KR20180023546A - Manufacturing Apparatus and Method for Pretension Concrete Beam - Google Patents

Abstract

The present invention relates to a manufacturing station to manufacture a pretension type prestressed concrete (PC) beam, applying only an vertical axial force without generating a rotary moment inducing buckling with respect to a vertical reaction plate when a tensioning member is tensioned to apply vertical prestress in a pretension type to manufacture a PC beam (pretension beam), thereby preventing the vertical reaction plate from being warped to enhance the reuse value of the vertical reaction plate, and preventing the scale of the vertical reaction plate from being excessively increased to enhance manufacturing economic efficiency of the pretension beam; and a pretension type PC beam manufacturing method using the same. According to the present invention, the manufacturing station comprises: a bottom part (7); the vertical reaction plate (6); first and second hinge connection members (1a, 1b) coupled to both ends of the vertical reaction plate (6), respectively, to be hinge-coupled to block transfer of the bending moment and transfer only the axial force to the vertical reaction plate (6); a settling side horizontal support (5); an extensible jack (3); and a tension side horizontal support (2) to tension the tensioning member (8) while being vertically moved. Accordingly, a reaction force generated in a process to tension the tensioning member (8) is applied to the vertical reaction plate (6) on an axis thereof as the axial force.

Description

Technical Field [0001] The present invention relates to a pre-tensioned prestressed concrete beam manufacturing apparatus and a prestressed prestressed concrete beam forming method using the prestressed pre-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production stand and a manufacturing method for manufacturing a prestressed concrete beam (hereinafter referred to as "pretension beam") by introducing longitudinal prestress in a pretension manner, When the tension member is tensioned in order to produce the tension beam, it is configured such that only the longitudinal axial force acts on the longitudinal reaction force band without generating a rotational moment that causes the female buckling, thereby preventing the vertical reaction force band from being bent A production stand for manufacturing a pre-tension beam capable of improving the recycling value of the longitudinal reaction force band and preventing an excessive increase in the size of the longitudinal reaction force band to improve the production economics of the pretension beam, To a method of manufacturing a pre-tension beam.

When preparing a pre-tension beam in which a tension force (prestress) is introduced by a pre-tensioning method, by pulling both ends of a tension member to fix the tension member, the concrete is cured by curing the concrete member in a desired member shape so that the tension member is embedded. The prestress is introduced into the concrete beam as the prestressing material shrinks by releasing the prestressing material by cutting or the like. In the present specification, the direction in which the tension members are disposed is referred to as "longitudinal direction ", and the direction perpendicular thereto is referred to as" lateral direction ".

In order to manufacture the pre-tension beam in this way, a production stand capable of pre-tensioning the tension material is used. In Korean Patent No. 10-1302719 and Korean Patent No. 10-1268002, Lt; / RTI > The workbench for pretensioning beams is provided with a reaction force band extending in the longitudinal direction, that is, a longitudinal reaction force band, in order to support a reaction force generated when the strain is pulled and tensed in advance. However, since the tensile material is arranged in parallel with the longitudinal reaction force band, the tensional force applied to the tensile material eventually acts in the longitudinal direction with the eccentric position with respect to the central axis of the longitudinal reaction force band. There arises a problem that bending moment is induced or buckling is induced in the longitudinal reaction force band. When such bending moment induction or buckling is induced, a bending deformation occurs in the longitudinal reaction force band, so that the linear bending moment can not be maintained, thereby making it difficult to recycle the longitudinal reaction force band.

In order to prevent such a problem, that is, to prevent bending moment induction or buckling induction on the longitudinal reaction force band, it is necessary to increase the rigidity of the longitudinal reaction force band or to increase the cross section, There arises a problem that the manufacturing cost of the beam is increased.

Korean Registered Patent No. 10-1302719 (Bulletin of Mar. 03, 2013). Korean Registered Patent No. 10-1268002 (Bulletin of Mar. 05, 2013)

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above problems, and it is an object of the present invention to provide a pretensioner beam, in which a tension member is disposed in parallel with a central axis of a longitudinal reaction force band, So that only the longitudinal axial force acts on the longitudinal reaction force bands, thereby preventing the occurrence of the bending deformation of the longitudinal reaction force bands and enabling the longitudinal reaction force bands to be recycled.

Further, the present invention effectively prevents the bending moment or buckling from being caused in the longitudinal reaction force bands even when the rigidity of the longitudinal reaction force bands is increased or the cross section is not increased, thereby preventing excessive increase in rigidity of the longitudinal reaction force bands or increase in cost And to provide a technique capable of improving the economical efficiency of production of a pre-tension beam.

In order to achieve the above object, according to the present invention, there is provided a production stand for manufacturing a pre-tension beam, comprising: a bottom portion having a flat upper surface and being placed on a ground surface; A longitudinal reaction force band extending in the longitudinal direction and having a plurality of transversely spaced apart and arranged parallel to each other; The first and second hinge connectors being coupled to both ends of the longitudinal reaction force band to block transmission of the bending moment and to make the axial force only transmitted to the longitudinal reaction force band; A fixing side transverse support fixed to the bottom portion and coupled to the first hinge connection member so that one end of the tension member passes through and is fixed; A telescopic jack disposed in close contact with the second hinge connector; And a tension side transverse support which is tightly installed with the stretching jack and fixed at the other end of the tension member by penetrating and the stretching jack is extended to tense the tension member while moving in the longitudinal direction, And the longitudinal reaction force band acts as an axial force on the central axis thereof.

According to another aspect of the present invention, there is provided a method of manufacturing a pretension beam, comprising the steps of providing a pre-tension beam production stand of the present invention, installing a mold, installing a mold on a floor, After both ends pass through the fixing side transverse support and the tension side transverse support respectively, both ends of the tension member are fixed to the outer fixing surfaces of the fixing side transverse support and the tension side transverse support respectively by fixing device, The tension force is applied to the longitudinal reaction force by acting as an axial force on the center axis of the longitudinal reaction force, and the concrete is placed so that the tension material is embedded. , When the concrete is cured, the both ends of the tension material are released from the fixed state, and the tension force previously introduced to the tension material is transmitted to the concrete portion And a pre-tension beam is produced so that a prestress is introduced into the concrete beam.

In the present invention, the first and second hinge connection members may include two bonding plates and an elastic material disposed therebetween, and the longitudinal reaction force unit may include a plurality of beam members connected in a longitudinal direction so as to be integrally connected It can have a segmented structure.

In the present invention, since the hinge structure is formed by the hinge joints at both ends of the longitudinal reaction force band, when a tensile force is introduced into the tensile material, a large bending moment generated in the first tension side transverse support arranged on the tension side is called a longitudinal reaction force So that only the axial force acts in the longitudinal direction along the central axis of the longitudinal reaction force band, thereby effectively preventing the longitudinal reaction force band from being bent or buckling induced. do.

Therefore, according to the present invention, it is possible to prevent the longitudinal reaction force band from being bent, thereby preventing the longitudinal reaction force bar from being damaged, and being easily recycled at other sites, .

Further, according to the present invention, it is possible to effectively prevent a bending moment or a buckling from being induced in the longitudinal reaction force band without increasing the rigidity of the longitudinal reaction force band or increasing the cross-section, so that the excessive increase in rigidity of the longitudinal reaction force band or the cost It is possible to improve the economical efficiency of the pre-tension beam.

1 is a schematic plan view of a pre-tension beam production stand according to the present invention.
2 is a schematic perspective view of the fusing side end indicated by circle A in Fig.
FIG. 3 is a schematic lateral side view of the fixing side end shown in FIG. 2. FIG.
Figure 4 is a schematic perspective view of the tension side end indicated by circle B in Figure 1;
5 is a schematic lateral side view of the tension side end shown in Fig.
Fig. 6 is a view showing a pair of longitudinal reaction force chains made of a single steel pipe.
FIG. 7 is a view showing a pair of longitudinal reaction force bars made of double steel pipes. FIG.
Fig. 8 is a view showing a pair of longitudinal reaction force groups made up of H beams having two webs. Fig.
Figure 9 is a schematic perspective view of the first and second hinge connectors.
FIG. 10 is a schematic plan view corresponding to FIG. 1 showing a state in which a tension is applied to a tension member by stretching operation of a stretch jack in the present invention. FIG.
11 is a schematic perspective view of the tension side end indicated by circle C in Fig.
12 is a schematic lateral side view of the tension side end shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

FIG. 1 is a schematic plan view of a pre-tension beam production stand 100 according to the present invention. FIG. 2 is a schematic perspective view of the circle A portion, that is, the fixing side end portion of FIG. 1, A schematic lateral side view of the fixing side end portion shown in Fig. 2 is shown. Fig. 4 shows a schematic perspective view of the circle B portion of Fig. 1, i.e., the tension side end to pull the tension, and Fig. 5 shows a schematic lateral side view of the tension side end shown in Fig. 4 . In describing the present invention for convenience, the direction in which the tension member extends, that is, the longitudinal direction of the pretension beam, is referred to as "longitudinal direction ", and the direction orthogonal to the longitudinal direction is referred to as" lateral direction ".

As shown in the figure, the pretensioning beam manufacturing stand 100 of the present invention is provided with a bottom 7, a longitudinal reaction force band 6, a fixing side lateral support 5, a stretching jack 3, A support base 2 and first and second hinge connectors 1a and 1b.

Specifically, the bottom part 7 is disposed on the ground so that a pre-tension beam can be formed on a flat surface, and can be made of a concrete slab having a flat upper surface and extending in the longitudinal direction.

The longitudinal reaction force band 6 is a member for supporting the reaction force generated in the process of tensing the tension member 8 and is provided on the bottom portion 7 by arranging a plurality of two or more members in parallel in the lateral direction. In the embodiment shown in the drawings, a pair of longitudinal reaction force bands 6 are provided, and in the lateral interval between the pair of longitudinal reaction force bands 6, a die for manufacturing the pretensioning beam is disposed . For the sake of convenience, the illustration of the formwork for the production of the pre-tension beam is omitted. The longitudinal reaction force band 6 may have a "segment structure" in which a plurality of short-length beam members in the longitudinal direction are successively connected to one another.

In the embodiment shown in Figs. 1 to 5, the longitudinal reaction force band 6 extending longitudinally in the longitudinal direction is composed of an H beam having upper and lower flanges and one web. The longitudinal reaction force band 6 However, the present invention is not limited thereto. Depending on the scale of the pre-tension beam to be manufactured, it may be made of a single steel pipe or a double steel pipe, and furthermore, it may be made of an H beam or a double H beam having two webs. 6 shows a pair of longitudinal reaction force pieces 6 made of a single steel pipe. In FIG. 6, (b) is a sectional view taken along the line K1-K1 in FIG. 6 Fig.

6, the longitudinal reaction force band 6 may be formed of a single steel pipe having a circular cross section, and an end plate 63 for finishing may be respectively provided at both longitudinal ends of the longitudinal reaction force band 6 have. When the end plate 63 is provided at both longitudinal ends of the longitudinal reaction force band 6, the first and second hinge connectors 1a and 1b The joining plate 10 of the first and second hinge connectors 1a and 1b is engaged with the end plate 63. [ In constructing the longitudinal reaction force generator 6 using a single steel pipe as described above, a filler such as mortar or concrete may be filled into a single steel pipe if necessary. The end plate 63 may be provided even when the longitudinal reaction force band 6 is made of a simple beam as shown in Fig.

7 shows an example in which the longitudinal reaction force piece 6 is formed of a double steel pipe in which an additional steel pipe is further disposed inside a steel pipe having a circular cross section. FIG. 7 (b) 7C is a cross-sectional view taken along the line JJ in FIG. 7A, that is, a cross-sectional view taken along the line KJ-K2, that is, a cross-sectional view taken along one line of the double- Fig. If the number of the tension members 8 for the pre-tension beam to be manufactured increases or the tension applied to the tension member 8 increases, the double steel tube may be connected to the longitudinal reaction force band 6 ). In the case of using the double steel tube as the longitudinal reaction force band 6 as described above, the rigidity in the longitudinal direction is further increased, and the weight is reduced rather than filling the inside of the single steel pipe shown in Fig. 6 with the filler, There are advantages. In the case of using the dual steel pipe as the longitudinal reaction force band 6 as described above, the gap material 62 may be provided between the two steel pipes constituting the double steel pipe such that eccentricity does not occur as shown in Fig. 7 (c) .

Fig. 8 shows a pair of longitudinal reaction force generators 6 having upper and lower flanges and consisting of a beam having a plurality of webs 63 between the upper and lower flanges. Fig. 8 (b) 8 is a longitudinal sectional view taken along line K3-K3 in Fig. 8 (a). Fig. As shown in Fig. 8, the longitudinal reaction force band 6 may be composed of a beam provided with a plurality of two or more webs 64 between the upper and lower flanges. Similarly to the case of FIG. 6, the longitudinal reaction force band 6 shown in FIGS. 7 and 8 may include an end plate 63 at both longitudinal ends of the longitudinal reaction force band 6, The end plate 63 is engaged with the joining plate 10 of the first and second hinge connectors 1a and 1b.

Furthermore, although not shown in the drawing, a bracing member may be provided at a lateral gap between the pair of longitudinal reaction force bands 6, and these bracing members may be provided in plural in the longitudinal direction . The bracing member functions to resist the imbalance force that can be transmitted from the tension member 8, in addition to the function of maintaining the lateral spacing between the pair of longitudinal reaction force bands 6.

The longitudinal reaction force band 6 is placed on the bottom portion 7 and coupled with the bottom portion 7. The reaction force band 6 is displaceable in the longitudinal direction, It is preferable that the longitudinal reaction force band 6 is coupled with the bottom portion 7 in such a manner as to allow the displacement in the longitudinal direction of the longitudinal reaction force band 6. [ When the longitudinal reaction force band 6 is composed of a beam having upper and lower flanges, a long hole 61 extending in the longitudinal direction is formed in the lower flange, and the anchor 60 penetrates the long hole, The longitudinal reaction force band 6 can be coupled to the bottom portion 7 in such a manner as to permit displacement in the longitudinal direction of the longitudinal reaction force band 6 as described above 4).

6 to 8, a separate plate member having the elongated hole 61 formed therein is integrally coupled to the longitudinal reaction force unit 6 so that the anchor 60 Can be penetrated.

In the present invention, the fixation side transverse support 5 is fixed to the bottom portion 7 at one longitudinal side of the bottom portion 7, that is, at the fixing side where one end of the tension member is fixed. 2 and 3, the fixing side transverse supporter 5 is a transversely extending member which is completely fixed to the bottom portion 7 so that the reaction force generated in the course of the tension of the tension member 8 is transmitted to the bottom portion 7 ). The fixing side end portion of the tension member 8 passes through the fixing side transverse supporter 5 and is fixed to the fixing side end portion of the tension member 8 passing through the fixing side transverse supporter 5, Bolts) are fixed and fixed to the outer side fixing surface of the fixing side transverse support 5.

The fixing side end of the longitudinal reaction force band (6) is engaged with the fixing side transverse support (5). In other words, all of the plurality of longitudinal reaction force units 6 are connected to the fixing side lateral supports 5 at their fixing side ends, respectively. As shown in FIGS. 2 and 3, in the present invention, A first hinge linking member (1a) is positioned between the fixing side end of the reaction force band (6) and the inner side engaging surface of the fixing side transverse supporter (5). In other words, a fixing side end portion of the longitudinal reaction force band 6 is coupled to one side of the first hinge connection member 1a, and an inner side coupling surface of the fixing side lateral support 5 is provided at the other side of the first hinge connection member 1a Lt; / RTI > The end plate 63 is engaged with one side of the first hinge linking member 1a when the end plate 63 is provided at the longitudinal end of each longitudinal reaction force unit 6 as mentioned above.

The first hinge connection member 1a is configured such that the fixing side end portion of the longitudinal reaction force band 6 and the inner side coupling face of the fixing side lateral support 5 are hinged to each other so that the longitudinal reaction force band 6, And is a member that transmits only the force in the longitudinal direction without transmitting the bending moment between the supports 5. The specific configuration of the first hinge connector 1a will be described later.

The second hinge connection member 1b is coupled to the tension side end of the longitudinal reaction force band 6 on the other longitudinal side of the bottom portion 7 on the tension side and subsequently the second hinge connection member 1b is provided with the extension jack 3 ). Specifically, the stretching jack 3 is provided on the tension side. In the present invention, the stretching jack 3 is not directly coupled to the tension side end of the direct longitudinal reaction force 6, And the second hinge connector 1b is positioned between the tension side end portion and the telescopic jack 3. [ Therefore, the tension side end portion of the longitudinal reaction force band 6 is coupled to one side of the second hinge connection member 1b, and one end of the expansion / contraction jack 3 is disposed to be in close contact with the other side of the second hinge connection member 1b. One end of the second hinge linking member 1b is engaged with the end plate 63 when the end plate 63 is provided at the longitudinal end of the longitudinal reaction force band 6 as described above.

The second hinge connection member 1b also allows the tension side end of the longitudinal reaction force band 6 and the telescoping jack 3 to be hinged to each other similarly to the first hinge connecting member 1a described above, The bending moment is not transmitted between the longitudinal reaction force band 6 and the stretch tension side lateral support 2 but only the longitudinal force is transmitted. Fig. 9 shows a schematic perspective view of the first and second hinge connectors 1a and 1b. As illustrated in the figure, the first and second hinge connectors 1a and 1b are configured to include two joint plates 10 and an elastic member 11 interposed therebetween. The two joining plates 10 of the first hinge connection member 1a are integrally joined to the fixing side end of the longitudinal reaction force band 6 and the inner joining face of the fixing side lateral support 5, The two joining plates 10 are joined to the tension side end of the longitudinal reaction force band 6 and the stretching jack 3, respectively. The elastic material 11 is an elastic material such as rubber or synthetic resin, and can be stretched or shrunk in the longitudinal direction and sheared in the transverse direction.

Thus, the first and second hinge connectors 1a and 1b have the sandwich configuration in which the elastic members 11 are sandwiched between the two joining plates 10, respectively. Therefore, the first and second hinge connectors 1a and 1b, 1b connect the members on both sides in the longitudinal direction, the bending moment is not transmitted but the hinge connection is made so that only the force in the longitudinal direction is transmitted. That is, the bending moment is not transmitted between the longitudinally opposite side members continuing to each other with the first and second hinge connectors 1a and 1b interposed therebetween, and only the force in the longitudinal direction is transmitted.

A second hinge linking member 1b is integrally coupled to an end of the longitudinal reaction force band 6 and is integrally coupled to the second hinge linking member 1b, The hinge connector 1b is provided with a telescopic jack 3 (see Fig. 4). At this time, the telescopic jack 3 is arranged at a position where it is aligned with the longitudinal reaction force band 6 in the longitudinal direction. The other side of the telescopic jack (3) is in close contact with the inner engaging surface of the tension side transverse support (2).

The tension side transverse support 2 is a transversely extending member which, like the fixing side transverse supporter 5, allows the tension side end of the tension member 8 to pass through the tension side transverse support 2, A fixing device 88 (for example, an engagement bolt) is fixedly fixed to an outer fixing surface of the tension side transverse support 2 at a tension side end portion of the tension member 8 passing through the transverse supporter 2. On the other hand, the fixing side transverse supporter 5 is fixed to the bottom portion 7 and does not move, while the tension side transverse supporter 2 is moved in the longitudinal direction according to the expansion and contraction of the expansion jack 3. In order to allow the tension side transverse support 2 to move smoothly in the longitudinal direction, a moving rail 70 may be provided in the bottom 7 in the longitudinal direction if necessary and the tension side transverse support 2 may be moved It is preferable to arrange it so that it is placed on the rail 70 and moved in the longitudinal direction along the movable rail 70 (refer to Fig. 5).

Fig. 10 is a schematic plan view corresponding to Fig. 1 showing a state in which a tension force is introduced into the tension member 8 by the extension operation of the telescopic jack 3, and Fig. 11 shows a circle C portion of Fig. 10, A schematic transverse perspective view of the side end is shown, and Fig. 12 shows a schematic lateral side view of the tension side end shown in Fig. 11 and 12, the dotted line indicates the state before the stretching force is introduced to the tension member 8, that is, the state before the stretching jack 3 is stretched.

10 to 12, a detailed description of a process of introducing a tension force into the tension member 3 will be described in detail. The longitudinal force unit 6, the fixing side transverse supporter 5, the expansion jack 3, the tension side transverse supporter 2 and the first and second hinge connectors 1a and 1b are respectively provided on the bottom 7 in the manner described above and both ends of the tension member 8 are fixed to the fixing side transverse support 5 and the tension side transverse support 4 so that the fixing device is fixed to both ends of the tension member 8 and is fixed and fixed to the outer fixing surfaces of the fixing side transverse support 5 and the tension side transverse support 4 respectively.

When the stretch jack 3 is stretched in this state, the tension side transverse supporter 2 is moved in the longitudinal direction so that the tension member 8 is tensed and a tensile force is introduced into the tension member 8, Is applied to the longitudinal reaction force band (6) in the form of axial force via the connecting member (1b). The axial force applied to the longitudinal reaction force band 6 in this way is transmitted from the fusing side end portion to the fixing side transverse support 5 via the first hinge connection member 1a and is ultimately transmitted to the bottom portion 7. [

In the present invention, first and second hinge connectors 1a and 1b are provided at both ends of the longitudinal reaction force band 6, respectively, in such a manner that a tensile force is introduced into the tensile member 8 and a reaction force is transmitted to the longitudinal reaction force band 6. [ 1b are combined to form a hinge connection, only the axial force acts in the longitudinal direction along the central axis of the longitudinal reaction force band 6, and the vertical reaction force band 6 can be deformed or buckled The bending moment is not transmitted to the longitudinal reaction force band 6, and the generation of the secondary stress is suppressed. That is, in the present invention, the tension members 8 are arranged side by side with respect to the central axis of the longitudinal reaction force band 6, so that the reaction force generated by the introduction of the tension force of the tension member 8, The bending moment is not transmitted to the longitudinal reaction force band 6 by the first and second hinge connection members 1a and 1b and only the longitudinal axial force is transmitted to the longitudinal reaction force band 6, It is possible to effectively prevent the bending moment or the buckling from being induced in the longitudinal reaction force band 6. [

Therefore, according to the present invention, it is possible to prevent the longitudinal reaction force band 6 from being warped, thereby preventing the longitudinal reaction force band 6 from being damaged and being easily recycled in other fields , Which makes it possible to greatly improve the economical efficiency of construction.

Further, according to the present invention, it is possible to effectively prevent the bending moment or the buckling from being caused in the longitudinal reaction force band 6 without increasing the rigidity of the longitudinal reaction force band 6 or increasing the cross section, It is possible to prevent an excessive increase in rigidity or an increase in cost due to an increase in cross section, thereby improving the manufacturing economics of the pretension beam.

After the tension force is introduced into the tensile member 8 through the above process, a mold is provided on the bottom portion 7 at a distance between the longitudinal reaction force pieces 6 in the same manner as in the prior art so that the tensile member 8 is buried After the concrete is poured, when the concrete is cured, the both ends of the tension member 8 are released from the fixed state so that the torsion force previously introduced to the tension member 8 is transmitted to the concrete portion so that the prestress is introduced into the concrete beam.

1a: first hinge connector
1b: second hinge connector
2: second tension side transverse support
3: Extension Jack
5: Fixing side transverse support
6: longitudinal reaction force band
7:
8: Tension material

Claims (7)

As a stand for producing pre-tension beams
A bottom portion 7 having a flat upper surface and being placed on the ground and placed in a mold;
A longitudinal reaction force band (6) extending in the longitudinal direction and having a plurality of transversely spaced apart and arranged parallel to the bottom (7);
The first and second hinge connectors 1a and 1b are coupled to both ends of the longitudinal reaction force band 6 so as to be hinged so that only the axial force is transmitted to the longitudinal reaction force band 6 while blocking transmission of the bending moment. ;
A fixing side transverse support 5 coupled to the first hinge connection member 1a and fixed to the bottom portion 7 and having one end of the tension member 8 penetrated and fixed;
A telescopic jack 3 disposed in close contact with the second hinge connector 1b;
And the other end of the tension member 8 is fixedly inserted into the tension jacket 3. The tension jacket 3 is tensioned when the stretch jack 3 is extended, 2)
Wherein the reaction force generated in the course of straining the tensile material (8) acts on the longitudinal reaction force band (6) as an axial force on the central axis thereof.
The method according to claim 1,
Wherein the first and second hinge connectors (1a, 1b) include two bonding plates (10) and an elastic material (11) located therebetween.
3. The method according to claim 1 or 2,
Wherein the longitudinal reaction force band (6) has a segment structure in which a plurality of beam members are continuously connected in a longitudinal direction.
3. The method according to claim 1 or 2,
The longitudinal reaction force band (6) is made of a single steel pipe having a circular cross section.
3. The method according to claim 1 or 2,
The longitudinal reaction force band (6) is made of a double steel pipe in which an additional steel pipe is further disposed inside a steel pipe having a circular cross section.
3. The method according to claim 1 or 2,
The longitudinal reaction force band (6) is composed of a beam having upper and lower flanges, and a plurality of webs (64) provided between the upper and lower flanges.
A method of fabricating a pretension beam,
A bottom portion 7 having a flat upper surface is provided on the ground;
A longitudinal reaction force band (6) extending in the longitudinal direction and having a plurality of transversely spaced apart and arranged parallel to each other, and a transverse reaction force band (6) coupled to both ends of the longitudinal reaction force band The first and second hinge connectors 1a and 1b are hinge-connected to be transmitted to the longitudinal reaction force bands 6. The first and second hinge connectors 1a and 1b are coupled to the first hinge connector 1a and fixed to the bottom portion 7, 8 and a fixing jig 3 which is in close contact with the second hinge connection member 1b and which is in tight contact with the stretching jack 3 and which is provided with a tension member 8 And a tension side transverse support (2) for tensioning the tension member (8) while being moved in the longitudinal direction when the stretching jack (3) is stretched. The pretensioner beam manufacturing stand (100) (7);
A mold is provided on the bottom part 7 and the tension member 8 is passed through both the fixing side transverse support 5 and the tension side transverse support 2 respectively and then the fixing device is engaged, ) To the outer fixing surfaces of the fixing side transverse support (5) and the tension side transverse support (2), respectively;
The tension jacket 3 is stretched to move the tension side transverse supporter 2 in the longitudinal direction to tense the tension member 8. The reaction force generated in the process of tensioning the tension member 8 is transmitted to the longitudinal reaction force band 6 Acting as an axial force on its central axis;
When concrete is cured after the concrete is poured so that the prestressing material 8 is buried, the both ends of the prestressing material 8 are released from the fixed state so that the prestressing force introduced into the prestressing material 8 is transferred to the concrete portion, Wherein the pre-tension beam is produced in such a manner that the pre-tension beam is formed.

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