KR101677943B1 - Indicator of underground pipe - Google Patents

Abstract

The present invention relates to an underground pipe indicator including: an outer core (110) where a sign (111) and an indicator direction (117) are engraved in a circular plate-shaped surface, a first coupling groove (112) and a second coupling groove (113) being provided at the center of the outer core (110), the first coupling groove (112) having a predetermined depth, the second coupling groove (113) having a predetermined depth on a bottom surface of the first coupling groove (112), and the second coupling groove (113) being smaller in diameter than the first coupling groove (112); an inner core (120) inserted and formed in the shape of a circular plate with an outer diameter corresponding to the first coupling groove (112) and having a surface where an underground pipe name (121), a management agency name (122), and a movement direction mark (123) are displayed by means of blacking printing or screen printing; and an NFC tag (130) inserted into the second coupling groove (113) and storing underground pipe information and a management agency server address such that a worker can confirm or record the underground pipe information by means of smartphone tagging or check in real time additional information provided by a server. The present invention is attached by means of an adhesive to a building wall or the front surface of a curve (103) between a sidewalk (101) and a road (102) so that an underground pipe (104) buried under the road (102) is shown.

Description

{INDICATOR OF UNDERGROUND PIPE}

The present invention relates to a signpost for a buried pipe, and more particularly, to a signpost which is installed on a front surface of a sidewalk between a sidewalk and a road or on a wall of a building so as to mark various kinds of buried pipelines buried in the ground of the road, The present invention relates to the provision of a buried pipeline sign that can easily grasp information on buried pipelines and is easy to install and maintain.

Generally, buried pipelines such as various pipelines such as a sewer, a sewage pipe and a gas supply pipe, and electric lines are buried in the ground while forming a complicated path. Information about such buried pipelines, for example, types of buried pipelines and paths of travel can be grasped on the ground.

Generally, a marker is installed on an indicator vertically above a landing position of a buried channel, and a schematic configuration of a marker conventionally used conventionally will be described with reference to FIG. 10 as follows.

A head 10 having embossed type 11 of a buried channel to be a target and a predetermined arrow 12 indicating the direction in which the buried channel advances is provided on the upper part of the indicator body, A pin 20 extending in a predetermined length from the bottom surface of the pin 20 is protruded. Accordingly, the head 20 is buried so as to be fixed to the ground while the head 10 is exposed on the ground.

Meanwhile, as an example of a marking machine to which the above-described conventional technology is applied, a configuration of a buried indicator of the known registered utility model 20-0121770 will be described. In the upper surface, the contents of an object embedded in the lower part of the road can be displayed as a double- Wherein the screw insertion hole is formed at the center of the screw insertion hole, the right and left arrows of the screw insertion hole protrude in a direction opposite to each other on the straight line, and a through hole is formed in one side; And a wedge is inserted in the lower part of the support pipe. In the structure in which only the disk is exposed on the upper surface of the road, an object is buried At the same time, the arrows are configured to indicate the direction of the progress line of the embedded pipeline.

Registration Utility Model No. 20 - 0121770 Registration No. 10 - 1240625 Registration Utility Model No. 20 - 0311853 Registration Utility Model No. 20 - 0152295

The above-mentioned conventional embedded display device has a structure in which a head and a pin are integrally formed on the upper and lower sides of the body, and are drilled on a vertically upward land at a landing position of the buried channel and then mounted on the ground.

Therefore, in the buried display device of the related art, since the head is directly exposed to the road surface of a road or sidewalk on which a car runs, there is a great risk of damage or damage, and when the pin is buried in the ground to hit the head, Core drill and other necessary equipments and technology are required to drill the holes necessary for installation and to inject the fixing solution into the perforated holes. Because the installation cost is excessive and the durable metal material is manufactured from the raw material, There is a problem that it is complicated and the cost is rising and theft is also a concern.

In addition, when road conditions change due to road re-packaging or excavation work, it is virtually impossible to collect the original in a state of perfect integrity due to wear of the buried indicator or asphalt or concrete surrounding the buried indicator, The information displayed on the head of the buried indicator is limited to the type and direction of the buried channel.

On the other hand, when the installation standards such as the mark indicating the location of the buried pipelines in the Article 27 of the Enforcement Regulations of the Road Act by the Ministry of Land Transportation Act are examined, In addition to the material, color and size of the mark, the installation location and the installation method are specified and announced.

However, since most of the current markers are not deviated from the above-described conventional structures, the roads without the sidewalks and the roads with the sidewalks are commonly used as set forth in the above-mentioned Enforcement Regulations.

Accordingly, development of a marker that improves durability, ease of installation, and permanence is strongly required by following the rules of the recognition mark installed on the road where there is a report set forth in the road rule enforcement rule.

Accordingly, the present invention has been made to solve the above-mentioned problems,

The buried pipe signboard according to the present invention includes an outer core 110 formed in a disk shape and having a guiding text 111 and a signboard direction 117 displayed on the surface at an engraved angle, An internal core (not shown) inserted in the outer core 110 and displaying a buried channel name 121, a management organization name 122 and a progress direction indication 123 on the surface, And a signboard for marking the buried pipeline 104 embedded in the ground of the road 102 by being adhered to the front surface of the boundary stone 103 or the building wall surface provided between the sidewalk 101 and the road 102 100);
The outer core 110 includes a first coupling groove 112 which is inserted into the lower inner side from the center of the upper face to insert the inner core 120 and a second coupling groove 112 which is located at the center of the bottom of the first coupling groove 112, The second coupling groove 113 is formed to have a two-step structure in which the NFC tag 130 is inserted into the lower side to form a smaller diameter than the first coupling groove 113;
An inner surface of the outer core 110 is provided with an attachment groove 114 having an uneven portion 115 to facilitate attachment to the front surface or the building wall surface of the barrier stone 103 while receiving an adhesive;
A polyurethane layer 118 is formed on the upper surface of the inner core 120 and the first coupling groove 112 is provided with a coupling portion 116 which is recessed at the lower end of the inner circumferential surface, Protects the inner core 120 and the NFC tag 130 while binding the polyurethane 118 and the outer core 110 as they flow into the first coupling groove 112 and the coupling portion 116 and are hardened;
The NFC tag 130 stores buried channel information and a server address of a management agency so that an operator confirms or records buried channel information when tagging with a smart phone or receives additional information on a buried channel provided by a server in real time To confirm;
The buried pipeline information may include a front distance distance 105 between the actual position of the buried pipeline 104 buried in the ground of the road 102 and the front surface of the boundary stone 103 or the sign 100 attached to the building wall surface, And includes a distance recorded by measuring the right gap distance 106;
The inner core 120 includes a straight line 123a, a branching inline 123b, a branching outline 123c, an elbow draw-in 123d, an elbow draw-in 123e, a tablet 123f, And the outer core 110 is inserted into the outer core 110 selectively.

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Accordingly, it is possible to easily grasp the information on the buried pipeline by the field worker, and to provide the buried pipe sign which is easy to install and maintain.

The present invention can significantly improve the structure of the buried marker in the conventional method of puncturing on the road surface and then installing the buried marker on the road surface or the wall of the building, And maintenance can be easily performed, and the risk of damage and destruction can be minimized, and there is an advantage that the repacking of roads and sidewalks has a permanence to carry out the original purpose without damaging or reinstalling the signs.

The information that can be observed with the naked eye by the operator displayed on the surface is displayed by the strong ultraviolet ray and the screen printing, and the surface is made of the polyurethane material It is possible to maintain the visibility and the durability of the sign, and to provide the same function as the waterproofing, so that the life of the sign can be semi-permanently maintained.

In addition, the NFC tag inserted inside the buried pipe sign includes more specific information about the buried pipe as well as a URL that can be connected to the server of the management institution, so that the field worker can easily obtain the information about the buried pipe Additional information exceeding the range that can be accommodated in the memory of the NFC tag can be easily grasped and the smooth and efficient progress of the field work can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view according to an embodiment of a buried pipe sign of the present invention; Fig.
2 is a front view according to an embodiment of the buried pipe sign of the present invention.
3 is an exploded perspective view of an embedment pipe sign according to an embodiment of the present invention.
4 is a cross-sectional view taken along the line AA in Fig.
5 is a cross-sectional view according to another embodiment of the buried pipe sign of the present invention in Fig.
6 is an illustration showing six kinds of progress direction indications 123a to 123f displayed on the internal core 120 according to the embodiment of the buried pipe sign of the present invention.
7 is a perspective view exemplifying the back surface of the outer core 110 of the buried pipe sign of the present invention.
Fig. 8 to Fig. 9 are views for explaining the use state of the buried pipe sign of the present invention. Fig.
10 is an exemplary view showing a conventional buried pipe marker.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the construction and operation of a buried pipe sign according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a buried pipe sign according to an embodiment of the present invention, FIG. 2 is a front view of a buried pipe sign according to an embodiment of the present invention, FIG. 3 is an exploded perspective view according to an embodiment of the buried pipe sign of the present invention, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 2, FIG. 5 is a cross-sectional view of a buried pipe sign according to another embodiment of the present invention, FIG. 7 is a perspective view illustrating the back surface of the outer core 110 of the buried pipe sign of the present invention, and FIGS. 8 to 12 are views showing six kinds of progress direction marks 123a to 123f, 9 is a view showing the state of use of the buried pipe signboard of the present invention, and FIG. 10 is a view showing an example of a conventional buried pipe marker.

The buried pipeline sign to which the technique of the present invention is applied is constituted by a sign that is easily installed by being adhered to the front surface of the barrier pavement 103 or the building wall surface between the sidewalk 101 and the road 102, It is noted that this is a technique relating to a buried pipe sign capable of easily grasping information on various buried pipelines 104 buried in the burial pipe 104 and being semi-permanently usable for easy installation and maintenance.

1 to 3, an external core 110 to be attached to a boundary stone 103 or a wall surface, an external core 110 to be inserted into the external core 110, An NFC tag 130 for storing concrete information about the pipeline 104 and an internal core 120 for protecting the NFC tag 130 and displaying basic information about the buried pipeline 104. [

The outer core 110 has a circular plate-like surface on which a guide plate 111 and a marking direction 117 for reference to the branching direction of the buried channel 104 are depressed at an engraved surface, And a second coupling groove 113 formed at a bottom surface of the first coupling groove 112 and having a diameter smaller than that of the first coupling groove 112.

A field worker displays an engraved method of confirming or recording information on the buried channel from the NFC tag 130 inserted in the outer core 110 using his own smartphone, And the possibility of abrasion due to contact is significantly reduced.

In addition, the visibility can be further increased by filling paints or pigments in the intaglio of the guide post 111. If the brand 100 of the sign 100 and the brand name of the sign 100 together with the guide post 111 are additionally displayed in an engraved form, This can be a maintenance benefit.

On the other hand, the sign board direction 117 is configured to be associated with a progress direction indicator 123 displayed on the surface of the internal core 120, which will be described later.

That is, the progress direction indicator 123 displayed on the surface of the inner core 120 does not cause a problem in the installation of the sign 100 when the buried pipeline 104 is embedded in parallel along the boundary stones 103 When the buried pipeline 104 is branched or elbow-drawn and drawn out with respect to the mark 100, the signboard 100 should be attached to the buried pipeline 104 by specifying the branching direction of the buried pipeline 104. Accordingly, in order to solve this problem, a sign board direction 117 indicating a reference direction is displayed on the upper side of the first engagement groove 112 with an engraved mark. Therefore, the straight line 123a, the branching inline 123b, the branching outline 123c, the elbow draw-in 123d, the elbow draw-in 123e, the tablet 123f in the forward direction display 123, And the buried pipeline 104 is marked.

The first coupling groove 112 is formed by extending a predetermined depth inward from the surface of the outer core 110. The inner core 120 is inserted into the first coupling groove 112 to protect the NFC tag 130 inserted into the second coupling groove 113.

4 to 5, the first coupling groove 112 is provided with a coupling portion 116 formed in the shape of a groove or an inclined surface which is recessed at the lower end of the inner peripheral surface. Therefore, after inserting the inner core 120 into the first engaging groove 112, the polyurethane 118, which is finished on the surface of the inner core 120 and provides waterproof and coating functionalities, is in a state of fluidity The polyurethane 118 is prevented from being peeled off from the outer core 110 due to the fact that the polyurethane 118 flows into the first coupling groove 112 and the coupling portion 116 and is filled and solidified after progressing hardening, The core 120 and the NFC tag 130 are further provided with a function of protecting them.

The second coupling groove 113 is formed at a predetermined depth in the bottom surface of the first coupling groove 112 so that the NFC tag 130 is inserted therein. In addition to the NFC tag 130, a predetermined buffering or protecting means is additionally inserted It is also acceptable.

Meanwhile, the corners of the outer core 110 are treated by rounding or squeezing to minimize external contact or damage or detachment of a road cleaning vehicle or a general vehicle due to the impact of the wheel during parking.

The inner core 120 is formed into a circular plate having an outer diameter corresponding to the first coupling groove 112 and is inserted into the inner core 120. The inner pipe 120 has a buried pipe name 121, Or by screen printing.

The name of the buried pipe 121 is a type of the buried pipe 104 buried in the ground of the road 102. The buried pipe 121 may be a water pipe, And so on.

The management organization name 122 indicates the management of the buried pipeline 104 and the buried pipeline sign 100, and the notation of the government agency, municipality, or general company, which is the supervisor, by a character or a symbol mark.

The direction indicator 123 indicates the direction in which the buried pipeline 104 buried in the ground travels at a position spaced a certain distance from the mark 100 as shown in FIG. 6 Likewise, visibility is displayed differently according to the progress direction by using arrows directed toward all directions.

The buried channel name 121, the management organization name 122, and the progress direction mark 123 displayed on the surface of the internal core 120 may be vulnerable to sunlight and ultraviolet rays, Or displayed by screen printing.

In addition, the upper surface of the inner core 120 is finished with polyurethane 118 to provide a waterproof and coating function.

The finish of the polyurethane 118 is resistant to water and has chemical resistance and prevents yellowing. As described above, the polyurethane 118 is filled with a fluid polyurethane It is possible to protect the NFC tag 130 and the inner core 120 while preventing the polyurethane 118 from being peeled off from the outer core 110 as the curing is performed after the core 118 is filled, .

The NFC tag 130 is inserted into the second coupling groove 113 of the external core 110 and stores the embedded pipe information and the server address of the management agency so that an operator can tag or tag the embedded pipe information with a smart phone Or to provide additional information in real time.

The NFC tag 130 is a type of electronic tag that transmits data between both terminals at a distance of about 10 cm as a non-contact type short-range wireless communication module. Since most of the smartphones commonly used in the past are equipped with the NFC tagging function, the field worker can use the smartphone to place the tag in the NFC tag 130 There is an advantage that the stored buried pipe information can be confirmed or recorded.

The buried channel information stored in the NFC tag 130 includes various information useful for on-site operations such as the depth of the buried channel 104, the pipe material, the pipe diameter, the turner, the capacity, the management department, and emergency contact.

Particularly, the actual position of the buried pipe 104 buried in the ground of the road 102 and the distance between the front surface of the barrier seat 103 or the signboard 100 attached to the building wall surface are recorded in the buried pipe information.

When the signboard 100 is attached to the boundary stone 103 located on the front face of the actual location where the buried pipeline 104 is buried or the wall surface of the building, the distance between the signboard 100 and the buried pipeline 104 105 and recorded on the boundary wall 103 at a position deviated to the left or right due to the inability to place the sign 100 on the front face of the actual position in which the buried pipeline 104 is buried, The front distance distance 105 and the left and right distance distance 106 between the sign 100 and the buried pipeline 104 are recorded and stored at the same time.

Also, in case of exceeding the storage capacity of the NFC tag 130 or confirming information related to various buried pipes more than recorded information, an address (URL) capable of accessing a server of the management institution is stored, So that the user can access the server in real time to check additional information.

That is, the range of information on the buried pipeline 104 that can be provided to the operator through the sign 100 of the present invention is the name of the buried pipeline 121, management organization name 122, The information on the actual burial location and the buried pipeline of the concrete buried pipeline 104 as described above stored in the NFC tag 130 and the information on the buried pipeline on the server via the URL, There is an advantage that the range can be extended to additional information by connection.

8 to 9, the sign 100 according to the present invention includes the outer core 110, the inner core 120, and the NFC tag 130, An actual location of the buried pipeline 104 buried in the ground of the road 102 and an actual position of the buried pipeline 104 attached to the front surface or the building wall surface of the boundary stone 103 provided between the roads 102 with adhesive or double- The information is configured to be labeled.

In the preferred embodiment of the present invention shown in FIGS. 8 to 9, the sign 100 is attached to the bottom of the boundary stone 103, that is, at a position spaced apart from the ground surface by 50 mm, Respectively.

Since the adhesive can be applied in such a manner that an adhesive, a double-sided tape, an epoxy resin, a bond or the like is selected and attached or applied along the mounting surface of the mark 100, it is not necessary to specify the kind.

7, an attachment groove 114 is formed in the back surface of the outer core 110 and an uneven portion 115 is further formed in accordance with the type of the adhesive, 103 or the wall surface of the building.

A method of marking a buried pipeline for marking a buried pipeline 104 buried in the ground of a road 102 using the buried pipeline sign 100 to which the technique of the present invention is applied will be described as follows.

The mark 100 includes an outer core 110 having a disk shape as described above, an inner core 120 inserted into the first coupling groove 112 formed in the outer core 110, And an NFC tag 130 inserted into the second coupling groove 113 formed therein.

The field worker can perform the following steps from the signboard 100 to install the apps S10, the information recording step S20, the installation step S30, the observation step S40, the tagging step S50, The pipeline information confirmation step (S60), and the supplementary information confirmation step (S70), the information on the buried pipeline (104) can be recorded, confirmed and managed.

When the operator tags the signboard 100 using his / her smartphone, the app install step S10 automatically registers the address of the play store in which the app is registered for information recording or identification when the signboard 100 is produced And downloading and installing the app.

In the information recording step S20, an operator executes the application installed in the smart phone, selects an internal core 120 of a form suitable for the signboard direction 117 displayed on the external core 110, And writing the server address to the NFC tag 130.

The installing step S30 is a step of attaching the sign 100 that has undergone the storing step S20 to the front surface of the barrier seat 103 or the building wall surface provided between the sidewalk 101 and the road 102 with an adhesive .

The observation step S40 is a step of visually grasping the buried pipe name 121, the management organization name 122 and the progress direction mark 123 displayed on the surface of the internal core 120 by the field worker as an edged or screen- to be.

6, the progress direction indicator 123 is displayed on the basis of the sign 100 attached to the boundary stone 103 from the center of the internal core 120 in the direction of the buried pipeline 104, A buried pipe 104 running parallel to the boundary 103 on which the sign 100 is attached is oriented in the direction of the sign 117 displayed intentionally on the outer core 110, The T-shaped buried pipeline 104 branching to the boundary stones 103 and entering the boundary stones 103 is connected to the branch inlet 123b and the T-shaped buried pipeline 104 branching to the opposite side of the boundary stones 103 The elbow type buried pipeline 104 which enters the branch drawing 123c and the boundary stone 103 has an elbow draw-in 123d and an elbow type buried pipeline 104 which advances to the opposite side of the barrier- And the buried pipeline 104 forming a tangential line at the front of the boundary stone 103 is divided into six types, As shown, is made to the operator to easily grasp the direction of the buried pipe (104) in said observing step (S40).

The tagging step S50 is a step of tagging the NFC tag 130 using a smartphone according to a message 111 displayed on the surface of the outer core 110 by an operator.

The buried channel information checking step (S60) is a step of checking buried channel information stored in the NFC tag (130). In the buried pipeline information, the front distance 105 and the left and right spacing distance 106 between the buried pipeline 104 and the sign 100, the depth of the buried pipeline 104, the pipe material, the diameter, , Emergency contact, etc., and may include various information depending on the type of the buried pipeline 104.

The additional information checking step S70 is a step of accessing a server with a smartphone using the server address of the management agency stored in the NFC tag 130 and checking the additional information provided by the management agency in real time.

The buried pipe sign according to the present invention has the following advantages.

First, the signboard 100 of the present invention is manufactured in the same configuration regardless of the type of the buried pipe 104, with the outer core 110 made of a high-durability plastic material as a raw material different from the prior art, Since the inner core 120 is configured to be connected to the outer core 110 having the NFC tag 130 interposed therebetween according to the type of the buried channel 104 in the progress direction, The appropriate sign 100 may be selected and installed in consideration of only the buried pipe name 121 and the progress direction mark 123. [

In particular, information displayed on the surfaces of the outer core 110 and the inner core 120 has an economical advantage such as a reduction in manufacturing cost due to the mass production of a small item, and in particular, information displayed on the surfaces of the outer core 110 and the inner core 120, And the waterproof property is imparted by the polyurethane 118 finish while securing durability and service life of the sign 100 for a long period of time.

In addition, the sign 100 of the present invention can be removed from the conventional method of puncturing on a road surface on which automobiles or various types of walking articles run and then installed on the front surface of the boundary stone 103, It is advantageous in terms of installation that can be easily attached with an adhesive on the surface of the glass plate, and the cost for installation can be drastically reduced.

Therefore, the risk of breakage or damage of the sign 100 can be remarkably reduced, thereby prolonging the service life, and advantageously securing the safety of workers put into installation and management.

Further, when the signboard 100 is managed, for example, when excavating or repacking the road 102 or the sidewalk 101, the conventional signboard is removed or damaged, whereas the signboard 100 of the present invention is installed once Even if the boundary stone 103 is replaced, the existing signage 100 is separated from the boundary stone 103 and attached to the boundary stone 103 to be newly installed, as long as the boundary stone 103 or the building wall surface is not replaced or broken down. Further, in addition to the basic information on the buried pipeline 103, the additional information can be integratedly processed by the management organization.

In addition, when it is required to change the name of the buried pipe line 121, the name of the management institution 122 and the direction of the progress indicator 123 displayed on the internal core 120, that is, The depth of buried pipe or the diameter of the pipe may be changed. In this case, the signboard 100 or the signboard 100 adhered to the wall surface may be easily removed and replaced with another signboard 100 .

Therefore, the buried pipe signboard of the present invention has a variety of advantages in all aspects of manufacture, installation and maintenance as compared with the prior art, and thus it is expected that the buried pipe signboard will be highly industrially used in the future.

100: Sign 101: Press
102: Road 103:
104: Pipeline 105: Front separation
106: side separation distance 110: outer core
111: guide letter 112: first coupling groove
113: second coupling groove 114: attachment groove
115: concave / convex portion 116:
117: Direction of the sign 118: Polyurethane
120: internal core 121: buried pipe name
122: Name of management organization 123: Show direction of progress
130: NFC tag

Claims (5)

An outer core 110 formed on the surface of the outer core 110 and having a guiding text 111 and a sign board direction 117 at an engraved surface, an NFC tag 130 inserted in the outer core 110 and storing buried channel information, And an inner core 120 which is inserted into the outer core 110 and displays a buried pipe name 121, a management organization name 122 and a progress direction mark 123 on the surface thereof, 1. A sign board 100 for marking a buried pipeline 104 buried in the ground of a road 102 by being adhered to a front surface or a building wall surface of a boundary stone 103 provided between the road 102 and the building wall surface,
The outer core 110 includes a first coupling groove 112 which is inserted into the lower inner side from the center of the upper face to insert the inner core 120 and a second coupling groove 112 which is located at the center of the bottom of the first coupling groove 112, The second coupling groove 113 is formed to have a two-step structure in which the NFC tag 130 is inserted into the lower side to form a smaller diameter than the first coupling groove 113;
An inner surface of the outer core 110 is provided with an attachment groove 114 having an uneven portion 115 to facilitate attachment to the front surface or the building wall surface of the barrier stone 103 while receiving an adhesive;
A polyurethane layer 118 is formed on the upper surface of the inner core 120 and the first coupling groove 112 is provided with a coupling portion 116 which is recessed at the lower end of the inner circumferential surface, Protects the inner core 120 and the NFC tag 130 while binding the polyurethane 118 and the outer core 110 as they flow into the first coupling groove 112 and the coupling portion 116 and are hardened;
The NFC tag 130 stores buried channel information and a server address of a management agency so that an operator confirms or records buried channel information when tagging with a smart phone or receives additional information on a buried channel provided by a server in real time To confirm;
The buried pipeline information may include a front distance distance 105 between the actual position of the buried pipeline 104 buried in the ground of the road 102 and the front surface of the boundary stone 103 or the sign 100 attached to the building wall surface, And includes a distance recorded by measuring the right gap distance 106;
The inner core 120 includes a straight line 123a, a branching inline 123b, a branching outline 123c, an elbow draw-in 123d, an elbow draw-in 123e, a tablet 123f, Wherein the sixteen types of arrows are arranged in the outer core (110) and are selectively inserted into the outer core (110). delete delete delete delete

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