KR101862030B1 - Manufacturing Method of No Camber Precast Concrete Member - Google Patents

Abstract

The present invention proposes a method in which a member is formed in a downwardly rising shape (a shape of a deflecting member) in advance by a camber amount generated by a prestress so that the post-prestressing member can maintain smoothness, To a method of manufacturing a non-cambered prestressed concrete member capable of manufacturing a PSC member.
In one preferred embodiment of the present invention, (a) a pair of mold supports are fixed on top of a table of a predetermined size such that two or more of them are symmetrical with respect to a longitudinal center portion of the table, Fixing the table in such a manner that the distance from the upper surface of the table increases toward the direction end and the longitudinal center portion abuts the upper surface of the table; (b) a mold comprising a bottom plate of a predetermined size, a first side plate formed upward at both ends in the width direction of the bottom plate, and a second side plate formed upward at both longitudinal ends of the bottom plate, Placing the mold on the top of the mold so that the mold has a rising shape and then fixing it on the top of the table; (c) disposing a plurality of strands in the longitudinal direction in the mold; (d) pouring concrete into the mold; (e) after concrete curing, removing the table and mold to produce a concrete member in the form of a downwardly bulging form; (f) tensioning and fixing the strand of the concrete so that the concrete member rising in the downward direction bulges upward so as to maintain the smoothness.

Description

{Manufacturing Method of No Camber Precast Concrete Member}

The present invention relates to a method of manufacturing a non-cambered prestressed concrete member, and more particularly, to a method of manufacturing a non-cambered prestressed concrete member by fabricating a member in a downwardly rising shape (deflecting member shape) by a camber amount generated by a prestress, And a method for manufacturing a no camber prestressed concrete member capable of manufacturing a no camber PSC member that prevents camber from occurring in the PSC member.

Precast concrete members should be designed with a variety of complicated loads, such as self weight, work load, prestress, creep, shrinkage, and temperature load during production and construction, considering the fixed and live loads after completion.

 By providing an appropriate camber to prevent deflection occurring in the member against the above load, the structural safety, workability and usability of the member can be ensured. However, excessive camber is applied as a reverse moment load different from the design direction of the member, so cracking of the ash can occur. In addition, when the amount of camber generated in each member is different (uneven camber), a step is generated at the time of field construction to deteriorate the workability. In addition, since the field topping concrete is not filled with a uniform thickness, There is a problem that the design strength can not be secured.

Therefore, in each structure standard, the following limitations are set for camber and camber management is specified.

division Camber threshold PCI (US) 2 mm / m, Max = 19 mm KSCE (Korea) L (= 20m)? 15mm SCI (UK) Deflection of fixed load (including self-weight) Hara Sun (China) Fixed load + 1/2 Deflection of live load

Prestressed concrete (PSC) is a method to increase the bending strength by compensating the tensile stress generated inside the member by applying compressive force to the part where the tensile stress is generated in advance to compensate the remarkably small tensile strength of concrete.

As shown in FIG. 9, since the strand used in the prestressing is disposed at the lower end of the member section and designed as a tensile reinforcement, a backward moment M is generated according to the compressive force P and the eccentric distance e A camber (?) Is generated in the member.

Currently, PC factory in Korea does not have a quality certification system for production parts unlike the PC factory production environment (case: US PCI, NPCA factory certification, Japan JIS mark - product certification, etc.) It is true. Therefore, the members produced through the introduction of prestress are not constant in the amount of camber that occurs in each member depending on the production error, the working environment, the curing period, and the time of cutting the steel wire.

 In addition, the theoretical stiffness (EI) value of the member reflected in the current structure design is actually underestimated by the stiffness value of the member produced in the factory, and the camber amount of the PSC member is underestimated.

 Therefore, the domestic PC products have insufficient camber management, so that the amount of camber generated by each member is unstable, resulting in many problems such as cracking of PC member and occurrence of a step in the field construction.

As a background of the present invention, there is a patent registration No. 1273377 entitled " Device for preventing the PSC girder from rising "(Patent Document 1). In order to prevent tensile cracks from occurring on the upper surface due to the rise of the PSC girder due to the lapse of a predetermined period of time during the construction of the bridge, in order to mount the PSC girders 10a and 10b, A plurality of girder pedestals 100 disposed so as to be parallel to each other at regular intervals and maintained at the same height; A support pile 110 positioned at both ends of a girder support for receiving a center portion of the PSC girders 10a and 10b among a plurality of girder supports 100 and having a connection ring 112 installed at an upper portion thereof after penetrating into the ground; And a tensioning device 20 connected to the upper part of the central part of each of the PSC girders 10a and 10b and the lower end part of the adjacent PSC girder so as to apply a tensile force to the PSC girder 10a and 10b, .

However, in the background art, there is a problem in that it is complicated to manufacture and construct such as installing a separate anti-stoking device corresponding to the amount of camber on the girder.

Patent Registration No. 1273377 "PSC girder preventing device"

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a PSC member capable of preventing the camber of the PSC member from being maintained, Since the step between the members can be reduced, maintenance work can be eliminated and the workability can be improved. Also, since there is no step between the members due to the no camber member, it is easy to install the topping cone (concrete) The present invention provides a method of manufacturing a non-cambered prestressed concrete member which is structurally safe, can prevent cracks due to excessive camber, and is easy to load and store members due to furnace camber when a production member is stored in a factory, There is a purpose.

(A) fixing a pair of mold supports, each pair of which is symmetrical with respect to a longitudinal center portion, at two ends of the table in a longitudinal direction at the upper portion of a table of a predetermined size, And a center portion in the longitudinal direction is in contact with an upper surface of the table; (b) a mold comprising a bottom plate of a predetermined size, a first side plate formed upward at both ends in the width direction of the bottom plate, and a second side plate formed upward at both longitudinal ends of the bottom plate, Placing the mold on the top of the mold so that the mold has a rising shape and then fixing it on the top of the table; (c) disposing a plurality of strands in the longitudinal direction in the mold; (d) pouring concrete into the mold; (e) after concrete curing, removing the table and mold to produce a concrete member in the form of a downwardly bulging form; (f) tensioning and fixing the strand of the concrete so that the concrete member rising in the downward direction bulges upward so as to maintain the smoothness of the concrete member.

In addition, in the step (a), the mold support may include a pair of rails spaced a predetermined distance apart in the width direction on the upper portion of the table, a guide portion to be conveyed along the rail at the lower portion, A plurality of height adjusting devices including a height adjusting part formed to adjust the height of the pair of rails and a fixing plate formed on the top of the height adjusting part, And a support plate coupled to an upper portion of the fixed plate of the camber prestressed concrete member.

Also, in the step (a), the height adjusting part is a v-shaped upper arm which is hinged at the center part by a hinge and has a central part joined to the fixing plate, and a lower arm which is coupled to the center part by a hinge, A spindle nut formed at one side of a connecting portion of the upper arm and the lower arm and a spindle nut screwed to one end of the spindle nut and passing through the upper arm and the lower arm in the lateral direction, The upper cam and the lower cam being connected to each other by a screw screwed to a spindle nut formed on the other side of the connecting part of the lower upper arm and the lower arm.

Also, in the step (b), the mold is provided with a first side plate having a central convex portion formed to be convex downward.

Also, in the step (c), a stranded wire is arranged in a shape of a downward bulge from the inside of the mold using a fixing jig. The present invention provides a method for manufacturing a no-camber prestressed concrete member.

In addition, in the step (c), the fixing jig may include a fixing bar formed to cross the width direction of the mold and fixed to the mold, a supporting bar formed by the vertical lower portion of the fixing bar, And a fixed hook formed in an annular shape with an opening at the bottom thereof so that the strand of the strand is fitted and fixed to the fixed hook.

In the step (c), the fixing jig is composed of a vertical plate formed vertically and having through holes at regular intervals in the height direction, and a horizontal plate formed in the horizontal direction at the lower end of the vertical plate, And a rotating roller which is formed between the vertical plate and the vertical plate of the support member and is rotatably coupled by the fixing means so as to be fixed at a predetermined position of the lower plate of the mold, And the second camber prestressed concrete member is engaged with a lower portion of the rotating roller.

Also, in the step (c), the fixing jig may include a first fixing part formed in a ring shape with an opening at the bottom, a second fixing part extending from the top of the first fixing part and formed by a ring- Characterized in that the stator is fixed to the first fixing part and the second fixing part in the inside of the mold by being fixed to a predetermined position in the lower part of the lower plate of the mold and composed of a fixing plate horizontally formed in the lower part of the first fixing part To provide a method for manufacturing a camber prestressed concrete member.

Further, in the step (c), a movable fixing fixture fixing member, which is formed so as to connect the guide portion moving along the rail of the mold support and the upper portion of the guide portion in the width direction of the table, A fixed fixture is fixed to an upper portion of the fixing bar, and the protrusion is protruded upward through a lower plate at a predetermined position of a lower portion of a lower plate of the mold.

The method of manufacturing the non-cambered prestressed concrete member of the present invention can prevent the camber of the PSC member and thereby maintain the flatness of the member. Thus, the quality of the PSC member is excellent, Since the step between the members can be reduced, maintenance work can be eliminated and the workability can be improved. Also, since there is no step between the members due to the no camber member, it is easy to install the topping cone (concrete) It can be structurally safe, can prevent cracks due to excessive camber, and has a very useful effect that it is easy to store and store the member due to the no camber when the production member is stored in the factory.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
FIGS. 1 to 4 are views showing a method of manufacturing a non-camber prestressed concrete member according to the present invention in order.
5 is a perspective view illustrating an embodiment of a height adjuster of the present invention.
6 to 7 are views showing various embodiments of the fixture of the present invention.
8 is a view showing the structure mechanism of the non-camber prestressed concrete member of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

FIGS. 1 to 4 are views showing a method of manufacturing a non-camber prestressed concrete member according to the present invention in order.

First, as shown in FIG. 1, the mold support 20 is fixed to both ends of the table 10 in a longitudinal direction at an upper portion of the table 10 (a).

The mold support 20 is formed to have a predetermined size by mounting the mold 30 to be described later. The mold support 20 is fixed to the table 10 as shown in FIG.

The mold support 20 is designed so that the mold 30 is mounted on the table 10 in a raised shape as shown in Fig. 1B in order to manufacture the no camber prestressed concrete member in the shape of a convex upward protruding lower portion in the longitudinal center portion Is formed between the table (10) and the mold (30).

 The mold support 20 can be mounted on the table 10 in a variety of shapes that can be sandwiched between the lower surface of the mold 30 and the upper surface of the table 10, The mold support 20 may be spaced apart from the upper surface of the table 10 by a distance toward the longitudinal end of the mold 30 The height of the mold support 20 may be different depending on the position fixed to the upper portion of the table 10 because the center portion of the mold 10 is raised and the center portion of the longitudinal direction thereof is abutted against the upper surface of the table 10.

The height of the mold supporter 20 at the longitudinal end side of the mold 30 is high and the height of the mold supporter 20 is reduced even at the center portion so that the mold 30 can be mounted in a downwardly raised, do.

The mold support 20 can be moved in the longitudinal direction and adjusted in height according to the size and shape of the amount of the camber of the mold 30 mounted on the upper portion of the table 10, .

1, a pair of rails 21 are disposed in the longitudinal direction of the table 10 at a predetermined distance in the width direction, and the rails 21 To be moved along the axis.

A guide portion 221 formed to have a cross section corresponding to the rail 21 so that the lower portion is transported along the rail 21 and a height adjusting portion 222 formed to adjust the height on the guide portion 221, And a height adjusting device 22 including a fixing plate 223 formed on an upper portion of the height adjusting portion 222 is coupled to the rail 21 in a transportable manner.

The height adjuster 222 may be any of various known members such as a jack-up device for adjusting the height by turning the bolt as shown in the figure.

5 is a perspective view illustrating an embodiment of a height adjuster of the present invention.

5, the height adjusting portion 222 is formed in a v shape having a central portion joined by a hinge, and the upper arm 222a and the lower arm 222b, which are formed in a v shape, are symmetrically positioned with respect to each other And a spindle nut 222d is formed on one side of a connecting portion of the upper arm 222a and the lower arm 222b and the screw 222e is connected to the upper arm 222a and the lower arm 222b by a hinge member 222c, (222b) in the lateral direction so that one end thereof is screwed to the spindle nut (222d).

Although not shown, the other end of the screw 222e is threadedly engaged with the spindle nut 222d through the connecting portion of the upper arm 222a and the lower arm 222b of the adjacent height adjustment portion 222.

Therefore, when the screw 222e is rotated, the space between the spindle nuts 222d screwed to the screw 222e is narrowed or distanced, so that the distance between the center of the upper arm 222a and the center of the lower arm 222b becomes short .

The center of the upper arm 222a is coupled to the fixing plate 223 and the center of the lower arm 222b is coupled to the guide 221 to rotate the screw 222e, The height of the mold 30 fixed to the upper portion of the table 10 can be increased or decreased.

The fixing plate 223 provides a coupling surface for coupling the support plate 23, which will be described later.

The support plate 23 has a plate shape of a predetermined size as shown in the figure so that the lower surfaces of both ends thereof are coupled to the upper surface of the fixing plate 223 of the height adjusting device 22 adjacent to each other in the width direction, And a pair of height adjusting devices 22 which are movably fixed to the support plate 21 are connected in the width direction and the support plate 23 can support the lower surface of the mold 30 across the width direction .

Thereafter, the mold 30 is mounted on the upper portion of the table 10 (b).

1, the mold 20 includes a first side plate 32 and a first side plate 32, which are formed at both ends in the width direction of the lower plate 31 and the lower plate 31, And the second side plate 33 is fixed to the upper portion of the table 10 so that the lower portion of both sides in the longitudinal direction of the mold 30 is mounted on the upper portion of the mold supporting member 20. [

At this time, the first side plate 32 of the mold 20 is formed in a rectangular shape, and the lower plate 31 is formed flat without being convex downward, and is mounted on the upper portion of the mold support 20, The first side plate 32 of the mold 30 may be formed so as to be convex downward at the central portion thereof, and then the mold side plate 32 may be fixed to the mold 10 by means of bolts or the like. (20).

Since the distance of the mold support 20 from the upper surface of the table 10 is increased toward the longitudinal end of the mold 30 and the central portion in the longitudinal direction thereof is abutted against the upper surface of the table 10, In order to fix the mold 30 to the table 10 of the production line, a suitable distance is secured by using the mold support 20, and then fixed using bolts or other fixing means.

Thereafter, as shown in FIG. 2, a plurality of stranded wires 40 are arranged in the longitudinal direction inside the mold 30 (c).

The reinforcing stiffness of the member can be reduced and the size (height) of the member can be increased when the amount of camber is large, even though the stiffening line 40 in the mold 30 can be installed as a straight line, (30) can be arranged in the same shape as that of the mold (30).

In order to fix the stranded wire 40 to the mold 30 in such a manner that the stranded wire 40 rises upside down, various fixing jigs 50 such as an i-shaped bolt and a U-shaped bolt, .

6 to 7 are views showing various embodiments of the fixture of the present invention.

In particular, the fixing jig 50 may be configured as an upper mounting type for pressing and fixing the strand 40 at the upper portion of the mold 30. Such an upper mounting type fixing jig 50, as shown in FIG. 2, And a support bar 512 formed by a vertical lower portion of the fixing bar 511 and a supporting bar 512. The supporting bar 512 is formed in a ring shape The fixing bar 511 is formed so as to cross the width direction of the mold 30 and fixed to the mold 30 so that the stranded wire 40 is inserted into the fixing hook 513 So that the stranded wire 40 can be pressed to be laid in the shape of a raised upward.

The upper fixing fixture 50 is exposed to the upper portion of the fixing bar 511 at the time of pouring the concrete and cuts the fixing bar 511 after the concrete curing so as to fix the lower supporting bar 512 So that only the hook 513 is embedded in the concrete. Thus, the embedded fixture 50 is not only used to fix the position of the strand 40, but also as a shear connection material in combination with the shear reinforcement and topping concrete.

In addition, the fixing jig 50 may be formed in a shape of a saw-tooth as shown in FIG.

The fixing jig 50 has a vertical plate 521a formed vertically and having through holes 521b formed at regular intervals in the height direction and a horizontal plate 521b formed horizontally at the lower end of the vertical plate 521c and two or more spaced apart from each other by a predetermined distance and a fixing member 523 formed between the vertical plate 521a and the vertical plate 521a of the support member 521 6D, the strand 40 is disposed so as to pass through the lower portion of the roller 522 to reduce the friction between the strand 40 and the fixing jig 50 And the rotating roller 522 can be applied as rubber or wood having high elasticity in consideration of thermal conductivity and the like.

As shown in FIG. 6A, the fixing jig 50 may be formed such that two supporting members 521 are spaced apart from each other by a predetermined distance, and a rotating roller 522 is formed between the pair of supporting members 521 Three support members 521 may be spaced apart from each other by a predetermined distance as shown in FIG. 6B and a rotation roller 522 may be formed between the support member 521 and the support member 521, More support members 521 may be configured.

Further, the fixing jig 50 may be formed as an h-shape as shown in Fig. That is, as shown in FIG. 7A, a first fixing part 531, which is formed in a ring shape with an opening at the bottom, and a second fixing part 531, which is formed by forming a ring which is extended to the upper part of the first fixing part 531, The first fixing part 531 and the second fixing part 532 when the two strands 40 are inserted into the second fixing part 531 and the fixing part 532 horizontally formed in the lower part of the first fixing part 531, And may be fixed to the first fixing part 531 or the second fixing part 532 when the strand 40 is placed at the first step.

The fixing jig 50 and the h-shaped fixing jig 50 are fixed to the lower portion of the lower plate 31 of the mold 30 as shown in Figs. 6C and 7B. The bolts 51 are removed from the mold 30 in the step of removing the mold 30 and the bolts 51 are fixed to the lower part of the mold 30 at the upper part of the lower plate 31, So that the fixing jig 50 is embedded in the concrete so that the reinforcing bar 40 can be fixed so that the reinforcing bar 40 can be arranged in a raised shape after curing.

Particularly, the fixing jig 50 of the mold and h-type can be made to be able to be conveyed along the mold support 20 so as to be able to be installed at a correct position and to converge the position error. For this purpose, (21).

6d and 7c, the guide part 61 moving along the rail 21 of the mold support 20 and the upper part of the guide part 61 are formed so as to be connected to each other in the width direction of the table 10 The fixing jig 50 is fixed to the upper portion of the fixing bar 62 of the fixing jig fixing member 60 so that the fixing jig 50 is fixed to the fixing jig 50 can be moved along the rails 21 of the mold support 20.

The fixing jig 50 can not be fixed to the upper portion of the lower plate 31 at this time so that the fixing jig 50 passes through the lower plate 31 at a predetermined position below the lower plate 31 of the mold 30, A portion of the mold 30 protrudes to the upper portion of the lower plate 31 so that the strand 40 is fixed inside the mold 30. In the step of removing the mold 30 to be described later, The lower portion of the fixing jig 50 is cut into the concrete so as to fix the strand 40 so that the strand 40 can be arranged in a raised shape after curing.

3, concrete is placed in the mold 30, and finally, after the concrete curing, the table 10 and the mold 30 are removed as shown in FIG. 4 (e) A directionally bulging concrete member is manufactured and a no camber prestressed concrete member 2 made of a downwardly rising shape (deflecting member shape) by tensioning and fixing the strand 40 is formed in a form in which a camber is not generated Is completed.

8 is a view showing the structure mechanism of the non-camber prestressed concrete member of the present invention.

As shown in FIG. 8, when the concrete member is formed so as to protrude downward and the strand 40 is taut and fixed, the no-camber prestressed concrete member 2 can maintain smoothness.

The method of manufacturing a non-cambered prestressed concrete member of the present invention as described above can prevent the camber of the PSC member and thereby maintain the flatness of the member. Thus, the quality of the PSC member is excellent, Since the step between the members can be reduced during the installation of the members, it is possible to eliminate the maintenance work and improve the workability. Also, since there is no step between the members due to the no camber member, it is easy to install the topping cone Therefore, it is possible to prevent the cracks due to excessive camber, and it is very useful to easily store and store the members due to the no camber when the production member is stored in the factory.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: Table
20: Mold support
21: Rail
22:
23: Support plate
30: Mold
31:
32: first side plate
33: second side plate
40: Strand
50: Fixing jig
60: Fixing fixture fixing member
61: guide portion
62: Fixed bar
2: Non-camber prestressed concrete member

Claims (9)

(a) fixing a pair of mold supports 20 on top of a table 10 of a predetermined size so that two or more of them are symmetrical with respect to a longitudinal center portion of the table 10 at both ends in the longitudinal direction of the table 10, 20) is fixed in such a manner that the distance from the upper surface of the table (10) increases toward the longitudinal direction end and the longitudinal center portion abuts the upper surface of the table (10);
(b) a first side plate 32 formed upward at both end portions in the width direction of the bottom plate 31, and a second side plate 32 formed upward at both longitudinal ends of the bottom plate 31, The mold 30 is mounted on the upper portion of the mold supporting member 20 so that the lower portion of both sides in the longitudinal direction of the mold 30 is mounted on the upper portion of the mold supporting member 20, To the top of the back table (10);
(c) disposing a plurality of strands 40 in the mold 30 in the longitudinal direction;
(d) pouring concrete into the mold 30;
(e) after concrete curing, removing the table (10) and the mold (30) to produce a concrete member having a shape rising in a downward direction;
(f) tensioning and fixing the stranded wire (40) so that the concrete member in the shape of a downward risen rises upward so as to maintain the smoothness of the reinforced concrete member. The method according to claim 1,
In step (a)
The mold support 20 includes a pair of rails 21 spaced a predetermined distance in the width direction and arranged in the longitudinal direction on the upper portion of the table 10,
A guide portion 221 whose lower portion is fed along the rail 21,
A height adjusting part 222 formed to adjust the height of the guide part 221,
A plurality of height adjusting devices 22 including a fixing plate 223 formed on an upper portion of the height adjusting portion 222,
A support plate 23 coupled to the upper portion of the fixing plate 223 of the height adjusting device 22 to connect the height adjusting devices 22 adjacent in the width direction of the pair of rails 21 in the width direction of the table 10, Wherein the step of preparing the non-camber prestressed concrete member comprises the steps of: The method according to claim 1,
In step (a)
The height regulating portion 222 has an upper arm 222a having a v-shape, a central portion hingedly coupled to the fixing plate 223 and a central portion coupled to the fixing plate 223, and a hinge having a central portion hinged to a v- Both ends of the lower arm 222b are connected by a hinge member 222c,
A spindle nut 222d formed at one side of a connection portion of the upper arm 222a and the lower arm 222b and a spindle nut 222d having one end screwed to the spindle nut 222d and the upper arm 222a and the lower arm 222b in the horizontal direction And the other end is coupled with a screw 222e screwed to a spindle nut 222d formed on the other side of the connecting portion of the upper arm 222a and the lower arm 222b of the adjacent height adjustment portion 222 Wherein the method comprises the steps of: preparing a non-camber prestressed concrete member; The method according to claim 1,
In the step (b)
Wherein the mold (30) is formed such that the first side plate (32) is convex downward at a central portion thereof. The method according to claim 1,
In the step (c)
Wherein the strand (40) is roughened from the inside of the mold (10) by using a fixing jig (50). The method of claim 5,
In the step (c)
The fixing jig 50
A fixing bar 511 formed to intersect the width direction of the mold 30 and fixed to the mold 30 and a support bar 512 formed of a vertical lower portion of the fixing bar 511 and a supporting bar 512 And a fixed hook 513 formed on one side surface at a predetermined interval in the height direction,
And the stranded wire (40) is fitted and fixed to the fixed hook (513). The method of claim 5,
In the step (c)
The fixing jig (50)
And a horizontal plate 521c formed horizontally at a lower end of the vertical plate. The vertical plate 521c is spaced apart from the vertical plate 521a by a predetermined distance And a rotating roller 522 formed between the vertical plate 521a of the support member 521 and the vertical plate 521a and rotatably coupled by the fixing means 523 ,
And a stranded wire (40) is fixed to a lower portion of the rotating roller (522) in the mold (30) by being fixed at a predetermined position of the lower plate (31) of the mold (30) Lt; / RTI > The method of claim 5,
In the step (c)
The fixing jig (50)
A first fixing part 531 which is formed in a ring shape with its bottom opened and a second fixing part 532 which is formed by a ring formation which is extended to an upper part of the first fixing part 531 and opened at one side, And a fixing plate 532 horizontally formed at a lower portion of the upper portion 531,
And the strand 40 is fixed to the first fixing portion 531 and the second fixing portion 532 in the mold 30 by being fixed to a predetermined position of the lower plate 31 of the mold 30. [ A method for manufacturing a non - camber prestressed concrete member. The method according to claim 7 or 8,
In the step (c)
A guide portion 61 that moves along the rail 21 of the mold support 20,
The movable fixing fixture fixing member 60 is further comprised of a fixing bar 62 formed to connect the upper portion of the guide portion 61 in the width direction of the table 10,
A fixing jig 50 is fixed to an upper portion of a fixing bar 62 of the fixing jig fixing member 60 and is passed through the lower plate 31 at a predetermined position below the lower plate 31 of the mold 30, Wherein the first and second camber prestressed concrete members are formed to protrude.

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