KR20200056752A - Circular square forming mold - Google Patents

Abstract

The present invention relates to a mold for forming a rounded square waterway pipe. According to the present invention, when forming the rounded square waterway pipe by combining a cylindrical center mold with a central region of an outer mold assembled in a rectangular shape, a blocking mold constituting the center mold is moved upward as a link-type blocking mold moving device to block a gap between an inclined cut unit of a cylindrical holder and an inclined guide piece to cure a concrete product, and is moved downward so that the center mold can be smoothly separated from the cured product, thereby assisting a user, improving product quality, and shortening a manufacturing period.

Description

Circular square forming mold {Circular square forming mold}

The present invention relates to a mold for forming a rounded square waterway pipe, and in detail, in the molding of a rounded square waterway pipe by combining a cylindrical central mold with a central region of an outer mold assembled in a rectangular shape, a center mold from a product cured inside the mold It is configured to facilitate the demolding of.

In general, concrete water pipes are separated from the molds for water pipes up, down, left, and right, and then fastened. Then, concrete is poured, cured for a certain period of time, and then molded to separate the molds.

Prior art for forming such a concrete waterway pipe is provided with Patent No. 10-1157419 (Invention name: Molding device for square waterway pipe molding) and Patent No. 10-1642689 (Invention name: Vibration circular tube molding mold). Is becoming.

The mold device for forming a square water pipe of the prior art is formed in a square water pipe formed by assembling an external mold and an inner mold and pouring concrete into the mold, thereby removing the mold from the product cured inside the mold. To do this, the blocking mold can be easily demolded from the central mold constituting the central mold using the demoulding device, and the central mold can be easily demolded by adjusting the interval of the tapered cut portion of the central mold as an interval adjusting means. It is possible to obtain effects such as improving the quality of a product and shortening the production time of a product with less user power.

However, this prior art is a turn-buckle type for adjusting the spacing of the center mold so as to facilitate the demolding of the center mold and the demolding device consisting of a moving field bolt and a nut to demold the central mold from the product cured inside the mold. There is a problem in that the structure for operating the space adjusting means made by each using a tool is complicated and the user's power is consumed a lot.

In addition, the mold for forming a vibrating circular tube of the prior art is a mold for forming a circular tube in which a base is molded and manufactured. As the base is integrally molded on the outer circumferential surface of the circular tube, the base is stably raised on the construction surface. Laying and connecting the circular pipes made construction work easier in the field, and as the base is integrally formed with the circular pipes, a significant reduction in cost is provided.

However, this prior art is a turn-buckle type for adjusting the spacing of the center mold so as to facilitate the demolding of the center mold and the demolding device consisting of a moving field bolt and a nut to demold the central mold from the product cured inside the mold. The structure of operating the space adjustment means using a tool is complicated, the user's power is consumed, and the outer mold is composed of the upper mold, the lower mold, the lower frame, and the front and rear molds, making the assembly as complicated. In particular, as the structure in which the front and rear molds are combined and closed as a moving means on the lower frame, there is a problem that assembly and operation of the external molds are not easy.

The present invention has been devised to solve such a conventional problem, and the object of the present invention is to form a central mold in the formation of a circular rectangular waterway tube by combining a cylindrical central mold with a central region of an outer mold assembled in a rectangular shape. By moving the blocking mold to the upper part with the link-type blocking mold moving device, it blocks between the inclined cutting part of the cylindrical holder and the inclined guide piece to cure the concrete product, and moves to the lower part to smoothly separate the center mold from the cured product. It is to provide a mold for forming a circular square waterway pipe configured to be.

The problem solving means of the present invention for achieving the above object is an outer mold consisting of a bottom mold, left and right molds and front and rear molds; A center mold that is detachably coupled inside the center region between the front and rear molds of the outer mold; In the mold for a circular square forming composed of vibration means installed in the lower region of the outer mold, the central mold is formed by cutting the inclined cutting portion inclined downward on the outer periphery horizontally and the cylindrical holder having elastic force, and the same for the inclined cutting portion downward. A core consisting of a plurality of vertical reinforcing pieces fixed to the inner circumferential surface of the cylindrical holder and a fixed inclined guide piece maintained with an inclined angle, each of which is formed with an inclined movement hole; A blocking mold for selectively blocking the inclined cutting portion of the cylindrical holder and the inclined guide piece by being movably coupled up and down through the inclined movement hole of the vertical reinforcing piece; It is provided in the cylindrical holder inner circumferential surface and the blocking mold and the vertical reinforcing piece area, characterized in that it consists of a blocking mold moving device for moving the blocking mold up and down to block between the inclined cutting portion and the inclined guide piece.

The mold for forming a round square waterway pipe according to the present invention is a central area of an outer mold assembled in a rectangular shape. In the molding of a round square waterway tube, the blocking mold constituting the center mold is moved into a link type blocking mold. As a device, it moves to the upper part to block the inclined cutting part of the cylindrical holder and the inclined guide piece to cure the concrete product, and moves to the lower part to smoothly separate (deform) the center mold from the cured product. It is less expensive and can improve the quality of products and shorten the production period.

1 is a perspective view showing the overall structure of a mold for forming a circular square waterway pipe according to the present invention.
2 and 3 is a front and rear configuration of the mold for forming a circular square tube according to the present invention.
Figure 4 is an exploded perspective view showing an outer mold of a mold for forming a circular square waterway pipe according to the present invention.
5 to 7 is a block diagram showing a central mold of a mold for forming a circular square tube according to the present invention.
8 is an enlarged configuration diagram showing a portion “A” in FIG. 5.
9 is a block diagram showing a mold of a mold for forming a circular square tube according to the present invention.
10 is a block diagram showing a rotation movement link of a mold for forming a circular square tube according to the present invention.
11A to 11D are operational views of main parts of a mold for forming a circular square tube according to the present invention.
12 is a block diagram of a tube produced in a mold for forming a circular square tube according to the present invention.

Hereinafter, specific contents for carrying out the present invention will be described with reference to the accompanying drawings.

1 of the accompanying drawings is a perspective view showing the overall structure of a mold for forming a circular square water pipe according to the present invention, and FIGS. 2 and 3 are front and rear configuration views of a mold for molding a circular square pipe according to the present invention, 4 is an exploded perspective view showing an outer mold of a mold for forming a circular square water pipe according to the present invention, and FIGS. 5 to 7 are configuration views showing a central mold of a mold for forming a circular square pipe according to the present invention.

1 to 7, the mold for forming a circular square waterway pipe according to the present invention includes an outer mold 10 which is assembled and maintained in a rectangular shape such that the upper part is opened; The outer mold 10 is made of a central mold 30 that is detachably coupled inside the central region, and a vibration means 120 is installed in the lower region of the outer mold 10 to uniformly introduce concrete pouring into the interior. .

The outer mold 10 includes a bottom mold 11 formed by maintaining a rectangular shape; Left and right molds 12 and 13 provided to be rotatable vertically on both sides in the longitudinal direction of the bottom mold 11; The left and right molds 12 and 13 are provided to be rotatable vertically in the front and rear directions, and correspondingly, assembly holes 15a to which both sides of the center mold 30 are coupled are formed to correspond, and as a locking means 20 , Right mold (12) (13) and the front and rear molds (15, 16) are assembled and maintained in a rectangular parallelepiped so that the upper part is open.

At this time, the front and rear circular flanges 17 and 18 are formed horizontally and fixed to the front and rear of the front and rear molds 15 and 16 so that the assembly through holes 17a are formed to communicate with the assembly holes 15a. 30) is coupled to protrude, the left or right molded hole (15a) of the arch-shaped projecting piece (19) is fixed to the outer surface of the concrete after curing the packing insertion groove (19a) into which the packing is inserted is molded.

The locking means 20 includes a pair of fixed pieces 22 protruding from the left and right molds 12 and 13; A pair of rotating fixed pieces 24 provided at the same height in the front and rear molds 15 and 16 to correspond to the fixed pieces 22; A rotating length bolt 26 having one end rotatably provided between the rotating fixing pieces 24; It is made of a lock nut 28 for assembling the left and right molds 12 and 13 and the front and rear molds 15 and 16 so that the square is maintained by being fastened to the pivoting bolt 26.

The center mold 30 is detachably coupled between the assembling holes 15a of the front and rear molds 15 and 16 and the assembling through holes 17a of the front and rear circular flanges 17 and 18, and is outer peripheral. The inclined cutting portion 41 inclined downward is cut horizontally to form a cylindrical holder 42 having its own elasticity, and the inclined guide piece 43, 44 fixed by maintaining the same inclined angle below the inclined cutting portion 41 And, the core 40 made of a vertical reinforcing piece (46) (47), which is fixed to correspond to each other by maintaining an equal interval perpendicular to the inner circumferential surface of the cylindrical holder (42); Selectively between the inclined cutting portion 41 and the inclined guide piece 43, 44 of the cylindrical holder 42 by being movably coupled up and down through the inclined movement hole 45 of the vertical reinforcing piece 46, 47. A blocking mold 50 for blocking; Cylindrical holder 42 is provided in the inner circumferential surface and the blocking mold 50 and the vertical reinforcing piece 46 and 47, the blocking mold 50 to block between the inclined cutting portion 41 and the inclined guide piece 43, 44 ) Is made of a blocking mold moving device 70 for moving up and down.

The blocking mold 50 is seated and fixed on the inclined pieces 51, 52 and the inclined pieces 51, 52, which are inclined to be in close contact with the inner peripheral surface of the inclined guide pieces 43, 44, and the width direction of the upper surface A horizontal blocking material consisting of an upper curved closing piece 53 formed to be curved to coincide with the outer circumferential surface of the cylindrical holder 42, and a lower horizontal closing piece 54 horizontally closed on both lower sides of the inclined pieces 51 and 52. (55) and; The upper fixing part 56 fixed vertically by maintaining a gap between the inner surface of the inclined pieces 51 and 52 and the lower surface of the upper curved closing piece 53 and the upper fixing part 56 A plurality of first and second fixed protrusion pieces 58 formed of lower protrusions 57 formed, protruding to both sides of the inclined pieces 51 and 52, and communicating with the central hole 57a and the side hole 57b ) (59); Inclined movement long holes (45) formed in the side protrusions (57b) on both sides of the lower protrusions (57) constituting the first and second fixed protrusion pieces (58, 59) and the vertical reinforcement pieces (46) (47) of the core (40) ) Is made of a plurality of guide rods 60 to guide the movement to the upper and lower parts of the horizontal blocking material 55 and the first and second fixing protrusions 58 and 59, respectively.

At this time, a number of vertical reinforcing pieces 61 are fixed in the longitudinal direction to the lower portion of the upper curved closing piece 53 between the first and second fixing protrusion pieces 58 and 59 to reinforce the strength.

The blocking mold moving device 70 is fixedly installed by maintaining a gap on the inner circumferential surface of the cylindrical holder 42 between the vertical reinforcing pieces 46 and 47, and a plurality of first and second coupling holes 71 are formed in communication. Vertical closing pieces 72 and 73; The first and second lower links 75, 76 and the first and second hexagonal holes 74 are formed in the lower portion to communicate with the coupling holes 71 between the first and second vertical closing pieces 72 and 73. The lower link (75) (76) is pivotably connected to the lower part by a pivoting pin (77) between the upper parts, and assembled to correspond to the central hole (57a) of the first and second fixed protrusion pieces (58, 59) on the upper part. A plurality of pivoting movement links 79 formed of upper arm links 78 having through holes 78a; The upper through which the assembly through hole 78a of the upper arm link 78 and the central hole 57a of the first and second fixing protrusions 58 and 59 are coupled to support the upper arm link 78 so that it can be rotated upward. Hoedongjangbong 80; The rotation movement link is coupled to prevent rotation through the coupling hole 71 between the first and second vertical closing pieces 72 and 73 and the hexagonal hole 74 of the first and second lower links 75 and 76 (79) is made of a moving pin (82) for moving the pivot pin (77) and the upper pivoting rod (80) as a center, and moving the blocking mold (50) upward.

At this time, the movable rod 82 is made of a hexagon and rotated with a tool (not shown), coupled to the hexagonal hole 74 of the first and second lower links 75 and 76, and the first and second lower links 75 As the rotation of the 76 is prevented, the first and second lower links 75 and 76 are rotated around the upper rotation pin 77, and the upper arm link 78 is rotated and the upper rotation pin 77 By rotating around the rotating rod 80, the blocking mold 50 is moved to selectively block between the inclined cutting portion 41 and the inclined guide pieces 43, 44.

On the other hand, between the horizontal blocking material 55 of the blocking mold 50 and the front and rear regions of the left and right molds 12 and 13, the blocking portion 41 and the inclined guide pieces 43 and 44 are blocked. The blocking holding member 90 for maintaining the blocking of the blocking mold 50 is provided.

The blocking holding member 90 includes an upper through hole 92 and a lower through hole 93 formed to communicate with the upper curved finish piece 53 and the lower horizontal finish piece 54 of the horizontal blocking material 55; A fixing bracket 95 fixed to the front and rear regions of the left and right molds 12 and 13, and having a fitting through hole 94 in communication with the upper and lower through holes 92 and 93; It is made of a fastening nut 97 which is fastened to the fastening bolt 96 inserted through the fitting through hole 94 and the upper and lower through holes 92 and 93 to fix the blocking mold 50.

In addition, the first and second vertical finishing pieces 72 and 73 of the inner circumferential surfaces of the cylindrical holder 42 are provided with handles 100, respectively, and are used when the center mold 30 is taken out after concrete curing is completed.

The assembly and operation state of the mold for forming a circular square water pipe according to the present invention configured as described above will be schematically described.

1 to 4, the left and right molds 12 and 13, which are rotatably provided on the rectangular bottom mold 11, are rotated vertically, and then before and after the front and rear surfaces of the bottom mold 11, respectively. The molds 15 and 16 are rotated vertically.

Next, the pivoting bolt 26 of the locking means 20 is rotated to one side around the pivoting fixing piece 24 of the front and rear molds 15 and 16, and the left and right molds 14 and 15 are then rotated. After inserting between the fixing pieces 22, the locking nut 28 is sequentially fastened to the pivoting bolt 26 to assemble the outer mold 10 into a rectangular parallelepiped.

In this state, the blocking mold 50 is movably coupled between the inclined cutting portion 41 and the inclined guide pieces 43 and 44 of the cylindrical holder 42 constituting the core 40, and the blocking mold ( The center mold 30 to which the blocking mold moving device 70 is connected to move the 50) up and down is assembled.

Next, the cylindrical holder 42 of the center mold 30 is inserted through the assembly through holes 17a of the front and rear circular flanges 17 and 18 and the assembly holes 15a of the front and rear molds 15 and 16. When coupled from one side to the other, the center mold 30 is formed on both sides of the assembly through hole 17a of the front and rear circular flanges 17 and 18 and the assembly hole 15a of the front and rear molds 15 and 16. Combined to protrude.

In this state, as shown in FIG. 11A, when a tool is coupled to a moving rod 82 made of a hexagon forming a blocking mold moving device 70 and rotated in a clockwise direction, the first constituting the rotational moving link 79, 2 The first and second lower links 75 and 76 centered on the upper pivot pin 77 as the movable rod 82 is coupled to the hexagonal hole 74 of the lower link 75 and 76 to prevent rotation. ) Will rotate clockwise.

Accordingly, the first and second lower links 75 and 76 are pivotally connected to the lower portion between the upper portions of the lower links 75 and 76, and the central hole 57a of the first and second fixing protrusions 58 and 59 The upper arm link 78, which is rotatably connected to the upper part by the upper pivoting rod 80 through the assembly through hole 78a formed in correspondence with the pivot pin 77 and the upper pivoting rod 80, clockwise You will meet.

At the same time, as shown in Figure 11b, the vertical holes of the side holes 57b and the core 40 formed on both sides of the lower protrusion 57 of the first and second fixed protrusions 58 and 59 constituting the blocking mold 50. The guide rods 60 each coupled through the inclined movement long holes 45 formed in the reinforcing pieces 46 and 47 are moved linearly inclined upward along the inclined movement long holes 45.

Accordingly, as the inclined pieces 51 and 52 of the horizontal blocking material 55 in close contact between the inclined guide pieces 43 and 44 move upward, the inclined cut portion of the cylindrical holder 42 with its own elastic force ( 41), the outer circumferential surface of the cylindrical holder 42 and the upper surface of the upper curved closing piece 53 coincide with the inclined guide pieces 43, 44 and the inclined cutting portion 41 of the cylindrical holder 42. ) Is completely blocked.

Next, the fitting holes 94 of the fixing bracket 95 fixed to the front and rear regions of the left and right molds 12 and 13, the upper curved finishing piece 53 and the lower horizontal of the horizontal blocking material 55 After inserting the fastening bolt 96 through the upper through hole 92 and the lower through hole 93 formed in communication with the closing piece 54, the fastening nut 97 is fastened to the fastening bolt 96, and the inclined cutting portion ( 41) and the inclined guide pieces (43, 44) to maintain the blocking by the blocking mold (50).

In this state, when the concrete pouring is injected into the mold for forming a circular square water pipe, the concrete pouring introduced into the inside by the vibration of the vibration means 120 provided in the lower region of the outer mold 10 is the outer mold 10 It is in close contact with the inner periphery of the inner mold and the center mold 30, and complete curing is performed after a suitable period (see FIGS. 2 and 3).

When curing of the concrete pouring is completed in this way, the mold for molding the round square water pipe is demolded to separate the round square water pipe.

Referring to the operation state for this schematically, as shown in Figure 11c, release the fastening nut 97 fastening force of the blocking holding member 90, the fitting through hole 94 of the fixing bracket 95 and the upper curved finishing piece 53 ) And through the upper and lower through holes 92 and 93 of the lower horizontal closing piece 54 to separate the fastening bolt 96 to block between the inclined cutting portion 41 and the inclined guide piece 43, 44. The blocking force of the blocking mold 50 is released.

In this state, when the tool is coupled to the moving rod 82 made of a hexagon forming the blocking mold moving device 70 and rotated counterclockwise, the first and second lower links 75 constituting the rotating moving link 79 ) 76, the first and second lower links (75) (76) in the counterclockwise direction, as the moving rod (82) is coupled to the hexagonal hole (74) of 76 to prevent rotation. Will turn.

Accordingly, the first and second lower links 75 and 76 are pivotally connected to the lower portion between the upper portions of the lower links 75 and 76, and the central hole 57a of the first and second fixing protrusions 58 and 59 The upper arm link 78, which is rotatably connected to the upper part by the upper pivoting rod 80 through the assembly through hole 78a formed in correspondence with the pivot pin 77 and the upper pivoting rod 80, is counterclockwise. Will turn.

At the same time, as shown in Figure 11d, the vertical side of the side hole 57b and the core 40 formed on both sides of the lower protrusion 57 of the first and second fixed protrusions 58 and 59 constituting the blocking mold 50 The guide rods 60 each coupled through the inclined movement long holes 45 formed in the reinforcing pieces 46 and 47 are linearly moved inclined downward along the inclined movement long holes 45.

Accordingly, the inclined pieces 51 and 52 of the horizontal blocking material 55 in close contact between the inclined guide pieces 43 and 44 are moved downward, so that the inclined guide pieces 43 and 44 and the cylindrical holder 42 ) As the blocking mold 50 is detached from the inclined cutting portion 41, the inclined cutting portion 41 of the cylindrical holder 42 retracts inward, and the cylindrical holder 42 and the assembly through hole 17a and the assembly hole 15a Space is generated between them.

Thereafter, the handles 100 provided on the first and second vertical closing pieces 72 and 73 of the inner circumferential surfaces on both sides of the cylindrical holder 42 are gripped and the center mold 30 is separated.

Next, the fastening force of the lock nut 28 is released from the fixing screw 26 constituting the locking means 20, and then the left and right molds 12 and 13 are transferred from the rectangular bottom mold 11 to the front. When the rear molds 15 and 16 are sequentially rotated downward to separate them, a circular hole is formed in the central region inside, and an arc-shaped packing insertion groove 19a is formed on one end surface, and the outer circumferential surface is a square. The retained product, that is, the concrete water pipe 130 is molded. (See FIG. 12)

In the above, the preferred embodiment according to the present invention has been mainly described, but the technical spirit of the present invention is not limited thereto, and each component of the present invention is changed or modified within the technical scope of the present invention in order to achieve the same purpose and effect. It could be.

10: outer mold 11: bottom mold
12,13: Left and right mold 15,16: Front and rear mold
30: center mold 40: core
41: inclined cutting portion 42: cylindrical core
43,44: slope guide 45: slope movement
46,47: Vertical reinforcement piece 50: Blocking mold
51,52: Inclined piece 53: Upper curved finish piece
55: horizontal blocking material 56: upper fixing
57: lower protrusion 57a: central hole
57b: Side hole 58,59: 1st, 2nd fixed protrusion
60: guide rod 70: blocking mold moving device
71: Combined hole 72,73: 1st, 2nd vertical finishing
74: hexagonal hole 75,76: 1st, 2nd lower link
77: pivot pin 78: upper arm link
78: Hoedong Movement Link 80: Upper Hoejangjangbong
82: moving rod 90: blocking holding member
92,93: upper and lower through holes 94: fitting through
95: fixing bracket 96: fastening bolt
97: fastening nut

Claims (5)

An outer mold 10 consisting of a bottom mold 11, left and right molds 12 and 13 and front and rear molds 15 and 16; A center mold 30 which is detachably coupled inside the central region between the front and rear molds 15 and 16 of the outer mold 10; In the mold for a circular square forming consisting of the vibration means 120 installed in the lower region of the outer mold 10,
The center mold 30 is
The inclined cutting portion 41 inclined downward on the outer periphery is cut horizontally to form a cylindrical holder 42 having elastic force, and an inclined guide piece 43 fixed to the inclined cutting portion 41 by maintaining the same inclination angle ), The core 40 made of a plurality of vertical reinforcing pieces (46, 47), which are vertically fixed to the inner circumferential surface of the cylindrical holder (42), and each inclined movement hole (45) is formed;
Selectively between the inclined cutting portion 41 and the inclined guide piece 43, 44 of the cylindrical holder 42 by being movably coupled to the upper and lower parts through the inclined movement hole 45 of the vertical reinforcing piece 46, 47. Blocking mold 50 for blocking with;
The cylindrical holder 42 is provided on the inner circumferential surface and the blocking mold 50 and the vertical reinforcing pieces 46 and 47, so as to block the inclined cutting portion 41 and the inclined guide pieces 43 and 44. A mold for forming a circular square waterway pipe, characterized in that it comprises a cut-off mold moving device (70) for moving 50) up and down. According to claim 1, The blocking mold 50 is
The inclined piece 51, 52 formed to be in close contact with the inner circumferential surface of the inclined guide piece 43, 44, and fixed to the upper portion of the inclined piece 51, 52, so that the upper surface thereof coincides with the outer circumferential surface of the cylindrical holder 42 A horizontal blocking material 55 consisting of an upper curved closing piece 53 formed to be curved, and a lower horizontal closing piece 54 closed on both lower sides of the inclined pieces 51 and 52;
The upper fixing part 56 and the amount of the inclined pieces 51 and 52 that are vertically fixed by maintaining a gap between the inner surface of the inclined pieces 51 and 52 and the lower surface of the upper curved finishing piece 53 A plurality of first and second fixed protrusion pieces 58 formed integrally on the upper part of the upper fixing part 56 to protrude outward, and having a central hole 57a and a side hole 57b communicating with each other. ) (59);
The lower protruding portions 57 are respectively coupled through the inclined movement hole 45 formed in the vertical reinforcing pieces 46 and 47 of the side holes 57b on both sides and the core 40, and the horizontal blocking material 55 and the first, 2 A mold for forming a circular square waterway tube, characterized in that it consists of a plurality of guide rods (60) for guiding movement to the upper and lower parts of the fixed protrusion pieces (58, 59). According to claim 1, The blocking mold moving device 70 is
A plurality of first and second vertical closing pieces 72, 73, which are fixedly installed by maintaining a gap on the inner circumferential surface of the cylindrical holder 42 between the vertical reinforcing pieces 46 and 47, and are formed to communicate with each other. )and;
The first and second lower links 75, 76 and the first and second hexagonal holes 74 are formed in the lower portion to communicate with the coupling holes 71 of the first and second vertical closing pieces 72 and 73. The lower link (75) (76) is pivotably connected to the lower part by a pivoting pin (77) between the upper parts, and assembled to correspond to the central hole (57a) of the first and second fixed protrusion pieces (58, 59) on the upper part. A plurality of pivoting movement links 79 formed of upper arm links 78 having through holes 78a;
The upper through which the assembly through hole 78a of the upper arm link 78 and the central hole 57a of the first and second fixing protrusions 58 and 59 are coupled to support the upper rotation of the upper arm link 78. Hoedongjangbong 80;
The first and second vertical closing pieces 72 and 73 are coupled to prevent rotation through the coupling hole 71 and the hexagonal hole 74 of the first and second lower links 75 and 76 to prevent rotation. Characterized in that it consists of a moving pin (82) for moving the link (79) up and down around the pivot pin (77) and the upper pivoting rod (80), and moving the blocking mold (50) up and down. A mold for forming a rounded square waterway pipe. The method of claim 3, wherein the moving rod (82)
Circular quadrangular waterway tube characterized in that the first and second lower links 75 and 76 are prevented from being rotated in a hexagonal shape to be coupled to the hexagonal holes 74 of the first and second lower links 75 and 76. Mold for molding. The method according to claim 1, wherein the cut-off mold (50) of the horizontal barrier material (55) and the left and right molds (12, 13) between the front and rear areas of the inclined cutting portion (41) and the inclined guide piece (43) (44) ) Is provided with a blocking holding member 90 for maintaining the blocking of the blocking mold 50 to block between,
The blocking holding member 90
An upper through hole 92 and a lower through hole 93 formed in communication with the upper curved finish piece 53 and the lower horizontal finish piece 54 of the horizontal barrier material 55;
A fixing bracket 95 fixed to the front and rear regions of the left and right molds 12 and 13, and having a fitting through hole 94 in communication with the upper and lower through holes 92 and 93;
A circular square characterized by consisting of a fastening nut (97) fastened to the fastening bolt (96) inserted through the fitting through hole (94) and upper and lower through holes (92, 93) to fix the blocking mold (50). Mold for forming water pipes.

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