KR101569879B1 - Rahmem structure using prestressed steel beam and the construction method therefor - Google Patents

Abstract

The present invention relates to a raymen structure made by using a prestressed steel beam which has both end portions of a prestressed steel beam fixedly installed in both shift portions, and integrally casting a right-angled portion of concrete and a bottom-plate concrete to construct a raymen structure, The ramen structure is made up of a steel beam with a compression prestress P1 introduced into the lower portion of the neutral shaft by the lower tension member, an upper tension member mounted on the upper portion of the neutral shaft (upper flange), and an end vertical fixing member A prestressed steel beam including a mid-section steel beam including an end-section steel beam and a mid-section steel beam connected between the end-section steel beams; And both alternating portions in which the prestressed steel beam is strong.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rheme structure using a prestressed steel beam,

The present invention relates to a rheme structure manufactured using a prestressed steel beam and a construction method thereof. More specifically, a raymen structure made by using a prestressed steel beam that fixes both end portions of a prestressed steel beam to both shift portions, and integrally casts a right-angled portion of the concrete and a bottom-plate concrete, It is about.

In the past, a raymen structure was installed as a reinforced concrete. However, due to the characteristics of concrete, it was limited to installation of a raymen structure having a certain span or less. Also, it was necessary to install a ramshafting form at the time of installation, There has been a problem in that it can not be used.

In addition, a synthetic ramen structure (using a steel composite beam such as a PF beam) has been developed. However, since the construction of the upper slab formwork and the part of the building is limited, Has remained.

In addition, since the width of the lower casing concrete installed on the lower flange of the steel is 2 to 5 times larger than the width of the upper flange of the steel, a certain range of the lower casing concrete installed around the steel during the introduction of the pre- In the case where only the prestress is introduced and the outer side of the bridge is introduced with inhomogeneous compressive force such as no or little prestress is introduced, the compressive force is applied in the lower casing concrete by the repeated action of the load acting on the bridge, There is a problem that the life of the bridge is reduced due to the occurrence of cracks in the unused portion of the bridge.

In this case, a steel composite rheme structure in which prestressing is introduced by prestraining and a tension material is also introduced. Referring to FIG. 1,

A horizontal steel member 11 and a vertical steel member 12 connected at right angles to the lower ends of both side ends of the horizontal steel member and a hook member 13 connecting the horizontal steel member 11 and the vertical steel member 12, Shaped rafter frame 10,

A steel wire 25 is installed on the horizontal steel member 11 using a fixing bracket and a downward flexural load P is applied to the upper portion of the horizontal steel member 11 of the manufactured rafter steel member 10,

The lower casing concrete 16 installed by placing the concrete over a part of the lower flange of the horizontal steel material 11 in a state where the load P is applied to the horizontal steel material 11,

The load P is removed from the lower casing concrete 16 to allow the prestress to be introduced into the lower casing concrete,

There is introduced a steel composite laminated structure composed of a horizontal steel material in which a tensile force is introduced into the steel wire 25 to further introduce a prestress into the lower casing concrete 16. [

In this study, steel framed ra- mement structures are designed to allow the framing load (P) to be applied to the rafter frame (10) and the tensional force to be applied to the lower casing concrete (25, (10) The manufacturing cost is high and the work type is complicated in applying the positive reflection load (P), which is disadvantageous in that it is uneconomical.

Therefore, in order to effectively cancel the bending moments acting on the steel beam and the bending moments acting on the steel beam, the present invention provides a tension member only at both ends of the steel beam located at the right corner, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a rasten structure using a prestressed steel beam which can minimize the amount of steel for the steel beam production by introducing a prestress,

In order to achieve the above technical object

First, a prestressed steel beam is produced by connecting a center steel beam between pre-introduced end-end steel beams, and the pre-stressed steel beam is fixedly installed (rigidly) on the upper surface of both shifts by using an end vertical stand.

In other words, a prestressed steel beam is produced by connecting the both end steel beam and the center steel beam to each other. The both end steel beams are manufactured so that the compressive prestress P1 is introduced in advance around the lower flange by using the lower prestress,

A center steel beam not subjected to compression prestress P1 and both end steel beams previously introduced with compression prestress P1 are connected to each other with a damper plate and a connecting bolt to produce a prestressed steel beam, And the end portion is vertically tilted on the upper surface of the alternating portion by using an end vertical fixing member formed of a pair of steel members.

Secondly, when the prestressed steel beams are fixedly installed (tightened) on the upper surface of both alternating portions by using the vertical vertical fixing table provided on the bottom of the both end steel beams, a bending moment M1 is generated in the center steel beam by its own weight . In addition, the bending moments (M2) are generated in both end portions of the prestressed steel beam in the ramen structure due to the above-mentioned stiffness. In order to cancel the bending moment M1 and the bending moment M2, the compression prestress P1 introduced into the both end steel beams is released (separated by separating the lower tension members) The upward force (V1, a force that causes the central portion of the steel beam to curve upward) to cancel the moment M1 and the bending moment M2 generated in the right corner is generated.

Thirdly, the upper prestressing material is further tensioned at both ends of the prestressing steel beam to fix the prestressing material after the tension, thereby further canceling the rightward flexing moment (M2) by the compressive prestressing (P2) And the upward momentum V2 is generated in the moment M3.

At this time, the upper tension member can be installed using the lower tension member disassembled in the process of releasing the compression prestress introduced into the both end steel beams.

Fourth, the end-portion steel beams having the compression prestress introduced in advance can separately form the end portion synthetic concrete around the lower flange so that the introduction efficiency of the compression prestress (P2) by the lower tension member can be increased.

That is, the compressive prestress P1 is formed by integrating the end concrete into the both end steel beams introduced in advance, and connecting the end concrete to the center steel beam. This makes it possible to manufacture a more cost-effective prestressed steel beam since the compression prestress P1 plays a role of reducing the amount of steel in the manufacture of both end steel beams introduced in advance.

As a result, the present invention is characterized in that a prestressed steel beam is installed between the alternate portions of the rheme structure, and the bending moments generated at the center portion of the prestressed steel beam and the bending moments generated at both ends of the prestressed steel beam, The present invention provides a rheme structure using a prestressed steel beam and a construction method thereof, which can be manufactured by forming a prestressed steel beam with a more economical cross-section by controlling the prestressed prestresses (P1, P2)

The present invention is based on the premise that in a ramen structure using a prestressed steel beam, a prestressed steel beam is fixed to both alternating portions and a bending moment in the central portion of the steel beam is generated by a compressive prestress (P1) The force is canceled by the upward force (the force which causes the central portion of the steel beam to curve upward) through the release,

It also controls the bending moments occurring at both ends of the prestressed steel beams which are tightened on both alternating sections through the upper tension material installed on both ends of the prestressed steel beams, and also causes upward force on the steel composite beam.

That is, the amount of introduction of the compressive prestresses (P1, P2) and the upward forces (V1, V2) in advance is calculated from the prestressed steel beams constituting the rumen structure (A), the bending moment generated by the self weight and the working load of the slab and the right- The present invention enables the construction of a raymen structure using a prestressed steel beam having a more economical and effective cross section.

As a result, the prestressed steel beam used in the present invention minimizes the bending moments and the bending moments of the right angles, thereby minimizing the amount of steel required for manufacturing the prestressed steel beams.

In addition, since the upper tension member, the fixing operation, and the prestress release operation by the lower tension member are performed at both ends, the two shift portions can be utilized as a work space, thereby ensuring sufficient workability and economical efficiency.

Further, after the lower tensile material is disassembled, it can be used as an upper tensile material, thereby making it possible to provide a more economical and efficient rheme structure and a construction method thereof.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a construction cross-sectional view of a conventional raymen structure using a steel composite beam,
FIGS. 2A, 2B, 2C, 2D and 2E are a perspective view and a perspective view, respectively, of a composite composite beam according to the present invention,
3 is a functional diagram of a rheme structure using a steel composite beam of the present invention,
FIGS. 4A, 4B, 4C and 4D are flowcharts of the rheme structure using the steel composite beam according to the present invention and a construction method thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[The prestressed steel beam 100 of the present invention]

FIGS. 2a, 2b, 2c, 2d and 2e are perspective and exploded perspective views, respectively, of a raymen structure provided with a prestressed steel composite beam 100 of the present invention.

2A, the prestressed steel beam 100 includes a lower tension member 113 installed on the lower flange using an end vertical stiffener and an intermediate vertical stiffener, and an upper tension member 117 installed on the upper flange using an upper fixing unit End steel beam 110 and a mid-section steel beam 120 which are connected to both sides of the center steel beam 120. The end-

Specifically,

First, the end-portion steel beam 110

The steel beam 111, the end portion synthetic concrete 112, the lower tension member 113, the end portion vertical stiffener 114, the intermediate vertical stiffener 115, the end vertical fixing portion 116, the upper tension member 117, (118).

As shown in Figs. 2B and 2C, the steel beam 111 is an I-shaped steel beam including an upper flange, an abdomen and a lower flange. The steel beam is spaced apart from the end vertical stiffener 114, the end vertical stiffener 114, It can be seen that a plurality of vertical stiffeners 115 are formed on both sides of the abdomen between the upper and lower flanges.

At this time, the end portion synthetic concrete 112 may not be formed in the steel beam as shown in FIG. 2B, and the end synthetic concrete 112 may be formed as shown in FIGS. 2c and 2d.

2C and 2D, the concrete is formed around the lower flange of the steel beam 111. However, it is possible to manufacture the concrete by using a separate form, but the two ends of the steel beam 111 So as to ensure workability by placing and curing concrete on the upper surface of the lower flange between an end vertical stiffener 114 in the form of a vertical plate and an intermediate vertical stiffener 115 formed nearest to the central portion of the steel beam .

Since the end synthetic concrete 112 is formed only on both end steel beams 110, the compression prestress P1 introduced into the end synthetic concrete 112 can be released without significantly increasing the weight of the prestressed steel beam 100 And serves to offset the flexural moment of the prestressed steel beam 100.

The compression prestress P1 is introduced by using the lower tension member 113. When the end synthetic concrete 112 is not formed, the lower tension member 113 which is a PC steel bar is inserted into the end vertical reinforcing member 114, (Fusing plate, fixing wedge, etc.) provided on the outer surface of the end vertical stiffener 114 and the outermost intermediate vertical stiffener 115 through both ends of the intermediate vertical stiffener 115 so as to be tensioned and fixed .

When the end synthetic concrete 112 is formed, the sheath is previously embedded in the longitudinal synthetic concrete 112 so that the lower tension member 113, which is a PC steel bar, is inserted between the end synthetic concrete 112 and the end vertical stiffener 114, So that both ends are passed through the vertical stiffeners 115 and tensioned and fixed by a fixing device (fixing plate, fixing wedge, etc.) provided on the outer surface of the end vertical stiffener 114 and the outermost intermediate vertical stiffener 115 .

As shown in FIG. 2A, the end synthetic concrete 112 is formed to extend from the end surface of the end steel beam 110 only by a predetermined length (L1, between the end vertical stiffener 114 and the outermost intermediate vertical stiffener 115) So that the extended portion L2 where the end portion synthetic concrete is not formed is connected to the center steel beam 120. [

In addition, the cross-sectional height of the end portion synthetic concrete 112 may be determined so as to be positioned below the neutral axis of the prestressed steel beam 100, and the lateral width may be determined according to the width of the lower flange transverse direction of the steel beam 111.

As shown in FIGS. 2B and 2C, the end vertical fixing rods 116 are formed to extend downward at the bottom of the end portions of the both end steel beams 110 to form a pair of end vertical fixing rods 116 spaced apart from each other, ), Self-support of the right corner, reinforcement of the right corner, and inner support lighting by the bending moment.

It is noted that the inner end vertical fixing table 116a formed on the end surface of each steel beam 111 and the outer end vertical fixing table 116b spaced apart from the inner end vertical fixing table 116a are spaced apart from the central portion of the end synthetic concrete 112 .

The inner end vertical fixing table 116a and the outer end vertical fixing table 116b may be made of H-shaped steel members, and H-shaped steel members having the same cross-section and height may be used.

As shown in FIG. 2A, the end beam 110 is formed such that the steel beam 111 formed on the bottom surface of the end vertical fixture 116 is inserted into the lower portion of the prestressed steel beam neutral axis by the lower tension member 113 So that it is integrally connected to the center steel beam 120 so as to have the entire extension length L1 + L2.

The upper fixing devices 118 are spaced from each other in the longitudinal direction so that the upper tension member 117 having a predetermined length can be fixed after the tension is applied to the upper flange of each steel beam 111,

The flexural moment of the prestressed steel beam 100 and the flexural moment of the right angle of the ramen structure are controlled by the compression prestress P2 introduced by the upper tension member 117 such as a PC steel bar.

At this time, it can be seen that the extension length L4 of the upper tension member 117 is formed to be smaller than the extension length L1 + L2 of the steel beam 111, and is formed to be larger than the extension length of the lower tension member 113 .

The center steel beam 120 is then fabricated separately and connected between the end steel beams 110 to complete the prestressed steel beam 100 of the present invention.

The center steel beam 120 may be connected to the end surface of the steel beam 111 where the lower tension member 113 is not formed by using the damper plate 121 and the connecting bolt 122 and a nut.

Accordingly, it is preferable that the center steel beams 120 and the both end steel beams 110 are formed to have the same cross section to facilitate connection. However, the width of the end steel beams 110 is larger than that of the center steel beams It does not exclude that they are connected to each other in the form of a cross section.

2A, the total extension length (L = 2 * (L1 + L2) + L3) of the prestressed steel beam 100 is secured by the extension length L3 of the center steel beam 120, Is determined corresponding to the span of the structure (A).

[Raman structure (A) produced by using the prestressed steel beam 100 of the present invention]

Figure 3 illustrates the operation of the rheme structure (A) using the prestressed steel beam 100 of the present invention.

The prestressed steel beam 100 is connected to both ends of the steel beam 110 and the center steel beam 120 and the ends of the steel beam 110 are compressed by the lower prestressing material 113 And the upper surface of the upper tension member 117 is in a state of being simply mounted (tensioned and not fixed).

Thus, the prestressed steel beam 100 is first fixedly installed on the upper surface of the alternating portion 200 by using the end vertical fixing member 116.

The prestressed steel beam 100 fixed to the alternating portion 200 generates a bending moment M1 in the center steel beam 120 due to its own weight and in order to offset the bending moment M1, The pre-tensioned fixation of the lower tension member 113 is released to release the introduced compression prestress P1.

That is, since the prestressed steel beam 100 is supported by the alternate portion 200 through the release of the compressive prestress P1, the upward movement of the prestressed steel beam 100 in the form of a reaction force V1) is generated and the bending moment generated in the center steel beam 120 is canceled.

When the prestressed steel beam 100 is fixed to the upper surface of the alternating unit 200 by means of the end vertical fixing member 116, the bending moment M2 is generated in the right corner of the prestressed steel beam 100 do.

Thus, the compressive prestress P1 by the lower tension member can be released to cancel the right leg bending moment M2.

Further, according to the present invention, the upper prestressing member 117 located above the neutral axis of the prestressed steel beam 100 is fixed to the upper fixing unit 118 after being tensed, and the generated prestressing force P2 generated by the compression prestressing unit (V2) which also cancel out the bending moment acting on the prestressed steel beam.

Accordingly, the upward force V1 generated by the release of the compressive prestress P1 by the lower tension member 113 of the prestressed steel beam 100 and the upward prestressing force caused by the lower tension member disassembly are transmitted to the upper tension member 117, It is possible to optimize the cross-section of the prestressed steel beam by introducing the compression prestress (P2) by introducing the compression prestress (P2) and the additional upward force (V2) and to control the bending moment generated in the right- It can be seen that

3 shows a case where the end synthetic concrete 112 is formed, but the same is true of the case where the end synthetic concrete 112 is not formed.

[Method of constructing the raymen structure (A) using the prestressed steel beam 100 of the present invention]

4A to 4D are flowcharts of a method of constructing a rheme structure (A) using the prestressed steel beam 100 of the present invention.

First, the prestressed steel beam 100 as shown in FIG. 4A is manufactured first.

The prestressed steel beam 100 is connected to both ends of the steel beam 110 and the center steel beam 120 such that the compressive prestress P1 is introduced by the lower prestressing material 113, And the upper tension member 117 is simply installed on the upper surface. Of course, it is also possible to form both end steel beams with the end synthetic concrete 112 formed on the upper surface of the lower flange.

Further, the end vertical fixing rods 116 are installed in pairs by the outer end vertical fixing rods 116a and the inner end vertical fixing rods 116b spaced from each other, so that the prestressed steel beams 100 are separated from the upper surface of both shift portions by the weight of the steel beams It is possible to effectively prevent the pull-out by the pull-

It is advantageous to install the prestressed steel beam 100 by itself, thereby preventing conduction during construction,

Since the inner end vertical fixing table 116b forms an inner supporting point in the prestressed steel beam 100 with respect to the outer end vertical fixing table 116a, the inner end vertical fixing table 116b can effectively resist the bending moment caused by the weight of the steel beam,

It is possible to reinforce the right corner portion of the ramen structure by installing the pair of end vertical fixing rods 116. [

Although FIG. 4A shows the case where the end portion synthetic concrete 112 is not formed, it is also possible to use the end portion synthetic concrete 112.

Next, as shown in FIG. 4B, the prestressed steel beam 100 is placed on the upper surface of the alternating portion 200 by using an anchor bolt or the like on the top surface of the two alternating portions, 200) (fixed fastening by anchor bolt and nut, etc.).

The bending moment M1 due to its own weight and the bending moment M2 at the right corner are generated in the center steel beam 120 of the prestressed steel beam 100. [

As shown in FIG. 4C, the compression prestress P1 introduced to the lower portion of the neutral axis of the prestressed steel beam 100 is released to cancel the bending moment M1 and the bending moment M2. This is a simple operation of disassembling and separating the lower tensile member 113.

Further, by using the separated lower tension member 113 or by further fixing the upper tension member 117 on the upper surface of the both end steel beams 110 of the prestressed steel beam 100 after the tension, the amount of the prestressed steel beam 100 It can be seen that the right angle bending moment M2 generated at the end portion and the upper portion of the shift portion is substantially canceled and an additional upward force V2 is generated at the center portion of the prestressed steel beam 100. [

Next, as shown in FIG. 4D, the bottom plate concrete and the right corner concrete are simultaneously placed at the upper portion of the alternating portion 200 and the upper portion of the prestressed steel beam 100 to complete the final razor structure A.

2a and 2d, the bending moments of the prestressed steel beam 100 and the bending moments of the right angles generated by a load action such as a vehicle passing may be determined by the compressive prestresses P1 and P2 due to the lower tension members and the upper tension members, And the upward force (V1, V2).

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Prestressed steel beam
110: Both ends steel beam
111: Steel beam
112: end synthetic concrete
113: Lower tension member
114: end vertical stiffener
115: Medium vertical stiffener
116: end vertical stand
117: Upper tension member
118: Top fixing device
120: central steel beam
121: Overhang plate
122: Connection Bolt
200:

Claims (10)

The compression prestress P1 is introduced into the lower portion of the neutral shaft in advance by the lower tension member 113. The upper tension member 117 is mounted on the upper portion of the neutral shaft and the end vertical fixing member 116, A prestressed steel beam 100 comprising a steel beam beam 110 comprising a steel beam 111 formed by a steel beam 111 and a central steel beam beam 120 connected between the steel beams 110; And
And two alternating portions (200) where the prestressed steel beam (100) is strong,
The bending moment M1 and the prestressed steel beam 100 due to the weight of the prestressed steel beam 100 are generated by using the upward force V1 generated by releasing the compression prestress P1 by the lower tension member 113, And the upper tensile member 117 is fixed to the prestressed steel beam 100 after tension so that an additional upward force V2 is generated in the prestressed steel beam 100 A ramen structure fabricated using a prestressed steel beam to further offset the flexural moment (M1) and the flexural moment (M2). The method according to claim 1,
The end vertical fixing member 116
An inner end vertical fixing table 116a formed on the lower end surface of the steel beam 111 and an outer end vertical fixing table 116b spaced apart from the longitudinal direction of the inner end vertical fixing table 116a and spaced apart from the central portion of the end synthetic concrete 112 So that the inner end vertical fixing table 116a and the outer end vertical fixing table 116b are fixedly mounted on the upper surfaces of the two alternating portions so that the prestressed steel beam is stronger on the upper surfaces of the two alternating portions. Made ramen structure. The method according to claim 1,
The steel beam 111 is an I-shaped steel beam including an upper flange, an abdomen, and a lower flange. The intermediate vertical stiffener 115 is spaced apart from the end vertical stiffener 114, The lower flange being formed on both sides of the abdomen,
The compression prestress P1 is formed such that the lower tension member 113 penetrates the end vertical stiffener 114 and the intermediate vertical stiffener 115 so that both ends of the end vertical stiffener 114 and the outermost intermediate vertical stiffener 115 A raymen structure constructed using a prestressed steel beam that is tensioned and fused to the fusing device (fusing plate, fusing wedge, etc.) installed on the side. The method according to claim 1,
The steel beam 111 is an I-shaped steel beam including an upper flange, an abdomen, and a lower flange. The intermediate vertical stiffener 115 is spaced apart from the end vertical stiffener 114, The lower flange being formed on both sides of the abdomen,
An end synthetic concrete 112 is further extended in the longitudinal direction on the upper surface of the lower flange between the end vertical stiffener 114 and the intermediate vertical stiffener 115,
The compressive prestress P1 is formed by embedding the sheath in the longitudinal direction in the end synthetic concrete 112 so that the lower tension member 113 which is a PC steel rod is inserted into the end synthetic concrete 112, the end vertical stiffener 114, 115, and both ends are tensioned and fixed to be introduced into a fixing device provided on the outer side of the end vertical stiffener 114 and the outermost intermediate vertical stiffener 115, respectively. The method according to claim 1,
The center steel beam 120 is an I-beam of steel including an upper flange, an abdomen, and a lower flange, wherein a prestressed steel beam 100 is fixedly installed at both alternating portions to generate a flexural moment, Raman beam structure The end of a steel beam is made of a prestressed steel beam that is released to release the compressive prestress introduced into the concrete. The method according to claim 1,
The upper tension member 117 is fixed after being tensioned between two fixing devices installed on the upper surface of the end steel beam to cancel the flexural members generated in the prestressed steel beams 100 fixed to both the shift portions,
The center steel beams 120 and the end steel beams 110 may be formed to have the same cross section or be connected to each other in a cross sectional shape such that the width of the end steel beams 110 is larger than the center steel beam. A ramen structure constructed using a prestressed steel beam. (a) a both end steel beam 110 comprising a steel beam 111 having a compressive prestress P1 introduced into the lower portion of the neutral axis by a lower tensile member 113 and an end vertical fixture 116 formed on the lower surface; Fabricating a prestressed steel beam (100) comprising a mid-section steel beam (120) connected between the end-to-end composite (110)
(b) pressing the prestressed steel beam 100 between the upper surfaces of the two alternating portions 200 using the end vertical fixing member 116;
(c) disassembling and separating the lower tensile material to release the compressive prestress (P1) introduced into the prestressed steel beam (100); And
(d) introducing a compressive prestress (P2) into the prestressed steel beam (100) by providing an upper prestress (117) to the prestressed steel beams and fixing them after tensioning to form a prestressed steel beam A method of constructing a raymen structure. 8. The method of claim 7,
The prestressed steel beam 100 in step (a) is fabricated by first fabricating a both end steel beam 110 into which a compressive prestress P1 is introduced and by connecting a center steel beam 120 between both ends of the steel composite beam 110 A method of constructing a raymen structure using a prestressed steel beam. 8. The method of claim 7,
The upper tension member 117 of the step (d) may be fixed after being torn by using the lower tension member 113 which has been disassembled and separated in the step (c)
(c), and using a prestressed steel beam that is to be fixed after tensioning using a separate upper taut material than the separated lower taut 113. The method of claim 1, 8. The method of claim 7,
The method of any one of the preceding claims, further comprising: after step (d), placing a concrete on both the upper portions of the alternating section (200) and the prestressed steel beam (100) A method of constructing the manufactured raymen structure.

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