention so that those skilled in the art can easily carry out the invention, It does not mean anything. In describing various embodiments of the present invention, the same reference numerals are used for components having the same technical characteristics.

1 is a configuration diagram of a 3D printing apparatus according to an embodiment of the present invention.

1, a 3D printing apparatus 100 according to an exemplary embodiment of the present invention includes a base frame 200 installed on the floor of a workplace, An extrusion head 400 installed on one side of the moving part 300 for discharging the print material and an injection nozzle 500 disposed on the other side of the moving part 300 for spraying the powder metal ).

According to an embodiment of the present invention, the concrete mixture is discharged through the extrusion head 400 while the moving part 300 moves along a predetermined path in the work area on the upper part of the base frame 200, 500). ≪ / RTI > At this time, the discharged concrete mixture rapidly solidifies by microwave, and the injected powder metal is sinter-hardened by laser irradiation to form one layer. By stacking these layers continuously, the steel-concrete structure 10 in which the concrete and the metal are combined is produced in a desired three-dimensional shape.

2 is a schematic perspective view of a base frame and a moving unit according to an embodiment of the present invention.

The base frame 200 serves to support the moving unit 300 and also sets a working area in which 3D printing is performed.

As an example, the base frame 200 may include four vertical frames 210 that are vertically spaced apart from each other on a square work floor, as shown in FIG. At this time, each vertical frame 210 is vertically erected at a corner portion of a rectangular worksite.

A lifting frame 220 is installed inside a space defined by the vertical frame 210. The lifting frame 220 is lifted by a height of the vertical frame 210 by driving a motor (not shown) or a cylinder (not shown) It is possible to move up and down along the direction. For example, the lifting frame 220 may be formed by four unit frames coupled in a quadrangular shape. Each unit frame 221 is vertically installed between a pair of adjacent vertical frames 210, (Not shown) provided on the slide rail 210.

A moving frame 230 is provided so as to cross a pair of unit frames 221 facing each other in the left-right direction. At this time, both ends of the moving frame 230 are slidably coupled to the left and right unit frames 221, and the moving frame 230 is moved forward and backward along the longitudinal direction of the left and right unit frames 221 .

A moving unit 300 in the form of a block is installed on one side of the moving frame 230 so as to be slidable along the longitudinal direction of the moving frame 230 by a motor (not shown) drive or a cylinder (not shown) operation.

Therefore, the moving unit 300 is movable in the three axis (x, y, z) directions in the working area inside the base frame 200. For example, in the present embodiment, the movement of the moving part 300 in the z-axis direction (height direction in the drawing) can be achieved by moving the lifting frame 220 along the height direction of the vertical frame 210. The movement of the moving part 300 in the Y axis direction (forward and backward direction in the drawing) can be achieved by moving the moving frame 230 along the longitudinal direction of the left and right unit frames 221. The movement of the moving part 300 in the x-axis direction (left-right direction in the drawing) can be achieved by moving the moving part 300 along the longitudinal direction of the moving frame 230. Of course, it is also possible for the moving part 300 to move diagonally by moving at least one of the lifting frame 220, the moving frame 230 and the moving part 300 simultaneously.

3 is a schematic perspective view of a base frame and a moving part according to another embodiment of the present invention.

In another embodiment of the present invention, a pair of rails 240 are provided on the bottom surface of the work space so as to be spaced apart from each other in the lateral direction, and a vertical frame 210 is moved along the rails 240 on each of the rails 240 It may be installed as much as possible. At this time, the moving frame 230 is installed so as to be able to move up and down across the vertical frame 210, and the moving part 300 is installed on one side of the moving frame 230 so as to be movable forward and backward. In this case, the x-axis movement of the moving unit 300 is performed by moving the vertical frame 210 along the rails 240, and the y-axis movement is performed when the moving unit 300 moves the length of the moving frame 230 And movement in the z-axis direction is performed by moving the moving frame 230 along the height direction of the vertical frame 210. At this time, it goes without saying that each movement is performed by controlling a motor (not shown) drive or a cylinder (not shown) operation.

In another embodiment of the present invention, when the rail 240 is installed on the floor of the worksite, the length of the rail 240 can be varied according to the length of the structure to be constructed, . In addition, since the disassembly and reinstallation of the base frame 200 is not required, cost and time can be saved.

Referring again to FIG. 1, an extrusion head 400 and an injection nozzle 500 are provided on the bottom surface of the moving part 300 in a downward direction.

The concrete mixture is discharged through the extrusion head 400, and the powder metal is injected through the injection nozzle 500. To this end, a raw material supply part 600 for supplying the concrete mixture and the powder metal to the moving part 300 is installed at one side of the base frame 200.

The raw material supply unit 600 includes a reservoir 610 in which the respective print materials are stored, a supply pipe 620 connected to the reservoir 610 and the moving unit 300 so as to communicate with each other, a valve 630 for opening and closing the supply pipe 620 And a supply pump 640 installed at one side of the supply pipe 620 to supply the raw material of the storage tank 610 to the moving unit 300.

At this time, the reservoir 610 preferably includes a first reservoir 611 for storing the concrete mixture, a second reservoir 612 for storing the powdered metal, and a third reservoir 613 for storing the synthetic resin And is supplied to the moving part 300 through different supply pipes 620 so that the respective print materials are not mixed with each other.

For example, the concrete mixture is supplied to the moving part 300 along the first supply pipe 621 by the operation of the first supply pump 641, and is discharged to the working area through the extrusion head 400. The powder metal is supplied to the moving part 300 along the second supply pipe 622 by the operation of the second supply pump 642 and is injected into the working area through the injection nozzle 500. [ The synthetic resin is supplied to the moving part 300 along the third supply pipe 623 by the operation of the third supply pump 643 and is discharged to the working area through the extrusion head 400.

4 is a perspective view of an extrusion head and an injection nozzle according to an embodiment of the present invention.

4, the bottom of the extrusion head 400 according to an embodiment of the present invention includes a discharge port 410 through which a concrete mixture is discharged, a discharge port 410 provided at one side of the discharge port 410, A wave irradiation unit 420 is provided.

Here, the concrete mixture is made by mixing cement, water, and aggregate such as sand, gravel or gravel. The microwave irradiation unit 420 irradiates the microwave to cure the concrete mixture discharged into the working area. Microwave is an electromagnetic wave having a wavelength of 1 mm to 1 m and a frequency of 300 GHz to 300 MHz to evaporate moisture contained in a concrete mixture to rapidly solidify a concrete mixture to be discharged and stacked.

Since the concrete mixture has a very low thermal conductivity, even if the concrete mixture layer is formed thin, it is difficult to dry it only to the center portion within a short time by the external heating method using general heat conduction and thermal radiation.

On the other hand, when the microwave is irradiated, it is possible to dry the concrete mixture layer in a short time by taking advantage of the fact that the water molecules contained in the concrete mixture are polarized. When the electric field is applied to the concrete mixture by irradiating the microwave, the positively charged portion of the water molecule is directed to the negative electrode, and the negatively charged portion is aligned to the positive electrode. When the direction of the electric field is changed, And is rotated and aligned according to the direction of the electric field. As the water molecules are rearranged, the kinetic energy is transferred to the surrounding water molecules by the collision between molecules, and the water contained in the concrete mixture is heated at a high speed.

That is, since the inside and the outside of the concrete mixture layer are heated simultaneously by the microwave irradiation, the moisture of the concrete mixture can be evaporated more quickly and stably than the general external heating method.

It is preferable that the extrusion head 400 is installed to be rotatable with respect to the moving part 300. This is because when the microwave irradiation part 420 moves along the movement trajectory of the discharge port 410 when the moving part 300 moves, So that the mixture can be rapidly solidified. As another example, it is also possible that the discharge port 410 is formed at the center of the bottom of the extrusion head 400 and the microwave irradiation unit 420 is provided in the moving direction of the discharge port 410 (e.g.

5 is a configuration diagram of a cleaning apparatus according to an embodiment of the present invention.

The concrete mixture remaining in the discharge port 410 may naturally coagulate with the lapse of time, thereby causing a problem that the discharge port 410 is clogged. Therefore, after completion of the formation of the concrete layer, it is necessary to remove the concrete mixture remaining in the discharge port 410.

The cleaning device 430 is installed on one side of the discharge port 410 and includes a washing water tank 431 installed on one side of the storage tank 610 and at least one washing water spraying nozzle 432 provided on the inner circumferential surface of the discharge port 410, And a washing water pump 433 for supplying the washing water to the washing water spraying nozzle 432. And may further include a chemical reservoir 434 installed at one side of the wash water reservoir 610 as required. The chemical reservoir 434 stores a chemical for dissolving the concrete mixture. The chemical may be injected into the wash water reservoir 610, mixed with the wash water, and then injected through the injection nozzle 500.

Meanwhile, in the above-described embodiment, the example in which the concrete mixture is discharged as the print raw material through the extrusion head 400 has been described. As another example of the present invention, the concrete mixture and the synthetic resin are alternately discharged through the extrusion head 400 . At this time, it is preferable to clean the discharge port 410 by the cleaning device 430 whenever the print material is replaced.

Referring to FIG. 4 again, the injection nozzle 500 according to an embodiment of the present invention is disposed downward on the bottom surface of the moving part 300, and the powder metal is injected through the injection nozzle 500.

At this time, the sprayed powder metal is sintered and cured by laser irradiation. It is preferable that the laser irradiation unit 520 is provided in the spray nozzle 500 so that the spraying of the powder metal and the sintering by the laser irradiation proceed substantially simultaneously . This will be described with reference to FIG.

6 is an internal configuration diagram of the injection nozzle according to an embodiment of the present invention.

According to an embodiment of the present invention, the injection nozzle 500 is formed of a substantially cylindrical body, and the lower end portion thereof is formed with an outer peripheral surface inclined downward inwardly and an injection port 510 is formed at a central portion thereof.

A laser irradiation unit 520 is formed in the injection nozzle 500 perpendicularly to the injection port 510. The laser irradiation unit 520 and the injection port 510 are connected to a cylindrical guide pipe 530 Lt; / RTI > The powder metal supplied from the second reservoir 612 to the moving part 300 is discharged through the flow pipe 540 to the injection nozzle 500. The flow pipe 540 is formed along the outer circumference of the guide pipe 530, And is guided to the jetting port 510 of the ink jet recording head. The injection of the powder metal is preferably carried out through the flow of inert gas.

The lower end of the flow tube 540 is preferably inclined inwardly downward by a predetermined angle so that the powder metal is injected at the correct position and laser-sintered. If the inclination angle alpha of the lower end of the flow pipe 540 is too large, the powder metal can be sintered while the powder metal falls onto the steel frame layer. If the inclination angle is too small, powder metal is stacked at a position outside the laser irradiation area . Therefore, the inclination angle of the lower end of the flow tube 540 needs to be appropriately selected in consideration of the standard of the injection nozzle 500, and the gap between the steel layer 20 (see FIG. 8) and the injection nozzle 500.

Referring again to FIG. 1, a control panel 700 may be provided on one side of the raw material supply part 600 or on one side of the base frame 200. The control unit 700 controls the amount of the raw material supplied to the extrusion head 400 and the injection nozzle 500 and the amount and flow rate of the raw material discharged from the extrusion head 400 and the injection nozzle 500, And controls the overall operation of the 3D printing apparatus 100, such as the irradiation amount of the microwave and the laser, and the control of the cleaning device 430.

FIG. 7 is a flowchart illustrating a method of constructing a steel-frame concrete structure according to an embodiment of the present invention, and FIG. 8 is a process diagram illustrating a construction procedure of a steel-concrete structure according to an embodiment of the present invention.

Hereinafter, a method of constructing a steel-frame concrete structure according to an embodiment of the present invention will be described in detail with reference to FIGS. 7 and 8. FIG.

Steel frame  Forming and curing step ( S10 ):

First, the steel metal layer 20 is formed by spraying powder metal. At this time, the powder metal may be appropriately selected in consideration of the required strength and material cost, and may be made of, for example, steel or an alloy material such as aluminum or titanium.

The powder metal is supplied from the second reservoir 612 through the second supply pipe 622 to the injection nozzle 500 of the moving part 300 and is injected through the flow pipe 540 and the injection port 510. The injected powder metal is sinter-hardened by the laser irradiated from the laser irradiation unit 520.

At this time, the injection nozzle 500 is moved by the movement of the moving part 300, and the steel ball layer 20 is formed while moving along the predetermined path by the control part 700.

The control unit 700 determines the laser irradiation amount according to conditions such as the moving speed of the injection nozzle 500, the distance between the laser irradiation unit 520 and the steel layer 20, the material characteristics, etc., and controls the operation of the laser irradiation unit 520 So that the steel layer 20 is formed.

Concrete layer  Formation step ( S20 ):

The concrete mixture is discharged to form a concrete layer (30). The concrete mixture supplied from the first reservoir 611 to the moving part 300 through the first supply pipe 621 is discharged through the extrusion head 400.

The extrusion head 400 is moved by the movement of the moving part 300 and moves along a predetermined path by the controller 700 to form the concrete layer 30. [

Concrete layer  Curing step ( S30 ):

The concrete layer 30 is irradiated with a microwave to be cured. The microwave irradiation unit 420 is provided at one side of the discharge port 410 of the extrusion head 400 through which the concrete mixture is discharged and hardens the concrete layer 30 along the movement trajectory of the discharge port 410 when the moving unit 300 moves. .

In the concrete layer 30, water contained in the concrete mixture is instantaneously evaporated by the microwave, and rapid curing is performed. At this time, the microwave irradiation amount is controlled by the control unit 700. The control unit 700 determines the amount of microwave irradiation according to conditions such as the moving speed of the extrusion head 400, the distance between the microwave irradiation unit 420 and the concrete layer 30, the amount of water contained in the concrete mixture, The operation of the irradiation unit 420 is controlled so that the concrete layer 30 is rapidly solidified.

On the other hand, if necessary, the curing rate of the concrete layer 30 in the portion adjacent to the steel-frame layer 20 can be appropriately adjusted so as to give a sufficient time for the steel-concrete layer 20 and the concrete layer 30 to be sufficiently bonded . For example, the boundary between the steel layer 20 and the concrete layer 30 can be cured in the last path of the concrete layer curing step S30.

Repeat step ( S40 ):

The above-described steps S10 to S30 are repeated until a 3D (three-dimensional) shape of the structure to be installed is formed.

At this time, the steel layer 20 and the concrete layer 30 which are laminated one by one are formed on the basis of each 2D layer data obtained based on the 3D shape modeling of the structure. For example, first, a 3D shape of a structure is modeled and then sliced into a plurality of layers along a height direction to obtain 2D data. Then, the 3D printing apparatus 100 is used to laminate the final form of the structure while printing one layer at a time according to each 2D data.

For the completed 3D printing apparatus 100, it is preferable to clean the inside of the extrusion head 400 to remove the residual print material so that the outlet of the extrusion head 400 is not clogged by the solidification of the residual print material.

FIG. 9 is a schematic view showing an example of a steel frame concrete structure that can be manufactured according to an embodiment of the present invention. According to the 3D printing apparatus according to the present invention, the steel frame concrete beam 11 of FIG. a steel frame concrete structure 10 in which a steel layer 20 and a concrete layer 30 are combined can be formed like the reinforced concrete column 12 of Fig. Of course, the configuration of the structure shown in FIG. 9 is merely an example that can be manufactured according to the embodiment of the present invention, and various types of steel concrete structures 10 can be constructed.

10 is a process diagram showing a construction procedure of a steel frame concrete structure according to another embodiment of the present invention.

In the embodiment described above with reference to FIGS. 7 and 8, an example of forming the concrete layer 30 after forming the steel frame layer 20 has been described. At this time, the moving part 300 forms the steel-frame layer 20 while moving along the predetermined path in the steel-frame layer 20 forming area, and moves to the concrete-layer forming area after completion of the steel- To form a concrete layer (30).

10 shows a construction method of forming the steel layer 20 after the concrete layer 30 is first formed. At this time, the moving part 300 forms the concrete layer 30 by moving along the predetermined path in the forming area of the concrete layer 30, and then moves to the forming area of the steel layer 20 to form the steel layer 20 Respectively. Here, in order to bond the concrete layer 30 to the steel layer 20, it is needless to say that the steel layer 20 must be formed before the concrete layer 30 is completely hardened by curing.

Although not shown in the drawings, the steel frame layer 20 and the concrete layer 30 are not sequentially formed separately as described above, but the steel frame layer 20 is formed on one movement of the moving part 300 along the movement path, And the concrete layer 30 are formed together.

For example, in the case of the structure shown in Fig. 9 (a), the concrete layer 30 on the left side of the steel layer 20 is formed while the moving part moves once along the "A" 20) - The formation of the concrete layer 30 on the right side of the steel-frame layer 20 can be performed sequentially.

11 is a process diagram illustrating a construction procedure of a steel-frame concrete structure according to another embodiment of the present invention.

The concrete layer 30 is formed by rapid curing in accordance with the injection of the concrete mixture and irradiation of the microwave. At this time, the concrete mixture has some fluidity due to moisture, so that when the concrete layer 30 is formed first and then the adjacent steel layer 20 is formed, Forming region, the area for forming the steel-frame layer 20 may be reduced or the internal strength of the steel-frame layer 20 may be lowered.

11 shows an example in which a steel frame boundary layer 40 made of synthetic resin is first formed in the boundary region between the concrete layer 30 and the steel frame layer 20 in order to prevent the above-described problems.

The synthetic resin may be selected from photo-curable synthetic resins and is supplied to the extrusion head 400 through the third supply pipe 623 in the third reservoir 613. The moving part 300 moves along the outer boundary line of the steel wire layer 20 inputted in advance and the synthetic resin discharged through the extrusion head 400 is cured by the laser irradiation part 520 of the following injection nozzle 500 And the steel outer boundary layer 40 is formed. At this time, the extrusion head 400 and the injection nozzle 500 are rotated (rotated) on the bottom surface of the moving part 300 so that the laser irradiation part 520 can follow the movement locus of the extrusion head 400 when the moving part 300 is moved. Is preferably mounted on a rotatable plate 310 (see Fig. The control unit 700 controls the rotation angle of the rotation plate 310 so that the injection nozzle 500 moves following the movement trajectory of the extrusion head 400.

When the formation of the steel frame boundary layer 40 is completed, the concrete layer 30 and the steel frame layer 20 are formed. At this time, it is preferable that the concrete layer 30 and the steel-frame layer 20 are formed sequentially or concurrently as described above, and the extrusion head 400 is washed before the concrete mixture is discharged to remove the residual synthetic resin .

When forming the steel-frame layer 20, a laser with a higher output than the laser irradiated to the light-curable synthetic resin is irradiated when the steel frame boundary layer 40 is formed, and the synthetic resin material formed at the boundary between the steel layer 20 and the concrete layer 30 The steel frame boundary layer 40 is removed by a method such as melting or burning and the steel layer 20 and the concrete layer 30 are directly bonded to each other.

The outer boundary line portion of the concrete layer 30 may be roughly formed by the pre-curing flow of the concrete mixture. To prevent this, the concrete outer boundary layer 50 made of synthetic resin along the outer boundary line of the concrete layer 30, Can be formed. In this case, the surface of the completed structure is coated with a synthetic resin, and the synthetic resin on the surface can be removed after completion of the structure, if necessary. The surface roughness of the structure from which the synthetic resin is removed has an advantage that it is formed more smoothly than when the synthetic resin is not used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: 3D printing device
200: base frame
300:
400: extrusion head
410:
420: microwave irradiation unit
430: Cleaning device
500: injection nozzle
510: nozzle
520: laser irradiation unit
600:
700:

Claims (12)

A base frame;
A moving part movably installed on an upper portion of the base frame;
An extrusion head installed at one side of the moving part and discharging a print material;
A spray nozzle installed on the other side of the moving part and spraying powder metal;
A first raw material supply part supplying the concrete mixture as the print raw material to the extrusion head;
A second raw material supply unit for supplying the powder metal to the spray nozzle; And
And a third raw material supply portion for supplying synthetic resin as the print raw material to the extrusion head. delete delete The method according to claim 1,
Further comprising a microwave irradiator provided at one side of the extrusion head for irradiating the cured concrete mixture discharged through the extrusion head to cure the cured mixture. The method according to claim 1,
Further comprising a laser irradiator provided at one side of the spray nozzle for irradiating the powder metal sprayed through the spray nozzle to sinter and cure the powder metal. The method according to claim 1,
Further comprising a cleaning device installed at one side of the extrusion head for ejecting high-pressure cleaning water to remove the residual mixture in the extrusion head. delete delete A method of constructing a steel-concrete structure using a 3D printing apparatus,
(a) discharging a synthetic resin through an extrusion head, and then curing it by laser irradiation to form a steel frame boundary layer;
(b) discharging a concrete mixture through an extrusion head, and curing the mixture by microwave irradiation to form a concrete layer; And
(c) spraying powder metal through a spray nozzle and sintering and curing by laser irradiation to form a steel-steel layer,
Wherein the steel layer and the concrete layer are continuously laminated in a shape of a structure to be constructed by repeating the steps (a) to (c). The method of claim 9,
Wherein the step (a) further comprises the step of forming a concrete outer boundary layer by curing the synthetic resin by laser irradiation after discharging the synthetic resin through the extrusion head. The method of claim 9,
Wherein the step (b) further comprises the step of injecting high-pressure cleaning water into the extrusion head to clean and remove the residues. The method of claim 9,
Wherein the step (c) comprises removing the steel boundary layer when the sintering and curing of the powder metal by laser irradiation is performed.

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