KR0169212B1 - Method of manufacturing and constructing the prestressed composite beam - Google Patents

Abstract

The present invention can overcome the structural and functional defects caused by expansion joints to extend the beam by removing the expansion joint (Expansion Joint) inevitably installed in the construction of the short-span prestressed composite beam structure that has been constructed up to now and In addition, the present invention relates to a method of fabricating a prestressed composite beam and a method of constructing a prestressed composite beam structure that can significantly reduce materials. In addition, the present invention can be manufactured by dividing the composite beam in order to improve the transport and handling difficulties caused when the length of the prestressed composite beam is increased, and for the outer span in the continuous beam structure completed by assembling the divided segments A construction method of continuously integrating a prestressed composite beam for inner span on a point. In order to achieve this purpose, a method of prestressing stress corresponding to the tensile stress generated in the upper flange due to the dead moment in the continuous beam structure due to dead load and live load should be taken. The construction method of the pre-invented prestressed continuous composite beam structure involves a difficult process such as the rise and fall of the point, and the problem of fixed-stage treatment in the manufacturing process. However, the core technology for achieving the objective in the present invention solves the problems caused by the fixed end installation in the manufacturing process and integrates the connection part of the prestress composite interpolation for continuous beams manufactured separately in short span without the difficult process of raising and lowering the branch part It is in Sikkim. Therefore, it is possible to completely eliminate the problems of the expansion joint occurring in the existing prestressed composite beam structure, and to provide a construction method which is high in fatigue fracture strength and seismic resistance and advantageous to deflection. Another object of the present invention is to reduce the maximum bending moment of the span due to the weight and live load significantly compared to the conventional simple beam prestressed composite beam by continuous treatment of the prestressed composite beam manufactured separately in short span, And the introduction of the divided manufacturing method, which is advantageous for handling, to further extend the span length to provide a construction method of a new prestress continuous composite beam structure having an economical and safe cross section.

The fabrication and construction of the prestressed continuous composite beam structure without the process of fabrication of the point rise and the fixed end installation according to the present invention can be further divided into three different methods in terms of function and construction characteristics, one of which is a frist. After fabricating and installing the rest composite beam, the slab and the abdomen of the constant moment section are treated with in-place concrete and the top section of the parent moment section is treated with precast with compressive stress, and the second is the top plate of the constant moment section. Is partly in-cast concrete or factory-produced precast, and the top plate of the parent cement section is treated by precast with prestressed compressive stress. By assembling, we provide the construction method to finish high quality structure in a short time.

Description

Fabrication and Construction Method of Prestressed Continuous Composite Beam Structure without Branch Rise

1 is a shape of the steel beam for the outer span of the prestress continuous composite beam structure according to the present invention and the prestress composite beam having three different functions and construction characteristics.

2 is a principle diagram of a prestressing process of compressive stress for a constant moment section in an outer span beam of a prestressed continuous composite beam structure according to the present invention.

Figure 3 is a principle diagram for the introduction process of the compressive stress for the parent section in the outer span beam of the prestress continuous composite beam structure according to the present invention.

Figure 4 is a shape diagram of the steel beam for the inner span of the prestress continuous composite beam structure according to the present invention and the prestress composite beam having three different functions and construction characteristics.

5 is a principle diagram of the prestressing process of compressive stress in the constant moment section for the inner span of the prestress continuous composite beam structure according to the present invention.

Figure 6 is a principle diagram of the prestressing process of the compressive stress of the parent section in the inner span beam of the prestress continuous composite beam structure according to the present invention.

7 is a prestress for the outer span in the case where the top plate of the constant moment section is completely completed by in-site casting concrete, and the top plate of the parent cement section is completed by precast with compressive stress in the prestress continuous composite beam structure according to the present invention. Connection assembly and finished three-dimensional view of composite beam and prestressed composite beam for inner span.

8 shows the outer span when the top plate of the constant moment section is partially cast by concrete or precast in the prestressed continuous composite beam structure according to the present invention, and the top plate of the parent moment section is completed by the precast introduced with compressive stress. Connection and assembly of completed prestressed composite beam for inner span and prestressed composite beam for inner span.

9 is a connection assembly stereoscopic view of the prestressed composite beam for outer span and prestressed composite beam for inner span when the complete prestressed composite beam structure according to the present invention is completely assembled and completed with a precast top plate.

* Explanation of symbols for main parts of the drawings

1: Positive moment section of steel beam for outer span

2: parent section of steel beam for outer span

3: Auxiliary steel beam for fixing the introduction of compressive stress in the parent section

4: Static moment section of steel beam for inner span

5: parent section of steel beams for inner span

6: connection part of steel beam

7: Lateral steel beam connecting outer span prestressed composite beam and inner span prestressed composite beam

8: Where filled with expansion concrete between the connection part of the outer span prestressed composite beam and the inner span prestressed composite beam

9: precast top plate with compressive stress

The present invention can overcome the structural and functional defects caused by expansion joints and extend the beam by removing the expansion joint (Expansion Joint) inevitably installed in the construction of the short-span prestressed composite beam structure that has been constructed so far, In addition, the present invention relates to a method of fabricating a prestressed composite beam structure and a construction method of the prestressed composite beam structure, which can greatly reduce materials, eliminate the process of raising and lowering the point, and solve the manufacturing problems of the fixed end. In addition, the present invention can be manufactured by dividing the composite beam in order to improve the transport and handling difficulties caused when the length of the prestressed composite beam is increased, and the outer span for the inner beam and the inside of the continuous beam structure completed by assembling the segment A construction method of continuously integrating a prestressed composite beam for side spans on a point. In addition, the present invention can be classified in three different ways in each of the three functional and construction characteristics in detail, one of which is the pre-stressed composite beam after the installation of the slab of the constant moment section as a whole cast or The construction method which handles by precast manufactured in the factory and the parent section is prestressed precast and the second part is that the top plate of the static moment section is partially cast in place of concrete or factory produced Furnace and parent section section is a construction method to process with precast introduced compressive stress, and thirdly, prefabrication of top plate is factory-produced to easily assemble in the field to provide high quality structure in a short time. It is.

The method according to the present invention provides an economical prestressed composite beam structure that can significantly reduce the material by maximizing the introduction of the material properties and compression stress of the steel and concrete. The simple beam prestressed composite beams that have been constructed so far are manufactured by placing concrete on the lower flange of the I-beam and curing it after applying the stress to the given I-beam by the camber. After installation in the field, and the concrete of the upper plate and the abdomen relates to a method of manufacturing a prestressed composite beam (Prestressed Composite Beam). The conventional prestressed composite beam has great advantages in terms of construction speed, reduction of mold height, material saving, and improvement of fatigue strength.

However, in the case of long structures that cannot be processed in a short span because it is a simple beam, the prestressed composite beam made of a simple beam must be connected and installed continuously. In this case, the connection part is treated with an expansion joint. In the case of bridges, such expansion joints are expensive, reduce driving comfort, and require maintenance costs. In addition, the deterioration of the bridge is promoted due to the impact on the expansion joint portion and the resulting leakage during the passage of the vehicle. In the structure made of the existing prestressed composite beams, when integrating the connection part, the expansion joint was inevitably used in spite of the above-mentioned problems because the solution for the parent moment generated at the inner branch part was not found due to its own weight and external force. There was no.

However, in the case of an integrated continuous beam structure, unlike the case where the connection between the beam and the beam is treated with expansion joints, as in the conventional prestressed composite beam, tensile stress is generated in the upper flange of the inner branch portion due to the parent load caused by the dead load and the live load. Done. Prestressing compressive stress (Prestressing) method corresponding to the tensile stress was not considered in the manufacturing method of the existing prestressed composite beam. In addition, the construction method of the pre-invented prestress continuous composite beam structure includes a difficult process, such as the rise and fall of the point, and the problem of fixed-stage treatment in the manufacturing process. The main object of the present invention is to integrate the connection part of the continuous beam prestressed composite interpolator manufactured by separating the short beams without the fixed end in the manufacturing process without the process of raising and lowering the point. Therefore, it completely eliminates the problems of the expansion joint generated in the existing prestressed composite beam structure, and provides a construction method that is high in fatigue fracture strength and shock resistance and advantageous to deflection. Still another object of the present invention is to reduce the maximum bending moment in the span due to the self-weight and live load by the continuous processing of the prestressed composite beams produced by the short span significantly than the conventional simple beam prestressed composite beams, In addition, the introduction of the segmentation manufacturing method, which is advantageous in handling, makes the span section longer, thereby providing a construction method of a new prestress continuous composite beam structure having an economical and safe cross section.

The fabrication and construction method of the new prestressed composite beam for continuous beam structure, which eliminates the point rise process and does not require the installation of fixed ends in the manufacturing process, will be described with reference to the drawings.

FIG. 1 shows a steel beam for lateral span and a prestressed composite beam having three different functions and construction characteristics in a prestressed continuous composite beam structure. Fig. 1 (a) is a steel beam having a peak at a position of about 3 / 8ℓ where the maximum deflection curve occurs when the deflection curve due to the dead load is roughly inverted when the continuous beam structure is completed. It has a connection part 6 which can be engaged and disassembled in the place which becomes roughly zero. Here, the left member 1 is a constant moment section and the right member 2 is a parent moment section. In the constant moment section, after the continuous beam structure is completed, tensile stress is generated in the lower part of the beam, and tensile stress is generated in the upper part of the beam in the parent moment section. Therefore, the technical core of the present invention is that when the structure is completed by prestressing the pre-stressing in the concrete material of the section where the tensile stress is generated in the continuous structure, that is, the lower portion of the constant moment section beam and the upper part of the parent section section beam By canceling the tensile stress generated, the resistance of the continuous composite beam structure due to external force is greatly increased. In (b) of FIG. 1, the top plate and the concrete of the abdominal section are completely cast in place, and the top concrete of the parent section is a prestressed composite beam that is completed by precast with compressive stress. Fig. 1 (c) shows the prestressed composite beam when the top concrete of the constant moment section is completed by partial cast-in-place concrete or factory-produced precast, and the top plate of the parent section by precast with compressive stress. Indicates. (D) of FIG. 1 is similar to that of (c) of FIG. 1, and a protrusion and a shear key are provided on the upper portion of the beam so that the precast top plate can be assembled. The fabrication process of the prestressed composite beam for continuous beam structure having three functions and construction characteristics shown in (a), (b), and (c) of FIG. 1 will be described in detail with reference to FIG. 2 and FIG. Same as

FIG. 2 shows a process of prestressing the compressive stress in the concrete placed in the lower flange of the steel beam of the constant moment section (1) shown in FIG. (A) of FIG. 2 shows the shape of the steel beam of the constant moment section 1 (about 2/3 of the total beam length L) in which the bending curve by external force is reversed in the outer beam of the continuous beam structure. Here, the shape of the bending curve of the steel beam may vary slightly depending on the actual situation that can occur during the manufacturing process.

2 (b) shows the compressive stress by placing concrete on the lower flange of steel beam with two loads P which can introduce necessary compressive stress at the position of about 0.125ℓ from both ends of the static moment section beam. It is a production principle showing the appearance of introduction.

The manufacturing process of FIG. 2 (b) is related to the principle, and in actual production, two steel beams are installed symmetrically and loaded at both ends of the beam with the point installed at the point of load P. Prestressed composite bonded segments of two constant moment sections can be produced. (C) of FIG. 2 shows a state in which the load P is removed after the concrete poured on the lower flange of the steel is cured. Through this process, the concrete placed on the lower flange is prestressed to compensate for the tensile stress generated when the structure is completed. (C) of FIG. 2 shows a case where the abdomen and the upper plate of the beam are completed by in-situ concrete after installation as a continuous beam structure. The thus prepared prestressed composite beam segment becomes a component of the static moment section of the completed prestressed composite beam of FIG. 1 (b). (D) of FIG. 2 is a prestressed composite beam for continuous beams having a slightly different function from that of FIG. 2c before the installation of continuous beam structures in order to reduce the hassle caused by concrete placing on site. The case where concrete is poured into the abdomen and the upper part of the beam in the state of is shown. In this case, the hassle of concrete pouring is reduced, but the handling difficulties due to the increase in weight may be a disadvantage. The prepared prestressed composite beam segment has the components of the constant moment section of the completed prestressed composite beam of FIG. (E) of FIG. 2 is another construction method of (c) and (d) of FIG. 2, which has a protrusion and a shear key so that the upper plate can be combined with the upper plate, and a reinforcing plate is attached to the upper flange of the steel. This is because the width of the lower flange of the steel beam is larger than the width of the upper flange to balance the top and bottom flange cross-sectional area. The prestressed composite beam segment thus fabricated becomes a component of the static moment section of the completed prestressed composite beam of FIG. In this case, the top plate or precast is manufactured to provide a method of installing the top plate between the beam and the beam and filling the shear key with expansion concrete to integrate the beam and the top plate. The advantage of this method is that it does not need concrete casting of abdomen and top plate on site and can be installed quickly, but the precision construction method that the size of beam and top plate should be precisely manufactured should be guaranteed (see Fig. 9).

3 shows the principle of the prestressing of the compressive stress in the parent section of the outer span beam in the prestressed continuous composite beam structure nothing. (A) of FIG. 3 shows two members of the parental section having a phenomenon in which the bending curve by the external force is inverted after the continuous beam structure is completed in the outer beam. In this figure, a point is provided at the connecting part and a load P is loaded at both ends of the member of the parent section to introduce the necessary compressive stress. Here, the bending curve shape of the steel beam may vary slightly depending on the actual situation that may occur in the manufacturing process, and the third (3) is temporarily necessary for the introduction of the compressive stress, and the member is not necessary for the continuous beam structure. no. In actual production, the two beams shown in Fig. 3 (a) are symmetrically arranged to produce prestressed composite beam segments of four parent cement sections at once. In the loading state as shown in FIG. 3 (a), tensile stress is generated at the upper end of the steel beam, and the largest tensile force is generated at the point portion. (B) of FIG. 3 shows a state in which concrete is poured on the upper flange while the load P is loaded. FIG. 3 (c) shows a state in which the beam of the parent section 2 is separated by removing the load P after the concrete poured on the upper flange is cured. Through this process, the concrete placed on the upper flange is prestressed to compensate for the tensile stress generated when the continuous beam structure is completed.

Since the prestressed composite beam segments of the parent cement section manufactured as shown in FIG. 3 (c) have no problem in transportation and handling due to the relatively short length of the beam, the abdomen and upper flange of the beam as shown in (d) of FIG. Place concrete in advance. Therefore, it is possible to reduce the cumbersome work of on-site concrete pouring after installation with continuous beam structure. The prestressed composite beam segment of the completed parent section is combined with the prestressed composite beam segment of FIG. 2 (c) and the abdomen and top plate of the beam of the constant moment section in the continuous process of continuous beam structure as shown in (b) of FIG. The whole is made of in-place concrete and the parent section is formed of a prestressed composite beam for complete lateral span when the compressive stress is completed by precast. Also, (d) of FIG. 3 is combined with (d) of FIG. 2 to partially cover the top plate of the constant moment section in situ concrete or precast in the process of sequencing the prestress beam as shown in (c) of FIG. The cement section is formed of a prestressed composite beam for the complete outer span when the compressive stress is completed by the precast introduced. Also, in the process of FIG. 3 (b), as in FIG. 2 (e), the concrete having the projecting portion and the shear key is formed on the upper part of the beam so that the concrete placed on the upper flange can be combined with the upper plate as shown in (e) of FIG. The prestressed composite beam for the outer span of the prestressed continuous composite beam structure, which can be fabricated in cross section and combined with (e) of FIG. 2, can be fabricated and prefabricated as the upper plate as shown in (d) of FIG.

FIG. 4 shows the steel beams for inner span of prestressed continuous composite beam structures and the finished prestressed composite beams having different functions and construction characteristics, as in FIG. 1. FIG. 4 (a) shows continuous beam structures. As the steel beam for the inner span of steel structure, when the structure is completed, the deflection curve by the external force is inverted, and the moment indicating the state with the peak at the center of the steel beam is easy to be combined and disassembled The connection part 6 is provided. Here, the shape of the bending curve of steel beams may vary slightly depending on the actual situation of the manufacturing process, and about 0.2ℓ of the length of the inner span beam ℓ from the left and right ends is generated by the weight of the parent when the continuous beam structure is formed. (5) and the center portion 0.6ℓ is the constant moment generating section (4). The parent section (5) located at both ends of (b) of FIG. 4 has a compressive stress introduced in the upper part of the beam, and the entire beam is placed in concrete, and the constant moment section (4) is placed in the concrete of the lower flange. As in the case of (b) of FIG. 1, when the compressive stress is introduced, the slab and the abdominal concrete are completed by site casting after installation with continuous beam structures. The difference between (c) of FIG. 4 and (b) of FIG. 4 is that the concrete is placed in a part of the upper plate of the constant moment section 4 and the abdomen, and thus, as in the case of FIG. It has the advantage of reducing the concrete placing work on the top and abdomen during the construction process. (D) of FIG. 4 is a prestressed composite beam in which protrusions and shear keys are formed on the upper portion of the beam to assemble the precast top plate manufactured in the same manner as in the case of FIG. FIG. 5 shows the manufacturing process of the constant moment segment segment 4 of the inner span beam of the prestressed composite beam for continuous beams having three different functions and construction characteristics shown in FIG. (A) of FIG. 5 shows the shape of the segment beam of the constant moment section of the inner span steel plate, and (b) of FIG. 5 cancels the tensile stress generated in the lower part of the constant moment section beam when the continuous beam structure is completed. This is a principle diagram of the prestressing process of the compressive stress in the lower flange concrete of the beam. In this process, concrete is placed in the lower flange of the steel beam with two loads, P, which can introduce the necessary compressive stress at a distance of about 0.2 L from the center of the beam. In actual production, as mentioned in the manufacturing process of FIG. 2 (b), two prestressed bonded segments can be manufactured at one time. (C) of FIG. 5 shows a state in which the compressive stress is introduced to the concrete placed on the lower flange of the steel beam by removing the load P after the concrete is cured in the process of FIG. 5 (b). The completed prestressed composite beam segment becomes a component of the static moment section of the finished prestressed composite beam as shown in FIG. 4 (b). (D) of FIG. 5 shows a state in which the abdomen and the upper part of the beam of the inner segment of the constant moment section for inner span shown in (c) of FIG. 5 are placed in concrete to reduce the hassle of concrete placing after installation as a continuous beam structure. It is shown. The prestressed composite segment shown in (d) of FIG. 5 becomes a component of the static moment section of the completed prestressed composite beam as shown in (c) of FIG. (E) of FIG. 5 is the same as that of (e) of FIG. 5, where the precast produced at the factory can be assembled in order to omit the concrete laying work on the site after installation as a continuous beam structure. The prestress composite beam segment shown in the above procedure has the upper projection and shear key and the reinforcement plate is added to the upper flange of the steel. The prestressed composite beam segment shown in (e) of FIG. 5 becomes a component of the static moment section of the finished prestressed composite beam for the continuous continuous beam as shown in (d) of FIG. 6 is almost the same as the prestressing process of the compressive stress of the parent cement section of the outer beam prestressed composite beam in the continuous beam structure shown in FIG. It is the principle diagram in the process of introducing the compressive stress in (5), and in actual production, it is possible to manufacture four prestressed bonded cements at one time as mentioned in (a) of FIG. The difference between Fig. 6 (a) and Fig. 3 (a) is that the bending shape of the steel beam and the length of the beam are slightly different as in Figs. 1 (a) and 4 (a). (B), (c), (d), and (e) the manufacturing process and the features of each member shown in FIG. 6 except that there is a slight difference in the bending form and length of the prestressed composite beam. ), (c), (d), and (e). Fig. 7 (a) shows the prestressed composite beam for outer span (figure 1 (b)) and prestressed for inner span when the top plate and abdomen of the constant moment section are completed by cast-in-place concrete in the prestressed continuous composite beam structure. It is a three-dimensional view of the state where the composite beam (FIG. 4 (b)) is coupled by the steel beam 7 provided laterally. The concrete material shown in (a) of FIG. 7 has a compressive stress that can cancel the tensile stresses applied when the continuous beam structure is completed, and the manufacturing process shown in FIGS. 2, 3, 5, and 6 All have been introduced. FIG. 7 (b) shows a state in which the outer span prestressed composite beam and inner span prestressed composite beam shown in FIG. The method of canceling the tensile stress generated in the upper part between the connection of two beams is by intensive reinforcement of the tensile reinforcing bar in the upper part between the connection part 8 and the other method is to introduce the compressive stress by filling with expansion concrete (Prestressing) ) In addition, the top plate of the parent section is provided with a precast 9 into which the compressive stress is introduced, so that the continuous composite beam structure of the first case intended in the present invention is completely established. Through this process, more than three spans of continuous composite beam structure can be completed. (A) of FIG. 8 shows an outer span prestressed composite beam (FIG. 1 (c)) and an inner span prestress when the top plate of the constant moment section is partially completed by cast-in-place concrete in the prestressed continuous composite beam structure. It is a three-dimensional view of the state in which the composite beam (FIG. 4C) is joined by the steel beam 7 provided laterally. For the concrete placed on the lower flange of the constant moment section and the concrete placed on the upper flange of the parent moment section shown in (a) of FIG. 8, the manufacturing process shown in FIG. 2, 3, 5, and 6 The compressive stress is introduced (Prestressin) state that can cancel the tensile stress generated when the continuous beam structure is completed. FIG. 8 (b) shows a state in which the outer prestressed prestressed composite beam and the inner spand prestressed composite beam are continuously completely combined and completed. The tensile stress generated at the upper part between the connection parts of the two beams can be canceled by the concentrated reinforcement of the reinforcing bar and the introduction of the compressive stress by filling the expanded concrete as in the case of FIG. 7 at the upper part between the connection parts 8. In addition, the correlation between the parent cement section is the same as in the case of FIG. 7 by installing the precast 9 produced by introducing the compressive stress in the factory, the continuous composite structure of the second case intended in the present invention is completely established. Here, the top plate of the constant moment section can also be installed using a precast manufactured at the factory. In this case, the connection part between the beam and the upper plate or between the upper plates is filled with expanded concrete, thereby preventing cracks due to dry shrinkage. (A) of FIG. 9 is a prestressed composite beam for inner span in a prestressed continuous composite beam structure in which a projecting part and a shear key are formed on the upper part of the beam so that the precast top plate produced in the factory can be assembled in the field (FIG. 1 (d)). ) And an external span prestressed composite beam (FIG. 4 (d)) is a three-dimensional view of the combined state using the steel beam (7) provided laterally. (B) of FIG. 9 shows the concentrated reinforcement of tensile reinforcing bars as in the case of FIG. 7 in the upper part of the connection between the two beams (8) of the three-dimensionally arranged beams in the continuous composite beam structure of FIG. By or by filling with expanded concrete it is possible to introduce compressive stress (Prestressing), and thus to offset the tensile stress generated on top of the connection when the continuous composite structure is completed. As in the case of Figs. 7 and 8, the precast upper plate 9 installed in the parent section should have a compressive stress introduced, and the joints and shear keys between the beam and the upper plate or upper plates are filled with expansion concrete, so No cracks and gaps occur.

In all the above processes, the concrete placed on the upper flange should expose the necessary reinforcing bars to the left and right so as to be integrated with the upper and lower plates. However, in the drawing, the exposed rebar is omitted.

Claims (9)

In the fabrication and construction of the prestressed continuous composite beam structure, when the continuous composite beam structure is completed, the deflection curve due to the external force is roughly reversed, and the peak has a peak at the position of about 3 / 8ℓ of the beam length (ℓ) from the left side of the beam. When the steel beams for lateral span and the steel beam structures for inner span with the vertices in the center of the beam are completed, the moments (1), (4) and the parent are respectively bounded by the point where the moment is approximately zero under dead load. In order to offset the tensile stress generated during the completion of the continuous beam structure after split fabrication into sections (2) and (5), it is possible to introduce the compressive stress required for the lower flange of the beam by mounting it with a simple beam system in the constant moment section. Placing and curing concrete in the lower flange under the application of two concentrated loads P. In particular, in the parent cement section, two segment members and In particular, in the parent section, the load P that connects the two segment members 2 and 5 in the parent section to the left and right of the third member 3 and introduces the necessary compressive stress after installing the points at both ends of the third member 3 After adding and curing the concrete to the upper flange with the first and the end of the parent section, the stiffening beam for outer span prestressed composite beam for inner span and prestressed composite beam for inner span are combined. After installation as a structure, the upper plate placed in the bow is precast (9) in which compressive stress is introduced in the parent moment section, and the upper plate in the constant moment section is integrally joined by cast-in-place concrete or factory-made precast and used for outer span. The upper part between the prestressed composite beam and the connection part 8 of the prestressed composite beam for inner span is used for filling the expanded concrete. To manufacture and construction method of the prestressed continuous composite beam structure, characterized in that to complete. The method according to claim 1, wherein the prestressing of the reinforcing bar by the concentrated reinforcement of the reinforcing bar is performed to offset the tensile stress due to the parent moment generated during the completion of the continuous beam structure. Method for fabricating and constructing a prestress continuous composite beam structure characterized in that. The method of claim 1, wherein the deflection curve due to the external force is roughly inverted when the continuous composite beam structure is completed in the outer span of the prestress continuous composite beam structure, and is peaked at about 3/8 L position from the left side of the beam. Fabrication of continuous prestressed composite beam structure, characterized in that the outer prestressed composite beam having a state of having a separated state into a constant moment section (~ 0.75ℓ) (1) and a segment (~ 0.25ℓ) (2) Construction method. The method of claim 1, wherein when the continuous composite beam structure is completed in the inner span of the prestressed continuous composite beam structure, the deflection curve due to external force is roughly reversed, and the prestressed composite beam for inner span having a vertex in the center of the beam is defined. A method of fabricating and constructing a prestressed continuous composite beam structure, characterized in that the cement section (about 0.6ℓ of length) (4) and the segment (~ 0.2ℓ) (5) of the parent section. According to claim 1, When the prestress continuous composite beam structure is completed, the tensile stress generated during the completion of the structure in the constant moment section of the outer prestress composite beam and the inner prestress composite beam segment in which the deflection curve by the external force is inverted roughly Compression stress on concrete placed on the lower flange by placing and curing concrete on the lower flange under the application of two concentrated loads P, which can be mounted on a simple beam system to introduce the necessary compressive stress on the upper part of the beam. Method of fabricating and constructing a prestress continuous composite beam structure, characterized in that the introduction (Prestressin). According to claim 1, wherein the two segment members (2, 5) of the parent cement kuna are connected to the left and right of the third member (3), and after the point search at both ends of the third member (3), The compressive stress that can offset the tensile stress caused by the parent moment generated during the completion of the continuous beam structure by placing and curing concrete on the upper flange while applying the load (P) to introduce the necessary compressive stress at the end and the end. Method for producing and constructing a prestress continuous composite beam structure, characterized in that the introduction. The prestressed continuous composite beam structure according to claim 1 or 2, wherein the top plate of the parent section is completed by using the precast 9 into which the compressive stress is introduced by the compressive stress introduction method. Method of construction and construction. The prestress continuous composite beam structure according to claim 1 or 2, wherein the prestress continuous composite beam structure is completed by using the precast fabricated at the site in part by using the cast-in-place concrete or the factory in part of the top moment section. Method of construction and construction. The method according to claim 1 or 2, wherein the production of the prestress continuous composite beam structure, characterized in that the installation of the protrusion and the shear key on the upper portion of the prestress continuous composite beam to be assembled and assembled with the top plate precast produced in the factory and Construction method.