KR102165375B1 - Circular square forming mold - Google Patents

Abstract

The present invention relates to a mold for forming a circular square water pipe.
According to the present invention, in the forming of a circular square water channel by combining a cylindrical central mold into the central area of an outer mold assembled in a rectangular shape, the blocking mold constituting the central mold is moved to the top with a link-type blocking mold moving device. Blocks between the inclined cutting part of the holder and the inclined guide piece to cure the concrete product, and move it to the bottom so that the central mold can be smoothly separated (deformed) from the cured product, reducing the user's power and improving the quality of the product. Effects such as shortening the production period can be obtained.

Description

Circular square forming mold

The present invention relates to a mold for forming a circular square waterway pipe, and in detail, in the molding of a circular square waterway pipe by combining a cylindrical center mold into the center area of an outer mold assembled at a rectangular angle, the center mold from the product cured inside the mold It is configured so that the demoulding can be smoothly performed.

In general, concrete waterway pipes are formed by separating the molds for waterway pipes vertically, horizontally, and then fastening them, pouring concrete, curing for a certain period of time, and then separating the molds, then square or circular concrete waterway pipes are formed.

Prior art for forming such a concrete waterway pipe is provided with Registration Patent No. 10-1157419 (name of the invention: mold device for forming square waterway pipe) and Registration Patent No. 10-1642689 (name of invention: mold for vibration circular tube molding). Has become.

This prior art mold apparatus for forming a square waterway pipe assembles an external mold and an internal mold, and in the molding of a square waterway pipe that is formed by pouring concrete between them, it is possible to remove the central mold from the cured product inside the mold. In order to do this, the blocking mold can be easily demolded from the center mold constituting the center mold by using a demoulding device, and the center mold is a spacing control means, and by adjusting the spacing of the tapered cut part of the center mold, The user's power is low, and the product quality can be improved and the manufacturing time of the product can be shortened.

However, this prior art is a demoulding device consisting of a moving bolt and a nut to demold the center mold from the product cured inside the mold, and a turn buckle type to adjust the spacing of the center mold to facilitate the demoulding of the center mold. There is a problem in that the structure of each operation of the formed interval adjusting means using a tool is complicated and a lot of user power is consumed.

In addition, the vibrating circular tube molding mold of the prior art is a mold for forming a circular tube in which a base is molded and manufactured in a circular tube. By placing and connecting the circular pipe, the construction work on the site is simplified, and as the support is formed integrally with the circular pipe, the effect of significantly reducing the cost is provided.

However, this prior art is a demoulding device consisting of a moving bolt and a nut to demold the center mold from the product cured inside the mold, and a turn buckle type to adjust the spacing of the center mold to facilitate the demoulding of the center mold. The structure of each operation of the formed spacing control means using a tool is complicated and the user's power is consumed, and the outer mold is composed of an upper mold, a lower mold, a lower frame, and front and rear molds, so that the assembly is complex. In particular, as a structure in which the front and rear molds are coupled and finished as a moving means to the lower frame, there is a problem that it is not easy to assemble and operate the outer mold.

The present invention was conceived to solve such a conventional problem, and an object of the present invention is to form a central mold in the molding of a circular square waterway pipe by combining a cylindrical center mold into a central area of an outer mold assembled in a rectangular shape. By moving the blocking mold to the top with a link-type blocking mold moving device, the concrete product is cured by blocking the inclined cutting part of the cylindrical holder and the inclined guide piece, and the central mold can be smoothly separated from the cured product by moving it to the bottom. It is to provide a mold for forming a circular square waterway pipe configured to be capable of.

The problem solving means of the present invention for achieving such an object includes an outer mold consisting of a bottom mold, a left and right mold, and a front and rear mold; A central mold detachably coupled to the inside of the central region between the front and rear molds of the outer mold; In the circular square molding mold composed of vibration means installed in the lower area of the outer mold, the center mold is the same as a cylindrical holder having elasticity by cutting horizontally with an inclined cutting portion inclined downward at the outer periphery, and the inclined cutting portion downward. A core consisting of an inclined guide piece fixed by maintaining an inclination angle and a plurality of vertical reinforcing pieces vertically fixed to the inner circumferential surface of the cylindrical holder and each formed with an inclined moving hole; A blocking mold for selectively blocking between the inclined cutting portion and the inclined guide piece of the cylindrical holder by being movably coupled to the upper and lower portions through the inclined moving hole of the vertical reinforcing piece; It is provided on the inner circumferential surface of the cylindrical holder, the blocking mold and the vertical reinforcing piece region, and configured as a blocking mold moving device for moving the blocking mold up and down in order to block between the inclined cutting portion and the inclined guide piece.

In the mold for forming a circular square waterway pipe according to the present invention, in the forming of a circular square waterway pipe by combining a cylindrical center mold into the center area of the outer mold assembled in a rectangular shape, the blocking mold constituting the center mold is moved to the link-type blocking mold. As a device, it is moved to the upper part to block between the inclined cutting part of the cylindrical holder and the inclined guide piece to cure the concrete product, and by moving it to the lower part, the central mold can be smoothly separated (deformed) from the cured product. It costs less and can improve the quality of the product and shorten the manufacturing period.

1 is a perspective view showing the overall structure of a mold for forming a circular square water pipe according to the present invention.
2 and 3 are front and rear views of a mold for forming a circular square tube according to the present invention.
Figure 4 is an exploded perspective view showing the outer mold of the mold for forming a circular square water pipe according to the present invention.
5 to 7 are configuration diagrams showing a central mold of a mold for forming a circular square tube according to the present invention.
FIG. 8 is an enlarged configuration diagram showing part "A" of FIG. 5.
9 is a block diagram showing a block mold of the mold for forming a circular square tube according to the present invention.
Figure 10 is a block diagram showing a rotational link of the circular square tube molding mold according to the present invention.
Figures 11a to 11d is a state diagram of the main part of the circular square tube molding mold according to the present invention.
12 is a block diagram of a tube manufactured in a mold for forming a circular square tube according to the present invention.

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

In the accompanying drawings, FIG. 1 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 diagrams of a mold for forming 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 diagrams showing a central mold of the mold for forming a circular square pipe according to the present invention.

As shown in Figs. 1 to 7, the mold for forming a circular square waterway pipe according to the present invention includes an outer mold 10 that is assembled and maintained at a rectangular angle so that the upper part is opened; The outer mold 10 is made of a central mold 30 that is detachably coupled to the inside of the central area, and a vibration means 120 is installed in the lower area of the outer mold 10 to evenly inflow concrete pouring into the interior. .

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

At this time, the front and rear circular flanges 17 and 18 are horizontally fixed to the front and rear surfaces of the front and rear molds 15 and 16 with assembly through holes 17a formed in communication with the assembly holes 15a. 30) is coupled to protrude, and the arcuate protrusion piece 19 is fixed to the outer surface of the assembly hole 15a of the left or right mold to form a packing insertion groove 19a into which the packing is inserted after curing the concrete.

The locking means 20 includes a pair of fixing pieces 22 protruding from the left and right molds 12 and 13; A pair of rotating fixing pieces 24 provided at the same height on the front and rear molds 15 and 16 to correspond to the fixing pieces 22; A rotation length bolt 26 provided with one end to be rotatable between the rotation fixing pieces 24; It is fastened to the rotating bolt 26 and is composed 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.

The center mold 30 is detachably coupled between the assembly hole 15a of the front and rear molds 15 and 16 and the assembly hole 17a of the front and rear circular flanges 17 and 18, and the outer periphery The inclined cutting part 41 inclined downward is horizontally cut to form a cylindrical holder 42 having its own elasticity, and the inclined guide pieces 43 and 44 fixed by maintaining the same inclination angle downward of the inclined cutting part 41 And, a core 40 made of vertical reinforcing pieces 46 and 47 each of which is fixed to correspond to the inner circumferential surface of the cylindrical holder 42 at equal intervals vertically, and each having an inclined moving hole 45 formed thereon; The vertical reinforcement pieces 46 and 47 are coupled to be movable up and down through the inclined moving holes 45 to selectively between the inclined cutting portions 41 of the cylindrical holder 42 and the inclined guide pieces 43, 44 A blocking mold 50 for blocking; It is provided on the inner circumferential surface of the cylindrical holder 42 and the blocking mold 50 and the vertical reinforcing pieces 46 and 47 to block between the inclined cutting part 41 and the inclined guide pieces 43 and 44. ) Consists 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 and 52 formed to be inclined to be in close contact with the inclined guide pieces 43 and 44 and the inclined pieces 51 and 52 in the width direction of the upper surface. A horizontal blocking material consisting of an upper curved finishing piece 53 formed to be curved to match the outer circumferential surface of the cylindrical holder 42, and a lower horizontal finishing piece 54 finished horizontally on both lower sides of the inclined pieces 51 and 52 (55) and; The upper fixing part 56 which is vertically fixed by maintaining a gap between the inner side of the inclined pieces 51 and 52 and the lower surface of the upper curved finishing piece 53, and the upper fixing part 56 integrally It is formed, the inclined pieces 51, 52 protruding outwardly, a plurality of first and second fixed protrusion pieces 58 consisting of a lower protrusion 57 having a central hole 57a and a side hole 57b to communicate with each other. ) (59) and; The inclined moving long holes 45 formed in the side holes 57b on both sides of the lower protrusions 57 constituting the first and second fixed protrusions 58 and 59 and the vertical reinforcing pieces 46 and 47 of the core 40 ) Are respectively coupled through a horizontal barrier material 55 and a plurality of guide rods 60 for guiding the movement to the upper and lower portions of the first and second fixing protrusions 58 and 59.

At this time, a plurality of vertical reinforcing pieces 61 are fixed in the longitudinal direction below the upper curved finish piece 53 between the first and second fixed protrusion pieces 58 and 59 to reinforce the strength.

The blocking mold moving device 70 is fixedly installed on the inner circumferential surface of the cylindrical holder 42 between the vertical reinforcing pieces 46 and 47 and has a plurality of first and second coupling holes 71 formed to communicate with each other. Vertical finishing pieces 72 and 73; The first and second lower links 75 and 76 formed in the lower portion of the hexagonal hole 74 so as to communicate with the coupling hole 71 between the first and second vertical finish pieces 72 and 73, and the first and second The lower link is connected to be rotatable with a rotation pin 77 between the upper part of the lower link 75 and 76, and the upper part is assembled to correspond to the central hole 57a of the first and second fixing protrusions 58 and 59 A plurality of rotational movable links 79 made of upper arm links 78 in which through holes 78a are formed; The upper arm link 78 is coupled through 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 to support the upper arm link 78 so as to be able to rotate upward. Hoedongjangbong (80) and; It is combined to prevent rotation through the coupling hole 71 between the first and second vertical finish pieces 72 and 73 and the hexagonal hole 74 of the first and second lower links 75 and 76, It consists of a movable rod 82 for moving the pivoting pin 77 and the upper pivoting rod 80 as the center and moving the blocking mold 50 upwardly.

At this time, when the movable rod 82 is made of a hexagon and rotated with a tool (not shown), it is 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 rotate around the upper pivot pin 77, and the upper arm link 78 rotates with the pivot pin 77 It rotates around the rotating long rod 80 to move the blocking mold 50 to selectively block between the inclined cutting part 41 and the inclined guide pieces 43 and 44.

On the other hand, between the horizontal blocking material 55 of the blocking mold 50 and the front and rear areas of the left and right molds 12, 13, the inclined cutting part 41 and the inclined guide pieces 43, 44 are blocked. A blocking retaining member 90 for maintaining 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 that is fixed to the front and rear regions of the left and right molds 12 and 13 and has a fitting hole 94 in communication with the upper and lower through holes 92 and 93; It consists of a fastening nut 97 that is fastened to the fastening bolt 96 inserted through the fitting 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 finish pieces 72 and 73 on both 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 the 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 described schematically.

As shown in Figs. 1 to 4, the left and right molds 12 and 13 provided to be rotatable on the rectangular floor mold 11 are vertically rotated, and then the front and rear surfaces of the floor mold 11 The molds 15 and 16 are rotated vertically.

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

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

Then, the cylindrical holder 42 of the center mold 30 is inserted through the assembly 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. When combined from one side to the other, the center mold 30 is moved to both sides inside the assembly 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. It is combined protrudingly.

In this state, as shown in FIG. 11A, when the tool is coupled to a moving long rod 82 made of a hexagonal shape constituting the blocking mold moving device 70 and rotated in a clockwise direction, the first, 2 As the moving long rod 82 is coupled to the hexagonal hole 74 of the lower link 75 and 76 to prevent rotation, the first and second lower links 75 and 76 are centered around the upper pivot pin 77. ) Rotates clockwise.

Accordingly, the first and second lower links 75 and 76 are connected so that the lower part is rotatably connected with a rotation pin 77 between the upper part, and the central hole 57a of the first and second fixed protrusions 58 and 59 The upper arm link 78, which is connected so that the upper part is rotatably connected by the upper rotating rod 80 through the assembly through hole 78a formed corresponding to the, is clockwise around the rotating pin 77 and the upper rotating rod 80. Will meet.

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

Accordingly, as the inclined pieces 51 and 52 of the horizontal barrier material 55 in close contact between the inclined guide pieces 43 and 44 move upward, the inclined cutting portion of the cylindrical holder 42 having its own elastic force ( As 41 is opened outward, the outer circumferential surface of the cylindrical holder 42 and the upper surface of the upper curved finish piece 53 coincide, so that the inclined cutting portion 41 between the inclined guide pieces 43 and 44 and the cylindrical holder 42 ) Is completely blocked.

Next, the fitting hole 94 of the fixing bracket 95 fixed to the front and rear areas of the left and right molds 12 and 13, and the upper curved finish piece 53 and the lower horizontal of the horizontal barrier 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 finished piece 54, and then fastening the fastening nut 97 to the fastening bolt 96, the oblique cut ( 41) and the inclined guide pieces 43, 44 to maintain the blocking by a blocking mold (50).

In this state, when a concrete poured product is injected into the mold for forming a circular square water pipe, the concrete poured material introduced into the inside due to the vibration of the vibration means 120 provided in the lower region of the outer mold 10 is the outer mold 10 While in close contact with the inner and outer circumference of the central mold 30, complete curing is achieved after an appropriate period of time (see FIGS. 2 and 3).

When the curing of the poured concrete is completed in this way, the mold for forming the circular square water pipe is demolded to separate the circular square water pipe.

Briefly describing the operation state thereof, as shown in FIG. 11C, the tightening force of the fastening nut 97 of the blocking member 90 is released, and the fitting hole 94 and the upper curved finish piece 53 of the fixing bracket 95 are released. ) And by separating the fastening bolt 96 through the upper and lower through-holes 92 and 93 of the lower horizontal finishing piece 54 to block between the inclined cutting part 41 and the inclined guide pieces 43, 44 The blocking force of the blocking mold 50 is released.

In this state, when the tool is coupled to a moving long rod 82 made of a hexagonal shape constituting the blocking mold moving device 70 and rotated in a counterclockwise direction, the first and second lower links 75 constituting the rotary moving link 79 ) As the movable rod 82 is coupled to the hexagonal hole 74 of the 76 to prevent rotation, the first and second lower links 75 and 76 are counterclockwise around the upper rotation pin 77 Will meet.

Accordingly, the first and second lower links 75 and 76 are connected so that the lower part is rotatably connected with a rotation pin 77 between the upper part, and the central hole 57a of the first and second fixed protrusions 58 and 59 The upper arm link 78, which is connected so that the upper part is rotatably connected by the upper rotating rod 80 through the assembly through hole 78a formed to correspond to the rotation pin 77 and the upper rotating rod 80 in a counterclockwise direction Will meet.

At the same time, as shown in FIG. 11D, the vertical side holes 57b formed on both sides of the lower protrusions 57 of the first and second fixing protrusions 58 and 59 constituting the blocking mold 50 and the core 40 Each of the guide rods 60 coupled through the inclined moving long holes 45 formed in the reinforcing pieces 46 and 47 move in a straight line obliquely downward along the inclined moving long holes 45.

Accordingly, the inclined pieces 51 and 52 of the horizontal barrier material 55 in close contact between the inclined guide pieces 43 and 44 move downward, so that between the inclined guide pieces 43 and 44 and the cylindrical holder 42 ), as the blocking mold 50 is separated from the inclined cutting part 41 of the cylindrical holder 42, the inclined cutting part 41 of the cylindrical holder 42 is retracted inward, so that the cylindrical holder 42 and the assembly hole 17a and the assembly hole 15a There is a space between them.

Thereafter, the handle 100 provided on the first and second vertical finishing pieces 72 and 73 on both inner circumferential surfaces of the cylindrical holder 42 is held and the central mold 30 is separated.

Then, the fastening force of the locking 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 removed from the rectangular bottom mold 11, ,When the rear molds 15 and 16 are sequentially rotated downward and separated, a circular hole is formed in the central area inside, an arcuate packing insertion groove 19a is formed on one end, and the outer circumferential surface is square. The maintained product, that is, the concrete waterway pipe 130 is molded (see Fig. 12).

In the above, a preferred embodiment according to the present invention has been mainly described, but the technical idea 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 to achieve the same object and effect. Can be.

10: outer mold 11: bottom mold
12,13: left, right mold 15,16: front, rear mold
30: center mold 40: core
41: oblique cut 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 end piece
55: horizontal barrier 56: upper fixing
57: lower protrusion 57a: central hole
57b: side hole 58,59: first and second fixed protrusions
60: guide rod 70: blocking mold moving device
71: joint hole 72,73: 1st and 2nd vertical finish
74: hexagonal hole 75,76: 1st, 2nd lower link
77: pivot pin 78: upper arm link
78: rotating moving link 80: upper rotating rod
82: moving long rod 90: blocking retaining member
92,93: upper and lower through holes 94: fitting through holes
95: fixing bracket 96: fastening bolt
97: tightening nut

Claims (5)

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

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